CN115418983B - Construction method of prefabricated box culverts in large-section shield tunnels jointly built by highway and railway - Google Patents

Abstract

The invention relates to a method for constructing a prefabricated box culvert in a large-section shield tunnel jointly built by highways and railways, comprising the steps of: construction preparation; steel bar binding; mold assembly and mold entry; concrete pouring; demoulding construction; box culvert transportation; box culvert installation construction. The beneficial effects of the present invention are: the formwork construction is carried out through the adjustable formwork support bracket of the prefabricated steel pedestal, the safety and convenience of demoulding and mold closing are improved, and manpower is saved; the steel bar binding construction is carried out by adopting the shaped frame of the steel bar skeleton , the construction quality is good, the speed is fast, and it is easy to operate; the prefabricated box culvert concrete pouring device is used for concrete pouring construction, which has a high degree of mechanization and uniform pouring, which reduces personnel operations and saves costs; through the prefabricated box culvert transport fixing frame and prefabricated box culvert installation The device is transported and installed to ensure the safety of transportation, avoid damage, install and place accurately, facilitate personnel to operate, and ensure construction quality.

Description

Construction method of prefabricated box culverts in large-section shield tunnels jointly built by highway and railway

technical field

The invention belongs to the field of tunnel engineering, and includes a method for constructing a prefabricated box culvert in a large-section shield tunnel jointly built by highways and railways, and is especially suitable for the construction of a π-shaped prefabricated box culvert with a large section.

Background technique

Prefabricated box culverts are prefabricated in special prefabricated yards, and then transported from the prefabricated site to the construction site for on-site installation and platform backfilling. Prefabricated box culverts have very broad prospects and are worthy of large-scale promotion. Although prefabricated box culverts are widely used at present, the prefabrication of box culverts in large-section shield tunnels jointly built by highways and railways is relatively rare, and the steel bar binding, formwork assembly, transportation and installation of prefabricated box culverts are often affected. The construction efficiency and the construction quality of the prefabricated box culverts in the large-section shield tunnels jointly built by highways and railways cannot be guaranteed.

In view of this, in view of the deficiencies in the construction of prefabricated box culverts in the past, a new construction method for prefabricated box culverts in large-section shield tunnels jointly built by highways and railways is urgently needed to improve construction efficiency, improve construction quality, and ensure safe and reliable construction quality.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a prefabricated box culvert and a construction method in a large-section shield tunnel built together with highways and railways.

This kind of prefabricated box culvert in a large-section shield tunnel built jointly by highways and railways includes: prefabricated steel pedestal, steel frame shaped tire frame, box culvert concrete pouring device, box culvert transport fixing frame and box culvert installation device;

The prefabricated section steel pedestal includes section steel, jacks, outer formwork, inner formwork and section steel frame; section steel forms a rectangle on the ground, and jacks are provided at both ends of the longitudinal section steel; Located in the center of the section steel, a hydraulic jacking device is installed between the inner formwork and the section steel frame; a closed maintenance shed is provided around the prefabricated section steel pedestal;

The bottom of the steel frame shaped tire frame is a steel backing plate. There are several vertical steel frames on the steel backing plate. There are several horizontal steel pipes on the vertical steel frame. The gaps between the horizontal steel pipes are holes reserved for box culverts. There is a telescopic inner tire frame in the reserved hole;

There are slide rails on both sides of the box culvert, and there is a cross bar with a chute between the slide rails, and the cross bar with a chute slidably connects the material box to form a box culvert concrete pouring device;

The box culvert transport fixing frame includes a jacking beam, a box-shaped frame and a telescopic jacking rod. push rod hole;

A track is provided at the bottom of the box culvert installation device, and the track is slidably connected to an arc-shaped bottom bracket. A supporting end plate is arranged on the arc-shaped bottom bracket, and an operating platform is arranged on the supporting end plate.

As a preference: the hydraulic jacking device includes a U-shaped plate with holes, an ear plate, a bolt, a threaded push rod and a threaded sleeve, the ear plate is fixed on the inner template, and the U-shaped plate with holes is fixed by bolts On the lug plate, one end of the threaded push rod is fixed on the U-shaped plate with a hole, and the other end is rotatably fixed on the threaded sleeve; the other side of the threaded sleeve passes through the U-shaped plate, lug plate, bolt and thread The push rod is connected to the steel frame.

