A support structure for underground pipelines in a foundation pit and its construction method

Abstract

This invention provides a support structure for underground pipelines within a foundation pit. The structure includes: a slope protection structure, a support and protection structure, and an elevated layer structure. The slope protection structure covers the slope surface within the foundation pit. A plurality of the support and protection structures are sequentially arranged within the foundation pit to support the underground pipeline. The elevated layer structure includes steel pipe piles, a cap beam, scissor bracing, vertical fireproof insulation boards, horizontal fireproof insulation boards, an isolation layer, a protective layer, a structural layer, a soil layer, and a foundation. The lower ends of the steel pipe piles are embedded in the ground at the toe of the slope. Through the vertical support of the steel pipe piles and the horizontal elevated layer structure, the underground pipeline protected by the lower support and protection structure is isolated from the outside environment, preventing disturbance and vibration from external objects and forces. Furthermore, it fully utilizes the horizontal space created by the elevated structure after slope excavation.

Description

Technical Field

[0001] This invention relates to the field of retaining structure design technology in geotechnical engineering, and particularly to an underground pipeline support structure in a foundation pit and its construction method. Background Technology

[0002] The complex surrounding environment of the foundation pit is one of the important factors restricting the foundation pit support scheme. This complexity includes the presence of a complex network of underground pipelines around the pit. To avoid disturbing the existing underground pipelines, the traditional foundation pit support approach adopts the principle of avoidance, and the corresponding foundation pit support scheme is vertical support, generally using cast-in-place concrete piles. Strict deformation requirements necessitate the use of anchor cables or internal bracing. This scheme has two drawbacks: firstly, it involves a large amount of support work, high investment costs, and a long construction period; secondly, the concrete pouring or demolition can easily cause environmental pollution, making it neither low-carbon nor environmentally friendly.

[0003] The surrounding environment of the excavation pit has ample space, making slope protection (wire mesh and shotcrete) a viable option. This solution is simple and economical, but the pit's depth leads to significant space waste and a large volume of earthwork. Furthermore, the excavation process will expose some underground pipelines, requiring pre-existing reinforcement and support. The reinforcement and support measures will be determined based on the pipeline's material, purpose, and deformation control requirements. Additionally, the exposed underground pipelines are susceptible to bursting and freezing during the long winter months. Traditional methods involve wrapping the pipelines with insulation material, but this material is prone to aging and is flammable, posing a fire hazard. Summary of the Invention

[0004] The main objective of this invention is to provide a support structure and construction method for underground pipelines within a foundation pit, aiming to solve any of the technical problems associated with traditional support structures for underground pipelines in the surrounding environment, such as high investment costs, long construction periods, and potential environmental pollution. This invention utilizes vertical steel pipe pile support and a horizontal elevated structure to isolate the underground pipelines protected by the lower support structure from the outside world, preventing disturbance and vibration from external objects and forces. Simultaneously, it fully utilizes the horizontal space created by the elevated structure after slope excavation. By installing a photovoltaic panel array on the upper part of the elevated structure, solar energy is used to generate heat, or electricity is supplied via mains power to connect to heating pipes, providing heat to the enclosed space below, which is enclosed by vertical and horizontal fireproof insulation boards, preventing the underground pipelines from freezing. This invention utilizes clean and efficient solar energy, is green and pollution-free, achieves self-generation and self-consumption, and eliminates the burden of electricity consumption during peak periods.

[0005] This invention provides a support structure for underground pipelines within a foundation pit, comprising:

[0006] A slope protection structure is provided on the slope surface of the foundation pit. The slope protection structure is intermittently provided with a number of rectangular grooves along the longitudinal direction, and heating pipes are installed in the number of rectangular grooves.

[0007] A supporting and protective structure is provided, wherein a plurality of such supporting and protective structures are sequentially arranged within the foundation pit; the plurality of supporting and protective structures are used to support underground pipelines; the supporting and protective structure includes a front column pile, a rear column pile, a lower support, a jack, an upper support, and an anti-seismic component; the front column pile is located on one side of the slope crest; the rear column pile is located on one side of the slope toe; the lower ends of the front column pile and the rear column pile are embedded in the stratum below the slope protection structure, and the upper ends of the front column pile and the rear column pile are symmetrically distributed and connected to the bottom end of the lower support; the jack is located between the upper support and the lower support; the lower end of the jack is fixed at the top center of the lower support, and the upper end of the jack is in rigid contact with the bottom end of the upper support; the top of the upper support supports the anti-seismic component.

