Method for installing an underwater precast component

Abstract

The application discloses an underwater prefabricated component installation method, wherein a pull ring is embedded on an underwater base surface, and a lifting ring is embedded on the top surface of a prefabricated component; one end of a traction rope is connected to the front lifting ring of a first prefabricated component, the other end of the traction rope passes through the pull ring, the first prefabricated component is lifted to the upper side of the target position, the traction rope is pulled to drive the first prefabricated component to approach the target position, the first prefabricated component is lowered to the underwater base surface, and the first prefabricated component is positioned when the traction rope cannot be pulled; one end of the traction rope is connected to the front lifting ring of a current prefabricated component, the other end of the traction rope passes through the rear lifting ring of a previous prefabricated component, the current prefabricated component is lifted to the upper side of the previous prefabricated component, the traction rope is pulled to drive the current prefabricated component to approach the previous prefabricated component, the current prefabricated component is lowered to the underwater base surface, and the current prefabricated component is positioned when the traction rope cannot be pulled.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic engineering, and specifically relates to a method for installing underwater prefabricated components. Background Technology

[0002] In the construction of projects such as airports, docks, and river management, there is often the installation of underwater prefabricated components. Due to the influence of water buoyancy, ocean waves, and tides, it is difficult to control the precision of underwater installation, which affects the progress and quality of the project. The current solution is to avoid construction during wind and wave cycles and to make multiple underwater fine adjustments after installation. However, the construction period is uncontrollable and the construction cost is high. Summary of the Invention

[0003] The purpose of this invention is to provide an underwater prefabricated component installation method that enables one-time precise positioning and installation of prefabricated components without the need for multiple underwater fine-tuning, making the construction period controllable, reducing construction costs, and enhancing construction accuracy and safety.

[0004] The technical solution adopted in this invention is:

[0005] A method for installing underwater precast components involves pre-embedding a pull ring near the target position of the first precast component on the underwater base surface, and pre-embedding lifting rings at the front and rear of the top of the precast component. When installing the first precast component, one end of a traction rope is connected to the front lifting ring of the first precast component, and the other end of the traction rope is passed through the pull ring and extends out of the water surface. A lifting device uses two sets of hooks to hang on the front and rear lifting rings of the first precast component, respectively, and lifts the first precast component to a position near the target. Then, the traction rope is pulled, moving the first precast component closer to the target position, while simultaneously lowering the first precast component to the underwater base surface. When the rope can no longer be pulled, the first precast component is moved into place. When installing the remaining precast components, first connect one end of the traction rope to the front lifting ring of the current precast component, and pass the other end of the traction rope through the rear lifting ring of the previous precast component and extend it out of the water. The lifting equipment hangs on the front and rear lifting rings of the current precast component through two sets of hooks respectively and lifts the current precast component to the vicinity of the previous precast component. Then pull the traction rope to move the current precast component closer to the previous precast component, and at the same time lower the current precast component to the underwater base surface. When the traction rope can no longer be pulled, the current precast component is connected to the previous precast component in place.

[0006] Furthermore, the precast component is equipped with a mechanical automatic unhooking mechanism; the automatic unhooking mechanism includes a baffle pre-embedded near the lifting ring, on which a spring and a pair of side plates are fixed, with the spring located between the pair of side plates; during lifting, the hook is hooked on the lifting ring and tightened together with the lifting rope, with the hook located between the pair of side plates, and the tightened hook compresses the spring on the baffle; after the precast component is lowered to the underwater base surface, the lifting rope and hook are released, the spring resets and ejects the hook from the lifting ring, realizing automatic unhooking.

[0007] Furthermore, the lifting ring is made by bending a whole round steel bar, with both ends of the round steel bar located inside the precast component and curving upwards, and the middle protruding upwards from the precast component to form a ring.

[0008] Furthermore, before casting the precast components, the lifting ring is welded and fixed to the reinforcing steel of the precast components, and before casting the underwater base, the pull ring is welded and fixed to the reinforcing steel of the underwater base surface; the lifting ring is protected when casting the precast components, and the pull ring is protected when casting the underwater base surface.

[0009] Furthermore, after all the prefabricated components are installed, the joints between the prefabricated components are inspected, and if gaps are found, grouting is performed.

[0010] The beneficial effects of this invention are:

[0011] This invention enables one-time precise positioning and installation of prefabricated components without the need for multiple underwater fine-tunings. The construction period is controllable and the construction cost is low. In addition to pulling the prefabricated components to the predetermined position, the traction rope can also prevent the prefabricated components from swinging too much under wind and waves, thereby enhancing construction accuracy and safety. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the installation of the first prefabricated component in an embodiment of the present invention.

[0013] Figure 2 This is a schematic diagram of the installation of other prefabricated components in an embodiment of the present invention.

[0014] Figure 3 This is a schematic diagram of the installation of the automatic unhooking mechanism and the hook in an embodiment of the present invention.

[0015] Figure 4 This is a schematic diagram of the lifting ring before it is pre-embedded in an embodiment of the present invention.

