Variable span support apparatus for a through mobile formwork and method of displacement thereof

Abstract

The application provides a variable-span support device for a through-type movable formwork and a displacement method thereof, and belongs to the technical field of highway bridge construction. A plurality of main beam support point beams are arranged in the inner cavity of the main beam of the formwork, serving as force bearing support points of the main beam of the formwork and being used for variable-span support; and longitudinal slides are arranged between adjacent main beam support point beams, the longitudinal slides serving as connecting channels between the adjacent main beam support point beams, so that the suspended double-support-point self-balancing support device at the bottom of the main beam support point beam can slide from one main beam support point beam to another main beam support point beam along the longitudinal slide. The component structure of the application is simple, and all the components are installed in the inner part of the main beam of the formwork, effectively reducing the support height of the main beam of the formwork and increasing the stability and construction safety of the formwork; when the support point is converted, the crane is not needed for hoisting and transporting, and only a tow chain is needed to realize the sliding displacement of the support device.

Description

Variable span support device and its displacement method for under-bearing movable formwork Technical Field

[0001] This invention belongs to the field of highway bridge construction technology, specifically relating to a variable span support device for a bottom-type movable formwork and its displacement method. Background Technology

[0002] As an advanced construction equipment, the under-deck mobile formwork is widely used in the construction of cast-in-place box girders for highway and railway bridges due to its advantages such as high efficiency, safety, economy, and ease of control. With the continuous development of under-deck mobile formwork technology and engineering needs, it is also increasingly used in the construction of long-span bridges. During construction, due to the large span and heavy construction load, the main beam of the formwork has a high cross-section to meet the stress and deformation requirements. Conventional under-deck mobile formwork uses a support method with the bottom plate of the main beam supporting the formwork, which has poor anti-overturning ability. Moreover, in order to adapt to changes in span, there are problems such as complex structure, eccentric stress, long displacement time, and danger of personnel working at height. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a variable span support device and its displacement method for a bottom-supported movable formwork. This invention has a simple structure, reasonable force distribution, high safety, and allows for quick and convenient adjustment of the fulcrum support.

[0004] This invention is achieved through the following technical solution:

[0005] The present invention provides a variable span support device for a bottom-supported movable formwork, including a main beam of the formwork, a main beam support beam, a longitudinal slide rail, and a suspended double-support self-balancing support device;

[0006] Multiple main beam support beams are installed inside the main beam cavity of the formwork frame to serve as load-bearing support points for variable span support. The main beam support beams include vertical steel plates and bottom steel plates. Flanges are formed on both sides of the bottom steel plate, and multiple mounting holes are provided on the flanges. Longitudinal slides are installed between adjacent main beam support beams. The bottom sides of the longitudinal slides have side wings, which are connected to the flanges of the main beam support beams to form the slides.

[0007] A suspended double-support self-balancing support device is installed at the bottom of the main beam support beam. The suspended double-support self-balancing support device includes a support balance beam, a hinged connecting seat, a vertical support cylinder, and a hinged support foot. The hinged connecting seat is fixedly installed at the top middle position of the support balance beam. The hinged connecting seat is suspended from the flange of the main beam support beam by a hanging plate and is detachably connected to the main beam support beam by bolts. There are two vertical support cylinders, which are symmetrically arranged on both sides of the bottom of the support balance beam. A hinged support foot is provided at the bottom of each vertical support cylinder.

[0008] In the above technical solution, the cross-section of the main beam of the formwork frame is rectangular, including a top plate, two side webs and a bottom plate. Reinforcing ribs are provided on the inner walls of the top plate and side plates to ensure the strength of the main beam of the formwork frame.

[0009] In the above technical solution, the main beam support beam is welded to the two side webs and top plate of the main beam of the formwork frame as a whole.

[0010] In the above technical solution, an intermediate connecting beam is welded above the bottom steel plate of the main beam support beam. The intermediate connecting beam is welded to the vertical steel plate of the main beam support beam and to the web plates on both sides of the formwork main beam.

[0011] In the above technical solution, the hinged connection seat includes an upper support, a lower support, and a hanging plate. The upper support and the lower support are connected by a rotating shaft. The bottom plate of the lower support is fixedly connected to the fulcrum balance beam by bolts. The top plate of the upper support is connected to the hanging plates on both sides, and multiple bolt mounting holes are provided on the top plate of the upper support. These bolt mounting holes correspond to the mounting holes on the flange of the main beam fulcrum.

