Prefabricated box girder inner formwork

Abstract

The utility model discloses a prefabricated box girder inner formwork which is characterized in that slot openings are formed in the two ends of a supporting plate, one ends of two inner formwork top plates are inserted into the slot openings respectively, the upper ends of two inner formwork side plates are movably hinged to the outer ends of the two inner formwork top plates respectively, and the two ends of an inner formwork bottom plate are in lap joint with the lower ends of the two inner formwork side plates respectively; a first pushing oil cylinder is fixedly installed at the bottom of the supporting box, the lower end of the first pushing oil cylinder is slidably installed on the inner mold bottom plate, and transverse moving mechanisms are installed at the two ends of the upper portion of the supporting box and used for driving the inner mold top plate to transversely move. The second pushing oil cylinder can push the L-shaped sliding plate to move, so that transverse movement of the inner mold top plate is achieved, then the hydraulic rod is started to deflect the inner mold side plate, demolding of the inner mold side plate is facilitated, the inner mold top plate descends through the first pushing oil cylinder to conduct demolding, finally the inner mold bottom plate is taken out, demolding work of the box girder inner mold can be completed, the whole process is smooth, and the demolding efficiency is improved. Damage to the box girder is reduced, and meanwhile the demolding efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of box girder formwork technology, and more specifically, to an inner formwork for precast box girders. Background Technology

[0002] Box girders are a type of beam used in bridge engineering. They are hollow inside with flanges on both sides of the upper part, resembling a box, hence the name. They are available in single-box and multi-box structures. Reinforced concrete box girders can be divided into precast box girders and cast-in-place box girders from a manufacturing perspective. Precast box girders, fabricated on an independent site and then erected using a bridge-building machine after the substructure is completed, can accelerate the project and save time. However, transportation is difficult and expensive, so they are mostly used for small bridges. Cast-in-place box girders, on the other hand, are mostly used for large continuous bridges.

[0003] After the box girder is formed, it needs to be demolded and the inner mold removed. However, during the demolding process, the inner mold is extremely heavy and difficult to remove, which not only consumes a lot of labor but also reduces production efficiency and affects the construction progress. Existing technologies use hydraulic cylinders to control the folding of the inner mold to facilitate demolding. However, since there are corners on both sides inside the box girder, if the folding of the inner mold side plates is directly controlled, the inner mold side plates will hit the box girder, causing damage to the box girder. At the same time, it also affects the smoothness of the folding process of the inner mold, resulting in the demolding efficiency not being improved. Summary of the Invention

[0004] The purpose of this utility model is to provide a precast box girder inner formwork that can be folded and will not bump the box girder.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a precast box girder inner formwork, including an inner box girder formwork, and also including a support plate, a support box and two hydraulic rods;

[0006] The box girder inner mold includes an inner mold bottom plate, two inner mold top plates and two inner mold side plates. The support plate has slots at both ends. One end of each of the two inner mold top plates is inserted into the slot. The upper ends of the two inner mold side plates are movably hinged to the outer ends of the two inner mold top plates. The two ends of the inner mold bottom plate overlap with the lower ends of the two inner mold side plates.

[0007] The bottom of the support box is fixedly installed with a first push cylinder. The lower end of the first push cylinder is slidably installed on the inner mold base plate. One end of the two hydraulic rods is movably hinged to both sides of the support box, and the other end of the two hydraulic rods is movably hinged to the inner side of the inner mold side plate at the corresponding position.

[0008] Both ends of the upper part of the support box are equipped with a transverse movement mechanism, which is used to drive the inner mold top plate to move laterally.

[0009] Preferably, the transverse movement mechanism includes a second push cylinder, a pull rod, and an L-shaped slide plate. The two second push cylinders are respectively fixedly installed on both sides of the support box. A sliding groove is opened on the top of the support box. The two L-shaped slide plates are slidably installed in the sliding groove. The pull rod is fixedly installed on the upper end of the L-shaped slide plate, and the upper end of the pull rod is fixedly connected to the corresponding inner mold top plate. The piston shaft of the second push cylinder is inserted into the support box and fixedly connected to the corresponding L-shaped slide plate.

