An assembled reinforced concrete deep-water pier column and its horizontal installation method

Abstract

The present invention discloses a prefabricated reinforced concrete deep-water pier column and a horizontal installation method thereof. The pier column includes: a plurality of pier column segments, including a concrete main body and a steel reinforcement cage arranged therein. Stress-bearing steel bars are provided on the steel reinforcement cage, and the ends of the stress-bearing steel bars penetrate out of the concrete main body. A connecting sleeve hoop is arranged on the inner side of the ends of the stress-bearing steel bars; two adjacent connecting sleeve hoops are welded and fixed; the prestressing system includes: a pre-embedded pipe, and a pipe grouting system is communicated with the pre-embedded pipe; a notch is arranged at the end of the concrete main body, and the notch is connected with the end of the pre-embedded pipe; a prestressing tendon is arranged in the notch; an anchor is arranged in the notch, and the end of the prestressing tendon is connected with the anchor. In the present invention, the pier column can be prefabricated and assembled on land and then installed in a marine environment, realizing the rapid installation construction of the deep-water pier column, effectively solving the problems that the construction of the deep-water pier column is greatly affected by marine environmental factors, has poor economy and high safety risks.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly relates to a prefabricated reinforced concrete deep-water pier column and a horizontal installation method thereof. Background Art

[0002] A pier column is a building that supports the bridge span structure and transmits the dead load and vehicle live load to the foundation, and is usually set between two abutments. The materials for building pier columns can be wood, stone, concrete, reinforced concrete, steel, etc.

[0003] In the conventional environment, the stress condition of the pier column structure is mainly small eccentric compression, but in the deep-water environment of the ocean, the stress condition of the pier column structure usually has the situation of large eccentric compression. In this case, the ordinary reinforced concrete structure is prone to micro-cracks, which causes seawater intrusion, resulting in steel corrosion and low durability of the reinforced concrete structure. The steel structure pier column may have problems of fatigue and poor stability under the action of periodic wave flow force, accidental ship collision force, seismic force and other loads, and is also vulnerable to corrosion in the marine environment. Its main protection measure, the cathodic protection method, will continuously generate costs, and the total protection cost in the whole life cycle is high.

[0004] At the same time, as a vertical structure, the pier column generally adopts the bottom-up vertical construction method. When the vertical construction method is used for the construction of the pier column in water, it is divided into two types: the cut-off cofferdam construction method and the floating connection and sinking method.

[0005] The cut-off cofferdam construction method is the most commonly used one. It arranges cut-off cofferdams around the pier column, drains the water in the cofferdams, and constructs the pier column in a dry environment. After the underwater part of the pier column is constructed, the cut-off cofferdams are removed and recycled. The disadvantages of this construction method are as follows: the cost of the cut-off cofferdam facilities increases sharply with the increase of water depth. When it is used for the construction of deep-water pier columns, the economy of the construction method is poor; when it is used in the marine environment with short effective operation time, there are also problems of long construction period and high safety risk.

[0006] The floating connection and sinking method is a new method proposed in Chinese invention patent CN110761192A, which is applicable to the construction of pier columns with self-floating ability in deep-water environments. It is similar to the construction method of the floating caisson foundation, and is a construction method of successively connecting and raising the pier column above the water surface and filling and sinking it in place. However, the disadvantages of the above construction method are as follows: the water surface hoisting and splicing construction of the prefabricated segments of the pier column requires large-scale lifting equipment; the on-site splicing workload is large and the construction period is long; affected by environmental factors, the quality of segment splicing lacks guarantee; the mooring cost during the connection and sinking process of the pier column is high under the influence of environmental loads such as water flow and wind waves, and the safety risk is large.

[0007] In view of this, there is an urgent need to improve the existing reinforced concrete deep-water pier columns and their construction methods, so as to improve the durability and service life of the reinforced concrete deep-water pier columns, reduce the construction cost of the reinforced concrete deep-water pier columns, and improve the construction quality and construction safety. Summary of the Invention

[0008] Aiming at the above defects, the purpose of the present invention is to provide a prefabricated reinforced concrete deep-water pier column and its horizontal installation method, so as to solve the problems of poor durability and short service life of the existing reinforced concrete deep-water pier columns, high construction cost of the reinforced concrete deep-water pier columns, and great influence of the construction quality and construction safety by the environment.

