A cooling and load-bearing integrated steel column for super-large cast-in-place piles and a cooling method

Abstract

The present invention provides a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile and a cooling method, belonging to the field of construction. In large-span steel structure buildings, sometimes extra-large diameter cast-in-place piles are required as the foundation load-bearing structure. To avoid excessive hydration heat generated by mass concrete, super-retarding concrete is often used in the construction of extra-large diameter cast-in-place piles. However, super-retarding concrete prolongs the construction period, and at the same time, the super-retarding process also brings additional risks to the construction of embedded components. The present invention provides a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile and a cooling method, including an inner steel column for load-bearing and an outer steel column for dissipating hydration heat, and the outer steel column also improves the bonding degree between the concrete and the steel column. The integrated steel column and cooling method of the present invention effectively reduce the construction time and enhance the performance of the cast-in-place pile at the same time.

Description

Technical Field

[0001] The present invention belongs to the field of building construction, and particularly relates to a cooling and load-bearing integrated steel column for super-large cast-in-place piles and a cooling method therefor. Background Art

[0002] Foundation engineering is an important link in large-scale building projects, and super-large diameter cast-in-place piles are a commonly used foundation form in large-span steel structure projects. However, due to the large diameter of super-large diameter cast-in-place piles and the large volume of concrete required for pile formation, a large amount of hydration heat is often generated. If the hydration heat cannot be dissipated in time, it will cause cracks and deformation in the concrete, thereby affecting the pile formation quality of super-large diameter cast-in-place piles and having an adverse impact on the safety of buildings.

[0003] Hydration heat refers to the heat released when a substance combines with water. When concrete sets, heat is released, and this heat is generated by the reaction of various substances with water, so it is called the hydration heat of concrete. In mass concrete projects, the hydration heat of concrete will cause the internal temperature of the concrete to greatly exceed the external temperature, thereby causing large temperature stresses and making the concrete crack, seriously affecting the strength and other properties of the concrete.

[0004] In addition, when constructing steel pipes using the top-down method, it is necessary to first pour concrete into the pile hole, and then insert the steel column into the cast-in-place pile that has been poured but not yet set. During the setting process of the concrete, the steel column and the concrete gradually combine into an integral cast-in-place pile. In order to ensure the mechanical properties of super-large diameter cast-in-place piles, it is necessary to ensure the bonding performance between the concrete and the steel column.

[0005] In related technologies, due to the difficulty of dissipating the hydration heat of super-large diameter cast-in-place piles, super-retarding concrete is often used to relieve the heat release during the hardening process of the concrete, reduce the accumulation of hydration heat, and thereby reduce the possibility of temperature cracks in the concrete. However, the overly long cooling time also leads to a delay in the construction period, and structures inserted or embedded in super-large diameter cast-in-place piles, such as steel columns, also face greater safety risks due to the need for long-term hoisting, bringing many uncertainties to the construction. Summary of the Invention

[0006] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a cooling and load-bearing integrated steel column for super-large cast-in-place piles and a cooling method therefor, which are used to solve the problems in the prior art that it is difficult to dissipate the hydration heat of super-large diameter cast-in-place piles, and using super-retarding concrete for construction will increase the construction period and risks.

[0007] To achieve the above purpose and other related purposes, the present invention provides a cooling and load-bearing integrated steel column for super-large cast-in-place piles and a cooling method therefor.

[0008] Among them, a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile includes an inner steel column and an outer steel column;

[0009] The column body of the inner steel column includes multiple steel plates, and the multiple steel plates are connected into a hollow columnar structure;

[0010] The outer steel column includes multiple cooling parts and connecting pieces;

[0011] The cooling part includes a water injection pipe, a water storage tank, a water collection structure, a joint, a water outlet pipe, and a heat exchange pipe;

[0012] The water storage tank is welded to the steel plate and covers the steel plate. The water collection structure is located at the bottom of the water storage tank. The top of the water collection structure is communicated with the water storage tank, and the joint is provided at the bottom outlet of the water collection structure;

[0013] Multiple heat exchange pipes are installed on the surface of the water storage tank and are internally communicated with the water storage tank. The outer ends of the heat exchange pipes are closed, and the heat exchange pipes face the outside of the pile;

[0014] The water injection pipe is connected to the top of the water storage tank, the water outlet pipe is connected to the joint at the bottom of the water storage tank, and the water outlet pipe is laid along the side of the water storage tank to the top position of the water storage tank;

[0015] The side ends of two adjacent water storage tanks are welded and connected using the connecting pieces, and multiple water storage tanks and connecting pieces are connected into an outer steel column.

