Stepping type intelligent pipe drawing method and system for diaphragm wall side guide pipe
Through low-field NMR technology and power function fitting, the problem of inaccurate extraction time and height of concrete of anti-seepage wall was solved, and scientific and accurate extraction time and height determination were achieved, and construction quality and efficiency were improved.
Patent Information
- Application Number
- CN202510515406.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2025-07-29
AI Technical Summary
The determination of the time and height of concrete extraction of anti-seepage walls in the prior art lacks scientific accuracy, resulting in low construction quality and efficiency, and problems such as concrete collapse, fracture and difficulty in extraction.
Low-field NMR technology is used to monitor the hydration process of concrete, combine basic process parameters and power function fitting, and establish load curves and strength curves, and determine the optimal extraction time and height through intersection solutions to achieve step-by-step extraction.
It improves the quality and efficiency of anti-seepage wall construction, reduces construction risks and costs, and ensures the continuity and anti-seepage performance of concrete.
Smart Images
Figure CN120384548A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of hydraulic engineering construction, and more specifically, it relates to a method and system for step-by-step intelligent pipe extraction of side conduits of impervious walls. Background Art
[0002] In the construction of impervious walls for water conservancy and hydropower projects, the determination of the pipe extraction time is crucial for ensuring the quality of the impervious wall. If the pipe is extracted too early, the concrete has not yet solidified and cannot reach sufficient strength, which may lead to the collapse and fracture of the concrete, affecting the continuity and impervious performance of the impervious wall; if the pipe is extracted too late, the adhesion between the concrete and the pipe body increases, which will increase the difficulty of pipe extraction and may even cause the pipe body to be unable to be extracted. At present, the determination of the pipe extraction time and height mainly relies on construction experience and on-site tests, lacking scientific and accurate methods, and having many deficiencies. Judging the pipe extraction time based on construction experience, due to the differences and limitations of personal experience, there is often a large degree of uncertainty and error. Although on-site tests can reflect the solidification state of the concrete to a certain extent, the test process is complex, time-consuming, and can only provide discrete time point data, making it difficult to continuously monitor the solidification process of the concrete. The inaccuracy and unscientific nature of the existing pipe extraction technology are likely to bring many adverse consequences to the project. For example, problems such as the collapse and fracture of the concrete caused by too early pipe extraction (or too high pipe extraction height) will cause defects such as gaps, cracks, and hole collapses in the impervious wall, seriously affecting its impervious performance and increasing the maintenance cost and safety risk in the later stage of the project; while the problem of difficult pipe extraction caused by too late pipe extraction (or too low pipe extraction height) will not only delay the construction progress and increase the construction cost, but may also damage the concrete structure due to forced pipe extraction, reducing the overall quality and service life of the impervious wall. Summary of the Invention
[0003] The purpose of the present invention is to provide a method and system for step-by-step intelligent pipe extraction of side conduits of impervious walls, which can determine the optimal pipe extraction time and height, solve the problem of inaccurate pipe extraction time and height of impervious wall concrete in the prior art, and improve the construction quality and efficiency of impervious walls.
[0004] The above technical objectives of the present invention are achieved through the following technical solutions: In the first aspect, the present application provides a method for step-by-step intelligent pipe extraction of side conduits of impervious walls, including the following specific steps: Obtain the basic process parameters of the impervious wall concrete pouring according to the actual working conditions, and obtain the first relationship between the minimum pipe extraction time and the minimum compressive strength in the first layer of concrete based on the basic process parameters; Use low-field nuclear magnetic resonance technology to obtain the relaxation signal intensity of water molecules in the first layer of concrete, and deduce the degree of cement hydration of the first layer of concrete based on the relaxation signal intensity of water molecules; Based on the basic process parameters of the concrete pouring of the cutoff wall, the gel void ratio of the first layer of concrete at different times is calculated according to the degree of cement hydration, and the test compressive strength at different times obtained from the compressive test of the hardened cement specimens is used to perform a power function fitting on the gel void ratio and the test compressive strength at the same time, so as to obtain the second relationship between the compressive strength of the cement paste specimen and time; Substitute the minimum pipe extraction time into the second relationship between the compressive strength of the cement paste specimen and time to obtain the third relationship between the minimum pipe extraction time and the compressive strength of the cement paste specimen; Use the first relationship and the third relationship to respectively draw the load curve and the strength curve, solve the intersection point of the load curve and the strength curve, determine the target pipe extraction time of the first layer of concrete as the time in the solution result, and calculate from the start mixing time of the first layer of concrete, and when the duration to the target pipe extraction time is reached, perform pipe extraction treatment on the cutoff wall side conduit of the first layer of concrete; Repeat the above steps to perform sequential step-by-step pipe extraction on the cutoff wall side conduits of the concrete structures of multiple continuous layers until the cutoff wall side conduits of the concrete structures of these multiple layers are completely extracted.
