Pi-shaped beam rear supporting point hanging basket of ultra-wide variable-width PC cable-stayed bridge

Abstract

The utility model discloses a rear fulcrum hanging basket for a pi-shaped beam of an ultra-wide and variable-width PC cable-stayed bridge, which comprises a main truss system and a bottom basket system, the bottom basket system is integrally arranged below the main truss system, and the main truss system is connected with the bottom basket system and the pi-shaped beam through an anchoring suspension system; the main truss system comprises a main truss; the middle lower cross beam is arranged below the main truss and is detachably connected with the main truss, a movable cushion block is arranged below the middle lower cross beam, and the middle lower cross beam can linearly move in the width direction of the pi-shaped beam; the rear fulcrum hanging basket further comprises a walking system, and the walking system can drive the main truss to move in the length direction of the pi-shaped beam so that the bottom basket system can linearly move along with the main truss. According to the utility model, the position and the size of the counter-force of the supporting point of the hanging basket are adjusted, so that the active control on the stress of the main beam is achieved, and the safety risk during the construction of the ultra-wide main beam of the PC cable-stayed bridge is avoided.

Description

Technical Field

[0001] The utility model relates to the field of bridge construction, in particular to a rear fulcrum hanging basket for a π-shaped beam of an extra-wide variable-width PC cable-stayed bridge. Background Art

[0002] A PC cable-stayed bridge is a bridge using a prestressed concrete structure. The deck load is transmitted to the bridge pier through the stay cables. The π-shaped beam is a beam type commonly used in PC cable-stayed bridges, and its cross-sectional shape presents a "π" shape.

[0003] At present, the front fulcrum hanging basket structure form is adopted for PC cable-stayed bridges in China. The construction steps of the front fulcrum hanging basket are more, the hanging basket platform is longer and the self-weight is large. There are problems such as difficulties in erecting the construction formwork, complex construction technology and force system conversion of the stay cable hanging system, and the process is complex and the construction speed is slow because the hanging basket needs to be connected by stay cables.

[0004] Although the rear fulcrum hanging basket in the prior art can effectively avoid the above problems, the construction method of the rear fulcrum hanging basket for PC cable-stayed bridges has not been applied and popularized at present. At the same time, the existing rear fulcrum hanging basket also has the following problems: due to the large self-weight of the π-shaped beam of the extra-wide variable-width PC cable-stayed bridge, the bearing capacity of the two large longitudinal ribs on both sides is relatively strong, and the bearing capacity in the middle is relatively weak. The reaction force position of the main truss fulcrum of the conventional hanging basket cannot be adjusted, which will cause the reaction force of the fulcrum to exceed the limit when the bridge deck becomes wider. Summary of the Utility Model

[0005] Therefore, in order to solve the above deficiencies, on the one hand, the utility model provides a rear fulcrum hanging basket for a π-shaped beam of an extra-wide variable-width PC cable-stayed bridge, which includes a main truss system and a bottom basket system. The bottom basket system is integrally arranged below the main truss system, and the main truss system is connected to the bottom basket system and the π-shaped beam through an anchoring suspension system;

[0006] The main truss system includes

[0007] a main truss, the main truss is perpendicular to the π-shaped beam as a whole, and the main truss is arranged parallel to the length direction of the π-shaped beam. There are two groups of the main trusses, and the two groups of the main trusses are oppositely arranged on both sides above the π-shaped beam; and

[0008] a middle and lower cross beam, which is arranged below the main truss and removably connected to the main truss. The middle and lower cross beam is arranged parallel to the width direction of the π-shaped beam. A movable cushion block is arranged below the middle and lower cross beam, and the middle and lower cross beam can linearly move along the width direction of the π-shaped beam to adjust the width of a single group of the main trusses;

[0009] The rear fulcrum hanging basket further includes a traveling system, and the traveling system can drive the main truss to move along the length direction of the π-shaped beam so that the bottom basket system moves linearly accordingly.

[0010] A movable cushion block is arranged below the middle and lower cross beams of the main truss and is removably connected to the main longitudinal beam above. When the width of the main beam needs to be adjusted and the position of the support pad needs to be adjusted, the bolts between the middle and lower cross beams and the main longitudinal beam are removed. After the middle and lower cross beams are moved in place towards the side truss, the bolts are pre-tightened, and then the position of the support pad is re-adjusted according to the calculation. Thus, the adjustment of the position and magnitude of the reaction force of the hanging basket support point is realized, so as to achieve the active control of the force of the main beam and avoid the safety risks during the construction of the ultra-wide main beam of the PC cable-stayed bridge.

