Crack prevention structure for continuous cooling of concrete
The flexible constraint system formed by the combination of spiral core and sleeve components with reinforcing ribs and support rings solves the internal stress problem caused by rigid constraints in the prior art, effectively prevents concrete shrinkage deformation, prevents crack formation, and improves the overall performance of concrete.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI CONSTR ENG NINTH CONSTR GRP CO LTD
- Filing Date
- 2026-06-08
- Publication Date
- 2026-07-14
AI Technical Summary
Existing concrete crack prevention structures, under rigid constraints, are prone to excessive internal stress or cannot provide sufficient displacement compensation, thus failing to effectively prevent the formation of temperature shrinkage cracks.
The prevention and control component adopts a combination of spiral core and sleeve, which, together with reinforcing ribs and support rings, forms a flexible constraint. Through conical sliding fit and double-layer circumferential constraint system, it achieves flexible adjustment and rigid force transmission of concrete shrinkage deformation, thus preventing the formation of cracks.
It effectively avoids excessive tensile stress caused by rigid constraints, significantly delays or prevents the formation of radial cracks, achieves comprehensive prevention and control of axial and radial cracks in concrete, and maintains the load-bearing capacity and impermeability of concrete.
Smart Images
Figure CN224495591U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of concrete crack prevention technology, and more specifically, to a crack prevention structure for continuous cooling of concrete. Background Technology
[0002] After the concrete structure is poured, the internal temperature rises rapidly due to the heat released by cement hydration, and then gradually cools down to the ambient temperature. When it encounters continuous cooling (such as cold waves, large temperature differences between day and night, winter construction, or the later stage of heat dissipation of large-volume concrete), the concrete will shrink and deform. Since the tensile strength of concrete is much lower than its compressive strength, when the tensile stress exceeds its limit, temperature shrinkage cracks will occur. Therefore, it is necessary to take necessary measures to prevent the concrete from developing harmful cracks.
[0003] Due to the construction process and inherent structural issues of concrete, some micro-cracks are unavoidable. These micro-cracks, influenced by factors such as temperature, can develop into harmful cracks. Harmful cracks reduce the load-bearing capacity and impermeability of concrete materials; therefore, necessary measures must be taken to prevent the formation of harmful cracks in concrete.
[0004] A search revealed a concrete crack prevention structure disclosed in Chinese Patent No. CN222501139U. By setting up cooling pipes and supporting structures, it not only avoids cracks caused by excessively high concrete floor temperatures but also increases the tensile strength of the concrete floor.
[0005] However, in actual use, when the above-mentioned concrete crack prevention structure is used for crack prevention by rigid constraint, when the concrete shrinkage is small, the rigid constraint will generate large internal stress prematurely, causing micro-cracks to occur before the concrete has fully exerted its tensile strength. When the shrinkage is large, the rigid constraint cannot provide sufficient displacement compensation capacity, which can easily cause local damage between the constraint structure itself and the concrete. Utility Model Content
[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a crack prevention structure for continuous cooling of concrete to solve the problems mentioned in the background art.
[0007] To achieve the above objectives, this utility model provides the following technical solution: Crack prevention structures for continuous cooling of concrete include concrete fill and also: A prevention and control component is installed inside the concrete fill to restrain the shrinkage deformation of the concrete fill caused by cooling. The prevention and control component includes a steel rod, which is fixedly connected inside the concrete fill. Both ends of the steel rod penetrate the concrete fill and extend to the outside. Anchor plates are fixedly connected to both ends of the steel rod. A reinforcing mechanism, installed on the protection component, is used to provide effective support inside the concrete fill.
[0008] As a further description of the above technical solution: The steel bar has a helical core fixedly connected inside, and the helical core extends in a spiral shape along the axial direction of the steel bar.
[0009] As a further description of the above technical solution: The spiral reinforcement core includes an equidistant end located in the middle and variable diameter ends located at both ends. The spiral diameter of the variable diameter ends gradually changes along the axial direction, while the spiral diameter of the equidistant ends remains constant. Both variable diameter ends penetrate the concrete fill and extend to its outer side.