As a preference: the steel backing plate is arranged on the ground, and the vertical steel frames in the center of the two columns at both ends of the steel backing plate are connected with the steel backing plate through fixing grooves; the vertical steel frames in the center of the four sides of the steel backing plate and Diagonal supports are also provided between the steel backing plates.

As a preference: the telescopic inner support tire frame includes a rectangular hoop, a wooden board, a telescopic vertical brace and a telescopic horizontal brace, and the wooden board is supported at the reserved hole by the telescopic vertical brace and the telescopic horizontal brace, and passed through Rectangular hoop to fix.

As a preference: the closed maintenance shed includes a fixed base plate, an embedding groove, a color steel tile, a shaped steel bracket, a shaped steel horizontal frame and a movable rolling door, the fixed base plate is provided with an embedded groove, the bottom of the shaped steel bracket is connected to the embedded groove, and the shaped steel horizontal frame connects two The profiled steel bracket on the side, the top surface of the profiled steel horizontal frame and the side of the profiled steel bracket are provided with color steel tiles; the closed maintenance shed is equipped with movable rolling doors on both ends of the fixed bottom plate.

As a preference: in the box culvert concrete pouring device, the slide rails on both sides of the box culvert are rolled and connected to the rollers, the rollers are connected to the support rods, the bottom ends of the support rods on both sides are connected by cross bars with chute, the bottom chute with cross bar The roller is connected inside, the steel pipe is connected to the bottom of the roller through the suspender, and the steel pipe is connected to the material box through the ear plate with holes.

As a preference: in the box culvert installation device, the track is set on the track backing plate, the track backing plate is set on the ground, and the arc-shaped bottom bracket is connected to the track through the sliding fixing piece and the sliding member; there is a connection between the supporting end plate and the operating platform. Steel Pipe.

The construction method of the prefabricated box culvert in the large-section shield tunnel jointly built by highway and railway comprises the following steps:

Step 1. Construction preparation: on-site traffic control, site cleaning, inspection and acceptance of materials;

Step 2. Binding of steel bars: Assemble the steel bar frame and shape the tire frame, and then bind the steel bars on the telescopic inner support frame after assembly to form a steel bar cage;

Step 3. Mold assembly and mold entry: Assemble the prefabricated steel pedestal, install the protective blocks on the reinforcement cage, lift the bundled reinforcement cage into the mold and tighten it;

Step 4. Concrete pouring: Assemble the mobile special pouring material box, move the material box with rollers and cross bars with chutes, and perform concrete pouring of the box culvert; after the concrete pouring is completed, install a closed curing shed for closed maintenance of the box culvert;

Step 5, demoulding construction: dismantle all the connectors on the inner formwork and outer formwork, and use the hydraulic jacking device to separate the inner formwork and outer formwork;

Step 6. Box culvert transportation: Assemble the box culvert transport fixing frame, the telescopic push rod pushes and fixes the box culvert through the push rod hole, puts the box culvert into the box culvert transport fixing frame and transports;

Step 7. Box culvert installation and construction: Assemble the track-movable arc-shaped bottom support with an auxiliary landing construction platform with an operating platform. After the box culvert is transported to the site, hang it on the support end plate, and move it to the designated landing position for hoisting Release and install, complete the installation and construction; check and accept, dismantle and leave the equipment and machinery.

Preferably, in step six: when transporting the box culvert, place the box culvert in a box-shaped frame, and push the box culvert to fix it by pushing the telescopic push rod through the push rod hole on the push beam.

The beneficial effects of the present invention are:

1) The formwork construction is carried out through the adjustable formwork support bracket of the prefabricated steel pedestal, which improves the safety and convenience of demoulding and mold closing, and saves manpower.

2) The steel bar binding construction is carried out by adopting the steel frame shaped tire frame, which has good construction quality, fast speed and easy operation.

3) Prefabricated box culvert concrete pouring device is used for concrete pouring construction, which has a high degree of mechanization and uniform pouring, which reduces personnel operations and saves costs.

