Construction method of island-bridge junction

Abstract

The present invention relates to a method for constructing an island-bridge junction, belonging to the technical field of water conservancy engineering. This method is used for constructing the connection between an artificial island and a bridge. The artificial island is constructed using a steel cylindrical cofferdam method. The method includes the following steps: erecting a pier pile foundation construction platform; erecting a box girder support; constructing an isolation retaining wall; cross-constructing a riprap slope embankment with the bridge pile foundation and piers; and constructing the box girder. This method constructs an isolation retaining wall between the artificial island wall and the pier pile foundation. The island wall riprap slope embankment and the bridge piles are cross-constructed, minimizing the adverse effects of pier pile foundation construction and artificial island wall construction, significantly reducing construction risks.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy projects, and in particular relates to a construction method for an island-bridge junction. Background Art

[0002] In some offshore submarine tunnel projects, it is sometimes necessary to build artificial islands in the sea for bridge-tunnel conversion. At the junction of the island and the bridge, the island wall of the artificial island and the bridge piers near one end of the artificial island are set close to each other. Since artificial islands are usually made of fill, the large load changes generated will cause long-term settlement and displacement of the soft strata of the original seabed. At the same time, the filling materials of the island body (including the island wall) themselves also need to undergo long-term settlement and deformation before they can be completely stable.

[0003] The bridge structure at the island-bridge junction is significantly affected by the displacement and deformation of the artificial island. The deformation of the artificial island wall squeezes the pier pile foundations, which in severe cases can affect the safety of the bridge foundation structure. Furthermore, bridge foundation construction can also affect the stability of the island wall, exacerbating its deformation and further compromising the safety of the bridge foundation.

[0004] Therefore, how to prevent the deformation of the artificial island wall from affecting the safety of the island-bridge combined with the pier pile foundation structure, and at the same time complete the construction of the bridge foundation and island wall at the island-bridge junction as soon as possible, is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] In response to the above technical problems, the present invention provides an island-bridge junction construction method, which builds an isolation retaining wall between the artificial island wall and the pier pile foundation, and adopts a cross-construction method for the island wall riprap slope embankment and the bridge pile foundation piers, thereby reducing the mutual adverse effects of pile foundation, pier construction and artificial island wall construction, significantly reducing construction risks, and ensuring the safety of the pier pile foundation structure.

[0006] The present invention provides an island-bridge junction construction method for constructing the connection portion between an artificial island and a bridge, wherein the artificial island is constructed using a steel cylinder cofferdam island-forming method. The island-bridge junction construction method comprises the following steps:

[0007] Erection of the pier pile foundation construction platform: The steel cylinder located at the junction of the bridge to be built and the artificial island is marked as the island-bridge junction steel cylinder. The first row of piers of the bridge to be built close to the island-bridge junction steel cylinder is marked as Pier No. 1. A pier pile foundation construction platform for the pile foundation construction of Pier No. 1 is set up at the preset construction position of Pier No. 1.

[0008] Box girder support erection: Box girder supports are erected between the pier pile foundation construction platform and the steel cylinder at the junction of the island bridge to support the box girder of the bridge to be built;

[0009] Isolation retaining wall construction: An isolation retaining wall extending along the width of the bridge to be constructed is constructed in the area between the pier pile foundation construction platform and the box girder support. The isolation retaining wall separates the space outside the steel cylinder of the island-bridge junction and below the bridge to be constructed into an island wall construction area located between the steel cylinder of the island-bridge junction and the isolation retaining wall, and a pile foundation construction area located on the side of the isolation retaining wall away from the steel cylinder of the island-bridge junction.

[0010] The cross construction of riprap slope embankment and bridge pile foundation piers includes the following steps:

[0011] The first stage of riprap construction of the riprap slope embankment is carried out in the island wall construction area, and counterpressure riprap construction is carried out in the pile foundation construction area;

[0012] After the first phase of riprap and counterpressure riprap is completed, the pile foundation of Pier 1 will be constructed using the pier pile foundation construction platform in the pile foundation construction area. Simultaneously, the second phase of riprap construction of the riprap slope embankment will be carried out in the island wall construction area. The abutment located at the junction of the bridge to be built and the artificial island will be designated as Abutment 0. Simultaneously with the second phase of riprap and the pile foundation of Pier 1, the pile foundation and casting of Abutment 0 will be carried out inside the steel cylinder at the junction of the island and bridge.

[0013] After the No. 1 Pier pile foundation construction is completed, the No. 1 Pier pouring construction will be carried out. After the No. 1 Pier pouring construction is completed, the remaining riprap construction of the riprap slope embankment will be carried out within the pile foundation construction area;

[0014] Box girder construction: Use box girder supports to erect the box girder between abutment 0 and pier 1.

[0015] In some embodiments, the isolation retaining wall is a steel pipe pile retaining wall, which includes steel pipe piles arranged in rows and a fence for connecting the steel pipe piles into one body, wherein the fences are two and are arranged on both sides of the steel pipe piles opposite to each other.

