Three-way temporary restraining device for tower beam of I-shaped steel-concrete composite beam cable-stayed bridge

Abstract

The utility model discloses a three-way temporary restraining device for a tower beam of an I-shaped steel concrete superposed beam cable-stayed bridge, which comprises a vertical temporary restraining part, a longitudinal temporary restraining part and a transverse temporary restraining part, the vertical temporary restraint comprises a plurality of anchoring cushion stones arranged on a lower cross beam of the cable bent tower, vertical lifting cushions supported between the anchoring cushion stones and the steel beams and prestressed steel beams for anchoring the lower cross beam and the steel beams into a whole, and the prestressed steel beams penetrate through the anchoring cushion stones; the longitudinal temporary restraint comprises a seamless steel pipe for connecting the bottom of the steel beam and the lower cross beam into a whole in the longitudinal direction, and the transverse temporary restraint comprises limiting profile steel which is fixedly connected with an embedded part on a bridge deck on the top of the steel beam and an embedded part at the tower column. The utility model has the characteristics of simple on-site construction operation, high construction efficiency, low safety risk and high economic benefit.

Description

Technical Field

[0001] The utility model relates to the technical field of steel-concrete composite beam cable-stayed bridge construction, and more specifically, to a three-way temporary restraint device for a tower beam of an I-beam composite beam cable-stayed bridge. Background Art

[0002] As a new type of bridge structure that has emerged in recent years, steel-concrete composite beam cable-stayed bridges have become a popular choice for long-span bridges due to their ability to improve the spanning capacity of cable-stayed bridges and fully utilize the tensile properties of steel and the compressive properties of concrete. However, under mountainous terrain conditions, transportation conditions are inconvenient, so I-beam steel-concrete composite beam cable-stayed bridges, which can be transported in parts, assembled on site, and use less steel, have become the mainstream of large bridge construction across high mountain valleys.

[0003] In the construction of steel-concrete composite cable-stayed bridges, the main beams are often assembled using a cantilever process, so there will be unbalanced loads in the structural system. Unbalanced loads include unbalanced bending moments, unbalanced horizontal forces, and unbalanced vertical pressures. These unbalanced bending moments and unbalanced vertical pressures are mainly generated by the deadweight of the beam, construction loads, and cable forces. The unbalanced horizontal forces are mainly generated by the cable forces of the cables. During the construction of cable-stayed bridges, under the action of unbalanced loads, the main beam structure may drift longitudinally or lateral, become unstable, or even overturn, causing serious safety problems.

[0004] In order to solve the problem of unbalanced forces generated by the structure's deadweight, wind load, temperature load, construction load, etc. during the entire construction period, and to ensure the structural safety of the main beam during the entire cantilever assembly construction period, certain measures must be taken to temporarily restrain and consolidate the main beam and the cable tower, so as to resist the effects of unbalanced loads on the cantilever structure during the construction process.

[0005] I-beam composite composite cable-stayed bridges are usually assembled on site in pieces, with a long construction period and high safety risks. After the construction of block 0 is completed, the tower beam needs to be temporarily restrained quickly before entering the cantilever assembly section. Therefore, the temporary restraint device for the tower beam must be simple and fast to construct and operate, provided that it meets the force requirements after calculation and analysis. Utility Model Content

[0006] One purpose of the utility model is to provide a three-way temporary restraint device for a tower beam of an I-beam composite cable-stayed bridge, which has the characteristics of simple on-site construction operation, high construction efficiency, low safety risk and high economic benefit.

[0007] In order to solve the above technical problems, the utility model provides a three-way temporary restraint device for the tower beam of an I-beam hybrid composite cable-stayed bridge, including a vertical temporary restraint, a longitudinal temporary restraint and a transverse temporary restraint. The vertical temporary restraint includes a plurality of anchoring pads arranged on the lower crossbeam of the cable tower, a vertical pad supported between the anchoring pad and the steel beam, and a prestressed steel bundle anchoring the lower crossbeam and the steel beam as a whole, the prestressed steel bundle passes through the anchoring pad, the longitudinal temporary restraint includes a seamless steel pipe connecting the bottom of the steel beam and the lower crossbeam as a whole along the longitudinal direction, and the transverse temporary restraint includes a limiting steel, which is fixedly connected to the embedded parts on the bridge deck at the top of the steel beam and the embedded parts at the tower column respectively.

[0008] Preferably, four anchoring pads are provided and are symmetrically distributed on the lower crossbeam of the cable tower in the transverse and longitudinal directions.