[0005] On the basis of the above technical solution, the present invention can also be improved as follows.
[0006] Further, the above basic process parameters include the cutoff wall groove section length L, the cutoff wall groove section width D, the cutoff wall groove section depth H, the single bin production capacity M of the concrete mixing plant, the pouring speed V, the density ρ1 of the concrete mixture, and the density ρ2 of the slurry.
[0007] Further, the above first relationship is specifically: ; In the formula, represents the minimum compressive strength, represents the minimum pipe extraction time, L represents the cutoff wall groove section length, D represents the cutoff wall groove section width, H represents the cutoff wall groove section depth, M represents the single bin production capacity of the concrete mixing plant, V represents the pouring speed, ρ1 represents the density of the concrete mixture, and ρ2 represents the density of the slurry.
[0008] Further, the degree of cement hydration of the above first layer of concrete is specifically: ; In the formula, represents the degree of cement hydration at time t, I0 represents the relaxation signal intensity at the beginning of hydration, I t represents the relaxation signal intensity at time t, γ represents the water-cement ratio required for complete hydration of cement, and w / c represents the water-cement ratio at time t.
[0009] Further, the void ratio of the gel at different times is specifically as follows: ; In the formula, V sg and V c respectively represent the volume of the saturated gel and the volume of the unhydrated cement; w / c represents the water-cement ratio at time t; α t is the degree of cement hydration at time t, and X represents the void ratio of the gel at time t.
[0010] Further, the above second relationship is specifically as follows: ; In the formula, σ t represents the compressive strength of the cement paste specimen at time t, A and n are fitting constants, V sg and V c respectively represent the volume of the saturated gel and the volume of the unhydrated cement, γ represents the water-cement ratio required for complete hydration of the cement, f(t) represents the total signal of the relaxation signal intensity at time t, and f(t0) represents the total signal of the relaxation signal intensity at time t0.
[0011] Further, the above third relationship is specifically as follows: ; In the formula, σ min represents the compressive strength of the cement paste specimen at the minimum pipe extraction time T min , f(T min ) represents the total signal of the relaxation signal intensity at time T min , f(t0) represents the total signal of the relaxation signal intensity at time t0, A and n are fitting constants, V sg and V c respectively represent the volume of the saturated gel and the volume of the unhydrated cement, and γ represents the water-cement ratio required for complete hydration of the cement.
[0012] On the second aspect, the present application provides an intelligent pipe extraction system with a stepped side catheter for a cutoff wall, which is applied to an intelligent pipe extraction method with a stepped side catheter for a cutoff wall according to any one of the first aspect, and includes: A first module, configured to obtain the basic process parameters of the cutoff wall concrete pouring according to the actual working conditions, and obtain the first relationship between the minimum pipe extraction time and the minimum compressive strength in the first layer of concrete according to the basic process parameters; A second module, configured to obtain the relaxation signal intensity of water molecules in the first layer of concrete by using low-field nuclear magnetic resonance technology, and deduce the degree of cement hydration of the first layer of concrete based on the relaxation signal intensity of water molecules; The third module is used to calculate the gel-void ratio of the first layer of concrete at different times based on the basic process parameters of the impervious wall concrete pouring, and perform a power function fitting on the gel-void ratio and the measured compressive strength at the same time according to the measured compressive strength at different times obtained from the compressive test of the hardened cement specimen, so as to obtain the second relationship between the compressive strength of the cement paste specimen and time; The fourth module is used to substitute the minimum pipe extraction time into the second relationship between the compressive strength of the cement paste specimen and time to obtain the third relationship between the minimum pipe extraction time and the compressive strength of the cement paste specimen; The fifth module is used to respectively draw a load curve and a strength curve by using the first relationship and the third relationship, solve the intersection point of the load curve and the strength curve, determine the target pipe extraction time of the first layer of concrete from the solution result, and calculate from the start mixing time of the first layer of concrete to the duration of the target pipe extraction time, and then perform pipe extraction treatment on the side conduit of the impervious wall of the first layer of concrete; The sixth module is used to repeatedly execute the first module to the fifth module to perform sequential step-by-step pipe extraction on the side conduits of the impervious walls of consecutive multi-layer concrete structures until the side conduits of the impervious walls of the multi-layer concrete structures are completely extracted.
