JP3442664B2 - Sewer renewal method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewer renewal method as a sewer rehabilitation method for rehabilitating a sewer main that has been used or aged.

[0002]

2. Description of the Related Art Sewer pipes are designed on the basis of a flow velocity that allows sediment to flow smoothly (scavenging) to a treatment site without depositing sediment, but in many pipes sediments have existed over the years. It was confirmed that this deposit has various effects on maintenance such as obstruction of downflow capacity, generation of odor, damage to pipes by corrosive substances (hydrogen sulfide, etc.), and contamination of water source by overflow water during rainy days. Is causing problems.

Various measures can be considered as the rehabilitation of such an aged sewer pipe, but the water in the sewer is stopped by a packer (stop cock) or the like to repair the construction part in a dry state. There are many things to do.

[0004]

[Problems to be Solved by the Invention] The contents of repairs include manual scenting and injection of a water blocking material, attachment of a resinous reinforcing material impregnated with a curable resin into a pipe, and others. However, in any case, the work efficiency is poor due to the water stoppage, and if the worker enters the pipe to work, it is necessary to take measures against oxygen deficiency and flood. In particular, when the diameter of the pipe is large, it becomes large.

The present invention eliminates the inconveniences of the above-mentioned conventional examples and enables construction while flowing raw sewage water into the mine,
Sewer that cuts and removes deposits and damaged areas and applies new lining to include this removed area without significantly reducing the diameter, and that continuous work is possible and efficient and rational construction can be obtained. The purpose is to provide the renewal method.

[0006]

Means for Solving the Problems In order to achieve the above object, the present invention firstly forms an inward waterway by opening front and rear ends in an existing sewer main between an upstream shaft and a downstream shaft. With a laterally oriented machine body, a propulsion machine equipped with a cutter device that can cut and remove the lining of the existing sewer main from the inside on the outer periphery of the front end is arranged, and the sewage raw water in the existing sewer system is installed in the water channel of the propulsion machine. Take it in and let it flow, and while cutting the lining of the existing sewer main with a cutter device, move it forward,
After that, the propulsion unit was removed, and after the lining was removed, the sewer was connected in sequence from the upstream shaft, and an insertion pipe was placed and inserted.
As a flow path between the insertion pipe and the existing sewer main
Allow the water to flow at all times, and then insert the sewage raw water into the insertion pipe.
Grouting between the insertion pipe and the existing sewer main, and second, the propulsion unit is divided into a front part and a tail part, each of which is provided with a gripper that presses against the inner surface of the sewer, and the front part Connect the tail parts with a propulsion jack. Third, set the inner formwork pipe with a bulkhead attached to the tip and the pipe launcher at the entrance of the upstream shaft, and pour fresh water into the pipe launcher to The gist is that the inner formwork pipe is propelled by the pressure difference acting on the head, and the inner formwork pipes are sequentially connected in the pipe launcher.

According to the first aspect of the present invention, the propulsion device is moved forward and the lining of the existing sewer main is cut and removed from the inside by the cutter device to cut the deposit and the damaged portion, while the sewage raw water is Take it into the waterway of the propulsion machine and keep flowing. In addition, a new lining can be easily formed by arranging an insertion pipe that is sequentially connected and inserted from an upstream shaft in the sewer after removing the lining and grouting between the insertion pipe and the existing sewer main.

Furthermore, by constantly flowing the sewage raw water by using a flow path between the insertion pipe to be inserted and the existing sewer main,
The sewage raw water does not have to be stopped while forming a new lining after removing the lining.

According to the second aspect of the present invention, in addition to the above-mentioned action, the propulsion device sequentially presses and fixes it to the inner surface of the sewer by the gripper of the tail part to extend the propulsion jack to advance the front part, Next, the gripper of the tail part is made free, and the gripper of the front part sequentially presses and fixes it to the inner surface of the sewer system to reduce the propulsion jack to pull the tail part, and by repeating this in sequence, self-propelled forward movement is possible. .

According to the third aspect of the present invention, since it is possible to throw in fresh water into the pipe launcher and propel the inner formwork pipe by the pressure difference acting on the bulkhead, a separate propulsion mechanism is not required, and the construction is performed. Can also be simplified.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing a pre-process until the lining is removed in the sewer renewal method of the present invention, and a propulsion machine 1 used in the present invention method will be described first.

This propulsion machine 1 has a front part 2 and a tail part 3.
It is a laterally-cylindrical airframe divided into two parts, and the front and rear ends are open to form a water channel 4 inward.

In the front part 2, a cutter device 6 is rotated 360 degrees through a turning device 7 by a rotating operation so that a lining 13 which is a deteriorated lining concrete of an existing sewer main 5 can be cut and removed from the inside around a front end opening. Was set up. Various cutters can be considered as the cutter device 6, but a drum type having a rotary drive mechanism is one example, and the cutting torque can be adjusted according to the properties of the removed concrete.

