Split type energy pile and construction method thereof

Abstract

The invention discloses a split type energy pile and a construction method thereof. According to the scheme, a corresponding split type heat exchange pipe section is fixedly arranged in a split type reinforcement cage of the split type energy pile; secondly, the split type reinforcement cage is welded on site, and the split type heat exchange pipe sections distributed in the split type reinforcement cage are synchronously welded and communicated; after the heat exchange pipelines are welded, the heat exchange pipes which are welded and communicated are subjected to field pressing and pressure maintaining; and finally, concrete is poured for the welded reinforcement cage, after concrete pouring is completed, the heat exchange pipeline is pressed again, and the heat exchange pipeline is kept in the under-pressure state. The split type energy pile formed on the basis of the scheme is large in embedding depth, high in heat exchange efficiency, stable and reliable, and the problems existing in the prior art can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of resource utilization, and in particular to split-type energy pile technology. Background Art

[0002] The energy pile is a composite structure that combines pile foundation engineering with geothermal energy utilization. By installing heat exchange pipes in the pile foundation, the pile foundation can not only bear the building load but also serve as a heat exchanger for the ground source heat pump system, thereby realizing the utilization of renewable energy.

[0003] With increasing demand for building space and the resulting building volumes growing larger, the piles supporting these structures are also becoming larger in diameter and length. Due to limitations on construction sites and the lifting capacity and range of hoisting equipment, large-diameter and long-length piles are typically spliced ​​on-site.

[0004] The construction of traditional energy piles generally adopts an integrated installation method. There is no pile connection process, and its burial depth is relatively shallow, so the heat exchange performance and heat exchange efficiency are also limited. In conjunction with this, the heat exchange tubes installed in traditional energy piles are generally also installed in an integrated manner. Due to the integrated installation of traditional energy piles, the pile body is relatively short, and the burial depth of the heat exchange tubes is relatively shallow, so its heat exchange performance and thermal efficiency are not high.

[0005] Furthermore, since the existing energy piles are relatively shallow, when burying the pipes in the pile foundation, concrete is directly filled without any treatment of the heat exchange pipes. If the pile foundation is buried too deep, the buried concrete and surrounding soil will affect the integrity and stability of the heat exchange pipes. Summary of the Invention

[0006] In response to the problems existing in the heat exchange performance and reliability of the heat exchange tube setting scheme in the existing energy pile, the purpose of the present invention is to provide a split energy pile, and also to provide a construction method for a split energy pile. The split energy pile formed based on this scheme has a deep burial depth, high heat exchange efficiency and stable reliability, which can effectively overcome the problems existing in the existing technology.

[0007] In order to achieve the above-mentioned purpose, the specific technical solutions and means adopted by the present invention are as follows:

[0008] The first solution: A split energy pile, comprising a plurality of split steel cages, concrete fillers filling and covering the split steel cages, and heat exchange tubes distributed in the energy pile, wherein the heat exchange tubes comprise a plurality of split heat exchange tube sections, and the plurality of split heat exchange tube sections are correspondingly distributed in the plurality of split steel cages. The plurality of split heat exchange tube sections can be simultaneously welded on site when on-site welding is performed between the distributed split steel cages, and can be pressurized and maintained in a pressure-maintaining state after welding and connection; the plurality of split heat exchange tube sections are connected by welding to form a heat exchange pipeline distributed in the energy pile, and the inlet and outlet ends of the heat exchange pipeline are both led out from the top of the energy pile.

[0009] Furthermore, the capacitor sleeves between the split heat exchange tube sections are welded and connected.

[0010] Furthermore, the split heat exchange pipe section is fixed on the longitudinal main reinforcement of the split reinforcement cage.

[0011] Furthermore, the heat exchange pipelines are distributed in the energy pile in a "U" shape, a "W" shape, a parallel "U" shape or a parallel "W" shape.