[0008] The elevated structure includes steel pipe piles, a capping beam, scissor bracing, vertical fireproof insulation boards, horizontal fireproof insulation boards, an isolation layer, a protective layer, a structural layer, a soil layer, and a foundation. The lower ends of the steel pipe piles are embedded in the soil at the toe of the slope. The upper ends of the steel pipe piles are anchored to the capping beam. The scissor bracing is fixedly connected to the steel pipe piles. The vertical fireproof insulation boards are located inside the steel pipe piles and are arranged vertically along the toe of the slope. The foundation is located inside the top of the slope. The horizontal fireproof insulation boards, isolation layer, protective layer, structural layer, and soil layer are distributed from bottom to top, and the right ends of the horizontal fireproof insulation boards, isolation layer, protective layer, and structural layer are all anchored in the capping beam. The left ends of the horizontal fireproof insulation boards, isolation layer, protective layer, and structural layer are all anchored in the foundation.

[0009] Preferably, it further includes: a power generation and heating system, the power generation and heating system comprising a photovoltaic panel array, a steel support frame, a control box, and a constant temperature heating control device; the bottom end of the steel support frame is fixedly connected to the structural layer; the top end of the steel support frame supports the photovoltaic panel array, the photovoltaic panel array converts light energy into electrical energy and stores it in an energy storage device through an inverter; the energy storage device, the control box, and the constant temperature heating control device are electrically connected; the heating pipe is connected to the constant temperature heating control device.

[0010] Preferably, the horizontal position of the front and rear pillars of each of the supporting and protective structures is located between two adjacent rectangular grooves; the depth of the rectangular grooves is the same as the diameter of the heating pipe.

[0011] Preferably, the front and rear support columns are hollow steel pipes, symmetrically distributed on both sides of the underground pipeline. The lower and upper supports are rectangular steel structural members, with an arc-shaped groove at the center of the top of the upper support to restrict lateral displacement of the upper shock-absorbing component. Preferably, the shock-absorbing component includes an outer steel plate, an inner steel shell plate, and fasteners; the inner steel shell plate is made of soft plastic steel, in a bi-directional arc shape, with the inner side of the arc rigidly contacting the protected underground pipeline, and the outer side of the arc fixed to the outer steel plate by the fasteners.

[0012] Preferably, the steel pipe piles are arranged intermittently along the toe of the slope, the foundation is L-shaped, and a pre-embedded part is installed on the upper part of the flat end of the foundation. Circular holes are opened on the left side of the horizontal fireproof insulation board, isolation layer, protective layer and structural layer. The pre-embedded part passes through the circular hole and is fixed by the sealing anchor head. A micro anchor pile is set in the center of the bottom end of the foundation, and an anchor rod is set on the lower back side of the foundation.

[0013] Preferably, the structural layer is a steel plate, and an embedded part is installed in the center of the structural layer, with the bottom end of the steel bracket fixedly installed with the embedded part.

[0014] Preferably, the slope protection structure is a 100mm thick reinforced concrete structure, and the slope protection structure has internal structural bars with a diameter of 8mm parallel to the slope surface in both the horizontal and vertical directions, and reinforcing bars with a diameter of 160mm at 45° and 135° angles; a heat insulation component is installed between the slope protection structure and the heating pipe.

[0015] Preferably, the front column pile, rear column pile, steel pipe pile, upper support, lower support, structural layer and steel bracket are all coated with anti-corrosion paint.

[0016] Secondly, the present invention also provides a construction method for an underground pipeline support structure within a foundation pit, comprising the following steps:

[0017] S1. Detect the material, cross-sectional dimensions, purpose, planar location, and burial depth of underground pipelines;

[0018] The underground pipeline is simplified as a simply supported beam, and the support spacing is determined according to the load and deformation requirements.

[0019] S2. Based on the determined support spacing, intermittently excavate trenches perpendicular to the underground pipeline.

[0020] S3. Lay out and position the front and rear column piles, mechanically drill holes, install the front and rear column piles, grout, and check the pile position. After the curing period is completed, conduct pull-out tests and inspections.

[0021] S4. Install the lower support and fix it to the front and rear column piles by welding. After installation, install the jack at the center of the top of the lower support. After installation, install the upper support.

[0022] S5. Install the anti-vibration components. After installation, adjust the jacks to make the upper support and the anti-vibration components rigidly connected.

[0023] S6. The slope is excavated in layers and sections by combining machinery and manual labor, shotcrete is sprayed, steel mesh is tied, and shotcrete is sprayed again. After the curing period is reached, the slope is inspected. Rectangular grooves are left intermittently during the process. After the inspection is completed, the heating pipes are installed in the rectangular grooves.

