A temperature control construction method for large volume concrete

Abstract

The present invention provides a large-volume concrete temperature control construction method. The large-volume concrete construction adopts a block method, and a left block concrete, a middle block concrete and a right block concrete are constructed in sequence. Before the left block concrete and the right block concrete are poured, temperature sensors are fixedly arranged using vertical steel bars and connecting steel bars respectively. The temperature sensors are used to monitor the concrete temperature in real time, so as to determine the time basis for block pouring, thereby improving the concrete temperature control construction efficiency and construction quality.

Description

Technical Field

[0001] The invention relates to the field of concrete engineering, and in particular to a temperature control construction method for large-volume concrete. Background Art

[0002] Concrete is the most important building material in modern engineering. It has been widely used in various construction projects due to its low price and good mechanical properties. When the cementitious material in concrete reacts chemically with water, a large amount of heat will be generated. However, concrete itself is a poor conductor of heat. This results in a large amount of heat generated inside the concrete due to the hydration reaction after the concrete is poured. The heat cannot be dissipated in time, and the internal temperature of the concrete is significantly higher than the external temperature during the pouring period. This temperature difference will cause a large temperature stress to be generated during the concrete pouring, especially on the concrete surface, resulting in a large temperature tensile stress. Once the temperature tensile stress exceeds the tensile strength of the concrete, it will cause stress damage on the concrete surface and produce temperature cracks, affecting the normal use and structural safety of the concrete.

[0003] Methods for controlling the temperature of concrete include cooling water pipes, layered and block pouring, skip-bin construction, and optimization of concrete mix ratios. However, most of these measures are relatively complicated. Block pouring is a relatively simple construction method, but it is difficult to effectively determine the time interval between blocks, which will affect the pouring performance of concrete. How to determine a reasonable interval time for block construction to improve the efficiency and quality of concrete block pouring is an important technical issue of the block construction method. Summary of the invention

[0004] In view of the problems of the prior art, the present invention provides a large-volume concrete temperature control construction method, which improves the temperature control construction effect through reasonable temperature control measures.

[0005] The present invention provides a large-volume concrete temperature control construction method, wherein the large-volume concrete construction adopts a block method, and along the length direction of the large-volume concrete, a left block of concrete, a middle block of concrete and a right block of concrete are respectively arranged, and the left block of concrete, the middle block of concrete and the right block of concrete are sequentially connected, and the left block of concrete is poured first, and then the middle block of concrete is poured, and finally the right block of concrete is poured, and the left block of concrete, the middle block of concrete and the right block of concrete are all rectangular structures, and the characteristic is that the construction method comprises the following steps:

[0006] S1: Processing the foundation of the left concrete block, arranging a first vertical steel bar at the center of the left concrete block, wherein the bottom of the first vertical steel bar penetrates into the foundation of the left concrete block, and the top of the first vertical steel bar is located at the center of the left concrete block, and arranging a first connecting steel bar on the right side of the left concrete block, wherein the first connecting steel bar is flush with the top of the first vertical steel bar and is located at the center of the right side of the left concrete block, and one end of the first connecting steel bar penetrates into the left concrete block, and the other end protrudes out of the left concrete block;

[0007] S2: a first temperature sensor is arranged on the top of the first vertical steel bar, and a second temperature sensor is arranged at one end of the first connecting steel bar extending out of the left concrete block;

[0008] S3: After the first temperature sensor and the second temperature sensor are fixed, pour the left block of concrete, and monitor the temperature T1 of the first temperature sensor and the temperature T2 of the second temperature sensor in real time. The monitoring time interval between the first temperature sensor and the second temperature sensor is 5 minutes.