[0009] To this end, a prefabricated reinforced concrete deep-water pier column provided by the present invention includes:

[0010] A plurality of pier column segments, including a concrete main body and a steel reinforcement cage arranged in the concrete main body. Stress-bearing steel bars are provided on the steel reinforcement cage, and the ends of the stress-bearing steel bars penetrate out of the concrete main body. A connecting collar is arranged on the inner side of the ends of the stress-bearing steel bars; two adjacent connecting collars are welded and fixed;

[0011] A prestressing system, including:

[0012] Embedded pipes are arranged in the concrete main body, and a pipe grouting system is communicated with the embedded pipes;

[0013] Notches are arranged at the ends of the concrete main body, and the notches are connected to the ends of the embedded pipes; prestressing tendons are arranged in the notches;

[0014] Anchors are arranged in the notches, and the ends of the prestressing tendons are connected to the anchors.

[0015] In the above technical solution, preferably, a joint leveling and protection structure is further provided on the joints of two adjacent connecting collars. The joint leveling and protection structure includes:

[0016] A weld leveling layer is arranged on the connecting end faces of two adjacent connecting collars for leveling the welds;

[0017] A weld protection layer is arranged on the outer side surface of the connecting collar, and the weld protection layer is connected to the concrete main bodies on both sides of the joint.

[0018] In the above technical solution, preferably, the length of the prestressing tendon is greater than the length of the concrete main body of one pier column segment, and the end of the prestressing tendon axially penetrates at least one cross-section where the weld of the connecting collar is located along the concrete main body and is connected to the anchor.

[0019] In the above technical solution, preferably, the bottom end of the pier segment located at the bottom of the pier column includes a bottom end sealing plate;

[0020] The top end of the pier segment located at the top of the pier column includes a top end sealing plate, and the top end sealing plate is provided with a water injection hole.

[0021] A horizontal installation method for an assembled reinforced concrete deep-water pier column includes the following steps:

[0022] Precast pier segments on land, transfer the pier segments to the transfer trolley, and assemble the pier columns on the transfer trolley into a pier column;

[0023] Dock the transfer barge at the wharf, and use the sliding track and the towing winch to transfer the transfer trolley and the pier column to the transfer barge, and temporarily seal the water injection hole on the top end sealing plate of the pier column;

[0024] Transfer the transfer trolley and the pier column to the sea area near the pier position through the transfer barge, inject water into the ballast tank of the transfer barge to tilt the rear end of the transfer barge; push the pier column and the transfer trolley into the sea, and the pier column floats on the sea surface by itself. The transfer trolley is separated from the pier column, and the transfer trolley is recovered to the transfer barge;

[0025] Drag the pier column to the designed pier position, adjust the attitude of the pier column so that the top end of the pier column is higher than the bottom end of the pier column; open the water injection hole on the top end sealing plate of the pier column, and inject water into the pier column through the water injection hole until the pier column is close to an upright attitude;

[0026] Straighten the pier column, construct the pier column foundation, and fix the pier column on the pier column foundation at the designed pier position.

[0027] In the above technical solution, preferably, before precasting pier segments on land, it includes the following steps:

[0028] Select a land prefabrication and splicing site for the pier column, construct prefabrication equipment, splicing equipment and transfer equipment. The splicing equipment is a splicing bracket, and the transfer equipment includes a sliding track, a transfer trolley and a shipping wharf;

[0029] In the above technical solution, preferably, the land prefabrication and splicing site for the pier column is provided with a ramp, the sliding track is arranged on the ramp, the lower end of the sliding track is connected to the shipping wharf, and is perpendicularly arranged to the shipping wharf;

[0030] The splicing bracket is arranged on the transfer trolley and is fixedly connected to the transfer trolley;

[0031] The transfer trolley is arranged on the sliding track and is detachably connected to the sliding track through a temporary fixing device.

[0032] In the above technical solution, preferably, splicing pier column segments into a bridge pier column includes the following steps:

[0033] Precast pier column segments in a vertical manner. After the precast of the pier column segments is completed, turn them into a horizontal position and transport them to the splicing support.

[0034] Perform the splicing between adjacent pier column segments and the construction of the prestressing system on the assembly support.

[0035] Repeat the above steps until the horizontal assembly construction of the bridge pier column is completed.

[0036] In the above technical solution, preferably, jacks arranged along the sliding track are provided on the sliding track. The jacks cooperate with the towing winch to transfer the transport trolley and the bridge pier column to the transfer barge.

