A portal jacking high-position beam falling construction device

Abstract

The utility model discloses a door type lifting frame high -position beam -lowering construction device relates to bridge construction technical field, including two groups of portal frame system, two groups of portal frame system are located box girder both ends respectively, every group portal frame system includes bridge pier, and the left and right sides of bridge pier are provided with lifting frame foundation respectively, and the beam support is fixedly arranged on lifting frame foundation, and the beam support top is crossed with bailey load -bearing beam, and bailey load -bearing beam with beam support is fixedly connected through distribution beam, bailey load -bearing beam is connected with box girder through beam -lowering system, and the box girder end face is located in the middle of beam -lowering support. The utility model discloses a door type lifting frame high -position beam -lowering construction device, avoids the restriction of the road below, realizes the beam body posture stable, guarantees beam -lowering construction safety controllable, and is more applicable to the complex structure such as small curve, special-shaped beam and the construction scene of limited construction space.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a portal lifting frame high-position beam lowering construction device. Background Technology

[0002] In some overpass construction projects, such as the Qitang Interchange crossing the Shanghai-Hangzhou Expressway in the Qianjiang Channel North Connection Project, the Shanghai-Hangzhou Expressway has eight lanes in both directions and a daily traffic flow of over 100,000 vehicles. Construction requires multiple traffic diversions, and work cannot be carried out at night. A high-level cast-in-place beam lowering technique was adopted. First, the box girder was cast in place at a position higher than the design elevation, and then synchronous jacking technology was used to lower the box girder to the design elevation. This allows construction to proceed without disrupting traffic, ensuring normal traffic flow and improving construction safety.

[0003] When site conditions limit the ability to set up a precast area, cast-in-place beam construction becomes the inevitable choice. However, if multiple work faces are used for simultaneous construction within a beam segment, insufficient operating space will result in the tensioning of prestressed steel strands after the last beam section between adjacent work faces has been poured. In this case, raising the last beam section several meters and casting it in place at a higher position, then lowering it to the designed position after the beam is poured and the prestressed steel strands are tensioned—this high-position beam lowering technique—can effectively solve this problem.

[0004] Traditional bridge erection methods, such as precast beam erection, may not be feasible in certain special circumstances, such as lines with very small curve radii, where bridge erection machines cannot be used. In such cases, the construction method of using scaffolding for on-site casting combined with high-level beam placement becomes a viable option. It can adapt to various complex terrains and line conditions, offering greater flexibility and adaptability.

[0005] Prior art, disclosed in CN222685272U, is a Bailey bridge integral beam lowering device. This device includes a suspension mechanism and a power mechanism mounted on the bridge deck. The suspension mechanism includes columns, a fixed crossbeam connected between two columns, a suspender rod passing through and connected to the fixed crossbeam, and a movable crossbeam located below the fixed crossbeam and connected to the suspender rod. The power mechanism includes at least one lifting mechanism mounted on the bridge deck, the output end of which abuts against the movable crossbeam. The suspender rod passes through the bridge deck and connects to the Bailey bridge. However, this prior art suspension mechanism on the bridge deck cannot be used in situations with limited site conditions. Utility Model Content

[0006] The purpose of this invention is to provide a portal frame high-position beam lowering construction device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides a portal frame high-position beam lowering construction device, including two sets of portal frame systems, with the two sets of portal frame systems located at both ends of the box girder respectively; Each group of the gantry system includes a pier, and a lifting frame foundation is set on the left and right sides of the pier. A beam-dropping support is fixedly set on each lifting frame foundation. A Bailey load-bearing beam spans above the beam-dropping support. The Bailey load-bearing beam and the beam-dropping support are fixedly connected by a distribution beam. The Bailey load-bearing beam is connected to the box girder via a beam-dropping system, with the end face of the box girder located in the middle of the beam-dropping support.

