JP4813287B2 - Reconstruction promotion method and equipment for existing buried pipes - Google Patents

Description

  The present invention relates to a reconstruction promotion method for renewing an existing buried pipe to a new buried pipe while crushing an existing buried pipe, and in particular, the reconstruction promotion performed under the condition that the updated pipe is eccentric from the center of the existing buried pipe. The present invention relates to a construction method and an apparatus for performing this construction method.

Since buried pipes buried in the ground as lifelines for water and sewage, gas, etc. are aged over time, buried pipes that exceed the service life need to be replaced with new pipes in a timely manner.
In order to renew such an existing buried pipe, in the old days, the buried pipe was excavated by excavating the buried portion, and a new pipe was buried again. Recently, a reconstruction promotion method has been developed in which existing pipes are crushed and new pipes are pushed at the same time without cutting.

Therefore, with reference to FIG. 6, a conventional reconstruction promotion construction method will be described.
FIG. 6 shows an existing sewer system to be renovated. In FIG. 6, reference numeral 10 indicates a manhole, and 12 indicates a buried pipe used as a sewer pipe.

  In order to newly renew the buried pipe 12 that has been built for more than 50 years and has deteriorated, as shown in FIG. 6, a starter 14 for propelling the renewed pipe 13 is excavated, and this starter 14 The propulsion device 15 is installed in

  The propulsion unit 15 is a propulsion unit used in a buried pipe propulsion method using a non-opening method. In this propulsion device 15, a cutter head 17 for crushing the buried pipe 12 is attached to the tip of the scree 16, and the buried pipe 12 is crushed with the cutter of the cutter head 17, and fragments and earth and sand are removed by the screw 16. It is transferred to the start counter 14.

  Simultaneously with the crushing of the buried pipe 12, the propulsion device 15 applies a driving force to the new update pipe 13 and pushes the update pipe 13 by the length of the crushed buried pipe 12. By proceeding in this way, the buried pipe 12 can be replaced with the update pipe 13.

  In such a conventional remodeling promotion method, the buried pipe 12 and the renewal pipe 13 need to be aligned with each other. If the renewal pipe 13 is displaced from the axis of the buried pipe 12, the whole buried pipe 12 cannot be crushed by the cutter head 17, and the propulsion direction of the renewed pipe 13 is not stable.

  Therefore, in the case where a deviation occurs in the propulsion direction of the update pipe, a plurality of direction correcting cylinders 18 are provided at equal intervals in the circumferential direction so that the direction of the cutter head 17 can be adjusted. The propulsion direction can be corrected by detecting the shift in the propulsion direction, operating the direction correcting cylinder 18 at a position corresponding to the deviated direction, and tilting the cutter head 17.

In addition to using the direction correcting cylinder 18, a technique has been proposed in which the cutter head is guided by guide means that moves inside the existing buried pipe prior to the cutter head (Patent Document 1, 2).
Japanese Patent Laid-Open No. 9-25787 JP 2000-257374 A

The conventional reconstruction promotion method has been implemented on the assumption that the shaft centers of the buried pipe 12 and the renewal pipe 13 coincide.
However, recently, it has emerged as a new technical problem that the renewal pipe is decentered and propelled with respect to the axis of the buried pipe 12.

  For example, in the sewerage plan, the burial depth of the sewer pipe may be changed during a basic review of the pipeline design. If it does so, since a difference will arise in the height between an existing buried pipe and an update pipe, the conventional reconstruction promotion construction method has become obstacles.

  That is, when the eccentric amount of the renewal pipe with respect to the buried pipe increases, there is a problem that the operating range of the guide means that moves inside the buried pipe prior to the cutter head is exceeded, and the guide means cannot be used.

  In addition, since a part of the buried pipe is crushed, the load on the cutter head varies greatly. For this reason, the cutter head tends to escape in a direction with a light load. In order to prevent this, the work of filling the backfill material into the buried pipe must be performed in parallel with the propulsion work, and the work efficiency is greatly reduced.

  Therefore, the object of the present invention is to solve the problems of the prior art, when the pipeline design is reviewed in the renovation plan such as sewer, and the depth and position of the buried pipe and the updated pipe are different in eccentricity. In addition, the present invention is to provide a method for promoting the reconstruction of existing buried pipes, in which the direction of propulsion of the renewed pipes is stably corrected so that efficient reconstruction work can be performed.

