A crack control construction method for large-volume concrete without reinforcement

Abstract

The present invention discloses a method for controlling cracks in large-volume concrete without reinforcement, including arranging a plurality of hoses at corresponding positions, each hose being provided with a reinforcing mechanism for supporting the hose; mixing high-strength heat-conducting fibers into concrete, and performing a pouring process of large-volume concrete, during which the hose is pre-buried in the large-volume concrete; passing cold water into the hose to assist in cooling the concrete; after the large-volume concrete without reinforcement is formed, the reinforcing mechanism is removed from the hose, and the hose is blocked and filled with a filler. The present invention reduces the temperature difference in the large-volume concrete without reinforcement by heat conduction of high-strength heat-conducting fibers and hoses, thereby achieving the effect of controlling cracks and preventing cracks, and the high-strength heat-conducting fibers further strengthen the interior of the concrete, improving the quality of the concrete structure, and the hose and reinforcing mechanism can provide space for the concrete to expand when heated, supporting and preventing the interior of the concrete.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete construction, and more specifically, to a method for controlling cracks in large-volume concrete without reinforcement. Background Art

[0002] Unreinforced concrete refers to a concrete structure without reinforcement or without stress-bearing steel bars, while unreinforced mass concrete refers to a large volume of concrete with a minimum geometric dimension of no less than 1m. Mass concrete pouring is an important part of engineering construction, and mass concrete crack control is a key issue in the mass concrete pouring process and a major difficulty in concrete pouring. For example, the mass concrete drainage crack prevention and temperature control system of announcement number CN117569626A, and the mass concrete crack prevention method under spring pouring conditions in a strong constraint zone of super-strong bedrock of announcement number CN111910641A, etc., in the construction process of mass concrete structure, the hydration reaction of cement will generate a large amount of hydration heat, the hydration heat inside the concrete is accumulated and not easy to dissipate, the hydration temperature rises high, and the surface heat dissipates quickly, so that a large temperature difference is formed between the inside and the surface of the concrete, and the external cold concrete is constrained by the expansion and contraction of the internal hot concrete, thereby generating temperature stress, which leads to the mass concrete being prone to temperature cracks during the hardening process, reducing the bearing capacity, waterproof performance and durability of the mass concrete, and affecting the safety and normal use of the concrete structure. Summary of the invention

[0003] One object of the present invention is to provide a method for controlling cracks in large-volume concrete without reinforcement. The temperature difference in large-volume concrete without reinforcement is reduced by heat conduction of high-strength thermal conductive fibers and cooling of the interior of large-volume concrete by a hose, thereby achieving the effect of controlling and preventing cracks. The high-strength thermal conductive fibers can further strengthen the interior of the concrete and improve the quality of the concrete structure. The hose and the reinforcement mechanism can provide space for the concrete to expand due to heat, thereby supporting and preventing the interior of the concrete from cracking.

[0004] In order to solve the above technical problems, the present invention provides a method for controlling cracking of unreinforced mass concrete, comprising the following steps:

[0005] Step 1: According to the set position requirements, multiple hoses are arranged at corresponding positions, which are arranged in intervals from top to bottom, and a reinforcing mechanism is correspondingly arranged in each hose to support the hose;

[0006] Step 2: high-strength thermal conductive fibers are mixed into concrete, and the concrete mixed with high-strength thermal conductive fibers is used to cast large-volume concrete, and the hose is pre-buried in the large-volume concrete during the casting process;

[0007] Step 3: During the solidification and forming of the large-volume concrete to form the unreinforced large-volume concrete, cold water is introduced into the hose to assist in cooling the concrete;

[0008] Step 4: After the unreinforced mass concrete is formed, the reinforcing mechanism is removed from the hose, and the hose is sealed and filled with fillers.

