Support-free self-correcting pile position assembly type wharf node structure and construction method thereof

Abstract

This invention discloses a prefabricated wharf node structure with self-aligning pile positions that requires no support and its construction method, belonging to the field of port engineering technology. One such prefabricated wharf node structure with self-aligning pile positions includes: a prefabricated lower crossbeam, prefabricated pile foundations, steel pipes, and diagonal braces. The prefabricated lower crossbeam has an upper cavity and a lower cavity, with a certain space extending around the lower cavity, giving the overall cavity cross-section of the prefabricated lower crossbeam a convex shape. The prefabricated pile foundation is located directly below the upper cavity of the prefabricated lower crossbeam, and a steel pipe is embedded within the prefabricated pile foundation. The top of the steel pipe protrudes from the top of the prefabricated lower crossbeam, and diagonal braces are welded around the steel pipe. This invention utilizes the self-weight of the prefabricated lower crossbeam and the wedge-shaped side ribs formed by the steel pipes and diagonal braces to automatically align the prefabricated lower crossbeam and prefabricated pile foundation, improving installation accuracy. It also eliminates the need for support measures such as clamps, reducing the workload of waterborne operations, and significantly increasing the prefabrication rate, thus accelerating the construction progress.

Description

Technical Field

[0001] This invention relates to the field of port engineering technology. More specifically, this invention relates to a prefabricated wharf node structure with self-correcting, unsupported pile positions and its construction method. Background Technology

[0002] Among port terminal structures, high-pile wharves are the most widely used. High-pile wharves are characterized by their lightweight structure, versatility, excellent wave reduction effect, and strong adaptability to water level changes. However, they also involve large investments, long construction periods, strict water level requirements during construction, and significant safety hazards. How to construct wharves quickly and safely and put them into operation as soon as possible is a common aspiration of owners and construction companies. Currently, with the rise of prefabricated wharves, the pile foundations, longitudinal beams, panels, and prestressed hollow slabs in high-pile wharf construction have all achieved prefabricated construction. However, the crossbeams mostly use traditional cast-in-place structures, which are more complex to construct and have a longer construction period, greatly restricting the development of prefabricated wharves. How to solve the connection between precast pipe piles and precast crossbeams, and how to correct pile misalignment, is a significant challenge. Summary of the Invention

[0003] The purpose of this invention is to provide a prefabricated wharf node structure and its construction method that requires no support and has self-correcting pile positions. It can utilize the self-weight of the prefabricated lower crossbeam and the wedge-shaped side ribs formed by the steel pipe and the diagonal brace to automatically correct and align the prefabricated lower crossbeam and the prefabricated pile foundation, thereby improving installation accuracy. At the same time, it eliminates the need for support measures such as clamps, reducing the amount of work on the water and also greatly increasing the prefabrication rate and accelerating the construction progress.

[0004] The technical solution adopted by the present invention to solve this technical problem is: to provide a prefabricated wharf node structure with self-correcting pile position without support, including: prefabricated lower crossbeam, prefabricated pile foundation, steel pipe and diagonal brace;

[0005] The prefabricated lower crossbeam has an upper cavity and a lower cavity. The lower cavity extends out a certain space around its perimeter, so that the overall cavity cross-section of the prefabricated lower crossbeam has a convex shape.

[0006] The precast pile foundation is located directly below the cavity of the precast lower crossbeam. A steel pipe is embedded in the precast pile foundation, and the top of the steel pipe protrudes from the top of the precast lower crossbeam. Diagonal braces are welded around the steel pipe.

[0007] Preferably, the prefabricated wharf node structure with self-correcting, unsupported pile positions is characterized in that the diameter of the upper cavity is the same as the diameter of the inner cavity of the precast pile foundation, and the lower cavity is 400mm high, with a diameter 400mm larger than that of the precast pile foundation.

[0008] Preferably, the prefabricated wharf node structure with self-correcting, unsupported pile positions is characterized in that the diameter of the steel pipe is smaller than the diameter of the cavity inside the precast pile foundation, and the bottom of the steel pipe is closed.

[0009] Preferably, the prefabricated wharf node structure with self-correcting, unsupported pile positions is characterized in that a steel positioning plate is installed on the top of the precast pile foundation.

[0010] Preferably, the prefabricated wharf node structure with self-correcting unsupported piles is characterized in that the diameter of the upper cavity is greater than or equal to the diameter of the circle formed at the bottom of the diagonal brace, and the greater value is not greater than 140mm.

