Method for leading out heat exchange pipe from fender post and crown beam in energy subway station construction

Abstract

The invention discloses a method for leading out a heat exchange tube from a fender post and a crown beam in construction of an energy subway station, which comprises the following steps: step 1, after a pile head of the fender post is broken, carrying out a first pressing test on the exposed heat exchange tube; 2, after the first pressing test is passed, the heat exchange tubes are cut off in the bottom direction of the top beam, the cut-off heat exchange tubes are connected through square bends, and the heat exchange tubes are made to be in the vertical state and converted into the horizontal state relative to the top beam; 3, the horizontal heat exchange tube is connected based on the right-angle bend, and after connection is completed, the heat exchange tube is subjected to a second-time pressing test; 4, after the second-time pressing test is passed, the heat exchange tube is protected; 5, top beam concrete is poured, and a top beam is formed; according to the scheme, the heat exchange pipe in the metro station fender post can be well, safely and efficiently led out, the structural characteristics of the metro station fender post and the connecting mode of the pile top and the top beam can be effectively compatible, and the construction progress of a station is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of energy pile construction, and in particular to a solution for leading a heat exchange pipe out of an energy support structure. Background Art

[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 station buildings. Heat exchange pipes are buried in the pile foundation to exchange heat 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 reserved at the top of the energy pile, serving as the primary interface for horizontal pipe connections. These connections are also crucial for connecting the energy pile to the heat pump unit and enabling heat transfer. However, energy piles are currently still in the experimental or small-scale demonstration phase and have not yet been widely used in actual projects, particularly subway projects. Given the practical characteristics of subway construction sites, the key issue is how to safely and efficiently route the heat exchange pipes from the station retaining piles.

[0004] Currently, energy piles are still primarily in the experimental research phase, with relatively limited actual engineering use, primarily in residential construction as pile foundations to support building loads. Furthermore, existing energy underground structures are limited in scope and are still in the initial stages of research and development, typically focusing on a single structure such as energy piles, energy floors, energy tunnels, and energy ground-connected walls. Currently, there is no experience connecting these various structures.

[0005] Subway retaining piles are a crucial component of the support system for underground excavated subway stations. They bear the soil loads on both sides of the station and are directly related to the safety of station construction. Existing solutions do not yet include using the retaining piles in subway stations as energy piles, nor do they include solutions for extracting energy pipes from the retaining piles.

[0006] For example, Chinese patent application CN115652908A discloses an energy support pile system and its construction method. This method connects multiple energy support piles and energy anchors in parallel within a water collection / distribution pipeline within the crown beam. Inlet / outlet pipelines are reserved for connections to heat pump units and air conditioning and heating systems, achieving modular packaging and ensuring the entire pipeline is protected from damage during construction and operation.

[0007] The heat exchange tubes were connected and brought together using sealing sleeves, waterproof tape, tees, manifolds, tees, and interface pipes. The connectors were buried in the soil at the bottom of the crown beam to prevent them from being encased in concrete. This solution was relatively complex to implement on-site, making it difficult to scale up on-site.

[0008] The above solution does not consider the practical problems of safely and efficiently leading the heat exchange pipes out of the subway retaining piles and crown beams before they are connected and connected. How to simply and efficiently lead the heat exchange pipes out of the subway retaining piles and crown beams during the construction of energy subway stations is an urgent problem in this field. Summary of the Invention

[0009] In view of the problem of how to effectively lead out heat exchange pipes from subway retaining piles and crown beams in the construction of existing energy subway stations, the purpose of the present invention is to provide a method for leading out heat exchange pipes from retaining piles and crown beams in the construction of energy subway stations. The method can safely and efficiently lead out the heat exchange pipes in the retaining piles of the subway station and can effectively be compatible with the structural characteristics of the retaining piles of the subway station and the method of connecting the pile top and the crown beam, without affecting the construction progress of the station itself.

