Kubota Corporation

Daifuku Co., Ltd.

Shozo Kishi

Keita Oda

Takaaki Kagawa

Kohei Ikeda

Ryunosuke Tanaka

Yuito Komaru

Takashi Yokomizo

Yoshinori Itani

Shogo Kaneko

Masataka Shimomura

Kazuya Ito

Kazuma Harada

Daichi Higasa

Koji Kamachi

Ko Ishimura

Kento Higashi

Yutaka Fujimoto

Tamon Iden

Akira Yamashita

Hideki Nakaya

A pipe joint is provided in which a seal member insertion spaceis formed between a first tapered surfaceof a socketand an outer circumference of a spigot, a seal memberis inserted into the seal member insertion space, and a glandthat presses the seal memberinto the seal member insertion spaceis externally fitted to the spigot. The seal memberhas a bulb partat one end part thereof. A guide partthat guides the bulb partfrom an opening end faceof the socketinto the seal member insertion spaceis formed on the inner circumference of the socket. The guide parthas a second tapered surface. An angle of inclination of the second tapered surfaceis greater than an angle of inclination of the first tapered surface

Pipe joint, gland, and method for joining pipes

A pipe joining method includes a moving of a first transport trolley with a loaded first pipe and a second transport trolley with a loaded second pipe forward, a joining of one end of the first pipe to another end of a rearmost pipe of a pipeline, a lifting of another end of the first pipe, a moving of the first transport trolley and the second transport trolley backward, a drawing of the first transport trolley from beneath of the first pipe to the near side, a removing of a coupler to separate the first transport trolley and the second transport trolley, a moving of the first transport trolley backward, a drawing of the first transport trolley below the second pipe loaded on the second transport trolley, and a moving of the second transport trolley forward with the first transport trolley.

Pipe transport device and pipe joining method inside pipeline construction shaft

A watertightness testing method for testing watertightness of a joined section () where one end section of a second pipe () is joined to a first pipe (), the watertightness testing method including: inserting a testing device body () into the first pipe (); attaching an assembling device () to another end section of the second pipe (); attaching a pulling device () to the assembling device () and connecting the pulling device () to a strap-shaped member () having been wound in advance around an outer circumference of the first pipe (); operating the pulling device () and pulling the strap-shaped member () in a separating direction of the second pipe () to have a reaction force generated in the second pipe () cause the second pipe () to be pulled in a joining direction (G), the one end section of the second pipe () to be inserted into the first pipe (), and the second pipe () to be joined to the first pipe (); and operating a moving operation rod () provided in the testing device body () from outside of the other end section of the second pipe () in a state where the second pipe () is being pulled in the joining direction (G) to move the testing device body () to the joined section ().

Watertightness testing method and assembling device

In a pipe joint, a spigot is inserted into a socket; a lock ring is accommodated in a lock ring-accommodating groove formed in the inner circumference of the socket; and an engaging part formed in the outer circumference of the spigot, wherein the engaging part engages with the lock ring from a back side of the socket in a separation direction A of the spigot, thereby preventing the spigot from separating from the socket. The engaging part is formed at a position receding from a distal end of the spigot in the separation direction A of the spigot. A bending suppressing member for restricting the socket and the spigot in a bending direction C is provided between the inner circumference of the socket and the outer circumference of the spigot in the range between the distal end of the spigot and the engaging part.

Pipe joint

Provided is a bending angle calculation method capable of saving a worker time and effort. The bending angle calculation method includes: an image capturing step (S) of capturing an image of a pipe in which a first pipe and a second pipe are joined together by a joint; a derivation step (S) of deriving, from the image, a laying direction straight line corresponding to a laying direction of the pipe; and a calculation step (S) of calculating, as a bending angle at the joint, a crossing angle between a laying direction straight line of the first pipe and a laying direction straight line of the second pipe.

