A construction system and method for pouring concrete in confined spaces in bridges.

Abstract

This application relates to the technical field of bridge construction, and discloses a construction system and method for pouring concrete in confined spaces in bridges. The construction system for pouring concrete in confined spaces in bridges includes a main support frame, which is erected longitudinally and connected between the support foundation and the poured beam; a pump pipe assembly, including a longitudinal pump pipe and a transverse pump pipe; the longitudinal pump pipe is connected between a pumping device and the transverse pump pipe, and extends within the main support frame; the transverse pump pipe is arranged along the poured beam; and a support device is installed between the main support frame and the longitudinal pump pipe to support the longitudinal pump pipe, and multiple sets of the support device are spaced apart along the height direction of the main support frame.

Description

Technical Field

[0001] This application relates to the technical field of bridge construction, and in particular to a construction system and method for pouring concrete in confined spaces in bridges. Background Technology

[0002] Currently, in the construction of multiple parallel bridges and large-span cantilever cast-in-place beams, the bridge spacing is small and the working space is narrow. The commonly used concrete pump pouring operation requires a large area for outrigger deployment, boom rotation and deployment, etc., which is not easy to set up and operate normally in narrow and confined areas. As a result, the concrete delivery is difficult to carry out smoothly and cannot meet the actual needs of such complex construction sites. Summary of the Invention

[0003] This application provides a construction system and construction method for pouring concrete in confined spaces in bridges.

[0004] Firstly, this application provides a construction system for pouring concrete in confined spaces in bridges, employing the following technical solution: A construction system for pouring concrete in confined spaces in bridges, comprising: The main support frame is erected longitudinally and connected between the supporting foundation and the already poured beam. The pump pipe assembly includes a longitudinal pump pipe and a transverse pump pipe; the longitudinal pump pipe connects the pumping device and the transverse pump pipe, and extends within the main support frame; the transverse pump pipe is arranged along the cast-in-place beam; and The support device is installed between the main support frame and the longitudinal pump pipe to support the longitudinal pump pipe, and multiple sets of the support device are spaced apart along the height direction of the main support frame.

[0005] By adopting the above technical solution, the main support frame erected longitudinally between the supporting foundation and the cast-in-place beam provides a vertical extension channel for the longitudinal pump pipe, independent of the confined construction space, and utilizes the cast-in-place beam to support the transverse pump pipe. Multiple sets of support devices spaced at intervals along the height of the main support frame provide multi-point, uniform radial support for the longitudinal pump pipe, improving its stability during high-pressure, high-flow-rate concrete delivery and preventing displacement due to vibration and impact. This provides a reliable guarantee for the continuous and efficient casting of large-span structures such as cantilever cast-in-place beams.

[0006] Optionally, each set of support devices includes a first abutment and a second abutment; the first abutment has two parallel sides, and the second abutment has two parallel sides, and the two first abutments and the second abutment are arranged in a cross pattern and together clamp the longitudinal pump pipe circumferentially.

[0007] By adopting the above technical solution, and by setting two parallel first abutments and two parallel second abutments, and arranging them in a crisscross pattern to surround and clamp the longitudinal pump pipe, a "well"-shaped constraint is formed on the circumference of the pump pipe. This structure can provide radial clamping force to the pump pipe from four orthogonal directions simultaneously, effectively resisting the lateral forces, pulsating impacts, and longitudinal displacement tendencies generated during concrete pumping.

[0008] Optionally, each set of support devices also includes an outer frame, which is installed in the main support frame. The first abutment and the second abutment slide vertically and vertically in the outer frame, and the sliding direction of the first abutment is perpendicular to the sliding direction of the second abutment. The support device at the top is the main support unit, and the remaining support devices form the secondary support unit; the first and second abutments in the main support unit are locked by threaded adjustment, and the first and second abutments in the secondary support unit are locked by a linkage device. The linkage device has four sets, and the four sets of linkage devices cooperate with the two first abutments and the two second abutments of each set of support units to adjust and move the two first abutments and the two second abutments toward the longitudinal pump pipe.

[0009] By adopting the above technical solution, the topmost main support unit is set as an independently adjustable threaded locking structure, which can serve as the reference point for the entire system, enabling precise control of the upper position of the pump pipe. The remaining auxiliary support units are adjusted synchronously through a linkage device. With just one operation, the first or second abutment of all auxiliary support units can be moved simultaneously towards the pump pipe to press against it, greatly simplifying the installation and adjustment process of multiple support devices. Moreover, the operating position is close to the ground, improving operational safety.