  In order to achieve the above-mentioned object, the present invention uses the propulsion unit to break the existing buried pipe buried in the ground with the cutter head of the propulsion unit and simultaneously use the renewed pipe with the leading pipe to be preceded. And a method of excavating a start pit from the ground surface at the start end position of the buried pipe, and installing the propulsion device in the starting position, and a guide preceding the pre-conduit using the buried pipe as a guide travel path Placing the device into the pipe of the buried pipe, positioning the propulsion unit with the position where the leading conduit is eccentric from the axis of the buried pipe and partially overlapping the buried pipe as a propulsion position, and A step of connecting the guide device and the tip conduit with an eccentric support arm, and pushing the tip conduit with the propulsion unit while crushing a part of the buried tube with a cutter head of the propulsion unit, and guiding the buried tube with a guide travel path And during crushing While using the receiving force by the prior moving the guiding device, a step of promoting the update pipe with said destination conduit and is characterized in that it consists of.

  Further, the present invention is an apparatus for propelling a new renewal pipe using a propulsion unit together with a leading pipe to be preceded while crushing an existing buried pipe buried in the ground with a propulsion unit, And a propeller main body to which a screw accommodated in the casing is coaxially connected to the renewal pipe, a front conduit connected to the front end of the renewal pipe, and attached to the front end of the front duct and rotated from the screw A cutter head to which torque is transmitted, a guide device that is movably inserted into the pipe of the buried pipe, moves as the guide pipe as a guide travel path, and connects the guide device and the leading conduit, An eccentric support arm that supports the leading conduit by receiving the reaction force of the buried pipe via the guide device at a position that is eccentric from the shaft center and partially overlaps the buried pipe. Is a thing

  According to the present invention, the pipe design is reviewed in the renovation plan of the sewer, etc., and even if the depth and position of the buried pipe and the renewed pipe are different, the buried pipe can be obtained by preceding the guide device. Can be used as a guide travel path and a reaction force receiver, and the propulsion direction of the renewal pipe can be corrected stably and efficient renovation work can be performed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a buried pipe reforming method and apparatus according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a propulsion device for carrying out the reconstruction promotion method for buried pipes according to the present embodiment. In FIG. 1, reference numeral 20 indicates the entire propulsion device. As this propulsion unit 20, a known propulsion unit widely used in a construction method for propelling a buried pipe into the ground without being cut is used. Reference numeral 12 denotes an existing buried pipe that is aged and is rebuilt to the update pipe 30 using the propulsion device 20. In this embodiment, the buried pipe 12 is a fume used for a sewer pipe. A vertical shaft 14 (hereinafter referred to as a start shaft) is excavated at the start position of the buried pipe 10, and the propulsion device 20 is carried into the start shaft 11.

  In the propulsion device 20, a propulsion device main body 22 is movably installed on a guide frame 21 serving as a base. On both the left and right sides of the propulsion unit main body 22, hydraulic cylinders 23 that generate thrust for pushing the update pipe 30 are disposed. The tip of the piston rod of the hydraulic cylinder 23 is fixed to the reaction force receiver 24. The propulsion device main body 22 includes a hydraulic motor 25 that generates torque.

  The following attachments are used for the propulsion device main body 22. This attachment includes a screw 16 having a spirally extending blade in the axial direction, a cutter head 17 attached to the tip of the screw 16, an update pipe 30, and a leading conduit 32.

  The screw 16 is accommodated coaxially in the casing 19 inside the renewal pipe 30, and the driving torque of the hydraulic motor 25 is transmitted to the screw 16 via a hollow speed reducer (not shown). At the same time, thrust generated in the hydraulic cylinder 23 from the propulsion device 10 is applied to the update pipe 30. The renewal pipe 30 and the screw 16 perform the propulsion work while adding one by one as the propulsion is extended.

A leading conduit 32 is connected to the tip of the renewal tube 30. A cutter head 17 is attached to the tip of the leading conduit 32.
The cutter head 17 has a disk-shaped face plate 33 constituting a head body, and a plurality of cutters 34 are arranged on the face plate 33 along the diameter. Inside the cutter head 17, the tip end portion of the screw 16 and the face plate 33 are rotatably supported via a bearing support portion 39. The rotational torque of the screw 16 is transmitted to the face plate 33, the face plate 33 rotates, and the broken pieces of the pipe described by the cutter 34 and the excavated earth and sand are screwed from the discharge port (not shown) opened in the face plate 33. 16 is introduced.

