Shared suspension support of main bridge side span cast-in-situ beam section and approach bridge bent cap and construction method

Abstract

A kind of main bridge side span cast-in-situ beam section and the shared suspension support of approach bridge bent cap and construction method include bailey beam, bent cap formwork support, cast-in-situ section formwork support, bracket and prestressed cable;Bracket is arranged in the left and right sides of pier column and below cast-in-situ beam section;Bracket top below cast-in-situ beam section is equipped with crossbeam;Bailey beam is installed on the bracket of the left and right sides of pier column and on the crossbeam below cast-in-situ beam section;At the top of bailey beam, distribution beam is arranged along longitudinal direction at intervals;Bent cap formwork support is arranged on the top of distribution beam of the left and right sides of pier column, and the height of bent cap formwork support is adjustable;Prestressed cable has at least two groups, and is arranged between bailey beam and completed bent cap respectively;Cast-in-situ section formwork support is placed on the top of distribution beam below cast-in-situ beam section, and the height of cast-in-situ section formwork support is adjustable.The present application solves the technical problems of traditional construction method, such as high construction cost and risk of cast-in-situ section and bent cap construction, influence on appearance quality of pier column and safety risk in high pier construction.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering construction technology, and specifically relates to a shared suspended support and construction method for the cast-in-place beam segment of the main bridge side span and the cap beam of the approach bridge. Background Technology

[0002] A new cross-river bridge project is underway, with the main bridge spanning 4701.5m in length, including a 420m section crossing the main channel of the Han River. The bridge is a partially cable-stayed bridge (110+200+110)m long. The main bridge piers are designated 22#-25#. The main bridge utilizes a variable cross-section continuous box girder, with the continuous beam structure varying from a single-box, two-cell to a three-cell configuration, featuring variable height and a straight web. The box girder has a top width of 34m and a bottom width of 20m. The beam height varies from 6.65m to 3.45m. Piers 22# and 25# each have a cast-in-place section of the main bridge's side span and an approach bridge side cap beam at their top. Each cast-in-place section of the main bridge's side span is 8.88m long. The piers are arranged in a double rectangular configuration, with each pier having a cross-section of 3.7×6.8m. All foundations are bored pile foundations, with an average pier height of 31m. Due to the long length and heavy weight of the cast-in-place beams (approximately 800 tons) in this project, the piers are relatively tall, and the outer foundation of the piers is small (only 2.65m), making it impossible to form a vertical ground-supported formwork during construction. Therefore, cap beam construction is required on both the pier and approach bridge sides. Conventional cap beam construction often uses pre-embedded external connecting brackets in steel bars and ground-supported supports at the bottom of the cast-in-place beam formwork. This construction method affects the appearance quality of the piers, and the vertical support at the bottom of high piers has poor stability, posing certain safety risks during construction. Therefore, considering the above reasons, a shared support system for the cap beams of the main bridge side and the approach bridge side of this steel structure bridge transition high pier was invented, and the specific construction method was clarified. Summary of the Invention

[0003] The purpose of this invention is to provide a shared suspended support and construction method for the cast-in-place beam segment of the main bridge side span and the cap beam of the approach bridge. This invention aims to solve the technical problems of high construction cost and high risk of traditional construction methods for cast-in-place segments and cap beams, which affect the appearance quality of the piers and pose safety risks in the construction of high piers.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] A shared suspended support for the cast-in-place beam segment of the main bridge side span and the cap beam of the approach bridge is used for concrete pouring construction of the cap beam and the cast-in-place beam segment; the cap beam is set at the top of the pier column, near the front end; the front end of the cast-in-place beam segment overlaps the top of the pier column, near the rear end. The shared suspended support includes Bailey beams, cap beam formwork supports, and cast-in-place section formwork supports; it also includes brackets and prestressed cables; the brackets are arranged on the left and right sides of the pier and below the cast-in-place beam section; threaded anchor bolts are pre-embedded in the upper part of the pier, near the top; the brackets and threaded anchor bolts are detachably connected; a crossbeam is provided on the top of the bracket below the cast-in-place beam section; the Bailey beams are installed on the brackets on the left and right sides of the pier and on the crossbeam below the cast-in-place beam section; distribution beams are arranged longitudinally at intervals on the top of the Bailey beams, each distribution beam being arranged laterally; the cap beam formwork supports are set on the pier. The top of the distribution beams on both sides, and the height of the cap beam formwork support is adjustable; there are at least two sets of prestressed cables, respectively arranged between the Bailey beam and the completed cap beam; the prestressed cables are inclinedly installed between the cap beam and the Bailey beam, with the lower end of the prestressed cable passing through the Bailey beam and anchored at the bottom of the Bailey beam, and the upper end of the prestressed cable passing through the cap beam and anchored at the front end face of the cap beam; in the cap beam, inclined sleeves are pre-embedded at the locations where the prestressed cables pass through; the cast-in-place section formwork support is erected on the top of the distribution beam below the cast-in-place beam section, and the height of the cast-in-place section formwork support is adjustable.

