Prefabricated thermal insulating socket and spigot corrugated reinforced steel cylinder concrete composite pipe and its design method

Abstract

The present application belongs to the technical field of heating pipeline, and particularly relates to a prefabricated thermal insulation socket and spigot corrugated reinforced steel cylinder concrete composite pipe and a design method thereof. In view of the technical problems of strong destructive effect of high internal and external pressure, prominent thermal strain damage under large temperature difference working condition, and serious corrosion in high temperature and high humidity environment, the present application proposes a prefabricated thermal insulation socket and spigot corrugated reinforced steel cylinder concrete composite pipe with a structure from outside to inside in turn as a protective layer, a thermal insulation layer, a steel cylinder and an inner lining layer, a socket and spigot structure at a pipe end connection, and double rubber ring sealing for the socket and spigot. The design method of the composite pipe comprises respectively designing the thickness of the steel cylinder, the socket and spigot structure with a stop bolt and a strain compensation groove, the inner lining layer of the composite pipe, and the protective layer and the thermal insulation layer of the composite pipe. Through the present application, the structural design of large-diameter heating pipeline is realized, the problems of high internal and external pressure, large temperature difference thermal strain and high temperature and high humidity corrosion of the heating pipeline are solved, the performance of the heating pipeline for conveying hot water is ensured, the cost is reduced, and the safety is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of heating pipeline, and particularly relates to a prefabricated thermal socket corrugated reinforced steel cylinder concrete composite pipe and a design method thereof. BACKGROUND

[0002] With the advancement of urbanization construction, the heating area of cities and towns is continuously expanded, and the heating pipeline industry is rapidly developed. The design of the structure of the heating pipeline needs to mainly consider the strength problem of large-diameter pipelines under the action of high internal and external pressure, the thermal strain problem under large temperature difference working conditions, and the thermal insulation and corrosion prevention problem under high temperature and high humidity environment. The high-density polyethylene plastic outer protection polyurethane foam prefabricated direct-buried thermal insulation pipe (hereinafter referred to as "prefabricated direct-buried thermal insulation pipe") adopts a three-layer composite structure of steel cylinder, polyurethane rigid foam plastic thermal insulation layer and high-density polyethylene outer protection pipe, and is widely used in the field of municipal central heating due to its low cost, thermal insulation and energy saving, and excellent performance of waterproof and pressure resistance. However, the prefabricated direct-buried thermal insulation pipe has the following shortcomings in actual engineering: 1. The steel cylinder is welded with a joint, which reduces the strength of the weld; 2. The heat strain needs to be compensated by welding corrugated pipes or sleeves between the pipes, which increases the construction cost; 3. The steel cylinder is in a high temperature and high humidity service environment for a long time, and the corrosion risk is increased. SUMMARY

[0003] In order to overcome the above-mentioned deficiencies of the prior art, and in view of the technical problems of strong destructive effect of high internal and external pressure, prominent thermal strain damage under large temperature difference working conditions, and serious corrosion in high temperature and high humidity environment, the present application provides a prefabricated thermal socket corrugated reinforced steel cylinder concrete composite pipe and a design method thereof.

[0004] According to the first aspect of the present application, a prefabricated thermal retaining socket and spigot corrugated reinforced steel cylinder concrete composite pipe is provided, the pipe body part is sequentially provided with a protective layer 7, a thermal retaining layer 1, a steel cylinder 6 and an inner lining layer 9 from outside to inside, the protective layer 7 completely covers the thermal retaining layer 1 in the whole circumference direction, and is firmly adhered to the outer surface of the thermal retaining layer 1 through an adhesive; the thermal retaining layer 1 completely covers the steel cylinder 6 in the whole circumference direction, and the inner surface of the thermal retaining layer 1 is firmly adhered to the outer wall of the steel cylinder 6 through an adhesive; the inner lining layer 9 is densely filled in the inner wall of the steel cylinder 6; a U-shaped corrugated reinforcing structure 8 is pressed on the pipe wall of the steel cylinder 6 and circumferentially surrounds the pipe wall; one end of the pipe is a socket 4, and the other end is a spigot 3; a radial bolt hole is arranged on the end face of the socket 4, the bolt hole penetrates through the outer wall of the socket 4 and communicates with the inner cavity of the pipe, the outer wall of the spigot 3 is provided with a ring-shaped double-U-shaped groove, the front groove is close to the outer edge of the front end of the spigot 3, and the rear groove is away from the outer edge of the front end of the spigot 3; the stop bolt 5 comprises a head part with a relatively wide cross section and a screw rod which is connected with the head part perpendicularly, and the screw rod and the bolt hole of the socket 4 are threadedly connected to form a threaded pair; when the pipe is connected, the spigot 3 is inserted into the socket 4 to a designed depth, the screw rod of the stop bolt 5 is screwed into the bolt hole until the lower surface of the head part of the stop bolt 5 is tightly attached to the inner wall of the socket 4, the rear groove is a sliding groove of the stop bolt 5, the bottom end of the screw rod of the stop bolt 5 penetrates through the outer wall of the socket 4 and falls into the rear groove of the spigot 3, and can slide in the axial direction of the pipe to form axial stop and circumferential anti-rotation locking; when the socket 4 and the spigot 3 are connected, a double-rubber-ring seal is formed between the socket 4 and the spigot 3, the double-rubber-ring seal comprises an L-shaped rubber ring 2 and a T-shaped rubber ring 10, the L-shaped rubber ring is arranged in the gap between the end face of the socket 4 and the top end of the spigot 3, and the T-shaped rubber ring is embedded in the front groove of the spigot 3, and the flange of the T-shaped rubber ring is tightly attached to the inner wall of the socket 4 to form a seal.

