A glued-in-rod wooden structure includes a prepared hole for sealing voids which may be open to the prepared hole. In one example, the prepared hole is filled with an expanding foam which at least partially fills and seals the voids open to the prepared hole. Thereafter, the prepared hole may be enlarged by drilling to its final diameter for receiving the rod. Any voids in the enlarged hole remain sealed by the expanding foam.

The present invention discloses an assembled bamboo sleeper, which is obtained by using a bamboo unit as a raw material, dried and modified at the temperature of 110-180° C., undergone coating treatment using a dopamine solution, adhesive dipping, curing and solidifying, assembling and gluing, further solidifying, further treatment using a dopamine solution, and anti-mildew and/or anti-corrosion and/or anti-insect treatment, and then fastened. The present invention further provides a preparation method for the foregoing bamboo sleeper. The bamboo sleeper prepared in the present invention is green and environmentally friendly, and applicable for ballasted tracks of railways and urban rail transit systems.

The present invention discloses a one-step integrally-formed bamboo sleeper. For the one-step integrally-formed bamboo sleeper, a bamboo unit is used as a raw material, to be dried and modified at the temperature of 110-180° C., and then subject to adhesive dipping, adhesive throwing, solidification, dopamine solution treatment, anti-mildew and/or anti-corrosion and/or anti-insect treatment, and fastening, to obtain the one-step integrally-formed bamboo sleeper with a density of 0.9-1.5 g/cm.sup.3. The present invention further provides a preparation method for the foregoing bamboo sleeper. The bamboo sleeper prepared in the present invention has a suitable elastic modulus, and applicable for ballasted tracks of railways and urban rail transit systems.

The present invention relates to a composite wood arrangement comprising construction components (1) mechanically joined together in a parallel position. Such a construction component comprises at least one profiled side surface (2, 3) and, connecting them together, at least one edge surface (4, 5) and end surfaces (6, 7), perpendicular to the longitudinal axis (11) of the construction component. In the invention, the side surfaces in parallel construction components are adapted in an opposite position in pairs so that profile crests (8) and throughs (9) in opposite side surfaces are substantially parallel. There are these construction components (1) adapted successively in their longitudinal direction and adjacently in at least the lateral direction of the composite wood arrangement to establish a uniform plate-like structure, whereby the construction components are joined together by mechanical joining means.

One or more collars are configured to center a rod within a drilled hole in glued-in-rod (GIR) structures. The one or more collars fit over an end and/or along a length of the rod that gets inserted first into the drilled hole. The one or more collars may include splines or other features extending from a base of the collar. The features contact walls of the drilled hole to center the rod in the hole, while at the same time allowing fluid such as glue to pass around the collar as the collar and rod are inserted into the hole.

The present invention discloses a one-step integrally-formed bamboo sleeper. For the one-step integrally-formed bamboo sleeper, a bamboo unit is used as a raw material, to be dried and modified at the temperature of 110-180 C., and then subject to adhesive dipping, adhesive throwing, solidification, dopamine solution treatment, anti-mildew and/or anti-corrosion and/or anti-insect treatment, and fastening, to obtain the one-step integrally-formed bamboo sleeper with a density of 0.9-1.5 g/cm.sup.3. The present invention further provides a preparation method for the foregoing bamboo sleeper. The bamboo sleeper prepared in the present invention has a suitable elastic modulus, and applicable for ballasted tracks of railways and urban rail transit systems.

A hole expansion device includes a cutting portion main, body formed to have a diameter for the cutting portion, main body to be housed within a joint hole and including a cutting blade tool movable in a range from a housed position at which a blade is housed within a diameter for the cutting portion main body to an extended position at which the blade projects out of the diameter, an advancing and retracting member that is constructed to move in an axial direction by an external force and rotate about an axis of the advancing and retracting member, and a link mechanism that converts an advancing and retracting movement of the advancing and retracting member into a rotational movement of the cutting blade tool.

A hole expansion, forming device includes a cutting portion main, body formed to have a diameter for the cutting portion, main body to be housed within a joint hole and including a cutting blade tool movable in a range from a housed position at which a blade is housed within a diameter for the cutting portion main body to an extended position at which the blade projects out of the diameter, an advancing and retracting member that is constructed to move in an axial direction by an external force and rotate about an axis of the advancing and retracting member, and a link mechanism that converts an advancing and retracting movement of the advancing and retracting member into a rotational movement of the cutting blade tool, a tip portion bearing that is provided on a tip end of the cutting portion main body, and serves as a tip end side bearing when being housed in an inner side of the joint hole.

A mushroom head reinforcement made of wood-based material for supporting and/or carrying timber building panels in building structures, having a base body with an upper surface, a lower surface facing away from the upper surface, and an opening extending from the upper surface to the lower surface. The mushroom head reinforcement has at least one cavity extending over at least part of the upper surface, which is equipped to be filled with an adhesive and to comprise an adhesive layer. In addition, a flat floor ceiling system has the mushroom head reinforcement, support pillars and floor ceiling panels, as well as a method for erecting the system.