Method and manufacturing system for preparing adaptive steel-fiber-reinforced precast concrete members

A method for preparing adaptive steel-fiber-reinforced precast concrete members, comprising the following steps:

• S1:
• performing a microscopic numerical simulation of the members, to obtain a distribution diagram of stresses of the member under load, obtaining a distribution of direction and number of the steel fibers at each part of the member based on the distribution diagram of stresses, thereby constructing a model of the distribution of direction and number of the steel fibers;
• S2:
• calculating the mixing ratio of a material based on the model of the distribution of direction and number of steel fibers obtained in step S1 and preparing a pre-mixed mortar mixture based on the mixing ratio;
• adjusting the workability of the pre-mixed mortar mixture to meet the requirements for 3D printing and weighing the steel fibers according to the mixing ratio for subsequent use;
• S3:
• planning the printing path for pre-3D printing of the member, obtaining the printing path, comprehensively analyzing the printing path and the model of the distribution of direction and number of the steel fibers obtained by step S1, to obtain information of direction and number of the steel fibers at each part of the printing path;
• S4:
• sending information of direction and number of the steel fibers at each part of the printing path obtained by step S3 to a locator;
• controlling the distribution of direction and number of the steel fibers at each part of the printing path in real-time by using the locator when a manufacturing system for 3D printing is performing 3D printing;
• step S4 further comprises the following steps:
• S41:
• obtaining a current position by using the locator and sending the number of steel fibers to be added and the amount of pre-mixed mortar to be added at the current position to a discharging control mechanism of the manufacturing system, conveying the steel fibers to be added and the pre-mixed mortar to be added to a mixing mechanism of the manufacturing system by using the discharging control mechanism and mixing the steel fibers and the mortar by using the mixing mechanism to prepare the pre-mixed mortar mixture, and conveying the mixture to a direction adjustment mechanism for steel fibers after mixing is completed;
• S42:
• controlling the direction adjustment mechanism by using the locator to adjust the direction of the steel fibers, so that the direction of the steel fibers in the mixture matches the direction of stress at the current position, then conveying the mixture to a 3D printing mechanism of the manufacturing system and performing 3D printing to form the member;
• step S42 further comprises the following steps:
• S421:
• transferring the mixture which has been mixed by step S42 to a pre-orienting unit located at the top of the direction adjustment mechanism, so that the direction of the steel fibers is parallel to the direction in which the mixture is conveyed;
• S422:
• adjusting the direction of the steel fibers again so that the direction of the steel fibers is parallel to the direction of stress at the current position when the mixture falls into a direction adjustment unit which is located at the bottom of the direction adjustment mechanism;
• and, each of the second to fourth solenoid groups is a solenoid pair, comprising two solenoids respectively on two sides which are symmetric about the extrusion direction and are around the extrusion passage;
• when two solenoids respectively on two sides symmetric about the extrusion direction are energized, a magnetic field with a direction parallel to the extrusion direction is formed in the extrusion passage, and when passing through the extrusion passage, the steel fibers in the mixture are magnetically rotated to a direction parallel to the extrusion direction;
• and when two solenoids respectively on two sides not symmetric about the extrusion direction are energized, a magnetic field with a direction at an angle to the extrusion direction is formed in the extrusion passage, and the steel fibers are driven to rotate to a direction parallel to the direction of the magnetic field.