Cast-in-place pipe gallery construction method

Abstract

The invention relates to a cast-in-place pipe gallery construction method. According to the scheme, the method comprises the following steps that S1, a foundation pit is excavated, and a pre-stressed anchor rod pile plate protection system is constructed; s2, constructing waterproof coiled materials of a foundation pit cushion layer and a bottom plate; s3, pipe gallery bottom plate reinforcing steel bars and concrete are constructed, and comprehensive waterproof treatment is conducted on deformation joints; s4, steel bars of the side walls and the top plate of the pipe gallery are bound, and a lightweight formwork system is erected; s5, concrete pouring is conducted on the side walls and the top plate of the pipe gallery; s6, a waterproof system of the side wall and the top plate of the pipe gallery is constructed; and S7, the pipe gallery fertilizer groove flow state solidified soil is backfilled in a layered mode. According to the cast-in-place pipe gallery construction method, the construction speed is high, the waterproof effect is good, safety and reliability are achieved, meanwhile, the construction effect that the existing line fender posts penetrate through the pipe gallery upwards is achieved, the construction advantages of high stability, high efficiency, high benefits and the like are achieved during implementation, and the technical benefits are remarkable.

Description

Technical Field

[0001] The invention relates to a cast-in-place pipe gallery construction method, belongs to the field of municipal engineering, is suitable for cast-in-place pipe gallery construction, and is particularly suitable for the construction of a curved cast-in-place pipe gallery passing through an existing subway line. Background Art

[0002] Urban integrated underground pipe corridors can effectively solve the current situation of underground pipe lines crossing and being chaotic in cities. According to the principles of green construction, energy conservation and environmental protection of underground space utilization in my country, with the development of pipe corridor construction, pipe corridor construction technology has gradually matured. At present, the pipe corridors that have been built and operated have achieved good social benefits, but many problems have also appeared in the construction process, such as: the heavy pipe corridor template has a low turnover rate, the main structure casting waterproof quality is poor, the existing line retaining pile treatment plan is unreasonable, and the construction process causes pollution to the urban environment.

[0003] On the other hand, the exit of the integrated pipe gallery usually divides the foundation trench into multiple independent backfill sections with complex shapes and narrow spaces, which brings difficulties to the selection of foundation trench backfill technology. Due to the small backfill working surface, mechanical construction is impossible, and the conventional foundation trench backfill technology can only be selected by manual tamping. The existing manual backfilling methods are manual paving, manual hand-held tamping and hand-held roller compaction. The compaction or compaction energy of this process is small, and the fill density does not meet the roadbed quality requirements, especially the suspended part below the exit structure, which cannot be constructed manually. The existing traditional backfill technology is difficult to meet the engineering requirements.

[0004] In view of this, it is urgent to invent a large-diameter shield ventilation shaft system construction method with fast construction speed, high construction safety, and outstanding economic and technical benefits. The present invention proposes a large-diameter shield ventilation shaft system construction method through experimental research, construction materials and construction method comparison, and combines and adopts new components such as steel-concrete prefabricated pedestal, reaction support seat steel frame, roller hydraulic jack, arc support plate, arc water-stop steel plate, etc., and has been verified by multiple projects, which can provide certain technical references for tunnel engineering and has good economic and technical benefits. Summary of the invention

[0005] The purpose of the present invention is to provide a cast-in-place pipe gallery construction method which has fast construction speed, good waterproof effect, safety and reliability, and outstanding economic and technical benefits.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] The cast-in-place pipe gallery construction method includes the following steps:

[0008] S1. Excavation of foundation pit and construction of prestressed anchor pile and board protection system:

[0009] The foundation pit is excavated according to the survey and setting out results. After the foundation pit is excavated, inverted wall panels are constructed on both sides, and prestressed anchor piles are set on the basis of the inverted wall panels. At the same time, a steel support system is installed through the crown beam on the top of the retaining piles. The steel support system consists of multiple steel supports;

[0010] S2. Construction of foundation pit cushion and bottom plate waterproof membrane:

[0011] After manually cleaning and leveling the bottom of the foundation pit, pour plain concrete to level it as the cushion layer of the pipe gallery structure, and lay waterproof membrane on the cushion layer. The waterproof membrane is covered with bentonite waterproof blanket to form a bottom waterproof layer, and then pour fine stone concrete as the bottom fine stone concrete protective layer;

[0012] When there are existing retaining piles at the bottom of the foundation pit, the pile heads are chiseled out, the vertical reinforcement is retained, and a steel casing is constructed on the top of the existing retaining piles, followed by laying waterproofing membranes and pouring a fine stone concrete protective layer.