[0011] Further, each group of the main trusses includes two groups of triangular trusses arranged in parallel, and the two groups of triangular trusses are connected by a main truss connecting frame;

[0012] The triangular truss includes

[0013] A main longitudinal beam, the main longitudinal beam is arranged horizontally as a whole and is parallel to the length direction of the π-shaped beam, and the main longitudinal beam is removably connected to the above-mentioned middle and lower cross beams; and

[0014] A truss vertical rod, the truss vertical rod is arranged vertically as a whole, the bottom end of the truss vertical rod is fixedly connected to the middle part of the above-mentioned main longitudinal beam, and the top end of the truss vertical rod is connected to both ends of the main longitudinal beam through an inclined rod;

[0015] The main truss further includes a main upper cross beam, the main upper cross beam is fixed on the upper surface of one end of the above-mentioned main longitudinal beam, and the main upper cross beam is connected to the bottom basket system through an anchoring suspension system.

[0016] Taking the triangular main truss as the main load-bearing structure of the main truss system makes the structure of the entire main truss system more stable.

[0017] Further, the two groups of main trusses are connected by a main truss transverse tie rod.

[0018] The utility model forms an integral body of the two groups of main trusses through the main truss transverse tie rod, thereby avoiding excessive force during the walking of the hanging basket or overturning to both sides due to eccentric load during pouring.

[0019] Further, the main truss further includes two groups of walking hanging brackets arranged outside the main truss, the walking hanging brackets are cantilevered and extend to the outside of the main truss, and the walking hanging brackets are connected to the bottom basket system through the above-mentioned anchoring suspension system.

[0020] The above-mentioned walking hanging brackets are connected to the bottom basket system through walking side suspension rods, and the load of the bottom basket system is transmitted to the hanging brackets by using the walking side suspension rods, and finally the main truss structure is stressed. At the same time, during the walking process, by alternately using the two hanging brackets, the problem that the hanging brackets and tie rods may intersect with the stay cables 700 in space and cause difficulties in the walking of the hanging basket is solved.

[0021] Further, the bottom basket system includes

[0022] A front crossbeam frame, which is connected to the above-mentioned main upper crossbeam through an anchoring suspension system; and

[0023] A rear crossbeam frame, which is arranged parallel to the above-mentioned front crossbeam frame, is connected to the above-mentioned walking hanging frame through an anchoring suspension system, and the rear crossbeam frame is kept connected to the front crossbeam frame through a crossbeam frame connection system.

[0024] Furthermore, the front crossbeam frame includes

[0025] A front upper chord, which is arranged in a single group; and

[0026] A front lower chord, which is provided with two groups and is arranged parallel to the front upper chord on both sides below the front upper chord. The two groups of front lower chords are connected to the above-mentioned front upper chord through a first web member to form a triangular-structured front upper crossbeam frame.

[0027] Furthermore, the front crossbeam frame further includes

[0028] A truss horizontal member, which is arranged parallel to the front lower chord and below the front lower chord;

[0029] A truss vertical member, which is arranged vertically between the above-mentioned truss horizontal member and the front lower chord, and the truss horizontal member and the front lower chord are fixedly connected through the truss vertical member; and

[0030] A truss diagonal member, one end of which is fixedly connected to the truss horizontal member, and the other end extends obliquely upward outside the truss horizontal member and is connected to the front lower chord;

[0031] The truss horizontal member, the truss vertical member, the truss diagonal member and the above-mentioned front lower chord form a trapezoidal truss.

[0032] Designing the bottom basket into a truss structure can avoid excessive deflection caused by the large width of the front and rear lower crossbeams of the hanging basket. A trapezoidal truss is arranged below the front lower crossbeam to balance the large bending moment and deflection caused by the width, making the hanging basket structure tend to a stable state. The front and rear crossbeam frames are connected through a crossbeam frame connection system, and the bottom basket system is connected into a whole to improve the structural stability. At the same time, a formwork truss platform can be placed on the upper part of the crossbeam frame connection system for the erection and installation of formwork and to bear the construction pouring load.

[0033] Furthermore, the rear crossbeam frame includes

[0034] A rear upper chord, both ends of which are locally linearly lowered; and

[0035] A rear lower chord, which is connected to the above-mentioned rear upper chord through a second web member to form a single-plane truss structure.

