who can provide a model of service quality assurance measures, etc

The quality assurance measures are as follows:

The main tasks of quality control before the start of construction are: the qualification of the construction team, including the subcontractors, is reviewed. If the construction unit does not match the situation reviewed at the time of bidding, it will cause serious problems and should take effective measures to correct them.

Lu Jiandan conducts a detailed review of contract documents or technical documents and reports. For example, whether the drawings are complete, whether there are any missing items, whether there are contradictions between the documents, whether the technical standards are complete, and the details of the contract conditions.

Set up quality control points, set up the focus of technology and supervision for a certain process or link with high technical requirements and difficult construction, and focus on controlling operators, materials, equipment, construction process parameters and methods. For the process of common quality problems or unstable quality, which is prone to non-conforming products, control measures are proposed in advance. For new materials, new technologies, new process disturbances, and special structures, we will give key technical support and control.

The role of quality assurance measures

Quality assurance is an important part of project quality management, which coordinates with quality control work to jointly complete the tracking and control of project quality; Provide the basis and method for the continuous improvement and perfection of project quality. Quality assurance activities run through the entire life cycle of the project, and the quality control results are audited, analyzed and evaluated in stages, so that problems and deficiencies in the project implementation process can be found and corrected in a timely manner.

Through quality assurance activities, the quality status of the project can be fed back to the project personnel in a timely manner, so that the quality status of the project can be visible to all project personnel.

1) Drilling should be carried out in strict accordance with the design parameters. If the on-site drilling hole position can not meet the design requirements due to objective conditions, it should be displaced, calculated, and the parameters should be determined, and the hole should be filled if necessary.

2) The grouting material should meet the design requirements, and it is strictly forbidden to use expired agglomerated cement, and inspection should be carried out if necessary.

3) In the grouting process, it is necessary to choose the appropriate grout and grout ratio according to different situations.

4) The slurry ratio should meet the design requirements, and the maximum error in the slurry mixing is: 5% for cement, water glass and water, and 1% for admixture.

5) The mixing time of the slurry should be uniform, and the mixing time of general cement slurry and ultra-fine cement slurry should be 3 5min, but not more than 30min. It is strictly forbidden to use slurry that has not been stirred evenly or precipitated.

6) When grouting occurs during the grouting process, two holes can be grouting at the same time. If there is a drainage hole around the tunnel, the drainage hole should be buried to limit or block, and the drainage pipe and the drainage hole should be observed.

7) In the process of grouting process, always pay attention to the changes in pump pressure and flow, if the amount of grouting is large or the pressure drops suddenly, and the grouting pressure does not rise for a long time, the cause should be identified, such as the slurry leakage of the working face, plugging measures can be taken. For example, the slurry can be shortened by changing the slurry and adjusting the slurry ratio, and the slurry gel time can be shortened, and the large pump volume and low pressure grouting can be carried out, and intermittent grouting can be used if necessary, so as to achieve the purpose of controlled grouting in the area.

8) The pressure rises suddenly during the grouting process, the cause should be found in time and treated, because the slurry gel time is too short, the water glass pump should be stopped, only the cement slurry should be injected, and the double-liquid grouting should be carried out after the pump pressure returns to normal.

9) When a pump fails, it should be replaced with a standby pump immediately to continue grouting

10) When double-liquid grouting, a slurry mixer with a one-way valve must be used, and it is strictly forbidden to replace it with other things, so as not to cause blockage of the pipeline and grouting pump.

11) During the grouting process, the grouting pipeline should be kept unobstructed to prevent the judgment of the grouting end standard from being affected due to pipeline blockage.

12) When injecting double-liquid slurry, it is necessary to always pay attention to the inhalation ratio of the slurry, test the slurry gel time, and ensure the strength of the slurry and the water plugging effect of grouting and grouting .

13) After the double-liquid slurry grouting is finished or the grouting really needs to stop for a long time, stop the water glass pump first, then stop the cement slurry pump, and clean the pipeline with clean water to prevent the pipe from being blocked.

14) Segmented grouting shall be carried out in strict accordance with the section length of the forward (backward) grouting design, and the segmented length shall not be arbitrarily extended, and repeated grouting can be carried out if necessary to ensure the quality of grouting .

15) In the process of grouting process, the grouting record should be made, and the drilling situation, grouting pressure, grout flow, grouting amount, and accidents in the grouting process should be recorded to provide data for effect analysis.

16) Strictly inspect and evaluate the grouting effect, and the grouting operation can only be completed when the requirements are met. When the end of grouting standard is not reached, hole filling grouting should be carried out.