Island bridge joint construction method

Abstract

The invention relates to an island-bridge joint construction method, and belongs to the technical field of water conservancy projects. The island-bridge combination part construction method is used for construction of a connection part of an artificial island and a bridge, the artificial island is built by adopting a steel cylinder cofferdam island forming method, and the island-bridge combination part construction method comprises the following steps: erecting a pier pile foundation construction platform; erecting a box girder bracket; constructing an isolation retaining wall; performing cross construction on the riprap slope dike and the bridge pile foundation pier; and box girder construction. According to the island-bridge joint construction method, the isolation retaining wall is built between the artificial island wall and the pier pile foundation, and the island wall riprap slope embankment and the bridge pile adopt a cross construction mode, so that the mutual adverse effect between the construction of the pier pile foundation and the construction of the artificial island wall is reduced, and the construction risk is remarkably reduced.

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 the artificial island is usually composed of fill, the large load changes it produces will cause long-term settlement and displacement of the soft strata of the original seabed. At the same time, the filling material of the island body (including the island wall) itself also needs to undergo long-term settlement and deformation before it can be completely stable.

[0003] The bridge structure at the junction of the island and bridge is greatly affected by the displacement and deformation of the artificial island. The deformation of the artificial island wall squeezes the pier pile foundation, which will seriously affect the safety of the bridge foundation structure. At the same time, the construction of the bridge foundation may also affect the stability of the island wall, aggravate the deformation of the island wall, and further aggravate the impact on 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 constructs 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 joint construction method for the construction of a connecting portion between an artificial island and a bridge, wherein the artificial island is constructed by a steel cylinder cofferdam island forming method, and the island-bridge joint construction method comprises the following steps: Construction platform for pier pile foundation: the steel cylinder located at the junction of the bridge to be built and the artificial island is recorded 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 recorded as Pier No. 1, and 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; Box girder support erection: a box girder support for supporting the box girder of the bridge to be built is erected 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 that the isolation retaining wall separates the space outside the steel cylinder of the island-bridge junction and below the bridge to be built into an island wall construction area between the steel cylinder of the island-bridge junction and the isolation retaining wall and a pile foundation construction area on the side of the isolation retaining wall away from the steel cylinder of the island-bridge junction; The cross construction of riprap slope embankment and bridge pile foundation pier 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 counterpressure riprap construction is carried out in the pile foundation construction area; After the first stage of riprap construction and counter-pressure riprap construction are completed, the pile foundation construction of pier No. 1 is carried out using the pier pile foundation construction platform in the pile foundation construction area, and the second stage of riprap construction of the riprap slope embankment is carried out in the island wall construction area; the abutment located at the junction of the bridge to be built and the artificial island is marked as abutment No. 0, and while the second stage of riprap construction and the pile foundation construction of pier No. 1 are being carried out, the pile foundation construction of abutment No. 0 and the casting construction of abutment No. 0 are carried out in the steel cylinder at the junction of the island and bridge; After the pile foundation construction of Pier 1 is completed, the pouring construction of Pier 1 is carried out, and after the pouring construction of Pier 1 is completed, the remaining riprap construction of the riprap slope embankment is carried out in the pile foundation construction area; Box girder construction: Use box girder supports to erect the box girder between abutment 0 and pier 1.

[0007] In some embodiments, 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, wherein the enclosures are two, and the two enclosures are arranged oppositely on both sides of the steel pipe piles; The specific steps of the isolation retaining wall construction steps are: Connect two fences used to build the isolation retaining wall to the auxiliary connector used to hang the fences; when connecting the fences, make the two fences face each other, and the distance between the two fences is equal to the outer diameter of the steel pipe piles used to build the isolation retaining wall; Connect 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; The positions of the steel pipe piles used to construct the isolation retaining wall are set 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 pile positions obtained by setting out; The tie rod is passed between two adjacent steel pipe piles, and the two enclosures located on both sides of the steel pipe pile are fastened and connected by the tie rod, so that the steel pipe pile is clamped by the two enclosures to complete the connection between the enclosure and the steel pipe pile.

