First pasting method stainless steel concrete pouring structure and construction method

Abstract

A back rib and a plurality of embedded parts are arranged on the outer surface of a U-shaped prefabricated steel covering face, the lower end of the U-shaped prefabricated steel covering face is arranged on a bottom plate support, an inner formwork system is arranged on the U-shaped inner side of the prefabricated steel covering face and used for abutting against the inner side of the prefabricated steel covering face to form a pipe ditch inner contour, and an outer formwork system is arranged on the outer side of the U-shaped prefabricated steel covering face and used for abutting against the inner side of the prefabricated steel covering face to form a pipe ditch inner contour. The inner formwork system is used for abutting against the outer side of a reinforcement cage to form a pipe ditch outer contour, and the inner formwork system and the outer formwork system are connected through opposite-pull screws to form a pipe ditch pouring cavity. A concrete sleeper beam is further arranged above the inner formwork system and used for resisting buoyancy borne by the prefabricated steel covering face during concrete pouring. The construction method comprises the steps of prefabricating the steel covering plate, hoisting and positioning, installing the template system, arranging the counter weight, pouring concrete and sealing the hole. The problems that the steel cladding concrete pouring construction quality is unstable, and the construction efficiency is low are solved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a pre-pasting stainless steel concrete casting structure and a construction method. Background Art

[0002] In the process of nuclear power plant construction, the underground pipe gallery full steel cladding or steel tray concrete structure construction part is crucial. Among them, the post-pasting method as a construction process has many drawbacks that cannot be ignored.

[0003] Post-pasting construction has extremely high requirements on the technical level of workers. There are a large number of embedded parts and anchoring components distributed on the full steel cladding. The installation accuracy of these components is directly related to the stability and safety of the entire structure. Insufficient skills of workers may lead to problems such as position deviation of embedded parts and loose installation of anchoring components, which will bury hidden dangers for subsequent projects. The long construction period is also a significant disadvantage of the post-pasting method. Since the construction of full steel cladding involves many complex processes, it takes a lot of time to handle a large number of embedded parts and anchoring components, and the construction period is significantly extended. The production efficiency is low, the workers' on-site splicing and welding process is cumbersome and time-consuming, the production cost is high, the welding materials and equipment have high requirements, and are easily affected by the personal conditions of the workers and the constraints of the construction environment, making it difficult to ensure the stability of the construction quality. At the same time, the environmental impact of the construction site also has a certain impact on the protection of the finished steel cladding products.

[0004] With the advancement of technology, a series of new steel covering, steel tray, embedded parts welding and assembly processes and methods, as well as the overall hoisting construction process of steel covering have been studied and applied in the current stage of steel structure. The steel covering can be processed and manufactured in a backstage assembly line and hoisted to the construction site as a whole. The first pasting method saves a lot of manpower and material resources, improves construction efficiency, and reduces the dependence on the construction technology of concrete workers. Summary of the invention

[0005] The main purpose of the present invention is to provide a stainless steel concrete pouring structure and a construction method for first pasting method, so as to solve the problems of unstable construction quality and low construction efficiency of steel facing concrete pouring.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a stainless steel concrete casting structure by the first pasting method, the outer surface of the U-shaped prefabricated steel covering is provided with a back rib and a plurality of embedded parts, the lower end of which is arranged on the bottom plate support, the inner side of the U-shaped prefabricated steel covering is provided with an inner template system, which is used to abut against the inner side of the prefabricated steel covering to form the inner contour of the pipe trench, and the outer side of the prefabricated steel covering is provided with an outer template system, which is used to abut against the outer side of the steel cage to form the outer contour of the pipe trench, and the inner template system and the outer template system are connected by a tension screw to form a pipe trench casting cavity; A concrete sleeper beam is also provided above the inner formwork system to resist the buoyancy of the prefabricated steel covering during concrete pouring.

