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406results about How to "Fast construction" patented technology

Collapse and sink intrusion limit construction method for treating wind accumulated sand loess tunnel through stride shed pipe

The invention relates to a loess tunnel construction method, in particular to a collapse and sink intrusion limit construction method for treating a wind accumulated sand loess tunnel through a stride shed pipe. The problems of relatively larger construction space, high cost, long period, poor safety and the like of the current stride shed are solved by the method. The method comprises the following steps of: 1) treating ground surface cracks; 2) filling holes; 3) determining an arch replacing range; and 4) performing an excavating method by using a three-step method, setting a radial anchoring rod before the arch is replaced, and detaching a steel arc frame one roof truss by one roof truss after grouting and reinforcing. The excavating method comprises the following steps of: a, detaching a sink intrusion limit section primary support one roof truss by one roof truss by using an excavating machine vibrating hammer and a manual pneumatic pick, and after detachment, timely performing primary spraying to seal a surrounding rock; b, performing forepoling by using a dual-layer stride anchoring rod to form a stride shed pipe structure; c, spanning the steel arc frame, and tamping the stride foot-locking anchoring rod by using upper, middle and lower arc guide feet; and d, after detachment one roof truss by one roof truss according to the steps, timely supporting. The method has the advantages of high construction speed, small required space, simple and convenient operation, low mechanical investment, guarantee in construction quality and safety and wide application range.
Owner:THE 2ND ENG OF THE 12TH BUREAU GROUP OF CHINA RAILWAY

Construction method for adding water lowering well in water collecting well

The invention discloses a construction method for adding a water lowering well in a water collecting well, which comprises the following steps of: driving a prepared round steel pipe water lowering well structure into a bottom wall of the water collecting well until the scale height required is met; removing the earth in the round steel pipe; refilling gravels on the bottom of the round steel pipe to form a water filtering layer; placing a water pump in the round steel pipe for pumping water according to water level situation; paving in sequence a cushion layer, a waterproof layer and a waterproof protection layer on a side wall and a bottom wall of the water collecting well for construction recovery; binding steel bars on the side wall and the bottom wall of the water collecting well out of the waterproof protection layer, and pouring concretes on the bottom wall and the side wall of the water collecting well; and blocking the top of the round steel pipe. By means of the construction method provided by the invention, the water lowering well has the advantages of simple and convenient construction method, fast construction speed, low cost and high intensity, is capable of effectively solving the problem that the water cannot be timely discharged to the specified depth below a bottom plate on the condition that a water stop curtain is slightly cracked to leak the water to damage the waterproof layer of the water collecting well nearby and satisfying the basement construction requirements, and is simple in structure.
Owner:天津住宅集团建设工程总承包有限公司

Construction method of cast-in-situ oblique arc-suspended concrete shear wall

The invention discloses a construction method of a cast-in-situ oblique arc-suspended concrete shear wall, which comprises the following steps of: (1) dividing the projection of the outer side lines of an inner arc template and an outer arc template of a basement of the oblique arc-suspended concrete shear wall and the projection of the outer side lines of an inner arc template and an outer arc template of a wall crown of the oblique arc-suspended concrete shear wall into equal parts; (2) determining the erection position of a total station and the coordinates thereof to obtain the distance between the total station and each equal part point of the projection of the outer side lines of the inner arc template and the outer arc template of the basement and the outer side lines of the inner arc template and the outer arc template of the wall crown; (3) erecting the total station and rotating the total station at an a1 angle by taking the starting point of the axis of the basement as a backsight point; (4) determining the positions of the projection of the outer side lines of the inner arc template and the outer arc template of the basement of the shear wall and the outer side lines of the inner arc template and the outer arc template of the wall crown of the shear wall; (5) installing the templates; (6) fixing the templates; and (7) after installing a die carrier and inspecting to be qualified, pouring concrete. The construction method is simple and easy and has high work efficiency, accurate measurement and positioning and low cost.
Owner:WUHAN CONSTR ENG

Sling tensioning and system conversion method for double-tower three-span plane main cable self-anchorage type suspension bridge

