Heat exchange pipe leading-out structure for energy subway station

Abstract

The utility model discloses a heat exchange pipe leading-out structure for energy subway station, it includes fender pile, crown beam, cushion layer, the fender pile inside pre -buried vertical direction's heat exchange pipe, crown beam is set up in fender pile top, and is tied up and is connected with fender pile pile top reinforcement through reinforced cage, the cushion layer is grouted between fender pile top and crown beam bottom, and is buried with the heat exchange pipe of horizontal arrangement, vertical direction heat exchange pipe is out through the elbow joint horizontal direction's heat exchange pipe in pile top. This scheme can be safe, efficient and lead out the heat exchange pipe in the fender pile of subway station well and can effectively compatible the structure characteristics of fender pile of subway station and the mode of pile top and crown beam connection, do not affect the construction progress of station itself.

Description

Technical Field

[0001] This utility model relates to the field of energy pile construction technology, specifically to a field of heat exchange pipes leading out from the bottom of the energy pile and the crown beam. Background Technology

[0002] Energy piles, commonly used in subway stations, are an emerging technology that combines traditional ground source heat pump technology with the pile foundation structure of subway stations. Heat exchange pipes are buried inside the pile foundation, and heat is exchanged with the surrounding shallow surface soil through circulating fluid. They are mainly used for heating and cooling in subway stations.

[0003] The inlet and outlet of the heat exchange pipes are pre-installed at the top of the energy pile as the main interface for the horizontal connection pipes of the energy pile, which is also the key to connecting the energy pile and the heat pump unit to realize heat transfer. However, at present, energy piles are still in the experimental stage or small-scale demonstration project stage, and have not been used on a large scale in actual projects, especially in subway projects. Considering the actual characteristics of subway construction sites, how to safely and efficiently lead out the heat exchange pipes from the retaining piles of subway stations has become crucial.

[0004] Currently, energy piles are mainly in the experimental research stage, with relatively limited actual engineering applications, primarily concentrated in building construction as pile foundations to bear building loads. Furthermore, existing underground energy structures are still in their infancy and research phase, typically focusing on a single structure such as energy piles, energy foundation slabs, energy tunnels, or energy diaphragm walls. There is currently no experience in connecting these different underground energy structures together.

[0005] Subway retaining piles are an important component of the support system for subway tunnel construction, playing a crucial role in bearing the soil loads on both sides of the station and directly affecting the safety of station construction. Current plans do not include applications for using subway retaining piles as energy piles, nor do they include construction plans for bringing out energy pipes from the subway station retaining piles.

[0006] For example, Chinese patent application CN115652908A discloses an energy support pile system and its construction method. In this method, multiple energy support piles and energy anchors are connected in parallel in the water collection / distribution pipeline inside the cap beam, and inlet / outlet pipelines and connections to heat pump units and air conditioning and heating systems are reserved, thereby realizing modular encapsulation and ensuring that the entire pipeline is free from damage during construction and operation.

[0007] Specifically, the heat exchange tubes are connected and collected through sealing sleeves, waterproof tape, tee joints, water collection pipes, tee joints and interface pipes, and the joints are buried in the soil at the bottom of the crown beam, thus avoiding the joints being wrapped by concrete pouring.

[0008] However, in actual construction, the above plan did not take into account the actual problem that the heat exchanger pipe connectors buried in the soil would be damaged during subsequent construction such as the crown beam. Utility Model Content

[0009] In response to the problem of how to effectively lead heat exchange pipes out from the top of the retaining piles and the bottom of the capping beam in the construction of existing energy-powered subway stations, the purpose of this utility model is to provide a structural solution for leading out heat exchange pipes in energy-powered subway stations. This solution effectively avoids the risk of damaging the heat exchange pipes when breaking the capping beam later, while not affecting the construction progress of the station itself.

[0010] To achieve the above objectives, the technical means employed by this utility model are as follows:

[0011] A heat exchange pipe lead-out structure for an energy-efficient subway station includes retaining piles, a capping beam, and a cushion layer. Vertical heat exchange pipes are pre-embedded inside the retaining piles. The capping beam is located at the top of the retaining piles and is connected to the top reinforcement of the retaining piles via a reinforcing cage. The cushion layer is poured between the top of the retaining piles and the bottom of the capping beam, and horizontally arranged heat exchange pipes are embedded in the cushion layer. The vertical heat exchange pipes are connected to the horizontal heat exchange pipes at the top of the piles via right-angle bends. The horizontal heat exchange pipes extend beyond the width of the capping beam and are embedded within the cushion layer.