[0024] S7. Lay out the position of steel pipe piles at the slope toe, place the piles at the bottom of the foundation pit, mechanically drill holes, install steel pipe piles, correct the pile position during the process, check the pile position after installation, install vertical fireproof insulation boards and fix them with nails; at the same time, excavate the foundation trench at the slope top, pour the foundation with embedded parts, and set micro anchor piles and anchor bolts during the process.

[0025] S8. Install horizontal fireproof insulation board, isolation layer, protective layer and structural layer from bottom to top. At the same time, tie the cap beam reinforcement on the right side and pour the cap beam concrete. Seal the anchor on the left side with the anchor head.

[0026] S9. Install steel brackets, photovoltaic panel array, inverter, control box, and constant temperature heating control device; connect the constant temperature heating control device and heating pipe; fill with water and test; generate electricity and provide heating.

[0027] Because the present invention adopts the above-described technical solution, the present invention has the following advantages:

[0028] 1. By reinforcing and supporting underground pipelines with upper and lower supports, and using slope protection structures to support the foundation pit slopes, the problems of high investment costs, long construction periods, and easy environmental pollution caused by traditional support structures are avoided. At the same time, the upper and lower supports are steel structure components, which fully utilizes the characteristics of steel structure materials such as lightweight, high strength, green environmental protection, recyclability, and low cost. In addition, steel structures have good seismic performance, which can reduce the disturbance of construction vibrations to underground pipelines.

[0029] 2. By supporting the underground pipeline with vertical steel pipe piles and erecting a horizontal overhead structure, the underground pipeline protected by the supporting structure below is isolated from the outside world to prevent disturbance and vibration from external objects and forces. On the other hand, the horizontal space formed by the overhead structure after the slope is excavated is fully utilized.

[0030] 3. By installing a photovoltaic panel array on the upper part of the elevated structure, heat is generated by solar power or supplied by the mains electricity and connected to the heating pipes to provide heat to the enclosed space below, which is enclosed by vertical and horizontal fireproof insulation boards, preventing underground pipes from freezing; it utilizes clean and efficient solar energy, is green and pollution-free, achieves self-generation and self-consumption, and has no electricity burden during peak hours. Attached Figure Description

[0031] Figure 1 This is a cross-sectional schematic diagram of the underground pipeline support structure within the foundation pit of the present invention.

[0032] Figure 2 This is a magnified schematic diagram of part A of the present invention.

[0033] Figure 3 This is a top view schematic diagram of the underground pipeline support structure within the foundation pit of the present invention.

[0034] Figure 4 This is a magnified schematic diagram of part B of the present invention.

[0035] Figure 5 This is a cross-sectional view of the overhead layer structure in the underground pipeline support structure within the foundation pit of this invention.

[0036] Figure 6 This is a schematic diagram of the anti-seismic components in the underground pipeline support structure within the foundation pit of the present invention.

[0037] Figure 7 This is a schematic diagram of the foundation, micro-anchor piles, and anchor bolts of the underground pipeline support structure in the foundation pit of this invention.

[0038] Figure 8 This is a detailed plan view of the slope protection structure in the underground pipeline support structure within the foundation pit of this invention.

[0039] Reference numerals: 1-Slope protection structure; 11-Rectangular groove; 2-Support protection structure; 21-Front column pile; 22-Rear column pile; 23-Lower support; 24-Jack; 25-Upper support; 26-Seismic isolation component; 261-Outer steel plate; 262-Inner steel shell plate; 263-Fixing component; 3-Elevated layer structure; 31-Steel pipe pile; 32-Cap beam; 33-Scissor brace; 34-Vertical fireproof insulation board; 35-Horizontal 36-Fireproof insulation board; 37-Isolation layer; 38-Protective layer; 39-Structural layer; 310-Subsoil layer; 311-Foundation; 312-Miniature anchor pile; 313-Anchor bolt; 314-Embedded part; 315-Anchor head sealing; 4-Power generation and heating system; 41-Photovoltaic panel array; 42-Steel bracket; 43-Inverter; 44-Control box; 45-Constant temperature heating control device; 46-Heating pipe; 5-Underground pipeline; 6-Slope. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are merely some, not all, of the embodiments of this invention. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0041] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0042] Example 1, as Figure 1-8 As shown,

[0043] A support structure for underground pipelines within a foundation pit includes:

[0044] The slope protection structure 1 covers the slope surface of the slope 6 inside the foundation pit. The slope protection structure 1 is intermittently provided with a number of rectangular grooves 11 along the longitudinal direction. A heating pipe 46 is installed in the number of rectangular grooves 11.

