Rapid construction method of elastic polyurethane

Abstract

The invention relates to the technical field of prestressed concrete cylinder pipes, in particular to an elastic polyurethane rapid construction method. The method comprises the following steps that firstly, when mortar outer layer corrosion prevention is carried out, two spray guns which are staggered up and down are arranged on a lifting rack; secondly, the pipe is placed on a rotary large disc, and the angular speed of the rotary large disc is set; due to the implementation of the technical scheme, the characteristics of the elastic polyurethane are utilized, the rotation angular speed and the lifting speed are adjusted, and the construction method that the upper spray gun and the lower spray gun which are staggered are adopted for spraying in a staggered mode is adopted, so that the anti-corrosion efficiency can be improved, the anti-corrosion quality can be guaranteed, and about half of anti-corrosion time can be saved.

Description

Technical Field

[0001] The present application relates to the technical field of prestressed steel cylinder concrete pipes, and in particular to a rapid construction method of elastic polyurethane. Background Art

[0002] Prestressed concrete cylinder pipe (PCCP) is a new type of pipeline material introduced and developed in China in the 1990s. It is a water pipe made by winding annular prestressed steel wire on a high-strength concrete pipe core with a steel cylinder and then spraying a dense cement mortar protective layer on it.

[0003] The use of elastic polyurethane for corrosion protection of the outer mortar protective layer of water pipes is a new technology in this field, which is particularly suitable for medium and strong corrosion sections. Elastic polyurethane has certain wear resistance, impact resistance, strong adhesion, impermeability, high tensile strength, good low-temperature bending, and anti-aging properties.

[0004] The existing anti-corrosion spraying process has low construction efficiency and it is difficult to reach the designed thickness in one coat. Even if the designed thickness is reached, quality problems such as sagging and pinholes may occur. Summary of the invention

[0005] The purpose of this application is to propose a rapid construction method of elastic polyurethane to solve the above problems.

[0006] The present application is implemented as follows: a method for rapid construction of elastic polyurethane, which includes the following steps: a first step, when performing mortar outer layer anti-corrosion, two spray guns that are staggered up and down are set on the lifting frame; a second step, the pipe is placed on a rotating plate, and the angular velocity of the rotating plate is set; a third step, the lifting speed of the lifting frame is set, and the upper spray gun is turned on to spray the pipe from bottom to top; a fourth step, when the lower spray gun is raised to the initial spraying position of the upper spray gun, the lower spray gun is turned on for simultaneous spraying; a fifth step, when the upper spray gun sprays to the top of the pipe, the upper spray gun is closed; when the lower spray gun is raised to the top of the pipe, the lower spray gun is closed to complete the overall spraying of the pipe.

[0007] Furthermore, the lifting speed, the rotation speed and the upper and lower spacing of the two spray guns are adjusted according to the difference between the spraying thickness and the designed thickness; the time interval between the upper and lower spray guns spraying the same position of the pipe is not less than 10 seconds.

[0008] Due to the implementation of the above technical scheme, this application utilizes the characteristics of elastic polyurethane, adjusts the rotation angular velocity and the lifting speed, and adopts a construction method of staggered spraying with two spray guns staggered up and down, which can greatly improve the anti-corrosion efficiency, ensure the anti-corrosion quality, and save about half of the anti-corrosion time. DETAILED DESCRIPTION

[0009] The present application is not limited by the following embodiments, and the specific implementation method can be determined according to the technical solution of the present application and actual conditions.

[0010] Embodiment, a kind of elastic polyurethane rapid construction method comprises the following steps: The first step is to set two spray guns staggered up and down on the lifting frame when performing mortar outer layer anti-corrosion; The second step is to place the pipe on the rotating plate and set the angular velocity of the rotating plate; The third step is to set the lifting speed of the lifting frame and open the spray gun above to spray the pipe from bottom to top; Step 4: When the lower spray gun is raised to the initial spraying position of the upper spray gun, the lower spray gun is turned on for simultaneous spraying; The fifth step is to close the upper spray gun when it sprays to the top of the pipe; close the lower spray gun when it rises to the top of the pipe to complete the entire spraying of the pipe.

[0011] According to the characteristic of elastic polyurethane that it dries in 10 seconds, the present application changes the traditional spraying into staggered spraying with two spray guns that are staggered up and down. At the same time, the angular velocity of the turntable and the lifting speed of the spray gun are adjusted so that the interval between the elastic polyurethane sprayed by the upper spray gun and the elastic polyurethane sprayed by the lower spray gun at the same position of the pipe is more than 10 seconds, forming a one-time operation, two sprayings, and two-layer coverage. The second spraying is carried out within 10 seconds, and the construction efficiency is increased by about 1 times, meeting the requirements of mass production.

[0012] In addition, the double spray guns can be adjusted to multiple spray guns with upper and lower intervals according to the thickness requirements.

[0013] According to the difference between the spraying thickness and the designed thickness, adjust the lifting speed, rotation speed and the upper and lower distance between the two spray guns; the time interval between the upper and lower spray guns spraying at the same position of the pipe shall not be less than 10 seconds.

[0014] Taking DN2400 pipes as an example, the daily output can be increased from 30 sections / day to more than 55 sections / day, which can increase the output value by about 180,000 yuan / day.

[0015] Combined with the effectiveness and practicality of this method, it has been applied in the anti-corrosion construction of pipes in major domestic water conservancy projects with good results. At the same time, this method is suitable for the anti-corrosion of pipes of multiple specifications.

[0016] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0017] The above technical features constitute the best implementation example of the present application, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A rapid construction method of elastic polyurethane, characterized in that: The following steps are involved: The first step is to set two spray guns staggered up and down on the lifting frame when performing mortar outer layer anti-corrosion; The second step is to place the pipe on the rotating plate and set the angular velocity of the rotating plate; The third step is to set the lifting speed of the lifting frame and open the spray gun above to spray the pipe from bottom to top; Step 4: When the lower spray gun is raised to the initial spraying position of the upper spray gun, the lower spray gun is turned on for simultaneous spraying; The fifth step is to close the upper spray gun when it sprays to the top of the pipe; close the lower spray gun when it rises to the top of the pipe to complete the entire spraying of the pipe.

2. A rapid construction method of elastic polyurethane according to claim 1, characterized in that: According to the difference between the spraying thickness and the designed thickness, adjust the lifting speed, rotation speed and the upper and lower distance between the two spray guns; the time interval between the upper and lower spray guns spraying at the same position of the pipe shall not be less than 10 seconds.