Mass concrete cooling screw construction method

Abstract

The invention discloses a mass concrete cooling screw construction method. The mass concrete cooling screw construction method specifically comprises the following steps that firstly, a cooling screw is arranged and installed; step 2, water passing connection of a cooling screw rod; step 3, temperature measuring element installation; step 4, temperature control; the cooling screw is adopted to replace an opposite-pull screw, a condensation pipe is prevented from being additionally arranged in concrete, the environment where steel bars are tightly arranged is facilitated, and construction is facilitated; the arrangement parameters of the cooling screws are arranged according to the arrangement parameters of the opposite-pull screws of the original construction frame, the arrangement distance of the cooling screws is smaller than the arrangement distance of conventional condensation pipes, and the cooling effect is remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a large-volume concrete cooling screw construction method. Background Art

[0002] In construction, concrete and reinforced concrete are the primary materials used for building structures. Due to the rapid expansion of economic development, the construction industry is developing towards tall, large, deep, and complex structures. Large equipment foundations in industrial buildings; foundations and transfer floors for high-rise, super-high-rise, and special-purpose buildings; and thick pile foundations with high bearing capacity are all large reinforced concrete structures. Massive concrete has been widely used in both industrial and civil construction.

[0003] During the curing period of concrete, the combined effects of temperature changes caused by the heat of hydration released by cement hydration and the shrinkage of concrete often lead to harmful cracks in concrete structures. Due to the large temperature gradient in large volumes of concrete, the core temperature dissipates more slowly, resulting in a greater temperature difference between inside and outside. This makes harmful cracks more likely to occur if uncontrolled. To prevent harmful cracks, the primary method is to dissipate heat within large volumes of concrete to balance the temperature difference between inside and outside.

[0004] Through years of advancement and evolution in construction technology, installing condenser tubes within the concrete to cool it has become a common practice in mass concrete construction. However, due to the thick, bulky, and densely reinforced concrete structure, installing condenser tubes is cumbersome and difficult. This is especially true for large-section beams in transition layers, where dense reinforcement is arranged, making the installation of condenser tubes even more challenging. Therefore, a construction method that eliminates the need for condenser tubes for cooling and reduces the complexity of the construction process is urgently needed. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a large-volume concrete cooling screw construction method. By setting a cooling screw instead of a tension screw, water is passed into the cooling bolt to cool it down. The cooling bolts can be densely arranged, and the cooling effect is better.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a large volume concrete cooling screw construction method, specifically comprising the following steps:

[0007] Step 1: Set up and install the cooling screw. Use the hollow screw as the cooling screw body and replace the tension screw of the original construction frame with the hollow screw for installation. The net cross-sectional area of ​​the hollow screw is larger than the net cross-sectional area of ​​the tension screw of the original construction frame.

[0008] Step 2: Connect the cooling screws with water. One end of the bottom row of hollow screws on the construction frame is connected to the water inlet pipe. The water inlet pipe is connected to the water pump. The other end of the bottom row of hollow screws is connected to one end of the upper row of hollow screws through a water pipe, and then serpentine upward to connect to one end of the top row of hollow screws. The other end of the top row of hollow screws is connected to the water outlet.

[0009] Step 3: Install the temperature measuring element. Install the temperature measuring element on the upper, middle and lower parts of the construction frame. Tie the temperature measuring element to the steel bars of the construction frame.

[0010] Step 4: Temperature control. Start the water pump and temperature detection display before pouring concrete, and record the temperature. Observe the temperature value after pouring. When the temperature difference between the temperature value and the outside temperature exceeds 25°C, increase the water pump water pressure and increase the water flow rate until the temperature difference drops to within 25°C.

[0011] Preferably, in step 1, the cooling screw is installed by assembling from top to bottom, with the height deviation of the connection nodes at the same elevation being no greater than 3 mm, and the deviation of each connection node on both sides being no greater than 3 mm.

[0012] Preferably, in step 2, the water pipe and the cooling screw are connected by a spiral joint, the spiral joint is made of brass, the inner spiral pitch of the spiral joint is consistent with that of the cooling screw, and a rubber gasket is provided inside the spiral joint for sealing.