[0016] Optionally, it further includes a temperature measurement system. The temperature measurement system includes multiple temperature measurement points, and the temperature measurement points are distributed in different height layers in the water storage tank and are attached to the inner side of the contact part between the water storage tank and the concrete.

[0017] Optionally, the temperature measurement system is a distributed optical fiber temperature measurement system. The distributed optical fiber temperature measurement system includes a temperature-sensing optical fiber, a temperature measurement host, a light source, and a signal receiving unit. The temperature-sensing optical fiber is laid from top to bottom and circuitously in the water storage tank and is attached to the inner side of the contact part between the water storage tank and the concrete. The two ends of the temperature-sensing optical fiber are respectively connected to the light source and the signal receiving unit, and both the light source and the signal receiving unit are connected to the temperature measurement host and transmit data.

[0018] Optionally, the distance between the outer end of the heat exchange pipe and the innermost stirrup of the concrete pile is less than 10 centimeters.

[0019] Optionally, multiple heat exchange pipes are arranged in a plum blossom shape on the surface of the water storage tank.

[0020] Optionally, the water collection structure is an inclined body with a larger top and a smaller bottom, and the inclined surface of the water collection structure extends all the way to the outlet at the bottom of the water collection structure.

[0021] Optionally, the outlet pipe is located in the cavity area surrounded by the connecting piece, the outer wall of the water storage bin, and the inner steel column.

[0022] Optionally, it further includes a column base, the column base is in a conical shape with a larger upper part and a smaller lower part, and the column base is welded to the bottoms of the inner steel column and the outer steel column.

[0023] Optionally, the inner steel column further includes a column head and lifting rings. The column head is welded to the top of the column body, and a plurality of the lifting rings are welded around the column head.

[0024] Among them, a cooling method for an extra-large cast-in-place pile uses the above-mentioned cooling and load-bearing integrated steel column for an extra-large cast-in-place pile, and includes the following steps:

[0025] Water injection step: Inject a coolant into the water storage bin through a water injection pipe.

[0026] Cooling step: The temperature measurement system continuously detects the temperature. When the temperature exceeds the set value, the high-temperature coolant is pumped out by an external water pump system and low-temperature coolant is injected at the same time.

[0027] Water pumping step: After the temperature drops to the set value and stabilizes, the coolant is pumped out by an external water pump system.

[0028] As described above, the cooling and load-bearing integrated steel column and cooling method for an extra-large cast-in-place pile of the present invention have at least the following beneficial effects:

[0029] Reduce the construction period and improve the pile forming quality. In the cooling and load-bearing integrated steel column and cooling method for an extra-large cast-in-place pile of the present invention, the steel column includes an inner steel column and an outer steel column. The inner steel column is used for load-bearing, and the outer steel column is used for dissipating the hydration heat. The outer steel column is provided with a cooling part, including a water injection pipe, a water storage bin, a water collection structure, a joint, an outlet pipe, and a heat exchange pipe. Among them, a plurality of heat exchange pipes are installed on the surface of the water storage bin and are internally communicated with the water storage bin. The outer ends of the heat exchange pipes are closed, and the coolant can circulate in the water storage bin. Heat exchange with the concrete is carried out through the water storage bin wall and the heat exchange pipe, which speeds up the cooling speed and improves the construction efficiency and quality of the cast-in-place pile; at the same time, the heat exchange pipes face the outside of the pile body and are directly inserted into the concrete, directly contacting the concrete, greatly increasing the contact area, not only improving the effect of dissipating the hydration heat, but also improving the bonding performance between the concrete and the steel column, and greatly improving the pile forming quality of the extra-large diameter cast-in-place pile. Description of the Drawings

[0030] Figure 1 It shows a hoisting schematic diagram of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile of the present invention.