[0012] In the above technical solution, a drag chain connecting lug is also provided on the fulcrum balance beam for connecting the drag chain.

[0013] In the above technical solution, the hinged support foot adopts a ball head structure and is connected to the vertical support cylinder, which can realize universal adjustment.

[0014] In the above technical solution, a vertical reinforcing rib is provided at the middle position of the fulcrum balance beam to ensure its strength.

[0015] In the above technical solution, a through hole is provided on the bottom plate of the main beam of the mold frame, so that the bottom of the vertical support cylinder can pass through the through hole and be supported on the transfer trolley below it.

[0016] In the above technical solution, an entrance and exit gate is provided on the web of the main beam of the formwork frame, which is used for construction personnel to enter the inner cavity of the main beam of the formwork frame.

[0017] The variable span support device uses the following variable span displacement method:

[0018] Step 1: Before the variable span relocation, the two vertical support cylinders of the suspended double-support self-balancing support device retract synchronously, causing the main beam of the formwork to descend onto the relocation trolley, which then supports the main beam. At this time, the vertical support cylinders are fully retracted into the inner cavity of the main beam. Then, the relocation trolley drives the main beam of the formwork to move forward one pier position to the next construction location.

[0019] Step 2: After the main beam of the formwork is moved into place, the bolt connection between the suspended double-support self-balancing support device and the current main beam support beam is released. The suspended double-support self-balancing support device is suspended on the flange of the main beam support beam under the action of the hanging plate. The drag chain is connected to the support balance beam, and the suspended double-support self-balancing support device is slid along the longitudinal slide from the current main beam support beam to the new main beam support beam to be used by dragging. After it is moved into place, the suspended double-support self-balancing support device is bolted to the new main beam support beam. Finally, the vertical support cylinder of the suspended double-support self-balancing support device extends to support the main beam of the formwork and raise the main beam of the formwork.

[0020] The advantages and beneficial effects of this invention are as follows:

[0021] The variable span support device of the present invention has multiple main beam support beams set in the inner cavity of the main beam of the formwork as load-bearing support points for the main beam of the formwork for variable span support; and a longitudinal slide is set between adjacent main beam support beams, which serves as a connecting channel between adjacent main beam support beams, so that the suspended double support self-balancing support device at the bottom of the main beam support beam can slide along the longitudinal slide from one main beam support beam to another.

[0022] The suspended double-support self-balancing support device designed in this invention has two vertical support cylinders, which increases the number of force-bearing support points compared to a single vertical support cylinder, resulting in more stable support. Furthermore, the top of the support balance beam supports the main beam support beam via a hinged structure, allowing the support balance beam to rotate around the hinged connection axis to adapt to the pitch angle of the main beam of the mold frame, achieving balanced force distribution. Each vertical support cylinder has a hinged support foot at its bottom, allowing the hinged support foot at the bottom of the vertical support cylinder to self-adjust, ensuring stable and sufficient alignment with its lower support surface. Contact; In addition, since the hinged connecting seat is suspended on the flange of the main beam support beam by the hanging plate and is detachably connected to the main beam support beam by bolts, when the span changes, the bolt connection between the suspended double support self-balancing support device and the main beam support beam is released. The suspended double support self-balancing support device is suspended on the flange of the main beam support beam under the action of the hanging plate. The drag chain is connected to the support balance beam. By manually dragging, the suspended double support self-balancing support device is slid along the longitudinal slide from one main beam support beam to another main beam support beam, realizing the support point conversion of the variable span.

[0023] The components of this invention (main beam support beam, longitudinal slide rail, and suspended double-support self-balancing support device) have a simple structure and are all installed inside the main beam of the formwork, effectively reducing the support height of the main beam and increasing its stability and construction safety. During support point changes, no lifting equipment is required; the support device can be slid and repositioned using only a cable chain. The operation is simple, requires less manpower, and is quick to position, while ensuring the safety of personnel working inside the main beam of the formwork. Attached Figure Description

[0024] Figure 1 shows an application scenario of the under-supported movable formwork.

[0025] Figure 2 is a perspective structural schematic diagram of the variable span support device of the present invention.

[0026] Figure 3 is an internal structural view of the main beam section of the formwork of the variable span support device of the present invention.

[0027] Figure 4 is an internal structural view of the main beam section of the formwork of the variable span support device of the present invention (the suspended double-support self-balancing support device is hidden).

[0028] Figure 5 is a schematic diagram of the internal structure of the main beam of the formwork of the variable span support device of the present invention.

