CN109305780B - Pipeline spraying repair material, preparation method and construction process for pipeline repair by using pipeline spraying repair material - Google Patents

Abstract

The invention discloses a pipeline spraying repair material, a preparation method and a construction process for repairing a pipeline by using the material, wherein the repair material is prepared from the following raw materials in parts by weight: 40-60 parts of a cementing material, 45-70 parts of aggregate, 3-9 parts of dispersible latex powder, 3-10 parts of a fiber material, 2-6 parts of a water-retaining agent, 1-3.5 parts of an accelerator, 2-6 parts of an underwater curing agent, 0.4-1.2 parts of a water reducing agent, 2-6 parts of a stabilizer and 25-35 parts of water. The process can be used for construction in a humid or water-carrying environment, and the construction cost in pipeline repair is greatly reduced. The water-saving pipeline can be used under the condition that water exists in the pipeline, and is less interfered by the environment. The construction process can adopt a trenchless repairing mode to finish repairing operation, thereby reducing the manufacturing cost and other obstacles in the maintenance process. The problem of leakage of underground pipelines can be efficiently solved, and traffic jam can not be caused. The repairing construction result is satisfactory, the surface of the repaired pipeline is uniform in thickness, smooth and flat, and good in impermeability and corrosion resistance, and the actual operation of the underground pipeline can be met.

Description

Pipeline spraying repair material, preparation method and construction process for pipeline repair by using pipeline spraying repair material

Technical Field

The invention relates to the field of spraying mortar, in particular to a pipeline spraying repair material, a preparation method and a construction process for repairing a pipeline by using the material.

Background

The urban drainage system is an important link in urban rainwater drainage, water pollution control and water ecological environment protection systems, and is an important infrastructure for ensuring urban survival and sustainable development. The pipeline system plays a vital role in the life of urban residents, brings great convenience to the life of the residents, and is also an indispensable important infrastructure for urban development. With the advance of economic flight and urbanization process in China, the number and the length of buried pipelines are rapidly increased along with the lapse of time.

The drainage pipe network is a 'city vein', undertakes the tasks of urban sewage collection and rainwater transportation, and is the basis of safe and stable operation of cities. Once the drainage pipeline is damaged, the daily life of urban residents can be affected, and even serious consequences such as ground collapse and traffic influence can be caused. Therefore, the repair work of the drain line is necessary and imperative.

At present, two main materials for spraying and repairing the domestic drainage pipeline are provided, namely cement mortar and epoxy resin. However, the cement mortar is easy to generate micro cracks, so that the repair effect is influenced, and even the pipe explosion phenomenon is caused, the epoxy resin can only perform functional repair on the pipeline and cannot achieve the structural repair effect, in the repair process, the pipe wall must be completely dried, ultraviolet curing is needed after spraying, the construction link is complex, and the working hours are influenced.

The spraying repair of the pipeline is underground operation, the requirements on construction equipment and spraying repair materials are high, the spraying repair materials need to be good in cohesiveness with the original pipe wall and tightly attached, meanwhile, a continuous integrated structure can be formed, various requirements such as corrosion resistance, impermeability and pressure resistance are needed, meanwhile, in order to achieve rapid construction, the repair materials need to meet the requirements of operation with water, and can be rapidly solidified without special maintenance. Therefore, it is necessary to research a repair material, which can meet the above requirements and realize the full-mechanized rapid construction of pipeline spraying repair.

Disclosure of Invention

The invention aims to provide a pipeline spraying repair material, a preparation method and a construction process for repairing a pipeline by using the material, and aims to solve the technical problems of difficult pipeline repairing construction, long construction period, high risk of construction water-carrying operation, high cost and unsatisfactory effect.

