JP4426949B2 - Replacement method for existing pipes - Google Patents

Description

The present invention relates to replacement method of replacement Ru existing pipe a plurality of non-metallic tube existing pipe formed by connecting a metal fitting to update pipe together are buried in the ground.

  For example, the existing pipe is replaced when the existing pipe is old or when it is desired to replace the pipe with a different diameter. The replacement of the existing pipe is, for example, by excavating the ground to take out the existing pipe and then bury the renewal pipe.

On the other hand, a rod is inserted into the existing pipe, a cutting blade is attached to the tip of the rod, an update pipe is attached to the cutting blade, and the rod is pulled to operate the existing pipe with the cutting blade. A replacement method in which the renewal pipe is pulled in while being cut from the inside is considered (see Patent Document 1). This replacement method assumes that the existing pipe is made of metal.
JP-A-11-117676

  In the above conventional example, when cutting an existing pipe with a cutting blade, the resistance for passing the cutting blade through the existing pipe is large, and the debris of the existing pipe cut by the cutting blade is pulled from the upstream side in the traveling direction of the cutting blade. It is pointed out that the renewal pipe is difficult to push away, and the replacement work takes time.

  In addition, as existing pipes buried in the ground, for example, a composite structure in which a plurality of non-metallic pipes such as synthetic resin, asbestos or ceramics are arranged in a row and each non-metallic pipe is connected by a metal joint. However, in the above conventional example, it is not assumed that the existing pipe having such a composite configuration is replaced with a new pipe, and it is considered that the replacement is difficult.

The present invention provides a replacement method that enables multiple non-metallic pipe with being embedded in the earth can be interchanged existing pipes of composite construction formed by connecting a metal fitting, easily and quickly update pipe It is an object.

The replacement method of the existing pipe according to the present invention is a method of replacing an existing pipe formed by connecting a plurality of non-metallic pipes with a metal joint and being replaced with a renewal pipe. A preparatory step for recognizing the position of the joint, a crushing step for crushing the recognized metal joint from the inside thereof, and crushing the non-metallic pipe from the inside to one side in the tube axial direction while upstream of the crushing direction A renewal step of arranging an renewal pipe on the crushing mark of the existing pipe from the side, and when crushing the nonmetallic pipe from the inside to the one in the tube axis direction in the renewal step, from the inner diameter of the nonmetallic pipe A large barrel portion, and a cone portion provided on one end side of the barrel portion and having a diameter that is the smallest diameter portion on the distal end side that is smaller than the inner diameter of the non-metallic pipe. Channel that allows fluid lubricant to be discharged to the other end of the part Used provided a drill, it is characterized in that so as to discharge the fluidity of the lubricating material from the hole is provided on its conical portion and the body with the movement of the drill.

  In this case, it is possible to install the renewal pipe in a state where the existing pipe in the soil is crushed and left in the soil, and the classic pipe is excavated and the existing pipe is taken out and replaced with the renewal pipe. Compared to the construction method, it can be replaced easily and quickly. Moreover, in the renewal process, as the drill progresses, the lubricant is discharged from the downstream side and the upstream side in the direction of travel, so that the existing pipe can be crushed and the renewal pipe can be installed smoothly and quickly. Can be done smoothly.

Preferably, a drill is used in which a rod connecting portion to which a tip of a drill pulling rod is connected is provided on the reduced diameter end side of the conical portion .

  In this case, the rod can be pulled in a well-balanced manner by connecting a rod to the center portion of the drill.

Preferably, the rod connecting portion is formed in a cylindrical shape, and a female screw hole into which a male screw portion formed at a tip of a drill pulling rod is screwed is provided on an inner periphery thereof . A drill is used.

  In this case, it is possible to easily connect the drill and the rod by tightening male and female screws.

  Preferably, in the preparation step, the metal exploration is performed by providing two shafts communicating with the existing pipe, inserting a rod having a metal exploration device at a tip thereof into the existing pipe from the one shaft side, and sending the rod to the other shaft side. After detecting the metal joint with the device, the detection position is recorded, and in the crushing step, the metal exploration device at the tip of the rod is replaced with a joint crushing device, and the joint crushing device is replaced with the preparation step. The metal joint is sent to the recorded location of the metal joint, and the metal joint is crushed, and the renewal step replaces the joint crushing device at the tip of the rod with the drill, and at the rear end side of the drill. A renewal pipe is attached, and the rod is pulled back to the shaft side of the rod insertion side, and the non-metallic pipe of the existing pipe is expanded and crushed from the inside by the drill, It is intended to place the update pipe crushing remains of 設管.

