阅读说明：本技术 一种用于替代圆形衬管的梅花瓣状衬管地下管道修复工艺 (Plum petal-shaped liner tube underground pipeline repairing process for replacing circular liner tube ) 是由 戚慎 乐其军 于 2020-04-24 设计创作，主要内容包括：本发明公开了一种用于替代圆形衬管的梅花瓣状衬管地下管道修复工艺,包括如下步骤：S1：将梅花状衬管经牵引设备安装于原旧地下管道中；S2：在梅花状衬管两端分别各安装一只用于密封的梅花状衬管堵头；S3：在其中一只梅花状衬管堵头上安装有注高压气体或高压水接头,以及排气或排水螺塞；S4：当梅花状衬管安装完毕,通过注高压气体或高压水接头向梅花状衬管注入高压气体或高压水,梅花状衬管在高压气体或高压水的作用下逐步展开直至紧贴原旧地下管道内壁；本发明采用梅花形管道作为衬管后使衬管实际外径极大缩小,使衬管外径与被修复的管道内径保持较大的间隙,这样极大降低了牵引力,有效消除了由于过大的牵引力而造成衬管损坏的隐患。(The invention discloses a plum petal-shaped liner tube underground pipeline repairing process for replacing a circular liner tube, which comprises the following steps: s1: installing the plum blossom-shaped liner tube in an original underground pipeline through traction equipment; s2: two ends of the plum blossom-shaped liner tube are respectively provided with a plum blossom-shaped liner tube plug for sealing; s3: one of the plum blossom-shaped lining pipe plugs is provided with a high-pressure gas or high-pressure water injection joint and an exhaust or drainage screw plug; s4: when the quincunx liner pipe is installed, high-pressure gas or high-pressure water is injected into the quincunx liner pipe through a high-pressure gas or high-pressure water joint, and the quincunx liner pipe is gradually unfolded under the action of the high-pressure gas or the high-pressure water until the quincunx liner pipe is tightly attached to the inner wall of the original underground pipeline; the invention adopts the quincunx pipeline as the liner pipe, so that the actual outer diameter of the liner pipe is greatly reduced, and a larger gap is kept between the outer diameter of the liner pipe and the inner diameter of the repaired pipeline, thereby greatly reducing the traction force and effectively eliminating the hidden trouble of liner pipe damage caused by overlarge traction force.)

1. A plum blossom petal form liner tube underground pipe repairing process for replacing circular liner tube, which is characterized in that: the method comprises the following steps:

s1: installing the plum blossom-shaped liner tube (3) in the original underground pipeline (2) through traction equipment;

s2: two ends of the plum blossom-shaped liner tube (3) are respectively provided with a plum blossom-shaped liner tube plug (4) for sealing;

s3: a high-pressure gas or high-pressure water injection joint (5) and an exhaust or drainage screw plug (6) are arranged on one of the plum blossom-shaped lining pipe plugs (4);

s4: when the quincunx liner tube (3) is installed, high-pressure gas or high-pressure water is injected into the quincunx liner tube (3) through a high-pressure gas or high-pressure water joint (5), and the quincunx liner tube (3) is gradually unfolded under the action of the high-pressure gas or the high-pressure water until the quincunx liner tube is tightly attached to the inner wall of the original underground pipeline (2);

s5: and at the moment, the pipeline can be continuously pressurized until the pressure is tested, and the pressure is maintained according to the time required by the pressure test condition, so that the sealing performance of the repaired pipeline is tested.

2. The repair process of an underground pipeline with a plum petal-shaped liner pipe used for replacing a circular liner pipe as claimed in claim 1, wherein the repair process comprises the following steps: the surface of the plum blossom-shaped liner tube (3) is provided with a plurality of groups of arc-shaped bulges (3-1) arranged at equal intervals, and arc-shaped grooves (3-2) are arranged between the arc-shaped bulges (3-1).

3. The repair process of an underground pipeline with a plum petal-shaped liner pipe used for replacing a circular liner pipe as claimed in claim 1, wherein the repair process comprises the following steps: and the old underground pipeline (2) is buried in the underground pipeline buried layer (1).

Technical Field

The invention belongs to the technical field of underground pipeline repair, and particularly relates to a plum petal-shaped liner tube underground pipeline repair process for replacing a circular liner tube.

Background

Urban underground pipeline doors are various in types and are criss-cross, especially, conveying pipelines such as tap water pipelines and heating pipelines have certain pressure, the pipelines are damaged due to construction problems or due to long-term overhaul to cause leakage failure, and if the pipelines are re-laid, a large amount of manpower, material resources and other social resources are input, and the production, life, traveling and environment of people in a construction area are greatly influenced. At present, in order to overcome the problems, the original damaged pipeline is lined with a nylon or stainless steel liner pipe, excavation is not needed after the method is adopted, and the original pipeline is reused. The liner tube is reinforced due to the reutilization of the original pipeline, so that the purpose of repairing the original damaged pipeline is achieved, the compressive strength of the liner tube is ensured, and a large amount of maintenance cost is saved.

