The invention provides a movable smooth jacking mechanism for pipe jacking construction. The movable smooth jacking mechanism for pipe jacking construction comprises a pipe jacking push block, a connecting bolt and an adjusting connecting block; a bearing base is of an L-shaped structure, and a track chute is arranged on the top end face of the bearing base through a bolt; the track chute is of anelongated groove-shaped structure, the front side and the rear side of the track chute are respectively provided with a sliding hole, and the sliding holes communicate with the inside of the track chute; and a cylinder body support frame is of a frame structure, two oil cylinders are arranged in the cylinder body support frame in a vertical arrangement mode, and the cylinder body support frame ispositioned at the top of the bearing base. According to the movable smooth jacking mechanism for pipe jacking construction, the left part and the right part of the pipe jacking push block can be separated and moved according to the diameter of a required construction pipeline, so that the left part and the right part of the pipe jacking push block can be attached to the left end and the right endof a pipeline opening, the butt joint effect of the pipe jacking push block and the pipeline is guaranteed, and the movable smooth jacking mechanism for pipe jacking construction is better suitable for the construction operation of pipelines with different diameters.

Movable smooth jacking mechanism for pipe jacking construction

The invention relates to a retreat-preventing device for a tube sheet of a tube push bench and an application method thereof. The retreat-preventing device comprises counter-force racks, connecting plates and jacks, wherein the counter-force racks are fixed to a launch shaft base and are arranged on two sides of a hole excavated by the tube push bench, and the counter-force racks are provided withmounting faces opposite to a section excavated by the tube push bench; the connecting plates are detachably mounted on two sides of the tube sheet at the hole, and the connecting plates are located between the mounting faces and the section excavated by the tube push bench; and the jacks, corresponding to the connecting plates, are vertically mounted on the mounting faces, the jacks are electrically connected to controller sensors, and displacement changes of jack nodes of the jacks are induced by the sensors, so that controllers adjust thrusts acted to the connecting plates till the jackingnodes of the jacks no longer displace, so that the tube sheet is prevented from retreating. The retreat-preventing device solves the problem that the push tube is hard to prevent retreat in a deeply buried large push tube project effectively, can adjust the thrust of the retreat-preventing device precisely to keep balance of the thrust and the pressure of a soil surface so as to prevent aggravation of surface subsidence, so that the construction quality and the construction efficiency are improved.

Retreat-preventing device for tube sheet of tube push bench and application method thereof

The invention discloses a construction method for quickly clearing the sediment at the shield tail of a double-shield TBM, which comprises the steps A, measuring the sediment at the shield tail and the depth of the water surface, and preparing to install a sediment clearing device, wherein the clearing device includes a hard guide pipe and a ventilation pipe, one end of the ventilation pipe is communicated to the wall of the hard guide pipe, and the ventilation pipe is arranged in an inclined manner relative to the hard guide pipe; B, connecting the other end of the ventilation pipe to an aircompressor; C, putting the clearing device in the sediment and water to be cleared at the shield tail, wherein the junction of the hard guide pipe and the ventilation pipe is completely submerged under the water surface, and the inclination direction of the ventilation pipe faces towards the shield bottom; D, connecting the other end, which is opposite to the inclination direction of the ventilation pipe, of the hard guide pipe to a transfer container; E, starting the air compressor for ventilation, wherein the air enters the hard guide pipe through the ventilation pipe, the sediment and waterabove the junction of the hard guide pipe and the ventilation pipe are discharged along with the air, a small section of partial vacuum is formed in the hard guide pipe, and the sediment and water inthe shield tail are pushed into the hard guide pipe under the impact of the external atmospheric pressure and the air and are gradually discharged to the transfer container through the hard guide pipe.