[0010] In order to achieve the above-mentioned purpose, the technical means adopted by the present invention are specifically as follows:

[0011] A method for leading heat exchange pipes from retaining piles and crown beams in energy-oriented subway station construction, the method comprising the following steps:

[0012] Step 1: After the retaining piles are broken, the exposed heat exchange tubes are subjected to the first pressure test;

[0013] Step 2: After the first pressure test is passed, the heat exchange tube is cut along the bottom of the crown beam, and the cut heat exchange tube is connected with a right-angle elbow to convert the heat exchange tube from a vertical state relative to the crown beam to a horizontal state;

[0014] Step 3: Connect the horizontal heat exchange tubes based on the right-angle elbows, and perform a second pressure test on the heat exchange tubes after the connection is completed;

[0015] Step 4: After the second pressure test is passed, protect the heat exchange tubes;

[0016] Step 5: pouring crown beam concrete to form the crown beam;

[0017] Preferably, the pressure test is to connect one end of the heat exchange sleeve formed by welding to the pressure test equipment and the other end to the pressure gauge. At that time, pressurized gas of a certain pressure is injected into the heat exchange tube through the pressure test 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 sleeve in the pile body is in good connection condition.

[0018] Preferably, the single retaining pile has two extended heat exchange pipe inlet and outlet ports, which are connected by two right-angle elbows and two connecting pipes of reserved length. The right-angle elbow connects the vertical heat exchange pipe port and the horizontal connecting pipe, and one end of the horizontal connecting pipe is connected to the right-angle elbow.

[0019] Preferably, the length of the horizontal heat exchange pipe connected in step 3 matches the cross-sectional length of the crown beam, and the length of the horizontal heat exchange pipe can extend from the point where the retaining pile extends to the inner wall of the crown beam casting template. The connecting pipe here is a heat exchange pipe of a reserved length to be led out from the retaining pile and the crown beam.

[0020] Preferably, in step 4, rubber-plastic thermal insulation cotton and PVC sleeve are used to protect the heat exchange tube. The rubber-plastic thermal insulation cotton is placed in the PVC sleeve as a whole, and the PVC sleeve with built-in rubber-plastic thermal insulation cotton is sleeved on the heat exchange tube.

[0021] Preferably, in step 4, an extruded plate is provided at the end of the heat exchange tube close to the inner wall of the template to form a reserved subsequent docking space. The size of the extruded plate is preferably 10 cm. 3 The extruded board is placed here to protect the end joint of the connecting pipe from being poured with concrete. After the concrete is poured and solidified, the extruded board is removed and a 10cm gap is formed at the end of the connecting pipe. 3 Such operating space enables the continued connection of subsequent connecting pipes.

[0022] Preferably, the end of the connecting pipe close to the inner wall of the template needs to be subjected to a second pressure test before the sealing cap and tape are installed.

[0023] Preferably, the horizontal connecting pipe is tied and fixed to the bottom of the crown beam reinforcement cage to avoid vibration damage caused by subsequent construction.

[0024] Preferably, the energy support structure further includes a station roof, and the station roof is not provided with heat exchange pipes.

[0025] The present invention provides a solution for extending the heat exchange tubes from the energy support structure. Pressure tests are performed after each heat exchange tube connection or joint addition to ensure the proper connection of the heat exchange sleeves. Furthermore, the use of rubber-plastic insulation and PVC sleeves prevents damage to the heat exchange tubes during concrete pouring.

[0026] Secondly, by using extruded plates of the required operating space size to fill the position where the heat exchange tubes are led out from the crown beam, continuous connection of the heat exchange tubes can be achieved in the later stage. On the one hand, such space forms a certain protection area for the heat exchange tube interface, so that the heat exchange tubes can be effectively protected and will not be affected by large-scale equipment on site and the construction environment; on the other hand, it facilitates the template construction before concrete pouring, avoids opening holes in the template, and thus improves construction efficiency.

