CN-121992806-A - Reinforced concrete cylinder prefabrication method

CN121992806ACN 121992806 ACN121992806 ACN 121992806ACN-121992806-A

Abstract

The invention provides a reinforced concrete cylinder prefabricating method, which belongs to the technical field of concrete member manufacturing and comprises the following steps of S1, prefabricating a reinforced concrete cylinder, S2, carrying out delivery of the concrete cylinder, S3, processing a steel structure cylinder and an auxiliary grid, S4, butt-jointing and assembling the steel cylinder and the concrete cylinder, S5, carrying out transportation of the combined structure cylinder and the auxiliary grid, S6, vibrating and sinking the cylinder, installing and sealing the auxiliary grid, S7, backfilling in a bin and constructing a cushion layer, and S8, dismantling the cylinder and the auxiliary grid. In practical use, the two parts, namely the cylinder and the secondary grid, have a very important and practical characteristic, namely that they can be removed integrally and recycled. Through the operation mode, the waste condition of resources can be effectively reduced. Under the large background that sustainable development and efficient resource utilization are emphasized at present, the design of the integral dismantling and recycling is particularly important, and the phenomenon of resource idling and waste caused by unreasonable recycling of components is avoided.

Inventors

LIU YANJIANG
WANG SHUQING
WANG QILI
ZHAO QINAN
TAO YANGYANG

Assignees

中交第一航务工程局有限公司
中交一航局第五工程有限公司

Dates

Publication Date: 20260508
Application Date: 20260408

Claims (10)

