Precast beam anchor end vent hole structure

Abstract

The utility model discloses a precast beam anchor end vent hole structure, which comprises a circular anchor backing plate and a vent pipe, the outer surface of the circular anchor backing plate is fixedly sleeved with a spiral steel bar, the rear end of the circular anchor backing plate is fixedly connected with a corrugated pipe, the front surface of the circular anchor backing plate is provided with a mud jacking hole, and the rear end of the circular anchor backing plate is fixedly connected with the corrugated pipe. An anchor plate is embedded in the position, close to a front end opening, of the inner side of the circular anchor bearing plate, anchor holes are formed in the surface of the anchor plate, and clamping pieces are embedded in the multiple anchor holes of the anchor plate. According to the vent hole structure at the anchor end of the precast beam, bubbles and slurry in the hole channel can be discharged from the end part of the steel strand at the pressure maintaining stage, and the flowing-out slurry regularly drips along the anchor sealing end and is easy to collect, so that a beam body can be prevented from being polluted, and subsequent anchor sealing is facilitated; and the single steel strand is directly reserved at the anchor end to serve as the exhaust hole, so that the construction is simple, air and water remaining in the hole channel can be fully discharged, and the problem that grouting is not compact enough is solved.

Description

Technical Field

[0001] This utility model relates to the field of building construction equipment technology, and in particular to a precast beam anchor end venting hole structure. Background Technology

[0002] In prestressed concrete construction, grouting is necessary to protect the prestressing tendons, prevent corrosion, and ensure a good bond between the tendons and the concrete. During grouting, to ensure the compactness of the grout, vent holes are installed at the highest point of the duct to expel air and excess grout. For example, grouting holes are installed at both ends and the lowest point of the precast beam, with vent holes at the highest point. During grouting, the cement grout flows out from the vent hole at the highest point until the consistency of the outflowing grout reaches the consistency of the injected grout. This ensures that the cement grout in the duct is fully saturated.

[0003] Traditional grouting methods all adopt the prestressed anchor end full sealing measures, relying solely on the return grout hole for air and water drainage. This makes it difficult to completely remove air and pressure-induced water from the anchor end channel, forming cavities, which in turn causes corrosion of the prestressed tendons and affects the durability of precast concrete beams (slabs). To address this, we propose a precast beam anchor end air vent structure. Utility Model Content

[0004] The main objective of this invention is to provide a precast beam anchor end venting hole structure, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A precast beam anchor end venting structure includes a circular anchor plate and an venting pipe. A spiral reinforcing bar is fixedly fitted onto the outer surface of the circular anchor plate. A corrugated pipe is fixedly connected to the rear end of the circular anchor plate. Grouting holes are provided on the front surface of the circular anchor plate. An anchor plate is embedded in the inner side of the circular anchor plate near the front end. Anchor holes are provided on the surface of the anchor plate. Clamping pieces are embedded in multiple anchor holes of the anchor plate, and steel strands are interlaced within the clamping pieces. The front end of the venting pipe is fixedly fitted onto the front end of the uppermost steel strand.

[0007] Preferably, the grouting hole is connected to the inner side of the circular anchor plate, and a pipe is connected to the front end of the grouting hole.

[0008] Preferably, the exhaust pipe is inserted 2 cm from the front end of the circular anchor plate.

[0009] Preferably, the front end of the uppermost steel strand is 1 cm away from the front end of the circular anchor plate.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] In this invention, the precast beam anchor end venting hole structure allows air bubbles and grout in the duct to be discharged from the end of the steel strand during the pressure holding stage. The discharged grout drips regularly along the sealing anchor end, making it easy to collect and preventing contamination of the beam body, which facilitates subsequent anchor sealing. Furthermore, directly reserving a single steel strand at the anchor end as a venting hole not only simplifies construction but also allows residual air and moisture in the duct to be fully discharged, solving the problem of insufficient grout compaction. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a precast beam anchor end vent hole structure according to the present invention;

[0013] Figure 2 This is a cross-sectional view of the pre-embedded vent hole structure at the anchor end of a precast beam according to this utility model.

[0014] Figure 3 This is a partial plan view of the precast beam anchor end vent hole structure of this utility model.

[0015] In the diagram: 1. Exhaust pipe; 2. Wedge; 3. Anchor plate; 4. Circular anchor plate; 5. Spiral reinforcement; 6. Corrugated pipe; 7. Grouting hole; 8. Solid beam; 9. Steel strand. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] like Figure 1-3 As shown, a precast beam anchor end venting hole structure includes a circular anchor plate 4 and an venting pipe 1. A spiral steel bar 5 is fixedly installed on the outer surface of the circular anchor plate 4. A corrugated pipe 6 is fixedly connected to the rear end of the circular anchor plate 4. A grouting hole 7 is provided on the front surface of the circular anchor plate 4. An anchor plate 3 is embedded and installed on the inner side of the circular anchor plate 4 near the front end. An anchor hole is opened on the surface of the anchor plate 3. A clamp 2 is embedded and installed in multiple anchor holes of the anchor plate 3. A steel strand 9 is inserted in the clamp 2. The front end of the venting pipe 1 is fixedly installed at the front end of the uppermost steel strand 9.

[0018] The grouting hole 7 is connected to the inner side of the circular anchor plate 4, and a pipe is connected to the front end of the grouting hole 7; the vent pipe 1 is inserted 2 cm away from the front end of the circular anchor plate 4; the front end of the uppermost steel strand 9 is 1 cm away from the front end of the circular anchor plate 4.

[0019] It should be noted that this utility model is a precast beam anchor end venting hole structure. During construction, sealing material is used to seal the gap between the clamp 2, anchor plate 3, circular anchor plate 4 and steel strand 9. When sealing the anchor end of the circular anchor plate 4, the topmost single steel strand 9 is reserved. The end of the steel strand 9 is 1cm away from the anchor end of the circular anchor plate 4. Then, the venting pipe 1 is fitted onto the topmost single steel strand 9 and extends into the sealing end about 2cm. This setting allows air bubbles and grout in the duct to be discharged from the end of the steel strand 9 during the pressure holding stage. The grout drips regularly along the sealing end, which is easy to collect and can avoid contaminating the beam body, facilitating subsequent sealing.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A precast beam anchorage end vent structure, characterized by: The device includes a circular anchor plate (4) and an exhaust pipe (1). The outer surface of the circular anchor plate (4) is fixedly fitted with a spiral steel bar (5). The rear end of the circular anchor plate (4) is fixedly connected with a corrugated pipe (6). The front surface of the circular anchor plate (4) is provided with grouting holes (7). An anchor plate (3) is embedded in the inner side of the circular anchor plate (4) near the front end. An anchor hole is opened on the surface of the anchor plate (3). Clips (2) are embedded in multiple anchor holes of the anchor plate (3). Steel strands (9) are inserted in the clips (2). The front end of the exhaust pipe (1) is fixedly fitted to the front end of the uppermost steel strand (9).

2. The precast beam anchorage end vent structure according to claim 1, wherein: The grouting hole (7) is connected to the inner side of the circular anchor plate (4), and a pipe is connected to the front end of the grouting hole (7).

3. The precast beam anchorage end vent structure according to claim 2, wherein: The exhaust pipe (1) is inserted 2 cm from the front port of the circular anchor plate (4).

4. The precast beam anchorage end vent structure according to claim 3, wherein: The front end of the uppermost steel strand (9) is 1 cm away from the front port of the circular anchor plate (4).

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