[0045] Support and protection structure 2: Several support and protection structures 2 are sequentially installed in the foundation pit; the several support and protection structures 2 are used to support the underground pipeline 5.

[0046] The supporting protective structure 2 includes a front column pile 21, a rear column pile 22, a lower support 23, a jack 24, an upper support 25, and a seismic isolation component 26. The front column pile 21 is located on the top side of the slope 6; the rear column pile 22 is located on the toe side of the slope 6. The lower ends of the front column pile 21 and the rear column pile 22 are embedded in the stratum below the slope protection structure 1, and the upper ends of the front column pile 21 and the rear column pile 22 are symmetrically distributed and connected to the bottom end of the lower support 23. The jack 24 is located between the upper support 25 and the lower support 23. The lower end of the jack 24 is fixed to the top center of the lower support 23 by bolts, and the upper end of the jack 24 is in rigid contact with the circular hole groove opened in the center of the bottom end of the upper support 25. The top of the upper support 25 supports the seismic isolation component 26.

[0047] The elevated structure 3 includes steel pipe piles 31, a capping beam 32, scissor bracing 33, vertical fireproof insulation board 34, horizontal fireproof insulation board 35, an isolation layer 36, a protective layer 37, a structural layer 38, a soil layer 39, and a foundation 310. The lower end of the steel pipe piles 31 is embedded in the soil at the toe of the slope 6. The upper end of the steel pipe piles 31 is anchored to the capping beam 32. The scissor bracing 33 is fixedly connected to the steel pipe piles 31. Specifically, the scissor bracing 33 is connected to the steel pipe piles 31 by welding to ensure lateral stability. The vertical fireproof insulation board 34 is located inside the steel pipe piles 31, and the two are fixed by nails. The vertical fireproof insulation board 34 is arranged vertically along the toe of the slope. The foundation 310 is located inside the top of the slope 6. The horizontal fireproof insulation board 35, isolation layer 36, protective layer 37, structural layer 38, and plain soil layer 39 are distributed from bottom to top. The right ends of the horizontal fireproof insulation board 35, isolation layer 36, protective layer 37, and structural layer 38 are all anchored in the cap beam 32; the left ends of the horizontal fireproof insulation board 35, isolation layer 36, protective layer 37, and structural layer 38 are all anchored in the foundation 310. Preferably, the thickness of the vertical fireproof insulation board 34 and the horizontal fireproof insulation board 35 is not less than 300 mm, the thickness of the isolation layer 36 and the protective layer 37 is not less than 100 mm, the thickness of the structural layer 38 is not less than 400 mm, and the thickness of the plain soil layer 39 is not less than 500 mm. They also have a 3% slope towards the outside of the foundation pit to prevent rainwater from flowing into the foundation pit. Preferably, the capping beam 32 and the foundation 310 are reinforced concrete structures. The width of the capping beam 32 should be greater than the diameter of the steel pipe pile 31, and greater than 100mm on both sides. The thickness and width of the foundation 310 should not be less than 600mm. The fireproof insulation board can be made of rock wool calcium silicate board, the protective layer material can be polyurethane, and the isolation layer material can be geotextile. In another embodiment of this invention, see... Figure 1 It also includes a power generation and heating system 4, which comprises a photovoltaic panel array 41, a steel support 42, a control box 44, and a constant temperature heating control device 45. The bottom of the steel support 42 is fixedly connected to the structural layer 38; the top of the steel support 42 supports the photovoltaic panel array 41, which converts light energy into electrical energy and stores it in an energy storage device via an inverter 43. The energy storage device, control box 44, and constant temperature heating control device 45 are electrically connected. The heating pipe 46 is connected to the constant temperature heating control device 45. The heating pipe 46 can also be powered by mains electricity. The heating pipe 46 can be an electric heating pipe, controlled by the constant temperature heating control device 45 to provide heat to the underground pipe 5; the heating pipe 46 can also be a water pipe, controlled by the constant temperature heating control device 45 to provide heat to the underground pipe 5.