[0016] The specific steps of the isolation retaining wall construction steps are:

[0017] Connect the two fences used to construct the isolation retaining wall to the auxiliary connector used to hang the fences; when connecting the fences, make sure the two fences face each other and the distance between them is equal to the outer diameter of the steel pipe piles used to construct the isolation retaining wall;

[0018] Connect the auxiliary connector between the pier pile foundation construction platform and the box girder support so that the two enclosures connected by the auxiliary connector are suspended at the construction location of the isolation retaining wall to be constructed;

[0019] The positions of the steel pipe piles used to construct the isolation retaining wall are staked out one by one in the space between the two enclosures, and the steel pipe piles are vibrated and sunk one by one at the staked-out positions;

[0020] The tie rod is passed between two adjacent steel pipe piles, and the two surrounding bars located on both sides of the steel pipe pile are fastened together by the tie rod, so that the steel pipe piles are clamped by the two surrounding bars to complete the connection between the surrounding bars and the steel pipe piles.

[0021] In some embodiments, the auxiliary connector includes:

[0022] A suspension beam, with its ends connected to the pier pile foundation construction platform and the box beam support respectively, and its installation height is higher than the design top elevation of the isolation retaining wall to be constructed, so as to span above the isolation retaining wall to be constructed;

[0023] Two enclosure connectors are arranged opposite to each other, and are used to connect two enclosures respectively. The upper ends of the enclosure connectors are connected to the suspension beams, and the lower ends are used to connect the enclosures. The vertical distance between the lower ends of the enclosure connectors and the suspension beams is greater than the difference between the installation height of the suspension beams and the design top elevation of the isolation retaining wall to be built.

[0024] In some embodiments, multiple auxiliary connectors are used in the isolation retaining wall construction steps, and the installation positions of the multiple auxiliary connectors are spaced apart in the extension direction of the isolation retaining wall to be constructed. The multiple auxiliary connectors are located on the same side of the isolation retaining wall to be constructed, and the enclosure connectors are connected to the same enclosure.

[0025] In some embodiments, the box girder support erection step also includes parallel connection of the box girder supports.

[0026] In some embodiments, during the intersecting construction steps of the riprap slope embankment and the bridge pile foundation pier, when the back-pressure riprap construction is performed, construction space is reserved for the pile foundation construction and the casting construction of Pier No. 1; the specific steps of the casting construction of Pier No. 1 are as follows: a steel cofferdam for the casting construction of Pier No. 1 is constructed around the pile foundation of Pier No. 1 in the reserved construction space, riprap is performed between the steel cofferdam and the isolation retaining wall, Pier No. 1 is cast in the steel cofferdam, and the steel cofferdam is removed after the casting is completed; the specific steps of the remaining riprap construction are as follows: after the steel cofferdam is removed, riprap is performed around the completed Pier No. 1 into the reserved construction space to complete the remaining riprap construction of the riprap slope embankment.

[0027] In some of the embodiments, in the cross-construction steps of the riprap slope embankment and the bridge pile foundation piers, in the first stage of riprap construction, when the top elevation of the riprap of the formed riprap slope embankment on the side of the isolation retaining wall reaches the first design elevation, the first stage of riprap construction is completed; in the counter-pressure riprap construction, when the top elevation of the riprap reaches the second design elevation, the counter-pressure riprap construction is completed; in the second stage of riprap construction, when the top elevation of the riprap of the formed riprap slope embankment on the side of the steel cylinder at the junction of the island and bridge reaches the third design elevation and the top elevation of the riprap of the formed riprap slope embankment on the side of the isolation retaining wall reaches the fourth design elevation, the second stage of riprap construction is completed; wherein, the second design elevation < the first design elevation < the fourth design elevation < the third design elevation < the design top elevation of the isolation retaining wall.

[0028] In some embodiments, in the intersection construction step of the riprap slope embankment and the bridge pile foundation piers, after the second stage of riprap construction is completed, it also includes: installing multiple parallel tie rods between the top of the isolation retaining wall and the steel cylinder at the junction of the island bridge to tie and fix the isolation retaining wall.

[0029] In some of the embodiments, in the intersection construction steps of the riprap slope embankment and the bridge pile foundation piers, the specific steps of the pile foundation construction of Abutment No. 0 are as follows: the pile foundation casing of Abutment No. 0 is driven into the steel cylinder at the junction of the island and bridge, and the portion of the steel cylinder at the junction of the island and bridge except the pile foundation casing and the auxiliary grid are excavated and replaced with a filter layer. The replacement of the filter layer is stopped after the design bottom elevation of Abutment No. 0 is reached, and the pile foundation is poured into the pile foundation casing to form a pile foundation.

[0030] In some of the embodiments, the steps of cross-construction of the riprap slope embankment and the bridge pile foundation piers also include: pouring concrete blocks inside the steel cylinder at the junction of the island bridge and above the replaced inverted filter layer; wherein, the concrete blocks located on the side of abutment No. 0 facing pier No. 1 are poured after the construction of the pile foundation of abutment No. 0 is completed and before the pouring of abutment No. 0, and the remaining concrete blocks are poured after the construction of the riprap slope embankment is completed and before the construction of the box girder.

[0031] In some embodiments, in the step of intersecting the riprap slope embankment and the bridge pile foundation piers, after completing the remaining riprap construction of the riprap slope embankment, it also includes installing a twisted king-shaped block on the top of the riprap slope embankment formed by the riprap construction.