[0027] In addition, the connecting pipe construction of the heat exchange tubes and the reinforcement construction of the crown beam are carried out synchronously. After the main reinforcement of the bottom layer of the crown beam is constructed, the lead-out connection of the heat exchange tubes does not affect the construction of the crown beam reinforcement cage, thereby not affecting the construction progress and improving the construction efficiency of the energy support structure.

[0028] Furthermore, the solution provided by the present invention has a simple implementation process, is easy to operate, and can be promoted on a large scale in actual application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0030] Figure 1 This is a flow chart of the safe extraction of heat exchange pipes from subway retaining piles and crown beams in the present invention;

[0031] Figure 2 This is an example diagram of the relative positions of the retaining pile tops, crown beams, heat exchange tubes, and station roof in the subway station of the present invention;

[0032] Figure 3 This is an example diagram of the state where the heat exchange pipes are led out from the retaining piles and the crown beam in an example of the present invention. DETAILED DESCRIPTION

[0033] 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.

[0034] During subway station construction, an energy support structure with bearing capacity and heat exchange capabilities serves as the main framework. The energy support structure includes a crown beam and retaining piles. The crown beam is arranged above the heads of the retaining piles and is arranged along the entire length of the retaining piles. The crown beam and the retaining piles are fixedly connected to form the energy support structure. The heat exchange pipes are arranged in the retaining piles. Safely leading them out from the top of the retaining piles through the crown beam is a difficult point in the actual construction process.

[0035] In this regard, in order to determine how to safely lead out heat exchange pipes from subway retaining piles and crown beams during subway station construction, the present invention provides a method for leading out heat exchange pipes from retaining piles and crown beams during energy-oriented subway station construction. This method achieves the deflection and extension of the heat exchange pipes extending from the retaining piles by adding corresponding right-angle elbows, and makes them match the construction of the on-site crown beams. The heat exchange pipes are subjected to multiple pressure tests to ensure safety and reliability, thereby effectively solving the problem of connection and safe leading out of heat exchange pipes between different energy structures. By standardizing the on-site heat exchange pipe connection and protection process, not only the potential damage of the heat exchange pipes is avoided, but also the construction efficiency of the energy support structure is not affected.

[0036] Aiming at the energy subway station construction scenario, the present invention provides a method for leading the heat exchange pipe from the retaining pile and the crown beam, which can effectively be compatible with the structural characteristics of the subway station retaining pile and the connection method between the pile top and the crown beam, without affecting the construction progress of the station itself. Figure 1 As shown, the corresponding implementation process includes the following steps:

[0037] Step 1: First, clarify the relative positions of the retaining pile tops, crown beams, heat exchange tubes and station roof in the subway station.

[0038] Combine Figure 2 As shown, it shows the energy support structure involved in the solution of the present invention, which includes a crown beam 11, a retaining pile 12, and a station roof 13, wherein the crown beam is arranged on the top of the retaining pile and is arranged along the arrangement direction of multiple retaining piles; the pile top crown beam connects all the retaining piles through an internal steel cage to form an energy support structure with a common load on the overall frame.

[0039] Furthermore, the crown beam is a rectangular parallelepiped parallel to the ground and perpendicularly connected to the arrayed retaining piles. Its length matches the overall length of the arrayed retaining piles, and its cross-section is rectangular. The length of the cross-section matches the diameter of the retaining piles it connects to. The height of the cross-section is related to the design parameters of the foundation pit depth and the length of the steel bars extending from the top of the retaining piles. The crown beam is fixedly connected to the steel bars extending from the top of the retaining piles after the pile heads are removed via a steel cage. Casting is then performed to securely connect the crown beam to the retaining piles, forming a cohesive framework-like energy support structure.

[0040] Furthermore, the heat exchange tubes 14 in the retaining piles 12 are positioned slightly lower than the reinforcement bars at the top of the piles.

[0041] Step 2: After the construction of the retaining pile as the energy pile is completed, after the pile head is broken, the exposed heat exchange tube is subjected to the first pressure test.