[0013] Preferably, in step three, the connection between the temperature measuring element and the steel bar is isolated by insulating material.

[0014] Preferably, in step three, the temperature measuring element is a WZG-010 resistance temperature sensor.

[0015] Preferably, in step 4, when the temperature difference exceeds 25° C., ice water may be used to mix the concrete or the aggregate may be pre-cooled by spraying cold water.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts cooling screws instead of tension screws, avoiding the addition of condensation pipes in the concrete, which is beneficial to the environment where the steel bars are tightly arranged and facilitates construction; the layout parameters of the cooling screws are arranged according to the setting parameters of the tension screws in the original construction frame, the layout spacing of the cooling screws is smaller than the layout spacing of conventional condensation pipes, and the cooling effect is significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a construction flow chart of the present invention;

[0019] Figure 2 This is a schematic elevation diagram of the arrangement of the cooling screw and the temperature measuring element of the present invention;

[0020] Figure 3 This is a schematic diagram of fixing the temperature measuring element of the present invention;

[0021] 1. Cooling screw; 2. Temperature measuring element; 3. Steel bars; 4. Insulation material. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0023] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0024] Example 1

[0025] like Figures 1 to 3 As shown, the present invention provides a large-volume concrete cooling screw construction method, which specifically includes the following steps:

[0026] Step 1: Set up and install the cooling screw. Use the hollow screw as the main body of the cooling screw and replace the tension screw of the original construction frame with the hollow screw for installation. The net cross-sectional area of ​​the hollow screw is larger than the net cross-sectional area of ​​the tension screw of the original construction frame. Taking the M16 ordinary tension bolt as an example, the effective thread inner diameter of the M16 tension bolt is 13.55mm and the net cross-sectional area is 144mm². The replacement hollow screw has a thread inner diameter of 20mm, a wall thickness of 2mm, and a net cross-sectional area of ​​263.76mm².

[0027] Step 2: Connect the cooling screws with water. One end of the bottom row of hollow screws in the construction frame is connected to the water inlet pipe. The water inlet pipe is connected to the water pump. The other end of the bottom row of hollow screws is connected to one end of the upper row of hollow screws through a water pipe. The pipes are then snaked upward to connect to one end of the top row of hollow screws. The other end of the top row of hollow screws is connected to the water outlet. The snake-like upward connection method makes the pipeline layout beautiful and orderly.

[0028] Step 3: Install the temperature measuring element. Install the temperature measuring element on the upper, middle and lower parts of the construction frame. Tie the temperature measuring element to the steel bars of the construction frame.

[0029] Step 4: Temperature control. Start the water pump and temperature detection display before pouring concrete, and record the temperature. Observe the temperature value after pouring. When the temperature difference between the temperature value and the outside temperature exceeds 25°C, increase the water pump water pressure and increase the water flow rate until the temperature difference drops to within 25°C.

[0030] By replacing the tension screws with cooling screws, it is avoided to add condensation pipes in the concrete, which is beneficial to the environment where the steel bars are tightly arranged and facilitates construction. The layout parameters of the cooling screws are arranged according to the setting parameters of the tension screws in the original construction framework. The layout spacing of the cooling screws is smaller than the layout spacing of conventional condensation pipes, and the cooling effect is significant.

[0031] Furthermore, in step 1, the cooling screws are installed from top to bottom, with the height deviation of the connection nodes at the same elevation no greater than 3mm, and the deviation of the connection nodes on both sides no greater than 3mm. The cooling screws also serve to stabilize the frame and prevent deformation. Therefore, during installation, the cooling screws must ensure that their position error is within the construction requirements to avoid errors in the cooling screw installation, which may cause the frame to shift and the wall to have dimensional deviations after pouring.

[0032] Furthermore, in step 2, the water pipe and the cooling screw are connected using a screw joint made of brass. The screw joint has an internal helical pitch that matches that of the cooling screw, and a rubber gasket is provided within the screw joint for sealing. The brass screw joint connecting the water pipe and the cooling screw strengthens the seal and prevents water leakage. To further enhance the seal, a rubber gasket is provided within the screw joint.

