Ultra-high performance concrete compaction type reinforcing and repairing method with low environmental influence

Abstract

The invention relates to an ultra-high performance concrete compaction type reinforcing and repairing method with low environmental influence. The method comprises the steps that firstly, the surface of an existing building structure to be reinforced and repaired is subjected to scabbling treatment and divided into three areas from left to right according to the total horizontal length; 2, cleaning a chiseling surface; 3, fixing a steel template on the roughened surface; 4, preparing ultra-high performance concrete; 5, the ultra-high performance concrete is placed into the three grouters respectively, and the grouters are started to start continuous pouring construction; sixthly, a PLC is provided, basic parameters such as horizontal pouring endpoint coordinates, the average chiseling thickness and the pouring time are collected in real time, and the optimal pouring flow of the grouters in different areas is calculated in real time according to built-in pouring construction quality control equations based on height-flow cooperative control in different stages. And the optimal pouring flow information is fed back to the grouting machine in real time, the pouring speed of the grouting machine is adjusted in real time, and it is ensured that the pouring height deviation of all the areas is within the scientific controllable range till reinforcing and repairing construction is finished.

Description

Technical Field

[0001] The present invention belongs to the technical field of urban renewal, and particularly relates to a super high performance concrete compaction reinforcement and repair method with low environmental impact. Background Art

[0002] With the continuous acceleration of the urbanization process, the infrastructure and buildings in many cities (such as urban elevated crash barriers, etc.) are facing increasingly serious aging problems, mainly manifested as cracks, spalling, wear and corrosion in concrete structures, which greatly affect the safety and service life of buildings. Therefore, the importance of urban renewal has become increasingly prominent.

[0003] Currently, for the quality problems brought about by the increasing aging of existing urban building structures (such as urban elevated crash barriers, etc.), two methods are mainly adopted: overall replacement and material repair. However, these two methods have certain defects: (1) For the overall replacement method, its construction period is long, the cost is high, there is a lot of material waste, the construction equipment occupies a large area, and it has a great impact on the surrounding environment and traffic; (2) For traditional material repair methods, such as using ordinary concrete, mortar and other materials, not only the structural repair strength is insufficient, the interface bonding effect is not ideal, and it depends on interface strengthening agents, but also the traditional "pouring" construction process from top to bottom often has the phenomenon of "wall hanging" of materials, which easily leads to poor density and homogeneity of the repair layer structure, a decline in the long-term durability performance of the structural layer, and then causes structural diseases such as cracking and spalling, ultimately affecting structural safety.

[0004] Therefore, how to provide a super high performance concrete compaction reinforcement and repair method with low environmental impact is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] The present invention provides a super high performance concrete compaction reinforcement and repair method with low environmental impact. Using super high performance concrete as the reinforcement and repair material, adopting a "compaction type" pouring construction process from bottom to top, combined with a pouring construction quality control method based on height-flow collaborative control, it effectively solves the quality problems such as poor density and homogeneity of the repair structure layer, easy shrinkage cracking, insufficient mechanical and durability performance caused by the "wall hanging" phenomenon of the repair material in the traditional "pouring" construction process, overcomes the defects of insufficient structural body strength of traditional repair materials and the bonding strength between them and existing building structures, and high dependence on interface strengthening agents, effectively reduces the impact of the construction process on the surrounding environment and transportation, and strongly promotes the high-quality and sustainable development in the field of urban renewal.

