JP4499766B2 - Existing pipe renewal device - Google Patents

Description

The present invention relates to an existing pipe updating device for laying gas pipes, water pipes, sewage pipes, etc., and replacing an old pipe with a new pipe.

  Conventionally, when replacing old pipes that have been laid underground such as gas pipes and water pipes with new pipes, exchanging pipes by excavating grooves from the surface to the end point of existing pipes, There was a method of pulling out the abolished pipe from the working hole while cutting it and inserting a new pipe into the subsequent propulsion hole.

  Further, as disclosed in Patent Document 1, a work hole is excavated at the start position and the end position of the existing pipe, the existing pipe is expanded and broken at the work hole, and the new pipe is formed at the propulsion hole of the expanded fracture mark. The method of inserting is also performed. In addition, as disclosed in Patent Document 2, a work hole is excavated at the start position and the end position of the existing pipe, the existing pipe is subjected to diameter expansion failure in the work hole, and a resin layer is formed on the inner wall of the diameter expansion fracture trace. There has also been proposed a method of forming the film.

Furthermore, as disclosed in Patent Document 3, the existing pipe is not destroyed, the new pipe is inserted into the existing pipe, and the gap between the existing pipe and the new pipe is filled with an interstitial material such as mortar. There is also a way to fix.
Japanese Unexamined Patent Publication No. 57-120789 JP-A-5-24113 JP 2004-218827 A

  However, in the method of exchanging the pipe by excavating the groove from the start point to the end point of the existing pipe, much labor and cost are required for excavation and restoration, and when there is a structure on the pipe depth or on the ground There was a problem that the work itself was impossible.

  In the method disclosed in Patent Document 1, the fracture piece of the existing pipe and the new pipe are not integrated, and a certain gap remains, and in the case of soil with a lot of groundwater, the gap becomes a water channel. There was a risk of taking in earth and sand and adversely affecting the ground. In addition, in the case of an area where the groundwater level is high, bending stress due to water pressure is more easily applied to the new pipe, so it is difficult to maintain the shape or linearity of the new pipe itself.

  In the method disclosed in Patent Document 2, a new pipe is formed in which the fracture pieces of the existing pipe are integrated by the resin layer. For example, when updating an existing pipe made of concrete, the load There was a problem that the strength of the tube against the remarkably decreased compared with before the renewal.

  Furthermore, in the method disclosed in Patent Document 3, since the new pipe is limited to one having an outer diameter smaller than the inner diameter of the existing pipe, the transportation capacity of gas or tap water after the existing pipe is renewed Had a problem that it was lower than before the update.

The present invention has been made in view of the background art described above, and an object of the present invention is to provide an existing pipe renewal device capable of laying a new pipe having high strength safely with a simple construction method.

The present invention includes a crushing portion that progresses in a renewed existing pipe and expands and destroys the diameter, and a new installation that is positioned at the rear end in the traveling direction of the crushing section and that is inserted into the existing pipe that has been expanded and broken while holding the new pipe A slow-hardening lubricant discharge part having a discharge port for a liquid slow-hardening lubricant that is provided in the tube holding part, and is provided in the new pipe holding part, and is filled in a gap between the existing pipe that has been expanded and destroyed, and the new pipe ; It is provided so as to cover the discharge part of the new pipe holding part, and is located on the crushing part side with respect to the discharge port so as to cover the side peripheral surface of the new pipe holding part so as to face the crushing part. A frustoconical anti-flow material having a reduced outer diameter is provided, and the anti-flow material is an existing pipe renewal device that prevents the slow-hardening lubricant from flowing into the crushing portion side of the discharge port .

  Further, the slow-hardening lubricant discharge portion is provided with a flow-inducing groove for the slow-hardening lubricant on the periphery of the discharge port or on the new tube holding portion side.

According to the existing pipe update device of the present invention, the existing pipe can be updated in a short time and at a low cost. Furthermore, after the renewal, the broken piece of the existing pipe and the new pipe are integrated by the hardened layer of the slow-acting lubricant to increase the strength, and there is no fear of ground subsidence on the ground. In addition, the transportation capacity of pipelines such as gas and tap water can be equal to or better than existing pipes.