[0005] According to the second aspect of the present application, a design method of a prefabricated thermal retaining socket and spigot corrugated reinforced steel cylinder concrete composite pipe is provided, which comprises the following steps:

[0006] Step one, design the thickness of the steel cylinder wall;

[0007] Step two, design the socket and spigot structure with a stop bolt and a strain compensation groove;

[0008] Step three, design the inner lining layer of the composite pipe, which is composed of cement mortar or reinforced concrete;

[0009] Step four, design the thermal retaining layer and the protective layer of the composite pipe, the thermal retaining layer is composed of hard polyurethane foam plastic, and the protective layer is composed of high-density polyethylene.

[0010] The present application has the following beneficial effects:

[0011] The prefabricated thermal bell and spigot corrugated reinforced steel cylinder concrete composite pipe and the design method thereof provide a systematic design method for large-diameter heating pipelines, first analyze the circumferential tensile stress of the steel cylinder wall under internal pressure conditions to design the thickness of the steel cylinder wall, then design the bell and spigot structure with a retreat-preventing bolt and a strain compensation groove, and finally design the steel cylinder lining layer (cement mortar or reinforced concrete), the thermal insulation layer (hard polyurethane foam plastic) and the protective layer (high-density polyethylene). The method is used to design a 200-1600 mm diameter heating pipeline.

[0012] The thickness of the steel cylinder wall is designed under internal pressure conditions, which not only ensures the internal pressure strength of the heating pipeline, but also saves the amount of steel; the heating pipeline with four-layer composite structure from outside to inside, i.e., the high-density polyethylene layer, the polyurethane hard foam plastic layer, the steel cylinder and the lining layer composed of cement mortar or reinforced concrete, not only improves the strength against external pressure, but also enhances the thermal insulation performance; the bell and spigot structure with a retreat-preventing bolt and a strain compensation groove is designed, which not only solves the problem of reduced strength at the connection of the traditional welded pipeline, but also compensates the thermal strain through the sliding of the retreat-preventing bolt along the strain compensation groove, saves the installation of the compensator and reduces the construction cost. The cement mortar or reinforced concrete lining avoids the direct contact of hot water with the steel cylinder, effectively improves the corrosion resistance of the heating pipeline. Through the present application, the structural design of the large-diameter heating pipeline is realized, the technical problems of strong destructive high internal and external pressure, prominent thermal strain damage under large temperature difference conditions and serious corrosion under high temperature and high humidity environment are solved, the performance of the heating pipeline for conveying hot water is ensured, the cost is reduced and the safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The prefabricated thermal bell and spigot corrugated reinforced steel cylinder concrete composite pipe (the lining layer is composed of cement mortar);

[0014] Figure 2 The prefabricated thermal bell and spigot corrugated reinforced steel cylinder concrete composite pipe (the lining layer is composed of reinforced concrete);

[0015] Figure 3 The prefabricated thermal bell and spigot corrugated reinforced steel cylinder concrete composite pipe design method of the present application.

