A large volume concrete cooling system using welded hollow steel pipe as reinforcement cage

Abstract

The utility model relates to a kind of welding type hollow steel pipe, including circulating cooling water tank, it further includes: several condensing steel pipes, its inside is hollow structure;Several connecting joints for connecting condensing steel pipe, connecting joint includes T joint, cross joint and reducing tee joint;Condensing steel pipe is connected between through connecting joint, forms the reinforcement cage with grid structure;Reinforcement cage has the hollow passage through inside, and the hollow passage constitutes cooling water circulation flow channel;Circulating cooling water tank and the hollow passage of condensing steel pipe are connected by pipeline and communicate, the utility model optimizes the interior space of reinforcement cage, improves the utilization efficiency of structure interior space.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, specifically to a large-volume concrete cooling system that uses a welded hollow steel pipe as a reinforcing cage. Background Technology

[0002] During the pouring and curing stages of large-volume concrete, cement hydration releases a significant amount of heat, which accumulates in the concrete core. This heat is difficult to dissipate quickly through heat transfer, leading to a significant increase in the internal temperature of the concrete, typically reaching 60-80℃, and sometimes even exceeding 90℃. The concrete surface dissipates heat relatively quickly, creating a significant temperature difference between the inside and outside. This causes compressive stress inside the concrete and tensile stress on the outside. Since concrete has a low early elastic modulus and tensile strength, it is highly susceptible to surface cracking. During the cooling period, the internal temperature of the concrete decreases, causing shrinkage deformation. Under the influence of the foundation or other constraints, internal cracks may also occur, severely impacting the safety and durability of the engineering structure. Therefore, effectively controlling the heat of hydration and reducing the temperature difference between the inside and outside of concrete is a key technology for preventing cracking in large-volume concrete.

[0003] In the engineering field, water cooling technology is the mainstream method for controlling temperature cracks in large-volume concrete. The traditional approach is to pre-embed pipes inside the concrete and pass cooling water through them to reduce the internal temperature through heat exchange. However, existing water cooling technologies have several shortcomings that urgently need to be addressed: First, traditional pre-embedded pipes (such as PVC condensing plastic pipes) only have a single cooling function and cannot enhance the strength of the concrete structure, making them functionally redundant components. Second, traditional cooling systems require multiple independent circulating cooling water pipes to be arranged within the concrete. Injecting cooling water into each pipe not only results in low water injection efficiency but also easily leads to uneven temperature distribution within the concrete, affecting temperature control. Third, flexible plastic pipes need to be additionally tied and fixed to the reinforcing steel frame, which not only interferes with the pre-set reinforcing steel structure and positioning but also increases the complexity of the construction process and reduces construction efficiency. Fourth, there is a contradiction in the disposal of cooling water. If it is directly discharged into municipal pipelines, although the inlet water temperature can be kept constant, it results in a serious waste of water resources. If simple recycling is adopted, the temperature of the cooling water will rise after absorbing heat, which will significantly reduce the subsequent cooling efficiency, making it difficult to achieve both cooling effect and water conservation.

[0004] To address some of the aforementioned issues, a concrete water circulation cooling system has emerged in the prior art. This system utilizes multiple sets of cooling water channels spaced within the concrete, all connected to a single inlet and outlet pipe. This allows for simultaneous water injection through multiple channels, improving injection efficiency and optimizing temperature uniformity to some extent. Furthermore, positioning the inlet pipe in the center of the concrete allows for targeted cooling of core heat-generating areas. The system also features a support frame composed of vertical and horizontal support pipes to secure the cooling water channels and prevent pipe deformation and displacement. Ball valves, water pumps, and control devices enable control and actuation of the water flow. However, this system still has significant limitations: the cooling water channels and the support frame are independent components; the support frame only serves to fix the pipes and is not integrated with the structural load-bearing requirements of the concrete, failing to achieve a unified structural support and cooling function. Moreover, the system lacks an optimized solution for efficient heat dissipation and recycling of the heated cooling water, resulting in water waste or insufficient circulation cooling efficiency. Additionally, the assembly of the pipes and support frame requires extra construction steps, failing to fundamentally simplify the construction process or avoid interference with the reinforcing steel structure.

[0005] Therefore, how to innovate a large-volume concrete cooling system that combines structural support and cooling functions, has high water injection efficiency and uniform temperature control, is easy to construct, and has good water resource recycling effect, namely, to develop a large-volume concrete cooling system that uses welded hollow steel pipes as reinforcement cages, combining the cooling system and the structural support system into one, and solving the contradiction between water resource recycling and efficient heat dissipation, has become an important issue that urgently needs to be addressed in the current engineering technology field. Utility Model Content

[0006] The purpose of this invention is to overcome the above-mentioned existing problems.