[0042] As an example, when constructing retaining piles, the heat exchange tubes are first arranged in a predetermined manner in the retaining piles. Steel casing is pre-covered on the outside of the water inlet and outlet of the heat exchange tubes at the pile head, and then the retaining piles are poured with concrete. When the poured retaining piles reach the conditions for breaking the pile heads after curing, a manual jackhammer is used to remove the steel bars and break the bottom cross-section of the pile head. After finding the heat exchange tubes inside the steel bars, a steel pipe cutting device that can protect the heat exchange tubes from being damaged is used to pre-cut the steel casing outside the heat exchange tubes, and then a crane is used to remove the pile heads.

[0043] In this step, after the retaining pile is constructed and the pile head is removed, the heat exchange tube protected by the steel casing of the pile head is taken out, and the air tightness of the heat exchange tube is checked and tested using a pressurized method to confirm that the heat exchange tube in the retaining pile is not damaged, thereby ensuring the normal use of the retaining pile as an energy pile in the future.

[0044] As a further explanation, when performing the pressure test in this step, one end of the heat exchange sleeve formed by welding is connected to the pressure test equipment, and the other end is connected to the pressure gauge. At this time, pressurized gas of a certain pressure is injected into the heat exchange tube through the pressure test 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 sleeve in the pile body is in good connection condition.

[0045] Step 3: After the first pressure test is passed, the heat exchange tube is cut off and diverted.

[0046] See also Figure 3 In this step, for the heat exchange tubes that have completed the first pressure test, while the crown beam 11 steel cage is being constructed, the heat exchange tubes 14-1 that are vertically distributed relative to the crown beam are cut off along the bottom of the crown beam 11, and the cut heat exchange tubes 14 are connected using right-angle elbows 15. The free ends of the right-angle elbows 15 are extended into the crown beam steel cage and are in a horizontal state, thereby converting the heat exchange tubes from their original vertical state relative to the crown beam to a horizontal state.

[0047] Specifically, here, for the heat exchange tubes vertically led out from the retaining piles, a 90-degree electric fusion elbow is used for welding, so that when it is extended into the crown beam, the heat exchange tubes are turned horizontally at the same time, and then the heat exchange tubes extending in the water direction are welded to realize the horizontal leading out of the crown beam.

[0048] Step 4: Match and connect the horizontal heat exchange tubes and perform a second pressure test.

[0049] In this step, the heat exchange tube that has completed the reversing setting by connecting the right-angle elbow 15 is further matched with the heat exchange tube 14-2 in the horizontal direction, that is, the right-angle elbow 15 is connected to the horizontal heat exchange tube, and the heat exchange tube is extended so that the heat exchange tube extends out from the dense crown beam steel bars in the horizontal direction. After completing the horizontal extension connection of the heat exchange tube, the entire heat exchange tube is subjected to a second pressure test.

[0050] This step aims at matching the length of the horizontal section heat exchange tube, which needs to be extended to the inner wall of the template, that is, the outside of the concrete.

[0051] The implementation plan for the second pressure test on the heat exchange tubes is as mentioned above and will not be repeated here.

[0052] Step 5: After the second pressure test is passed, protect and maintain the heat exchange tubes.

[0053] In this step, the heat exchange tube is pressurized for the second time. After the pressure test, the horizontally extended heat exchange tube is protected, and the end of the heat exchange tube is sealed and an extruded plate is placed to form a reserved subsequent docking space.

[0054] In this step, the heat exchange tubes 14-2 horizontally distributed in the crown beam are protected by rubber-plastic thermal insulation cotton 16 and PVC sleeves 17 for the horizontally extended heat exchange tubes. The rubber-plastic thermal insulation cotton 16 is placed as a whole in the PVC sleeve 17, and a through hole is formed to allow the heat exchange tube to pass through. Based on this, the PVC sleeve 17 with built-in rubber-plastic thermal insulation cotton 16 is sleeved on the heat exchange tube. The rubber-plastic thermal insulation cotton 16 located inside the PVC sleeve is directly coated on the heat exchange tube to form thermal insulation and buffer protection. The PVC sleeve 17 located on the outside forms protection for the rubber-plastic thermal insulation cotton and the heat exchange tube inside based on its own strength.