[0013] In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method according to any one of the first aspects is implemented.
[0014] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium. The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the method according to any one of the first aspects.
[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In this application, first, based on the basic technological parameters obtained for the cast-in-place concrete of the impervious wall, the first relationship between the minimum pipe-lifting time and the minimum compressive strength in the first layer of concrete is fitted. The basic technological parameters for the cast-in-place concrete of the impervious wall may include the length of the impervious wall segment, the width of the impervious wall segment, the depth of the impervious wall segment, the single-bin production capacity of the concrete mixing plant, the pouring speed, the density of the concrete mixture, and the density of the slurry, etc.; second, using low-field nuclear magnetic resonance technology and based on the measured compressive strengths at different times obtained from the compressive tests of hardened cement specimens, the gel-void ratio and the measured compressive strength at the same time are fitted by a power function to obtain the second relationship between the compressive strength of the cement paste specimen and time. Then, the minimum pipe-lifting time in the first relationship is substituted into the second relationship to obtain the third relationship between the minimum pipe-lifting time and the compressive strength of the cement paste specimen; finally, by plotting the curves of the first relationship and the third relationship respectively, the load curve and the strength curve are obtained. The abscissas of both curves are time. By solving the abscissa of the intersection point of the two curves, the optimal pipe-lifting time, that is, the target pipe-lifting time, is obtained; finally, the pipe-lifting height is obtained based on the basic technological parameters. The pipe-lifting height is the same as the height of the first layer of concrete, which is H min =M / (L·D).
[0016] In this application, low-field nuclear magnetic resonance technology is used to monitor the hydration process and strength development of the impervious wall concrete in real time and non-destructively; by detecting the relaxation characteristics of hydrogen protons in the concrete, this technology can indirectly reflect the state and migration of internal moisture in the concrete, and then accurately infer the hydration process and strength development state of the concrete, which provides a scientific and accurate basis for determining the pipe-lifting time, overcoming the uncertainty and error of relying on construction experience in the prior art, as well as the complexity and discreteness of on-site tests.
[0017] In this application, through the established pipe-lifting time prediction model, the pipe-lifting time can be quickly and accurately determined based on on-site detection data. This not only improves the construction efficiency, reduces construction delays caused by uncertain pipe-lifting time, but also reduces construction risks, such as concrete collapse and fracture caused by premature pipe-lifting, or difficulties in pulling out the pipe body caused by too late pipe-lifting, etc.
[0018] In this application, the method and system of the present invention have a simple operation process, which is easy to understand and implement. It only needs to obtain parameters, calculate relationships, establish a model, and determine the pipe-lifting time and height according to the specified steps. This simplicity enables it to be widely applied to the construction of impervious walls in water conservancy and hydropower projects, and has good popularization and application value. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings: Figure 1 It is the flowchart of the pipe extraction method in the embodiment of the present invention; Figure 2 It is the schematic diagram of the concrete pouring of the impervious wall in the embodiment of the present invention; Figure 3 It is the schematic diagram of the load curve and the strength curve in the embodiment of the present invention; Figure 4 It is the connection schematic diagram of the pipe extraction system in the embodiment of the present invention. Detailed implementation manners
[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.
[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.
[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0023] In the description of the embodiments of the present invention, "a plurality of" represents at least two.
