Ground source heat pump heat exchange pipe pile

Abstract

The utility model belongs to the technical field of underground heat exchange, and particularly relates to a ground source heat pump heat exchange pipe pile which comprises a structural framework composed of longitudinal structural steel bars and spiral stirrups, a heat exchange coil pipe fixed to the structural framework and a concrete pipe body wrapping the structural framework and the heat exchange coil pipe. Preformed holes are evenly formed in the pipe wall of the concrete pipe body, after the prefabricated pipe pile is pressed into the ground, cement paste is poured into gravel around the pipe pile through the preformed holes, gravel concrete is formed, the heat conductivity coefficient, the heat capacity and the mechanical property of the gravel concrete are improved, and the heat conductivity coefficient, the heat capacity and the mechanical property of the gravel concrete are improved. The heat storage capacity of an underground heat exchange field formed by the pile groups is improved, and the heat storage problem in cold regions is solved; and meanwhile, the structural bearing capacity of the structural heat exchange pile can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchange technical field especially relates to a ground source heat pump heat exchange pipe pile. BACKGROUND

[0002] The energy pile has unique advantages as a new heat exchange device combining a structure foundation and a ground source heat pump system. SUMMARY

[0003] The utility model provides a ground source heat pump heat exchange pipe pile, solved the low bearing capacity of gravel geology, silt geology, soil geology structure in the shortcoming of prior art prefabricated pipe pile technology, the problem of poor heat storage capacity of geological conditions.

[0004] The utility model provides the following technical scheme:

[0005] A ground source heat pump heat exchange pipe pile, including the structural framework of longitudinal structure steel bar, spiral stirrup and the heat exchange coil fixed on the structural framework, the concrete pipe body covered in the structural framework, heat exchange coil outside, the reserved hole is provided on the concrete pipe body, and the reserved hole provides necessary technical conditions for increasing cement mortar grouting.

[0006] In a possible implementation, the coil body is circular or spiral.

[0007] In a possible implementation, the heat exchange coil is composed of a water inlet, a water inlet coil section, a return water vertical pipe section and a water outlet, wherein the water inlet coil section is spirally fixed on the structural framework, and the return water vertical pipe section passes through the structural framework in the vertical direction.

[0008] In a possible implementation, the heat exchange coil is formed by winding a PE polyethylene pipe.

[0009] In a possible implementation, the water inlet and the water outlet are outlet sections of the heat exchange coil and extend to the pile top column cap at the top of the heat exchange pipe pile.

[0010] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the utility model.

[0011] In the utility model, the reserved hole can significantly improve the bearing capacity of the prefabricated pipe pile through subsequent grouting construction process, improve the geological stability and integrity of the section covered by the pile group, and improve the heat storage performance of the land covered by the pile group.

[0012] Under the silt geological conditions, the prefabricated pipe pile with the hole in the pile wall and the prefabricated pipe pile with the buried pipe can replace the silt water around the pipe pile by the reserved hole on the pipe wall with high pressure cement slurry, form the expanded cement concrete block, increase the volume of the homogeneous heat exchange field, expand the heat storage capacity, and meanwhile, can improve the bearing capacity of the single pile and the mechanical properties of the underground structure system.

[0013] Under the silt geological conditions, the prefabricated pipe pile with the hole in the pile wall and the prefabricated pipe pile with the buried pipe can replace the silt water around the pipe pile by the reserved hole on the pipe wall with high pressure cement slurry, form the expanded cement concrete block, increase the volume of the homogeneous heat exchange field, expand the heat storage capacity, and meanwhile, can improve the bearing capacity of the single pile and the mechanical properties of the underground structure system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A concrete pipe body structure schematic view of the ground source heat pump heat exchange pipe pile provided by the embodiment of the present application is shown in the figure.

[0015] Figure 2 A concrete pipe body cross section structure schematic view of the ground source heat pump heat exchange pipe pile provided by the embodiment of the present application is shown in the figure.

[0016] Figure 3 A concrete pipe body partial enlarged schematic view of the ground source heat pump heat exchange pipe pile provided by the embodiment of the present application is shown in the figure.