[0032] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0033] 1. The island-bridge junction construction method provided by the present invention separates the space below the bridge to be built into an island wall construction area and a pile foundation construction area by constructing an isolation retaining wall in the area between the island-bridge junction steel cylinder and the construction location of Pier No. 1. This can avoid mutual influence between the island wall construction and the pier pile foundation construction. On the one hand, by carrying out the first stage of riprap slope embankment construction in the island wall construction area, the island-bridge junction steel cylinder can be ballasted as early as possible, reducing the impact of deformation or displacement of the island-bridge junction steel cylinder on the subsequent construction of the No. 0 abutment pile foundation. On the other hand, the isolation retaining wall blocks the riprap slope embankment formed after the first and second stage riprap, thereby enhancing the stability of the riprap slope embankment and reducing the impact of the deformation of the riprap slope embankment on the construction of the No. 1 pier pile foundation.

[0034] 2. The island-bridge junction construction method provided by the present invention constructs an isolation retaining wall in the area between the steel cylinder at the island-bridge junction and the construction location of Pier No. 1, so that the bridge pile foundation and the riprap slope embankment, which is one of the island wall structures, are constructed in a zoned and cross-constructed manner. Before the piers are constructed, riprap construction can be carried out in the island wall construction area under the bridge near the island wall, thereby carrying out riprap construction of the island wall riprap slope embankment in advance. This not only helps to accelerate the overall progress of the island wall construction and post-construction settlement, but also enhances the overall stability and safety of the island wall area under the bridge during the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 A flowchart of a construction process for an island-bridge junction construction method according to an embodiment of the present invention;

[0037] Figure 2 A top view of the pier pile foundation construction platform and box girder support after erection in the island-bridge junction construction method provided by one embodiment of the present invention;

[0038] Figure 3 A top view of the isolation retaining wall after construction is completed in the island-bridge junction construction method provided by one embodiment of the present invention;

[0039] Figure 4 For the Figure 3 Cross-section along line AA;

[0040] Figure 5 A top view of a method for constructing an island-bridge junction according to one embodiment of the present invention, wherein an auxiliary connector is used to hang a fence at a construction location of an isolation retaining wall to be constructed;

[0041] Figure 6A schematic structural diagram of an auxiliary connector at an angle used in a method for constructing an island-bridge junction provided by one embodiment of the present invention;

[0042] Figure 7 A schematic structural diagram of an auxiliary connector used in the island-bridge joint construction method provided in one embodiment of the present invention, viewed from another angle;

[0043] Figure 8 A top view of driving steel pipe piles in a method for constructing an island-bridge junction provided by one embodiment of the present invention;

[0044] Figure 9 A schematic diagram of the structure of connecting the enclosures on both sides of steel pipe piles using tie rods in the island-bridge joint construction method provided by one embodiment of the present invention;

[0045] Figure 10 A cross-sectional view of the riprap slope embankment at the completion of the first stage of riprap construction and the backpressure riprap construction in the island-bridge junction construction method provided by one embodiment of the present invention;

[0046] Figure 11 A cross-sectional view of the second stage of riprap construction of the riprap slope embankment, the pile foundation construction of pier No. 1, and the pile foundation construction of abutment No. 0 in the island-bridge junction construction method provided by one embodiment of the present invention;

[0047] Figure 12 A schematic diagram of installing a tie rod between the top of the isolation retaining wall and the island-bridge junction steel cylinder in the island-bridge junction construction method provided by one embodiment of the present invention;

[0048] Figure 13 A cross-sectional view showing the concrete blocks poured on the side of abutment No. 0 facing pier No. 1 during the intersection construction of a riprap slope embankment and a bridge pile foundation pier in an island-bridge junction construction method provided by one embodiment of the present invention;

[0049] Figure 14 A cross-sectional view of abutment No. 0 upon completion of construction in an island-bridge junction construction method provided by one embodiment of the present invention;

[0050] Figure 15 A top view of the island-bridge junction construction method according to one embodiment of the present invention after the steel cofferdam is installed;

[0051] Figure 16 A cross-sectional view of the completion of the casting construction of Pier No. 1 in the island-bridge junction construction method provided by one embodiment of the present invention;

[0052] Figure 17 A cross-sectional view of the remaining riprap of the riprap slope embankment after completion of the construction of the island-bridge junction construction method provided by one embodiment of the present invention;

[0053] Figure 18 A cross-sectional view of the box girder after construction is completed in the island-bridge junction construction method provided by one embodiment of the present invention.

[0054] In the picture:

[0055] 1. Bridge to be constructed; 2. Steel cylinder at the island-bridge junction; 3. Pier pile foundation construction platform; 4. Box girder support; 5. Main trestle; 6. Support trestle; 7. Isolation retaining wall; 8. Auxiliary connector; 9. Tie rod; 10. Steel cofferdam;

[0056] 11. Abutment No. 0; 12. Abutment No. 0 pile foundation; 13. Pier No. 1 pile foundation; 14. Pier No. 1; 15. Box girder;

[0057] 21. Secondary grid;

[0058] 71. Steel pipe pile; 72. Enclosure; 73. Tie rod;

[0059] 81. Suspension beam; 82. Enclosure connector;

[0060] a. First-stage riprap construction area; b. Back-pressure riprap construction area; c. Second-stage riprap construction area; d. Inverted filter layer; e. Concrete block; f. Remaining riprap construction area; g. Twisted block. DETAILED DESCRIPTION

[0061] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described 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 making any creative efforts are within the scope of protection of the present invention.