[0007] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is as follows: Design a large-volume concrete cooling system using welded hollow steel pipes that also serve as reinforcing cages. The specific scheme is as follows: A large-volume concrete cooling system using welded hollow steel pipes that also function as reinforcing cages, comprising a circulating cooling water tank, and further comprising: Several condensing steel pipes, the interior of which is hollow; Several connecting fittings for connecting condensing steel pipes, including T-type fittings, cross-type fittings and reducing tee fittings; The condensing steel pipes are connected by connecting joints to form a steel cage with a grid-like structure; The steel cage has a through hollow channel inside, which forms a cooling water circulation channel. The circulating cooling water tank and the hollow channel of the condensing steel pipe are connected by a pipeline.

[0008] Furthermore, the circulating cooling water tank includes an upper return water tank, a middle cooling tank, and a lower water supply tank connected sequentially from top to bottom; A water pump is installed in the lower water tank; The upper return water tank and the lower supply water tank are respectively equipped with interfaces for connecting pipes on their side walls.

[0009] Furthermore, the middle cooling box has a pull-out drawer-type structure, and its bottom has a sieve plate structure with sieve holes.

[0010] Furthermore, the outer wall of the connector is provided with radially extending reinforcing ribs.

[0011] Furthermore, the outer wall of the condenser steel pipe is provided with spiral-shaped raised ribs.

[0012] The beneficial effects of this utility model are: 1. The reinforcing cage of the supporting structure and the cooling water pipe network for heat dissipation are combined into a single structure. Specifically, the hollow internal channels of the condensing steel pipes, which are the main load-bearing components, are directly used as cooling water channels. This design avoids the need for additional binding or laying of a large number of cooling water pipes within the reinforcing cage, reducing material usage and procedures, thereby shortening the construction period. Simultaneously, the integrated structure eliminates potential installation conflicts between the cooling water pipes and the reinforcing steel, optimizes the internal space of the reinforcing cage, and improves the utilization efficiency of the internal space of the structure.

[0013] 2. The three-layer modular water tank structure integrates and separates the functions of cooling water collection, cooling, and transportation. The middle cooling tank with a drawer-type sieve plate structure facilitates the replenishment and replacement of ice. Utilizing the heat absorption of melting ice is a simple, direct, and low-cost cooling method that meets the requirements of economic efficiency and practicality on construction sites and can provide stable cooling capacity for the cooling water circulation within the integrated steel cage.

[0014] 3. Standardized joints such as T-type, cross-type, and reducing tee types provide multi-angle connection nodes for the condensing steel pipes. This allows the supports composed of straight steel pipes to be flexibly assembled into three-dimensional grid structures of different sizes and shapes (such as those adaptable to foundation raft slabs and bridge piers), exhibiting high design adaptability and on-site adjustability. Simultaneously, the reinforcing ribs on the outer wall of the joints significantly enhance the local strength and stiffness of the node area, ensuring that the welded nodes and steel pipe members have similar mechanical properties. This guarantees the overall stability and reliability of the integrated structure, which also serves as a reinforcing cage, under the loads of concrete pouring and service loads. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of a large-volume concrete cooling system that uses a welded hollow steel pipe as a reinforcing cage, as proposed in this utility model. Figure 2This is a schematic diagram of the structure of the middle cooling tank of the movable circulating water cooling tank in this utility model; Figure 3 This is a schematic diagram of the hollow condenser steel pipe of this utility model; Figure 4 This is a schematic diagram of a T-type connector structure; Figure 5 This is a schematic diagram of a cross-shaped connector structure; Figure 6 This is a schematic diagram of a reducing tee type connector. Figure 7 A schematic diagram of a wireless temperature acquisition module for an existing cooling system; Figure 8 A schematic diagram of the actual layout of cooling water pipes used in the construction of the foundation.

[0016] The above figures include the following reference numerals: 1. Upper return water tank; 2. Middle cooling tank; 3. Lower water supply tank; 4. Power supply socket; 5. Pulley; 6. Water supply pipe; 7. Return water pipe; 8. T-type connector; 9. Cross-type connector; 10. Condensate steel pipe; 11. Reducing tee connector. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments, not all embodiments.