[0010] Optionally, each linkage device includes a pull rope and a winding assembly; one end of the pull rope is fixed to the first or second abutment of the main support unit, and the pull rope simultaneously slides through the first or second abutment of each auxiliary support unit in sequence, so that the pull rope extends downward along a tortuous reciprocating path until it is wound onto the winding assembly, and the winding assembly is installed on the support foundation.

[0011] By adopting the above technical solution, a pull rope is sequentially threaded through the same type of abutment rods of all auxiliary support units in a zigzag pattern, and finally connected to the corresponding abutment rod of the main support unit. When the winding assembly winds up the pull rope, the component force generated by the pull rope at each bend can synchronously drive the abutment rods of all auxiliary support units in the same direction to slide towards the center of the pump pipe. This transforms the winding action into multi-point synchronous movement, realizing the linkage control of multiple sets and multiple abutment rods, and can adapt to changes in the size of the pump pipe.

[0012] Optionally, the winding assembly includes a base, a winding component, and a drive component; the base is fixedly installed to the supporting foundation, the winding component is rotatably connected to the base and winds up and unwinds the pull rope by rotating, and the drive component cooperates with the winding component to drive the winding component to rotate.

[0013] Optionally, the driving component includes a mating seat, a ratchet, a pawl, and an elastic element; the mating seat is mounted on the base, the winding component has a mounting portion for the mating seat to enclose, and the ratchet is coaxially fixed to the mounting portion; the pawl is rotatably mounted in the mating seat and driven by the elastic element, so that the pawl tends to engage with the ratchet. When the winding component rotates in the winding direction, the ratchet can rotate relative to the pawl; when the winding component rotates in the unwinding direction, the pawl engages with the teeth of the ratchet to limit the rotation.

[0014] By adopting the above technical solution and setting up the ratchet and pawl, a one-way self-locking function for the winding component is achieved. When the operator rotates the winding component in the winding direction, the ratchet can rotate smoothly relative to the pawl, and the operation process is not affected. When the operation stops or the winding component is subjected to reverse tension, the pawl can automatically engage with the teeth of the ratchet, immediately preventing it from rotating in the unwinding direction.

[0015] Optionally, the pawl has a lever that extends beyond the mating seat and is movable relative to the mating seat. By moving the lever, the pawl can be pulled away from the ratchet.

[0016] By adopting the above technical solution, when it is necessary to loosen the pull rope, manually move or press the lever to overcome the resistance of the elastic element, so that the pawl and ratchet disengage, thereby releasing the one-way locking state.

[0017] Optionally, the winding assembly also includes a fine-tuning element that is threadedly adjustable on the base and opposite the pull cord to press against it.

[0018] By adopting the above technical solution, and by using the threaded moving fine-tuning component to press its end against the pull rope, the local tension of the pull rope can be steplessly fine-tuned without changing the ratchet locking position, thus achieving compensation for the tension of the pull rope.

[0019] Optionally, the construction system also includes diagonal bracing, which is inclined and supported between the support foundation and the side of the main support frame, and diagonal bracing is installed on both sides of the main support frame.

[0020] By adopting the above technical solution, and by setting inclined braces on both sides of the main support frame between it and the supporting foundation, additional lateral support is provided for the main support frame. This enhances the overall lateral stiffness and anti-overturning capacity of the main support frame.

[0021] Secondly, this application provides a construction method for a construction system used in bridge confined space casting, employing the following technical solution: A construction method for a construction system used in bridge construction in confined spaces includes the following steps: S1, Fix the embedded parts to the support foundation; S2, fix the bottom of the main support frame to the embedded parts and fix the top to the poured beam; S3, Pump pipe assembly layout and fixing: Install longitudinal pump pipes and transverse pump pipes in sequence, and fix the longitudinal pump pipes with a support device.