[0011] Preferably, the present invention also provides a construction method for a prefabricated wharf using self-correcting piles in a prefabricated wharf node structure, characterized by comprising:

[0012] a. Underwater rock placement; b. After driving the precast pile foundation into the water, embed steel pipes into the precast pile foundation; c. First, reserve the upper and lower cavities in the lower crossbeam during precasting, and then perform core grouting treatment in the embedded lower crossbeam until the concrete strength of the lower crossbeam reaches 80%; d. Complete the hoisting and positioning of the lower crossbeam through the self-correcting function of the node structure; e. Evenly arrange grouting holes in the upper cavity, lower cavity, precast pile foundation cavity and steel pipe and perform grouting; f. After the grouting strength reaches 100%, hoist the π-shaped plate; g. Reserve the extended reinforcing bars between the precast lower crossbeam and the two π-shaped plates, complete the welding, set the template at the node and perform pouring; h. The panel and other facilities are constructed according to relevant specifications.

[0013] Preferably, the construction method of the prefabricated wharf with the self-correcting pile position of the structure is characterized in that, in step c, the specific method of embedding the lower crossbeam is: fixing the end of the reinforcing bar in the concrete of the lower crossbeam and then welding it together.

[0014] Preferably, the construction method of the prefabricated wharf with the self-correcting pile position of the structure is characterized in that, in step c, the specific method of core filling of the lower crossbeam is as follows: when the lower crossbeam is prefabricated, an upper cavity and a lower cavity are reserved for cast-in-place nodes, and cast-in-place operation and core filling treatment inside the upper cavity are carried out at the same time.

[0015] The present invention has at least the following beneficial effects:

[0016] 1. The present invention provides a prefabricated wharf node structure and its construction method for a self-correcting pile position without support, which can greatly realize the prefabrication rate and accelerate the construction progress.

[0017] 2. By utilizing the convex-shaped structure formed by the upper and lower cavities of the precast pile foundation, there is no need to install support measures such as clamps, thus reducing the workload of water-based operations.

[0018] 3. Taking advantage of the long cantilever of the precast pile foundation and the certain degree of freedom at the pile top, by setting this node, the precast lower crossbeam can be automatically corrected and aligned with the precast pile foundation by utilizing the self-weight of the precast lower crossbeam and the wedge-shaped side ribs formed by the steel pipe and the diagonal brace, thereby improving the installation accuracy.

[0019] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0020] Figure 1 This is a diagram showing the connection between the lower crossbeam and the pile foundation of a prefabricated wharf with a self-correcting, unsupported pile position.

[0021] Figure 2 This is a diagram showing the connection between the crossbeams and longitudinal beams in a prefabricated wharf with a self-correcting pile position that does not require support.

[0022] Explanation of reference numerals in the attached drawings: 1. Upper cavity, 2. Diagonal brace, 3. Lower cavity, 4. Precast lower crossbeam, 5. Steel pipe, 6. Precast pile foundation, 7. Precast π-shaped slab (longitudinal beam). Detailed Implementation

[0023] The present invention will now be described in detail and completely with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be particularly noted that the technical solutions and features provided in various parts of the present invention, including the following description, can be combined with each other without conflict.

[0024] Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific implementation process is as follows:

[0026] like Figure 1 As shown: A prefabricated wharf node structure with self-correcting pile positions without support, including: a prefabricated lower crossbeam 4, a prefabricated pile foundation 6, a steel pipe 5 and a diagonal brace 2;

[0027] The prefabricated lower crossbeam 4 has an upper cavity 1 and a lower cavity 3. The lower cavity 3 extends a certain space around its perimeter, so that the overall cavity cross section of the prefabricated lower crossbeam 4 has a convex shape. This structure can achieve the function of no support, without the need to set up support measures such as clamps, thus reducing the workload of water operations.

[0028] The precast pile foundation 6 is located directly below the upper cavity 1 of the precast lower crossbeam 4. A steel pipe 5 is embedded in the precast pile foundation 6, and the top of the steel pipe 5 protrudes from the top of the precast lower crossbeam 4. Diagonal braces 2 are welded around the steel pipe 5. When the diagonal braces 2, steel pipe 5 and upper cavity 1 are overlapped, self-correction can be performed, which effectively solves the problem of positional misalignment between the precast crossbeam and the pile foundation during construction.