[0031] Figure 2 It shows an axonometric schematic diagram of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile of the present invention.

[0032] Figure 3 Shown is the front view of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile according to the present invention.

[0033] Figure 4 Shown is a schematic diagram of the inner steel column of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile according to the present invention.

[0034] Figure 5 Shown is a schematic diagram of the cooling part of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile according to the present invention.

[0035] Figure 6 Shown is a schematic diagram of the connection at the side end of the water storage tank of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile according to the present invention.

[0036] Figure 7 Shown is a schematic diagram of the B-B cross-section of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile according to the present invention.

[0037] Figure 8 Shown is a schematic diagram of the cooling part of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile according to the present invention.

[0038] Figure 9 Shown is a schematic diagram of the layout of the temperature measurement system of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile according to the present invention.

[0039] Figure 10 Shown is a schematic diagram of the temperature measurement system of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile according to the present invention.

[0040] Figure 11 Shown is a step diagram of the cooling method of a cooling and load-bearing integrated steel column for an extra-large cast-in-place pile according to the present invention.

[0041] Wherein: column body 101, steel plate 1011, column head 102, lifting ring 103, column foot 104, cooling part 20, water storage tank 204, water collecting structure 202, joint 209, water outlet pipe 201, water injection pipe 205, heat exchange pipe 203, water valve 206, water pump 207, connecting piece 30, temperature sensing optical fiber 401, temperature measurement main unit 402, light source 403, signal receiving unit 404, concrete pile 50 Specific embodiments

[0042] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0043] Please refer to Figures 1 to 11It should be noted that the structures, proportions, sizes, etc. shown in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope in which the present invention can be implemented.

[0044] The following various embodiments are only for illustration purposes. Combinations can be made between the various embodiments, and it is not limited to the content shown in the following single embodiment.

[0045] Due to the large diameter of the super-large diameter cast-in-place pile and the large volume of concrete required for pile formation, a large amount of hydration heat is often generated. If the hydration heat cannot be dissipated in time, it will cause cracks and deformation in the concrete, which will in turn affect the pile formation quality of the super-large diameter bored cast-in-place pile and have an adverse impact on the safety of the building.

[0046] To address this problem, super-retarding concrete is often used in actual engineering during construction to allow the hydration heat to be fully discharged. However, this approach will greatly delay the construction period and increase the uncertainty during construction. At the same time, please refer to Figure 1 , the upper structure load-bearing members partially inserted or embedded into the super-large diameter cast-in-place pile also face relatively large safety risks due to the need for long-time hoisting.

[0047] For an embodiment of a cooling and load-bearing integrated steel column for a super-large cast-in-place pile of the present invention, please refer to Figures 2 - 4 ,

[0048] The steel column body includes an inner steel column and an outer steel column. Figure 4 Shown as the inner steel column, the column body 101 of the inner steel column includes multiple steel plates 1011, and the multiple steel plates 1011 are connected into a hollow columnar structure;

[0049] The outer steel column includes a plurality of cooling parts 20 and connecting parts 30. Figure 5 Shown as the cooling part 20, the cooling part 20 includes a water injection pipe 205, a water storage tank 204, a water collection structure 202, a joint 209, a water outlet pipe 201, and a heat exchange pipe 203;

[0050] Please combine Figure 6The water sump 204 is welded to the steel plate 1011 and covers the steel plate 1011. The water collection structure 202 is located at the bottom of the water sump 204. The top of the water collection structure 202 communicates with the water sump 204. A joint 209 is provided at the bottom outlet of the water collection structure 202;

[0051] A plurality of the heat exchange tubes 203 are installed on the surface of the water sump 204 and communicate with the water sump 204 inside. The outer ends of the heat exchange tubes 203 are closed, and the heat exchange tubes 203 face the outside of the pile body;

[0052] The water injection pipe 205 is connected to the top of the water sump 204. The water outlet pipe 201 is connected to the joint 209 at the bottom of the water sump 204. The water outlet pipe 201 is laid along the side of the water sump 204 to the top position of the water sump 204;

[0053] The side ends of two adjacent water sumps 204 are welded and connected using the connector 30. A plurality of the water sumps 204 and the connectors 30 are connected to form an outer steel column.

