An inner mold for box beam casting

Abstract

The present application relates to an inner mold for casting a box girder, comprising an inner mold body arranged in a ring shape, the inner mold body comprising an upper module and a lower module, the upper module comprising two upper mold plates, the lower module comprising two lower mold plates, a support frame provided in the inner mold body, the support frame being connected to a first rotating shaft via a first connecting member, the support frame being connected to a second rotating shaft via a second connecting member, a first driving device and a second driving device provided on the support frame, the first driving device being used to drive the upper mold plate to rotate, and the second driving device being used to drive the lower mold plate to rotate. When disassembling, it is only necessary to pull the control rod by a winch, and sequentially drive the first pulling rod, the second pulling rod and the first connecting rod to slide, thereby first driving the upper mold plate to rotate inward, then driving the lower mold plate to rotate inward, and finally reducing the distance between the upper mold plate and the lower mold plate, separating the inner mold body from the box girder, and continuing to pull the control rod after separation to pull the inner mold body out from the inside of the cast box girder, thereby achieving disassembly of the inner mold.

Description

Technical Field

[0001] The present application relates to the field of construction equipment on construction sites, and in particular to an inner mold for casting box beams. Background Art

[0002] The prefabricated box beams and prefabricated hollow slab beams of expressways are all prefabricated on site. However, due to the limited space and inconvenience of manual operation, the removal of the inner formwork of the prefabricated beams is relatively difficult.

[0003] During pouring, an inner mold is placed inside an outer mold, creating a cavity for pouring concrete. Once the concrete is poured and formed, the inner and outer molds are removed to reveal the cast box girder. The inner mold consists of several detachably connected formwork panels, arranged in a ring-like structure. A support structure is also required within the ring-like structure to support the formwork panels during pouring.

[0004] When applying the above technology, although the overall supporting structure is very stable, after pouring is completed, when you want to remove the inner formwork, the operator needs to enter the box girder, first remove the supporting structure, and then remove the formwork. The operation steps are complicated, and the temperature inside the newly cast box girder is high, so it is very inconvenient to perform disassembly operations inside the box girder. Summary of the Invention

[0005] In order to facilitate the disassembly of the inner mold after the operation is completed, the present application provides an inner mold for box girder casting.

[0006] The present application provides an inner mold for casting a box girder, which adopts the following technical solution: an inner mold for casting a box girder, comprising an inner mold body arranged in a ring shape, the inner mold body comprising an upper module and a lower module, the upper module comprising two upper mold plates arranged opposite to each other, the two upper mold plates being rotatably connected by a first rotating shaft, the lower module comprising two lower mold plates arranged opposite to each other, the two lower mold plates being rotatably connected by a second rotating shaft, a support frame being provided in the inner mold body, the support frame being connected to the first rotating shaft by a first connecting member, the support frame being connected to the second rotating shaft by a second connecting member, the first connecting member and / or the second connecting rod being telescopically arranged, and a first driving device and a second driving device being provided on the support frame, the first driving device being used to drive the upper mold plate to rotate, and the second driving device being used to drive the lower mold plate to rotate.

[0007] Preferably, the first driving device includes a first pulling rod, one end of the first pulling rod is slidably connected to the support frame, the other end of the first pulling rod is rotatably connected to the first connecting rod, and the end of the first connecting rod away from the first pulling rod is rotatably connected to the inner wall of the upper template. The support frame is provided with a first driving member, and the first driving member is used to drive the first pulling rod to slide and be fixed relative to the support frame.

[0008] Preferably, the second driving device includes a second pulling rod, one end of the second pulling rod is slidingly connected to the support frame, the other end of the second pulling rod is rotatably connected to the second connecting rod, and the end of the second connecting rod away from the second pulling rod is rotatably connected to the inner wall of the lower template. The support frame is provided with a second driving member, and the second driving member is used to drive the second pulling rod to slide and be fixed relative to the support frame.

[0009] Preferably, the first connecting member includes a first connecting rod, one end of which is rotatably connected to the first rotating shaft, and the other end of the first connecting rod is slidably connected to the support frame, and the support frame is provided with a third driving member for driving the first connecting rod to slide in the vertical direction and to be fixed.