[0029] Furthermore, the prefabricated wharf node structure with self-correcting, unsupported pile positions is characterized in that the diameter of the upper cavity 1 is the same as the diameter of the inner cavity of the precast pile foundation 6, and the lower cavity 3 is 400mm high, with a diameter 400mm larger than the diameter of the precast pile foundation 6. The diameters of the upper cavity 1 and the lower cavity 3 depend on the diameter and sidewall thickness of the precast pile foundation 6, and the axes of the upper cavity 1, the lower cavity 3, the inner cavity of the precast pile foundation 6, and the steel pipe 5 in the precast lower crossbeam coincide.

[0030] Furthermore, the prefabricated wharf node structure with unsupported self-correcting pile positions is characterized in that the diameter of the steel pipe 5 is smaller than the diameter of the cavity inside the precast pile foundation 6, and the bottom of the steel pipe 5 is closed. In this embodiment, a preferred implementation is that the diameter of the steel pipe 5 is 400mm and the length of the steel pipe 5 is 4500mm.

[0031] Furthermore, the prefabricated wharf node structure with unsupported self-correcting pile positions is characterized in that a steel structure positioning plate is installed on the top of the precast pile foundation 6. This steel structure positioning plate can effectively fix the position of the precast pile foundation 6 and the steel pipe 5.

[0032] Furthermore, the prefabricated wharf node structure with self-correcting, unsupported pile positions is characterized in that the diameter of the upper cavity is greater than or equal to the diameter of the circle formed by the bottom of the diagonal brace, and the greater value is not greater than 140mm. The bottom of the diagonal brace 2 is installed on the steel structure positioning plate, and the wedge-shaped structure formed by the steel pipe 5 and the diagonal brace 2 can effectively solve the correction problem and improve the installation accuracy.

[0033] Furthermore, the present invention also provides a construction method for a prefabricated wharf using self-correcting, unsupported pile positions in the prefabricated wharf node structure, characterized by comprising:

[0034] a. Underwater rock placement; Select 10-100kg stones for underwater rock placement, and use a benchmark to control the horizontal position. When the current velocity is high or the water depth is deep, a trial placement method can be used to determine the lead time for the stones. By throwing the stones underwater, a layer of stones of a certain thickness is formed to cover the protected embankment, which helps to resist the natural forces of water flow and waves, ensuring the safety and stability of the embankment.

[0035] b. After driving the precast pile foundation 6 into the water, embed the steel pipe 5 inside the precast pile foundation 6. The water-based pile driving is carried out using a walking pile driving device. Pile driving is controlled by both the pile bottom elevation and penetration depth indicators, with the specific control determined based on geological conditions, prioritizing either the pile bottom elevation or the penetration depth. When the inland river has shelter, the allowable deviation of the precast pile foundation 6 is 100mm for straight piles and 150mm for inclined piles. When the near-shore waters are unprotected, the allowable deviation of the precast pile foundation 6 is 150mm for straight piles and 200mm for inclined piles. After pile driving, embed the steel pipe 5 inside the precast pile foundation 6 and seal the bottom of the steel pipe 5.

[0036] c. First, during the prefabrication of the precast lower crossbeam 4, the upper cavity 1 and the lower cavity 3 are reserved. Then, the embedded precast lower crossbeam 4 is filled with core (UHPC) to ensure a rigid connection. The precast lower crossbeam 4 can be hoisted only when the concrete strength reaches 80%.

[0037] d. The precast lower crossbeam 4 is hoisted and positioned by the self-correcting function of the node structure. The hoisting and positioning of the precast lower crossbeam 4 is based on ensuring the accurate position of the precast lower crossbeam 4. The precast pile foundation 6 has a long cantilever and the pile top has a certain degree of freedom. Utilizing the self-weight of the precast lower crossbeam 4 and the wedge-shaped side ribs formed by the steel pipe 5 and the diagonal brace 2, during the installation and descent of the precast lower crossbeam 4, the wedge-shaped structure formed by the steel pipe 5 and the diagonal brace 2 can generate a horizontal force. This horizontal force can enable the precast pile foundation 6 to automatically align and correct itself.

[0038] e. Grouting holes are evenly arranged in the upper cavity 1, lower cavity 3, inner cavity of precast pile foundation 6 and steel pipe 5 and grouting is carried out; the diameter of the grouting holes is 100mm, the vertical spacing is not greater than 400mm, and they are evenly arranged. After the grouting is completed and the acceptance is qualified, the reserved grouting holes are sealed.

[0039] like Figure 2 As shown: f. After the grouting strength reaches 100%, the π-shaped plate 7 (longitudinal beam) will be hoisted;

[0040] g. Extended reinforcing bars are reserved between the precast lower crossbeam 4 and the two π-shaped plates 7 (longitudinal beams) to ensure that the main reinforcing bars of the precast lower crossbeam 4 are welded to the main reinforcing bars of the π-shaped plates 7 (longitudinal beams). After the π-shaped plates 7 (longitudinal beams) are hoisted, the reinforcing bars are welded, and formwork is set at the joint and the concrete is poured.

