A method of bottom side form launching of a bridge deck crane retrofitted to a bridge machine

Abstract

The application provides a bottom-side mold sliding method of a bridge deck crane of a bridge builder, wherein the bottom mold and the side mold are synchronously walked with the bridge builder to a certain distance from the steel box beam hoisting range, the bottom mold and the side mold are temporarily locked on the cast box beam, the steel box beam is hoisted and fixed on the cast box beam, the electric hoist is installed on the steel box beam, the bottom mold is lowered, the bottom mold is moved forward to the bottom mold installation position through the electric hoist traction, the bottom mold is anchored on the steel box beam and the cast box beam, the outer mold stringer is slid forward, the suspender between the outer mold stringer and the bridge builder is installed, two groups of rollers are installed on the outer mold stringer, the side mold body is lowered to the rollers with the steel strand, the side mold is slid forward through the electric hoist traction, and the side mold is anchored on the cast box beam and the steel box beam after the side mold is pulled to the specified position. The bottom-side mold sliding method can ensure that the hoisting of the steel box beam is not affected, and the bottom-side mold can be safely and quickly slid to the position.

Description

Technical Field

[0001] This invention relates to the technical field of bridge-building machines for the construction of steel-concrete sections of cable-stayed bridge steel box girders, and particularly to a method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine. Background Technology

[0002] With the rapid development of high-speed railway construction, long-span bridges are accounting for an increasingly larger proportion of high-speed railway construction, and cantilever bridge-building machines play a crucial role in the construction of long-span bridges. The steel box girder of a steel-concrete cable-stayed bridge is a steel-concrete structure composed of steel beams and concrete. The steel beams are manufactured in the factory and transported to the bridge site, where they are lifted into place by large cranes. Due to the large size and weight of the steel beams, the high lifting height, and the numerous and narrow navigation channel locks, suitable bridge deck cranes and large floating cranes are required, resulting in high costs and long construction periods.

[0003] Currently, upgrading the existing bridge-building machine into a bridge deck crane is an option. This involves installing a hoisting system above the main beam of the bridge-building machine, using this system to lift the steel box girder into place. However, due to the limitations of the steel box girder hoisting (i.e., the front crossbeam of the bottom formwork does not encroach on the steel girder hoisting range), the bottom hanging basket of the modified bridge-building machine cannot move into position with it in one go. If the steel formwork is dismantled and converted into wooden formwork, or if the steel formwork is removed and reinstalled, it will consume a lot of manpower and resources, have a long processing cycle, seriously affect the construction period of the steel girder and other processes, have low work efficiency, very high costs, and high safety risks. Summary of the Invention

[0004] This invention provides a method for sliding the bottom and side forms of a bridge deck crane modified from a bridge-building machine. After the bottom and side forms are moved synchronously with the bridge-building machine in the first shift, the bottom and side forms are then pulled by an electric hoist installed on the positioned steel box girder for a second sliding. This method ensures that the hoisting of the steel box girder is not affected, and at the same time, the bottom and side forms can be safely and quickly slid into place. It is convenient for construction and saves manpower and material resources.

[0005] The technical solution adopted to achieve the above-mentioned objectives of this invention is as follows:

[0006] A method for sliding the bottom and side formwork of a bridge deck crane modified from a bridge-building machine, wherein the main body of the bridge deck crane modified from the bridge-building machine is composed of a bridge-building mechanism, a hoisting system is installed above the main beam of the bridge-building machine, the side formwork includes a side formwork body and an outer formwork longitudinal beam, the side formwork body is connected to the outer formwork longitudinal beam, and the bottom formwork and the outer formwork longitudinal beam are suspended from the cast box girder and the bridge-building machine. The method for sliding the bottom and side formwork includes the following steps:

[0007] (1) After the pouring construction is completed, remove the suspenders between the bottom formwork and the side formwork and the poured box girder. The bottom formwork and the side formwork move synchronously with the bridge building machine to a certain distance from the steel box girder hoisting range. The bottom formwork and the side formwork are temporarily locked to the poured box girder by steel strands. Then remove the suspenders between the bottom formwork and the side formwork and the bridge building machine.