[0055] When setting the extruded plate 18 at the end of the heat exchange tube in this step, it is preferred to place the corresponding extruded plate at the end of the heat exchange tube close to the inner wall of the template to form a reserved subsequent docking space, thereby ensuring the stability and reliability of subsequent construction and avoiding impact on the heat exchange tube.

[0056] Step 6: Pour the crown beam concrete to achieve a fixed connection between the crown beam and the retaining piles.

[0057] After confirming that all heat exchange sleeves in the crown beam are in good connection and sealed and the extruded board is placed, the crown beam is poured with concrete in the template to achieve a fixed connection between the crown beam and the retaining piles, forming an energy support structure with common load on the overall frame.

[0058] The following specifically describes the specific implementation process of the method for leading the heat exchange tubes from the retaining piles and crown beams formed above in conjunction with the construction of energy subway stations.

[0059] This method for extracting heat exchange tubes from retaining piles and crown beams, based on the above-described method, is used during the construction of energy subway stations. After the first pressure test on the exposed heat exchange tubes after the pile heads are broken, that is, after the pressure test of the heat exchange tubes in the retaining piles is completed and passed, the crown beam is then laid out along the entire length of the retaining piles, and the heat exchange tubes are simultaneously arranged within the crown beam. The safe extraction of the heat exchange tubes here takes place between the construction of the crown beam reinforcement cage and the pouring of the crown beam.

[0060] Specifically, a single retaining pile has two extended heat exchange pipe inlet and outlet ports, which are connected by two right-angle elbows and two connecting pipes of reserved length. Figure 3 As shown, first, the heat exchange tube 14-1 extending vertically from the retaining pile along the bottom of the crown beam is cut off, and the cut heat exchange tube is connected using a right-angle elbow 15, and the free end of the right-angle elbow 15 is extended into the crown beam reinforcement cage and is in a horizontal state. Then, the heat exchange tube 14-2 extending horizontally is connected by the free end of the right-angle elbow extending into the crown beam reinforcement cage and in a horizontal state. The horizontally extended heat exchange tube is extended and extended horizontally in the relatively dense crown beam reinforcement as a whole until the length of the heat exchange tube reaches the inner wall of the template, that is, the outside of the concrete.

[0061] On this basis, a second pressure test is carried out on the heat exchange tubes that have completed horizontal turning and horizontal extension. After the test is completed, the protruding ends of the horizontally extended heat exchange tubes are sealed with PVC sleeves 17 with built-in rubber and plastic insulation cotton 16 and tape, that is, the PVC sleeves with built-in rubber and plastic insulation cotton are integrally sleeved on the connecting end, and the end 14-3 of the heat exchange tube is sealed by a pipe cap, and sealed with multiple layers of tape, thereby preventing the entry and damage of concrete during the pouring of the crown beam, and facilitating the subsequent demolding and connecting of the pipes.

[0062] Here, the direction of the heat exchange tube is changed by a right-angle elbow. The reserved length of the connecting pipe matches the length of the crown beam cross section. The reserved length of the connecting pipe is used to extend from the retaining pile to the inner wall of the crown beam casting template.

[0063] Here, the heat exchange pipes used for horizontal extension are coordinated with the right-angle elbows to achieve the lead-out from the retaining piles and crown beams.

[0064] Next, for the heat exchange tubes that have been protected, an extruded plate is placed at the end of the connecting pipe close to the inner wall of the crown beam casting template to form a reserved subsequent docking space. The size of the extruded plate here is preferably 10cm 3 .

[0065] The extruded plate is used to protect the end joint of the connecting pipe from being poured with concrete. After the concrete is poured and solidified, the extruded plate is removed and the end of the connecting pipe is formed into a 10cm 3 The operation space here avoids the need to open holes in the template, improving construction efficiency; on the other hand, it allows the ends of the connecting pipes to be pre-protected in the crown beam space to avoid being affected by large equipment and pouring construction.