[0008] In some embodiments, the auxiliary connector includes: A suspension beam, with its two 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 the top of the isolation retaining wall to be constructed; 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 constructed.

[0009] In some of the 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 enclosure connectors of the multiple auxiliary connectors located on the same side of the isolation retaining wall to be constructed are connected to the same enclosure.

[0010] In some of the embodiments, the step of erecting the box girder supports also includes paralleling the box girder supports.

[0011] In some of the embodiments, in the cross construction steps of the riprap slope embankment and the bridge pile foundation pier, when the back-pressure riprap construction is carried out, a 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 built 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.

[0012] 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 formed on the side of the isolation retaining wall of the riprap slope embankment 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 formed 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 formed on the side of the isolation retaining wall of the riprap slope embankment reaches the fourth design elevation, the second stage of riprap construction is completed; wherein, the second design elevation < first design elevation < fourth design elevation < third design elevation < design top elevation of the isolation retaining wall.

[0013] In some of the embodiments, in the cross construction steps of the riprap slope embankment and the bridge pile foundation piers, after the second stage 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.

[0014] 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: 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, and 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.

[0015] 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 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 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.

[0016] In some of the embodiments, in the step of intersecting the riprap slope embankment and the bridge pile foundation pier, 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.

[0017] Compared with the prior art, the advantages and beneficial effects of the present invention are: 1. The island-bridge joint construction method provided by the present invention can avoid the mutual influence between the island wall construction and the pier pile foundation construction by constructing an isolation retaining wall in the area between the island-bridge joint steel cylinder and the No. 1 bridge pier construction position to separate the space below the bridge to be built into the island wall construction area and the pile foundation construction area: on the one hand, by carrying out the first stage of riprap slope embankment construction in the island wall construction area, the island-bridge joint steel cylinder can be ballasted as early as possible, reducing the influence of the deformation or displacement of the island-bridge joint steel cylinder on the subsequent No. 0 bridge abutment pile foundation construction; on the other hand, the isolation retaining wall 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 No. 1 bridge pier pile foundation construction; 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 position of Pier 1, so that the bridge pile foundation and the riprap slope embankment as one of the island wall structures are constructed in a zoned cross-construction manner. Before the pier construction, the island wall construction area under the bridge close to the island wall can be subjected to riprap construction, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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: Figure 1 A construction flow chart of an island-bridge joint construction method provided by one embodiment of the present invention; Figure 2 A top view of a pier pile foundation construction platform and a box beam support after erection in an island-bridge joint construction method provided by one embodiment of the present invention; Figure 3 A top view of the isolation retaining wall when the construction is completed in the island-bridge joint construction method provided by one embodiment of the present invention; Figure 4 For along Figure 3 Cross-section along line AA; Figure 5 A top view of a method for constructing an island-bridge joint provided in one embodiment of the present invention, in which an auxiliary connector is used to hang a fence at a construction position of an isolation retaining wall to be constructed; Figure 6 A schematic structural diagram of an auxiliary connector at an angle used in a construction method for an island-bridge joint provided in an embodiment of the present invention; Figure 7 A schematic structural diagram of an auxiliary connector used in an island-bridge joint construction method provided in one embodiment of the present invention at another angle; Figure 8 A top view of driving steel pipe piles in a construction method for an island-bridge junction provided by an embodiment of the present invention; Fig. 9 A schematic diagram of a structure for connecting the enclosures on both sides of steel pipe piles by using tie rods in a construction method for an island-bridge joint provided by an embodiment of the present invention; Fig.10 A cross-sectional view of the riprap slope embankment when the first stage riprap construction and the back pressure riprap construction are completed in the island-bridge joint construction method provided by one embodiment of the present invention; Fig.11A cross-sectional view of the riprap slope embankment second stage riprap construction, No. 1 bridge pier pile foundation construction, and No. 0 bridge abutment pile foundation construction in the island-bridge joint construction method provided by one embodiment of the present invention when the construction is completed; Fig.12 A schematic diagram of installing a tie rod between the top of the isolation retaining wall and the island-bridge joint steel cylinder in the island-bridge joint construction method provided by one embodiment of the present invention; Fig.13 A cross-sectional view of a bridge abutment No. 0 after pouring concrete blocks on the side facing the bridge pier No. 1 during the cross construction of the riprap slope embankment and the bridge pile foundation pier in the island-bridge joint construction method provided by one embodiment of the present invention; Fig.14 A cross-sectional view of abutment No. 0 when construction is completed in an island-bridge joint construction method provided by one embodiment of the present invention; Fig.15 A top view of a method for constructing an island-bridge junction provided by one embodiment of the present invention after a steel cofferdam is installed; Fig.16 A cross-sectional view of the completion of the pouring construction of bridge pier No. 1 in the island-bridge joint construction method provided by one embodiment of the present invention; Fig.17 A cross-sectional view of the remaining riprap of the riprap slope embankment after the construction of the riprap slope embankment is completed in the island-bridge joint construction method provided by one embodiment of the present invention; Fig.18 A cross-sectional view of a box girder after construction is completed in an island-bridge joint construction method provided in one embodiment of the present invention.

