45results about How to "Smooth tunneling" patented technology

The invention provides a large-diameter slurry shield comprehensive tunneling method for a strong permeable soil and rock composite stratum, and relates to the field of shield construction. Accordingto the method, a combined type atmospheric pressure cutterhead is adopted, cutter locations are arranged on the cutterhead, and tools which can be changed at the atmospheric pressure are installed onthe cutter locations; the cutter locations include a Class I cutter location fixed in the form of the tool and a Class II cutter location which can realize hobbing interchange at the atmospheric pressure; fixed tools are installed on the Class I cutter location, interchangeable tools are installed on the Class II cutter location, and cutting trajectories of the interchangeable tools covers the cutterhead; tunneling process control includes control over the cutterhead rotating speed, control over the cutterhead thrust and torque, control over the cutting opening pressure, control over attitude,and control over synchronous grouting construction parameters; and rigid single-fluid slurry with water dispersion resistance is adopted during synchronous grouting construction. By adopting the combined type atmospheric pressure cutterhead, the two types of tools are sepatrately mounted on the cutterhead, the two types of cutter locations cover the cutting trajectory of the entire cutterhead, the fixed tools are used for cutting soil mass, the interchangeable tools are used for cutting rock mass, and therefore smooth tunneling of composite geology is ensured.

The invention relates to a method for protecting an underground structure of single round shield side face construction in close distance, belonging to the technical field of constructional engineering. The method comprises the following steps: using a Robertson method; determining the parameters of a shield traversing underground structure through the design drawings of the underground structure and tunnels; using three-dimensional finite element model to perform numerical simulation; establishing monitoring programs, carrying out measuring points layout and monitoring in site before traversing construction; detecting the work efficiency of trial push and selecting construction parameters; carrying out construction through monitoring feedback analysis in real time; and tracking and monitoring the set monitoring points until all monitoring data are stabilized within the range of the optimized safety construction parameters of step (6). The invention ensures the normal use and the smooth tunneling of the underground structure, the adopted technical measures is applicable to the requirements of single round shield side face in close distance on passing through various underground structures, thus an important technical assurance is provided.

The invention provides a soft rock tunnel construction method. The soft rock tunnel construction method comprises the following steps of: densely arranging grid arch frames in a tunnel, mounting and fixing the grid arch frames, hanging nets, mounting steel arch frames and net sheets, and then checking and accepting the steel arch frames and the net sheets; then, coating top arches and side walls, operating a steel mould trolley and pouring concrete into the side walls; pouring the concrete into top arches; and maintaining. By adopting the soft rock tunnel construction method, the construction efficiency of the soft rock tunnel is improved, the construction safety is ensured and the construction cost is lowered.

The invention discloses a fishtail center cutter for a shield machine and belongs to the field of the shield machine of tunnel construction. The center cutter is characterized in that a cutter (2), a cutter (3), a cutter (4) and a cutter (5) are welded to a cutter body (1), the cutter (2), the cutter (3) and the cutter (4) are located on two sides of the cutter body, the cutter (5) is distributed on the upper portion of the cutter body (1), the cutter (2), the cutter (3) and the cutter (4) are reinforcing advanced cutters and the cutter (5) is a reinforcing cutting knife. When the shield machine runs in the soft land layer, the cutting knife cannot be arranged at the central position of a knife disk, the cutters are used for improving the chipping and stirring effect of the soil of the central position of the excavated surface, the problem that the cutter knife cannot be arranged at the central position of the knife disk of the soft land layer is solved, the chipping problem of the central position soil can be solved, the fluidity of chipped soil can be improved, and the whole tunneling effect of the shield machine can be improved greatly. The center cutter can save the construction cost, save the construction time and improve the construction efficiency and can be widely used in the shield machine industry.

The invention discloses a water jet combined hob rock breaking mechanism, including a cutter disc which is arranged at the front end of a machine body and can feed in the axial direction and rotate inthe circumferential direction, a plurality of layers of hobs arranged on the surface of the cutter disc and distributed in a ring shape, and a jet nozzle arranged on the surface of the cutter disc and between the hobs of the adjacent two layers, and used for cutting a rock face to form several layers of annular cutting slots during the rotation of the cutter disc, and the current depth of the annular cutting seam of each layer is greater than the current cutting depth of the hobs of each layer. According to the water jet combined hob rock breaking mechanism, by use of the annular cutting slots formed by the jet nozzle on the rock surface, the hobs of each layer only needs to overcome the weak shear strength of rocks, rock surface fracture is realized by a shearing failure mode of each layer rock surface ring, the difficulty of tunneling for rocks with high compressive strength is lowered, at the same time, tunneling efficiency is improved and tool wear is reduced. The invention further discloses a shield tunneling machine which has the beneficial effects.

