Self-propelled bridge pouring working platform and construction method thereof

Abstract

The application discloses a self-propelled bridge pouring working platform and a construction method thereof, wherein the working platform comprises a pier top displacement mechanism, a bottom die horizontal displacement device, a bottom die system, a wing die system, an inner die system, an end die system, a bottom die moving platform, a hydraulic system and an electric control system and the like; the construction method comprises the following steps: S1, the bridge pouring working platform pours and cures concrete of n and n+1 pier spans, and during the period, the whole steel reinforcement cage is bound on the moving bed frame on the poured beam surface at the rear; S2, the n and n+1 pier span concrete curing and tensioning are completed, and the bridge pouring working platform completes demolding, mold opening and the like; the application has the beneficial effects that the longest binding steel process in the bridge construction can be simultaneously started with the bridge pouring, curing and tensioning processes, the construction process is simplified, and the mobile die frame beam manufacturing efficiency is effectively improved.

Description

Technical Field

[0001] This invention relates to the technical field of bridge construction equipment and methods, and in particular to a self-propelled bridge pouring platform and its construction method. Background Technology

[0002] With the rapid development of high-speed railways in my country, cast-in-place bridge construction has been widely adopted in railway bridge construction due to its advantages of eliminating the need for precast beam yards and its safety and reliability. However, according to the currently prevalent traditional cast-in-place construction method, the process of pouring a single span of a bridge mainly consists of three steps: reinforcement cage binding, concrete pouring, and concrete curing and tensioning. The cycle for completing the pouring of one span of a bridge using this three-step method is approximately 16 days, after which the three steps of the next span of a bridge can be constructed. Since all three steps require the main frame as the supporting structure for construction, the construction of the next span of a bridge cannot proceed while one step of the construction is underway. This results in long waiting times for different trades, insufficient utilization of labor, long construction periods, high construction costs, and poor economic efficiency.

[0003] In response, the applicant filed a patent application in 2017 entitled "A Method for In-situ Cast-in-place Construction of Bridges" (application number 201711187685.5). This construction method is based on a bottom-bearing movable formwork. Although this formwork can simultaneously tie the reinforcing cage and perform bridge casting and curing, its construction procedures are relatively complex and its safety is low. Therefore, our company proposes a self-propelled bridge casting work platform and its construction method, which not only has simple construction procedures and good safety, but also significantly improves construction efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a self-propelled bridge pouring platform and its construction method, which can not only carry out the steel cage binding work of the next span of the bridge while pouring and curing the bridge at one span, but also has a simple and reliable construction process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A self-propelled bridge casting platform includes a pier top displacement mechanism, a bottom formwork lateral movement device, a bottom formwork system, a wing formwork system, an inner formwork system, an end formwork system, a bottom formwork moving platform, a hydraulic system, and an electrical control system. It also includes: The main frame is pressed onto the bridge pier and can travel along the bridge pier; An elevation system set on the main framework; A steel cage lifting device located within the lifting system and capable of being lifted and moved by the lifting system; The movable tire rack located on the bridge deck.

[0006] Preferably, the main frame includes two sets of main beams that are symmetrically arranged and have the same structure. Each set of main beams includes a front guide beam with a length of half a span, a load-bearing box beam with a length of one span, and a rear guide beam with a length of one span. A connecting beam is provided between the two front guide beams.

[0007] Preferably, the lifting system includes multiple sets of lifting frames evenly distributed on the load-bearing box girder and the rear guide beam; The lifting frame includes a fixed gantry, which includes a first leg column and a second leg column respectively set on two main beams. The upper part of the first leg column is fixedly connected to one end of a crossbeam, and the other end of the crossbeam is hinged to the upper part of the second leg column. A transverse moving frame is sleeved on the crossbeam, and a transverse moving hydraulic cylinder is set between the crossbeam and the transverse moving frame. The bottom of the horizontal moving frame of the multiple lifting frames is provided with hoisting rails that are connected to each other, and hoisting devices are movably installed on the hoisting rails.

[0008] Preferably, the steel cage lifting device includes a truss longitudinal beam, with truss cantilever arms at both ends of the truss longitudinal beam, and lifting slings are provided on the lower chord of the truss longitudinal beam and the truss cantilever arms.

[0009] Preferably, the mobile tire frame includes a bottom support beam, with support frames on both sides of the bottom support beam. The bottom of the bottom support beam is also provided with a running wheel box and an adjustable support. The adjustable support includes a nut located at the bottom of the bottom support beam, with a screw screw screwed into the nut.