[0012] Preferably, the top of the retaining pile is provided with a groove, which extends from the location of the vertical heat exchange pipe toward the back soil side. The length of the groove is greater than the width of the cap beam. The horizontal heat exchange pipe is accommodated in the groove along its length. After the grooves are poured, they form a cushion layer.

[0013] Preferably, the cross-sectional dimensions of the groove are not less than 15cm*15cm.

[0014] Preferably, the horizontal heat exchange tube is fitted with a protective structure on its outer side, the protective structure consisting of an inner layer of rubber and plastic insulation cotton and an outer layer of PVC sleeve.

[0015] Preferably, the ends of the horizontal heat exchange tubes are sealed with caps, which are reinforced by interleaving and winding.

[0016] Preferably, the right-angle elbow and the heat exchange tube are sealed together by welding.

[0017] The structural design for the heat exchange pipes leading out of the energy-efficient subway station provided by this utility model ensures good connection of the heat exchange sleeve by conducting a pressure test after each connection of the heat exchange pipes or the addition of joints. In addition, the use of rubber and plastic insulation cotton, PVC sleeves and pipe caps for protection prevents the heat exchange pipes from being damaged during concrete pouring.

[0018] Secondly, at the point where the heat exchange pipes emerge from the top of the retaining piles, a right-angle bend is used to turn them into horizontal heat exchange pipes, which are then placed in pre-cut grooves. A cushion layer of a certain thickness is pre-cast at the subsequent cap beam location, enclosing the groove containing the heat exchange pipes. This cushion layer forms a protective layer for the heat exchange pipes, preventing damage during the subsequent cap beam pouring and construction.

[0019] In addition, burying the heat exchanger tubes in the cushion layer ensures that the subsequent construction of the crown beam will not be affected by the heat exchanger tubes. Moreover, after the foundation pit is fully excavated, the cushion layer will fall off on its own and expose the heat exchanger tubes. Therefore, the overall construction process and progress will not be delayed due to the introduction and protection of the heat exchanger tubes. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a construction flowchart of the structure for safely leading the heat exchange tubes out from the bottom of the crown beam in this utility model;

[0022] Figure 2 This is an example diagram showing the relative positions of the top of the retaining piles, the capping beam, and the padding layer with embedded heat exchange pipes in a subway station according to this utility model.

[0023] Figure 3 This is a schematic diagram showing the relative positions of the heat exchange pipes after the pile head of the retaining pile is broken in the embodiment of this utility model.

[0024] Figure 4 This is a schematic diagram showing the location of the groove cut at the top of the pile in the embodiment of this utility model;

[0025] Figure 5 This is a schematic diagram showing the position of the heat exchange tube as it turns and exits in the groove during the steps of an embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram of the heat exchange tube embedded in the pad layer in the embodiment of this utility model;

[0027] Figure 7 This is a schematic diagram showing the relative position of the pad with the embedded heat exchange tube and the crown beam in the steps of an embodiment of this utility model.

[0028] 100. Top of retaining pile; 110. Continuous reinforcement bars of retaining pile; 120. Vertical heat exchange pipe at the top of retaining pile.

[0029] 200. Underlayment; 210. Horizontal heat exchange tubes in the underlayment; 211. Right-angle elbow; 212. Pipe cap; 213. PVC pipe; 220. Groove.

[0030] 300. Crown beam. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0032] This utility model addresses the construction process of retaining piles and capping beams for energy-powered subway stations, as well as the subsequent need to remove the capping beams. It provides a structure in which heat exchange pipes are led out from the padding layer at the bottom of the capping beam. This structure can effectively accommodate the structural characteristics of the retaining piles of subway stations and the connection method between the pile top and the capping beam, without affecting the construction process and progress of the station itself.

[0033] Combination Figure 2 As shown, the structure of the heat exchange tube leading out from the padding layer at the bottom of the crown beam provided by this utility model mainly involves retaining piles 100, crown beam 300, padding layer 200, heat exchange tubes, etc.

[0034] Among them, the retaining pile 100 has a vertical heat exchange pipe 120 pre-embedded inside; at the same time, the capping beam 300 is set on the top of the retaining pile 100 and is tied to the top steel bar of the retaining pile through a steel cage; the cushion layer 200 is poured between the top of the retaining pile 100 and the bottom of the capping beam 300, and the cushion layer is embedded with horizontally arranged heat exchange pipes 210.

[0035] Based on this, the vertical heat exchange pipe 120 is connected to the horizontal heat exchange pipe 210 at the top of the pile via a right-angle elbow 211; at the same time, the horizontal heat exchange pipe 210 extends beyond the width of the crown beam and is buried in the cushion layer.