[0006] To solve the above technical problems, the present invention includes the following technical solutions: A super high performance concrete compaction reinforcement and repair method with low environmental impact, comprising the following steps: Step S1: Rough the surface of the existing building structure to be strengthened and repaired, divide the roughened surface into several areas from left to right according to the total horizontal length, and record the average thickness, horizontal length and total height of the roughened surface of each area; Step S2: Clean the roughened surface until the surface reaches a wet state without obvious ponding; Step S3: Fix the steel formwork on the roughened surface, and the size of the steel formwork matches the roughened surface; Step S4: Prepare C120 grade steel fiber / high performance hybrid fiber concrete or C100 grade non-metallic fiber high performance concrete; Step S5: Provide three grouting machines, place the high performance concrete prepared in Step S4 into the grouting machines respectively, start the grouting machines to start continuous pouring construction, record the pouring time, grouting flow rate and cross-sectional area. The initial shape of the pouring cross-section is triangular, and then the cross-sectional shape evolves into pentagonal until the pouring construction is completed and the cross-sectional shape becomes rectangular; Step S6: During the pouring process, for the central area, calculate the real-time pouring height of this area according to parameters such as the pouring volume identity and the initial pouring flow rate. For the other two areas on both sides, obtain the pouring height control value of this area by taking random numbers. Further, according to the height-flow coordinated control pouring construction quality control equation derived from the pouring volume identity, calculate the pouring flow rate control value of the other two areas on both sides; Step S7: Provide a PLC controller, collect basic parameters such as the horizontal pouring end point coordinates, average roughening thickness, and pouring time in real time, combine with the built-in pouring construction quality control equation based on height-flow coordination at different stages, calculate the optimal pouring flow rate of the grouting machines in different areas in real time, and feedback the optimal pouring flow rate information to the grouting machines in real time. Through the automatic control system, adjust the pouring speed of the grouting machines in real time to ensure that the pouring height deviation in each area is within the scientifically controllable range, avoid the phenomenon of high performance concrete sticking to the wall, and effectively guarantee the construction quality of high performance concrete strengthening and repair until the end of the strengthening and repair construction.

[0007] Further, divide the roughened surface into 3 areas from left to right according to the total horizontal length, and record them as 1 # 、2 # 、3 # , the average roughening thickness of each area is recorded as d1, d2, d3, the horizontal length of each area is recorded as L1, L2, L3, and the total height of the roughened surface is recorded as H; the pouring time in Step S5 is recorded as T, the grouting flow rates are recorded as Q1, Q2, Q3 respectively, and the high performance concrete pouring cross-sectional areas are recorded as S1, S2, S3. The initial shape is triangular. Wait for L iWhen it is equal to L1, L2 or L3, the triangle reaches its maximum. After that, the cross-sectional shape evolves into a pentagon until the pouring construction is completed, and the cross-sectional shape becomes a rectangle. The pouring volume formula is V = S×d = Q×T. In the triangle stage, the total pouring height is denoted as H1 = h 1,i , H2 = h 2,i , H3 = h 3,i , at this time: For the 2 # area, according to the pouring volume formula, we get: V2 = 0.5×(L 2,b - L 2,a )×h 2,i ×d2 = Q2×T, then h 2,i = Q2×T / [0.5×(L 2,b - L 2,a )×d2]; For the 1 # , 3 # area, take h 1,i or h 3,i = rand(0.95×h 2,i , 1.05×h 2,i ) to ensure that the pouring heights of the three areas are consistent. According to the pouring volume formula, the pouring construction quality control equation based on height-flow coordinated control is derived: Q1 = 0.5×(L 1,b - L 1,a )×h 1,i ×d1 / T, Q3 = 0.5×(L 3,b - L 3,a )×h 3,i ×d3 / T; When the triangle reaches its maximum, the pouring height is denoted as h 1,imax , h 2,imax , h 3,imax ; In the pentagon stage, the pouring cross-section is divided into the top largest triangle and the lower rectangle. Among them, the height of the lower rectangle is denoted as h 1,k , h 2,k , h 3,k , and the total pouring height is denoted as H1 = h 1,imax + h 1,k , H2 = h 2,imax + h 2,k , H3 = h 3,imax + h 3,k , at this time: For the 2 # area, according to the pouring volume formula, we get: V2 = (0.5×L2×h 2,imax + L2×h 2,k) × d2 = Q2 × T, then h 2,k = Q2 × T / (L2 × d2) - 0.5 × h 2,imax , H2 = h 2,imax + h 2,k = Q2 × T / (L2 × d2) + 0.5 × h 2,imax ; For 1 # 、3 # area, take H1 or H3 = rand(0.95 × H2, 1.05 × H2) to ensure that the pouring heights of the three areas are consistent. According to the derivation of the pouring volume formula, the pouring construction quality control equation based on height - flow collaborative control is obtained: Q1 = (H1 - 0.5 × h 1,imax ) × L1 × d1 / T, Q3 = (H3 - 0.5 × h 3,imax ) × L3 × d3 / T, where d is the average chiseling thickness.

