39results about How to "The progress of the project is fast" patented technology

The invention discloses a single-wall and double-wall combined steel cofferdam construction method and a single-wall and double-wall combined steel cofferdam. The single-wall and double-wall combined steel cofferdam construction method includes the following steps: firstly, assembling the bottom segment side plate of the cofferdam at an assembly field; then floating to the position of a pier; after that, injecting concrete into the foot blade and assembling the top segment of cofferdam and the top segment inclined strut; then positioning, cleaning up the pedestal, building a boring platform, installing a steel casing and stacking the sandbags sequentially; after that, injecting bottom seal concrete, and boring the pier for injection; finally, after the pier pedestal is constructed, pumping the water, cutting off the steel casing, chiseling off the laitance at the head of the pier and beginning the construction of a bearing board. The bottom segment side plate of the cofferdam is composed of circular external and internal wall panels, and the top segment side plate of the cofferdam is fixed on the circular external wall panel. The invention has the advantages of fast engineering speed, small construction difficulty and small cost investment, and the top segment side plate can be used repeatedly and is high in recovery rate; the invention overcomes the difficulties at the time of no bottoming concrete thickness; the circular sealing concrete between the bearing board and the cofferdam also has the effect of resisting water.

The invention discloses a prestressed anti-floating anchor rod and a construction method thereof. The invention is characterized in that alignment steel tubes are arranged in an anchor rod body which is formed by a plurality of steel bars uniformly distributed along the circle, the steel bars are provided with a plurality of barbs, the alignment steel tubes are arranged at intervals along the axis of the anchor rod body and are fixedly connected with the steel bars, the barbs are welded with the steel bars. The construction method comprises the following steps: grouting into piles; arranging the anchor rod; locking the anchor rod; and sealing the anchor. Compared with the prior art, the invention has the advantages of simple structure, convenient construction, good anti-floating effect and low cost, especially being applicable to the reconstruction of old buildings with built underground structures and confined water.

The invention relates to a maintenance method for shield equipment and discloses a method for replacing a tail brush in a shield tunnel through liquid nitrogen freezing. The method comprises the following processing steps: 1, preparation of construction; 2, construction of freezing holes; 3, installation of a freezing system and a temperature measuring system; 4, construction of liquid nitrogen freezing; 5, construction of sealing maintenance of a shield tail; 6, construction of formation sealing of the freezing holes; 7, construction of forced thawing; and 8, construction of propulsion of shield recovery. According to the invention, stratum is frozen through a liquid nitrogen freezing method to form a frozen curtain, so that the defect of indeterminacy of a traditional grouting method for carrying out the treatment of stratum consolidation and water sealing to bearing pressure permeable stratum can be avoided; and the method has the advantages of high strength, good uniformity, good water-resisting property and the like.

The invention relates to the technical field of subway construction, in particular to a method for constructing subway tunnel with complicated geology and without shield launching site, which solves the problems of complicated geology in the subway section and failure to provide shield launching site on time in the exiting subway construction process. The method comprises the following steps of arranging a shield inclined shaft in a preset tunnel section; respectively constructing a shield empty-push hidden excavation section and a synchronous-construction hidden excavation section at both ends of the shield inclined shaft by a mine method, and timely applying primary support; connecting the shield empty-push hidden excavation section to a shield tunneling section; enabling a shield body and subsequent auxiliary equipment which are lowered and assembled by the shield inclined shaft to respectively adopt the splitting launching type to arrive at the shield pushing section via the shieldempty-push hidden excavation section, and performing shield tunneling launching; excavating the synchronous-construction hidden excavation section to a subway station by the mine method. The subway tunnel construction method has the advantages that compared with single shield construction method, the advantages of various working methods are fully played; the abrasion of a tool disc is reduced, the condition of frequent bin opening for tool replacing is avoided, the safety risk is decreased, the construction progress is quick, and the like.

The invention discloses a recyclable prestressed tendon for soft oil support and a construction method thereof. The prestressed tendon comprises: an anchor plate, a steel strand, an anchor end lock and loaded plates, wherein the anchor plate is circular and one side of the plate is provided with a plurality of loaded plate and strand holes evenly along the periphery, and the circle center of the plate is provided with a grouting hole; the anchor end lock is tubular and fixedly arranged on the strand hole at one side of the anchor plate; the loaded plate takes the shape of a vane and is movably connected with the anchor by a hinge; two sides of the hinge are provided with a limit plate fixedly connected with the anchor plate; and the steel strand penetrates into the strand hole to be compressed and connected with the anchor end lock fixedly arranged on the anchor plate. The construction method includes the following steps: digging a base pit and forming pores; arranging the tendon; locking the tendon; and recovering the steel strand. The prestressed tendon and the method are simple in structure and convenient for construction and compared with the prior art, have the advantages of no support structure in the base pit, convenience for digging soil body, no problems that underground barriers appear and building construction crosses the building line, the recyclable tendon for support, fast progress of works and high work efficiency.

