9results about How to "Reduce side pressure" patented technology

The invention discloses a construction method for excavating an upside-down well wall of a deep foundation pit under an eccentric compression working condition. The construction method is suitable for an asymmetric load scene that the soil covering height of one side of a vertical shaft is obviously larger than that of the other side of the vertical shaft. The method comprises the steps that firstly, grouting is conducted on the periphery of the shaft wall of a vertical shaft under the current ground, and a soil body reinforcing area is formed; then, a mouth locking ring beam is constructed at a shaft mouth of the vertical shaft, an upper structure comprising a retaining wall, a reverse pressing plate, a retaining wall ring beam and a plate support is upwards constructed on the mouth locking ring beam, and soil covering side earthwork is synchronously backfilled to the level ground elevation in the construction process; next, an upside-down well wall method is adopted for subsection downward excavation, an annular arch frame, angle braces and anchor rod supports are constructed after each section is excavated, and an upper ring beam and a lower ring beam are arranged at the horsehead position and connected with the adjacent arch frames through vertical supports; and finally, concrete bottom sealing is conducted on the shaft completion face. The anti-overturning moment is formed through the reverse pressing plate and synchronous backfilling, and the problem of well wall instability caused by eccentric loads is effectively solved in combination with a multi-stage supporting system.

The present application relates to the technical field of thin-walled part forging, and particularly provides a thin-walled part bending forging process, which comprises the following steps: heating a bar to a preset temperature to obtain a blank; forging the blank into a flat blank; forging the flat blank into a bowl-shaped structure in a first die to obtain a thin-walled bowl-shaped part; bending the thin-walled bowl-shaped part to form a thin-walled rough part; and forging the thin-walled rough part in a second die to obtain a target thin-walled part. The thin-walled part bending forging process can make the flat blank extend in the opposite direction of the movement direction of the movable die of the first die during the forging process, so that the flat blank is more likely to fill the first die, which is beneficial to improving the integrity and uniformity of the forged part, effectively reducing the forming difficulty of the vertical thin-walled part, and reducing the lateral pressure and Y-direction pressure borne by the die, so that stress concentration is not easily formed, and the service life of the die is significantly improved.

The present application relates to the field of anti-seepage dam construction, and discloses a dam body structure of a soil-rock cofferdam back slope type anti-seepage dam and a construction method thereof, which comprises a foundation, a dam body is arranged on the upper side of the foundation, a drainage cavity is formed in the dam body, an installation plate is fixedly connected to the inner wall of the drainage cavity, a plurality of drainage cylinders are rotatably connected to the installation plate, a driving mechanism matched with the drainage cylinders is arranged in the drainage cavity, a connecting pipe is arranged on the inner wall of the drainage cavity, a plurality of rotary joints are arranged on the connecting pipe, the drainage cylinders are rotatably connected to the inner wall of the rotary joints, and drainage pipes are fixedly connected to the two ends of the connecting pipe, and flow valves are arranged on the drainage pipes. In the present application, the driving mechanism is arranged to drive the drainage cylinders to rotate and drain water, and the adjustable flow valves can actively and quickly drain the water accumulated around the dam body, effectively reduce the water pressure around the dam body, reduce the lateral pressure borne by the dam body, and improve the stability of the dam body.

The utility model relates to the technical field of building construction, in particular to a stable building construction formwork support which comprises a supporting rod, a stabilizing mechanism is fixedly connected to the middle of the outer surface of the supporting rod, a bottom plate is fixedly connected to the lower end of the supporting rod, and a rotary knob is connected to the front-middle-upper portion of the outer surface of the supporting rod in a penetrating and threaded mode. According to the stable building construction formwork support, when mass concrete is poured, the generated weight can be dispersed to a larger ground area through the stabilizer bar, overload of a certain part of the formwork support caused by concentrated stress is avoided, the risk of collapse of the formwork support is reduced, and the formwork support is not prone to falling off when encountering lateral force such as strong wind and earthquakes. The overall stability of the formwork support can be enhanced through the load dispersing effect of the stabilizer bar, lateral force is dispersed and transmitted to the ground through the stabilizer bar, the lateral pressure borne by the supporting bar is reduced, the formwork support is prevented from inclining or turning over due to the fact that the lateral force is too large, and therefore the possibility of safety accidents is reduced.