[0007] In the preferred embodiment, the inner formwork system includes an inner main beam and an inner secondary beam, the length of the inner secondary beam is equal to the length of the pipe channel, a plurality of inner secondary beams are evenly arranged on the inner surface of the prefabricated steel cladding U-shaped, the length of the inner main beam is adapted to the cross-sectional size of the pipe channel, a plurality of inner main beams are evenly spaced along the length direction of the pipe channel, the inner main beam is perpendicular to the inner secondary beam, and abuts against the inner secondary beam; Alternatively, the U-shaped inner bottom surface of the prefabricated steel covering is provided with an inclined surface, and a plurality of leveling wooden wedges are provided at the intersection of the inner main beam and the inner secondary beam of the bottom surface, so as to evenly transfer the load borne by the inner main beam to the prefabricated steel covering.

[0008] In a preferred embodiment, the inner formwork system further comprises an inner support frame, the size of which is adapted to the inner contour of the trench, the lower end of the support frame rests against the inner main beam via an adjustable bottom support, and a plurality of concrete sleeper beams are arranged at the upper end of the inner support frame.

[0009] In the preferred embodiment, the length direction of the concrete sleeper beam is parallel to the length direction of the pipe trench, and the concrete sleeper beam is arranged along the horizontal direction of the pipe trench, and the spacing and number of the concrete sleepers are adapted to the structure of the inner support frame.

[0010] In a preferred embodiment, the inner support frame includes a plurality of inner cross bars and inner vertical bars, and the inner cross bars and inner vertical bars are connected by buckles to form a rectangular frame structure. The ends of the cross bars and vertical bars at the edge of the rectangular frame structure rest against the inner surface of the prefabricated steel covering, so that the concrete sleeper beam counterweight is evenly applied to the prefabricated steel covering.

[0011] In the preferred embodiment, the external formwork system includes a panel, an outer secondary beam, an outer main beam, a protective wall and a diagonal brace. The panel is against the two sides of the outer contour of the trench. The length of the outer secondary beam is equal to the full length of the trench, and its length direction is parallel to the full length of the trench. A plurality of outer secondary beams are arranged at equal intervals along the height direction of the upper end of the panel, and a plurality of outer main beams are arranged at equal intervals along the length direction of the trench. The outer main beam is perpendicular to the outer secondary beam. A protective wall is arranged at the lower end of the panel, and a diagonal brace is also arranged on the outside of the protective wall for positioning against and fixing the outer contour of the external formwork system.

[0012] In the preferred embodiment, cross bars are symmetrically provided at the upper ends of both sides of the trench, and the two ends of the cross bars are respectively connected to the upper ends of the outer main beam and the inner main beam through fasteners. A plurality of tension screws are provided in the height direction from the cross bars to the bottom surface of the prefabricated steel covering. The tension screws pass through the casting cavity on the side of the trench and are respectively connected to the outer main beam and the inner main beam at both ends.

[0013] In a preferred embodiment, the external formwork system also includes a connecting mechanism, through which the external formwork support frame is connected to the surrounding wall, and is used to support and fix the external formwork support frame with a height-to-width ratio greater than 2. The connecting mechanism is a combination of one or more wall connecting parts, guy wires or steel ropes.

[0014] In a preferred embodiment, a vibration hole array is provided on the prefabricated steel cladding bottom plate, and the vibration holes are arranged in a non-overlapping area between adjacent inner support frame support points, and a gap is maintained between the edge of the vibration hole and the edge of any support frame support point.

[0015] In the preferred embodiment, a construction method of a stainless steel concrete pouring structure by a first pasting method comprises: S1. Steel cladding processing: prefabricated steel cladding and back ribs are made separately in the factory, embedded parts are installed on the designed points on the outer surface of the prefabricated steel cladding, back ribs and prefabricated steel cladding are welded into a U-shaped whole, and the whole is pickled and passivated; S2. Hoisting and positioning: Install the bottom plate support and tie it to the trench reinforcement cage for reinforcement. Use a truck crane to hoist the prefabricated steel cladding onto the bottom plate support as a whole; S3. Install the formwork system: set up the inner formwork system and the outer formwork system according to the cross-sectional size of the trench, and securely tie the prefabricated steel cladding, the inner formwork system, the outer formwork system and the trench reinforcement cage; S4. Arrange counterweight: according to the buoyancy calculation, evenly arrange the concrete sleepers on the inner formwork system, avoiding the vibration holes; S5. Concrete pouring: pour from the vibrating hole, the trench is formed as a whole at one time, and after pouring to the designed elevation, knock on the prefabricated steel covering to check the density, and vibrate evenly; S6. Hole sealing: After pouring is completed, weld the steel cover plate at the vibrating hole.

