CN-121972320-A - Self-adaptive injection ECC accelerator adding method and system

CN121972320ACN 121972320 ACN121972320 ACN 121972320ACN-121972320-A

Abstract

The invention discloses a self-adaptive method and a self-adaptive system for adding an ECC (error correction code) accelerator, and belongs to the technical field of ECC injection construction. The method comprises the steps of detecting a first flow signal of ECC slurry in real time, calculating a target accelerator flow in real time according to a preset mixing amount ratio and the first flow signal, driving a metering pump to convey the accelerator to a mixing part according to the target flow, and uniformly dispersing the accelerator into the slurry through a multi-point spraying/dispersing device arranged on the mixing part and then spraying at a high speed. Preferably, the method further comprises a temperature compensation step of dynamically correcting the doping ratio based on the temperature signal, and a closed loop feedback step of PID adjustment based on the actual accelerator flow. According to the invention, the dynamic synchronization of the flow of the accelerator and the slurry is realized through the flow feedforward control, the dispersion uniformity is ensured through an optimized mixing structure, the defects of the traditional technology such as mixing imbalance and uneven mixing are overcome, and the construction quality and the stability of the material performance of the jet ECC slurry are obviously improved.

Inventors

ZHENG CHAOBAO
ZHOU XINJI
LI ZHIQING
WEI XIAO
LI RONG
GONG ZIHAN
YAO LONG

Assignees

中铁西南科学研究院有限公司
中铁岩锋成都科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260402

Claims (10)

1. The self-adaptive injection ECC accelerator adding method is characterized by comprising the following steps of: s1, acquiring a first flow signal of ECC slurry flowing through an ECC slurry main channel in real time; S2, calculating the target accelerator flow in real time according to a preset basic target mixing ratio and the first flow signal, wherein the calculation formula is as follows: wherein For the flow rate of the target accelerator, As a result of the first flow signal, The mixing amount ratio is a preset basic target mixing amount ratio; s3, generating a control instruction according to the target accelerator flow and driving an accelerator metering pump to operate so as to convey the accelerator to the mixing part through an independent accelerator conveying channel; s4, uniformly introducing and dispersing the accelerator into the flowing ECC slurry through a multi-point spraying/dispersing device at the mixing part; s5, spraying the mixed materials to a sprayed surface at a high speed through a nozzle.
2. The adaptive spray ECC accelerator addition method according to claim 1, further comprising a temperature compensation step prior to the step S2, the temperature compensation step comprising: S1.1, acquiring temperature signals of environment or ECC slurry in real time; S1.2, dynamically correcting the preset basic target doping amount ratio according to the temperature signal and a preset temperature compensation model to obtain an actual target doping amount ratio subjected to temperature compensation, wherein the calculation formula is as follows: wherein Expressed as an actual target doping ratio, Represented as a preset temperature compensation model, Represented as a temperature signal.
3. The method for adding an adaptive ECC accelerator according to claim 2, wherein the temperature compensation model is a preset lookup table or polynomial function, and the lookup table contains compensation coefficients corresponding to different temperature intervals.
4. The adaptive injection ECC accelerator addition method according to claim 1, wherein the step S3 further includes a closed-loop feedback adjustment sub-step including: S3.1, acquiring an actual flow signal of the accelerator flowing through the accelerator conveying channel in real time; s3.2, calculating the deviation between the target accelerator flow and the actual flow signal; And S3.3, generating a correction signal through a PID control algorithm based on the deviation, and superposing the correction signal and the control instruction to adjust the output of the accelerator metering pump in a closed loop.
5. The method according to claim 1, wherein in the step S4, the multi-point spraying/diffusing device has a ring-shaped porous structure, and includes a plurality of through holes uniformly distributed circumferentially on the wall of the main channel of the ECC slurry, and the axes of the through holes are inclined to the slurry flow direction, so as to inject the accelerator in the form of a plurality of fine jets.
6. The method according to claim 1, wherein in the step S4, the multi-point spraying/diffusing device further comprises an atomizing nozzle for atomizing the accelerator into fine droplets and spraying the droplets into the ECC slurry channel, and the mixing section further comprises a cyclone mixing chamber, wherein a flow guiding rib is disposed inside the cyclone mixing chamber, and the flow guiding rib is used for generating cyclone for forcibly mixing the ECC slurry with the atomized accelerator.
7. An adaptive spray ECC accelerator addition system for implementing the adaptive spray ECC accelerator addition method according to any one of claims 1-6, comprising: A spray head structure, the spray head structure comprising: The ECC slurry main channel is used for conveying ECC slurry; the accelerator conveying channel is arranged independently of the ECC slurry main channel; a mixing section where the accelerator transport passage and the ECC slurry main passage meet; the multipoint spraying/diffusing device is arranged at the mixing part and is used for uniformly dispersing the accelerator into the ECC slurry; The ECC slurry flow sensing unit is used for monitoring the first flow signal in real time; An accelerator metering pump connected to the accelerator delivery channel; And the signal input end of the controller is connected with the ECC slurry flow sensing unit, and the signal output end of the controller is connected with the accelerator metering pump and is configured to execute the step S2 and the step S3.
8. The adaptive spray ECC accelerator addition system according to claim 7, further comprising a temperature sensing unit for acquiring the temperature signal, wherein the controller is further configured to perform a temperature compensation step.
9. The adaptive injection ECC accelerator addition system according to claim 7, further comprising an accelerator flow sensing unit for acquiring the actual flow signal, wherein the controller is further configured to perform a closed-loop feedback adjustment sub-step.
10. The adaptive spray ECC accelerator addition system according to claim 7, wherein the spray head structure further comprises a compressed air delivery channel, an outlet of the compressed air delivery channel is directed to an outlet area of the atomizing nozzle for providing auxiliary spray power, the compressed air delivery channel is communicated with the accelerator delivery channel for assisting atomization of the accelerator, the multi-point spray/diffusion device is of an annular porous structure and comprises a plurality of tiny through holes uniformly distributed on the wall of the ECC slurry main channel in the circumferential direction, the multi-point spray/diffusion device further comprises an atomizing nozzle, and the mixing part further comprises a rotational flow mixing cavity provided with flow guide ribs.