[0006] Preferably, a groove is provided on the top front side of the pier column at the position corresponding to the cap beam; the cap beam is cast in the groove.

[0007] Preferably, a set of brackets is arranged at intervals on each side of the pier; the bracket includes a lower horizontal brace, an upper horizontal brace, and diagonal braces; the lower horizontal brace and the upper horizontal brace are both perpendicular to the side of one side of the pier and are connected to threaded anchor bolts; there are two diagonal braces, which together with the upper horizontal brace form a triangular structure; the lower ends of the two diagonal braces are connected to a point and fixed to the end of the lower horizontal brace.

[0008] Preferably, there is one set of Bailey beams, which are arranged laterally on the brackets on the left and right sides of the pier and on the crossbeam below the cast-in-place beam segment; there are two sets of prestressed cables, one set of prestressed cables is laid laterally between the Bailey beam and the upper part of the completed cap beam, and the other set of prestressed cables is laid laterally between the Bailey beam and the middle part of the completed cap beam.

[0009] Preferably, a connecting plate is provided at the upper part of the pier column, at the position of the upper horizontal brace and the lower horizontal brace of the corresponding bracket; the threaded anchor bolts fix the connecting plate to the pier column; the upper horizontal brace and the lower horizontal brace are respectively fixedly connected to the connecting plate; stiffening plates are provided at the corners between the connecting plate and the upper horizontal brace and at the corners between the connecting plate and the lower horizontal brace.

[0010] Preferably, a first anchoring block is provided on the Bailey beam at the lower end position corresponding to the prestressed cable; the lower end of the prestressed cable is fixed to the first anchoring block, and a first wedge-shaped pad is provided between the end of the prestressed cable and the first anchoring block; a second anchoring block is provided on the front side of the cap beam at the upper end position corresponding to the prestressed cable; the upper end of the prestressed cable is fixed to the second anchoring block, and a second wedge-shaped pad is provided between the end of the prestressed cable and the second anchoring block; the anchoring surfaces of the prestressed cable, the first wedge-shaped pad, and the second wedge-shaped pad are perpendicular to each other.

[0011] Preferably, a connecting steel bar is embedded in the pier cap at the position corresponding to the pier column, and the upper end of the connecting steel bar extends beyond the pier cap and into the pier column.

[0012] A construction method for sharing a suspended support for the cast-in-place beam segment of the main bridge side span and the cap beam of the approach bridge includes the following steps.

[0013] Step 1: Pre-embed threaded anchor bolts during the construction of the pier column.

[0014] Step two: Install brackets on the three sides of the pier.

[0015] Step 3: Install a crossbeam on top of the bracket below the cast-in-place beam segment.

[0016] Step 4: Install Bailey beams on the top of the brackets on the left and right sides of the pier and on the top of the crossbeams.

[0017] Step 5: Construct the distribution beams.

[0018] Step six: Install the formwork support for the cap beam, and erect the construction formwork for the cap beam and tie the reinforcing bars of the cap beam.

[0019] Step 7: Pre-embed inclined sleeves that penetrate the cap beam.

[0020] Step 8: Pour the concrete for the cap beam.

[0021] Step nine: After the cap beam reaches the design strength, install the prestressed cables.