1. A method for prefabricating a reinforced concrete cylinder, comprising the steps of: S1, prefabricating a reinforced concrete cylinder; s2, delivering the concrete cylinder; S3, processing the steel structure cylinder and the auxiliary grid; s4, assembling the steel cylinder and the concrete cylinder in a butt joint way; S5, transporting the combined structure cylinder and the auxiliary grid; S6, vibrating and sinking the cylinder, and mounting and sealing the auxiliary grid; S7, backfilling in a bin and constructing a cushion layer; S8, detaching the cylinder and the auxiliary grid.
2. The method for prefabricating a reinforced concrete cylinder according to claim 1, wherein S1 is specifically: s1.1, building a scaffold on site, and binding and forming the steel bars; S1.2, connecting a bottom die and an inner side die plate with each other through screw rods, wherein the bottom die adopts an annular steel box girder, and the inner side die plate and the outer side die plate adopt steel plates, plate ribs, transverse connecting rods and truss structures; s1.3, intensively mixing concrete in a prefabricated field by using mixing equipment according to the determined construction mixing proportion; S1.4, transporting by adopting a concrete tank truck, feeding a pump truck into a mould, and vibrating by using a vibrator in layers.
3. The method for prefabricating a reinforced concrete cylinder according to claim 2, wherein S1.3 is: S1.3.1, conveying coarse aggregate into an aggregate weighing machine through an aggregate conveying belt, conveying powder into the powder weighing machine through a powder conveyor, conveying water into a water-reducing agent weighing hopper, and introducing a water-reducing agent into the water-reducing agent weighing hopper; s1.3.2, firstly conveying the weighed quantitative aggregate into a stirrer, then conveying the weighed powder into the stirrer, and conveying the mixed water and water reducer into the stirrer after delaying for a plurality of seconds; s1.3.3, until uniformly stirred, conveying to a concrete tank truck for transportation.
4. The method for prefabricating a reinforced concrete cylinder according to claim 1, wherein S2 is specifically: S2.1, pushing the concrete cylinder to the front edge of the wharf by a rail car; s2.2, loading by using a crane ship, and transporting to a base by self-voyage square barge.
5. The method for prefabricating a reinforced concrete cylinder according to claim 1, wherein S3 is specifically: s3.1, the top and the bottom of the steel cylinder are respectively provided with a thickness reinforcing plate, a plurality of vertical ribs are arranged from below the top reinforcing plate to above the bottom reinforcing plate, and a plurality of reinforcing transverse ribs are arranged in the horizontal direction; s3.2, welding an annular steel box girder at the top of the steel cylinder, wherein a plurality of convex shear keys are arranged at the top of the steel box girder, and the positions of the convex shear keys correspond to the concave shear grooves of the reinforced concrete cylinder and are matched in size; S3.3, arranging a plurality of wide mortises on the outer wall of the steel cylinder for installing the auxiliary grid.
6. The method for prefabricating a reinforced concrete cylinder according to claim 1, wherein S4 is specifically: S4.1, the adopted round steel passes through a concrete cylinder embedded steel pipe, the upper side is connected and fastened with a hoisting frame, and the lower side is connected and screwed with a steel cylinder annular steel box girder; s4.2, screwing the screw rod and the internal thread of the annular steel box girder, and welding two reinforcing plates at corresponding positions of the bottom of the steel box girder.
7. The method for prefabricating a reinforced concrete cylinder according to claim 1, wherein S5 is specifically: s5.1, loading and fixing the cylinder by a crane ship after the cylinder is assembled; s5.2, the semi-submersible ship is transported to an output harbor pool through a water channel to be transported to a construction site.
8. The method for prefabricating a reinforced concrete cylinder according to claim 1, wherein S6 is specifically: S6.1, mounting sand prevention rubber at an interface of a wide mortice before sinking of the cylinder, attaching water stop rubber on a locking notch of a secondary grid T, configuring a vibration hammer set for the single cylinder to integrally sink by using a crane ship, forming a linkage vibration sinking system structure by using a vibration hammer, adopting an annular steel box girder as a lifting frame of a vibration sinking hammer set clamp at the top, and realizing synchronous vibration sinking of the steel cylinder and the concrete cylinder in a mode of transmitting vibration excitation force by a dowel bar, wherein the secondary grid vibration sinking sequence is carried out according to the vibration sinking sequence of the steel cylinder; S6.2, before the auxiliary grid is inserted, accurately measuring the distance between the wide mortises at the upper ends of the two steel cylinders to be inserted into the auxiliary grid and the perpendicularity deviation of the steel cylinders, and calculating the distance between locking openings at the lower ends of the auxiliary grid according to the perpendicularity deviation; S6.3, arranging an arc-shaped hanging frame at the top end of the auxiliary grid, connecting a hook head of a crane ship with the hanging frame through a steel wire rope, and inserting the auxiliary grid into a steel cylinder locking port at one end and then inserting the other steel cylinder locking port after the auxiliary grid is erected; s6.4, manually turning up the sand control rubber before vibrating and sinking the auxiliary grid, facilitating the auxiliary grid to be inserted into the wide tenon groove, and lifting the hydraulic vibration hammer set by the crane ship after self-sinking is finished, and clamping the auxiliary grid by the hydraulic clamp and starting the hydraulic vibration hammer; S6.5, after the auxiliary grid is sunk, water stopping materials are poured into the mortises.
9. The method for prefabricating a reinforced concrete cylinder according to claim 1, wherein S7 is specifically: S7.1, backfilling the coarse sand in the cylinder and the auxiliary grid bin according to the vibration and sedimentation sequence of the steel cylinder and the auxiliary grid, and filling the broken stone cushion layer according to the sedimentation cylinder sequence; S7.2, immediately backfilling by adopting a belt sand carrier backfilling process after the steel cylinder and the auxiliary grid are vibrated and submerged to the designed elevation, wherein the sand carrier resides in front of the steel cylinder, and the belt conveyor conveys coarse sand into the cylinder and the auxiliary grid bin; s7.3, conveying the crushed stones by using a belt ship, and then transporting the crushed stones to a stone throwing ship after the crushed stones are transported to the site; S7.4, fixed-point quantitative casting and filling are carried out by an excavator on the stone slinger, and elevation is measured by a water weight while casting.
10. The method for prefabricating a reinforced concrete cylinder according to claim 1, wherein S8 is specifically: S8.1, when the cylinder and the auxiliary grid are removed, the cylinder and the auxiliary grid are carried out in the reverse order of the installation; s8.2, when the cylinder is removed, the nut and the rubber plug are completely removed; S8.3, hoisting and moving the annular hoisting box girder to other places by using a crane ship; S8.4, vertically lifting the concrete cylinder by adopting another crane ship; s8.5, after the concrete cylinder is lifted away, connecting the dowel bar with the annular lifting box girder again, and adopting a crane ship to configure a vibrating hammer group system to pull the steel cylinder while vibrating, lifting the steel cylinder to a self-propelled barge, and transporting the steel cylinder and the concrete cylinder to a designated place; s8.6, the auxiliary grid is pulled out by using the vibrating hammer set while vibrating, and the ship is loaded to the appointed place after pulling out.

