Anchored pile foundation beam gravity retaining dam structure

Abstract

The application provides an anchoring type pile foundation beam gravity retaining dam structure, relates to the geological disaster prevention engineering technical field, and is suitable for debris flow prevention engineering under high and steep slope or soft foundation conditions. The structure comprises a dam body, a beam, an anti-slide pile, a continuous beam and a prestressed anchor cable system. The dam body is a cast-in-place structure and is arranged on the beam, the beam is connected with the anti-slide pile, the top of the anti-slide pile is transversely connected through the continuous beam to form an integral force structure, anchor holes are pre-set in the beam, the prestressed anchor cable system is arranged in the anchor holes and is connected with the foundation to make the dam body, the beam, the anti-slide pile and the foundation bear force cooperatively. The structure can reduce the excavation amount, improve the overall stability, the anti-slide capacity and the anti-overturning capacity of the retaining dam, and enhance the structural rigidity, and is suitable for complex geological conditions such as rock, soil and composite stratum.

Description

Technical Field

[0001] This application relates to the field of geological disaster prevention and control engineering technology, and in particular to gravity retaining dam structural systems under conditions of steep slopes or weak foundations. Background Technology

[0002] With the frequent occurrence of debris flows in mountainous areas, the importance of constructing debris flow prevention measures is becoming increasingly prominent. Traditional gravity retaining dams, relying on integral cast-in-place structures and their own weight to resist impact, are characterized by high stability and durability, and are widely used in engineering practice. However, they are prone to uneven settlement and even cracking in soft foundations; large equipment is difficult to access in steep terrain, and integral pile foundations require deep excavation of bedrock; gravity retaining dams also have weak overturning resistance. Therefore, providing an anchored pile foundation-supported beam gravity retaining dam structure is of great significance. Summary of the Invention

[0003] The purpose of this invention is to provide an anchored pile foundation support beam gravity retaining dam structure that minimizes excavation, enhances the anti-tipping safety factor, and improves the structural stiffness of a novel retaining dam structure.

[0004] The anchored pile foundation gravity retaining dam includes: dam body 1; supporting beam 2; anti-slide pile 3; continuous beam 4; prestressed anchor cable 5; anchor pier 6; anchor hole 7; steel strand 8; and anchoring section 9.

[0005] The anchored pile foundation gravity retaining dam includes a dam body and a supporting beam. The dam body is cast in place, with a supporting beam portion reserved at the bottom. The supporting beam portion includes a supporting beam 2, anti-slide piles 3, and a continuous beam 4 that connects the top of each anti-slide pile to a reinforced concrete beam to enhance the synergistic force bearing. The supporting beam 2 has pre-set anchor holes 7 that are connected to the foundation through a prestressed anchor cable system.

[0006] The anchored pile foundation gravity retaining dam has the following dimensions: dam body 1 is 16800mm long at the bottom, 18000mm high, 43000mm wide, and 2000mm long at the top. The main body is trapezoidal at both ends, with the top ends extending 5000mm and the height 9310mm. The bottom ends extend 2500mm. The water-facing side has a slope of 1:0.6, and the water-repellent side has a slope of 1:0.2. The supporting beam 2 is 7800mm long, 3000mm high, and 43000mm wide. The anti-slide piles are 1600mm in diameter and 13000mm long. The continuous beam has a rectangular cross-section of 80mm × 100mm.

[0007] The prestressed anchor cable system includes a tensioning section, a free section of the anchor cable, an anchoring section of the anchor cable, a borehole diameter of 130 mm, an expansion ring diameter of 110 mm, and a grouting pipe diameter of 22 mm.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] (1) This structure uses pile foundation beams on the basis of the original gravity retaining dam, which can reduce the amount of excavation. The continuous beam coordinates the double rows of piles to work together to ensure the overall stability of the dam body, and the optimized size of the anti-slide piles reduces the amount of material used.

[0010] (2) The prestressed anchor cables penetrating the support beam and the double-row anti-slide piles significantly improve the anti-slide and anti-overturning capabilities. The integrated installation of the anchor cable system significantly reduces the construction difficulty, and the anchor cable anchoring section greatly enhances the interlocking effect of the rock mass, fundamentally overcoming the instability risk of traditional gravity dams and adapting to complex geological conditions.

[0011] This utility model is easy to construct, has reliable structural connections, and reasonable stress distribution. The materials used in this application are commonly used and readily available, suitable for rock, soil, and composite strata conditions, and can be widely promoted and used. Attached Figure Description

[0012] The features of this utility model will become more apparent when the following figures are consulted.

[0013] Figure 1 A schematic diagram of an anchored pile foundation gravity retaining dam set up in a debris flow gully.

[0014] Figure 2 This is a schematic diagram of an anchored pile foundation gravity retaining dam.

[0015] Figure 3 The image shows a top view of an anchored pile foundation gravity retaining dam.

[0016] Figure 4 The left view shows a gravity retaining dam with anchored pile foundation and supporting beam.

