Reinforced concrete hot pile capable of preventing frozen soil from melting

Abstract

The invention discloses a reinforced concrete hot pile for preventing frozen soil from melting and relates to the technical field of cold region pile foundation construction engineering. In order to solve the problems that an existing pile foundation can transfer heat to frozen soil in summer, the frozen soil is melted, friction force cannot be generated between the pile foundation and the frozen soil, and then uneven settlement of a tower foundation occurs. The system comprises a concrete pile foundation, a reinforcement cage is pre-embedded in the concrete pile foundation, a hot bar is fixedly mounted on the inner side of the reinforcement cage before the concrete pile foundation is poured, the hot bar comprises a condensation section and an evaporation section, the condensation section of the hot bar is exposed in the air, and the evaporation section is arranged in the concrete pile foundation to form a hot pile cooling system. The concrete pile foundation and the surrounding frozen soil are cooled by using the refrigeration function of the hot rod in winter, and the frozen soil is cooled in winter to be firmer, so that the influence of high temperature in summer on the frozen soil is counteracted, the bearing capacity stability of the cast-in-place pile is improved, the cast-in-place pile better adapts to climate warming, and pile foundation catastrophe caused by frozen soil degradation is prevented and controlled.

Description

Technical Field

[0001] The invention relates to the technical field of pile foundation construction engineering in cold regions, and in particular to a reinforced concrete thermal pile for preventing frozen soil from melting. Background Art

[0002] During the construction of transmission lines, the tower foundation serves as the supporting core of the transmission tower, and its performance is directly related to the safe and stable operation of the transmission line.

[0003] When the tower foundation is arranged in a cold area, the pile foundation needs to be constructed in the permafrost layer. The pile foundation offsets the upper load through the friction between the pile foundation and the permafrost, thereby ensuring the stability of the pile foundation.

[0004] However, in summer, the air is hotter, and the heat will be transferred to the permafrost through the pile foundation, causing the permafrost to melt. Friction cannot be generated between the pile foundation and the permafrost, which will lead to uneven settlement of the tower foundation.

[0005] In summary, the existing pile foundation will transfer heat to the frozen soil in summer, causing the frozen soil to melt. Friction cannot be generated between the pile foundation and the frozen soil, which in turn leads to uneven settlement of the tower foundation. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem that existing pile foundations transfer heat to frozen soil in summer, causing the frozen soil to melt. This prevents friction between the pile foundation and the frozen soil, which in turn leads to uneven settlement of the tower foundation. Furthermore, a reinforced concrete thermal pile is provided that prevents frozen soil from melting.

[0007] The technical solution of the present invention is: a reinforced concrete thermal pile for preventing frozen soil from melting, comprising: a concrete pile foundation, a steel cage embedded in the concrete pile foundation, and a thermal rod fixedly installed inside the steel cage before the concrete pile foundation is poured;

[0008] The heat rod includes a condensation section and an evaporation section. The condensation section of the heat rod is arranged above the concrete pile foundation and exposed to the air, and the evaporation section of the heat rod is arranged vertically inside the concrete pile foundation. The heat rod releases cold energy to the frozen soil to prevent the frozen soil from melting.

[0009] Furthermore, the condensing section of the heat rod is vertically arranged above the concrete pile foundation.

[0010] Furthermore, the condensing section of the heat rod is arranged above the concrete pile foundation in an inclined manner in a direction away from the concrete pile foundation.

[0011] Furthermore, the heat rod has at least one uniformly distributed along the circumference.

[0012] Furthermore, the heat pipe is fixedly installed inside the steel reinforcement cage through a connecting piece.

[0013] Furthermore, the connecting piece is a hoop, and the hoop is sleeved on the outside of the heat pipe and a single steel bar on the steel reinforcement cage to fix the heat pipe and the steel reinforcement cage.

[0014] Furthermore, the connecting piece is a galvanized binding wire, and the galvanized binding wire is cross-bound on a single steel bar on the heat pipe and the steel reinforcement cage to fix the heat pipe and the steel reinforcement cage.

[0015] Furthermore, the heat pipe and a single steel bar on the steel reinforcement cage are connected by welding to fix the heat pipe and the steel reinforcement cage.

[0016] Furthermore, the diameter of the bottom of the concrete pile foundation gradually increases downward, so as to increase the contact area with the foundation soil.

