A dumbbell-shaped permanent and temporary underwater pier structure

Abstract

This utility model discloses a dumbbell-shaped permanent-temporary combined underwater pier structure, comprising: a dumbbell-shaped steel cofferdam set in the underwater stratum, the dumbbell-shaped steel cofferdam being formed by a plurality of interlocking steel pipe piles driven into the underwater stratum; a plurality of vertically spaced steel walers set on the inner side of the dumbbell-shaped steel cofferdam and located above the underwater pier; a connecting component set on the inner side of the dumbbell-shaped steel cofferdam and located at the casting position of the underwater pier; and a dumbbell-shaped underwater pier cast within the dumbbell-shaped steel cofferdam and located at the connection of the connecting component. This utility model reduces construction costs, improves construction efficiency, accelerates construction progress, and enhances the stability of the underwater structure.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic bridge engineering technology, and in particular to a dumbbell-shaped permanent and temporary combined underwater pier structure. Background Technology

[0002] In hydraulic structures such as bridges across rivers and seas, wharves, and tide gates, the underwater pier foundations typically employ a dry construction approach: "cofferdam first, foundation pit later." Current technology generally uses double-row steel sheet piles, lattice steel sheet piles, or steel caisson cofferdams to construct a temporary water-stopping system within the river (or sea area). Then, multiple layers of steel supports or concrete internal bracing are installed within the cofferdam to create a closed dry construction space before pile foundation and abutment construction. This method has the following significant drawbacks:

[0003] 1. Complex support system: The cofferdam requires steel walers, steel supports or concrete internal bracing to be erected layer by layer according to the excavation depth. The large number of components and the high installation accuracy requirements result in a long construction period and a significant increase in labor and material costs.

[0004] 2. Frequent overlap of work processes: Support installation and dismantling interfere with pile foundation and cap construction, limiting the work area, reducing efficiency, and posing significant safety risks due to the cross-operation of high-altitude and underwater operations.

[0005] 3. High difficulty in dismantling: The dismantling of the cofferdam and inner support must be carried out when the water level is low or after the bottom concrete has reached the required strength. The underwater cutting and hoisting operations are extensive and are prone to collision damage to the completed structure. In addition, the demolition waste needs to be transported off-site for disposal, resulting in significant environmental pressure.

[0006] 4. Low resource utilization: The steel sheet piles and internal bracing steel of the cofferdam are all one-time investments and cannot be converted into permanent load-bearing components. The material turnover rate is low and the overall cost is high.

[0007] 5. Limited adaptability: Traditional cofferdams are ineffective in preventing water leakage in complex water bodies with large tidal ranges, high flow velocities, undulating bedrock surfaces, or thick pebble layers. They are prone to leakage, uplift, or overturning, requiring additional reinforcement, which further increases costs and construction time.

[0008] Therefore, there is an urgent need to design a permanent and temporary underwater pier structure that combines the construction phase cofferdam pile foundation with the permanent pile foundation of the underwater pier, and minimizes the internal support system of the cofferdam during construction. This is an important direction for improving the construction efficiency of underwater pier foundations.

[0009] Therefore, through beneficial exploration and research, the applicant has found a solution to the above problems, and the technical solution to be introduced below is the result of this research. Utility Model Content

[0010] The technical problem to be solved by this utility model is to provide a dumbbell-shaped permanent and temporary combined underwater pier structure that reduces construction costs, improves construction efficiency, speeds up construction progress, and increases stability, in order to address the shortcomings of the existing technology.

[0011] The technical problem to be solved by this utility model can be achieved by the following technical solution:

[0012] A dumbbell-shaped permanent-temporary combined underwater pier structure includes:

[0013] A dumbbell-shaped steel cofferdam is set up in the underwater strata, and the dumbbell-shaped steel cofferdam is formed by a number of interlocking steel pipe piles driven into the underwater strata;

[0014] Several vertically spaced steel walers are set on the inner side of the dumbbell-shaped steel cofferdam and located above the pier in the water.

[0015] A connecting assembly is installed on the inner side of the dumbbell-shaped steel cofferdam and at the location of the underwater pier pouring; and

[0016] A dumbbell-shaped underwater pier cast within the dumbbell-shaped steel cofferdam and located where the connecting assembly is connected;

[0017] After the dumbbell-shaped underwater pier is poured, the portion of the dumbbell-shaped steel cofferdam above the top surface of the dumbbell-shaped underwater pier and the steel waler are removed.