[0009] S4: When the temperature T1 of the first sensor reaches a peak value and is in a cooling stage, and the difference between the temperature T1 of the first sensor and the temperature T2 of the second temperature sensor is less than T10 for three consecutive times, pouring of the middle block concrete begins, and T10 is a first set temperature difference;

[0010] S5: before pouring the middle concrete block, the foundation is cleaned, a second vertical steel bar is arranged at the center of the middle concrete block, the bottom of the second vertical steel bar penetrates into the foundation of the middle concrete block, the top of the second vertical steel bar is located at the center of the middle concrete block, a second connecting steel bar is arranged on the right side of the middle concrete block, the second connecting steel bar is flush with the top of the second vertical steel bar and is located at the center of the right side of the middle concrete block, one end of the second connecting steel bar penetrates into the middle concrete block, and the other end protrudes out of the middle concrete block;

[0011] S6: a third temperature sensor is arranged on the top of the second vertical steel bar, and a fourth temperature sensor is arranged on one end of the second connecting steel bar extending out of the middle concrete block;

[0012] S7: After the third temperature sensor and the fourth temperature sensor are fixed, the middle block concrete is poured, the portion of the first connecting steel bar extending out of the left block concrete and the second temperature sensor are poured in the middle block concrete, and the temperature T3 of the third temperature sensor and the temperature T4 of the fourth temperature sensor are monitored in real time, and the monitoring time interval of the third temperature sensor and the fourth temperature sensor is 5 minutes;

[0013] S8: When the temperature T3 of the third sensor reaches a peak value and is in a cooling stage, and the difference between the temperature T3 of the third sensor and the temperature T4 of the fourth temperature sensor is less than T20 for three consecutive times, and the difference between the temperature T3 of the third temperature sensor and the temperature T2 of the second temperature sensor is less than T30 for three consecutive times, the right block of concrete is poured, and T20 is the second set temperature difference, and T30 is the third set temperature difference;

[0014] S9: before pouring the right concrete block, the foundation is cleaned, the portion of the second connecting steel bar extending out of the middle concrete block and the fourth temperature sensor are poured into the right concrete block, and after the pouring of the right concrete block is completed, curing is performed, and after the curing is completed, the block construction of the large-volume concrete is completed.

[0015] Preferably, the length of the first connecting steel bar penetrating into the left block concrete is less than 1 / 20 of the length of the left block concrete, the length of the first connecting steel bar protruding from the left block concrete is less than 1 / 15 of the length of the left block concrete, the length of the second connecting steel bar penetrating into the middle block concrete is less than 1 / 20 of the length of the middle block concrete, and the length of the second connecting steel bar protruding from the middle block concrete is less than 1 / 15 of the length of the middle block concrete.

[0016] Preferably, the length of the left concrete block and the length of the middle concrete block are the dimensions of the left concrete block and the middle concrete block along the length direction of the mass concrete.

[0017] Preferably, before pouring the middle concrete block, the right side surface of the left concrete block is roughened to improve the connection performance between the left concrete block and the middle concrete block; before pouring the right concrete block, the right side surface of the middle concrete block is roughened to improve the connection performance between the middle concrete block and the right concrete block.

[0018] The first connecting steel bar is flush with the top of the first vertical steel bar, and the second connecting steel bar is flush with the top of the second vertical steel bar, that is, the top of the connecting steel bar and the top of the vertical steel bar are at the same height, thereby ensuring that the first connecting steel bar and the second connecting steel bar are located at the center of the concrete side.

[0019] The working principle of the present invention is as follows:

[0020] For large-volume concrete, pouring in blocks can effectively reduce the pouring size of concrete and is beneficial to the temperature diffusion inside the concrete. However, for concrete poured in blocks, the selection of pouring intervals is particularly important. If the pouring intervals cannot be effectively controlled, temperature cracks may appear in the poured concrete. Therefore, sufficient heat dissipation of the poured concrete should be ensured during pouring.