The invention discloses a sling tensioning and system conversion method for a double-tower three-span plane main cable self-anchorage type suspension bridge. The sling tensioning and system conversion method comprises a first step of synchronously tensioning and anchoring a plurality of slings horizontal at an identical vertical bridge direction position; a second step of enabling sling tensioning within a full bridge to be performed at four operation positions simultaneously at most, enabling two side spans to be two operation positions respectively, and enabling two half spans of a main span to be two operation positions respectively; a third step of symmetrically tensioning slings of two half-bridges with a main span midspan serving as a limit; a fourth step of tensioning and anchoring side span slings from a side span midspan to two sides one by one within the range of each half-bridge, synchronously tensioning every two adjacent slings in remaining slings which are not tensioned or anchored from a main tower to the midspan, tensioning and anchoring slings close to the main tower, enabling another sling to be tensioned to some cable force and be temporarily anchored, and circulating until all slings are tensioned and anchored. According to the sling tensioning and system conversion method, a construction speed is quick, a construction period is greatly shortened, needed jacks and extension bars are fewer, and the cost is greatly reduced.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Shield receiving forward-shift construction method of boulder group open excavation and embedment mutation space

ActiveCN103032071AEliminate the risk of construction downtimeFast constructionExcavationsTunnelsShield machineEmbedment
The invention relates to the technical field of tunnel shield construction and particularly provides a shield receiving forward-shift construction method of a boulder group open excavation and embedment mutation space. The problem that a shield cannot be normally received and hoisted out by shifting forward to a station by using the traditional method in conventional construction can be solved. The shield receiving forward-shift construction method comprises the following steps of: digging a boulder group open excavation and embedment section; forming a transition curve by a refilled receiving well as a large-slope curve with the open excavation and embedment section, and receiving and shifting forward the shield with the large-slope curve; and shifting forward the entire shield in the open excavation and embedment section, paving a back-up transition rail bar and a transition guide rail on the large-slope curve, shifting forward the entire shield by using a movable counter-force device and an oil cylinder of a shield machine, and shifting forward and respectively paving a forward-shift guide rail and a back-up forward-shift guide rail of a shield body on the open excavation and embedment section simultaneously. With the adoption of the shield receiving forward-shift construction method provided by the invention, the section tunneling mission is smoothly completed by the shield; a curve shield receiving process is started; and a technology of forward shifting the entire machine when the shield is backed up without the rail bar is innovated. The shield receiving forward-shift construction method has the advantages of simple process, low construction cost, flexible construction method and the like.
Owner:CHINA RAILWAY 12TH BUREAU GRP +1

Combined steel pile cofferdam provided with water swellable waterproof rubber fore shaft

The invention discloses a combined steel pile cofferdam provided with a water swellable waterproof rubber fore shaft, which comprises cofferdam pegs and cofferdam long piles used for connecting two adjacent cofferdam pegs. Each cofferdam peg comprises a U-shaped steel sheet pile and a fore shaft sub-part, and the left and right ends of each U-shaped steel sheet pile are respectively and fixedly connected with one fore shaft sub-part. Each cofferdam long pile comprises a steel pipe pile, a fore shaft parent part arranged at the outer side of the steel pipe pile, and a water swellable rubber liner arranged in the fore shaft parent part; a tubular inner cylinder matched with each fore shaft sub-part and a notch connecting the interior of each tubular inner cylinder with the exterior of each tubular inner cylinder are arranged on the fore shaft parent part; each water swellable rubber liner is fixedly arranged on the inner wall of the corresponding tubular inner cylinder; each fore shaft sub-part is sleeved into the corresponding tubular inner cylinder; and bentonite compound filler is filled in a gap between each fore shaft sub-part and each water swellable rubber liner. By taking the combination of a rigid steel pile and a flexible steel pile to have complementary advantages, the combined steel pile cofferdam has good water resistance; the fore shaft is reliable in connection; the material of the combined steel pile cofferdam is easy to obtain; and the combined steel pile cofferdam is strong in integral structural rigidity and low in cost and is quick to construct.
Owner:SOUTHEAST UNIV

Construction method for vibrating sunken tube construction secant pile wall

The invention discloses a construction method for a vibrating sunken tube construction secant pile wall, and belongs to the technical field of construction. The construction method comprises the construction steps: construction preparation, pile position measuring and unreeling, construction of a guide wall, vibrating and sinking casing pipes in position by using a vibrating sunken tube pile machine, construction of a first plain concrete pile, earth taking through an in-position rotary drilling rig, concrete pouring and casing pipe removing, construction of a second plain concrete pile, construction of a third plain concrete pile, construction of a first steel reinforcement cage concrete pile, construction of a second steel reinforcement cage concrete pile and the like. The steps are repeated in sequence until the completion of the secant pile walls. The construction method is fast in construction speed, the construction time of a single pile is about six hours, construction efficiency is improved, the casing pipes are pressed down and pulled off by using a vibration mode, a vibration function is performed on concrete poured underwater, the situation that the steel reinforcement cage floats upward is effectively controlled, the concrete is denser and solider, the quality of a pile body is higher, and the method is suitable for bracing engineering of foundation pits in suburbs, and is particularly suitable for the construction of the secant pile wall of the soil layer of silt, clay and sludge.
Owner:浙江省地矿建设有限公司