[0024] Low-field nuclear magnetic resonance technology (LF-NMR) is a non-destructive testing technology that can be used to study the state and distribution of moisture inside concrete. During the hydration process of concrete, as the hydration reaction proceeds, the free water inside the concrete is gradually consumed and converted into bound water, and significant changes will occur in the state and distribution of moisture. By detecting the relaxation characteristics of hydrogen protons in concrete using low-field nuclear magnetic resonance technology, the state and migration of moisture inside the concrete can be indirectly reflected, and then the hydration process and strength development of the concrete can be inferred. Since this technology has the advantages of being non-destructive, fast, accurate, etc., it can monitor the hydration process of concrete in real time and continuously, thereby providing a scientific basis for determining the pipe extraction time and pipe extraction height of the impervious wall concrete.
[0025] Example 1: The principles for determining the theoretical optimal pipe extraction time and pipe extraction height of diaphragm wall concrete generally need to consider multiple factors comprehensively to ensure that the concrete has sufficient strength to maintain the stability of the hole wall and avoid difficulties or problems caused by too late pipe extraction. Generally speaking, the optimal pipe extraction time is not equal to the initial setting time of the concrete, but the time when the concrete can be formed under a certain pressure. To determine the theoretical optimal pipe extraction time, samples need to be taken at the start of concrete pouring and its setting and forming conditions observed. When the concrete strength is sufficient to bear the weight of the upper concrete, the age of this test block can be defined as the minimum pipe extraction age.
[0026] Specifically, in order to be able to determine the optimal pipe extraction time and pipe extraction height, and thus solve the problem of inaccurate pipe extraction time and pipe extraction height of diaphragm wall concrete in the prior art, and improve the construction quality and efficiency of the diaphragm wall, this embodiment provides a step-by-step intelligent pipe extraction method for side conduits of diaphragm walls, as Figure 1 shown, including the following specific steps: S1, obtain the basic process parameters of diaphragm wall concrete pouring according to the actual working conditions, and obtain the first relationship between the minimum pipe extraction time and the minimum compressive strength in the first layer of concrete based on the basic process parameters.
[0027] Among them, before pipe extraction, first, according to the actual working conditions, obtain the basic process parameters of diaphragm wall concrete pouring, including the length L (unit: m) of the diaphragm wall slot section, width D (unit: m), depth H (unit: m), the single-bin production capacity M (unit: m 3 ) of the concrete mixing plant, continuous concrete pouring is adopted, the pouring speed V (unit: m 3 / min), the density ρ1 (unit: kg / m 3 ) of the concrete mixture, and the density ρ2 (unit: kg / m 3 ) of the slurry.
[0028] Specifically, calculate the relationship between the minimum compressive strength σ min (unit: MPa) of the concrete and T min as follows: Although the pouring of diaphragm wall concrete is a continuous process, the pouring time of diaphragm wall concrete is relatively long. Calculating the hydration age from the start of concrete mixing, the age differences of concrete in different pouring layers are relatively large. The pouring of diaphragm wall concrete can be regarded as step-by-step pouring. As Figure 2 shown, the diaphragm wall is composed of concrete layers with different ages. Although the ages of each layer of concrete are different, the strength development laws are the same. The time when the first batch of concrete starts mixing is recorded as the 0 moment. The first batch of concrete corresponds to the first layer of concrete. The theoretical minimum pipe extraction time T min of the first layer of concrete is the time when the compressive strength of the first layer of concrete is equal to the upper load pressure. From the actual working conditions, at T minAt this moment, the upper load of the first layer of concrete is the sum of the gravity of the upper concrete and the slurry. The volume of the first layer of concrete is M, and the volume of the upper concrete is V·T min -M, the gravity of the upper concrete is (V·T min -M)·ρ1·g, the gravity of the upper slurry is (L·D·H - V·T min )·ρ2·g, and the upper load of the first layer of concrete is (V·T min -M)·ρ1·g + (L·D·H - V·T min )·ρ2·g. Therefore, the minimum compressive strength of the first layer of concrete at time T min can be obtained and expressed as the first relationship.
[0029] Optionally, the above first relationship is specifically: ; In the formula, represents the minimum compressive strength, represents the minimum pipe extraction time, L represents the length of the cutoff wall segment, D represents the width of the cutoff wall segment, H represents the depth of the cutoff wall segment, M represents the single - bin production capacity of the concrete mixing plant, V represents the pouring speed, ρ1 represents the density of the concrete mixture, and ρ2 represents the density of the slurry.
