A box girder erection accuracy adjustment device

Abstract

This utility model discloses a box girder erection accuracy adjustment device, including concrete supports, a box girder support laid on the concrete supports, and a box girder component installed on the box girder support. Multiple installation lifting rings are provided on both sides of the box girder component, and a stress-bearing plate is provided on the side of each end of the box girder component. The stress-bearing plate is L-shaped and includes an installation side plate and a lifting plate. Corbel structures are respectively provided on the side of each end of the box girder component, and each corbel structure is fixed between the installation side plate and the lifting plate. A reinforcing connection structure is provided between the lifting plate and the corbel structure. This utility model provides a device that can adjust the orientation and limit and fix temporary supports, thus achieving a good adjustment effect.

Description

Technical Field

[0001] This utility model belongs to the field of engineering construction technology, and specifically relates to a box girder erection accuracy adjustment device. Background Technology

[0002] Prestressed concrete box girders, by applying prestress, effectively utilize the high compressive strength of concrete to overcome its weak tensile strength. They are widely used in highway and railway bridges and building structures of various spans. The closed box section provides a huge moment of inertia, giving it extremely strong resistance to bending deformation under vertical loads, making it particularly suitable for long-span structures. The material (concrete or steel) is mainly distributed in the top and bottom slabs, away from the neutral axis, which more effectively resists bending moments.

[0003] In existing technologies, the main installation methods are hoisting, segmental assembly, or incremental launching. Hoisting involves prefabricating concrete or steel box girders in sections at a factory or prefabrication yard, transporting them to the site, and hoisting them into place. Segmental assembly divides the box girder into several small segments (concrete or steel), prefabricates them in a factory, transports them to the site, and assembles them segment by segment using bridge erecting machines, applying prestress (concrete) or welding / bolting connections (steel). Incremental launching involves pouring or assembling box girder segments segment by segment behind the abutment, using jacks to push the completed girder forward until it reaches the designed position. This method is particularly suitable for crossing obstacles such as deep valleys, rivers, and transportation lines.

[0004] However, overall, the accuracy of box girder erection is a core control indicator in bridge construction, directly affecting structural safety, load-bearing performance, alignment smoothness (driving comfort), service life, and the smooth progress of subsequent procedures. For example, the horizontal deviation of the box girder centerline from the design axis (axis misalignment) affects the overall alignment of the bridge, the uniformity of stress (especially the support reaction force), and the matching of adjacent beam segments. Utility Model Content

[0005] The purpose of this utility model is to provide a box girder erection accuracy adjustment device. By providing an auxiliary device that can perform jacking operations on concrete supports, the device can effectively avoid repeated lifting and accurately adjust the position of the box girder when it is not in place.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A box girder erection accuracy adjustment device includes a concrete support, a box girder support laid on the concrete support, and a box girder component installed on the box girder support. Multiple installation lifting rings are provided on both sides of the box girder component, and a stress plate is provided on the side of each end of the box girder component. The stress plate is L-shaped and includes an installation side plate and a lifting plate. Corbel structures are respectively provided on the side of each end of the box girder component, and each corbel structure is fixed between the installation side plate and the lifting plate. A reinforcing connection structure is provided between the lifting plate and the corbel structure.

[0008] Furthermore, the corbel structure includes a hydraulic jack, and the hydraulic jack support contacts the box girder support after hoisting.

[0009] Furthermore, infrared rangefinders are respectively installed on the lifting plate to measure the height distance between the lifting plate and the box girder support.

[0010] Furthermore, the reinforced connection structure includes multiple diagonally supporting steel columns.

[0011] Furthermore, the two ends of the inclined support steel column are respectively welded to the corbel structure and the lifting plate.

[0012] Furthermore, the mounting side plate and the lifting plate of the load-bearing plate are both fixedly connected to the box girder component by bolts.

[0013] Compared with the prior art, the advantages of this utility model are as follows: This utility model adopts corbel structures set on the sides of both ends of the box girder. After the box girder is hoisted onto the box girder support, hydraulic jacks are used for small-range adjustments, which can effectively compensate for the problem of poor hoisting accuracy, thereby adjusting the accuracy problem during the erection of the box girder. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the box girder erection accuracy adjustment device provided by this utility model.