[0010] Preferably, the movable frame is provided with a limiting slot for positioning steel bars and a positioning bracket, and the movable frame is also provided with a temporary support for binding the top slab steel bars of the box girder.

[0011] The present invention also provides a method for constructing a self-propelled bridge using the aforementioned working platform. The construction method includes the following steps: S1. The bridge pouring work platform is used for concrete pouring and curing of piers n and n+1. During this period, the integral steel cage is tied on the mobile frame on the already poured beam surface behind it. The concrete curing and tensioning of piers S2, n, and n+1 have been completed, and the bridge pouring work platform has been demolded and opened. S3. The lifting device lifts the steel cage lifting tool, moves the steel cage lifting tool to the rear of the main frame and raises it to a high position. The bridge pouring work platform moves forward one span to reach the new beam-making position. The formwork is closed and the bridge pouring work platform is finely adjusted to reach the beam-making elevation. S4. The mobile frame loaded with the steel cage moves itself to the bottom of the steel cage lifting device; S5. The lifting system lowers the steel cage lifting device, connects the steel cage lifting device to the steel cage, and the lifting device lifts the steel cage through the steel cage lifting device and moves it forward until it enters the top of the box girder formwork to be erected. The horizontal and vertical positions of the steel cage are then finely adjusted. S6. The lifting device lowers the steel cage, and the steel cage falls into the outer formwork cavity of the working platform; S7. The inner formwork system enters the inner cavity of the steel cage in sections, and at the same time, the connection between the steel cage lifting tool and the steel cage is dismantled in sections from front to back. S8. Concrete pouring, curing, and tensioning are carried out, while the integral steel cage is tied to the movable formwork on the top surface of the already poured beam. S9. Repeat steps S1-S8 to complete the construction of the remaining spans of the bridge.

[0012] Preferably, in step S1, the moving frame is completely within the movement range of the lifting device.

[0013] Preferably, in step S3, the lifting device must ensure that all slings are under taut tension when lifting the steel cage, and at the same time, connections between the top and bottom slab reinforcements must be added at the lifting points in the cavity area of ​​the steel cage.

[0014] Preferably, the inner mold system in step S7 is a hydraulic inner mold that can autonomously contract and open, and the inner mold system has its own longitudinal movement force.

[0015] The beneficial effects of this invention are as follows: 1. It allows the most time-consuming steel bar tying process in bridge construction to be carried out simultaneously with the bridge pouring, curing and tensioning processes, while simplifying the construction process and effectively improving the efficiency of beam fabrication using mobile formwork.

[0016] 2. The main frame is two and a half spans long in the longitudinal direction of the bridge. The rear guide beam can be directly supported on the pier top without anchoring to the already poured beam wing plate. This not only makes construction convenient but also has little impact on the already poured bridge.

[0017] 3. The lifting system is evenly distributed on the load-bearing box girder and the rear guide beam, covering the length of two spans. This avoids the complex process of coordinating the lifting device and the traveling wheel box under the mobile frame to drag and feed the beam when the integral steel cage is inserted into the cavity, which is a common feature of existing technologies. It can allow the mobile frame to move the integral steel cage into place in one go, and the lifting device can lift, move longitudinally and lower the integral steel cage. The process is simple, safe and fast.

[0018] 4. When tying the entire steel cage on the mobile frame at the rear of the platform, the equipment's built-in lifting system can be used as an auxiliary tool, without the need for additional auxiliary equipment, which is efficient and economical.

[0019] 5. The lifting device covers two spans and runs directly on the fixed gantry, avoiding the need for a mobile gantry crane to lift the entire steel cage and move on the equipment wing formwork in the existing technology, thus making the construction process more stable and safer. Attached Figure Description

[0020] Figure 1This is a front view of the working platform in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the working platform of the present invention with the integral steel cage tied to the cast-in-place beam surface behind it. Figure 3 This is a cross-sectional view of the steel cage lifting device of the working platform in an embodiment of the present invention, which lifts the overall steel cage. Figure 4 This is a cross-sectional view of the steel cage lifting device of the working platform of the present invention lowering the overall steel cage into the formwork; Figure 5 This is a cross-sectional view of the working platform in the pouring state according to an embodiment of the present invention; Figure 6 This is a cross-sectional view of the working platform in the mold-opening state according to an embodiment of the present invention; Figure 7 This is a cross-sectional view of the movable tire frame in an embodiment of the present invention; Figure 8 These are the front view and top view of the main frame in this embodiment of the invention; Figure 9 This is a schematic diagram of construction procedure S1 in an embodiment of the present invention; Figure 10 This is a schematic diagram of construction procedure S3 in an embodiment of the present invention; Figure 11 This also serves as a schematic diagram of construction procedure S3 in an embodiment of the present invention. Figure 12 This is a schematic diagram of construction procedure S4 in an embodiment of the present invention; Figure 13 This is a schematic diagram of construction procedure S5 in an embodiment of the present invention; Figure 14 This is a schematic diagram of construction procedure S6 in an embodiment of the present invention; Figure 15 This is a schematic diagram of construction procedure S8 in an embodiment of the present invention.