[0009] Preferably, the step one also includes arranging a plurality of copper wires at corresponding positions according to set position requirements, which are arranged parallel to the hose, the plurality of copper wires are arranged at intervals from top to bottom and in the same horizontal plane, and the plurality of copper wires are arranged in a staggered manner in the horizontal and vertical directions.

[0010] Preferably, the distance between the multiple hoses ranges from 4m to 8m, and the distance between the copper wire closest to the hose and the corresponding hose ranges from 30cm to 60cm.

[0011] Preferably, the amount of the high-strength thermally conductive fiber used is between 0.6kg / m³ and 1.8kg / m³, and the high-strength thermally conductive fiber is carbon fiber.

[0012] Preferably, the reinforcing mechanism includes a pair of arc-shaped mesh plates arranged opposite to each other, a plurality of supporting components arranged between the pair of arc-shaped mesh plates, and a plurality of arc-shaped blocks arranged on the outside of the arc-shaped mesh plates. The pair of arc-shaped mesh plates are just located in the hose and are arranged close to the inner wall of the hose. The arc-shaped mesh plates and the hose are of equal length. The plurality of supporting components are used to support the pair of arc-shaped mesh plates so that the arc-shaped mesh plates are arranged close to the inner wall of the hose. The plurality of arc-shaped blocks are used to press out an arc on the hose to tighten the reinforcing mechanism.

[0013] Preferably, the plurality of arc-shaped blocks are located at two end positions of the plurality of support components in a one-to-one correspondence.

[0014] Preferably, the support assembly includes a support column, which has a hollow structure inside and through holes penetrating into the hollow structure are arranged at the centers of both ends of the support column, and two T-shaped drive columns are slidingly arranged in the through holes at both ends of the support column, and the bottom ends of the two drive columns are relatively fixed inside a pair of arc-shaped mesh plates, and the ends are slidingly fitted on the inner wall of the internal hollow structure of the support column, and a connecting sleeve is also arranged on the inner wall of the internal hollow structure of the support column, and a pair of threaded sleeves are fixedly arranged inside the connecting sleeve, and springs are arranged between the ends of the pair of threaded sleeves and the ends of the two drive columns.

[0015] Preferably, the threaded sleeve has an internal threaded channel, and a pair of rotating rods are also provided in the internal hollow structure of the support column, and both ends of the rotating rods are respectively fixedly connected to the rotating parts rotatably arranged at both ends of the support column, and the rotating rods are correspondingly free to pass through a pair of springs, two driving columns and the internal threaded channel inside the threaded sleeve, and the outer wall of the rotating rod is correspondingly provided with external threads to match the internal threaded channel.

[0016] Preferably, at least two connecting mechanisms are provided inside a pair of curved mesh panels, and the connecting mechanisms include a pair of connecting parts relatively arranged on the inner walls of a pair of curved mesh panels, and the connecting parts include an L-shaped connecting rod, a connecting block fixedly arranged on the inner end of the connecting rod, and a hook rotatably arranged on the connecting block, and the outer end of the connecting rod is fixedly arranged on the curved mesh panel.

[0017] Preferably, in step one, after the hose is set, before step two is performed, the method further includes: first, squeezing a pair of arc-shaped mesh plates so that the pair of arc-shaped mesh plates are close to each other until the hooks of the plurality of connection mechanisms are hooked one by one, thereby connecting and fixing the pair of arc-shaped mesh plates close to each other, and at this time, the springs corresponding to the support components are all compressed; secondly, inserting the fixed pair of arc-shaped mesh plates into the hose with both ends aligned; thirdly, separating the hooks, and under the elastic force of the springs, the arc-shaped blocks of the pair of arc-shaped mesh plates squeeze the hose to form an arc, and the pair of arc-shaped mesh plates are tightly fixed to the inside of the hose;

[0018] In the step 4, the method of taking the reinforcing mechanism out of the hose is: squeezing a pair of arc-shaped mesh plates and then pulling them out of the hose.