[0016] The present invention provides a pre-pasting stainless steel concrete casting structure and construction method, which improves the construction efficiency: prefabricated steel coverings and embedded parts are processed on the factory assembly line, reducing on-site splicing and welding processes and shortening the construction period; the overall lifting technology is used to greatly improve the construction efficiency and avoid the cumbersome process of traditional post-pasting installation layer by layer.

[0017] Reduce dependence on workers' skills: Standardized prefabrication process reduces human operation errors. The formwork system and counterweight layout are realized through unified design parameters, which reduces dependence on the technical level of on-site workers and ensures the stability of construction quality.

[0018] Enhance the anti-buoyancy and stability of the structure: The inner formwork system is equipped with a concrete pillow-beam counterweight, which is combined with a support frame and tension screw connection to effectively resist the buoyancy generated during concrete pouring and prevent deformation or displacement of the prefabricated steel covering; the reinforcement design of the back ribs and embedded parts further improves the overall structural rigidity.

[0019] Improve the density and quality of concrete: Vibration holes are opened in the prefabricated steel cladding bottom plate to eliminate the blind area of ​​vibration and ensure the density of concrete pouring; the tapping inspection and hole sealing process after pouring ensure the integrity and anti-seepage performance of the trench bottom plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a plan view of a single chamber of the trench in Example 1 of the present invention with a cross section less than 2400 mm; Figure 2 It is a cross-sectional view of a single chamber of a trench in Example 1 of the present invention with a cross section less than 2400 mm; Figure 3 It is a plan view of a single bin of the trench in Example 2 of the present invention with a cross section greater than 2400 mm and less than 3500 mm; Figure 4 It is a cross-sectional view of a single chamber of a trench in Example 2 of the present invention with a cross section greater than 2400 mm and less than 3500 mm; Figure 5 It is a node diagram of the prefabricated steel cladding and wall formwork support of the present invention; Figure 6 It is a schematic diagram of the support frame of the present invention having a height of no more than 8m; Figure 7 The height of the support frame of the present invention is not more than 8m plan view; Figure 8 It is a schematic diagram of the template and support frame erection of the present invention; Fig. 9 is an elevation view of the base plate support of the present invention; Fig.10 It is an elevation view of the installation of the prefabricated steel cladding and the base plate support of the present invention; Fig.11 It is an axonometric structural diagram of the prefabricated steel cladding of the present invention.

[0021] In the figure: prefabricated steel covering 1; vibrating hole 101; back rib 2; embedded parts 3; bottom plate support 4; internal formwork system 5; internal main beam 501; internal secondary beam 502; leveling wooden wedge 503; internal support frame 504; internal cross bar 5041; internal vertical bar 5042; buckle 5043; adjustable bottom support 505; external formwork system 6; panel 601; external secondary beam 602; external main beam 603; protective wall 604; diagonal brace 605; tension screw 7; concrete pillow beam 8; cross bar 9; connecting mechanism 10; wall connecting piece 1001; guy brace 1002; wire rope 1003. DETAILED DESCRIPTION

[0022] Example 1 like Figure 1~25-11, a stainless steel concrete casting structure of the first pasting method, the outer surface of the U-shaped prefabricated steel covering 1 is provided with a back rib 2 and a plurality of embedded parts 3, the lower end of which is arranged on the bottom plate support 4, the inner side of the U-shaped prefabricated steel covering 1 is provided with an inner formwork system 5, which is used to abut against the inner side of the prefabricated steel covering 1 to form the inner contour of the pipe trench, and the outer side of the prefabricated steel covering 1 is provided with an outer formwork system 6, which is used to abut against the outer side of the steel cage to form the outer contour of the pipe trench, and the inner formwork system 5 and the outer formwork system 6 are connected by a tension screw 7 to form a pipe trench casting cavity; A concrete sleeper beam 8 is also provided above the inner formwork system 5 to resist the buoyancy exerted on the prefabricated steel cladding 1 during concrete pouring.

[0023] In this application, based on the cross-sectional form and structural dimensions of the radioactive waste liquid covered pipe trench, combined with the construction site environment and construction progress, the prefabricated steel covering 1 and the embedded parts 3 are installed in advance in the covered pipe trench, and concrete is poured so that the covered pipe trench is formed as a whole once.