[0010] Preferably, a control rod is slidably connected in the support frame, the first driving member includes a first protrusion arranged on the side of the control rod, the first protrusion is provided with a first cam groove, the first pulling rod is provided with a first slide rod, and the first slide rod is slidably arranged in the first cam groove; the second driving member includes a second protrusion arranged on the side of the control rod, the second protrusion is provided with a second cam groove, the second pulling rod is provided with a second slide rod, and the second slide rod is slidably arranged in the second cam groove; the third driving member includes a third protrusion arranged on the top surface of the control rod, the third protrusion is provided with a third cam groove, the first connecting rod is provided with a third slide rod, and the third slide rod is slidably arranged in the third cam groove; after the control rod slides, it drives the first slide rod, the second slide rod and the first connecting rod to slide in sequence.

[0011] Preferably, the second connecting member includes a second connecting rod, one end of the second connecting rod is fixed to the support frame, and the other end of the second connecting rod is rotatably connected to the second rotating shaft.

[0012] Preferably, a pull ring is fixedly connected to the end of the control rod, and a fixing piece is provided on the support frame, and the fixing piece is used to fix the control rod in the support frame.

[0013] Preferably, the first pulling rod, the second pulling rod and the first connecting rod are all provided with open slots, and the first sliding rod, the second sliding rod and the third sliding rod are respectively arranged in the corresponding open slots.

[0014] Preferably, an end of the upper template away from the first rotating shaft is provided with an abutting surface, the abutting surface is arranged at an inclination, and a sealing surface cooperating with the abutting surface is provided on the lower template.

[0015] Preferably, both the upper module and the lower module are provided with chamfer structures.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. When pouring, select the corresponding number of inner mold bodies according to the length of the box beam and splice them in sequence. It can adapt to the pouring of box beams of different lengths and has strong adaptability;

[0018] 2. During disassembly, it is only necessary to pull the control rod through the winch to drive the first pulling rod, the second pulling rod and the first connecting rod to slide in turn. After the first pulling rod slides, it drives the upper formwork to rotate inward. Then, after the second pulling rod slides, it drives the lower formwork to rotate inward. Finally, after the first connecting rod slides, the distance between the upper formwork and the lower formwork is reduced, thereby separating the inner formwork body from the box beam. After separation, continue to pull the control rod to pull the inner formwork body out from the inside of the cast box beam to achieve disassembly of the inner formwork. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the splicing state of multiple inner mold bodies in an embodiment of the present application.

[0020] Figure 2 This is a schematic diagram of the overall structure of a single inner mold body of an embodiment of the present application (the upper module and the lower module are in a closed state).

[0021] Figure 3 This is a schematic diagram of the upper module and the lower module in the embodiment of the present application in a retracted state;

[0022] Figure 4 is a schematic diagram of the control rod structure of an embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of the assembly of the first pulling rod, the second pulling rod and the first connecting rod in an embodiment of the present application.

[0024] Explanation of the accompanying drawings: 1. Upper module; 11. Upper template; 111. Abutment surface; 12. First rotating shaft; 2. Lower module; 21. Lower template; 211. Sealing surface; 22. Second rotating shaft; 3. Chamfered structure; 4. Support frame; 41. Pin rod; 42. Second connecting rod; 43. Sleeve; 5. First pulling rod; 51. First connecting rod; 52. First sliding rod; 6. Second pulling rod; 61. Second connecting rod; 62. Second sliding rod; 7. First connecting rod; 71. Third sliding rod; 8. Control rod; 81. First protrusion; 811. First cam groove; 82. Second protrusion; 821. Second cam groove; 83. Third protrusion; 831. Third cam groove; 84. Pull ring; 85. Pin hole; 9. Opening groove. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-5 This application is described in further detail.

[0026] The embodiment of the present application discloses an inner mold for casting a box beam. Figure 1 as well as Figure 2The inner mold consists of a ring-shaped inner mold body with a square vertical cross-section. During casting, the corresponding number of inner mold bodies is selected according to the length of the box beam to be cast. Several inner mold bodies are sequentially spliced ​​along the length of the inner mold bodies to form the inner mold.