[0019] The present invention has at least the following beneficial effects:

[0020] 1. The present invention reduces the temperature difference in the unreinforced mass concrete by heat conduction of high-strength thermal conductive fibers and cooling of the interior of the mass concrete by a hose, thereby achieving the effect of crack control and crack prevention. The high-strength thermal conductive fibers can further strengthen the interior of the concrete and improve the quality of the concrete structure.

[0021] 2. The arrangement of the hose and the reinforcing mechanism of the present invention can provide space for concrete to expand due to heat, support the interior of the concrete and prevent cracking. The solidified concrete can limit the arc blocks and other components on the outside of the reinforcing mechanism, thereby improving the stability of the reinforcing mechanism and preventing the reinforcing mechanism from shaking or loosening under the impact of the water flow in the hose, thereby improving stability.

[0022] 3. During the construction process of the construction method of the present invention, temperature cracks will basically not occur in the mass concrete during the hardening process, and the bearing capacity, waterproof performance and durability of the mass concrete will be greatly improved, meeting the actual construction and use requirements, making the concrete structure safe and able to be used normally.

[0023] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the internal structure of the overall structure of the present invention;

[0025] Figure 2 For the present invention Figure 1 A magnified view of the structure in the middle;

[0026] Figure 3 This is an enlarged view of the arc-shaped screen plate structure of the present invention.

[0027] Description of reference numerals:

[0028] 1. Mass concrete, 2. High-strength thermal conductive fiber, 21. Hose, 3. Arc mesh plate, 34. Arc block, 4. Connecting mechanism, 41. Connecting rod, 42. Hook, 43. Connecting block, 5. Copper wire, 6. Support assembly, 61. Support column, 62. Hollow structure, 63. Rotating rod, 64. Threaded sleeve, 65. Spring, 66. Rotating part, 67. Driving column, 68. External thread. DETAILED DESCRIPTION

[0029] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0030] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] like Figures 1 to 3 As shown, the present invention provides a method for controlling cracking of unreinforced mass concrete, comprising the following steps:

[0032] Step 1: According to the set position requirements, multiple hoses 21 are arranged at corresponding positions, which are arranged in intervals from top to bottom, and each hose 21 is correspondingly provided with a reinforcing mechanism for supporting the hose 21;

[0033] It also includes arranging several copper wires 5 at corresponding positions according to the set position requirements, which are arranged in parallel with the hose 21, and the several copper wires 5 are arranged at intervals from top to bottom and in the same horizontal plane, and the several copper wires 5 are arranged in a staggered manner in the horizontal and vertical directions. The copper wires 5 and the hose 21 are arranged at intervals in the same horizontal plane and vertically according to actual conditions, and the copper wires 5 are arranged in a staggered manner in the horizontal plane and the vertical plane. The spacing between multiple hoses 21 ranges from 4m to 8m, and the spacing between the copper wire 5 closest to the hose 21 and the corresponding hose 21 ranges from 30cm to 60cm. The ratio of high-strength heat-conducting fiber 2 is between 0.6kg / m³ and 1.8kg / m³. Copper wire 5 and hose 21 are arranged in parallel. There is no special requirement for the spacing between copper wires 5, which is determined according to the actual situation. The heat-conducting fiber and copper wire 5 are in contact. The number of hoses 21 is determined according to the volume of concrete, and the spacing between hoses 21 is generally between 4m-8m. The spacing between the copper wire 5 closest to the hose 21 and the hose 21 is 30cm-60cm. The arrangement of hoses 21 depends on the actual situation. More hoses 21 can be arranged in some locations with serious heat generation, and the arrangement of hoses 21 can be appropriately reduced in locations where heat dissipation is easy.

[0034] The high-strength thermally conductive fiber 2 is a high-strength thermally conductive fiber 2 having thermal conductivity and high strength, such as carbon fiber.

[0035] Step 2: high-strength thermal conductive fibers 2 are mixed into concrete, and the concrete mixed with high-strength thermal conductive fibers 2 is used to cast the mass concrete 1 . During the casting process, the hose 21 is pre-buried in the mass concrete 1 .