[0022] Step 10: Tension the prestressed cables.

[0023] Step 11: Install the distribution beams and the formwork supports for the cast-in-place section.

[0024] Step 12: Install formwork for the cast-in-place section and tie the reinforcing bars for the cast-in-place beam section.

[0025] Step thirteen: Pour the concrete for the cast-in-place beam segment.

[0026] Step fourteen: After the concrete of the cast-in-place beam segment reaches the design strength, remove the prestressed cables.

[0027] Step 15: Once the shared support system has been dismantled, the construction is complete.

[0028] Preferably, in step nine, when threading the prestressed cable, both ends of the prestressed cable are set perpendicular to the corresponding anchoring surface.

[0029] Compared with the prior art, the present invention has the following features and beneficial effects.

[0030] 1. The technical solution adopted by this invention to solve its technical problems is as follows: After detailed load calculation and structural stress verification, the main bridge side cast-in-place section and the approach bridge side cap beam of this steel structure bridge transition high pier share a support system instead of erecting separate scaffolds for the cast-in-place section and the cap beam. This can realize the use of scaffolds twice in a narrow construction area, improve the utilization rate of scaffolds, and successfully solve the problem of high construction cost and high risk of the cast-in-place section and cap beam of the Hanjiang River Valley Bridge.

[0031] 2. This invention makes full use of the site's terrain and structural form, and reduces the costs of foundation treatment and machinery investment for underwater construction through a shared support design. This significantly saves costs, shortens the construction period, and reduces construction safety risks.

[0032] 3. The shared suspended support of this invention, by employing prestressed cable bearing, avoids the need for support columns beneath the Bailey beam, thereby accelerating construction, saving materials, and reducing costs. Furthermore, because the piers of this invention are relatively high, the suspended support design also avoids the instability issues that cannot be guaranteed by installing tall support columns. Attached Figure Description

[0033] The present invention will now be described in further detail with reference to the accompanying drawings.

[0034] Figure 1 This is a schematic diagram of the structure in this invention where the cap beam and cast-in-place beam segment are set on top of the pier column.

[0035] Figure 2 This is a schematic diagram of the structure in this invention where the cover beam formwork support is set above the bracket.

[0036] Figure 3 This is a side structural diagram of the formwork support for the cast-in-place section erected on top of the distribution beam after the completion of the cap beam construction in this invention.

[0037] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the cast-in-place section formwork support erected on the top of the distribution beam after the completion of the cap beam construction in this invention.

[0038] Figure 5 This is a schematic diagram of the back structure of the cast-in-place section formwork support erected on top of the distribution beam after the completion of the cap beam construction in this invention.

[0039] Figure 6This is a schematic diagram of the structure of the cover beam formwork support supported on the distribution beam in this invention.

[0040] Figure 7 This is a schematic diagram of the connection node structure between the prestressed cable and the Bailey beam in this invention.

[0041] Figure 8 This is a schematic diagram of the connection structure between the bracket and the pier column in this invention.

[0042] Attached reference numerals: 1-Girder cap, 2-Cast-in-place beam segment, 3-Pier column, 4-Bailey beam, 5-Girder cap formwork support, 6-Cast-in-place section formwork support, 7-Bracket, 7.1-Lower horizontal brace, 7.2-Upper horizontal brace, 7.3-Diagonal brace, 7.4-Stiffening plate, 8-Prestressed cable, 10-Threaded anchor bolt, 11-Crossbeam, 12-Distribution beam, 13-Inclined sleeve, 15-Groove, 16-Pile cap, 17-Connecting plate, 18-First anchor block, 19-First wedge-shaped pad, 20-Second anchor block, 22-Second wedge-shaped pad, 24-Operating platform, 25-Guardrail. Detailed Implementation