[0018] In a preferred embodiment of this utility model, a sealing and waterproofing filler is provided in the cavity where the locking interfaces of two adjacent locking steel pipe piles interlock.

[0019] In a preferred embodiment of the present invention, the sealing and waterproofing filler includes a waterproof geomembrane bag and a low-strength micro-expansion slurry injected into the waterproof geomembrane bag.

[0020] In a preferred embodiment of the present invention, the steel waler includes a dumbbell-shaped steel beam and several pairs of support rods. The dumbbell-shaped steel beam is fixedly installed on the inner side of the dumbbell-shaped steel cofferdam by fasteners, and the several pairs of support rods are spaced apart in the middle long strip of the dumbbell-shaped steel beam.

[0021] In a preferred embodiment of this utility model, the distance between two adjacent steel walers is 0.5m to 1m.

[0022] In a preferred embodiment of this utility model, the connecting component includes:

[0023] A top moment plate is welded to the inner side of each locking steel pipe pile, and the top moment plate is provided with a number of upper connecting steel bars extending radially inward at intervals.

[0024] A bottom moment plate is welded to the inner side of each locking steel pipe pile and located below the top moment plate. The bottom moment plate is provided with a number of inwardly radially extending lower connecting steel bars at intervals.

[0025] A displacement plate welded to the inner side of each interlocking steel pipe pile and located between the top moment plate and the bottom moment plate, wherein a plurality of radially extending central connecting bars are spaced apart on the displacement plate; and

[0026] End bracing brackets welded to the inner side of each locking steel pipe pile and located below the bottom moment plate.

[0027] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: In the construction process, the interlocking steel pipe piles are used as cofferdams. After the construction is completed, the interlocking steel pipe piles above the top surface of the underwater pier are cut off, and the remaining interlocking steel pipe piles are retained as permanent pile foundations of the underwater pier, thereby reducing construction costs, improving construction efficiency, accelerating construction progress, and enhancing the stability of the underwater structure. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a three-dimensional structural schematic diagram of the dumbbell-shaped steel cofferdam of this utility model.

[0030] Figure 2 This is a plan view of the dumbbell-shaped steel cofferdam of this utility model.

[0031] Figure 3 This is a longitudinal cross-sectional view of the dumbbell-shaped steel cofferdam of this utility model.

[0032] Figure 4 This is a three-dimensional structural diagram of the dumbbell-shaped underwater pier of this utility model.

[0033] Figure 5 This is a schematic diagram of the connection of the locking steel pipe pile of this utility model.

[0034] Figure 6 This is a schematic diagram of the locking and water-stopping mechanism of the locking steel pipe pile of this utility model.

[0035] Figure 7 This is a schematic diagram of the connection between the interlocking steel pipe pile and the concrete of the underwater pier according to this utility model.

[0036] Figure 8This is a cross-sectional view of the connection between the interlocking steel pipe pile and the concrete of the underwater pier of this utility model. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0038] See Figures 1 to 4 The figure shows a dumbbell-shaped permanent and temporary combined underwater pier structure, including a dumbbell-shaped steel cofferdam 100, several steel walers 200, connecting components 300, and a dumbbell-shaped underwater pier 400.

[0039] The dumbbell-shaped steel cofferdam 100 is set in the water stratum and is formed by several interlocking steel pipe piles 110 driven into the water stratum.

[0040] The interlocking steel pipe pile 110 mainly achieves water sealing and blocking through the mechanical interlocking between the interlocks. Commonly used interlocking types include CO, CT, LT, and CC. In this embodiment, the CT type interlocking is used as an example; see [link to documentation]. Figure 5 It consists of a "C"-shaped female lock opening 111 and a "T"-shaped male lock opening 112. The "C"-shaped female lock opening 111 uses a round steel tube opening, and the "T"-shaped male lock opening 112 uses H-beams. In this embodiment, a sealing and waterproofing filler is provided in the cavity where the locking interfaces between the "C"-shaped female lock opening 111 and the "T"-shaped male lock opening 112 engage, such as... Figure 6 As shown. The sealing and waterproofing filler 113 includes a waterproof geomembrane bag and low-strength, micro-expansion slurry injected into the bag to enhance waterproofing performance. This waterproofing method is also applicable to various locking types such as CO, LT, and CC.