4) The transportation and installation are carried out through the prefabricated box culvert transport fixing frame and the prefabricated box culvert installation device, which ensures the safety of transportation, avoids damage, accurate installation and positioning, is convenient for personnel to operate, and the construction quality is guaranteed.

Description of drawings

Fig. 1 is the structural representation of prefabricated steel pedestal of the present invention;

Fig. 2 is a schematic diagram of the structure of the adjustable formwork support bracket of the present invention;

Fig. 3 is a schematic diagram of the structure of the closed curing shed of the present invention;

Fig. 4 is the front view of the stereotyped tire frame structure of the reinforced skeleton of the present invention;

Fig. 5 is A-A sectional view among Fig. 4;

Fig. 6 is a structural schematic diagram of the telescopic inner support tire frame on the shaped tire frame of the reinforced skeleton of the present invention;

Fig. 7 is the front view of the structure of the mobile special pouring material box;

Fig. 8 is a side view of the structure of the mobile special pouring material box;

Fig. 9 is a front view of the prefabricated box culvert transport fixture structure;

Figure 10 is a side view of the prefabricated box culvert transport fixture structure;

Fig. 11 is a front view of the structure of the auxiliary landing construction platform of the track-movable arc-shaped bottom support belt operating platform;

Fig. 12 is a side view of the structure of the auxiliary landing construction platform of the track-movable arc-shaped bottom support belt operating platform.

In the figure: 1-shaped steel, 2-jack, 3-fixed bottom plate, 4-embedded groove, 6-lifting top plate, 7-outer formwork, 8-inner formwork, 9-hydraulic jacking device, 10-shaped steel frame, 11- Color steel tile, 12-threaded push rod, 13-threaded casing, 14-ear plate, 15-bolt, 16-U-shaped plate with holes, 17-shaped steel horizontal frame, 18-shaped steel bracket, 19-movable rolling door , 20-template, 21-reserved hole, 22-horizontal steel pipe, 23-vertical steel frame, 24-rectangular hoop, 25-fixing groove, 26-slanting support, 27-steel backing plate, 28-extensible Vertical support, 29-retractable horizontal brace, 30-box culvert, 31-crossbar with chute, 32-steel pipe, 33-ear plate with hole, 34-material box, 35-support rod, 36-roller, 37- Slide rail, 38-roller, 39-hanger, 40-jack beam, 41-box frame, 42-jack hole, 43-telescopic jack, 44-steel chassis, 45-sliding fixation Components, 46-arc bottom bracket, 47-support end plate, 48-operating platform, 49-connecting steel pipe, 50-sliding member, 51-track, 52-track backing plate.

Detailed ways

The present invention will be further described below in conjunction with the examples. The description of the following examples is provided only to aid the understanding of the present invention. It should be pointed out that for those skilled in the art, some modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Embodiment one

As an example, a prefabricated box culvert in a large-section shield tunnel built together with highways and railways as shown in Figures 1 to 12 includes a prefabricated steel pedestal, a shaped tire frame for a reinforced skeleton, and a prefabricated box culvert concrete pouring device, Prefabricated box culvert transport fixing frame, prefabricated box culvert installation device.

As shown in Figure 1: the prefabricated section steel pedestal includes section steel 1, jack 2, lifting roof 6, outer formwork 7, inner formwork 8, hydraulic jacking device 9, section steel frame 10 and closed maintenance shed, and the section steel 1 is placed It forms a rectangle on the ground, and four jacks 2 are placed in parallel at both ends of the longitudinal section steel 1, the lifting top plate 6 is fixed on the jack 2, the outer formwork 7 and the inner formwork 8 are fixed on the section steel 1, and the section steel frame 10 is fixedly placed in the middle of the profile steel 1, one end of the hydraulic jacking device 9 is fixed on the inner template 8, and the other end is fixed on the profile steel frame 10;

As shown in Figure 2: the hydraulic jacking device includes a U-shaped plate with holes 16, an ear plate 14, a bolt 15, a threaded push rod 12, and a threaded sleeve 13, and the ear plate 14 is fixed on the inner template 8, The U-shaped plate with holes 16 is fixed on the ear plate 14 by bolts 15 , one end of the threaded push rod 12 is fixed on the U-shaped plate with holes 16 , and the other end is rotatably fixed on the threaded sleeve 13 .