[0008] Preferably, the lifting frame foundation is a boss shape, with an enlarged foundation on the lower side and a foundation platform on the upper side, and the foundation platform is pre-embedded with steel plates or precision-rolled threaded steel bars.

[0009] Preferably, the beam support includes four support columns, and a connection system is provided between the four support columns.

[0010] Preferably, the support pole is made of steel pipe, the connection system is Z-shaped, and the connection system is made of channel steel.

[0011] Preferably, the distribution beam includes a crossbeam and a first longitudinal beam, the first longitudinal beam being disposed above the crossbeam, and the first longitudinal beam being welded to the crossbeam, and the crossbeam being welded to the support upright.

[0012] Preferably, the Bailey load-bearing beam comprises three sets of Bailey panels arranged in parallel, with each set of Bailey panels connected by threaded steel bars.

[0013] Preferably, the beam lowering system includes two sets of jacks and two lifting rods, and the two sets of jacks are respectively connected to the lifting rods. The two sets of jacks and the two lifting rods are arranged alternately, and each jack and the lifting rod is provided with a nut. The suspension rod is inserted between the two sets of Bailey panels and matches the position of the pre-reserved hoisting hole of the box girder; A second longitudinal beam is provided between the beam lowering system and the Bailey load-bearing beam. Steel plates are provided between the jack and the second longitudinal beam, between the jack and the nut, and between the nut and the second longitudinal beam.

[0014] Preferably, the beam lowering system is provided in two sets, corresponding to the two sets of the gantry system respectively, and the two sets of beam lowering systems are arranged symmetrically.

[0015] Preferably, the suspension rod is made of precision-rolled threaded steel bar, and the crossbeam, the first longitudinal beam, and the second longitudinal beam are all made of I-beams.

[0016] Preferably, a safety support is provided between the box girder and the pier, the safety support is constructed of steel or square timber, and a support is installed on the top of the pier.

[0017] Therefore, the above-mentioned portal frame high-level beam lowering construction device has the following beneficial effects: (1) The “hollow” structure of the portal frame can avoid the restrictions of the existing road below and realize beam dropping construction under unfavorable space conditions. It is more suitable for complex structures such as small curves and irregular beams, as well as construction scenarios with limited construction space.

[0018] (2) The foundation area of ​​the lifting frame is small, and there is no need to harden the ground below on a large scale, which is conducive to cost control.

[0019] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the gantry system structure of an embodiment of a gantry lifting frame high-position beam lowering construction device of this utility model; Figure 2 This is a structural schematic diagram of an embodiment of a portal lifting frame high-position beam lowering construction device of this utility model; Figure 3 This is a schematic diagram of the foundation structure of a portal frame lifting frame for high-level beam lowering construction, according to an embodiment of the present invention. Figure 4 This is a top view of the lifting frame foundation of an embodiment of a portal lifting frame high-position beam lowering construction device of this utility model; Figure 5 This is a schematic diagram of a safety support pier for an embodiment of a portal lifting frame high-position beam lowering construction device of this utility model; Figure 6 This is a schematic cross-sectional view of the bridge pier of an embodiment of a portal lifting frame high-position beam lowering construction device of this utility model; Figure 7 This is a schematic diagram of the longitudinal section of the box girder between bridge piers in an embodiment of a portal lifting frame high-position beam lowering construction device of this utility model; Figure 8 This is a partial enlarged view of an embodiment of a portal frame high-position beam lowering construction device of this utility model; Figure 9 This is a schematic diagram of the beam lowering system structure of an embodiment of a portal lifting frame high-position beam lowering construction device of this utility model; Figure 10 This is a construction flowchart of an embodiment of a portal frame high-position beam lowering construction device of this utility model; Figure 11These are renderings of the left and right lines of the Hualong Station extra-large bridge, representing an embodiment of the portal frame high-position beam lowering construction device of this utility model. Attached reference numerals: 1. Lifting frame foundation; 11. Foundation cap; 12. Spread foundation; 13. High-strength threaded steel bar; 2. Beam lowering support; 21. Support upright; 22. Connection system; 3. Distribution beam; 31. Crossbeam; 32. Longitudinal beam one; 4. Bailey load-bearing beam; 41. Bailey panel; 6. Beam lowering system; 61. Jack; 62. Hanger rod; 63. Longitudinal beam two; 64. Steel plate; 65. Nut; 66. Steel anchor; 7. Safety pier; 8. Box girder; 9. Support; 10. Pier. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Example Please see Figures 1-11 This utility model provides a portal lifting frame high-level beam lowering construction device, including two sets of portal frame systems, which are located at both ends of the box girder 8.