[0037] In the above technical solution, preferably, straighten the bridge pier column, construct the foundation of the bridge pier column, and fix the bridge pier column on the foundation of the bridge pier column at the designed pier position, including the following steps:

[0038] Use a floating crane to lift the top of the bridge pier column and continue to inject water into the bridge pier column.

[0039] Use the floating crane and mooring cables to adjust the bottom of the bridge pier column to the designed pier position, and the floating crane releases the hook to make the bridge pier column seat on the bottom.

[0040] Use the floating crane and mooring cables to straighten the bridge pier column, construct the foundation of the bridge pier column, and fix the bridge pier column on the seabed foundation at the designed pier position.

[0041] It can be seen from the above technical solution that the prefabricated reinforced concrete deep-water bridge pier column and its horizontal installation method provided by the present invention are used for bridge construction in the deep-sea environment. Compared with the prior art, the present invention has the following beneficial effects:

[0042] Firstly, for the prefabricated reinforced concrete deep-water bridge pier column provided by the present invention, the bridge pier column adopts a fully prestressed structure, and the reinforced concrete structure of the bridge pier column is always in a compressed state and will not crack, so that the bridge pier column has good durability in the seawater environment; there is no exposed steel structure in the reinforced concrete structure of the bridge pier column, which greatly reduces the maintenance cost of rust prevention of the bridge pier column.

[0043] Secondly, for the horizontal installation method of the prefabricated reinforced concrete deep-water bridge pier column provided by the present invention, the prefabrication and splicing of the bridge pier column segments are both completed in the land environment, which is convenient for large-scale industrial production of the bridge pier column segments, greatly reduces the manufacturing cost of the bridge section. At the same time, the land production environment is not easily affected by environmental loads such as water flow and wind waves in the marine environment, and has the advantages of good detection conditions, guaranteed product quality in production, and long construction period.

[0044] Finally, for the horizontal installation method of the prefabricated reinforced concrete deep-water pier column provided by the present invention, a barge is used to transport the pier column as a whole to the vicinity of the pier position, and the overall rotation construction and installation of the pier column are carried out by utilizing the buoyancy at sea, an offshore floating crane and a mooring system, which simplifies the construction steps of the deep-water pier column at sea, eliminates the need for on-site casting and assembly construction at sea, greatly shortens the duration of offshore operations, and reduces the costs and safety risks of offshore operations. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce and explain the drawings required for the description of the embodiments of the present invention or the prior art. Obviously, the drawings in the following description are only partial embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0046] Figure 1 It is a schematic structural diagram of the prefabricated reinforced concrete deep-water pier in the present invention;

[0047] Figure 2 It is a schematic cross-sectional view of the pier column section of the prefabricated reinforced concrete deep-water pier column in the present invention;

[0048] Figure 3 It is a schematic horizontal assembly diagram of the pier column of the prefabricated reinforced concrete deep-water pier in the present invention;

[0049] Figure 4 It is a schematic diagram of the movement, towing and sliding launch of the pier barge in the present invention;

[0050] Figure 5 It is a schematic diagram of the self-floating rotation installation of the pier in the present invention;

[0051] Figure 6 It is a schematic diagram of the bottom fixing installation of the pier in the present invention.

[0052] Figure 1-6 In, the corresponding relationship between the components and the reference numerals is as follows:

[0053] Pier column 11, caisson 12, pier foundation 13,

[0054] Pier column section 2, concrete main body 21, stress-bearing steel bars 22, connecting hoops 23, embedded pipes 24, notch 25, water injection hole 27, water injection pipe 28,

[0055] Land prefabrication and splicing yard 31 for the pier column of the pier, splicing bracket 32, sliding track 33, transport trolley 34, ramp 35, transfer barge 36, pier column section 37 to be spliced, pier column section 38 that has completed splicing, deck slideway 39. Detailed implementation manners

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0057] The implementation principle of the present invention is as follows:

[0058] By arranging a prestress system in the pier column section of a reinforced concrete pier, the pier column sections are spliced into a pier column on land, and a full prestress structure is formed in the pier column, so that the reinforced concrete pier column is always in a compressed state, thereby avoiding cracking in a seawater environment.