[0019] In the figure: 1. Bridge to be built; 2. Steel cylinder at the junction of island and bridge; 3. Construction platform for pier pile foundation; 4. Box beam support; 5. Main trestle; 6. Support trestle; 7. Isolation retaining wall; 8. Auxiliary connector; 9. Tie rod; 10. Steel cofferdam; 11. Abutment No. 0; 12. Pile foundation of abutment No. 0; 13. Pile foundation of pier No. 1; 14. Pier No. 1; 15. Box girder; 21. Secondary form; 71. Steel pipe pile; 72. Enclosure; 73. Tie rod; 81. Suspension beam; 82. Enclosure connector; 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

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] 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" and "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 a limitation on the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] As attached Figure 1 As shown, in an exemplary embodiment of the island-bridge joint construction method of the present invention, the island-bridge joint construction method is used for the construction of the connecting part of the artificial island and the bridge, wherein the artificial island is constructed by the steel cylinder cofferdam island forming method. With the direction toward the artificial island as the rear and the direction toward the bridge as the front, the island-bridge joint construction method includes the steps of erecting the pier pile foundation construction platform, erecting the box beam support, constructing the isolation retaining wall, constructing the riprap slope embankment and the bridge pile foundation pier intersection construction, and constructing the box beam. Each step is described in detail below.

[0024] S1 pier pile foundation construction platform erection: Figure 2 , Fig.11 and Fig.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.

[0025] In this step, it should be noted that when the pier pile foundation adopts cast-in-place piles, the pier pile foundation construction platform 3 is specifically a drilling platform. It should also be noted that in order to facilitate the passage of construction machinery and equipment such as lifting and transportation, a main trestle bridge 5 needs to be built on the right side of the construction position of the bridge to be built 1, and a branch trestle bridge 6 connected to the main trestle bridge 5 is built on the front side of the pier pile foundation construction platform 3.

[0026] S2 box girder support erection: Figure 2 and Fig.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.

[0027] It should be noted that this step also includes paralleling the box beam support 4 to reinforce the box beam support 4 .

[0028] 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 1 to be built 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 1 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.

[0029] In this step, the island wall construction area and the pile foundation construction area are separated by building an isolation retaining wall 7, which can avoid the mutual influence between the island wall construction and the pier pile foundation construction. 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 body. 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.

[0030] like Figure 5-Figure 9 As shown, the specific steps of the isolation retaining wall construction steps are: Connect 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 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; 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; 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 pile positions obtained by setting out; The tension rod 73 is passed between two adjacent steel pipe piles 71 , and the two enclosures 72 located on both sides of the steel pipe pile 71 are fastened and connected by the tension rod 73 , so that the two enclosures 72 are used to clamp the steel pipe pile 71 , thereby completing the connection between the enclosure 72 and the steel pipe pile 71 .