[0062] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 should not be understood as limiting the present invention.

[0063] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0064] As attached Figure 1 As shown, in an illustrative embodiment of the island-bridge junction construction method of the present invention, this method is used to construct the connection between an artificial island and a bridge. The artificial island is constructed using a steel cylindrical cofferdam. With the artificial island as the rear and the bridge as the front, this method includes the steps of erecting a pier pile foundation construction platform, erecting a box girder support, constructing an isolation retaining wall, constructing the intersection of a riprap slope embankment with the bridge pile foundation and piers, and constructing a box girder. Each step is described in detail below.

[0065] S1 pier pile foundation construction platform erection: Figure 2 、 Figure 11 and Figure 16 As shown, the steel cylinder located at the junction of the bridge 1 to be built and the artificial island is recorded as the island-bridge junction steel cylinder 2, the first row of piers of the bridge 1 to be built close to the island-bridge junction steel cylinder 2 is recorded as Pier No. 1 14, and a pier pile foundation construction platform 3 for the construction of Pier No. 1 pile foundation 13 is erected at the preset construction position of Pier No. 1 14.

[0066] In this step, it should be noted that when the pier pile foundation is cast-in-place piles, the pier pile foundation construction platform 3 is specifically a drilling platform. It should also be noted that to facilitate the passage of construction machinery and equipment such as hoisting and transportation, a main trestle 5 is constructed to the right of the construction site of the bridge 1 to be built, and a branch trestle 6 connected to the main trestle 5 is constructed in front of the pier pile foundation construction platform 3.

[0067] S2 box girder support erection: Figure 2 and Figure 18 As shown, a box girder support 4 for supporting the box girder 15 of the bridge 1 to be built is set up between the pier pile foundation construction platform 3 and the island-bridge joint steel cylinder 2.

[0068] It should be noted that this step also includes paralleling the box beam supports 4 to reinforce the box beam supports 4 .

[0069] S3 Isolation Retaining Wall Construction: Figure 3 and Figure 4 As shown, an isolation retaining wall 7 extending along the width direction of the bridge to be built 1 is constructed in the area between the pier pile foundation construction platform 3 and the box girder support 4, so that the isolation retaining wall 7 separates the space outside the island-bridge junction steel cylinder 2 and below the bridge to be built into an island wall construction area between the island-bridge junction steel cylinder 2 and the isolation retaining wall 7 and a pile foundation construction area on the side of the isolation retaining wall 7 away from the island-bridge junction steel cylinder 2.

[0070] This step can avoid the mutual influence between the island wall construction and the pier pile foundation construction by building an isolation retaining wall 7 to isolate the island wall construction area and the pile foundation construction area. Figure 3 、 Figure 4 、 Figure 6 and Figure 8 As shown, the isolation retaining wall 7 is specifically a steel pipe pile retaining wall, which includes steel pipe piles 71 arranged in rows and enclosures 72 for connecting the steel pipe piles 71 into one. There are two enclosures 72, and the two enclosures 72 are arranged on both sides of the steel pipe piles 71 opposite to each other.

[0071] like Figure 5-Figure 9 As shown in FIG, the specific steps of the isolation retaining wall construction steps are:

[0072] Connect the two fences 72 used to construct the isolation retaining wall 7 to the auxiliary connector 8 used to hang the fences 72; when connecting the fences 72, make sure that the two fences 72 face each other and the distance between the two fences 72 is equal to the outer diameter of the steel pipe piles 71 used to construct the isolation retaining wall 7;

[0073] Connect the auxiliary connector 8 between the pier pile foundation construction platform 3 and the box beam support 4 so that the two enclosures 72 connected by the auxiliary connector 8 are suspended at the construction position of the isolation retaining wall 7 to be constructed;

[0074] The positions of the steel pipe piles 71 used to construct the isolation retaining wall 7 are set out one by one in the space between the two enclosures 72, and the steel pipe piles 71 are vibrated and sunk one by one at the positions obtained by setting out;

[0075] The tie rod 73 is passed between two adjacent steel pipe piles 71 , and the tie rod 73 is used to fasten the two enclosures 72 located on both sides of the steel pipe pile 71 , so that the two enclosures 72 clamp the steel pipe pile 71 , completing the connection between the enclosures 72 and the steel pipe pile 71 .

[0076] In the above-mentioned isolation retaining wall construction steps, the auxiliary connector 8 is used to suspend the enclosure 72 at the construction location of the isolation retaining wall 7 to be constructed, and then the steel pipe pile 71 is driven into the space between the two suspended enclosures 72. After the steel pipe pile 71 is driven, the two enclosures 72 are fastened together by the tie rod 73. The two enclosures 72 can then be used to clamp the steel pipe pile 71, completing the quick connection between the steel pipe pile 71 and the enclosure 72. At the same time, since the isolation retaining wall 7 is mainly used to isolate the construction area located underwater, the design top elevation of the isolation retaining wall 7 is near sea level. The enclosure 72 can be extended underwater through the suspension connection of the auxiliary connector 8, and the tie rod 73 can be connected underwater, thereby achieving a quick underwater connection between the steel pipe pile 71 and the enclosure 72, reducing the construction difficulty of the underwater isolation retaining wall 7 and improving construction efficiency.