[0008] (2) The bridge-building machine continues to travel until the hoisting system is located within the hoisting range of the steel box girder. The hoisting system hoists the steel box girder and positions it. Then, the steel box girder is positioned and fixed onto the already cast box girder.

[0009] (3) Install electric hoists symmetrically on both sides of the flange plate of the steel box girder, and connect the electric hoists to the front of the bottom formwork. Lower the steel strand temporarily locked on the bottom formwork so that the bottom formwork is lowered synchronously with the steel strand for a certain distance. Use the electric hoist to pull the bottom formwork forward to the bottom formwork installation position, and anchor the front and rear parts of the bottom formwork to the steel box girder and the cast box girder respectively, and release the temporary locking of the bottom formwork.

[0010] (4) Slide the outer formwork longitudinal beam forward to be flush with the bridge building machine, install the suspenders between the outer formwork longitudinal beam and the bridge building machine, install two sets of rollers on the outer formwork longitudinal beam, lower the steel strand temporarily locked on the side formwork, so that the main body of the side formwork is lowered to the rollers along with the steel strands, and pull the side formwork forward by the electric hoists on both sides of the steel box girder flange. After the side formwork is pulled to the designated position, anchor the side formwork to the cast box girder and steel box girder, and release the temporary locking of the side formwork.

[0011] After the bottom formwork and side formwork are completed in step (1) and move synchronously with the bridge-building machine, the bottom formwork and side formwork do not intrude into the hoisting range of the steel box girder.

[0012] The bottom formwork and side formwork move synchronously with the bridge-building machine to a position 50cm away from the steel box girder hoisting range.

[0013] In step (1), the four corners of the bottom formwork are temporarily locked to the cast box girder by steel strands, and each locking point is fixed by three steel strands.

[0014] In step (1), the front and rear corners of the side formwork flange are temporarily locked to the cast box girder by steel strands. Each locking point is fixed by two steel strands.

[0015] In step (2), the steel box girder and the cast box girder are positioned and fixed by the upper positioning frame and the lower positioning frame erected between them.

[0016] In step (4), after the side formwork is pulled to the designated position, it is anchored on the upper positioning frame connecting the cast box girder and the steel box girder.

[0017] Both the upper and lower positioning frames are composed of four sets of double H-beams. Steel plates are pre-embedded at corresponding positions on the cast-in-place box girder. The two ends of the double H-beams are fixed to the steel plates and the steel box girder on the cast-in-place box girder, respectively.

[0018] In step (3), after the bottom formwork is moved to the bottom formwork installation position, the middle part of the bottom formwork is fixed to the pre-embedded steel plate at the web of the cast box girder, and then the temporary locking of the bottom formwork is released.

[0019] In step (3), the front part of the bottom formwork is connected to the steel box girder through the bottom formwork front sling, and the rear part of the bottom formwork is anchored to the cast box girder through the bottom formwork rear anchor system.

[0020] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0021] 1. In the method for sliding the bottom and side formwork of the bridge deck crane modified by the bridge building machine provided by the present invention, the bottom and side formwork are moved synchronously with the bridge building machine once, and then the bottom and side formwork are pulled into place a second time by the electric hoist installed on the positioned steel box girder. The bottom and side formwork are subjected to uniform force, which can ensure that the hoisting of the steel box girder is not affected, and at the same time, the bottom and side formwork can be safely and quickly slid into place. The construction is convenient and saves manpower and material resources.

[0022] 2. In this invention, after the steel box girder is hoisted into place, it is positioned and fixed by the upper positioning frame and the lower positioning frame. Both the upper positioning frame and the lower positioning frame are made of double H-beams to ensure the safety and stability of the steel box girder after hoisting into place, while also ensuring the stability of the bottom side formwork sliding. It is convenient to use local materials and construction.

[0023] 3. In this invention, after the bottom formwork slides into place, the front, middle and rear crossbeams of the bottom formwork are anchored to the positioned steel box girder and the cast-in-place box girder, respectively, to ensure the stability of the bottom formwork and meet the stress requirements.