[0029] Figure 6 is a schematic diagram of the hinged connecting seat in the variable span support device of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0031] This invention designs a variable span support device and its relocation method for a bottom-supported movable formwork. First, the application scenario of the bottom-supported movable formwork is described. Referring to Figure 1, the bottom-supported movable formwork includes a main beam 1, which is supported on a support foundation 100 at a bridge pier location by a support cylinder. A relocation trolley 200 is installed below the main beam 1. When the formwork is in a fixed support state, the support cylinder is in an extended state, providing fixed support for the main beam 1. When the formwork needs to be moved, the support cylinder retracts, and the main beam 1 descends. After descending to its designated position, the main beam 1 rests on the relocation trolley 200, which then drives the formwork forward one bridge pier location to reach the next construction position. The variable span mentioned in this invention refers to the fact that after the formwork is moved forward, the span (i.e., spacing) between two adjacent piers is not a uniform fixed value and there will be different span situations. Therefore, it is necessary to change the support point position of the support cylinder of the main beam of the formwork to adapt to the needs of different span changes between piers.

[0032] Referring to Figures 2-6 below, the structure of the variable span support device designed in this invention will be described in detail.

[0033] The variable span support device designed in this invention includes a main beam 1, a main beam support beam 2, a longitudinal slide rail 3, and a suspended double-support self-balancing support device 4.

[0034] Referring to Figure 4, the cross-section of the main beam 1 of the formwork frame is rectangular, including a top plate 101, two side webs 102 and a bottom plate 103; furthermore, reinforcing ribs 104 are provided on the inner walls of the top plate 101 and the side plates 102 to ensure the strength of the main beam 1 of the formwork frame.

[0035] A main beam support beam 2 is installed inside the cavity of the main beam 1 of the formwork frame. The main beam support beam 2 is welded to the two side webs 102 and the top plate 101 of the main beam 1 of the formwork frame as a whole. The main beam support beam 2 is used as a load-bearing support point of the main beam 1 of the formwork frame. There are multiple main beam support beams 2, and the number is welded to the corresponding support points of the main beam 1 of the formwork frame according to the span variation. Further, referring to Figure 4, the main beam support beam 2 includes a vertical steel plate 201 and a bottom steel plate 202. Flanges 203 are formed on both sides of the bottom steel plate 202 (the horizontal direction refers to both sides along the width direction of the main beam 1 of the formwork frame), and multiple mounting holes 204 are arranged at intervals along the length direction on the flanges 203. Furthermore, an intermediate connecting beam 205 is welded above the bottom steel plate 202 of the main beam support beam 2. The intermediate connecting beam 205 is welded to the vertical steel plate 201 of the main beam support beam 2 and to the web plates 102 on both sides of the main beam 1 of the formwork, thereby strengthening the main beam 1 of the formwork and the main beam support beam 2.

[0036] Referring to Figure 5, a longitudinal slide rail 3 (longitudinal refers to the length direction along the main beam 1 of the formwork) is provided between adjacent main beam support beams 2. The longitudinal slide rail 3 is composed of welded steel plates and serves as a connecting channel between adjacent main beam support beams 2, allowing the suspended double-support self-balancing support device 4 at the bottom of the main beam support beam 2 to slide along the longitudinal slide rail 3 from one main beam support beam 2 to another. Specifically, the bottom of the longitudinal slide rail 3 has side wings 301 on both sides, which are connected to the flanges 203 of the main beam support beam 2, thus forming the function of the slide rail.