At present, the liner pipe of the underground pipeline is generally made of metal or nylon pipe with the outer diameter basically equal to the inner diameter of the repaired pipeline, but the main construction process is carried out below the ground, the preprocessed pipeline needs to be penetrated from one end of the damaged underground pipeline to be repaired during construction, and the liner pipe for repairing is pulled to the traction end by traction equipment at the other end of the pipeline, so that the purpose of repairing the original damaged pipeline is achieved. Because each section of the underground pipeline is about 300 meters generally, the traction resistance of the underground pipeline is larger and larger as the liner pipe gradually enters the repaired pipeline under the traction action of the traction equipment, and particularly when the original pipeline has a curve, the traction resistance of the underground pipeline is obviously increased to different degrees along with the curvature change of the original pipeline. In actual conditions, most of the original pipelines are bent to different degrees due to the influence of construction conditions. Excessive traction has a great influence on construction quality, and can cause tearing of the welding seam of the liner pipe in serious conditions, thereby bringing immeasurable loss. The invention makes the repair liner tube into a quincunx shape, the cross section of the repair liner tube is formed by connecting a certain number of curves, when the sum of the lengths of the curves is equal to the circumference of a circle (the circle can be regarded as the inner diameter of the pipeline to be repaired), the maximum outer diameter of the quincunx pipeline is smaller than the circle, and the outer surface area of the quincunx pipeline with equal length is the same as the inner surface area of the pipeline to be repaired with equal length. Therefore, when the quincunx pipeline with the same length and the same surface area as the surface area of the pipeline to be repaired is used as the liner pipe, the traction force is far smaller than that of a circular liner pipe. When the quincunx liner tube is installed, the quincunx liner tube is expanded by high-pressure gas or high-pressure water, and the surface area of the quincunx pipeline with the length equal to that of the pipeline to be repaired is the same as the inner surface area of the pipeline to be repaired, so that the quincunx pipeline is tightly attached to the inner wall of the pipeline to be repaired in a mechanical large stretching state after being expanded.

Disclosure of Invention

The invention aims to provide a quincunx pipeline as a liner pipe aiming at the defect that the liner pipe adopted by the existing underground pipeline repairing has overlarge traction force. The traction force is greatly reduced after the quincunx pipeline is used as the liner tube, the hidden danger that the liner tube is damaged due to the overlarge traction force is effectively eliminated, the construction quality is greatly improved, and meanwhile, the working efficiency is also obviously improved. The improvement effect can be calculated as follows.

The following two factors are mainly influenced by the liner traction force:

1. compressive stress on the exterior surface of the liner and the interior surface of the pipeline being rehabilitated;

2. the liner's own weight.

The tractive force resulting from the compressive stress on the outer surface of the liner and the inner surface of the pipe being rehabilitated can be calculated as follows:

p = f pressure pi dlp (kilogram) (formula I)

In the formula

f pressure- -coefficient of friction at press

d- -nominal diameter of the mating surface [ mm ]

l- -pressing length [ mm ]

Compressive stress [ kilogram/millimeter ] on p-mating surface can be calculated according to the following formula

p =·10²/(C1/E1＋C₂/E₂) d (kilogram force/millimeter) stand-by

C₁=(d²＋d0²)/(d²-d0²)-μ₁, ( D²＋d²)/( D²-d²) ＋μ₂

d0- -inner bore diameter of the enclosed item [ mm ]

D- -diameter of the outer circle of the containment piece [ mm ]

E₁And E₂- - - -contained member and elastic modulus of contained member [ kilogram force/mm ]

μ₁And mu₂- -Person's modulus of the contained and containing elements

- - - -calculate the interference [ mu ] m

The compressive stress on the outer surface of the liner and the inner surface of the pipe being rehabilitated is illustrated in figures 3 and 4;

the drag produced by the liner's own weight can be calculated as follows:

fm = μ 0N (formula two)

In the formula

fm- - -maximum static friction force

Mu 0- - -coefficient of static friction

N-positive pressure

The self weight force diagram of the circular liner tube is shown in figures 5 and 6; the quincunx liner tube self weight is illustrated in figures 7 and 8.

Setting the maximum traction force of the circular liner tube to be Ty, and as can be seen from the force diagrams of FIGS. 3-6, the maximum traction force of the circular liner tube is:

Ty=P＋F(F＞fm)

the quincunx liner pipe traction is set to be Tm, as can be seen from fig. 7-8, the maximum traction of the quincunx liner pipe is as follows:

Tm=F(F＞fm)

comparing the maximum traction Ty of the circular liner tube with the traction Tm of the quincunx liner tube

Ty- Tm= ( P＋F)-F

Ty- Tm=P

It can be easily seen that the traction force of the circular liner tube is greater than that of the quincunx liner tube, and the difference is P. The P value is the traction force generated by the compressive stress on the outer surface of the liner and the inner surface of the repaired pipe. The traction force generated by the compressive stress on the outer surface of the liner and the inner surface of the repaired pipe is:

p = f pressure pi dlp (kilogram) (formula I)

Where the value of p (compressive stress on the mating surfaces) is an indeterminate value. He is influenced by the value of (calculated interference) because the inner surface of the repaired pipeline is distributed with raised metal tumors caused by corrosion after the repaired pipeline is used for a long time, and the metal tumors are distributed unevenly and have different sizes. These nodules have in fact changed the internal diameter of the pipe being repaired, increasing the interference, i.e. traction, to a different extent. And these metal nodules can easily damage the liner during pulling.

