JP4615928B2 - Rehabilitation of existing pipes - Google Patents

Description

In the present invention, a long belt-like body having joints formed on both side edges is manufactured by a pipe making machine while joining the joints spirally to the inner surface of a pipe rod (hereinafter referred to as “existing pipe”). with tubes, it relates rehabilitation how the existing pipe for injecting the mortar into the gap between the existing pipe and the newly formed helical pipe, and more particularly, to mortar backfill method when existing pipe rehabilitation.

Conventionally, as a rehabilitation how the existing pipe, as shown in FIGS. 3 and 4, the pipe producing machine 11 installed in the existing pipe 10, a flexible joint is formed on both side edge portions A spiral tube (rehabilitated tube) 13 is molded and inserted into the existing tube 10 while winding and joining the belt-shaped profile 13a in a spiral shape, and at the same time, in the gap 12 between the existing tube 10 and the newly installed spiral tube 13 An existing pipe rehabilitation method for injecting and filling mortar, which is a backfill material, a so-called pipe making simultaneous backfilling method is performed (for example, see Patent Document 1).

  In this case, when mortar as a backfill material is injected and filled into the gap 12 between the existing tube 10 and the spiral tube 13, the existing tube 10 and the spiral tube are inserted from one end of the spiral tube 13 inserted into the existing tube 10. The injection nozzle 14a of the mortar supply hose 14 serving as a backfilling material is inserted into the gap 12 between the mortar 11 and the mortar.

Conventionally, this mortar has a high viscosity with a small water-cement ratio. Such a mortar is kneaded in batch units such as 20 kg, and the existing pipe 10 is conveyed by human power in batch units. It was put into a pump (not shown) installed in the vicinity of the inner pipe making machine 11 and injected and filled into the gap 12 from the supply hose 14.
Japanese Patent Publication No. 3-48392

  Thus, conventionally, mortar, which is a backfill material, is kneaded by, for example, a small batch kneader (not shown) installed on the ground, and the kneaded mortar enters the existing pipe to the pipe making machine. I was carrying it. This is because, for example, when trying to pump from the ground to a pump installed near the pipe making machine using a pipe (hose), the viscosity of the mortar is high, so it can only be used at a short distance, and when it becomes a long distance Because they could not send. Therefore, the mortar backfilling method has a problem that it takes time and man-hours. Furthermore, it has been difficult to rehabilitate with a small tube diameter because humans cannot enter it.

The present invention was devised to solve such problems. The purpose of the present invention is to eliminate the manual conveyance and enable the pressure feeding by the hose, thereby reducing the man-hours and simplifying the labor. It is to provide a rehabilitation how.

The method for rehabilitating the existing pipe of the present invention is to produce a long belt-like body with joints formed on both side edges, while making the pipes by a pipe making machine while joining the joints spirally to the inner surface of the tube. A method for rehabilitating an existing pipe in which high viscosity mortar is injected into a gap between a pipe rod and a newly formed spiral pipe, wherein a pump having a kneading portion is installed in the pipe rod, and a low viscosity with a flow value of 200 mm or more A mortar is supplied from the ground to the pump having the kneading part through a pipe, and an additive for increasing the viscosity is supplied to the kneading part to knead to obtain a high viscosity mortar having a flow value of less than 200 mm. High viscosity mortar is injected into the gap. Here, the flow value was based on JISR5201.

In rehabilitation how the existing pipe of the present invention, the pump having the kneading part, and the area for extruding mortar certain amount, are provided for supplying inlet additive, a region for kneading the mortar with the additive The structure provided with may be sufficient.

In rehabilitation how the existing pipe of the present invention, the pump having the kneading part, have a structure that includes a region for kneading mortar and the additive, and an area for pumping high viscosity mortar is kneaded forward Good.

  Further, as the additive, one or more of metakaolin, attapulgite, and bentonite are dispersed in water, and further, for example, a phosphate compound is included as the dispersant.

  Examples of the dispersing agent include sodium tripolyphosphate and sodium titrapolyphosphate. Examples of phosphate compounds include sodium pyrophosphate.

  An example of a combination as an additive is a combination of 35 parts by weight of metakaolin, 0.7 parts by weight of phosphate, and 100 parts by weight of water.