Furthermore , according to the existing pipe renewal device of the present invention, the slow-hardening lubricant is filled simultaneously with the breaking operation of the existing pipe, so that the insertion resistance of the new pipe is reduced, the insertion load of the new pipe is reduced, and the work time is almost increased. do not do. Further, the slow-hardening lubricant can be filled in the entire gap between the existing pipe and the new pipe evenly by the flow preventing material and the flow guide groove provided in the resin discharge section, and the new pipe can be inserted more easily.

Hereinafter, an embodiment of an existing pipe updating apparatus according to the present invention will be described with reference to the drawings. First, the configuration of equipment and equipment used for work will be described. The existing pipe renewal device of this embodiment is supplied with a breaking device 16 that expands and breaks the existing pipe 10, a winch 18 that pulls the breaking device 16 through the wire 20, and a slow-acting lubricant supply device 34 that will be described later. Hose 36.

  The breaking device 16 includes a crushing portion 24 having a portion whose diameter is slightly larger than the inner diameter dimension of the existing tube 10, a slow-hardening lubricant discharge portion 30 that discharges a slow-hardening lubricant supplied from the hose 36, and the new tube 22. A new pipe holding part 32 for holding one end is provided. These are formed in the above order as viewed from the side pulled by the wire 20.

  The slow-hardening lubricant discharge unit 30 includes a receiving port 26 that receives the slow-hardening lubricant 44 via the hose 36 and a discharge port 28 that discharges the receiving port 26. A new pipe holding section 32 is provided on the base end side of the slow-hardening lubricant discharging section 30, and the tip of the new pipe 22 that updates the existing pipe 10 is connected to the slow hard lubricant discharging section 30.

The slow-hardening lubricant 44 is a material generally used for the press-fitting propulsion method and the like, and is a liquid fluid during construction work to reduce friction during press-fitting and harden in 1 to 4 months after the construction work is completed. It is a material that functions as a backfill material. For example, the brand name AHL, which is a cement-based material mainly composed of CaO, SiO _2, etc., sold by Medicinal Materials Development Center Co., Ltd. Corresponds to this.

  Further, the slow-hardening lubricant discharge part 30 of the crushing device 16 has a flow-preventing material 46 for preventing the slow-hardening lubricant from flowing into the front part (crushing part side part) of the discharge port 28, and the anti-flowing material 46 is slow-hardening. A fixing tool 48 attached to the lubricant discharge part 30 and a flow guide groove 50 provided in the peripheral part of the discharge port 28 for guiding the flow of the slow-hardening lubricant 44 are provided.

As shown in FIG. 4, the flow preventing material 46 includes a cylindrical mounting portion 54 having a mounting hole 52 for mounting on the slow-hardening lubricant discharging portion 30, and a slow-hardening lubricant discharging portion of the new pipe holding portion 32. 30, is located on the crushing part 24 side with respect to the slow-hardening lubricant discharge port 30, covers the side peripheral surface of the new pipe holding part 32, covers the outer side toward the crushing part 24 side. It has an opening 56 having a reduced diameter and having one end of a cylindrical shape widened in a trumpet shape. For example, when the movement of the crushing device 16 is stopped in the middle of the diameter expansion destruction operation of the existing pipe 10 or when the movement speed is reduced, the anti-flow material 46 is provided with the slow-hardening lubricant discharged from the discharge port 28. It works to protect against the crushing part side. Note that the attachment portion 52 of the flow preventing material 45 does not necessarily have a cylindrical shape, as long as it can be mounted so as to circulate according to the shape of the outer periphery of the slow-hardening lubricant discharge portion 30.

The flow guide groove 50 is provided so as to go around the side surface from the position of the discharge port 28, and the slow-hardening lubricant discharged from the discharge port 28 circulates along the flow guide groove 50 and the entire outer peripheral surface of the new pipe. It is filled evenly.

  Next, the operation of the existing pipe update device and the existing pipe update method will be described. First, as shown in FIG. 3, work holes 12 and work holes 14 are excavated at both end positions of the existing pipe 10 at predetermined intervals. On one working hole 14 side, the wire 20 drawn from the winding part of the winch 18 is inserted into the existing pipe 10. In the other working hole 12, the tip of the wire 20 is fixed to the tip of the crushing portion 24 of the breaking device 16, the wire 20 is wound up by the winch 18, and the crushing device 24 is slid within the existing pipe 10. One end of the new tube 22 is held by the crushing device 16 and is inserted following the crushing device 16.

  A slow-hardening lubricant supply device 34 and a hose 36 connected from the supply device to the crushing device 16 are provided on the ground, and the slow-hardening lubricant is supplied to the crushing device 16.