[0030] S2, use low - field nuclear magnetic resonance technology to obtain the relaxation signal intensity of water molecules in the first layer of concrete, and deduce the degree of cement hydration of the first layer of concrete based on the relaxation signal intensity of water molecules.
[0031] Among them, using nuclear magnetic resonance technology to establish the relationship between concrete strength and time includes the following: Low - field nuclear magnetic resonance technology can sensitively and accurately monitor the hydration process and to a certain extent reflect the changes in the internal microstructure of the material. The relaxation signal intensity of water molecules in low - field nuclear magnetic resonance can continuously characterize the hydration process, and further deduce the degree of cement hydration from the relaxation signal intensity.
[0032] Optionally, the degree of cement hydration of the first layer of concrete is specifically: ; In the formula, represents the degree of cement hydration at time t, I0 represents the relaxation signal intensity at the beginning of hydration, I t represents the relaxation signal intensity at time t, γ represents the water - cement ratio required for complete hydration of cement, and w / c represents the water - cement ratio at time t.
[0033] S3. Based on the basic process parameters of the impervious wall concrete pouring, calculate the gel-void ratio of the first layer of concrete at different times according to the degree of cement hydration, and perform a power function fitting on the gel-void ratio and the measured compressive strength at different times obtained from the compressive tests of hardened cement specimens to obtain the second relationship between the compressive strength of the cement paste specimen and time.
[0034] Among them, the typical relationship between the gel-void ratio and the compressive strength proposed by Power can be adopted to make the connection between the microscopic structure and macroscopic properties of cement possible; the gel-void ratio is closely related to the degree of cement hydration and the water-cement ratio, and directly affects the macroscopic mechanical properties of the hardened cement specimen paste. It can be used to characterize the ratio of the volume of gel after cement hydration to the total volume of hydrated cement and pores.
[0035] Optionally, the gel-void ratio at different times is specifically: ; In the formula, V sg and V c respectively represent the volume of saturated gel and the volume of unhydrated cement; w / c represents the water-cement ratio at time t; α t is the degree of cement hydration at time t, and X represents the gel-void ratio at time t.
[0036] Among them, the low-field nuclear magnetic resonance instrument can continuously measure the change law of the total signal I of cement hydration with time I = f(t). Through the calculation formula of the degree of cement hydration and the calculation formula of the gel-void ratio, the gel-void ratio X of cement at time t can be obtained t , and the compressive strength σ of cement at time t can be obtained by performing a compressive test on the hardened cement specimen t . By performing a power function fitting on the gel-void ratio X t and the compressive strength σ t at time t, the relationship between the compressive strength of the cement paste specimen and time can be obtained, which is expressed as the second relationship.
[0037] Optionally, the above second relationship is specifically: ; In the formula, σ t represents the compressive strength of the cement paste specimen at time t, A and n are fitting constants, V sg and V c respectively represent the volume of saturated gel and the volume of unhydrated cement, γ represents the water-cement ratio required for complete hydration of cement, f(t) represents the total signal of the relaxation signal intensity at time t, and f(t0) represents the total signal of the relaxation signal intensity at time t0.
[0038] S4. Substitute the minimum pipe extraction time into the second relationship between the compressive strength of the cement paste specimen and time to obtain the third relationship between the minimum pipe extraction time and the compressive strength of the cement paste specimen.
[0039] Among them, when t = T min , the compressive strength σ of the first-layer concrete at time T min can be expressed as the third relationship: min Specifically, the above-mentioned third relationship is: In the formula, σ ; where σ min represents the compressive strength of the cement paste specimen at the minimum pipe extraction time T min , f(T min ) represents the total amount of relaxation signal intensity at time T min , f(t0) represents the total amount of relaxation signal intensity at time t0, A and n are fitting constants, V sg and V c respectively represent the volume of the saturated gel and the volume of the unhydrated cement, and γ represents the water-cement ratio required for complete hydration of the cement.
[0040] S5. Use the first relationship and the third relationship to respectively plot the load curve and the strength curve, solve for the intersection point of the load curve and the strength curve, determine the target pipe extraction time of the first-layer concrete from the solution result, and calculate the duration from the start mixing time of the first-layer concrete to the target pipe extraction time, and then perform pipe extraction treatment on the guide pipe on the diaphragm wall side of the first-layer concrete.