  Such a cutter head 17 is swingably connected to the tip of the leading conduit 32. In the leading conduit 32, direction correcting cylinders 35 for adjusting the propulsion direction when the deviating from a predetermined propulsion direction are incorporated in two upper and lower portions. The direction correcting cylinder 35 swings the cutter head 17 in a direction to eliminate the positional deviation amount in accordance with the positional deviation amount of the tip of the leading conduit 32.

  In FIG. 1, a laser target 36 is disposed at the tip of the leading conduit 32, and a laser is irradiated toward the laser target 36 from a laser theodolite 37 disposed on the propulsion device 20 side. A deviation in the propulsion direction of the leading conduit 32 can be detected from the deviation of the laser beam at the laser target 36.

  Next, in FIG. 1, reference numeral 40 indicates a guidance device. The guide device 40 is movably inserted into the pipe of the buried pipe 12 and moves along the buried pipe 12 as a guide travel path along with the propulsion of the leading pipe 32 to guide the propulsion of the leading pipe 32.

  FIG. 2 is a plan view showing the guide device 40. The guide device 40 includes a cylindrical main body frame 41, and an elongated plate-like sliding member 41a extending parallel to the axial direction is attached to the main body frame 41 symmetrically with respect to a plurality of axes. The guide device 40 can slide on the inner peripheral surface of the buried pipe 12 via a sliding member 41a.

As shown in FIG. 1, the guide device 40 is connected to the leading conduit 32 by an eccentric support arm 42. In this embodiment, it is planned that the renewal pipe 30 is propelled in parallel at a position eccentric to the lower side of the buried pipe 12, and the leading pipe 32 is eccentric from the axis of the buried pipe 12 as shown in FIG. 3. And it is supported by the eccentric support arm 42 so that it may be in the position which overlaps with the buried pipe 12 partially.
In FIG. 1, such an eccentric support arm 42 has the following structure in order to support the leading conduit 32 by receiving the embedded tube 12 as a reaction force via the guide device 40 as will be described later.

  A connecting portion 43 between the eccentric support arm 42 and the tip conduit 32 is fixed to the outer peripheral surface of the tip conduit 32. The connecting portion 43 has a middle and high hollow box structure with the upper surface curved and projecting, and sufficient strength is ensured. The connecting portion 43 is installed behind the connecting portion between the cutter head 17 and the leading conduit 32. The eccentric support arm 42 has a middle-high elongated hollow box structure, and extends in parallel so as to protrude from the connecting portion 43 along the outer peripheral surface of the leading conduit 32 and the cutter head 17.

  In the guide device 40, the link arm 44 is swingably supported via the support shaft 45. The link arm 44 adjusts the relative eccentric position of the leading conduit 32 with respect to the buried pipe 12. The distal end of the link arm 44 is coupled to the distal end of the eccentric support arm 42 via a coupling pin 46. On the other hand, the rear end of the link arm 44 is connected to the piston rod of the direction correction auxiliary cylinder 48 via a pin 47. The direction correcting auxiliary cylinder 48 is a cylinder for swinging the link arm 44 to assist in correcting the direction of the leading conduit 32, and is supported by a bracket 49 attached to the front end of the guide device 40 so as to be swingable. ing.

  Next, the process of promoting the renewal pipe 30 to a position eccentric to the lower side of the aged buried pipe 12 and remodeling the sewer will be described step by step.

  First, as shown in FIG. 4, a start pit 14 is excavated at the start position of the buried pipe 12. The propulsion device 20 is installed in the start pit 14. In this case, since there is an existing manhole 10 at the end position of the buried pipe 12, this manhole 10 is used as an arrival resistance.

  Next, as shown in FIG. 5, the guide device 40 is put into the buried pipe 12 from the starting resistor 11. The leading conduit 32 to which the cutter head 17 is attached is connected to the propulsion device 20 in advance. Since the leading conduit 32 is propelled downward by a predetermined distance from the axis of the buried pipe 12, the leading conduit 32 is eccentric from the axis of the buried pipe 12 and partially overlaps the buried pipe 12. The propulsion device 20 is positioned while adjusting the height of the propulsion device 20 and the position in the left-right direction so as to be in the position. Thereafter, the guide device 40 placed in the buried pipe 20 and the leading conduit 32 are connected by the eccentric support arm 42.