[0036] Regarding the structure of the heat exchange tube extending from the padding layer at the bottom of the crown beam provided in this utility model, the corresponding construction and forming scheme is described in detail below.

[0037] Combination Figure 1 and Figure 2 As shown, the construction and forming process of this lead-out structure includes the following steps:

[0038] Step 1: First, determine the relative positions of the top of the retaining piles 100, the cushion layer 200 with embedded heat exchange pipes, and the capping beam 300 in the subway station.

[0039] Combination Figure 2 As shown, the relative positions of the heat exchange pipe, retaining piles, and crown beam involved in this utility model solution are shown. It includes a crown beam, retaining piles, and a cushion layer. The crown beam is arranged on the top of the retaining piles and runs along the direction of the arrangement of multiple retaining piles. The crown beam at the top of the piles connects all the retaining piles through an internal steel cage, making it an energy support structure that shares the load with the overall frame.

[0040] Furthermore, the capping beam here is a cuboid parallel to the ground and perpendicularly connected to the arranged retaining piles. The length of the capping beam matches the total length formed by the arranged retaining piles, and the cross-section of the capping beam is rectangular. The length of the cross-section matches the diameter of the retaining piles it connects to, while the height of the cross-section is related to the design parameters of the foundation pit depth and the length of the reinforcing bars extending from the top of the retaining piles. The capping beam is fixedly connected to the reinforcing bars extending from the top of the retaining piles after the pile heads are extracted via a reinforcing cage. Then, pouring concrete completes the fixed connection between the capping beam and the retaining piles, forming an integrated frame structure that shares the load with the energy support structure.

[0041] Furthermore, a concrete cushion layer 200 is provided between the bottom 300 of the cap beam and the top 100 of the retaining pile. The cushion layer is embedded with heat exchange pipes led out from the top of the retaining pile. The thickness of the cushion layer will not affect the stability of the support structure formed by the retaining pile and the cap beam.

[0042] Step 2: After the construction of the retaining piles as energy piles is completed, the exposed heat exchange pipes are pressure tested for the first time after the pile heads of the retaining piles are broken.

[0043] As an example, when constructing the retaining piles, the heat exchange pipes are first arranged inside the retaining piles in a predetermined manner. A steel sleeve is pre-fitted around the inlet and outlet of the heat exchange pipes at the pile head before the retaining piles are poured with concrete. When the poured retaining piles are cured and the conditions for breaking the pile head are met, a manual pneumatic hammer is used to remove the reinforcing bars, break the bottom section of the pile head, locate the heat exchange pipes inside the reinforcing bars, and then a steel pipe cutting device that can protect the heat exchange pipes from damage is used to pre-cut the steel sleeves outside the heat exchange pipes. Finally, a crane is used to extract the pile head.

[0044] This step involves removing the heat exchange tubes protected by the steel sleeves of the pile heads after the construction of the retaining piles is completed. The airtightness of the heat exchange tubes is then checked and tested using a pressure test to confirm that the heat exchange tubes inside the retaining piles are undamaged, thus ensuring that the retaining piles can be used normally as energy piles in the future.

[0045] As further explanation, during the pressure test in this step, one end of the heat exchange sleeve formed by welding is connected to the pressure testing equipment, and the other end is connected to a pressure gauge. At that time, pressurized gas at a certain pressure is injected into the heat exchange sleeve through the pressure testing equipment. The pressure drop value of the pressure gauge connected to the other end is read through the pressure gauge per unit time to ensure that the heat exchange sleeve in the pile body is in good connection condition.

[0046] Step 3: After the first pressure test is passed, cut a groove 220 on the top of the broken pile head, cut and turn the heat exchange tube, and place the horizontal heat exchange tube 210 connected by the turn into the groove on the top of the pile.

[0047] This step involves constructing the retaining piles and removing the pile heads. A groove is cut at the top of the broken pile head, starting at the location of the heat exchanger tube inside the pile head. The groove extends towards the back soil side and ends at a certain distance outside the retaining pile. The groove length must be greater than the width of the capping beam, and the height and width of the groove must accommodate the heat exchanger tube. Simultaneously, the heat exchanger tube, having completed its first pressure test, is cut along the top of the pile. The cut point is flush with the bottom of the groove. A right-angle elbow 211 is used to connect the cut heat exchanger tube 120, with the free end of the elbow connected to the horizontal heat exchanger tube 210. This allows the horizontal heat exchanger tube to be placed along the length of the groove, with its free end extending outside the retaining pile. This transforms the heat exchanger tube from a vertical position relative to the capping beam to a horizontal position.

