16results about How to "Increase prestress" patented technology

The invention discloses a hollow grouting combined anchor rod and a construction method, and belongs to the field of roadway surrounding rock shoring, the hollow grouting combined anchor rod comprises an umbrella framework center rod, a nut cover, a rubber sealing washer, an anti-skid gasket, a nut, a tray, a stop-grouting plug and a hollow anchor rod, the umbrella framework center rod is placed in the hollow anchor rod, then the combined anchor rod is placed in a drill hole, and then the hollow anchor rod is placed in the drill hole like umbrella opening. The center rod of the umbrella framework is pulled, the umbrella framework extends out of the hole of the hollow anchor rod and is inserted into the hole wall of a drill hole, the prestress of the anchor rod is increased, the friction force between the rod body and mortar is increased, and then grouting is conducted from the hollow rod body of the center rod of the umbrella framework. According to the method, no complex accessory is arranged, the construction steps are simple, the construction time is greatly shortened, the economic burden is reduced, the pressure of constructors is relieved, and the expected supporting effect can be achieved.

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.

The utility model discloses a post-tensioned prestressed concrete railroad bridge simply-supported beam which comprises a simply-supported beam body, four matching holes are formed in the simply-supported beam body and are divided into two groups, the two groups of matching holes are symmetrically formed relative to the simply-supported beam body, a fixing sleeve is fixedly connected to the interior of each matching hole, and the fixing sleeve is fixedly connected to the interior of each matching hole. A supporting column is arranged in the fixing sleeve, the lower end of the supporting column is fixedly connected with a limiting column, and the end, close to the center of the simply supported beam body, of the limiting column is fixedly connected with a limiting sleeve. In the utility model, the three pre-stressed plates are all made of corrugated steel materials, so that the pre-stress for improving the main body of the simply supported beam can be effectively provided, and the simply supported beam can be effectively reinforced, therefore, the problems of sinking, cracking and the like of old bridges and dangerous bridges can be solved, meanwhile, the bending-resistant and shearing-resistant bearing capacity of the bridges is improved, and the reinforcing effect is obvious.

The utility model belongs to the technical field of pavement structures, and particularly relates to an anti-cracking rib for a pavement cement-stabilized base layer, which is characterized in that a main rib is provided with longitudinal continuous steel bars and transverse continuous steel bars, and is not provided with shrinkage joints in the transverse direction, so that a poured asphalt concrete pavement is good in integrity and high in tensile strength, and a 180-degree hook is arranged at the tail end of each steel bar of a steel bar truss; transverse constructional steel bars should be arranged within the length range of the steel bar truss, the axis of the steel bar truss is tensioned, longitudinal stressed steel bar lap joints of main ribs can be welded firmly after being bound and lapped, the overall steel bar prestress is further improved, and breakage is prevented. The straight thread steel bars are poured into the blind holes of the coarse grain type asphalt concrete layer, and the medicament layer in the blind holes is composed of quartz particles, vinyl resin and a curing agent, so that the straight thread steel bars fixed in the blind holes are reinforced and connected, and the corrosion resistance is improved; the steel bar anti-corrosion layers wrap the peripheries of the main ribs and the steel bar trusses, so that corrosion of infiltrated rainwater to the steel bars is effectively reduced, and the anti-corrosion level of the pavement is improved.

The invention discloses thin-wall hollow composite column manufacturing equipment and a manufacturing method thereof, and relates to the field of constructional engineering, the thin-wall hollow composite column manufacturing equipment comprises a template cavity, a turnover device, a support and a pouring device, the template cavity is defined by a plurality of mold assemblies, the turnover device is composed of a plurality of arcs or semicircles, the turnover device is placed on the support, and the pouring device is arranged on the support. And the turnover device is fixed on the outer side of the mold assembly. When the device is used, the mold and the component are turned over together, the other side of the component can be poured by turning over the device when each side of the component has slight strength, the production efficiency of the component can be greatly improved, the device and the component are turned over together, automatic turning over of the component can be achieved, and industrial production is easy to achieve; the positions of the keels can be adjusted according to the sizes of the components, after the keels are assembled, the formworks are fixed to the keels, production of the components of different sizes can be achieved with low cost, and the mold cost is saved.

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.

The utility model relates to the technical field of bridge pre-stress reinforcing devices, in particular to a bridge pre-stress reinforcing device, which solves the problems that the existing bridge pre-stress reinforcing device is not easy to change the pre-stress and is easy to cause troublesome later maintenance, and comprises a bridge body and bridge piers on two sides, and a plurality of reinforcing devices are mounted at the bottom of the bridge body. Each reinforcing device comprises a steel cable, the two ends of each steel cable are connected with fixing discs, each fixing disc is provided with a plurality of first expansion bolts, each steel cable is provided with a top frame, the bottom of each top frame is provided with a top groove, the top of each top frame is connected with a fixing block, each fixing block is provided with a rotating groove, and each rotating groove is provided with a plurality of first expansion bolts. A rotating groove is formed in the top of each rotating shaft, a rotating block is mounted on each rotating groove, an operating rod is connected to the top of each rotating block, a threaded rod is connected to the top of each operating rod, a threaded cylinder is mounted on each threaded rod, a fixing plate is connected to the top of each threaded cylinder, and a plurality of second expansion bolts are arranged on each fixing plate.