[0008] Furthermore, the step S3 includes: At the exact middle position of the bottom of each area of the steel formwork, there is a grouting hole. The bottom of the steel formwork is provided with several humidity sensors for real - time identification of the coordinates of the left and right pouring endpoints of the ultra - high performance concrete grout in the horizontal direction, denoted as L a 、L b , then the horizontal pouring distance of each area is L 1,i = L 1,b - L 1,a 、L 2,i = L 2,b - L 2,a 、L 3,i = L 3,b - L 3,a .

[0009] Furthermore, the inner surface of the steel formwork is flat, smooth and free of impurities.

[0010] Furthermore, through the step S7, an ultra - high performance concrete reinforcement and repair layer is formed, and the ultra - high performance concrete reinforcement and repair layer is located outside the matrix structure.

[0011] Compared with the prior art, the beneficial effects of the present invention: (1) The present invention provides a method for compacting and repairing ultra-high performance concrete with low environmental impact, and a casting construction quality control method based on height-flow collaborative control, which can scientifically and accurately control and coordinate the construction processes of different regions for reinforcement and repair, effectively avoid the "wall hanging" phenomenon of the reinforcement and repair materials between adjacent casting regions caused by the out-of-control casting height difference, thereby ensuring the homogeneity and density of the reinforcement and repair layer, and greatly improving the mechanical properties such as interface bonding and compressive strength and durability properties such as crack resistance of the reinforcement and repair layer, effectively meeting the structural safety requirements.

[0012] (2) Adopting the "compacting type" casting construction process from bottom to top and designing grouting holes at the bottom of the formwork can effectively avoid the "wall hanging" phenomenon caused by the traditional "pouring type" casting construction process from top to bottom. It can not only greatly improve the key properties such as the casting density, mechanical properties and durability of the reinforcement and repair layer, but also compared with the traditional "overall replacement" method, this process has low construction cost, less resource waste, small construction equipment, little impact on the surrounding environment, small floor area, short construction period, and can minimize the impact on urban traffic, with significant economic and social benefits.

[0013] (3) Using ultra-high performance concrete as the reinforcement and repair material, compared with traditional ordinary concrete, mortar and other materials, it not only has high mechanical strength of the repaired structural layer body, good crack resistance and impact resistance, but also has good bonding effect with the matrix interface, can get rid of the dependence on the interface enhancer, and the overall structure is safe and reliable after reinforcement and repair; at the same time, the ultra-high performance concrete repair structural layer has a fast setting speed and high early strength, which can greatly shorten the construction period, thus meeting the urgent need to open traffic as soon as possible. Description of the Drawings

[0014] Figure 1 It is the front view of the regional distribution in the method for compacting and repairing ultra-high performance concrete with low environmental impact in an embodiment of the present invention; Figure 2 It is the top view of the reinforcement and repair layer in the method for compacting and repairing ultra-high performance concrete with low environmental impact in an embodiment of the present invention; Figure 3 It is the front view of the triangular casting stage in the method for compacting and repairing ultra-high performance concrete with low environmental impact in an embodiment of the present invention; Figure 4 It is the front view of the pentagonal casting stage in the method for compacting and repairing ultra-high performance concrete with low environmental impact in an embodiment of the present invention.

[0015] In the figure, 1 - grouting machine; 2 - steel formwork; 3 - grouting hole; 4 - humidity sensor; 5 - PLC controller. Detailed Embodiments

[0016] The following further elaborates in detail on a method for compacting and repairing ultra-high performance concrete with low environmental impact provided by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer.

[0017] Example 1 The following in conjunction with Figure 1 , elaborates in detail on the method for compacting and repairing ultra-high performance concrete with low environmental impact of the present invention.