[0010] As a further description of the above technical solution: The prevention and control component also includes a sleeve, which is fixedly connected to the end of the variable diameter end. The sleeve has a sliding cavity inside, and the cross-section of the sliding cavity is conical. Its large conical surface faces the variable diameter end, and its small end face is away from the helical core. The conical structure can convert axial movement into radial compression, maintaining a long-term effective constraint effect.
[0011] As a further description of the above technical solution: The prevention and control component also includes a limiting block, which is fixedly connected to the outside of the steel bar. The outer contour of the limiting block is adapted to the inner side of the sliding cavity, and the limiting block is slidably connected to the inside of the sliding cavity. The sliding connection between the limiting block and the sliding cavity allows the steel bar to slide axially within a predetermined range relative to the sleeve during the continuous cooling of the concrete.
[0012] As a further description of the above technical solution: The reinforcing mechanism includes multiple reinforcing ribs fixedly connected to the outside of the steel bar. The interior of the multiple reinforcing ribs has a honeycomb structure, and multiple hollow units are formed inside the honeycomb structure of the reinforcing ribs, which significantly reduces the self-weight while maintaining high compressive and shear strength.
[0013] As a further description of the above technical solution: The reinforcing mechanism also includes a support ring, and the outer sides of the plurality of reinforcing ribs are fixedly connected to the support ring. The plurality of reinforcing ribs are evenly and symmetrically distributed along the axial direction of the steel bar. The support ring is used to support the outer sides of the reinforcing ribs to prevent the reinforcing ribs from buckling or expanding locally under the shrinkage pressure of concrete.
[0014] As a further description of the above technical solution: The outer side of the support ring is fixedly connected to the inner side of the spiral core, and is used to provide radial tension to the spiral core.
[0015] The technical effects and advantages of this utility model are as follows: 1. By setting up prevention and control components, compared with existing technologies, the conical sliding fit between the sleeve and the limiting block, together with the spiral core, transforms the axial force into circumferential compression, realizing the dual function of flexible adjustment and rigid force transmission. It can effectively avoid excessive tensile stress caused by rigid constraints, and at the same time, it can form a reliable limit after shrinkage exceeds the limit, thereby effectively restraining the shrinkage deformation of concrete caused by continuous cooling. 2. By setting up a reinforcing mechanism, compared with the existing technology, multiple reinforcing bars are connected into a cage-like structure through a support ring to prevent local buckling and outward expansion. It is also fixedly connected to the inner side of the spiral core, actively providing reverse radial tension to form a double-layer circumferential constraint system. This significantly delays or prevents the formation of radial cracks. It also works in synergy with the prevention and control components to achieve all-round prevention and control of axial and radial cracks in concrete. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0017] Figure 2 This is a schematic diagram of the spiral reinforcing bar core and the concrete filling structure of this utility model.
[0018] Figure 3 This is a schematic diagram of the steel bar connection structure of this utility model.
[0019] Figure 4 This is a schematic diagram of the support ring connection structure of this utility model.
[0020] Figure 5 This is a schematic diagram of the connection between the reinforcing rib and the steel rod of this utility model.
[0021] Figure 6 For the present utility model Figure 3 Enlarged view of the structure of part A in the middle.