Description

Self-adaptive injection ECC accelerator adding method and system Technical Field The invention relates to the technical field of ECC (error correction code) injection construction, in particular to a self-adaptive injection ECC accelerator adding method and system. Background Engineering cement-based composite materials (ECC) are widely applied in the fields of structural repair, earthquake resistance reinforcement and the like due to high toughness, high crack resistance and excellent strain hardening characteristics. Jetting construction is a key technology for realizing quick application of ECC. However, unlike ordinary shotcrete, ECC slurries are high in viscosity, contain a large amount of fibers, and their mechanical properties are extremely sensitive to uniformity of components (especially fiber dispersion). During ECC injection, accelerator is synchronously added at the nozzle according to actual conditions. The prior art typically employs a simple "T" or Y-tube to "passively" introduce the accelerator into the ECC slurry prior to the nozzle. The method has the following major defects that firstly, the mixing is uneven, the physical property difference of the ECC slurry and the accelerator is huge, the passive mixing is extremely easy to generate an inclusion, the accelerator is unevenly distributed, partial areas are not coagulated or flash coagulated, the strain hardening performance of ECC is seriously deteriorated, secondly, the synchronism is poor, the pumping capacity (flow) of an ECC slurry pump is fluctuated in construction, the accelerator pump usually runs at a constant speed in an open loop manner, the proportion of the accelerator is disordered, the time is high, and the time is low, thirdly, the self-adaption is lacking, the reaction rate of the accelerator is extremely sensitive to the environmental temperature, the doping amount cannot be automatically adjusted according to the temperature change of winter construction and summer construction by the traditional method, the construction quality is extremely unstable, the accelerator pump is often not coagulated in winter, and the pipe is easy to block in summer. Disclosure of Invention Aiming at the defects in the prior art, the invention aims to provide a self-adaptive injection ECC accelerator adding method and system, which realize dynamic synchronization of accelerator and slurry flow through flow feedforward control, ensure dispersion uniformity through an optimized mixing structure, overcome the defects of mixing imbalance and uneven mixing in the traditional technology and obviously improve the construction quality and the stability of material performance of injection ECC. In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions: The embodiment of the application provides a self-adaptive injection ECC accelerator adding method, which comprises the following steps of S1, acquiring a first flow signal of ECC slurry flowing through an ECC slurry main channel in real time, S2, calculating a target accelerator flow in real time according to a preset basic target doping amount ratio and the first flow signal, wherein the calculation formula is as follows: wherein For the flow rate of the target accelerator,As a result of the first flow signal,The method comprises the steps of (1) setting a preset basic target mixing amount ratio, S3 generating a control instruction according to the target accelerator flow and driving an accelerator metering pump to operate so as to convey accelerator to a mixing part through an independent accelerator conveying channel, S4 uniformly introducing and dispersing the accelerator into flowing ECC slurry through a multi-point spraying/dispersing device at the mixing part, and S5 spraying the mixed material to a sprayed surface at a high speed through a nozzle. Further, the method further comprises a temperature compensation step before the step S2, wherein the temperature compensation step comprises the steps of S1.1, acquiring temperature signals of environment or ECC slurry in real time, S1.2, dynamically correcting the preset basic target doping amount ratio according to the temperature signals and a preset temperature compensation model to obtain a temperature compensated actual target doping amount ratio, wherein a calculation formula is as follows: wherein Expressed as an actual target doping ratio,Represented as a preset temperature compensation model,Represented as a temperature signal. Further, the temperature compensation model is a preset lookup table or polynomial function, and the lookup table comprises compensation coefficients corresponding to different temperature intervals. Further, the step S3 further comprises a closed-loop feedback adjustment sub-step, wherein the closed-loop feedback adjustment sub-step comprises the steps of S3.1, acquiring an actual flow signal of the accelerator flowing through the accelerator conveyi