[0017] Figure 4 A structure schematic view of the ground source heat pump heat exchange pipe pile provided by the embodiment of the present application is shown in the figure.

[0018] Figure 5 A cross section structure schematic view of the ground source heat pump heat exchange pipe pile provided by the embodiment of the present application is shown in the figure. Figure 4

[0019] A partial enlarged schematic view of the ground source heat pump heat exchange pipe pile provided by the embodiment of the present application is shown in the figure. Figure 6 Figure 4 A partial enlarged schematic view of the ground source heat pump heat exchange pipe pile provided by the embodiment of the present application is shown in the figure.

[0020] Figure 7 Figure 4

[0021] REFERENCE SIGNS

[0022] 1, concrete pipe body; 2, pile core; 3, reserved hole; 4, conical steel pile cap; 5, water inlet coil section; 6, water return vertical pipe section; 7, water return port; 8, water inlet port; DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described below in combination with the drawings in the embodiments of the present application.

[0024] ​​​In the description of the embodiments of the utility model, need explanation, unless another explicit provision and limitation, term, " connection ", " install " should do broad sense understanding, for example, " connection " can be detachably connected, also can be unremovably connected, can be direct connection, also can be indirectly connected through intermediate medium. In addition " communication " can be direct communication, also can be indirectly communicated through intermediate medium. Wherein, " fixed " is to connect each other and the relative position relation of connection is invariable. The orientation language mentioned in the embodiment of the utility model, for example, " inside ", " outside ", " top ", " bottom " etc. are only the direction of reference drawing, therefore, the orientation language used is for better, more clearly illustrate and understand the embodiment of the utility new, and is not indicate or imply the device or element indicated must have specific orientation, with specific orientation structure and operation, therefore, can not be understood as the restriction of the embodiment of the utility model.

[0025] In the embodiments of the utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features.

[0026] In the embodiments of the utility model, " and / or " is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the associated objects before and after.

[0027] Therefore, the application provides a ground source heat pump heat exchange pipe pile, which can not only form a bearing section at the lower part of the heat exchange pipe pile, but also form a bearing section at the side part of the heat exchange pipe pile, thereby improving the single-pile bearing capacity of the heat exchange pipe pile and improving the diffusion efficiency of the concrete.

[0028] Specifically, reference Figures 1-7The utility model provides a kind of ground source heat pump heat exchange pipe pile, including longitudinal structural reinforcement, spiral stirrup structure framework, as the main force component of heat exchange pipe pile, longitudinal structural reinforcement is responsible for bearing the axial load and bending moment of pile body, the specification and quantity of reinforcement need to be calculated and determined according to the design load of pile and geological condition, spiral stirrup is one of main component materials in constraint concrete, it is arranged in spiral form along the longitudinal direction of pile body, and longitudinal structural reinforcement is tightly tied together, spiral stirrup not only improves the shear capacity and overall stability of pile body, but also significantly enhances the bearing capacity and anti-damage capacity of component through its continuous overall characteristics, to achieve the anti-seismic effect of ordinary concrete component, the diameter and spacing of spiral stirrup need to be calculated and determined according to design requirements, concrete strength grade and other factors of pile, and fixed on structure framework Heat exchange coil, heat exchange pipe is arranged in longitudinal direction inside pile body, to form continuous heat exchange channel, for heat exchange of ground source heat pump system, the diameter and quantity of heat exchange pipe need to be calculated and determined according to design heat load, geological condition and other factors of pile, concrete pipe body 1 covered in structure framework, heat exchange coil outside, concrete is the main component of heat exchange pipe pile, it is wrapped in steel reinforcement framework and heat exchange pipe outside, to form solid pile body, the strength grade of concrete needs to be selected according to design requirements, geological condition and other factors of pile, and reserved hole 3 is arranged on concrete pipe body 1, by arranging heat exchange pipe inside pile body, direct utilization of geothermal resources is realized, and stable heat source or cold source is provided for ground source heat pump system, compared with traditional ground source heat pump system, heat exchange pipe pile does not need additional drilling and pipe laying process, reduces construction difficulty and cost.