[0048] The underground pipeline is reinforced and supported by the upper support 25 and the lower support 23. The slope protection structure 1 is used to support the slope of the foundation pit 61, which avoids the problems of high investment cost, long construction period and easy environmental pollution of traditional support structures. At the same time, the upper support 25 and the lower support 23 are steel structure components. The characteristics of steel structure materials are lightweight, high strength, green environmental protection, recyclability and low cost. In addition, steel structure has good seismic performance, which can reduce the disturbance of construction vibration to underground pipeline. By supporting the underground pipeline 5 with vertical steel pipe piles 31 and elevating it with a horizontal overhead structure 3, the underground pipeline 5 protected by the supporting and protective structure 2 below is isolated from the outside world, preventing disturbance and vibration from external objects and forces. On the other hand, it makes full use of the horizontal space formed by the overhead structure after the slope 6 is excavated. By installing a photovoltaic panel array 41 on the upper part of the overhead structure 3, the solar energy generated is used to generate heat and connect to the heating pipe 46 to provide heat to the sealed space below, which is enclosed by vertical and horizontal fireproof insulation boards, preventing the underground pipeline 5 from freezing. It utilizes clean and efficient solar energy, which is green and pollution-free, achieving self-generation and self-consumption, and eliminating the burden of electricity consumption during peak periods.

[0049] By reinforcing the underground pipeline 5 within the impact range of the foundation pit in advance through the support and protection structure 2, and then setting the slope protection structure 1 on the slope surface of the slope 6 inside the foundation pit, the triangular prism space formed by the excavation is supported by the vertical steel pipe piles 31 at the slope foot and the horizontal elevated layer structure 3, which on the one hand protects the underground pipeline 5 from external disturbance, and on the other hand makes full use of the upper space; in addition, the lower part of the elevated layer structure 3 is enclosed by the horizontal fireproof insulation board 35 and the vertical fireproof insulation board 34 to form a closed space; at the same time, the top space of the elevated layer structure 3 is fully utilized to install a photovoltaic panel array 41, which generates heat energy by connecting the load through the photovoltaic panel array 41 and connecting the heating pipe 46 to provide heat to the closed space below the elevated layer structure 3, preventing the underground pipeline 5 from freezing.

[0050] In another embodiment of this example, see Figure 5 and Figure 6 The horizontal position of the front column pile 21 and the rear column pile 22 of each supporting and protective structure 2 is located between two adjacent rectangular grooves 11; the depth of the rectangular groove 11 is the same as the diameter of the heating pipe 46.

[0051] In another embodiment of this example, see Figure 1 and Figure 5The front column pile 21 and the rear column pile 22 are hollow steel pipes. Their embedment depth must meet the stability requirements and the settlement requirements under the action of the upper load. The front column pile 21 and the rear column pile 22 are symmetrically distributed on both sides of the underground pipeline 5, and the spacing is greater than the pipe diameter. The lower support 23 and the upper support 25 are both rectangular steel structure components. The upper support 25 has an arc-shaped groove at the top center to limit the lateral displacement of the upper anti-vibration component 26 and ensure that the two are in rigid contact.

[0052] In another embodiment of this example, see Figure 1 and Figure 4 The shock-absorbing component 26 includes an outer steel plate 261, an inner steel shell plate 262, and a fastener 263. The inner steel shell plate 262 is made of soft plastic steel and is in the shape of a two-way arc. The inner side of the arc is in rigid contact with the underground pipeline 5 being protected, and the outer side of the arc is fixed to the outer steel plate 261 by the fastener 263.

[0053] In another embodiment of this example, see Figure 1 , Figure 5 and Figure 7 The steel pipe piles 31 are intermittently arranged in the transverse direction along the toe of the slope 6. Their embedment depth must meet the settlement requirements under the action of the upper vertical load and the displacement requirements under the action of the horizontal load. The foundation 310 is "L" shaped. The upper part of the flat end of the foundation 310 is equipped with embedded parts 313. The left side of the horizontal fireproof insulation board 35, the isolation layer 36, the protective layer 37 and the structural layer 38 are all provided with round holes. The embedded parts 313 pass through the round holes and are fixed by the sealing anchor head 314.

[0054] In another embodiment of this example, see Figure 1 and Figure 7 A micro anchor pile 311 is provided at the center of the bottom end of the foundation 310, and an anchor rod 312 is provided on the lower back side of the foundation 310. Preferably, the micro anchor pile 311 and the anchor rod 312 are made of grade III steel with a diameter of 16mm, and the anchoring end is bent into a hook inside the reinforced concrete, with the hook length being no less than 35 times the diameter.

[0055] In another embodiment of this example, see Figure 1 and Figure 3 The structural layer 38 is made of steel plate, and a pre-embedded part is installed in the center of the structural layer 38. The bottom end of the steel bracket 42 is fixedly installed with the pre-embedded part.