[0016] The drawings show that: 1 is a thermal insulation layer, 2 is an L-shaped rubber ring, 3 is a spigot, 4 is a bell, 5 is a retreat-preventing bolt, 6 is a steel cylinder, 7 is a protective layer, 8 is a U-shaped corrugated reinforcing structure, 9 is a lining layer, 10 is a T-shaped rubber ring, 11 is a steel reinforcement cage, 12 is a bell first section horn, 13 is a bell second section horn, 14 is a bell third section horn. DETAILED DESCRIPTION

[0017] To make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of the present disclosure.

[0018] In some embodiments, as shown in Figure 1 and 2 , the present application provides a prefabricated thermal socket and spigot port corrugated reinforced steel cylinder concrete composite pipe, the pipe body part is sequentially covered from outside to inside by a protective layer 7, a thermal insulation layer 1, a steel cylinder 6 and an inner lining layer 9, the protective layer 7 completely covers the thermal insulation layer 1 in the whole circumference, and is firmly adhered to the outer surface of the thermal insulation layer 1 through an adhesive; the thermal insulation layer 1 completely covers the steel cylinder 6 in the whole circumference, and the inner surface of the thermal insulation layer 1 is firmly adhered to the outer wall of the steel cylinder 6 through an adhesive; the inner lining layer 9 is densely filled in the inner wall of the steel cylinder 6; a U-shaped corrugated reinforcing structure 8 is pressed on the pipe wall of the steel cylinder 6 and surrounds the pipe wall in the circumferential direction; one end of the pipe is a socket 4, and the other end is a spigot 3; a radial bolt hole is arranged on the end face of the socket 4, the bolt hole penetrates through the outer wall of the socket 4 and communicates with the inner cavity of the pipe, and the outer wall of the spigot 3 is provided with a ring-shaped double-U-shaped groove, the front groove is close to the outer edge of the front end of the spigot 3, and the rear groove is away from the outer edge of the front end of the spigot 3; the stop bolt 5 includes a head part with a relatively wide cross section and a screw rod connected perpendicularly to the head part, and the screw rod and the bolt hole of the socket 4 are threadedly connected to form a threaded pair; when the pipe is connected, the spigot 3 is inserted into the socket 4 to a designed depth, the screw rod of the stop bolt 5 is screwed into the bolt hole until the lower surface of the head part of the stop bolt 5 is tightly attached to the inner wall of the socket 4, the rear groove is a sliding groove of the stop bolt 5, the bottom end of the screw rod of the stop bolt 5 penetrates through the outer wall of the socket 4 and falls into the rear groove of the spigot 3, and can slide in the axial direction of the pipe to form axial stop and circumferential anti-rotation locking; when the socket 4 and the spigot 3 are butt-jointed, a double-gasket seal is formed between the socket 4 and the spigot 3, the double-gasket seal includes an L-shaped gasket 2 and a T-shaped gasket 10, the L-shaped gasket is arranged in the gap between the end face of the socket 4 and the top end of the spigot 3, and the T-shaped gasket is embedded in the front groove of the spigot 3, and the flange of the T-shaped gasket is tightly attached to the inner wall of the socket 4 to form a seal.

[0019] Preferably, the protective layer 7 is a high-density polyethylene layer, and the thermal insulation layer 1 is a polyurethane rigid foam plastic layer;

[0020] Preferably, the inner lining layer 9 is composed of cement mortar or reinforced concrete, and when the inner lining layer 9 is composed of reinforced concrete, a steel cage 11 is embedded in the layer;

[0021] Preferably, the designed depth is the depth of the insertion of the spigot into the socket until the distance between the stop bolt and the left end of the rear groove is 20 L mm, and the depth of the insertion of the spigot into the socket is the distance between the stop bolt and the right end of the rear groove.L the total length of the pipe body of the composite pipe, the thermal expansion coefficient of the composite pipe.

[0022] In some embodiments, as Figure 3 shown, the application provides a design method of a prefabricated thermal socket and spigot corrugated reinforced steel cylinder concrete composite pipe, comprising the following steps:

[0023] Step one, design the thickness of the steel cylinder wall;

[0024] Step two, design the socket and spigot structure with a stop bolt and a strain compensation groove;

[0025] Step three, design the inner lining layer of the composite pipe, which is composed of cement mortar or reinforced concrete;

[0026] Step four, design the thermal insulation layer and the protective layer of the composite pipe, the thermal insulation layer is composed of rigid polyurethane foam, and the protective layer is composed of high-density polyethylene.