  Here, in short, each process is specifically specified, and the replacement method of the existing pipe is clarified by these specific items.

  The replacement method of the present invention can easily and quickly replace an existing pipe having a composite structure in which a plurality of non-metallic pipes are buried in the ground and are connected by metal joints. Therefore, the time and labor required to replace the existing pipe can be reduced, which can contribute to the reduction of the replacement cost.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is soil, and an existing pipe 2 is embedded in the soil 1 substantially in parallel with the ground surface.

  When this existing pipe 2 is aged or when it is desired to replace it with a pipe having a different diameter, the existing pipe 2 is replaced with the renewal pipe 2a.

  The existing pipe 2 has, for example, a composite configuration in which three non-metallic pipes 3, 4, 5 are arranged in a line and connected by metal joints 6, 7. In addition, the renewal pipe 2a has a composite configuration in which three non-metallic pipes 3a, 4a, 5a are arranged in a line and are connected by metal joints 6a, 7a, similarly to the existing pipe 2.

  The existing nonmetallic pipes 3 to 5 are made of, for example, a synthetic resin such as polyethylene or vinyl chloride, or a nonmetallic material such as asbestos or porcelain. The non-metallic pipes 3a to 5a to be newly replaced can be made of an appropriate material such as a synthetic resin such as polyethylene or vinyl chloride, or a metal pipe such as steel. The existing metal joints 6 and 7 and the newly replaced metal joints 6a and 7a are generally known, for example, cylindrical shapes that are arranged so as to surround the butt ends of two non-metallic pipes and tightened. belongs to.

  Next, the work and procedure for replacing the existing pipe 2 with the update pipe 2a will be described in detail.

  Moreover, since this excavation method uses the excavation apparatus 10, the metal exploration apparatus 20, the joint crushing apparatus 30, and the drill 40, these structures are demonstrated first.

  The excavation device 10 has a function of feeding and pulling back the long rod 11 while spirally rotating, and generally known devices can be used.

  The metal exploration device 20 has a function of sensing a specific metal, and a generally known metal detector or the like can be used.

  The joint crushing device 30 crushes the metal joints 6 and 7 from the inside. For example, as shown in FIG. 6, hydraulic jacks 32 and 33 are provided at two positions every 90 degrees on the outer periphery of the central base 31. In this configuration, the support legs 34 and 35 are provided at two positions opposite to each of the hydraulic jacks 32 and 33 by 180 degrees. In other words, the joint crushing device 30 is attached to the piston tips of the hydraulic jacks 32 and 33 with the support legs 34 and 35 abutting against the inner circumferences of the metal joints 6 and 7 of the existing pipe 2 to be crushed. The attached sharp members 36 and 37 are protruded outward in the radial direction so as to be crushed from the inside of the metal joints 6 and 7. Although not shown in the drawings, the joint crushing device 30 may have a configuration in which hydraulic jacks are provided at all of a plurality of circumferentially spaced intervals, and is not particularly limited.

The drill 40 is for expanding and crushing the existing pipe 2, for example, as shown in FIGS. 10 to 12, a cylindrical body 41, a conical part 42 provided at one end of the body 41, and a cone Part 42
And a rod connecting portion 43 provided at the tip. The outer diameter of the trunk portion 41 is set larger than the inner diameter of the existing pipe 2 and the outer diameter of the update pipe 2 a, and the outer diameter of the rod connecting portion 43 is set smaller than the inner diameter of the existing pipe 2. The rod connecting portion 43 is formed in a cylindrical shape, and has an inner periphery formed as a female screw hole, and the male screw portion 11a at the tip of the rod 11 is screwed and coupled. At the other end of the body portion 41, a connecting portion 44 is provided on which a connecting member 50 for pulling the update pipe 2a is locked. At several places on the circumference of the conical portion 42, sharp projecting blades 45 called bits are provided. Injecting holes 46a and 46b for discharging a fluid lubricant are provided in several places on the circumference of the conical part 42 and several places on the other end of the body part 41. As this lubricant, water or a material obtained by adding a component called mud or bentonite to water is preferably used.

