Cable passing buried structure of thermal power plant and construction method of cable passing buried structure

Abstract

The invention relates to the technical field of buried cables, in particular to a thermal power plant cable passing buried structure and a construction method thereof. The invention provides a thermal power plant cable passing buried structure. The thermal power plant cable passing buried structure comprises a cable part; the broken stone parts are arranged on the two sides of the cable part; the compacted sand layer is arranged above the cable part, and the gravel parts are arranged on the two sides of the compacted sand layer; the plain concrete cushion layer is arranged above the compacted sand layer and the gravel part; and the reinforced concrete layer is arranged above the plain concrete cushion layer. According to the technical scheme, through the arrangement of the gravel part, the compacted sand layer, the plain concrete cushion layer and the reinforced concrete layer, the cable part is protected, and when a large piece needs to be transported, the safety of the cable part can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of buried cable technology, and in particular to a buried cable crossing structure for thermal power plants and its construction method. Background Technology

[0002] For large-scale thermal power plants (600MW, 1000MW), due to the requirements for transporting and installing heavy components, large-tonnage crawler cranes are needed around the boiler area and surrounding roads. Due to time constraints, cables around the boiler must be laid simultaneously; therefore, the wheel load caused by the large-tonnage crawler cranes must be considered for cables in this area. Summary of the Invention

[0003] The primary objective of this invention is to provide a buried structure for power plant cables crossing roads. This buried structure protects the cable section by incorporating a gravel section, a compacted sand layer, a plain concrete cushion layer, and a reinforced concrete layer, ensuring the safety of the cable section when large components need to be transported.

[0004] The second objective of this invention is to provide a construction method for a buried cable structure for power plants, which aims to solve the technical problem of ensuring the safety of the cable section when large components need to be transported.

[0005] This invention provides a buried structure for power plant cables crossing roads, comprising: a cable section;

[0006] A crushing section is provided on both sides of the cable section;

[0007] A compacted sand layer is disposed above the cable section, with the crushed stone section on both sides of the compacted sand layer;

[0008] Plain concrete cushion layer, wherein the plain concrete cushion layer is disposed above the compacted sand layer and the crushed stone section;

[0009] A reinforced concrete layer is disposed above the plain concrete cushion layer.

[0010] Preferably, the top of the compacted sand layer and the top of the crushed stone section are on the same horizontal plane.

[0011] Preferably, the cable section includes a plurality of cable tubes, and an outer protective layer is provided on the outside of the cable tubes, the outer protective layer being high-density polyethylene.

[0012] Preferably, the thickness of the compacted sand layer is 600 mm.

[0013] Preferably, the thickness of the plain concrete cushion layer is 50 mm.

[0014] Preferably, the thickness of the reinforced concrete layer is 500 mm.

[0015] This invention also provides a construction method for buried cable crossing structures in thermal power plants, comprising the following steps:

[0016] S1: Excavate a trench;

[0017] S2: Laying cable conduits;

[0018] S3: Lay and compact a sand layer;

[0019] S4: Lay a plain concrete subbase;

[0020] S5: Lay a reinforced concrete layer.

[0021] More preferably, in step S2, the cable conduit is first wrapped with an outer protective layer.

[0022] More preferably, in step S3, for ordinary ground areas, the thickness of the compacted sand layer is 1.1m.

[0023] More preferably, in step S5, the reinforcing bars are tied before the reinforced concrete layer is laid.

[0024] Beneficial effects:

[0025] The technical solution of this invention protects the cable section by setting up a crushed stone section, a compacted sand layer, a plain concrete cushion layer, and a reinforced concrete layer, ensuring the safety of the cable section when large items need to be transported. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the crawler crane arrangement in the boiler area of ​​the present invention;

[0028] Figure 2 This is a schematic diagram of the cable arrangement in the boiler area of ​​the present invention;

[0029] Figure 3 This is a cross-sectional schematic diagram of the present invention;

[0030] Figure 4 This is a schematic diagram of the underground cable crossing structure in this invention;

[0031] Figure 5This is a schematic diagram of the planar layout of the bottom of the cable well in this invention;

[0032] Figure 6 For the present invention Figure 5 Cross-sectional schematic diagram of BB;

[0033] Figure 7 For the present invention Figure 5 A cross-sectional schematic diagram of AA.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1: Cable section; 101: Outer protective layer;

[0036] 2: Crushed stone section; 3: Compacted sand layer; 4: Plain concrete cushion layer; 5: Reinforced concrete layer; 6: Boiler area. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] like Figures 1 to 7 As shown, the present invention provides a buried structure for power plant cables crossing roads, comprising: a cable section 1, a gravel section 2, the gravel section 2 being disposed on both sides of the cable section 1, a compacted sand layer 3, the compacted sand layer 3 being disposed above the cable section 1, with the gravel section 2 on both sides of the compacted sand layer 3, a plain concrete cushion layer 4, the plain concrete cushion layer 4 being disposed above the compacted sand layer 3 and the gravel section 2, and a reinforced concrete layer 5, the reinforced concrete layer 5 being disposed above the plain concrete cushion layer 4.

[0041] like Figure 1 and Figure 2 The diagrams shown are schematic diagrams of the crawler crane arrangement in boiler area 6 and the cable arrangement in boiler area 6 of this invention. Within the scope of large boiler component transportation and installation (i.e., boiler area 6), 250-1000 ton crawler cranes are used. Within the buried cable arrangement area, crawler cranes with a lifting capacity of 280 tons and a wheel pressure of 613 kPa are deployed. For buried cables, safety cannot be guaranteed without taking appropriate measures.