[0021] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0022] The invention will now be further described with reference to the accompanying drawings. Example

[0023] like Figure 1 and Figure 5 , Figure 6As shown, this embodiment of a self-propelled bridge casting platform includes a pier top displacement mechanism, a bottom formwork lateral movement device, a bottom formwork system, a wing formwork system, an inner formwork system, an end formwork system, a bottom formwork moving platform, a hydraulic system, and an electrical control system. It also includes: The main frame 1 is pressed onto the pier and can travel along the pier; the lifting system 2 is set on the main frame 1; the steel cage lifting device 3 is located in the lifting system 2 and can be lifted and moved by the lifting system 2; and the movable frame 4 is located on the bridge deck.

[0024] like Figure 8 As shown, the main frame 1 includes two sets of main beams arranged symmetrically and with identical structures. Each set of main beams includes a half-span front guide beam 1a, a one-span load-bearing box beam 1b, and a one-span rear guide beam 1c. A connecting beam is provided between the two front guide beams 1a. The overall length of the main frame 1 along the longitudinal direction of the bridge is two and a half spans. This not only ensures that the entire steel cage is in a simply supported state during transportation, resulting in good stress distribution, but also simplifies and speeds up the transportation process.

[0025] like Figure 2 As shown, the lifting system 2 includes multiple lifting frames evenly distributed on the load-bearing box girder 1b and the rear guide beam 1c; The lifting frame includes a fixed gantry 2a, which comprises a first leg column 2a-1 and a second leg column 2a-2 respectively mounted on two main beams. The bottoms of both the first leg column 2a-1 and the second leg column 2a-2 are pin-connected to the centroid of the main frame 1 (load-bearing box girder 1b or rear guide beam 1c) at their respective locations, thereby preventing the lifting system 2 from generating additional torque on the main frame 1. The upper part of the first leg column 2a-1 is fixedly connected to one end of a crossbeam 2a-3, which in this embodiment is a bolt connection. The other end of the crossbeam 2a-3 is hinged to the upper part of the second leg column 2a-2. In this embodiment, two... A pin 2a-4 is connected, and a large clearance fit is used between the pin 2a-4 and the pin hole to allow the crossbeam 2a-3 and the second support column 2a-2 to rotate slightly at a certain angle to adapt to the lateral mold opening of the working platform; a transverse frame 2d-1 is fitted on the crossbeam 2a-3, and a transverse cylinder 2d-2 is set between the crossbeam 2a-3 and the transverse frame 2d-1. The transverse cylinder 2d-2 is connected to the crossbeam 2a-3 and the transverse frame 2d-1 by hinge. The transverse frame 2d-1 can carry the lifting device 2b and its lifted load to move laterally on the crossbeam 2a-3 through the extension and retraction of the transverse cylinder 2d-2; The bottom of the transverse frame 2d-1 of the multiple lifting frames is provided with hoisting rails 2c that are connected to each other. In this embodiment, the hoisting rails 2c are made of rolled I-beams and bolted to the bottom of the transverse frame 2d-1. A hoisting device 2b is movably provided on the hoisting rails 2c. In this embodiment, the hoisting device 2b is an electric hoist. Multiple electric hoists are provided and can move along the hoisting rails 2c. The moving distance covers the range of the load-bearing box beam 1b and the rear guide beam 1c of the main frame 1.

[0026] like Figure 3 As shown, the steel cage lifting device 3 includes a truss longitudinal beam 3a. For ease of transportation, the truss longitudinal beam 3a is divided into several short sections, which are connected by bolts. The top of the truss longitudinal beam 3a is provided with lifting lugs for connection with the hook of the lifting device 2b. The two ends of the truss longitudinal beam 3a are connected by bolts to truss cantilever arms 3b, forming a truss plane that can basically cover the top surface of the bridge. Lifting cables 3c are provided on the lower chord of the truss longitudinal beam 3a and the truss cantilever arms 3b, which can be used to lift the tied steel cage.