[0022] In summary, this application includes at least one of the following beneficial effects: 1. The main support frame, which is erected longitudinally between the supporting foundation and the cast-in-place beam, provides an independent vertical extension channel for the pump pipe. The longitudinal pump pipe is supported by the support device, and the cast-in-place beam supports the transverse pump pipe, so that normal operations of pump pipe laying and concrete pouring can be carried out in narrow and confined areas. 2. The topmost main support unit achieves precise benchmark positioning through threaded adjustment, while the remaining auxiliary support units utilize a linkage device with reciprocating pull ropes. This allows for simultaneous and uniform adjustment of the support rods of all auxiliary support units with a single drive action. This greatly simplifies the installation and adjustment process of multiple support devices, and not only can it quickly adapt to pump pipes of different sizes, but it can also quickly release the restriction on the pump pipe by unwinding the pull ropes, improving construction efficiency during installation and dismantling. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of Embodiment 1 of this application; Figure 2 This is a schematic diagram of the structure of the main support frame and the longitudinal pump pipe in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the support device in Embodiment 1 of this application; Figure 4 yes Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the drive component in Embodiment 2 of this application; Figure 6 This is a cross-sectional view of the driving component in Embodiment 2 of this application.

[0024] Explanation of reference numerals in the attached drawings: 1. Main support frame; 2. Support foundation; 3. Cast-in-place beam; 4. Pump pipe assembly; 41. Longitudinal pump pipe; 42. Transverse pump pipe; 5. Support device; 51. First abutment; 52. Second abutment; 53. Outer frame; 6. Main support unit; 7. Secondary support unit; 8. Pull rope; 9. Rewinding assembly; 91. Base; 92. Rewinding component; 921. Rewinding shaft; 922. Rewinding reel; 93. Drive component; 931. Mating seat; 932. Ratchet; 933. Pawl; 934. Elastic component; 10. Mounting part; 11. Altering component; 12. Fine-tuning component; 13. Diagonal brace; 14. Embedded component; 15. Adjusting frame; 16. Sliding block; 17. Slide groove. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 To be continued Figure 6 This application will be described in further detail.

[0026] Example 1:

[0027] This application discloses a construction system for pouring concrete in confined spaces in bridges. (Refer to...) Figure 1 and Figure 2 The construction system for pouring concrete in confined spaces in bridges includes a main support frame 1, a pump pipe assembly 4, a support device 5, and diagonal braces 13. The main support frame 1 is erected longitudinally and connected between the support foundation 2 and the already poured beam 3. The diagonal braces 13 support the main support frame 1 and the support foundation 2, reinforcing the main support frame 1. The pump pipe assembly 4 is installed on both the main support frame 1 and the already poured beam 3. The support device 5 is installed within the main support frame 1 to support the pump pipe assembly 4.

[0028] Specifically, in this embodiment, the supporting foundation 2 is a steel trestle bridge during bridge construction. The main support frame 1 is assembled from 321-type Bailey beams and is a longitudinally erected portal frame structure, consisting of two sets of Bailey beam units. Each set of Bailey beam units is composed of multiple Bailey beams assembled vertically, and the two sets of Bailey beam units are distributed laterally and fixed by connecting frames. I-beam-shaped embedded parts 14 are fixed on the steel trestle bridge. The bottom of the main support frame 1 is fixedly connected to the embedded parts 14, and the top is close to the cast-in-place beam 3. It is limited and fixed by expansion bolts and steel connectors, so as to achieve vertical and stable erection of the main support frame 1 between the steel trestle bridge and the cast-in-place beam 3.

[0029] The diagonal braces 13 can be made of channel steel and are symmetrically arranged on both sides of the main support frame 1. One end of the diagonal brace 13 is welded and fixed to the steel trestle, and the other end is welded and fixed to the chord of the main support frame 1, forming a triangular force-bearing structure. The diagonal braces 13 utilize their own bending and shear resistance to enhance the lateral stiffness of the main support frame 1, resist the horizontal reaction force and wind load during the concrete pumping process, and make the main support frame 1 less prone to lateral displacement or deformation, thereby further improving the stability of the overall system.

[0030] Pump pipe assembly 4 serves as a concrete delivery channel, comprising a longitudinal pump pipe 41 and a transverse pump pipe 42, both of which are 125mm diameter concrete delivery pump pipes in this embodiment. The longitudinal pump pipe 41 extends vertically along the interior of the main support frame 1, with its lower end connected to the pumping device on the steel trestle via a right-angle bend, and its upper end extending to the beam surface of the already poured beam 3 via a right-angle bend. The transverse pump pipe 42 is placed on the beam surface and extended according to the location of the segment to be poured. The direction of the transverse pump pipe 42 is adjusted via a three-way connector pipe (not shown in the figure) to meet the concrete pouring requirements of different parts. A support platform can be installed on the beam surface to support the transverse pump pipe 42, and a trailer pump is selected as the pumping device.