[0018] A method for compacting and repairing ultra-high performance concrete with low environmental impact includes the following steps: Step S1: Treat the surface of the existing building structure to be strengthened and repaired by chiseling in an artificial / machine manner, and divide the chiseled surface into 3 regions (1 # , 2 # , 3 # ) from left to right according to the horizontal total length L. The average chiseling thickness of each region is denoted as d1, d2, d3, the horizontal length of each region is denoted as L1, L2, L3, and the total height of the chiseled surface is denoted as H; Step S2: After using a vacuum pump to blow and remove the floating ash and debris on the chiseled surface, wash the chiseled surface with water until the surface reaches a state of being wet and having no obvious accumulated water; Step S3: Install and fix the steel formwork 2 on the chiseled surface. The horizontal length of the steel formwork 2 and its regional division are exactly the same as those of the chiseled surface. At the exact middle position of the bottom of each region of the steel formwork 2, there is 1 grouting hole 3, a total of 3. There are several humidity sensors 4 at the bottom of the steel formwork 2, which are used to identify the coordinates of the left and right pouring endpoints of the ultra-high performance concrete grouting material in the horizontal direction, denoted as L a , L b . Then the horizontal pouring distance of each region is L1,i = L 1,b - L 1,a , L 2,i = L 2,b - L 2,a , L 3,i = L 3,b - L 3,a . The inner surface of the steel formwork 2 is flat, smooth, and free of impurities; Step S4: Prepare C120 grade steel fiber / hybrid fiber ultra-high performance concrete or C100 grade non-metallic fiber ultra-high performance concrete; Step S5: Provide 3 grouting machines 1. Each grouting machine 1 is responsible for the grouting work of 1 region. Place the ultra-high performance concrete into the grouting machine, start the grouting machine to start continuous pouring construction. The pouring time is denoted as T, the grouting flow rates are denoted as Q1, Q2, Q3, and the pouring cross-sectional areas of the ultra-high performance concrete are denoted as S1, S2, S3. The initial shape is triangular. Wait for L iWhen it is equal to L1, L2 or L3, the triangle reaches its maximum. After that, the cross-sectional shape evolves into a pentagon until the pouring construction is completed, and the cross-sectional shape becomes a rectangle. The pouring volume formula is V = S×d = Q×T; Specifically, in the triangle stage, the total pouring height is denoted as H1 = h 1,i 、H2 = h 2,i 、H3 = h 3,i , at this time: 1) For the 2 # area, according to the pouring volume formula, we can get: V2 = 0.5×(L2, b -L2, a )×h 2,i ×d2 = Q2×T, then h 2,i = Q2×T / [0.5×(L2, b -L2, a )×d2]; 2) For the 1 # 、3 # areas, take h 1,i or h 3,i = rand(0.95×h 2,i , 1.05×h 2,i ) to ensure that the pouring heights of the three areas are the same, thus effectively avoiding the "wall hanging" phenomenon. Then, based on the pouring volume formula, the pouring construction quality control equation based on height-flow coordinated control can be derived: Q1 = 0.5×(L1, b -L1, a )×h 1,i ×d1 / T, Q3 = 0.5×(L3, b -L3, a )×h 3,i ×d3 / T; 3) When the triangle reaches its maximum, the pouring height is denoted as h 1,imax 、h 2,imax 、h 3,imax ; Similarly, in the pentagon stage, the pouring cross-section is divided into the top largest triangle and the lower rectangle. The height of the lower rectangle is denoted as h 1,k 、h 2,k 、h 3,k , and the total pouring height is denoted as H1 = h 1,imax +h 1,k 、H2 = h 2,imax +h 2,k 、H3 = h 3,imax +h 3,k , at this time: For the 2 # area, according to the pouring volume formula, we can get: V2=(0.5×L2×h 2,imax +L2×h 2,k )×d2=Q2×T, then h 2,k =Q2×T / (L2×d2)-0.5×h 2,imax , H2=h 2,imax +h 2,k =Q2×T / (L2×d2)+0.5×h 2,imax ; 2) For areas 1 # and 3 # , take H1 or H3 = rand(0.95×H2, 1.05×H2) to ensure that the pouring heights in the three areas are kept consistent, thus effectively avoiding the "wall hanging" phenomenon. Then, based on the pouring volume formula, the pouring construction quality control equation based on height-flow coordinated control can be derived: Q1=(H1 - 0.5×h 1,imax )×L1×d1 / T, Q3=(H3 - 0.5×h 3,imax )×L3×d3 / T; Step S6: Provide one PLC controller 5 to collect in real time various basic parameters such as the coordinates of the horizontal pouring end point, the average thickness of roughening, and the pouring time. Combine with the built-in pouring construction quality control equations based on height-flow coordinated control at different stages, calculate in real time the optimal pouring flow rates of the grouting machines in different areas, and feedback the optimal pouring flow rate information to the grouting machines in real time. Through the automatic control system, adjust the pouring speed of the grouting machines in real time to ensure that the height deviation of pouring in each area is within a scientifically controllable range, avoid the "wall hanging" phenomenon of ultra-high performance concrete, and thus effectively guarantee the construction quality of ultra-high performance concrete reinforcement and repair until the reinforcement and repair construction is completed.

