A hydraulically jacked integral steel frame platform and its overmolding construction method

Abstract

The present invention relates to the field of bridge construction technology, in particular to a hydraulic jacking integral steel frame platform and its overmolding construction method, comprising an electric hoist, a jacking frame, a lower hanger, a horizontal strut, an oblique strut, a roller strut, a jack, a support rod and a lower anti-fall clamp. The hydraulic jacking integral steel frame platform and its overmolding construction method of the present invention adopt a ground-based support rod as a fulcrum, which has low requirements on the strength of the newly poured concrete and can climb after the initial setting of the concrete, thereby shortening the pier body segment construction period and accelerating the construction progress; the position of the jacking and hoisting mechanism can be adjusted by an overhead translation method, making it more widely applicable; the combined overmolding with a detachable structural design is not only convenient for loading and unloading operations, but also can use the internal horizontal assembly limit tube to perform lateral support and limit on the support rod, ensuring the stability of the interior of the support rod and the mold processing, and ensuring the verticality of the jacking process.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, in particular to a hydraulically jacked integral steel frame platform and a mold turning construction method thereof. Background Art

[0002] A bridge pier generally refers to the middle supporting structure of a span bridge. In addition to bearing the load of the structure, it also bears the pressure of flowing water, the wind force above the water surface, and the possible pressure of flowing water, and the impact of ships, floating objects or cars. Abutments are set at both ends of the bridge. In addition to supporting the bridge structure, they also serve as structures connecting the embankments on both sides.

[0003] With the continuous innovation of bridge structures, the design heights of bridge piers are constantly increasing, placing higher demands on bridge construction technology. The construction of high bridge piers is characterized by high construction difficulty and safety risks. Traditional, mature construction techniques are difficult to meet the current comprehensive requirements of construction progress and quality. Furthermore, the numerous safety risks associated with high pier construction represent a challenge that current construction management must address. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problems existing in the above-mentioned background technology, an improved hydraulic jacking integral steel frame platform and its mold turning construction method are provided to solve the problem that traditional mature construction technology is difficult to meet the current comprehensive requirements of construction progress and quality, and there are many safety risks in high pier construction.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a hydraulic jacking integral steel frame platform mold, including an electric hoist, a jacking frame, a lower hanger, a horizontal support rod, an oblique support rod, a roller support rod, a jack, a support rod and a lower anti-fall clamp. The top of the jacking frame is equipped with a top guide rail for assembling the electric hoist, and the top surface of the jacking frame is provided with a top assembly frame controlled by the electric hoist. The upper end of the jack is installed at the bottom of the top assembly frame through a fixed assembly seat. The jack and the lower anti-fall clamp are fixed to the outside of the support rod by clamping. A square steel frame is fixedly installed in the lower hanger for the convenience of construction by operators. A combined mold is provided on the inner side of the lower hanger. The inner side of the jacking frame is fixedly equipped with a built-in support beam above the lower anti-fall clamp.

[0006] A lateral assembly seat for installing a horizontal support rod, an oblique support rod and a roller support rod is fixed on the lower hanger adjacent to the building surface.

[0007] The combined turnover mold includes a first mold body, a second mold body, a transverse assembly limiting tube that transversely passes through the first mold body and the second mold body, and lateral locking seats fixedly installed on both sides of the transverse assembly limiting tube.

[0008] A flip-type bottom support plate is movably mounted on the inner bottom surface of the square steel frame adjacent to the combined flip-type mold end.

[0009] The horizontal assembly limit tube includes a first arc-shaped limit tube located on one side of the support rod and a second arc-shaped limit tube located on the other side of the support rod. The first arc-shaped limit tube and the second arc-shaped limit tube both have an integrated arc-shaped limit section at the support rod position. Both ends of the first arc-shaped limit tube and the second arc-shaped limit tube are axially fixed with external threaded locking plates that match the lateral locking seat.

[0010] An inner locking mechanism is staggeredly installed on the assembly surfaces of the first arc-shaped limiting tube and the second arc-shaped limiting tube.

[0011] A side assembly frame is welded and fixed on the outer sides of the first mold body and the second mold body, and the top ends of the horizontal support rods and the oblique support rods are assembled and limited with the side assembly frame through side bolts.

[0012] A plurality of side-mounted circular assembly through holes matching with the lateral locking seats are provided on the outer side surfaces of the first mold body and the second mold body.

[0013] The lower end of the top assembly frame is fixedly equipped with an overhead winch lifting device for conveniently lifting the first mold body and the second mold body.

