Large cantilever structure suitable for broadening old road of cliff road section and construction method

Abstract

The invention relates to a large cantilever structure suitable for broadening an old road of a cliff road section. The large cantilever structure comprises an old road, a lower side slope cliff and anupper side slope cliff, and the lower side slope cliff and the upper side slope cliff are located on two sides of the old road respectively. A strip-shaped foundation, uplift piles and pile caps arearranged on the old road, the strip-shaped foundation is arranged close to the lower side slope cliff and in the length direction of the old road, the uplift piles are arranged close to the upper sideslope cliff, and the pile caps are arranged on the uplift piles; prefabricated cross beams are arranged on the old road, the prefabricated cross beams are arranged on the strip-shaped foundation andthe pile caps, and the bottoms of the prefabricated cross beams are partially embedded in the old road. Compared with the prior art, the large cantilever structure has the advantages of wide application range, safety construction, avoidance of potential safety hazards during construction, convenient and quick construction, high safety and reliability, smooth drainage, easachievement accessibilityand maintenance, and full-life design.

Description

technical field [0001] The invention belongs to the technical field of road widening, and in particular relates to a large cantilever structure and a construction method suitable for widening old roads on cliff road sections. Background technique [0002] In mountainous cliff sections, old road widening projects are often faced with a dilemma: widening to the inside of the mountain requires large-scale excavation of the mountain, high and steep slopes are seriously damaged, and the environment is damaged and the construction risk is high; widening to the outside of the mountain, due to the The terrain is too steep to allow the construction of retaining walls or piers. Therefore, for the cliff section, it is the most suitable solution to widen the old road with a large overhang structure. [0003] At present, the old road widening technology on cliff sections in mountainous areas has the following disadvantages: [0004] 1. The existing roadbed widening technology is not su...

AI Technical Summary

Problems solved by technology

For example, Chinese Patent Nos. CN109989312A and CN105236872 are aimed at slope terrain rather than cliff terrain, and the retaining wall has no foothold in the cliff section and cannot be actually constructed

[0005] 2. Existing cantilever structure technology, complex construction, high construction risk, and potential safety hazards

For example, Chinese Patent No. CN201962558U, a reinforced concrete long column pile is installed on the outside of the old road. Since the pile foundation is close to the empty surface, the hole is easy to collapse, and the pile foundation cannot be constructed.

Setting soil nails or anchors on the cliff slope requires construction workers to go down the cliff for construction, which poses a great safety hazard

[0006] 3. The existing cantilever structure technology has weak anti-overturning safety measures, and anchor rods are used as anti-overturning components

Anchor components are easy to corrode in soil, have poor durability, short life and low safety

Once the anchor fails, the overhanging structure will overturn to the side of the cliff, with serious consequences

[0007] 4. Existing cantilever structure technology makes bridge deck construction inconvenient

The cast-in-place support needs to be erected, which cannot be constructed on the cliff road section; the prefabricated slab assembly structure requires high construction accuracy, there are many prefabricated slabs, the integrity of the bridge deck is poor, there are many diseases in the later stage, and maintenance is difficult

[0008] 5. The existing cantilever structure technology does not fully consider the drainage measures, and there is a risk of water damage during the service period

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