[0036] Step 3: During the solidification of the mass concrete 1 to form the unreinforced mass concrete 1, cold water is introduced into the hose 21 to assist the concrete in cooling down; during cooling down, the cold water is injected into the hose 21, and the flow of the cold water in the hose 21 facilitates the cooling down of the concrete.

[0037] Step 4: After the unreinforced mass concrete 1 is formed, the reinforcing mechanism is taken out from the hose 21, and the hose 21 is sealed and filled with a filler; the filler may also be concrete, which is injected into the hose 21 by a pump.

[0038] The crack control construction method of the present application mainly includes arranging a heat conductor and a hose 21 inside the unreinforced mass concrete 1, wherein the heat conductor includes a high-strength heat-conducting fiber 2 arranged in the mass concrete 1 for heat conduction and reinforcement of the interior of the concrete, and a plurality of hoses 21 pre-buried in the mass concrete 1 for cooling the concrete by passing water, wherein a reinforcing mechanism is arranged in the hose 21, and the reinforcing mechanism includes two groups of arc-shaped mesh plates 3 that cooperate and abut on both sides of the inner wall of the hose 21, a connecting mechanism 4 fixedly arranged on the inner side of the two groups of the arc-shaped mesh plates 3, and a supporting assembly 6. The present invention reduces the temperature difference in the unreinforced mass concrete 1 by heat conduction of the high-strength heat-conducting fiber 2 and cooling of the interior of the mass concrete 1 by the hose 21, thereby achieving the effect of crack control and crack prevention.

[0039] In another technical solution, the reinforcing mechanism includes a pair of arc-shaped mesh plates 3 arranged opposite to each other, a plurality of supporting components 6 arranged between the pair of arc-shaped mesh plates 3, and a plurality of arc-shaped blocks 34 arranged outside the arc-shaped mesh plates 3. The pair of arc-shaped mesh plates 3 are exactly located in the hose 21 and are arranged close to the inner wall of the hose 21. The lengths of the arc-shaped mesh plates 3 and the hose 21 are equal. The plurality of supporting components 6 are used to support the pair of arc-shaped mesh plates 3 so that the arc-shaped mesh plates 3 are arranged close to the inner wall of the hose 21. The plurality of arc-shaped blocks 34 are used to press out an arc on the hose 21 to tighten the reinforcing mechanism. The plurality of arc-shaped blocks 34 are exactly located at the two end positions of the plurality of supporting components 6 in a one-to-one correspondence.

[0040] The support assembly 6 includes a support column 61, which has a hollow structure 62 inside and through holes penetrating into the hollow structure 62 are arranged at the centers of both ends of the support column 61. Two T-shaped driving columns 67 are slidably arranged in the through holes at both ends of the support column 61. The bottom ends of the two driving columns 67 are relatively fixed inside a pair of arc-shaped mesh plates 3, and the ends are slidably fitted on the inner wall of the internal hollow structure 62 of the support column 61. A connecting sleeve is also arranged on the inner wall of the internal hollow structure 62 of the support column 61, and a pair of threaded sleeves 64 are fixedly arranged inside the connecting sleeve. Springs 65 are arranged between the ends of the pair of threaded sleeves 64 and the ends of the two driving columns 67.

[0041] In another technical solution, the threaded sleeve 64 has an internal threaded channel, and a pair of rotating rods 63 are also arranged in the internal hollow structure 62 of the support column 61, and the two ends of the rotating rods 63 are respectively fixedly connected to the rotating parts 66 rotatably arranged at the two ends of the support column 61, and the rotating rods 63 are correspondingly freely passed through a pair of springs 65, two driving columns 67 and the internal threaded channel inside the threaded sleeve 64, and the outer wall of the rotating rod 63 is correspondingly provided with external threads 68 to match the internal threaded channel. The pair of rotating rods 63 is used to limit the moving direction of the compression and rebound of the driving column 67 and the spring 65, and at the same time, by driving the rotating part 66 to rotate, the rotating rod 63 is driven to rotate, thereby adjusting the position of the threaded sleeve 64, and then adjusting the elastic force of the springs 65 on both sides. The sliding of the threaded sleeve 64 prevents the threaded sleeve 64 from rotating when the rotating rod 63 rotates, so that the threaded sleeve 64 can no longer move on the rotating rod 63.