[0041] h. Panels and other facilities shall be constructed in accordance with relevant specifications. Surface layer construction, followed by the final installation of auxiliary and protective facilities.

[0042] Furthermore, the construction method of the prefabricated wharf with the self-correcting pile positions of the aforementioned structure is characterized in that, in step c, the specific method for embedding the precast lower crossbeam 4 is as follows: the ends of the reinforcing bars are fixed inside the concrete of the precast lower crossbeam 4 and then welded together. This is used to enhance the tensile strength and bearing capacity of the concrete.

[0043] Furthermore, the construction method of the prefabricated wharf with the self-correcting pile position of the structure is characterized in that, in step c, the specific method of core grouting of the precast lower crossbeam 4 is as follows: when the lower crossbeam 4 is prefabricated, the upper cavity 1 and the lower cavity 3 are reserved for cast-in-place joints, and the cast-in-place operation and core grouting treatment of the upper cavity 1 are carried out simultaneously. The advantage of using UHPC ultra-high performance concrete for core grouting is that UHPC has certain strength, high impermeability, and excellent durability, which can maximize the service life of the concrete structure and reduce the project cost.

[0044] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A prefabricated wharf node structure with self-correcting, unsupported pile positions, characterized in that, include: Precast lower crossbeam, precast pile foundation, steel pipe and diagonal bracing; The prefabricated lower crossbeam has an upper cavity and a lower cavity. The lower cavity extends out a certain space around its perimeter, so that the overall cavity cross-section of the prefabricated lower crossbeam has a convex shape. The precast pile foundation is located directly below the cavity of the precast lower crossbeam. A steel pipe is embedded in the precast pile foundation, and the top of the steel pipe protrudes from the top of the precast lower crossbeam. Diagonal braces are welded around the steel pipe.

2. The prefabricated wharf node structure with unsupported self-correcting pile positions as described in claim 1, characterized in that, The upper cavity has the same diameter as the inner cavity of the precast pile foundation, and the lower cavity has a height of 400mm and a diameter that is 400mm larger than the diameter of the precast pile foundation.

3. The prefabricated wharf node structure with unsupported self-correcting pile positions as described in claim 1, characterized in that, The diameter of the steel pipe is smaller than the diameter of the cavity inside the precast pile foundation, and the bottom of the steel pipe is closed.

4. The prefabricated wharf node structure with unsupported self-correcting pile positions as described in claim 1, characterized in that, A steel positioning plate is installed on the top of the precast pile foundation.

5. The prefabricated wharf node structure with unsupported self-correcting pile positions as described in claim 1, characterized in that, The diameter of the upper cavity is greater than or equal to the diameter of the circle formed at the bottom of the diagonal brace, but the greater value is not greater than 140mm.

6. A construction method for a prefabricated wharf utilizing self-correcting, unsupported pile positions as described in any one of claims 1 to 5, characterized in that, include: a. Underwater stone throwing; b. After driving the precast piles into the water, embed steel pipes into the precast piles; c. First, reserve the upper and lower cavities in the lower crossbeam during precasting, and then perform core grouting treatment in the embedded lower crossbeam until the concrete strength of the lower crossbeam reaches 80%; d. Complete the hoisting and positioning of the lower crossbeam through the self-correcting function of the node structure; e. Evenly arrange grouting holes in the upper cavity, lower cavity, precast pile foundation cavity and steel pipe and perform grouting; f. After the grouting strength reaches 100%, hoist the π-shaped plate; g. Reserve the extended reinforcing bars between the precast lower crossbeam and the two π-shaped plates, complete the welding, set the template at the node and pour the concrete; h. The panels and other facilities are constructed according to relevant specifications.

7. The construction method of the prefabricated wharf with unsupported self-correcting pile positions as described in claim 6, characterized in that, In step c, the specific method for embedding the lower crossbeam is as follows: the end of the reinforcing bar is fixed in the concrete of the lower crossbeam and then welded together.

8. The construction method of the prefabricated wharf with unsupported self-correcting pile positions as described in claim 6, characterized in that, In step c, the specific method for grouting the lower crossbeam is as follows: when the lower crossbeam is prefabricated, an upper cavity and a lower cavity are reserved for cast-in-place joints, and cast-in-place operations and grouting treatment are carried out simultaneously inside the upper cavity.

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