[0054] The inner steel column of the integral steel column is mainly used for bearing weight, and the outer steel column is mainly used for cooling. The outer steel column and the inner steel column are combined into a whole, and the bearing capacity will also be improved. In the above embodiment, as Figure 6 shown, the water sump can be a single integral welded to the inner steel column, or can be assembled by multiple water sump plates and the inner steel column into a closed water sump space, thereby saving the material usage. In this embodiment, the cross-section of the steel column is a regular hexagon. The inner steel column is spliced by 6 steel plates 1011, and then 6 water sumps as Figure 5 shown are correspondingly welded to each steel plate, and then 6 water sumps are welded and reinforced into a whole by connectors like angle irons, so as to combine the inner steel column and the outer steel column into an integral steel column.

[0055] In the prior art, during construction, concrete is first poured into the pile hole of the cast-in-place pile. Before the concrete solidifies, the steel column is inserted into the concrete. As the concrete solidifies, the steel column and the concrete are combined into a whole, thereby improving the bearing capacity of the super-large cast-in-place pile. Specifically during construction, after the steel column is inserted into the concrete and before the concrete solidifies, the concrete cannot fully support the steel column. At this time, a crane is needed to temporarily lift the entire steel column. This process will occupy the crane, and at the same time, long-term suspension will also bring safety risks to the construction.

[0056] In the project, concrete with a relatively fast setting speed can also be used to reduce the suspension time of the steel column. However, this method cannot be used in super-large diameter cast-in-place piles. The reason is that the concrete in super-large cast-in-place piles is relatively thick, and the hydration heat will be generated during the concrete setting process. A large amount of hydration heat generated by the concrete with a relatively fast setting speed cannot be discharged and dissipated in time, which will cause the internal temperature of the concrete to greatly exceed the external temperature, resulting in large temperature stresses, causing cracks in the concrete, and seriously affecting the strength and other properties of the concrete.

[0057] In this embodiment, the outer surface of the water tank is the contact surface with the concrete. A plurality of heat exchange tubes are arranged on the surface of the water tank. The inside of the heat exchange tubes is communicated with the water tank. The liquid in the water tank can enter the heat exchange tubes. The outer ends of the heat exchange tubes are closed, and the liquid will not enter the concrete. The plurality of heat exchange tubes are arranged perpendicular to the surface of the water tank and inserted deep into the concrete, increasing the contact surface between the water tank and the heat exchange tubes. This can not only increase the bonding performance between the steel column and the concrete, but also increase the heat exchange efficiency and heat exchange balance between the water tank and the concrete, reducing the overall overheating and local thermal imbalance of the cast-in-place pile. Therefore, even in super-large cast-in-place piles, concrete with a fast setting speed can be used to speed up the construction period, reduce the uncertainty of the long-term suspension of the steel column by the crane, and at the same time, the structural performance is also improved, the steel column is strengthened, and the combination of the concrete and the steel column is more compact.

[0058] During specific implementation, the heat exchange tubes can be ordinary cylindrical water pipes to save costs; or the Figure 8 conical water pipes shown in the figure, or hollow pipes with a prismatic shape. The sharp corners of the prism are oriented towards the bottom of the drill hole. In this way, after the pile hole is poured and the steel column is inserted, the insertion resistance can be reduced and the construction process can be simplified.

[0059] As a further solution of this embodiment, it further includes a temperature measurement system. The temperature measurement system includes a plurality of temperature measurement points. The temperature measurement points are distributed in different height layers inside the water tank 204 and are attached to the inner side of the contact part between the water tank 204 and the concrete.

[0060] In the project, the concrete can obtain better setting quality at about 25 degrees Celsius. After the concrete construction is completed, there is a curing period of about half a month to one month. During the setting period and the curing period, appropriate environmental conditions can make the concrete reach the best state. During the process of the gradual setting and hardening of cement and water, hydration requires appropriate temperature and humidity. If the temperature and humidity are not appropriate, the concrete will crack and break.