[0036] When used in conjunction with the above-mentioned front crossbeam frame, the deflection can be reduced.

[0037] Furthermore, the traveling system includes

[0038] a bracket, which is anchored above the π-shaped beam, and the main longitudinal beam is partially fitted into the bracket; and

[0039] a propulsion system, which is connected to the above-mentioned bracket and the reaction seat arranged at the end of the main longitudinal beam, and the main truss system is pushed to travel through this propulsion system.

[0040] On the other hand, the present utility model relates to a construction method for a hanging basket at the rear fulcrum of a π-shaped beam of an ultra-wide variable-width PC cable-stayed bridge. This method uses the above-mentioned hanging basket at the rear fulcrum of a π-shaped beam of an ultra-wide variable-width PC cable-stayed bridge, and the method includes

[0041] Press the rear anchor beam on the upper end of the main longitudinal beam, pass the rear anchor rod into the reserved holes of the rear anchor beam and the main beam for anchoring;

[0042] Connect the front side of the bottom basket to the front side of the above-mentioned main truss system with 4 front suspension straps, pass 8 rear suspension rods into the reserved holes of the main beam and then anchor them on the main beam;

[0043] Anchor the bracket above the main beam so that it wraps the main longitudinal beam partially, and set a reaction seat at the end of the main longitudinal beam. Lock and fix the propulsion system to the above-mentioned reaction seat and bracket to complete the construction of the hanging basket. There are two sets of front and rear of the propulsion system;

[0044] After the current stage of pouring is completed, install the traveling front suspension rod on the front upper crossbeam and the front crossbeam frame, install the traveling side suspension rod on the traveling hanger and the rear crossbeam frame. After the installation of the traveling suspension rod is completed, disconnect the steel suspension strap;

[0045] After moving the formwork away from the beam body by a preset distance, the propulsion system operates to push the entire hanging basket forward towards the beam body;

[0046] After the hanging basket travels a preset distance, the formwork is reset, the steel suspension strap connection is restored, and the traveling suspension rod is removed;

[0047] When the width of the beam body becomes wider, disconnect the connection between the middle and lower crossbeams and the main longitudinal beam. After the middle and lower crossbeams move outward in place, pre-tighten the bolts, and then re-adjust the fulcrum position according to the calculation.

[0048] The present utility model has the following advantages:

[0049] A movable cushion block is arranged below the middle and lower cross beams of the main truss and is removably connected to the main longitudinal beam above. When the width of the main beam needs to be adjusted and the support position needs to be changed, the bolts between the middle and lower cross beams and the main longitudinal beam are removed. After the middle and lower cross beams are moved to the side truss and in place, the bolts are pre-tightened, and then the support position is readjusted according to the calculation. Thus, the adjustment of the position and magnitude of the reaction force of the hanging basket support is realized, so as to actively control the force of the main beam and avoid the safety risks during the construction of the super-wide main beam of the PC cable-stayed bridge.

[0050] The above-mentioned walking hanger is connected to the bottom basket system through the walking side suspension rod. The load of the bottom basket system is transmitted to the hanger by the walking side suspension rod, and finally the main truss structure is stressed. At the same time, during the walking process, by alternately using the two hangers, the problem that the hanger and the tie rod may intersect with the stay cable in space, resulting in difficult walking of the hanging basket, is solved.

[0051] The bottom basket is designed as a truss structure, which can avoid excessive deflection caused by the large width of the front and rear lower cross beams of the hanging basket. A trapezoidal truss is arranged below the front lower cross beam to balance the large bending moment and deflection caused by the width, so that the structure of the hanging basket tends to be stable. The front and rear cross beam frames are connected by the cross beam frame connection system, and the bottom basket system is connected into a whole to improve the structural stability. At the same time, a formwork truss platform can be placed on the upper part of the cross beam frame connection system for the erection and installation of the formwork and to bear the construction pouring load. Description of the Drawings

[0052] Figure 1 is the structural schematic diagram of the hanging basket;

[0053] Figure 2 is Figure 1 the front view of the hanging basket shown;

[0054] Figure 3 is Figure 1 the side view of the hanging basket shown;

[0055] Figure 4 is Figure 1 the structural schematic diagram of the main truss system in the hanging basket shown;

[0056] Figure 5 is Figure 4 the structural schematic diagram of the main truss in the main truss system shown;

