| Patents for E21D 9 - Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries (7,097) |
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| 11/21/1991 | EP0456824A1 Deformed shield driving method and excavator therefor |
| 11/21/1991 | DE4015492A1 Full-section tunnel driving machine - is for shield driving mining roadways and has set of pilot driving heads supplemented by swinging drills on pivoted arms |
| 11/21/1991 | DE4015462A1 Verfahren und maschine zum vortreiben von strecken, tunneln o. dgl. Method and machine stretch to propel from, tunnel o. The like. |
| 11/18/1991 | WO1991018184A1 Mobile continuous mining machine |
| 11/18/1991 | CA2083181A1 Mobile continuous mining machine |
| 11/15/1991 | WO1991018185A1 Method and machine for excavating drifts, tunnels, stopes, caverns or the like |
| 10/31/1991 | WO1991016525A1 System for controlling direction of underground excavator |
| 10/31/1991 | WO1991016524A1 Method of excavating tunnel |
| 10/29/1991 | US5061120 Direction correcting device for shield tunnelling machine |
| 10/29/1991 | US5060405 Material moving apparatus |
| 10/17/1991 | WO1991015657A1 Injection drilling anchor |
| 10/17/1991 | WO1991015656A1 Injection bore anchor with conveyor screw |
| 10/16/1991 | EP0451683A2 Propulsion process of buried pipe |
| 10/09/1991 | EP0451116A1 Improved telescopic double shield boring machine |
| 10/08/1991 | US5054858 Selectively phased water supply of a cutter head |
| 10/08/1991 | CA1290318C Pipe burster |
| 10/07/1991 | WO1991015653A1 Ring clamp for a cutter ring in a tunnel drilling machine |
| 10/03/1991 | WO1991014851A1 Propelling system in small diameter pipe propeller |
| 10/03/1991 | CA2039261A1 Telescopic double shield boring machine |
| 10/02/1991 | EP0449581A1 Shield tunnelling apparatus |
| 10/02/1991 | CN2085853U Template hole cutting device without expansion for gallery drifting |
| 10/02/1991 | CN1055036A Breakthrough protection technique, technology and facility for controlled off-load blasting in deep hole |
| 10/02/1991 | CN1055035A Underground trolley road construction method |
| 09/24/1991 | US5051033 Bracing device for a self-advancing shield tunnelling machine |
| 09/24/1991 | US5051032 Method and apparatus for continuously excavating shaft and tunnel |
| 09/24/1991 | US5050934 Shearing machine with roof-bolt drilling and setting devices |
| 09/19/1991 | WO1991014079A1 System for detecting position of underground excavator and magnetic field producing cable |
| 09/19/1991 | WO1991014078A1 Method and system for detecting collapse of natural ground in shield driving method |
| 09/19/1991 | WO1991014077A1 System and method for transmitting and calculating data in shield machine |
| 09/18/1991 | EP0446360A1 Position detecting device for underground excavator |
| 09/17/1991 | CA1289064C Wellhead seal assembly |
| 09/11/1991 | EP0414891A4 Method and device for trench-free laying of pipelines |
| 09/11/1991 | CN1013891B Cutter bit and tip |
| 09/10/1991 | US5046783 Tunnel boring machine |
| 09/05/1991 | DE4006629A1 Amphibian road tunnel - has angled tube to connect guide unit and tunnel tube |
| 09/04/1991 | CN1013787B Circular heading machine |
| 08/13/1991 | US5039253 Method for trenchless laying of pipes and an arrangement for carrying out the method |
| 08/08/1991 | WO1991011591A1 Method of assembling segments to line tunnel inner wall and segment assembling apparatus |
| 07/30/1991 | WO1991011563A1 Method of and apparatus for laying pipes |
| 07/30/1991 | CA1286887C Sewer renovation |
| 07/27/1991 | WO1991011588A1 Ring cutter for tunnel drilling in rock |
| 07/27/1991 | CA2074531A1 Ring cutter for tunnel drilling in rock |
| 07/25/1991 | DE4001949A1 Pressure monitor for cement injection point behind tunnelling machine - by extrapolating from pressure differences measured at points along cement delivery pipe |
| 07/16/1991 | US5032039 Underground excavator |
| 07/11/1991 | DE3937676A1 Method of tunnelling in sandy soil - involves using cylindrical shield with conical bore |
| 07/10/1991 | EP0436187A1 Loading installation for loading bulk material |
| 06/26/1991 | EP0434648A2 Tunnel boring machine |
| 06/26/1991 | EP0433963A1 Machine for enlarging a tunnel, a pilot hole or the like |
| 06/26/1991 | EP0433440A1 Pipe connection for advance working pipes laid underground by an advance working technique. |
| 06/25/1991 | US5026218 Temporary roof support cylinder |
| 06/19/1991 | EP0432901A1 Method and apparatus for excavating a shaft and tunnel |
| 06/19/1991 | CN1052353A Shield tunnelling machine |