[0018] In the description of this utility model, it should be understood that the terms "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] refer to Figure 1-8 This invention provides a large-volume concrete cooling system using welded hollow steel pipes that also function as reinforcing cages. The system includes a cooling water tank, condensing steel pipes 10, and connecting joints. The condensing steel pipes 10 are interconnected via the connecting joints to form a mesh-like reinforcing cage that serves as the structural support framework. Simultaneously, the internal hollow channels of the condensing steel pipes 10 are interconnected, forming a cooling water circulation channel embedded within the concrete. The cooling water tank is connected to the inlet and outlet of this cooling water circulation channel via pipes, forming a complete cooling water circulation loop, thus integrating cooling and structural load-bearing functions.

[0020] Preferably, the cooling water tank adopts a three-layer modular design, namely an upper return water tank 1, a middle cooling tank 2 and a lower water supply tank 3, with 4 sets of hinged movable pulleys 5 at the bottom. The overall dimensions are designed according to the required cooling water flow rate of the project.

[0021] Preferably, the upper return water tank 1 is located at the top of the water tank, and its side wall is provided with multiple interfaces. In the top area of ​​the mesh reinforcement cage, preferably about 0.5-1.0m behind the highest point of each cooling circuit, an outflow cut (i.e., a return water inlet) is made. The interfaces of the upper return water tank 1 are sealed to these outflow cuts through flexible, pressure-resistant return water pipes. The upper return water tank 1 integrates a negative pressure suction device linked to a built-in water pump, which can draw the heated cooling water that has completed heat exchange from the cooling water circulation channel of the reinforcement cage to the upper return water tank 1, ensuring that the water flow can completely flow into the middle cooling tank 2 for cooling treatment.

[0022] Preferably, the middle cooling tank 2 is a cooling water cooling component, and adopts a drawer-type structure design that is connected to the main body of the water tank via a slide rail, which makes it easy for operators to replace the built-in cooling medium; the bottom is evenly provided with holes to form a sieve plate structure, so that the cooling water flowing into the upper return water tank 1 can be evenly dispersed and fall.

[0023] Preferably, industrial ice is placed inside the box as the direct cooling medium. The amount of ice used is determined according to the cooling water flow rate and cooling requirements. Typically, 50-100 kg of ice needs to be added per hour to achieve the desired cooling effect.

[0024] Preferably, the lower water tank 3 is located at the bottom of the main water tank and integrates two ISG50-160 centrifugal water pumps. The two pumps are connected in parallel to achieve one in use and one as a backup, improving system reliability. The lower water tank 3 also has multiple interfaces on its side wall. In the bottom area of ​​the mesh reinforcement cage, preferably at the beginning of each cooling circuit (i.e., the lowest point), a water inlet (i.e., a water supply port) is opened. The interfaces of the lower water tank 3 are sealed to these water inlets through flexible pressure-resistant water pipes. The water pumps in the lower water tank 3 can pump the cooled water into the water inlets at the bottom of the reinforcement cage, allowing the cooling water to circulate from bottom to top in the flow channels inside the reinforcement cage.

[0025] The hinged pulleys 5 at the four corners of the bottom of the water tank are made of high-strength nylon material, allowing the pulleys to rotate 360° in the horizontal direction, which facilitates the flexible movement of the water tank on the construction site. They are especially suitable for cooling needs in different locations in large concrete pouring areas. A braking device is installed on the outside of the pulley, which can lock the pulley after the water tank is moved to the designated position to prevent displacement during construction.

[0026] In a preferred embodiment of this utility model, to achieve automatic control and monitoring functions, the cooling box 2 can be integrated with a control system. This control system may include, for example, a programmable logic controller (PLC), a temperature sensor, and a water flow sensor. The PLC can receive signals from the sensors and control the start, stop, and speed of the water pump according to a preset program, while simultaneously transmitting data such as operating status and water temperature to a host computer or user interface.

[0027] It should be noted that the aforementioned PLC control system and its connection and control logic with sensors and actuators are existing technologies commonly used in building automation, building equipment monitoring, and other scenarios. Using such a system to achieve automatic monitoring of the cooling box 2 of this invention is obvious to those skilled in the art and requires no inventive effort.

