A tubular structure includes at least one exterior tube and at least one interior tube, at least a portion of the interior tube is disposed within the exterior tube. The tubular structure further includes at least one expansion joint provided between the exterior tube and the interior tube and the expansion joint allows lateral expansion or contraction of the exterior tube and the interior tube and maintains a pressure within the exterior and the interior tubes.

A system for transporting one or more items is provided. The system includes: a transportation tube disposed at least partially underground or at least partially above ground; a transportation pod to secure items therein for transport; a transportation actuator to propel the transportation pod through the transportation tube, the transportation actuator including one or more pumps coupled to the transportation tube and configured to pressurize a fluid medium through the transportation tube such that the pressurized fluid medium propels the transportation pod through the transportation tube; a first access point located proximate a first end of the transportation tube; and a second access point located proximate a second end of the transportation tube. Each of the first and second access points includes an opening configured to allow the transportation pod to be received into or removed from the transportation tube.

A system for transporting one or more items is provided. The system includes: a transportation tube disposed at least partially underground or at least partially above ground; a transportation pod to secure items therein for transport; a transportation actuator to propel the transportation pod through the transportation tube, the transportation actuator including one or more pumps coupled to the transportation tube and configured to pressurize a fluid medium through the transportation tube such that the pressurized fluid medium propels the transportation pod through the transportation tube; a first access point located proximate a first end of the transportation tube; and a second access point located proximate a second end of the transportation tube. Each of the first and second access points includes an opening configured to allow the transportation pod to be received into or removed from the transportation tube.

Provided is a pipe interior inspection robot that has characteristics of having an extremely simple device structure to easily achieve dustproof and waterproof properties, being able to pass through a pipe bent in any direction, and enabling the selection of the advancing direction.

A pipe interior inspection robot for inspecting the inside of a pipe branched from a pipe header, the robot including: 1) a moving means having a structure capable of being introduced from a pipe base, which is an inlet of the pipe header, and capable of moving in the pipe header and being fixed to a pipe wall inside the pipe header at a desired position; 2) a mechanism for specifying a position of a pipe to be inspected; and 3) a mechanism for inspecting a condition inside the pipe to be inspected.

Provided is a pipe interior inspection robot that has characteristics of having an extremely simple device structure to easily achieve dustproof and waterproof properties, being able to pass through a pipe bent in any direction, and enabling the selection of the advancing direction.

A pipe interior inspection robot for inspecting the inside of a pipe branched from a pipe header, the robot including: 1) a moving means having a structure capable of being introduced from a pipe base, which is an inlet of the pipe header, and capable of moving in the pipe header and being fixed to a pipe wall inside the pipe header at a desired position; 2) a mechanism for specifying a position of a pipe to be inspected; and 3) a mechanism for inspecting a condition inside the pipe to be inspected.

An airdock for connecting a transportation vehicle to a loading area in a high-speed, low-pressure transportation system. The airdock includes a pathway for off-loading and loading of passengers and/or cargo to the transportation vehicle. The airdock is operable to maintain the transportation vehicle in a low-pressure environment of the transportation system while providing the pathway through the low-pressure environment.

An airdock for connecting a transportation vehicle to a loading area in a high-speed, low-pressure transportation system. The airdock includes a pathway for off-loading and loading of passengers and/or cargo to the transportation vehicle. The airdock is operable to maintain the transportation vehicle in a low-pressure environment of the transportation system while providing the pathway through the low-pressure environment.

An in-pipe moving apparatus for passing through a pipe bent in any direction without control of the attitude of the apparatus is provided. The in-pipe moving apparatus may include at least three sets of tire-integrated wheel units arranged in series in a traveling direction and at least two sets of joint sections that pivotably link the at least three sets of tire-integrated wheel units to each other. Each of the at least three sets of tire-integrated wheel units includes a tire-integrated wheel, a drive section, a first frame fixed to the drive section, and at least one second frame pivotably attached to the drive section. A bending generator is provided between one of the first frames and one of the second frames in the at least three sets of tire-integrated wheel units and imparts tension for causing the first frames and the second frames to have a V-like bent shape.

An in-pipe moving apparatus for passing through a pipe bent in any direction without control of the attitude of the apparatus is provided. The in-pipe moving apparatus may include at least three sets of tire-integrated wheel units arranged in series in a traveling direction and at least two sets of joint sections that pivotably link the at least three sets of tire-integrated wheel units to each other. Each of the at least three sets of tire-integrated wheel units includes a tire-integrated wheel, a drive section, a first frame fixed to the drive section, and at least one second frame pivotably attached to the drive section. A bending generator is provided between one of the first frames and one of the second frames in the at least three sets of tire-integrated wheel units and imparts tension for causing the first frames and the second frames to have a V-like bent shape.

Transit Cleaning Unit is able to clean the walls, overhead, insulators third rail covers and flooring of the subway systems in a minimum amount of time.

It provides an effective means of providing a clean environment for the benefit of the customers.