[0024] In view of the deformation of the prefabricated steel cladding 1: during processing, an angle steel back rib 2 is added to the outer back of the cladding, and during civil construction, an internal support is added inside the cladding, and a counterweight is added on the upper part of the internal support to prevent deformation of the cladding and displacement of the cladding due to buoyancy.

[0025] To address concrete quality risks such as hollowing and bulging: choose to open holes in the covering on the base plate to eliminate blind areas of vibration. This can also eliminate the gas generated in the process of pouring concrete on the base plate, ensure the compactness of the bottom plate of the covering trench and the construction quality of the concrete, and ensure that the covering trench can be formed as a whole at one time. After the concrete pouring is completed, you only need to weld a stainless steel plate on the covering hole.

[0026] In the preferred embodiment, the inner formwork system 5 includes an inner main beam 501 and an inner secondary beam 502. The length of the inner secondary beam 502 is equal to the length of the pipe channel. A plurality of inner secondary beams 502 are evenly arranged on the inner surface of the prefabricated steel cladding 1U shape. The length of the inner main beam 501 is adapted to the cross-sectional size of the pipe channel. A plurality of inner main beams 501 are evenly spaced along the length of the pipe channel. The inner main beam 501 is perpendicular to the inner secondary beam 502 and abuts against the inner secondary beam 502. Alternatively, the U-shaped inner bottom surface of the prefabricated steel covering 1 is provided with an inclined surface, and a plurality of leveling wooden wedges 503 are provided at the intersection of the inner main beam 501 and the inner secondary beam 502 of the bottom surface, so as to evenly transfer the load borne by the inner main beam 501 to the prefabricated steel covering 1.

[0027] When the cross section of a single trench is ≤2400mm, the trench frame has a horizontal distance of 1500mm, a vertical distance of 900mm, and a step distance of 1500mm. The inner secondary beam 502 on the prefabricated steel cladding 1 bottom plate is made of 50*100mm wooden squares, arranged along the long direction of the trench, with a spacing of 250mm. The inner main beam 501 is made of double 50*100*2mm rectangular steel pipes, arranged along the short direction of the trench, with a spacing of 900mm.

[0028] In the preferred embodiment, the inner formwork system 5 also includes an inner support frame 504 whose size is adapted to the inner contour of the trench. The lower end of the support frame 504 rests against the inner main beam 501 through an adjustable base 505, and a plurality of concrete pillow beams 8 are arranged on the upper end of the inner support frame 504.

[0029] In the preferred embodiment, the length direction of the concrete sleeper beam 8 is parallel to the length direction of the pipe trench, and the concrete sleeper beam 8 is arranged along the horizontal direction of the pipe trench, and the spacing and number of the concrete sleeper beams are adapted to the structure of the inner support frame 504.

[0030] In the preferred embodiment, the inner support frame 504 includes a plurality of inner cross bars 5041 and inner vertical bars 5042, and the inner cross bars 5041 and the inner vertical bars 5042 are connected by buckles 5043 to form a rectangular frame structure. The ends of the cross bars 5041 and the vertical bars 5042 at the edge of the rectangular frame structure rest against the inner surface of the prefabricated steel covering 1, so that the counterweight of the concrete sleeper beam 8 is evenly applied to the prefabricated steel covering 1.

[0031] The inner formwork system 5 uses cross-shaped limiting steel bars and spot welding with a spacing of 800mm on the bottom plate and wall reinforcement of the prefabricated steel covering 1. The transverse steel bars control the top elevation of the bottom plate, the longitudinal steel bars control the outer edge of the wall, and the formwork rests on the limiting steel bars.

[0032] The counterweight adopts a 150mm*150mm*2000mm concrete pillow beam 8. The number of counterweights is calculated according to the concrete buoyancy and evenly distributed on the inner support frame 504, avoiding the prefabricated steel covering 1 bottom plate vibration hole 101. According to the overall construction deployment of the trench project, the bottom plate and wall concrete are cast in one step. In order to avoid deformation of the prefabricated steel covering 1 on the bottom plate surface during concrete pouring, a counterweight is set on the frame to resist the buoyancy generated during the pouring of the bottom plate concrete. The setting principle of the concrete pillow beam 8 is: when the horizontal distance of the frame is 900mm, 2 concrete pillow beams 8 are set on each horizontal bar, and they are arranged along the long direction of the trench; when the horizontal distance of the frame is 1500mm, 3 concrete pillow beams are set on each horizontal bar, and they are arranged along the long direction of the trench.