[0021] The present invention provides a reasonable interval time for concrete pouring in blocks, wherein the left block concrete is poured first, the center of the left block concrete is provided with a first temperature sensor, which is used to respond to the center point temperature of the left block concrete, and the right side of the left block concrete is provided with a first connecting steel bar, the part of which protruding from the left block concrete is provided with a second temperature sensor, which is used to respond to the ambient temperature of the left block concrete, and the temperature values ​​monitored by the first temperature sensor and the second temperature sensor are monitored in real time, and the difference is calculated. When the difference is less than a set value and the center point is already in a cooling stage, it is considered that the heat dissipation process inside the concrete has tended to be stable, and the pouring of the middle block concrete can be carried out. In order to avoid errors in the set value, three consecutive temperature differences or five consecutive temperature differences can be selected. When the temperature differences of several consecutive times are all less than the set value, the pouring of the middle block concrete is carried out. This method is more scientific and reasonable, does not need to measure the temperature of the concrete blocks as a whole, reduces the construction difficulty and engineering investment, and only uses the center point temperature and the outside temperature as the interval basis for the pouring of the blocks.

[0022] The inventive concept of the present invention is that the second temperature sensor can be used to reflect the external temperature of the left block of concrete before the middle block of concrete is poured, and after the middle block of concrete is poured, the second temperature sensor can be used to reflect the boundary point temperature of the middle block of concrete, the third temperature sensor is located at the center point of the middle block of concrete, and the fourth temperature sensor is located at the outer environment of the middle block of concrete. The temperature point values ​​of the second temperature sensor, the third temperature sensor and the fourth temperature sensor are used to reflect the cooling state of the middle block of concrete and determine the pouring time of the right block of concrete. In order to avoid measurement errors, a multiple judgment method is still used. When several judgments meet the conditions, it is considered that the judgment requirements of the time interval are met.

[0023] The pouring of the middle block concrete is particularly important. The present invention uses temperature sensors at three points, namely, the center point, the boundary point, and the external point, to reflect the cooling state. The right block concrete is poured only when the difference between the temperature T3 of the third sensor and the temperature T4 of the fourth temperature sensor is less than T20, and the difference between the temperature T3 of the third temperature sensor and the temperature T2 of the second temperature sensor is less than T30. The difference between the temperature T3 of the third sensor and the temperature T4 of the fourth temperature sensor reflects the cooling state inside and outside the concrete, while the difference between the temperature T3 of the third temperature sensor and the temperature T2 of the second temperature sensor reflects the cooling state inside the concrete. The first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor all need to be continuously monitored to obtain the temperature state of the entire pouring block concrete, until all concrete pouring is completed and has run for a period of time, and then the monitoring of the temperature sensors is stopped.

[0024] The pouring of the right block of concrete does not involve the pouring of subsequent blocks, and timely maintenance is required after the pouring is completed. The present invention realizes the setting of different monitoring points by setting the connecting steel bars, thereby realizing the scientific and data judgment of the cooling state of the concrete, improving the rationality of the temperature control construction, and the construction method is simple and easy to implement, and can provide scientific and reasonable guidance for the concrete poured in blocks.

[0025] The advantages of the present invention are:

[0026] The present invention provides a large-volume concrete temperature control construction method. The large-volume concrete construction adopts a block method, and a left block concrete, a middle block concrete and a right block concrete are constructed in sequence. Before the left block concrete and the right block concrete are poured, temperature sensors are fixedly arranged using vertical steel bars and connecting steel bars respectively. The temperature sensors are used to monitor the concrete temperature in real time, so as to determine the time basis for block pouring, thereby improving the concrete temperature control construction efficiency and construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a three-dimensional schematic diagram of the left concrete block;

[0029] Figure 3 It is the cross-sectional schematic diagram of the left concrete block;

[0030] Figure 4 This is a schematic diagram of the connection between the middle block of concrete and the left block of concrete. DETAILED DESCRIPTION

[0031] The following is a detailed explanation of the contents defined in the present invention.