In order to achieve the purpose, the invention adopts the following technical scheme: one aspect of the invention provides a pipeline spraying repair material, which consists of the following raw materials in parts by weight: 40-60 parts of a cementing material, 45-70 parts of aggregate, 3-9 parts of dispersible latex powder, 3-10 parts of a fiber material, 2-6 parts of a water-retaining agent, 1-3.5 parts of an accelerator, 2-6 parts of an underwater curing agent, 0.4-1.2 parts of a water reducing agent, 2-6 parts of a stabilizer and 25-35 parts of water.

Further, the cementing material comprises cement, fly ash and silica fume; wherein the mass ratio of the cement to the fly ash to the silica fume is 16-24: 3-6: 1-3.

Further, the aggregate is quartz sand.

Further, the particle sizes of the quartz sand are respectively 300 meshes, 200 meshes, 0.2mm, 0.6mm, 1mm, 1.2mm, 1.5mm and 2 mm; the cumulative screen allowance of the quartz sand is 5-7%, 10-15%, 17-22%, 23-33%, 35-45%, 50-67%, 73-86% and 100%.

Further, the fiber material is wood fiber and polypropylene fiber.

Further, the mass ratio of the wood fibers to the polypropylene fibers is 1-3: 1-3.

Further, the water-retaining agent includes cellulose ether and starch ether. The mass ratio of the cellulose ether to the starch ether is 1: 1.

further, the cellulose ether is one or more of hydroxymethyl cellulose ether, hydroxypropyl methyl cellulose ether and hydroxyethyl cellulose ether.

Further, the starch ether is carboxymethyl starch ether and/or hydroxypropyl starch ether.

Further, the accelerating agent is aluminum oxide clinker; the aluminous clinker comprises sodium chlorate, sodium carbonate and quick lime, wherein the mass ratio of the sodium chlorate to the sodium carbonate to the quick lime is 1:1: 0.5. The aluminum oxide clinker is powdery, and has the granularity as follows: sieve with 80 μm holes, the screen residue is less than 10%.

Further, the underwater curing agent includes aromatic amine, alkylphenol and aldehyde. The ratio of aromatic amine, alkyl phenol and aldehyde substance is 1:2: 1.

Further, the water reducing agent is lignosulfonate or naphthalene sulfonate formaldehyde polymer or sulfonated melamine formaldehyde resin or carboxylic acid polymer.

Further, the stabilizer is 2, 6-di-tert-butyl-4-methylphenol.

The invention also provides a preparation method of the pipeline spraying repair material, which comprises the following steps:

firstly, preparing materials, namely weighing a cementing material, aggregate, dispersible latex powder, a fiber material, a water-retaining agent, an accelerator, an underwater curing agent, a water reducing agent, a stabilizer and water according to a proportion for later use;

secondly, adding the cementing material and the aggregate into a stirrer, and uniformly stirring; adding the fiber material and the dispersible latex powder and continuing stirring;

step three, after the mixture obtained in the step two is uniformly stirred, sequentially adding an accelerator, an underwater curing agent and a stabilizer, and continuously stirring;

dividing the level weighed in the first step into two parts, mixing the first part of water with a water reducing agent, and pouring the mixture into a stirrer for stirring;

and step five, gradually adding the second part of water in the stirring process of the step four and fully stirring to obtain the repair material.

The invention also provides a construction process for repairing a pipeline by using the pipeline spraying repair material capable of working with water, which comprises the following specific steps:

firstly, determining a leakage or corrosion part of an underground pipeline according to the site topographic conditions and the surrounding environment of the pipeline, detecting along the pipe diameter direction, and determining a pipe section for spraying;

secondly, performing precipitation desilting, cleaning and pipe wall pretreatment on a pipe section to be sprayed;

thirdly, preparing a repairing material;

fourthly, spraying the prepared repairing material on the inner wall of the drainage pipeline through a centrifugal spraying machine;

fifthly, after 24 hours, carrying out flaw detection by using detection equipment, rechecking the thickness, surface roughness, surface flatness and crack condition of the spraying layer on the inner wall of the repaired pipeline, and carrying out evaluation and analysis;

and sixthly, repeating the fourth step if the inner wall of the repaired pipeline does not reach the standard.