[0077] like Figure 6 and Figure 7As shown, the auxiliary connector 8 includes a suspension beam 81 and two relatively arranged enclosure connectors 82; the two ends of the suspension beam 81 are respectively connected to the pier pile foundation construction platform 3 and the box beam support 4, and its installation height is higher than the design top elevation of the isolation retaining wall 7 to be constructed, so as to span above the isolation retaining wall 7 to be constructed; the two enclosure connectors 82 are respectively used to connect two enclosures 72, the upper end of the enclosure connector 82 is connected to the suspension beam 81, and the lower end is used to connect the enclosure 72, and the vertical distance between the lower end of the enclosure connector 82 and the suspension beam 81 is greater than the difference between the installation height of the suspension beam 81 and the design top elevation of the isolation retaining wall 7 to be constructed.

[0078] The auxiliary connector 8 is fixedly installed by the provided suspension beam 81, and the enclosure 72 is suspended and connected by the enclosure connector 82. It has a simple structure, low production cost, and good economic benefits.

[0079] In the above isolation retaining wall construction steps, it should be noted that Figure 5 As shown, multiple auxiliary connectors 8 are used in the construction of the isolation retaining wall 7. The installation positions of the multiple auxiliary connectors 8 are spaced apart in the extension direction of the isolation retaining wall 7 to be constructed. The enclosure connectors 82 of the multiple auxiliary connectors 8 located on the same side of the isolation retaining wall 7 to be constructed connect to the same enclosure 72. Suspending the enclosure 72 with multiple auxiliary connectors 8 helps maintain the enclosure 72's levelness. Furthermore, the multiple auxiliary connectors 8 share the weight of the enclosure 72, which helps reduce the stress on a single auxiliary connector 8 and mitigates construction risks.

[0080] It should also be noted that if Figure 8 As shown, when the steel pipe pile 71 is driven, when the pile position of the steel pipe pile 71 to be driven is located directly below the suspension beam 81 of the auxiliary connector 8, the portion of the suspension beam 81 of the auxiliary connector 8 located between the two enclosure connectors 82 is cut off to avoid affecting the construction of the steel pipe pile 71.

[0081] It should be further explained that the specific steps for vibrating and sinking the steel pipe pile 71 are as follows: installing a pile sinking guide frame at the pile position obtained by setting out, hoisting the steel pipe pile 71 to be driven into the pile sinking guide frame, using the pile sinking guide frame to control the sinking direction of the steel pipe pile 71, and using a vibrating hammer to vibrate and sink the steel pipe pile 71 to be vibrated. During the process of driving the steel pipe pile 71, two fences 72 connected by auxiliary connectors 8 are used to limit the sinking direction of the steel pipe pile 71. In conjunction with the pile sinking guide frame, the verticality of the steel pipe pile 71 can be controlled, thereby improving the accuracy and efficiency of the steel pipe pile 71 sinking construction.

[0082] The S4 riprap slope embankment and the bridge pile foundation piers are constructed in an intersecting manner. The intersecting construction includes the following steps:

[0083] like Figure 10As shown, the first stage of riprap construction of the riprap slope embankment is carried out in the island wall construction area (the first stage riprap construction area a is shown in FIG Figure 10 As shown), at the same time, the back pressure riprap construction is carried out in the pile foundation construction area (the back pressure riprap construction area b is as shown in Figure 10 shown);

[0084] like Figure 11 As shown in the figure, after the first stage riprap construction and counterpressure riprap construction are completed, the pile foundation 13 of pier No. 1 is constructed using the pier pile foundation construction platform 3 in the pile foundation construction area. At the same time, the second stage riprap construction of the riprap slope embankment is carried out above the riprap slope embankment formed by the first stage riprap construction in the island wall construction area (the second stage riprap construction area c is shown in the figure). Figure 11 shown);

[0085] like Figure 11 and Figure 14 As shown, the abutment located at the junction of the bridge 1 to be built and the artificial island is marked as abutment No. 0 11. While the second-stage riprap construction and the construction of the No. 1 pier pile foundation 13 are being carried out, the No. 0 abutment pile foundation 12 is being constructed inside the steel cylinder 2 at the junction of the island and bridge, and the pouring construction of the No. 0 abutment 11 is being carried out.

