CN115749333B - Rapid electric excitation maintenance construction method for ultra-long concrete structure - Google Patents
Rapid electric excitation maintenance construction method for ultra-long concrete structure Download PDFInfo
- Publication number
- CN115749333B CN115749333B CN202211670290.1A CN202211670290A CN115749333B CN 115749333 B CN115749333 B CN 115749333B CN 202211670290 A CN202211670290 A CN 202211670290A CN 115749333 B CN115749333 B CN 115749333B
- Authority
- CN
- China
- Prior art keywords
- curing
- concrete structure
- temperature
- electric excitation
- ultra
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005284 excitation Effects 0.000 title claims abstract description 95
- 238000010276 construction Methods 0.000 title claims abstract description 59
- 238000012423 maintenance Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 85
- 230000008569 process Effects 0.000 claims abstract description 53
- 238000013316 zoning Methods 0.000 claims abstract description 9
- 238000001723 curing Methods 0.000 claims description 151
- 238000012360 testing method Methods 0.000 claims description 15
- 230000036571 hydration Effects 0.000 claims description 8
- 238000006703 hydration reaction Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 5
- 206010014357 Electric shock Diseases 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 230000020169 heat generation Effects 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000008642 heat stress Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
A rapid electric excitation maintenance construction method for an ultra-long concrete structure belongs to the technical field of civil engineering. In order to solve the problem of long construction period in the maintenance of an ultra-long concrete structure. According to the geometrical parameters of the ultra-long concrete structure, the invention carries out modularized zoning treatment on the ultra-long concrete structure; a plurality of temperature sensors are arranged in the concrete structure mould corresponding to each area, and a detachable template is arranged between every two areas; a telescopic net-shaped electrode plate is arranged inside and outside the concrete structure mould corresponding to each area, and/or a detachable electrode plate is arranged inside the template; then pouring fresh concrete, and performing intelligent electric excitation curing on the poured fresh concrete; in the intelligent electric excitation maintenance process, the electrified voltage is adjusted according to the designed electrified power, and the electrified power in a step form is adjusted in the adjustment process.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to an intelligent electric excitation maintenance construction method of an ultra-long concrete structure.
Background
The concrete structure with the length of more than 30m can be generally considered as an ultra-long concrete structure, and the construction and construction of the ultra-long concrete structure mainly depend on a post-pouring strip method and a bin-skip method at present, wherein the post-pouring strip method is widely applied as a traditional large-scale concrete structure construction method, and the time for applying the bin-skip method in engineering is relatively short. Specifically, the post-cast strip is a temporary construction joint in nature, is an improvement means provided for the phenomenon that the permanent expansion joint possibly causes structural water seepage, has high quality requirements on cleaning work in the construction process by a post-cast strip method, is unstable in construction quality, and can cause the phenomenon of water seepage once the post-cast strip cracks. Before the post-cast strip is filled, the structure may face the long-term water leakage condition, and the construction progress is seriously affected. And the post-pouring strip method has a longer construction period, often reaching 2 months or even longer, and greatly increasing the labor and time cost. The method is essentially an interval construction method, and the principle of 'pre-release and post-resistance' is utilized to avoid cracks of a large-scale concrete structure. However, the principle of the bin-jump method shows that the method is a conventional concrete structure maintenance method, has higher requirements on concrete raw materials, shortens a certain construction period compared with a post-pouring strip method, but has the characteristic that the bin-jump method requires that adjacent bin concrete can be poured at least 7 days apart, greatly prolongs the construction period and increases various costs in the construction process.
Disclosure of Invention
The invention aims to solve the problem of long construction period in maintenance of an ultra-long concrete structure.
A rapid electric excitation maintenance construction method of an ultra-long concrete structure comprises the following steps:
According to the geometrical parameters of the ultra-long concrete structure, carrying out modularized zoning treatment on the ultra-long concrete structure; a plurality of temperature sensors are arranged in the concrete structure mould corresponding to each area, and a detachable template is arranged between every two areas;
a telescopic net-shaped electrode plate is arranged inside and outside the concrete structure mould corresponding to each area, and/or a detachable electrode plate is arranged inside the template;
then pouring fresh concrete, and performing intelligent electric excitation curing on the poured fresh concrete; in the intelligent electric excitation maintenance process, the electrifying voltage is adjusted according to the designed electrifying power, and the electrifying power is adjusted in a step-shaped electrifying power change mode in the adjustment process; the energizing power is designed according to the relation between the electric power and the curing temperature shown in the following formula:
In the method, in the process of the invention, And/>Representing the power of the electricity and the power of hydration heat respectively,/>Representing the area of a radiating surface of the electric excitation curing concrete structure member,/>And/>Respectively the heat conductivity coefficient and the radiation heat dissipation coefficient of the electric excitation curing concrete structureRepresenting the temperature difference between the test piece and the environment,/>Represents the temperature of the test piece during curing-Representing ambient temperature.