[0059] When installing the pier column, the closed pier column is carried by a transportation platform, transferred from the wharf to a transfer barge through a sliding track, and then the pier column is transferred to the designed pier position by the transfer barge. The attitude of the transfer barge is adjusted to make the pier column slide into the water, so that it floats on the water surface by its own buoyancy; water is injected into the pier column through the water injection hole on the pier column, and the pier column is straightened by using a floating crane and the buoyancy of the pier column itself, and the straightened pier column is fixed on the pier column foundation.

[0060] The solution provided by the present invention can complete the installation of deep-water pier columns in a marine environment, realize the rapid installation construction of deep-water pier columns, and effectively solve the problems that the construction of deep-water pier columns is greatly affected by marine environmental factors, the construction economy is poor, and the safety risk is high.

[0061] Specifically, the prefabricated reinforced concrete deep-water pier column provided by the present invention includes:

[0062] A plurality of pier column sections, including a concrete main body and a steel reinforcement cage arranged in the concrete main body. Stress-bearing steel bars are provided on the steel reinforcement cage, and the ends of the stress-bearing steel bars penetrate out of the concrete main body, and connecting sleeve hoops are arranged on the inner sides of the ends of the stress-bearing steel bars; two adjacent connecting sleeve hoops are welded and fixed;

[0063] A prestress system, including:

[0064] Embedded pipes, arranged in the concrete main body, and a pipe grouting system is communicated with the embedded pipes;

[0065] Notches, arranged at the ends of the concrete main body, the notches are connected with the ends of the embedded pipes; prestressing tendons are arranged in the notches;

[0066] The anchor is arranged within the notch, and the end of the prestressed tendon is connected to the anchor.

[0067] To more clearly explain and illustrate the technical solution and implementation manner of the present invention, several preferred specific embodiments for implementing the technical solution of the present invention are introduced below.

[0068] It should be noted that when an element is referred to as "fixed to" or "arranged on" another element, it can be directly on the other element or indirectly arranged on the other element; when an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0069] In addition, the terms "inner, outer", "front, back", "left, right", "vertical, horizontal", "top, bottom", etc. in this article indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0070] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0071] Specific Embodiment 1.

[0072] Please refer to Figure 1 , the Figure 1 is a schematic structural view of the precast reinforced concrete deep - water bridge pier column of this embodiment.

[0073] As Figure 1 shown, the deep - water bridge pier includes a pier column 11, a caisson 12, and a bridge pier foundation 13. The precast reinforced concrete deep - water bridge pier column 11 provided by the present invention is composed of a plurality of pier column segments 2 spliced together, and a prestressing system is arranged within the pier column segment 2.

[0074] The pier column segment 2 includes a concrete main body 21 and a steel reinforcement cage arranged within the concrete main body. The steel reinforcement cage is composed of stress - bearing steel bars 22 and structural steel bars. The end of the stress - bearing steel bar 22 penetrates out of the concrete main body 21, and a connecting collar 23 is arranged inside the end of the stress - bearing steel bar 22. Two adjacent connecting collars 23 are welded and fixed.

[0075] The prestressing system includes embedded ducts 24, notches 25 and anchor devices. The embedded ducts 24 are arranged within the concrete body 21 and are completely wrapped by the concrete. The duct grouting system is in communication with the embedded ducts 24 and is used for grouting the ducts. The notches 25 are arranged at the ends of the concrete body 21, and the notches 25 are connected to the ends of the embedded ducts 24. Prestressing tendons are provided within the notches 25, the anchor devices are arranged within the notches 25, and the ends of the prestressing tendons are connected to the anchor devices. Among them, the length of the prestressing tendons is greater than the length of the concrete body 21 of the pier segment 2, and the ends of the prestressing tendons axially pass through at least one cross-section where the weld of the connecting collar 23 is located along the concrete body 21 and are connected to the anchor devices.

[0076] The bottom end of the pier segment located at the bottom of the pier column of the bridge pier includes a bottom sealing plate; the top end of the pier segment located at the top of the pier column of the bridge pier includes a top sealing plate, and a water injection hole is provided on the top sealing plate, and water can be injected into the bridge pier column 11 through the water injection hole.

[0077] The bridge pier column 11 is spliced by a plurality of pier segments 2. The pier segments 2 can be prefabricated on land and then spliced, eliminating the need for offshore casting operations of the bridge pier, greatly shortening the duration of offshore operations, and at the same time avoiding the influence of the offshore operation environment factors on the quality of the bridge pier column, having good quality assurance and economic benefits; a prestressing system is provided within the bridge pier column 11, and through the prestressing system, the bridge pier column is kept in a compressed state, avoiding cracking of the reinforced concrete structure of the pier column, thereby enabling it to have high durability and greatly reducing the maintenance cost of the bridge pier column.