[0048] Step 4: Perform a second pressure test on heat exchange tube 210 after the horizontal heat exchange tubes are connected.

[0049] This step requires that the length of the matching horizontal heat exchange pipe extends beyond the retaining pile and also beyond the width range of the subsequent cap beam construction, that is, outside the width direction of the cap beam concrete.

[0050] This step involves conducting a second pressure test on the entire heat exchanger tube after the horizontal extension connection is completed. The implementation plan for the second pressure test of the heat exchanger tube is as described above and will not be repeated here.

[0051] Step 5: After the second pressure test is passed, protect and maintain the heat exchange tubes.

[0052] This step involves a second pressure test on the heat exchange tubes. After the pressure test, the horizontally extended heat exchange tubes placed in the groove are protected, and tube caps are used to seal the ends of the heat exchange tubes.

[0053] This step involves protecting the horizontally extended heat exchanger tube using rubber and plastic insulation cotton and a PVC sleeve. The rubber and plastic insulation cotton is placed entirely inside the PVC sleeve, forming a through hole that allows the heat exchanger tube to pass through. Based on this, the PVC sleeve containing the rubber and plastic insulation cotton is fitted onto the heat exchanger tube. The rubber and plastic insulation cotton inside the PVC sleeve directly covers the heat exchanger tube, providing insulation and buffer protection. The PVC sleeve on the outside, based on its own strength, protects the inner rubber and plastic insulation cotton and the heat exchanger tube.

[0054] Step 6: Pour the cut groove 220 into which the heat exchange tube 210 is embedded to form the cushion layer 200 at the bottom of the crown beam.

[0055] After confirming that all heat exchanger tubes within the 220mm groove are properly connected and sealed, pour the groove containing the heat exchanger tubes. The pouring area should cover the base area of ​​the subsequent cap beam pouring, forming a cushion layer of a certain thickness at the bottom of the cap beam. During pouring, the concrete will cover the gaps in the groove, allowing the heat exchanger tubes with PVC sleeves to be buried within the cushion layer. The pouring of this cushion layer will not affect the subsequent construction and pouring of the retaining piles and cap beam.

[0056] After the 200mm subbase is poured, a 300mm steel cage for the capping beam is erected on top of the subbase. After the pile heads are pulled out, the vertical steel bars 110 left at the top of the retaining piles extend into the 300mm steel cage for the capping beam and are tied and fixed to it, providing stability for the connection between the capping beam and the retaining piles after subsequent pouring.

[0057] The pouring of the foundation layer here will not affect the construction efficiency of the original subway station, and at the same time can effectively avoid the risk of damaging the heat exchange tubes when breaking the crown beam later.

[0058] The following details the specific implementation process of the heat exchange tube leading out from the bottom of the crown beam structure based on the above, in conjunction with the construction of the energy subway station.

[0059] Based on the above-mentioned method of leading the heat exchange tube from the bottom of the cap beam, when cooperating with the construction of the energy subway station, after the first pressure test is performed on the exposed heat exchange tube after the pile head is broken, that is, after the pressure test of the heat exchange tube inside the retaining pile is passed, a groove is cut at the top of the retaining pile after the pile head is broken, and the heat exchange tube is cut off and turned, and the horizontal heat exchange tube 210 connected by the turn is placed in the groove 220 at the top of the pile.

[0060] Specifically, for the construction of the groove cutting at the top of the retaining pile after the pile head has been broken, the starting point of the groove is set at the location of the heat exchange pipe vertically inside the pile head, the length of the groove extends towards the back soil side and the end point is at a certain distance outside the retaining pile. Here, the groove length must be greater than the cross-sectional length parameter of the cap beam, and the height and width of the groove can accommodate the placement of the heat exchange pipe.

[0061] Specifically, each retaining pile has two protruding heat exchange pipe inlet and outlet ports, connected by two right-angle elbows and two pre-reserved length connecting pipes. For example... Figure 3 As shown, the heat exchange tube 120 extending vertically from the retaining pile is first cut off along the bottom of the groove. The cut heat exchange tube is then connected using a right-angle elbow 211. At the same time, the free end of the right-angle elbow is connected to the horizontal heat exchange tube 210, so that the horizontal heat exchange tube is placed along the length of the groove and the free end of the horizontal heat exchange tube extends outside the retaining pile. This changes the heat exchange tube from its original vertical state relative to the cap beam to a horizontal state.

[0062] Specifically, the horizontal heat exchange tube 210 placed in the groove and the vertical heat exchange tube 120 in the retaining pile are heat exchange tubes of the same specifications.