[0086] like Figure 15-17 As shown, after the construction of the No. 1 pier pile foundation 13 is completed, the No. 1 pier 14 is cast. After the casting construction of the No. 1 pier 14 is completed, the remaining riprap construction of the riprap slope embankment is carried out in the pile foundation construction area (the remaining riprap construction area is shown in FIG. Figure 17 shown);

[0087] In this step, the bridge pile foundation and the riprap slope embankment, which is one of the island wall structures, are constructed in a cross-construction manner, which has high construction efficiency. Among them, the first stage of riprap construction of the riprap slope embankment is first carried out in the island wall construction area separated by the isolation retaining wall 7, which can load the steel cylinder 2 of the island-bridge junction by pre-riprap, thereby reducing the impact of the deformation of the steel cylinder 2 of the island-bridge junction on the subsequent construction of the No. 0 abutment pile foundation 12; while the second stage of riprap construction of the riprap slope embankment is carried out in the island wall construction area, the No. 1 pier pile foundation 13 construction, the No. 0 abutment pile foundation 12 construction and the No. 0 abutment 11 casting construction are carried out, which can greatly improve the construction efficiency. At the same time, the isolation retaining wall 7 blocks the riprap slope embankment formed after the first stage of riprap and the second stage of riprap, thereby enhancing the stability of the riprap slope embankment and reducing the impact of the deformation of the riprap slope embankment on the construction of the No. 1 pier pile foundation 13; after the construction of the No. 1 pier pile foundation 13 is completed, the No. 1 pier 14 casting construction can be carried out directly. After the casting construction of the No. 1 pier 14 is completed, the remaining riprap construction of the riprap slope embankment is completed in the pile foundation construction area, and the pier construction and the island wall structure construction can be completed.

[0088] In the above-mentioned construction steps of the intersection of the riprap slope embankment and the bridge pile foundation pier, it should be noted that in order to facilitate the subsequent construction of the No. 1 pier pile foundation 13 and the pouring construction of the No. 1 pier 14, when the counter-pressure riprap construction is carried out, a construction space for the construction of the No. 1 pier pile foundation 13 and the pouring construction of the No. 1 pier 14 is reserved; Figure 15 and Figure 16 As shown, the specific steps for the pouring construction of Pier 14 are as follows: a steel cofferdam 10 for the pouring construction of Pier 14 is built around the pile foundation 13 of Pier 1 in the reserved construction space; rocks are thrown between the steel cofferdam 10 and the isolation retaining wall 7 to prevent scouring of the bottom of the isolation retaining wall 7; Pier 14 is poured into the steel cofferdam 10; and after the pouring is completed, the steel cofferdam 10 is removed; Figure 17 As shown, the specific steps of the remaining riprap construction are: after the steel cofferdam 10 is removed, riprap construction is carried out in the reserved construction space around the completed bridge pier No. 1 14 to complete the remaining riprap construction of the riprap slope embankment.

[0089] It should also be noted that the top elevations of the first-stage riprap construction, the counter-pressure riprap construction, and the second-stage riprap construction are controlled by the set design elevations. Specifically, in the first-stage riprap construction, when the top elevation of the riprap on the side of the formed riprap slope embankment abutting the isolation retaining wall 7 reaches the first design elevation, the first-stage riprap construction ends. In the counter-pressure riprap construction, when the top elevation of the riprap reaches the second design elevation, the counter-pressure riprap construction ends. In the second-stage riprap construction, when the top elevation of the riprap on the side of the island-bridge junction steel cylinder 2 reaches the third design elevation and the top elevation of the riprap on the side of the formed riprap slope embankment abutting the isolation retaining wall 7 reaches the fourth design elevation, the second-stage riprap construction ends. The second design elevation < the first design elevation < the fourth design elevation < the third design elevation < the design top elevation of the isolation retaining wall 7. It is understood that riprap construction can be implemented using bagged gravel or ton-bag fixed-point filling.

[0090] It is further necessary to explain that, Figure 11 and Figure 12 As shown, in the construction steps for the intersection of the riprap slope embankment and the bridge pile foundation piers, after the second stage of riprap construction is completed, a plurality of mutually parallel tie rods 9 are installed between the top of the isolation retaining wall 7 and the steel cylinder 2 at the junction of the island bridge to tie and secure the isolation retaining wall 7. The tie rods 9 used to tie and secure the isolation retaining wall 7 help improve the stability of the isolation retaining wall 7.

[0091] It is further necessary to explain that, Figure 11 and Figure 12As shown, in the cross construction steps of the riprap slope embankment and the bridge pile foundation piers, the specific steps of the No. 0 abutment pile foundation construction are as follows: the pile foundation casing of the No. 0 abutment 11 is driven into the steel cylinder 2 at the junction of the island and bridge, and the portion of the steel cylinder 2 at the junction of the island and bridge and the auxiliary grid 21 except the pile foundation casing are excavated and replaced with the inverted filter layer d. The inverted filter layer d is replaced and filled until it reaches the designed bottom elevation of the No. 0 abutment 11, and the No. 0 abutment pile foundation 12 is poured into the pile foundation casing.

[0092] It is further necessary to explain that, Figure 13 and Figure 17 As shown, the construction steps for the intersection of the riprap slope embankment and the bridge pile foundation piers also include: pouring concrete blocks e inside the steel cylinder 2 at the junction of the island and bridge and above the replaced inverted filter layer d to strengthen the island wall structure; wherein, the concrete blocks e located on the side of abutment No. 0 11 facing pier No. 1 14 are poured after the construction of abutment No. 0 pile foundation 12 is completed and before the pouring of abutment No. 0 11, and the remaining concrete blocks e are poured after the construction of the riprap slope embankment is completed and before the construction of the box girder 15, so as to avoid displacement and squeezing of abutment No. 0 11 caused by the settlement of the concrete blocks e.