[0012] The second solution: a split energy pile construction method, the construction method comprising:

[0013] A corresponding split heat exchange pipe section is fixedly arranged in the split steel cage of the split energy pile;

[0014] Weld the split steel cage on site and simultaneously weld and connect the split heat exchange pipe sections distributed in the split steel cage;

[0015] After the heat exchange pipes are welded, the welded heat exchange pipes are pressurized and pressure maintained on site;

[0016] Concrete is poured for the welded steel cage. After the concrete pouring is completed, the heat exchange pipeline is pressurized again and the heat exchange pipeline is kept under pressure.

[0017] Furthermore, in the construction method, the split heat exchange pipe sections are welded and connected through the electric fusion sleeve, the split heat exchange pipe sections to be welded are respectively inserted into the two ends of the electric fusion sleeve, and the heating coil in the electric fusion sleeve is energized to heat the inner wall of the electric fusion sleeve and the outer wall of the heat exchange pipe inserted into the electric fusion sleeve until the inner wall of the sleeve and the outer wall of the heat exchange pipe are melted, and the melted sleeve and the heat exchange pipe are thermally connected.

[0018] Furthermore, the split-type heat exchange pipe section includes a plurality of straight-section heat exchange pipe sections and a plurality of non-straight-section heat exchange pipe sections.

[0019] With respect to the prior art, the solution provided by the present invention has the following beneficial effects:

[0020] (1) The present invention innovatively adopts a split energy pile structure to match the split heat exchange pipe to effectively solve the problem of low heat exchange performance in existing energy piles. The split energy pile structure can make the pile body longer, so that more shallow geothermal energy can be obtained. On this basis, the on-site split pile connection scheme and the matching extended heat exchange pipe welding connection scheme are further adopted to effectively overcome the pile connection problem of super-long piles, and eliminate the restrictions of super-long piles on the construction site and hoisting technology. At the same time, the buried depth of the heat exchange pipe is increased, thereby improving the heat exchange efficiency of the entire energy pile.

[0021] (2) In the solution of the present invention, for the heat exchange tubes, a split heat exchange tube section is used in conjunction with an on-site split pile connection solution of a split energy pile structure to achieve on-site synchronous welding connection, thereby solving the problem of connecting the heat exchange tubes in the super-long piles, and the welded heat exchange tubes are pressurized and pressure-maintained before concrete pouring, so that the heat exchange tubes are always kept under pressure during the entire concrete pouring process of the energy pile, thereby ensuring the safe and reliable operation of the heat exchange pipelines in the pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 The structure of the split steel cage and heat exchange tubes of the split energy pile in the present invention;

[0024] Figure 2 A cross-sectional diagram illustrating the cooperation between the heat exchange tube and the steel cage in the present invention;

[0025] Figure 3 An example longitudinal cross-section diagram of the heat exchange tubes fixed to the longitudinal main reinforcement in the reinforcement cage in the present invention;

[0026] Figure 4 An example of a transverse cross-section of the heat exchange tubes fixed to the longitudinal main reinforcement in the reinforcement cage in the present invention.

[0027] The following is a description of the components in the accompanying drawings:

[0028] 1-rebar cage, 11-upper half of the rebar cage, 12-lower half of the rebar cage, 13-longitudinal main bars, 14-stirrups, 15-tie wires;

[0029] 2-heat exchange tube, 21-first heat exchange tube section, 22-second heat exchange tube section. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0031] In response to the problems existing in the existing energy piles that adopt an integrated structure, the present invention provides a split energy pile solution. The split energy pile makes the pile body longer, so that more shallow geothermal energy can be obtained. At the same time, the split heat exchange pipe structure is used so that the heat exchange pipe is welded synchronously with the split energy pile during the on-site pile connection construction, so that the length of the heat exchange pipe is no longer limited by the length of the pile body, thereby ensuring the heat exchange performance of the energy pile. The welded heat exchange pipe is pressurized on site. During the process of pouring concrete into the pile body, the heat exchange pipe is always in a pressure-maintaining state until the heat exchange pipe is led out of the pile body at a later stage, thereby effectively solving the problems of insufficient heat exchange efficiency caused by insufficient length of the traditional pile body, as well as the possible damage to the heat exchange pipe and low construction efficiency caused by directly casting the pile body.

