49results about How to "Simple and safe construction" patented technology

The present invention discloses a method for reduction of beam section height by use of unbonded steel strand prestress, the method comprises reduction of the beam section height by use of external prestress and reduction of the beam section height by use of internal prestress, when the number of desired steel strands is not more than 6, or the number of desired steel strands is more than 6, but anchoring of both ends can be treated, an external prestress method is used; and when the number of the desired steel strands is greater, and anchoring of ends of the steel strands cannot be treated, an internal prestress method is used. The method is simple in construction, uninstall and additional arrangement of a temporary support are not needed, construction period is short, cost is low, an upper structure is not affected, and the method has the advantages that service life is synchronous with that of an original structure.

Disclosed is a construction method of a cellar for a building completed. The construction method includes fixing supporting structures to bottom concrete of the building; installing a press-in machine on the supporting structures; inserting posts for supporting the building into the foundation under the building by inserting hollow piles into the holes to then insert the piles into the underground using the press-in machine, stacking new piles on the inserted piles, and sequentially inserting the piles using the press-in machine; excavating a foundation under the bottom concrete of the building to prepare an underground space when the building is supported by the posts; and placing the concrete on the horizontal and vertical faces of the underground space prepared by the excavating the bottom concrete of the building.

The invention relates to a water-based organic silicon waterproof agent by taking sodium methylsilanolate as a main raw material, and is particularly suitable for moving penetration waterproof processing of a porous structure, such as bricks, stone materials, concrete, mortar, cement slurry and the like.

A gas drainage method for initial mining in a high-pumping working face under the back-drilling hole, the purpose of which is safe and convenient construction, improving the drainage rate, and effectively reducing the gas concentration of the working face; At a horizontal distance of 0 to 50 meters, excavate 2 to 3 drilling sites suitable for drilling rig construction, and drill 2 to 3 drilling holes in each drilling site; use drilling rigs to drill to the working face to replace the lower return of the back high pumping roadway Drilling, the drilling is drilled down from the high pumping roadway to the pressure relief zone just developed at the initial mining stage above the working face. ° within the angle line and within the rock stratum 4 to 5 times the mining height from the roof of the working face; during the initial mining of the working face, the high-level pumping roadway will be enclosed in the wall, and the iron pipe will be pressed to connect with the main pumping system to provide With high negative pressure, the gas that rises to the fracture zone is pumped to the high-level pumping lane through the down-return drilling, and then enters the drainage system to reach the ground.

The invention discloses a compression reinforcement skeleton structure which comprises a top steel plate and a bottom steel plate, wherein steel columns are vertically connected with the parts, close to the two ends, of the top steel plate and the bottom steel plate; the steel columns are integrally connected with the top steel plate and the bottom steel plate respectively; the tops of the steel columns penetrate through the upper surface of the top steel plate and extend to the outer side of the upper surface of the top steel plate; angle beads are arranged at parts, close to the two ends, in the top steel plate and are in right triangle structures; the two angle beads are arranged symmetrically; a steel protection plate is connected between the two angle beads; the two ends of the steel protection plate penetrate through the two angle beads respectively and are welded with the top steel plate; and the top steel plate and the bottom steel plate is provided with a reinforcement cage located between the two steel columns. The compression reinforcement skeleton structure is safe and simple in construct; the structural strength is ensured; the skeleton structure has low possibility of falling by utilizing a welding manner, has good compression resistance, and has low possibility of bending caused by excessive pressure; the compression strength of the skeleton structure is greatly improved; and the overall strength of the structure is further improved.