The invention has the beneficial effects that:

the pipeline spraying repair material, the preparation method and the construction process for repairing the pipeline by using the material can be used for construction in a humid or water-carrying environment, and the construction cost in pipeline repair is greatly reduced. The water-saving pipeline can be used under the condition that water exists in the pipeline, and is less interfered by the environment. The construction process can adopt a trenchless repairing mode to finish repairing operation, thereby reducing the manufacturing cost and other obstacles in the maintenance process. The problem of leakage of underground pipelines can be efficiently solved, and traffic jam can not be caused.

2, the pipeline spraying repair material, the preparation method and the construction process for repairing the pipeline by using the material provided by the invention have ideal pipeline repairing effect, adopt the quartz sand with good gradation as the aggregate, adopt the cement, the silica powder and the fly ash as the cementing material, simultaneously add the additive to improve the workability of slurry construction and the rheological property of mortar, the slurry of the material is not layered, isolated and weeping, the bonding property is good after being sprayed on the pipe wall, and the phenomenon of slurry rebound and weeping is less.

3, the pipeline spraying repair material, the preparation method and the construction process for repairing the pipeline by using the material can really realize rapid mechanical construction, and meanwhile, the spraying repair material can be tightly combined with the original pipeline to form a continuous integrated structure and has excellent mechanical property, corrosion resistance and impermeability.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The primary objects and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof.

Detailed Description

The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and illustrating the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.

One aspect of the invention provides a pipeline spraying repair material, which consists of the following raw materials in parts by weight: 40-60 parts of a cementing material, 45-70 parts of aggregate, 3-9 parts of dispersible latex powder, 3-10 parts of a fiber material, 2-6 parts of a water-retaining agent, 1-3.5 parts of an accelerator, 2-6 parts of an underwater curing agent, 0.4-1.2 parts of a water reducing agent, 2-6 parts of a stabilizer (which can be 2, 6-di-tert-butyl-4-methylphenol) and 25-35 parts of water.

Wherein the cementing material comprises cement, fly ash and silica fume; wherein the mass ratio of the cement to the fly ash to the silica fume is 16-24: 3-6: 1-3.

Wherein the aggregate is quartz sand; the particle sizes of the quartz sand are respectively 300 meshes, 200 meshes, 0.2mm, 0.6mm, 1mm, 1.2mm, 1.5mm and 2 mm; the cumulative screen allowance of the quartz sand is 5-7%, 10-15%, 17-22%, 23-33%, 35-45%, 50-67%, 73-86% and 100%.

Wherein the fiber material is wood fiber and polypropylene fiber; the mass ratio of the wood fiber to the polypropylene fiber is 1-3: 1-3. The fibrous material may increase the tensile strength of the material.

The gelled material and the aggregate material form a main body of the fiber composite material, provide a substrate for other materials to play a role, and can improve the compressive strength and the corrosion resistance of the fiber composite material.

Wherein the water retention agent comprises cellulose ether and starch ether; the mass ratio of the cellulose ether to the starch ether is 1: 1; the cellulose ether is one or more of hydroxymethyl cellulose ether, hydroxypropyl methyl cellulose ether and hydroxyethyl cellulose ether. The starch ether is carboxymethyl starch ether and/or hydroxypropyl starch ether.

Wherein the accelerating agent is aluminum oxide clinker; the aluminous clinker comprises sodium chlorate, sodium carbonate and quick lime, wherein the mass ratio of the sodium chlorate to the sodium carbonate to the quick lime is 1:1: 0.5. The aluminum oxide clinker is powdery, and has the granularity as follows: sieve with 80 μm holes, the screen residue is less than 10%.

The underwater curing agent comprises aromatic amine, alkylphenol and aldehyde substances, wherein the ratio of the aromatic amine to the alkylphenol to the aldehyde substances is 1:2: 1.