[0024] 4. In this invention, during the secondary sliding of the side mold, the entire side mold is supported on the rollers to ensure the stability and safety of the side mold sliding. Attached Figure Description

[0025] Figure 1 This is a side view showing the bottom mold and side mold temporarily locked in this invention;

[0026] Figure 2 This is a schematic diagram of the hoisting and positioning of the steel box girder and the lowering of the bottom formwork in this invention;

[0027] Figure 3 This is a schematic diagram of the installation of the bottom mold when it is moved to the installation position in this invention;

[0028] Figure 4 This is a side view of the secondary sliding of the side mold in this invention;

[0029] Figure 5This is a front view of the secondary sliding of the side mold in this invention;

[0030] Figure 6 This is a schematic diagram of the side mold sliding into position in this invention;

[0031] In the diagram: 1-cast box girder, 2-bridge building machine, 3-bottom formwork, 4-side formwork, 401-outer formwork longitudinal beam, 5-lifting system, 6-steel strand, 7-upper positioning frame, 8-lower positioning frame, 9-steel plate, 10-precision rolled threaded steel, 11-electric hoist, 12-bottom formwork front lifting strap, 13-bottom formwork rear anchoring system, 14-lifting rod, 15-roller. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] During bridge construction, the bottom formwork 3 and side formwork 4 are suspended on the already cast box girder 1 and the bridge construction machine 2. When the bridge construction machine moves, the suspension rods between the bottom formwork and side formwork and the cast box girder are removed, allowing the bottom formwork and side formwork to move synchronously with the bridge construction machine. In this embodiment, the side formwork includes a side formwork body and an outer formwork longitudinal beam 401. The side formwork body is connected to the outer formwork longitudinal beam, which is suspended on the cast box girder and the bridge construction machine, thus allowing the side formwork to be suspended as a whole on the cast box girder and the bridge construction machine. In this invention, the bridge deck crane body modified from the bridge construction machine is composed of a bridge construction machine. A hoisting system 5 is installed above the main beam of the bridge construction machine. The steel box girder is hoisted into position using the hoisting system. To avoid the bottom formwork and side formwork affecting the hoisting of the steel box girder, the bottom formwork and side formwork need to move separately to the bottom of the bridge construction machine after the steel box girder is hoisted into position, connect with the bridge construction machine, and carry out the casting of the box girder. The bridge deck crane modified from the bridge-building machine is existing technology, and its structure will not be described in detail here.

[0034] The method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine provided by this invention includes the following steps:

[0035] (1) After the pouring construction is completed, remove the suspension rods between the bottom formwork and side formwork (outer formwork longitudinal beam) and the poured box girder. The bottom formwork and side formwork move synchronously with the bridge-building machine to a certain distance from the steel box girder hoisting range, and temporarily lock the bottom formwork and side formwork to the poured box girder using steel strands 6. Figure 1 As shown, the suspension rods between the bottom formwork and the side formwork (outer formwork longitudinal beams) and the bridge-building machine are then removed;

[0036] Specifically, after the bottom formwork and side formwork are moved synchronously with the bridge-building machine, they do not encroach on the hoisting range of the steel box girder; preferably, the bottom formwork and side formwork are moved synchronously with the bridge-building machine to a distance of 50cm from the hoisting range of the steel box girder, that is, after the steel box girder is hoisted into place, the distance between the bottom formwork and the side formwork is 50cm.

[0037] Specifically, locking holes are pre-drilled at all four corners of the bottom formwork. Steel strands are passed through these holes to temporarily lock the four corners of the bottom formwork to the bottom plate of the already cast box girder. Three steel strands are used for fixing each corner. Locking holes are also pre-drilled at the front and rear corners of the side formwork flanges. Steel strands are passed through these holes to temporarily lock the four corners of the side formwork flanges to the top plate of the already cast box girder. Two steel strands are used for fixing each corner. See [link to details]. Figure 1 .