As shown in Figures 1 and 3: the closed maintenance shed includes a fixed base plate 3, an embedded groove 4, a color steel tile 11, a steel bracket 18, a steel horizontal frame 17 and a mobile rolling door 19, and the steel bracket 18 is placed on Embedded in the groove 4 and clamped and fixed by the fixed bottom plate 3, the profiled steel horizontal frame 17 is fixed on the profiled steel bracket 18, the color steel tile 11 is laid and fixed on the top surface of the profiled steel horizontal frame 17 and the side of the profiled steel bracket 18, and the moving roll Door 19 is fixed on the maintenance shed both sides.

As shown in Figure 4: it also includes the shaped tire frame of the steel bar skeleton, and the shaped tire frame of the steel bar skeleton includes a fixed groove 25, an oblique support 26, a rectangular hoop 24, a plank 20, a reserved hole 21, a horizontal steel pipe 22, a vertical Directional steel frame 22, telescopic vertical brace 25, steel backing plate 27 and telescopic cross brace 29, the steel backing plate 27 is placed and fixed on the ground, and the fixing groove 25 is arranged on the horizontal steel backing plate 27, with telescopic The vertical steel frame 23 of the inner support frame is fixed in the fixing groove 25, and the remaining vertical steel frames 23 are fixed on the steel backing plate 27, and the horizontal steel pipes 22 are fixed on the vertical steel frame 23 at a certain interval vertically. Above, one end of the diagonal support 26 is fixed to the vertical steel frame 23, and the other end is fixed to the ground. The telescopic inner support frame is set at the position of the reserved hole 21 of the box culvert.

As shown in Figure 5: the telescopic inner support tire frame includes a rectangular hoop 24, a wooden board 20, a telescopic vertical brace 28 and a telescopic horizontal brace 29, and the wooden board 20 passes through the telescopic vertical brace 28 and the telescopic horizontal brace. 29 is supported at the reserved hole 21 and fixed by a rectangular hoop 24.

As shown in Figures 7 and 8: it also includes a box culvert concrete pouring device, and the prefabricated box culvert concrete pouring technology includes slide rails 37, rollers 36, support rods 35, cross bars with chutes 31, steel pipes 32, and holes. Plate 33, material box 34, roller 38 and suspender 39, described slide rail 37 is arranged on box culvert 30 both sides, described roller 36 is fixed on support bar 35 bottoms, and described cross bar 31 with chute is fixed on two sides. On a support rod 35, the roller 38 is arranged on the cross bar 31 with a chute, the steel pipe 32 is fixed on the roller 38 through a suspender, and the material box 34 is fixed with the steel pipe 32 through the ear plate 33 with holes. On boom 39.

As shown in Figure 9 and Figure 10: it also includes a box culvert transport fixture, the prefabricated box culvert transport fixture includes a push beam 40, a box frame 41, a push rod hole 42, a telescopic push rod 43 and a shaped steel bottom frame 44, the bottom of the box-shaped frame 41 is provided with a shaped steel underframe 44, the push beam 40 is fixed on the box-shaped frame 41, the push rod hole 42 is arranged on the push beam 40, and the telescopic push beam The rod 43 pushes and fixes the box culvert 30 through the push rod hole 42 .

As shown in Figure 11 and Figure 12: it also includes prefabricated box culvert installation, the prefabricated box culvert installation technology includes track backing plate 52, track 51, sliding member 50, sliding fixing part 45, arc bottom support 46, Support the end plate 47, the operating platform 48 and the connecting steel pipe 49, the track backing plate 52 rests on the ground, the track 51 is fixed on the track backing plate 52, and the sliding member 50 is fixed on the arc through the sliding fixing piece 45. On the shaped bottom bracket 46, the support end plate 47 is installed on the arc bottom bracket 46, and the connecting steel pipe 49 is fixed on the bottom end of the operating platform 48, and is fixed on the support end plate 47.