[0041] Among them, according to the calculation formulas of the first relationship and the third relationship, the load curve and the strength curve can be respectively plotted. As Figure 3 shown, the intersection point of the load curve and the strength curve is the minimum pipe extraction time T min . The minimum pipe extraction time T of the first-layer concrete can be calculated by solving a system of binary linear equations. min The pipe extraction height H min is the same as the height of the first-layer concrete, that is, H min = M / (L·D). In the formula, M represents the single-bin production capacity of the concrete mixing plant, L represents the length of the diaphragm wall trench section, and D represents the width of the diaphragm wall trench section.
[0042] S6. Repeat the above steps to perform sequential step-by-step pipe extraction on the guide pipes on the diaphragm wall side of the continuous multi-layer concrete structure until the guide pipes on the diaphragm wall side of the multi-layer concrete structure are completely extracted.
[0043] Specifically, the pipe extraction time and pipe extraction height of the i-th layer of concrete can be calculated according to the steps of S1-S5, realizing the step-by-step pipe extraction from the first layer of concrete to the i-th layer of concrete until the side conduit is completely extracted; among them, the pipe extraction test results of structures with different basic process parameters according to the above steps are as follows: 1. The length of the impervious wall groove section: 3 m, the width: 1.2 m, the depth: 150 m; the single-bin production capacity of the concrete mixing plant: 8 m 3 ; the pouring speed: 0.5 m 3 / min; the density of the concrete mixture: 2300 kg / m 3 ; the density of the slurry: 1100 kg / m 3 . The pipe extraction time T of the first layer of concrete determined by the present invention min = 540 min, the pipe extraction height H min = 2.22 m, and there are no problems such as hole collapse or pipe casting after pipe extraction.
[0044] 2. The length of the impervious wall groove section: 4 m, the width: 1.5 m, the depth: 180 m; the single-bin production capacity of the concrete mixing plant: 12 m 3 ; the pouring speed: 0.8 m 3 / min; the density of the concrete mixture: 2350 kg / m 3 ; the density of the slurry: 1150 kg / m 3 . The pipe extraction time T of the first layer of concrete determined by the present invention min = 720 min, the pipe extraction height H min = 2 m, and there are no problems such as hole collapse or pipe casting after pipe extraction.
[0045] 3. The length of the impervious wall groove section: 4.5 m, the width: 1.6 m, the depth: 220 m; the single-bin production capacity of the concrete mixing plant: 15 m 3 ; the pouring speed: 1 m 3 / min; the density of the concrete mixture: 2450 kg / m 3 ; the density of the slurry: 1250 kg / m 3 . The pipe extraction time T of the first layer of concrete determined by the present invention min = 900 min, the pipe extraction height H min = 2.08 m, and there are no problems such as hole collapse or pipe casting after pipe extraction.
[0046] For the first test above, a comparative example was also made, that is, under the first pipe extraction time determined by the traditional empirical method: The length of the impervious wall groove section: 3 m, the width: 1.2 m, the depth: 150 m; the single-bin production capacity of the concrete mixing plant: 8 m 3 ; the pouring speed: 0.5 m 3 / min; Density of concrete mixture: 2300 kg / m 3 ; Mud density: 1100 kg / m 3 . The first pipe extraction time T determined by the traditional empirical method min = 600 min, the pipe extraction height H min = 4 m, and the phenomenon of hole collapse occurred after pipe extraction.
[0047] In summary, in this embodiment, the low-field nuclear magnetic resonance technology is used to monitor the hydration process and strength development of the cut-off wall concrete in real time and non-destructively; this technology can indirectly reflect the state and migration of internal moisture in the concrete by detecting the relaxation characteristics of hydrogen protons in the concrete, and then accurately infer the hydration process and strength development state of the concrete, which provides a scientific and accurate basis for determining the pipe extraction time, overcoming the uncertainty and error of the existing judgment based on construction experience, as well as the complexity and discreteness of on-site tests.
[0048] Embodiment 2: The embodiment of the present application provides a side duct step-type intelligent pipe extraction system for cut-off walls, which is applied to a side duct step-type intelligent pipe extraction method of any one of the embodiments 1, as Figure 4 shown, including: The first module is used to obtain the basic process parameters of the cut-off wall concrete pouring according to the actual working conditions, and obtain the first relationship between the minimum pipe extraction time and the minimum compressive strength in the first layer of concrete according to the basic process parameters.