  In this drill 40, the lubricant in the lubricant tank 60 connected to the excavation apparatus 10 is introduced through a passage 11 b provided at the center of the rod 11. The drill 40 is provided with an introduction passage 40a connected to the central passage 11b of the rod 11 at the center thereof. The introduction passage 40a is connected to each injection hole through passages 40b and 40c extending in the radial direction. 46a and 46b are connected in communication.

  Specifically, the replacement method in this embodiment includes a preparation step for recognizing the existence positions of the metal joints 6 and 7 in the existing pipe 2, a crushing step for crushing the recognized metal joints 6 and 7 from the inside, An updating step of disposing the renewal pipe 2a on the crushing trace of the existing pipe 2 from the upstream side in the crushing direction while crushing the non-metallic pipes 3 to 5 in the existing pipe 2 from the inside to one side in the pipe axis direction.

  Hereinafter, each process will be described in detail.

(Preparation process)
As shown in FIG. 1, a starting pit 8 and a reaching pit 9 that are connected to the existing pipe 2 by a excavation device 10 are provided at appropriate locations on the soil 1. The start shaft 8 is used as a shaft on the side where the rod 11 is inserted, and the arrival shaft 9 is used as a shaft on the side where the rod 11 reaches. In this embodiment, from the relationship in which the start pit 8 and the arrival pit 9 are formed to be relatively small, particularly on the arrival pit 9 side, in order to smoothly introduce the renewal pipe 2a, from the side wall portion of the arrival pit 9 An inclined groove 9a reaching the ground surface is excavated.

  Then, as shown in FIG. 2, the rod 11 is spirally rotated by the excavating device 10 and sent out to be inserted into the start pit 8 while excavating the soil 1. A metal exploration device 20 is attached to the tip of the rod 11 arranged in the start pit 8, and the metal exploration device 20 is inserted into the existing pipe 2 from the start pit 8 side as shown in FIG. By sending to the side, the metal exploration device 20 detects the metal joints 6 and 7 and the operator records the position information of the detection point. You may make it memorize | store this detection point automatically in the memory | storage part with which the control system (illustration omitted) of the metal exploration apparatus 20 is equipped.

  After this, the tip of the rod 11 is pulled back to the start shaft 8, and the metal exploration device 20 is removed from the tip.

(Crushing process)
As shown in FIG. 4, after the joint crushing device 30 is attached to the tip of the rod 11 located on the start pit 8 side, as shown in FIG. The metal joints 6 and 7 are sequentially crushed by the joint crushing device 30.

In this way, as shown in FIG. 7, the joint crushing device 30 attached to the tip of the rod 11 is fed until it protrudes into the access shaft 9, and the joint crushing device 30 is removed from the rod 11.

(Update process)
As shown in FIG. 8, a drill 40 is attached to the tip of the rod 11 existing in the access shaft 9. At this time, the male screw part 11a at the tip of the rod 11 is attached by being screwed into the female screw hole of the rod connecting part 43 of the drill 40. Further, the renewal tube 2 a is attached to the connecting portion 44 on the other end side of the body portion 41 of the drill 40 via the connecting member 50.

  Then, as shown in FIG. 9 and FIG. 10, the rod 11 is pulled back to the start pit 8 side, so that the non-metallic pipes 3 to 5 in the existing pipe 2 are sequentially expanded and crushed from the inside by the drill 40. However, the renewal pipe 2a is arranged on the crushing trace of the existing pipe 2.

  When the rod 11 is pulled back, since the rod 11 is spirally rotated, the drill 40 is rotated, and the non-metallic pipes 3 to 5 are crushed while the diameter of the nonmetallic pipes 3 to 5 is increased by the protruding blade 45 of the rotating drill 40. Will be.