[0016] In the diagram: 1-lifting rope; 2-hook; 3-ring; 4-prefabricated component; 5-underwater base surface; 6-pull ring; 7-traction rope; 8-baffle; 9-spring; 10-side plate. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 and Figure 2 As shown, an underwater prefabricated component installation method involves pre-embedding a pull ring 6 near the target position of the first prefabricated component 4 on the underwater base surface 5, and pre-embedding a lifting ring 3 at the front and rear of the top of the prefabricated component 4; as shown... Figure 1As shown, when installing the first precast component 4, one end of the traction rope 7 is first connected to the front lifting ring 3 of the first precast component 4. The other end of the traction rope 7 is passed through the pull ring 6 and extends out of the water. The lifting equipment uses two sets of hooks 2 to hang on the front and rear lifting rings 3 of the first precast component 4 respectively, and lifts the first precast component 4 to a position near the target location. Then, the traction rope 7 is pulled to move the first precast component 4 closer to the target location, and at the same time, the first precast component 4 is lowered to the underwater base surface 5. When the traction rope 7 can no longer be pulled, the first precast component 4 has moved into place. Figure 2 As shown, when installing the remaining precast components 4, first connect one end of the traction rope 7 to the front lifting ring 3 of the current precast component 4. Pass the other end of the traction rope 7 through the rear lifting ring 3 of the previous precast component 4 and extend it out of the water. The lifting equipment uses two sets of hooks 2 to hang on the front and rear lifting rings 3 of the current precast component 4 respectively, lifting the current precast component 4 to a position near and above the previous precast component 4. Then, pull the traction rope 7, moving the current precast component 4 closer to the previous precast component 4, while simultaneously lowering the current precast component 4 to the underwater base surface 5. When the traction rope 7 can no longer be pulled, the current precast component 4 is properly aligned with the previous precast component 4. This method enables precise one-time positioning and installation of the precast component 4, eliminating the need for multiple underwater fine-tuning adjustments. The construction period is controllable, and the construction cost is low. In addition to pulling the precast component 4 to the predetermined position, the traction rope 7 also prevents excessive swaying of the precast component 4 under wind and waves, enhancing construction accuracy and safety.

[0019] like Figure 3 As shown, in this embodiment, the precast component 4 is equipped with a mechanical automatic unhooking mechanism. The automatic unhooking mechanism includes a baffle 8 pre-embedded near the lifting ring 3, with a spring 9 and a pair of side plates 10 fixed on the baffle 8. The spring 9 is located between the pair of side plates 10. During lifting, the hook 2 is hooked onto the lifting ring 3 and tightened together with the lifting rope 1. The hook 2 is located between the pair of side plates, and the tightened hook 2 compresses the spring 9 onto the baffle 8. After the precast component 4 is lowered to the underwater base surface 5, the lifting rope 1 and hook 2 are released, the spring 9 resets, and the hook 2 pops out of the lifting ring 3, achieving automatic unhooking. The automatic unhooking mechanism eliminates the need for workers to dive underwater to unhook the hook, improving construction efficiency.

[0020] like Figure 4 As shown, in this embodiment, the lifting ring 3 is formed by bending a whole round steel bar. The two ends of the round steel bar are located inside the prefabricated component 4 and are curved upwards, while the middle protrudes upwards from the prefabricated component 4 to form a ring.

[0021] In this embodiment, before pouring the precast component 4, the lifting ring 3 is welded and fixed to the reinforcing steel of the precast component 4, and before pouring the underwater base surface 5, the pull ring 6 is welded and fixed to the reinforcing steel of the underwater base surface 5; the lifting ring 3 is protected when pouring the precast component 4, and the pull ring 6 is protected when pouring the underwater base surface 5.

[0022] In this embodiment, after all the prefabricated components 4 are installed, the joints of the prefabricated components 4 are inspected, and if gaps are found, grouting is performed.

[0023] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for installing underwater prefabricated components, characterized in that: A pull ring is pre-embedded near the target position of the first precast component on the underwater base surface, and a lifting ring is pre-embedded at the front and rear of the top of the precast component. When installing the first precast component, one end of the traction rope is first connected to the lifting ring at the front of the first precast component, and the other end of the traction rope is passed through the pull ring and extends out of the water surface. The lifting equipment is hung on the front and rear lifting rings of the first precast component through two sets of hooks respectively and the first precast component is lifted to the vicinity of the target position. Then the traction rope is pulled to move the first precast component closer to the target position and at the same time the first precast component is lowered to the underwater base surface. When the traction rope can no longer be pulled, the first precast component has moved into place. When installing the remaining precast components, first connect one end of the traction rope to the front lifting ring of the current precast component, and pass the other end of the traction rope through the rear lifting ring of the previous precast component and extend it out of the water. The lifting equipment uses two sets of hooks to hang on the front and rear lifting rings of the current precast component respectively and lifts the current precast component to the vicinity of the previous precast component. Then pull the traction rope to bring the current precast component closer to the previous precast component and lower the current precast component to the underwater base surface. When the traction rope can no longer be pulled, the current precast component is connected to the previous precast component in place. The precast component is equipped with a mechanical automatic unhooking mechanism. The automatic unhooking mechanism includes a baffle pre-embedded near the lifting ring, on which a spring and a pair of side plates are fixed, with the spring located between the pair of side plates. During lifting, the hook is hooked onto the lifting ring and tightened together with the lifting rope. The hook is located between the pair of side plates, and the tightened hook compresses the spring on the baffle. After the precast component is lowered to the underwater base, the lifting rope and hook are released, the spring returns to its original position, and the hook pops out of the lifting ring, achieving automatic unhooking.

2. The underwater prefabricated component installation method as described in claim 1, characterized in that: The lifting ring is made by bending a whole round steel bar. The two ends of the round steel bar are located inside the precast component and curve upwards, while the middle protrudes upwards from the precast component to form a ring.

3. The underwater prefabricated component installation method as described in claim 1, characterized in that: Before casting precast components, the lifting ring is welded and fixed to the reinforcing steel of the precast components. Before casting the underwater base, the pull ring is welded and fixed to the reinforcing steel of the underwater base. The lifting ring is protected when casting precast components, and the pull ring is protected when casting the underwater base.

4. The underwater prefabricated component installation method as described in claim 1, characterized in that: After all prefabricated components are installed, the joints between the prefabricated components are inspected. If gaps are found, grouting is performed.

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