[0043] like Figure 1-8 As shown, this shared suspended support for the main bridge side span cast-in-place beam segment and the approach bridge cap beam is used for concrete pouring construction of cap beam 1 and cast-in-place beam segment 2. The cap beam 1 is located on the top of the pier 3, near the front end; the front end of the cast-in-place beam segment 2 overlaps the top of the pier 3, near the rear end. The shared suspended support includes Bailey beams 4, cap beam formwork supports 5, and cast-in-place section formwork supports 6; it also includes brackets 7 and prestressed cables 8; the brackets 7 are arranged on the left and right sides of the pier 3 and below the cast-in-place beam section 2; threaded anchor bolts 10 are pre-embedded in the upper part of the pier 3 near the top; the brackets 7 and the threaded anchor bolts 10 are detachably connected; a crossbeam 11 is provided on the top of the brackets 7 below the cast-in-place beam section 2; the Bailey beams 4 are installed on the brackets 7 on the left and right sides of the pier 3 and on the crossbeam 11 below the cast-in-place beam section 2; distribution beams 12 are arranged longitudinally at intervals on the top of the Bailey beams 4, each distribution beam 12 is arranged laterally; the cap beam formwork supports 5 are provided with The distribution beams 12 on both sides of the pier 3 are at the top, and the height of the cap beam formwork support 5 is adjustable; there are at least two sets of prestressed cables 8, which are respectively arranged between the Bailey beam 4 and the completed cap beam 1; the prestressed cables 8 are inclinedly stretched between the cap beam 1 and the Bailey beam 4, with the lower end of the prestressed cable 8 passing through the Bailey beam 4 and anchored at the bottom of the Bailey beam 4, and the upper end of the prestressed cable 8 passing through the cap beam 1 and anchored at the front end face of the cap beam 1; in the cap beam 1, an inclined sleeve 13 is pre-embedded at the part corresponding to the passage of the prestressed cable 8; the cast-in-place section formwork support 6 is erected on the top of the distribution beams 12 below the cast-in-place beam section 2, and the height of the cast-in-place section formwork support 6 is adjustable.

[0044] In this embodiment, a groove 15 is provided on the top front side of the pier 3, corresponding to the position of the cap beam 1; the cap beam 1 is cast in the groove 15.

[0045] In this embodiment, a set of brackets 7 are arranged at intervals on each side of the pier 3; the bracket 7 includes a lower horizontal brace 7.1, an upper horizontal brace 7.2, and a diagonal brace 7.3; the lower horizontal brace 7.1 and the upper horizontal brace 7.2 are both perpendicular to the side of one side of the pier 3 and are connected to the threaded anchor bolt 10; there are two diagonal braces 7.3, which together with the upper horizontal brace 7.2 form a triangular structure; the lower ends of the two diagonal braces 7.3 are connected to a point and fixed to the end of the lower horizontal brace 7.1; a vertical brace 7.5 is provided between the lower horizontal brace 7.1 and the upper horizontal brace 7.2, and between the two diagonal braces 7.3.

[0046] In this embodiment, there is one set of Bailey beams 4, which are arranged laterally on the brackets 7 on the left and right sides of the pier 3 and on the crossbeam 11 below the cast-in-place beam segment 2; there are two sets of prestressed cables 8, one set of prestressed cables 8 is laid laterally between the Bailey beams 4 and the upper part of the completed cap beam 1, and the other set of prestressed cables 8 is laid laterally between the Bailey beams 4 and the middle part of the completed cap beam 1; the length of the Bailey beams 4 located at the top of the brackets 7 on the left and right sides of the pier 3 is greater than the length of the Bailey beams 4 located at the top of the crossbeam 11; each Bailey beam 4 is arranged longitudinally.

[0047] In this embodiment, there are three crossbeams 11, which are arranged at intervals along the longitudinal direction.

[0048] In this embodiment, a connecting plate 17 is provided on the upper part of the pier column 3 at the position of the upper horizontal support 7.2 and the lower horizontal support 7.1 of the bracket 7; the threaded anchor bolt 10 fixes the connecting plate 17 to the pier column 3; the upper horizontal support 7.2 and the lower horizontal support 7.1 are respectively fixedly connected to the connecting plate 17; stiffening plates 7.4 are provided at the corners of the connecting plate 17 and the upper horizontal support 7.2 and at the corners of the connecting plate 17 and the lower horizontal support 7.1.