[0057] Figure 6 is Figure 5 the side view of the main truss in the main truss system shown;

[0058] Figure 7 is Figure 5 the front view of the main truss shown;

[0059] Figure 8 is the schematic diagram of the support adjustment after the widening of the main beam;

[0060] Figure 9 It is a schematic diagram of the alternative use of a walking hanging basket;

[0061] Figure 10 It is Figure 1 a schematic structural diagram of the bottom basket system in the hanging basket shown;

[0062] Figure 11 It is Figure 10 a schematic structural diagram of the front crossbeam frame in the bottom basket system shown;

[0063] Figure 12 It is Figure 11 a side view of the front crossbeam frame shown;

[0064] Figure 13 It is Figure 10 a schematic structural diagram of the rear crossbeam frame in the bottom basket system shown;

[0065] Figure 14 It is Figure 11 a schematic diagram of the cooperation between the rear crossbeam frame shown and the beam body. Detailed implementation manners

[0066] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as a limitation of the present application.

[0067] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0068] As described in the background art, due to the relatively large self-weight of the π-shaped beam of the ultra-wide variable-width PC cable-stayed bridge, it has the characteristics that the bearing capacity of the large longitudinal ribs on both sides is relatively strong and the bearing capacity in the middle is relatively weak. However, the position of the reaction force of the main truss fulcrum of the conventional hanging basket cannot be adjusted, which will cause the reaction force of the fulcrum to exceed the limit when the bridge deck becomes wider.

[0069] Embodiment 1:

[0070] Therefore, in order to solve the above technical problems existing in the prior art, this embodiment provides a rear fulcrum hanging basket for the π-shaped beam of an ultra-wide variable-width PC cable-stayed bridge, as Figures 1 - 3As shown, the hanging basket includes a main truss system 200 and a bottom basket system 300. The bottom basket system 300 is integrally arranged below the main truss system 200. The main truss system is connected to the bottom basket system and the π-shaped beam through an anchoring suspension system 400.

[0071] As Figure 4 , 5 shown, the main truss system 200 includes

[0072] main trusses 210. The main trusses 210 are integrally perpendicular to the π-shaped beam and are arranged parallel to the length direction of the π-shaped beam. There are two groups of the main trusses 210, and the two groups of main trusses are oppositely arranged on both sides above the π-shaped beam 100; and

[0073] a middle and lower cross beam 230. The middle and lower cross beam 230 is arranged below the above-mentioned main trusses 210 and is removably connected to the above-mentioned main trusses 210. The middle and lower cross beam 230 is arranged parallel to the width direction of the π-shaped beam. A movable cushion block is arranged below the middle and lower cross beam, and the middle and lower cross beam can linearly move along the width direction of the above-mentioned π-shaped beam to adjust the width of a single group of the main trusses;

[0074] The rear fulcrum hanging basket further includes a traveling system 500. The traveling system 500 can drive the above-mentioned main trusses 210 to move along the length direction of the π-shaped beam, so that the bottom basket system 300 moves linearly accordingly.

[0075] In the present utility model, by arranging a movable cushion block below the middle and lower cross beam of the main truss and removably connecting the upper part to the main longitudinal beam, when the position of the support needs to be adjusted due to the widening of the main beam, as Figure 8 shown, the bolts between the middle and lower cross beam and the main longitudinal beam are removed. After the middle and lower cross beam moves in place towards the side truss, the bolts are pre-tightened, and then the position of the support cushion is readjusted according to the calculation. Thus, the adjustment of the position and magnitude of the reaction force of the fulcrum of the hanging basket is realized, so as to achieve the active control of the force of the main beam and avoid the safety risks during the construction of the super-wide main beam of the PC cable-stayed bridge.

[0076] In this embodiment, the above-mentioned removable connection can be realized by using high-strength bolts.

[0077] In this embodiment, as Figure 6 , 7 shown, each group of the main trusses 210 includes two groups of triangular trusses arranged in parallel, and the two groups of triangular trusses are connected by a main truss connecting frame 216;

[0078] The triangular truss includes

[0079] a main longitudinal beam 213. The main longitudinal beam 213 is integrally horizontally arranged and is arranged parallel to the length direction of the π-shaped beam. The main longitudinal beam 213 is removably connected to the above-mentioned middle and lower cross beam 230;

[0080] The truss vertical rod 211 is vertically arranged as a whole. The bottom end of the truss vertical rod 211 is fixedly connected to the middle part of the main longitudinal beam, and the top end of the truss vertical rod is connected to both ends of the main longitudinal beam through the inclined rod 212.