[0031] Reference Figure 2 and Figure 3 The support device 5 is installed between the main support frame 1 and the longitudinal pump pipe 41 to provide circumferential clamping and radial support for the longitudinal pump pipe 41, preventing radial and axial displacement of the longitudinal pump pipe 41 under high-pressure concrete pumping conditions. Multiple sets of support devices 5 are spaced apart along the height direction of the main support frame 1 to form a multi-point uniform support system. The number of sets of support devices 5 is set according to the required height of the main support frame 1. In this embodiment, four sets are shown as an example; in other embodiments, there can be seven, eight, or nine sets of support devices 5, etc.

[0032] Each set of support devices 5 includes an outer frame 53, a first abutment 51, and a second abutment 52. The outer frame 53 is square-shaped, and its size is adapted to the inner circumference of the main support frame 1. The outer frame 53 is detachably installed in the main support frame 1 by bolts, serving as the installation foundation for the first abutment 51 and the second abutment 52, and also reinforcing the structure of the main support frame 1. Each set of support devices 5 has two first abutments 51 and two second abutments 52. The two first abutments 51 are parallel to each other and connected in the outer frame 53, and the two second abutments 52 are also parallel to each other and connected in the outer frame 53. The first abutments 51 and the second abutments 52 are arranged vertically in layers and perpendicular to each other in a "well" shape. The longitudinal pump pipe 41 is clamped in the space enclosed by the first abutments 51 and the second abutments 52.

[0033] In some embodiments, the first abutment 51 and the second abutment 52 can be fixed to the outer frame 53. In this embodiment, both the first abutment 51 and the second abutment 52 can slide relative to the outer frame 53, and the two first abutments 51 slide along the distribution direction of the first abutment 51, and the two second abutments 52 slide along the distribution direction of the second abutment 52, so that the sliding directions of the first abutment 51 and the second abutment 52 are mutually perpendicular horizontal, so that the positions of the first abutment 51 and the second abutment 52 can be adjusted according to the size of the pump pipe.

[0034] Reference Figure 2 and Figure 3 Furthermore, the multiple sets of support devices 5 are divided into main support units 6 and secondary support units 7. The set of support devices 5 located at the top of the main support frame 1 is the main support unit 6, and all other support devices 5 are secondary support units 7.

[0035] The inner walls of the four sides of the outer frame 53 of the main support unit 6 are all fixed with U-shaped adjustment frames 15. The adjustment frame 15 has a screw parallel to the corresponding side. The first abutment 51 and the second abutment 52 are respectively slidably sleeved on the screw of the corresponding adjustment frame 15. The screw is threaded with nuts for pressing the opposite sides of the first abutment 51 or the second abutment 52. The position of the first abutment 51 and the second abutment 52 is adjusted by adjusting the position of the nuts, and the adjusted first abutment 51 and the second abutment 52 are positioned relative to the outer frame 53.

[0036] Reference Figure 3 and Figure 4 The outer frame 53 of the secondary support unit 7 does not have an adjustment bracket 15. Both the first abutment 51 and the second abutment 52 of the secondary support unit 7 have sliders 16 at their ends. A groove 17 is formed along the edge of the outer frame 53 on its inner circumference for the sliders 16 to slide. The first abutment 51 and the second abutment 52 slide within the outer frame 53 through the cooperation of the sliders 16 and the grooves 17. Simultaneously, the first abutment 51 and the second abutment 52 of the secondary support unit 7 are synchronously adjusted and locked via a linkage device. Specifically, four sets of linkage devices are provided, each corresponding to one of the two first abutments 51 and two second abutments 52 of all secondary support units 7, enabling synchronous and unidirectional sliding of the same type of abutment.