[0061] In this embodiment, by arranging a plurality of temperature sensors on the inner surface of the water sump in direct contact with the concrete, the temperature distribution inside the concrete can be obtained at all times. During the solidification process, according to the temperature condition, a coolant can be injected into the water sump by an external water pump system, and the coolant can be circulated if necessary, so as to achieve the effect of controlling the temperature during the solidification and curing of the concrete. This not only solves the problem of hydration heat during the solidification of the super-large diameter cast-in-place pile, but also solves the problem of temperature control during the curing process, effectively improving the pile-forming quality and comprehensive bearing capacity of the super-large diameter concrete cast-in-place pile.

[0062] Further, the temperature measurement system is a distributed optical fiber temperature measurement system. The distributed optical fiber temperature measurement system includes a temperature-sensitive optical fiber 401, a temperature measurement host 402, a light source 403, and a signal receiving unit 404. The temperature-sensitive optical fiber 401 is laid in a circuitous manner from top to bottom in the water sump 204 and is attached to the inner side of the contact part between the water sump 204 and the concrete. Both ends of the temperature-sensitive optical fiber 401 are respectively connected to the light source 403 and the signal receiving unit 404, and the light source 403 and the signal receiving unit 404 are both connected to the temperature measurement host 402 and transmit data.

[0063] The distributed optical fiber temperature measurement system can be based on OFDR or other forms. The distributed optical fiber sensor is a truly distributed measurement, which can continuously obtain the measurement information at each position along the detection optical fiber, greatly reducing the false alarm and missed alarm rates, and realizing real-time monitoring at the same time. By attaching the temperature-sensitive optical fiber to the water sump and correspondingly recording the positions on the inner side of the water sump corresponding to different lengths of the temperature-sensitive optical fiber, a temperature distribution map inside the cast-in-place pile can be simulated on a computer, and the temperature changes at each moment can be connected into a temperature-time map of the cast-in-place pile in the time dimension. In addition to playing a monitoring role, it can also be used for scientific research and analysis of the concrete solidification process.

[0064] It should be noted that Figure 9 only one way of arranging the temperature-sensitive optical fiber is listed. During specific implementation, it can be arranged according to relevant purposes and temperature measurement requirements. For example, an S-shaped arrangement can be adopted to cover the entire water sump surface.

[0065] Please refer to Figure 7 in this embodiment, the distance between the outer end of the heat exchange tube 203 and the innermost stirrup of the concrete pile 50 is less than 10 cm.

[0066] The heat exchange tubes simultaneously serve the functions of increasing the bonding force between the steel column and the concrete and increasing the heat exchange surface between the coolant and the concrete. The deeper the heat exchange tubes are inserted into the concrete, the better the above effects. However, when the steel column is inserted into the concrete, during the insertion process, the heat exchange tubes on the outer side of the steel column will come into contact with the already poured concrete, generating resistance between each other. The longer the heat exchange tubes, the greater the resistance, which will increase the requirements for the insertion equipment. In addition, the longer the heat exchange tubes, the greater the damping acting on the heat exchange tubes during the insertion process. When the resistance acts on the heat exchange tubes, it may damage the connection between the heat exchange tubes and the steel column, thus causing the steel column to fail.

[0067] Based on considerations of the performance of the steel column itself and the heat exchange and bonding force effects, when the thickness of the part of the heat exchange tube that is not inserted into the concrete at the end is less than 10 cm, better heat exchange and bonding force effects can be obtained. In specific implementation, while meeting the above requirement of less than 10 cm, shortening the designed length of the heat exchange tube can improve the overall performance of the steel column.

[0068] For this embodiment, please refer to FIGS. 2 and Figure 3 , a plurality of the heat exchange tubes 203 are arranged in a plum blossom shape on the surface of the water sump 204. The advantage of this arrangement is that without changing the existing dimensions, the heat exchange tubes are alternately arranged, and the heights between different vertical columns are staggered from each other. At the same horizontal layer height, the distance between the mounting holes becomes larger, effectively improving the mechanical properties of the steel plate on the surface of the water sump and enhancing the overall strength of the steel column.