[0019] Among them, the PLC (programmable logic controller), as the core real-time operation and execution unit, its control process can be roughly divided into four links: "data acquisition - algorithm operation - execution control - feedback correction". In this solution, it is specifically shown as follows: (1) The PLC, through the data acquisition module, collects in real time key parameters such as the coordinates of the horizontal pouring end point and the pouring time located and wirelessly transmitted by the humidity sensor, while the average thickness of roughening and the initial pouring flow rate of the 2# grouting machine are manually input into this data acquisition module; (2) Calculate the pouring heights in each area through the built-in calculation formula, and further calculate the optimal pouring flow rates of the grouting machines in different areas; (3) Convert the calculated optimal pouring flow rates of the grouting machines in each area into voltage or current signals, and control the proportional valves or variable frequency drives (VFDs) of the grouting machines through the analog output module (AO) to adjust the rotational speed of the pumps or the opening degrees of the valves (i.e., adjust the pouring speeds of the grouting machines), so that the grouting machines perform grouting operations at the specified flow rates, ensure that the height deviation of pouring in each area is within a scientifically controllable range, and further guarantee the quality of reinforcement and repair.

[0020] The above examples are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples. The above-described examples only represent several embodiments of the present invention, and their descriptions are relatively specific and detailed, but they cannot be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent of the present invention shall be subject to the appended claims.

Claims

1. A method for compact reinforcement and repair of ultra-high performance concrete with low environmental impact, characterized in that, It includes the following steps: Step S1: Rough the surface of the existing building structure to be strengthened and repaired, divide the roughened surface into several regions from left to right according to the total horizontal length, and record the average thickness, horizontal length and total height of the roughened surface of each region; Step S2: Clean the roughened surface until the surface reaches a state of being wet and without obvious accumulated water; Step S3: Fix a steel formwork on the roughened surface, and the size of the steel formwork matches the roughened surface; Step S4: Prepare C120 grade steel fiber / high performance hybrid fiber concrete or C100 grade non-metallic fiber high performance concrete; Step S5: Provide three grouting machines, place the high performance concrete prepared in Step S4 into the grouting machines respectively, start the grouting machines to start continuous pouring construction, record the pouring time, grouting flow rate and cross-sectional area. The initial cross-sectional shape of the pouring is triangular, and then the cross-sectional shape evolves into a pentagon until the pouring construction is completed and the cross-sectional shape becomes rectangular; Step S6: During the pouring process, for the central region, calculate the real-time pouring height of this region according to parameters such as the pouring volume identity and the initial pouring flow rate. For each of the other two side regions, obtain the pouring height control value by taking random numbers. Further, according to the height-flow collaborative control pouring construction quality control equation derived based on the pouring volume identity, calculate the pouring flow rate control values for each of the other two side regions; Step S7: Provide a PLC controller, collect basic parameters such as the horizontal pouring end point coordinates, average roughening thickness, and pouring time in real time, combine with the built-in pouring construction quality control equations based on height-flow collaborative control in different stages, calculate the optimal pouring flow rate of the grouting machines in different regions in real time, and feedback the optimal pouring flow rate information to the grouting machines in real time. Through the automatic control system, adjust the pouring speed of the grouting machines in real time to ensure that the pouring height deviation in each region is within a scientifically controllable range, avoid the phenomenon of high performance concrete sticking to the wall, and effectively guarantee the construction quality of high performance concrete strengthening and repair until the end of the strengthening and repair construction.