Wherein the water reducing agent is lignosulfonate or naphthalene sulfonate formaldehyde polymer or sulfonated melamine formaldehyde resin or carboxylic acid polymer.

The following examples 1-10 are provided to specifically illustrate the components of the spray repair material for a pipeline. See table 1 below.

TABLE 1 details of the components of examples 1-10 (unit: parts by weight)

Description of materials: the materials adopted by the invention are all sold in the market, and other types of cement can be used. In examples 1 to 10, the cellulose ether was a hydroxymethyl cellulose ether and the starch ether was a carboxymethyl starch ether.

The specific preparation method of the pipeline spraying repair material comprises the following steps:

firstly, preparing materials, namely weighing a cementing material, aggregate, dispersible latex powder, a fiber material, a water-retaining agent, an accelerator, an underwater curing agent, a water reducing agent, a stabilizer and water according to a proportion for later use;

secondly, adding the cementing material and the aggregate into a stirrer, and uniformly stirring; adding the fiber material and the dispersible latex powder and continuing stirring;

step three, after the mixture obtained in the step two is uniformly stirred, sequentially adding an accelerator, an underwater curing agent and a stabilizer, and continuously stirring;

fourthly, horizontally dividing the water weighed in the first step into two parts, mixing the first part of water with a water reducing agent, and pouring the mixture into a stirrer for stirring;

and step five, gradually adding the second part of water in the stirring process of the step four and fully stirring to obtain the repair material.

Further performance tests were performed on the repair materials obtained in examples 1-10, and the test results are shown in table 2 below:

TABLE 2 results of the Performance test of examples 1-10

From table 2 above, it can be seen that:

firstly, the average initial setting time of the pipeline spraying repair material provided by the invention is 27.3min, which shows that the material can be solidified in a short time, and the quick-drying and no-flow pulp can be achieved during spraying;

secondly, the average slump is 40.7mm, which shows that the fluidity of the pipeline spraying repair material provided by the invention is low, and the pipeline can be quickly attached to the original pipe wall during spraying;

thirdly, the compressive strength, the tensile strength and the flexural strength are far higher than those of similar repair materials, which shows that the pipeline spraying repair material provided by the invention has good mechanical properties and plays a certain reinforcing role in pipeline repair;

fourthly, the average value of the bonding tensile strength is 6.2MPa, which shows that the pipeline spraying repair material provided by the invention has good bonding performance and can be tightly attached to the wall of the original pipe;

fifthly, the water permeability coefficient is 0, which indicates that the material has good anti-permeability performance after repairing the pipeline;

and sixthly, after the corrosion resistance test, the test piece has no phenomena of looseness, stripping and pitting, which shows that the pipe has excellent corrosion resistance after being repaired. Tests prove that the material can repair the pipeline under the condition of water, and the influence of abnormal operation of the drainage pipeline caused by water cut-off construction is reduced.

Description of the test:

(1) and (3) testing the setting time: the test was carried out in a laboratory at a temperature of (20 ℃ C., 3) and a relative humidity of 60% or more. Preparing mortar according to a standard method, adding only a cementing material and other additives during material mixing, not adding quartz sand, preparing cement paste, immediately filling a round mold once after the material mixing, inserting and smashing for a plurality of times by using a slotting tool, scraping, and then putting into a wet curing box for curing. The time to start the addition of the mix water was recorded as the start time of the setting time. The test piece is maintained in a wet maintenance box until 30min after adding the mixed water, and the first measurement is started.

During measurement, the round die is taken out of the wet maintenance box and placed under the test needle, the test needle is in contact with the surface of the clean slurry, the screw is tightened for 1S-2S and then suddenly loosened, the test needle vertically and freely sinks into the clean slurry, and the pointer reading is observed when the test needle stops sinking. When the test needle sinks to a distance of 2mm-3mm from the bottom plate, the clean slurry reaches an initial setting state; when the settlement is not more than 1mm-0.5mm, the final setting state of the slurry is achieved. The initial setting time and the final setting time of the net slurry are respectively the time from the beginning of adding the mixing water to the initial setting state and the time from the final setting state.

