Construction method for steel beam sliding support beside tower pier of cross-sea bridge in main waterway

Abstract

The invention relates to the field of bridge construction, and discloses a main channel cross-sea bridge tower pier side steel beam sliding support construction method which comprises the following steps that a guide beam set and two steel box beams are assembled on an assembling support through a crawler crane on a trestle, and a beam erecting crane is assembled on the assembled steel box beams; hoisting the steel box girder to the sliding bracket by using a floating crane, dragging the steel box girder to a designed position along the sliding bracket, and hoisting the suspended splicing steel box girder by using a girder erection crane until the erection of the side span steel girder frame is completed; by using the slideway beam as the upper part bearing structure of the sliding bracket, the traditional structure adopting a plurality of groups of bailey trusses as a bearing system is changed, and meanwhile, a distribution beam structure arranged above the bailey trusses is also omitted, so that the layer number of the upper part structural beams of the sliding bracket is reduced, the structural design of the sliding bracket is simplified, and the construction cost is reduced. In addition, the gravity center of the sliding support is lowered, and a supporting foundation is provided for stable sliding of the steel beam.

Description

Technical Field

[0001] The invention relates to the field of bridge construction, and in particular to a construction method of a steel beam sliding bracket beside a tower pier of a main channel sea-crossing bridge. Background Art

[0002] Bridge engineering has occupied a considerable proportion in municipal infrastructure in recent years. Steel beams are increasingly used in today's bridge design, especially in large-span bridges, due to their advantages such as light weight, high strength and wide applicability. In the installation and construction of steel beam bridges, if the construction conditions are met, it is the preferred method to directly hoist the steel beam segments to the designed bridge position at one time. However, in many cases, this cannot be done due to restrictions such as terrain and construction equipment. In such cases, the general method is to first slide the steel beam into place in sections using a sliding device. The bottom plate of the sliding device is usually equipped with a corresponding sliding bracket system for support.

[0003] Most existing sliding support systems use Bailey frames as the main load-bearing system of the support. However, there are many disadvantages in using Bailey frames as the main load-bearing system. Due to the poor shear resistance of Bailey frames, multiple sets of Bailey frames need to be set under the single-sided slide. In order to evenly transfer the local support reaction force during the sliding of the steel beam to the multiple sets of Bailey frames, distribution beams need to be set above the Bailey frames to distribute and transfer the local force. The traditional sliding support system includes at least columns, load-bearing beams, Bailey beams, distribution beams and slides from bottom to top. Among them, the columns need to be driven into the seabed and their height is almost the same as that of the bridge. Then the corresponding load-bearing beams, Bailey beams, distribution beams and slides are installed on the columns. Such a multi-layer structure leads to a higher center of gravity of the sliding support. If the center of gravity of the sliding support is too high, the stability of the sliding support will be reduced, which is not conducive to smooth sliding and will also affect construction safety. Summary of the invention

[0004] The purpose of the present invention is to provide a method for constructing a steel beam sliding bracket beside a tower pier of a main channel cross-sea bridge to solve the problem that the traditional sliding bracket system has a relatively complex overall structure, resulting in a higher center of gravity of the sliding bracket, thereby reducing the stability of the sliding bracket and being unfavorable for smooth sliding. The specific technical solution is as follows:

[0005] A method for constructing a steel beam sliding support beside a tower pier of a main channel cross-sea bridge comprises the following steps:

[0006] S1. Set up temporary piers on the planned construction path of the bridge, and set up sliding supports between the side piers and the temporary piers;

[0007] S2. Install the jacking equipment on the temporary pier and set up the assembly bracket on the jacking equipment;

[0008] S3, using the crawler crane on the trestle to assemble the guide beam group and two sections of steel box beams on the assembly bracket, and assembling the beam erection crane on the assembled steel box beam;

[0009] S4. Use a floating crane to lift the steel box girder onto the sliding bracket, drag the steel box girder along the sliding bracket to the designed position, and then use a beam erection crane to hoist the suspended steel box girder until the side span steel beam frame is erected;

[0010] S5. Use a vertical jack to lift the steel box girder on the assembling bracket, remove the jacking equipment, assembling bracket and sliding bracket, and then lower the steel box girder and connect it to the side span steel beam frame;

[0011] S6. Use the cantilever of the beam erection crane to assemble the steel beam frame on the middle span side. Divide the steel beam frame on the middle span side into multiple sections for construction. After each steel beam section is erected, the inclined cables are symmetrically hung until the steel beam frame on the middle span side is erected to the joint section in the middle of the span.