  When the winch 18 rotates and the crushing device 16 is pulled by the wire 20, the crushing part 24 has a larger dimension than the inner diameter of the existing pipe 10, so that the existing pipe 10 is expanded and broken. As the crushing device 16 advances, the new pipe 22 is inserted into the propulsion hole 40 formed by the crushing portion 24 so as to follow. At the same time, a liquid slow-hardening lubricant 44 at a predetermined flow rate sent from the slow-hardening lubricant supply device 34 to the receiving port 26 via the hose 36 is discharged from the discharge port 28 and fills the gap between the propulsion hole 40 and the new pipe 22. Is done. The liquid slow-hardening lubricant 44 has an appropriate fluidity, and as shown in FIG. 2, the gap between the existing pipe 10 and the new pipe 22 that have been expanded and broken, and the gap between the fracture pieces 42 of the existing pipe. Filled every corner.

  Further, after completion of the diameter expansion destruction work of the entire existing pipe 10 and the insertion work of the new pipe 22, when a predetermined period elapses, the slow-hardening lubricant 44 hardens integrally with the fracture pieces 42 of the existing pipe and the new pipe 22. Thus, the renewal pipe 58 having a pipe strength higher than that of the existing pipe is formed.

  The shape and number of the flow guide grooves 50 are not limited to those in the embodiment of FIG. 5, but may be formed with the flow guide grooves 60 radially as shown in FIG. It can be set as appropriate according to the properties of the gap between the pipe and the new pipe, the material of the existing pipe and the new pipe, the fluidity of the slow-hardening lubricant, and the like.

The existing pipe renewal device of the present invention is generally suitable for renewal work of synthetic resin pipes such as vinyl chloride and concrete pipes, but is not limited thereto. In the present embodiment, the slow-hardening lubricant discharging unit 30 is provided with only one discharge port 28. However, if the discharge port 28 is provided at a plurality of positions, the entire outer peripheral surface of the new pipe can be easily filled without deviation. Moreover, in the said embodiment, the crushing part 24 and other parts (the said discharge part 30 and the said holding | maintenance part 32) are separate units, Comprising: The form which connects with the connection part 38 and forms the crushing apparatus 16 is illustrated. However, all the parts of separate units may be connected, or each part may be integrally formed.

It is an expanded sectional view showing the existing pipe crushing device of one embodiment of this invention. It is AA sectional drawing of FIG. It is a whole sectional view explaining the updating method of the existing pipe of the invention of this embodiment. It is the front view and side view which show the flow prevention material of the crushing apparatus of this embodiment. It is a side view which shows the slow-hardening lubricating material discharge part of the crushing apparatus of this embodiment. It is a side view which shows the other example of the slow-hardening lubricating material discharge part of the crushing apparatus of this embodiment.

DESCRIPTION OF SYMBOLS 10 Existing pipes 12 and 14 Work hole 16 Crushing device 18 Winch 20 Wire 22 New pipe 24 Crushing part 26 Receiving port 28 Discharge port 30 Slow hard lubricant discharge part 32 New pipe holding part 34 Slow hard lubricant supply apparatus 36 Hose 38 Connection part 40 Propulsion hole 42 Destruction piece 44 Slow-hardening lubricant 46 Flow prevention material 48 Fixture 50, 52 Flow induction groove

Claims (2)

A crushing part that progresses in the existing pipe to be renewed and expands and destroys the diameter, and a new pipe holding part that is located at the rear end in the traveling direction of the crushing part and holds the new pipe and is inserted into the existing pipe that has been expanded and destroyed. the provided new tube holding portion, and a slow-curing lubricant discharging portion having a discharge port of the slow-curing lubricants of liquid to be filled into the gap enlarged broken the existing pipe and new pipe, the new pipe holder Is provided so as to cover the discharge portion, and is located on the crushing portion side with respect to the discharge port so as to cover the side peripheral surface of the new pipe holding portion, and has an outer diameter toward the crushing portion. An existing pipe renewal device characterized in that a reduced frustoconical anti-flow material is provided, and the anti-flow material prevents the slow-hardening lubricant from flowing into the crushing portion side of the discharge port .   2. The existing pipe updating device according to claim 1, wherein the slow-hardening lubricant discharge section is provided with a flow-inducing groove for the slow-hardening lubricant on a circulation portion of the discharge port or on the new pipe holding section side.

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