[0024] Each gantry system includes piers 10, with lifting frame foundations 1 on both the left and right sides of each pier 10. A beam-dropping support 2 is fixedly mounted on each lifting frame foundation 1, and a Bailey bridge load-bearing beam 4 spans above the beam-dropping support 2. The Bailey bridge load-bearing beam 4 and the beam-dropping support 2 are fixedly connected via distribution beams 3. This forms a "hollow" structure for the gantry frame, allowing for beam-dropping construction to avoid existing roads below and enabling construction under unfavorable spatial conditions.

[0025] The Bailey load-bearing beam 4 is connected to the box girder 8 through the beam dropping system 6, and the end face of the box girder 8 is located in the middle of the beam dropping support 2.

[0026] The lifting frame foundation 1 is shaped like a boss, with a 580cm×480cm×40cm thick reinforced concrete spread foundation 12 on the lower side, using C25 concrete. The upper side is a foundation platform 11, with dimensions of 420cm×380cm×80cm. The gantry frame foundation has a relatively small area, eliminating the need for extensive hardening of the ground below, which is beneficial for cost control.

[0027] The lifting frame foundation 1 is reinforced with steel bars according to structural requirements. The lifting frame foundation 1 and the beam support 2 can be connected by pre-embedded steel plates or pre-embedded Φ20 precision-rolled threaded steel bars. When using pre-embedded steel plates, the beam support 2 and the pre-embedded steel plates are connected by welds to increase the connection strength between them. When using pre-embedded Φ20 precision-rolled threaded steel bars, double-nut bolts are used. In this embodiment, Φ20 precision-rolled threaded steel bars are pre-embedded on the foundation cap 11.

[0028] The beam support 2 includes four support poles 21, and a connection system 22 is provided between the four support poles 21.

[0029] The support column 21 is made of Φ609×16mm steel pipe. The support column 21 is bolted firmly to the Φ20 precision rolled threaded steel pre-embedded in the foundation pedestal 11, and double nuts are used for bolting.

[0030] The connection system 22 is Z-shaped, and the transverse, longitudinal and diagonal supports of the connection system 22 are all made of 16a channel steel.

[0031] The distribution beam 3 includes a crossbeam 31 and a longitudinal beam 32. The longitudinal beam 32 is positioned above the crossbeam 31. The crossbeam 31 uses two sets of three-section I45a I-beams, and the longitudinal beam 32 uses one set of four-section I45a I-beams. Stiffening ribs and gusset plates are used for reinforcement to ensure local stability. The longitudinal beam 32 is welded to the crossbeam 31, and the crossbeam 31 is welded to the support upright 21. Each layer of distribution beam 3 must be tightly fitted and welded to the lower layer of steel structure. During construction, uneven areas of the distribution beam 3 are leveled with thin steel plates to ensure that the distribution beam 3 is flat.

[0032] A Bailey bridge load-bearing beam 4 is installed above the distribution beam 3. The Bailey bridge load-bearing beam 4 includes three sets of Bailey bridge sections 41 arranged in parallel. The Bailey bridge sections 41 are standard type 321 Bailey bridge sections with dimensions of 3000mm × 1500mm. Each set of Bailey bridge sections 41 is laterally connected by Φ22 threaded steel bars to ensure the stability of the Bailey bridge sections.