[0012] S7. The cable-stayed cable is set on the top surface of the steel box girder and a cable-laying channel is set along the direction of the bridge. The tower crane and the bridge deck truck crane cooperate with the cable-laying and hanging;

[0013] S8. After the steel beams are connected, pour weighted concrete into the steel beam box on the temporary pier top, construct the concrete slag retaining wall, and adjust the cables of the entire bridge.

[0014] Preferably, in S1, a pier-side bracket is provided beside the side pier or temporary pier, a sliding bracket is provided on the pier-side bracket, a sliding seat slidably matched therewith is provided on the slideway, and limiting devices are provided on both sides of the slideway.

[0015] Preferably, in S2, the temporary pier serves as the middle support point of the steel box girder, and the height of the temporary pier is 19.5 to 45.4 meters.

[0016] Preferably, in S2, the assembled support includes a plurality of steel pipe columns and a plurality of pile foundations, the plurality of pile foundations are installed on the seabed surface, the plurality of steel pipe columns correspond to and are connected to the plurality of pile foundations one by one, and support rods are connected between the plurality of steel pipe columns to form a truss structure.

[0017] Preferably, in S1, the sliding bracket includes a distribution beam, the distribution beam is connected to the top of the steel pipe column, a slide beam is arranged on the distribution beam, the slide beam is a box beam, and the slide seat is slidably connected to the slide beam.

[0018] Preferably, webs are provided on opposite sides of the steel box girder, and the guide beam assembly is connected to the webs.

[0019] Preferably, the guide beam group includes 6 longitudinal guide beams and 2 transverse guide beams, and the longitudinal guide beams and the transverse guide beams are cross-connected.

[0020] Preferably, a steel beam sliding system is arranged on the sliding bracket, and the steel beam sliding system comprises a through-type horizontal continuous jack, a jack reaction seat and a steel strand, the steel strand is connected to the through-type horizontal continuous jack, the slider is connected to the steel strand, and the through-type horizontal continuous jack is connected to the jack reaction seat.

[0021] Preferably, a connecting embedded part is provided inside the steel pipe column, and the steel pipe column is connected to the pile foundation through the connecting embedded part.

[0022] Beneficial effects of the present invention:

[0023] (1) In the sliding bracket of the present invention, the slide beam is used as the upper load-bearing structure of the sliding bracket, which changes the traditional structure of using multiple groups of Bailey frames as the load-bearing system. This not only simplifies the structural design of the sliding bracket and saves materials, but also makes the force of each component more clear. The sliding bracket erected on the side pier greatly reduces the center of gravity of the sliding bracket, making the sliding device closer to the top of the sliding bracket, ensuring the stability of the sliding system and providing a support basis for the stable sliding of the steel beam.

[0024] (2) In the sliding bracket of the present invention, the operating platform is arranged in such a way that the slideway beam is flush, which facilitates the adjustment of the sliding device at any time and provides a sufficient and reasonable construction operation space.

[0025] (3) In the sliding bracket of the present invention, the sliding block and the sliding beam cooperate with each other, so that the steel box beam can slide linearly in a single direction, ensuring that the sliding process is straight and not biased. During the construction process, it is no longer necessary to correct the sliding direction, which greatly improves the construction efficiency.

[0026] (4) In the sliding support of the present invention, the temporary pier is set as the middle support point of the steel box girder, and the temporary pier also serves as an assembly platform for the guide beam, bridge crane and steel box girder, which effectively utilizes the limited space.

[0027] Additional aspects and advantages of the present invention will be given in part in the description below, and in part will become apparent from the description below, or will be understood through the practice of the present invention. Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1It is a structural schematic diagram of the present invention.

[0030] Figure 2 It is another structural schematic diagram of the present invention.

[0031] Figure 3 It is a structural schematic diagram of the sliding bracket of the present invention.

[0032] Figure 4 It is a structural schematic diagram of a temporary pier of the present invention.

[0033] Figure 5 It is a structural schematic diagram of the steel pipe column of the present invention.

[0034] Figure 6 It is a structural schematic diagram of the longitudinal guide beam of the present invention.