Further, in the process of electric excitation curing, in the environment that the daily average air temperature is more than 20 ℃ or the daily maximum air temperature is more than 30 ℃, an interval area electric excitation curing method is adopted for electric excitation curing, namely in the process of electrifying, the concrete structure of a certain area and the concrete structure of an adjacent area cannot be electrified at the same time, and the concrete structure of the area separated from the certain area is electrified; in other environments, a full-area electric excitation curing method is adopted, namely, the whole concrete structure is subjected to electric excitation curing after pouring is finished.
Further, when the adjustment is performed by the step-type power variation method, the adjustment is performed by taking 50W as a step and the duration time as 20min.
Further, the temperature difference standard and the temperature standard are required to be met in the electric shock curing process, namely:
The temperature difference between the temperature of the concrete structure and the ambient temperature is not more than 65 ℃ under the positive temperature condition, and the actual temperature of the structure is not more than 85 ℃;
The temperature difference between the temperature of the concrete structure and the ambient temperature is not more than 90 ℃ under the negative temperature condition, and the actual temperature of the structure is not more than 60 ℃.
Further, when the temperature difference standard is not met in the electric excitation maintenance process and the duration reaches 5min, the power needs to be adjusted, the 70W step is used, and the duration is adjusted for 10 min.
Further, the regional curing period in the electric excitation curing process is determined by a maturity theoretical formula;
The theoretical formula of maturity is as follows:
In the method, in the process of the invention, Representing the maturity of the concrete structure, unit/>；/>Represents the curing temperature at the ith hour; /(I)Represents the concrete reference temperature; /(I)Represents the curing time in h.
Further, the process of the interval region electro-excitation curing method is as follows:
Firstly, carrying out electric excitation curing on the interval region, carrying out electric excitation curing on the rest interval region after the temperature of the concrete of the interval region is reduced to a preset temperature after the electric excitation curing, and dismantling the template after the temperature of the concrete of the interval region is reduced to the preset temperature after the electric excitation curing;
and then pouring fresh concrete into the template gaps among all the areas according to the mode of spacing the template gaps for electric excitation curing, namely pouring fresh concrete into the template gaps at intervals and carrying out electric excitation curing, and then pouring fresh concrete into the rest template gaps and carrying out electric excitation curing.
Further, the whole area electro-excitation curing method comprises the following steps:
Firstly, carrying out electric excitation curing on all areas, and detaching the template after the concrete temperature of all areas is reduced to a preset temperature after the electric excitation curing;
and then pouring fresh concrete into the template gaps among all the areas according to the mode of spacing the template gaps for electric excitation curing, namely pouring fresh concrete into the template gaps at intervals and carrying out electric excitation curing, and then pouring fresh concrete into the rest template gaps and carrying out electric excitation curing.
Further, when the modular zoning treatment is carried out on the ultra-long concrete structure, zoning treatment operation is carried out along the long side direction of the ultra-long concrete structure, and the length of each zone is not less than 2m and not more than 1/10 of the length of the ultra-long concrete structure in the long side direction.
Further, when fresh concrete is poured, the pouring sequence is to perform pouring from the middle to the two ends of all the areas.
The beneficial effects are that:
1. The intelligent construction method is used for realizing intelligent electric excitation curing construction of the ultra-long concrete structure, compared with the traditional method, the intelligent construction method can remarkably shorten the curing period, reduce the construction time and the labor cost, realize high strength of the cured concrete structure in a short period and realize the high-quality curing process of the concrete structure.
2. The intelligent electric excitation maintenance method is also suitable for construction and construction of the ultra-long concrete structure in a negative temperature environment. The construction period is shortened, meanwhile, the construction of important infrastructure in winter in the cold region is facilitated, and the construction method has the beneficial effects of promoting economic construction of provinces in the cold region.
3. The invention can realize the intelligent construction of the field construction of the electric excitation curing concrete structure in each scene, no manual whole-process supervision is needed in the curing process, the curing mode has the characteristics of safety, energy conservation and high efficiency, and the curing temperature of the concrete test piece is in a constant and higher range in the whole curing process, so that the high-quality curing of the ultra-long concrete structure can be realized.
4. The curing equipment can realize temperature control curing of the ultra-long concrete structure in the curing process, and can automatically change the output voltage according to the resistance change of the concrete structure in each area obtained by feedback of the intelligent control system, thereby strictly preventing the dangerous situation of fire disaster caused by the rapid increase of the curing temperature in the template.
Drawings
Fig. 1 is a schematic diagram illustrating region division in an embodiment.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention is described below by means of specific embodiments shown in the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
It should be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and/or processing steps closely related to aspects of the present invention are shown in the drawings, and other details not greatly related to the present invention are omitted.
