Embedded structure for positioning vertical prestressed tendon anchor backing plate

Abstract

The utility model relates to the technical field of building anchor bearing plates, and particularly discloses an embedding structure for positioning a vertical prestressed tendon anchor bearing plate. The structure comprises a plurality of anchor bearing plates and further comprises an embedded frame fixedly connected with a box girder top plate steel bar, a plurality of embedded parts are welded to the embedded frame, and the anchor bearing plates are clamped in the embedded parts. The technical problems that the number of anchor bearing plates used for vertical prestress of the continuous rigid frame bridge is large, the size of each anchor bearing plate is small, if an anchoring embedded structure is independently installed on each anchor bearing plate, construction is time-consuming, the positioning precision is difficult to control, and the stress characteristic of prestress is seriously affected are solved.

Description

Technical Field

[0001] This utility model relates to the field of building anchor plate technology, specifically a positioning vertical prestressed tendon anchor plate interlocking structure. Background Technology

[0002] A continuous rigid frame bridge is a type of bridge structure consisting of a T-shaped variable cross-section box girder constructed segmentally using the cantilever method for structural continuity. It is a long-span bridge structure that combines the stress characteristics of continuous beam bridges and T-shaped rigid frame bridges. The structural features of this type of bridge are a continuous main girder and a fixed pier-beam connection, maintaining the stress characteristics and smooth driving experience of continuous beam bridges while retaining the advantages of T-shaped rigid frames, such as the absence of supports and ease of construction. The commonly used spans for continuous rigid frame bridges are between 100 and 300 meters. When the span exceeds 100 meters, prestressed concrete continuous rigid frames are mostly used.

[0003] The superstructure of continuous rigid frame bridges is advantageous for cantilever construction. Cantilever construction is suitable for bridges where the upper flange of the beam bears tensile stress because the stress during cantilever construction is closer to the stress after the bridge is completed. Balanced cantilever casting is generally used. This structure belongs to the continuous beam bridge system and has advantages such as small deformation, good structural stiffness, smooth and comfortable driving, fewer expansion joints, simple maintenance, and strong seismic resistance. Due to its structural characteristics and construction advantages, it has been widely used in the construction of long-span bridges, especially in bridges over bays, deep valleys, and large rivers, becoming one of the most widely adopted structural forms.

[0004] However, during the segmental casting of box girders in continuous rigid frame bridges, the vertical prestressed anchorage structure requires the use of interlocking anchor plates for temporary positioning, so that the prestressed tensioning anchor slots are formed after the concrete is poured. In order to ensure that the position of the prestressing tendons is fixed and accurate, arc welding is usually used to weld the interlocking anchor plates to the top plate reinforcement of the box girder. This method is labor-intensive and time-consuming, and the degree of welding is difficult to control. If the weld is too strong, the interlocking is difficult to remove. If the weld is not strong, personnel will step on the reinforcement during the concrete pouring process, causing partial detachment of the weld. Ultimately, this results in a large deviation in the position of the anchor plate, which is difficult to meet the design and specification requirements and leaves hidden dangers. To solve the above problems, an anchoring structure is generally used to fix the anchor plate. For example, patent application CN202120487286.6 discloses a fixed-end anchoring structure for a vertical prestressed system. The structure includes prestressing tendons and embedded parts. The fixed end of the prestressing tendon is connected to an anchoring sleeve. The anchoring sleeve includes a body that is tubular in shape and whose inner diameter matches the outer diameter of the prestressing tendon. The outer peripheral wall of the body extends radially outward to form a limiting ear. The body and the limiting ear are integrally formed. The tubular section with the limiting ear on the body is combined with the limiting ear to form an anchoring section. The cross-section of the anchoring section is a non-circular cross-section. The embedded components include a grouting cap and an anchor plate covering the edge of the grouting cap. The anchor plate has a through hole that matches the outer peripheral contour of the anchoring section. The through hole of the anchor plate and the anchoring section form an anchoring structure with a direct passage and a staggered anti-return fit to achieve stable anchoring.

[0005] However, the box girder of a continuous rigid frame bridge requires a large number of anchor plates for vertical prestressing during the casting process, and each plate is relatively small. If each one is anchored separately, the construction will be time-consuming, and each fitting will require positioning, making it difficult to control the positioning accuracy and seriously affecting the prestressing stress characteristics. Utility Model Content

[0006] The purpose of this utility model is to provide a positioning vertical prestressed tendon anchor plate interlocking structure to solve the technical problem mentioned above in the prior art where the anchoring structure is applied to continuous rigid frame bridges. Due to the large number and small size of the anchor plates used in continuous rigid frame bridges, if each anchoring structure is installed separately, the construction will be time-consuming, and each interlocking requires positioning, making it difficult to control the positioning accuracy, which seriously affects the prestressed stress characteristics.