[0031] In the above isolation retaining wall construction steps, the auxiliary connector 8 is used to hang the enclosure 72 at the construction position of the isolation retaining wall 7 to be constructed, and then the steel pipe pile 71 is driven in the space between the two suspended enclosures 72. After the steel pipe pile 71 is driven, the two enclosures 72 are fastened and connected by the tie rod 73, and the two enclosures 72 can be used to clamp the steel pipe pile 71 to complete 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 the sea level. The enclosure 72 can be extended underwater through the hanging connection of the auxiliary connector 8, and the tie rod 73 is connected underwater, thereby realizing the underwater quick connection between the steel pipe pile 71 and the enclosure 72, reducing the construction difficulty of the underwater isolation retaining wall 7 and improving the construction efficiency.

[0032] like Figure 6 and Figure 7 As 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 built, so as to span above the isolation retaining wall 7 to be built; 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 built.

[0033] The auxiliary connector 8 is fixedly installed by the suspension beam 81, and the enclosure 72 is suspended by the enclosure connector 82. It has a simple structure, low manufacturing cost and good economic benefits.

[0034] In the above isolation retaining wall construction steps, it should be noted that Figure 5As shown, multiple auxiliary connectors 8 are used in the construction steps 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 are connected to the same enclosure 72. The enclosure 72 is suspended by multiple auxiliary connectors 8, which is conducive to keeping the enclosure 72 horizontal. At the same time, the multiple auxiliary connectors 8 share the weight of the enclosure 72, which is conducive to reducing the force on a single auxiliary connector 8 and reducing construction risks.

[0035] 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.

[0036] It should be further explained that the specific steps of 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, hanging and placing 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. In the process of driving the steel pipe pile 71, two enclosures 72 connected by the auxiliary connector 8 are used to limit the sinking direction of the steel pipe pile 71, which, in conjunction with the pile sinking guide frame, can control the verticality of the steel pipe pile 71 and improve the pile sinking construction accuracy and construction efficiency of the steel pipe pile 71.

[0037] S4 riprap slope embankment and bridge pile foundation piers are cross-constructed, and the cross-construction includes the following steps: like Fig.10 As shown in the figure, the first stage of riprap construction of the riprap slope embankment is carried out in the island wall construction area (the first stage of riprap construction area a is as shown in the figure). Fig.10 As shown in Figure 2), at the same time, back pressure riprap construction is carried out in the pile foundation construction area (back pressure riprap construction area b is as shown in Figure 2). Fig.10 shown); like Fig.11 As shown in the figure, after the first stage riprap construction and the back pressure riprap construction are completed, the No. 1 pier pile foundation 13 is constructed using the pier pile foundation construction platform 3 in the pile foundation construction area, and 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). Fig.11 shown); like Fig.11 and Fig.14As 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, and while the second-stage riprap construction and the No. 1 pier pile foundation 13 are being constructed, the No. 0 abutment pile foundation 12 is being constructed in the steel cylinder 2 at the junction of the island and bridge, and the casting construction of the No. 0 abutment 11 is being carried out; like Figure 15-17 As shown, after the construction of the No. 1 bridge pier pile foundation 13 is completed, the No. 1 bridge pier 14 is cast, and after the casting construction of the No. 1 bridge 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 as shown in FIG. Fig.17 shown); In this step, the bridge pile foundation and the riprap slope embankment as 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 influence of the deformation of the steel cylinder 2 of the island-bridge junction on the subsequent construction of the pile foundation 12 of the pier No. 0; while the second stage of riprap construction of the riprap slope embankment is carried out in the island wall construction area, the construction of the pile foundation 13 of the pier No. 1, the construction of the pile foundation 12 of the pier No. 0 and the casting construction of the pier No. 0 are carried out, which can greatly improve the construction efficiency. At the same time, the riprap slope embankment formed after the first stage of riprap and the second stage of riprap is blocked by the isolation retaining wall 7, which enhances the stability of the riprap slope embankment and reduces the influence of the deformation of the riprap slope embankment on the construction of the pile foundation 13 of the pier No. 1; after the construction of the pile foundation 13 of the pier No. 1 is completed, the casting construction of the pier No. 1 14 can be carried out directly. After the casting construction of the pier No. 1 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.