[0035] In the figure: 1. sliding support, 2. steel pipe column, 3. temporary pier, 4. steel pipe column, 5. steel box beam, 6. slideway, 7. distribution beam, 8. guide beam, 4-1. transverse guide beam, 4-2. longitudinal guide beam. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] Based on the existing sliding support system, which includes at least columns, load-bearing beams, Bailey beams, distribution beams and slideways from bottom to top, such multi-layer structural stacking leads to a higher center of gravity of the sliding support, which in turn makes the center of gravity of the sliding support too high, resulting in reduced stability of the sliding support, which is not conducive to smooth sliding. Please refer to Figure 1-6 The present invention provides an embodiment to solve the above problem, which specifically includes the following steps:

[0039] S1. A temporary pier 3 is set up on the predetermined construction path of the bridge, and a sliding bracket 1 is set up between the side pier and the temporary pier 3. Specifically, a pier side bracket is first set up beside the side pier and the temporary pier 3. The two ends of the sliding bracket 1 are respectively set on the pier side brackets of the side pier and the temporary pier 3. A slideway 6 is set on the sliding bracket 1, and the slideway 6 is equipped with a sliding seat that slides with it. Limiting devices are provided on both sides of the slideway 6, wherein the sliding seat is used to carry the steel box girder 5, and the limiting device limits the steel box girder 5 to ensure that the steel box girder 5 moves along a precise transportation track. The limiting device is usually a guardrail or a guard plate;

[0040] Preferably, the sliding bracket 1 includes a distribution beam 7, which is connected to the top of the steel pipe column 4. A slide beam is arranged on the distribution beam 7. The slide beam is a box beam, which is the above-mentioned slide 6, and the slide seat is slidably connected to the slide beam; in the sliding bracket 1 of the present embodiment, by using the slide beam as the upper load-bearing structure of the sliding bracket 1, the traditional structure of using multiple groups of Bailey frames as the load-bearing system is changed, and the distribution beam 7 structure that needs to be arranged above the Bailey frame is also eliminated, thereby reducing the number of layers of the upper structural beams of the sliding bracket 1, which not only simplifies the structural design of the sliding bracket 1, saves materials, and makes the force of each component more clear, but also greatly reduces the center of gravity of the sliding bracket 1, so that the sliding device is closer to the top of the sliding bracket 1, ensuring the stability of the sliding system, and providing a support basis for the stable sliding of the steel box beam 5.

[0041] In order to drive the slider, in some embodiments, a steel beam sliding system is arranged on the sliding bracket 1, and the steel beam sliding system includes a through-type horizontal continuous jack, a jack reaction seat and a steel strand. The steel strand is connected to the through-type horizontal continuous jack, the slider is connected to the steel strand, and the through-type horizontal continuous jack is connected to the jack reaction seat. The through-type jack is a double-acting jack that uses a double hydraulic cylinder to tension prestressed tendons and top pressure anchors. It can save steel strands to the maximum extent during the tensioning process. This jack is particularly suitable for large-span structures and long steel wire bundles with large elongation. The steel strand is the main force-bearing element in the tensioning process. The through-type jack achieves prestressing of the structure by tensioning the steel strand. The jack reaction seat is a structure that provides reaction force for the through-type jack when it is working. It ensures that the through-type jack can work stably when applying force, and prevents equipment damage or safety accidents caused by excessive reaction force.

[0042] The through-type horizontal continuous jack transfers the force evenly to the slider through multiple steel strands, achieving smooth dragging of the steel box girder 5. The jack reaction seat provides a stable reaction force to ensure that the steel strands will not be excessively deformed under high-intensity tension. The design of this system ensures the synchronization and stability of the steel beam during sliding.

[0043] S2. Install a jacking device on the temporary pier 3, and set up an assembly bracket on the jacking device; Regarding the temporary pier 3, the temporary pier 3 serves as the middle support point of the steel box girder 5. The height of the temporary pier 3 is usually 19.5 to 45.4 meters. The design height of the temporary pier 3 is accurately calculated according to the span of the bridge and the construction environment to ensure that the temporary pier 3 can provide sufficient support capacity under various terrain conditions;