Aiming at the problems in the background art, if the construction of the ultra-long concrete structure is essentially improved from a curing system to be a difficult problem in the construction of the concrete structure, the electric excitation curing is a method capable of curing the concrete structure on site, and the method has simple operation principle, but can realize the rapid on-site pouring of the concrete structure under the conditions of positive temperature and negative temperature. Considering the characteristic of the method, the application of the method to the construction of the ultra-long concrete structure can bring about the transformation of the construction field of the ultra-long concrete structure, but the key problems to be solved are many. In order to solve the problems, the invention provides a rapid electric excitation maintenance construction method of an ultra-long concrete structure.
The invention relates to a rapid electric excitation maintenance construction method of an ultra-long concrete structure, which comprises the following steps:
S1, combining construction drawings, determining geometrical parameters of an ultra-long concrete structure, and carrying out modularized zoning treatment on the ultra-long concrete structure; for all the areas, marking alternately from the center of the area to the two ends in turn; providing a plurality of temperature sensors in each zone; when the modularized zoning treatment is carried out on the ultra-long concrete structure, zoning treatment operation is carried out along the long side direction of the ultra-long concrete structure, and the length of each zone is not less than 2m and not more than 1/10 of the length of the long side direction of the ultra-long concrete structure;
Combining the regional treatment results, arranging a detachable template between every two regions, and realizing regional operation of the actual concrete structure;
S2, arranging telescopic netlike electrode plates inside and outside the concrete structure mould corresponding to each area, and/or arranging detachable electrode plates inside the template;
In order to facilitate operation and save the number of electrode plates, the electrode plates can be arranged at two sides of the corresponding setting template of each region; or the detachable electrode plates are arranged in the template, so that the electrode plates are convenient to install, and the regions on two sides of the template can share one set of electrode plates to save the electrode plates;
s3, carrying out theoretical calculation on the power of the electric excitation maintenance structure by combining the size characteristics of the regional structure and the field actual environment, and programming the calculated power into an intelligent control system;
s4, pouring fresh concrete, wherein the pouring sequence is from the middle to two ends; performing intelligent electric excitation maintenance on the freshly mixed concrete after the completion of pouring; after the concrete adjacent area of a certain area is completely filled with fresh concrete, electrode plates at the left side and the right side of the area extend out of the die and are contacted with the concrete, the power is started through a high-precision voltage regulator capable of displaying electrical property parameters, and intelligent electric excitation maintenance is started.
And (3) carrying out electrifying operation on the concrete in the area at the electrifying initial stage by using an electrifying voltage of 10V so as to obtain the resistance value and the current value of the freshly mixed concrete, and feeding back the obtained electrical information to the intelligent control system.
In the intelligent electric excitation maintenance process, the electrified voltage is adjusted according to the designed electrified power, in the adjustment process, 50W is used as a step, and the duration is 20min, so that the phenomenon of heat stress concentration of the structure caused by too fast temperature rise is avoided as a core idea of the adjustment measure.
The heat generation condition of the intelligent electric excitation maintenance structure is as follows:
wherein Q is the heat generation amount of the electric excitation maintenance structure, And/>Respectively, the electrified heat generation and the hydration heat generation, t represents curing time, m represents a hydration rate coefficient, Q 0 represents the heat released by cement, and Wc represents the content of cement in the structure.
In the process of designing the power, the main sources of heat generation of the electric excitation curing concrete structure are electric heat generation and structural hydration heat generation, the heat release path is convection heat exchange and radiation heat release, and when the heat generation power and the heat release power reach balance, the curing temperature of the test piece is in a stable state. Based on this principle, a relationship between the electric power and the maintenance temperature shown by the following formula is derived, and the energization power is designed based on the relationship:
In the/> And/>Representing the power of the electricity and the power of hydration heat respectively,/>Representing the area of a radiating surface of the electric excitation curing concrete structure member,/>And/>Respectively the heat conductivity coefficient and the radiation heat dissipation coefficient of the electric excitation curing concrete structureRepresenting the temperature difference between the test piece and the environment,/>Represents the temperature of the test piece during curing-Representing ambient temperature.
The step-type power-on power change mode is that a plurality of power platforms are arranged in the curing process, the power platforms are arranged on the principle that the power platforms are increased firstly and then reduced, the curing temperature of the structure is guaranteed to be increased firstly and controlled in the intelligent electric excitation curing process, and the power platforms are slowly reduced after the curing temperature reaches preset strength.
