Analysis on the construction technology of high-st

2022-07-22
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As a construction personnel, whether you are a technician of a building materials company or a construction personnel of a construction company, I believe everyone knows that high-strength pipeline grouting material has the excellent performance of micro expansion, non shrinkage, large flow, self compacting, extremely low bleeding rate, high filling degree, thin air bag foam layer, small diameter, high strength, rust prevention, low alkali and chlorine free, high adhesion, and green environmental protection. It does not contain oxides, chlorides, sulfites, nitrites and other harmful components to reinforcement. It is a grouting agent refined from high-performance plasticizer, surfactant, calcium silicate micro expansion agent, hydration heat inhibitor, migration rust inhibitor, nano mineral silicon aluminum calcium iron powder, stabilizer or a high-strength pipeline grouting material refined and compounded with low alkali and low heat Portland cement. So how can such high-pressure slurry be correctly constructed to make its performance more powerful? Today, the grouting material manufacturer will share with you

the construction process of high-strength pipeline grouting material is as follows:

1. Before grouting, remove sundries and ponding in the beam duct. During grouting, the slurry temperature should be between 5 ℃ -30 ℃. Within 3 days after grouting and grouting, the beam body and ambient temperature should be greater than 5 ℃, otherwise maintenance measures should be taken. When the temperature is higher than 35 ℃, it should be constructed at night or in the morning and evening. When the temperature is lower than 5 ℃, it should be treated according to the technical requirements of winter construction, and the air content index should be increased appropriately

2. Before grouting, start the grouting pump to discharge a little slurry from the grouting nozzle to remove the air, water and slurry in the grouting pipeline. When the fluidity of the discharged slurry is consistent with that in the mixing tank, start to press into the beam duct

3. The maximum pressure of grouting should not exceed 0.6MPa, and the grouting filling degree should reach that the other end of the duct is full and the slurry with the same fluidity as the specified is discharged at the exhaust hole. After closing the slurry outlet, the pressure stabilization period of not less than 0.5MPa and not less than 3min shall be maintained

4. For continuous beams or pressure grouting, let the water slurry suspension in the pipeline flow freely from the outlet end; Pump the slurry again until there is homogeneous slurry flowing out at the outlet, and keep it for 5min under the pressure of 0.5MPa. This process should be repeated 1-2 times. After grouting, the compaction of grouting shall be checked from the grouting hole of anchor base plate. If it is not dense, it shall be refilled in time to ensure that the hole is completely dense

5. If vacuum assisted grouting process is used, vacuum pumping should be carried out first before grouting to stabilize the vacuum degree in the duct between -0.06mpa--0.08mpa. After the vacuum degree is stable, immediately open the valve at the grouting end of the pipeline and open the grouting pump for continuous grouting

6. Grouting sequence: first down and then up. Grouting of the same pipe should be carried out continuously and completed at one time. The time from slurry mixing to pressing into the beam should be less than 40min

7. Grouting sampling: during grouting, three groups of standard curing specimens (40mm) shall be made for each hole beam × 40mm × 160mm), conduct compressive strength and flexural strength tests, and record the grouting

Qicheng road and Bridge grouting material manufacturer hotline: 0318-5212333 15350835289

website: http://www.hebeiqicheng.com

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