Embodiment two

As another embodiment, the construction method of the prefabricated box culvert in the large-section shield tunnel of the road-rail joint construction proposed in the first embodiment includes the following steps:

Step 1, construction preparation: Do a good job of on-site traffic control, keep the site clean and tidy, and inspect and accept the construction materials entering the site.

Step 2, steel bar binding: first assemble the steel bar frame and shape the tire frame, put the steel backing plate 27 on the ground and fix it on the ground, the fixing groove 25 is set on the horizontal steel backing plate 27, and the vertical steel frame with the telescopic inner support tire frame 23 is fixed in the fixing groove 25, and the remaining vertical steel frames 23 are fixed on the steel backing plate 27, the horizontal steel pipes 22 are fixed on the vertical steel frame 23 at a certain interval vertically, and one end of the inclined support 26 is fixed on the The vertical steel frame 23, the other end is supported and fixed on the ground, the telescopic inner support tire frame is set at the position of the reserved hole 21 of the box culvert, and the wooden board 20 is supported in the reserved hole 21 through the telescopic vertical brace 28 and the telescopic horizontal brace 29 place, and fixed by the rectangular hoop 24, after the assembly is completed, construction processes such as steel bar bending and straightening machine welding are carried out on the tire frame.

Step 3, mold assembly: the section steel 1 is placed on the ground to form a rectangle, four jacks 2 are placed in parallel at both ends of the longitudinal section steel 1, the lifting top plate 6 is fixed on the jack 2, the outer formwork 7 and the inner formwork 8 are fixed on the section steel 1, and the section steel The frame 10 is fixedly placed in the middle of the section steel 1, one end of the hydraulic jacking device 9 is fixed on the inner formwork 8, and the other end is fixed on the section steel frame 10, the hydraulic jacking device is assembled, and the ear plate 14 is fixed on the inner formwork 8 with holes The U-shaped plate 16 is fixed on the lug plate 14 by bolts 15, one end of the threaded push rod 12 is fixed on the U-shaped plate 16 with holes, and the other end is rotated and fixed on the threaded sleeve 13, and the bound steel cage is hoisted into the in the mold.

Step 4: Reinforcing the cage into the mold: After installing the special plastic protection block on the specified position on the reinforcing cage, the reinforcing cage is hoisted into the mold by the crane and the special lifting tool according to the specifications and tightened.

Step 5, pouring concrete: Assemble the mobile special pouring material box, the slide rails 37 are arranged on both sides of the box culvert 30, the rollers 36 are fixed on the bottom of the support rod 35, the cross bar 31 with a chute is fixed on the two support rods 35, roll The shaft 38 is arranged on the cross bar 31 with a chute, the steel pipe 32 is fixed on the roller 38 through the suspender, the material box 34 is fixed on the suspender 39 by the steel pipe 32 through the ear plate 33 with holes, and the box is moved forward, backward, left, and right. Concreting of culvert 30.

Step 6, maintenance: installation of a closed maintenance shed, placing the profiled steel bracket 18 in the embedded groove 4 and clamping and fixing it through the fixed bottom plate 3, the profiled steel horizontal frame 17 is fixed on the profiled steel bracket 18, and the color steel tile 11 is laid and fixed on the profiled steel horizontal frame 17 The top surface and the side of the shaped steel support 18, and the movable rolling door 19 are fixed on both sides of the curing shed, and the box culvert is closed and maintained after the concrete pouring is completed.

Step 7, demoulding construction: disassemble all the connecting bolts, lead screws, pull rods, etc. of the inner formwork 8 and the outer formwork 9, and use the hydraulic system to separate the inner and outer molds, and the sequence is opposite to the mold closing sequence.

Step 8, box culvert transportation: Assemble the box culvert transport fixing frame, set the steel underframe 44 at the bottom of the box frame 41, fix the push beam 40 on the box frame 41, and set the push rod hole 42 on the push beam 40, The telescopic push rod 43 pushes and fixes the box culvert 30 through the push rod hole 42, and the box culvert 30 is put into the prefabricated box culvert transport fixing frame for transportation.