[0032] The split energy pile provided by the present invention is mainly composed of a plurality of split steel cages, concrete fillers filling and covering the split steel cages, and heat exchange pipes distributed in the energy pile.

[0033] Among them, several split steel cages and concrete fillers filling and covering the split steel cages cooperate to form the pile body structure of the split energy pile, and the heat exchange pipes distributed in the energy pile constitute the heat exchange components of the split energy pile.

[0034] This solution abandons the integrated steel cage and uses several split steel cages for on-site welding and assembly to form a longer pile body, thereby increasing the buried depth of the corresponding heat exchange pipes in the pile body to improve the heat exchange performance of the energy pile.

[0035] See also Figure 1 In this solution, the steel cage 1 of the split energy pile is composed of several split steel cages 11, 12, etc.

[0036] Here, the split steel cages 11 and 12 are respectively composed of a plurality of longitudinal bars and stirrups. The specific structure is not limited here and can be determined according to actual needs.

[0037] The split steel cages 11 and 12 are directly welded at the construction site, that is, on-site split pile connection is performed, which effectively improves the efficiency of super-long pile construction.

[0038] In order to adapt to the split pile connection structure in which the split steel cage is welded on-site in this split energy pile, the heat exchange tube also adopts a split component structure, and cooperates with the split pile connection scheme in which the split steel cage is welded on-site in the split energy pile. The heat exchange tube is arranged to be able to be welded and connected on-site simultaneously with the welding and splicing of the split steel cage on-site, thereby forming a growing heat exchange pipeline in the pile body of the split energy pile, thereby increasing the buried depth of the heat exchange tube in the pile body and improving the heat exchange performance of the energy pile.

[0039] See further Figure 2 The heat exchange tube 2 in this solution includes several split heat exchange tube sections 21 and 22. The several split heat exchange tube sections 21 and 22 are correspondingly distributed in several split steel cages 11 and 12. At the same time, the several split heat exchange tube sections can be welded on site when they are welded on site between the distributed split steel cages. In this way, after the welding and connection between all the split steel cages are completed, all the split heat exchange tube sections will be connected by welding to form a heat exchange pipeline distributed in the energy pile steel cage, and the inlet and outlet ends of the heat exchange pipeline are both led out from the top of the energy pile.

[0040] Furthermore, in this solution, after the split heat exchange pipe sections 21 and 22 are welded together on site, the welded heat exchange pipe structure will be pressurized and maintained under pressure to check the watertightness of the welded heat exchange pipe structure and whether there is a risk of leakage after welding.

[0041] As an example, this solution uses a pressure test device to test a welded heat exchange tube structure. The pressure test device is connected to one port of the welded heat exchange tube structure, and the other end of the heat exchange tube structure is connected to a pressure gauge. A certain pressure of pressurized gas is then injected into the heat exchange tube through the pressure test device, and the pressure drop per unit time is read on the pressure gauge to determine the watertightness of the welded heat exchange tube structure and whether there is any risk of leakage after welding.

[0042] It should be noted here that after pressurizing the welded heat exchange pipeline, the pressure needs to be maintained until the concrete pouring and solidification of the pile body is completed, that is, to achieve pressurized pouring of the heat exchange tube, so as to avoid the pressure of the poured concrete and surrounding soil on the integrity and stability of the heat exchange pipeline due to the increase in the buried depth of the heat exchange tube.

[0043] As a further explanation, in order to improve the efficiency and reliability of on-site welding and connection of the split heat exchange tubes in this solution, electric fusion sleeves are used to weld and connect the split heat exchange tubes on-site.

[0044] The electric fusion sleeve here is specifically composed of a sleeve body and a heating coil arranged in the side wall of the sleeve body. The inner wall of the sleeve body here is an inner wall layer made of the same material as the heat exchange tube, which can be heated and melted by the heating coil.

[0045] Furthermore, a corresponding hot melt pin angle is provided in the sleeve body, and the hot melt pin angle is adapted to the molten state of the inner wall of the sleeve body. When the inner wall of the sleeve body is in a solid state, the hot melt pin angle is integrally bound and embedded in the sleeve body. When the inner wall of the sleeve body is in a hot melt state, the hot melt pin angle will be able to break free from the constraint and pop out of the sleeve body.

