A mobile jacking pipe backstop support device and backstop method

Abstract

The invention discloses a mobile pipe jacking anti-retreat bracket device and a method for preventing retreat, comprising a pair of anti-retreat supports respectively arranged on both sides of the pipe joint jacking direction, and used for the anti-retreat support brackets to be pushed along a direction perpendicular to the pipe joint. The guide rail of the bracket that moves in the direction; the inner side of the rear end of the anti-retraction bracket on both sides is respectively provided with a mechanical locking device for restricting the retreat of the pipe joint; Telescopic rod device; when the pipe joint advances in the direction of jacking, it first contacts and compresses the mechanical locking devices on both sides until the entire pipe joint passes, and the mechanical locking device rebounds and resists the rear end of the pipe joint to limit The pipe joint retreats; at the same time, the mobile hydraulic telescopic rod device can move to the position of the hoisting hole reserved on the side wall of the pipe joint, and insert the pin shaft into the hoisting hole to stop the pipe joint from retreating.

Description

technical field [0001] The invention relates to a mobile pipe jacking stop support device and a withdraw stop method, belonging to the field of trenchless pipe jacking engineering construction. Background technique [0002] As a kind of non-excavation technology, the basic principle of pipe jacking technology is that with the jacking force of the main jacking cylinder, the pipe jacking machine continuously cuts the soil layer in front, and discharges the soil through the excavation device, and the pipe section at the rear continues to move toward the soil layer. Push forward until the pipe jacking section is penetrated. However, in the construction process, there must be a link of hoisting and splicing of the pipe section. At this time, the jacking cylinder and the top iron are separated from the pipe section. Since the head-on resistance of the pipe jacking machine is greater than the frictional resistance around the pipe, the pipe jacking pipeline has an overall direction ...

AI Technical Summary

Problems solved by technology

The existing anti-retraction devices or methods mainly include the following types: ①A pre-embedded steel plate is installed on the pipe joint, and the pre-embedded steel plate is welded to the guide rail by welding when the pipe joint retreats, and the pipe joint is then cut off after splicing. The disadvantage is that the welding is more cumbersome And it is not reliable, and time-consuming and labor-intensive; ② Use shear pins or support rods to act on the pipe joint to prevent it from continuing to retreat. The disadvantage is that the anti-retreat effect is limited and cannot meet the strength and stability requirements; One end of the connecting pipe joint is connected to the well wall or guide rail to avoid the pipe joint from retreating. The disadvantage is that the chain hoist connection is not reliable, the installation process is cumbersome, and the special back-stop pin hole is set to easily concentrate the stress in some areas of the pipe joint.

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