The invention discloses an impact rock breaking cutterhead structure. The impact rock breaking cutterhead structure comprises a cutterhead body which is arranged at the front end of a machine body andcan feed along the axial direction and rotate along the circumferential direction, impact assemblies arranged on cutterhead body in an axially telescopic mode, distributed in a multi-layer annular mode and used for digging a plurality of layers of annular grooves in a tunnel face along with rotation of the cutterhead body, and rock breaking assemblies arranged on the cutterhead body in an axiallytelescopic mode, distributed in a multi-layer annular mode and used for impacting and breaking annular rock layers located between every two adjacent layers of the annular grooves on the tunnel facealong with rotation of the cutterhead body. Therefore, in the tunneling process, the layers of the annular grooves are formed in a rock surface through the impact assemblies, so that rock breaking assemblies of the layers only need to overcome the weak shear strength of rock, rock surface breaking is achieved through the shear failure mode of the annular rock layers, the tunneling difficulty of rock with large compressive strength is reduced, meanwhile, the tunneling efficiency is improved, and cutter abrasion is reduced. The invention also discloses a tunnel boring machine which has the abovebeneficial effects.

The invention discloses a muddy water/soil pressure dual-mode shield and a driving mode conversion method thereof. The muddy water/soil pressure dual-mode shield is provided with devices and supporting equipment required for driving in a muddy water mode and a soil pressure mode, and can adopt muddy water and soil pressure dual modes for driving. During converting of the muddy water mode into thesoil pressure mode, after a bypass mud pipeline and a communicating pipe are closed, the pressure changes of a soil bin and an air cushion bin are observed, and then whether conversion can be carriedout or not is judged, so that the stable pressure of the soil bin in the conversion process is ensured advantageously; and in the reverse flow mud discharging process, the mud discharging speed can becontrolled through a mud discharging pump and is matched with the driving speed of the shield, and thus the stable pressure in the soil bin can be actively maintained. During converting of the soil pressure mode into the muddy water mode, a part of muck is discharged through a screw conveyor firstly, and the screw conveyor discharges the muck quickly, so that the conversion efficiency is improvedadvantageously; and reserved muck is subjected to muck-mud replacement through a back-washing mode so that the situation that gushing appears when the screw conveyor discharges the remaining small amount of muck, and consequently, the pressure of the soil bin loses stability can be prevented.

The invention relates to a method for improving full-section muck in a silt soil layer during construction of a contact channel pipe jacking machine. The method comprises the following steps of: S1, determining a muck improver; S2, performing an indoor test; S3, mixing the muck improver on site; and S4, performing site construction. The method has the beneficial effects that the muck is improved by adopting a bentonite improver (a bentonite solution and a high-molecular flocculant), a high-molecular polymer solution has relatively high adhesion and can well absorb soil moisture, and the permeability coefficient of the muck is changed through cutter head cutting and screw machine stirring, so that the muck is fully improved. The improved muck is not easy to gush and cake, the permeability of the muck in a soil bin is effectively reduced, and the gushing is further inhibited, so that shield tunneling is smooth and efficient, the shutdown time is shortened, the muck in a screw machine is prevented from being solidified, and the construction safety and smoothness are guaranteed.

Provided is a construction method of a below-sensitive-building water-enriched rock stratum full-section grouting shield. The construction method of the below-sensitive-building water-enriched rock stratum full-section grouting shield includes the construction steps of reinforcing shield sealing, filling the periphery of the shield with bentonite, supplementing grout to gaps behind duct-piece walls, replacing muck with gas, replacing the gas with grout, grouting full sections, detecting grouting effects and conducting shield tunneling. By the adoption of the construction method of the below-sensitive-building water-enriched rock stratum full-section grouting shield, base-rock gap channels can be effectively sealed in all directions, loss of underground water is reduced, tunneling environment is improved, soil transporting of a screw conveyor is facilitated, so that the shield tunnels rapidly, and descending of buildings on the earth surface can be effectively controlled.

The invention belongs to the technical field of coal mine excavation, and particularly relates to a coal mine roadway rapid tunneling auxiliary device. Aiming at solving the technical problems that atunneling machine is small in excavation crushing area and slow in progress during coal mine excavation, the following scheme is put forward currently, the coal mine roadway rapid tunneling auxiliarydevice comprises a base plate, a base is fixed to the outer wall of the top of the base plate, a third telescopic rod is fixed to the inner wall of the rear side of the base, and a toothed plate is fixed to the top end of the third telescopic rod. According to the coal mine roadway rapid tunneling auxiliary device, through arrangement of the third telescopic rod, the toothed plate, a rotating rodand a toothed disc, the third telescopic rod extends and retracts, the toothed plate moves forwards and backwards, thus the toothed disc and the rotating rod are made to rotate leftwards and rightwards, and therefore the transverse direction of drill bit excavation is controlled; and through arrangement of a second connecting rod, a first connecting rod, a second telescopic rod and a first telescopic rod, the second telescopic rod and the first telescopic rod are telescopically matched to enable the drill bit to move up and down, so that the longitudinal excavation direction of the drill bit is controlled, through cooperation, coal mine excavation work of the coal mine roadway rapid tunneling auxiliary device is facilitated, and the coal mine excavation work efficiency is improved.