[0046] The two ends of the electric fusion sleeve thus constructed are mutually connected and are adapted to the heat exchange tube.

[0047] When using this electric fusion sleeve to weld and connect split heat exchange tubes on site, the split heat exchange tubes to be connected are respectively inserted into the two ends of the electric fusion sleeve; then the heat coil in the electric fusion sleeve is conductively heated until the inner wall of the electric fusion sleeve and the outer wall of the heat exchange tube are melted, at which time the melted sleeve and the heat exchange tube are thermally connected; when the hot melt pin corner of the electric fusion sleeve pops out, it indicates that the heat exchange tubes have been connected.

[0048] As an example, the electric fusion time is set to 1 minute. After the fusion is completed, the needle angle of the electric fusion sleeve pops out. At this time, the entire pipeline is pressurized to check whether the pressure in the pipe is stable. By controlling the fusion time and the pop-up of the fusion needle angle, the fusion quality of the heat exchange pipeline can be controlled.

[0049] As a further supplementary explanation, in actual application, the length of the electric fusion sleeve can be increased according to actual site requirements, so that two heat exchange tube interfaces that are relatively far apart can be directly connected without the need for secondary connection, thereby improving efficiency.

[0050] Furthermore, in this solution, the heat exchange tubes 2 formed by welding all the separate heat exchange tube sections 21 and 22 can be distributed in the energy pile steel cage in various forms to achieve maximum heat exchange efficiency.

[0051] For example, the heat exchange tubes formed in the energy pile can be distributed in a "U" shape, a "W" shape, a parallel "U" shape, or a parallel "W" shape. Other shapes are also possible as needed.

[0052] Furthermore, after completing the welding of the split steel cage and the simultaneous welding and connection of the split heat exchange tubes on site, this solution pours slow-setting soil filler into the formed steel cage and the heat exchange tubes distributed inside it while the heat exchange tubes are under pressure. After the concrete solidifies, a split energy pile is formed.

[0053] This plan will once again conduct a pressure test on the heat exchange pipeline in the energy pile after the pile concrete solidifies to ensure the safe and reliable operation of the heat exchange pipeline in the pile.

[0054] From the above, it can be seen that the split energy pile provided by the present invention will have the following advantages:

[0055] (1) It can improve the heat exchange performance of the energy pile. The split energy pile adopts a heat exchange pipeline solution that matches the split pile, which increases the buried depth of the heat exchange pipeline, thereby improving the heat exchange performance of the energy pile.

[0056] (2) To achieve pressure-maintained docking of the heat exchange pipeline, this split energy pile adopts a capacitor sleeve with an effective welding control solution to achieve fast and stable welding connection between the heat exchange pipes. Finally, the water tightness of the entire heat exchange pipeline is checked by pressure testing, thus achieving pressure-maintained docking of the heat exchange pipeline.

[0057] (3) To ensure the safety and reliability of the heat exchange pipeline, the heat exchange pipe in this split energy pile is pressurized and maintained before the pile is formed, so that the heat exchange pipe is in a long-term pressurized state to ensure the safe and reliable operation of the heat exchange pipe in the pile body.

[0058] With respect to the split-type energy pile provided by the present invention, the specific implementation scheme thereof is described below by way of example.

[0059] Combine Figure 1 As shown, in this example, the construction of split energy piles is mainly achieved through the following steps:

[0060] S1: According to the technical requirements of split energy piles, the steel bars of the split energy piles are processed.

[0061] In this example, the steel cage 1 of the split energy pile is specifically divided into a split upper steel cage 11 and a lower steel cage 12, wherein the upper steel cage 11 and the lower steel cage 12 are respectively composed of a plurality of longitudinal main bars 13 and a plurality of stirrups 14. Figure 2 As shown, the specific structure is not described here in detail.

[0062] S2: According to the structure of the split steel cage in the split energy pile, corresponding split heat exchange pipe sections are provided, and the split heat exchange pipe sections are fixed in the split steel cage of the split energy pile.