[0037] Reference Figure 3 The four sets of linkage devices have the same structure. Each set of linkage devices includes a pull rope 8 and a winding assembly 9. The pull rope 8 is made of steel wire rope or galvanized steel strand. Taking the pull rope 8 corresponding to the first abutment 51 as an example, one end of the pull rope 8 is fixed to the first abutment 51 corresponding to the main support unit 6, and the other end slides downward and passes through the first abutment 51 corresponding to each auxiliary support unit 7 in sequence, so that the pull rope 8 forms a tortuous and reciprocating path along the height direction of the main support frame 1, and finally winds onto the winding assembly 9. The cooperation between the second abutment 52 and the corresponding pull rope 8 is the same.

[0038] The winding assembly 9 is installed on the operating platform of the steel trestle for easy ground operation. The winding assembly 9 includes a base 91, a winding component 92, and a drive component 93. The base 91 is fixed to the steel trestle by expansion bolts, providing a stable installation foundation for the winding assembly 9. The winding component 92 includes a winding shaft 921 and a winding reel 922. The winding shaft 921 is rotatably connected to the base 91, and the winding reel 922 is fixedly sleeved on the winding shaft 921. In this embodiment, pull ropes 8 are threaded through both ends of the first abutment 51 and both ends of the second abutment 52. The axial direction of the winding shaft 921 is parallel to the length direction of the corresponding abutment. Two winding reels 922 are axially arranged on the winding shaft 921 to correspond to the pull ropes 8 at both ends of the abutment. The pull ropes 8 are wound around the corresponding winding reels 922.

[0039] Reference Figure 2 and Figure 3 The winding and unwinding of the pull rope 8 is achieved by rotating the take-up shaft 921. In this embodiment, the drive unit 93 is a reversible geared motor. The motor is fixedly mounted on the base 91 and its output end is coaxially connected to the take-up shaft 921. The reversible rotation of the motor drives the drum to rotate, realizing the automatic winding and unwinding of the pull rope 8. When the pull rope 8 is winding, it can drive the abutment rods of the auxiliary support unit 7 to slide towards the longitudinal pump pipe 41 until the pull rope 8 is taut. At this point, all the abutment rods of the auxiliary support unit 7 press against the longitudinal pump pipe 41, realizing rapid adjustment and positioning of the abutment rod position.

[0040] Furthermore, in some embodiments, the contact surfaces of the first abutment rod 51, the second abutment rod 52, and the longitudinal pump pipe 41 are all covered with a rubber layer. This reduces damage to the outer wall of the pump pipe caused by hard metal contact, increases the coefficient of friction to prevent slippage of the pump pipe, and absorbs pumping vibration, reducing the transmission of vibration to the main support frame 1. Additionally, in some embodiments, pre-compression springs (not shown in the figures) can be provided between the first abutment rod 51, the second abutment rod 52, and the sliding groove 17 of the outer frame 53 in the secondary support unit 7. The springs are coaxially arranged along the sliding direction of the abutment rods, with one end fixed to the inner side of the outer frame 53 and the other end fixed to the slider 16 of the abutment rod. The springs always provide an elastic pre-tightening force to the abutment rods in the direction close to the longitudinal pump pipe 41, achieving continuous contact between the abutment rods and the pump pipe and automatically compensating for the small gaps caused by pumping vibration.

[0041] This application also discloses a construction method for a construction system used in bridge construction in confined spaces, comprising the following steps: S1, Installation of embedded part 14: Cut the steel plate of the steel trestle bridge deck to expose the lower I-beam, and weld the embedded part 14 to the I-beam of the steel trestle bridge to ensure reliable connection.

[0042] S2, Installation of main support frame 1: While assembling the main support frame 1, the support device 5 is installed into the main support frame 1. The bottom of the assembled main support frame 1 is connected and fixed to the embedded part 14, and the top is close to the poured beam 3. Expansion bolts are used in conjunction with steel connectors for limiting and fixing, so that the main support frame 1 is vertically stable.

[0043] S3, Installation of diagonal brace 13: On both sides of the main support frame 1, weld one end of the diagonal brace 13 to the steel trestle bridge and the other end to the chord of the main support frame 1.