[0022] The attached diagram is labeled as follows: 1. Concrete fill; 2. Steel bar; 3. Spiral reinforcement core; 4. Sleeve; 5. Sliding cavity; 6. Limiting block; 7. Anchor plate; 8. Support ring; 9. Reinforcing bar; 10. Equidistant end; 11. Variable diameter end. Detailed Implementation
[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0024] Example 1: The embodiments disclosed in this application are as follows: Figure 1-6 The concrete crack prevention structure with continuous cooling shown includes concrete fill 1, and also includes: The prevention and control component is installed inside the concrete fill 1 to restrain the shrinkage deformation of the concrete fill 1 caused by cooling. The prevention and control component includes a steel rod 2, which is fixedly connected inside the concrete fill 1. Both ends of the steel rod 2 penetrate the concrete fill 1 and extend to the outside. Anchor plates 7 are fixedly connected to both ends of the steel rod 2. A reinforcing mechanism, installed on the prevention and control components, is used to provide effective support inside the concrete fill 1; A spiral core 3 is fixedly connected inside the steel bar 2. The spiral core 3 extends spirally along the axial direction of the steel bar 2. The spiral core 3 includes an equidistant end 10 in the middle and variable diameter ends 11 at both ends. The spiral diameter of the variable diameter ends 11 gradually changes along the axial direction, while the spiral diameter of the equidistant ends 10 remains constant. Both variable diameter ends 11 penetrate the concrete fill 1 and extend to its outer side. The prevention and control component also includes a sleeve 4, which is fixedly connected to the ends of the variable diameter ends 11. A sliding cavity 5 is opened inside the sleeve 4, and the cross-section of the sliding cavity 5 is conical. The shape has a large conical surface facing the variable diameter end 11 and a small end face away from the spiral core 3. The conical structure can convert axial movement into radial compression, maintaining a long-term effective constraint effect. The prevention component also includes a limiting block 6, which is fixedly connected to the outside of the steel rod 2. The outer contour of the limiting block 6 is adapted to the inner side of the sliding cavity 5, and the limiting block 6 is slidably connected to the inside of the sliding cavity 5. The sliding connection between the limiting block 6 and the sliding cavity 5 allows the steel rod 2 to undergo axial sliding within a predetermined range relative to the sleeve 4 during the continuous cooling of the concrete.
[0025] The implementation principle of this embodiment is as follows: First, the steel rod 2 is fixed to the external support frame of the concrete fill 1 by two anchor plates 7 to keep the steel rod 2 stable. When the concrete continuously cools down, the concrete fill 1 undergoes overall shrinkage deformation. Since the spiral core 3 is wrapped inside the concrete fill 1 and its spiral shape has a large contact area with the concrete, the shrinkage of the concrete fill 1 will squeeze the spiral core 3 from the radial outside to the inside, causing it to have a tendency to radial compression and axial shortening. During this process, the variable diameter ends 11 at both ends of the spiral core 3 drive the sleeve 4 fixedly connected to it to slide axially on the steel rod 2. When the sleeve 4 slides, its internal conical sliding cavity 5 moves relative to the limiting block 6 fixed on the steel rod 2. When the amount of concrete shrinkage is small... The limiting block 6 slides freely within the large conical surface area of the sliding cavity 5 without generating rigid resistance, thus allowing the spiral core 3 and sleeve 4 to make minor adjustments following the concrete shrinkage. This avoids a sharp increase in internal tensile stress due to rigid constraints. When the concrete shrinkage exceeds the predetermined design value, the sleeve 4 continues to slide until the inner wall of the small end face of the sliding cavity 5 contacts and abuts against the limiting block 6. The conical structure converts the axial thrust into radial clamping force, thereby achieving reliable limiting and preventing further axial displacement of the sleeve 4 and spiral core 3. This further restricts the excessive shrinkage deformation of the concrete fill 1, achieving the dual function of flexible adjustment and rigid force transmission. It can effectively avoid excessive tensile stress caused by rigid constraints, thus effectively restraining the shrinkage deformation of concrete caused by continuous cooling.