(formula one) is shown in a handbook of metal machining technologists (Shanghai science and technology Press) P1033.

The technical scheme of the invention is as follows: a plum petal-shaped liner tube underground pipeline repairing process for replacing a circular liner tube comprises the following steps:

s1: installing the plum blossom-shaped liner tube in an original underground pipeline through traction equipment;

s2: two ends of the plum blossom-shaped liner tube are respectively provided with a plum blossom-shaped liner tube plug for sealing;

s3: one of the plum blossom-shaped lining pipe plugs is provided with a high-pressure gas or high-pressure water injection joint and an exhaust or drainage screw plug;

s4: when the quincunx liner pipe is installed, high-pressure gas or high-pressure water is injected into the quincunx liner pipe through a high-pressure gas or high-pressure water joint, and the quincunx liner pipe is gradually unfolded under the action of the high-pressure gas or the high-pressure water until the quincunx liner pipe is tightly attached to the inner wall of the original underground pipeline;

s5: and at the moment, the pipeline can be continuously pressurized until the pressure is tested, and the pressure is maintained according to the time required by the pressure test condition, so that the sealing performance of the repaired pipeline is tested.

Compared with the prior art, the invention has the beneficial effects that: the invention adopts the quincunx pipeline as the liner pipe, so that the actual outer diameter of the liner pipe is greatly reduced, and a larger gap is kept between the outer diameter of the liner pipe and the inner diameter of the repaired pipeline, thereby greatly reducing the traction force, effectively eliminating the hidden trouble of liner pipe damage caused by the overlarge traction force, ensuring the construction quality and obviously improving the working efficiency. The quincunx pipeline can be expanded and unfolded and combined with the liner pipe to perform sealing performance testing.

Drawings

FIG. 1 is a front view of an underground pipe rehabilitation;

FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;

FIG. 3 is a pressure stress diagram of the outer surface of the liner and the inner surface of the pipe being rehabilitated;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a graph of the liner tube's own weight;

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a diagram of the own weight of the quincunx liner;

FIG. 8 is a side view of FIG. 7;

FIG. 9 is a perspective view of a quincunx liner;

figure 10 is a side view of a quincunx liner.

In the figure: the underground pipeline comprises an underground pipeline filling layer 1, an old underground pipeline 2, a plum blossom-shaped liner tube 3, a plum blossom-shaped liner tube plug 4, a high-pressure gas or high-pressure water injection joint 5, an exhaust or drainage screw plug 6, a round liner tube 7, an arc-shaped bulge 3-1 and an arc-shaped groove 3-2.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-10, a plum petal-shaped liner tube underground pipe repairing process for replacing a circular liner tube comprises the following steps:

s1: installing the plum blossom-shaped liner tube 3 in the old underground pipeline 2 through traction equipment;

s2: two ends of the plum blossom-shaped liner tube 3 are respectively provided with a plum blossom-shaped liner tube plug 4 for sealing;

s3: a plug 4 of one of the quincuncial liner tubes is provided with a joint 5 for injecting high-pressure gas or high-pressure water and an exhaust or drainage screw plug 6;

s4: when the quincunx liner tube 3 is installed, high-pressure gas or high-pressure water is injected into the quincunx liner tube 3 through the high-pressure gas or high-pressure water injection joint 5, and the quincunx liner tube 3 is gradually unfolded under the action of the high-pressure gas or the high-pressure water until the quincunx liner tube is tightly attached to the inner wall of the original underground pipeline 2;

s5: and at the moment, the pipeline can be continuously pressurized until the pressure is tested, and the pressure is maintained according to the time required by the pressure test condition, so that the sealing performance of the repaired pipeline is tested.

Specifically, a plurality of groups of arc-shaped bulges 3-1 are equidistantly arranged on the surface of the plum-blossom-shaped liner tube 3, and arc-shaped grooves 3-2 are arranged among the arc-shaped bulges 3-1.

Specifically, the old underground pipeline 2 is buried in the underground pipeline buried layer 1.

In conclusion, compared with the prior art, the method has the advantages that the actual outer diameter of the liner tube is greatly reduced after the quincunx pipeline is adopted as the liner tube, and a larger gap is kept between the outer diameter of the liner tube and the inner diameter of the repaired pipeline, so that the traction force is greatly reduced, the hidden danger of liner tube damage caused by the overlarge traction force is effectively eliminated, the construction quality is ensured, and meanwhile, the working efficiency is obviously improved. The quincunx pipeline can be expanded and unfolded and combined with the liner pipe to perform sealing performance testing.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.