[0009] Preferably, a reserved hole is provided in the steel beam, and the prestressed steel bundle passes through the reserved hole of the steel beam and is anchored by a prestressed anchor plate; corrugated pipes are pre-embedded in the lower cross beam and the anchoring pad stone, and the prestressed steel bundle passes through the pre-embedded corrugated pipe and is anchored by a fixed end anchor provided on the lower cross beam.

[0010] Preferably, a lower cross beam permanent damper ear seat is provided on the anchoring pad stone, a steel beam bottom permanent damper ear seat is provided on the bottom surface of the steel beam, and both ends of the seamless steel pipe are respectively connected to the lower cross beam permanent damper ear seat and the steel beam bottom permanent damper ear seat through pins.

[0011] Preferably, the transverse temporary restraint also includes transverse corbels, which are respectively fixedly connected to the bottom surface of the steel beam and the anchor pad stone.

[0012] The utility model at least has the following beneficial effects:

[0013] (1) The device and construction safety risks of the utility model are low: the unbalanced force problem generated during the construction period is solved, and the structural safety of the main beam during the entire cantilever assembly construction period is ensured.

[0014] (2) The on-site construction operation of the device of the utility model is simple and the construction efficiency is high: after the 0# block is assembled, the construction work of the three-way temporary constraint of the tower beam can be quickly completed, so as to carry out the next step of cantilever assembly structure.

[0015] (3) The device of the utility model has high economic benefits: it utilizes part of the permanent structure and has low cost.

[0016] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of the front elevation of the device of the utility model;

[0018] Figure 2 It is a side elevation schematic diagram of the device of the utility model;

[0019] Figure 3 It is a plan view of the device of the utility model.

[0020] Description of reference numerals:

[0021] 1 vertical temporary restraint, 11 prestressed steel strand, 12 anchor pad (damper pad), 13 vertical pad, 14 prestressed anchor plate;

[0022] 2 longitudinal temporary restraint, 21 lower beam permanent damper lug, 22 seamless steel pipe, 23 steel beam bottom permanent damper lug;

[0023] 3 horizontal temporary restraint, 31 horizontal bracket, 32 embedded parts, 33 limit steel;

[0024] 4 tower columns; 5 lower cross beams; 6 steel beams. DETAILED DESCRIPTION

[0025] In order to better understand the purpose, structure and function of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0026] It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] like Figures 1 to 3 As shown, the utility model provides a three-way temporary restraint device for the tower beam of an I-beam composite cable-stayed bridge.

[0028] The three-way temporary restraint device is divided into three parts: vertical temporary restraint 1, longitudinal temporary restraint 2 and transverse temporary restraint 3.

[0029] The vertical temporary restraint 1 adopts the form of concrete pier + prestressed steel bundle, which mainly overcomes the vertical unbalanced force. Four anchor pads 12 are arranged on the lower crossbeam 5 of the cable tower. The anchor pads 12 are shared with the damper pads and are the same structure. The damper pads are used to install the damper ear seats. Four prestressed steel bundles 11 are arranged at each anchor pad 12, and the model and quantity of the prestressed steel bundles 11 can be selected according to calculation and analysis. Vertical pads 13 are used between the anchor pads 12 and the steel beam 6 for pad support. During the construction of the lower crossbeam 5 of the cable tower, corrugated pipes and fixed end anchors are pre-buried at the designed position, and prestressed steel strands, i.e., prestressed steel bundles 11, are installed. When the steel beam 6 is manufactured, reserved holes are set at the corresponding positions of the vertical restraint prestress, and the tower beam temporary restraint reinforcement arrangement is set, that is, prestressed anchor plates 14 and anchor stiffening plates are set, which are permanent structures of the steel beam 6.

[0030] The longitudinal temporary restraint 2 adopts the form of damper base + rigid support rod, which mainly overcomes the longitudinal unbalanced force caused by temperature load and asymmetric cantilever lifting. The longitudinal restraint device uses seamless steel pipe 22 to connect the permanent damper ear seat 23 at the bottom of the steel beam with the permanent damper ear seat 21 of the lower cross beam. The damper ear seat is a permanent structure, and the seamless steel pipe 22 is a temporary structure.

[0031] The temporary transverse restraint 3 is in the form of transverse corbel 31 + limit steel 33, which mainly overcomes the transverse unbalanced force and prevents the beam axis from being laterally deviated. The transverse corbel 31 is a permanent structure, and the limit steel 33 is a temporary structure, one end of which is welded to the embedded part 32 at the wet joint, and the other end is welded to the embedded part 32 at the tower column 4.