[0027] The inner mold body includes an upper module 1 and a lower module 2. The upper module 1 and the lower module 2 are respectively arranged in a U-shape. The openings of the upper module 1 and the lower module 2 are arranged relative to each other. The upper module 1 includes two upper templates 11 arranged relative to each other. The two upper templates 11 are rotatably connected by a first rotating shaft 12. A through hole for the first rotating shaft 12 to pass through is provided on the two upper templates 11. The lower module 2 includes two lower templates 21 arranged relative to each other. The upper templates 11 and the lower templates 21 are both arranged in an L-shape. The two lower templates 21 are rotatably connected by a second rotating shaft 22. The first rotating shaft 12 is arranged parallel to the second rotating shaft 22. The first rotating shaft 12 is set in the middle position of the top of the inner mold body, and the second rotating shaft 22 is set in the middle position of the bottom of the inner mold body. A number of supporting ribs are provided on the inner surface of the upper template 11 and the lower template 21. The number of supporting ribs are staggered horizontally and vertically to improve the structural strength of the upper template 11 and the lower template 21.

[0028] Reference Figure 2 as well as Figure 3 To facilitate the rotation of the upper and lower mold plates 11 and 21 during demolding, an abutment surface 111 is provided at the end of the upper mold plate 11 away from the first rotation axis 12. The abutment surface 111 is tilted, and a sealing surface 211 is provided on the lower mold plate 21 to cooperate with the abutment surface 111. When the abutment surface 111 and the sealing surface 211 are in contact, the upper and lower mold plates 1 and 2 are closed, forming a complete inner mold body, at which point casting operations can begin. In addition, to facilitate the rotation of the upper and lower mold plates 11 and 21 during demolding, chamfer structures 3 are provided on both the upper and lower mold plates 1 and 2. The chamfer structures 3 are located at the corners of the upper and lower mold plates 11 and 21 to reduce interference between the upper and lower mold plates 11 and 21 and the inner surface of the box girder during demolding.

[0029] In order to further improve the sealing performance of the upper module 1 and the lower module 2, a right angle and a rounded corner can be set at one end of the upper template 11 close to the first rotating shaft 12. The right angle is set close to the outer side of the inner mold body, and the rounded corner is close to the inner side of the inner mold body. After the upper module 1 and the lower module 2 are closed, the right-angled surfaces of the two upper templates 11 can cooperate with each other, which can not only play a sealing role, but also play a limiting role, limiting the rotation range of the two upper templates 11. The lower template 21 is set in the same way.

[0030] Reference Figure 2 as well as Figure 3A support frame 4 is provided within the inner mold body. The support frame 4 is welded from a plurality of steel pipes. The length of the support frame 4 is parallel to that of the inner mold body and is shorter than that of the inner mold body. The support frame 4 is connected to the first rotating shaft 12 via a first connecting member, and to the second rotating shaft 22 via a second connecting member. In this embodiment, the first connecting member is retractable, while the second connecting member is fixed in length. The support frame 4 is provided with a first drive device and a second drive device. The first drive device is used to rotate the upper mold plate 11, and the second drive device is used to rotate the lower mold plate 21.

[0031] When demolding is required after pouring is completed, the first driving device first drives the two upper templates 11 to rotate relative to each other, and the two upper templates 11 are out of contact with the inner surface of the box beam. Then the second driving device drives the two lower templates 21 to rotate relative to each other, and the two lower templates 21 are out of contact with the inner surface of the box beam. Finally, the length of the first connecting piece is shortened, and the upper module 1 and the lower module 2 are close to each other, releasing the contact between the entire inner mold body and the box beam, and finally the inner mold body can be dragged out from the inside of the box beam.