Further, the propulsion device 1 is provided with an earth discharging conveyor 8 extending over both the front portion 2 and the tail portion 3, an earth collecting skirt 9 is arranged around the front end thereof, and the cutter device 6 is further provided.
An earth discharging ring conveyor 10 that draws a circle so as to surround the earth collecting skirt 9 is provided in the rear of the area. The earth discharging conveyor 8 is directly subjected to cutting misalignment by the earth collecting skirt 9 when the upper portion of the lining 13 is cut by the cutter device 6, and is loaded through the earth discharging ring conveyor 10 when cutting the lower portion. Further, the earth discharging ring conveyor 10 is to load the cutting scrap accumulated on the lower portion of the lining 13 when the cutter device 6 cuts the lower portion of the lining 13 onto the earth discharging ring conveyor 10.

In the illustrated example, the front part 2 has two body rings, and walking grippers 11 for pressing the inner surface of the sewer by the jack 11a and the curved pressing plate 11b are provided at appropriate intervals in the circumferential direction. The walking gripper 11 is a reaction force receiving gripper when the cutter device 6 is changed after cutting.

The tail portion also has two body rings, and the main frame gripper 12 for pressing the inner surface of the sewer by the jack 12a and the curved pressing plate 12b is also provided at appropriate intervals in the circumferential direction. The main frame gripper 12 is a gripper for applying a cutting reaction force to a sound segment after cutting.

The front part 2 and the tail part 3 are movably connected to each other by a propulsion jack 17 which is arranged at an appropriate interval in the circumferential direction.

Although not shown in the drawings, a shuttle car for traveling in a circular cross section for receiving cutting misalignment may be arranged at the rear end of the propulsion unit 1 to carry out the cutting misalignment.
The shuttle car for traveling in a circular cross section can be driven by a rope tow system.

Further, the forward drive of the propulsion unit 1 may be a rope-pulling type instead of the length-adjusting insect type of the walking gripper 11, the main frame gripper 12 and the propulsion jack 17.

In this way, assuming that the existing sewer main 5 is formed between the upstream shaft 14 and the downstream shaft 15 as shown in FIG. 2, the propulsion machine 1 is installed from the upstream shaft 14 to the existing sewer main. The sewage raw water 16 in the existing sewer is taken into the water channel 4 in the propulsion machine 1 and flowed into the water channel 4 in the propulsion device 1, and the cutter device 6 advances the existing sewage main pipe 5 while scraping the lining 13 of the existing sewer main 5.

This forward movement starts with the tail portion 3 of the propulsion unit 1.
Is fixed to the inner surface of the sewer by the main frame gripper 12, the propulsion jack 17 is extended to advance the front part 2, and then the main frame gripper of the tail part 3
12 is free, the front part 2 is pressed and fixed to the inner surface of the sewer by the walking gripper 11, and the propulsion jack 17 is contracted to pull the tail part 3. By repeating this in sequence, the robot advances in a self-propelled manner in the form of a scale insect.

Next, the steps after removal of the lining 13 are shown in FIGS.
It shows in FIG. As shown in FIG. 2, the propulsion device 1 is removed, and the residue and the like left after the removal of the lining 13 is removed while flowing the raw sewage water 16.

As shown in FIG. 3, the bulkhead 18 is attached to the tip.
The inner mold pipe 19 ₁ and the pipe launcher 20 fitted with set at the entrance portion of the upstream side pit 14 as a unit.

As shown in FIG. 4, the pipe launcher 20 is fixed by the back truss 21 on the back of the pipe launcher 20 and the pedestal 22 on the bottom, and the sewage raw water 16 becomes the inner formwork pipe 19 _1.
After removing the lining 13 of the deteriorated concrete and the cab between the inner peripheral surface of the concrete and the cab, the flow is always continued. In addition, the pipe launcher 20 and the inner formwork pipe 19 ₁
Put 23 fresh water inside.

[0025] In this way, 23
They were charged, to promote inner mold pipe 19 ₁ by a pressure difference acting on the bulkhead 18. At this time, the reaction force acting on the side of the pipe launcher 20 is carried by the shaft side wall of the upstream shaft 15 via the back truss 21.

[0026] Since the sewage raw water 16 is prevented from flowing into the formwork pipe 19 ₁ of the pipe launcher 20 even during propulsion, pipe sliding portion, it is necessary to provide a sealing mechanism.

The propulsion is stopped when a space is secured in the pipe launcher 20 where a new inner formwork pipe can be joined. As a stopping mechanism, a mechanical brake is provided in the pipe launcher 20 to grip the outer periphery of the inner formwork pipe.

As shown in FIG. 5, a new inner mold pipe 19 ₂ from the top of the pipe launcher 20 was charged to inner mold pipe 19 ₁ and the joint.

