Phase change expansion and contraction drawing pore forming tube and pore forming method

Abstract

The application discloses a phase change expansion and contraction drawing pore pipe and a pore forming method. The pore pipe comprises a gas expansion outer pipe body, a phase change material filled in the gas expansion outer pipe body and a heat transfer cable penetrating through the phase change material. When pores are formed, various pore forming specifications required in engineering are formed by using the gas expansion outer pipe body and the phase change material. After pore forming is completed, the gas expansion outer pipe body and the phase change material can be recycled and reused. The repeated use of the gas expansion outer pipe body and the phase change material greatly reduces material waste caused by pore forming, improves the repeated use rate of pore forming materials, reduces engineering cost and saves engineering construction cost.

Description

Technical Field

[0001] This invention belongs to the field of engineering hole-making technology, specifically relating to a phase change expansion and contraction extraction hole-making tube and a hole-making method. Background Technology

[0002] With the continuous advancement of national economic development and urbanization, more and more projects are under construction at an accelerated pace. During construction, many projects require pre-embedding sleeves or formwork before concrete pouring to create necessary openings for later installation of pipelines or prestressed steel bars. Typical examples include drilling holes for prestressed steel bars in post-cast prestressed bridges, sonic logging pipes for bridge pile foundations, power and communication conduits in various engineering structures, and drainage pipelines in tunnels and underground engineering projects. Prestressing is a common measure in long-span bridges and is frequently used in bridge engineering. Post-tensioning, in particular, involves directly tensioning the tendons on the structural members without the need for a dedicated platform. This avoids long-distance transportation of components during on-site production, making it suitable for large components produced on-site, especially long-span components such as thin-webbed beams, crane beams, and roof trusses. To facilitate later tensioning, prestressing holes need to be reserved in concrete beams for prestressing tendons. Currently, these holes are mostly formed by pre-embedding metal corrugated pipes or plastic corrugated pipes. In principle, the corrugated pipes are no longer needed after the holes are formed. However, during the concrete pouring process, the corrugated pipes and concrete are already poured together and cannot be pulled out for reuse. Furthermore, each prestressing steel bar requires a corrugated pipe, resulting in a large amount of material waste.

[0003] Therefore, while ensuring that the quality of the borehole meets the requirements, how to improve the reusability of the borehole material and reduce the unit price of the borehole is an urgent problem to be solved in engineering construction. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide a phase change expansion and contraction extraction hole-making tube and a hole-making method, so as to improve the reusability of hole-making materials and reduce the unit price of hole-making.

[0005] The present invention solves the above problems through the following technical means:

[0006] A phase change expansion and contraction extraction hole-making tube includes an air-expanded outer tube body, a phase change material filled in the air-expanded outer tube body, and a heat transfer cable passing through the phase change material.

[0007] Furthermore, the heat transfer cable passes through the center of the phase change material.

[0008] Furthermore, the inflatable outer tube is made of rubber.

[0009] Furthermore, the phase change material is a solid-liquid phase change material.

[0010] A method for creating a perforated tube based on phase change expansion and contraction includes the following steps:

[0011] S1: The pneumatic outer tube is inflated and pressurized to expand, and liquid phase change material is injected. After cooling, the phase change material changes from liquid to solid and fills the pneumatic outer tube, making the pneumatic outer tube form a stable perforated tube structure.

[0012] S2: Place the perforation tube structure at the location where a hole needs to be made, and pour concrete;

[0013] S3: After the concrete reaches its design strength, the heat transfer cable begins to heat up, and the phase change material melts and flows out from a solid state to a liquid state.

[0014] S4: After the phase change material is completely discharged, the air-expanded outer tube vents and contracts. The contracted air-expanded outer tube is then extracted from the concrete to form a hole.

[0015] Furthermore, in step S1, before filling with phase change material, a heat transfer cable is first inserted into the center of the pneumatic outer tube.