[0010] Preferably, a slide rail is fixedly installed on the upper part of the pallet along the length direction, and the lower end of the first push cylinder is slidably connected to the slide rail via a slider.

[0011] Preferably, both ends of the inner mold base plate are provided with an integrally formed upward protruding stop block, and the lower end of the inner mold side plate overlaps with the inner side of the corresponding stop block.

[0012] Preferably, both the first and second push cylinders are controlled to start and stop via a remote control switch.

[0013] Preferably, a support column is fixedly welded to the upper part of the support box, and the upper end of the support column is fixedly connected to the bottom of the tray.

[0014] Compared with the prior art, the advantages of this utility model are:

[0015] When demolding is required, the second jacking cylinder can push the L-shaped sliding plate to move, thereby realizing the lateral movement of the inner mold top plate. Then, the hydraulic rod is activated to deflect the inner mold side plate. At this time, the inner mold side plate will not hit the box girder, thus facilitating the demolding of the inner mold side plate. The inner mold top plate is lowered by the first jacking cylinder for demolding. Finally, the inner mold bottom plate is removed, thus completing the demolding of the box girder inner mold. The whole process is relatively smooth, reducing damage to the box girder and improving demolding efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural diagram of an internal formwork for a precast box girder according to this utility model;

[0018] Figure 2 This is a cross-sectional view of the support box of this utility model.

[0019] In the diagram: 1. Box girder inner mold; 11. Inner mold top plate; 12. Inner mold side plate; 13. Inner mold bottom plate; 2. Support plate; 21. Slot opening; 3. Support box; 31. Slide groove opening; 4. First jacking cylinder; 5. Slide rail; 6. Lateral movement mechanism; 61. Second jacking cylinder; 62. Tie rod; 63. L-shaped sliding plate; 7. Hydraulic rod. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0021] See Figures 1-2 As shown, this utility model provides a precast box girder inner formwork, including a box girder inner formwork 1, and also includes a support plate 2, a support box 3 and two hydraulic rods 7;

[0022] The box girder inner mold 1 includes an inner mold bottom plate 13, two inner mold top plates 11 and two inner mold side plates 12. The support plate 2 has slots 12 at both ends. One end of each of the two inner mold top plates 11 is inserted into the slot 12. The upper ends of the two inner mold side plates 12 are movably hinged to the outer ends of the two inner mold top plates 11. The two ends of the inner mold bottom plate 13 overlap with the lower ends of the two inner mold side plates 12.

[0023] The bottom of the support box 3 is fixedly installed with a first push cylinder 4. The lower end of the first push cylinder 4 is slidably installed on the inner mold base plate 12. One end of the two hydraulic rods 7 is movably hinged to both sides of the support box 3, and the other end of the two hydraulic rods 7 is movably hinged to the inner side of the corresponding inner mold side plate 12.

[0024] Both ends of the upper part of the support box 3 are equipped with a transverse movement mechanism 6, which is used to drive the inner mold top plate 11 to move laterally.

[0025] In this embodiment, the transverse movement mechanism 6 includes a second push cylinder 61, a pull rod 62, and an L-shaped slide plate 63. The two second push cylinders 61 are respectively fixedly installed on both sides of the support box 3. The top of the support box 3 is provided with a sliding groove 31. The two L-shaped slide plates 63 are slidably installed in the sliding groove 31. The pull rod 62 is fixedly installed on the upper end of the L-shaped slide plate 63, and the upper end of the pull rod 62 is fixedly connected to the corresponding inner mold top plate 11. The piston shaft of the second push cylinder 61 is inserted into the support box 3 and fixedly connected to the corresponding L-shaped slide plate 63.