[0032] Reference Figure 4 as well as Figure 5 The first driving device includes a first pulling rod 5, one end of the first pulling rod 5 is slidingly connected to the support frame 4 through a sleeve 43, the sleeve 43 is welded and fixed to the support frame 4, and a triangular rib plate is provided on the support frame 4, one end of the rib plate is welded to the support frame 4, and the other end is welded to the sleeve 43. The other end of the first pulling rod 5 is rotatably connected to the first connecting rod 51, and the end of the first connecting rod 51 away from the first pulling rod 5 is rotatably connected to the inner wall of the upper template 11. A first driving member is provided on the support frame 4, and the first driving member is used to drive the first pulling rod 5 to slide and fix relative to the support frame 4. When the first pulling rod 5 is parallel to the first connecting rod 51, the upper template 11 and the lower template 21 are in a closed state, and the first driving member fixes the first pulling rod 5 to the support frame 4.

[0033] Reference Figure 4 as well as Figure 5 The second driving device includes a second pulling rod 6, one end of which is also slidably connected to the support frame 4 through the sleeve 43. The other end of the second pulling rod 6 is rotatably connected to the second connecting rod 61. The end of the second connecting rod 61 away from the second pulling rod 6 is rotatably connected to the inner wall of the lower template 21. The support frame 4 is provided with a second driving member, which is used to drive the second pulling rod 6 to slide and fix relative to the support frame 4. When the second pulling rod 6 is parallel to the second connecting rod 61, the upper template 11 and the lower template 21 are in a closed state, and the second driving member fixes the second pulling rod 6 to the support frame 4.

[0034] Reference Figure 4 as well as Figure 5The first connecting member includes a first connecting rod 7, one end of which is rotationally connected to the first rotating shaft 12, and the other end of the first connecting rod 7 is also slidingly connected to the support frame 4 via a sleeve 43. There are two first connecting rods 7, one of which is respectively provided at the two ends of the support frame 4. The support frame 4 is provided with a third driving member that drives the first connecting rod 7 to slide and fix in the vertical direction. When the first connecting rod 7 slides to the highest point, the upper template 11 and the lower template 21 are in a closed state. The second connecting member includes a second connecting rod 42, one end of the second connecting rod 42 is fixed to the support frame 4, and the other end of the second connecting rod 42 is rotationally connected to the second rotating shaft 22. There are at least two second connecting rods 42, and the two second connecting rods 42 are respectively provided at the two ends of the support frame 4.

[0035] To achieve stable support, in this embodiment, each upper template 11 corresponds to two first pulling rods 5, and the two first pulling rods 5 are distributed along the length direction of the support frame 4; each lower template 21 corresponds to two second pulling rods 6, and the two second pulling rods 6 are also distributed along the length direction of the support frame 4.

[0036] A control rod 8 is slidably connected within the support frame 4. A plurality of cross bars can be provided on the support frame 4 for supporting and limiting the control rod 8. The first driving member includes a first protrusion 81 provided on the side of the control rod 8. The first protrusion 81 is provided with a first cam groove 811. A first sliding rod 52 is provided on the first pulling rod 5. The first sliding rod 52 is slidably provided in the first cam groove 811.

[0037] The second driving member includes a second protrusion 82 arranged on the side of the control rod 8, a second cam groove 821 is provided on the second protrusion 82, and a second sliding rod 62 is provided on the second pulling rod 6, and the second sliding rod 62 is slidably set in the second cam groove 821; the third driving member includes a third protrusion 83 arranged on the top surface of the control rod 8, a third cam groove 831 is provided on the third protrusion 83, and a third sliding rod 71 is provided on the first connecting rod 7, and the third sliding rod 71 is slidably set in the third cam groove 831.

[0038] The first cam groove 811, the second cam groove 821, and the third cam groove 831 are all of equal length and are each composed of a support segment, a transition segment, and a stop segment connected in sequence. The support segment and the stop segment are straight, and the transition segment is inclined. When the slide bar is in the support segment, the upper module 1 and the lower module 2 are in a closed state; when the slide bar is in the stop segment, the upper module 1 and the lower module 2 are in a retracted state. The specific lengths of the support segment and the stop segment, the length of the transition segment, and the inclination angle of the first cam groove 811, the second cam groove 821, and the third cam groove 831 can be set according to the actual swing angle of the upper template 11 and the lower template 21, and will not be elaborated on here.