[0078] Specific embodiment 2.

[0079] This specific embodiment 2 is a further optimization and improvement of the bridge pier column 11 in specific embodiment 1.

[0080] A joint leveling and protection structure is further provided on the joint of two adjacent connecting collars 23 on the bridge pier column 11. The joint leveling and protection structure includes a joint leveling layer and a weld protection layer. The joint leveling layer is arranged on the connecting end faces of two adjacent connecting collars 23 and is used for leveling the gaps on the connecting end faces of the two connecting collars 23, eliminating air bubbles and holes in the weld, and improving the strength of the weld; the weld protection layer is arranged on the outer side surface of the connecting collar 23, and the weld protection layer is connected to the concrete body on both sides of the joint, so that the weld protection layer covers the outer side surface of the connecting collar 23, and there is no exposed steel structure on the side surface of the bridge pier column 11 for the connecting collar 23 and the weld, so as to avoid the exposure of the connecting collar 23 and corrosion by seawater.

[0081] The unevenness of the weld surface is avoided through the joint leveling layer, and through the weld protection layer, the weld is hidden within the weld protection layer, so that there is no exposed steel structure in the reinforced concrete structure of the bridge pier column, greatly reducing the maintenance cost of the bridge pier column for anti-corrosion.

[0082] Specific Embodiment 3

[0083] The present invention also provides a horizontal installation method for a fabricated reinforced concrete deep - water pier column, comprising the following steps:

[0084] S1. Prefabricate pier column segments on land, transfer the pier column segments to a transport trolley, and splice the pier column segments on the transport trolley to form a pier column;

[0085] Before prefabricating pier column segments on land, it is necessary to select a land prefabrication and splicing site 31 for the pier column, construct prefabrication equipment, splicing equipment and transport equipment. The splicing equipment is a splicing support 32, and the splicing of pier column segments can be carried out on the splicing support 32. The transport equipment includes a sliding track 33, a transport trolley 34 and a shipping dock.

[0086] The land prefabrication and splicing site 31 for the pier column is provided with a ramp 35. The sliding track 33 is arranged on the ramp 35. The lower end of the sliding track 33 is connected to the shipping dock and is vertically arranged with the shipping dock, in a T - shape, so as to facilitate the transport trolley 34 to transfer the pier column 11 to the transfer barge 36. The splicing support 32 is arranged on the transport trolley 34 and is fixedly connected to the transport trolley 34. The transport trolley 34 is arranged on the sliding track 33 and is detachably connected to the sliding track 33 through a temporary fixing device.

[0087] Splicing the pier column segments into a pier column includes the following steps:

[0088] S11. Prefabricate the pier column segments in a vertical manner. After the pier column segments are prefabricated, turn them into a horizontal position and transport them to the splicing support 32;

[0089] S12. Carry out the splicing between adjacent pier column segments and the construction of the prestressing system on the splicing support 32;

[0090] As Figure 3 shown, after each pier column segment is prefabricated, it can be transported to the splicing support 32. Splice the pier column segment 37 to be spliced with the pier column segment 38 that has been spliced on the splicing support 32, so as to realize the simultaneous prefabrication and splicing of the pier column segments and improve the construction efficiency of the pier column.

[0091] S13. Repeat the above steps until the horizontal assembly construction of the pier column 11 is completed.

[0092] S2. Dock the transfer barge 36 at the dock, use the sliding track 33 and a towing winch to transfer the transport trolley 34 and the pier column 11 to the transfer barge 36, and temporarily seal the water injection holes on the top cover plate of the pier column 11;

[0093] Specifically, after the transfer barge 36 docks at the wharf, connect the barge mooring cable, and connect the end of the sliding track 33 to the top deck slideway 39 of the transfer barge 36 to form a transfer channel for the transfer trolley 34.

[0094] Jacks are arranged along the sliding track 33 on the sliding track 33. The jacks cooperate with the towing winch to transfer the transfer trolley and the pier column to the transfer barge. After the towing winch is in place, connect the steel wire rope of the towing winch to the transfer trolley 34, release the temporary consolidation between the transfer trolley 34 and the sliding track 33, and with the help of the towing winch and the jacks arranged along the sliding track 33, move the transfer trolley 34 and the pier column 11 to the transfer barge 36.