[0033] There are two sets of beam lowering system 6, which are set in the two sets of gantry systems respectively, and the two sets of beam lowering system 6 are set symmetrically.

[0034] Each beam lowering system 6 consists of two sets of jacks 61 and four hangers 62. Jacks 61 are threaded through two hangers 62, while the other two hangers 62 are set independently. The two hangers 62 with jacks 61 threaded through them are staggered with the two hangers 62 without jacks 61 threaded through them to avoid unilateral stress. Nuts 65 are set on both jacks 61 and hangers 62.

[0035] Therefore, this embodiment uses two sets of gantry systems, with a total of 8 hangers 62 and 4 jacks for each box girder 8. By utilizing symmetrically arranged hydraulic jacks and precisely controlling the jack stroke through nuts 65, single-point stress is avoided, significantly reducing the risk of beam overturning.

[0036] The hanger 62 is positioned between the two sets of Bailey panels 41 and matches the position of the pre-reserved hoisting hole of the box girder 8. After the hanger 62 passes through the pre-reserved hoisting hole, it is anchored at the bottom of the box girder 8 by steel anchor 66.

[0037] The lifting capacity of jack 61 is not less than 1.5 times the design load, with a stroke of 19cm. In this embodiment, a 500-ton jack is selected. The lifting rod 62 is made of Φ50 precision-rolled threaded steel bar and Φ15.2mm steel strand.

[0038] A second longitudinal beam 63 is installed between the lowering beam system 6 and the Bailey load-bearing beam 4. The second longitudinal beam 63 is made of two sets of three-section I56a I-beams. Two to three 4cm thick steel plates 64 are installed between the jack 61 and the second longitudinal beam 63, between the jack 61 and the nut 65, and between the nut 65 and the second longitudinal beam 63.

[0039] A safety support pier 7 is installed between the box girder 8 and the pier 10. The safety support pier 7 can be constructed of steel or square timber, and a steel pad is installed on its top within a single drop height range (10cm). A support 9 is installed on the top of the pier 10.

[0040] The box girder 8's lowering jacks 61 at both ends should be connected in parallel using a single-pump, double-jack configuration, with a shut-off valve installed on each jack 61. This shut-off valve, along with the valve on the oil pump, will provide dual control over the lowering process. After the box girder jacks 61 are installed, the box girder 8 should be raised 5-10 cm and held for half an hour to check the load-bearing capacity and operational status of the lowering device.

[0041] When using it, the steps are as follows: (1) After the beam lowering device is inspected and approved, the safety support 7 is pressed against the bottom of the beam, and then the remaining beam cast-in-place supports and formwork are removed from the middle of the span to both ends.

[0042] (2) The two ends of the beam should be lowered alternately, and the drop height of each end should not exceed 100mm each time, so as to ensure that the height difference between the two ends of the beam is not greater than 50mm. During the beam lowering process, the safety support 7 should be lowered in time, and the distance between the top surface of the safety support 7 and the bottom surface of the beam should always be not greater than 20mm. After one end of the beam is firmly supported on the safety support 7 and the hydraulic circuit of the jack at that end is locked, the other end of the beam can be lowered.

[0043] (3) When the jack 61 retracts to 80% of its maximum stroke, the beam lowering operation should be suspended and the oil circuit locked. After the safety support 7 is lowered by about one jack stroke height, the height of the safety support 7 should be readjusted, and the beam lowering operation should be carried out in accordance with the above method.

[0044] (4) After the beam is lowered to the installation height of the support 9, the beam lowering operation should be stopped, the oil circuit of the jack 61 should be locked, and then the safety support 7 should be removed.

[0045] Specific implementation examples: The left and right line bridges of the Xi'an-Chengdu Railway Hualong Station are designed as prestressed single-track simply supported beams between piers 13 and 19 (Xining Platform) on the left line and piers 13 and 14 on the right line. The railway is of Class I grade and is designed with ballasted track. The maximum design speed for passenger trains is 200 km / h and the design speed for freight trains is 120 km / h.