[0032] After the assembly of the 0# steel beam is completed, this technical solution can quickly complete the three-way temporary constraint of the tower beam, thereby carrying out cantilever assembly construction.

[0033] The utility model discloses a construction method of a three-way temporary restraint device for a cable-stayed bridge tower beam of an I-beam composite composite beam, comprising the following steps:

[0034] 1. During the construction of the lower cross beam 5 and anchor pad 12 of the cable tower, the corrugated pipe and the fixed end anchor are pre-buried at the designed position, and the prestressed steel strand is installed. When the steel beam 6 is manufactured, a reserved hole is set at the corresponding position of the vertical restraint prestress, and a temporary restraint reinforcement arrangement of the tower beam is set to make it a permanent structure of the steel beam.

[0035] 2. When the 0# steel beam main beam is installed, the temporary restraint prestress passes through the reserved hole of the steel beam according to the designed position. After the 0# steel beam is finely adjusted, the vertical pad 13 is inserted between the steel beam 6 and the anchor pad 12 to tension the vertical temporary restraint prestress and complete the vertical temporary restraint.

[0036] 3. Before installing the 0# main beam, install the permanent damper ear seat 21 at the lower beam and the permanent damper ear seat 23 at the bottom of the steel beam in place in advance. After the fine adjustment of the 0# steel beam is completed and the vertical temporary restraint is installed, connect the ear plates at both ends of the seamless steel pipe 22 to the pins of the permanent damper ear seats at the bottom of the beam and the lower beam to complete the longitudinal temporary restraint.

[0037] 4. After the fine adjustment of the 0# steel beam is completed, install the permanent transverse bracket 31. After the wet joint casting of the 0# bridge deck is completed and reaches the design strength, install the limit steel 33 to complete the transverse temporary restraint consolidation.

[0038] 5. After the three-way temporary restraint is completed, the main beam cantilever construction is carried out.

[0039] It can be understood that the present invention is described by some embodiments, and those skilled in the art know that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation mode. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, other modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details and the illustrations shown and described here.

Claims

1. A three-way temporary restraint device for tower beams of I-beam composite cable-stayed bridges, characterized in that: It includes vertical temporary restraint, longitudinal temporary restraint and transverse temporary restraint. The vertical temporary restraint includes multiple anchor pads arranged on the lower cross beam of the cable tower, vertical pads supported between the anchor pads and the steel beam, and prestressed steel bundles anchoring the lower cross beam and the steel beam as a whole. The prestressed steel bundle passes through the anchor pads. The longitudinal temporary restraint includes a seamless steel pipe connecting the bottom of the steel beam and the lower cross beam as a whole in the longitudinal direction. The transverse temporary restraint includes limiting steel, which is fixedly connected to the embedded parts on the bridge deck at the top of the steel beam and the embedded parts at the tower column respectively.

2. The three-way temporary restraint device for the tower beam of the I-beam composite cable-stayed bridge according to claim 1, characterized in that: The anchoring pads are provided in four numbers and are symmetrically distributed on the lower cross beam of the cable tower in the transverse and longitudinal directions.

3. The three-way temporary restraint device for the tower beam of the I-beam composite cable-stayed bridge according to claim 1, characterized in that: A reserved hole is arranged in the steel beam, and the prestressed steel bundle passes through the reserved hole of the steel beam and is anchored by a prestressed anchor plate; corrugated pipes are pre-embedded in the lower cross beam and the anchoring pad stone, and the prestressed steel bundle passes through the pre-embedded corrugated pipe and is anchored by a fixed end anchor arranged on the lower cross beam.

4. The three-way temporary restraint device for the tower beam of the I-beam composite cable-stayed bridge according to claim 1, characterized in that: The anchoring pad stone is provided with a lower cross beam permanent damper ear seat, the bottom surface of the steel beam is provided with a steel beam bottom permanent damper ear seat, and the two ends of the seamless steel pipe are respectively connected to the lower cross beam permanent damper ear seat and the steel beam bottom permanent damper ear seat through a pin shaft.

5. The three-way temporary restraint device for the tower beam of the I-beam composite cable-stayed bridge according to claim 1, characterized in that: The temporary transverse restraint also includes transverse corbels, which are respectively fixedly connected to the bottom surface of the steel beam and the anchoring pad stone.

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