[0095] S3. Transfer the transfer trolley 34 and the pier column 11 to the sea area near the pier position through the transfer barge 36. Inject water into the ballast tank of the transfer barge 36 to make the rear end of the transfer barge 36 tilt; push the pier column 11 and the transfer trolley 34 into the sea. The pier column 11 floats on the sea surface by itself, the transfer trolley 34 is separated from the pier column 11, and the transfer trolley 34 is recovered to the transfer barge 36;

[0096] Specifically, as Figure 4 shown, connect the trolley mooring cable to the transfer trolley 43, connect the pier mooring cable to the pier column 11, inject water into the ballast tank of the transfer barge 36 to make the transfer barge 36 tilt backward by a certain angle. Release the temporary connection between the transfer trolley 34 and the transfer barge 36, inject water into the water tank of the transfer barge 36 to make the transfer barge 41 continue to tilt backward; at the same time, with the help of the mooring cable and the jacks arranged along the deck slideway 39, make the pier column 11 and the transfer trolley 34 slide into the sea along the deck slideway 39 together. The pier column 11 floats on the sea surface by itself, the transfer trolley 34 is separated from the pier column 11, and the transfer trolley 34 is recovered to the deck of the transfer barge 36 by a floating crane, and the transfer barge 36 returns.

[0097] S4. As Figure 5 shown, drag the pier column 11 to the designed pier position, adjust the attitude of the pier column 11 so that the top end of the pier column 11 is higher than the bottom end of the pier column 11; open the water injection hole 27 of the top sealing plate of the pier column 11, and inject water into the water injection hole 27 of the pier column 11 through the water injection pipe 28 until the pier column 11 is close to an upright posture;

[0098] S5. Straighten the pier column 11, construct the pier column foundation 13, and fix the pier column 11 on the pier column foundation 13 at the designed pier position.

[0099] Specifically, as Figure 6 shown, it includes the following steps:

[0100] S51. Use a floating crane to lift the top of the pier column 11 and continue to inject water into the pier column 11;

[0101] S52. Use a floating crane and mooring cables to adjust the bottom of the pier column 11 to the designed pier position, and the floating crane releases the hook to seat the pier column 11;

[0102] S53. Use a floating crane and mooring cables to straighten the pier column 11, construct the pier column foundation 13, and fix the pier column 11 on the seabed foundation at the designed pier position.

[0103] In the present invention, pier column segments are prefabricated on a land prefabrication and splicing site, and the pier column segments are spliced into a pier column, avoiding the offshore casting of the pier column, thus solving the problem of unstable quality of deep - sea pier columns. At the same time, the cost of the pier column does not increase sharply with the increase of water depth, solving the problem of poor economy in the construction of the above - mentioned piers. At the same time, the construction period and construction safety of on - land construction are less affected by the marine environment, greatly shortening the construction period and improving the construction efficiency.

[0104] The pier column adopts horizontal splicing, and is transferred to a transfer barge through transporting equipment such as transfer trolleys and sliding tracks. Through the inclination of the transfer barge in the sea area where the pier bridge is set, and using the self - buoyancy of the pier column, the pier column is straightened and installed, greatly reducing the installation difficulty of the pier column, reducing the time and workload of offshore operations during the construction process of the pier column, and improving the construction efficiency.

[0105] Finally, it should also be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions that can be implemented in this application. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in this application.

[0106] The term "comprising" used herein, "including" or any other variant thereof is intended to cover non - exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0107] The present invention is not limited to the above-described best embodiments. Anyone should be aware that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

Claims

1. An assembled prestressed reinforced concrete deep-water pier column, characterized in that, Comprising: A plurality of pier column segments, including a concrete main body and a steel reinforcement cage disposed within the concrete main body. Stress-bearing steel bars are provided on the steel reinforcement cage, and the ends of the stress-bearing steel bars penetrate through the concrete main body. A connecting collar is provided inside the ends of the stress-bearing steel bars; two adjacent connecting collars are welded and fixed; the pier column segment is a variable cross-section structure that is narrower at the top and wider at the bottom; A prestressing system, comprising: Embedded pipes, disposed within the concrete main body, and a pipe grouting system is in communication with the embedded pipes; Notches, disposed at the ends of the concrete main body, and the notches are connected to the ends of the embedded pipes; prestressing tendons are provided within the notches; Anchors, disposed within the notches, and the ends of the prestressing tendons are connected to the anchors; A joint leveling and protection structure is further provided on the joints of two adjacent connecting collars, and the joint leveling and protection structure comprises: A joint leveling layer, disposed on the connecting end faces of two adjacent connecting collars, for leveling the welds; A weld protection layer, disposed on the outer side surfaces of the connecting collars, and the weld protection layer is connected to the concrete main bodies on both sides of the joint; The length of the prestressing tendon is greater than the length of the concrete main body of one pier column segment, and the end of the prestressing tendon axially penetrates at least through the cross-section where the weld of one connecting collar is located along the concrete main body and is connected to the anchor.