The present invention discloses a free-standing encasing structure of grid ground wall that consists of inner ground wall, middle ground wall, outer ground wall, punched steel plates and top plates. The section of the inner ground wall is of a serial T-shapes, the section of the outer ground wall is also a series of T shapes and is corresponding to the T-shaped sections of the inner ground wall. Between corresponding T sections is traverse I-shaped middle ground wall that is connected to corresponding T sections via punched steel plates. The top plates are positioned on the top of the inner, middle and outer ground wall. This invention has strong resistance to incline, slide and seepage, meets the needs of structural and environmental safety, and has the advantages of holistic stability, strong resistance to apophysis, little distortion on digging, slight effects on the environment and wide application range.

The invention provides a method for treating coastal saline soft ground by jetting industrial waste slag into two-way nail-shaped mixing piles. The method comprises the steps of: removing sundries on the surface of the site to be treated, and leveling the site; Identify each pile position and mark it; according to the pile position identification, move the two-way nail-shaped pile mixer into place and align the specified pile position; first spray and first stir the composite curing agent slurry; second spray and second stir waste tire rubber powder; The invention uses a variety of industrial waste residues to prepare a composite curing agent, which can not only treat the coastal salt-stained soft foundation formed by tidal flat reclamation on a large scale, but also solve the problems of land occupation and environmental pollution by various wastes, and achieve good economic and social benefits. And environmental benefits, has a relatively broad engineering application prospects.

The invention discloses a reinforcing agent for previous concrete as well as a preparation method and a construction process of the reinforcing agent. The reinforcing agent is prepared from the following components in parts by weight: 50 to 80 parts of nano-grade silicon powder, 10 to 15 parts of water reducing agent, 2 to 4 parts of cellulose, 8 to 10 parts of calcium sulfate whisker, 5 to 8 parts of trisodium phosphate, 1.5 to 5 parts of calcium carboxylate, 2 to 6 parts of alkali carbonate and 0.5 to 2 parts of formamide. According to the reinforcing agent, the bonding effect of cement canbe enhanced; meanwhile, the compressive strength and service life of a previous concrete pavement are respectively enhanced and prolonged, and the construction process is simplified; the process flowis short, the project progress is quick, and remarkable economic benefit and social benefit are realized.

The invention provides a karst stratum stabilization structure used for constructing a punch filling pile. The punch filling pile penetrates through at least one cave in a karst stratum from top to bottom; a hole-wall treatment structure comprises a casing, a pile hole of the punch filling pile, a hole-wall crack water neutralization layer of the pile hole and a mud protection layer, wherein the casing is embedded into the karst stratum at a pile position of the constructed punch filling pile before the punch construction of a top plate of the cave for a certain depth and is far away from the surface of the karst stratum for a certain height; the pile hole is concentric to the casing, and the diameter of the pile hole is smaller than that of the casing; the mud protection layer punctures a cave wall and a pile hole wall behind the top plate of the cave and is sealed, tight and waterproof. Due to the fact that a karst area is treated by using flagstones, clay, straws, cement and the like, the engineering progress is rapid, the engineering quality is reliable, the construction is safe, general resources can be better utilized, and a great number of concrete materials are saved.

The invention discloses a deeply-buried pool construction method for a gridded underground continuous-wall foundation pit support. The method includes construction of a gridded underground continuous wall and a deeply-buried pool structure, and is characterized in that a deeply-buried pool takes the gridded underground continuous wall as a lateral force resistant soil retaining structure, and vertical earth excavation of an inner-support free structure is performed in the foundation pit support formed by the gridded underground continuous wall. The construction method specially includes the steps of building of the underground continuous wall and construction of the main pool structure. Compared with the prior art, the deeply-buried pool construction method has the advantages that the construction process is simple, progress of the construction is fast, construction waste caused by subsequent dismantling of a temporary foundation pit structure is avoided, energy conservation and emission reduction are achieved, the process is green and environment friendly, and the method is especially suitable for construction of pool structures with soft layers deeply buried by less than 15 meters.

The invention relates to tunnel mountain unsymmetrical pressure section and underground excavation underground engineering construction, in particular to a sleeve valve pipe reinforcing construction method for a mountain. The technical problems that in existing tunnel construction, due to influence of rock mass crushing, structural face steep inclination, steep terrain and engineering activities, primary support cracking in a tunnel is caused, a local steel frame is distorted and deformed, and arc-shaped cracks are generated on the earth surface are solved. Rigid sleeve valve pipe grouting is conducted within a certain range on two sides of a tunnel section with cracks. Through high-pressure grouting, grout permeates into rock stratum cracks, the compactness and uniformity of a stratum are improved by repeatedly compacting the stratum, and the rigid sleeve valve pipe micro pile effect is combined, so that a rigid composite stratum is formed, and the stability of the stratum is effectively improved.