[0063] Based on this, a second pressure test was conducted on the heat exchange tubes that had completed horizontal turning and horizontal extension. After the test was completed, the protruding ends of the horizontally extended heat exchange tubes were sealed with PVC sleeves with built-in rubber and plastic insulation cotton and tape. That is, the PVC sleeves with built-in rubber and plastic insulation cotton were completely fitted over the connection ends, and the ends of the PVC sleeves were sealed with pipe caps 212. Multiple layers of tape were wrapped around the sleeves for sealing and protection, thereby preventing concrete from entering and damaging the foundation layer during pouring.

[0064] Here, the direction of the heat exchange tube is changed by a right-angle bend, the reserved length of the connecting pipe matches the length of the groove, and the reserved length of the connecting pipe extends from the end of the retaining pile to the outside of the cap beam casting form.

[0065] Here, heat exchange pipes, which are used in conjunction with right-angle bends for horizontal extension, are drawn out from the cushion layer between the top of the retaining piles and the bottom of the cap beam.

[0066] Based on the diameter of the PVC sleeve containing the heat exchange tube, it can be understood that the width and height of the groove must be adapted to accommodate the PVC tube. The cross-section of the groove can preferably be 15*15cm. 2 A square shape.

[0067] The heat exchanger pipe lead-out structure for energy-efficient subway station construction provided in this utility model has the following technical advantages compared to existing technologies:

[0068] 1. Effectively protects the heat exchange tubes embedded in the padding layer.

[0069] During on-site construction, a pressure test was conducted after each connection or addition of a joint to ensure the heat exchange pipeline was in good working order. Furthermore, heat exchange pipelines in different energy structures were protected with rubber and plastic insulation and PVC sleeves to prevent damage during concrete pouring.

[0070] 2. The heat exchange tubes are embedded in the padding layer at the bottom of the capping beam to prevent damage to the heat exchange tubes when the capping beam is broken later, and to avoid delaying the construction efficiency of the original subway station.

[0071] Where the heat exchange tubes emerge from the top of the retaining piles, a right-angle bend is used to turn them into horizontal heat exchange tubes, which are then placed in pre-cut grooves. A cushion layer of a certain thickness is pre-cast at the location of the subsequent capping beam, so that the groove containing the heat exchange tubes is encased in the cushion layer. This cushion layer forms a protective layer for the heat exchange tubes, protecting them from damage during the subsequent casting of the capping beam and the construction of the capping beam.

[0072] By embedding the heat exchange tubes in the foundation layer, the subsequent construction of the crown beam was not affected by the heat exchange tubes. Moreover, after the foundation pit was fully excavated, the foundation layer fell off on its own and exposed the heat exchange tubes. Therefore, the overall construction process and progress were not delayed due to the exposure and protection of the heat exchange tubes.

[0073] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A heat exchanger pipe lead-out structure for an energy-efficient subway station, comprising retaining piles, a capping beam, and a cushion layer, characterized in that, Vertical heat exchange pipes are pre-embedded inside the retaining piles; the capping beam is set at the top of the retaining piles and is tied to the top reinforcement of the retaining piles through a steel cage; the cushion layer is poured between the top of the retaining piles and the bottom of the capping beam, and horizontally arranged heat exchange pipes are embedded in the cushion layer; the vertical heat exchange pipes are connected to the horizontal heat exchange pipes at the top of the piles through right-angle bends; the horizontal heat exchange pipes extend beyond the width of the capping beam and are embedded in the cushion layer.

2. The heat exchanger pipe lead-out structure for an energy-efficient subway station according to claim 1, characterized in that, The top of the retaining pile is provided with a groove, which extends from the location of the vertical heat exchange pipe to the back soil side. The length of the groove is greater than the width of the cap beam. The horizontal heat exchange pipe is accommodated in the groove along its length. After the grooves are poured, they form the cushion layer at the bottom of the cap beam.

3. The heat exchanger tube lead-out structure for an energy-efficient subway station according to claim 2, characterized in that, The cross-sectional dimensions of the groove are not less than 15cm*15cm.

4. The heat exchanger pipe lead-out structure for an energy-efficient subway station according to claim 1, characterized in that, The horizontal heat exchange tube is fitted with a protective structure, which consists of an inner layer of rubber and plastic insulation cotton and an outer layer of PVC sleeve.

5. The heat exchanger pipe lead-out structure for an energy-efficient subway station according to claim 4, characterized in that, The ends of the horizontal heat exchange tubes are sealed with caps and reinforced with interlocking winding.

6. The heat exchanger tube lead-out structure for an energy-efficient subway station according to claim 1, characterized in that, The right-angle elbow and the heat exchange tube are sealed together by fusion welding.

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