[0042] The technical solution of the present invention protects the cable section 1 by setting up the crushed stone section 2, the compacted sand layer 3, the plain concrete cushion layer 4 and the reinforced concrete layer 5, and can ensure the safety of the cable section 1 when large items need to be transported.

[0043] The top of the compacted sand layer 3 is on the same horizontal plane as the top of the crushed stone section 2.

[0044] The cable section 1 includes several cable conduits, and an outer protective layer 101 is provided on the outside of the cable conduits. The outer protective layer 101 is made of high-density polyethylene.

[0045] Specifically, in this embodiment, the road surface uses a 500mm thick reinforced concrete surface layer, beneath which is a 50mm thick plain concrete subbase 4, and below that is a 600mm thick compacted sand layer 3. The cable section 1 is protected on both sides with crushed stone. The outer protective layer 101 of the cable is made of high-density polyethylene (HDPE) pipe. Calculations show that the pipe's deflection, buckling stress, and compressive stress all meet the requirements, thus ensuring cable safety.

[0046] This invention also provides a construction method for buried cable crossing structures in thermal power plants, comprising the following steps:

[0047] S1: Excavate a trench;

[0048] S2: Laying cable conduits;

[0049] S3: Lay and compact the sand layer 3;

[0050] S4: Lay plain concrete sub-base 4;

[0051] S5: Lay a reinforced concrete layer 5.

[0052] In step S2, the cable conduit is first wrapped with an outer protective layer 101.

[0053] In step S3, for ordinary ground areas, the thickness of the compacted sand layer 3 is 1.1m.

[0054] In step S5, the reinforcing bars are tied before the reinforced concrete layer 5 is laid.

[0055] Working principle:

[0056] HDPE (High-Density Polyethylene): Outer protective layer 1018mm, outer diameter 174mm, inner diameter 150mm, thickness 12mm.

[0057] Physical properties:

[0058] Density: 0.96 g / cm³ 3 Melting coefficient: 0.7 g / 10 min.

[0059] Mechanical properties:

[0060] Yield strength: 23 N / mm 2 ;

[0061] Elongation at break >600%;

[0062] Flexural creep modulus: 1000 N / mm 2 ;

[0063] Elastic modulus: 155000 kN / m 2 .

[0064] Tracked crane wheel contact area: 1.22m × 6.1m.

[0065] Wheel pressure: 613 kPa.

[0066] When calculating the strength of HDPE, a 45° diffusion of wheel load is considered. HDPE pipes have good heat and cold resistance, as well as high rigidity and toughness, resulting in good mechanical strength. This ensures the safety of the cable.

[0067] The HDPE cable duct is topped with a compacted sand layer (3), with a compaction coefficient required to be ≥0.97. Above this is a plain concrete cushion layer (4) and a calculated 500mm thick reinforced concrete protective slab. The upper and lower sections use 25mm diameter Φ150 and 25mm diameter Φ125 grade III steel bars, respectively, while the vertical reinforcing bars use 12mm diameter Φ250 grade II steel bars to resist the upper wheel load. The sides are protected with graded crushed stone, with a compaction coefficient ≥0.94. This provides protection for the HDPE cable duct from three directions, and the duct's deflection, buckling stress, and compressive stress all meet the requirements.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A buried structure for power plant cables crossing roads, characterized in that, include: Cable Department; A crushing section is provided on both sides of the cable section; A compacted sand layer is disposed above the cable section, with the crushed stone section on both sides of the compacted sand layer; Plain concrete cushion layer, wherein the plain concrete cushion layer is disposed above the compacted sand layer and the crushed stone section; A reinforced concrete layer is disposed above the plain concrete cushion layer.

2. The underground cable crossing structure for thermal power plants according to claim 1, characterized in that, The top of the compacted sand layer and the top of the crushed stone section are on the same horizontal plane.

3. The underground cable crossing structure for thermal power plants according to claim 1, characterized in that, The cable section includes several cable tubes, and the outer protective layer of the cable tubes is provided, which is high-density polyethylene.

4. The underground cable crossing structure for thermal power plants according to claim 1, characterized in that, The thickness of the compacted sand layer is 600 mm.

5. The underground cable crossing structure for thermal power plants according to claim 1, characterized in that, The thickness of the plain concrete cushion layer is 50mm.

6. The underground cable crossing structure for thermal power plants according to claim 1, characterized in that, The thickness of the reinforced concrete layer is 500 mm.

7. A construction method for a buried cable crossing structure for a thermal power plant according to any one of claims 1-6, characterized in that, Includes the following steps: S1: Excavate a trench; S2: Laying cable conduits; S3: Lay and compact a sand layer; S4: Lay a plain concrete subbase; S5: Lay a reinforced concrete layer.

8. The construction method for the buried cable crossing structure of a thermal power plant according to claim 7, characterized in that, In step S2, the cable conduit is first wrapped with an outer protective layer.

9. The construction method for the buried cable crossing structure of a thermal power plant according to claim 7, characterized in that, In step S3, for ordinary ground areas, the thickness of the compacted sand layer is 1.1m.

10. The construction method for the buried cable crossing structure of a thermal power plant according to claim 7, characterized in that, In step S5, the reinforcing bars are tied before the reinforced concrete layer is laid.

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