CN-121611475-B - Intelligent injection path planning method for injecting UHPC reinforced tunnel

CN121611475BCN 121611475 BCN121611475 BCN 121611475BCN-121611475-B

Abstract

The application relates to an intelligent injection path planning method for injecting a UHPC reinforced tunnel, which comprises the steps of calculating the single maximum injection thickness of each construction reinforced section based on the included angle between a nozzle and each construction reinforced section, determining the injection times of the corresponding construction reinforced section based on the single maximum injection thickness of each construction reinforced section and the to-be-injected thickness of UHPC material, carrying out a single-point deposition injection test of a side wall UHPC, obtaining deposition coefficients and deposition rates of different construction reinforced sections, constructing an injection parameter equation according to the deposition coefficients and the injection times and the deposition rates of different construction reinforced sections, designing an injection path under the longitudinal length of the planned path of each construction reinforced section, determining the optimal combination of the UHPC injection path distance and the uniform velocity of the nozzle in each injection path based on the injection parameter equation, and realizing three targets of controllable quality, improved efficiency and automatic adjustment.

Inventors

WU HUAINA
WEN JIA
CHEN RENPENG
CHEN TAO
YANG XINXIN
LI YU
CHENG HONGZHAN
MENG FANYAN

Assignees

湖南大学

Dates

Publication Date: 20260512
Application Date: 20260128

Claims (8)