(2) Slump test: the test was carried out using a steel round-table-shaped cylinder having an inner diameter of 50. + -. 0.5mm at the upper end, an inner diameter of 100. + -. 0.5mm at the lower end, a height of 150. + -. 0.5mm and a thickness of 2mm to 3mm, and was carried out in a test room at a temperature of 20 ℃ 3 and a relative humidity of 60% or more.

Mortar was prepared as specified. The slump cone is placed on a horizontally placed steel plate, the mixed mortar is equally divided into two layers for pouring, each layer is uniformly inserted and tamped in the cone from the edge to the center according to a spiral shape by a tamping rod, each layer is tamped for 15 times, and the inserting rod is inserted into the front layer to a depth of 4mm when the second layer is inserted and tamped. The inner wall of the slump cone and the surface of the steel plate were wiped clean and kept wet before use with a wringed-out damp cloth. After the upper surface of the filled mortar was flush with the upper edge of the slump cone, trowel was used to level and remove the material around the circumference of the cone, the slump cone was gently lifted vertically and gently placed next to the mortar, and the slump test was started when the polymer mortar basically stopped slump downward. And measuring the height difference between the top center point of the polymer mortar and the slump cone by using a steel ruler, namely obtaining the slump value.

(3) And (3) testing the compression strength and the rupture strength: prismatic test blocks with dimensions of 40mm x 160mm were prepared for testing the flexural strength, and the test blocks for testing the compressive strength were two broken blocks after the flexural test. And (4) performing a flexural strength test and a compressive strength test according to a standard method, respectively recording the breaking load, and converting the breaking load into the compressive strength and the flexural strength.

(4) And (3) testing tensile strength: the 8-shaped mortar test piece is adopted for the test, and the tensile strength is realized.

(5) Bonding tensile strength test: manufacturing test pieces with two sizes according to the specification, wherein the upper layer size is 40mm by 10 mm; the lower layer size was 70mm 20mm and the bond tensile strength was tested.

(6) And (3) testing the impermeability: a truncated cone with the top diameter of 175mm, the bottom diameter of 185mm and the height of 150mm is manufactured, and the impermeability of the material is tested by a water seepage height method.

(7) And (3) corrosion resistance testing: manufacturing a 40mm by 160mm prism test block, soaking the test block in domestic sewage, observing whether the surface of the test block has loose peeling and pitting phenomena or not at 3d, 7d, 14d and 28d respectively, and testing the flexural strength and the compressive strength.

The construction process for repairing the pipeline by using the pipeline spraying repair material comprises the following specific steps:

firstly, determining a leakage or corrosion part of an underground pipeline according to the site topographic conditions and the surrounding environment of the pipeline, detecting along the pipe diameter direction, and determining a pipe section for spraying;

secondly, performing precipitation desilting, cleaning and pipe wall pretreatment on a pipe section to be sprayed;

thirdly, preparing a repairing material;

fourthly, spraying the prepared repairing material on the inner wall of the drainage pipeline through a centrifugal spraying machine;

fifthly, after 24 hours, carrying out flaw detection by using detection equipment, rechecking the thickness, surface roughness, surface flatness and crack condition of the spraying layer on the inner wall of the repaired pipeline, and carrying out evaluation and analysis;

and sixthly, repeating the fourth step if the inner wall of the repaired pipeline does not reach the standard.

The pipeline repairing materials provided by the embodiments 1-10 are subjected to pipeline repairing, and the repairing results are detected, so that the repaired pipeline is dense in the repaired position, free of loosening and shedding phenomena and free of water seepage phenomena when the repaired pipeline runs for 2 hours, 24 hours, 5 days, 10 days, 15 days and 28 days respectively in apparent appearance. The repairing material provided by the invention is used for pipeline repairing construction, the result is satisfactory, the repaired pipeline surface is uniform in thickness, smooth and flat, and good in anti-permeability performance and corrosion resistance, and the actual operation requirement of the underground pipeline is met.