[0042] In another technical solution, at least two connection mechanisms 4 are further provided inside the pair of curved mesh panels 3, and the connection mechanisms 4 include a pair of connection members relatively provided on the inner walls of the pair of curved mesh panels 3, and the connection members include an L-shaped connection rod 41, a connection block 43 fixedly provided at the inner end of the connection rod 41, and a hook 42 rotatably provided on the connection block 43, and the outer end of the connection rod 41 is fixedly provided on the curved mesh panel 3. The connection rod 41 of the L-shaped structure is convenient for pressing, and is convenient for the auxiliary hook 42 to connect.

[0043] In another technical solution, in step one, after the hose 21 is set, before step two is performed, it also includes: first, squeezing a pair of arc-shaped mesh plates 3 so that the pair of arc-shaped mesh plates 3 are close to each other until the hooks 42 of the plurality of connecting mechanisms 4 are hooked one by one, thereby connecting and fixing the pair of arc-shaped mesh plates 3 close to each other, and at this time, the springs 65 corresponding to the support assembly 6 are all compressed; secondly, inserting the fixed pair of arc-shaped mesh plates 3 into the hose 21, aligning the two ends; thirdly, separating the hooks 42 that are hung, and under the elastic force of the springs 65, the arc-shaped blocks 34 of the pair of arc-shaped mesh plates 3 squeeze the hose 21 to form an arc, and the pair of arc-shaped mesh plates are tightly fixed to the inside of the hose 21; at this time, the inside of the hose 21 can be plugged with a sealing plug, and then removed when cooling and passing water;

[0044] In the step 4, the method of taking the reinforcing mechanism out of the hose 21 is: squeezing a pair of arc-shaped mesh plates 3 and then pulling them out of the hose 21 .

[0045] The mesh holes in the arc-shaped mesh plate 3 facilitate water flow to pass through the hose 21 to exchange heat with the mass concrete 1, thereby reducing the temperature difference between the inside and outside of the mass concrete 1. Components such as the spring 65 and the drive column 67 can support the hose 21 and the inside of the mass concrete 1, which can not only provide space for the mass concrete 1 to expand due to heat, but also strengthen the inside of the mass concrete 1.