[0013] S3. Pipe gallery bottom plate reinforcement, concrete construction and comprehensive waterproofing treatment of expansion joints:

[0014] Tie up the steel bars of the pipe gallery bottom slab, tie up and connect the reserved reinforcement of the retaining piles on the top of the existing retaining piles with the steel bars of the bottom slab, install the waterproofing and chute embedded parts at the deformation joints of the bottom slab, and then pour the concrete of the pipe gallery bottom slab;

[0015] S4. Tie up the steel bars of the side walls and top slab of the pipe gallery and erect the lightweight formwork system:

[0016] After the reinforcement of the side wall of the pipe gallery is tied, a customized formwork trolley is used for formwork operation in the long straight section of the pipe gallery, and a lightweight formwork is used for formwork operation in the special curved section. After the formwork is installed, the reinforcement of the top plate of the pipe gallery is tied, and the construction joints of the side wall and top plate of the pipe gallery are waterproofed with steel plate waterstops;

[0017] S5. Concrete pouring of pipe gallery side walls and top slab:

[0018] After the steel bars, formwork and waterproofing system of the side walls and top slab of the pipe gallery have been accepted, the concrete of the side walls and top slab of the pipe gallery will be poured, and demoulding will be carried out after the curing is completed;

[0019] S6. Construction of waterproof system for pipe gallery side walls and top plate:

[0020] After the side wall of the tunnel is painted with waterproof paint, double-layer foam boards are installed. After the top plate of the tunnel is painted with waterproof paint, waterproof membranes are laid. The waterproof membranes are covered with bentonite waterproof blankets to form the top waterproof layer, and the top fine stone concrete protective layer is poured on the surface.

[0021] S7. Layered backfilling of fluidized solidified soil in the fertilizer trough of the pipe gallery:

[0022] A winch is installed on the roof of the tunnel, and the suspended operating platform is pulled to the bull leg of the retaining pile by the winch. The fertilizer trough of the tunnel is backfilled in layers by pumping fluidized solidified soil.

[0023] Furthermore, in step S1, prestressed anchor piles are symmetrically arranged on both sides of the foundation pit, obliquely pass through the inverted wall panels downward to the soil behind the retaining piles, and anchor ends are arranged at the ends inside the foundation pit.

[0024] Furthermore, in step S2, the inner diameter of the steel casing is larger than the diameter of the existing retaining piles, and the top of the steel casing is not lower than the bottom fine stone concrete protective layer.

[0025] Furthermore, in step S2, the chute embedded parts are used for installing equipment inside the corridor, and connecting nails are provided on the back to be welded and connected to the steel bars of the corridor side walls.

[0026] Furthermore, in step S3, an external rubber waterstop is arranged on the outside of the deformation joint of the tunnel floor, an embedded steel-edge rubber waterstop, shear reinforcement and steel casing of the shear reinforcement are arranged in the middle, low-foaming filling materials are arranged on both sides of the embedded steel-edge rubber waterstop, and a sealant caulking is arranged on the inside of the deformation joint.

[0027] Furthermore, in step S4, the customized mold frame trolley consists of a frame body, an assembled top mold and an assembled side mold. Adjustable supporting feet are arranged at equal longitudinal intervals in the middle of the bottom of the frame body, and walking tracks are symmetrically arranged on both sides of the bottom. Steel support members are arranged between the assembled top mold and the frame body. The assembled top mold and the assembled side mold are connected by hinged diagonal braces. Hydraulic support rods and limit rods are arranged between the assembled side mold and the frame body.