[0027] Preferably, the step one, the design of the thickness of the steel cylinder wall, is specifically:

[0028] Calculate the hoop tensile stress of the pipe under the action of internal pressure p , and calculate the thickness of the steel cylinder wall by using a uniform pipe cylinder model t :

[0029] ;

[0030] wherein, p is the internal pressure, D is the internal diameter of the steel cylinder, is the design yield stress.

[0031] Preferably, the internal pressure p is 1.2-2.1 MPa.

[0032] Preferably, the internal diameter of the steel cylinder D is 200-1600 mm.

[0033] Preferably, the selected steel material is Q355 or Q420 steel material, and the corresponding yield stress is 355 MPa or 420 MPa, and the design yield stress is 60% of the yield stress of the corresponding material.

[0034] Preferably, a double-U-shaped corrugation is arranged on the surface of the steel cylinder.

[0035] Preferably, the step two, the design of the socket and spigot structure with a stop bolt and a strain compensation groove, is specifically:

[0036] First, the socket structure is designed, which is made of Q355 or Q420 steel plate roll forming into three sections of trumpet shape and welded to the outer wall of the steel cylinder; the steel plate thickness of the socket structure is 5-12 mm, and the total length is 180-220 mm. As shown in Figure 1 and 2 , the first section of the trumpet 12 is in close contact with the outer wall of the steel cylinder, and the length accounts for 7-8% of the total length; the inner diameter of the second section of the trumpet 13 is 4-6 mm larger than that of the first section of the trumpet 12, and the length accounts for 70-76% of the total length; the third section of the trumpet 14 is an outwardly expanding shape, and the included angle with the second section of the trumpet 13 is 10-15°, and the length accounts for 17-22% of the total length. A stop bolt hole is provided at the junction of the second section of the trumpet 13 and the third section of the trumpet 14 for screwing in a M20 stop bolt.

[0037] Then the socket structure is designed, which is composed of double U-shaped grooves and directly formed on the steel cylinder wall. The outer edge close to the front end of the socket is the front groove, and the outer edge away from the front end of the socket is the rear groove. The distance between the front groove and the outer edge of the front end of the socket is 45-60 mm, and the groove depth is 8-10 mm. The rear groove serves as a strain compensation groove, and the distance between the front groove and the rear groove is 50-75 mm, the depth is 4-8 mm, and the width is d :

[0038] ;

[0039] Among them, the thermal expansion coefficient of the composite pipe, L the total length of the pipe body of the composite pipe, and ΔT is the temperature change of the composite pipe.

[0040] Preferably, the total length of the pipe body of the composite pipe L is 6000-12000 mm.

[0041] Preferably, the thermal expansion coefficient of the composite pipe is 8×10 -6 -12×10 -6 / ℃.

[0042] Preferably, the temperature change ΔT of the composite pipe is 100-120℃.

[0043] The sealing performance of the socket and the socket is guaranteed by the double rubber rings. The L-shaped rubber ring is placed in the gap between the end face of the socket and the top end of the socket, and the T-shaped rubber ring is arranged in the front groove of the socket. When the socket is inserted into the socket, the L-shaped rubber ring is compressed, and when the distance between the stop bolt and the left end of the strain compensation groove is 20 L mm, the stop bolt is tightened, so that the second section of the trumpet of the socket and the socket maintain a spacing of 5-8 mm.

[0044] Preferably, the L-shaped rubber ring is hollow, and the compression ratio is 35%-45%.

[0045] Preferably, the step three, designing the inner liner of the composite pipe, the inner liner is made of cement mortar or reinforced concrete, in particular:

[0046] The inner liner is made of cement mortar or reinforced concrete, when the inner diameter of the steel cylinder is 200-800mm, the inner liner is made of cement mortar, the thickness is 10-15mm; when the inner diameter of the steel cylinder is 900-1000mm, the inner liner is made of cement mortar, the thickness is 20-30mm; when the inner diameter of the steel cylinder is 1000-1200mm, the inner liner is made of cement mortar and the thickness is 20-30mm or the inner liner is made of reinforced concrete and the thickness is 55-65mm; when the inner diameter of the steel cylinder is 1200-1400mm, the inner liner is made of reinforced concrete, the thickness is 65-70mm; when the inner diameter of the steel cylinder is 1400-1600mm, the inner liner is made of reinforced concrete, the thickness is 70-85mm.

