Management method for preventing cracking of plateau alpine high-speed railway bridge pier column

Abstract

The invention relates to the technical field of civil engineering management and construction, in particular to a management method for preventing cracking of a plateau alpine high-speed railway bridge pier stud, which comprises the following steps: an intelligent monitoring step: monitoring the internal temperature of concrete in real time through a pre-embedded fiber bragg grating sensor, and collecting environmental temperature and humidity data in combination with a wireless temperature and humidity sensor; data is received and analyzed in real time through a mobile phone APP, a penetrating management step: a three-level penetrating management architecture of headquarters, work areas and work groups is established, and an energy-saving maintenance step: constant-humidity maintenance is performed on the pier column by adopting an automatic spraying system powered by solar energy and combining plastic film coverage. According to the method, temperature and humidity data are collected in real time through intelligent monitoring, a penetrating type three-level management framework is constructed to achieve rapid instruction response, energy consumption is reduced through a solar maintenance system, the crack occurrence rate is remarkably reduced, the construction period is shortened, and the environmental protection requirement of the plateau ecologically fragile area is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of civil engineering management and construction technology, in particular to a management method for preventing cracking of highland alpine high-speed railway bridge piers. BACKGROUND

[0002] The pier of the high-speed railway bridge in the highland alpine region is prone to cracking due to the harsh environment, which is specifically manifested in:

[0003] Environmental factors: large diurnal temperature difference (daily temperature difference ≥ 25℃), frequent freeze-thaw cycles (annual freeze-thaw frequency ≥ 100 times), resulting in a sharp increase in concrete stress; extensive management: traditional construction relies on manual experience, data collection is lagging, and it is impossible to monitor temperature and humidity changes in real time and to warn of cracking risks; resource waste: high energy consumption for maintenance, large carbon emissions for material transportation, and outstanding environmental protection pressure; the existing technology lacks a systematic management solution, making it difficult to achieve the goal of "prevention first and precise control".

[0004] Therefore, there is an urgent need for a comprehensive management method that integrates intelligent monitoring, penetrating management and energy-saving maintenance to solve the cracking problem of bridge piers in the highland alpine region. SUMMARY

[0005] The problem to be solved by the present application is to provide a management method for preventing cracking of highland alpine high-speed railway bridge piers, which combines intelligent monitoring, penetrating management and energy-saving maintenance technology to solve the problem of pier cracking caused by harsh environment, extensive management and resource waste.

[0006] In view of the deficiencies of the prior art, the technical scheme adopted by the present application to solve its technical problems is: a management method for preventing cracking of highland alpine high-speed railway bridge piers, comprising the following steps:

[0007] Intelligent monitoring step: real-time monitoring of concrete internal temperature by pre-embedded fiber Bragg grating sensor, combined with wireless temperature and humidity sensor to collect environmental temperature and humidity data; and real-time receiving and analyzing data through a mobile phone APP, the mobile phone APP sets a temperature difference threshold, when the temperature difference between the core temperature of the concrete and the surface temperature of the concrete is ≥ 25℃ or the temperature difference between the surface temperature of the concrete and the environmental temperature is ≥ 20℃, an early warning is triggered and pushed to the management platform;

[0008] Penetrating management step: establishing a three-level penetrating management framework of command department, work area and operation team; the command department issues global parameters through the WeChat platform, the global parameters including maintenance period, temperature recording requirements and emergency plan; the work area dynamically adjusts the maintenance scheme combined with local climate data and feeds back the execution data to the command department; the operation team detects the pier temperature four times a day, and uploads the detection data through Dingding software and watermark camera software to form an execution closed loop;

[0009] Energy-saving maintenance steps: adopt the automatic spraying system powered by solar energy, combine with the plastic film covering to carry out constant humidity maintenance on the pier column, the spraying water is moisturized through the plastic film, the concrete surface humidity is maintained at ≥ 90% for 14 days, and the spraying is automatically started when the humidity is insufficient.

[0010] Preferably, the laying density of the embedded optical fiber grating sensor is 6-10 per pier column, and the emergency measures of starting the covering insulation film or adjusting the spraying frequency are started within 30 minutes after the early warning trigger of the mobile phone APP.

[0011] Preferably, the detection time points of the work team are 2 o'clock in the morning, 8 o'clock in the morning, 14 o'clock in the afternoon and 20 o'clock in the evening, the detection data includes environmental temperature, concrete temperature and film covering state, and the detection data is uploaded to the management group after being added with engineering name, pier column number and time information through Dingding software timed clock-in and watermark camera software.