[0033] In the preferred embodiment, the external formwork system 6 includes a panel 601, an outer secondary beam 602, an outer main beam 603, a protective wall 604 and a diagonal brace 605. The panel 601 is against both sides of the outer contour of the trench. The length of the outer secondary beam 602 is equal to the full length of the trench, and its length direction is parallel to the full length of the trench. A plurality of outer secondary beams 602 are evenly spaced along the height direction of the upper end of the panel 601, and a plurality of outer main beams 603 are evenly spaced along the length direction of the trench. The outer main beam 603 is perpendicular to the outer secondary beam 602. A protective wall 604 is provided at the lower end of the panel 601, and a diagonal brace 605 is also provided on the outside of the protective wall 604 for positioning against and fixing the outer contour of the external formwork system 6.

[0034] In the preferred embodiment, cross bars 9 are symmetrically provided at the upper ends of both sides of the trench, and the two ends of the cross bars 9 are respectively connected to the upper ends of the outer main beam 603 and the inner main beam 501 through fasteners. A plurality of tension screws 7 are provided in the height direction from the cross bars 9 to the bottom surface of the prefabricated steel covering 1. The tension screws 7 pass through the casting cavity on the side of the trench and are respectively connected to the outer main beam 603 and the inner main beam 501 at the two ends.

[0035] A Φ48mm steel pipe cross bar 9 is added above the main beam, and the cross bar 9 is connected to the main beam with fasteners. The upper part of the hanging formwork is tied to the upper transverse steel bars with a concrete pad with steel bars, and the lower part of the formwork is supported with a top support with a spacing of 800mm. In a preferred embodiment, an array of vibration holes 101 is provided on the bottom plate of the prefabricated steel cladding 1, and the vibration holes 101 are arranged in the non-overlapping area between the support points of adjacent inner support frames 504, and the edges of the vibration holes 101 are spaced from the edges of any support point of the support frame 504.

[0036] When the cross-section of a single trench is ≤2400mm, a row of 200*200mm vibration holes 101 should be opened on the bottom plate of the prefabricated steel covering 1, and the adjacent spacing of the vibration holes 101 is 2500mm.

[0037] Example 2 Further illustrate with reference to Example 1, Figure 3~4 For the structure shown, when the cross section of a single trench is greater than 2400 and less than or equal to 3500mm, the trench frame has a horizontal distance of 900mm, a vertical distance of 900mm, and a step distance of 1500mm. The inner secondary beam 502 on the bottom plate of the prefabricated steel cladding 1 is made of 50*100mm wooden squares, arranged along the long direction of the trench with a spacing of 250mm. The inner main beam 501 is made of double 50*100*2mm rectangular steel pipes, arranged along the short direction of the trench with a spacing of 900mm. Two rows of 200*200mm concrete vibration holes should be opened on the bottom plate of the prefabricated steel cladding 1, and the adjacent spacing between the vibration holes is 2500mm.

[0038] Example 3 Further description is given in conjunction with Example 1 and Example 2. Figure 8In the structure shown, the external formwork system 6 also includes a connecting mechanism 10, through which the external formwork support frame is connected to the surrounding wall, and is used to support and fix the external formwork support frame with a height-to-width ratio greater than 2. The connecting mechanism 10 is a combination of one or more of the wall connecting parts 1001, the guying 1002 or the wire rope 1003.

[0039] When the aspect ratio of the external support frame of the external formwork system 6 is greater than 2, wall connecting pieces 1001 are set at horizontal intervals of 6 to 9 meters and vertical intervals of 4 to 6 meters around the outer side of the frame. When the wall connecting pieces 1001 cannot be set, measures such as setting a castor 1002 or tensioning and fixing with a steel wire rope 1003 should be adopted. When supporting the wall formwork, formwork support and adjustable top support on both sides can be used. Since the relative clearance of the pipe trench is small, in order to meet the needs of on-site construction, diagonal braces can be set according to the actual situation on site, and the sweeping rods are installed before pouring concrete.