[0028] Furthermore, in step S4, the lightweight formwork is composed of adjustable cross braces, vertical braces, truss assemblies, steel side formworks and steel top formworks. The left and right truss assemblies are connected by adjustable cross braces, the vertical braces are arranged between the top formwork and the bottom plate of the pipe gallery, and a lifting pulley assembly is arranged at the bottom of the truss assembly.

[0029] Furthermore, in step S4, an external rubber waterstop is arranged on the outer side of the construction joint of the side wall of the tunnel, and an embedded steel-edge rubber waterstop, shear reinforcement and steel casing of the shear reinforcement are arranged in the middle, low-foaming caulking materials are arranged on both sides of the embedded steel-edge rubber waterstop, and sealant caulking is arranged on the inner side of the deformation joint.

[0030] Furthermore, in step S4, a buried steel-edge rubber waterstop is provided in the middle of the construction joint of the tunnel roof, low-foaming caulking materials are provided on both sides of the buried steel-edge rubber waterstop, and sealant caulking is provided on both the inner and outer sides.

[0031] Furthermore, in step S7, the suspended operating platform consists of an upper L-shaped bracket and a lower L-shaped platform. The L-shaped brackets on both sides of the corridor are connected and fixed by top pressure rods. Both the L-shaped bracket and the L-shaped platform are provided with limiting holes. The L-shaped bracket is provided with a slide groove. The top of the L-shaped platform is provided with a lifting ring, and the bottom is an articulated working platform.

[0032] The present invention has the following characteristics and beneficial effects:

[0033] 1) The present invention has developed a foundation pit prestressed anchor pile plate protection system. By setting upside-down wall panels on the retaining piles, and setting up prestressed anchor piles on the basis of the upside-down wall panels, and using steel supports on the top combination, the stability of the foundation pit slope is greatly improved, ensuring the safety of foundation pit construction.

[0034] 2) The present invention optimizes the formwork system of the cast-in-place pipe gallery. Customized formwork trolleys and lightweight formwork frames are used for formwork operations for straight sections and curved sections respectively, which solves the problem of low conversion efficiency of the cast-in-place pipe gallery formwork system while ensuring construction quality and reducing construction costs.

[0035] 3) The present invention has developed a highly efficient backfilling technology for fluidized solidified soil in the fertilizer trough of the pipe gallery. By setting up a hanging operation platform, high-quality pumping backfilling of fluidized solidified soil is achieved, solving the technical problems of the traditional filling method, such as the cumbersome construction process and unstable backfill soil compaction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the prestressed anchor pile plate protection system structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the structure of the cast-in-place pipe gallery passing through the existing line bottom plate of the present invention;

[0038] Figure 3 This is a schematic diagram of the waterproof structure of the deformation joint of the bottom plate of the pipe gallery of the present invention;

[0039] Figure 4 It is a schematic diagram of the waterproof structure of the expansion joint of the side wall of the pipe gallery of the present invention;

[0040] Figure 5 This is a schematic diagram of the waterproof structure of the deformation joint of the top plate of the pipe gallery of the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of the straight segment customized mold frame trolley of the present invention;

[0042] Figure 7 This is a schematic diagram of the curved segment lightweight mold frame structure of the present invention;

[0043] Figure 8 It is a schematic diagram of the structure of the embedded chute of the present invention;

[0044] Fig. 9It is a cross-sectional view of the waterproof system of the cast-in-place pipe gallery of the present invention;

[0045] Fig.10 It is a schematic diagram of layered backfilling of fluidized solidified soil in a fertilizer trough of the present invention.