[0017] In the diagram: 1. Dam body; 2. Support beam; 3. Anti-slide pile; 4. Continuous beam; 5. Prestressed anchor cable; 6. Anchor pier; 7. Anchor hole; 8. Steel strand; 9. Anchoring section.

[0018] like Figure 2 As shown, the dam body is set on the supporting beam.

[0019] like Figure 3 As shown, anchor holes 7 are located in the middle of each row of piles. Detailed Implementation

[0020] To make the technical means, features, purpose and effects of this utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] like Figures 1-4As shown, this utility model provides a design scheme: an anchored pile foundation gravity retaining dam structure includes a dam body 1; a support beam 2; anti-slide piles 3; a continuous beam 4; prestressed anchor cables 5; anchor heads 6; anchor holes 7; and a prestressed anchor cable system. The dam body 1 has a bottom length of 16800mm, a height of 18000mm, a width of 43000mm, and a top length of 2000mm. The upstream slope is 1:0.6, and the downstream slope is 1:0.2. The support beam 2 is 7800mm long, 2000mm high, and 43000mm wide. The anti-slide piles have a diameter of 1600mm and a length of 10000mm. The continuous beam has a rectangular cross-section of 100cm × 150cm. The prestressed anchor cable system includes a tensioning section, a free section, and an anchoring section. The borehole diameter is 130mm, the expansion ring diameter is 110mm, and the grouting pipe diameter is 22mm.

[0022] In this implementation case, firstly, double-row anti-slide piles 3 were drilled down to the slightly weathered rock layer, with a center-to-center distance of 3.8m and a row spacing of 10.25m. C35 concrete was poured underwater, with over-pouring at the pile top. Continuous beam 4 connects to the pile top, the laitance at the pile top is removed, and the beam reinforcement (with pre-set anchor bar slots) is tied before pouring C35 concrete. During the cast-in-place construction stage of the supporting beam, firstly, a full-span scaffolding system was erected, and the formwork elevation was precisely adjusted using a top support device; then, steel lateral formwork was installed, and PVC sleeves were simultaneously positioned and pre-embedded as anchor hole channels; during the reinforcement binding process, upper and lower double-layer main reinforcement and closed stirrups were configured. Concrete pouring was carried out in layers continuously. The anchor cable system construction first involved drilling anchor holes penetrating the supporting beam 2 and continuous beam 4, connecting to the foundation, and finally, the dam body 1 concrete was poured in layers.

[0023] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the methods and core ideas of this application. For those skilled in the art, modifications and improvements can be made to this application, and these modifications and improvements are also included within the scope of protection of the claims of this application.

Claims

1. An anchored pile-supported gravity retaining dam structure, comprising a dam body (1), a supporting beam (2), anti-slide piles (3), a continuous beam (4), and a prestressed anchor cable system, wherein the prestressed anchor cable system comprises prestressed anchor cables (5), anchor blocks (6), anchor holes (7), steel strands (8), and anchoring sections (9), characterized in that: The dam body (1) is a cast-in-place structure, and a supporting beam is reserved at the bottom of the dam body (1). The supporting beam includes a supporting beam (2), anti-slide piles (3) and a continuous beam (4). The continuous beam (4) is a reinforced concrete beam that connects the top of each anti-slide pile (3) laterally. Anchor holes (7) are preset in the supporting beam (2). The prestressed anchor cable (5) is inserted in the anchor hole (7) and is anchored to the foundation through the anchoring section (9), so that the dam body (1), supporting beam (2), anti-slide piles (3), continuous beam (4) and foundation are subjected to force together.

2. The anchored pile foundation gravity retaining dam structure according to claim 1, characterized in that: The continuous beam (4) is transversely connected to the top of each anti-slide pile (3) and together with the support beam (2) forms a pile foundation support beam load-bearing system; the anchor hole (7) is set in the support beam (2), and the prestressed anchor cable system passes through the anchor hole (7) through the support beam (2) and is anchored in the foundation.

3. The anchored pile foundation gravity retaining dam structure according to claim 1, characterized in that: The dam body (1) has a bottom length of 16800 mm, a height of 18000 mm, a width of 43000 mm, a top length of 2000 mm, and a top end extension of 5000 mm, with a height of 9310 mm. The slope ratio of the water-facing side is 1:0.6, and the slope ratio of the water-repellent side is 1:0.

2. The supporting beam (2) has a length of 7800 mm, a height of 3000 mm, and a width of 43000 mm. The anti-slide pile (3) has a diameter of 1600 mm and a length of 13000 mm. The continuous beam (4) has a rectangular cross-section of 80 mm × 100 mm.

4. The anchored pile foundation gravity retaining dam structure according to claim 1, characterized in that: The prestressed anchor cable system includes a tensioning section, a free section of the anchor cable, and an anchoring section of the anchor cable. The borehole diameter of the prestressed anchor cable system is 130 mm.

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