The invention provides a construction method of a fair-faced ultra-high-performance precast concrete wall. The construction method specifically comprises the following steps that a square concrete pouring mold with an upward opening is formed by one face mold plate and four side mold plates of a pouring mold of the prefabricated concrete wall, and a reinforcement cage is placed to pour UHPC concrete till the thickness of the UHPC concrete reaches 20%-80% of the design thickness of the prefabricated concrete wall; after pouring is completed, curing forming is conducted, the four side formworks are disassembled, the other side formwork and the four side formworks are reassembled to form a new upper opening type mold, UHPC concrete of the same formula is poured till the thickness of the UHPC concrete is 80%-20% of the design thickness of the prefabricated concrete wall, the formed first half concrete wall and the bottom mold are turned by 180 degrees, and the bottom mold is turned by 180 degrees; and the exposed reinforcement cage is vertically and downwards inserted into the new concrete pouring mold and is integrally formed and maintained with the newly poured concrete, and finally supplementary pouring is conducted on the center joint. By means of the innovative technology combining multi-time pouring and overturning, the problems of internal bubbles, surface defects and steel bar positioning of the UHPC wall are effectively solved.

The invention relates to the technical field of supporting structures, in particular to an SMW construction method pile supporting structure based on a deep foundation pit in a soft soil area and a construction method thereof.The SMW construction method pile supporting structure comprises an equipment body and is characterized in that a starting machine is arranged on the outer side of the equipment body, a pile column is arranged at the bottom of the starting machine, and a limiting stopper is fixedly connected to the outer side of the bottom of the equipment body; a mounting bolt is arranged on the outer side of the equipment main body, a supporting range adjusting mechanism is arranged on the outer side of a limiting stopper, the supporting range adjusting mechanism comprises a stabilizing plate, a connecting plate is fixedly connected to the top of the stabilizing plate, and a motor is fixedly connected to the outer side of the connecting plate. The supporting requirements of different foundation pit excavation depths and boundaries can be accurately met through the supporting range adjusting mechanism capable of being flexibly adjusted, soil body side pressure caused by soft soil thixotropy and rheology is effectively buffered in cooperation with the damping assembly, and the defect that soft soil is low in shear strength is overcome through a multiple supporting system.

The utility model discloses a chain conveyor protective fence structure relates to the technical field of protective equipment for conveyor, including setting in the both sides of conveyor belt two main guard board, the top of main guard board is equipped with the locating groove, the top of main guard board is provided with the water guide plate, and the water guide plate is the arc plate of higher both ends of higher middle part, and the both ends fixed connection block of water guide plate's bottom, the bottom of connection block is fixed with the locating block of being inserted in the locating groove, and the both ends of water guide plate extend to two main guard board side; The both ends fixed two riser plates of water guide plate top, and the top of riser plate is fixed with sunshade, and the sunshade is the arc plate of higher both ends of lower middle part, and the sunshade's middle part is equipped with the downspout of going through, and the one end of riser plate near water guide plate is equipped with the water outlet groove; Be provided with the lifting plate for increasing the height of water guide plate, build the rain -proof drainage system, and the height of protective fence can be adjusted according to the height of actual transmission material.

This invention discloses a controllable negative pressure grouting test device, comprising a grouting model assembly, which includes a grouting bucket, a fixing unit, a first limiting unit, and a sealing unit; a filtering unit located at the lower part of the inner cavity of the grouting bucket; a second limiting unit located at the upper part of the inner cavity of the grouting bucket to limit the height of the sample inside the grouting bucket and prevent the sample from floating; a fastening unit located on the outer circumference of the grouting bucket to provide circumferential constraint; a negative pressure component connected to the upper end of the grouting model assembly to generate negative pressure and expel air from the grouting model assembly; and a grout delivery component connected to the lower end of the grouting model assembly to allow grout to flow into the grouting bucket when the negative pressure component generates negative pressure. This invention features a simple device, easy operation, strong anti-interference capability, and can effectively improve work efficiency and ensure the accuracy of the test.

The invention discloses a waste heat recovery heat exchanger and a small gas turbine. Comprises: a housing arranged in an annular shape; the multiple heat exchange pipes extend in the axis direction of the shell, and the multiple heat exchange pipes are tightly arranged in the shell; a first channel used for flowing of a low-temperature medium is formed in the heat exchange pipe, an opening of the first channel is formed in the end face of the shell, a second channel used for flowing of a high-temperature medium is formed outside the heat exchange pipe, and an opening of the second channel is formed in the side face of the shell. And the low-temperature medium and the high-temperature medium exchange heat through the pipe wall of the heat exchange pipe. The compact degree and the heat exchange efficiency of the heat exchanger can be improved, and the flow resistance can be reduced.