[0093] It is further necessary to explain that, Figure 17 As shown, during the construction steps for the intersection of the riprap slope embankment and the bridge pile foundation piers, after completing the remaining riprap work on the riprap slope embankment, the process also includes installing twisting blocks (G) on top of the riprap slope embankment. As part of the island wall structure, twisting blocks (G) provide wave dissipation. It should be noted that the twisting blocks (G) are installed from front to back and from low to high.

[0094] S5 box girder construction: Figure 18 As shown, a box girder 15 is erected between abutment 11 No. 0 and pier 14 using box girder supports 4, with both ends of box girder 15 supported on abutment 11 No. 0 and pier 14 respectively. It should be noted that after the box girder 15 is erected, the exposed box girder supports 4 and steel pipe piles 71 of the isolation retaining wall 7 are removed along the slope of the island wall riprap slope to maintain the aesthetic appearance of the island wall structure.

[0095] The island-bridge junction construction method provided by the embodiment of the present invention can avoid mutual influence between the island wall construction and the pier pile foundation construction by constructing an isolation retaining wall 7 in the area between the island-bridge junction steel cylinder 2 and the construction position of pier No. 1 14, thereby separating the space below the bridge to be built into an island wall construction area and a pile foundation construction area. On the one hand, by carrying out the first stage of riprap construction of the riprap slope embankment in the island wall construction area, the island-bridge junction steel cylinder 2 can be ballasted as early as possible, thereby reducing the influence of the deformation or displacement of the island-bridge junction steel cylinder 2 on the subsequent construction of the No. 0 abutment pile foundation 12; on the other hand, the isolation retaining wall 7 blocks the riprap slope embankment formed after the first stage of riprap and the second stage of riprap, thereby enhancing the stability of the riprap slope embankment and reducing the influence of the deformation of the riprap slope embankment on the construction of the No. 1 pier pile foundation 13. At the same time, the island-bridge junction construction method provided by the embodiment of the present invention constructs an isolation retaining wall 7 in the area between the steel cylinder 2 and the construction position of the No. 1 bridge pier 14 at the island-bridge junction, so that the bridge pile foundation and the riprap slope embankment as one of the island wall structures are constructed in a zoned and cross-construction manner. Before the construction of the bridge piers, riprap construction can be carried out on the island wall construction area under the bridge close to the island wall, thereby carrying out riprap construction of the island wall riprap slope embankment in advance, which is not only conducive to accelerating the overall progress of the island wall construction and post-construction settlement, but also enhances the overall stability and safety of the island wall area under the bridge during the construction period.

[0096] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0097] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to preferred embodiments, persons skilled in the art should understand that the specific implementation methods of the present invention may still be modified or some technical features may be replaced by equivalents without departing from the spirit of the technical solutions of the present invention, and all of these should fall within the scope of the technical solutions claimed for protection by the present invention.

Claims

1. The island-bridge joint construction method is used for the construction of the connecting part between the artificial island and the bridge, wherein: The artificial island is constructed by using a steel cylinder cofferdam island forming method, which is characterized by comprising the following steps: Erection of the pier pile foundation construction platform: Erection of the pier pile foundation construction platform at the preset construction position of Pier No. 1 of the bridge to be built; Box girder support erection: erect box girder support between the pier pile foundation construction platform and the steel cylinder at the junction of the island bridge; Isolation retaining wall construction: An isolation retaining wall extending along the width direction of the bridge to be built is constructed in the area between the pier pile foundation construction platform and the box girder support, so as to separate the space outside the island-bridge junction steel cylinder and below the bridge to be built into an island wall construction area located between the island-bridge junction steel cylinder and the isolation retaining wall, and a pile foundation construction area located on the side of the isolation retaining wall away from the island-bridge junction steel cylinder; The cross construction of riprap slope embankment and bridge pile foundation piers includes the following steps: The first stage of riprap construction of the riprap slope embankment is carried out in the island wall construction area, and the back pressure riprap construction is carried out in the pile foundation construction area at the same time; After the first stage riprap construction and the counter-pressure riprap construction are completed, the pile foundation construction of Pier 1 is carried out using the pier pile foundation construction platform in the pile foundation construction area, and the second stage riprap construction of the riprap slope embankment is carried out in the island wall construction area. At the same time, the pile foundation construction and the casting construction of Abutment 0 of the bridge to be built are carried out in the steel cylinder at the island-bridge junction. After the pile foundation construction of Pier No. 1 is completed, the pouring construction of Pier No. 1 is carried out, and after the pouring construction of Pier No. 1 is completed, the remaining riprap construction of the riprap slope embankment is carried out in the pile foundation construction area; Box girder construction: using the box girder support to erect a box girder between the No. 0 abutment and the No. 1 pier; The isolation retaining wall is a steel pipe pile retaining wall, which includes steel pipe piles arranged in rows and enclosures for connecting the steel pipe piles into one body, wherein the enclosures are two and are arranged on both sides of the steel pipe piles opposite to each other. The specific steps of the isolation retaining wall construction step are: Connecting the two fences used to construct the isolation retaining wall to auxiliary connectors used to hang the fences; when connecting the fences, the two fences are opposite to each other, and the distance between the two fences is equal to the outer diameter of the steel pipe piles used to construct the isolation retaining wall; Connecting the auxiliary connector between the pier pile foundation construction platform and the box beam support, so that the two enclosures connected by the auxiliary connector are suspended at the construction position of the isolation retaining wall to be constructed; Staking out the positions of the steel pipe piles used to construct the isolation retaining wall one by one in the space between the two enclosures, and vibrating and sinking the steel pipe piles one by one at the staked-out positions; Passing a tie rod between two adjacent steel pipe piles, and using the tie rod to fasten the two enclosures located on both sides of the steel pipe pile, so as to clamp the steel pipe pile with the two enclosures, thereby completing the connection between the enclosure and the steel pipe pile; Wherein, the auxiliary connector includes: a suspension beam, whose ends are respectively connected to the pier pile foundation construction platform and the box beam support, and whose installation height is higher than the design top elevation of the isolation retaining wall to be constructed so as to span above the isolation retaining wall to be constructed; Two enclosure connectors are arranged opposite to each other, and are respectively used to connect two enclosures. The upper ends of the enclosure connectors are connected to the suspension beams, and the lower ends are used to connect the enclosures. The vertical distance between the lower ends of the enclosure connectors and the suspension beams is greater than the difference between the installation height of the suspension beams and the design top elevation of the isolation retaining wall to be built.