The invention provides a covering earth balanced safe receiving method of a large-diameter shield tunneling machine. The method comprises the following steps of determining the through posture of the shield tunneling machine, sealing and reinforcing a reinforced area, lowering the water level of the reinforced area, removing a portal of a receiving well, manufacturing a substrate, performing earth filling and watering, enabling the shield tunneling machine to perform tunneling, and receiving the shield tunneling machine. By means of the covering earth balanced safe receiving method of the large-diameter shield tunneling machine, the shield tunneling machine can arrive at the receiving well safely while water and soil pressure balance and effective counter-force are maintained. Besides, a protection measure of an underwater arrival method is adopted for receiving of the shield tunneling machine in order to reduce the construction risk. The method has the advantages of safety and low cost, and can better achieve safe receiving of the shield tunneling machine.

The invention discloses a soil mass stabilization agent and a production method and application thereof. The soil mass stabilization agent is composed of A liquid and B liquid; the A liquid comprisesthe following components of, in parts by weight, 15-25 parts of acrylamide, 0.5-1.5 parts of methylene diacrylamide, 0.4-1.0 part of tetramethylethylenediamine and 70-85 parts of water; and the B liquid is an ammonium persulfate aqueous solution with a mass percent of 0.8-1.6%. Ammonium persulfate is used as an initiator, the acrylamide is used as a polymerization monomer raw material, the methylene diacrylamide and the tetramethylethylenediamine are used as cross-linking agents, and firstly, a curing effect of generated polymer sol is used for making a soil mass solidify to form a whole, so that the soil mass is stabilized, the soil mass stabilization agent has an excellent stabilization effect, and tunneling can be smoothly conducted; and secondly, the generated polymer sol is low in cohesiveness and good in watertightness, and not only are bin pasting of a shield tunneling machine and mud lining of a cutter panel of the shield tunneling machine avoided, but also inflow of the rear portion of a shield tail can be sealed, so that fast tunneling of the shield tunneling machine is achieved, and accordingly the soil mass stabilization agent plays a positive role in tunnel construction.

The invention provides a shield utilization rate prediction and operation parameter optimization method and system based on SVR and PSO. The method comprises the following steps of 1, screening load and operation parameters from machine operation data, and preprocessing the screened data; 2, constructing a data set by using the preprocessed data, the geological type and the utilization rate of each ring, and dividing the data set; 3, establishing a shield utilization rate prediction model by using the SVR and the data set; 4, constructing an optimization equation with the maximum construction progress as a target and operation parameter changes, load changes and geological types as constraint conditions; and 5, obtaining optimal operation parameters under a specific geological type by using an equation established by PSO optimization, so that the construction progress is maximum. According to the method, the utilization rate can be accurately predicted, shield operation can be optimized, safe and rapid tunneling can be achieved, and good engineering application value is achieved.

The invention discloses a deformation control construction method for a building close to a foundation pit. The method comprises the steps: I, conducting deformation protection on the building close to the foundation pit; II, reinforcing isobathic groove walls of a diaphragm wall; III, enclosing the underground diaphragm wall and controlling deformation of adjacent buildings; and VI, reinforcing the pit bottom and the end. According to the construction method, deformation of adjacent buildings can be effectively reduced, safety and normal use of surrounding pipelines and adjacent buildings can be guaranteed, stability of groove walls and smooth construction are guaranteed in the enclosure structure construction process, perfection and smooth tunneling of a shield tunneling machine are guaranteed in the shield station-crossing process, stability of a foundation pit is guaranteed in the foundation pit excavation process, the diaphragm wall has no large deformation, and joints have no water seepage.

The invention discloses a cable installation connection structure of a shield tunneling machine power system and a connection method thereof. The shield tunneling machine power system comprises a ground power supply system, a shield power distribution system and a cable, wherein a relay box is arranged on an annular pushing iron or a pushing system, the cable is divided into a fixed part cable anda movable part cable, one end of the fixed part cable is connected with the ground power supply system, the other end of the fixed part cable is connected with the wire inlet end of the relay box, one end of the movable part cable is connected with the wire outlet end of the relay box, and the other end of the movable part cable is connected with the shield power distribution system. According tothe structure and the method, through the addition of the relay box, on the basis of meeting the safety power utilization specification, the whole original cable is broken into two parts, so that after a section of pipe joint is finished in the tunneling construction, only the cable in the finished pipe joint of a tunnel needs to be disconnected with the wire outlet end of the relay box, the installation and positioning of a next pipe joint can be met, the connection of the construction process is improved, and the smooth tunneling of a rectangular shield tunneling machine is guaranteed.