Reducing swing-injected agitating pile

The invention relates to a reducing swing-injected agitating pile. Stirred cement paste is pressed into a cement paste tube through a slurry pump. The cement paste enters a faucet through a cement paste pipe connector, then enters a grouting steel tube and is sprayed out through a high-pressure slurry sprayer, and a soil body is cut at high pressure. While the soil body is cut through high-pressure cement paste, reducing stirring blades arranged on an outer drill pipe and an inner drill pipe can synchronously achieve stirring of the soil body. While the soil body is cut through a high-pressure grouting mode and the stirring blades of the inner and outer drill pipes rotate to stir the soil body, under the action of a lifting system, the whole high-pressure grouting and stirring system carries out grouting, stirring and sinking at the same time or stirring and uplifting at the same time according to design requirements. By means of a series of motions, the cement cylindrical agitating pile with a certain diameter can be obtained. On the basis that the advantages that a construction machine is simple and speed is high in a deep layer stirring method are inherited, the comprehensive advantages that a high-pressure swing-injection method is large in guniting pressure, wide in applicable stratum range and large in three-axis agitating pile power are combined, and the agitating pile has the characteristic of being wide in application range.
Owner:南京路鼎搅拌桩特种技术有限公司 +1

Method and structure for excavating soil in core tube region based on raft pile supporting

InactiveCN102116028AFast constructionReduce earthwork excavation areaExcavationsEarth anchorRapid construction
The invention discloses a method and structure for excavating soil in the core tube region based on raft pile supporting. The method comprises the following steps: vertically driving first layer of raft piles one by one on the edge of a foundation pit according to the length and width requirements of the foundation pit and fixing a circle of horizontal timber piles with gate type forcers at one side of the foundation pit of the first layer of raft piles; vertically driving steel ground anchors on the ground outside the first layer of raft piles; tensioning the steel ground anchors and the horizontal timber piles with tie bars; excavating a foundation pit at the inner sides of the first layer of raft piles; vertically driving second layer of raft piles on the edge of the bottom of the foundation pit; fixing a circle of horizontal timber piles with gate type forcers at one side of the foundation pit of the second layer of raft piles; connecting the first layer of raft piles with the second layer of raft piles with tie piles via the gate type forcers; continuously excavating a foundation pit at the inner sides of the second layer of raft piles; driving third layer of raft piles at the bottom of the foundation pit; connecting the second layer of raft piles with the third layer of raft piles with timber piles via the forcers; and doing the rest in the same manner until the foundation pit is excavated to the design depth. The method and the structure have the characteristics of simple and rapid construction and economy.
Owner:THE THIRD CONSTR & ENG OF CCFED

Prestressed steel cylinder concrete push pipe

The invention relates to a prestressed steel cylinder concrete push pipe. The prestressed steel cylinder concrete push pipe according to the technical scheme provided by the invention comprises a concrete pipe core and outer-ring reinforced concrete positioned outside the concrete pipe core and is characterized in that: the concrete pipe core is formed by pouring concrete in a cavity formed by cylindrical inner and outer steel mold plates, a bottom mold and a top mold; a cylinder steel cylinder is fixed in the cavity before pouring, a socket steel ring is arranged at the socket end of the concrete pipe core, and a jack steel ring is arranged at the jack end of the concrete pipe core, wherein the socket steel ring which corresponds to one end of the socket end is connected to the cylindrical steel cylinder, and the jack steel ring which is connected to one end of the jack end is connected to the cylinder steel cylinder. The prestressed steel cylinder concrete push pipe provided by the invention can bear larger pushing force during pushing construction, is provided with a grouting channel for grouting and drag reduction during construction, can bear larger internal water pressure and external load, strong anti-permeability of a pipe body, better leakproof property because two seal rings are used for sealing a joint, longer service life and lower construction cost compared with simular construction methods.
Owner:无锡华毅管道有限公司
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