Hydraulic pile driving and extracting device of highway anti-collision guardrail

Abstract

The invention discloses a hydraulic pile driving and extracting device of a highway anti-collision guardrail. The device comprises an opening box body (1), an up-down floating guide part (2), a pile driving part (3) and a pile extracting part (4); the pile extracting part includes a pile extracting hydraulic oil cylinder (41), a clamping hydraulic cylinder (42), a locking chuck (43) and an inner diameter expansion mechanism (44); the inner diameter expansion mechanism includes an expansion hydraulic cylinder (441), an expansion head (442) and a clamping sleeve (443); the expansion head is mounted on an extension end of the expansion hydraulic cylinder (441), and includes a translation guide ring (4421), a clamping jaw (4422) and a connecting head (4423); and big end down conical surface structures are arranged on the inner surface of the clamping jaw and the outer surface of the connecting head. The hydraulic pile driving and extracting device can effectively extract out broken piles above or below pavements without needing excavation when realizing a pile driving function, and in particular, is suitable for the repair and maintenance work of stand columns of the highway anti-collision guardrail.

Description

technical field [0001] The invention relates to a hydraulic pile driving and pulling device, in particular to a hydraulic pile driving and pulling device suitable for highway anti-collision guardrails, and belongs to the technical field of road maintenance technology and equipment. Background technique [0002] Expressway is a high-grade highway, which refers to a highway that can adapt to the annual average day and night passenger car traffic volume of more than 25,000 vehicles, is specially designed for cars to drive at high speed in separate lanes, and all access and exit are controlled. The divider completely separates the round-trip traffic, and there are crash barriers on both sides to prevent vehicles from rushing out of the road to protect vehicles and passengers. [0003] The semi-rigid guardrail, which is easy to carry, easy to install on site, and can generate plastic deformation to absorb the impact kinetic energy of the car during the collision process, is the m...

AI Technical Summary

Problems solved by technology

[0005] During the use of highways, the anti-collision guardrails are often deformed and broken due to traffic accidents. When the guardrail columns are seriously deformed or broken directly, because they are deep below the surface, and the pipe wall is thin, the original piling The bonding strength is very high (according to the published papers, the theoretical calculation of new roadbed requires about 20.93 tons of pile pulling force), so it is very difficult to pull out and replace, and the expressway with hard soil roadbed is more difficult to pull out than the expressway with soft soil roadbed. At the same time, with the increase of the expressway's operating time and the rolling vibration generated when the vehicle passes the road, the bonding force between the anti-collision guardrail column and the roadbed is much greater than that of the new roadbed piling; in addition, especially For high-speed highways in cold regions, chemical reagents are usually used when removing snow or cleaning the road surface. After the chemical reagents penetrate into the roadbed, it is easy to cause blistering and corrosion on the surface of the anti-collision guardrail column submerged under the roadbed, increase friction, and even integrate with the corrosion of the roadbed. , which increases the difficulty of pulling out piles. Through actual verification, some broken piles need about several times the pile pulling force of the theoretical calculation value to pull out.

[0006] The traditional repairing construction method is to weld and repair the broken guardrail column, or drive a new guardrail column directly next to the broken guardrail column, and weld the standard guardrail to lengthen or cut it short by gas cutting to adapt to the new post. Non-standard column spacing, but the support strength of guardrail columns and guardrails with non-integrated structure after repair is much reduced, and cannot meet the "Code for Design of Highway Traffic Safety Facilities" (JTG D81-2006) and "Technical Specifications for Construction of Highway Traffic Safety Facilities "(JTG F71-2006) requirements on ensuring safety, smooth lines, and aesthetics; or using self-made gantry and general-purpose jacks or hoists for pile extraction operations, which is difficult in construction, high in labor intensity, long in construction period and low in efficiency

[0007] The piling-extractors in the prior art are usually capable of extracting unbroken guardrail posts through hydraulic cylinders to pull steel wire ropes, etc., but cannot extract piles for broken piles submerged below the roadbed, and usually need to be excavated before extracting. piles, and usually cannot provide enough pile pulling force, and the entire broken pile cannot be pulled out in one pile pulling operation. It usually takes several operations to pull out. It can't even be pulled out, and it can't adapt to the emergency repair work of high-grade highways

[0008] The patent No. ZL201310048520.5 that the applicant has previously applied for is the invention patent "Floating Hydraulic Piling and Pulling Device for Highway Anti-Collision Guardrail", which discloses that the piles are pulled out by opening the jaws of the clamps to support the inner wall of the broken column tube. The disadvantage is that due to the high strength of the original pile driving support, the thin-walled broken pile pipe wall is easily cracked and deformed by the jaws of the tensioner, and the pile pulling effect is not ideal.

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