[0014] A method for constructing a hydraulically jacked integral steel frame platform. After the foundation is constructed, the cross-sectional contour line of the pier body and the bottom is first laid out, the debris within the pier body is roughened and washed, the main reinforcement is extended, and the stirrups of the first section of the pier body are tied. The structural installation of the steel frame platform and the hydraulic jacking system is carried out simultaneously with the pier body construction, and the installation steps are carried out in a top-down order.

[0015] After installing the outer formwork at the solid section of the pier bottom, install the lower hanger, jacking frame, jack, support rod and hydraulic control system;

[0016] After the solid section concrete is poured and the concrete is strengthened for a few hours, the hydraulically controlled jack can be activated to drive the lower hanger and the jacking frame to climb to the appropriate height. Then, the steel bars and combined turnover formwork of the variable section section can be installed. The remaining layers of the inner hanger bottom plates can be stacked in sequence on the steel benches in the cavity of the variable section section of the pier body. While installing the inner square frame, the second layer of hangers under the lower hanger can be installed at the same time.

[0017] After pouring the variable cross-section concrete, wait for a few hours for the steel frame to strengthen and then lift it up 2m, then install the hanger rod of the inner hanger of the -2 layer and the outer hanger of the -3 layer;

[0018] As the segmental crushing and casting steel frame rises, the lower hangers of the subsequent bottom layer are installed layer by layer, and all wind-resistant and anti-fall support rods are installed. When installing the roller support rod, the reasonable gap between the roller and the pier body surface is adjusted through the screw.

[0019] The beneficial effects of the present invention are:

[0020] (1) The hydraulically lifted integral steel frame platform and its re-molding construction method of the present invention use a ground support rod as a fulcrum, which has low requirements on the strength of the newly poured concrete and can be lifted after the concrete is initially set, thereby shortening the construction period of the pier body segment and accelerating the construction progress;

[0021] (2) The top-mounted translation method can adjust the position of the jacking and hoisting mechanism, making it more widely applicable;

[0022] (3) The combined flip mold with detachable structure design is not only convenient for loading and unloading operations, but also can use the internal horizontal assembly limit tube to lateral support and limit the support rod, ensuring the stability of the support rod and the mold processing, and ensuring the verticality of the jacking process;

[0023] (4) The use of a built-in support beam above the lower anti-fall clamp can enhance the protection capability in the event of a fall, greatly improving safety;

[0024] (5) The lateral hydraulic control system can ensure the stability and safety of the assembly of the lower hanger and the square steel frame;

[0025] (6) The use of the flip mold process makes the construction joint interface uniform and has a good slurry stopping effect. The formwork and the working platform are completely separated and independent of each other, avoiding the disturbance of the concrete by other operations on the working platform before the concrete solidifies due to the traditional flip mold process. The concrete quality is better.

[0026] (7) The frame platform and slot positioning frame installed on the lifting frame replace the rigid frame, that is, as an operating platform for steel bar connection operations, it better solves the positioning problem of main bar connection and saves the material and installation cost of the rigid frame. The steel platform can be designed in a modular manner, which is convenient for flexible combination and reuse, and the consumption of auxiliary materials is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and examples.

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Figure 2 It is a partial schematic diagram of the assembly end of the jacking frame in the present invention.

[0030] Figure 3 It is an internal cross-sectional view of the assembly end of the horizontally assembled limiting tube in the present invention. DETAILED DESCRIPTION

[0031] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] Figure 1 、 Figure 2 and Figure 3 The hydraulic jacking integral steel frame platform mold shown includes an electric hoist 1, a jacking frame 2, a lower hanger 3, a horizontal support rod 5, an oblique support rod 6, a roller support rod 7, a jack 8, a support rod 9 and a lower anti-fall clamp 10. The top of the jacking frame 2 is provided with a top guide rail 11 for assembling the electric hoist 1. The top surface of the jacking frame 2 is provided with a top assembly frame 12 controlled by the electric hoist 1. The upper end of the jack 8 is installed at the bottom of the top assembly frame 12 through a fixed assembly seat. The jack 8 and the lower anti-fall clamp 10 are fixed to the outside of the support rod 9 by clamping. The lower hanger 3 is fixedly equipped with a square steel frame 4 for the convenience of construction by the operator. The inner side of the lower hanger 3 is provided with a combined mold. The inner side of the jacking frame 2 is fixedly equipped with a built-in support beam 13 above the lower anti-fall clamp 10.

