The post-maintenance of the mandrel vibration tube making machine is also very important, especially the early maintenance after the tube is formed. Hard dry concrete has low water content and low flow rate.

　　Due to poor dynamic performance and poor control, it is easy to cause dehydration and dryness, and the density is poor. The concrete is prone to honeycomb, holes, ring cracks, etc., which seriously affects the overall strength of the concrete.

　　The post-maintenance of the core vibration pipe manufacturing process is also very important, especially the early maintenance after the pipe is formed. Dry hard concrete has low water content, poor fluidity, and poor control, which can easily cause water loss, dryness, compaction, honeycomb, holes, and cracks, which seriously affect the overall strength of concrete.

　　Compared with the centrifugal method and the suspension roller method, the mandrel vibration pipe making machine is a new type of mechanical processing technology with high mechanical vibration and automation. Although it started late, due to its advantages, it is increasingly valued and favored by the control industry.

　　(1) Underground closed vertical forming and ground control have changed various unfavorable factors of centrifuge processing and horizontal production, greatly improved the production environment and working environment, and the labor intensity is low, which is conducive to safe and civilized production;

　　(2) No need for steam curing, it can be covered with plastic film, hydration heat, moisture, and heat preservation with cement, and can be hoisted to the open storage yard after 24 hours;

　　(3) Vibration frequency, amplitude and vibration force can be adjusted according to various specifications of pipelines;

　　(4) Since it is formed by vertical vibration, it can form a large pipe diameter. As long as the corresponding configuration, special-shaped pipe fittings are sufficient to meet the production of various specifications and models of inspection wells, box culverts, bases, anti-corrosion lining pipes, etc.

　　(5) Due to the vertical production, the concrete does not need to pass through the steel skeleton completely from the inside to the outside, such as the centrifugal process and the hanging roller method. Therefore, the concrete material is not affected by the pitch of the reinforcement. Therefore, to meet the relevant conditions, try to choose thin-diameter steel bars to reduce the crack width or delay cracks, so as to adapt to the production of small-pitch dense steel bars;

　　(6) Due to vertical production, the socket is located at the lower end, which is suitable for the production of sockets and enterprise mouth pipes, and changes the technological factors of low strength of horizontal production sockets;

　　(7) The dry hard concrete adopts the dry production process, the slump is zero, the water-cement ratio is small, and the high-frequency vibration improves the concrete strength;

　　(8) The inner core mold adopts high-frequency overall vibration to make the concrete mixture fully vibrate, uniform and dense, especially suitable for pipe jacking production;