Construction method for quickly clearing sediment at shield tail of double-shield TBM

The invention relates to a gantry type pipe joint fixator which comprises a base, supporting legs and a gantry mechanism. The two ends of the gantry mechanism are fixedly connected to the base throughthe supporting legs, a radial positioning power mechanism is arranged in the middle of the lower portion of the gantry mechanism, the radial positioning power mechanism is composed of an arc-shaped compression plate, a hydraulic jack and shafts, the upper end of the arc-shaped compression plate is connected to the gantry mechanism through the hydraulic jack, the two sides of the arc-shaped compression plate are connected to the two inner side faces of the gantry mechanism through the shafts, one ends of the shafts are hinged to lug seats on the two inner side surfaces of the gantry mechanismthrough pin shafts, the other ends of the shafts are connected to a connecting frame on the arc-shaped compression plate, extending/contracting motions of the hydraulic jack drive the arc-shaped compression plate to restrain the radial freedom degree of a pipe joint, and the effect of fixing the pipe joint is achieved. By means of the gantry type pipe joint fixator, the problems existing in a pipejacking project are effectively solved, and the work efficiency of pipe joint docking can be greatly improved.

Gantry type pipe joint fixator

The invention relates to a pipe-jacking starting-frame supporting system and method for constructing tunnel connecting channels. The supporting system comprises a stretchable-adjustment bottom jackingsupporting structure fixedly arranged at the bottom of a starting frame, a stretchable-adjustment top jacking supporting structure fixedly arranged at the top of the starting frame and a stretchable-adjustment lateral jacking supporting structure fixedly arranged on the side, away from a to-be-constructed connecting channel, on the starting frame; the bottom jacking supporting structure, the topjacking supporting structure and the lateral jacking supporting structure are jacked and supported into a main tunnel through stretchable adjustment of the bottom jacking supporting structure, the topjacking supporting structure and the lateral jacking supporting structure, and therefore the starting frame is supported into the main tunnel. The starting frame is assembled through the supporting system, assembling and disassembling are fast and convenient, the pipe-jacking starting-frame supporting system and method can better meet the requirements of functionality and structural stability ofnarrow-space tunnel connecting channels, the construction safety risk is reduced, and the construction efficiency is improved.

Pipe-jacking starting-frame supporting system and method for constructing tunnel connecting channels

The invention relates to a main jacking device for pipe jacking construction through a pipe-roofing underground excavation method The main jacking device comprises a base, a fixed back part connectedwith the base, a propelling assembly movably and slidably arranged on the base, power mechanisms fixedly arranged on the propelling assembly, a portal frame fixedly arranged on the base and located in front of the propelling assembly, and stopping mechanisms mounted on the portal frame and capable of conducting extending-retracting adjustment The power mechanisms are connected with the fixed back part, and the propelling assembly is pushed through the power mechanisms to move forwards along the base; and sawtoothed faces matched with pipe sections are arranged on the stopping mechanisms, andthe sawtoothed faces are closely attached to the outer side faces of the pipe sections through extending-retracting adjustment of the stopping mechanisms The phenomenon that the jacked pipe sectionsrecede when the pipe sections are additionally arranged during pipe jacking construction through the pipe-roofing underground excavation method can be well avoided, downward-inclining of the whole pipe sections due to sinking of a machine head in the propelling process can slow down, and stable propelling of the pipe sections can be ensured, and the construction efficiency is high

Main jacking device for pipe jacking construction through pipe-roofing underground excavation method

The invention relates to a soil outlet device of a pipe-roofing pipe jacking machine. The soil outlet device comprises a soil conveying pipeline connected to a screw machine of the pipe jacking machine, a stirring box, a water injecting system and a mud discharging system. The stirring box is connected with the soil conveying pipeline and used for containing mud conveyed by the soil conveying pipeline, a rotatable stirring shaft is mounted in the stirring box, and the mud in the stirring box is stirred through rotation of the stirring shaft. The water injection system is connected with the stirring box and injects water into the stirring box. The mud discharging system communicates with the stirring box and discharges mud water formed by mixing of the mud and the water in the stirring box.The soil outlet device is high in efficiency and suitable for the small-hole-diameter pipe-roofing soil pressure pipe jacking machine, has the advantages of simple structure, high crushing and scouring ability and rapid soil outlet, and meets continuous soil outlet of the soil pressure pipe jacking machine in the real-time propulsion process. The problems that during long-distance mud dischargingof the small-hole-diameter soil pressure pipe jacking, the soil outlet efficiency is low through manual conveying, and the safety risk exists are solved.

Soil outlet device of pipe-roofing pipe jacking machine

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Main jacking device for pipe jacking construction through pipe-roofing underground excavation method

Soil outlet device of pipe-roofing pipe jacking machine