[0034] Both the electric hoist 1 and the jack 8 are conventional technology. The electric hoist 1 is used to horizontally adjust the translation of the top assembly frame 12, while the through-hole jack of the jack 8 is clamped to the support rod 9 via a wedge clip, transferring the load from the steel frame platform to the support rod 9. Because the through-hole jack climbs along the support rod 9, there is no need to change the fulcrum during each cycle of the hydraulic climbing formwork. After the concrete pour is completed and reaches a certain strength, the steel frame platform is driven by the through-hole jack along the support rod 9 via the jacking frame 2 to climb the height of the construction section.

[0035] In order to cooperate with the inner assembly, a lateral assembly seat 14 for installing the horizontal support rod 5, the oblique support rod 6, and the roller support rod 7 is fixed on the lower hanger 3 near the building surface.

[0036] In order to improve the assembly stability of the mold and the support rod 9 and ensure uniform gap, the combined mold includes a first mold body 15, a second mold body 16, a horizontal assembly limit tube 17 that transversely passes through the first mold body 15 and the second mold body 16, and a lateral locking seat 18 fixedly installed on both sides of the horizontal assembly limit tube 17.

[0037] In order to facilitate close-range construction, a flip-type bottom support plate 19 is movably assembled on the inner bottom surface of the square steel frame 4 near the combined flip-type mold end.

[0038] In order to improve the internal limiting performance, the transversely assembled limiting tube 17 includes a first arc-shaped limiting tube 20 located on one side of the support rod 9 and a second arc-shaped limiting tube 21 located on the other side of the support rod 9. The first arc-shaped limiting tube 20 and the second arc-shaped limiting tube 21 are both located at the position of the support rod 9 and have an integral arc-shaped limiting section 22. Both ends of the first arc-shaped limiting tube 20 and the second arc-shaped limiting tube 21 are axially fixed with an externally threaded locking plate 23 that matches the lateral locking seat 18.

[0039] The first arc-shaped limiting tube 20 and the second arc-shaped limiting tube 21 are sleeved on both sides of the support rod 9 through the arc-shaped limiting section 22 , and then threaded onto the outside of the external thread locking plate 23 through the internal threaded hole inside the lateral locking seat 18 .

[0040] The externally threaded locking plates 23 at both ends of the first arc-shaped limiting tube 20 and the second arc-shaped limiting tube 21 are assembled to form an externally threaded tube that matches the lateral locking seat 18 .

[0041] In order to improve the locking effect of the assembly surface, inner locking mechanisms 24 are staggeredly installed on the assembly surfaces of the first arc-shaped limiting tube 20 and the second arc-shaped limiting tube 21 .

[0042] The inner locking mechanism 24 includes a locking block and a locking frame fixed on the assembly surfaces of the first arc-shaped limiting tube 20 and the second arc-shaped limiting tube 21 .

[0043] In order to cooperate with lateral assembly and lifting, a side assembly frame 25 is welded and fixed to the outer surface of the first mold body 15 and the second mold body 16, and the top ends of the horizontal support rods 5 and the diagonal support rods 6 are assembled and limited with the side assembly frame 25 through lateral bolts.

[0044] In order to cooperate with the lateral assembly limit, a plurality of lateral circular assembly through holes that cooperate with the lateral locking seats 18 are opened on the outer sides of the first mold body 15 and the second mold body 16.

[0045] The lateral circular assembly through hole can be used not only to install the lateral locking seat 18 but also to inject material inward from the side.

[0046] In order to facilitate the lifting, without the need for external equipment, the lower end of the top assembly frame 12 is fixedly equipped with an overhead winch lifting device 26 for conveniently lifting the first mold body 15 and the second mold body 16.

[0047] The overhead winch hoisting device 26 is a prior art, which consists of a top-mounted winch machine and a hoisting cable wound around the outside of a winch inside the winch machine. The winch machine is hoisted by being installed on a side assembly frame 25 through the bottom of the hoisting cable.

[0048] A method for constructing a hydraulically jacked integral steel frame platform. After the foundation is constructed, the cross-sectional contour line of the pier body and the bottom is first laid out, the debris within the pier body is roughened and washed, the main reinforcement is extended, and the stirrups of the first section of the pier body are tied. The structural installation of the steel frame platform and the hydraulic jacking system is carried out simultaneously with the pier body construction, and the installation steps are carried out in a top-down order.