[0037] A suspended double-support self-balancing support device 4 is installed at the bottom of the main beam support beam 2, as shown in Figures 3 and 5. This suspended double-support self-balancing support device 4 includes a support balance beam 41, a hinged connecting seat 42, a vertical support cylinder 43, and hinged support feet 44. The hinged connecting seat 42 is fixedly installed at the top center of the support balance beam 41. The hinged connecting seat 42 is suspended from the flange 203 of the main beam support beam 2 via a hanging plate and is detachably connected to the main beam support beam 2 via bolts. Specifically, as shown in Figure 6, the hinged connecting seat 42 includes an upper support 421, a lower support 422, and a hanging plate 423. The upper support 421 and the lower support 422 are connected via a rotating shaft 424. The bottom plate of the lower support 422 is fixedly connected to the support balance beam 41 via bolts. The top plate of the upper support 421 is bolted to both sides by hanging plates 423, which suspend the upper support 421 on the flange 203 of the main beam support beam 2. Multiple bolt mounting holes 425 are provided on the top plate of the upper support 421, corresponding to mounting holes 204 on the flange 203 of the main beam support beam 2, thus enabling a detachable connection between the upper support 421 and the main beam support beam 2. Two vertical support cylinders 43 are symmetrically arranged on both sides of the bottom of the support balance beam 41, and each vertical support cylinder 43 has a hinged support foot 44 at its bottom. A through hole is provided on the bottom plate 103 of the main beam 1 of the formwork frame, allowing the bottom of the vertical support cylinder 43 to pass through and be supported on the shifting trolley below. Furthermore, a drag chain connecting lug 411 is provided on the support balance beam 41 for connecting a drag chain. Furthermore, the hinged support leg 44 adopts a ball joint structure and is connected to the vertical support cylinder 43, enabling universal adjustment. Furthermore, a vertical reinforcing rib plate 412 is provided at the middle position of the fulcrum balance beam 41 to ensure its strength. Furthermore, an access door is provided on the web plate 102 of the main beam 1 of the formwork frame, allowing construction personnel to enter the inner cavity of the main beam 1 of the formwork frame for bolt connections and cable chain connections (ensuring the safety of personnel working inside the main beam of the formwork frame).

[0038] The aforementioned suspended double-support self-balancing support device 4 has two vertical support cylinders 43. Compared to a single vertical support cylinder, this increases the number of force-bearing support points, resulting in more stable support. The height of the main beam 1 of the mold frame can be controlled by extending or retracting the vertical support cylinders 43. Furthermore, the top of the support balance beam 41 supports the main beam support beam 2 via a hinged structure, allowing the support balance beam 41 to rotate around the pivot 424 of the hinged connecting seat 42 to adapt to the pitch angle of the main beam 1 of the mold frame, achieving balanced force. Each vertical support cylinder 43 has a hinged support foot 44 at its bottom, allowing the hinged support foot 44 at the bottom of the vertical support cylinder 43 to self-adjust, ensuring... It makes stable and full contact with its lower support surface; in addition, since the hinged connecting seat 42 is suspended on the flange 203 of the main beam support beam 2 through the hanging plate 423 and is detachably connected to the main beam support beam 2 through bolts, when the span changes, the bolt connection between the suspended double support self-balancing support device 4 and the main beam support beam 2 is released. The suspended double support self-balancing support device 4 is suspended on the flange 203 of the main beam support beam 2 under the action of the hanging plate 423. The drag chain is connected to the support balance beam 41. By manually dragging, the suspended double support self-balancing support device 4 is slid along the longitudinal slide 3 from one main beam support beam 2 to another main beam support beam 2, realizing the support point conversion of the variable span.

[0039] Specifically, the variable span displacement method of the variable span support device is as follows:

[0040] Step 1: Before the span shift, the vertical support force conversion of the formwork is completed first. Specifically, the two vertical support cylinders 43 of the suspended double-support self-balancing support device 4 retract synchronously, causing the main beam 1 of the formwork to descend onto the shifting trolley 200, which then supports the main beam 1. At this time, the vertical support cylinders 43 no longer bear the support force and are fully retracted into the inner cavity of the main beam 1 (see Figure 2). Then, the shifting trolley 200 drives the main beam 1 of the formwork to move forward one pier position to the next construction location.

[0041] Step 2: After the main beam 1 of the formwork frame is moved into place, the bolt connection between the suspended double-support self-balancing support device 4 and the current main beam support beam 2 is released. The suspended double-support self-balancing support device 4 is suspended on the flange 203 of the main beam support beam 2 under the action of the hanging plate 423. The drag chain is connected to the support balance beam 41, and the suspended double-support self-balancing support device 4 is slid along the longitudinal slide 3 from the current main beam support beam 2 to the new main beam support beam 2 to be used. After it is moved into place, the suspended double-support self-balancing support device 4 is bolted to the new main beam support beam 2 to complete the fulcrum conversion of the variable span. Finally, the vertical support cylinder 43 of the suspended double-support self-balancing support device 4 extends to support the main beam 1 of the formwork frame and raise the main beam 1 of the formwork frame.

[0042] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0043] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0044] The present invention has been described above by way of example. It should be noted that any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort without departing from the core of the present invention fall within the protection scope of the present invention.