Bending angle calculation method and calculation apparatus

A ring body to be provided in a pipe joint which can prevent a spigot from separating from a socket by a spigot protrusion engaging with a lock ring from the back side of the socket in the separation direction A of the spigot. The ring body includes a main body part which is inserted into between the inner peripheral surface of the socket and the outer peripheral surface of the spigot to be provided in the pipe joint, and a deviation prevention member that prevents the main body part from deviating to the opening end side of the socket, wherein the main body part moves the spigot in the pipe radial direction with respect to the socket, thereby reducing deviation in the pipe radial direction between the pipe axis of a first pipe and the pipe axis of a second pipe.

Ring body, pipe fitting, and method for joining pipes

A watertight testing device includes a cylindrical core fit into a pipe joint part, a first seal member for sealing between the outer surface of the core and the inner surface of one pipe, a second seal member for sealing between the outer surface of the core and the inner surface of the other pipe, a first pressing member for pressing and compressing the first seal member into a first seal-member insertion space, a second pressing member for pressing and compressing the second seal member into a second seal-member insertion space, a moving device for moving the first and second pressing members in a pipe axial direction, and a test fluid feeder for feeding a test fluid into a test space.

Watertight testing device for a pipe joint part

A pipe joint in which a seal body and a spacer are mounted from the insides of pipes, wherein: a spigot of one pipe is inserted into a socket of the other pipe; and an annular accommodation space is formed between the inner circumference of the socket and the outer circumference of the spigot. Inside the accommodation space are accommodated: a seal body for sealing the gap between the socket and the spigot; a push ring that presses the seal body to keep the seal body in a compressed state; and a spacer that maintains the interval between the push ring and the deep end of the socket in the pipe axial direction.

Pipe joint, push ring for pipe joint, method for joining pipes

A pipe-joining centering device aligns, with an axial center of one pipe, an axial center of another pipe when a spigot of the other pipe is to be inserted into a socket of the one pipe. The pipe-joining centering device includes a support member configured to support an end part of the spigot. The support member is tiltable in a pipe radial direction between an inner peripheral surface of the socket and an outer peripheral surface of the spigot. The pipe-joining centering device also includes a position adjustment member configured to tilt the support member in the pipe radial direction. The support member and the position adjustment member are supported on the inner peripheral surface of the socket.

Pipe-joining centering device

A first projection is formed on the outer periphery of a bulb part, a second projection is formed on the socket rear end of the bulb part, a tapered part is formed with a decreasing diameter from the inner periphery of a heel part to the inner periphery of the second projection, and a third projection is formed on the tapered part. A first dimension B from the first projection to the third projection in an inclination direction opposite to an inclination direction G of the tapered part is smaller than a second dimension C from the first projection to the second projection in a radial direction A.

Sealing material and joint

An annular sealing material seals a pipe joint between a socket and a spigot. The sealing material includes a bulb part which is composed of a first bulb, a second bulb located closer to the inner side of the socket than the first bulb, and a narrow part present between the first and second bulbs. The first bulb is pressed against the inner circumferential surface of the socket. The second bulb is pressed against the outer peripheral surface of the spigot. The second bulb is inclined towards the pipe center from the first bulb in a natural state before it is provided between the socket and the spigot. The inner diameter of the second bulb is smaller than the outer diameter of the spigot in the natural state. The second bulb is extensible in the pipe diameter direction due to elastic deformation of the narrow part.

A pipe joint structure provided with: a heel section configured so that a spigot formed on the end section of a pipe is inserted via a seal member into a socket formed in the end section of another pipe and seal member is fitted to a recessed section formed on the inner circumferential section of the socket; and a valve section compressed between the inner circumferential surface of the socket and the outer circumferential surface of the spigot. Additionally, a marker member is provided to the heel section that is accommodated in the recessed section. The socket circumference section of the pipe joint structure is subjected to non-contact inspection by a marker detection device from the spigot-side pipe along the axial direction of the pipe and the quality of the joining state of the pipe joint structure is determined on the basis of whether the marker member is detected.

Growing community of inventors

Amagasaki, Japan

Shozo Kishi