[0007] To solve the above problems, the technical solution adopted by this utility model is as follows: a positioning vertical prestressed tendon anchor plate fitting structure, including a plurality of anchor plates, and a fitting frame fixedly connected to the top plate reinforcement of the box girder, wherein a plurality of fittings are welded on the fitting frame, and the anchor plates are connected to the bottom of the fittings.

[0008] The beneficial effects of this implementation plan are as follows:

[0009] 1. In the existing technology, the embedding of each anchoring structure is independent. Therefore, during construction, it is necessary to pre-embed the anchor plate of each prestressing tendon, which results in a long construction period. However, in this application, an embedding frame is set up, and several embeddings are welded to the angle iron frame of the embedding frame according to the design parameters. During installation, the anchor plate is bolted to the bottom surface of the embedding and hoisted as a whole. Therefore, during construction, it is only necessary to fix the hoisted embedding frame to the top plate reinforcement of the box girder to complete the pre-embedding of all anchor plates. This method has high construction efficiency, short time, and can shorten the construction period.

[0010] 2. In the prior art, each fitting is constructed independently, and its accuracy needs to be determined individually. However, in this application, all fittings are welded to the fitting frame. As long as the accuracy of the fitting frame is guaranteed, the accuracy of all fittings on the fitting frame can be guaranteed, thereby improving the installation accuracy of the anchor plate.

[0011] 3. In the existing technology, the anchoring structure needs to be constructed on the box girder, and the workers are in a high position, which poses a high safety risk. However, in this application, the anchor plate can be installed on the ground and then hoisted onto the box girder and fixed to the top plate reinforcement of the box girder. The high-altitude operation time is short and the risk is low.

[0012] Furthermore, the fitting frame is composed of two parallel angle steels.

[0013] Furthermore, the fitting frame is provided with a fitting elevation adjustment component, and the fitting elevation adjustment component is fitted with a supporting steel bar for installation with the top plate steel bar of the box girder.

[0014] Furthermore, the lower end of the supporting steel bar is provided with a hook structure.

[0015] Furthermore, the fitting frame is also provided with a positioning component for the rear anchor threaded rod of the hanging basket, and a threaded rod nut is sleeved on the positioning component for the rear anchor threaded rod of the hanging basket.

[0016] Furthermore, the anchor plate is fixed to the fitting using bolts. Attached Figure Description

[0017] Figure 1 This is a top view of an embodiment of the present utility model.

[0018] Figure 2 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation

[0019] The following detailed description illustrates the specific implementation method:

[0020] The reference numerals in the accompanying drawings include: 1. Fitting frame; 11. Positioning component of the rear anchor threaded rod of the hanging basket; 12. Fitting elevation adjustment component; 2. Fitting; 21. Fitting welding edge; 3. Prestressed tendon; 4. Supporting steel bar; 5. Threaded rod; 6. Anchor plate.

[0021] Implementation, for example, attached Figures 1-2 As shown: A positioning vertical prestressed tendon anchor plate fitting structure includes a fitting frame 1, which includes two sets of parallel angle steels. Angle steels are welded between the parallel angle steels to form a frame. Several fittings 2 are welded between the two angle steels. The fitting welding edge 21 at the upper opening of the fitting 2 is welded firmly to the fitting frame 1.

[0022] The interlocking frame 1 has interlocking pieces welded at 50cm intervals along the longitudinal direction. Since the lengths of continuous rigid frame bridge construction segments are mostly 3.5m, 4m, and 4.5m, 3-4 interlocking pieces are welded to the interlocking frame 1 to form an interlocking assembly. This interlocking assembly is exactly 2m or 1.5m long, which can be well combined to form box girder lengths of 3.5m, 4m, and 4.5m, facilitating subsequent hoisting and installation without being too long or too short. Moreover, compared to directly forming 3.5m, 4m, and 4.5m lengths by welding the interlocking frames 1, the 2m or 1.5m length is less prone to deformation during hoisting, maintaining the flatness of the interlocking frame and laying the foundation for good anchoring.

