的制管方法主要有哪几种？ What are the main methods of making cement pipes ?
Cement pipes are also called cement pressure pipes and reinforced concrete pipes in our construction process. It is often used as the construction of sewage pipes in urban construction foundations. It has the effect of draining sewage or flood drainage, and some Water supply pipes and farm machinery well pipes used in special factories and mines. The effects of cement pipes are becoming more and more important, and they are also widely used. How does this kind of cement pipes come out of output? There are four main pipe making technologies, including centrifugal pipe making skills, suspension roll pipe making skills, vertical kneading method, and core mold oscillation skills. The following is a detailed description of various pipe making methods and Method of operation.
1. Core mold sensation tube making skills
The core mold sensation pipe-making device is composed of a removable steel outer mold and a steel inner mold attached with a stirrer. The outer mold is made of two steel plate semi-circular tubes (three pieces at 20m diameter) with a thickness of about 5mm. The semi-cylinder is connected by a pin with a wedge. The inner mold is a whole cylinder. The lower diameter is higher than the upper diameter. Slightly smaller to remove the inner mold.
The pipe can be made with a dynamic pipe-making device, which can be used for construction on the floor where cement paper bags are laid. The surface where the formwork is in contact with the concrete should be coated with a lubricant (such as waste engine oil, etc.). After the steel cage is fixed between the inner and outer molds, first stir about 10s to make the model close to the floor to prevent slurry leakage.
Each section of the culvert is perfused in 5 layers. After each layer is leveled, the stirrer is activated, and the concrete slurry is stopped. Then, one layer is filled. After the subsequent layer is stirred and grouted, the top surface is smoothed. The slurry is poured for 2 to 3 minutes That is a closed bomber. The fixed pin is gradually withdrawn during the perfusion, with the lower side first and the upper side later. After smoothing out the shock, lift the inner mold with a chain block. When lifting, it should be straight, and when it is just lifted, it should be supplemented with a sensation (2 to 3 times, about 1s each time) to separate the inner mold from the concrete. When the inner mold is lifted 20cm, it must not be sensational. In order to move to another pipe-making orientation after lifting the inner mold, it should be lifted by a gantry crane. The outer mold is disassembled after pouring for 5-10 minutes. If it is not dismantled in time, it must be dismantled after the initial setting. The concrete surface defects should be repaired in time after disassembly.
The concrete made by the pipe-making device is easy to work with, and the slump is small, usually 1cm. Workability is 20 ～ 20s, sand content is 45% ～ 48%, large particle size above 5mm should be reduced as much as possible, uniform particle size 0.37 ～ 0.4mm, 150 ~ 160kg per square concrete water, cement using Portland cement or general cement as Well, water mountain ash cement is next.
The core mold sensation pipe making device is suitable for making reinforced concrete pipe sections with a diameter of 200 cm and a tube length of 100 cm or less. This method of pipe production requires layered perfusion, many sensations, laborious operations, and long pipe production time. However, due to the simple equipment and the rapid establishment of the plant, it is suitable for use in prefabricated plants with small batch consumption.