[0046] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation mode, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, other modifications can be easily implemented, so without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A method for controlling cracking of unreinforced mass concrete, characterized in that: The steps include: Step 1: According to the set position requirements, multiple hoses are arranged at corresponding positions, which are arranged in intervals from top to bottom, and a reinforcing mechanism is correspondingly arranged in each hose to support the hose; Step 2: high-strength thermal conductive fibers are mixed into concrete, and the concrete mixed with high-strength thermal conductive fibers is used to cast large-volume concrete, and the hose is pre-buried in the large-volume concrete during the casting process; Step 3: During the solidification and forming of the large-volume concrete to form the unreinforced large-volume concrete, cold water is introduced into the hose to assist in cooling the concrete; Step 4: After the unreinforced mass concrete is formed, the reinforcing mechanism is removed from the hose, and the hose is sealed and filled with fillers; The reinforcing mechanism comprises a pair of arc-shaped mesh plates arranged opposite to each other, a plurality of supporting components arranged between the pair of arc-shaped mesh plates, and a plurality of arc-shaped blocks arranged outside the arc-shaped mesh plates. The pair of arc-shaped mesh plates are just located in the hose and are arranged close to the inner wall of the hose. The length of the arc-shaped mesh plates is equal to that of the hose. The plurality of supporting components are used to support the pair of arc-shaped mesh plates so that the arc-shaped mesh plates are arranged close to the inner wall of the hose. The plurality of arc-shaped blocks are used to press out an arc on the hose to tighten the reinforcing mechanism. The support assembly includes a support column, which has a hollow structure inside and through holes penetrating the hollow structure are arranged at the centers of both ends of the support column, two T-shaped driving columns are respectively arranged in the through holes at both ends of the support column for sliding cooperation, the bottom ends of the two driving columns are respectively relatively fixed inside a pair of arc-shaped mesh plates, and the ends are respectively slidably matched on the inner wall of the internal hollow structure of the support column, and a connecting sleeve is also arranged on the inner wall of the internal hollow structure of the support column, and a pair of threaded sleeves are fixedly arranged inside the connecting sleeve, and springs are arranged between the ends of the pair of threaded sleeves and the ends of the two driving columns; At least two connecting mechanisms are also arranged inside a pair of curved mesh panels, and the connecting mechanisms include a pair of connecting parts arranged relatively to the inner walls of the pair of curved mesh panels, and the connecting parts include an L-shaped connecting rod, a connecting block fixedly arranged at the inner end of the connecting rod, and a hook rotatably arranged on the connecting block, and the outer end of the connecting rod is fixedly arranged on the curved mesh panel.

2. The method for controlling cracking of unreinforced mass concrete according to claim 1, characterized in that: The step one also includes setting a plurality of copper wires at corresponding positions according to the set position requirements, which are set parallel to the hose, the plurality of copper wires are set at intervals from top to bottom and in the same horizontal plane, and the plurality of copper wires are staggered in the horizontal and vertical directions.

3. The method for controlling cracking of unreinforced mass concrete according to claim 2, characterized in that: The spacing between the multiple hoses ranges from 4m to 8m, and the spacing between the copper wire closest to the hose and the corresponding hose ranges from 30cm to 60cm.

4. The method for controlling cracking of unreinforced mass concrete according to claim 1, characterized in that: The usage of high-strength thermal conductive fiber is between 0.6kg / m³ and 1.8kg / m³, and the high-strength thermal conductive fiber is carbon fiber.

5. The method for controlling cracking of unreinforced mass concrete according to claim 1, characterized in that: The arc blocks are located at two end positions of the plurality of support components in a one-to-one correspondence.

6. The method for controlling cracking of unreinforced mass concrete according to claim 1, characterized in that: The threaded sleeve has an internal threaded channel, and a pair of rotating rods are also arranged in the internal hollow structure of the support column, and the two ends of the rotating rods are respectively fixedly connected to the rotating parts rotatably arranged at the two ends of the support column. The rotating rods can freely pass through a pair of springs, two driving columns and the internal threaded channel inside the threaded sleeve, and the outer wall of the rotating rod is provided with external threads to match the internal threaded channel.

7. The method for controlling cracking of unreinforced mass concrete according to claim 1, characterized in that: In step 1, after the hose is set, before step 2, it also includes: first, squeezing a pair of arc-shaped mesh plates so that the pair of arc-shaped mesh plates are close to each other until the hooks of the multiple connection mechanisms are hooked one by one, thereby connecting and fixing the pair of arc-shaped mesh plates close to each other, and at this time, the springs corresponding to the support components are all compressed; secondly, inserting the fixed pair of arc-shaped mesh plates into the hose, aligning the two ends; thirdly, separating the hooks, and under the elastic force of the springs, the arc blocks of the pair of arc-shaped mesh plates squeeze the hose to form an arc, and the pair of arc-shaped mesh plates are tightly fixed to the inside of the hose; In the step 4, the method for taking the reinforcing mechanism out of the hose is: squeezing a pair of arc-shaped mesh plates and then pulling them out of the hose.

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