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 invention relates to the field of tunnel excavation. The invention relates to a tunnel expanding excavation method. The method comprises IV-level and V-level surrounding rock tunnel construction methods and further includes an III-level surrounding rock tunnel construction method. The IV-level surrounding rock tunnel and the V-level surrounding rock tunnel construction methods comprise the following construction steps that an excavated tunnel is partitioned, and the excavation tunnel comprises a first part in the middle of an arch crown, a second part on the left side of the first part, athird part on the right side of the first part, a fourth part on the lower side of the second part, a V part on the lower portion of the third part and a VI part on the first part. According to the construction methods, double-side-wall partial excavation is adopted, and the excavation mode of first arching and then wall excavation has the advantages that the arch crown sinking is minimum, the horizontal displacement is small, the temporary supporting axial force is minimum, supporting is reliable, and the project progress is fast. And the scheme is very suitable for expanding excavation construction of tunnels with ultra-large spans, ultra-large sections and small intervals, the construction safety is high, and the phenomena of collapse and the like are avoided.

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 discloses a retaining-wall reinforcement cage for traversing underground pipelines and a construction method thereof. The retaining-wall reinforcement cage comprises a reinforcement cageframework, primary suspension point groups and secondary suspension point groups, wherein the secondary suspension point groups are arranged on two sides of one end of the reinforcement cage framework; and the primary suspension point groups are arranged at an end of the reinforcement cage framework between the secondary suspension point groups. The construction method comprises the steps of slotting, suspending movement by use of the primary suspension point groups, suspending movement by use of the secondary suspension point groups and final accomplishment of construction. Owing to variations of positions of suspension points and transverse swinging movement in a slot, the retaining-wall reinforcement cage is prevented from stretching across the underground pipelines. The problem that aretaining wall is difficult to construct in a pipeline dense area can be effectively solved. The retaining-wall reinforcement cage has the advantages that an occupied area is small, a site is easy toarrange, the progress of works is high, interference factors are less and exiting facilities around are guaranteed to be in a perfect condition.

The invention provides a flexible surface layer fabricated soil nail wall structure for a foundation pit slope and a construction method of the flexible surface layer fabricated soil nail wall structure. Soil nails, flexible surface layers, prefabricated connecting pieces, horizontal beams and inclined beams are included; the flexible surface layers are laid on the side slope; the prefabricated connecting pieces comprise pressing plates and convex blocks; the pressing plates comprise horizontal edges and vertical edges; the convex blocks are arranged at the cross points of the pressing plates,and the vertical sections of the convex blocks are square or rectangular; the prefabricated connecting pieces are arranged in a matrix mode; the convex blocks are vertically pressed on the flexible surface layers; at least one positioning installation hole passage is arranged on the middle part of each prefabricated connecting piece, the horizontal beams are correspondingly arranged between the adjacent prefabricated connecting pieces in the horizontal direction, two ends of the horizontal edges of the pressing plates are pressed on the horizontal beams on both sides; the inclined beams are correspondingly arranged between the adjacent prefabricated connecting pieces in the inclined direction, two ends of the vertical edges of the pressing plates are pressed on the inclined beams on two sides, and the soil nails are correspondingly arranged in the positioning installation hole passages of the prefabricated connecting pieces in a penetrating mode. The technical problems of unclear force mechanism, weak force at joints, waste of building materials, poor environmental protection and low construction efficiency of a traditional soil nail wall structure are solved.

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 present invention discloses a construction method for a locating bracket of a tunnel anchorage prestressed system, comprising the following steps: manufacturing locating bracket racks outside a tunnel, assembling the racks into segmented locating bracket steel trusses, and installing rolling wheels at the bottoms of the trusses, and temporarily fixing prestressed pipes on the trusses; laying a slip track at the bottom of the interior of the tunnel, putting the steel trusses onto the slip track through hoisting in a segmented manner, and slowly lowering the steel truss by a winch; when the steel truss slides to the design positions, removing the rolling wheels from the steel truss for sliding of the next segment of section truss; and adjusting and fixing the positions of the steel trusses and the prestressed pipes. Through the method, the prestressed locating bracket is subjected to assembly construction, the process is simple and the project progress is fast, accordingly the construction period is greatly shortened, construction costs are reduced, and the economic efficiency is very obvious.

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 discloses a method for processing super-large-diameter round hole without supports, which comprises following steps: building underground continuous wall; setting filling posts and supports; setting strengthen element; excavating and setting purlin. Compared to traditional method, the invention has strong stability, less excavating deformation, less rebound of hole-bottom, and less effect on around environment. The invention has no inner support structure; therefore, it has less cost with simple operation, quick time and high working efficiency.

The invention belongs to the technical field of textile workshop humidification, and particularly relates to an efficient energy-saving wet curtain humidifying and cooling system for a textile workshop and a control method of the efficient energy-saving wet curtain humidifying and cooling system. The efficient energy-saving wet curtain humidifying and cooling system comprises a wet curtain, a water tank, a circulating water pump, a water supply pipe and a water return pipe, wherein the wet curtain is mounted in an air duct; an indoor air adjusting window communicating with the workshop is arranged on the air duct; the water supply pipe and the water return pipe are arranged between the wet curtain and the water tank; the circulating water pump is arranged on the water supply pipe; circulating water is supplied into the wet curtain through the circulating water pump; the wet curtain is connected with a main air pipe; a fan is arranged in the main air pipe; the main air pipe is connectedwith an air pipe; a plurality of air holes are uniformly distributed in the air pipe; and the air pipe is distributed in the workshop. The efficient energy-saving wet curtain humidifying and coolingsystem has the advantages of low cost, low energy consumption, good humidifying effect and the like, and can save energy by 50% or above.