Inject fresh water 23 into the pipe launcher 20,
Raise the water level in the pipe launcher 20, and then the inner formwork pipe 1
Promote 9 ₁ , 19 ₂ . After the prescribed propulsion, stop and hold.

By repeating the above steps, the inner formwork pipes 19 ₁ , 19 ₂ ... Are sequentially connected as shown in FIG. 6, and the sewage raw water 16 is replaced with the inner formwork pipes 19 ₁ , 19 ₂ ... As shown in FIG. Inner formwork pipe while flowing down the gap between sewage segments
Install a total length of up to 19 ₁ , 19 ₂ ... 19 _n .

As shown in FIG. 8, the inner formwork pipes 19 ₁ and 19
_2. After pulling the entire length of pipe up to 19 _n , insert the packer 24 between the outer periphery of the inner formwork pipe 19 _n , which is the final insertion pipe, and the sewer segment, fix the end, and also at the pipe tip part insert the packer 24 between pipe 19 ₁ and sewage segment, fixed.

The bulkhead 18 is removed, the pipe launcher 20, the back truss 21, and the gantry 22 are also removed, and the flow path of the raw sewage water 16 is changed from "between the outer circumference of the insertion pipe and the sewage segment" to a new insertion pipe / inner form pipe. switch to 19 _1, 19 _{2 ...} 19 _n, washed between inner mold pipe 19 _1, 19 _{2 ...} 19 _n and sewage segment Shimizu, to grout between this.

[0033]

As described above, the sewer renewal method of the present invention can be carried out while the raw sewage water is flowing into the mine, and at the same time, the deposits and damaged points are removed by cutting and the new construction is performed. By applying a lining, there is no need to significantly reduce the diameter, and continuous work is possible, resulting in efficient and rational construction.

[Brief description of drawings]

FIG. 1 is a perspective view showing a front process up to removal of a lining in a sewer renewal method according to the present invention.

FIG. 2 is a vertical sectional side view of a first step after removing the lining.

FIG. 3 is a vertical sectional side view of a second step after removing the lining.

FIG. 4 is a vertical sectional side view of a third step after removing the lining.

FIG. 5 is a vertical sectional side view of a fourth step after removing the lining.

FIG. 6 is a vertical sectional side view of a fifth step after removing the lining.

FIG. 7 is a vertical sectional side view of a sixth step after removing the lining.

FIG. 8 is a vertical sectional side view of a seventh step after removing the lining.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Propulsion machine 2 ... Front part 3 ... Tail part 4 ... Water channel 5 ... Existing sewer main 6 ... Cutter device 7 ... Swivel device 8 ... Earth removal conveyor 9 ... Earth collection skirt 10 ... Earth removal ring conveyor 11 ... Walking gripper 11a , 12a ...
Jacks 11b, 12b ... Curved pressing plate 12 ... Main frame gripper 13 ... Lining 14 ... Upstream shaft 15 ... Downstream shaft 16 ... Sewage raw water 17 ... Propulsion jack 18 ... Bulkhead 19 ₁ , 19 ₂ … 19 _n … Inner formwork Pipe 20 ... Pipe Launcher 21 ... Back Truss 22 ... Stand 23 ... Shimizu 24 ... Packer

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-78992 (JP, A) JP-A 64-17937 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/00-11/40 E03F 7/00

Claims (3)

(57) [Claims] 1. A horizontal cylindrical airframe with front and rear ends open to form an inward waterway in the existing sewer main between the upstream shaft and the downstream shaft, and the existing sewer main is lined on the outer periphery of the front end. Arrange a propulsion machine equipped with a cutter device that can be cut and removed from the inside, take in the sewage raw water in the existing sewer into the water channel in the propulsion device and let it flow, and move forward while scraping the lining of the existing sewer main with the cutter device. After that, the propulsion unit is removed, and the sewage after the lining is removed is placed by inserting the insertion pipes that are sequentially connected from the upstream shaft.
Sewage raw water is used as a flow path between the insertion pipe and the existing sewer main.
Allow it to flow at all times, and then insert the sewage raw water flow path into the insertion pipe.
A sewer renewal method characterized by switching and grouting between the insertion pipe and the existing sewer main. 2. The propulsion device is divided into a front part and a tail part, each of which is provided with a gripper for pressing the inner surface of the sewer,
The sewer renewal method according to claim 1, wherein the front portion and the tail portion are connected by a propulsion jack. 3. An inner formwork pipe having a bulkhead attached to the tip and a pipe launcher are set at the entrance of an upstream shaft, and fresh water is introduced into the pipe launcher, and the inner formwork pipe is caused by the pressure difference acting on the bulkhead. 3. The sewer renewal method according to claim 1 or 2, wherein the inner formwork pipes are sequentially connected in the pipe launcher.