[0049] In this embodiment, a first anchoring block 18 is provided on the Bailey beam 4 at the lower end position corresponding to the prestressed cable 8; the lower end of the prestressed cable 8 is fixed on the first anchoring block 18, and a first wedge-shaped pad 19 is provided between the end of the prestressed cable 8 and the first anchoring block 18; a second anchoring block 20 is provided on the front side of the cap beam 1 at the upper end position corresponding to the prestressed cable 8; the upper end of the prestressed cable 8 is fixed on the second anchoring block 20, and a second wedge-shaped pad 22 is provided between the end of the prestressed cable 8 and the second anchoring block 20; the anchoring surfaces of the prestressed cable 8, the first wedge-shaped pad 19, and the second wedge-shaped pad 22 are perpendicular to each other.

[0050] In this embodiment, a connecting steel bar is embedded in the foundation 16 at the position corresponding to the pier column 3, and the upper end of the connecting steel bar extends beyond the foundation 16 and into the pier column 3.

[0051] The construction method for sharing suspended supports between the cast-in-place beams of the main bridge side spans and the cap beams of the approach bridge includes the following steps.

[0052] Step 1: During the construction of pier 3, pre-embed threaded anchor bolts 10.

[0053] Step 2: Install brackets 7 on the three sides of the pier 3 respectively.

[0054] Step 3: Install the crossbeam 11 on top of the bracket 7 below the cast-in-place beam segment 2.

[0055] Step 4: Install Bailey beams 4 on the top of brackets 7 on the left and right sides of pier 3 and on the top of crossbeams 11.

[0056] Step 5: Construct distribution beam 12.

[0057] Step 6: Install the cap beam formwork support 5, and erect the cap beam construction formwork and tie the reinforcing bars of cap beam 1.

[0058] Step 7: Pre-embed the inclined sleeve 13 that penetrates the cap beam 1.

[0059] Step 8: Pour the concrete for the cap beam.

[0060] Step 9: After the cap beam 1 reaches the design strength, install the prestressed cables 8.

[0061] Step 10: Tension the prestressed cable 8.

[0062] Step 11: Install the distribution beam 12 and the cast-in-place section formwork support 6.

[0063] Step 12: Install formwork for the cast-in-place section and tie the reinforcing bars for cast-in-place beam section 2.

[0064] Step thirteen: Pour concrete for cast-in-place beam segment 2.

[0065] Step fourteen: After the concrete of cast-in-place beam segment 2 reaches the design strength, remove the prestressed cable 8.

[0066] Step 15: Once the shared support system has been dismantled, the construction is complete.

[0067] In this embodiment, when threading the prestressed cable 8 in step ten, both ends of the prestressed cable 8 are set perpendicular to the corresponding anchoring surface.

[0068] In this embodiment, the main bridge is a steel structure bridge, and cast-in-place box girder segments are used as approach bridges at both ends of the steel structure bridge.

[0069] In this embodiment, the top of the bracket 7 located below the cast-in-place beam segment 2 is lower than the top of the brackets 7 on the left and right sides of the pier column; the top surface of the crossbeam 11 is flush with the top of the brackets 7 on the left and right sides.

[0070] In this embodiment, the top surface of the cap beam formwork support 5 is an inclined surface that adapts to the bottom surfaces on both sides of the cap beam 1, and the outer end of the cap beam formwork support 5 extends beyond the end of the cap beam 1 on the corresponding side; the part of the cap beam formwork support 5 that extends beyond the end of the cap beam 1 forms an operating platform 24; a guardrail 25 is provided around the outer edge of the operating platform 24.

[0071] In this embodiment, the pre-embedding of precision-rolled threaded anchor bolts 10 is carried out during the construction of pier column 3 and foundation 16. At the same time, small rods are assembled on land. After the assembly is completed, they are lifted by crane. The main wall tie beam is installed first to form the lower support force system. After the lower support system is fully installed, the upper crossbeam 11, Bailey beam 4, and distribution beam 12 are installed in sequence. Then, the pre-stressing of the cap beam side support system is carried out. After the pre-stressing is qualified, the cap beam side concrete is poured. After the curing strength reaches the requirements, the prestressed cables 8 are installed, and the cast-in-place box girder position adjustment formwork support 6 is erected. Finally, the fixed steel formwork of the cast-in-place beam segment 2 is laid. After the entire system is fully installed, the pre-stressing of the cast-in-place box girder side support is carried out. After the pre-stressing is qualified, the cast-in-place box girder reinforcement is tied and the concrete is poured. At this time, the weight of the concrete at the top of the cap beam side support can be used as a safety reserve to prevent the support from tilting forward. Finally, the prestressing system is tensioned and grouted. After the grouting strength reaches the requirements, the support system is removed.