The invention discloses a pre-consolidation construction method for a completely weathered stratum. The pre-consolidation construction method is characterized in that cement grout materials are filled in gaps among particles of the completely weathered stratum, an intensely weathered stratum or a covering layer under certain pressure, and after solidification of the cement grout materials, consolidated bodies are formed by mixing the particles with grout. The pre-consolidation construction method particularly includes steps of trimming slopes so that the ratio of the slopes ranges from 1:1 to 1:1.3; measuring and setting out hole positions; performing drilling with casing in a non-irrigation section and embedding orifice pipes in the non-irrigation section; forming a hole in a first section by means of drilling with casing; mounting a grouting shock pipe; pulling up the orifice pipe; grouting; waiting for solidification of the cement grout materials, and cleaning the drilled hole; and performing acceptance check. The pre-consolidation construction method is high in pertinence and reliable in technology, construction procedures are simple, operation is simple and convenient, cost is low, and steel materials are saved as compared with other supporting measures such as steel tubular piles. Besides, as compared with the other supporting measures, a ground for implementing the pre-consolidation construction method is easy to arrange, project progress is fast, and the pre-consolidation construction method is favorable for providing operation conditions for follow-up working procedures in time.

The invention discloses an urban overpass industrial short-line prefabricating and splicing construction method. The method includes the first step of calculating the deflection aggregate value in each construction stage by considering the structure dead load of an overpass, the construction live load of the over pass and the load, based on the concrete shrinkage, creep, prestressed tendon relaxation and wind load influences, of the overpass, and dividing a whole box girder into multiple sections with the deflection aggregate value in the construction complete stage as the camber during cast-in-place beam construction; the sixth step of symmetrically splicing the box girder bodies in pairs in a suspended mode after the box girder bodies poured block by block are set finally and stacked and stored for a certain time period, and finally forming a multi-span continuous girder bridge. By means of the urban overpass industrial short-line prefabricating and splicing construction method, social resources are reasonably utilized, the input amount of steel and mechanical devices for the support system is lowered, construction cost is reduced, the land requisition and demolishing area is reduced, and the construction cycle is shortened.

The invention discloses a reinforcing agent for permeable concrete and its preparation method and construction process, wherein the reinforcing agent comprises the following components in parts by weight: 50-80 parts of nano-scale silicon powder, 10-15 parts of water reducer, 2~4 parts of cellulose, 8~10 parts of calcium sulfate whiskers, 5~8 parts of trisodium phosphate, 1.5~5 parts of calcium carboxylate, 2~6 parts of alkali metal carbonate and 0.5~2 parts of formamide. The reinforcing agent can improve the bonding effect of cement, improve the compressive strength and service life of the permeable concrete pavement at the same time, and can also simplify the construction process, the process flow is short and the project progress is fast, and has significant economic and social benefits.

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.

The invention relates to a water filtration wall for an upstream type tailing pond. According to the technical scheme, the water filtration wall is formed by a first water filtration wall body (12), a second water filtration wall body (13) and a third water filtration wall body (14) in an enclosed mode. The first water filtration wall body (12) and the second water filtration wall body (13) extend outwards from the two sides of a mountain slope (1) correspondingly and are correspondingly connected with the two ends of the third water filtration wall body (14). The main bodies of the water filtration wall bodies have the same cross-section shape which is a constant-section isosceles trapezoid. According to each isosceles trapezoid, a concrete interlayer (10) is arranged in the middle and located at the perpendicular bisector of the top edge of the isosceles trapezoid, 4-16 layers of water collecting plates (4) are symmetrically arranged on the two sides of the concrete interlayer (10), and a row of water filtration pipes (9) is arranged above each layer of water collecting plates (4). Each concrete interlayer (10) is uniformly provided with water collecting wells (16), gravel (5) is symmetrically laid on the two sides of each concrete interlayer (10), and geotechnical cloth (11) is laid on the inclined surface of the gravel (5). The water filtration wall for the upstream type tailing pond has the advantages that the seepage drainage and stopping effects are good, cost is low, a dam body is safe and steady and construction is easy and convenient.

The invention discloses a construction method for a large-dip-angle tunnel type anchorage secondary lining support. The construction method comprises the steps that (1) a plurality of secondary lining support piece units are manufactured, and each secondary lining support piece unit is of an arch structure; (2) secondary lining side walls are poured, a plurality of brackets are embedded in the secondary lining side wall on each side, and the brackets are located on the same straight line; a jack is arranged on each bracket, and multiple jacks jointly support a longitudinal adjusting beam arranged in the linear direction; (3) the secondary lining support is installed, specifically, a plurality of secondary lining support piece units are installed in sequence, the two ends of each secondary lining support piece unit are connected with longitudinal adjusting beams on the secondary lining side walls on the two sides of the tunnel respectively, and the secondary lining support piece units are arranged at intervals; and after the secondary lining support piece units on each construction section are installed, the elevations of the secondary lining support piece units are adjusted by adjusting the jacks, and installation of the secondary lining support is completed. According to the construction method, the construction quality is guaranteed, the construction efficiency is improved, and the construction cost is saved.