[0027] like Figure 7 As shown, the movable frame 4 includes a bottom support beam 4a. Support frames 4b, which are identical to the support frames for the web and flange reinforcements, are provided on both sides of the bottom support beam 4a. The bottom support beam 4a and the support frames 4b are connected by bolts, forming an external outline structure of a bridge in the cross-section, serving as external support for the reinforcement cage binding. The bottom of the bottom support beam 4a also includes a traveling wheel box 4c and an adjustable support 4d. The traveling wheel box 4c is bolted to the bottom of the bottom support beam 4a, serving as the intermediate support point for the bottom support beam 4a. The traveling wheel box 4c is driven by a motor reducer and can carry the reinforcement cage longitudinally. The adjustable support 4d includes a nut located at the bottom of the bottom support beam 4a, with a screw threaded into the nut, fixed to both sides of the bottom support beam 4a, serving as the external support point for the bottom support beam 4a.

[0028] The mobile frame 4 is equipped with a limiting slot and a positioning bracket (not shown in the figure) for positioning the reinforcing bars to position various types of reinforcing bars and ensure that the line shape and spacing of the reinforcing bar cage meet the requirements. After the bottom plate and side plate reinforcing bars of the reinforcing cage are tied, several temporary supports 6 are also required in the mobile frame for tying the top plate reinforcing bars of the box girder. These temporary supports 6 are only used for support during the binding of the reinforcing bars and can be removed and reused after the overall reinforcing cage is tied.

[0029] The present invention also provides a method for constructing a self-propelled bridge using the aforementioned working platform. The construction method includes the following steps: S1, such as Figure 5 and Figure 9As shown, the bridge pouring platform is used for concrete pouring and curing at piers n and n+1. During this period, the integral steel cage is tied on the mobile frame 4 on the already poured beam surface behind it. At this time, the mobile frame 4 is completely within the range of the longitudinal bridge movement of the lifting device 2b. The lifting device 2b can be used as an auxiliary tool for tying steel bars, saving manpower and increasing efficiency. S2, such as Figure 6 As shown, the concrete curing and tensioning of piers n and n+1 are completed, and the bridge pouring platform is demolded and opened. During the pouring process, the inner mold system 5 opens to form a support, and when demolded, the inner mold system 5 contracts, allowing it to move forward along the poured bridge in order to pour the next span of the bridge.

[0030] S3, such as Figure 10 and Figure 11 As shown, lifting device 2b lifts the steel cage lifting tool 3, moving it to the tail of the main frame 1 and raising it to a high position. The bridge pouring platform moves forward one span to the new beam-making position. The formwork is closed and the bridge pouring platform is finely adjusted to reach the beam-making elevation. Before lifting the steel cage, the tension of the slings 3c in the steel cage lifting tool 3 needs to be adjusted in advance to ensure that all slings 3c are taut and under tension before the overall lifting. At the same time, it is necessary to add connections between the top and bottom plate steel bars at the lifting points in the cavity area of ​​the overall steel cage to avoid local steel bar deformation during the lifting process. After the lifting is completed, these connections need to be removed to allow the inner formwork to enter and pour the concrete. S4, such as Figure 12 As shown, the mobile frame 4, loaded with the tied steel cage, moves itself to below the steel cage lifting device 3; S5, such as Figure 13 As shown, the lifting system 2 lowers the steel cage lifting device 3 and connects the steel cage lifting device 3 to the steel cage. The lifting device 2b lifts the steel cage through the steel cage lifting device 3 and moves forward until it enters the top of the box girder formwork to be erected, and finely adjusts the horizontal and vertical positions of the steel cage. S6, such as Figure 4 and Figure 14 As shown, the lifting device lowers the steel cage, and the steel cage falls into the outer formwork cavity of the working platform; S7, such as Figure 5 and Figure 6 As shown, the inner formwork system 5 enters the inner cavity of the reinforcing cage in sections when it is in a contracted state. After entering, it opens to prepare for pouring. At the same time, the connection between the reinforcing cage lifting device 3 and the reinforcing cage is dismantled in sections from front to back. The inner formwork system 5 is a hydraulic inner formwork that can autonomously contract and open the formwork. It also has its own longitudinal movement power, making construction faster.

[0031] S8, such as Figure 15 As shown, the concrete is poured, cured, and tensioned, while the entire steel reinforcement cage is tied to the movable frame on the top surface of the already poured beam behind it. S9. Repeat steps S1-S8 to complete the construction of the remaining spans of the bridge.

[0032] This embodiment uses the aforementioned work platform and combines it with the above construction plan. The original construction procedures are reasonably arranged and carried out concurrently, while avoiding high-risk construction procedures. This improves construction safety and efficiency, saves time, and reduces construction costs. Its economic and social benefits are self-evident.