[0072] The above embodiments are not exhaustive examples of specific implementation methods, and other embodiments are also possible. The purpose of the above embodiments is to illustrate the present invention, rather than to limit the scope of protection of the present invention. All applications derived from simple variations of the present invention fall within the scope of protection of the present invention.

Claims

1. A shared suspended support for the cast-in-place beam segment of the main bridge side span and the cap beam of the approach bridge, used for concrete pouring construction of the cap beam (1) and the cast-in-place beam segment (2); the cap beam (1) is set on the top of the pier (3) and near the front end of the pier (3); the front end of the cast-in-place beam segment (2) overlaps the top of the pier (3) and is near the rear end of the pier (3); The shared suspended support includes a Bailey beam (4), a cap beam formwork support (5), and a cast-in-place section formwork support (6); its characteristic is that: It also includes brackets (7) and prestressed cables (8); the brackets (7) are arranged on the left and right sides of the pier (3) and below the cast-in-place beam segment (2); threaded anchor bolts (10) are pre-embedded on the upper part of the pier (3) and near the top of the pier (3); the brackets (7) and the threaded anchor bolts (10) are detachably connected; a crossbeam (11) is provided on the top of the brackets (7) below the cast-in-place beam segment (2); the Bailey beam (4) is installed on the brackets (7) on the left and right sides of the pier (3) and on the crossbeam (11) below the cast-in-place beam segment (2); distribution beams (12) are arranged at intervals on the top of the Bailey beam (4) and along the longitudinal direction of the Bailey beam (4), each distribution beam (12) is arranged laterally; the cap beam formwork support (5) is set on the left and right sides of the pier (3) The distribution beam (12) is at the top, and the height of the cap beam formwork support (5) is adjustable; there are at least two sets of prestressed cables (8), which are respectively arranged between the Bailey beam (4) and the completed cap beam (1); the prestressed cables (8) are inclined and laid between the cap beam (1) and the Bailey beam (4), the lower end of the prestressed cables (8) passes through the Bailey beam (4) and is anchored at the bottom of the Bailey beam (4), and the upper end of the prestressed cables (8) passes through the cap beam (1) and is anchored at the front end face of the cap beam (1); an inclined sleeve (13) is pre-embedded in the cap beam (1) and at the location where the prestressed cables (8) pass through; the cast-in-place section formwork support (6) is erected on the top of the distribution beam (12) below the cast-in-place beam section (2), and the height of the cast-in-place section formwork support (6) is adjustable.

2. The shared cantilever support for the main bridge side span cast-in-place beam segment and the approach bridge cap beam as described in claim 1, characterized in that: A groove (15) is provided on the top front side of the pier (3) at the position corresponding to the cap beam (1); the cap beam (1) is cast in the groove (15).

3. The shared cantilever support for the main bridge side span cast-in-place beam segment and the approach bridge cap beam as described in claim 1, characterized in that: The bracket (7) is arranged in a set at intervals on each side of the pier (3); the bracket (7) includes a lower horizontal brace (7.1), an upper horizontal brace (7.2) and a diagonal brace (7.3); the lower horizontal brace (7.1) and the upper horizontal brace (7.2) are both perpendicular to the side of the pier (3) and are connected to the threaded anchor bolt (10); there are two diagonal braces (7.3), and the two diagonal braces (7.3) together with the upper horizontal brace (7.2) form a triangular structure; the lower ends of the two diagonal braces (7.3) are connected to a point and fixed to the end of the lower horizontal brace (7.1).