[0032] The present invention provides a large-volume concrete temperature control construction method, wherein the large-volume concrete construction adopts a block method, and along the length direction of the large-volume concrete, a left block concrete 1, a middle block concrete 2 and a right block concrete 3 are respectively arranged, and the left block concrete 1, the middle block concrete 2 and the right block concrete 3 are sequentially connected, and the left block concrete 1 is poured first, and then the middle block concrete 2 is poured, and finally the right block concrete 3 is poured, and the left block concrete 1, the middle block concrete 2 and the right block concrete 3 are all rectangular structures, and the characteristic is that the construction method comprises the following steps:

[0033] S1: Processing the foundation of the left concrete block 1, arranging a first vertical steel bar 4 at the center of the left concrete block 1, wherein the bottom of the first vertical steel bar 4 penetrates into the foundation of the left concrete block 1, and the top of the first vertical steel bar 4 is located at the center of the left concrete block 1, and arranging a first connecting steel bar 5 on the right side of the left concrete block 1, wherein the first connecting steel bar 5 is flush with the top of the first vertical steel bar 4 and is located at the center of the right side of the left concrete block 1, and one end of the first connecting steel bar 5 penetrates into the left concrete block 1, and the other end extends out of the left concrete block 1;

[0034] S2: a first temperature sensor 6 is arranged on the top of the first vertical steel bar 4, and a second temperature sensor 7 is arranged on the end of the first connecting steel bar 5 extending out of the left concrete block 1;

[0035] S3: After the first temperature sensor 6 and the second temperature sensor 7 are fixed, the left block of concrete 1 is poured, and the temperature T1 of the first temperature sensor 6 and the temperature T2 of the second temperature sensor 7 are monitored in real time. The monitoring time interval of the first temperature sensor 6 and the second temperature sensor 7 is 5 minutes;

[0036] S4: When the temperature T1 of the first sensor reaches a peak value and is in a cooling stage, and the difference between the temperature T1 of the first sensor and the temperature T2 of the second temperature sensor 7 is less than T10 for three consecutive times, the pouring of the middle block concrete 2 begins, and T10 is the first set temperature difference;

[0037] S5: before pouring the middle concrete block 2, the foundation is cleaned, a second vertical steel bar 8 is arranged at the center of the middle concrete block 2, the bottom of the second vertical steel bar 8 penetrates into the foundation of the middle concrete block 2, the top of the second vertical steel bar 8 is located at the center of the middle concrete block 2, a second connecting steel bar 9 is arranged on the right side of the middle concrete block 2, the second connecting steel bar 9 is flush with the top of the second vertical steel bar 8, and is located at the center of the right side of the middle concrete block 2, one end of the second connecting steel bar 9 penetrates into the middle concrete block 2, and the other end extends out of the middle concrete block 2;

[0038] S6: a third temperature sensor 10 is arranged on the top of the second vertical steel bar 8, and a fourth temperature sensor 11 is arranged on one end of the second connecting steel bar 9 extending out of the middle concrete block 2;

[0039] S7: After the third temperature sensor 10 and the fourth temperature sensor 11 are fixed, the middle block concrete 2 is poured, the portion of the first connecting steel bar 5 extending out of the left block concrete 1 and the second temperature sensor 7 are poured in the middle block concrete 2, and the temperature T3 of the third temperature sensor 10 and the temperature T4 of the fourth temperature sensor 11 are monitored in real time, and the monitoring time interval of the third temperature sensor 10 and the fourth temperature sensor 11 is 5 minutes;

[0040] S8: When the temperature T3 of the third sensor reaches the peak value and is in the cooling stage, and the difference between the temperature T3 of the third sensor and the temperature T4 of the fourth temperature sensor 11 is less than T20 for three consecutive times, and the difference between the temperature T3 of the third temperature sensor 10 and the temperature T2 of the second temperature sensor 7 is less than T30 for three consecutive times, the right block of concrete 3 is started to be poured, and T20 is the second set temperature difference, and T30 is the third set temperature difference;

[0041] S9: before pouring the right concrete block 3, the foundation is cleaned, the portion of the second connecting steel bar 9 extending out of the middle concrete block 2 and the fourth temperature sensor 11 are poured into the right concrete block 3, and the right concrete block 3 is cured after being poured. After the curing is completed, the block construction of the large-volume concrete is completed.

[0042] Preferably, the length of the first connecting steel bar 5 penetrating into the left concrete block 1 is less than 1 / 20 of the length of the left concrete block 1, the length of the first connecting steel bar 5 extending out of the left concrete block 1 is less than 1 / 15 of the length of the left concrete block 1, the length of the second connecting steel bar 9 penetrating into the middle concrete block 2 is less than 1 / 20 of the length of the middle concrete block 2, and the length of the second connecting steel bar 9 extending out of the middle concrete block 2 is less than 1 / 15 of the length of the middle concrete block 2.