[0044] Preferably, the assembled support includes several steel pipe columns 4 and several pile foundations, the several pile foundations are installed on the seabed, the several steel pipe columns 4 correspond to and are connected to the several pile foundations one by one, and the several steel pipe columns 4 are connected with support rods to form a truss structure. The truss structure design of the assembled support enhances the overall stability. Especially in offshore construction, the installation of the pile foundation must undergo strict geological survey and design to ensure that it can withstand the influence of waves, tides and wind. By adding support rods between the 4 steel pipe columns, a stable triangular truss structure is formed, which further improves the wind and earthquake resistance of the support;

[0045] In some embodiments, the steel pipe column 4 is provided with connecting embedded parts inside, and the steel pipe column 4 is connected to the pile foundation through the connecting embedded parts. The embedded parts inside the steel pipe column 4 are then connected to the pile foundation through high-strength bolts or welding technology to form a stable bearing structure. The use of embedded parts enables the steel pipe column 4 to withstand various loads from the upper structure and apply these loads to the pile foundation.

[0046] S3. Use the crawler crane on the trestle to assemble the guide beam group 8 and two sections of steel box beams 5 on the assembly bracket, and assemble the beam erection crane on the assembled steel box beam 5; preferably, webs are provided on the opposite sides of the steel box beam 5, and the guide beam group 8 is connected to the webs. The guide beam group 8 includes 6 longitudinal guide beams 4-2 and 2 transverse guide beams 4-1, and the longitudinal guide beams 4-2 and the transverse guide beams 4-1 are cross-connected, wherein the cross-connection of the longitudinal and transverse guide beams forms a stable grid structure, which enhances the overall rigidity of the guide beam group 8. The criss-crossed guide beam group 8 structure can evenly distribute the load and ensure that the steel box girder 5 will not undergo local deformation or instability during the dragging process. In this step, a crawler crane is used as a lifting equipment, which has strong mobility and lifting capabilities and can be easily operated on the trestle. The assembly of the guide beam group 8 adopts prefabricated assembly technology to ensure that on-site operation is simple and fast. The guide beam and the steel box girder 5 are precisely connected and welded to ensure the stability of the overall structure. The assembly of the steel box girder 5 is completed by special clamps and cranes to ensure construction accuracy and the safety of the steel box girder 5.

[0047] The web, as an important structural component of the steel box girder 5, provides additional lateral support. The connection between the guide beam group 8 and the web is achieved through high-strength bolts and welding technology, ensuring that the guide beam group 8 can maintain the stability of the overall structure while supporting the steel box girder 5.

[0048] Among them, the cross connection of the longitudinal and transverse guide beams forms a stable grid structure 4-3, which enhances the overall rigidity of the guide beam group 8. The criss-crossed guide beam group 8 structure can evenly distribute the load and ensure that the steel box girder 5 will not undergo local deformation or instability during the towing process.

[0049] S4. Use the floating crane to lift the steel box girder 5 onto the sliding support 1, drag the steel box girder 5 along the sliding support 1 to the designed position, and then use the beam erection crane to lift the suspended steel box girder 5 until the side span steel girder frame is erected; the floating crane accurately places the prefabricated steel box girder 5 on the sliding support 1 through the lifting equipment. During the dragging process, the steel box girder 5 moves smoothly along the preset slideway 6, and the linkage control of the continuous jacking device ensures that the steel box girder 5 can reach the designed position;

[0050] The lifting of the suspended steel box girder 5 is completed section by section by a beam erecting crane, ensuring stability and safety during the erection process. The lifting capacity and operational flexibility of the floating crane can meet the lifting requirements of steel box girders 5 of different weights and sizes.

[0051] S5. Use the vertical jack to lift the steel box girder 5 on the assembling bracket, remove the jacking equipment, assembling bracket and sliding bracket 1, and then lower the steel box girder 5 and connect it with the side span steel beam frame; the use of the vertical jack can accurately control the height adjustment of the steel box girder 5 to ensure that the steel box girder 5 can be accurately lifted or lowered to the predetermined position. During this process, when removing the jacking equipment and the assembling bracket, special attention must be paid to the balance and stability of the bracket to avoid the steel box girder 5 from tilting or shifting during the lowering process. When the steel box girder 5 is lowered, a multi-point synchronous control system is used to ensure that the steel box girder 5 is evenly and smoothly docked with the side span steel beam frame.