2. The island-bridge joint construction method according to claim 1, characterized in that: The step of erecting the box beam support also includes parallel connection of the box beam support.

3. The island-bridge joint construction method according to claim 1, characterized in that: In the intersection construction steps of the riprap slope embankment and the bridge pile foundation pier, when the counter-pressure riprap construction is carried out, construction space is reserved for the pile foundation construction of Pier No. 1 and the casting construction of Pier No. 1; the specific steps of the casting construction of Pier No. 1 are: a steel cofferdam for the casting construction of Pier No. 1 is set up around the pile foundation of Pier No. 1 in the reserved construction space, riprap is carried out between the steel cofferdam and the isolation retaining wall, Pier No. 1 is cast in the steel cofferdam, and the steel cofferdam is removed after the casting is completed; the specific steps of the remaining riprap construction are: after the steel cofferdam is removed, riprap construction is carried out in the reserved construction space around the completed Pier No. 1 to complete the remaining riprap construction of the riprap slope embankment.

4. The island-bridge joint construction method according to claim 1, characterized in that: In the intersection construction steps of the riprap slope embankment and the bridge pile foundation piers, in the first stage of riprap construction, when the top elevation of the riprap of the formed riprap slope embankment on the side of the isolation retaining wall reaches the first design elevation, the first stage of riprap construction is completed; in the counter-pressure riprap construction, when the top elevation of the riprap reaches the second design elevation, the counter-pressure riprap construction is completed; in the second stage of riprap construction, when the top elevation of the riprap of the formed riprap slope embankment on the side of the steel cylinder of the island-bridge junction reaches the third design elevation and the top elevation of the riprap of the formed riprap slope embankment on the side of the isolation retaining wall reaches the fourth design elevation, the second stage of riprap construction is completed; wherein, the second design elevation < the first design elevation < the fourth design elevation < the third design elevation < the design top elevation of the isolation retaining wall.

5. The island-bridge joint construction method according to claim 1, characterized in that: In the intersection construction step of the riprap slope embankment and the bridge pile foundation pier, after the second stage of riprap construction is completed, it also includes: installing a plurality of mutually parallel tie rods between the top of the isolation retaining wall and the steel cylinder at the junction of the island bridge to tie and fix the isolation retaining wall.

6. The island-bridge joint construction method according to claim 1, characterized in that: In the intersection construction steps of the riprap slope embankment and the bridge pile foundation piers, the specific steps of the pile foundation construction of Abutment No. 0 are: the pile foundation casing of Abutment No. 0 is driven into the steel cylinder at the junction of the island and bridge, and the part of the steel cylinder at the junction of the island and bridge and the auxiliary grid except the pile foundation casing are excavated and replaced with a filter layer. The filter layer is replaced and filled until the design bottom elevation of Abutment No. 0 is reached, and the pile foundation is poured into the pile foundation casing to form a pile foundation.

7. The island-bridge joint construction method according to claim 6, characterized in that: The intersection construction steps of the riprap slope embankment and the bridge pile foundation piers also include: pouring concrete blocks in the steel cylinder at the junction of the island bridge and above the replaced inverted filter layer; wherein, the concrete blocks located on the side of the No. 0 abutment facing the No. 1 abutment are poured after the construction of the No. 0 abutment pile foundation is completed and before the casting construction of the No. 0 abutment, and the remaining concrete blocks are poured after the construction of the riprap slope embankment is completed and before the box girder is constructed.

8. The island-bridge joint construction method according to claim 1, characterized in that: The step of intersecting the riprap slope embankment and the bridge pile foundation piers further includes installing a twisted king-shaped block on the top of the riprap slope embankment formed by the riprap construction after completing the remaining riprap construction of the riprap slope embankment.

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