Thus, when preparation for propulsion is completed, the cutter head 17 is rotated by the propulsion unit 20, and the piston rod is extended from the hydraulic cylinder 23 of the propulsion unit 20 while the lower part of the buried pipe 12 is crushed by the cutter 34, thereby leading the pipe 32. Push in. Each time propulsion of the leading conduit 32 is extended, the leading conduit 32 is propelled without being added.
In FIG. 1, the renewal pipe 30 is continuously added to the last leading pipe 32, and thereafter, the renewal pipe 30 is similarly promoted while being added. In the process of propelling the update pipe 30, the guide device 40 moves through the buried pipe 12 in advance of the leading conduit 32 and guides the propulsion of the leading conduit 32. In this case, since the existing buried pipe 12 can be used for the guide travel path, the propulsion direction of the leading conduit 32 can be matched with the direction of the buried pipe 12.

  Further, in the case of the old buried pipe 12, the buried pipe 12 is often laid by the open-cut method, and the buried pipe 12 may be placed on the sleepers 62 arranged side by side. In this case, when the buried pipe 12 is crushed by the cutter head 17, the sleepers 62 are also crushed together. However, some of the sleepers 62 are made of concrete, and the resistance when crushing is large and the fluctuation of the resistance is large, and the cutter head 17 is shaken by the resistance, and stable crushing cannot be performed.

  On the other hand, in this embodiment, since the guide device 40 moves the embedded tube 12, the guide device 40 is brought into contact with the inner peripheral surface of the embedded tube 12, that is, the embedded tube 12 is received as a reaction force to support eccentricity. Since the tip conduit 32 can be supported in a stable posture by the arm 42, even if there is a concrete sleeper 62, it can be stably crushed.

  In this way, whether or not the propulsion direction of the leading conduit 32 coincides with the preset propulsion direction as appropriate even during stable propulsion using the buried pipe 12 as a reaction force receiver. Is appropriately measured by irradiating the laser target 36 with laser light from the laser theodolite 37.

  If it is found as a result of the measurement that there is a deviation in the propelling direction of the leading conduit 32, the direction / posture of the cutter head 17 in the direction to eliminate the positional deviation amount by operating the direction correcting cylinder 35 as follows. To adjust the propulsion direction.

  For example, when the propulsion direction of the leading conduit 32 is shifted downward, by extending the piston rod of the direction correcting cylinder 35 disposed below and pulling in the piston rod of the direction correcting cylinder 35 disposed above, The cutter head 17 may be tilted upward. If the propulsion direction is shifted upward, the operation is reversed.

  When such a direction correction is performed, resistance accompanying the direction correction is generated. However, in the same manner as described above, the embedded pipe 12 is used as a reaction force receiver and the tip support 32 is supported by the eccentric support arm 42. Therefore, stable direction correction can be performed.

  Moreover, according to the present embodiment, since the guide device 40 is provided with the direction correction auxiliary cylinder 48, the direction of the buried pipe 12 when the direction is corrected in cooperation with the direction correction cylinder 35 provided in the front conduit 32. Therefore, the support posture of the tip conduit 32 by the eccentric support arm 42 can be corrected. For example, when the propulsion direction is shifted downward, the cutter head 17 is pulled up by the direction correcting cylinder 35 and the piston rod of the direction correcting auxiliary cylinder 48 is pulled in to lift the eccentric support arm 42. . Since the cutter head 17 is heavy, especially when the ground is soft, the tip conduit 32 tends to sink due to the weight of the cutter head 17, and even if it is corrected, it may not be effective. Even in such a situation, by cooperating the direction correction cylinder 35 and the direction correction auxiliary cylinder 48, it is possible to assist the direction correction of the leading conduit 32 and perform the direction correction operation more stably and accurately. Become.

  When the guide device 40 moves to the tip side of the buried pipe 12, it is taken out from the manhole 10 side and then collected on the ground surface. Further, when the buried pipe 12 is crushed to the end with the cutter head 17, it is removed to the cutter head 17 and the manhole 60 side and collected. Hereinafter, since the renewal pipe 30 is not continuously promoted, the leading conduit 32 is collected, and is promoted until the renewal pipe 30 reaches the manhole 60 side.

  As mentioned above, although the preferred embodiment was given and demonstrated about the reconstruction promotion construction method of the buried pipe which concerns on this invention, the construction method which concerns on this invention is eccentric not only when it deviates downward with respect to a buried pipe but in the left-right direction. In this case, it can be applied in the same manner.