[0038] 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 back-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; Fig.15 and Fig.16 As shown, the specific steps of the pouring construction of the No. 1 bridge pier 14 are as follows: a steel cofferdam 10 for the pouring construction of the No. 1 bridge pier 14 is set up around the No. 1 bridge pier pile foundation 13 in the reserved construction space, stones 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, the No. 1 bridge pier 14 is poured in the steel cofferdam 10, and the steel cofferdam 10 is removed after the pouring is completed; Fig.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.

[0039] 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 elevation. Specifically, in the first-stage riprap construction, when the top elevation of the riprap formed by the riprap slope embankment attached to the isolation retaining wall 7 reaches the first design elevation, the first-stage 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 riprap construction, when the top elevation of the riprap formed by the riprap slope embankment attached to the side of the steel cylinder 2 of the island-bridge junction reaches the third design elevation and the top elevation of the riprap formed by the riprap slope embankment attached to the side of the isolation retaining wall 7 reaches the fourth design elevation, the second-stage 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 7. It can be understood that the riprap construction can be implemented by bagged crushed stone or ton bag fixed-point dumping.

[0040] It is also necessary to explain that if Fig.11 and Fig.12 As shown, in the construction steps of the intersection of the riprap slope embankment and the bridge pile foundation pier, after the second stage riprap construction is completed, it also includes: installing a plurality of mutually parallel tie rods 9 between the top of the isolation retaining wall 7 and the steel cylinder 2 at the junction of the island bridge to tie and fix the isolation retaining wall 7. Tie and fix the isolation retaining wall 7 by the set tie rods 9, which is conducive to improving the stability of the isolation retaining wall 7.

[0041] It is also necessary to explain that if Fig.11 and Fig.12 As shown, in the construction steps of the intersection 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 11 is driven into the steel cylinder 2 at the junction of the island and bridge, and the part 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 the designed bottom elevation of Abutment No. 0 11 is reached, and the pile foundation 12 of Abutment No. 0 is poured into the pile foundation casing.

[0042] It is also necessary to explain that if Fig.13 and Fig.17 As shown, the construction steps of the intersection of the riprap slope embankment and the bridge pile foundation pier also include: pouring concrete blocks e in 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 the No. 0 abutment 11 facing the No. 1 pier 14 are poured after the construction of the No. 0 abutment pile foundation 12 is completed and before the pouring of the No. 0 abutment 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 the displacement and squeezing of the No. 0 abutment 11 caused by the settlement of the concrete blocks e.

[0043] It is also necessary to explain that if Fig.17As shown, in the construction steps of the intersection of the riprap slope embankment and the bridge pile foundation pier, after the remaining riprap construction of the riprap slope embankment is completed, it also includes installing a twisting king block g on the top of the riprap slope embankment formed by the riprap construction. The twisting king block g, as one of the island wall structures, plays a role in wave dissipation. It should be noted that the twisting king block g is installed from front to back and from low to high.

[0044] S5 box girder construction: Fig.18 As shown, a box beam 15 is erected between abutment 0 11 and pier 14 using a box beam support 4, wherein both ends of the box beam 15 are respectively supported on abutment 0 11 and pier 14. It should be noted that after the box beam 15 is erected, the exposed box beam support 4 and the steel pipe piles 71 of the isolation retaining wall 7 are cut off along the inclined surface of the riprap slope embankment of the island wall to keep the island wall structure beautiful.