In this way, kneading mortar with low viscosity enables kneading with a general cement mixer and temporary storage with an agitator, and stable and long-distance transportation (pressure feeding) with a hose is possible. It becomes. Also, the additive is a low-viscosity one containing at least one of metakaolin, attapulgite, and bentonite and a phosphate compound, and a stable and constant amount of long-distance pumping is possible with a hose. Thus, by pumping the additive with a low viscosity mortar from the ground to the vicinity of the pipe producing machine existing pipe in hose, mixed in a constant ratio just prior to injection into the gap between the existing pipe and the spiral tube, increasing A certain amount of viscous mortar can be reliably injected into the gap.

According to the existing pipe rehabilitation method of the present invention, a low-viscosity mortar having a flow value of 200 mm or more is pumped from the ground to a pipe making machine by piping, and before injection into the gap between the pipe rod and the spiral pipe, the low-viscosity mortar When the distance from the ground to the pipe making machine is long, the flow value is less than 200 mm and the mixture is poured into the gap in a state of high viscosity mortar. However, a certain amount of high-viscosity mortar can be reliably injected into the gap. In addition, since manual conveyance is not necessary, man-hours can be reduced and labor can be simplified. In addition, it is possible to rehabilitate small tube tubs that humans cannot enter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Reorganization how the existing pipe of the present embodiment manufactured has an elongated strip-shaped profile of the joint portion is formed on both side edge portions, the pipe producing machine while joining spirally joints on the inner surface of the existing pipe with tubes, rehabilitation how the existing pipe for injecting high viscosity mortar into the gap between the existing pipe and the newly formed helical pipe, is applied to a so-called pipe-simultaneous backfilling method.

That is, a low-viscosity mortar with high fluidity (hereinafter also referred to as “liquid A”) is pumped from the ground to a pipe making machine and added to increase the viscosity of the mortar separately supplied through the pipe before being injected into the gap. A high-viscosity mortar is added by adding an agent (hereinafter also referred to as “liquid B”), and the high-viscosity mortar is injected into the gap between the existing tube and the spiral tube.

  Liquid A is made from raw materials such as cement (ordinary cement, early strong cement, etc.), inorganic admixtures (blast furnace slag, fly ash, silica fume, etc.), expansion agents (aluminum powder, CSA, etc.), admixtures (polycarboxylates). Type, naphthalene sulfonate type, etc.) and polymer dispersions (acrylic type, SBR type, vinyl acetate type, etc.). The liquid A kneaded with these is a low-viscosity mortar having a high fluidity and a flow value of 200 mm or more.

  Liquid B contains at least one of metakaolin, attapulgite, and bentonite, and further contains a dispersant composed of a phosphate compound and water, which is also an additive having a flow of 200 mm or more.

  FIG. 1 shows the arrangement relationship of each apparatus for carrying out the rehabilitation method of this embodiment.

In the figure, reference numeral 10 is an existing pipe, 11 is a pipe making machine, 13 is a spiral pipe, 13a is a profile, 14 is a supply hose , 14a is an injection nozzle, and these configurations are the conventional ones shown in FIGS. Since it is the same as that of a thing, the same code | symbol is attached | subjected. Reference numeral 15 in the figure denotes a profile supply machine, which is placed on the carriage 16 in this embodiment and moves in the spiral pipe forming direction (indicated by an arrow X in the figure) along with the pipe making machine 11 in the existing pipe 10. It is supposed to be. However, the profile supply machine 15 may be installed on the ground.

  On the other hand, a mortar kneading / feeding pump 21 and a hydraulic unit 31 for hydraulically driving the pipe making machine 11 are disposed on the carriage 41 on the opposite side of the profile feeding machine 15 with the pipe making machine 11 interposed therebetween. Has been.

