Underwater pile foundation reinforcement construction method

Abstract

The invention provides an underwater pile foundation reinforcement construction method, and relates to the technical field of bridge repair, the underwater pile foundation reinforcement construction method comprises the following steps: S1, pile foundation periphery riverbed treatment; s2, an overwater operation platform is erected around the pile foundation; s3, the pile foundation to be reinforced is subjected to steel bar planting treatment; s4, the steel plate pile casing is hoisted at the preset position and welded in stages; and S5, concrete is poured between the steel plate pile casing and the pile foundation. The underwater pile foundation can be effectively reinforced, the structural strength and durability of the pile foundation are improved, and safety and stability of structures such as bridges are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of bridge repair technology, and in particular to a method for underwater pile foundation reinforcement construction. Background Technology

[0002] During long-term use, the exposed portions of bridge pile foundations located in water generally face severe scouring problems. These problems are mainly manifested in the long-term scouring by water flow, which causes localized detachment of the protective layer of some pile foundations, further exacerbating the exposure of internal steel reinforcement, leading to problems such as exposed reinforcement, rust swelling, and exposed reinforcement. If not treated and protected in time, the scouring may endanger the pile foundation and potentially affect its bearing capacity.

[0003] These scouring problems directly weaken the structural strength and stability of the pile foundations, posing a direct and serious threat to the structural safety and durability of the bridge. To ensure the safe and stable operation of the bridge and extend its service life, scientific and effective measures must be taken for repair and reinforcement.

[0004] Traditional reinforcement and protection methods involve using earthen cofferdams to block water, followed by excavator dredging, backfilling with permeable materials, and then applying concrete for surface protection. This process is extensive, causes significant water pollution, is costly, and has a long construction period. Therefore, developing a new pile foundation reinforcement construction method suitable for underwater environments is particularly urgent and important to address the scour problem of underwater pile foundations.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a method for underwater pile foundation reinforcement to solve the problem of high engineering costs and water pollution caused by traditional reinforcement methods. The preferred technical solutions among the various technical solutions provided by this invention and their numerous technical effects are detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] The present invention provides a method for underwater pile foundation reinforcement construction, comprising the following steps:

[0009] S1. Riverbed treatment around the pile foundation;

[0010] S2. Construct a water-based work platform around the pile foundation;

[0011] S3. Rebar installation is carried out on the pile foundations that need reinforcement.

[0012] S4. Hoist the steel plate casing at the predetermined position and weld it in sections;

[0013] S5. Pour concrete between the steel plate casing and the pile foundation.

[0014] Preferably, in step S1, the silt around the pile foundation is cleared to expose the hard riverbed; if the silt is too deep, it is replaced with crushed stone.

[0015] Preferably, in step S3, the rebar installation process involves drilling anchor holes on the surface of the pile foundation above the water surface at the location where reinforcement is required, for inserting anchor bars to effectively fix the steel plate casing and prevent it from tilting or floating.

[0016] Preferably, the anchor bars are arranged horizontally in a radial pattern, with the spacing between two adjacent anchor bars being 1 / 4 of the pile foundation perimeter, and perpendicular to the wall surface of the steel plate casing.

[0017] Preferably, the diameter of the anchor bar is 20mm, and the depth of the anchor bar embedded in the anchor bar hole is 20cm.

[0018] Preferably, in step S4, the installation method of the steel plate casing includes: hoisting the steel plate casing segments one by one to the vicinity of the pile foundation, and connecting adjacent steel plate casing segments by transverse welding to form the steel plate casing.

[0019] Preferably, after S4 and before S5, the method further includes: backfilling sand into the bottom gap between the steel plate casing and the pile foundation to perform backfilling and fixing treatment, so as to achieve a tight connection between the bottoms of the two.

[0020] Preferably, in step S5, the concrete is self-compacting underwater concrete with small aggregates having a particle size of no more than 20mm. The underwater concrete is poured using the tremie pipe method. During the pouring process, the concrete is poured diagonally at the same time, with the pouring speeds on both sides being matched. The slump and pouring height of the concrete are checked at any time.

[0021] Preferably, the steel plate casing segment is formed by welding four steel plates on all four sides, and all welds are coated with anti-corrosion paint.