[0040] Example 4 Further illustrate with reference to Examples 1, 2, and 3. Figures 1 to 11 The structure shown is a construction method of a stainless steel concrete pouring structure by a first pasting method, the method comprising: S1. Steel cladding processing: prefabricated steel cladding 1 and back rib 2 are manufactured separately in the factory, embedded parts 3 are installed on the designed points on the outer surface of prefabricated steel cladding 1, back rib 102 and prefabricated steel cladding 1 are welded into a U-shaped whole, and the whole is pickled and passivated; S2, hoisting and positioning: install the bottom plate support 4, and tie it to the trench steel cage for reinforcement, and use a truck crane to hoist the prefabricated steel cladding 1 as a whole onto the bottom plate support 4; S3. Install the formwork system: set up the inner formwork system 5 and the outer formwork system 6 according to the cross-sectional size of the trench, and firmly tie the prefabricated steel cladding 1, the inner formwork system 5, the outer formwork system 6 and the trench reinforcement cage; S4. Arrange counterweight: evenly arrange concrete sleepers 8 on the inner formwork system 5 according to buoyancy calculation, avoiding the vibrating holes 101; S5. Concrete pouring: pour from the vibrating hole 101, the pipe trench is formed in one step, and after pouring to the designed elevation, knock on the prefabricated steel cover 1 to check the compactness, and vibrate evenly; S6. Hole sealing: After pouring is completed, a steel cover plate is welded at the vibrating hole 101.

[0041] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A stainless steel concrete pouring structure with a first pasting method, characterized by: The outer surface of the U-shaped prefabricated steel cladding (1) is provided with a back rib (2) and a plurality of embedded parts (3), the lower end of which is arranged on a base plate support (4); the inner side of the U-shape of the prefabricated steel cladding (1) is provided with an inner formwork system (5) for abutting against the inner side of the prefabricated steel cladding (1) to form an inner contour of the pipe trench; the outer side of the prefabricated steel cladding (1) is provided with an outer formwork system (6) for abutting against the outer side of the steel cage to form an outer contour of the pipe trench; the inner formwork system (5) and the outer formwork system (6) are connected via a tension screw (7) to form a pipe trench casting cavity; A concrete pillow beam (8) is also provided above the inner formwork system (5) to resist the buoyancy exerted on the prefabricated steel covering (1) during concrete pouring.

2. According to claim 1, a stainless steel concrete pouring structure is characterized by: The inner formwork system (5) comprises an inner main beam (501) and an inner secondary beam (502), the length of the inner secondary beam (502) being equal to the length of the pipe channel, a plurality of inner secondary beams (502) being evenly arranged on the U-shaped inner surface of the prefabricated steel cladding (1), the length of the inner main beam (501) being adapted to the cross-sectional size of the pipe channel, a plurality of inner main beams (501) being evenly spaced along the length direction of the pipe channel, the inner main beam (501) being perpendicular to the inner secondary beam (502) and resting against the inner secondary beam (502); Alternatively, the U-shaped inner bottom surface of the prefabricated steel cladding (1) is provided with an inclined surface, and a plurality of leveling wooden wedges (503) are provided at the intersection of the inner main beam (501) and the inner secondary beam (502) of the bottom surface, so as to evenly transfer the load borne by the inner main beam (501) to the prefabricated steel cladding (1).

3. According to claim 1, a stainless steel concrete pouring structure is characterized by: The inner formwork system (5) further comprises an inner support frame (504) whose size matches the inner profile of the pipe trench; the lower end of the support frame (504) abuts against the inner main beam (501) via an adjustable bottom support (505); and a plurality of concrete sleeper beams (8) are arranged on the upper end of the inner support frame (504).

4. According to claim 3, a stainless steel concrete pouring structure according to the first pasting method is characterized in that: The length direction of the concrete sleeper beam (8) is parallel to the length direction of the pipe trench. The concrete sleeper beam (8) is arranged along the horizontal direction of the pipe trench, and the spacing and number of the concrete sleeper beams are adapted to the structure of the inner support frame (504).