[0012] Preferably, the automatic spraying system powered by solar energy comprises a temperature and humidity threshold control module, which automatically starts spraying when the concrete surface humidity is insufficient, and the maintenance lasts until the compressive strength of the same condition test piece reaches 75% of the design strength.

[0013] Preferably, the plastic film covering form is a rotating tight hoop from top to bottom of the pier body, so that the spraying water can smoothly flow and penetrate to the lowermost part of the pier body. The spraying water is moisturized through the plastic film, the temperature and humidity are automatically adjusted and sprayed, and the water saving rate is ≥ 30%.

[0014] Preferably, the mobile phone APP is linked with the management platform, real-time dynamic construction parameters are generated, and the real-time dynamic construction parameters are directly pushed to the work terminal through a three-level management architecture.

[0015] The beneficial effects of the present application are as follows:

[0016] 1. Crack control: the crack occurrence rate is reduced from ≥ 0.3 pieces / ㎡ in the traditional method to ≤ 0.05 pieces / ㎡, reduced by 83%;

[0017] 2. Energy-saving benefit: the maintenance energy consumption is reduced from 15-20 kW·h / m 3 to 8-10 kW·h / m 3 , reduced by 50%;

[0018] 3. Construction efficiency: the construction period is shortened by 20% (from 35-40 days to 28-30 days);

[0019] 4. Environmental protection compliance: the modular design is suitable for different project scales, the cost of a single system is reduced by 35%, the carbon emission meets the first level standard of "Green Construction Guide", and is suitable for popularization in plateau ecological fragile areas. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1It is the intelligent monitoring system architecture of the application;

[0021] Figure 2 It is the penetrating management flow chart of the application;

[0022] Figure 3 It is the solar maintenance device installation flow chart of the application;

[0023] Figure 4 It is the solar photovoltaic panel layout (sectional view) of the application;

[0024] Figure 5 It is the solar photovoltaic panel layout (front view) of the application;

[0025] Figure 6 It is the solar photovoltaic panel water tank plan of the application;

[0026] Figure 7 It is the solar photovoltaic panel installation schematic of the application.

[0027] The figure mark explanation: 1, sling; 2, annular water tank; 3, photovoltaic panel truss; 4, steel pipe; 5, small hole; 6, solar photovoltaic panel; 7, temperature and humidity controller; 8, water pump; 9, steel bar; 10, Φ8 steel bar pin; 11, plastic film. DETAILED DESCRIPTION

[0028] The application will be described in further detail below with reference to the drawings and specific embodiments. The embodiments of the application are given for illustrative and descriptive purposes only and are not exhaustive or limiting of the application as disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the application and its practical application and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

[0029] As shown in Figures 1-7 The application provides a management method for preventing cracking of highland alpine high-speed railway bridge piers, comprising the following steps:

[0030] Intelligent monitoring step: the internal temperature of the concrete is monitored in real time through the pre-buried fiber grating sensor, the environmental temperature and humidity data are collected in combination with the wireless temperature and humidity sensor, and the data are received and analyzed in real time through the mobile phone APP. The temperature difference threshold is set in the mobile phone APP. When the temperature difference between the core temperature of the concrete and the surface temperature of the concrete is greater than or equal to 25 DEG C or the temperature difference between the surface temperature of the concrete and the environmental temperature is greater than or equal to 20 DEG C, a warning is triggered and pushed to the management platform.

[0031] The laying density of the embedded optical fiber grating sensor is 6-10 per pier column, the mobile phone APP monitors the temperature difference in real time, and the emergency response measures are started within 30 minutes after the early warning trigger. The emergency response measures include covering the thermal insulation film or adjusting the spraying frequency.

[0032] Penetrating management steps: Establish a three-level penetrating management framework of command department, work area and operation team, take the command department as the core, the deputy commander and the chief engineer as the first responsible person, establish a "pier body maintenance monitoring" group, the command department issues global parameters through the WeChat platform, including maintenance period, temperature recording requirements and emergency plan; the work area dynamically adjusts the maintenance scheme combined with local climate data, and feeds back the execution data to the command department; the operation team detects data four times a day, the detection time points are 2 am, 8 am, 14 pm and 20 pm, the detection data includes environmental temperature, concrete temperature and film covering state, and uploads data to the management group through Dingding software (positioning verification) and watermark camera software (additional engineering name, pier column number, time), ensuring that the execution deviation rate is less than or equal to 2%.