[0038] During concrete pouring, temporary locking holes for the bottom formwork and side formwork, as well as holes for the bottom formwork rear anchor system (see below), can be reserved at the designed positions of the flange plates of the bottom and top slabs of the concrete main beam.

[0039] (2) The bridge-building machine continues to travel until the hoisting system is exactly within the hoisting range of the steel box girder. The hoisting system then hoists and positions the steel box girder, and finally fixes it onto the already cast box girder. See Figure 2 ;

[0040] Specifically, the steel box girder and the cast-in-place box girder are positioned and fixed by an upper positioning frame 7 and a lower positioning frame 8 erected between them. Further, the upper positioning frame is horizontally fixed to the top surface of the cast-in-place box girder and the upper surface of the steel box girder, and the lower positioning frame is horizontally fixed to the bottom surface of the cast-in-place box girder and the upper surface of the steel box girder. Preferably, both the upper and lower positioning frames consist of four sets of double-section H-beams. Steel plates 9 are pre-embedded in the cast-in-place box girder at corresponding positions. The two ends of the double-section H-beams are fixed to the steel plates and the steel box girder on the cast-in-place box girder, respectively. Further, the double-section H-beams are locked to the steel plates and the steel box girder by precision-rolled threaded steel bars 10 (with matching nuts and washers).

[0041] (3) Install electric hoists 11 symmetrically on both sides of the flange plate of the steel box girder, and connect the electric hoists to the front of the bottom formwork. Slowly lower the steel strands temporarily locked on the bottom formwork so that the bottom formwork descends a certain distance synchronously with the steel strands. See Figure 2 The bottom mold is moved forward to its installation position by an electric hoist. Figure 3 As shown, the front and rear parts of the bottom formwork are anchored to the steel box girder and the already cast box girder respectively, and the temporary locking of the bottom formwork is released, thereby completing the secondary movement of the bottom formwork;

[0042] Specifically, a 10t electric hoist is installed on each side of the flange of the steel box girder and connected to the front sides of the bottom formwork respectively.

[0043] Specifically, the height to which the steel strand descends is consistent with the distance the bottom formwork moves forward. Therefore, the distance the bottom formwork needs to move forward can be calculated first, and the height to which the steel strand descends can be calculated based on this distance.

[0044] Specifically, the front crossbeam of the bottom formwork is connected to the steel box girder via the front lifting strap 12, and the rear crossbeam of the bottom formwork is anchored to the cast-in-place box girder via the rear anchor system 13. In this embodiment, after the bottom formwork is moved to the installation position, the middle part of the bottom formwork (the middle crossbeam) is fixed to the embedded steel plate at the web of the cast-in-place box girder using precision-rolled threaded steel bars, and then the temporary locking of the bottom formwork is released to further ensure the stability of the bottom formwork installation.

[0045] (4) Slide the outer formwork longitudinal beam forward until it is flush with the bridge-building machine, and install the suspension rod 14 between the outer formwork longitudinal beam and the bridge-building machine, such as Figure 4 and Figure 5 As shown, two sets of rollers 15 are installed on the outer formwork longitudinal beam. The steel strands temporarily locked on the side formwork are lowered, allowing the main body of the side formwork to descend onto the rollers along with the steel strands. The side formwork is then pulled forward by electric hoists on both sides of the steel box girder flange. After the side formwork is pulled to the designated position, it is anchored to the already poured box girder and steel box girder. The temporary locking of the side formwork is then released, thus completing the secondary movement of the side formwork. Figure 6 As shown. Specifically, after the side formwork is pulled to the designated position, it is anchored to the upper positioning frame connecting the cast-in-place box girder and the steel box girder.

[0046] The bottom and side formwork sliding method of the bridge deck crane modified by the present invention can ensure the safety of bottom and side formwork sliding, improve work efficiency, and ensure safety and quality in the concrete pouring process.