[0066] It should be noted here that before installing the sealing pipe cap and tape, the end of the connecting pipe close to the inner wall of the template needs to be pressure tested for the second time to ensure that the water tightness performance of the connection of the heat exchange sleeve in this operation step is in good condition and to ensure the connection status of the heat exchange sleeve in the crown beam.

[0067] The horizontal connecting pipe is tied and fixed to the bottom of the crown beam reinforcement cage to prevent vibration damage caused by subsequent construction.

[0068] The energy support structure formed based on the present invention can also include a station roof, which does not have heat exchange tubes. This energy support structure, which combines a heat exchange system with a load-bearing support structure to provide both heat exchange and load-bearing capacity, achieves dual-purposes in station and subway construction, promoting the further promotion and application of energy pile technology.

[0069] The method for leading heat exchange pipes from retaining piles and crown beams in energy-oriented subway station construction provided by the present invention has the following technical effects compared with the existing technology:

[0070] 1. Can effectively protect the heat exchange tubes buried in the energy structure

[0071] During on-site construction, due to the interconnection between different energy structures, pressure tests were performed after each docking or joint addition to ensure the heat exchange piping was in good condition. Furthermore, the heat exchange piping in each energy structure was protected with rubber-plastic insulation and PVC casing to prevent damage during concrete pouring.

[0072] 2. A docking slot is reserved for easy connection of pipes in the later stage.

[0073] At the location where the heat exchange tube comes out from the crown beam, a 10cm 3 Extruded panels are used as filler, and after the concrete solidifies, the panels can be removed, creating a clear operating space. This space allows for the continued connection of heat exchange tubes. This space facilitates formwork construction before concrete pouring, avoiding the need for openings in the formwork. It also creates a protective zone for the heat exchange tube connections, effectively protecting them from the effects of large on-site equipment and the construction environment.

[0074] 3. Does not affect the construction progress.

[0075] On the one hand, the horizontal connecting pipes of the heat exchange tubes cooperate with the steel bar construction of the crown beam. After the main reinforcement of the bottom layer of the crown beam is constructed, the heat exchange tube connection follows. On the other hand, since the joints leading out of the heat exchange tubes are pre-protected in the crown beam space with extruded plates, the need to open holes in the template is avoided, which does not affect the construction progress.

[0076] 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 method for leading heat exchange pipes from retaining piles and crown beams in energy-oriented subway station construction, characterized in that: The method comprises the following steps: Step 1: After the retaining piles are broken, the exposed heat exchange tubes are subjected to the first pressure test; Step 2: After the first pressure test is passed, the heat exchange tube is cut along the bottom of the crown beam, and the cut heat exchange tube is connected with a right-angle elbow to convert the heat exchange tube from a vertical state relative to the crown beam to a horizontal state; Step 3: Connect the horizontal heat exchange tubes based on the right-angle elbows, and perform a second pressure test on the heat exchange tubes after the connection is completed; Step 4: After the second pressure test is passed, protect the heat exchange tubes; Step 5: Pour the crown beam concrete to form the crown beam.

2. According to the method for leading heat exchange pipes from retaining piles and crown beams in energy-oriented subway station construction according to claim 1, the length of the horizontal heat exchange pipe connected in step 3 extends to the inner wall of the crown beam casting template.

3. According to the method for leading heat exchange pipes from retaining piles and crown beams in energy-oriented subway station construction according to claim 1, in step 4, rubber-plastic insulation cotton and PVC sleeves are used to protect the heat exchange pipes, the rubber-plastic insulation cotton is placed as a whole in the PVC sleeve, and the PVC sleeve with built-in rubber-plastic insulation cotton is sleeved on the heat exchange pipe.

4. According to the method for leading heat exchange pipes from retaining piles and crown beams in energy-oriented subway station construction according to claim 1, in step 4, an extruded plate is provided at the end of the heat exchange pipe close to the inner wall of the template to form a reserved subsequent docking space.

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