[0044] S4, Pump Pipe Assembly 4 Installation: First, connect the lower end of the longitudinal pump pipe 41 to the trailer pump on the steel trestle via an elbow, and lead the upper end to the surface of the already poured beam 3 via an elbow. Then, install the longitudinal pump pipe 41 and the transverse pump pipe 42 sequentially from bottom to top. Next, adjust the first abutment rod 51 and the second abutment rod 52 of the main support unit 6 and lock their positions with nuts as a reference. Then, through the linkage device, use the winding assembly 9 to wind up the pull rope 8, synchronously driving the first abutment rod 51 and the second abutment rod 52 of all the auxiliary support units 7 to move towards the center until they are evenly pressed against the longitudinal pump pipe 41.

[0045] Example 2:

[0046] The difference between this embodiment and Embodiment 1 lies in the driving component 93. This embodiment uses a ratchet and pawl type manual driving component, which is suitable for scenarios where power supply conditions are limited at the construction site.

[0047] Reference Figure 5 and Figure 6 Specifically, in this embodiment, the driving component 93 includes a mating seat 931, a ratchet 932, a pawl 933, and an elastic element 934. The mating seat 931 is fixedly mounted on the base 91 and has a portion that coaxially surrounds the winding shaft 921 of the winding component 92. The middle part of the winding shaft 921 is located inside the mating seat 931, forming a mounting portion 10 for the mating seat 931 to surround. The ratchet 932 is coaxially fixedly sleeved on the mounting portion 10 and rotates synchronously with the winding component 92.

[0048] The pawl 933 is rotatably mounted inside the mating seat 931. One end of the pawl is a toothed end, which is adapted to the tooth groove of the ratchet 932. The pawl 933 has a lever 11 extending out of the outer periphery of the mating seat 931. The lever 11 is easy to operate manually to realize the rotation control of the pawl 933. In this embodiment, the lever 11 is a rod-shaped part whose axis is parallel to and offset from the rotation axis of the pawl 933.

[0049] The elastic element 934 is a spring or torsion spring, connected between the pawl 933 and the mating seat 931, providing a continuous elastic driving force for the pawl 933 to move towards the ratchet 932, so that the pawl 933 always tends to engage with the ratchet 932.

[0050] When the rope 8 is wound up, the hand crank of the winding component 92 is manually turned, which drives the winding component 92 and the ratchet 932 to rotate synchronously in the winding direction. At this time, the tooth surface of the ratchet 932 pushes the locking end of the pawl 933 to compress the elastic element 934, so that the pawl 933 rotates slightly around the rotating axis. The ratchet 932 can rotate smoothly relative to the pawl 933, realizing the manual winding of the rope 8, and driving the abutment of the auxiliary support unit 7 to slide towards the pump pipe.

[0051] After winding is complete, release the hand crank. Under the driving force of the elastic element 934, the locking end of the pawl 933 engages in the tooth groove of the ratchet 932. Because the locking end of the pawl 933 and the tooth groove of the ratchet 932 abut against each other, the ratchet 932 is restricted from rotating in the unwinding direction, thereby achieving one-way self-locking of the winding component 92 and preventing the pull rope 8 from coming loose. When it is necessary to unwind the pull rope 8, manually move the lever 11 of the pawl 933 away from the ratchet 932, so that the locking end of the pawl 933 disengages from the tooth groove of the ratchet 932, releasing the engagement constraint between the ratchet 932 and the pawl 933. At this time, the hand crank can be rotated in the opposite direction to drive the drum to rotate in the unwinding direction, thereby unwinding the pull rope 8.

[0052] Furthermore, the drive component 93 also includes a fine-tuning component 12, which is a threaded adjustment rod. The threaded adjustment moves on the base 91, and its end is opposite to the outside of the pull rope 8. By turning the fine-tuning component 12, the pressure adjustment of the pull rope 8 can be achieved to compensate for the slight slack of the pull rope 8.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction system for casting in the narrow space of a bridge, characterized in that, include: The main support frame (1) is erected longitudinally and connected between the supporting foundation (2) and the cast-in-place beam (3); The pump pipe assembly (4) includes a longitudinal pump pipe (41) and a transverse pump pipe (42); the longitudinal pump pipe (41) is connected between the pumping device and the transverse pump pipe (42), and the longitudinal pump pipe (41) extends in the main support frame (1); the transverse pump pipe (42) is arranged along the cast-in-place beam (3); as well as Support device (5) is installed between main support frame (1) and longitudinal pump pipe (41) to support longitudinal pump pipe (41), and multiple sets of support device (5) are arranged at intervals along the height direction of main support frame (1).