[0041] Several steel walers 200 are vertically spaced on the inner side of the dumbbell-shaped steel cofferdam 100 and located above the pier in the water. The distance between two adjacent steel walers 200 is 0.5m to 1m. In this embodiment, the steel walers 200 include dumbbell-shaped steel beams 210 and several pairs of support rods 220. The dumbbell-shaped steel beams 210 are fixedly installed on the inner side of the dumbbell-shaped steel cofferdam 100 by welding or bolting. The several pairs of support rods 220 are spaced apart in the middle elongated section of the dumbbell-shaped steel beams 210.

[0042] The two circular ends of the dumbbell-shaped steel cofferdam 100 are reinforced circumferentially with several steel walers 200. Due to the arch effect of the circle, the two circular ends do not need to be supported, which improves the utilization rate of construction space. Only the long strip in the middle is supported to ensure the structural stability during construction.

[0043] The dumbbell-shaped steel cofferdam 100 uses interlocking steel pipe piles, and its interior is reinforced with multiple steel walers 200 circumferentially. The bottom of the pit is reinforced with high-pressure jet grouting 120 for seepage prevention. Figure 3 As shown.

[0044] The connecting component 300 is located on the inner side of the dumbbell-shaped steel cofferdam 100 and at the location where the underwater pier is cast. See details... Figure 7 and Figure 8 The connecting assembly 300 includes a top moment plate 310, a bottom moment plate 320, a displacement plate 330, and an end bracing bracket 340. The top moment plate 310 is welded to the inner side of each interlocking steel pipe pile 110, and a plurality of inwardly extending upper connecting reinforcing bars 311 are spaced apart on the top moment plate 310. The bottom moment plate 320 is welded to the inner side of each interlocking steel pipe pile 110 and located below the top moment plate 310, and a plurality of inwardly extending lower connecting reinforcing bars 321 are spaced apart on the bottom moment plate 320. The displacement plate 330 is welded to the inner side of each interlocking steel pipe pile 110 and located between the top moment plate 310 and the bottom moment plate 320, and a plurality of inwardly extending middle connecting reinforcing bars 331 are spaced apart on the displacement plate 330. The end bracing bracket 340 is welded to the inner side of each locking steel pipe pile 110 and located below the bottom moment plate 320.

[0045] By welding a top moment plate 310, a bottom moment plate 320, a displacement plate 330, and an end brace 340 to the interlocked steel pipe pile 110, an effective connection between the interlocked steel pipe pile 110 and the concrete structure of the pier in the water is ensured. The top moment plate 310, the bottom moment plate 320, the displacement plate 330, and the end brace 340 are all steel structures, welded to the interlocked steel pipe pile 110, and connecting steel bars are welded to the top moment plate, the displacement plate, and the bottom moment plate to further strengthen the connection with the concrete of the pier in the water.

[0046] The dumbbell-shaped underwater pier 400 is cast within the dumbbell-shaped steel cofferdam 100 and connected by the connecting component 300. The planar shape of the dumbbell-shaped underwater pier 400 is the same as that of the dumbbell-shaped steel cofferdam 100, both being dumbbell-shaped. During the concrete pouring process of the underwater pier, the dumbbell-shaped steel cofferdam 100 and the dumbbell-shaped underwater pier 400 are cast as a whole through the connecting component 300. The interlocking steel pipe piles 110 surrounding the dumbbell-shaped underwater pier 400 are retained as permanent pile foundations of the underwater pier, and the excess part of the upper part of the interlocking steel pipe piles 110 is removed.

[0047] The construction method of the dumbbell-shaped permanent and temporary combined underwater pier structure of this utility model includes the following steps:

[0048] Step S10: According to the design drawings, use surveying instruments to accurately lay out the location of the interlocking steel pipe piles, drive the interlocking steel pipe piles 110 one by one into the water stratum, ensure that the interlocking connection between the interlocking steel pipe piles 110 is tight, and fill the cavity of the interlocking interface between two adjacent interlocking steel pipe piles 110 with low-strength micro-expansion mud slurry through a waterproof geotextile bag to form a closed and water-stopping dumbbell-shaped steel cofferdam 100.