[0063] The steel cage 1 of the split energy pile in this example is specifically divided into a split upper half steel cage 11 and a split lower half steel cage 12 , and the split heat exchange pipe section 2 here is specifically configured into a plurality of first split heat exchange pipe sections 21 and a plurality of second split heat exchange pipe sections 22 .

[0064] The first split heat exchange tube section 21 corresponds to the upper half of the steel cage 11 , and adopts a long straight section structure as a whole, and its length corresponds to the axial length of the upper half of the steel cage 11 .

[0065] The second split heat exchange tube section 22 corresponds to the lower half of the steel cage 12 , and adopts a U-shaped section structure as a whole, and its length corresponds to the axial length of the lower half of the steel cage 12 .

[0066] On this basis, the first split heat exchange pipe section 21 of the long straight section and the second split heat exchange pipe section 22 of the U-shaped section structure are configured in a ratio of 2:1.

[0067] Furthermore, after the upper half of the steel cage 11 is formed, the first split heat exchange pipe sections 21 of the plurality of long straight sections are fixed in the upper half of the steel cage 11. Figures 2 to 4 As shown, each first split heat exchange pipe section 21 is respectively inserted into the interior of the upper half steel cage 11 along the axial direction of the upper half steel cage 11, and is fixed to the longitudinal main reinforcement 13 in the upper half steel cage 11 by the binding wire 15; at the same time, the first split heat exchange pipe sections 21 are equidistantly distributed along the circumferential direction of the inner side of the upper half steel cage 11.

[0068] After the lower half of the steel cage 12 is formed, the second split heat exchange pipe sections 22 of the U-shaped structure are fixed in the lower half of the steel cage 12 corresponding to the first split heat exchange pipe sections 21 in the upper half of the steel cage 11. Figure 2 and Figure 3 As shown, each second split heat exchange pipe segment 22 is respectively inserted into the interior of the lower half steel cage 12 along the axial direction of the lower half steel cage 12, and the two straight portions in each second split heat exchange pipe segment 22 are respectively fixed to the longitudinal main reinforcement 13 in the upper half steel cage 11 by the binding wire 15; at the same time, the straight portions in each second split heat exchange pipe segment 22 are equidistantly distributed along the circumferential direction of the inner side of the lower half steel cage 12, and correspond to the first split heat exchange pipe segments 21 in the upper half steel cage 11.

[0069] S3: After the pile foundation is bored on site, the lower half of the steel cage 12 is placed first, and then the upper half of the steel cage 11 is hoisted, and the upper and lower half steel cages are welded together on site.

[0070] At the same time, during the welding of the steel cage, the first split heat exchange pipe section 21 in the upper half steel cage 11 and the corresponding second split heat exchange pipe section 22 in the lower half steel cage 12 are simultaneously welded and connected through the electric melting sleeve.

[0071] Insert the first split heat exchange tube section 21 in the upper half of the steel cage 11 and the corresponding second split heat exchange tube section 22 in the lower half of the steel cage 12 into the two ends of the electric fusion sleeve respectively; then conduct heat to the heat coil in the electric fusion sleeve, and set the electric fusion time to 1 minute. After the fusion is completed, the needle corner of the electric fusion sleeve pops out, thereby confirming that the heat exchange tube docking is completed.

[0072] S4: After the heat exchange pipeline is welded, the welded heat exchange pipeline is pressurized on site and the pressure is maintained to check the watertightness of the entire heat exchange pipeline and whether there is a risk of leakage after welding.

[0073] Specifically, one end of the heat exchange pipeline formed by welding is connected to the pressure testing equipment, and the other end is connected to the pressure gauge. At that time, pressurized gas of a certain pressure is injected into the heat exchange pipe through the pressure testing equipment, and the pressure drop value per unit time is read through the pressure gauge connected to the other end to ensure that the heat exchange pipeline in the pile body is in good connection condition.

[0074] S5: After checking that all heat exchange pipelines are airtight, the welded steel cage can be lowered. During this process, the heat exchange pipelines are always in a pressurized and pressure-maintaining state.