[0029] Further, the reserved hole 3 arranged on the side wall of the concrete pipe body 1 is vertically oriented towards the axis of the pipe pile and is arranged at intervals along the length direction of the pipe pile. Multiple reserved holes 3 are arranged at the same height and surround the axis. By arranging the reserved hole 3 on the side wall, the concrete can spread to the outside of the side wall of the pipe pile from the reserved hole 3 on the side wall when pouring the pile core 2, thereby improving the bonding strength between the pipe pile and the soil layer.

[0030] Specifically, the wall thickness of the concrete pipe pile is customized according to engineering needs. The height of the concrete pipe pile is generally set to 10-15 m. The diameter of the reserved pile core 2 of the concrete pipe pile is greater than or equal to 150 mm. The first row of reserved holes 3 is arranged at the lower part of the concrete pipe body 1, 1000 mm away from the end. The first row of reserved holes 3 is evenly distributed by 6 or 8. The reserved holes 3 surround the axis of the pipe pile. The diameter of the reserved holes 3 is 15-20 mm. A total of 10 layers of reserved holes 3 are arranged along the pile body of the pipe pile. The interval height of the reserved holes 3 in each layer is 1 m. A conical steel pile cap 4 is fixed at the lower end of the concrete pipe pile. The conical angle is less than 90º, so as to reduce the resistance of static pressure into the ground and improve the construction speed.

[0031] Further, the heat exchange coil is composed of a water inlet 8, a water inlet coil section 5, a water return vertical pipe section 6 and a water return outlet 7, the water inlet 8 is the starting point of the heat exchange coil, responsible for introducing cooling water or heating water into the heat exchange coil system, wherein the water inlet coil section 5 is spirally fixed on the structural framework, increasing the heat exchange area and improving the heat exchange efficiency, wherein the water return vertical pipe section 6 passes through the structural framework in the vertical direction, introducing the water after heat exchange back to the ground source heat pump system for reheating circulation, the spirally coiled water inlet coil section 5 increases the contact area with the surrounding soil, making the heat exchange more sufficient and efficient. At the same time, the design of the vertical pipe section also helps to reduce the water flow resistance and improve the heat exchange speed.

[0032] Further, the heat exchange coil is integrally formed by PE polyethylene, having excellent corrosion resistance, excellent heat exchange performance and good processing performance.

[0033] Further, the water inlet 8 and the water return outlet 7 are the lead-out sections of the heat exchange coil, both extending to the pile top column cap at the top of the heat exchange pipe pile, facilitating the connection with the circulating water pump and the water return pipeline of the ground source heat pump system, and also facilitating the construction process.

[0034] Specifically, the extension height of the water inlet 8 and the water return outlet 7 is greater than 200mm, and the coil length and arrangement spacing need to be calculated.

[0035] In the above embodiment, by providing the reserved hole 3 to provide a fluid channel for the high-pressure cement slurry process, the friction between the prefabricated pipe pile 2 and the surrounding geology and the single pile bearing capacity can be significantly improved, and the heat exchange capacity of the heat exchange pipe pile and the heat storage capacity of the formed gravel concrete can also be improved.

[0036] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application; in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A ground source heat pump heat exchange pipe pile, comprising a structural frame composed of longitudinal structural steel bars and spiral stirrups, a heat exchange coil fixed on the structural frame, and a concrete pipe body covering the structural frame and the heat exchange coil, characterized in that, The concrete pipe body has evenly distributed reserved holes on its pipe wall.

2. The ground source heat pump heat exchanger pipe pile according to claim 1, characterized in that, The heat exchange coil consists of an inlet, an inlet coil section, a return water vertical pipe section, and a return water inlet, wherein the inlet coil section is spirally coiled and fixed on the structural frame.

3. The ground source heat pump heat exchanger pipe pile according to claim 2, characterized in that, The heat exchange coil is integrally formed by winding a PE polyethylene coil into a spiral shape.

4. The ground source heat pump heat exchanger pipe pile according to claim 3, characterized in that, The inlet and outlet are the lead-out sections of the heat exchange coil, both extending to the pile cap at the top of the heat exchange tube pile.

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