Novel main truss assembly type cantilever bridge girder erection machine

Abstract

The utility model provides a novel main truss assembly type cantilever bridge -building machine, including main truss and front saddle beam and rear saddle beam, the below of left and right sides of front saddle beam is provided with walking wheel system and walking track, the left and right ends of front saddle beam all are provided with front C type connecting beam, main trash is provided with left and right two, and its overall structure is inverted trapezoidal frame structure, and the top of two main trusses is connected in the bottom end of two front C type connecting beams respectively and is hung in the below of the flange of bridge both sides, the left and right ends of rear saddle beam all are provided with rear C type connecting beam, and the bottom end of rear C type connecting beam is fixedly connected with the tail end of main truss through reverse top system. The novel main truss assembly type cantilever bridge -building machine provided by the utility model has excellent main truss mechanical property, and has the advantages of reasonable structure setting, high modular degree and remarkable economy.

Description

Technical Field

[0001] This utility model belongs to the field of bridge building machine technology, specifically relating to a new type of under-bearing cantilever bridge building machine for cast-in-place beam construction. Background Technology

[0002] In modern bridge construction, the under-deck bridge-building machine, as a core construction equipment, offers significant advantages over traditional hanging basket technology in terms of construction precision, engineering efficiency, and cost control through its modular construction process. It is particularly suitable for bridge construction in complex terrain and densely trafficked areas. However, current under-deck bridge-building machine technology still faces several bottlenecks that urgently need to be addressed, mainly in the following aspects: First, the main truss adopts a fixed structural design, whose rigidity leads to a reduced equipment reuse rate and insufficient adaptability to diverse bridge engineering needs, indirectly increasing construction costs. Second, bridge cantilever construction involves multiple stages, including lowering, traveling, lifting, and anchoring of the bridge-building machine, as well as rebar tying, internal and external formwork installation, prestressing tensioning, and concrete pouring and curing, requiring improved construction efficiency. Third, the equipment's anti-overturning performance is weak during operation and travel, and the existing anchoring system lacks reliability, posing potential safety hazards. To address these issues, future technological innovation in under-deck bridge-building machines should focus on the following key directions: First, optimizing the main truss structure to improve the equipment's adaptability to different engineering needs, increase reuse rate, and reduce construction costs. Second, optimize the construction process and reduce the time spent on connecting different procedures. Third, improve the design of the anchoring system to enhance the stability of the equipment under complex working conditions and ensure construction safety. By optimizing the main structural form of the under-deck bridge-building machine and promoting the modularization and diversification of the construction system's structural applicability, we can drive the research and development and application of a new generation of high-performance bridge-building machines, thereby better meeting the increasingly diverse construction needs of modern bridge engineering. Summary of the Invention

[0003] The purpose of this utility model is to provide a new type of main truss assembled cantilever bridge building machine to solve the problems existing in the current bridge building machine in the background art. The main truss of this bridge building machine has excellent mechanical properties and has the advantages of reasonable structural design, high degree of modularity, and significant economic benefits.

[0004] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows: A novel main truss prefabricated cantilever bridge building machine includes at least a main truss, a front saddle beam, and a rear saddle beam. The left and right sides of the front saddle beam are equipped with a traveling wheel system and a traveling track. Both ends of the front saddle beam are provided with front C-shaped connecting beams. The top of the front C-shaped connecting beams is connected and fixed to the front saddle beams, and the bottom of the front C-shaped connecting beams is located below the two side flanges of the bridge. The main truss consists of two main trusses, one on the left and one on the right. The overall structure is an inverted trapezoidal frame structure. The tops of the two main trusses are respectively connected to the bottom ends of two front C-shaped connecting beams and suspended below the flanges on both sides of the bridge. The front saddle beam is equipped with liftable tie rods on both the left and right sides. The liftable tie rods pass vertically through the flanges on both sides of the bridge, with their tops fixed to the front saddle beam and their bottoms fixed to the main truss. Both ends of the rear saddle beam are provided with rear C-shaped connecting beams. The top of the rear C-shaped connecting beams is connected and fixed to the rear saddle beams, and the bottom of the rear C-shaped connecting beams is located below the flanges on both sides of the bridge and is fixedly connected to the tail end of the main truss through the anti-top system.

[0005] Furthermore, the main truss consists of an upper main truss beam, a lower main truss beam, diagonal main truss members, and vertical main truss members, with its internal supports distributed in a right-angled triangle pattern, and each member is connected and fixed by a pin.

[0006] Furthermore, a fixing beam is provided at the bottom of the front C-shaped connecting beam, and the fixing beam is connected and fixed to the middle of the upper beam of the main truss.

[0007] Furthermore, the upper beam of the main truss is hinged to a fixed seat by a pin; the fixed seat is connected and fixed to the bottom end of the liftable tie rod, and a first wedge block is provided on the top of the fixed seat, with the top surface of the first wedge block abutting against the lower surface of the bridge flange.

[0008] Furthermore, the anti-jacking system includes a second wedge block, an anti-jacking cylinder, and a hinged anti-jacking wheel. The anti-jacking cylinder is fixed to the tail end of the upper beam of the main truss. The top of the piston rod of the anti-jacking cylinder is connected and fixed to the second wedge block, and the top surface of the second wedge block abuts against the lower surface of the bridge flange. The hinged anti-jacking wheel adopts a multi-degree-of-freedom movable hinge mechanism, and its roller abuts against the lower surface of the bridge flange.

[0009] Furthermore, a rear anchor hanger is provided in the second wedge block, with the top of the rear anchor hanger anchored to the bridge, and the rear anchor hanger fixes the second wedge block to the lower part of the two flanges of the bridge.

[0010] Furthermore, the anti-top system is also equipped with a horizontal bracing cylinder, which is horizontally positioned between the main truss upper beam and the bridge side wall for support; a horizontal tie rod is also installed between the main truss upper beam and the bridge side wall for locking.

[0011] Furthermore, a limiting wheel is also provided below the hinged anti-top wheel. The limiting wheel is laterally positioned between the main truss upper beam and the bridge side wall, and the roller in the limiting wheel abuts against the bridge side wall.

[0012] Furthermore, an internal mold system is also provided, which includes an internal mold template truss, a guide beam, and sliding wheels. The guide beam is longitudinally arranged inside the bridge, and the sliding wheels are fixed to the bottom of the internal mold template truss and located on the guide beam. The internal mold template truss moves longitudinally along the guide beam under the action of the sliding wheels.

[0013] Furthermore, the guide beam is fixed by a guide beam suspension, and the top of the guide beam suspension is fixed to the beam surface of the bridge.

[0014] Compared with the prior art, the novel main truss prefabricated cantilever bridge building machine provided by this utility model has the following advantages: 1. Excellent mechanical properties of the main truss: The main truss consists of the main truss upper beam, the main truss lower beam, the main truss vertical members, and the main truss diagonal members, which are distributed in a right-angled triangle. The load transfer path is clear, which can effectively reduce stress concentration.

[0015] 2. Reasonable structural design: The main body adopts a front and rear double saddle beam structure. The front saddle beam bears the construction load and the weight of the saddle beam, while the rear saddle beam provides lateral tension when the bridge-building machine is in motion, ensuring that the left and right truss plates of the bridge-building machine move forward in parallel and are not easily twisted.

[0016] 3. High degree of modularity and significant economic benefits: The main truss members are prefabricated in the factory, eliminating the need for secondary processing on site and reducing material loss; each member adopts a standardized interface design, and rapid assembly and disassembly are achieved through pin connections, reducing the volume of the transport unit.

[0017] 4. Improved construction efficiency: An inner formwork sliding device is installed between the inner formwork truss and the guide beam. This device mainly consists of a frame and sliding wheels. This device allows the inner formwork of the box girder to slide out after the bottom formwork, side formwork and other systems. The steel reinforcement skeleton can be prefabricated and hoisted into the formwork in sections or as a whole, which speeds up the construction efficiency and installation accuracy.

[0018] 5. Improved anti-overturning stability: This solution replaces the traditional bridge deck anchorage and eliminates the risk of overturning by acting on the lower part of the completed box girder flange plate through the anti-top system. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of the main truss assembled cantilever bridge building machine of this utility model; Figure 2 for Figure 1 Sectional view I-I; Figure 3 for Figure 1 Sectional view II-II; Figure 4 This is a front view of the reverse top system; Figure 5 This is a front view of the inner mold carriage system; In the diagram: 1. Main truss; 11. Main truss upper beam; 12. Main truss lower beam; 13. Main truss diagonal member; 14. Main truss vertical member; 2. Front saddle beam; 21. Front C-shaped connecting beam; 22. Fixed beam; 23. First wedge block; 24. Liftable tie rod; 3. Rear saddle beam; 31. Rear C-shaped connecting beam; 4. Walking wheel system; 5. Walking track; 6. Anti-jacking system; 61. Anti-jacking cylinder; 62. Second wedge block; 63. Hinged anti-jacking wheel; 64. Horizontal brace cylinder; 65. Limiting wheel; 66. Rear anchor hanger; 67. Horizontal tie rod; 7. Guide beam; 71. Guide beam hanger; 8. Sliding wheel; 9. Inner formwork system; 91. Inner formwork truss; 10. Bottom formwork system. Detailed Implementation

[0020] The technical solution of this utility model patent will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] This utility model provides a novel main truss assembled cantilever bridge building machine, the structure of which is as follows: Figures 1-3 As shown, it includes a main truss 1, a front saddle beam 2, and a rear saddle beam 3. A wheel system 4 and a track 5 are installed on the lower left and right sides of the front saddle beam 2. The main truss 1 has two sections, left and right, and its overall structure is an inverted trapezoidal frame structure. The main truss 1 consists of an upper main truss beam 11, a lower main truss beam 12, diagonal main truss members 13, and vertical main truss members 14. Its internal supports are distributed in a right-angled triangle, and all members are connected and fixed by pins. The members in the main truss 1 adopt a standardized interface design, and the pin connections enable the assembly and disassembly of main trusses of different sizes to adapt to the construction needs of box girders with different spans. Both ends of the front saddle beam 2 are provided with front C-shaped connecting beams 21. The top of the front C-shaped connecting beams 21 is connected and fixed to the front saddle beam 1, and the bottom of the front C-shaped connecting beams 21 is located below the two side flanges of the bridge. The tops of the two main trusses 1 are respectively connected to the bottom ends of the two front C-shaped connecting beams 21 and suspended below the two side flanges of the bridge. The bottom of the front C-shaped connecting beams 21 is provided with a fixing beam 22, which is connected and fixed to the middle of the upper beam 11 of the main truss.

[0022] Liftable tie rods 24 are installed on both sides of the front saddle beam 2. The liftable tie rods 24 pass vertically through the flanges on both sides of the bridge, with their tops fixed to the front saddle beam 2 and their bottoms fixed to the main truss 1. The upper beam 11 of the main truss is hinged to a fixed seat by a pin. The fixed seat is connected and fixed to the bottom end of the liftable tie rod 24. The top of the fixed seat is provided with a first wedge block 23, and the top surface of the first wedge block 23 abuts against the lower surface of the bridge flange. Before the bridge-building machine starts the cast-in-place beam construction, the liftable tie rods 24 on the front saddle beam 2 are raised to lock the main truss 1 against the concrete surface below the flanges on both sides of the bridge through the first wedge block 23.

[0023] Both ends of the rear saddle beam 3 are provided with rear C-shaped connecting beams 31. The top of the rear C-shaped connecting beams 31 is connected and fixed to the rear saddle beam 3. The bottom of the rear C-shaped connecting beams 31 is located below the flanges on both sides of the bridge and is fixedly connected to the tail end of the main truss 1 through the anti-top system 6.

[0024] The structure of the anti-top system 6 is as follows Figure 3 and Figure 4 As shown, the bridge construction machine includes a second wedge block 62, a counter-jacking cylinder 61, and a hinged counter-jacking wheel 63. The counter-jacking cylinder 61 is fixed to the tail end of the upper beam 11 of the main truss. The top of the piston rod of the counter-jacking cylinder 61 is connected and fixed to the second wedge block 62, and the top surface of the second wedge block 62 abuts against the lower surface of the bridge flange. A rear anchor hanger 66 is provided in the second wedge block 62, and the top of the rear anchor hanger 66 is anchored to the bridge, fixing the second wedge block 62 to the lower surface of the two side flanges of the bridge. Under concrete pouring conditions, the second wedge block acts as a rigid load-bearing body, directly transmitting the rear support reaction force to the poured beam segment. The hinged counter-jacking wheel 63 adopts a multi-degree-of-freedom movable hinge mechanism. Its roller abuts against the lower surface of the bridge flange and adaptively conforms to the concrete surface under traveling conditions to bear the rear support reaction force, ensuring the overall stability of the bridge construction machine. Below the hinged anti-jacking wheel 63, a limiting wheel 65 is also provided. The limiting wheel 65 is laterally positioned between the main truss upper beam 11 and the bridge side wall, and the roller in the limiting wheel 65 abuts against the bridge side wall. The anti-jacking system 6 is also provided with a horizontal bracing cylinder 64, which is laterally positioned between the main truss upper beam 11 and the bridge side wall for support; a horizontal tie rod 67 is also provided between the main truss upper beam 11 and the bridge side wall for locking.

[0025] The structure of the internal mold system 9 is as follows: Figure 5As shown, the system includes an inner formwork truss 91, a guide beam 7, and sliding wheels 8. The guide beam 7 is longitudinally positioned inside the bridge. The sliding wheels 8 are fixed to the bottom of the inner formwork truss 91 and located on the guide beam 7. The inner formwork system 9 moves longitudinally along the guide beam 7 under the action of the sliding wheels 8. The guide beam 7 is fixed by a guide beam hanger 71, the top of which is fixed to the beam surface of the bridge. In this invention, the coordinated movement of the sliding wheels and the guide beam enables the inner formwork system to slide backward relative to the bottom and side formwork systems, providing a working space for construction.

[0026] The working process of the bridge-building machine provided by this utility model is as follows: Before constructing the cast-in-place beam, the liftable tie rod on the front saddle beam is raised to lock the main truss against the concrete surface below the flanges on both sides of the bridge using wedge blocks. The rear saddle beam is then connected to a counter-jacking system to lock the rear end of the bridge-building machine onto the flange plates on both sides of the bridge. Holes are pre-drilled on the flanges and web of the bridge, and rear anchors are inserted to fix the wedge blocks below the flanges on both sides of the bridge. The counter-jacking system adjusts the lateral position of the bridge-building machine using an extension cross brace cylinder and then installs a lateral tie rod for locking. During operation, the bottom formwork system 10 at the front increases the load, and the rear end is counter-jacked using a counter-jacking cylinder. The dual locking of the front and rear saddle beams enhances the anti-overturning capability of the bridge-building machine during construction. When the bridge-building machine is traveling, the liftable tie rod, rear anchor hanger, and transverse tie rod are removed. The hinged anti-top wheel and limit wheel in the rear top system are adjusted to make them fit tightly against the concrete surface below the flanges on both sides of the bridge and the concrete surface of the bridge web to form a dynamic lock. The upper traveling wheel system moves the bridge-building machine on the traveling track.

[0027] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A novel main truss prefabricated cantilever bridge-building machine, comprising at least a main truss, a front saddle beam, and a rear saddle beam, wherein a traveling wheel system and a traveling track are provided below the left and right sides of the front saddle beam, characterized in that: Both ends of the front saddle beam are provided with front C-shaped connecting beams. The top of the front C-shaped connecting beams is connected and fixed to the front saddle beams, and the bottom of the front C-shaped connecting beams is located below the two side flanges of the bridge. The main truss consists of two main trusses, one on the left and one on the right. The overall structure is an inverted trapezoidal frame structure. The tops of the two main trusses are respectively connected to the bottom ends of two front C-shaped connecting beams and suspended below the flanges on both sides of the bridge. The front saddle beam is equipped with liftable tie rods on both the left and right sides. The liftable tie rods pass vertically through the flanges on both sides of the bridge, with their tops fixed to the front saddle beam and their bottoms fixed to the main truss. Both ends of the rear saddle beam are provided with rear C-shaped connecting beams. The top of the rear C-shaped connecting beams is connected and fixed to the rear saddle beams, and the bottom of the rear C-shaped connecting beams is located below the flanges on both sides of the bridge and is fixedly connected to the tail end of the main truss through the anti-top system.

2. The new type of main truss assembly type cantilever bridge maker according to claim 1, characterized in that: The main truss consists of the main truss upper beam, the main truss lower beam, the main truss diagonal members, and the main truss vertical members. Its internal supports are distributed in a right-angled triangle, and each member is connected and fixed by a pin.

3. The new type of main truss assembly type cantilever bridge maker according to claim 2, characterized in that: A fixed beam is provided at the bottom of the front C-shaped connecting beam, and the fixed beam is connected and fixed to the middle of the upper beam of the main truss.

4. The new type of main truss assembly type cantilever bridge maker according to claim 2, characterized in that: The upper beam of the main truss is hinged to a fixed seat by a pin; the fixed seat is connected and fixed to the bottom end of the liftable tie rod, and a first wedge block is provided on the top of the fixed seat, with the top surface of the first wedge block abutting against the lower surface of the bridge flange.

5. The new type of main truss assembly type cantilever bridge maker according to claim 2, characterized in that: The anti-jacking system includes a second wedge block, an anti-jacking cylinder, and a hinged anti-jacking wheel. The anti-jacking cylinder is fixed to the tail end of the upper beam of the main truss. The top of the piston rod of the anti-jacking cylinder is connected and fixed to the second wedge block, and the top surface of the second wedge block abuts against the lower surface of the bridge flange. The hinged anti-jacking wheel adopts a multi-degree-of-freedom movable hinge mechanism, and its roller abuts against the lower surface of the bridge flange.

6. The novel main truss prefabricated cantilever bridge-building machine according to claim 5, characterized in that: The second wedge block is equipped with a rear anchor hanger, the top of which is anchored to the bridge. The rear anchor hanger fixes the second wedge block to the lower part of the two flanges of the bridge.

7. The novel main truss prefabricated cantilever bridge-building machine according to claim 5, characterized in that: The anti-jacking system is also equipped with a horizontal bracing cylinder, which is horizontally positioned between the main truss upper beam and the bridge side wall for support; a horizontal tie rod is also installed between the main truss upper beam and the bridge side wall for locking.

8. The new type of main truss assembly type cantilever bridge maker according to claim 5, characterized in that: Below the articulated anti-top wheel, there is also a limiting wheel. The limiting wheel is laterally positioned between the main truss upper beam and the bridge side wall, and the roller in the limiting wheel abuts against the bridge side wall.

9. The new type of main truss assembly type cantilever bridge maker according to claim 1, characterized in that: An internal mold system is also provided, which includes an internal mold template truss, a guide beam, and sliding wheels. The guide beam is longitudinally arranged inside the bridge, and the sliding wheels are fixed to the bottom of the internal mold template truss and located on the guide beam. The internal mold template truss moves longitudinally along the guide beam under the action of the sliding wheels.

10. The new type of main truss assembly type cantilever bridge maker according to claim 9, characterized in that: The guide beam is fixed by suspension, and the top of the suspension is fixed to the beam surface of the bridge.

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