[0047] Preferably, the step four, designing the thermal insulation layer and the protective layer of the composite pipe, the thermal insulation layer is made of rigid polyurethane foam, the protective layer is made of high-density polyethylene, in particular:

[0048] The thermal insulation layer is made of rigid polyurethane foam layer, the protective layer is made of high-density polyethylene layer, when the inner diameter of the steel cylinder is 200-500mm, the thermal insulation layer is made of rigid polyurethane foam and the thickness is 42-55mm, the protective layer is made of high-density polyethylene outer layer and the thickness is 4-7mm; when the inner diameter of the steel cylinder is 500-900mm, the thermal insulation layer is made of rigid polyurethane foam and the thickness is 55-59mm, the protective layer is made of high-density polyethylene and the thickness is 7-10mm; when the inner diameter of the steel cylinder is 1000-1200mm, the thermal insulation layer is made of rigid polyurethane foam and the thickness is 59-65mm, the protective layer is made of high-density polyethylene and the thickness is 11-13mm; when the inner diameter of the steel cylinder is 1200-1600mm, the thermal insulation layer is made of rigid polyurethane foam and the thickness is 65-104mm, the protective layer is made of high-density polyethylene and the thickness is 13-20mm.

[0049] The embodiment lists the design size of the partial prefabricated thermal insulation socket and spigot reinforced steel cylinder concrete composite pipe structure when the internal pressure p is 2.1MPa, the inner liner is cement mortar as shown in Table 1, the inner liner is reinforced concrete as shown in Table 2.

[0050] Table 1

[0051]

[0052] Table 2

[0053]

[0054] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made to the present application shall be included in the protection scope of the present application.

Claims

1. A precast insulated socket corrugated reinforced steel cylinder concrete composite pipe, characterized in that, The pipe body consists of a protective layer, an insulation layer, a steel cylinder, and an inner lining layer, arranged from the outside to the inside. The protective layer completely covers the insulation layer circumferentially and is firmly bonded to the outer surface of the insulation layer with adhesive. The insulation layer completely covers the steel cylinder circumferentially, and its inner surface is firmly bonded to the outer wall of the steel cylinder with adhesive. The inner lining layer densely fills the inner wall of the steel cylinder. A U-shaped corrugated reinforcement structure is pressed onto the pipe wall of the steel cylinder, encircling the pipe wall circumferentially. One end of the pipe is a socket, and the other end is a spigot. A radial bolt hole is provided on the end face of the socket, which penetrates the outer wall of the socket and communicates with the inner cavity of the pipe. The outer wall of the spigot has a circumferential double U-shaped groove, with the front groove closest to the outermost edge of the spigot and the rear groove furthest from the outermost edge of the spigot. The anti-reverse bolt includes a head with a relatively wide cross-section. The screw is perpendicularly connected to the head, and the screw and the threaded engagement of the bolt hole in the socket form a threaded pair. When connecting the pipe, the spigot is inserted into the socket to the designed depth, and the screw of the anti-reverse bolt is screwed into the bolt hole until the lower surface of the head of the anti-reverse bolt is pressed against the inner wall of the socket. The rear groove is the sliding groove of the anti-reverse bolt. The bottom end of the anti-reverse bolt passes radially through the outer wall of the socket and falls into the rear groove of the spigot, and can slide along the pipe axis to form axial anti-reverse and circumferential anti-rotation locking. When the socket and spigot are connected, a double rubber ring seal is formed between the socket and the spigot. The double rubber ring includes an L-shaped rubber ring and a T-shaped rubber ring. The L-shaped rubber ring is placed in the gap between the end face of the socket and the top of the spigot, and the T-shaped rubber ring is embedded in the front groove of the spigot. Its flange is pressed against the inner wall of the socket to form a seal.

2. The prefabricated insulated socket corrugated reinforced steel cylinder concrete composite pipe according to claim 1, characterized in that, The inner diameter of the steel cylinder ranges from 200 to 1600 mm, and the total length of the composite pipe is from 6000 to 12000 mm.

3. The prefabricated insulated socket corrugated reinforced steel cylinder concrete composite pipe according to claim 1, characterized in that, The steel cylinder is made of Q355 or Q420 steel, with a corresponding yield stress of 355MPa or 420MPa.

4. The prefabricated insulated socket corrugated reinforced steel cylinder concrete composite pipe according to claim 1, characterized in that, The inner lining is made of cement mortar or reinforced concrete. When the inner lining is made of reinforced concrete, a steel cage is embedded in the layer.