  As shown in FIG. 2, the mortar kneading / feeding pump 21 has a constant supply unit 22 for extruding a certain amount of the liquid A (low viscosity mortar), and a liquid B for increasing the viscosity of the liquid A with respect to the liquid A. And a kneading part 23 for supplying and kneading at a constant ratio, and the partition wall separating the constant quantity supplying part 22 and the kneading part 23 is pushed out the liquid A from the constant quantity supply part 22 to the kneading part 23 by a constant amount. An inflow hole 24 is provided. Further, the fixed amount supply unit 22 is provided with a liquid A inlet 22a at the top thereof, and the kneading unit 23 is provided with a B liquid inlet 23a at the top thereof. Further, a rear end portion of the supply hose 14 having an injection nozzle 14a (see FIG. 1) attached to the front end portion is connected to the front of the kneading portion 23. The mortar kneading / feeding pump 21 is a uniaxial extruder, and the A liquid and the A liquid and the B liquid are uniformly kneaded by the screws 22b and 23b provided in the quantitative supply section 22 and the kneading section 23, respectively. It has come to be.

  Meanwhile, on the ground, a generator 32 for supplying electric power to the hydraulic unit 31, a mortar mixer (ordinary cement mixer) 33 for kneading the A liquid, an agitator 34 for temporarily storing the kneaded A liquid, and the A liquid for the mortar A liquid pump 35 for pumping to the constant supply section 22 of the kneading / feeding pump 21, B liquid tank 36 for kneading and temporarily storing the B liquid, and B liquid are pumped to the kneading section 23 of the mortar kneading / feeding pump 21. A B liquid pump 37 is disposed, and the A liquid pump 35 is connected to the A liquid inlet 22a of the metering supply unit 22 of the mortar kneading / feeding pump 21 by the A liquid hose 38. The B liquid inlet 23 a of the kneading part 23 of the mortar kneading / feeding pump 21 is connected by a B liquid hose 39.

That is, in the ground, by mortar mixer 33 kneaded the A solution composed of the above composition, temporarily stores the agitator 34 as a low viscosity mortar high fluidity on flow value 200mm or more. Then, the A liquid kneaded by the A liquid pump 35 is pressure-fed to the fixed quantity supply unit 22 of the mortar kneading / supply pump 21 through the A liquid hose 38. At the same time, the B liquid having the above composition is kneaded and temporarily stored in the B liquid tank 36, and the B liquid kneaded by the B liquid pump 37 is mixed through the B liquid hose 39 into the kneading section of the mortar kneading / feeding pump 21. 23 is pumped.

  And the A liquid supplied to the fixed supply part 22 is further uniformly kneaded here, the B liquid which is an additive is added in the following kneading part 23, and A liquid and B liquid are kneaded by a fixed ratio. Thus, the mortar that is the liquid A is thickened to a flow value of less than 200 mm to obtain a high-viscosity mortar. 3).

  In the above embodiment, the generator 32, the mortar mixer 33, the agitator 34, the A liquid pump 35, the B liquid tank 36, and the B liquid pump 37 are arranged on the ground. It may be arranged on the front side (left side in FIG. 1) of the unit 31 and mounted on a cart or the like so that it can move together with the pipe making machine 11.

  Next, another example of a method for injecting mortar will be described with reference to FIGS. 5 (a) and 5 (b).

  First, in this example, a mixing and filling pump 101 shown in FIG. High viscosity mortar in a thickened state is injected into the gap 12.

  A mixing and filling pump 101 shown in FIG. 5 includes a two-screw type mixer 102 that uniformly kneads a low-viscosity mortar (liquid A) and an additive (liquid B) that are pumped from the ground. There is provided a snake pump 103 for pumping the thickened high-viscosity mortar uniformly mixed by the shaft screw type mixer 102 to the injection nozzle 14a.

  These twin-screw type mixer 102 and snake pump 103 are each loaded into an existing pipe and placed in the vicinity of the pipe making machine 11 while being mounted on a carriage (not shown).

  A liquid hose 38 and a liquid hose 39 (see FIG. 1) from the ground are connected to the two material inlets 121 and 122 of the twin screw mixer 102, respectively. Further, the extrusion port 123 of the twin screw mixer 102 is connected to the suction port 131 of the snake pump 103 via the connecting hose 104. In FIG. 5, mechanisms such as an electric motor that respectively drive the twin-screw type mixer 102 and the snake pump 103 are not shown.