2. The prefabricated prestressed reinforced concrete deep-water pier column according to claim 1, wherein, The bottom end of the pier column segment located at the bottom of the bridge pier column includes a bottom end closing plate; The top end of the pier column segment located at the top of the bridge pier column includes a top end closing plate, and a water injection hole is provided on the top end closing plate.

3. A horizontal installation method for the pier column of an assembled prestressed concrete steel deep-water pier, characterized in that, Including the following steps: Precast pier column segments on land, transfer the pier column segments to a transport trolley, and splice the pier column segments on the transport trolley into a bridge pier column; Dock a transfer barge at the dock, and use a sliding track and a towing winch to transfer the transport trolley and the bridge pier column to the transfer barge, and temporarily seal the water injection hole on the top end closing plate of the bridge pier column; Transfer the transport trolley and the bridge pier column to the sea area near the pier position by the transfer barge, inject water into the ballast tank of the transfer barge to make the rear end of the transfer barge tilt; push the bridge pier column and the transport trolley into the sea, and the bridge pier column floats on the sea surface by itself. The transport trolley is separated from the bridge pier column, and the transport trolley is recovered to the transfer barge; Drag the bridge pier column to the designed pier position, adjust the attitude of the bridge pier column so that the top end of the bridge pier column is higher than the bottom end of the bridge pier column; open the water injection hole on the top end closing plate of the bridge pier column, and inject water into the bridge pier column through the water injection hole until the bridge pier column is close to an upright attitude; Straighten the bridge pier column, construct the foundation of the bridge pier column, and fix the bridge pier column on the foundation of the bridge pier column at the designed pier position; Before precasting pier column segments on land, including the following steps: Select a land prefabrication and splicing site for the bridge pier column, construct prefabrication equipment, splicing equipment, and transport equipment. The splicing equipment is a splicing support, and the transport equipment includes a sliding track, a transport trolley, and a shipping dock; Splice the pier column segments into a bridge pier column, including the following steps: Prefabricate the pier column segments in a vertical manner, and after the pier column segments are prefabricated, turn them into a horizontal position and transport them to the splicing support; Perform the splicing between adjacent pier column segments and the construction of the prestressing system on the assembling support. Repeat the above steps until the horizontal assembly construction of the pier columns is completed.

4. The horizontal installation method of the prefabricated prestressed concrete steel deep-water pier column according to claim 3, characterized in that, The onshore prefabrication and splicing yard for the pier columns is provided with a ramp, and the sliding track is arranged on the ramp. The lower end of the sliding track is connected to the shipping dock and is vertically arranged with the shipping dock. The splicing support is arranged on the transporter trolley and is fixedly connected to the transporter trolley. The transporter trolley is arranged on the sliding track and is detachably connected to the sliding track through a temporary fixing device.

5. The horizontal installation method of the prefabricated prestressed concrete steel deep-water pier column according to claim 4, characterized in that, The sliding track is provided with jacks arranged along the sliding track. The jacks cooperate with the towing winch to transfer the transporter trolley and the pier columns to the transfer barge.

6. The horizontal installation method of the prefabricated prestressed concrete steel deep-water pier column according to claim 3, characterized in that, Straighten the pier columns, construct the pier column foundation, and fix the pier columns on the pier column foundation at the designed pier position, including the following steps: Use a floating crane to lift the top of the pier column and continue to inject water into the pier column. Use the floating crane and mooring cables to adjust the bottom of the pier column to the designed pier position, and the floating crane releases the hook to make the pier column seat on the bottom. Use the floating crane and mooring cables to straighten the pier column, construct the pier column foundation, and fix the pier column on the seabed foundation at the designed pier position.

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