Step 9, installation and construction of prefabricated box culverts: first assemble the auxiliary construction platform with movable arc-shaped bottom support and operating platform, the track backing plate 52 rests on the ground, the track 51 is fixed on the track backing plate 52, and the sliding member 50 The sliding fixture 45 is fixed on the arc bottom bracket 46, the support end plate 47 is installed on the arc bottom bracket 46, the connecting steel pipe 49 is fixed on the bottom end of the operation platform 48, and is fixed on the support end plate 47, the box culvert 30 After being transported to the site, hang it on the supporting end plate, and move to the designated position for hanging installation.

Step 10: After the construction is completed and inspected and accepted, the equipment and machinery are dismantled and exited.

Claims (9)

1. Prefabricated box culvert in big section shield tunnel is built together to public iron, its characterized in that includes: prefabricated steel pedestal, steel reinforcement framework shaping jig frame, box culvert concrete pouring device, box culvert transportation fixing frame and box culvert mounting device;

the prefabricated section steel pedestal comprises section steel (1), a jack (2), an outer template (7), an inner template (8) and a section steel frame (10); the section steel (1) surrounds a rectangle on the ground, two ends of the longitudinal section steel (1) are provided with jacks (2), the jacks (2) are connected with a lifting top plate (6), the section steel (1) is connected with an outer die plate (7) and an inner die plate (8), a section steel frame (10) is arranged in the center of the section steel (1), and a hydraulic jacking device (9) is arranged between the inner die plate (8) and the section steel frame (10); the periphery of the prefabricated steel pedestal is provided with a closed curing shed;

the bottom of the steel reinforcement framework shaping jig frame is provided with a steel base plate (27), a plurality of vertical steel frames (23) are arranged on the steel base plate (27), a plurality of transverse steel pipes (22) are arranged on the vertical steel frames (23), gaps among the transverse steel pipes (22) are reserved holes (21) for box culverts, and telescopic inner supporting jig frames are arranged in the reserved holes (21);

slide rails (37) are arranged on two sides of the box culvert (30), a cross bar (31) with a slide groove is arranged between the slide rails (37), and the cross bar (31) with the slide groove is connected with a feed box (34) in a sliding manner to form a box culvert concrete pouring device;

the box culvert transportation fixing frame comprises a pushing beam (40), a box frame (41) and a telescopic pushing rod (43), wherein a profile steel underframe (44) is arranged at the bottom of the box frame (41), the pushing beam (40) is fixed on the box frame (41), and the telescopic pushing rod (43) passes through a pushing rod hole (42) on the pushing beam (40);

the bottom of the box culvert installation device is provided with a track (51), the track (51) is connected with an arc-shaped bottom bracket (46) in a sliding mode, a supporting end plate (47) is arranged on the arc-shaped bottom bracket (46), and an operation platform (48) is arranged on the supporting end plate (47).

2. The prefabricated box culvert in the common-rail co-construction large-section shield tunnel according to claim 1, wherein the prefabricated box culvert is characterized in that: the hydraulic jacking device comprises a U-shaped plate (16) with holes, an ear plate (14), a bolt (15), a threaded jacking rod (12) and a threaded sleeve (13), wherein the ear plate (14) is fixed on the inner die plate (8), the U-shaped plate (16) with holes is fixed on the ear plate (14) through the bolt (15), one end of the threaded jacking rod (12) is fixed on the U-shaped plate (16) with holes, and the other end of the threaded jacking rod is rotationally fixed on the threaded sleeve (13); the other side of the threaded sleeve (13) is symmetrically connected with the profile steel frame (10) through a U-shaped plate (16), an ear plate (14), a bolt (15) and a threaded push rod (12).

3. The prefabricated box culvert in the common-rail co-construction large-section shield tunnel according to claim 1, wherein the prefabricated box culvert is characterized in that: the steel backing plates (27) are arranged on the ground, and two rows of vertical steel frames (23) in the center of the two transverse ends of the steel backing plates (27) are connected with the steel backing plates (27) through fixing grooves (25); and an inclined support (26) is arranged between the vertical steel frame (23) arranged in the four sides of the steel backing plate (27) and the steel backing plate (27).