[0069] For this embodiment, please refer to Figure 5 and Figure 8 , the water collecting structure 202 is an inclined body with a larger upper part and a smaller lower part, and the inclined surface of the water collecting structure 202 extends all the way to the outlet at the bottom of the water collecting structure 202. The water collecting structure at the bottom of the water sump is an inclined body, and the bottom sharp corner is the outlet. When it is necessary to pump out the coolant, this kind of water collecting structure can ensure that there is no coolant left at the bottom of the water sump, preventing the internal steel column of the cast-in-place pile from gradually corroding and rusting due to the coolant left in the water sump during the use of the cast-in-place pile, and further affecting the safety of the building structure.

[0070] Furthermore, please refer to Figure 7 and Figure 8 , the water outlet pipe 201 is located in the cavity area surrounded by the connecting piece 30, the outer wall of the water sump 204, and the inner steel column.

[0071] In specific implementation, the integral steel column will be inserted into the concrete, and the water collecting structure and the water outlet will penetrate deep into the concrete. In order to prevent the water outlet pipe and the connecting piece from being damaged during the insertion of the steel column, they need to be protected. Specifically, the outside of the water collecting structure is covered by welding a steel plate, and the water outlet pipe is led out to the top of the integral steel column through the cavity surrounded by the water sump, the inner steel column, and the connecting piece, leaving an interface for subsequent use.

[0072] For this embodiment, please refer to Figure 3 , the integral steel column further includes a column base 104, the column base 104 is in a conical shape with a larger upper part and a smaller lower part, and the column base 104 is welded to the bottoms of the inner steel column and the outer steel column. As mentioned above, during construction, concrete will be poured first, and then the integral steel column will be inserted into the concrete. Designing the column base of the integral steel column into a conical shape with a larger upper part and a smaller lower part can greatly reduce the resistance of the concrete to the steel column during the insertion process of the steel column, reduce the requirements for construction equipment, simplify the construction process, and reduce the construction cost.

[0073] Furthermore, the inner steel column further includes a column head 102 and a lifting ring 103. The column head 102 is welded to the top of the column body 101, and a plurality of the lifting rings 103 are welded around the column head 102. The steel column of this embodiment is applicable to super-large diameter cast-in-place piles. In some scenarios, the steel column may weigh hundreds of tons. Before the steel column is inserted, it needs to be lifted above the concrete pit of the cast-in-place pile for preparation of insertion; after the insertion is completed, it also needs to be temporarily suspended by a crane and wait for the concrete to solidify. In this embodiment, by setting a plurality of lifting rings at the top of the column head and lifting with multiple points simultaneously, the stability and safety of the lifting can be improved.

[0074] This embodiment provides a cooling method for super-large cast-in-place piles. The super-large cast-in-place pile adopts the above-mentioned integral steel column, and includes the following steps:

[0075] Water injection step: Inject coolant into the water storage tank through a water injection pipe;

[0076] Cooling step: The temperature measurement system continuously detects the temperature. When the temperature exceeds the set value, the high-temperature coolant is pumped out by an external water pump system and low-temperature coolant is injected at the same time;

[0077] Pumping step: After the temperature drops to the set value and stabilizes, the coolant is pumped out by an external water pump system.

[0078] In the above embodiment, the consumption of the coolant is relatively large. To reduce the cost, ordinary water can be directly used as the coolant. However, when pumping out, there may be water vapor left in the water storage tank, resulting in situations such as rust during the long-term use of the cast-in-place pile. Therefore, in the case of simultaneous construction of multiple cast-in-place piles and the coolant can be recycled to reduce costs, a coolant with better performance can also be used, such as an oil-based coolant. Even if there is residue in the water storage tank, it will not cause metal rust.

[0079] The cooling method of this embodiment can not only perform cooling during the concrete solidification process, but also control the temperature during the concrete curing period. China spans a large distance from north to south, and the temperature difference is also large. Excessive or too low temperature will pose challenges to the concrete curing. The integral steel column and cooling method provided by the present invention can be used to cool and relieve the hydration heat during the cement solidification process through the circulation of the coolant in the water tank, and can also be used for temperature regulation to provide a suitable curing temperature for the concrete and enhance the comprehensive performance of the concrete cast-in-place pile after pile formation.

