When a bridge pier is reinforced or repaired by wrapping a reinforcement around the pier, a waterproof sheet having a sufficient flexibility to attach to and cover the interface between the pier and the reinforcement in a liquid-tight manner is useful. The waterproof sheet is attached to the interface between the pier and the reinforcement to prevent water from penetrating into the interface for thereby preventing the reinforcement from deterioration.

An acquisition section (12) acquires a reflected wave intensity image in which a reflected wave intensity of an electromagnetic wave that has been radiated in a direction through a surface of a reinforced concrete structure toward an interior of the reinforced concrete structure at respective positions on the surface of the reinforced concrete structure is expressed by pixel values of pixels corresponding to each of the respective positions. A setting section (14) sets an evaluation target range in the acquired reflected wave intensity image. A computation section (16) computes a statistical indicator of a type set according to the set range for pixel values in the reflected wave intensity image. An evaluation section (18) evaluates a degree of deterioration of the reinforced concrete structure using the computed values.

A crack repair method includes a build-up welding step of performing build-up welding on a portion of an existing steel structure where a crack is generated while feeding a filler wire, and a laser beam piercing welding step of performing piercing welding using a laser beam on a filler material build-up portion caused by the build-up welding in the build-up welding step and the crack. The crack can be melted and repaired without lowering a toughness value regardless of an operation condition.

A crack repair method includes a build-up welding step of performing build-up welding on a portion of an existing steel structure where a crack is generated while feeding a filler wire, and a laser beam piercing welding step of performing piercing welding using a laser beam on a filler material build-up portion caused by the build-up welding in the build-up welding step and the crack. The crack can be melted and repaired without lowering a toughness value regardless of an operation condition.

A steel deck bridge evaluation device is provided to enable quantitative evaluation of damage to or deterioration within a steel deck bridge.

A steel deck bridge evaluation device includes a processor, the processor is configured to acquire reflected response data relating to a reflected response to an electromagnetic wave irradiated through a surface a deck in a depth direction of the deck, remove a first frequency component obtained by reflection of the electromagnetic wave at a surface of the deck and a second frequency component obtained by reflection of the electromagnetic wave at a steel deck from a reflected response frequency distribution of the reflected response expressing the reflected response data, and evaluate damage to or deterioration of the deck using a peak measurement value that is a peak value of a frequency component level corresponding to a specific frequency or higher, in the reflected response frequency distribution from which the first frequency component and the second frequency component have been removed.

A displacement measurement device includes: a first machine learning model trained to generate, from one image which contains a subject and has noise, at least one image which contains the subject and which has noise or has had noise removed; a first obtainer that obtains a first image which contains the subject and has noise and a second image which contains the subject and has noise; a first generator that, using the first machine learning model, generates M template images containing the subject from the first image and generates M target images containing the subject from the second image, M being an integer of 2 or higher; a hypothetical displacement calculator that calculates M hypothetical displacements of the subject from the M template images and the M target images; and a displacement calculator that calculates a displacement of the subject by performing statistical processing on the M hypothetical displacements.

An apparatus includes an acquisition means for acquiring the displacement quantity in a time-series manner, the displacement quantity being generated at a measurement part of a structure by the weight of a vehicle that travels on the structure, a detection means for detecting the position and the clock time of the vehicle that travels a pre-passage area of the measurement part, an estimation means for estimating the arrival time that the vehicle arrives at the measurement part, from the position of the measurement part and the position and the clock time of the vehicle, and a control means for controlling the acquisition means on the basis of the estimated arrival time.

A control device for bridge vortex vibration comprising a control unit arranged at a bottom of a bridge. The control unit includes several controllers which include a base and several sliding sheets. The base is formed with a sliding groove along the length direction. A wedge block is slidably provided in the sliding groove. Each side of two sides of the base is provided with several sliding holes. Each of the sliding sheets is arranged in a corresponding one of the sliding holes. An end of each of the sliding sheets is provided with a wedge surface matched with the wedge block. A bottom of each of the sliding sheets is provided with a wind shielding structure. The object of the disclosure is to solve the technical problem of possible vortex vibration of a bridge under the condition of a low wind speed.

Disclosed are a reinforcing and lifting method and a reinforcing and lifting structure for large-scale piers of high-speed rail. The method comprises: obliquely drilling grouting holes for a pile shoe body downward around the bridge pier cap, the hole bottom goes deep into a pile foundation side position close to the bottom end of the bridge pier pile foundation, grouting the hole bottom, and reinforcing the soil body between a plurality of pile foundations and around the pile foundations to form the pile shoe body; vertically drilling holes downward around the bridge pier cap to form a plurality of curtain holes at intervals, and grouting the curtain holes to form an enclosed curtain wall, the curtain wall and the pile shoe body form an inverted groove structure; obliquely drilling holes downward to form lifting holes, such that the bridge piers are gradually raised to a preset height.

Disclosed are a reinforcing and lifting method and a reinforcing and lifting structure for large-scale piers of high-speed rail. The method comprises: obliquely drilling grouting holes for a pile shoe body downward around the bridge pier cap, the hole bottom goes deep into a pile foundation side position close to the bottom end of the bridge pier pile foundation, grouting the hole bottom, and reinforcing the soil body between a plurality of pile foundations and around the pile foundations to form the pile shoe body; vertically drilling holes downward around the bridge pier cap to form a plurality of curtain holes at intervals, and grouting the curtain holes to form an enclosed curtain wall, the curtain wall and the pile shoe body form an inverted groove structure; obliquely drilling holes downward to form lifting holes, such that the bridge piers are gradually raised to a preset height.