4. The shared cantilever support for the main bridge side span cast-in-place beam segment and the approach bridge cap beam as described in claim 1, characterized in that: The Bailey beam (4) has one set, which is arranged laterally on the brackets (7) on the left and right sides of the pier (3) and on the crossbeam (11) below the cast-in-place beam segment (2); the prestressed cables (8) have two sets, one set of prestressed cables (8) is laid laterally between the Bailey beam (4) and the upper part of the completed cap beam (1), and the other set of prestressed cables (8) is laid laterally between the Bailey beam (4) and the middle part of the completed cap beam (1).

5. The shared cantilever support for the cast-in-place beam segment of the main bridge side span and the approach bridge cap beam as described in claim 2, characterized in that: A connecting plate (17) is provided on the upper part of the pier (3) and at the position of the upper horizontal brace (7.2) and lower horizontal brace (7.1) of the bracket (7); the threaded anchor bolt (10) fixes the connecting plate (17) to the pier (3); the upper horizontal brace (7.2) and lower horizontal brace (7.1) are fixedly connected to the connecting plate (17) respectively; stiffening plates (7.4) are provided at the corners of the connecting plate (17) and the upper horizontal brace (7.2) and at the corners of the connecting plate (17) and the lower horizontal brace (7.1).

6. The shared cantilever support for the main bridge side span cast-in-place beam segment and the approach bridge cap beam as described in claim 1, characterized in that: A first anchor block (18) is provided on the Bailey beam (4) at the lower end of the prestressed cable (8); the lower end of the prestressed cable (8) is fixed on the first anchor block (18), and a first wedge-shaped pad (19) is provided between the end of the prestressed cable (8) and the first anchor block (18); a second anchor block (20) is provided on the front side of the cap beam (1) at the upper end of the prestressed cable (8); the upper end of the prestressed cable (8) is fixed on the second anchor block (20), and a second wedge-shaped pad (22) is provided between the end of the prestressed cable (8) and the second anchor block (20); the anchoring surfaces of the prestressed cable (8) and the first wedge-shaped pad (19) and the second wedge-shaped pad (22) are perpendicular.

7. The shared cantilever support for the main bridge side span cast-in-place beam segment and the approach bridge cap beam as described in claim 1, characterized in that: A foundation (16) is provided at the bottom of the pier (3); a connecting steel bar is embedded in the foundation (16) at the position corresponding to the pier (3), and the upper end of the connecting steel bar extends beyond the foundation (16) and into the pier (3).

8. A construction method for a shared suspended support for the cast-in-place beam segment of the main bridge side span and the cap beam of the approach bridge as described in claims 1-7, characterized in that, The steps include the following: Step 1: During the construction of the pier column (3), the threaded anchor bolts (10) are pre-embedded; Step 2: Install brackets (7) on the three sides of the pier (3); Step 3: Install the crossbeam (11) on top of the bracket (7) below the cast-in-place beam segment (2); Step 4: Install Bailey beams (4) on the top of brackets (7) on the left and right sides of the pier (3) and on the top of crossbeams (11). Step 5: Construct the distribution beam (12); Step 6: Install the cap beam formwork support (5), and erect the cap beam construction formwork and tie the reinforcing bars of the cap beam (1); Step 7: Pre-embed the inclined sleeve (13) through the cap beam (1). Step 8: Pour the concrete for the cap beam; Step 9: After the cap beam (1) reaches the design strength, prestressed cables (8) are installed. Step 10: Tension the prestressed cable (8); Step 11: Install the distribution beam (12) and the formwork support for the cast-in-place section (6); Step 12: Install formwork for the cast-in-place section and tie the reinforcing bars of the cast-in-place beam section (2); Step thirteen: Pour concrete for cast-in-place beam segment (2); Step 14: After the concrete of the cast-in-place beam segment (2) reaches the design strength, remove the prestressed cables (8). Step 15: Once the shared support system has been dismantled, the construction is complete.

9. The construction method for the shared cantilever support of the main bridge side span cast-in-place beam segment and the approach bridge cap beam according to claim 8, characterized in that: When threading the prestressed cable (8) in step ten, make sure that both ends of the prestressed cable (8) are perpendicular to the corresponding anchoring surface.

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