[0049] The steel frame platform includes a jacking frame 2 and a lower hanger 3.

[0050] The hydraulic jacking system comprises a hydraulically controlled jack 8 and a support rod 9.

[0051] After installing the outer formwork at the solid section of the pier bottom, install the lower hanger 3, jacking frame 2, jack 8, support rod 9 and hydraulic control system;

[0052] The hydraulic control system includes a horizontal support rod 5, an oblique support rod 6, and a roller support rod 7.

[0053] After the solid section concrete is poured and the concrete is strengthened for a few hours, the hydraulically controlled jack can be activated to drive the lower hanger and the jacking frame to climb to the appropriate height. Then, the steel bars and combined turnover formwork of the variable section section can be installed. The remaining layers of the inner hanger bottom plates can be stacked in sequence on the steel benches in the cavity of the variable section section of the pier body. While installing the inner square frame, the second layer of hangers under the lower hanger can be installed at the same time.

[0054] After pouring the variable cross-section concrete, wait for a few hours for the steel frame to strengthen and then lift it up 2m, then install the hanger rod of the inner hanger of the -2 layer and the outer hanger of the -3 layer;

[0055] As the segmental crushing and casting steel frame rises, the lower hangers 3 of the subsequent bottom layer are installed layer by layer, and all wind-resistant and anti-falling support rods 9 are installed. When installing the roller support rod 7, the reasonable gap between the roller and the pier body surface is adjusted by the screw.

[0056] The modular overmolding system uses the same large formwork as traditional overmolding, divided into two layers, each 2 to 3 meters high. When removing or installing the formwork, the top winch hoisting device 26 at the bottom of the top assembly frame 12 lifts the bottom layer of the formwork to remove it from the mold and raise it to the top surface of the upper layer. The surface of the formwork is then cleaned and coated with a release agent before being docked with the flange on the top surface of the upper layer of the formwork.

[0057] The selection and quantity of support rods 9 and jacks 8 should be determined according to the load distribution and structural stress conditions. The hydraulic jacking integral steel frame platform mold uses medium 76X6 steel pipes as support rods 9 and is equipped with YCW20T-100 wedge-type jacks 8. In order to prevent the occasional slippage of individual jack wedge clips, resulting in uneven structural stress, an anti-fall wedge block clamp is added to the bottom of the lower crossbeam of the jacking frame 2. Its function is to increase the lateral constraint support point of the support rod 9 and improve the stability of the support rod. In order to improve the wind resistance of the jacking frame 2 and the stability of the overall lifting process, the outer pole of the jacking frame 2 is extended to the bottom end of the lower hanger 3, and a horizontal wind-resistant roller support rod is set at its bottom end.

[0058] The lifting of jack 8 is controlled by a hydraulic control panel, which utilizes existing technology and includes an LTK2-32-10B oil pump, a 3-position, 4-way solenoid directional control valve, a pilot-operated relief valve, a 2-position, 4-way directional control valve, a programmable logic controller (PLC), and a display screen. Two modes of synchronous hydraulic lifting control are employed. One mode provides synchronous control of each jack's lifting stroke (approximately 80 mm). The hydraulic system utilizes parallel oil circuits, with each lifting jack equipped with a displacement meter. The displacement of each jack is fed back to the PLC for comparison. If the fastest-climbing jack exceeds the slowest-climbing jack by a set value, the solenoid directional control valve shuts off the oil supply to the exceeding jack until the displacements equalize, at which point oil supply is restored. To improve the jack's lifting efficiency, synchronous stroke control divides the jack's 80 mm lifting stroke into two control intervals with varying precision: a coarse adjustment of 50 mm in the first cycle and a fine adjustment of 30 mm in the last cycle. The other is the vertical displacement deviation control of the four corner points of the steel frame: the jacks 8 are grouped according to the four corner positions, and the infrared displacement sensors or rope displacement meters installed at the four corners of the jacking frame are used to synchronously measure the vertical displacement deviation values ​​of the four corner positions during the jacking process of the jacking frame and feed them back to the PLC. The grouping jacks with excessive displacement are intermittently cut off from oil to control the horizontal state of the entire steel frame.