[0046] In the figure: 1. Drainage ditch; 2. Steel support; 3. Cast-in-place pipe gallery; 4. Steel purlin; 5. Cured slope; 6. Crown beam; 7. Inverted wall panel; 8. Anchor end; 9. Prestressed anchor pile; 10. Retaining pile; 11. Pad; 12. Bottom waterproof layer; 13. Bottom fine stone concrete protective layer; 14. Retaining pile reserved reinforcement; 15. Steel casing; 16. Existing line retaining pile; 17. Steel support; 18. Assembled top formwork; 19. Articulated diagonal brace; 20. Limit rod; 21. Hydraulic support rod; 22. Assembled side formwork; 23. Pipe gallery bottom plate; 24. Frame body; 25. Walking track; 26. Adjustable support foot; 27. Steel top formwork; 28. Steel side formwork; 29. ​​Truss assembly; 30. Lifting pulley assembly; 31. Adjustable horizontal brace; 32. Vertical brace; 3 3. Shear reinforcement; 34. Sealant caulking; 35. Embedded steel-edge rubber waterstop; 36. Steel casing; 37. Construction joint; 38. External rubber waterstop; 39. Low-foaming caulking material; 40. Pipe gallery side wall; 41. Pipe gallery roof; 42. Top waterproof layer; 43. Top fine stone concrete protective layer; 44. Waterproof coating; 45. Double-layer foam board; 46. Steel plate waterstop; 47. Pipe gallery bottom plate steel bar; 48. Pipe gallery side wall steel bar; 49. Slide embedded parts; 50. Connecting nails; 51. Corbel; 52. Expansion bolts; 53. Working board; 54. Flowing solidified soil; 55. L-shaped bracket; 56. L-shaped platform; 57. Limiting hole; 58. Hinge shaft; 59. Connecting bolts; 60. Wire rope; 61. Pressure rod; 62. Winch; 63. Lifting ring. DETAILED DESCRIPTION

[0047] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0048] The cast-in-place pipe gallery construction method specifically includes the following steps:

[0049] S1. Excavation of foundation pit and construction of 9-plate protection system of prestressed anchor piles:

[0050] The foundation pit is excavated according to the measurement and layout results. After the foundation pit is excavated, inverted wall panels 7 are constructed on both sides, and prestressed anchor piles 9 are set on the basis of the inverted wall panels 7. At the same time, a steel support system is installed through the crown beam 6 on the top of the retaining piles 10. The steel support system consists of multiple steel supports 2.

[0051] In this step, if Figure 1 As shown, the prestressed anchor piles 9 are symmetrically arranged on both sides of the foundation pit, obliquely pass through the inverted wall plate 7 to the soil behind the retaining piles 10, and an anchor end 8 is arranged at the end inside the foundation pit. Figure 1 A solidified slope 5, a drainage ditch 1 and a steel purlin 4 are also provided.

[0052] S2. Construction of foundation pit cushion layer 11 and bottom plate waterproofing membrane:

[0053] After manually cleaning and leveling the bottom of the foundation pit, plain concrete is poured to level it as the cushion layer 11 of the pipe gallery structure, and waterproof membrane is laid on the cushion layer 11. The waterproof membrane is covered with bentonite waterproof blanket to form a bottom waterproof layer 12, and then fine stone concrete is poured as the bottom fine stone concrete protective layer 13;

[0054] Among them, when there are existing linear retaining piles 16 at the bottom of the foundation pit, the pile head part of the retaining pile 10 is chiseled out, the vertical steel bars are retained, and a steel casing 15 is constructed on the top of the existing linear retaining pile 16, and then a waterproof membrane is laid and a fine stone concrete protective layer is poured.

[0055] In this step, if Figure 2 As shown, the inner diameter of the steel casing 15 is larger than the pile diameter of the existing line retaining pile 16, and the top of the steel casing 15 is not lower than the bottom fine stone concrete protective layer 13.

[0056] S3, pipe gallery bottom plate steel bar 47, concrete construction and comprehensive waterproofing treatment of expansion joints:

[0057] Tie up the steel bars 47 of the gallery floor, and tie up the reserved reinforcement 14 of the existing retaining piles 16 on the top with the steel bars of the gallery floor 23. After the waterproofing and chute embedded parts 49 at the deformation joints of the gallery floor 23 are installed, pour the concrete of the gallery floor 23.

[0058] In this step, if Figure 8 As shown, the chute embedded part 49 is used for installing equipment inside the corridor, and a connecting nail 50 is provided on the back, which is welded to the corridor side wall steel bar 48.