[0049] Step S20: Install steel walers 200 one by one from top to bottom on the inner side of the dumbbell-shaped steel cofferdam 100. When the dumbbell-shaped steel cofferdam is deep and multiple steel walers need to be installed, first excavate the soil inside the dumbbell-shaped steel cofferdam and pump water down to about 0.5m below the steel waler, then install the dumbbell-shaped steel beam and support rods of that steel waler. After the construction of this steel waler is completed, continue to excavate the soil and pump water down to about 0.5m below the next steel waler, repeating the above steps until the last steel waler is installed.

[0050] Step S30: Within the dumbbell-shaped steel cofferdam, pour the underwater pier structure within the height range of the underwater pier concrete, so that the underwater pier structure and the connecting components set on the inner side of the dumbbell-shaped steel cofferdam are poured into a whole.

[0051] Step S40: Remove several steel walers and underwater cut off the part of the dumbbell-shaped steel cofferdam above the top surface of the underwater pier structure. The part of the dumbbell-shaped steel cofferdam below the top surface of the underwater pier structure is firmly integrated with the underwater pier structure and retained as a permanent pile foundation for the underwater pier.

[0052] This invention utilizes interlocking steel pipe piles as cofferdams during construction. After construction is completed, the interlocking steel pipe piles above the top surface of the underwater pier are removed, and the remaining interlocking steel pipe piles are retained as permanent pile foundations for the underwater pier. This reduces construction costs, improves construction efficiency, accelerates construction progress, and enhances the stability of the underwater structure.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dumbbell-shaped permanent-temporary combined underwater pier structure, characterized in that, include: A dumbbell-shaped steel cofferdam is set up in the underwater strata, and the dumbbell-shaped steel cofferdam is formed by a number of interlocking steel pipe piles driven into the underwater strata; Several vertically spaced steel walers are set on the inner side of the dumbbell-shaped steel cofferdam and located above the pier in the water. The connecting component is installed on the inner side of the dumbbell-shaped steel cofferdam and at the location of the underwater pier pouring position. as well as A dumbbell-shaped underwater pier cast within the dumbbell-shaped steel cofferdam and located where the connecting assembly is connected; After the dumbbell-shaped underwater pier is poured, the portion of the dumbbell-shaped steel cofferdam above the top surface of the dumbbell-shaped underwater pier and the steel waler are removed.

2. The dumbbell-shaped permanent-temporary combined underwater pier structure as described in claim 1, characterized in that, A sealing and waterproofing filler is installed in the cavity where the interlocking interfaces between two adjacent interlocking steel pipe piles are engaged.

3. The dumbbell-shaped permanent-temporary combined underwater pier structure as described in claim 2, characterized in that, The sealing and waterproofing filler includes a waterproof geomembrane bag and low-strength, micro-expansion slurry injected into the waterproof geomembrane bag.

4. The dumbbell-shaped permanent and temporary combined underwater pier structure as described in claim 1, characterized in that, The steel waler includes dumbbell-shaped steel beams and several pairs of support rods. The dumbbell-shaped steel beams are fixedly installed on the inner side of the dumbbell-shaped steel cofferdam by fasteners, and the several pairs of support rods are spaced apart in the middle long strip of the dumbbell-shaped steel beams.

5. The dumbbell-shaped permanent-temporary combined underwater pier structure as described in claim 4, characterized in that, The distance between two adjacent steel walers is 0.5m to 1m.

6. The dumbbell-shaped permanent-temporary combined underwater pier structure as described in any one of claims 1 to 5, characterized in that, The connection component includes: A top moment plate is welded to the inner side of each locking steel pipe pile, and the top moment plate is provided with a number of upper connecting steel bars extending radially inward at intervals. A bottom moment plate is welded to the inner side of each locking steel pipe pile and located below the top moment plate. The bottom moment plate is provided with a number of inwardly radially extending lower connecting steel bars at intervals. A displacement plate welded to the inner side of each interlocking steel pipe pile and located between the top moment plate and the bottom moment plate, wherein a plurality of radially extending central connecting bars are spaced apart on the displacement plate; and End bracing brackets welded to the inner side of each locking steel pipe pile and located below the bottom moment plate.

Images