In the curing process, the electric excitation curing under the environment that the daily average temperature is more than 20 ℃ or the daily maximum temperature is more than 30 ℃ adopts an interval area electric excitation curing method, namely in the electrifying process, the concrete structure of a certain area and the adjacent area cannot be in a state of being electrified at the same time, but the concrete structure of the area separated from the concrete structure starts the electrifying process, so that the heat stress concentration and the circuit safety problem possibly caused by the simultaneous electrifying are prevented; in other environments, a full-area electric excitation curing method can be adopted, namely, the whole concrete structure is subjected to electric excitation curing after pouring is finished.
Moreover, the influence of environmental factors on site construction of the ultra-long concrete structure can be avoided to the greatest extent by adopting different electric excitation curing methods aiming at different environmental temperatures, specifically, in a normal temperature environment, once the environmental temperature is too high, the temperature of electric excitation curing concrete is extremely easily influenced, the temperature of the concrete structure is increased to exceed a limit value, the influence is caused on a template, and once the whole-area electric excitation curing method is adopted, the template is possibly damaged due to the temperature increase, and the curing quality is influenced.
Considering the characteristic that the curing temperature of the concrete structure is not suitable to be too large in difference with the environment, the temperature difference between the temperature of the concrete structure and the environment temperature in the electro-shock curing process is not suitable to be more than 65 ℃ under the positive temperature condition, and the actual temperature of the structure is not suitable to be more than 85 ℃; the temperature difference between the temperature of the concrete structure and the ambient temperature in the electro-shock curing process is not more than 90 ℃ under the negative temperature condition, and the actual temperature of the structure is not more than 60 ℃.
And the temperature sensor feeds back the maintenance temperature of the test piece to the intelligent control system, when the maintenance temperature does not meet the temperature difference standard and the duration reaches 5min, the system controls and adjusts the power, and the maintenance temperature is adjusted by taking 70W as a step and the duration is 10 min.
Based on the concrete maturity theory, the interaction relation shown in the following formula exists among the test piece curing temperature, curing age and maturity of the concrete structure, and as shown in the formula, the higher the curing temperature of the concrete structure is, the shorter the curing age required for reaching the same maturity is.
In the/>Representing the maturity (DEG C.h) of the concrete structure,/>Represents the curing temperature at the ith hour,/>Representing the concrete reference temperature,/>Represents the curing time (h).
Compared with the conventional standard curing conditions, the curing time of the concrete structure can be obviously shortened by the electric excitation curing, and the standard curing level can be reached after the time of the electric excitation curing of the concrete structure is 2-3 days.
Aiming at the condition of curing by adopting an interval area electric excitation curing method, after reaching a preset curing age, the concrete in the electrified area stops electrifying, the concrete in the non-electrified area is in a non-adjacent state, at the moment, after the electric excitation curing of the concrete in each area is finished, the detachable templates are removed, the electrode plates are still arranged at the two ends of the concrete, the concrete with the same strength level is poured into the gaps of the templates, the electric excitation curing is carried out on the concrete structure in the gap by adopting the same interval electric excitation curing method, and after the completion, the electrode plates are taken out, so that the on-site rapid preparation of the concrete structure with the ultra-long structure is realized.
Compared with the traditional construction method of the ultra-long structure, the invention has the following characteristics: 1) The construction period is obviously shortened, the required period is at least 20 days due to long maintenance time and long interval time after maintenance, the intelligent electric excitation maintenance construction method can obviously shorten the construction period, the interval time is not needed to be considered when the maintenance time is obviously shortened, the concrete structure in one half area can be immediately subjected to electric excitation maintenance after the concrete structure in the other half area is subjected to electric excitation maintenance, and the maintenance time of the concrete at the template is obviously shortened compared with that of the gap concrete maintenance in the traditional method. Bringing huge time and economic cost advantages; 2) The maintenance method solves the problem of field construction of the ultra-long concrete, the existing maintenance method of the ultra-long concrete structure mainly adopts a post-cast strip method, but the construction period of the method is too long, the construction time often reaches 2 months, the post-cast strip which cannot be closed for a long time can cause the problem of water accumulation, and the post-cast strip once has sedimentation phenomenon. On the other hand, the method of the jump bin is also reported in the construction of a large-scale concrete structure by individual cases at present, but the construction period of the method of the jump bin is longer, and the construction process of the jump bin can utilize the concrete structure to generate larger shrinkage deformation, so that the surface of the structure needs to be treated for many times, and the construction requirement is higher. The intelligent curing control measure system provided by the invention takes various influences possibly brought by the curing temperature of concrete into consideration, and realizes the implementation monitoring and adjustment of the temperature of the whole curing process structure by using the intelligent control system. Ensuring that the structure does not generate cracks which affect the performance. 3) The maintenance method solves the problem of emergency ultra-long concrete construction in a negative temperature environment and plays a role in promoting the construction of important infrastructure in winter in severe cold areas of China.