[0022] The preferred technical solution of the present invention can also produce at least the following technical effects:

[0023] This invention effectively avoids the severe corrosion problem of underwater pile foundations in existing technologies. The invention provides a method for reinforcing underwater pile foundations, comprising the following steps: S1, riverbed treatment around the pile foundation; S2, erecting a floating work platform around the pile foundation; S3, installing rebar into the pile foundation to be reinforced; S4, hoisting a steel plate casing at a predetermined location and welding it in sections; S5, pouring concrete between the steel plate casing and the pile foundation. This method can effectively reinforce underwater pile foundations, improve their structural strength and durability, and ensure the safety and stability of structures such as bridges. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic flowchart of an underwater pile foundation reinforcement construction method provided by the present invention;

[0026] Figure 2 This is a schematic diagram of the elevation of an underwater pile foundation after repair and reinforcement, provided by the present invention.

[0027] Figure 3 This is a schematic diagram of an underwater pile foundation after repair and reinforcement provided by the present invention;

[0028] In the picture:

[0029] 1. Pile foundation; 101. Anchor bar hole; 2. Steel plate casing; 201. Steel plate casing segment; 202. Transverse weld; 3. Anchor bar; 4. Tie beam; 5. Concrete; 6. Riverbed. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0031] like Figures 1-3 As shown, the present invention provides a method for underwater pile foundation reinforcement construction, comprising the following steps:

[0032] S1. Treatment of the riverbed 6 around pile foundation 1: Conduct on-site survey and assessment of the pile foundation 1 to be repaired. The survey includes, but is not limited to, the water depth of the part of pile foundation 1 to be reinforced, the elevation of the riverbed 6 and the water surface, and the thickness of the silt layer. Confirm that the repair part is in a shallow water area. Use an excavator to excavate the riverbed 6 around pile foundation 1. The excavation depth is ≤2m of silt thickness to fully expose the repair part of pile foundation 1. If the silt is deep, use rock dumping to squeeze out the silt to ensure that the riverbed 6 around pile foundation 1 is a hard surface.

[0033] S2. Construct a water-based work platform around pile foundation 1: Use scaffolding to construct a water-based work platform around pile foundation 1 to provide an operating platform for subsequent operations such as rebar installation, steel plate casing 2 hoisting, welding, and concrete pouring.

[0034] S3. Perform rebar installation on pile foundation 1 that needs reinforcement:

[0035] S301. Rebar installation treatment is carried out on pile foundation 1. For the part of pile foundation 1 above the water surface, anchor bar holes 101 are drilled evenly on the surface of the section of pile foundation 1 that needs to be reinforced and along the circumference of pile foundation 1, and then cleaned.

[0036] S302. The spacing between two adjacent anchor bars 3 is 1 / 4 of the perimeter of the pile foundation 1, and they are perpendicular to the wall of the steel plate casing 2. After the steel plate casing 2 is lowered into the riverbed 6, the anchor bars 3 are inserted to prevent the steel plate casing 2 from floating during the pouring process. The diameter of the anchor bar 3 is 20mm, and the depth of the anchor bar 3 embedded in the anchor bar hole 101 is 20cm. It is used to position the steel plate casing 2 to ensure that the verticality of the steel plate casing 2 meets the design requirements and to prevent the steel plate casing 2 from floating during the pouring of concrete 5.

[0037] S4. Hoist the steel plate casing 2 to the predetermined position and weld it in sections:

[0038] S401. Install multiple manual hoists on the upper part of the tie beam 4. Use the manual hoists to lift each 1cm thick steel plate to the installation position of the pile foundation 1, and weld them together to form a square steel plate casing segment 201 with a height of 50cm. Before the steel plate is lowered, apply necessary coating treatment to enhance its anti-corrosion performance.

[0039] S402. As per design requirements, use a manual hoist to lower the assembled steel plate casing segment 201, preparing for the installation of the next segment. Above the water surface, weld adjacent steel plate casing segments 201 laterally every 50cm to gradually form the steel plate casing 2. The upper end of the steel plate casing 2 is 30cm from the tie beam 4, and the lower end extends into the riverbed as needed. After connection, grind and paint the transverse welds 202 to ensure they are smooth and corrosion-resistant.