[0017] Furthermore, the steel reinforcement cage includes a dense area and a non-dense area. The dense area is arranged at the top of the concrete pile foundation, and the non-dense area is arranged in the middle and bottom of the concrete pile foundation.

[0018] The present invention has the following effects compared with the prior art:

[0019] 1. The reinforced concrete heat pile for preventing frozen soil from melting provided by the present invention has the condensation section of the heat pipe exposed to the air, and the evaporation section is arranged inside the concrete pile foundation, forming a heat pile cooling system. Utilize the function of the heat pipe to refrigerate in winter to cool the concrete pile foundation and the surrounding frozen soil, cool the frozen soil in winter to make it more solid, and then offset the influence of high temperature on the frozen soil in summer, improve the bearing capacity stability of the cast-in-place pile, and better adapt to climate change and prevent pile disasters caused by frozen soil degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall structural schematic diagram of the present invention;

[0021] Figure 2 is Figure 1 the top view of;

[0022] Figure 3 is Figure 1 the schematic diagram of the inclined arrangement of the condensation section of the heat pipe in;

[0023] In the figure: 1. Concrete pile foundation; 2. Steel reinforcement cage; 3. Heat pipe. DETAILED DESCRIPTION OF THE INVENTION

[0024] Detailed Description One: Combine Figures 1 to 3Description of this embodiment: This embodiment includes a concrete pile foundation 1, in which a steel reinforcement cage 2 is embedded. Before the concrete pile foundation 1 is poured, a heat pipe 3 is fixedly installed inside the steel reinforcement cage 2. The heat pipe 3 includes a condensation section and an evaporation section. The condensation section of the heat pipe 3 is arranged above the concrete pile foundation 1 and exposed to the air, and the evaporation section of the heat pipe 3 is vertically arranged inside the concrete pile foundation 1. Cold is released to the frozen soil through the heat pipe 3 to prevent the frozen soil from melting. There is a flowable liquid ammonia inside the heat pipe 3, and the boiling point of the liquid ammonia is relatively low. In winter, the liquid ammonia in the exposed condensation section of the heat pipe 3 turns into a liquid when it encounters cold and falls, and turns into a gas at the bottom of the concrete pile foundation 1 to absorb heat, thereby taking away the heat in the surrounding frozen soil.

[0025] For the reinforced concrete heat pile for preventing frozen soil from melting in this embodiment, the condensation section of the heat pipe 3 is exposed to the air, and the evaporation section is arranged inside the concrete pile foundation 1, forming a heat pile cooling system. The function of the heat pipe 3 for refrigeration in winter is used to cool the concrete pile foundation 1 and the surrounding frozen soil. In winter, the frozen soil is cooled to make it more solid, thereby offsetting the impact of high temperature on the frozen soil in summer, improving the bearing capacity stability of the cast-in-place pile, and better adapting to climate change and preventing pile foundation disasters caused by frozen soil degradation.

[0026] Specific embodiment two: Combine Figure 1 Description of this embodiment: The difference between this embodiment and the first specific embodiment is that the condensation section of the heat pipe 3 is vertically arranged above the concrete pile foundation 1. When the volume of the tower above the concrete pile foundation 1 is small, the condensation section can be vertically arranged, that is, it will not interfere with the tower and can also reduce the space occupied by the concrete heat pile. The other components and connection relationships are the same as those in the first specific embodiment.

[0027] Specific embodiment three: Combine Figure 3 Description of this embodiment: The difference between this embodiment and the first specific embodiment is that the condensation section of the heat pipe 3 is inclined upward away from the concrete pile foundation 1 above the concrete pile foundation 1. When the volume of the tower above the concrete pile foundation 1 is large, the condensation section is inclined to avoid interference with the tower, thereby ensuring the smooth installation of the tower, and the heat pipe 3 can still conduct heat transfer. The other components and connection relationships are the same as those in the first specific embodiment.

[0028] Specific embodiment four: Combine Figure 2 Description of this embodiment: The difference between this embodiment and the first specific embodiment is that the heat pipe 3 has at least one evenly distributed circumferentially. In this embodiment, the number of heat pipes 3 is one. Of course, this is not restrictive, and the number of heat pipes 3 can be flexibly adjusted according to actual needs to make the heat transfer effect better. The other components and connection relationships are the same as those in the first specific embodiment.

