A prestressed anchoring structure for building foundation pit

Abstract

This application provides a prestressed anchorage structure for building foundation pits, relating to the field of foundation pit support technology. It includes soil and a cast-in-place beam located on the outer side of the soil. Pre-embedded holes are formed in the soil and the cast-in-place beam, and sleeves are inserted into these holes. Multiple sets of protruding reinforcing bodies are provided at the bottom of the sleeves, equidistantly distributed among them. Multiple through holes are formed on the sleeves between the reinforcing bodies. Prestressed tendons composed of multiple sets of steel strands are installed inside the sleeves, and conical anchor bodies are provided at the ends of the prestressed tendons. The anchorage structure proposed in this invention, by providing multiple through holes at the bottom of the sleeves, allows slurry to overflow from the through holes and contact the soil during slurry pouring. This allows the slurry, reinforcing bodies, and soil to mix and form a high-density concrete structure, enhancing the friction between the conical anchor bodies and the soil, thereby generating tensile force and achieving stable support for the cast-in-place beam.

Description

Technical Field

[0001] This utility model relates to the field of building foundation pit support technology, specifically a prestressed anchoring structure for building foundation pits. Background Technology

[0002] A soil anchor is a tension member embedded in the soil. One end of the anchor is connected to the diaphragm wall of the foundation pit, while the other end is anchored in the soil. It is typically prestressed to withstand the tensile forces generated by earth pressure and water pressure, thus maintaining the stability of the diaphragm wall. Usually, the end of the anchor in the soil is connected to a cylindrical concrete anchor body. However, for softer soil layers such as clay, ordinary anchors are insufficient.

[0003] To address the aforementioned issues, we propose a prestressed anchorage structure for building foundation pits. Utility Model Content

[0004] To address the problems in the background art, this utility model provides a prestressed anchorage structure for building foundation pits.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A prestressed anchoring structure for a building foundation pit includes soil and a cast-in-place beam located on the outer side of the soil. Pre-embedded holes are formed in the soil and the cast-in-place beam. Sleeves are inserted into the pre-embedded holes. Multiple sets of protruding reinforcing bodies are provided at the bottom of the sleeves, and these reinforcing bodies are equidistantly distributed. Multiple through holes are formed on the sleeves between the reinforcing bodies. Prestressing tendons composed of multiple sets of steel strands are installed inside the sleeves. Conical anchor bodies are provided at the ends of the prestressing tendons. A waist seat is provided at the outer end of the cast-in-place beam, and the prestressing tendons pass through the waist seat and connect to a support plate.

[0006] Preferably, the sleeve is located outside the conical anchor body, and the bottom end face of the sleeve abuts against the conical anchor body.

[0007] Preferably, the conical anchor body is located at the bottom of the pre-embedded hole.

[0008] Preferably, the prestressed tendons form a 70° angle with the cast-in-place beam.

[0009] Compared with the prior art, the beneficial effects of this utility model are: The anchoring structure proposed in this utility model has multiple sets of through holes at the bottom of the sleeve. During the slurry pouring, the slurry can overflow from the through holes and come into contact with the soil, allowing the slurry, the reinforced body, and the soil to mix and form a concrete structure. This allows the sleeve to provide stable support for the conical anchor body, enhances the friction between the conical anchor body and the soil, and thus generates tensile force, thereby achieving stable support for the cast-in-place beam. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the bottom structure of the sleeve in this utility model.