5. According to claim 3, a stainless steel concrete pouring structure according to the first pasting method is characterized in that: The inner support frame (504) comprises a plurality of inner cross bars (5041) and inner vertical bars (5042), wherein the inner cross bars (5041) and the inner vertical bars (5042) are connected via buckles (5043) to form a rectangular frame structure, wherein the ends of the cross bars (5041) and the vertical bars (5042) at the edge of the rectangular frame structure abut against the inner surface of the prefabricated steel covering (1), so that the counterweight of the concrete sleeper beam (8) is evenly applied to the prefabricated steel covering (1).

6. According to claim 1, the stainless steel concrete pouring structure is characterized by: The external formwork system (6) comprises a panel (601), an external secondary beam (602), an external main beam (603), a protective wall (604) and a diagonal brace (605); the panel (601) is against two sides of the outer contour of the pipe trench; the length of the external secondary beam (602) is equal to the full length of the pipe trench, and its length direction is parallel to the full length of the pipe trench; a plurality of external secondary beams (602) are arranged at equal intervals at the upper end of the panel (601) along its height direction; a plurality of external main beams (603) are arranged at equal intervals along the length direction of the pipe trench; the external main beam (603) is perpendicular to the external secondary beam (602); a protective wall (604) is arranged at the lower end of the panel (601); and a diagonal brace (605) is also arranged on the outer side of the protective wall (604) for abutting and fixing the outer contour of the external formwork system (6) in position.

7. The stainless steel concrete pouring structure according to claim 6 is characterized by: Cross bars (9) are symmetrically arranged at the upper ends of both sides of the pipe trench, and the two ends of the cross bars (9) are respectively connected to the upper ends of the outer main beam (603) and the inner main beam (501) through fasteners. A plurality of tension screws (7) are arranged in the height direction from the cross bars (9) to the bottom surface of the prefabricated steel covering (1), and the tension screws (7) pass through the casting cavity on the side of the pipe trench and are respectively connected to the outer main beam (603) and the inner main beam (501) at the two ends.

8. The stainless steel concrete pouring structure according to claim 6 is characterized by: The external formwork system (6) further comprises a connection mechanism (10), through which the external formwork support frame is connected to the surrounding wall, and is used to support and fix the external formwork support frame having a height-to-width ratio greater than 2, wherein the connection mechanism (10) is a combination of one or more of a wall connection member (1001), a brace (1002) or a steel wire rope (1003).

9. The stainless steel concrete pouring structure according to claim 1 is characterized by: An array of vibration holes (101) is provided on the bottom plate of the prefabricated steel cladding (1), wherein the vibration holes (101) are arranged in a non-overlapping area between supporting points of adjacent inner supporting frames (504), and a spacing is maintained between the edge of the vibration hole (101) and the edge of any supporting point of the supporting frame (504).

10. The construction method of a stainless steel concrete pouring structure according to any one of claims 1 to 9, characterized in that: The method includes: S1. Steel cladding processing: Prefabricated steel cladding (1) and back rib (2) are manufactured separately in the factory, embedded parts (3) are installed at the designed points on the outer surface of the prefabricated steel cladding (1), the back rib (2) and the prefabricated steel cladding (1) are welded into a U-shaped whole, and the whole is pickled and passivated; S2, hoisting and positioning: installing the bottom plate support (4), and tying and reinforcing it with the trench reinforcement cage, and using a truck crane to hoist the prefabricated steel cladding (1) as a whole onto the bottom plate support (4); S3, installing the formwork system: setting up the inner formwork system (5) and the outer formwork system (6) according to the cross-sectional dimensions of the trench, and firmly tying the prefabricated steel cladding (1), the inner formwork system (5), the outer formwork system (6) and the trench reinforcement cage; S4. Arrange counterweight: according to the buoyancy calculation, evenly arrange concrete sleepers (8) on the inner formwork system (5), avoiding the vibration holes (101); S5. Concrete pouring: pouring from the vibrating hole (101), the trench is formed in one step, and after pouring to the designed elevation, the prefabricated steel covering (1) is knocked to check the compactness, and the concrete is vibrated evenly; S6. Hole sealing: After pouring is completed, a steel cover plate is welded at the vibrating hole (101).

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