[0056] In another embodiment of this example, see Figure 1 and Figure 2The slope protection structure 1 is a 100mm thick reinforced concrete structure. Inside the slope protection structure 1, there are parallel slope 6 longitudinal and transverse structural bars with a diameter of 8mm, and diagonal reinforcing bars with a diameter of 16mm at 45° and 135°. A heat insulation component is installed between the slope protection structure 1 and the heating pipe 46 to prevent thermal expansion of the slope protection structure 1.

[0057] In another embodiment of this example, see Figure 1 and Figure 3 The front column pile 21 and the rear column pile 22 are steel pipes; the upper support 25 and the lower support 23 are steel structural components; the structural layer 38 is a steel plate; the front column pile 21, the rear column pile 22, the steel pipe pile 31, the upper support 25, the lower support 23, the structural layer 38 and the steel bracket 42 are all coated with anti-corrosion paint to prevent rust.

[0058] Example 2, see Figures 1-8 The present invention also provides a construction method for an underground pipeline support structure within a foundation pit, comprising the following steps:

[0059] S1. Preparatory work before construction:

[0060] The material, cross-sectional dimensions, purpose, planar location, and burial depth of underground pipeline 5 were detected.

[0061] The underground pipeline is simplified as a simply supported beam, and the support spacing is determined according to the load and deformation requirements.

[0062] S2. Based on the determined support spacing, intermittently excavate trenches perpendicular to the underground pipeline 5.

[0063] S3. Lay out and position the front column pile 21 and the rear column pile 22, place the drilling rig, mechanically drill holes, install the front column pile 21 and the rear column pile 22, grout, check the pile position, and carry out pull-out test and inspection after the curing period is completed.

[0064] S4. Install the lower support 23 and fix it to the front column pile 21 and the rear column pile 22 by welding. After installation, install the jack 24 at the center of the top of the lower support 23. After installation, install the upper support 25.

[0065] S5. Install the shock-absorbing component 26. After installation, adjust the jack 24 to make the upper support 25 rigidly connected to the shock-absorbing component 26.

[0066] S6. The slope 6 is excavated in layers and sections by mechanical and manual means, sprayed with concrete, tied with steel mesh, and sprayed with concrete again. After the curing period is reached, the slope is inspected. During the process, rectangular grooves 11 are left intermittently. After the inspection is completed, the heating pipe 46 is installed in the rectangular grooves 11.

[0067] S7. Lay out the steel pipe pile positions at the toe of slope 6, place the piles at the bottom of the foundation pit, mechanically drill holes, install steel pipe piles 31, correct the pile positions during the process, after installation, check the pile positions, install vertical fireproof insulation boards 34, and fix them with nails; at the same time, excavate the foundation trench at the top of slope 6, pour the foundation 310 with embedded parts 313, and set micro anchor piles 311 and anchor bolts 312 during the process.

[0068] S8. Install horizontal fireproof insulation board 35, isolation layer 36, protective layer 37, and structural layer 38 from bottom to top. At the same time, tie the crown beam reinforcement on the right side and pour the crown beam concrete. Seal the anchor on the left side through the anchor head 314.

[0069] S9. Install steel bracket 42, photovoltaic panel array 41, inverter 43, control box 44, constant temperature heating control device 45, connect constant temperature heating control device 45 and heating pipe 46, fill with water and test, generate electricity and provide heating.

[0070] The present invention also includes at least the following advantages:

[0071] This invention utilizes hollow steel pipes as the front and rear column piles 21 and 22, whose embedment depth must meet stability requirements and settlement requirements under upper loads. The front and rear column piles 21 and 22 are symmetrically distributed on both sides of the underground pipeline 5, with a spacing greater than the pipe diameter. The lower support 23 and upper support 25 are both rectangular steel structural components. An arc-shaped groove is provided at the center of the top of the upper support 25 to restrict the lateral displacement of the upper anti-vibration component 26 and ensure rigid contact between the two. The steel pipe piles 31 are arranged intermittently along the toe of the slope 6, and their embedment depth must meet the settlement requirements under upper vertical loads and the displacement requirements under horizontal loads. The foundation 310 is L-shaped, and a pre-embedded part 313 is installed on the upper part of the flat end of the foundation 310. Circular holes are provided on the left side of the horizontal fireproof insulation board 35, isolation layer 36, protective layer 37, and structural layer 38. The pre-embedded part 313 passes through the circular holes and is fixed by the sealing anchor head 314. The slope protection structure 1 is a 100mm thick reinforced concrete structure. Inside the slope protection structure 1, there are structural bars with a diameter of 8mm in the horizontal and longitudinal directions of the slope 6, and reinforcing bars with a diameter of 16mm at 45° and 135° in the diagonal directions. A heat insulation component is installed between the slope protection structure 1 and the heating pipe 46 to prevent thermal expansion of the slope protection structure 1.