[0016] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0017] Figure label:

[0018] 1. Concrete support pier; 2. Box girder support; 3. Box girder components; 4. Corbel structure; 5. Hydraulic jacks; 6. Side plate installation; 7. Lifting plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying 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, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first," "second," and "third" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0023] Furthermore, the use of terms such as "horizontal," "vertical," and "suspended" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0026] like Figures 1-2 As shown, a box girder erection accuracy adjustment device includes a concrete support 1, a box girder support 2 laid on the concrete support 1, and a box girder component 3 installed on the box girder support 2. Multiple installation lifting rings are provided on both sides of the box girder component 3, and a load-bearing plate is provided on the side of both ends of the box girder component 3. The load-bearing plate is L-shaped and includes an installation side plate 6 and a lifting plate 7. Corbel structures 4 are respectively provided on the side of both ends of the box girder component 3, and each corbel structure 4 is fixed between the installation side plate 6 and the lifting plate 7. A reinforcing connection structure is provided between the lifting plate 7 and the corbel structure 4.

[0027] Compared with existing technologies, which require large transportation and hoisting equipment for whole precast box girders and can only be installed using gantry cranes, this invention is not suitable for the structure of this utility model. This utility model is more suitable for the hoisting and installation of segmented precast box girder components 3 in cast-in-place box girders. The corbel structure 4 allows for lateral displacement adjustment after initial hoisting, ensuring the box girder component 3 accurately reaches the preset position, thereby effectively adjusting the installation accuracy.

[0028] The corbel structure 4 includes a hydraulic jack 5, and the support column of the hydraulic jack 5 contacts the box girder support 2 after hoisting. The reinforcing connection structure includes multiple diagonal support steel columns. The two ends of the diagonal support steel columns are welded to the corbel structure 4 and the jacking plate 7, respectively.

[0029] Infrared rangefinders are installed on the lifting plate 7 to measure the height distance between the lifting plate 7 and the box girder support 2. By reading the height of the lifting plate 7 and the box girder support 2 from each direction using the infrared rangefinders, the possibility of the box girder component 3 overturning is avoided due to excessive height on one side.

[0030] The mounting side plate 6 and the lifting plate 7 of the load-bearing plate are both fixedly connected to the box girder component 3 by bolts.

[0031] Specifically, during use, site leveling and surveying are required first. Drilling rigs are then positioned and holes are drilled. Two concrete supports (1) are constructed by hoisting the reinforcing cage and pouring concrete. A cap beam is then poured between the two supports (1) to form the box girder support (2). When installing the box girder (3), a crane-assisted hoisting method is used. This hoisting process typically requires two cranes with similar performance, and each crane's load should not exceed 80% of its allowable load. A trial hoist should be conducted during the first hoisting to avoid operational risks. Then, the formal hoisting operation is carried out. During the hoisting operation, the same box girder 3 should correspond to its preset span. After the initial hoisting into place, the precise position adjustment is carried out. The difference between the installation position of the box girder 3 and the preset position is observed manually. If there is a deviation, the hoisting will not be repeated. The position adjustment is carried out by using the corbel structure 4 on both sides of the box girder 3. The hydraulic jacks 5 are used to lift the box girder 3 alternately to adjust the lateral position. During the adjustment, the lifting height is monitored by an infrared rangefinder to avoid the risk of the box girder 3 overturning due to one side being too high.

[0032] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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. Such 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 this application.

Claims

1. A device for adjusting the erection accuracy of a box girder, characterized by The system includes a concrete support (1), a box girder support (2) laid on the concrete support (1), and a box girder component (3) installed on the box girder support (2). Multiple installation lifting rings are provided on both sides of the box girder component (3), and a load-bearing plate is provided on both sides of the box girder component (3). The load-bearing plate is L-shaped and includes an installation side plate (6) and a lifting plate (7). Corbel structures (4) are provided on both sides of the box girder component (3), and each corbel structure (4) is fixed between the installation side plate (6) and the lifting plate (7). A reinforcing connection structure is provided between the lifting plate (7) and the corbel structure (4).

2. The box girder erection precision adjustment device according to claim 1, characterized by The corbel structure (4) includes a hydraulic jack (5), and the hydraulic jack (5) supports contact the box girder support (2) after hoisting.

3. The box girder erection precision adjustment device according to claim 1, characterized by Infrared rangefinders are installed on the lifting plate (7) to measure the height distance between the lifting plate (7) and the box girder support (2).

4. The box girder erection precision adjustment device according to claim 1, characterized by The reinforced connection structure includes multiple diagonally supporting steel columns.

5. The box girder erection precision adjustment device according to claim 4, characterized by The two ends of the inclined support steel column are respectively welded to the corbel structure (4) and the lifting plate (7).

6. The box girder erection precision adjustment device according to claim 1, characterized by The mounting side plate (6) and the lifting plate (7) of the load-bearing plate are both fixedly connected to the box girder component (3) by bolts.

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