[0033] Furthermore, in step 3, the connection between the temperature measuring element and the steel bar is isolated by insulating material. Since metal materials have strong thermal conductivity, insulating material is provided for isolation to avoid measurement errors caused by the temperature measuring element.

[0034] Furthermore, in step 3, the temperature measuring element is a WZG-010 resistance temperature sensor. The WZG-010 resistance temperature sensor can provide a high-precision and high-reliability temperature measurement solution to meet the diverse needs of industry and scientific research.

[0035] Furthermore, in step 4, when the temperature difference exceeds 25°C, ice water can be used to mix the concrete or the aggregate can be pre-cooled by spraying cold water. In addition to speeding up the water flow, pre-cooling the concrete material in advance can also reduce the temperature difference to a reasonable range more quickly.

[0036] Application Examples

[0037] This project, located on the newly expanded Qingnian Road, is an affordable housing project on Jianlongdong Road in Guiyang. It has four underground floors and 33 above-ground floors. The four underground floors serve as garages, while the 33 above-ground floors are residential. Basement floor heights are 3.6m (basement level -4), 3.7m (basement level -3), 3.8m (basement level -2), and 4.8m (basement level -1). The residential floors above ground all have a height of 2.9m. The structure is a frame-supported shear wall structure, designed for seismic resistance of 6 degrees. The concrete strength grades range from C30 to C55. Due to the large cross-section of the transfer floor, the maximum cross-section of the transfer floor beam reaches 1100×2000mm, with a span of 5.8m. Line loads exceed 20kN / m, reaching 55kN / m.

[0038] In addition to the above-mentioned preferred embodiments, the present invention has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A method for constructing a large volume concrete cooling screw, characterized in that: The specific steps include: Step 1: Set up and install the cooling screw. Use the hollow screw as the cooling screw body and replace the tension screw of the original construction frame with the hollow screw for installation. The net cross-sectional area of ​​the hollow screw is larger than the net cross-sectional area of ​​the tension screw of the original construction frame. Step 2: Connect the cooling screws with water. One end of the bottom row of hollow screws on the construction frame is connected to the water inlet pipe. The water inlet pipe is connected to the water pump. The other end of the bottom row of hollow screws is connected to one end of the upper row of hollow screws through a water pipe, and then serpentine upward to connect to one end of the top row of hollow screws. The other end of the top row of hollow screws is connected to the water outlet. Step 3: Install the temperature measuring element. Install the temperature measuring element on the upper, middle and lower parts of the construction frame. Tie the temperature measuring element to the steel bars of the construction frame. Step 4: Temperature control. Start the water pump and temperature detection display before pouring concrete, and record the temperature. Observe the temperature value after pouring. When the temperature difference between the temperature value and the outside temperature exceeds 25°C, increase the water pump water pressure and increase the water flow rate until the temperature difference drops to within 25°C.

2. A method for constructing a large volume concrete cooling screw according to claim 1, characterized in that: In the step 1, the cooling screw is installed by assembling from top to bottom, with the height deviation of the connection nodes at the same elevation not exceeding 3 mm, and the deviation of each connection node on both sides not exceeding 3 mm.

3. A large volume concrete cooling screw construction method according to claim 1, characterized in that: In the step 2, the water pipe is connected to the cooling screw by a spiral joint, the spiral joint is made of brass, the inner spiral pitch of the spiral joint is consistent with that of the cooling screw, and a rubber gasket is provided inside the spiral joint for sealing.

4. A method for constructing a large volume concrete cooling screw according to claim 1, characterized in that: In the step three, the connection between the temperature measuring element and the steel bar is isolated by insulating material.

5. A method for constructing a large volume concrete cooling screw according to claim 1, characterized in that: In step three, the temperature measuring element is a WZG-010 resistance temperature sensor.

6. A method for constructing a large volume concrete cooling screw according to claim 1, characterized in that: In step 4, when the temperature difference exceeds 25° C., ice water may be used to mix the concrete or the aggregate may be pre-cooled by spraying cold water.

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