  The biaxial screw type mixer 102 is a semi-batch type mixer using biaxial screws, and the liquid A and the liquid B respectively supplied to the two material inlets 121 and 122 are mixed with the biaxial screw 120, While being uniformly kneaded at 120, it is pushed forward (to the extrusion port 123 side). In this way, liquid A and liquid B are kneaded at a constant ratio ([liquid A]: [liquid B] = [7 to 15]: [1]) by the twin-screw type mixer 102. Some mortar thickens to a flow value of less than 200 mm.

  For example, the snake pump 103 is in a closed state by always pressing an elastic tubular body (not shown) that is elastic and has a restoring force, and a portion (part) of the elastic tubular body. A pressure roller (not shown), and the fluid in the elastic cylinder, that is, the twin-screw type mixer 102 by the movement of the compression position (pressing position) of the elastic cylinder accompanying the rotation of the pressing roller. The high-viscosity mortar thickened in step 1 is pumped in one direction.

Then, by connecting the supply hose 14 to the discharge port 132 of the snake pump 103 described above, the high-viscosity mortar having a flow value of less than 200 mm is supplied from the injection nozzle 14 a at the tip of the supply hose to the existing pipe 10 and the helical pipe 13. The gap 12 (see FIG. 3) can be injected.

  In the twin-screw type mixer 102 shown in FIG. 5, the direction of the blades of the screw 120 is constant in the extrusion direction. For example, as shown in FIG. If the screw 220 having the opposite direction is used, the kneading degree is improved, so that the liquid A and the liquid B can be mixed more uniformly. Further, the screw type mixer is not limited to two axes, and may be a multi-axis screw type mixer having three or more axes.

It is explanatory drawing which shows the arrangement | positioning relationship of each apparatus for enforcing the rehabilitation method of embodiment of this invention. It is explanatory drawing of a mortar kneading / feeding pump. It is an explanatory diagram of the rehabilitation how of the existing pipe by pipe-simultaneous back-filling method, which is a view as seen from the front of the pipe manufacturing machine. It is an explanatory view of a rehabilitation how the existing pipe by the pipe producing simultaneous backfilling method is a perspective view of a partially broken state showing the pipe producing machine parts. It is a figure which writes together and shows the side view (a) and top view (b) which show typically the structure of the mixing filling pump used for the rehabilitation method of the existing pipe | tube of this invention. It is a side view which shows typically the other example of the screw type mixer which comprises a mixing filling pump.

Explanation of symbols

10 Existing pipe (pipe)
11 Pipe making machine 12 Crevice 13 Spiral pipe (rehabilitation pipe)
13a Profile 14 Supply Hose 14a Injection Nozzle 15 Profile Supply Machine 16 Cart 21 Mortar Kneading / Supply Pump 22 Metering Supply Part 22a A Liquid Inlet 23 Kneading Part 23a B Liquid Inlet 24 Inlet Hole 31 Hydraulic Unit 32 Generator 33 Mortar Mixer 34 Agitator 35 A liquid pump 36 B liquid tank 37 B liquid pump 38 A liquid hose 39 B liquid hose 101 Mixed filling pump 102 Twin screw type mixer 120 Screw 121,122 Material input port 123 Extrusion port 103 Snake pump 131 Suction Port 132 Discharge port 104 Connection hose

Claims (3)

A long belt-like body with joints formed on both side edges is produced by a pipe making machine while joining the joints spirally to the inner surface of the tube and a spiral tube newly formed with the tube A method of rehabilitating an existing pipe in which high viscosity mortar is injected into a gap between the pipe and a pump having a kneading part installed in a pipe tub, and a low viscosity mortar having a flow value of 200 mm or more is passed through the pipe from the ground. A flow value of less than 200 mm by supplying an additive for increasing the viscosity to the kneading section and kneading the mixture, and injecting the high viscosity mortar into the gap by the pump. A method for rehabilitating existing pipes.   The pump having the kneading section is provided with a region for extruding a fixed amount of mortar, and an inlet for supplying the additive, and a region for kneading the mortar and the additive. The rehabilitation method for existing pipes according to 1.   2. A method for rehabilitating an existing pipe according to claim 1, wherein the pump having the kneading section includes a region for kneading the mortar and the additive and a region for feeding the kneaded high-viscosity mortar forward. .

Images