[0028] Preferably, the condenser steel pipe 10 is made of Q355B low-alloy high-strength steel with good weldability and mechanical properties. Its specifications are flexibly designed according to the actual engineering requirements. Preferably, for projects with concrete structures such as high-rise building foundation raft slabs with a height of 1.5-3.0m, steel pipes with an outer diameter of 80-100mm, a wall thickness of 5-8mm, and a single length of 2-6m are usually selected; for projects with concrete structures such as bridge piers and abutments with a height of 3.0-87m, steel pipes with an outer diameter of 100-150mm, a wall thickness of 87-12mm, and a single length of 3-87m are selected; for projects with concrete structures such as large equipment foundations with a height of 2.0-5.0m, steel pipes with an outer diameter of 80-120mm, a wall thickness of 6-10mm, and a single length of 2-5m are selected. Preferably, the inner wall of the condensing steel pipe 10 can be galvanized to prevent long-term erosion and corrosion by cooling water, and the outer wall is provided with spiral ribs with a height of 3-5mm and a spacing of 50-87mm to enhance the bonding force between the steel pipe and the concrete and improve the overall structural performance. Preferably, both ends of the steel pipe are processed with 30° welding bevels to facilitate welding connection with the connecting joint and ensure the sealing and strength of the connection.

[0029] Preferably, the connecting joints include three different types: "T-type", "cross-type", and "reducing tee type", all forged from the same material as the condensing steel pipe 10 to ensure the welding compatibility and mechanical performance consistency between the joint and the steel pipe. Preferably, the ends of the connecting joints are all machined with a 30° welding bevel. The T-type joint 8 is formed by vertically welding the main pipe and the branch pipe. The two ends of the main pipe are connected to the condensing steel pipe 10, and the branch pipe is perpendicular to the middle of the main pipe to form a "T" shape structure. The specific size is determined according to the outer diameter of the connecting steel pipe. It is mainly used for in-plane branch connection of the reinforcing cage structure. For example, in the raft foundation concrete, the steel pipe can be connected laterally through the T-type joint 8 on the longitudinal steel pipe to realize the vertical pipeline extension and form an in-plane mesh support structure. The cross-shaped joint 9 is formed by welding four steel pipes of equal diameter perpendicularly to each other in the same plane to form a cross-shaped structure. The inner diameter, wall thickness and end bevel of each branch pipe are consistent with the connected condensing steel pipe 10. It is mainly used for node connection of steel cage structure, and can realize the connection of steel pipes in four directions to form the node core of spatial network structure. It is suitable for areas with large stress in concrete structure, such as the bottom reinforcement area of ​​bridge piers.

[0030] The tee-type joint 11 consists of a main pipe and branch pipes, and is mainly used for connection between different layers of a reinforced cage structure, or in situations where space is limited in the edge area of ​​a structure, such as the edge of a raft foundation slab in a high-rise building. All three types of joints have reinforcing ribs on their outer walls. Preferably, the T-type joint 8 has 3 reinforcing ribs, the cross-type joint 9 has 4 reinforcing ribs, and the tee-type joint 11 has 3 reinforcing ribs. The reinforcing ribs are 7-10 mm high and 5-6 mm thick, and are evenly distributed along the circumference of the joint to further improve its load-bearing capacity and deformation resistance.

[0031] The assembly and construction process of a large-volume concrete cooling system that uses welded hollow steel pipes as reinforcing cages needs to be combined with the construction process of concrete structures. The specific installation and usage process is as follows: Before construction, the structural dimensions, number of layers, steel pipe specifications and joint types of the hollow condensing steel cage need to be determined according to the design drawings of the concrete structure. On-site measurement and marking of the installation position and elevation of the steel cage should be carried out, and the quality of the condensing steel pipe 10 and the connection joint should be checked.

[0032] The assembly and welding of hollow condensing steel cages is carried out in layers and then welded as a whole, according to the height and shape of the concrete structure. The bottom layer of condensing steel pipes 10 is laid on the construction foundation according to the dimensions in the design drawings. Cross-shaped joints 9 are used as nodes for the bottom frame. The longitudinal and transverse steel pipes are connected into a grid shape by manual arc welding. After the bottom frame welding is completed and passes inspection, vertical steel pipes are connected to the bottom frame using T-shaped joints 8 or tee joints 11, according to the height of the concrete structure. The spacing of the vertical steel pipes is consistent with the grid spacing of the bottom frame, and the height of the vertical steel pipes is the floor height of each frame layer. The middle layer of transverse steel pipes is connected to the top of the vertical steel pipes to form the middle frame. The grid size of the middle frame is the same as that of the bottom frame to ensure the integrity of the steel cage structure. The upper frame is assembled upwards according to the assembly method of the middle frame until the design height of the concrete structure is reached. A cut is reserved at the top of the upper frame for connection to the cooling water tank. The number of cuts is determined according to the design of the cooling water circuit; typically, each circuit has one inlet cut and one outlet cut.