[0026] Furthermore, to facilitate the removal of the support box 3, in this embodiment, a slide rail 5 is fixedly installed on the upper part of the tray 2 along the length direction, and the lower end of the first push cylinder 4 is slidably connected to the slide rail 5 through a slider.

[0027] To ensure that the inner mold side plate 12 can be folded smoothly, in this embodiment, both ends of the inner mold bottom plate 13 are provided with an integral structure that protrudes upward, and the lower end of the inner mold side plate 12 overlaps with the inner side of the corresponding block.

[0028] In this embodiment, the first jacking cylinder 4, the hydraulic rod 7, and the second jacking cylinder 61 are all controlled to start and stop via a remote control switch.

[0029] To further increase the stability of the pallet 2 and the inner mold top plate 11, in this embodiment, a support column is fixedly welded to the upper part of the support box 3, and the upper end of the support column is fixedly connected to the bottom of the pallet 2.

[0030] The specific operating steps are as follows: When demolding is required, first start the second push cylinder 61. The second push cylinder 61 can push the L-shaped slide plate 63 to move, thereby realizing the lateral movement of the inner mold top plate 11. Then start the hydraulic rod 7 to deflect the inner mold side plate 12. At this time, the inner mold side plate 12 will not hit the box beam. Then, control the support box 3 to descend through the first push cylinder 4 to complete the demolding of the inner mold top plate 11. Then connect the support box 3 to the external winch. The winch can pull the entire inner mold except for the inner mold bottom plate 13 out of the box beam. Finally, take out the inner mold bottom plate 13 to complete the demolding of the inner mold of the box beam.

[0031] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, the patent owner may make various modifications or alterations within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present invention, they shall all be within the protection scope of the present invention.

Claims

1. A precast box girder inner formwork comprising a box girder inner form, characterised in that: It also includes a tray, a support box, and two hydraulic rods; The box girder inner mold includes an inner mold bottom plate, two inner mold top plates and two inner mold side plates. The support plate has slots at both ends. One end of each of the two inner mold top plates is inserted into the slot. The upper ends of the two inner mold side plates are movably hinged to the outer ends of the two inner mold top plates. The two ends of the inner mold bottom plate overlap with the lower ends of the two inner mold side plates. The bottom of the support box is fixedly installed with a first push cylinder. The lower end of the first push cylinder is slidably installed on the inner mold base plate. One end of the two hydraulic rods is movably hinged to both sides of the support box, and the other end of the two hydraulic rods is movably hinged to the inner side of the inner mold side plate at the corresponding position. Both ends of the upper part of the support box are equipped with a transverse movement mechanism, which is used to drive the inner mold top plate to move laterally.

2. The precast box girder inner formwork according to claim 1, wherein: The transverse movement mechanism includes a second push cylinder, a pull rod, and an L-shaped slide plate. The two second push cylinders are fixedly installed on both sides of the support box. A sliding groove is opened on the top of the support box. The two L-shaped slide plates are slidably installed in the sliding groove. The pull rod is fixedly installed on the upper end of the L-shaped slide plate, and the upper end of the pull rod is fixedly connected to the corresponding inner mold top plate. The piston shaft of the second push cylinder is inserted into the support box and fixedly connected to the corresponding L-shaped slide plate.

3. The precast box girder inner formwork according to claim 1, wherein: A slide rail is fixedly installed on the upper part of the pallet along its length, and the lower end of the first push cylinder is slidably connected to the slide rail via a slider.

4. The precast box girder inner formwork according to claim 1, wherein: Both ends of the inner mold base plate are provided with an integrally structured upward protruding stop block, and the lower end of the inner mold side plate overlaps with the inner side of the corresponding stop block.

5. The precast box girder inner formwork according to claim 2, wherein: The first jacking cylinder, the hydraulic rod, and the second jacking cylinder are all controlled to start and stop via a remote control switch.

6. The precast box girder inner formwork according to claim 1, wherein: A support column is fixedly welded to the upper part of the support box, and the upper end of the support column is fixedly connected to the bottom of the tray.

Images