Claims

1. A variable span support device for a bottom-bearing movable formwork, characterized in that: It includes a main beam of the formwork frame, main beam support beams, longitudinal slide rails, and a suspended double-support self-balancing support device; multiple main beam support beams are set in the inner cavity of the main beam of the formwork frame as load-bearing support points for the main beam of the formwork frame, for use in variable span support; the main beam support beams include vertical steel plates and bottom steel plates, and the bottom steel plates have flanges on both sides in the transverse direction, and multiple mounting holes are provided on the flanges; A longitudinal slide is provided between adjacent main beam support beams. The bottom of the longitudinal slide has side wings on both sides, which are connected to the flanges of the main beam support beams to form the slide. A suspended double-support self-balancing support device is installed at the bottom of the main beam support beam. The suspended double-support self-balancing support device includes a support balance beam, a hinged connecting seat, a vertical support cylinder, and a hinged support foot. The hinged connecting seat is fixedly installed at the top middle position of the support balance beam. The hinged connecting seat is suspended from the flange of the main beam support beam by a hanging plate and is detachably connected to the main beam support beam by bolts. There are two vertical support cylinders, which are symmetrically arranged on both sides of the bottom of the support balance beam. Each vertical support cylinder has a hinged support foot at its bottom. The longitudinal slide serves as a connecting channel between adjacent main beam support beams, allowing the suspended double-support self-balancing support device at the bottom of the main beam support beam to slide along the longitudinal slide from one main beam support beam to another.

2. The variable span support device for a bottom-bearing movable formwork according to claim 1, characterized in that: The main beam of the formwork has a rectangular cross-section, including a top plate, two side webs and a bottom plate, with reinforcing ribs on the inner walls of the top plate and side plates.

3. The variable span support device for a bottom-bearing movable mold frame according to claim 2, characterized in that: The main beam support beam is welded to the two side webs and top plate of the main beam of the formwork frame as one piece.

4. The variable span support device for a bottom-bearing movable mold frame according to claim 2, characterized in that: An intermediate connecting beam is welded above the bottom steel plate of the main beam support beam. The intermediate connecting beam is welded to the vertical steel plate of the main beam support beam and to the web plates on both sides of the main beam of the formwork.

5. The variable span support device for a bottom-bearing movable formwork according to claim 1, characterized in that: The hinged connection seat includes an upper support, a lower support, and a hanging plate. The upper support and the lower support are connected by a rotating shaft. The bottom plate of the lower support is fixedly connected to the fulcrum balance beam by bolts. The top plate of the upper support is connected to the hanging plates on both sides, and multiple bolt mounting holes are provided on the top plate of the upper support. These bolt mounting holes correspond to the mounting holes on the flange of the main beam fulcrum.

6. The variable span support device for a bottom-bearing movable formwork according to claim 1, characterized in that: A drag chain connecting lug is also provided on the fulcrum balance beam for connecting the drag chain.

7. The variable span support device for a bottom-bearing movable formwork according to claim 1, characterized in that: The hinged support leg adopts a ball-head structure and is connected to the vertical support cylinder.

8. The variable span support device for a bottom-bearing movable formwork according to claim 1, characterized in that: A through hole is provided on the bottom plate of the main beam of the mold frame, through which the bottom of the vertical support cylinder can pass.

9. The variable span support device for a bottom-bearing movable mold frame according to claim 2, characterized in that: An entrance / exit is provided on the web of the main beam of the formwork, allowing construction workers to enter the inner cavity of the main beam.

10. A variable span displacement method, characterized in that, This method utilizes the variable span support device described in claim 1 and includes the following steps: Step 1: Before the variable span shift, the two vertical support cylinders of the suspended double-support self-balancing support device retract synchronously, causing the main beam of the formwork to descend onto the shifting trolley, which then supports the main beam. At this time, the vertical support cylinders are fully retracted into the inner cavity of the main beam. Then, the shifting trolley drives the main beam to move forward one pier position to the next construction location. Step 2: After the main beam is moved into place, the suspended double-support self-balancing support device is disconnected from the current... The bolted connections of the main beam support beams are as follows: the suspended double-support self-balancing support device is suspended on the flange of the main beam support beam under the action of the hanging plate; the drag chain is connected to the support balance beam, and by dragging, the suspended double-support self-balancing support device is slid along the longitudinal slide from the current main beam support beam to the new main beam support beam to be used; after moving into place, the suspended double-support self-balancing support device is bolted to the new main beam support beam; finally, the vertical support cylinder of the suspended double-support self-balancing support device extends to support the main beam of the formwork frame and raise the main beam of the formwork frame.

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