Example 1:
the rapid electric excitation curing construction method of the ultra-long concrete structure is an intelligent electric excitation curing method of the ultra-long concrete structure under the normal temperature condition, and for the concrete structure with the length of 41m and the width of 5m, the ambient temperature is 30 ℃ at the normal temperature. The specific process of intelligent electric excitation maintenance is as follows:
1) Carrying out regional treatment on the concrete structure according to geometric parameters, wherein the length of each region is not less than 2m and not more than 1/10 of the length of the long side of the ultra-long concrete structure;
As shown in fig. 1, in this embodiment, the concrete structure is divided into seven areas 100, each area is 5.6m long, each area is connected by a detachable wood form 200, the width of the form is 0.3m, the central area of the seven areas is denoted as an area 1, the central area is alternately and sequentially marked with areas to two sides, the two sides of the area 1 are respectively denoted as one side and the other side, one side of the area 1 is denoted as an area 2, the other side is denoted as an area 3, the areas are alternately and continuously arranged in turn, one side is denoted as an area 4, the other side is denoted as an area 5, the areas are alternately arranged in turn, one side is denoted as an area 6, and the other side is denoted as an area 7; a telescopic conductive copper electrode plate is embedded in the template, and a relationship that the electrode plate can be detached from the template exists between the template and the electrode plate;
2) Pouring a concrete structure, namely pouring according to the pouring principle of the invention from the area 1 according to the sequence of areas, and taking the end of pouring of the areas 6 and 7 as a mark for the end of pouring of the structure;
3) Because the maintenance environment temperature is 30 ℃, an interval area electric excitation maintenance method is adopted, after pouring of areas 1, 4 and 5 is completed, the areas are immediately subjected to electric excitation maintenance, firstly 10V voltage is applied to the areas, the resistance values of the areas are obtained through an intelligent control system, the maintenance temperature is set to be 80 ℃, the required electric power is judged based on the following formula, the power applied to the concrete structure of the areas is adjusted by taking 50W as gradient, and each interval is 20min. And (3) in the maintenance process, the temperature development of the test piece is observed and fed back in real time.
4) Based on a maturity theoretical formula, the time required for the concrete structure to reach the 7-day strength under the standard curing condition is calculated to be 1.75 days, namely 42 hours, the engineering curing period is set to be 42 hours, and when the areas 1,4 and 5 are cured for 42 hours under the curing condition of 80 ℃, the test piece is subjected to power-off treatment.
In the/>Representing the maturity (DEG C.h) of the concrete structure,/>Represents the curing temperature at the ith hour,/>Representing the concrete reference temperature,/>Represents the curing time (h).
5) After the temperature of the areas 1, 4 and 5 is reduced to 30 ℃, carrying out intelligent electric shock curing on the areas 2, 3, 6 and 7, wherein the curing process is the same as that of the steps 3) and 4);
6) After the temperature of the areas 2, 3, 6 and 7 is reduced to 30 ℃, the detachable wood templates are removed, the electrode plates are kept, fresh concrete under the same conditions is poured into the template gaps among the areas 1 and 2, the areas 4 and 6 and the areas 3 and 5, and the concrete in the three template gaps is maintained through the electrode plates in the matrix, wherein the steps are the same as the steps 3) and 4);
7) When the temperature of the concrete in the template gaps between the areas 1 and 2, the areas 4 and 6 and the areas 3 and 5 is reduced to 40 ℃, the electrode plates are taken out, and curing of the concrete in the template areas is finished;
8) Pouring fresh concrete into the template gaps among the areas 2 and 4, the areas 1 and 3 and the areas 5 and 7, and curing the concrete in the three areas through electrode plates in a matrix, wherein the steps are the same as 3) and 4); when the temperature of the concrete in the template gaps between the areas 2 and 4, the areas 1 and 3 and the areas 5 and 7 is reduced to 40 ℃, the electrode plates are taken out, and the curing of the concrete in the template areas is finished;
9) At the moment, the intelligent electric excitation curing process of the concrete with the ultra-long structure is finished, and the total construction period is 7 days.