[0023] Each fitting assembly has a mounting plate welded to the fitting frame 1. Four fitting elevation adjustment components 12 are bolted onto the mounting plate. These components are positioned inside two angle steel members. Each component 12 is a sleeve welded to both ends of the frame beam, with a bolt passing through the sleeve wall in the middle. A supporting steel bar 4, approximately 60cm long and 16mm in diameter, is inserted into the middle sleeve of each fitting elevation adjustment component 12. The lower end of the supporting steel bar 4 has a hook structure for easy welding to the beam reinforcement. The upper end is provided with a threaded rod. When the fitting is connected, a support steel bar 4 with a length of about 10cm is left at the upper end of the fitting elevation adjustment component 12. The lower end of the support steel bar 4 is welded to the top plate or web steel bar of the box girder to support the fitting frame 1. The installation height of the fitting frame 1 is adjusted by using the fitting elevation adjustment component 12. The height, verticality and flatness of the fitting frame 1 are adjusted by sliding the support steel bar 4 up and down in the sleeve of the fitting elevation adjustment component 12. After the adjustment is completed, the sleeve is used to fix the nut and tighten it.

[0024] The mounting frame 1 is also equipped with a mounting basket rear anchor threaded rod positioning component 11, which has the same structure as the mounting elevation adjustment component 12, but needs to be set in the corresponding position inside the mounting frame 1 according to the parameters of the rear anchor of the hanging basket. A threaded rod 5 is sleeved in the mounting basket rear anchor threaded rod positioning component 11. A nut is inserted at the upper and lower ends of the mounting basket rear anchor threaded rod positioning component 11 to adjust the pre-embedded height of the positioning hanging basket rear anchor threaded rod 5.

[0025] Anchor plate 6 is fixed to the bottom of fitting 2 with bolts; the vertical prestressed fitting component is hoisted to the installation position and lowered to a suitable height. The vertical prestressing tendon 3 and the corrugated pipe are manually inserted into the hole of anchor plate 6. The prestressing tendon 3 is fitted with a corrugated pipe that matches the diameter of the hole of anchor plate 6 according to the design drawing requirements. During installation, the prestressing tendon 3 and the corrugated pipe are manually inserted into the hole of anchor plate 6 and lowered to the measurement and layout position. The pre-embedded component includes anchor plate 6. A circular hole with the same diameter as the large end of the flared mouth of anchor plate 6 is opened at the center of the bottom surface of fitting 2. The prestressing tendon 3 and the sleeve are aligned and pass through the hole of anchor plate 6. Holes are opened at the corresponding positions of the bolt holes of anchor plate 6 on the bottom surface of anchor plate 6 for bolt connection. The vertical prestressing tendons 3 and corrugated pipes are manually inserted into the holes of the anchor plate 6 and lowered onto the top slab reinforcement of the box girder to correct the anchoring plane position. The supporting reinforcement 4 is then welded to the web and top slab reinforcement. The elevation of the top slab of the box girder is measured and laid out. The bolts of the fitting elevation adjustment component 12 are loosened to adjust the elevation, and then the bolts are tightened. The pre-embedded positioning of the threaded rod 5 for the hanging basket anchor is determined, and the threaded rod 5 is fixed using the threaded rod positioning component 11. This structure utilizes precise measuring instruments and tools, along with elevation adjustment components, to ensure the position and verticality of the anchor plate 6 during installation, thereby improving the overall performance and reliability of the prestressed system. Furthermore, the fitting frame 1 can be directly installed during installation, saving labor and time. Simultaneously, the fitting frame 1 is also equipped with a pre-embedded positioning and adjustment component 11 for the threaded rod 5 used for anchoring the hanging basket, ensuring the fitting accuracy of the vertical prestressed tendon anchor plate on the top slab of the box girder and the pre-embedded accuracy of the anchoring reinforcement.

[0026] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A positioning vertical prestressed tendon anchor plate fitting structure, comprising a plurality of anchor plates, characterized in that: It also includes a fitting frame that is fixedly connected to the reinforcing steel bars of the top plate of the box girder. Several fittings are welded on the fitting frame, and the anchor plate is fixedly connected to the fittings.

2. The positioning vertical prestressed tendon anchor plate fitting structure according to claim 1, characterized in that: The fitting frame is composed of two sets of parallel angle steel.

3. The positioning vertical prestressed tendon anchor plate fitting structure according to claim 1, characterized in that: The fitting frame is equipped with a fitting elevation adjustment component, and the fitting elevation adjustment component is fitted with a supporting steel bar that is connected to the top plate steel bar of the box girder.

4. The positioning vertical prestressed tendon anchor plate fitting structure according to claim 3, characterized in that: The lower end of the supporting steel bar is provided with a hook structure.

5. The positioning vertical prestressed tendon anchor plate fitting structure according to claim 1, characterized in that: The fitting frame is also provided with a positioning component for the rear anchor threaded rod of the hanging basket, and a threaded rod nut is sleeved on the positioning component for the rear anchor threaded rod of the hanging basket.

6. The positioning vertical prestressed tendon anchor plate fitting structure according to claim 1, characterized in that: The anchor plate is fixed to the fitting with bolts.

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