2. A construction system for casting in tight spaces of bridges according to claim 1, characterized in that: Each set of support devices (5) includes a first abutment (51) and a second abutment (52); the first abutment (51) has two parallel sides, and the second abutment (52) has two parallel sides, and the two first abutments (51) and the second abutment (52) are arranged in a cross pattern and together clamp the longitudinal pump pipe (41) circumferentially along the longitudinal pump pipe (41).

3. A construction system for casting in tight spaces of bridges according to claim 2, characterized in that: Each set of support devices (5) also includes an outer frame (53), which is installed in the main support frame (1). The first abutment (51) and the second abutment (52) slide vertically in the outer frame (53), and the sliding direction of the first abutment (51) is perpendicular to the sliding direction of the second abutment (52). The support device (5) at the top is the main support unit (6), and the other support devices (5) form the secondary support unit (7); the first abutment (51) and the second abutment (52) in the main support unit (6) are locked by thread adjustment, and the first abutment (51) and the second abutment (52) in the secondary support unit (7) are locked by linkage device adjustment. The linkage device has four sets, and the four sets of linkage devices cooperate with the two first abutments (51) and the two second abutments (52) of each set of support units to adjust and move the two first abutments (51) and the two second abutments (52) towards the longitudinal pump pipe (41).

4. A construction system for casting in tight spaces of bridges according to claim 3, characterized in that: Each linkage device includes a pull rope (8) and a winding assembly (9); one end of the pull rope (8) is fixed to the first abutment (51) or the second abutment (52) of the main support unit (6), and the pull rope (8) slides through the first abutment (51) or the second abutment (52) of each auxiliary support unit (7) in sequence, so that the pull rope (8) extends downward along the tortuous reciprocating path until it is wound onto the winding assembly (9), and the winding assembly (9) is installed on the support foundation (2).

5. A construction system for casting in tight spaces of bridges according to claim 4, characterized in that: The winding assembly (9) includes a base (91), a winding component (92), and a drive component (93); the base (91) is fixedly installed on the support base (2), the winding component (92) is rotatably connected to the base (91) and winds up and unwinds the pull rope (8) by rotating, and the drive component (93) cooperates with the winding component (92) to drive the winding component (92) to rotate.

6. A construction system for casting in tight spaces of bridges according to claim 5, characterized in that: The drive component (93) includes a mating seat (931), a ratchet (932), a pawl (933), and an elastic element (934); the mating seat (931) is mounted on the base (91), the winding component (92) has a mounting portion (10) for the mating seat (931) to enclose, and the ratchet (932) is coaxially fixed to the mounting portion (10); the pawl (933) is rotatably mounted in the mating seat (931) and driven by the elastic element (934), so that the pawl (933) tends to engage with the ratchet (932); When the winding component (92) rotates in the winding direction, the ratchet (932) can rotate relative to the pawl (933); when the winding component (92) rotates in the unwinding direction, the pawl (933) engages with the working surface of the tooth groove of the ratchet (932) to restrict rotation.

7. A construction system for pouring concrete in confined spaces in bridges according to claim 6, characterized in that: The pawl (933) has a lever (11) that extends out of the mating seat (931) and can move relative to the mating seat (931). By moving the lever (11), the pawl (933) can be pulled to move away from the ratchet (932).

8. A construction system for pouring concrete in confined spaces in bridges according to claim 6, characterized in that: The winding assembly (9) also includes a fine-tuning element (12) which is threadedly adjustable on the base (91) and opposite to the pull rope (8) for pressing against the pull rope (8).

9. A construction system for pouring concrete in confined spaces in bridges according to claim 1, characterized in that: The construction system also includes diagonal bracing (13), which is inclined to support the support foundation (2) and the side of the main support frame (1), and diagonal bracing (13) is installed on both sides of the main support frame (1).

10. A construction method for a construction system used in bridge construction in confined spaces, characterized in that... Includes the following steps: S1, fix the embedded part (14) to the supporting foundation (2); S2, fix the bottom of the main support frame (1) to the embedded part (14) and fix the top to the poured beam (3); S3, Pump pipe assembly (4) is laid out and fixed. The longitudinal pump pipe (41) and the transverse pump pipe (42) are installed in sequence, and the longitudinal pump pipe (41) is fixed by the support device (5).

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