The side view which shows the propulsion machine which implements the reconstruction promotion construction method of the buried pipe by this invention. The top view which shows the guide apparatus used for the reconstruction promotion construction method of the buried pipe. The figure which shows the positional relationship of the buried pipe and the tip pipe which became aged in the reconstruction promotion method of the buried pipe by this invention. In the reconstruction promotion construction method by embodiment of this invention, the side view which shows the process of installing a propulsion machine in the start-up. In the reconstruction promotion construction method by embodiment of this invention, a side view which shows the process of putting a guide apparatus in a buried pipe and starting a promotion. The figure explaining the conventional reconstruction promotion construction method.

Explanation of symbols

12 buried pipe 17 cutter head 20 propulsion machine 30 renewal pipe 32 tip pipe 35 direction correction cylinder
40 Guide Device 42 Eccentric Support Arm 44 Link Arm 48 Direction Correction Auxiliary Cylinder

Claims (9)

While crushing the existing buried pipe buried in the ground with the cutter head of the propulsion unit, it is a method of propelling the renewed pipe with the propulsion unit together with the leading conduit to be preceded,
Excavating a starting pit from the ground surface at the start position of the buried pipe, and installing the propulsion unit in the starting position;
Placing the guide device preceding the leading conduit into the tube of the buried pipe using the buried pipe as a guide travel path;
The propulsion unit is positioned at a position where the leading conduit is eccentric from the axis of the buried pipe and partially overlaps with the buried pipe, and the guide device and the leading pipe are connected by an eccentric support arm. And a process of
The guide pipe is advanced by pushing the tip pipe with the propulsion unit while crushing a part of the buried pipe with the cutter head of the propulsion unit, and using the buried pipe as a guide travel path and receiving a reaction force during crushing. Propelling the renewal tube with the leading conduit while moving;
Reconstruction promotion method for existing buried pipes, characterized by comprising   Measure the amount of positional deviation of the tip of the leading conduit with respect to a preset direction of propulsion, adjust the direction of the cutter head in a direction to eliminate the amount of positional deviation, and propel the leading conduit while correcting the propelling direction. The reconstruction promotion construction method for an existing buried pipe according to claim 1.   In conjunction with the direction correction of the front conduit, the buried pipe is not used for receiving a reaction force at the time of direction correction, so that the support posture of the front conduit by the eccentric support arm is changed to assist the direction correction of the front conduit. The method for promoting the reconstruction of an existing buried pipe according to claim 2.   The reforming promotion of the existing buried pipe according to any one of claims 1 to 3, wherein the leading pipe is pushed in parallel with the buried pipe at a position eccentric from the axial center of the buried pipe. Construction method. A device that uses a propulsion unit to propel a new renewal pipe with a leading conduit that precedes it while crushing an existing buried pipe buried in the ground with a propulsion unit,
A propulsion device main body to which the renewal pipe and a screw accommodated in a casing coaxially with the renewal pipe are connected;
A leading conduit connected to the tip of the renewal tube;
A cutter head that is attached to the tip of the leading conduit and to which rotational torque is transmitted from the screw;
A guide device that is movably inserted into the pipe of the buried pipe and moves the buried pipe as a guide travel path;
The guide device and the leading conduit are connected, and the leading conduit is received through the guiding device as a reaction force at a position that is eccentric from the axis of the buried tube and partially overlaps the buried conduit. An eccentric support arm to support;
A device for promoting the reconstruction of an existing buried pipe.   A connecting portion between the eccentric support arm and the leading conduit is provided on the outer peripheral surface of the leading conduit behind the connecting portion between the cutter head and the leading conduit, and from the connecting portion, the eccentric supporting arm is connected to the cutter head and the leading conduit. The extension propulsion device for an existing buried pipe according to claim 5, which extends parallel to the outer peripheral surface.   The cutter head is swingably connected to the tip of the tip conduit, and the tip conduit is eliminated in accordance with the amount of tip tip misalignment from a preset propulsion direction. 6. The reforming propulsion device for an existing buried pipe according to claim 5, further comprising a direction correcting cylinder that swings the cutter head in a direction to adjust a propulsion direction.   The guide device connects the direction correction auxiliary cylinder and the eccentric support arm and drives a link mechanism that adjusts a relative eccentric position of a leading conduit relative to the buried pipe, and drives the link mechanism, The repositioning propulsion device for an existing buried pipe according to claim 7, further comprising a direction correction auxiliary cylinder that assists in correcting the direction of the leading conduit.   The reforming propulsion device for an existing buried pipe according to claim 8, wherein the guide device includes a cylindrical main body frame having a sliding member that slides on an inner peripheral surface of the buried pipe.

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