[0072] The underground pipeline is reinforced and supported by the upper support 25 and the lower support 23. The slope protection structure 1 is used to support the slope of the foundation pit 61, which avoids the problems of high investment cost, long construction period and easy environmental pollution of traditional support structures. At the same time, the upper support 25 and the lower support 23 are steel structure components. The characteristics of steel structure materials are lightweight, high strength, green environmental protection, recyclability and low cost. In addition, steel structure has good seismic performance, which can reduce the disturbance of construction vibration to underground pipeline. By supporting the underground pipeline 5 with vertical steel pipe piles 31 and elevating it with a horizontal overhead structure 3, the underground pipeline 5 protected by the supporting and protective structure 2 below is isolated from the outside world, preventing disturbance and vibration from external objects and forces. On the other hand, it makes full use of the horizontal space formed by the overhead structure after the slope 6 is excavated. By installing a photovoltaic panel array 41 on the upper part of the overhead structure 3, heat is generated by solar power or provided by the mains electricity and connected to the heating pipe 46 to provide heat to the enclosed space below, which is enclosed by vertical and horizontal fireproof insulation boards, preventing the underground pipeline 5 from freezing. It utilizes clean and efficient solar energy, is green and pollution-free, achieves self-generation and self-consumption, and eliminates the burden of electricity consumption during peak periods.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A support structure for underground pipelines within a foundation pit, characterized in that, include: A slope protection structure (1) is provided on the slope surface of the slope (6) inside the foundation pit. The slope protection structure (1) is provided with a number of rectangular grooves (11) intermittently along the longitudinal direction. A heating pipe (46) is installed in the number of rectangular grooves (11). A supporting and protective structure (2) is provided in sequence in the foundation pit. The supporting and protective structures (2) are used to support the underground pipeline (5). The supporting and protective structure (2) includes a front column pile (21), a rear column pile (22), a lower support (23), a jack (24), an upper support (25), and a seismic isolation component (26). The front column pile (21) is located on the top side of the slope (6). The rear column pile (22) is located on the toe side of the slope (6). The front column pile (21) and the rear column pile (22) 2) The lower end is embedded in the stratum below the slope protection structure (1). The upper ends of the front column pile (21) and the rear column pile (22) are symmetrically distributed and connected to the bottom end of the lower support (23). The jack (24) is located between the upper support (25) and the lower support (23). The lower end of the jack (24) is fixed at the top center of the lower support (23). The upper end of the jack (24) is in rigid contact with the bottom end of the upper support (25). The top end of the upper support (25) supports the anti-seismic component (26). The elevated floor structure (3) includes steel pipe piles (31), a capping beam (32), scissor bracing (33), a vertical fireproof insulation board (34), a horizontal fireproof insulation board (35), an isolation layer (36), a protective layer (37), a structural layer (38), a soil layer (39), and a foundation (310). The lower end of the steel pipe pile (31) is embedded in the stratum at the toe of the slope (6). The upper end of the steel pipe pile (31) is anchored to the capping beam (32). The scissor bracing (33) is fixedly connected to the steel pipe pile (31). The vertical fireproof insulation board (34) is located inside the steel pipe pile (31). On the side, the vertical fireproof insulation board (34) is arranged vertically along the toe of the slope; the foundation (310) is set inside the top of the slope (6); the horizontal fireproof insulation board (35), isolation layer (36), protective layer (37), structural layer (38) and plain soil layer (39) are distributed from bottom to top, and the right ends of the horizontal fireproof insulation board (35), isolation layer (36), protective layer (37) and structural layer (38) are all anchored in the cap beam (32); the left ends of the horizontal fireproof insulation board (35), isolation layer (36), protective layer (37) and structural layer (38) are all anchored in the foundation (310).

2. The underground pipeline support structure within the foundation pit according to claim 1, characterized in that, Also includes: The power generation and heating system (4) includes a photovoltaic panel array (41), a steel bracket (42), a control box (44), and a constant temperature heating control device (45); the bottom end of the steel bracket (42) is fixedly connected to the structural layer (38); the top end of the steel bracket (42) supports the photovoltaic panel array (41), and the photovoltaic panel array (41) converts light energy into electrical energy and stores it in an energy storage device through an inverter (43); the energy storage device, the control box (44), and the constant temperature heating control device (45) are electrically connected; the heating pipe (46) is connected to the constant temperature heating control device (45).