| 06/13/1991 | WO1991008271A1 Improved process for stabilising rock and/or filling hollows, e.g. in tunnel building and mining |
| 06/13/1991 | DE4038776A1 Driving tunnel where rock face breaks away - involves oblique driving of anchor rods into solid roof rock and fixing ends in reinforced lining |
| 06/12/1991 | EP0431909A1 Improvements in and relating to forming a passageway through the ground |
| 06/12/1991 | EP0431293A1 Shield tunneling machine |
| 06/12/1991 | CN1052167A Driving hole devise in soil layer |
| 06/06/1991 | DE3940088A1 Verbessertes verfahren zur gesteinsverfestigung und/oder hohlraumverfuellung zb im tunnel- und bergbau Improved methods for rock solidification and / or hohlraumverfuellung eg tunnels and mining |
| 05/23/1991 | CA2030180A1 Tunnel boring machine |
| 05/22/1991 | EP0427848A1 Method and device for locating branches in drains |
| 05/21/1991 | US5017045 Method and apparatus for controlling attitude of shield excavator |
| 05/15/1991 | EP0328608B1 Process and device for subsequent incorporation of an underground seal under a refuse dump |
| 05/08/1991 | EP0425552A1 Cutter bit and tip. |
| 05/08/1991 | EP0305415B1 Mobile pump installation |
| 05/08/1991 | CN1051225A Well drilling and finishing process for radial wells inside well |
| 05/07/1991 | US5013189 Intermediate pipe-jacking apparatus |
| 05/02/1991 | EP0424779A1 Self-propelled equipment to bore in tunnels |
| 05/02/1991 | EP0424768A1 Device to feed reinforcement rods |
| 05/02/1991 | EP0424733A1 Device to load reinforcement rods |
| 05/02/1991 | DE3935516A1 Advancing shield with formwork for tunnel lining - has projecting upper shield and formwork at leading edge of hinged structure with follower section |
| 04/30/1991 | US5010965 Self-propelled ram boring machine |
| 04/26/1991 | WO1991006798A1 Method for the mounting of underground pipelines |
| 04/26/1991 | CA2070417A1 Method for the mounting of underground pipelines |
| 04/25/1991 | DE3940489C1 Cutting tool for tunnelling machine - has central advance drill at end o swinging arm attached to drill base with tool bearing arms |
| 04/25/1991 | DE3935033A1 Driving shield with working face chamber - has bulkhead with openings giving access for different equipment |
| 04/18/1991 | WO1991005141A1 Tunnel drilling apparatus and method to remove drill waste |
| 04/18/1991 | WO1991005139A1 Method and apparatus for drilling a tunnel |
| 04/18/1991 | CA2066051A1 Tunnel drilling apparatus and method to remove drill waste |
| 04/11/1991 | DE4031072A1 Shield seal for tunnelling machines - has at least two elastomer blades pointing against direction of movement and by space filled with e.g. bentonite |
| 04/11/1991 | DE3936801C1 Method of driving tunnel - involves forming chamber by bulkhead in which milling disc operates to cut face and loosen earth |
| 04/09/1991 | US5006017 Method for improving ground of large section area |
| 04/09/1991 | US5005911 Quadrishoe tunnel boring machine |
| 04/04/1991 | WO1991004393A1 Device for fixing disk cutter to tunnel excavator |
| 04/03/1991 | CN1050428A Shield unit |
| 03/28/1991 | WO1991005140A1 Drilling apparatus and method for its control |
| 03/28/1991 | WO1991005138A1 Control method and control equipment for drilling apparatus |
| 03/28/1991 | CA2066217A1 Control method and control equipment for drilling apparatus |
| 03/28/1991 | CA2066168A1 Drilling apparatus and method for its control |
| 03/26/1991 | CA1282054C Disc cutters for rock working machines |
| 03/21/1991 | WO1991003708A1 Position detecting device for underground excavator |
| 03/20/1991 | EP0418162A1 Process for constructing structures, in particular railway underpasses |
| 03/13/1991 | EP0416184A1 Muddy water processing apparatus |
| 03/12/1991 | US4998777 Coal-cutting machine having horizontally swivellable jib boom and vertically swivellable loading means |
| 03/12/1991 | US4998776 Shield tunneling with optional section and machine |
| 03/06/1991 | EP0414891A1 Method and device for trench-free laying of pipelines |
| 02/28/1991 | DE3927894A1 Injecting multi-reagent resin into rock - by pumping them in constant proportions from separate tanks through identical pipe lines to valves and then static mixer before injecting |
| 02/21/1991 | WO1991002140A1 Closed type shield machine |
| 02/13/1991 | EP0412092A1 Method and apparatus for the production of underground pipelines. |
| 02/06/1991 | EP0411278A1 Method and apparatus for destroying an underground pipe |
| 02/06/1991 | CN1049045A Shield type tunnel machine |