Example 2:
The rapid electric excitation curing construction method of the ultra-long concrete structure is an intelligent electric excitation curing method of the ultra-long concrete structure under the negative temperature condition, and for the concrete structure with the length of 41m and the width of 5m, the ambient temperature is minus 15 ℃. The specific process of intelligent electric excitation maintenance is as follows:
1) Carrying out regional treatment on the concrete structure according to the geometric parameters;
As shown in fig. 1, in this embodiment, the concrete structure is divided into seven areas 100, each area is 5.6m long, each area is connected by a detachable wood form 200, the width of the form is 0.3m, the central area of the seven areas is denoted as an area 1, the central area is alternately and sequentially marked with areas to two sides, the two sides of the area 1 are respectively denoted as one side and the other side, one side of the area 1 is denoted as an area 2, the other side is denoted as an area 3, the areas are alternately and continuously arranged in turn, one side is denoted as an area 4, the other side is denoted as an area 5, the areas are alternately arranged in turn, one side is denoted as an area 6, and the other side is denoted as an area 7; a telescopic conductive copper electrode plate is embedded in the template, and a relationship that the electrode plate can be detached from the template exists between the template and the electrode plate; the electrode sheet is preferably a mesh electrode sheet;
2) Pouring a concrete structure, namely pouring from the area 1 according to the pouring principle of the invention, and taking the end of pouring of the areas 6 and 7 as a mark for finishing pouring of the structure;
3) Because the curing environment temperature is-15 ℃, the whole-area electric excitation curing method is adopted, after pouring of each area is completed, the areas are immediately subjected to electric excitation curing, firstly 10V voltage is applied to the areas, the resistance values of the areas are obtained through an intelligent control system, the curing temperature is set to be 50 ℃, the required electric power is judged based on the following formula, the power applied to the concrete structure of the areas is adjusted by taking 50W as gradient, and each time interval is 20min. And (3) in the maintenance process, the temperature development of the test piece is observed and fed back in real time.
4) Based on a maturity theoretical formula, calculating that a test piece required by the concrete structure to reach 7-day strength under standard curing conditions is 2.8 days based on the following formula, setting the engineering curing period to be 3 days in consideration of actual negative temperature environment, and performing power-off treatment on the test piece after curing for 3 days under the curing conditions of 50 ℃ in the area 1-7.
5) After curing of the areas 1-7 is completed, removing the detachable wood templates, reserving the electrode plates, pouring fresh concrete under the same conditions into template gaps among the areas 1 and 2, the areas 4 and 6 and the areas 3 and 5, and curing the concrete in the three areas through the electrode plates in the matrix, wherein the steps are the same as those of 3) and 4);
6) Taking out the electrode plates after the temperature of the concrete in the template gaps among the areas 1 and 2, the areas 4 and 6 and the areas 3 and 5 is reduced to 20 ℃, finishing the curing of the concrete in the template areas, simultaneously pouring fresh concrete into the template gaps among the areas 2 and 4, the areas 1 and 3 and the areas 5 and 7, and curing the concrete in the three areas through the electrode plates in the matrix, wherein the steps are the same as 3) and 4);
7) When the temperature of the concrete in the template gaps between the areas 2 and 4, the areas 1 and 3 and the areas 5 and 7 is reduced to 20 ℃, the electrode plates are taken out, and the curing of the concrete in the template areas is finished;
8) At the moment, the intelligent electric excitation curing process of the concrete with the ultra-long structure is finished, and the total construction period is 9 days.
The present invention is capable of other and further embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The rapid electric excitation maintenance construction method of the ultra-long concrete structure is characterized by comprising the following steps of:
According to the geometrical parameters of the ultra-long concrete structure, carrying out modularized zoning treatment on the ultra-long concrete structure; a plurality of temperature sensors are arranged in the concrete structure mould corresponding to each area, and a detachable template is arranged between every two areas;
a telescopic net-shaped electrode plate is arranged inside and outside the concrete structure mould corresponding to each area, and/or a detachable electrode plate is arranged inside the template;
then pouring fresh concrete, and performing intelligent electric excitation curing on the poured fresh concrete; in the intelligent electric excitation maintenance process, the electrifying voltage is adjusted according to the designed electrifying power, and the electrifying power is adjusted in a step-shaped electrifying power change mode in the adjustment process; the energizing power is designed according to the relation between the electric power and the curing temperature shown in the following formula:
P Electric power +P hydration ＝A[ηd·ΔT+ηf·(T4-Te 4)]
Wherein, P Electric power and P hydration respectively represent the power of electrifying and the power of hydration heat, A represents the area of a heat dissipation surface of the electric-shock curing concrete structure, eta d and eta f respectively represent the heat conductivity coefficient and the radiation heat dissipation coefficient of the electric-shock curing concrete structure, delta T represents the temperature difference between a test piece and the environment, T represents the temperature of the test piece in the curing process, and T e represents the environmental temperature;
In the electric excitation curing process, in the environment that the daily average temperature is more than 20 ℃ or the daily maximum temperature is more than 30 ℃, the electric excitation curing adopts an interval area electric excitation curing method, namely in the electrifying process, the concrete structure of a certain area and the concrete structure of an adjacent area cannot be electrified at the same time, and the concrete structure of the interval area is electrified; in other environments, adopting a full-area electric excitation curing method, namely carrying out electric excitation curing on the whole concrete structure after pouring is finished;
the process of the interval region electric excitation curing method is as follows:
Firstly, carrying out electric excitation curing on the interval region, carrying out electric excitation curing on the rest interval region after the temperature of the concrete of the interval region is reduced to a preset temperature after the electric excitation curing, and dismantling the template after the temperature of the concrete of the interval region is reduced to the preset temperature after the electric excitation curing;
and then pouring fresh concrete into the template gaps among all the areas according to the mode of spacing the template gaps for electric excitation curing, namely pouring fresh concrete into the template gaps at intervals and carrying out electric excitation curing, and then pouring fresh concrete into the rest template gaps and carrying out electric excitation curing.