[0049] The second module is used to obtain the relaxation signal intensity of water molecules in the first layer of concrete by using the low-field nuclear magnetic resonance technology, and deduce the degree of cement hydration of the first layer of concrete based on the relaxation signal intensity of water molecules.
[0050] The third module is used to calculate the gel-space ratio of the first layer of concrete at different times according to the degree of cement hydration based on the basic process parameters of the cut-off wall concrete pouring, and perform power function fitting on the gel-space ratio and the measured compressive strength at the same time according to the measured compressive strength at different times of the hardened cement specimen, so as to obtain the second relationship between the compressive strength of the cement paste specimen and time.
[0051] The fourth module is used to substitute the minimum pipe extraction time into the second relationship between the compressive strength of the cement paste specimen and time to obtain the third relationship between the minimum pipe extraction time and the compressive strength of the cement paste specimen.
[0052] The fifth module is used to respectively generate a load curve and a strength curve by using the first relationship and the third relationship, solve the intersection point of the load curve and the strength curve, determine the target pipe extraction time of the first-layer concrete based on the time in the solution result, and perform pipe extraction on the side conduit of the diaphragm wall of the first-layer concrete when the duration from the start mixing time of the first-layer concrete to the target pipe extraction time is reached.
[0053] The sixth module is used to repeatedly execute the first module to the fifth module to perform step-by-step pipe extraction on the side conduits of the diaphragm walls of consecutive multi-layer concrete structures until the side conduits of the diaphragm walls of the multi-layer concrete structures are completely extracted.
[0054] Embodiment 3: An embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method according to any one of Embodiment 1 is implemented.
[0055] Embodiment 4: An embodiment of the present application provides a non-transitory computer-readable storage medium. The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the method according to any one of Embodiment 1.
[0056] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A method for step-by-step intelligent pipe extraction of side conduits of a cutoff wall, characterized in that It includes the following specific steps: Obtain the basic process parameters for the concrete pouring of the impervious wall according to the actual working conditions, and obtain the first relationship between the minimum pipe extraction time and the minimum compressive strength in the first layer of concrete based on the basic process parameters; Use low-field nuclear magnetic resonance technology to obtain the relaxation signal intensity of water molecules in the first layer of concrete, and deduce the degree of cement hydration of the first layer of concrete based on the relaxation signal intensity of the water molecules; Based on the basic process parameters for the concrete pouring of the impervious wall, calculate the gel-void ratio of the first layer of concrete at different times according to the degree of cement hydration, and perform power function fitting on the gel-void ratio and the measured compressive strength at the same time based on the measured compressive strength at different times obtained from the compressive test of hardened cement specimens, to obtain the second relationship between the compressive strength of the cement paste specimen and time; Substitute the minimum pipe extraction time into the second relationship between the compressive strength of the cement paste specimen and time to obtain the third relationship between the minimum pipe extraction time and the compressive strength of the cement paste specimen; Use the first relationship and the third relationship to respectively draw a load curve and a strength curve, solve the intersection point of the load curve and the strength curve, determine the target pipe extraction time of the first layer of concrete from the solution result, and calculate from the start mixing time of the first layer of concrete, and perform pipe extraction treatment on the side conduit of the impervious wall of the first layer of concrete when the duration reaches the target pipe extraction time; Repeat the above steps to perform sequential step-by-step pipe extraction on the side conduits of the impervious walls of consecutive multi-layer concrete structures until the side conduits of the impervious walls of the multi-layer concrete structures are completely extracted.
2. The intelligent pulling method of the side conduit step-by-step for the impervious wall according to claim 1, characterized in that, The basic process parameters include the length L of the impervious wall groove section, the width D of the impervious wall groove section, the depth H of the impervious wall groove section, the single-bin production capacity M of the concrete mixing plant, the pouring speed V, the density ρ1 of the concrete mixture, and the density ρ2 of the slurry.