[0043] Preferably, the length of the left concrete block 1 and the length of the middle concrete block 2 are the dimensions of the left concrete block 1 and the middle concrete block 2 along the length direction of the large volume concrete.

[0044] Preferably, the right side surface of the left concrete block 1 is roughened before pouring the middle concrete block 2 to improve the connection performance between the left concrete block 1 and the middle concrete block 2; and the right side surface of the middle concrete block 2 is roughened before pouring the right concrete block 3 to improve the connection performance between the middle concrete block 2 and the right concrete block 3.

[0045] In step S4 and step S8, the temperature of the temperature sensor at the center point is used to judge the state of the concrete. Generally, after pouring is completed, the temperature of the center point will continue to rise until it reaches the temperature peak. At this time, the heat generation of the concrete is greater than the heat dissipation. As the hydration reaction tends to be stable, the heat generation decreases, and the concrete will be in a cooling state. The cooling stage can be judged by the fact that the center point temperature reaches the peak and then continues to decline as a basis for judgment. For example, after reaching the peak, the temperature drops for several consecutive times. Then, the difference between the center point and the boundary point, and the center point and the external environment temperature is judged as a basis for judging the heat dissipation state and determining the pouring of the next block of concrete.

[0046] The first temperature sensor 6, the second temperature sensor 7, the third temperature sensor 10 and the fourth temperature sensor 11 are all connected to the display system through communication lines to display the real-time data of the monitored points. The display system also has an analysis and judgment function. When the judgment conditions in step S4 and step S8 are met, the display system can give a judgment signal to provide necessary judgment reminders to engineering and technical personnel.

[0047] The pouring sizes of the left concrete block 1, the middle concrete block 2 and the right concrete block 3 can be determined by simulating the working conditions of the temperature control simulation calculation of the mass concrete, so as to determine the reasonable pouring size. The pouring size can meet the anti-cracking requirements of the concrete without water pipes and ensure a certain safety margin. In order to ensure the pouring quality, the size of the middle concrete block 2 can also be slightly smaller than the left concrete block 1 and the right concrete block 3.

[0048] The settings of the first set temperature difference T10, the second set temperature difference T20, and the third set temperature difference T30 can be determined according to the pouring season and the pouring size of the concrete, wherein the third set temperature T30 should be greater than the second set temperature difference T20; the specific selection of the first set temperature difference T10, the second set temperature difference T20, and the third set temperature difference T30 can also be achieved through simulation design, for example, by simulating the temperature control construction process through ANSYS software, and according to the simulation results, reasonably determining the first set temperature difference T10, the second set temperature difference T20, and the third set temperature difference T30.

[0049] When there is no data, the first set temperature difference T10 and the third set temperature difference T30 can be set to 15-25°C; the second set temperature difference T20 is 15-18°C, which needs to be reasonably determined according to the buried position of the temperature sensor.

[0050] The above-mentioned embodiments are only preferred embodiments of the present invention. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also includes equivalent technical means that can be thought of by those skilled in the art based on the concept of the present invention.