2. The method according to claim 1, wherein The roughened surface is divided into three regions from left to right according to the total horizontal length, and are denoted as 1 # , 2 # , 3 # . The average thickness of roughening in each region is denoted as d1, d2, d3, the horizontal length of each region is denoted as L1, L2, L3, and the total height of the roughened surface is denoted as H; the pouring time in the step S5 is denoted as T, the grouting flow rates are denoted as Q1, Q2, Q3 respectively, and the cross-sectional areas of ultra-high performance concrete pouring are denoted as S1, S2, S3, and the initial shape is triangular. When L i = L1, L2 or L3, the triangle reaches the maximum. After that, the cross-sectional shape evolves into a pentagon until the pouring construction is completed and the cross-sectional shape becomes a rectangle. The pouring volume formula is V = S×d = Q×T; in the triangular stage, the total pouring height is denoted as H1 = h 1,i , H2 = h 2,i , H3 = h 3,i . At this time: For 2 # For the area, according to the pouring volume formula, we get: V2 = 0.5×(L 2,b -L 2,a )×h 2,i ×d2 = Q2×T, then h 2,i = Q2×T / [0.5×(L 2,b -L 2,a )×d2]; For 1 # and 3 # regions, take h 1,i or h 3,i = rand(0.95×h 2,i , 1.05×h 2,i ), to ensure that the pouring heights of the three regions are consistent. According to the derivation of the pouring volume formula, the pouring construction quality control equation based on height - flow collaborative control is obtained: Q1 = 0.5×(L 1,b - L 1,a )×h 1,i ×d1 / T, Q3 = 0.5×(L 3,b - L 3,a )×h 3,i ×d3 / T; When the triangle reaches its maximum, the pouring height is denoted as h 1,imax 、h 2,imax 、h 3,imax ; In the pentagon stage, the casting section is divided into two parts: the largest triangle at the top and the lower rectangle. Here, the height of the lower rectangle is denoted as h 1,k 、h 2,k 、h 3,k ,The total casting height is denoted as H1 = h 1,imax +h 1,k 、H2 = h 2,imax +h 2,k 、H3 = h 3,imax +h 3,k At this time: For 2 # For the area, according to the pouring volume formula, we get: V2=(0.5×L2×h 2,imax +L2×h 2,k )×d2=Q2×T, then h 2,k =Q2×T / (L2×d2)-0.5×h 2,imax , H2=h 2,imax +h 2,k =Q2×T / (L2×d2)+0.5×h 2,imax ; For 1 # and 3 # regions, take H1 or H3 = rand(0.95×H2, 1.05×H2) to ensure that the pouring heights of the three regions are consistent. Based on the pouring volume formula, the pouring construction quality control equation based on height-flow collaborative control is derived as follows: Q1 = (H1 - 0.5×h 1,imax ) × L1 × d1 / T, Q3 = (H3 - 0.5×h 3,imax ) × L3 × d3 / T, where d is the average chiseled thickness.

3. The method according to claim 1, characterized in that, The said Step S3 includes: At the exact middle position of the bottom of each area of the steel formwork, there is a grouting hole. Several humidity sensors are provided at the bottom of the steel formwork to identify the coordinates of the left and right pouring endpoints of the ultra-high performance concrete grouting material in the horizontal direction in real time, denoted as L a 、L b , then the horizontal pouring distance of each area is L 1,i =L 1,b -L 1,a 、L 2,i =L 2,b -L 2,a 、L 3,i =L 3,b -L 3,a 。 4. The method according to claim 2, wherein The inner surface of the steel formwork is flat, smooth and free of impurities.

5. The method according to claim 3, wherein Through Step S7, a high performance concrete strengthening and repair layer is formed, and the high performance concrete strengthening and repair layer is located outside the matrix structure.

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