In conclusion, the pipeline spraying repair material, the preparation method and the construction process for repairing the pipeline by using the material provided by the invention can be used for spraying and repairing the pipeline under the condition that the underground pipeline runs. After the repair construction is finished, the operation condition of the repaired pipeline can be monitored by utilizing detection means such as pipeline robots and the like. The detection effect is good, and the popularization value is high.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.

Claims (5)

1. Pipeline spraying repair material, its characterized in that: the repair material is composed of the following raw materials in parts by weight: 40-60 parts of a cementing material, 45-70 parts of aggregate, 3-9 parts of dispersible latex powder, 3-10 parts of a fiber material, 2-6 parts of a water-retaining agent, 1-3.5 parts of an accelerator, 2-6 parts of an underwater curing agent, 0.4-1.2 parts of a water reducing agent, 2-6 parts of a stabilizer and 25-35 parts of water;

the cementing material comprises cement, fly ash and silica fume; wherein the mass ratio of the cement to the fly ash to the silica fume is 16-24: 3-6: 1-3;

the aggregate is quartz sand;

the fiber material is wood fiber and polypropylene fiber;

the water retention agent comprises cellulose ether and starch ether;

the accelerating agent is aluminum oxide clinker; the aluminous clinker comprises sodium chlorate, sodium carbonate and quick lime, wherein the mass ratio of the sodium chlorate to the sodium carbonate to the quick lime is 1:1: 0.5.

2. The pipeline spray repair material of claim 1 wherein the cellulose ether is one or more of a hydroxymethyl cellulose ether, a hydroxypropyl methyl cellulose ether and a hydroxyethyl cellulose ether.

3. The pipeline spray repair material of claim 1, wherein the starch ether is carboxymethyl starch ether and/or hydroxypropyl starch ether.

4. The method for preparing a pipe spray repair material according to any one of claims 1 to 3, comprising the steps of:

firstly, preparing materials, namely weighing a cementing material, aggregate, dispersible latex powder, a fiber material, a water-retaining agent, an accelerator, an underwater curing agent, a water reducing agent, a stabilizer and water according to a proportion for later use;

secondly, adding the cementing material and the aggregate into a stirrer, and uniformly stirring; adding the fiber material and the dispersible latex powder and continuing stirring;

step three, after the mixture obtained in the step two is uniformly stirred, sequentially adding an accelerator, an underwater curing agent and a stabilizer, and continuously stirring;

dividing the level weighed in the first step into two parts, mixing the first part of water with a water reducing agent, and pouring the mixture into a stirrer for stirring;

and step five, gradually adding the second part of water in the stirring process in the step four, and fully and uniformly stirring to obtain the repair material.

5. The construction process for repairing the pipeline by spraying the repairing material on the pipeline as claimed in any one of claims 1 to 3 is characterized by comprising the following specific steps:

firstly, determining a leakage or corrosion part of an underground pipeline according to the site topographic conditions and the surrounding environment of the pipeline, detecting along the pipe diameter direction, and determining a pipe section for spraying;

secondly, performing precipitation desilting, cleaning and pipe wall pretreatment on a pipe section to be sprayed;

thirdly, preparing a repairing material;

fourthly, spraying the prepared repairing material on the inner wall of the drainage pipeline through a centrifugal spraying machine;

fifthly, after 24 hours, carrying out flaw detection by using detection equipment, rechecking the thickness, surface roughness, surface flatness and crack condition of the spraying layer on the inner wall of the repaired pipeline, and carrying out evaluation and analysis;

and sixthly, repeating the fourth step if the inner wall of the repaired pipeline does not reach the standard.