[0040] S403. After hoisting is completed, a comprehensive inspection is carried out on the position, inclination, top elevation, and distance between the steel plate casing and the pile foundation.

[0041] S404. Use sand to backfill and fix the bottom between the steel plate casing 2 and the pile foundation 1. Compact the backfilled sand to ensure that the foundation has sufficient density and water stability, and check whether the connection of the steel plate casing 2 is tight, without gaps or grout leakage.

[0042] S5. Pour concrete 5 between the steel casing 2 and the pile foundation 1:

[0043] S501. Use an attached vibrator to vibrate concrete 5 to ensure that concrete 5 is dense and free of voids. Use a ground pump as a pouring tool and use the tremie pipe method to pour underwater concrete 5. The concrete 5 can be smoothly delivered to the pouring position between the steel casing 2 and the pile foundation 1. During the pouring process, pour diagonally at the same time. During the pouring process, the mixing speed should be basically equal to the pouring speed to maintain the continuity of pouring. Check the slump and water-cement ratio of concrete 5 at any time to ensure that they are within the specified range.

[0044] S502. Take a sample of concrete 5 once for each pour, with at least two sets of specimens and three pieces in each set. Curing and strength testing of the specimens shall be carried out to ensure that the quality of concrete 5 meets the design requirements.

[0045] As an optional implementation, in S5, the concrete 5 is a self-compacting concrete 5 with small aggregates having a particle size of no more than 20 mm.

[0046] As an optional implementation, before S5, the structural dimensions of pile foundation 1 are checked using measuring instruments to ensure that they conform to the design requirements, and the coordinate position of the center point of pile foundation 1 is checked to ensure that it is accurate.

[0047] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0048] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "a particular example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for underwater pile foundation reinforcement construction, characterized in that, Includes the following steps: S1. Riverbed treatment around the pile foundation; S2. Construct a water-based work platform around the pile foundation; S3. Rebar installation is carried out on the pile foundations that need reinforcement. S4. Hoist the steel plate casing at the predetermined position and weld it in sections; S5. Pour concrete between the steel plate casing and the pile foundation.

2. The underwater pile foundation reinforcement construction method according to claim 1, characterized in that, In step S1, the silt around the pile foundation is cleared to expose the hard riverbed; if the silt is too deep, it is replaced with crushed stone.

3. The underwater pile foundation reinforcement construction method according to claim 1, characterized in that, In S3, the rebar installation process involves drilling anchor holes in the surface of the pile foundation above the water surface at the location where reinforcement is required, for the purpose of inserting anchor bars.

4. The underwater pile foundation reinforcement construction method according to claim 3, characterized in that, The anchor bars are arranged horizontally in a radial pattern, with the spacing between two adjacent anchor bars being 1 / 4 of the pile foundation perimeter, and perpendicular to the wall surface of the steel plate casing.

5. The underwater pile foundation reinforcement construction method according to claim 4, characterized in that, The diameter of the anchor bar is 20mm, and the depth of the anchor bar embedded in the anchor bar hole is 20cm.

6. The underwater pile foundation reinforcement construction method according to claim 1, characterized in that, In S4, the installation method of the steel plate casing includes: hoisting the steel plate casing segments one by one to the vicinity of the pile foundation, and connecting adjacent steel plate casing segments by transverse welding to form the steel plate casing.

7. The underwater pile foundation reinforcement construction method according to claim 6, characterized in that, After S4 and before S5, the procedure further includes: backfilling sand into the bottom gap between the steel plate casing and the pile foundation to perform backfilling and fixing treatment, so as to achieve a tight connection between the bottoms of the two.

8. The underwater pile foundation reinforcement construction method according to claim 1, characterized in that, In S5, the concrete is self-compacting underwater concrete with small aggregates with a particle size of no more than 20mm. The underwater concrete is poured using the tremie pipe method. During the pouring process, the concrete is poured diagonally at the same time, with the pouring speeds on both sides being matched. The slump and pouring height of the concrete are checked at any time.

9. The underwater pile foundation reinforcement construction method according to claim 6, characterized in that, The steel plate casing segment is formed by welding four steel plates on all four sides, and all welds are coated with anti-corrosion paint.

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