[0045] The island-bridge junction construction method provided by the embodiment of the present invention can avoid the mutual influence of 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 the No. 1 bridge pier 14, so as to separate the space below the bridge to be built into the island wall construction area and the 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 bridge abutment pile foundation 12; on the other hand, the riprap slope embankment formed after the first stage of riprap and the second stage of riprap is blocked by the isolation retaining wall 7, 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 bridge pier pile foundation 13. At the same time, the island-bridge joint construction method provided by the embodiment of the present invention constructs an isolation retaining wall 7 in the area between the steel cylinder 2 of the island-bridge joint and the construction position of the No. 1 bridge pier 14, so that the bridge pile foundation and the riprap slope embankment as one of the island wall structures are constructed in a zoned cross-construction manner. Before the pier construction, the island wall construction area under the bridge close to the island wall can be subjected to riprap construction, 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.

[0046] 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.

[0047] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of 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 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 the No. 1 pier of the bridge to be built; Box girder support erection: erect a 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 in 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 between the island-bridge junction steel cylinder and the isolation retaining wall and a pile foundation construction area 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 pier 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; After the first stage of riprap construction and the back pressure riprap construction are completed, the No. 1 pier pile foundation construction is carried out in the pile foundation construction area using the pier pile foundation construction platform, and the second stage of riprap construction of the riprap slope embankment is carried out in the island wall construction area, and the No. 0 abutment pile foundation construction and No. 0 abutment casting construction of the bridge to be built are carried out in the steel cylinder at the island-bridge junction; After the pile foundation construction of the No. 1 bridge pier is completed, the pouring construction of the No. 1 bridge pier is carried out, and after the pouring construction of the No. 1 bridge pier is completed, the remaining riprap construction of the riprap slope embankment is carried out in the pile foundation construction area; Box girder construction: Use the box girder support to erect a box girder between the No. 0 abutment and the No. 1 pier.

2. The island-bridge joint construction method according to claim 1, characterized in that: 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 the two enclosures are arranged oppositely on both sides of the steel pipe piles; The specific steps of the isolation retaining wall construction step are: Connecting the two fences used to construct the isolation retaining wall to the auxiliary connector 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; The tension rod is passed through between two adjacent steel pipe piles, and the two enclosures located on both sides of the steel pipe pile are fastened and connected by the tension rod, so that the steel pipe pile is clamped by the two enclosures to complete the connection between the enclosure and the steel pipe pile.

3. The island-bridge joint construction method according to claim 2, characterized in that: The auxiliary connector comprises: A suspension beam, both ends of which are connected to the pier pile foundation construction platform and the box beam support respectively, and the installation height of which 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 the 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.

4. 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.

5. The island-bridge joint construction method according to claim 1, characterized in that: In the step of intersecting the riprap slope embankment and the bridge pile foundation pier, when the counter-pressure riprap construction is carried out, a 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 casting construction of Pier No. 1 are: a steel cofferdam for casting construction of Pier No. 1 is built 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.

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, in the first stage of riprap construction, when the riprap top elevation of the riprap slope embankment formed 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 slope embankment formed on the side of the steel cylinder of the island-bridge junction reaches the third design elevation and the top elevation of the riprap slope embankment formed 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.

7. The island-bridge joint construction method according to claim 1, characterized in that: In the step of intersecting 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.

8. 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 except the pile foundation casing is excavated and filled with inverted filter layer. The inverted filter layer is replaced and filled until the designed bottom elevation of Abutment No. 0 is reached, and the pile foundation is poured into the pile foundation casing to form a pile foundation.

9. The island-bridge joint construction method according to claim 8, characterized in that: The steps of intersecting 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 pier are poured after the construction of the No. 0 abutment pile foundation is completed and before the pouring 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 construction of the box girder.

10. The island-bridge joint construction method according to claim 1, characterized in that: In the step of intersecting the riprap slope embankment and the bridge pile foundation pier, 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.

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