2. The rapid electro-curing process of an ultra-long concrete structure according to claim 1, wherein the adjustment is performed in a stepwise manner by using 50W as a step and a duration of 20 min.
3. The rapid electro-curing construction method of an ultra-long concrete structure according to claim 2, wherein the electro-curing process is required to meet the temperature difference standard and the temperature standard, namely:
The temperature difference between the temperature of the concrete structure and the ambient temperature is not more than 65 ℃ under the positive temperature condition, and the actual temperature of the structure is not more than 85 ℃;
The temperature difference between the temperature of the concrete structure and the ambient temperature is not more than 90 ℃ under the negative temperature condition, and the actual temperature of the structure is not more than 60 ℃.
4. A rapid electro-curing process for constructing an ultra-long concrete structure according to claim 3, wherein when the electro-curing process does not meet the temperature difference standard and the duration reaches 5min, the power is adjusted, and the duration is adjusted by taking 70W as a step and 10 min.
5. The rapid electro-curing construction method of an ultra-long concrete structure according to claim 4, wherein the regional curing period of the electro-curing process is determined by a maturity theoretical formula;
The theoretical formula of maturity is as follows:
Wherein M c represents the maturity of the concrete structure, and the unit is DEG C h; t i represents the curing temperature at the ith hour; t 0 represents the concrete reference temperature; t i represents curing time in h.
6. The rapid electro-curing process of an ultra-long concrete structure according to claim 5, wherein the whole area electro-curing process comprises the following steps:
Firstly, carrying out electric excitation curing on all areas, and detaching the template after the concrete temperature of all areas is reduced to a preset temperature after the electric excitation curing;
and then pouring fresh concrete into the template gaps among all the areas according to the mode of spacing the template gaps for electric excitation curing, namely pouring fresh concrete into the template gaps at intervals and carrying out electric excitation curing, and then pouring fresh concrete into the rest template gaps and carrying out electric excitation curing.
7. The rapid electro-curing process for constructing an ultra-long concrete structure according to any one of claims 1 to 6, wherein the modular zoning process is performed along the long side of the ultra-long concrete structure, and each zone has a length of not less than 2m and not more than 1/10 of the length of the long side of the ultra-long concrete structure.
8. The rapid electro-curing process of an ultra-long concrete structure of claim 7, wherein the fresh concrete is poured in the order from the middle to the two ends of all the areas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211670290.1A CN115749333B (en) | 2022-12-26 | 2022-12-26 | Rapid electric excitation maintenance construction method for ultra-long concrete structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211670290.1A CN115749333B (en) | 2022-12-26 | 2022-12-26 | Rapid electric excitation maintenance construction method for ultra-long concrete structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115749333A CN115749333A (en) | 2023-03-07 |
| CN115749333B true CN115749333B (en) | 2024-05-24 |
Family
ID=85347464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211670290.1A Active CN115749333B (en) | 2022-12-26 | 2022-12-26 | Rapid electric excitation maintenance construction method for ultra-long concrete structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115749333B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4175418A (en) * | 1978-05-08 | 1979-11-27 | S. L. Steffen | Temperature monitoring and temperature differential control device |
| CN102900200A (en) * | 2012-10-09 | 2013-01-30 | 东南大学 | Intelligent FRP (Fiber Reinforce Plastic)-concrete composite structure and manufacturing method thereof |
| JP2014125757A (en) * | 2012-12-26 | 2014-07-07 | Sato Kogyo Co Ltd | Quality determination method of installed concrete, form removal timing determination method and form removal timing setting method, lifetime estimation method of concrete structure, management method of construction information and form for measuring resistance value of installed concrete |
| JP2020097871A (en) * | 2018-12-19 | 2020-06-25 | 株式会社大林組 | Concrete or mortar curing method |
| CN111424707A (en) * | 2020-04-07 | 2020-07-17 | 中建三局集团有限公司 | Core tube mixed structure overlong basement skip construction method |
| CN111446838A (en) * | 2020-01-21 | 2020-07-24 | 浙江科技学院 | Earthquake energy conversion and utilization device for underground space of building and operation method |