[0080] In summary, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0081] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A cooling and load-bearing integrated steel column for super-large cast-in-place piles, Characterized in that: It includes an inner steel column and an outer steel column; The column body (101) of the inner steel column includes multiple steel plates (1011), and the multiple steel plates (1011) are connected into a hollow columnar structure; The outer steel column includes multiple cooling parts (20) and connecting parts (30); The cooling part (20) includes a water injection pipe (205), a water storage tank (204), a water collection structure (202), a joint (209), a water outlet pipe (201) and a heat exchange pipe (203); The water storage tank (204) is welded to the steel plate (1011) and covers the steel plate (1011), the water collection structure (202) is located at the bottom of the water storage tank (204), the top of the water collection structure (202) is communicated with the water storage tank (204), and the joint (209) is provided at the bottom outlet of the water collection structure (202); Multiple heat exchange pipes (203) are installed on the surface of the water storage tank (204) and are internally communicated with the water storage tank (204), the outer ends of the heat exchange pipes (203) are closed, and the heat exchange pipes (203) face the outside of the pile body; The water injection pipe (205) is connected to the top of the water storage tank (204), the water outlet pipe (201) is connected to the joint (209) at the bottom of the water storage tank (204), and the water outlet pipe (201) is laid along the side of the water storage tank (204) to the top position of the water storage tank (204); The side ends of two adjacent water storage tanks (204) are welded and connected by the connecting part (30), and multiple water storage tanks (204) and connecting parts (30) are connected into an outer steel column, Multiple heat exchange pipes (203) are arranged in a plum blossom shape on the surface of the water storage tank (204); The water outlet pipe (201) is located in the cavity area surrounded by the connecting part (30), the outer wall of the water storage tank (204) and the inner steel column; It also includes a column foot (104), the column foot (104) is in a conical shape with a large top and a small bottom, and the column foot (104) is welded to the bottoms of the inner steel column and the outer steel column.

2. The cooling and load-bearing integrated steel column for super-large cast-in-place piles according to claim 1, Characterized in that, It also includes a temperature measurement system, the temperature measurement system includes multiple temperature measurement points, the temperature measurement points are distributed in different height layers in the water storage tank (204), and are attached to the inner side of the contact part between the water storage tank (204) and the concrete.

3. The cooling and load-bearing integrated steel column for super-large cast-in-place piles according to claim 2, Characterized in that, The temperature measurement system is a distributed optical fiber temperature measurement system, which includes a temperature sensing optical fiber (401), a temperature measurement host (402), a light source (403) and a signal receiving unit (404). The temperature sensing optical fiber (401) is laid in a circuitous manner from top to bottom in the water sump (204), and is attached to the inner side of the contact part between the water sump (204) and the concrete. Both ends of the temperature sensing optical fiber (401) are respectively connected to the light source (403) and the signal receiving unit (404), and both the light source (403) and the signal receiving unit (404) are connected to the temperature measurement host (402) and transmit data.

4. A cooling and load-bearing integrated steel column for super-large cast-in-place piles as described in claim 1, characterized in that, the distance between the outer end of the heat exchange tube (203) and the innermost stirrup of the concrete pile (50) is less than 10 cm.

5. A cooling and load-bearing integrated steel column for super-large cast-in-place piles as described in claim 1, characterized in that, the water collection structure (202) is an inclined body with a larger upper part and a smaller lower part, and the inclined surface of the water collection structure (202) extends continuously to the outlet at the bottom of the water collection structure (202).

6. A cooling and load-bearing integrated steel column for super-large cast-in-place piles as described in claim 1, characterized in that, the inner steel column further includes a column head (102) and a lifting ring (103), the column head (102) is welded to the top of the column body (101), and a plurality of the lifting rings (103) are welded around the column head (102).

7. A cooling method for super-large cast-in-place piles, characterized in that, using a cooling and load-bearing integrated steel column for super-large cast-in-place piles as described in claim 3, which includes the following steps: Water injection step: Inject coolant into the water sump through a water injection pipe; Cooling step: The temperature measurement system continuously detects the temperature. When the temperature exceeds the set value, the high-temperature coolant is pumped out by an external water pump system and low-temperature coolant is injected at the same time; Water pumping step: After the temperature drops to the set value and stabilizes, the coolant is pumped out by an external water pump system.

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