  Moreover, in the process of pulling back the drill 40, the fluid lubricant is substantially continuously formed from the plurality of injection holes 46a provided in the conical portion 42 and the plurality of injection holes 46b provided in the rear end of the body portion 41. To be injected. In this case, since the lubricant injected from the injection hole 46a of the conical portion 42 of the drill 40 flows between the drill 40 and the existing pipe 2 as the drill 40 advances, resistance when the drill 40 advances is reduced. At the same time, the ground from the crushed debris of the existing pipe 2 is soaked into the soil 1 on the outer diameter side to loosen the ground, and as a result, the crushed debris of the existing pipe 2 is easily pushed to the outer diameter side of the drill 40. Further, the lubricant sprayed from the injection hole 46b at the rear end of the body portion 41 of the drill 40 flows between the crushing debris of the existing pipe 2 and the renewal pipe 2a as the drill 40 proceeds, and crushes the existing pipe 2. Since the soil penetrates into the soil 1 on the outer diameter side from the debris and loosens the ground, the renewal pipe 2a makes it easier to push the crushed debris of the existing pipe 2 toward the outer diameter side of the drill 40, and the renewal pipe 2a Resistance is reduced.

  If it does in this way, as shown in FIG. 13, the existing pipe | tube 2 embed | buried in the soil 1 can be replaced with the update pipe | tube 2a.

  As explained above, the excavation pipe 8a is simply excavated in the soil 1 and the existing pipe 2 in the soil 1 is crushed and left in the soil 1 after that. It is installed.

  In particular, in the preparation step, the presence position of the metal joints 6 and 7 is recognized only by performing the feeding operation of the rod 11, and in the crushing step, the remote operation of the joint crushing device 30 is performed simultaneously with the feeding operation of the rod 11. By doing so, the metal joints 6 and 7 are crushed. Further, in the renewal process, the non-metallic pipes 3 to 5 are crushed and the renewal pipe 2a is installed at the same time only by feeding the rod 11. I have to.

  Therefore, for the existing pipe 2 having a composite structure in which a plurality of non-metallic pipes 3 to 5 are connected by metal joints 6 and 7 and are buried in the ground, the work to replace the same update pipe 2a is performed. It can be done easily and quickly. In particular, in the renewal process, as the drill 40 advances, the lubricant is discharged from the downstream side and the upstream side in the traveling direction, so that the crushing of the existing pipe 2 and the installation of the renewal pipe 2a can be performed smoothly and quickly. It is possible to perform the update work smoothly.

Thus, since excavation of the soil 1 and the existing pipe 2 is taken out, the replacement work can be performed easily and quickly compared to the classic method of installing the renewal pipe 2a. This is advantageous in reducing the replacement cost.

  Hereinafter, other embodiments of the present invention will be described.

  (1) Although not shown, the drill 40 has a hollow portion 41 and a conical portion 42, and the flow passages 40b and 40c leading to the pipe for the introduction passage 40a and the injection holes 46a and 46b at the inner center thereof. It can be set as the structure which accommodated and arrange | positioned the pipe for use.

  (2) In the above replacement method, the transition from the preparation step to the crushing step may be performed as follows. That is, although not shown in the drawing, the metal exploration device 20 is removed from the tip of the rod 11 located in the reaching pit 9 without pulling the rod 11 that has reached the reaching pit 9 side in the preparation step back to the starting pit 8. Instead, the joint crushing device 30 is attached. Then, by pulling the rod 11 to the start pit 8 side, the metal joints 6 and 7 are sequentially crushed by sequentially sending them to the existing positions of the metal joints 6 and 7 recognized in the preparation step. In this case, since the crushing process can be performed in the process of pulling back the rod 11 sent in the exploration operation in the preparation process, it is possible to omit a useless operation related to the feeding back of the rod 11, and the replacement work can be performed quickly and efficiently. You can do it.

  (3) In the above replacement method, the crushing step and the updating step can be performed simultaneously. That is, although not shown, for example, in the state where the presence position of the metal joints 6 and 7 is recognized in the preparation process and the rod 11 to which the metal exploration device 20 is attached has reached the arrival shaft 9 side, The metal exploration device 20 is removed from the tip of the rod 11 located in the reaching shaft 9 without pulling the rod 11 reaching the starting shaft 8 back to the starting shaft 8, and a joint crushing device 30 and a drill are attached to the tip of the rod 11. 40 and the renewal tube 2a are attached in this order. Then, the metal joints 6 and 7 and the non-metallic pipes 3a to 3c recognized in the preparation process are sequentially crushed by pulling the rod 11 to the start pit 8 side by the excavating device 10, and the crushed trace is obtained. The update pipe 2a is installed. In this case, since the crushing step and the updating step can be performed at the same time in the process of pulling back the rod 11 sent by the exploration operation in the preparation step, it is possible to omit a useless operation related to the feed back of the rod 11, and the replacement work. Can be performed more efficiently and quickly.

