6results about How to "Increase prestress" patented technology

This invention relates to the field of oilfield thermal recovery well technology, and discloses a well completion process device, a column-type ground anchor, and a method for increasing the prestress of the oil layer casing. The well completion process device includes a surface casing (1) located below the surface, an oil layer casing (2), and a casing head body (3). The oil layer casing is connected to the inner surface of the casing head body via a connecting assembly (40). A column-type ground anchor (500) is connected to the bottom of the oil layer casing. The column-type ground anchor includes an anchor claw (502) and a plunger body (530). A liquid outlet (501) is formed on the column-type ground anchor. The anchor claw can extend out of the side wall of the plunger body and insert into the formation. Cement can be discharged from the liquid outlet to seal the annular gap between the oil layer casing and the formation. This invention uses hydraulic oil to insert the anchor claw into the formation, pulling the oil layer casing to a preset load. After the oil layer casing is pulled up, it is clamped to the inner wall of the casing head body via the connecting assembly, thus increasing the prestress.

This invention provides a grouting reinforcement device for unstable rock masses in mines. Compared with existing technologies, vertical grouting grooves are opened at the top of both the secondary unstable rock and the parent rock, and an inclined grouting groove is opened at the bottom of the secondary unstable rock. Vertical and inclined insertion tubes are inserted into the vertical and inclined grouting grooves, respectively. The studs at the bottom of the vertical insertion tubes can be locked with the screw holes of the inclined insertion tubes, thereby locking the three insertion tubes in the secondary unstable rock and the parent rock. A secondary locking connection is made through the internal insertion columns and inclined rods to enhance the stability after connection and cope with the prestress of the secondary unstable rock. Concrete grout is added into the vertical and inclined grouting grooves through the grouting holes on the surface of the vertical and inclined insertion tubes. After solidification, the outer ends of the secondary unstable rock and the parent rock are locked by external fixing components. Anchor ropes are wrapped around the fixing rings at the top of the vertical and inclined insertion tubes to further strengthen the prestress of the secondary unstable rock from the outside.

This utility model relates to a fixing structure for a photovoltaic power station on a concrete flat roof, belonging to the field of photovoltaic power station fixing technology. The photovoltaic power station includes multiple photovoltaic brackets arranged in a straight line at equal intervals. The two mounting ends of the photovoltaic brackets are respectively fixed to two concrete counterweights, which are fixed to the roof. A concrete parapet wall is set on each side of the photovoltaic bracket arrangement direction, and the concrete counterweights are fixed to the roof. The two ends of the fastening cables are respectively fixed to the two concrete parapet walls, and the fastening cables are fixedly connected to all the concrete counterweights. This solves the problem of insufficient load-bearing capacity of the current roof for photovoltaic power stations.

This invention discloses a construction structure and method for easy-to-use, non-removable quick-closing mesh for post-pouring strips, relating to the field of building construction technology. It includes a reinforcing steel skeleton, with a water-stop steel plate horizontally distributed at the top. A set of closing mesh is stacked at both ends of the water-stop steel plate. Several clips are fixedly installed on the side of each closing mesh. The lower clips are welded and fixed to the top of the reinforcing steel skeleton, providing support and fixation for the lower closing mesh, while the upper clips are welded and fixed to the top of the water-stop steel plate, providing support and fixation for the upper closing mesh. Each closing mesh has a prefabricated component in the middle for creating a prefabricated water-stop groove in the concrete layer. This invention provides a construction structure and method for easy-to-use, non-removable quick-closing mesh for post-pouring strips, offering high structural strength and multiple operational functions.

The utility model discloses a side slope pre-stressed anchor monitoring device which comprises pre-stressed anchors distributed on the surface of a side slope in an array mode, a first monitoring assembly is arranged between every two adjacent pre-stressed anchors in the vertical direction, and each first monitoring assembly comprises a movable rod and a detection base. The movable rod and the detection seat are fixedly arranged on two adjacent pre-stressed anchors in the vertical direction respectively, the detection seat is provided with a conical hole, a first detection element is arranged on the inner wall of the conical hole, the movable rod penetrates through the conical hole, and a check block matched with the conical hole in structure is arranged at the end, close to the detection seat, of the movable rod. And when two adjacent pre-stressed anchors in the vertical direction have relative displacement, the stop blocks can be plugged into the conical holes and extrude the first detection elements. The device has the beneficial effects that when relative displacement occurs between the two pre-stressed anchors in the vertical direction, the first detection element in the conical hole is extruded through the check block, and the landslide phenomenon of the side slope can be fed back in time.

The invention discloses a two-way prestress overlap-reducing composite floor system which comprises a pre-tensioning prestress precast concrete bottom plate, weight reducing blocks, cast-in-place concrete ribs and post-tensioning prestress steel bars. Longitudinal prestressed load-bearing steel bars and transverse distribution steel bars are arranged in the pre-tensioned prestressed precast concrete bottom plate. A concrete reinforcing rib or a steel truss reinforcing rib or a steel and concrete combined structure reinforcing rib is arranged on the concrete bottom plate; the weight reducing blocks are laid on the pre-tensioned pre-stressed precast concrete bottom plate, and the weight reducing blocks are spaced by a certain distance. A plurality of pre-tensioned pre-stressed precast concrete bottom plates are assembled together, and concrete ribs are formed after the weight reducing blocks are cast in place. The prestressed steel bars are post-tensioned in the concrete ribs, and after the concrete reaches the strength, the steel bars are tensioned to form post-tensioned prestressing force to form bonded or unbonded prestressing force. According to the device, the consistency of the two-way rigidity of the floor system can be achieved through the two-way prestress, the two-way force transmission performance and the two-way anti-cracking effect are better, the integrity of the floor system is better, and more steel materials are saved.