[0039] In order to improve the stability of the driving process, open grooves 9 are provided on the first pulling rod 5, the second pulling rod 6 and the first connecting rod 7, and the first sliding rod 52, the second sliding rod 62 and the third sliding rod 71 are respectively arranged in the corresponding opening grooves 9. In addition, the thickness of the first protrusion 81, the second protrusion 82 and the third protrusion 83 are equal to the opening groove 9, and one end of the first protrusion 81, the second protrusion 82 and the third protrusion 83 are all slidingly connected to the opening groove 9.

[0040] To facilitate the operation of control rod 8, a pull ring 84 is fixedly attached to the end of control rod 8. During operation, the winch's pull rope is secured to pull ring 84. To prevent control rod 8 from slipping during pouring, a fixing member is provided on support frame 4 to secure control rod 8 within support frame 4 during pouring. The fixing member comprises a pin 41 slidably mounted on support frame 4. A pin hole 85 is provided on the side of control rod 8 for insertion of pin 41. When upper and lower mold plates 11 and 21 are in the closed position, pin 41 aligns with pin hole 85.

[0041] Furthermore, to facilitate the pulling of other inner mold bodies within the box beam, a connecting rope can be provided between adjacent inner mold bodies. One end of the connecting rope, facing the direction in which the inner mold body slides out, is secured to the corresponding support frame 4, while the other end is secured to the pull ring 84 within the next inner mold body. When the first inner mold body slides outward within the box beam, the connecting rope is tightened, which in turn pulls the control rod 8 within the second inner mold body, causing the second inner mold body to retract. This action is repeated sequentially, ultimately pulling each inner mold body within the box beam out in sequence, further facilitating demoulding operations.

[0042] It should be noted that when setting the connecting rope, it is necessary to cancel the pin rod 41, or set a separate control rope on the pin rod 41, and pull out all the pin rods 41 through the corresponding control rope before demoulding.

[0043] The implementation principle of the inner mold for box girder casting of the embodiment of the present application is as follows: during casting, the control rod 8 is located in the support frame 4, at this time, the first pulling rod 5 is parallel to the first connecting rod 51, the second pulling rod 6 is parallel to the second connecting rod 61, the top of the first connecting rod 7 is at the highest point, the abutting surface 111 is in contact with the sealing surface 211, and the upper module 1 and the lower module 2 are in a closed state and remain in the closed state;