Claims

1. A method for sliding the bottom and side formwork of a bridge deck crane modified from a bridge-building machine, wherein the main body of the bridge deck crane modified from the bridge-building machine is composed of a bridge-building mechanism, a hoisting system is installed above the main beam of the bridge-building machine, the side formwork includes a side formwork body and an outer formwork longitudinal beam, the side formwork body is connected to the outer formwork longitudinal beam, and the bottom formwork and the outer formwork longitudinal beam are suspended on the cast-in-place box girder and the bridge-building machine, characterized in that: The bottom mold sliding method includes the following steps: (1) After the pouring construction is completed, remove the suspenders between the bottom formwork and the side formwork and the poured box girder. The bottom formwork and the side formwork move synchronously with the bridge building machine to a certain distance from the steel box girder hoisting range. The bottom formwork and the side formwork are temporarily locked to the poured box girder by steel strands. Then remove the suspenders between the bottom formwork and the side formwork and the bridge building machine. (2) The bridge-building machine continues to travel until the hoisting system is located within the hoisting range of the steel box girder. The hoisting system hoists the steel box girder and positions it. Then, the steel box girder is positioned and fixed onto the already cast box girder. (3) Install electric hoists symmetrically on both sides of the flange plate of the steel box girder, and connect the electric hoists to the front of the bottom formwork. Lower the steel strand temporarily locked on the bottom formwork so that the bottom formwork is lowered synchronously with the steel strand for a certain distance. Use the electric hoist to pull the bottom formwork forward to the bottom formwork installation position, and anchor the front and rear parts of the bottom formwork to the steel box girder and the cast box girder respectively, and release the temporary locking of the bottom formwork. (4) Slide the outer formwork longitudinal beam forward to be flush with the bridge building machine, install the suspenders between the outer formwork longitudinal beam and the bridge building machine, install two sets of rollers on the outer formwork longitudinal beam, lower the steel strand temporarily locked on the side formwork, so that the main body of the side formwork is lowered to the rollers along with the steel strands, and pull the side formwork forward by the electric hoists on both sides of the steel box girder flange. After the side formwork is pulled to the designated position, anchor the side formwork to the cast box girder and steel box girder, and release the temporary locking of the side formwork.

2. The method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine according to claim 1, characterized in that: After the bottom formwork and side formwork are completed in step (1) and move synchronously with the bridge-building machine, the bottom formwork and side formwork do not intrude into the hoisting range of the steel box girder.

3. The method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine according to claim 2, characterized in that: The bottom formwork and side formwork move synchronously with the bridge-building machine to a position 50cm away from the steel box girder hoisting range.

4. The method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine according to claim 1, characterized in that: In step (1), the four corners of the bottom formwork are temporarily locked to the cast box girder by steel strands, and each locking point is fixed by three steel strands.

5. The method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine according to claim 1, characterized in that: In step (1), the front and rear corners of the side formwork flange are temporarily locked to the cast box girder by steel strands. Each locking point is fixed by two steel strands.

6. The method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine according to claim 1, characterized in that: In step (2), the steel box girder and the cast box girder are positioned and fixed by the upper positioning frame and the lower positioning frame erected between them.

7. The method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine according to claim 6, characterized in that: In step (4), after the side formwork is pulled to the designated position, it is anchored on the upper positioning frame connecting the cast box girder and the steel box girder.

8. The method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine according to claim 6, characterized in that: Both the upper and lower positioning frames are composed of four sets of double H-beams. Steel plates are pre-embedded at corresponding positions on the cast-in-place box girder. The two ends of the double H-beams are fixed to the steel plates and the steel box girder on the cast-in-place box girder, respectively.

9. The method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine according to claim 1, characterized in that: In step (3), after the bottom formwork is moved to the bottom formwork installation position, the middle part of the bottom formwork is fixed to the pre-embedded steel plate at the web of the cast box girder, and then the temporary locking of the bottom formwork is released.

10. The method for sliding the bottom side formwork of a bridge deck crane modified from a bridge-building machine according to claim 1, characterized in that: In step (3), the front part of the bottom formwork is connected to the steel box girder through the bottom formwork front sling, and the rear part of the bottom formwork is anchored to the cast box girder through the bottom formwork rear anchor system.

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