[0059] like Figure 3 As shown, an external rubber waterstop 38 is arranged on the outside of the deformation joint of the tunnel floor 23, and an embedded steel-edge rubber waterstop 35, shear reinforcement 33 and a steel casing 36 of the shear reinforcement 33 are arranged in the middle, low-foaming filling materials 39 are arranged on both sides of the embedded steel-edge rubber waterstop 35, and a sealant caulking 34 is arranged on the inside of the deformation joint.

[0060] S4, pipe gallery side wall 40, top plate reinforcement binding and lightweight formwork system erection:

[0061] After the steel bars 48 of the corridor side wall are tied, a customized formwork trolley is used for formwork operations in the long straight section of the corridor, and a lightweight formwork is used for formwork operations in special curved sections. After the formwork is installed, the steel bars of the corridor top plate 41 are tied, and the construction joints 37 of the corridor side walls 40 and the corridor top plate 41 are waterproofed with steel plate waterstops 46.

[0062] In this step, if Figure 6 As shown, the customized mold frame trolley consists of a frame body 24, an assembled top mold 18 and an assembled side mold 22. Adjustable supporting feet 26 are arranged at equal longitudinal intervals in the middle of the bottom of the frame body 24, and walking tracks 25 are symmetrically arranged on both sides of the bottom. A steel support 17 is arranged between the assembled top mold 18 and the frame body 24. The assembled top mold 18 and the assembled side mold 22 are connected by an articulated diagonal brace 19. A hydraulic support rod 21 and a limit rod 20 are arranged between the assembled side mold 22 and the frame body 24.

[0063] like Figure 7 As shown, the lightweight formwork consists of an adjustable transverse brace 31, a vertical brace 32, a truss assembly 29, a steel side form 28 and a steel top form 27. The left and right truss assemblies 29 are connected by an adjustable transverse brace 31, the vertical brace 32 is arranged between the top form and the corridor bottom plate 23, and a lifting pulley assembly 30 is arranged at the bottom of the truss assembly 29.

[0064] like Figure 4 As shown, an external rubber waterstop 38 is arranged on the outside of the construction joint 37 of the side wall 40 of the tunnel, and an embedded steel-edge rubber waterstop 35, shear reinforcement 33 and a steel casing 36 of the shear reinforcement 33 are arranged in the middle, low-foaming caulking materials 39 are arranged on both sides of the embedded steel-edge rubber waterstop 35, and a sealant caulking 34 is arranged on the inside of the deformation joint.

[0065] like Figure 5 As shown, a buried steel-edge rubber waterstop 35 is arranged in the middle of the construction joint 37 of the pipe gallery top plate 41, low-foaming caulking materials 39 are arranged on both sides of the buried steel-edge rubber waterstop 35, and sealant caulking 34 is arranged on both the inner and outer sides.

[0066] S5. Concrete pouring of pipe gallery side wall 40 and top slab:

[0067] After the steel bars, formwork and waterproofing system of the side walls 40 and top slab of the corridor have been accepted, the concrete of the side walls 40 and top slab of the corridor will be poured, and demoulding will be carried out after the curing is completed.

[0068] S6. Construction of waterproof system for pipe gallery side wall 40 and top plate:

[0069] After the surface of the side wall 40 of the tunnel is painted with waterproof paint 44, a double-layer foam board 45 is installed, and the top plate 41 of the tunnel is painted with waterproof paint 44 and then a waterproof membrane is laid. The waterproof membrane is covered with a bentonite waterproof blanket to form a top waterproof layer 42, and a top fine stone concrete protective layer 43 is poured on the surface.

[0070] S7, pipeline gallery fertilizer trough fluidized solidified soil 54 layers backfill:

[0071] A winch 62 is installed on the top plate 41 of the pipe gallery, and the hanging operating platform is pulled to the bracket 51 of the retaining pile 10 by the winch 62. The pipe gallery fertilizer trough is backfilled in layers by pumping fluidized solidified soil 54 to complete the construction of the cast-in-place pipe gallery 3.