[0052] S6. Use the cantilever of the beam erection crane to assemble the steel beam frame on the middle span side. The steel beam frame on the middle span side is divided into multiple sections for construction. Each time a steel beam section is erected, the inclined cables are symmetrically hung until the steel beam frame on the middle span side is erected to the joint section in the middle of the span. The assembly of the steel beam frame on the middle span side adopts the cantilever assembly method, assembling the steel beam frame section by section, and achieving stable docking of each section of the steel beam through the precise hoisting of the beam erection crane; the symmetrical hanging of the inclined cable adopts a hydraulic tensioning device to ensure that each inclined cable is evenly stressed and monitor the stress state of the steel beam frame in real time. The joint section of the middle span steel beam frame ensures the overall structural stability of the bridge through precise docking and welding technology.

[0053] S7. The cable-stayed cable is set on the top surface of the steel box girder 5 and a cable-laying channel is set along the direction of the bridge. The tower crane and the bridge deck crane cooperate in cable-laying and hanging. The cable-stayed cable is arranged along the longitudinal direction of the bridge. The design of the cable-laying channel ensures that the cable-stayed cable can pass through the bridge deck structure smoothly. The tower crane and the bridge deck crane work together to achieve accurate laying and hanging of the cable-stayed cable. During the cable-laying process, special equipment is used to monitor the tension to ensure that the cable-stayed cable maintains appropriate pre-tension at all stages of bridge construction, thereby ensuring the stability of the erection of the steel box girder 5.

[0054] S8. After the steel beams are connected, the steel beam box on the top of the temporary pier 3 is poured with weighted concrete, the concrete slag retaining wall is constructed, and the cables of the entire bridge are adjusted. After the steel beams are connected, the steel beam box on the top of the temporary pier 3 is poured with weighted concrete to increase the structural stability and prevent the sliding bracket from shifting during subsequent construction. The construction of the concrete slag retaining wall provides a stable construction platform for the subsequent bridge paving. At the same time, the cable adjustment process of the inclined cable is completed through an automatic tension control system to ensure that the tension distribution of the entire bridge is reasonable and the bridge structure can withstand the final load.

[0055] Since the present invention is constructed at sea, in offshore and open waters, the unpredictability of the marine environment will bring additional risks to the project. For example, strong winds at sea may occur suddenly. If hoisting is being carried out in S4 or S6 at this time, the sudden strong wind will directly act on the hoisting equipment and the steel box girder 5, thereby causing the steel box girder 5 to tilt. Although the on-site staff has an emergency risk avoidance plan to face sudden strong winds to ensure personal safety, after the strong wind, since the steel box girder 5 is relatively large, if the steel box girder 5 tilts, it is difficult for the human eye to observe. Although this tilt is slight, even an ordinary steel box girder 5 weighs 150-200 tons. Any slight tilt will lead to new risks and pose a safety hazard.

[0056] To this end, the present invention also provides some implementations to solve the above problems. Specifically, in S3, a sensing device is installed on the bottom surface of the steel box girder 5, and the sensing device includes a control panel, an anemometer, and detection sensors installed at the four corners of the steel box girder 5, wherein the anemometer and the detection sensor are respectively connected to the control panel signal. By default, the detection sensor is in a closed state to avoid wasting electric energy. When the anemometer detects that the sea breeze is greater than level 6, the anemometer will send a start signal to the control panel. After receiving the start signal, the control panel starts the detection sensor to detect the inclination angle and attitude deviation of the steel box girder 5 every 5 seconds. During this process, the anemometer also continuously detects the sea breeze speed until the anemometer detects that the sea breeze is less than level 6 and after a predetermined time T, the anemometer will send a stop signal to the control panel. After receiving the stop signal, the control panel turns off the detection sensor.

[0057] Specifically, the detection sensor can be a posture sensor or an inclination sensor; in this embodiment, the control panel first inputs the maximum inclination angle X of each side of the steel box girder 5, and defines that when the inclination angle of the steel box girder 5 is less than X, it is in a safe range. The detection sensor is used to detect whether the inclination angle of the steel box girder 5 is in a safe range. Preferably, the control panel is also configured with an alarm device and a signal transmission module for transmitting signals. The signal transmission module is specifically a Bluetooth module, a wifi module, etc. When the inclination angle of the steel box girder 5 exceeds the safe range, the detection sensor will generate a signal to the control panel. After receiving the signal sent by the detection sensor, the control panel activates the alarm device to warn nearby staff. At the same time, the control panel will also send a signal to the staff's mobile terminal through the signal transmission module to remind the staff. By setting a sensing device, the safety hazards left over after strong winds at sea can be solved.