It is explanatory drawing which shows the initial stage of a preparation process by one Embodiment of the replacement construction method of the existing pipe which concerns on this invention. It is explanatory drawing which shows the continuation of FIG. FIG. 3 is an explanatory diagram showing a continuation of FIG. 2. It is explanatory drawing which shows the initial stage of the crushing process following FIG. It is explanatory drawing which shows the continuation of FIG. FIG. 6 is an arrow view showing an enlarged cross section taken along line (6)-(6) in FIG. 5. It is explanatory drawing which shows the continuation of FIG. It is explanatory drawing which shows the initial stage of the update process following FIG. It is explanatory drawing which shows the continuation of FIG. It is explanatory drawing which shows a mode that it is crushing with the drill of FIG. It is the perspective view which looked at the drill of FIG. 10 from the front end side. It is the perspective view which looked at the drill of FIG. 11 from the rear end side. It is explanatory drawing which shows the state which replacement | exchange completed.

DESCRIPTION OF SYMBOLS 1 Soil 2 Existing pipes 3-5 Nonmetallic pipes 6 and 7 of existing pipes Metal joints 2a of existing pipes Update pipes 3a to 5a Nonmetallic pipes 6a and 7a of update pipes Metal joints 8 of update pipes Reach pit 10 Drilling device 11 Rod 40 Drill 41 Body 42 Conical part 40a Introduction path 40b, 40c Flow path 46a, 46b Injection hole

Claims (4)

It is a method of replacing an existing pipe that is buried in the ground and connected with a plurality of non-metallic pipes with metal joints, with an update pipe,
A preparation process for recognizing the position of a metal joint in an existing pipe;
Crushing step of crushing the recognized metal joint from the inside;
An update step of placing an update pipe on the crushing trace of the existing pipe from the upstream side in the crushing direction while crushing the non-metallic pipe from the inside to the pipe axis direction one side,
When the non-metallic pipe is crushed from the inner side to one side in the tube axial direction in the renewal step, a trunk portion larger than the inner diameter of the non-metallic pipe, and a distal end side provided on one end side of the trunk portion and having a reduced diameter The outer diameter of the smallest diameter portion is smaller than the inner diameter of the non-metallic pipe, and a flow path for discharging a fluid lubricant is provided on the conical portion and the other end side of the body portion. A method for replacing an existing pipe, characterized in that a fluid lubricant is discharged from a hole provided in a conical portion and a body portion of the drill using the drill that is provided. In the replacement method of the existing pipe according to claim 1,
A method for replacing an existing pipe, wherein a drill is used in which a rod connecting portion to which a tip of a drill pulling rod is connected is provided on the reduced diameter end side of the conical portion. In the method of replacing the existing pipe according to claim 2,
The rod connecting portion is formed in a cylindrical shape, and a drill having a female screw hole in which a male screw portion formed at a tip of a drill pulling rod is screwed is provided on an inner periphery thereof. A method for replacing existing pipes. In the replacement method of the existing pipe according to claims 1 to 3 ,
In the preparation step, two shafts communicating with the existing pipe are provided, and a metal rod with a metal exploration device attached to the tip is inserted into the existing pipe from the one shaft side and sent to the other shaft side to send a metal After detecting the joint, record the detection position,
In the crushing step, the metal exploration device at the tip of the rod is replaced with a joint crushing device, and the joint crushing device is sent to the existing position of the metal joint recorded in the preparation step to crush the metal joint. Yes,
The renewal step replaces the joint crushing device at the tip of the rod with the drill, attaches an renewal tube to the rear end side of the drill, and pulls the rod back to the shaft side on the rod insertion side, thereby using the drill. A replacement method for an existing pipe, characterized in that an update pipe is placed on the crushing mark of the existing pipe while expanding and crushing the non-metallic pipe of the existing pipe from the inside.

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