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 T beam prefabricated through a pre-tensioning method. The T beam prefabricated through the pre-tensioning method comprises a beam body. The beam body extends along a first direction; the first left prestress part and the first right prestress part are symmetrically arranged on the beam body in the first direction, a certain included angle is formed between the first left prestress part and the first direction, one end of the first left prestress part is fixed to the end, in the first direction, of the beam body, and the other end of the first left prestress part is fixed to the bottom of the beam body; the first left prestress part and the first right prestress part at least penetrate through the central cross section of the beam body in the first direction. According to the T beam prefabricated through the pre-tensioning method, the engineering cost is saved, the construction procedure is simplified, the production efficiency is improved, and the bearing capacity and prestress in the midspan of the beam body are improved.

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.

The utility model provides a concrete pipe pile reinforcing steel bar connecting structure, which relates to the field of concrete pipe piles and comprises an outer spiral reinforcing steel bar, a reinforcing steel bar ring, a connecting rod and a central pipe, an outer vertical reinforcing steel bar is welded between the outer spiral reinforcing steel bar and the reinforcing steel bar ring, and an inner vertical reinforcing steel bar is welded on the inner side of the reinforcing steel bar ring. And meanwhile, the connecting rods are welded between the inner vertical steel bars and the central pipe, the central pipe comprises a prefabricated cement pipe on the inner layer, the outer side of the prefabricated cement pipe is sleeved with a steel cylinder, and an anti-corrosion coating is arranged on the outer side of the steel cylinder. The utility model solves the problems that the internal radial supporting effect deviation still exists in the steel bar structure related to the existing concrete pipe pile, and the pouring forming process is troublesome.

The invention relates to a transport system (335), a transport device (100) and a track (105). The transport system (335) comprises a running track (105) having a running track section (110) and a movable transport device (100). The first running surface (115) of the running track section (110) has a substantially circular surface (130) and comprises a guide center (135). The guide center (135) substantially forms a geometric circle center (140), the circular surfaces (145) of which each substantially comprise a circular surface (130) of the first running surface (115). A first roller (155) of the transport device (100) rotatably rests on the first running surface (115). A first roller (155) is rotatably mounted (175) on a movable element (170) of the transport device (100). The first roller (155) is designed to perform a pivoting movement (185) along a substantially circular surface (130) of the first running surface (115). The axis of rotation (190) of the movable element (170) and the guide center (135) are arranged substantially at the same height (195).

The invention discloses an underground upward blasthole plug, comprising a plugging head, a lead hole is arranged on the plugging head, a plurality of elastic blades are arranged in the circumferential direction, and the elastic blades include a middle part, a first connecting part and a second connecting part; the thickness of the first connecting part is less than the thickness of the middle part, and is arranged near the bottom surface of the middle part; the thickness of the second connecting part is less than the thickness of the middle part, and is arranged near the top surface of the middle part; the first connecting part of an adjacent elastic blade and the second connecting part of another elastic blade are arranged oppositely; one end of the elastic blade away from the plugging head is inclined relative to the plugging head, and the height of the side where the second connecting part is connected to the middle part is less than the height of the other side; among two adjacent elastic blades, the first connecting part of one elastic blade and the second connecting part of the other elastic blade can overlap by extrusion. The plugging device can effectively prevent the plugging device from moving and prolong the reaction time of the explosive gas.

The invention relates to a pier column top cap steel bar prefabricating and binding construction method, and belongs to the technical field of bridge construction.The method comprises the steps that firstly, a jig frame is arranged in a processing factory, a bottom plate is arranged firstly, then a plurality of stand columns are arranged on the bottom plate, and the middle sections of the stand columns are welded through angle steel to form an annular lower-layer positioning plate; the top ends of the stand columns are welded through angle steel to form an annular upper-layer positioning plate, and the lower-layer positioning plate and the upper-layer positioning plate are parallel to the ground; secondly, steel bars are bound on the jig frame; thirdly, the jig frame and the bound reinforcing steel bars are hoisted to the pier top to be positioned, and construction is conducted in the next step; the reinforcing steel bars are positioned by arranging the upper-layer positioning plate and the lower-layer positioning plate, the reinforcing steel bars are positioned by the two layers of positioning plates connected with the main body structure in a welded mode, the probability of inaccurate positioning caused by deformation is reduced, and the positioning precision is improved.