[0058] It should be noted that the terms "first", "second", etc. in this document are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0059] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A method for constructing a steel beam sliding support beside a tower pier of a main channel cross-sea bridge, characterized in that: The following steps are involved: S1. Set up temporary piers on the planned construction path of the bridge, and set up sliding supports between the side piers and the temporary piers; S2. Install the jacking equipment on the temporary pier and set up the assembly bracket on the jacking equipment; S3, using the crawler crane on the trestle to assemble the guide beam group and two sections of steel box beams on the assembly bracket, and assembling the beam erection crane on the assembled steel box beam; S4. Use a floating crane to lift the steel box girder onto the sliding bracket, drag the steel box girder along the sliding bracket to the designed position, and then use a beam erection crane to hoist the suspended steel box girder until the side span steel beam frame is erected; S5. Use a vertical jack to lift the steel box girder on the assembling bracket, remove the jacking equipment, assembling bracket and sliding bracket, and then lower the steel box girder and connect it to the side span steel beam frame; S6. Use the cantilever of the beam erection crane to assemble the steel beam frame on the middle span side. Divide the steel beam frame on the middle span side into multiple sections for construction. After each steel beam section is erected, the inclined cables are symmetrically hung until the steel beam frame on the middle span side is erected to the joint section in the middle of the span. S7. The cable-stayed cable is set on the top surface of the steel box girder and a cable-laying channel is set along the direction of the bridge. The tower crane and the bridge deck truck crane cooperate with the cable-laying and hanging; S8. After the steel beams are connected, pour weighted concrete into the steel beam box on the temporary pier top, construct the concrete slag retaining wall, and adjust the cables of the entire bridge.

2. The method for constructing a steel beam sliding support beside a tower pier of a main channel cross-sea bridge according to claim 1, characterized in that: In S1, a pier side bracket is arranged beside the side pier or temporary pier, a sliding bracket is arranged on the pier side bracket, a sliding seat slidably matched with the sliding seat is provided on the slideway, and limiting devices are arranged on both sides of the slideway.

3. The method for constructing a steel beam sliding support beside a tower pier of a main channel cross-sea bridge according to claim 2 is characterized in that: In S2, the temporary pier serves as the intermediate support point of the steel box girder, and the height of the temporary pier is 19.5 to 45.4 meters.

4. The method for constructing a steel beam sliding support beside a tower pier of a main channel cross-sea bridge according to claim 3 is characterized in that: In S2, the assembled support includes a plurality of steel pipe columns and a plurality of pile foundations, the plurality of pile foundations are installed on the seabed surface, the plurality of steel pipe columns correspond to and are connected to the plurality of pile foundations one by one, and support rods are connected between the plurality of steel pipe columns to form a truss structure.

5. The method for constructing a steel beam sliding support beside a tower pier of a main channel sea-crossing bridge according to claim 2 is characterized in that: In S1, the sliding support includes a distribution beam, the distribution beam is connected to the top of the steel pipe column, a slideway beam is arranged on the distribution beam, the slideway beam is a box beam, and the slide seat is slidably connected to the slideway beam.

6. The method for constructing a steel beam sliding support beside a tower pier of a main channel sea-crossing bridge according to claim 1, characterized in that: Webs are provided on opposite sides of the steel box girder, and the guide beam groups are connected to the webs.

7. The method for constructing a steel beam sliding support beside a tower pier of a main channel sea-crossing bridge according to claim 6, characterized in that: The guide beam group includes 6 longitudinal guide beams and 2 transverse guide beams, and the longitudinal guide beams and the transverse guide beams are cross-connected.

8. The method for constructing a steel beam sliding support beside a tower pier of a main channel sea-crossing bridge according to claim 1, characterized in that: The sliding bracket is provided with a steel beam sliding system, which includes a through-type horizontal continuous jack, a jack reaction seat and a steel strand. The steel strand is connected to the through-type horizontal continuous jack, the slider is connected to the steel strand, and the through-type horizontal continuous jack is connected to the jack reaction seat.

9. The method for constructing a steel beam sliding support beside a tower pier of a main channel sea-crossing bridge according to claim 4, characterized in that: The steel pipe column is provided with connecting embedded parts inside, and the steel pipe column is connected to the pile foundation through the connecting embedded parts.

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