[0046] Since both the major and minor mileage sections are continuous beam construction locations, in-situ casting is not possible. Instead, the beams are cast on elevated supports and then installed at their designed positions using a drop-beam method. The strength, rigidity, and stability of this drop-beam device meet the design requirements.

[0047] Therefore, this utility model employs a portal-type lifting frame high-level beam lowering construction device, which is more suitable for complex structures such as small curves and irregularly shaped beams, as well as construction scenarios with limited construction space, compared to traditional beam lowering construction methods. By using a step-by-step approach of "high-level prefabrication + low-level placement," it avoids the limitations of existing roads below, and simultaneously utilizes synchronous control technology to achieve beam posture stability, ultimately ensuring that the beam lowering construction is safe and controllable.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A portal lifting frame high-level beam lowering construction device, characterized in that: It includes two sets of gantry systems, which are respectively installed at both ends of the box girder; Each group of the gantry system includes a pier, and a lifting frame foundation is set on the left and right sides of the pier. A beam-dropping support is fixedly set on each lifting frame foundation. A Bailey load-bearing beam spans above the beam-dropping support. The Bailey load-bearing beam and the beam-dropping support are fixedly connected by a distribution beam. The Bailey load-bearing beam is connected to the box girder via a beam-dropping system, with the end face of the box girder located in the middle of the beam-dropping support.

2. The portal lifting frame high-level beam lowering construction device according to claim 1, characterized in that: The lifting frame foundation is shaped like a boss, with an enlarged foundation on the lower side and a foundation platform on the upper side. The foundation platform is pre-embedded with steel plates or precision-rolled threaded steel bars.

3. The portal lifting frame high-level beam lowering construction device according to claim 2, characterized in that: The beam-dropping support includes four support columns, and a connection system is provided between the four support columns.

4. The portal lifting frame high-level beam lowering construction device according to claim 3, characterized in that: The support pole is made of steel pipe, the connection system is Z-shaped, and the connection system is made of channel steel.

5. A portal lifting frame high-level beam lowering construction device according to claim 3, characterized in that: The distribution beam includes a crossbeam and a first longitudinal beam. The first longitudinal beam is located above the crossbeam, and the first longitudinal beam is welded to the crossbeam, and the crossbeam is welded to the support column.

6. A portal lifting frame high-level beam lowering construction device according to claim 5, characterized in that: The Bailey load-bearing beam comprises three sets of Bailey panels arranged in parallel, with each set of Bailey panels connected by threaded steel bars.

7. A portal lifting frame high-level beam lowering construction device according to claim 6, characterized in that: The beam lowering system includes two sets of jacks and two lifting rods, and the two sets of jacks are also respectively connected to the lifting rods. The two sets of jacks and the two lifting rods are arranged alternately, and each jack and the lifting rod is equipped with a nut. The suspension rod is inserted between the two sets of Bailey panels and matches the position of the pre-reserved hoisting hole of the box girder; A second longitudinal beam is provided between the beam lowering system and the Bailey load-bearing beam. Steel plates are provided between the jack and the second longitudinal beam, between the jack and the nut, and between the nut and the second longitudinal beam.

8. A portal lifting frame high-level beam lowering construction device according to claim 7, characterized in that: The beam lowering system consists of two sets, each corresponding to one of the two sets of the gantry system, and the two sets of beam lowering systems are arranged symmetrically.

9. A portal frame high-position beam lowering construction device according to claim 8, characterized in that: The suspension rod is made of precision-rolled threaded steel bars, and the crossbeam, the first longitudinal beam, and the second longitudinal beam are all made of I-beams.

10. A portal lifting frame high-level beam lowering construction device according to claim 8, characterized in that: A safety support is provided between the box girder and the pier. The safety support is constructed of steel or square timber, and a support is installed on the top of the pier.

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