[0075] S6: After the entire steel cage is lowered to the preset position, concrete pouring begins. During this process, the heat exchange pipeline is always in a pressurized and pressure-maintaining state;

[0076] After the concrete pouring is completed and before the pile is formed, the heat exchange pipe is pressurized again and the pressure is maintained, so that the heat exchange pipe is under pressure for a long time to ensure the safe and reliable operation of the heat exchange pipe in the pile body.

[0077] As can be seen from the above example, the solution provided by the present invention has the following characteristics compared with the prior art:

[0078] (1) The heat exchange pipeline of the existing energy pile is usually limited by the length of the pile body, and the heat exchange performance is also limited at this time; the solution of the present invention is innovative in that a split pile body structure is matched with a split heat exchange pipeline, and the two are synchronously docked on site, so that the length of the heat exchange pipeline is no longer limited by the length of the pile body, thereby ensuring the heat exchange performance of the energy pile.

[0079] (2) The present invention adopts a capacitor sleeve connection. By controlling the electric fusion time and observing whether the pins of the electric fusion sleeve are raised, it is judged whether the fusion is successful. Finally, the water tightness of the entire heat exchange pipeline is checked by pressure testing, thereby achieving pressure-maintaining docking of the heat exchange pipeline.

[0080] (3) The solution of the present invention is that the heat exchange pipe needs to be buried deeper with the split pile. The concrete received by the heat exchange pipe has a relatively high pressure on the soil around the pile. Therefore, before the pile is formed, the heat exchange pipe is pressurized and maintained under pressure, so that the heat exchange pipe is in a long-term pressurized state to ensure that the heat exchange pipe in the pile can operate safely and reliably.

[0081] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A split energy pile, comprising a plurality of split steel cages, concrete fillers filling and covering the split steel cages, and heat exchange tubes distributed in the energy pile, characterized in that: The heat exchange tube includes a plurality of split heat exchange tube sections, and the plurality of split heat exchange tube sections are correspondingly distributed in a plurality of split steel cages. The plurality of split heat exchange tube sections can be simultaneously welded on site when on-site welding is performed between the distributed split steel cages, and pressurized and maintained in a pressure-maintaining state after welding and connecting. The plurality of split heat exchange tube sections are connected by welding to form a heat exchange pipeline in a distributed energy pile, and the inlet and outlet ends of the heat exchange pipeline are both led out from the top of the energy pile.

2. The split energy pile according to claim 1, characterized in that: The capacitor sleeves between the split heat exchange tube sections are welded and connected.

3. The split energy pile according to claim 1, characterized in that: The split heat exchange pipe section is fixed on the longitudinal main reinforcement of the split reinforcement cage.

4. The split energy pile according to claim 1, characterized in that: The heat exchange pipelines are distributed in the energy pile in a "U" shape, a "W" shape, a parallel "U" shape or a parallel "W" shape.

5. A split energy pile construction method, characterized in that: The construction method comprises: A corresponding split heat exchange pipe section is fixedly arranged in the split steel cage of the split energy pile; Weld the split steel cage on site and simultaneously weld and connect the split heat exchange pipe sections distributed in the split steel cage; After the heat exchange pipes are welded, the welded heat exchange pipes are pressurized and pressure maintained on site; Concrete is poured for the welded steel cage. After the concrete pouring is completed, the heat exchange pipeline is pressurized again and the heat exchange pipeline is kept under pressure.

6. The split energy pile construction method according to claim 5, characterized in that: In the construction method, the split heat exchange pipe sections are welded and connected through an electric fusion sleeve, the split heat exchange pipe sections to be welded are respectively inserted into the two ends of the electric fusion sleeve, and the heating coil in the electric fusion sleeve is energized to heat the inner wall of the electric fusion sleeve and the outer wall of the heat exchange pipe inserted into the electric fusion sleeve until the inner wall of the sleeve and the outer wall of the heat exchange pipe are melted, and the melted sleeve and the heat exchange pipe are thermally connected.

7. The split energy pile construction method according to claim 5, characterized in that: The split heat exchange pipe section includes a plurality of straight heat exchange pipe sections and a plurality of non-straight heat exchange pipe sections.

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