1. An intelligent injection path planning method for injecting a UHPC reinforced tunnel is characterized by comprising the following steps: s1, acquiring design information, wherein the design information comprises tunnel design information and material design parameters; S2, determining the UHPC material to-be-sprayed thickness of different construction reinforcing sections of the tunnel according to the tunnel lining information and the position information of the construction reinforcing sections in the tunnel design information; S3, calculating the single maximum spraying thickness of each construction reinforcing section based on the included angle between the spray nozzle and each construction reinforcing section, and determining the spraying times of the corresponding construction reinforcing section based on the single maximum spraying thickness of each construction reinforcing section and the UHPC material to-be-sprayed thickness; S4, performing a single-point deposition spray test of the side wall UHPC to obtain deposition coefficients and deposition rates of different construction reinforcing sections; S5, constructing an injection parameter equation according to the deposition coefficient, the injection times and the deposition rate of different construction reinforcing sections, designing an injection path under the longitudinal length of a planned path of each construction reinforcing section, and determining the optimal combination of UHPC injection path spacing and nozzle uniform velocity in each injection path based on the injection parameter equation, wherein the method comprises the following steps: step 1, designing the jet path of each construction reinforcing section under the longitudinal length of the planned path as an arch-shaped path; Step 2, for any one of the injection paths, the method comprises A value of UHPC injection path spacing is randomly selected in the interval, And expressing the concrete diffusion radius of the sprayed surface, substituting the value into the spraying parameter equation to solve the corresponding uniform speed of the spray nozzle, wherein the spraying parameter equation has the expression: ; Wherein, the Represent the first The UHPC material of each construction reinforcing section is intended to be sprayed to thickness, Represent the first The single maximum jet thickness of each construction reinforcing section, Represent the first The nozzles in the single injection of the construction reinforcing section are moved at a constant speed, Representing the deposition coefficient of the wafer, Represent the first The deposition rate of the individual construction reinforcement sections, Indicating the UHPC injection path spacing, Representation of Middle (f) The nozzle moves at a constant speed during the secondary injection, Represent the first The number of injections of each construction reinforcing section, Represent the first The nozzle moves at a constant speed during secondary injection; Step3, adopting the UHPC spray path spacing selected randomly and the corresponding nozzle to perform trial spraying at a constant speed; Step 4, when the deposition superposition profile of the UHPC material after trial spraying does not meet the design requirement, the method comprises the following steps of And resampling a value of the UHPC injection path distance in the interval, and executing the steps 2-4 based on the resampled value until the deposition superposition profile of the UHPC material after pilot injection meets the design requirement, and outputting the optimal combination of the UHPC injection path distance in the corresponding injection path and the uniform speed of the nozzle.
2. The intelligent spray path planning method of claim 1, wherein the material design parameters include slump, compressive strength, flexural strength, modulus of elasticity, level of resistance to permeation.
3. The intelligent jet path planning method according to claim 1, wherein the tunnel lining information comprises an inner diameter, an outer diameter, a thickness and a ring width of the tunnel lining, the length information of the construction reinforcing section comprises a total longitudinal length of the tunnel reinforcing section, and the position information of the construction reinforcing section comprises distribution positions of the tunnel reinforcing section.
4. The intelligent injection path planning method according to claim 3, wherein S2 includes: Determining reinforcement positions according to the position information of the construction reinforcement sections, and taking the thicknesses of lining of different construction reinforcement sections in the tunnel as the UHPC material to-be-sprayed thickness of the corresponding construction reinforcement sections; and taking the length information of the different construction reinforcing sections as the longitudinal length of the planning path of the corresponding construction reinforcing section.
5. The intelligent spray path planning method of claim 1, wherein the single maximum spray thickness of the construction reinforcement section is calculated as: ; Wherein, the Represent the first The single maximum jet thickness of each construction reinforcing section, Representation of the first pair The included angle between the central axis of the nozzle and the horizontal plane of the tunnel when UHPC material is sprayed on each construction reinforcing section, 、、 The first constant, the second constant and the third constant are respectively.
6. The intelligent injection path planning method according to claim 1, wherein the number of injections of the construction reinforcing section is calculated as: ; Wherein, the Represent the first The number of injections of each construction reinforcing section, Represent the first The UHPC material of each construction reinforcing section is intended to be sprayed to thickness, Represent the first The single maximum jet thickness of each construction reinforcing section, Represents a positive integer number of the cells, Representing a rounding down.
7. The intelligent injection path planning method according to claim 1, wherein S4 includes: Under the spraying condition that the spraying wind pressure is 0.6MPa and the spraying surface is vertical, respectively placing the nozzles of the spray gun at the spraying distances of 0.3m, 0.4m and 0.5m from the spraying surface of the side wall, respectively continuously spraying UHPC materials for 10s at each position, always keeping the central axis of the nozzles on the spray gun vertical to the spraying surface of the side wall in the spraying process, and measuring the thickness of the corresponding deposition center point, the concrete diffusion radius of the spraying surface and the deposition volume of the spraying surface at different positions after the spraying at each position is finished; And calculating the deposition coefficient and the deposition rate of different construction reinforcing sections based on the thickness of the deposition center point corresponding to the spraying at different positions, the concrete diffusion radius of the sprayed surface and the deposition volume.
8. The intelligent spray path planning method according to claim 7, wherein calculating the deposition rate of the deposition coefficient and the different construction reinforcement segments based on the thickness of the deposition center point, the concrete diffusion radius of the sprayed surface, and the deposition volume corresponding to the spray at the different positions, comprises: Constructing a UHPC single-point injection Gaussian deposition rate equation, wherein the expression is as follows: ; Wherein, the Representing a deposition center Is defined by the thickness of the substrate, Representing the deposition coefficient of the wafer, Represent the first The deposition rate of the individual construction reinforcement sections, The concrete diffusion radius of the sprayed surface is shown, Representing nozzle coordinates on the spray gun; Dividing the corresponding deposition volume sprayed at different positions by the concrete diffusion radius of the sprayed surface and the deposition volume to obtain the deposition rate of the side wall; Respectively substituting the thickness of the deposition center point corresponding to each position, the concrete diffusion radius of the sprayed surface, the deposition center point coordinates, the nozzle coordinates and the deposition rate of the side wall into the UHPC single-point spraying Gaussian deposition rate equation to solve the deposition coefficient corresponding to each position; Based on the numerical relation between the deposition rate of the side wall and the corresponding included angle, a deposition rate-angle fitting equation is constructed, and the expression is: ; Wherein, the 、 Respectively a fourth constant and a fifth constant, Representation of the first pair The included angle between the central axis of the nozzle and the horizontal plane of the tunnel when UHPC material is sprayed on each construction reinforcing section; Substituting the included angle between the nozzle and each construction reinforcing section into the deposition rate-angle fitting equation to obtain the deposition rate of each construction reinforcing section.