[0033] Temperature sensors of model PT100 platinum resistance thermometers are evenly installed along the floor height on each layer of the steel cage frame. The measurement range is -50℃ to 200℃. They are arranged in the core and outer layers of concrete respectively. The core sensor is located at the center of the steel cage grid, and the outer layer sensor is located near the concrete surface of the steel cage. The sensors are connected to the PLC control system of the cooling water tank through waterproof cables to realize real-time temperature monitoring (the above temperature monitoring system, such as the arrangement of measuring points, data acquisition and transmission scheme, are all mature structures widely used on current construction sites).

[0034] Taking a high-rise building foundation raft slab project as an example, the raft slab has dimensions of 20m×15m×2.5m. The condensing steel cage structure of this utility model is designed as a 3-layer frame with a floor height of 1.0m. The bottom and middle layers of the frame use condensing steel pipes 10 with an outer diameter of 100mm and a wall thickness of 8mm, while the upper layer of the frame uses condensing steel pipes 10 with an outer diameter of 80mm and a wall thickness of 6mm. Cross-shaped joints are used at the nodes, and T-type joints 11 are used for inter-layer connections. The grid spacing is 2.0m.

[0035] After the cooling water tank is moved into place, the pulley braking device is used to fix the tank. Cooling water is injected into the tank until it reaches 2 / 3 of the volume of the lower water tank 3. Then, the PLC control system is started to check the operating status of the water pump, negative pressure suction device, and other equipment. During pipeline connection and system debugging, water pipe 6 is used to connect the interface of the lower water tank 3 to the lower water inlet of the condensate reinforcement cage, and the interface of the upper return water tank 1 to the upper water outlet of the condensate reinforcement cage. The connection between the water pipe and the inlet is tightened with hose clamps and sealant is applied to ensure a leak-proof seal.

[0036] After the system is successfully debugged, large-volume concrete pouring is carried out. During the pouring process, the cooling water circulation system is kept running continuously. The temperature changes of the concrete core and outer layer are monitored in real time through the PLC control system. When the temperature difference between the concrete core and the outer layer exceeds 25°C, the amount of ice in the middle cooling box is increased to improve the cooling effect of the cooling water. When the temperature difference is less than 20°C, the amount of ice is appropriately reduced to avoid excessive cooling and cracking of the concrete. After the pouring is completed, the cooling system continues to run until the temperature of the concrete core drops to within 5°C above the ambient temperature. The cooling time is usually 7-14 days, depending on the concrete strength grade and the ambient temperature. After the concrete has cooled down, the cooling system is shut down and the water pipes connected to the cooling water tank are removed. Then, a high-strength cementitious material with good fluidity is injected into the hollow steel pipe. The cementitious material is C80 self-compacting concrete, with an appropriate amount of expansion agent added to ensure that the cementitious material fills the gaps tightly. Grouting is carried out from bottom to top through the lower double water supply pipe 6 arrangement structure until the cementitious material overflows from the cut of the upper steel pipe, so that the high-strength cementitious material, hollow steel pipe and concrete structure form an integral whole, further enhancing the load-bearing capacity and durability of the structure.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A large-volume concrete cooling system using welded hollow steel pipes as reinforcing cages, comprising a circulating cooling water tank, characterized in that, Also includes: Several condensing steel pipes, the interior of which is hollow; Several connecting joints for connecting condensing steel pipes, including T-type joints (9), cross-type joints (9) and reducing tee type joints (11). The condensing steel pipes are connected by connecting joints to form a steel cage with a grid-like structure; The steel cage has a through hollow channel inside, which forms a cooling water circulation channel. The circulating cooling water tank and the hollow channel of the condensing steel pipe are connected by a pipeline.

2. The large-volume concrete cooling system using welded hollow steel pipes as reinforcing cages according to claim 1, characterized in that, The circulating cooling water tank includes an upper return water tank (1), a middle cooling tank (2) and a lower water supply tank (3) connected from top to bottom. A water pump is installed in the lower water tank (3); The upper return water tank (1) and the lower water supply tank (3) are respectively provided with interfaces for connecting pipes on their side walls.

3. The large-volume concrete cooling system using welded hollow steel pipes as reinforcing cages according to claim 2, characterized in that, The middle cooling box (2) is a pull-out drawer-type structure with a sieve plate structure with sieve holes at the bottom.

4. The large-volume concrete cooling system using welded hollow steel pipes as reinforcing cages according to claim 1, characterized in that, The outer wall of the connector is provided with radially extending reinforcing ribs.

5. A large-volume concrete cooling system using welded hollow steel pipes as reinforcing cages according to claim 4, characterized in that, The outer wall of the condenser steel pipe is provided with spiral raised ribs.

Images