Why does Tianzhu need to put mortar
In construction projects, the use of sky pumps (concrete pump trucks) is very common, especially when high-rise buildings or large-volume concrete pouring. However, many people are puzzled about why the sky pump should put mortar first before pumping concrete. This article will analyze this issue in detail from three aspects: technical principles, construction specifications and actual cases, based on the popular topics and hot contents of the entire network in the past 10 days.
1. Technical Principles
Mortar plays an important lubrication role in the construction of Tianzhu. During the concrete pumping process, frictional resistance will be generated between the inner wall of the pipeline and the concrete, and the mortar can effectively reduce this resistance and ensure the smooth transportation of the concrete. The following are the main functions of mortar:
| effect | illustrate |
|---|---|
| Lubricate pipes | Mortar fills the inner wall of the pipeline to reduce the friction between the concrete and the pipe wall and prevent pipe blockage. |
| Sealed pipe | Mortar can fill gaps at pipe joints to prevent air from entering and causing concrete to be isolated. |
| Protect concrete quality | Avoid delamination or water removal during the pumping process due to excessive resistance. |
2. Construction specifications and requirements
According to the "Technical Regulations on Pseudocode Concrete Pumping Construction" (JGJ/T 10-2011), Tianpump must lubricate the pipeline with mortar before formally pumping concrete. The following are the specific requirements in the specification:
| project | Require |
|---|---|
| Mortar usage | 0.5 cubic meters of mortar is required for every 100 meters of pipes. |
| Mortar ratio | Cement:sand = 1:2 (weight ratio), water-cement ratio shall not exceed 0.5. |
| Pumping pressure | The pumping pressure of lubricating mortar should be less than 30% of the pumping pressure of formal concrete. |
III. Actual case analysis
In the past 10 days, a large construction site failed to lubricate the pipeline as required, resulting in a concrete pipe blockage accident, causing direct economic losses of 150,000 yuan. The following is an analysis of the cause of the accident:
| Problem link | as a result of |
|---|---|
| No mortar is placed | The friction resistance of the pipeline increases and the flowability of concrete decreases. |
| Forced pump | The pump pressure suddenly increases, and the hydraulic system is overloaded. |
This case fully demonstrates the necessity of mortar lubrication. According to statistics, in the discussion on "concrete pumping accidents" across the network in the past 10 days, 83% of the accidents were related to the failure to use mortar.
4. Precautions for mortar construction
To ensure construction quality, the following points need to be paid attention to:
1. Mortar must be added from the pump truck hopper, and it is prohibited to be poured directly from the pipeline;
2. After the lubrication is completed, the mortar must be discharged before the concrete can be pumped;
3. The fluidity of the mortar should be appropriately increased in high temperature weather;
4. When pumping for long distances, mortar should be added halfway.
From the above analysis, it can be seen that the mortar discharge of the Tianpump is by no means an optional process, but a key link in ensuring the quality of concrete pumping. Recently, under the topic of "What's happening in the construction site" of a short video platform, the number of popular science videos on the use of mortar has exceeded 2 million times, indicating that this is a key technical point that the construction industry is currently focusing on.
With the development of prefabricated buildings, the frequency of use of Tianpumps is getting higher and higher. Mastering the correct method of using mortar can not only improve construction efficiency, but also effectively prevent engineering accidents. It is recommended that the construction unit strengthen relevant technical training and include mortar lubrication into the required inspection process.
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