3. The underground pipeline support structure within the foundation pit according to claim 1, characterized in that, The horizontal position of the front column (21) and rear column (22) of each of the supporting protective structures (2) is between two adjacent rectangular grooves (11); the depth of the rectangular grooves (11) is the same as the diameter of the heating pipe (46).

4. The underground pipeline support structure within the foundation pit according to claim 1, characterized in that, The front column pile (21) and the rear column pile (22) are hollow steel pipes. The front column pile (21) and the rear column pile (22) are symmetrically distributed on both sides of the underground pipeline (5). The lower support (23) and the upper support (25) are both rectangular steel structure components. The upper support (25) has an arc-shaped groove at the center of its top end to limit the lateral displacement of the upper shock-absorbing component (26).

5. The underground pipeline support structure within the foundation pit according to claim 1, characterized in that, The shock-absorbing component (26) includes an outer steel plate (261), an inner steel shell plate (262), and a fastener (263); the inner steel shell plate (262) is made of soft plastic steel and is in the shape of a two-way arc. The inner side of the arc is in rigid contact with the underground pipeline (5) being protected, and the outer side of the arc is fixed to the outer steel plate (261) through the fastener (263).

6. The underground pipeline support structure within the foundation pit according to claim 1, characterized in that, The steel pipe piles (31) are arranged intermittently along the toe of the slope (6). The foundation (310) is L-shaped. An embedded part (313) is installed on the upper part of the flat end of the foundation (310). The left side of the horizontal fireproof insulation board (35), isolation layer (36), protective layer (37) and structural layer (38) are all provided with round holes. The embedded part (313) passes through the round hole and is fixed by the sealing anchor head (314). A micro anchor pile (311) is provided at the center of the bottom end of the foundation (310). An anchor rod (312) is provided on the lower back side of the foundation (310).

7. The underground pipeline support structure within the foundation pit according to claim 1, characterized in that, The slope protection structure (1) is a reinforced concrete structure with a thickness of 100mm. The slope protection structure (1) has parallel slope (6) with longitudinal and transverse diameter of 8mm structural bars and inclined 45° and 135° diameter reinforcing bars with a diameter of 16mm inside. A heat insulation component is installed between the slope protection structure (1) and the heating pipe (46).

8. The underground pipeline support structure within the foundation pit according to claim 1, characterized in that, The front column pile (21), rear column pile (22), steel pipe pile (31), upper support (25), lower support (23), structural layer (38) and steel bracket (42) are all coated with anti-corrosion paint.

9. A construction method for an underground pipeline support structure within a foundation pit as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Detect the material, cross-sectional dimensions, purpose, planar location and burial depth of the underground pipeline (5); The underground pipeline is simplified as a simply supported beam, and the support spacing is determined according to the load and deformation requirements. S2. Based on the determined support spacing, intermittently excavate trenches perpendicular to the underground pipeline (5); S3. Lay out and position the front column pile (21) and the rear column pile (22), mechanically drill holes, place the front column pile (21) and the rear column pile (22), grout, pile position detection, and carry out pull-out test and inspection after the curing period is reached; S4. Install the lower support (23) and fix it to the front column pile (21) and the rear column pile (22) by welding. After installation, install the jack (24) at the center of the top of the lower support (23). After installation, install the upper support (25). S5. Install the shock-absorbing component (26). After installation, adjust the jack (24) to make the upper support (25) and the shock-absorbing component (26) rigidly connected. S6. Mechanical and manual excavation of slope (6) in layers and sections, spraying concrete, binding steel mesh, spraying concrete again, and testing after the curing period is reached. During the process, rectangular grooves (11) are left intermittently. After the test is completed, heating pipes (46) are installed in the rectangular grooves (11). S7. Lay out the position of the steel pipe pile at the toe of the slope (6), place the pile foundation at the bottom of the pit, mechanically drill holes, install the steel pipe pile (31), correct the pile position during the process, after installation, check the pile position, install the vertical fireproof insulation board (34), and fix it with nails; at the same time, excavate the foundation trench at the top of the slope (6), pour the foundation (310) with the embedded part (313), and set up micro anchor piles (311) and anchor bolts (312) during the process. S8. Install horizontal fireproof insulation board (35), isolation layer (36), protective layer (37), and structural layer (38) from bottom to top. At the same time, tie the crown beam reinforcement on the right side and pour the crown beam concrete. Seal the anchor on the left side through the anchor head (314). S9. Install steel bracket (42), photovoltaic panel array (41), inverter (43), control box (44), constant temperature heating control device (45), connect constant temperature heating control device (45) and heating pipe (46), fill with water and test, generate electricity and provide heating.

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