[0026] Example 2: Based on Example 1, this example discloses a crack prevention structure for continuous cooling of concrete, referring to... Figure 4 As shown, the reinforcing mechanism includes multiple reinforcing ribs 9 fixedly connected to the outside of the steel bar 2. The inside of the multiple reinforcing ribs 9 has a honeycomb structure, and multiple hollow units are formed inside the honeycomb structure of the reinforcing ribs 9. The self-weight is significantly reduced while maintaining high compressive and shear strength. The reinforcing mechanism also includes a support ring 8. The outside of the multiple reinforcing ribs 9 is fixedly connected to the support ring 8. The multiple reinforcing ribs 9 are evenly and symmetrically distributed along the axial direction of the steel bar 2. The support ring 8 is used to support the outside of the reinforcing ribs 9 to prevent the reinforcing ribs 9 from buckling or bulging locally under the shrinkage pressure of concrete. The outside of the support ring 8 is fixedly connected to the inside of the spiral core 3 to provide radial tension to the spiral core 3. The implementation principle of this embodiment is as follows: During the continuous cooling process of concrete, the concrete fill 1 not only undergoes axial shrinkage but also radial shrinkage. Multiple hollow units are formed inside the honeycomb structure of the reinforcing bar 9. These hollow units are filled with grout during concrete pouring, thereby significantly enhancing the bond between the reinforcing bar 9 and the concrete fill 1. When radial shrinkage occurs, the reinforcing bar 9 provides uniform compressive and shear support due to its honeycomb structure, preventing local buckling. The support ring connects multiple reinforcing bars into a cage-like structure, forming a closed-loop support in the radial direction, preventing the reinforcing bar 9 from bulging outward under shrinkage pressure. The outer side of the support ring 8 is fixedly connected to the inner side of the spiral core 3. When the spiral core 3 tends to shrink inward due to the radial shrinkage of the concrete, the support ring 8 applies a reverse radial tensile force to the spiral core 3, forming a double-layer circumferential constraint system, thereby achieving all-round prevention and control of axial and radial cracks in the concrete.
[0027] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A crack prevention structure for continuous cooling of concrete, including concrete fill (1), characterized in that: Also includes: The prevention and control component is installed inside the concrete fill (1) to restrain the shrinkage deformation of the concrete fill (1) caused by cooling. The prevention and control component includes a steel rod (2), which is fixedly connected inside the concrete fill (1). Both ends of the steel rod (2) penetrate the concrete fill (1) and extend to the outside. Anchor plates (7) are fixedly connected to both ends of the steel rod (2). A reinforcement mechanism, installed on the prevention and control component, is used to provide effective support inside the concrete fill (1).
2. The crack prevention structure for continuous cooling of concrete according to claim 1, characterized in that: The steel rod (2) is fixedly connected to a spiral core (3), which extends spirally along the axial direction of the steel rod (2).
3. The crack prevention structure for continuous cooling of concrete according to claim 2, characterized in that: The spiral core (3) includes an equidistant end (10) in the middle and variable diameter ends (11) at both ends. The spiral diameter of the variable diameter end (11) gradually changes along the axial direction, while the spiral diameter of the equidistant end (10) remains constant. Both variable diameter ends (11) penetrate the concrete fill (1) and extend to its outer side.
4. The crack prevention structure for continuous cooling of concrete according to claim 3, characterized in that: The prevention and control component also includes a sleeve (4), which is fixedly connected to the end of the variable diameter end (11). The sleeve (4) has a sliding cavity (5) inside, and the cross-section of the sliding cavity (5) is conical, with its large conical surface facing the variable diameter end (11) and its small end face away from the spiral core (3).
5. The crack prevention structure for continuous cooling of concrete according to claim 4, characterized in that: The prevention and control component also includes a limiting block (6), which is fixedly connected to the outside of the steel rod (2). The outer contour of the limiting block (6) is adapted to the inner side of the sliding cavity (5), and the limiting block (6) is slidably connected to the inside of the sliding cavity (5).
6. The crack prevention structure for continuous cooling of concrete according to claim 2, characterized in that: The reinforcing mechanism includes multiple reinforcing ribs (9) fixedly connected to the outside of the steel rod (2), and the interior of the multiple reinforcing ribs (9) has a honeycomb structure.
7. The crack prevention structure for continuous cooling of concrete according to claim 6, characterized in that: The strengthening mechanism also includes a support ring (8), and the outer sides of the plurality of reinforcing ribs (9) are fixedly connected to the support ring (8). The plurality of reinforcing ribs (9) are evenly and symmetrically distributed along the axial direction of the steel bar (2). The support ring (8) is used to support the outer sides of the reinforcing ribs (9).
8. The crack prevention structure for continuous cooling of concrete according to claim 7, characterized in that: The outer side of the support ring (8) is fixedly connected to the inner side of the spiral core (3) to provide radial tension to the spiral core (3).