[0072] In this step, if Fig.10 As shown, the suspended operating platform consists of an upper L-shaped bracket 55 and a lower L-shaped platform 56. The L-shaped brackets 55 on both sides of the pipe gallery are connected and fixed by top pressure rods 61 and connecting bolts 59. Both the L-shaped brackets 55 and the L-shaped platform 56 are provided with limiting holes 57. The L-shaped bracket 55 is provided with a slide groove. The top of the L-shaped platform 56 is provided with a lifting ring 63. The bottom is an articulated working platform, and the articulated working platform and the L-shaped platform 56 are hinged by a hinge shaft 58.

[0073] The bracket 51 is fixed to the retaining pile 10 by an expansion bolt 52. An articulated working platform can be placed on the bracket 51, and a working board 53 is placed on the articulated working platform. The winch 62 is connected to the lifting ring 63 of the hanging operating platform by a wire rope 60.

[0074] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0075] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0076] Although this article uses more professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0077] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A cast-in-place pipe gallery construction method, characterized in that: The following steps are involved: S1. Excavation of foundation pit and construction of prestressed anchor pile (9) plate protection system: Excavation of the foundation pit is carried out according to the surveying and setting out results. After the excavation of the foundation pit, inverted wall panels (7) are constructed on both sides, and prestressed anchor piles (9) are arranged on the basis of the inverted wall panels (7). At the same time, a steel support system is installed through the crown beam (6) on the top of the retaining pile (10), and the steel support system is composed of a plurality of steel supports (2); S2. Construction of foundation pit cushion layer (11) and bottom plate waterproofing membrane: After manually cleaning and leveling the bottom of the foundation pit, plain concrete is poured to level it, which serves as a cushion layer (11) of the pipe gallery structure, and a waterproofing membrane is laid on the cushion layer (11). The waterproofing membrane is covered with a bentonite waterproof blanket to form a bottom waterproof layer (12), and then fine stone concrete is poured as a bottom fine stone concrete protective layer (13); Wherein, when there are existing retaining piles (16) at the bottom of the foundation pit, the pile head of the retaining pile (10) is chiseled off, the vertical steel bars are retained, and a steel casing (15) is applied on the top of the existing retaining pile (16), and then a waterproofing coil is laid and a fine stone concrete protective layer is poured; S3, pipe gallery bottom slab reinforcement (47), concrete construction and comprehensive waterproofing treatment of expansion joints: Tie up the pipe gallery bottom plate steel bars (47), tie up the reserved reinforcement bars (14) of the retaining piles on the top of the existing retaining piles (16) and connect them with the bottom plate steel bars, install the waterproof and chute embedded parts (49) at the bottom plate deformation joints, and then pour the concrete of the pipe gallery bottom plate (23); S4, Pipe gallery side wall (40), top plate reinforcement binding and lightweight formwork system erection: After the steel bars (48) of the pipe gallery side wall are tied, a customized formwork trolley is used for formwork operation in the long straight section of the pipe gallery, and a lightweight formwork is used for formwork operation in the special curved section. After the formwork is installed, the steel bars of the pipe gallery top plate (41) are tied, and the construction joints (37) of the pipe gallery side wall (40) and the top plate are waterproofed by a steel plate water stop (46); S5. Concrete pouring of pipe gallery side walls (40) and top slab: After the steel bars, formwork and waterproofing system of the pipe gallery side wall (40) and top plate are accepted, the concrete of the pipe gallery side wall (40) and top plate is poured, and demoulding is performed after curing is completed; S6. Construction of waterproof system for pipe gallery side wall (40) and top plate: After the surface of the pipe gallery side wall (40) is painted with waterproof coating (44), a double-layer foam board (45) is installed, and after the top plate (41) of the pipe gallery is painted with waterproof coating (44), a waterproof roll is laid, and the waterproof roll is covered with a bentonite waterproof blanket to form a top waterproof layer (42), and a top fine stone concrete protective layer (43) is poured on the surface. S7, backfilling the pipeline gallery fertilizer trough with fluidized solidified soil (54) in layers: A winch (62) is installed on the top plate (41) of the pipe gallery, and the hanging operation platform is towed to the bracket (51) of the retaining pile (10) by the winch (62), and the pipe gallery fertilizer trough is backfilled in layers by pumping fluidized solidified soil (54).