[0033] The work area on-site monitoring personnel go to the pier body maintenance place every day for 4 time periods, scan the code (pier body paste two-dimensional code) to determine the pier body related information (such as strength grade, pouring date, maintenance period, maintenance condition, etc.), then use Dingding software to punch the card (the main purpose is that the system can query the specific punch card position and punch card time, and there is position positioning), and watermark camera software to edit related information (such as: engineering name, pier column number, environmental temperature, maintenance period, concrete temperature, covering condition, etc. Watermark camera software displays environmental temperature function), and sends related photos to the common work group (WeChat or QQ), so that relevant leaders can master the pier body maintenance monitoring information in the first time, and the data clerk will register the account according to the photo uploading time and content, and make a good record, so as to hold responsible for the concrete cracks caused by the unmonitored temperature due to human laziness and inaction in the later period.

[0034] The pier body maintenance monitoring group leaders and members regularly check the maintenance situation on site, find out the problems, check the Dingding software punch card and watermark camera software in the first time, and rectify and hold responsible for the pier columns and personnel who do not complete the examination.

[0035] After 14d of pier body maintenance, the on-site same condition maintenance test piece is subjected to compressive strength test to determine whether it meets the design strength of 75%, if it meets the requirement, the temperature monitoring can be stopped.

[0036] The mobile phone APP and the management platform are linked, real-time dynamic construction parameters are generated, and are directly pushed to the operation terminal through the three-level management framework.

[0037] Energy-saving maintenance steps: adopt solar power automatic sprinkler system, solar power automatic sprinkler system includes temperature and humidity threshold control module, combined with plastic film covering to maintain the pier column, the plastic film covering form rotates around the pier body from top to bottom, so that the spray water can flow smoothly and penetrate to the lower part of the pier body, the spray water is preserved by the plastic film, the temperature and humidity are automatically adjusted, the water saving rate is ≥30%, the concrete surface humidity is maintained ≥90% for 14 days, and the spray is automatically started when the humidity is insufficient, and the maintenance continues until the compressive strength of the test piece under the same conditions reaches 75% of the design strength.

[0038] The principle is that solar energy absorbs electric energy, a temperature and humidity sensor is arranged at the top of the pier column (a device used in a standard concrete curing room), (such as temperature setting 10℃, humidity setting 50%, if the index is not reached, automatic spraying starts to spray water, the pier body is covered with rotating plastic film, the sprayed water directly flows into the plastic film, forming constant moisture preservation, 7-14d curing age, the concrete reaches 75% of the design strength, and the maintenance can be stopped. At this stage, the concrete surface is fully moistened with water, and the saturated water on the surface can resist the erosion of external ultraviolet rays and sand, and no curing cracks occur. The spraying system can be reused, and the maintenance period meets the requirements.

[0039] Solar sprinkler system installation:

[0040] Photovoltaic panel assembly:

[0041] Step 1: Assemble the solar photovoltaic panel 6 on five sides, of which the top side can adjust the angle, and one side of the side can be lifted to facilitate personnel to enter and install and fix.

[0042] Step 2: According to the diameter of the pier column, the solar photovoltaic panel 6 "barrel" can be buckled on the pier column, the barrel-shaped photovoltaic panel (the diameter is 1-2cm smaller than the pier column, which can be on the top of the pier column concrete) and the pre-embedded steel bar of the pier column and the photovoltaic "barrel" form an integral whole, and the outer side of the "photovoltaic barrel" is designed with a ring-shaped water tank 2, which is evenly counterweighted.

[0043] Step 3: Connect the power supply, turn on the temperature and humidity controller 7, and automatically spray.

[0044] Note: (1) According to the height of the outer leakage steel bar 9 of the pier body, the steel pipe 4 welded in the photovoltaic panel "barrel" can be sleeved on the steel bar 9, and 6-8 steel pipes 4 are designed, a small hole 5 is opened on the side of the steel pipe 4, a Φ8 steel pin 10 is inserted into the small hole 5, and is clamped at the ribbed steel bar 9.

[0045] (2) The single-sided folding plate can be opened, the worker can enter the inside for installation, and the power supply can be turned on.

[0046] (3) The ring-shaped water tank 2 is provided with a water pump 8 for convenient water pumping, the water tank for spraying work is filled with about 200-300kg of water, and the plastic film 11 is wetted to save water.

[0047] The lifting appliance 1 is welded on the photovoltaic panel truss 3, and the inductor (spraying system) is placed inside.

[0048] The plastic film 11 is wrapped on the side of the pier column, and water slowly penetrates the inside to keep the heat for a long time, and water is saved.

[0049] Example and effect verification

[0050] Taking a super-large bridge of Xi-Cheng railway as an example:

[0051] Intelligent monitoring: 6-10 sensors are arranged on a single pier column, and the mobile phone APP triggers 3 times of temperature early warning and automatically starts the spraying heat preservation measure.

[0052] Penetration management: the instruction is directly sent to the terminal through a three-level architecture, the execution deviation rate is less than or equal to 2%, the maintenance data is uploaded in real time, and the responsibility tracing efficiency is improved by 50%.