4. The prefabricated box culvert in the common-rail co-construction large-section shield tunnel according to claim 1, wherein the prefabricated box culvert is characterized in that: the telescopic internal stay bed-jig comprises a rectangular hoop (24), a wood board (20), a telescopic vertical stay (28) and a telescopic transverse stay (29), wherein the wood board (20) is supported at a reserved hole (21) through the telescopic vertical stay (28) and the telescopic transverse stay (29) and is fixed through the rectangular hoop (24).

5. The prefabricated box culvert in the common-rail co-construction large-section shield tunnel according to claim 1, wherein the prefabricated box culvert is characterized in that: the closed curing shed comprises a fixed bottom plate (3), an embedded groove (4), color steel tiles (11), a section steel bracket (18), a section steel transverse frame (17) and a movable rolling door (19), wherein the embedded groove (4) is arranged on the fixed bottom plate (3), the embedded groove (4) is connected to the bottom of the section steel bracket (18), the section steel transverse frame (17) is connected with the section steel brackets (18) on two sides, and the color steel tiles (11) are arranged on the top surface of the section steel transverse frame (17) and the side surfaces of the section steel brackets (18); the two end surfaces of the fixed bottom plate (3) of the closed curing shed are provided with movable rolling doors (19).

6. The prefabricated box culvert in the common-rail co-construction large-section shield tunnel according to claim 1, wherein the prefabricated box culvert is characterized in that: in the box culvert concrete pouring device, rolling connection gyro wheels (36) in slide rail (37) of box culvert (30) both sides, gyro wheels (36) joint support pole (35), and take spout horizontal pole (31) to connect in the bottom spout of taking spout horizontal pole (31) to connect roller (38), and steel pipe (32) are passed through jib (39) below roller (38), and workbin (34) are connected through foraminiferous otic placode (33) to steel pipe (32).

7. The prefabricated box culvert in the common-rail co-construction large-section shield tunnel according to claim 1, wherein the prefabricated box culvert is characterized in that: in the box culvert installation device, a track (51) is arranged on a track base plate (52), the track base plate (52) is arranged on the ground, and an arc-shaped bottom bracket (46) is connected with the track (51) through a sliding fixing piece (45) and a sliding component (50); a connecting steel pipe (49) is arranged between the supporting end plate (47) and the operating platform (48).

8. The construction method of the prefabricated box culvert in the common-rail co-construction large-section shield tunnel according to claim 1, which is characterized by comprising the following steps:

step one, construction preparation: on-site traffic control, cleaning the site, and checking acceptance materials;

step two, binding reinforcing steel bars: assembling a reinforcement cage shaping jig frame, and binding reinforcement on the telescopic inner support jig frame after the reinforcement cage shaping jig frame is assembled to form a reinforcement cage;

step three, assembling a die and entering the die: after the prefabricated steel bar pedestal is assembled, the steel bar cage is hung into a die and tightly supported after the protection clamping block is arranged on the steel bar cage;

pouring concrete: assembling a movable special pouring feed box, and pouring concrete of the box culvert (30) by moving the feed box (34) through the roller (36) and the cross rod (31) with the sliding groove; installing a closed curing shed after concrete pouring is completed, and performing closed curing on the box culvert (30);

step five, demolding construction: all connecting pieces on the inner template (8) and the outer template (7) are disassembled, and the inner template (8) and the outer template (7) are separated by utilizing a hydraulic jacking device (9);

step six, box culvert transportation: assembling a box culvert transportation fixing frame, pushing and fixing the box culvert (30) by a telescopic pushing rod (43) through a pushing rod hole (42), and placing the box culvert (30) into the box culvert transportation fixing frame for transportation;

step seven, box culvert installation construction: the auxiliary landing construction platform of the movable arc-shaped bottom support belt operation platform of the assembly track is hung on a supporting end plate (47) after a box culvert (30) is transported to the site, and is hung and installed after the box culvert is moved to a designated landing position, so that installation construction is completed; check acceptance, equipment and mechanical removal of the refund.

9. The construction method of the prefabricated box culvert in the common-rail co-construction large-section shield tunnel according to claim 8, wherein in the step six: when transporting the box culvert (30), the box culvert (30) is placed in the box frame (41), and the telescopic pushing rod (43) penetrates through the pushing rod hole (42) on the pushing beam (40) to push the box culvert (30) to fix the box culvert.