Description

Reinforced concrete cylinder prefabrication method Technical Field The invention belongs to the technical field of concrete member manufacturing, and particularly relates to a reinforced concrete cylinder prefabricating method. Background The background technology of the reinforced concrete cylinder as a temporary cofferdam structure is derived from the limitations of schemes such as steel sheet piles, locking steel pipe piles, all-steel cylinders and the like in the traditional ocean engineering. Although the prior art has the convenience in construction, the problems of high manufacturing cost, insufficient durability, dependence on complex reinforcing measures on water stopping performance and the like exist. In particular to the geological conditions of deep and medium channel western artificial island mucky soil layers, the traditional steel cylinder is difficult to dismantle and can not be recycled due to overlarge friction resistance between the dead weight and the mucky soil layers. In order to break through the bottlenecks, a steel-concrete combined structure has been developed, and by combining the reinforced concrete section with the steel cylinder section, not only the durability and economy of concrete are utilized, but also the silt resistance is avoided by optimizing the height configuration, so that the detachable recycling is realized. The technology integrates modern technologies such as prefabrication and assembly, hydraulic linkage vibration and sedimentation and the like, and provides an innovative solution for temporary cofferdam engineering under complex hydrogeology conditions. In the current engineering construction field, the existing temporary cofferdam technology exposes quite remarkable limitations when facing deep water complex geological conditions. From the aspect of material structure, the structural design is extremely single, and steel is excessively relied on to construct the cofferdam. The method has a plurality of defects, namely the method is firstly characterized in the aspect of manufacturing cost, and the construction cost of the cofferdam is greatly increased due to the large amount of steel materials, and the price is high, so that a heavy economic burden is definitely brought to the project. Moreover, the durability of the cofferdam made of steel is obviously insufficient, the cofferdam is very easy to be corroded by seawater under the condition of being in a seawater environment for a long time, and meanwhile, the impact force of the cofferdam is difficult to bear when the cofferdam is impacted by common wind and waves on the sea, so that the service life of the cofferdam is greatly shortened. From the viewpoint of construction efficiency, the existing temporary cofferdam construction mode is low in efficiency. In the case of construction using steel sheet piles, the steel sheet piles are driven into the ground one by one, and the construction method not only consumes a great deal of time and labor, but also has poor continuity in the construction process, and seriously affects the overall construction progress. For the construction scheme adopting the steel cylinder, the process of the sectional vibration sinking is extremely complicated, each link needs to be strictly operated according to specific requirements, and the performance of the whole cofferdam can be possibly affected by a little carelessness. Moreover, the problem of leakage easily occurs at the locking notch connection part of the steel cylinder, and in order to ensure the waterproof performance of the cofferdam, grouting reinforcement work is required to be additionally carried out, so that the construction cost and time are further increased. In addition, conventional temporary cofferdam schemes appear to be particularly unadapted in the face of specific geological conditions. Taking a mucky soil layer of a western artificial island as an example, the soil layer has high water stopping requirement, and the conventional temporary cofferdam technology cannot effectively meet the requirement. In the stage of demolishing the temporary cofferdam, steel sheet piles or steel cylinders are difficult to be completely recovered due to their high frictional resistance in the sludge. Therefore, not only is the waste of materials caused, but also due economy is lacking, and the environment-friendly and reusable development concept advocated by the current great force is contrary to the development concept, so that the requirements of engineering on environment protection and resource utilization are difficult to meet. Disclosure of Invention In order to solve the problem of poor environmental protection in the prior art, the invention provides a reinforced concrete cylinder prefabricating method, which adopts a cylinder to combine with auxiliary grids to achieve the effect of integrally dismantling and recycling, and the concrete technical scheme is that the reinforced concrete cylinder prefabricating method