[0053] Energy-saving effect: the solar energy system saves 1800kW·h of electricity, the spraying water saving utilization rate is greater than or equal to 30%, the maintenance period is 14 days, the pier column has no visible cracks, and the freeze-thaw cycle test is qualified for more than 300 times.

[0054] Implementation effect comparison

[0055]

[0056]

[0057] Core innovation points:

[0058] 1. Intelligent and penetration fusion: through the combination of Internet of Things (mobile phone APP) data and penetration management, the "monitoring-decision-execution" closed loop is realized;

[0059] 2. Energy-saving and popularization: the modular design is suitable for different project scales, and the cost of a single system is reduced by 35%;

[0060] 3. Environmental protection compliance: the carbon emission index meets the first level standard of "Green Construction Guide", and is suitable for popularization in the fragile ecological region of plateau.

[0061] The present application realizes rapid response of instruction by real-time collection of temperature and humidity data through intelligent monitoring, construction of penetration type three-level management architecture, and adoption of solar maintenance system to reduce energy consumption, so that the crack occurrence rate is significantly reduced, the construction period is shortened, and the environmental protection requirements in the fragile ecological region of plateau are met.

[0062] In the plateau and cold region, the pier body cannot be constructed during the winter construction period, so the winter maintenance cannot be reflected, and the above is a maintenance management method during the non-winter construction period.

Claims

1. A management method for preventing cracking of bridge piers in high-speed railways in high-altitude and cold regions, characterized in that: Includes the following steps: Intelligent monitoring steps: The internal temperature of the concrete is monitored in real time by a pre-embedded fiber optic grating sensor, and the ambient temperature and humidity data are collected by a wireless temperature and humidity sensor. The data is received and analyzed in real time through a mobile APP. The mobile APP sets a temperature difference threshold. When the temperature difference between the core of the concrete and the surface of the concrete is ≥25℃ or the temperature difference between the surface of the concrete and the ambient temperature is ≥20℃, an early warning is triggered and pushed to the management platform. Penetration-based management steps: Establish a three-tiered penetration-based management structure consisting of the command center, work area, and work team; The command center distributes global parameters via WeChat, including maintenance cycles, temperature recording requirements, and emergency plans. The work area dynamically adjusts the maintenance plan based on local climate data and feeds back the execution data to the command center. The work team checks the pier temperature four times a day and uploads the data through DingTalk software and watermark camera software, forming a closed-loop execution process. Energy-saving maintenance steps: An automatic sprinkler system powered by solar energy is used in conjunction with plastic film covering to maintain constant humidity on the piers. The sprinkler water is moisturized through the plastic film, maintaining the surface humidity of the concrete at ≥90% for 14 days, and automatically starting the sprinkler when the humidity is insufficient.

2. The management method for preventing cracking of bridge piers in high-speed railways in cold and high-altitude areas according to claim 1, characterized in that: The pre-embedded fiber optic grating sensors are deployed at a density of 6-10 per pier, and emergency measures such as covering with insulation film or adjusting the spray frequency are initiated within 30 minutes after the mobile APP triggers an early warning.

3. The management method for preventing cracking of bridge piers in high-speed railways in cold and high-altitude areas according to claim 1, characterized in that: The work team's inspection times are 2:00 AM, 8:00 AM, 2:00 PM, and 8:00 PM. The inspection data includes ambient temperature, concrete temperature, and membrane covering status. The data is uploaded to the management group after being checked in regularly via DingTalk software and with the project name, pier number, and time information attached using watermark camera software.

4. The management method for preventing cracking of bridge piers in high-speed railways in cold and high-altitude areas according to claim 1, characterized in that: The solar-powered automatic spraying system includes a temperature and humidity threshold control module. When the humidity on the concrete surface is insufficient, the spraying is automatically started, and the curing continues until the compressive strength of the specimen under the same conditions reaches 75% of the design strength.

5. The management method for preventing cracking of bridge piers in high-speed railways in cold and high-altitude areas according to claim 1, characterized in that: The plastic film covering is arranged in a rotating, tight-fitting manner from top to bottom around the pier body, allowing the spray water to flow smoothly and penetrate to the bottom of the pier body. The spray water is retained by the plastic film, and the temperature and humidity are automatically adjusted for spraying, resulting in a water saving rate of ≥30%.

6. The management method for preventing cracking of bridge piers in high-speed railways in cold and high-altitude areas according to claim 1, characterized in that: The mobile app works in conjunction with the management platform to generate dynamic construction parameters in real time, and pushes them directly to the work terminals through a three-tier management architecture.

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