| CN112706266A (en) * | 2020-12-30 | 2021-04-27 | 哈尔滨工业大学 | Reinforced concrete self-maintenance device for winter construction in cold region and maintenance method thereof |
| CN114278107A (en) * | 2022-03-08 | 2022-04-05 | 河北工业大学 | Negative temperature environment concrete structure electric excitation curing method and curing equipment thereof |
| CN114394851A (en) * | 2022-02-26 | 2022-04-26 | 河北工业大学 | Preparation method of high-heating electric shock curing concrete structure |
| CN114478063A (en) * | 2022-02-28 | 2022-05-13 | 河北工业大学 | Gradient temperature electric stimulation curing method for concrete in cold region in winter |
-
2022
- 2022-12-26 CN CN202211670290.1A patent/CN115749333B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4175418A (en) * | 1978-05-08 | 1979-11-27 | S. L. Steffen | Temperature monitoring and temperature differential control device |
| CN102900200A (en) * | 2012-10-09 | 2013-01-30 | 东南大学 | Intelligent FRP (Fiber Reinforce Plastic)-concrete composite structure and manufacturing method thereof |
| JP2014125757A (en) * | 2012-12-26 | 2014-07-07 | Sato Kogyo Co Ltd | Quality determination method of installed concrete, form removal timing determination method and form removal timing setting method, lifetime estimation method of concrete structure, management method of construction information and form for measuring resistance value of installed concrete |
| JP2020097871A (en) * | 2018-12-19 | 2020-06-25 | 株式会社大林組 | Concrete or mortar curing method |
| CN111446838A (en) * | 2020-01-21 | 2020-07-24 | 浙江科技学院 | Earthquake energy conversion and utilization device for underground space of building and operation method |
| CN111424707A (en) * | 2020-04-07 | 2020-07-17 | 中建三局集团有限公司 | Core tube mixed structure overlong basement skip construction method |
| CN112706266A (en) * | 2020-12-30 | 2021-04-27 | 哈尔滨工业大学 | Reinforced concrete self-maintenance device for winter construction in cold region and maintenance method thereof |
| CN114394851A (en) * | 2022-02-26 | 2022-04-26 | 河北工业大学 | Preparation method of high-heating electric shock curing concrete structure |
| CN114478063A (en) * | 2022-02-28 | 2022-05-13 | 河北工业大学 | Gradient temperature electric stimulation curing method for concrete in cold region in winter |
| CN114278107A (en) * | 2022-03-08 | 2022-04-05 | 河北工业大学 | Negative temperature environment concrete structure electric excitation curing method and curing equipment thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115749333A (en) | 2023-03-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106836622B (en) | Multifunctional disassembly-free template made of fiber composite material and preparation method of multifunctional disassembly-free template | |
| CN203097276U (en) | Electric-heating heat preservation formwork | |
| CN115749333B (en) | Rapid electric excitation maintenance construction method for ultra-long concrete structure | |
| CN114478063B (en) | Gradient temperature electric stimulation curing method for concrete in cold region in winter | |
| CN100554598C (en) | The job practices of temperature controlled anticracking in the concreting | |
| CN110230260A (en) | A kind of cold winter reinforced concrete construction method | |
| CN103311507A (en) | High-temperature curing drying room | |
| CN113216482B (en) | Steel truss floor support plate electric heating and heat preservation system | |
| CN103306501A (en) | Energy-saving domestic architecture with cast-in-place industrial gypsum bearing wall and manufacturing method thereof | |
| US2683916A (en) | Method of accelerating the hardening of concrete slabs | |
| CN111873159A (en) | Shield segment concrete electric heating maintenance device and method | |
| Petrov et al. | Numerical modelling of heat treatment of concrete of monolithic structures of buildings in winter conditions of construction | |
| CN102490246B (en) | Concrete prefabricated part making method | |
| CN106801948A (en) | A kind of superstructure dehumidification system | |
| CN104218223B (en) | A kind of power lead-acid battery pole plate high temperature curing process | |
| CN112062601A (en) | Steam curing process for concrete prefabricated part | |
| CN102519072B (en) | Energy-saving electricity-conducting concrete geothermal floorslab and method for manufacturing same | |
| CN104088394A (en) | Building hollow wall large plate integrated with hollow strip plate | |
| CN216949595U (en) | Winter construction concrete intelligent variable power temperature control wall heat preservation template | |
| CN212498260U (en) | Shield constructs section of jurisdiction concrete electrical heating curing means | |
| CN214365075U (en) | Spray maintenance system for concrete beam plate of high-rise building | |
| CN113459258A (en) | Prefabricated part manufacturing mold and method | |
| CN201588308U (en) | Insulation structure of plant operation face and pillar | |
| CN202344671U (en) | Production device for concrete precast element | |
| CN208068531U (en) | A kind of precast slab curing membrane automatic mulch applicator pressing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |