Double-main-beam ascending type movable formwork

Abstract

The utility model provides a double-girder ascending type movable formwork. The double-girder ascending type movable formwork comprises girders, a nose bridge, a suspension system, a rear longitudinal moving system, a walking mechanism, a front supporting leg, a middle supporting leg and a formwork system. The two groups of main beams are connected through the transverse connecting piece, and the two groups of nose bridges are connected with the main beams respectively; each group of suspension system comprises a cross beam, a suspended beam and a suspender, and the cross beam penetrates through the two groups of main beams; suspended beams are arranged on the two sides of the cross beam on the outer sides of the two main beams respectively and movably fixed to the cross beam, and the suspender penetrates through and is fixed to the cross beam and connected with the two ends of the suspended beams; the rear longitudinal moving system is located at the tail parts of the main beams, the two groups of walking mechanisms are respectively connected with one group of main beams, the two groups of middle supporting legs are respectively connected with one group of main beams, and the two groups of front supporting legs are respectively connected with one group of nose bridges. According to the utility model, the walking mode of the ascending type movable formwork and the formwork opening mode of the descending type movable formwork are combined, so that the continuous operation of bridge construction can be efficiently carried out in a smaller clearance space.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction machinery, and particularly relates to an up - traveling movable formwork with double main girders. Background Technique

[0002] The construction method of the movable formwork is also called the advanced support construction method, abbreviated as ASM in English. It was first used in the construction of the Kettinger Hang Bridge in Germany in 1955 and was recorded in history. With the main characteristics of convenient construction machinery and equipment, repeatable operation, high equipment reuse rate, prominent turnover efficiency, and low construction cost, it has been widely used in railway and highway projects.

[0003] Common movable formworks are divided into two forms: up - traveling movable formwork and down - traveling movable formwork. The conventional up - traveling type is a three - support single - main - girder load - bearing structure, and the height of the main girder is mostly between 4 and 7m. It uses hydraulic power to open the formwork and moves through the hole in a "bird" posture. The minimum net height required for the form - opening and hole - passing processes is 5 - 6m; while the down - traveling type is a three - support double - main - girder load - bearing structure, and the height of the main girder is mostly between 2 and 4m. It uses hydraulic transmission to horizontally move the formwork parallelly and moves through the hole in a "ship" posture. The minimum net height required for the form - opening and hole - passing processes is 3 - 6m.

[0004] However, due to the diverse topography and geomorphology in China, the actual bridge clearance varies greatly due to geological structures. In some areas, it is difficult to meet the requirements of form - opening and hole - passing of conventional movable formworks due to spatial geometric dimension problems. Generally, two methods are used during construction. One is to degrade the spatial dimensions of the original landform to meet the construction conditions; the other is to disassemble the movable formwork and reassemble it for use on the basis of an environment with its construction conditions. Both methods have the disadvantages of discontinuous construction, low use and turnover efficiency, idle mechanical equipment, and high costs, which are not conducive to the application of movable formwork construction. Therefore, it is changed to the support - casting process for implementation, resulting in a sharp increase in construction costs. Content of the Utility Model

[0005] Based on this, the utility model combines the traveling mode of the up - traveling movable formwork and the form - opening mode of the down - traveling movable formwork to provide an up - traveling movable formwork with double main girders, which can efficiently carry out continuous bridge construction in a smaller clearance space.

[0006] First aspect:

[0007] An up - traveling movable formwork with double main girders includes main girders, nose girders, suspension systems, rear longitudinal movement systems, traveling mechanisms, front legs, middle legs, and formwork systems;

[0008] There are two groups of the main girders, which are located on the same horizontal plane, arranged axially in parallel, and are connected by transverse connecting members. The main girders are provided with longitudinal movement tracks along the longitudinal direction;

[0009] There are two groups of the bridge noses, which are respectively connected to the main beams through the longitudinal movement tracks and can move along the longitudinal movement tracks;

[0010] There are several groups of the suspension systems. Each group of the suspension systems includes a cross beam, a hanging beam and a suspension rod located in the same cross section; the cross beam passes through and is fixed to the two groups of the main beams and is perpendicular to the main beams; the cross beam is respectively provided with the hanging beams at the outer positions of the two groups of the main beams. The hanging beam is in a "C" shape, and one end of which is movably fixed to the cross beam. The suspension rod passes through and is fixed to the cross beam and is connected to both ends of the hanging beam;

[0011] The rear longitudinal movement system is located at the tails of the two groups of the main beams and provides power for the longitudinal movement of the main beams;

[0012] There are two groups of the traveling mechanisms, which are respectively connected to one group of the main beams and can move longitudinally along the main beams;

[0013] There are two groups of the front outriggers, which are respectively connected to one group of the bridge noses and can move longitudinally along the bridge noses;

[0014] There are two groups of the middle outriggers, which are respectively connected to one group of the main beams and are located at the front ends of the main beams;

[0015] The formwork system includes an outer formwork, and the outer formwork is connected to the other end of the hanging beam.

[0016] The double-main-beam up-traveling movable formwork of the present utility model adopts double-beam connection and consolidation, and has a stable structure. The double-main-beam load-bearing system forms a spatial whole by means of a transverse connection system. The load-bearing system is converted from the form of a single main beam with three support points to the form of a main beam combination with six support points (rear longitudinal movement system, middle outriggers, front outriggers); the transverse connection system is arranged at equal intervals according to the geometric structure of the main beams to ensure the spatial structure size of the double main beams.

[0017] Meanwhile, combining the advantages of the up-traveling traveling and down-traveling form opening of the conventional movable formwork, the movable formwork opens the form by parallel transverse movement in a hydraulic transmission manner and assumes a "ship" posture. Through the double main beams and the support points, the top movement of the up-traveling main beam is adopted to pass through the hole, reducing the clearance requirements for form opening and passing through the hole, which can reach a minimum of 2 m, and broadening the application range.

[0018] Among them, the main beams and the bridge noses play two major roles of guiding and load-bearing during the construction process of the movable formwork; the suspension system is used for form opening and form closing operations during the construction process, and can also be adjusted according to the designed plane position, linear spacing, camber, elevation, etc. of the bridge; the rear longitudinal movement system provides longitudinal movement power and support for the movable formwork to pass through the hole; the traveling mechanism provides power and support for the movable formwork to longitudinally pass through the hole; the middle outriggers provide force support for the movable formwork; the front outriggers provide force support for the movable formwork; the formwork system is used for adjusting form opening and form closing during the construction process.

[0019] As a preferred solution, the main beam is divided into several sections, and high-strength bolts are used for connection between the sections. The main beam is relatively long, and being divided into several sections facilitates transportation and installation.

[0020] As a preferred solution, the bridge nose is divided into several sections, and high-strength bolts are used for connection between the sections. The bridge nose is relatively long, and being divided into several sections facilitates transportation and installation.

[0021] As a preferred solution, the cross beam or the hanging beam is divided into several sections and welded into a unit assembly using a box-shaped structure, which is convenient for disassembly and transportation.

[0022] As a preferred solution, a guiding device is provided on the cross beam, and the guiding device can guide the movement of the hanging beam. The guiding device facilitates the synchronous movement of the hanging beams on both sides of the same cross beam.

[0023] As a preferred solution, the rear longitudinal movement system includes a longitudinal movement propulsion frame and a transverse movement beam. The longitudinal movement propulsion frame is connected to two groups of the main beams, and the transverse movement beam is connected to the longitudinal movement propulsion frame. The rear longitudinal movement system provides power for the longitudinal and transverse movement of the equipment.

[0024] As a preferred solution, both the upper and lower sliding surfaces of the traveling mechanism are MGE sliding plates, and the MGE sliding plates can effectively reduce the sliding friction force of the traveling mechanism during construction operations.

[0025] As a preferred solution, the middle support leg is of a steel box girder structure and is connected to the main beam using high-strength bolts.

[0026] As a preferred solution, the front support leg is two groups of independent triangular trusses, which are respectively connected to one of the groups of the bridge nose. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a right view of a double-main-beam up-traveling moving formwork;

[0028] Figure 2 is a top view of a double-main-beam up-traveling moving formwork;

[0029] Figure 3 is a cross-sectional view of the suspension system and the formwork system of a double-main-beam up-traveling moving formwork in the closed mold state;

[0030] Figure 4 is a cross-sectional view of the suspension system and the formwork system of a double-main-beam up-traveling moving formwork in the open mold state;

[0031] Figure 5 is a cross-sectional view of the rear longitudinal movement system of a double-main-beam up-traveling moving formwork;

[0032] Figure 6It is a cross-sectional view of the traveling mechanism of an up-traveling movable formwork with double main girders;

[0033] Figure 7 It is a cross-sectional view of the middle support leg of an up-traveling movable formwork with double main girders;

[0034] Figure 8 It is a cross-sectional view of the front support leg of an up-traveling movable formwork with double main girders;

[0035] Wherein: 1 - main girder, 2 - nose beam, 3 - suspension system, 32 - cross beam, 34 - hanging beam, 36 - suspension rod, 4 - rear longitudinal movement system, 42 - longitudinal movement propulsion frame, 44 - transverse movement beam, 5 - traveling mechanism, 6 - middle support leg, 7 - front support leg, 8 - formwork system, 82 - side plate, 83 - bottom plate, 84 - support, 86 - inner formwork. Specific implementation manner

[0036] To further understand the present utility model, the present utility model will be described in detail below in conjunction with embodiments and the accompanying drawings. However, it should be noted that the embodiments and the drawings do not constitute a limitation to the scope of protection required by the present utility model.

[0037] Embodiment 1

[0038] An up-traveling movable formwork with double main girders includes a main girder 1, a nose beam 2, a cross beam 32, a hanging beam 34, a suspension rod 36, a rear longitudinal movement system 4, a traveling mechanism 5, a front support leg 6, a middle support leg 7, and a formwork system 8, and each device is provided with a hydraulic (mechanical) system.

[0039] As Figure 1-8 shown, there are two groups of main girders 1, which are located on the same horizontal plane, arranged axially in parallel, and connected by transverse connectors. The main girder 1 is provided with longitudinal movement tracks along the longitudinal direction;

[0040] There are two groups of nose beams 2, which are respectively connected to the main girder 1 through longitudinal movement tracks and can move along the longitudinal movement tracks. The main girder 1 and the nose beam 2 form a double-beam structure;

[0041] There are several groups of suspension systems 3. Each group of the suspension system includes a cross beam 32, a hanging beam 34, and a suspension rod 36 located in the same cross section; the cross beam 32 passes through and is fixed to the two groups of main girders 1 and is perpendicular to the main girder 1; the cross beam 32 is respectively provided with hanging beams 34 at the outer positions of the two groups of main girders 1. The hanging beam 34 is in a "C" shape, and one end of which is movably fixed on the cross beam 32 and can move horizontally along the cross beam 32 through a hydraulic (mechanical) system; the suspension rod 36 passes through and is fixed to the cross beam 32 and is connected to both ends of the hanging beam 34;

[0042] The rear longitudinal movement system 4 is located at the tail of the main girder 1 and includes a longitudinal movement propulsion frame 42 and a transverse movement beam 44. The longitudinal movement propulsion frame 42 is fixedly connected to the two groups of main girders 1 by high-strength bolts, providing power and support for the longitudinal movement of the main girder. The transverse movement beam 44 is fixedly connected to the longitudinal movement propulsion frame 42;

[0043] There are two groups of traveling mechanisms 5, which are respectively connected to one group of the main girders 1 and can move longitudinally along the main girder 1;

[0044] There are two groups of front outriggers 7, which are respectively connected to one group of the nose beams 2, located at the front end of the nose beam 2 and can move longitudinally along the nose beam 2;

[0045] There are two groups of middle outriggers 6, which are respectively connected to one group of the main girders 1 and are located at the front end of the main girder 1;

[0046] The formwork system 8 includes an external formwork and an internal formwork 86. The external formwork includes side plates 82, a bottom plate 83 and a support 84; the side plates 82 are fixed to the hanging beam 34 through the support 84, and the bottom plate 83 is directly fixed to the other end of the hanging beam 34; the internal formwork 86 is manually assembled by small steel forms and is arranged inside the box girder.

[0047] Among them:

[0048] Main girder 1

[0049] The main girder 1 also includes upper and lower flanges and a web. The main girder is a steel box girder with a cross-sectional size of 1480 mm × 2860 mm, the thickness of the upper and lower flanges is 20 mm, and the thickness of the web is 12 - 16 mm. The length is about 38.82 m, and the structure is segmented into 3 sections, and the joints are connected by high-strength bolts.

[0050] Nose beam 2

[0051] The nose beam 2 is arranged at the front end of the main girder, with a length of 32 m. The structure is segmented into 3 sections, and the joints are connected by high-strength bolts. The nose beam provides a moving track for the front outrigger 7 and plays two major roles of guiding and bearing during the construction of the moving formwork.

[0052] Suspension system 3

[0053] The suspension system also includes mechanical devices, guiding devices, etc. Among them, the cross beam 32 and the hanging beam 34 are welded into units and assembled using a box-shaped structure. The guiding device is arranged on the cross beam 32. The mechanical device and the guiding device facilitate the opening and closing operations of the hanging beam 34, and at the same time can be adjusted for the designed plane position, linear spacing, camber, elevation, etc. of the bridge.

[0054] Rear longitudinal movement system 4

[0055] The rear longitudinal movement system 4 is connected to the contact surfaces of the two groups of main girders 1 by high-strength bolts. The rear longitudinal movement system also includes rails, transverse movement cushion beams, longitudinal movement hydraulic cylinders, transverse movement hydraulic cylinders, etc.; the longitudinal movement hydraulic cylinders provide longitudinal movement power and support when the equipment passes through the hole, and the equipment transverse movement is realized through the transverse movement hydraulic cylinders, transverse movement beams 44 and transverse movement cushion beams.

[0056] Travel mechanism 5

[0057] The main function of the travel mechanism 5 is to provide power and support for the equipment when it longitudinally moves through the hole. Each group of travel mechanisms is equipped with a set of longitudinal movement hydraulic cylinders.

[0058] The travel mechanism is provided with upper and lower sliding surfaces, both of which are MGE slide plates to reduce the friction force between the main girder 1 and the bridge during operation. The maximum stroke of the longitudinal movement hydraulic cylinder is 900 mm (if necessary, the push frame pin can also be inserted into the pin hole in the reverse direction to achieve reverse propulsion).

[0059] Middle support leg 6

[0060] The middle support leg 6 is of steel box girder structure and is connected to the contact surface of the main girder 1 by high-strength bolts.

[0061] Front support leg 7

[0062] The front support leg 7 is two groups of independent triangular trusses, which are connected to the bridge nose 2 by hanging wheels, so that it can longitudinally move on the bridge nose 2. The front support leg 7 is also provided with a hydraulic system power system and a guiding device to realize actions such as opening, closing, and longitudinal movement.

[0063] Embodiment 2

[0064] The application of a double-main girder upward mobile formwork includes the following steps:

[0065] S1 Formwork debugging and preloading: When the mobile formwork is first assembled and used, the preloading load is 1.2 times the maximum construction load, and the remaining preloading load is 1.1 times the maximum construction load; the preloading is carried out by the method of precast concrete blocks + full-box water storage (the length, width, and height of the precast block specifications are: 1.0×0.8×0.9 m, and the weight is about 2.0 t). Reflective patches are symmetrically arranged on both sides of each group of main girders 1. The reflective patches are arranged at the rear longitudinal movement system support points, middle support leg support points, 1 / 4 span, 1 / 2 span, 3 / 4 span of the main girder 1. There are a total of 20 reflective patches for the two groups of main girders 1.

[0066] When the movable formwork is assembled and used for the first time, the preloading process is carried out by the three-level loading method of 60%, 100%, and 120% of the maximum load. For the remaining preloading processes, the three-level loading method of 60%, 100%, and 110% of the maximum load is used. During the loading process, hold the load for 2 hours for each level of loading. After the loading is completed, observe once every 1 hour. After all the loads are applied, hold the load for 8 hours and observe once every 2 hours. If the settlement difference between the last two observations is not greater than 2 mm, it is considered stable and unloading can be carried out.

[0067] S2 Construction of the first-span box girder: Control the rear longitudinal movement system 4 to push the main girder 1 to advance longitudinally, so that the movable formwork reaches the predetermined position for beam fabrication. The middle support leg 6 is supported on the beam surface of the front pier top. Control the hanging beam 34 to symmetrically close the form along the cross beam 32 through the hydraulic system.

[0068] S3 Pre-camber adjustment: Set the pre-camber, install the formwork system 8 and the suspender 36, and carry out concrete pouring.

[0069] S4 Forward movement of the front support leg by one span: Control the lifting of the front support leg 7, control the longitudinal movement of the nose beam 2, and then control the front support leg 7 to slide to the next span and support on the beam surface of the front pier top.

[0070] S5 Opening the form: Remove the hanging suspender 36, control the hanging beam 34 to symmetrically open the form along the cross beam 32 through the hydraulic system. The maximum unilateral opening distance is 5.0 m (try to synchronize the opening and closing of the two-side hanging beams 34 as much as possible, and the maximum deviation is less than 0.5 m), and remove the formwork system 8. At this time, the rear longitudinal movement system 4 and the middle support leg 6 are stressed.

[0071] S6 Forward movement of the double main girders by one span: Control the traveling mechanism 5 to move to a position 1 - 2 m in front of the middle support leg 6 and support on the beam surface of the pier top. Then control the lifting of the middle support leg 6, control the rear longitudinal movement system 4 to move forward by one span, and move to a position 1 - 2 m in front of the traveling mechanism 5, so that the main girder 1 moves forward by one span to reach the predetermined beam fabrication position, and the middle support leg 6 is supported on the beam surface of the front pier top. At this time, the rear longitudinal movement system 4, the traveling mechanism 5, the middle support leg 6, and the front support leg 7 are stressed.

[0072] S7 Closing the form: Control the hanging beam 34 to symmetrically close the form along the cross beam 32 through the hydraulic system (try to synchronize the opening and closing of the two-side hanging beams 34 as much as possible, and the maximum deviation is less than 0.5 m).

[0073] Repeat steps S3 - S7 until the construction is completed.

[0074] The above embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A double-girder up-traveling movable formwork, characterized in that It includes main girders, bridge noses, suspension systems, rear longitudinal movement systems, traveling mechanisms, front outriggers, middle outriggers, and formwork systems; There are two groups of the main girders, which are located on the same horizontal plane, arranged in parallel axially, and connected by transverse connectors. The main girders are provided with longitudinal movement tracks along the longitudinal direction; There are two groups of the bridge noses, which are respectively connected to the main girders through the longitudinal movement tracks and can move along the longitudinal movement tracks; There are several groups of the suspension systems. Each group of the suspension systems includes a cross beam, a hanging beam, and a suspension rod located in the same cross section. The cross beam passes through and is fixed to the two groups of the main girders and is perpendicular to the main girders. The cross beam is respectively provided with the hanging beams at the outer positions of the two groups of the main girders. The hanging beam is in a "C" shape, and one end of which is movably fixed to the cross beam. The suspension rod passes through and is fixed to the cross beam and is connected to both ends of the hanging beam; The rear longitudinal movement system is located at the tails of the two groups of the main girders and provides power for the longitudinal movement of the main girders; There are two groups of the traveling mechanisms, which are respectively connected to one group of the main girders and can move longitudinally along the main girders; There are two groups of the front outriggers, which are respectively connected to one group of the bridge noses and can move longitudinally along the bridge noses; There are two groups of the middle outriggers, which are respectively connected to one group of the main girders and are located at the front ends of the main girders; The formwork system includes an outer formwork, and the outer formwork is connected to the other end of the hanging beam.

2. The double-girder up-traveling movable formwork according to claim 1, characterized in that, The main girders are divided into several sections, and the sections are connected by high-strength bolts.

3. The double-girder up-traveling movable formwork according to claim 1, characterized in that The bridge noses are divided into several sections, and the sections are connected by high-strength bolts.

4. The double-girder up-traveling movable formwork according to claim 1, wherein The cross beam or the hanging beam is divided into several sections and is welded into a unit assembly by using a box-shaped structure.

5. The double-main girder up-traveling movable formwork according to claim 1, characterized in that, The cross beam is provided with a guiding device, and the guiding device can guide the movement of the hanging beam.

6. The double-girder up-traveling movable formwork according to claim 1, wherein, The rear longitudinal movement system includes a longitudinal movement propulsion frame and a transverse movement beam. The longitudinal movement propulsion frame is connected to the two groups of the main girders, and the transverse movement beam is connected to the longitudinal movement propulsion frame.

7. The double-girder up-traveling movable formwork according to claim 1, wherein, The upper and lower sliding surfaces of the traveling mechanism are both MGE sliding plates.

8. The double-girder up-traveling movable formwork according to claim 1, wherein, The middle outrigger is of a steel box girder structure.

9. The double-girder up-traveling movable formwork according to claim 1, characterized in that, The front outrigger is two groups of independent triangular trusses, which are respectively connected to one group of the bridge noses.

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