2. The cast-in-place pipe gallery construction method according to claim 1, characterized in that: In step S1, prestressed anchor piles (9) are symmetrically arranged on both sides of the foundation pit, obliquely pass through the inverted wall plate (7) downward to the soil behind the retaining piles (10), and an anchor end (8) is arranged at the end inside the foundation pit.

3. The cast-in-place pipe gallery construction method according to claim 1, characterized in that: In step S2, the inner diameter of the steel casing (15) is larger than the pile diameter of the existing line retaining pile (16), and the top of the steel casing (15) is not lower than the bottom fine stone concrete protective layer (13).

4. The cast-in-place pipe gallery construction method according to claim 1, characterized in that: In step S2, the chute embedded part (49) is used for installing equipment inside the pipe gallery, and a connecting nail (50) is provided on the back thereof, which is welded and connected to the steel bars (48) of the side wall of the pipe gallery.

5. The cast-in-place pipe gallery construction method according to claim 1, characterized in that: In step S3, an external rubber waterstop (38) is arranged on the outside of the deformation joint of the tunnel floor (23), an embedded steel-edge rubber waterstop (35), shear reinforcement (33) and a steel casing (36) of the shear reinforcement (33) are arranged in the middle, low-foaming caulking material (39) is arranged on both sides of the embedded steel-edge rubber waterstop (35), and a sealant caulking (34) is arranged on the inside of the deformation joint.

6. The cast-in-place pipe gallery construction method according to claim 1, characterized in that: In step S4, the customized mold frame trolley is composed of a frame body (24), an assembled top mold (18) and an assembled side mold (22), and adjustable support feet (26) are arranged at equal intervals in the middle of the bottom of the frame body (24) in the longitudinal direction, and walking tracks (25) are symmetrically arranged on both sides of the bottom. A steel support member (17) is arranged between the assembled top mold (18) and the frame body (24), and the assembled top mold (18) and the assembled side mold (22) are connected by an articulated diagonal brace (19), and a hydraulic support rod (21) and a limit rod (20) are arranged between the assembled side mold (22) and the frame body (24).

7. The cast-in-place pipe gallery construction method according to claim 1, characterized in that: In step S4, the lightweight formwork is composed of an adjustable transverse brace (31), a vertical brace (32), a truss assembly (29), a steel side form (28) and a steel top form (27), the left and right truss assemblies (29) are connected by an adjustable transverse brace (31), the vertical brace (32) is arranged between the top form and the corridor bottom plate (23), and a lifting pulley assembly (30) is arranged at the bottom of the truss assembly (29).

8. The cast-in-place pipe gallery construction method according to claim 1, characterized in that: In step S4, an external rubber waterstop (38) is arranged on the outside of the construction joint (37) of the side wall (40) of the tunnel, and an embedded steel-edge rubber waterstop (35), shear reinforcement (33) and a steel casing (36) of the shear reinforcement (33) are arranged in the middle, low-foaming caulking material (39) is arranged on both sides of the embedded steel-edge rubber waterstop (35), and a sealant caulking (34) is arranged on the inside of the deformation joint.

9. The cast-in-place pipe gallery construction method according to claim 1, characterized in that: In step S4, a buried steel-edge rubber waterstop (35) is arranged in the middle of the construction joint (37) of the tunnel roof (41), low-foaming caulking materials (39) are arranged on both sides of the buried steel-edge rubber waterstop (35), and sealant caulking (34) is arranged on both the inner and outer sides.

10. The cast-in-place pipe gallery construction method according to claim 1, characterized in that: In step S7, the hanging operation platform is composed of an upper L-shaped hanger (55) and a lower L-shaped platform (56). The L-shaped hangers (55) on both sides of the pipe gallery are connected and fixed by a top pressure rod (61). Both the L-shaped hanger (55) and the L-shaped platform (56) are provided with a limiting hole (57). The L-shaped hanger (55) is provided with a slide groove. The top of the L-shaped platform (56) is provided with a lifting ring (63), and the bottom is an articulated working platform.

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