[0011] In the diagram: 1. Soil; 2. Cast-in-place beam; 3. Waist seat; 4. Support plate; 5. Prestressed tendon; 6. Conical anchor body; 7. Embedded hole; 8. Sleeve; 9. Reinforced body; 10. Through hole. Detailed Implementation

[0012] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows: Example: Refer to Figure 1 - Figure 2 As shown, a prestressed anchorage structure for a building foundation pit in this embodiment includes a soil body 1 and a cast-in-place beam 2 located on the outer side of the soil body 1. Pre-embedded holes 7 are provided in the soil body 1 and the cast-in-place beam 2. Sleeves 8 are inserted into the pre-embedded holes 7. Multiple sets of protruding reinforcing bodies 9 are provided at the bottom of the sleeves 8, and these bodies are equidistantly distributed. Multiple sets of through holes 10 are provided on the sleeves 8 between the reinforcing bodies 9. Prestressed tendons 5, composed of multiple sets of steel strands, are installed inside the sleeves 8. Conical anchor bodies 6 are provided at the ends of the prestressed tendons 5. A waist seat 3 is provided at the outer end of the cast-in-place beam 2, and the prestressed tendons 5 pass through the waist seat 3 and are connected to a support plate 4.

[0013] After the pre-embedded hole 7 is drilled, the conical anchor body 6 needs to be inserted into the bottom of the pre-embedded hole 7. At the same time, the sleeve 8 needs to be inserted into the pre-embedded hole 7 to achieve abutment and restraint of the conical anchor body 6. In addition, by setting multiple sets of through holes 10 at the bottom of the sleeve 8, the slurry can come into contact with the outer soil 1 through the through holes 10 during slurry pouring, forming a concrete structure. During pouring, the multiple sets of reinforcing bodies 9 will mix with the concrete to form an integral structure, thereby enhancing the fixation of the sleeve 8 and providing stable abutment and support for the conical anchor body 6. At this time, the anchoring constraint formed by the prestressed tendon 5 and the conical anchor body 6 can effectively control the deformation of the foundation pit and play a role in stabilizing the support.

[0014] In some examples, the sleeve 8 is located outside the conical anchor body 6, and the bottom end face of the sleeve 8 abuts against the conical anchor body 6, so that the sleeve 8 provides limiting support for the conical anchor body 6.

[0015] In some examples, the tapered anchor body 6 is located at the bottom of the pre-embedded hole 7.

[0016] In some examples, the prestressing tendon 5 forms a 70° angle with the cast-in-place beam 2. The prestressing of the angled support is more stable than that of the vertical or horizontal prestressing.

[0017] The anchoring structure proposed in this utility model, by opening multiple sets of through holes 10 at the bottom of the sleeve 8, allows the mud, the reinforced body 9 and the soil 1 to be mixed and poured to form a high-density concrete structure, thereby limiting and fixing the sleeve 8, and thus achieving stable contact with the conical anchor body 6, thereby increasing the friction between the conical anchor body 6 and the soil 1, thereby generating tensile force, and thus achieving stable support for the cast-in-place beam 2.

[0018] 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 prestressed anchorage structure for building foundation pits, characterized in that, Includes soil (1) and a grouting beam (2) located on the outer side of the soil (1). The soil (1) and the grouting beam (2) are provided with pre-embedded holes (7). A sleeve (8) is inserted and installed in the pre-embedded holes (7). The bottom of the sleeve (8) is provided with multiple sets of protruding reinforcement bodies (9). The multiple sets of reinforcement bodies (9) are equidistantly distributed, and multiple sets of through holes (10) are opened on the sleeve (8) between the multiple sets of reinforcement bodies (9). The sleeve (8) is equipped with a prestressed tendon (5) composed of multiple sets of steel strands. The end of the prestressed tendon (5) is provided with a tapered anchor body (6). The outer end of the grouting beam (2) is provided with a waist seat (3). The prestressed tendon (5) passes through the waist seat (3) and is connected to the support plate (4).

2. The prestressed anchorage structure for building foundation pits according to claim 1, characterized in that, The sleeve (8) is located outside the conical anchor body (6), and the bottom end face of the sleeve (8) abuts against the conical anchor body (6).

3. The prestressed anchorage structure for building foundation pits according to claim 2, characterized in that, The conical anchor body (6) is located at the bottom of the pre-embedded hole (7).

4. The prestressed anchorage structure for building foundation pits according to claim 1, characterized in that, The prestressed tendon (5) forms a 70° angle with the cast-in-place beam (2).

Images