Claims

1. A method for temperature control construction of large-volume concrete, wherein the large-volume concrete is constructed by block construction, and a left block of concrete, a middle block of concrete and a right block of concrete are respectively arranged along the length direction of the large-volume concrete, and the left block of concrete, the middle block of concrete and the right block of concrete are connected in sequence, and the left block of concrete is poured first, and then the middle block of concrete is poured, and finally the right block of concrete is poured, and the left block of concrete, the middle block of concrete and the right block of concrete are all rectangular structures, characterized in that: The construction method comprises the following steps: S1: Processing the foundation of the left concrete block, arranging a first vertical steel bar at the center of the left concrete block, wherein the bottom of the first vertical steel bar penetrates into the foundation of the left concrete block, and the top of the first vertical steel bar is located at the center of the left concrete block, and arranging a first connecting steel bar on the right side of the left concrete block, wherein the first connecting steel bar is flush with the top of the first vertical steel bar and is located at the center of the right side of the left concrete block, and one end of the first connecting steel bar penetrates into the left concrete block, and the other end protrudes out of the left concrete block; S2: a first temperature sensor is arranged on the top of the first vertical steel bar, and a second temperature sensor is arranged at one end of the first connecting steel bar extending out of the left concrete block; S3: After the first temperature sensor and the second temperature sensor are fixed, pour the left block of concrete, and monitor the temperature T1 of the first temperature sensor and the temperature T2 of the second temperature sensor in real time. The monitoring time interval between the first temperature sensor and the second temperature sensor is 5 minutes. S4: When the temperature T1 of the first temperature sensor reaches a peak value and is in a cooling stage, and the difference between the temperature T1 of the first temperature sensor and the temperature T2 of the second temperature sensor is less than T10 for three consecutive times, pouring of the middle block concrete begins, and T10 is a first set temperature difference; S5: before pouring the middle concrete block, the foundation is cleaned, a second vertical steel bar is arranged at the center of the middle concrete block, the bottom of the second vertical steel bar penetrates into the foundation of the middle concrete block, the top of the second vertical steel bar is located at the center of the middle concrete block, a second connecting steel bar is arranged on the right side of the middle concrete block, the second connecting steel bar is flush with the top of the second vertical steel bar and is located at the center of the right side of the middle concrete block, one end of the second connecting steel bar penetrates into the middle concrete block, and the other end protrudes out of the middle concrete block; S6: a third temperature sensor is arranged on the top of the second vertical steel bar, and a fourth temperature sensor is arranged on one end of the second connecting steel bar extending out of the middle concrete block; S7: After the third temperature sensor and the fourth temperature sensor are fixed, the middle block concrete is poured, the portion of the first connecting steel bar extending out of the left block concrete and the second temperature sensor are poured in the middle block concrete, and the temperature T3 of the third temperature sensor and the temperature T4 of the fourth temperature sensor are monitored in real time, and the monitoring time interval of the third temperature sensor and the fourth temperature sensor is 5 minutes; S8: When the temperature T3 of the third temperature sensor reaches a peak value and is in a cooling stage, and the difference between the temperature T3 of the third temperature sensor and the temperature T4 of the fourth temperature sensor is less than T20 for three consecutive times, and the difference between the temperature T3 of the third temperature sensor and the temperature T2 of the second temperature sensor is less than T30 for three consecutive times, the right block of concrete is poured, and T20 is the second set temperature difference, and T30 is the third set temperature difference; S9: before pouring the right concrete block, the foundation is cleaned, the portion of the second connecting steel bar extending out of the middle concrete block and the fourth temperature sensor are poured into the right concrete block, and after the pouring of the right concrete block is completed, curing is performed, and after the curing is completed, the block construction of the large-volume concrete is completed.

2. The mass concrete temperature control construction method according to claim 1, characterized in that: The length of the first connecting steel bar penetrating into the left block concrete is less than 1 / 20 of the length of the left block concrete, the length of the first connecting steel bar protruding from the left block concrete is less than 1 / 15 of the length of the left block concrete, the length of the second connecting steel bar penetrating into the middle block concrete is less than 1 / 20 of the length of the middle block concrete, and the length of the second connecting steel bar protruding from the middle block concrete is less than 1 / 15 of the length of the middle block concrete.

3. The mass concrete temperature control construction method according to claim 2, characterized in that: The length of the left concrete block and the length of the middle concrete block are the dimensions of the left concrete block and the middle concrete block along the length direction of the mass concrete.

4. The mass concrete temperature control construction method according to claim 1, characterized in that: Before pouring the middle concrete block, the right side surface of the left concrete block is roughened to improve the connection performance between the left concrete block and the middle concrete block; before pouring the right concrete block, the right side surface of the middle concrete block is roughened to improve the connection performance between the middle concrete block and the right concrete block.

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