[0029] Specific embodiment five: Combine Figures 1 to 3Regarding this embodiment, the difference between this embodiment and the first specific embodiment is that the heat rod 3 is fixedly installed inside the steel reinforcement cage 2 through a connecting member (not shown in the figure). During the fabrication of the steel reinforcement cage 2, the installation position of the heat rod 3 is reserved, and a connecting member is provided to ensure that the heat rod 3 can be accurately positioned during installation. The other components and connection relationships are the same as those in the first specific embodiment.

[0030] Specific embodiment six: Figures 1 to 3 Regarding this embodiment, the difference between this embodiment and the fifth specific embodiment is that the connecting member is a hoop. The hoop is sleeved on the outside of the single reinforcing bar on the heat rod 3 and the steel reinforcement cage 2 to fix the heat rod 3 and the steel reinforcement cage 2. Tightening the bolts on the hoop can fasten the heat rod 3 and the single reinforcing bar on the steel reinforcement cage 2 together. The other components and connection relationships are the same as those in the fifth specific embodiment.

[0031] Specific embodiment seven: Figures 1 to 3 Regarding this embodiment, the difference between this embodiment and the fifth specific embodiment is that the connecting member is a galvanized binding wire. The galvanized binding wire is cross-bound on the single reinforcing bar on the heat rod 3 and the steel reinforcement cage 2 to fix the heat rod 3 and the steel reinforcement cage 2. The other components and connection relationships are the same as those in the fifth specific embodiment.

[0032] Specific embodiment eight: Figures 1 to 3 Regarding this embodiment, the difference between this embodiment and the first specific embodiment is that the heat rod 3 and the single reinforcing bar on the steel reinforcement cage 2 are welded together to fix the heat rod 3 and the steel reinforcement cage 2. The other components and connection relationships are the same as those in the first specific embodiment.

[0033] Specific embodiment nine: Figures 1 to 3 Regarding this embodiment, the difference between this embodiment and the first specific embodiment is that the diameter of the bottom of the concrete pile foundation 1 gradually increases downward, thereby increasing the contact area with the foundation soil. The larger the contact area, the better the stability of the concrete pile foundation 1, thus ensuring the safety of the tower. The other components and connection relationships are the same as any one of the first to eighth specific embodiments.

[0034] Specific embodiment ten: Figures 1 to 3 Regarding this embodiment, the difference between this embodiment and the first specific embodiment is that the steel reinforcement cage 2 includes a densified area and a non-densified area. The densified area is arranged at the top of the concrete pile foundation 1, and the non-densified area is arranged in the middle and bottom of the concrete pile foundation 1. The spacing between the reinforcing bars in the densified area is smaller. By increasing the number of reinforcing bars and reducing the spacing, the bearing capacity and bending resistance of the steel reinforcement cage 2 at the key parts are improved. The spacing between the reinforcing bars in the non-densified area is relatively larger. On the premise of ensuring the overall strength of the concrete pile foundation 1, the amount of reinforcing bars is reasonably controlled to reduce costs. The other components and connection relationships are the same as any one of the first to eighth specific embodiments.

[0035] Construction steps of this embodiment:

[0036] Step 1: According to the design requirements, prepare the required construction materials, including high-strength concrete, steel bars, heat pipes 3, etc. Level and clean the construction site to ensure that the construction site meets the construction requirements, and build temporary construction facilities such as steel bar processing sheds and concrete mixing stations.

[0037] Step 2: Fabricate the steel reinforcement cage 2 in the processing factory according to the design drawings. First, cut and bend the steel bars according to the design requirements of the encrypted area and non-encrypted area of the steel reinforcement cage 2. In the encrypted area, reduce the steel bar spacing according to the design requirements and increase the number of steel bars; in the non-encrypted area, arrange the steel bars at the normal spacing. Then, bind or weld the main steel bars and stirrups to form a complete steel reinforcement cage 2 skeleton. During the fabrication of the steel reinforcement cage 2, reserve the installation position of the heat pipe 3 and set fixing parts to ensure that the heat pipe 3 can be accurately positioned during installation. Inspect the fabricated steel reinforcement cage 2 to ensure that the specifications, quantity, spacing, and connection quality of the steel bars meet the design requirements.