Description

Intelligent injection path planning method for injecting UHPC reinforced tunnel Technical Field The application relates to the technical field of tunnel reinforcement UHPC injection path planning, in particular to an intelligent injection path planning method for injecting UHPC reinforced tunnels. Background Ultra-high performance concrete (UHPC for short, also called active powder concrete) has been increasingly used in the field of building reinforcement with its excellent mechanical properties and durability. The existing mechanical spraying technology still has two major problems, namely, the assumption of uniform spraying thickness and neglect of the distribution characteristic of sprayed material clusters, so that the tunnel is easy to suffer from defects such as limit invasion, lining falling and cracking in the using stage. Therefore, the intelligent spraying technology needs to reasonably set and select spraying parameters and plan spraying paths according to construction materials. The invention patent with the publication number of CN120401804A discloses a concrete spray forming method and a system for a special-shaped curved floor support plate, the invention adopts a mode of combining a space coordinate point set with spray path simulation aiming at the special-shaped curved floor support plate spray, however, only the slump index of common concrete on the material layer is considered, the influence of the superimposed contour shape of sprayed concrete on the forming quality of the curved floor carrier plate is not considered, and the thickness and quality of spray forming are difficult to ensure by using a single space coordinate threshold value as a path planning of a spray qualification judgment standard. The invention patent application with publication number of CN120592649A discloses an automatic spraying method for tunnel and roadway concrete support, which divides spraying areas into two groups alternately in a mode of arch foot first and arch waist second to realize uninterrupted spraying, but does not consider the influence of superposition contours generated by the flowability of sprayed material mass on the forming quality, and the experience of a spraying path selection project is larger. Disclosure of Invention Aiming at the technical problems of poor uniformity, insufficient compactness and the like in the existing fully-mechanized automatic injection operation of a complex tunnel, it is necessary to provide an intelligent injection path planning method suitable for mechanical wet-injection UHPC construction in the field of tunnels so as to push the tunnel construction to advance towards the intelligent, high-efficiency, low-cost and high-quality directions, in particular to an intelligent injection path planning method for injecting UHPC reinforced tunnels, which comprises the following steps: s1, acquiring design information, wherein the design information comprises tunnel design information and material design parameters; S2, determining the UHPC material to-be-sprayed thickness of different construction reinforcing sections of the tunnel according to the tunnel lining information and the position information of the construction reinforcing sections in the tunnel design information; S3, calculating the single maximum spraying thickness of each construction reinforcing section based on the included angle between the spray nozzle and each construction reinforcing section, and determining the spraying times of the corresponding construction reinforcing section based on the single maximum spraying thickness of each construction reinforcing section and the UHPC material to-be-sprayed thickness; S4, performing a single-point deposition spray test of the side wall UHPC to obtain deposition coefficients and deposition rates of different construction reinforcing sections; and S5, constructing an injection parameter equation according to the deposition coefficient, the injection times and the deposition rate of different construction reinforcing sections, designing an injection path under the longitudinal length of a planned path of each construction reinforcing section, and determining the optimal combination of UHPC injection path spacing and nozzle uniform velocity in each injection path based on the injection parameter equation. Preferably, the material design parameters include slump, compressive strength, flexural strength, modulus of elasticity, barrier grade. Preferably, the tunnel lining information comprises the inner diameter, the outer diameter, the thickness and the annular width of the tunnel lining, the length information of the construction reinforcing section comprises the total longitudinal length of the tunnel reinforcing section, and the position information of the construction reinforcing section comprises the distribution positions of the tunnel reinforcing section. Preferably, S2 comprises: Determining reinforcement positions according to the position information