[0059] The hydraulic jacking integral steel frame platform and its turnover mold construction method of the present invention adopt a ground support rod 9 as a fulcrum, which has low requirements on the strength of the newly poured concrete and can climb after the initial setting of the concrete, thereby shortening the construction period of the pier body segment and accelerating the construction progress; the top-mounted translation method can be used to adjust the position of the jacking and hoisting mechanism, making it more widely applicable; the combined turnover mold with a detachable structure design is not only convenient for loading and unloading operations, but also can use the internal horizontal assembly limit tube 17 to lateral support and limit the support rod 9, thereby ensuring the stability of the interior of the support rod and the mold processing, and ensuring the verticality of the jacking process; the built-in support beam 13 located above the lower anti-fall clamp 10 can be used to improve the The protection capability and safety are greatly improved; the lateral hydraulic control system can ensure the stability and safety of the assembly of the lower hanger 3 and the square steel frame; the mold turning process is adopted, the construction joint interface is uniform, the slurry stopping effect is good, the formwork and the working platform are completely separated and independent, avoiding the disturbance of the concrete by other operations on the working platform before the concrete solidifies in the traditional mold turning process, and the concrete quality is better; the frame platform and the slot positioning frame arranged on the lifting frame replace the rigid frame, that is, the operating platform for the steel bar connection operation and the better solution to the main reinforcement connection positioning problem, and save the material and installation cost of the rigid frame. The steel platform can be designed in a modular way, which is convenient for flexible combination and reuse, and the auxiliary material consumption is low.

[0060] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A hydraulic jacking integral steel frame platform turnover mold, comprising an electric hoist (1), a jacking frame (2), a lower hanger (3), a horizontal support rod (5), an oblique support rod (6), a roller support rod (7), a jack (8), a support rod (9) and a lower anti-falling clamp (10), characterized in that: The top of the jacking frame (2) is equipped with a top guide rail (11) for assembling the electric hoist (1), the inner top surface of the jacking frame (2) is equipped with a top assembly frame (12) controlled by the electric hoist (1), the upper end of the jack (8) is installed on the bottom of the top assembly frame (12) through a fixed assembly seat, the jack (8) and the lower anti-falling clamp (10) are fixed to the outside of the support rod (9) by clamping, the lower hanger (3) is fixedly equipped with a square steel frame (4) for convenient construction by operators, the inner side of the lower hanger (3) is equipped with a combined turning mold, and the inner side surface of the jacking frame (2) is located above the lower anti-falling clamp (10) and is fixedly equipped with a built-in supporting beam (13); The combined mold includes a first mold body (15), a second mold body (16), a transverse assembly limiting tube (17) that transversely passes through the first mold body (15) and the second mold body (16), and lateral locking seats (18) fixedly installed on both sides of the transverse assembly limiting tube (17); The transverse assembly limiting tube (17) comprises a first arc-shaped limiting tube (20) located on one side of the support rod (9) and a second arc-shaped limiting tube (21) located on the other side of the support rod (9); the first arc-shaped limiting tube (20) and the second arc-shaped limiting tube (21) are both provided with an integral arc-shaped limiting section (22) at the position of the support rod (9); and both ends of the first arc-shaped limiting tube (20) and the second arc-shaped limiting tube (21) are axially fixed with an external thread locking plate (23) that matches the lateral locking seat (18); An inner locking mechanism (24) is staggeredly installed on the assembly surfaces of the first arc-shaped limiting tube (20) and the second arc-shaped limiting tube (21).

2. The hydraulic jacking integral steel frame platform mold according to claim 1 is characterized by: A lateral assembly seat (14) for installing a horizontal support rod (5), an oblique support rod (6), and a roller support rod (7) is fixed on the lower hanger (3) adjacent to the building surface.

3. The hydraulic lifting integral steel frame platform mold according to claim 1 is characterized by: A turnover bottom support plate (19) is movably mounted on the inner bottom surface of the square steel frame (4) adjacent to the combined turnover mold end.

4. The hydraulic jacking integral steel frame platform mold according to claim 1 is characterized by: A side assembly frame (25) is welded and fixed on the outer sides of the first mold body (15) and the second mold body (16), and the top ends of the horizontal support rod (5) and the oblique support rod (6) are assembled and limited with the side assembly frame (25) through side bolts.

5. The hydraulic jacking integral steel frame platform mold according to claim 1 is characterized by: A plurality of side-mounted circular assembly through holes matching with the lateral locking seats (18) are provided on the outer sides of the first mold body (15) and the second mold body (16).

6. The hydraulic jacking integral steel frame platform mold according to claim 1 is characterized by: The lower end of the top assembly frame (12) is fixedly equipped with an overhead winch hoisting device (26) for conveniently hoisting the first mold body (15) and the second mold body (16).

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