[0016] The beneficial effects of this invention are:

[0017] This application discloses a phase change expansion and contraction extraction perforation tube and a perforation method. The perforation tube includes an inflatable outer tube body, a phase change material filled within the inflatable outer tube body, and a heat transfer cable passing through the phase change material. During perforation, the inflatable outer tube body and the phase change material are used to form various perforation specifications required in the project. After perforation, the inflatable outer tube body and the phase change material can be recycled and reused. This reuse of the inflatable outer tube body and the phase change material greatly reduces material waste caused by perforation, increases the reusability rate of perforation materials, reduces project costs, and saves on project construction costs. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the longitudinal section of the phase change expansion and contraction extraction hole-making tube of the present invention;

[0020] Figure 2 This is a schematic diagram of the transverse cross-section of the phase change expansion and contraction extraction hole-making tube of the present invention;

[0021] Figure 3 This is a schematic diagram of the hole-making process. Detailed Implementation

[0022] The present invention will be further described in detail below through embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0023] like Figures 1 to 3 As shown, this embodiment provides a phase change expansion and contraction extraction hole-making tube, including an air-expanded outer tube body 1, a phase change material 2 filled in the air-expanded outer tube body, and a heat transfer cable 3 passing through the phase change material; the heat transfer cable passes through the center of the phase change material, the air-expanded outer tube body is made of rubber, and the phase change material is a solid-liquid phase change material.

[0024] The inflatable outer tube expands under high pressure and quickly retracts after deflation. It is extremely convenient and quick to use, and can be reused multiple times. The diameter of the inflatable outer tube can be customized; a batch of the appropriate specifications can be purchased according to project requirements, and subsequent purchases can be reused.

[0025] Phase change materials (PCMs) possess the ability to change their physical state within a certain temperature range. The PCM used in this invention undergoes a solid-liquid phase change. When heated to its melting temperature, it undergoes a phase change from solid to liquid, and the PCM is discharged upon melting. Upon cooling, it undergoes a reverse phase change from liquid to solid. When pore formation is required, the heated liquid PCM is injected into an inflatable outer tube, and after cooling, the desired pore size is formed. Once the pore is formed, the PCM is heated via a heat transfer cable. After absorbing heat, the PCM changes from solid to liquid and is discharged. The liquid PCM is collected for reuse.

[0026] The heat transfer cable is placed in the middle of the phase change material. Its main function is to heat the solid phase change material to form a liquid state after the hole is formed, so that the phase change material can be discharged.

[0027] This embodiment also provides a hole-making method for a hole-making tube based on phase change expansion and contraction, including the following steps:

[0028] S1: The pneumatic outer tube is inflated and pressurized to expand, and liquid phase change material is injected. After cooling, the phase change material changes from liquid to solid and fills the pneumatic outer tube, making the pneumatic outer tube form a stable perforated tube structure. Before filling the phase change material, a heat transfer cable is inserted into the center of the pneumatic outer tube.

[0029] S2: Place the perforation tube structure at the location where a hole needs to be made, and pour concrete;

[0030] S3: After the concrete reaches its design strength, the heat transfer cable begins to heat up, and the phase change material melts and flows out from a solid state to a liquid state.

[0031] S4: After the phase change material is completely discharged, the air-expanded outer tube vents and contracts. The contracted air-expanded outer tube is then extracted from the concrete to form a hole.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for creating a perforated tube based on phase change expansion and contraction, characterized in that: The phase change expansion and contraction pump The perforation tube includes an inflatable outer tube, a phase change material filled inside the inflatable outer tube, and a heat transfer cable passing through the phase change material; it includes the following steps: S1: The pneumatic outer tube is inflated and pressurized to expand, and liquid phase change material is injected. After cooling, the phase change material changes from liquid to solid and fills the pneumatic outer tube, making the pneumatic outer tube form a stable perforated tube structure. S2: Place the perforation tube structure at the location where a hole needs to be made, and pour concrete; S3: After the concrete reaches its design strength, the heat transfer cable begins to heat up, and the phase change material melts and flows out from a solid state to a liquid state. S4: After the phase change material is completely discharged, the air-expanded outer tube body is vented and shrinks. The shrunken air-expanded outer tube body is extracted from the concrete to form a hole. In step S1, before filling with phase change material, a heat transfer cable is inserted into the center of the pneumatic outer tube.

2. The hole-making method for a hole-making tube based on phase change expansion and contraction extraction according to claim 1, characterized in that: The heat transfer cable passes through the center of the phase change material.

3. The hole-making method for a hole-making tube based on phase change expansion and contraction extraction according to claim 2, characterized in that: The inflatable outer tube is made of rubber.

4. The hole-making method for a hole-making tube based on phase change expansion and contraction extraction according to claim 3, characterized in that: The phase change material is a solid-liquid phase change material.

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