Abstract

An anti-cracking method and anti-cracking structure for pouring a ship lock floor in a strong constraint area of a bedrock. The method comprises: pouring a self-leveling mortar layer (1) on a hard bedrock; arranging thin and dense temperature rebars (5) on a lateral surface layer and an upper surface layer of a concrete layer (2), the horizontal temperature rebars (5) distributed on an outer layer being placed on the outermost side, so as to improve the horizontal tensile capacity of concrete in a length direction; in the pouring process of the concrete layer (2), arranging cooling water pipes (3) in the concrete layer (2); and after pouring is completed, covering the concrete layer with a heat preservation material and conducting water curing, such that it is guaranteed that the inner-surface temperature difference does not exceed 25° and the average cooling rate of a section does not exceed 2°C/d. The temperature crack resistance of the ship lock floor is effectively improved, and the risk of layer cracks and penetrating cracks of concrete of the ship lock floor is reduced.

IPC Classes  ?

• E02C 1/00 - Locks; Shaft locks, i.e. locks of which one front side is formed by a solid wall with an opening in the lower part through which the ships pass
• E02D 15/02 - Handling of bulk concrete specially for foundation purposes

Abstract

The present invention relates to a data collaboration driving-based determination method for insulation curing of a cast-in-place concrete structure, comprising the following steps: establishing a relationship model between concrete compressive strength and equivalent age of the concrete structure; performing a model test at the lowest environment temperature in a construction area, and determining parameter information of the concrete structure under different curing measures; establishing a concrete structure temperature field simulation model according to the lowest environment temperature and the parameter information, and determining temperature fields inside the concrete structure under different curing measures; on the basis of each temperature field, determining equivalent age of the concrete structure at a plurality of curing ages according to the temperature field, and substituting the equivalent age into the relationship model to obtain corresponding concrete compressive strength of the concrete structure at the plurality of different curing ages under each curing measure; determining whether the concrete compressive strength of the concrete structure at a preset curing age satisfies design strength, and if yes, recording the curing measure as a target curing measure; and selecting a cost-optimal target curing measure.

IPC Classes  ?

• E04G 21/24 - Safety or protective measures preventing damage to building parts or finishing work during construction
• E04G 21/28 - Safety or protective measures preventing damage to building parts or finishing work during construction against unfavourable weather influence

Abstract

A method for improving the durability of a cast-in-place concrete structure in a tidal range zone of a marine environment. Different types of concrete are used for an outer layer and an inner layer of a cast-in-place concrete structure, wherein the outer layer is made of corrosion-resistant concrete, and the inner layer is made of high-performance concrete; moreover, simultaneous pouring and curing construction are carried out for the different types of concrete of the inner and outer layers of the structure. By using the corrosion-resistant concrete prepared from a cementing material such as sulphate cement, an erosion-resistant admixture, and metakaolin, the concrete has excellent characteristics of high early strength, good anti-scouring performance, a low water absorption rate, and good chloride ion penetration resistance, etc. such that the durability of the cast-in-place concrete structure in the marine environment can be effectively improved, and a structural durability problem caused by early erosion by seawater is avoided.

IPC Classes  ?

• E02B 17/00 - Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs; Construction methods therefor
• E02D 15/02 - Handling of bulk concrete specially for foundation purposes
• C04B 28/04 - Portland cements
• C04B 111/20 - Resistance against chemical, physical or biological attack

Abstract

An offshore mooring and positioning method for a large-diameter HDPE pipeline, which method can complete the offshore mooring and positioning of a pipe segment (100) by using general simple devices such as a positioning steel pipe pile (200), a fixed-length rope (300), a wind-proof rope (400) and a barge (500), achieves rope mooring by pushing the pipe segment (100), is suitable for a positioning operation of a large-diameter high-density polyethylene pipeline before water filling and sinking, is suitable for various water depths, has low requirements for ships and devices, requires fewer operators, and can be used in the fields of port engineering, traffic engineering, water conservancy engineering and highway engineering.

IPC Classes  ?