[0038] Step 3: Install the selected heat pipe 3 at the reserved position of the steel reinforcement cage 2 according to the design requirements, and firmly connect the heat pipe 3 to the steel reinforcement cage 2 by using connectors or welding. After the installation of the heat pipe 3 is completed, check the installation position and fixing condition of the heat pipe 3 to ensure that the heat pipe 3 is firmly installed and accurately positioned. Check the sealing performance of the heat pipe 3 to prevent the leakage of the working medium inside the heat pipe 3.

[0039] Step 4: Hoist the fabricated steel reinforcement cage 2 and the installed heat pipe 3 to the pile foundation construction hole position. Lay a certain thickness of concrete cushion at the bottom of the pile foundation, and then place the steel reinforcement cage 2 and the heat pipe 3 as a whole into the hole position. Adopt the layered pouring method to pour high-strength concrete, and control the pouring thickness of each layer within 30 cm to 50 cm. At the same time, vibrate to ensure that the concrete is poured densely. During the concrete pouring process, pay attention to protecting the steel reinforcement cage 2 and the heat pipe 3 to avoid displacement or damage. Real-time monitor the slump, workability and other indexes of the concrete to ensure that the concrete quality meets the requirements.

[0040] The content of the present invention is not limited to the content of the above embodiments. The combination of one or several specific embodiments can also achieve the purpose of the invention.

Claims

1. A reinforced concrete thermal pile for preventing frozen soil from melting, characterized in that, Including: A concrete pile foundation (1), in which a steel reinforcement cage (2) is embedded. Before the concrete pile foundation (1) is poured, a heat pipe (3) is fixedly installed inside the steel reinforcement cage (2). The heat pipe (3) includes a condensation section and an evaporation section. The condensation section of the heat pipe (3) is arranged above the concrete pile foundation (1) and exposed to the air, and the evaporation section of the heat pipe (3) is vertically arranged inside the concrete pile foundation (1). Cold is released to the frozen soil through the heat pipe (3) to prevent the frozen soil from melting.

2. A reinforced concrete thermal pile for preventing frozen soil from melting according to claim 1, characterized in that, The condensation section of the heat pipe (3) is vertically arranged above the concrete pile foundation (1).

3. A reinforced concrete thermal pile for preventing frozen soil from melting according to claim 1, characterized in that, The condensation section of the heat pipe (3) is inclined upward away from the concrete pile foundation (1) and arranged above the concrete pile foundation (1).

4. A reinforced concrete thermal pile for preventing frozen soil from melting according to claim 1, characterized in that, The heat pipe (3) has at least one evenly distributed circumferentially.

5. A reinforced concrete thermal pile for preventing frozen soil from melting according to claim 1, characterized in that, The heat pipe (3) is fixedly installed inside the steel reinforcement cage (2) through a connecting piece.

6. A reinforced concrete thermal pile for preventing frozen soil from melting according to claim 5, characterized in that, The connecting piece is a hoop, and the hoop is sleeved outside a single steel bar on the heat pipe (3) and the steel reinforcement cage (2) to fix the heat pipe (3) and the steel reinforcement cage (2).

7. A reinforced concrete thermal pile for preventing frozen soil from melting according to claim 5, characterized in that, The connecting piece is a galvanized binding wire, and the galvanized binding wire is cross-bound on a single steel bar on the heat pipe (3) and the steel reinforcement cage (2) to fix the heat pipe (3) and the steel reinforcement cage (2).

8. A reinforced concrete thermal pile for preventing frozen soil from melting according to claim 1, characterized in that, The heat pipe (3) and a single steel bar on the steel reinforcement cage (2) are welded together to fix the heat pipe (3) and the steel reinforcement cage (2).

9. A reinforced concrete thermal pile for preventing frozen soil from melting according to any one of claims 1-8, characterized in that, The diameter of the bottom of the concrete pile foundation (1) gradually increases downward, so as to increase the contact area with the foundation soil.

10. A reinforced concrete thermal pile for preventing frozen soil from melting according to any one of claims 1-8, characterized in that, The steel reinforcement cage (2) includes a dense area and a non-dense area. The dense area is arranged at the top of the concrete pile foundation (1), and the non-dense area is arranged in the middle and bottom of the concrete pile foundation (1).

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