[0033] This embodiment does not impose any limitation on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0035] If the terms "first" or "second" are used in this document to define components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing the invention and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-propelled bridge casting platform, comprising a pier top displacement mechanism, a bottom formwork lateral movement device, a bottom formwork system, a wing formwork system, an inner formwork system, an end formwork system, a bottom formwork moving platform, a hydraulic system, and an electrical control system, characterized in that, Also includes: The main frame is pressed onto the bridge pier and can travel along the bridge pier; An elevation system set on the main framework; A steel cage lifting device located within the lifting system and capable of being lifted and moved by the lifting system; The movable tire rack located on the bridge deck; The main frame includes two sets of main beams that are symmetrically arranged and have the same structure. Each set of main beams includes a front guide beam with a length of half a span, a load-bearing box beam with a length of one span, and a rear guide beam with a length of one span. A connecting beam is provided between the two front guide beams. The lifting system includes multiple sets of lifting frames evenly distributed on the load-bearing box girder and the rear guide beam; The lifting frame includes a fixed gantry, which includes a first leg column and a second leg column respectively set on two main beams. The upper part of the first leg column is fixedly connected to one end of a crossbeam, and the other end of the crossbeam is hinged to the upper part of the second leg column. A transverse moving frame is sleeved on the crossbeam, and a transverse moving hydraulic cylinder is set between the crossbeam and the transverse moving frame. The bottom of the transverse frame of the multiple sets of lifting frames is provided with hoisting rails that are connected to each other, and hoisting devices are movably installed on the hoisting rails. The mobile frame includes a bottom support beam with support frames on both sides. The bottom of the bottom support beam also has a wheel box and an adjustable support. The adjustable support includes a nut located at the bottom of the bottom support beam, with a screw screw screwed into the nut.

2. The self-propelled bridge pouring platform according to claim 1, characterized in that, The steel cage lifting device includes a truss longitudinal beam, with truss cantilever arms at both ends of the truss longitudinal beam, and lifting slings are installed on the lower chord of the truss longitudinal beam and the truss cantilever arms.

3. The self-propelled bridge pouring platform according to claim 1, characterized in that, The mobile frame is equipped with a positioning groove and a positioning bracket for positioning steel bars, and a temporary support for binding the top slab steel bars of the box girder is also provided inside the mobile frame.

4. A method for constructing a self-propelled bridge by casting concrete, characterized in that, Using the work platform according to any one of claims 1-3, the construction method includes the following steps: S1. The bridge pouring work platform is used for concrete pouring and curing of piers n and n+1. During this period, the integral steel cage is tied on the mobile frame on the already poured beam surface behind it. The concrete curing and tensioning of piers S2, n, and n+1 have been completed, and the bridge pouring work platform has been demolded and opened. S3. The lifting device lifts the steel cage lifting tool, moves the steel cage lifting tool to the rear of the main frame and raises it to a high position. The bridge pouring work platform moves forward one span to reach the new beam-making position. The formwork is closed and the bridge pouring work platform is finely adjusted to reach the beam-making elevation. S4. The mobile frame loaded with the steel cage moves itself to the bottom of the steel cage lifting device; S5. The lifting system lowers the steel cage lifting device, connects the steel cage lifting device to the steel cage, and the lifting device lifts the steel cage through the steel cage lifting device and moves it forward until it enters the top of the box girder formwork to be erected. The horizontal and vertical positions of the steel cage are then finely adjusted. S6. The lifting device lowers the steel cage, and the steel cage falls into the outer formwork cavity of the working platform; S7. The inner formwork system enters the inner cavity of the steel cage in sections, and at the same time, the connection between the steel cage lifting tool and the steel cage is dismantled in sections from front to back. S8. Concrete pouring, curing, and tensioning are carried out, while the integral steel cage is tied to the movable formwork on the top surface of the already poured beam. S9. Repeat steps S1-S8 to complete the construction of the remaining spans of the bridge.

5. The self-propelled bridge casting construction method according to claim 4, characterized in that, In step S1, the moving frame is completely within the movement range of the lifting device.

6. The self-propelled bridge casting construction method according to claim 4, characterized in that, In step S3, when lifting the steel cage, the lifting device must ensure that all slings are under taut tension, and at the same time, connections between the top and bottom slab steel bars must be added at the lifting points in the cavity area of ​​the steel cage.

7. The self-propelled bridge casting construction method according to claim 4, characterized in that, The inner mold system in step S7 is a hydraulic inner mold that can autonomously contract and open, and the inner mold system has its own longitudinal movement force.

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