• F16L 1/235 - Apparatus for controlling the pipe during laying

Abstract

Provided is an underwater positioning method for a large-diameter ultra-long HDPE pipe, which can complete accurate underwater pipe positioning by using general simple devices, such as several positioning cables (200), windproof cables (300) and other wire ropes, a fixing structure (400), and a barge (500). The method is suitable for accurate underwater positioning operations prior to underwater docking of large-diameter ultra-long HDPE pipes, has a broad range of applicable water depths, has low requirements for ship equipment and has a high operation safety factor.

IPC Classes  ?

• F16L 1/16 - Laying or reclaiming pipes on or under water on the bottom
• E02D 29/07 - Tunnels or shuttering therefor preconstructed as a whole or continuously made, and moved into place on the water-bed, e.g. into a preformed trench

Abstract

An offshore large-diameter high-density polyethylene (HDPE) pipeline weld junction loosening handling method, comprising the following steps: S1, preparing a transportation track, a winch, an excavator, a transportation trolley, a crane ship, a barge, and a centrifugal pump; S2, using air bags to float a pipe section that is fell off, moving the pipe section to a predetermined position and making the pipe section to submerge to the bottom; S3, determining the position of a ballast block, and sealing an weld junction on the end of the pipe section that is fell off; S4, exhausting air and pumping water to cause the pipe section to float upwards again; S5, after the pipe section floats, pulling the pipe section to the water contact end of the transportation track on the land and fixing the pipe section; S6, pulling the pipe section ashore to a preset position and locking the pipe section; and S7, repairing the pipe section and preparing for transportation. The method above achieves the recovery and repair of the pipe section of the large-diameter HDPE pipeline that sinks to the bottom caused by weld junction loosening during a floating process at sea, thus avoiding large economic losses, and is applicable to a wide range of water depth, has low requirements for ship machinery devices, and requires few operators.

IPC Classes  ?

• F16L 1/16 - Laying or reclaiming pipes on or under water on the bottom
• F16L 1/20 - Accessories therefor, e.g. floats or weights
• F16L 1/24 - Floats; Weights
• F16L 1/26 - Repairing or joining pipes on or under water

Abstract

An underwater closure method for a large-diameter HDPE pipeline, comprising: increasing the length of a closure pipe section (100) by utilizing the flexibility of the pipeline; reversely pulling multi-section arcs from a sea-side mounted pipe section (300), and enabling a pipe opening of a butt joint end to be retracted; and converting a straight line into an arc to eliminate an axial error; and performing underwater mounting of the closure pipe section in a plugging mode. The required production cost is small, the operability is high, and the method is suitable for various water depths.

IPC Classes  ?

• F16L 1/26 - Repairing or joining pipes on or under water

Abstract

An underwater repairing method for a large-diameter HDPE pipeline. The method comprises: using a semicircular clamp hoop (300) cooperated with concrete encapsulation to fix a rubber plate (700) to a pipeline to be repaired (200); winding the pipeline by using a rubber cloth; installing a reinforcement cage (400) and a formwork (500); pouring concrete to stop water. In this way, no extra pipeline needs to be mounted, the operation difficulty is small, the repairing performance is high, and economic performance is good.

IPC Classes  ?

• F16L 1/26 - Repairing or joining pipes on or under water

Abstract

A method for setting a water inflow section of an onshore transportation track for a large-diameter ultra-long HDPE pipe, comprising the following steps: determining the total length of a transportation track (100), the length of the track of a water inflow section (130) being 1/12 of the total length of the transportation track (100); determining a load on a pipe (200) according to the weight of the pipe and the weight of fittings, a buoyant force of a water inflow end of the pipe (200), and a traction force of a front end of the pipe (200); determining a dry boundary condition and a wet boundary condition; establishing a model to calculate and analyze the force of the pipe when entering the water; and determining the slope of the transportation track of the water inflow section according to different slope ratio combinations. According to the method, safe and efficient transportation of a pipe is ensured, the engineering amount of a transportation system is also reduced, and thus time and economic costs are saved.

IPC Classes  ?

• B65G 67/60 - Loading or unloading ships