5. The design method of the prefabricated insulated socket corrugated reinforced steel cylinder concrete composite pipe according to any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Design the steel cylinder wall thickness; Step 2: Design a socket structure with anti-reverse bolts and strain compensation grooves; Step 3: Design the inner lining of the composite pipe, which is composed of cement mortar or reinforced concrete; Step 4: Design the insulation layer and protective layer of the composite pipe. The insulation layer is made of rigid polyurethane foam, and the protective layer is made of high-density polyethylene.

6. The design method for the prefabricated insulated socket corrugated reinforced steel cylinder concrete composite pipe according to claim 5, characterized in that, The first step, designing the steel cylinder wall thickness, specifically involves calculating the internal pressure. p The circumferential tensile stress of the tube under action is calculated using a uniform tube model to determine the steel cylinder wall thickness. t : ； in, p For internal pressure, D The inner diameter of the steel cylinder To design the yield stress.

7. The design method for the prefabricated insulated socket corrugated reinforced steel cylinder concrete composite pipe according to claim 5, characterized in that, The socket structure is made of Q355 or Q420 steel plate rolled into three flared sections and welded to the outer wall of the steel cylinder. The steel plate of the socket structure has a thickness of 5-12mm and a total length of 180-220mm. The first flared section is close to the outer wall of the steel cylinder and accounts for 7%-8% of the total length. The inner diameter of the second flared section is 4-6mm larger than that of the first flared section and accounts for 70%-76% of the total length. The third flared section is outwardly flared and has an angle of 10°-15° with the second flared section, accounting for 17%-22% of the total length. A locking bolt hole is provided at the junction of the second and third flared sections for screwing in a locking bolt.

8. The design method for the prefabricated insulated socket corrugated reinforced steel cylinder concrete composite pipe according to claim 5, characterized in that, The socket structure has a double U-shaped circumferential groove on its outer wall, which is directly pressed into shape on the steel cylinder wall. The groove closest to the outermost front edge of the socket is the front groove, and the groove furthest from the outermost front edge is the rear groove. The front groove is 45-60mm from the outermost front edge of the socket and has a depth of 8-10mm. The rear groove is a strain compensation groove, 50-75mm from the front groove, with a depth of 4-8mm and a width of [missing information]. d : ； in, The coefficient of thermal expansion of the composite pipe is... L Let ΔT be the total length of the composite pipe, and ΔT be the temperature change of the composite pipe.

9. The design method for the prefabricated insulated socket corrugated reinforced steel cylinder concrete composite pipe according to claim 5, characterized in that, The design of the inner lining layer of the steel cylinder in step three is as follows: when the inner diameter of the steel cylinder is 200~800mm, the inner lining layer is composed of cement mortar with a thickness of 10~15mm; when the inner diameter of the steel cylinder is 900~1000mm, the inner lining layer is composed of cement mortar with a thickness of 20~30mm; when the inner diameter of the steel cylinder is 1000~1200mm, the inner lining layer is composed of cement mortar with a thickness of 20~30mm or the inner lining layer is composed of reinforced concrete with a thickness of 55-65mm; when the inner diameter of the steel cylinder is 1200~1400mm, the inner lining layer is composed of reinforced concrete with a thickness of 65-75mm; when the inner diameter of the steel cylinder is 1400~1600mm, the inner lining layer is composed of reinforced concrete with a thickness of 75-85mm.

10. The design method for the prefabricated insulated socket corrugated reinforced steel cylinder concrete composite pipe according to claim 5, characterized in that, Step four, designing the insulation and protective layers of the steel cylinder, specifically involves the following: When the inner diameter of the steel cylinder is 200-500mm, the insulation layer is made of rigid polyurethane foam with a thickness of 42-55mm, and the protective layer is made of high-density polyethylene with a thickness of 4-7mm; when the inner diameter of the steel cylinder is 500-900mm, the insulation layer is made of rigid polyurethane foam with a thickness of 55-59mm, and the protective layer is made of high-density polyethylene with a thickness of 7-10mm; when the inner diameter of the steel cylinder is 1000-1200mm, the insulation layer is made of rigid polyurethane foam with a thickness of 59-65mm, and the protective layer is made of high-density polyethylene with a thickness of 11-13mm; when the inner diameter of the steel cylinder is 1200-1600mm, the insulation layer is made of rigid polyurethane foam with a thickness of 65-104mm, and the protective layer is made of high-density polyethylene with a thickness of 13-20mm.

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