3. A method for stepwise intelligent pipe extraction of side conduits of a cut-off wall according to claim 2, characterized in that, The first relationship is specifically: ； In the formula, represents the minimum compressive strength, represents the minimum pipe extraction time, L represents the length of the cutoff wall section, D represents the width of the cutoff wall section, H represents the depth of the cutoff wall section, M represents the single-bin production capacity of the concrete mixing plant, V represents the pouring speed, ρ1 represents the density of the concrete mixture, and ρ2 represents the density of the slurry.
4. A method for step-by-step intelligent tube pulling of side conduits of a cutoff wall according to claim 1, characterized in that The degree of cement hydration of the first layer of concrete is specifically: ； In the formula, represents the degree of cement hydration at time t, I0 represents the relaxation signal intensity at the beginning of hydration, and I t represents the relaxation signal intensity at time t, γ represents the water-cement ratio required for complete hydration of cement, and w / c represents the water-cement ratio at time t.
5. A method for step-by-step intelligent pipe extraction of side conduits of a cut-off wall according to claim 1, characterized in that, The gel-void ratio at different times is specifically: ； where, V sg and V c represent the volume of the saturated gel and the volume of the unhydrated cement, respectively; w / c represents the water-cement ratio at time t; α t is the degree of cement hydration at time t, and X represents the gel-space ratio at time t.
6. The intelligent pulling method of the side conduit of the cutoff wall by step is characterized in that, according to claim 2 The second relationship is specifically: ； Where, σ t represents the compressive strength of the cement paste specimen at time t, A and n are fitting constants, V sg and V c represent the volume of the saturated gel and the volume of the unhydrated cement respectively, γ represents the water-cement ratio required for complete hydration of the cement, f(t) represents the total amount of the relaxation signal intensity at time t, and f(t0) represents the total amount of the relaxation signal intensity at time t0.
7. A method for stepwise intelligent pipe extraction of side conduits of a cut-off wall according to claim 1, characterized in that The third relationship is specifically: ； Where, σ min represents the compressive strength of the cement paste specimen at the minimum pipe extraction time T min , f(T min ) represents the total amount of relaxation signal intensity at time T min , f(t0) represents the total amount of relaxation signal intensity at time t0, A and n are fitting constants, V sg and V c represent the volume of the saturated gel and the volume of the unhydrated cement respectively, and γ represents the water-cement ratio required for complete hydration of the cement.
8. An intelligent pipe pulling system with a stepped side conduit for a cut-off wall, which is applied to the intelligent pipe pulling method with a stepped side conduit for a cut-off wall described in any one of claims 1-7, and is characterized in that It includes: The first module is used to obtain the basic process parameters for the concrete pouring of the impervious wall according to the actual working conditions, and obtain the first relationship between the minimum pipe extraction time and the minimum compressive strength in the first layer of concrete based on the basic process parameters; The second module is used to use low-field nuclear magnetic resonance technology to obtain the relaxation signal intensity of water molecules in the first layer of concrete, and deduce the degree of cement hydration of the first layer of concrete based on the relaxation signal intensity of the water molecules; The third module is used to calculate the gel-void ratio of the first layer of concrete at different times based on the basic process parameters for the concrete pouring of the impervious wall according to the degree of cement hydration, and perform power function fitting on the gel-void ratio and the measured compressive strength at the same time based on the measured compressive strength at different times obtained from the compressive test of hardened cement specimens, to obtain the second relationship between the compressive strength of the cement paste specimen and time; The fourth module is used to substitute the minimum pipe extraction time into the second relationship between the compressive strength of the cement paste specimen and time to obtain the third relationship between the minimum pipe extraction time and the compressive strength of the cement paste specimen; The fifth module is used to respectively generate a load curve and a strength curve by using the first relationship and the third relationship, solve the intersection point of the load curve and the strength curve, determine the target pipe extraction time of the first layer of concrete from the solution result, and calculate the duration from the start mixing time of the first layer of concrete to the target pipe extraction time, and then perform pipe extraction treatment on the anti-seepage wall side conduit of the first layer of concrete; The sixth module is used to repeatedly execute the first module to the fifth module to perform sequential step-by-step pipe extraction on the anti-seepage wall side conduits of consecutive multi-layer concrete structures until the anti-seepage wall side conduits of the multi-layer concrete structures are completely extracted.
9. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method described in any one of claims 1-7 is implemented.
10. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the method described in any one of claims 1-7.