[0044] When demolding, first pull out the pin rod 41 and pull the control rod 8. At this time, the first protrusion 81, the second protrusion 82 and the third protrusion 83 slide at the same time, and the first cam groove 811 first drives the first pulling rod 5 to slide toward the support frame 4, driving the two upper templates 11 to rotate relative to each other, separating the upper template 11 from the box beam; then the second cam groove 821 drives the second pulling rod 6 to slide toward the support frame 4, driving the two lower templates 21 to slide relative to each other, separating the lower template 21 from the box beam; finally, the third cam groove 831 drives the first connecting rod 7 to slide toward the support frame 4, driving the first rotating shaft 12 to move toward the support frame 4, reducing the height of the inner mold body and reducing the contact between the inner mold body and the inner wall of the box beam. At this time, the first slide bar 52, the second slide bar 62 and the third slide bar 71 all slide to the end of the corresponding cam groove, and continue to pull the control rod 8. The control rod 8 cannot slide in the support frame 4. The control rod 8 can drive the support frame 4 and the entire inner mold body to slide, dragging the inner mold body out from the inside of the box beam.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An inner mold for box girder casting, comprising an inner mold body arranged in an annular shape, the inner mold body comprising an upper module (1) and a lower module (2), the upper module (1) comprising two upper templates (11) arranged opposite to each other, the two upper templates (11) being rotatably connected via a first rotating shaft (12), the lower module (2) comprising two lower templates (21) arranged opposite to each other, the two lower templates (21) being rotatably connected via a second rotating shaft (22), and characterized in that: A support frame (4) is provided in the inner mold body, the support frame (4) is connected to the first rotating shaft (12) through a first connecting member, the support frame (4) is connected to the second rotating shaft (22) through a second connecting member, the first connecting member is telescopically arranged, and a first driving device and a second driving device are provided on the support frame (4), the first driving device is used to drive the upper template (11) to rotate, and the second driving device is used to drive the lower template (21) to rotate; the first driving device includes a first pulling rod (5), one end of the first pulling rod (5) is slidably connected to the support frame (4), and the other end of the first pulling rod (5) is rotatably connected to the first connecting rod (51), and the first connecting rod (51) is away from the first pulling rod. One end of the rod (5) is rotatably connected to the inner wall of the upper template (11), and the support frame (4) is provided with a first driving member, and the first driving member is used to drive the first pulling rod (5) to slide and fix relative to the support frame (4); the second driving device includes a second pulling rod (6), one end of the second pulling rod (6) is slidably connected to the support frame (4), and the other end of the second pulling rod (6) is rotatably connected to a second connecting rod (61), and the end of the second connecting rod (61) away from the second pulling rod (6) is rotatably connected to the inner wall of the lower template (21), and the support frame (4) is provided with a second driving member, and the second driving member is used to drive the second pulling rod (6) to slide and fix relative to the support frame (4); the first connecting member The invention comprises a first connecting rod (7), one end of the first connecting rod (7) is rotatably connected to the first rotating shaft (12), the other end of the first connecting rod (7) is slidably connected to the support frame (4), and the support frame (4) is provided with a third driving member for driving the first connecting rod (7) to slide in the vertical direction and to be fixed; a control rod (8) is slidably connected in the support frame (4), the first driving member comprises a first protrusion (81) arranged on the side of the control rod (8), the first protrusion (81) is provided with a first cam groove (811), the first pulling rod (5) is provided with a first sliding rod (52), the first sliding rod (52) is slidably arranged in the first cam groove (811); the second driving member comprises a first protrusion (81) arranged on the side of the control rod (8), the first protrusion (81) is provided with a first cam groove (811), the first pulling rod (5) is provided with a first sliding rod (52), and the first sliding rod (52) is slidably arranged in the first cam groove (811); the second driving member comprises a first protrusion (81) arranged on the side of the control rod (8), the first cam groove (811) is provided on the first protrusion (81 ... pulling rod (5). A second protrusion (82) is provided on the side of the control rod (8), a second cam groove (821) is provided on the second protrusion (82), a second sliding rod (62) is provided on the second pulling rod (6), and the second sliding rod (62) is slidably arranged in the second cam groove (821); the third driving member includes a third protrusion (83) provided on the top surface of the control rod (8), a third cam groove (831) is provided on the third protrusion (83), and the first connecting rod (7) is provided with a third sliding rod (71), and the third sliding rod (71) is slidably arranged in the third cam groove (831); after the control rod (8) slides, it drives the first sliding rod (52), the second sliding rod (62) and the first connecting rod (7) to slide in sequence.

2. The inner mold for box beam casting according to claim 1, characterized in that: The second connecting member comprises a second connecting rod (42), one end of the second connecting rod (42) is fixed to the support frame (4), and the other end of the second connecting rod (42) is rotatably connected to the second rotating shaft (22).

3. The inner mold for box beam casting according to claim 2, characterized in that: The end of the control rod (8) is fixedly connected with a pull ring (84), and the support frame (4) is provided with a fixing piece, which is used to fix the control rod (8) in the support frame (4).

4. The inner mold for casting a box beam according to claim 1, characterized in that: The first pulling rod (5), the second pulling rod (6) and the first connecting rod (7) are all provided with an opening slot (9), and the first sliding rod (52), the second sliding rod (62) and the third sliding rod (71) are respectively arranged in the corresponding opening slots (9).

5. The inner mold for casting a box beam according to claim 1, characterized in that: An end of the upper template (11) away from the first rotating shaft (12) is provided with an abutting surface (111), the abutting surface (111) being inclined, and a sealing surface (211) cooperating with the abutting surface (111) is provided on the lower template (21).

6. The inner mold for casting a box beam according to claim 1, characterized in that: The upper module (1) and the lower module (2) are both provided with chamfer structures (3).

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