[0081] The main truss further includes a main upper cross beam 214, which is fixed on the upper surface of one end of the main longitudinal beam 213. The main upper cross beam 214 is connected to the bottom basket system 300 through an anchoring suspension system.

[0082] Taking the triangular main truss as the main load-bearing structure of the main truss system makes the structure of the entire main truss system more stable. In this embodiment, the top of the truss vertical rod can be connected to the front inclined rod 110 and the rear inclined rod 111 through a pin shaft.

[0083] In this embodiment, as Figure 4 shown, two groups of the main trusses 210 are connected by a main truss transverse tie rod 220. The two groups of main trusses are formed into a whole through the main truss transverse tie rod, so as to avoid excessive force during the walking of the hanging basket or overturning to both sides due to eccentric load during pouring.

[0084] In addition, in order to facilitate the movement of construction workers, a climbing system 700 can be arranged on the main truss system, and a walkway system 600 can be arranged on the main truss system and the bottom basket system.

[0085] Embodiment 2:

[0086] Due to the connection between the stay cable and the beam body, during the walking process, the anchoring suspension system may intersect with the stay cable in space, resulting in difficult walking of the hanging basket.

[0087] Therefore, in order to solve the above technical problems, this embodiment is improved based on Embodiment 1. As Figure 7 shown, different from Embodiment 1, the main truss 210 further includes two groups of walking hanging brackets 215 arranged outside the main truss 210. The walking hanging brackets project and extend outside the main truss, and the walking hanging brackets are connected to the bottom basket system through the above-mentioned anchoring suspension system.

[0088] The above-mentioned walking hanging bracket is connected to the bottom basket system through the walking side suspension rod. The load of the bottom basket system is transmitted to the hanging bracket by using the walking side suspension rod 303, and finally the main truss structure is stressed. At the same time, as Figure 9 shown, during the walking process, by alternately using the two hanging brackets, the problem that the hanging bracket and the tie rod may intersect with the stay cable in space and cause difficult walking of the hanging basket is solved.

[0089] Embodiment 3:

[0090] During the construction of the hanging basket for an extra-wide PC cable-stayed bridge, excessive deflection deformation at the front side of the bottom basket system will pose a greater construction risk to the main girder.

[0091] Therefore, to solve this technical problem, this embodiment is proposed based on the above embodiment for improvement. As Figure 10 shown, different from the above embodiment, the bottom basket system 300 in this embodiment includes

[0092] a front crossbeam frame 310, which is connected to the above-mentioned main upper crossbeam 214 through an anchoring suspension system; and

[0093] a rear crossbeam frame 330, which is arranged parallel to the above-mentioned front crossbeam frame 310, is connected to the above-mentioned traveling hanging frame through an anchoring suspension system, and the rear crossbeam frame 330 is kept connected to the front crossbeam frame through a crossbeam frame connection system 320.

[0094] As Figure 11 、 12 shown, the front crossbeam frame 310 includes

[0095] a front upper chord 311, which is set in a single group; and

[0096] a front lower chord 312, with two groups of the front lower chords 312 arranged parallel to the front upper chord 311 on both sides below the front upper chord, and the two groups of front lower chords 312 are connected to the above-mentioned front upper chord 311 through the first web members 314 to form a triangular-structured front upper crossbeam frame.

[0097] As Figure 12 shown, the front crossbeam frame 310 further includes

[0098] a truss horizontal bar 313, which is arranged parallel to the front lower chord 312 below the front lower chord;

[0099] a truss vertical bar 315, which is vertically arranged between the truss horizontal bar and the front lower chord, and the truss horizontal bar and the front lower chord are fixedly connected through the truss vertical bar 315; and

[0100] a truss diagonal bar 313, one end of which is fixedly connected to the truss horizontal bar, and the other end extends obliquely upward outside the truss horizontal bar and is connected to the front lower chord;

[0101] The truss horizontal bar, the truss vertical bar, the truss diagonal bar and the above-mentioned front lower chord form a trapezoidal truss.

[0102] As Figure 13 shown, the rear crossbeam frame includes

[0103] The rear upper chord 331, with both ends of the rear upper chord being locally linearly lowered; and

[0104] The rear lower chord 332, and the rear lower chord 322 is connected to the above-mentioned rear upper chord 331 through the second web member 333 to form a single-plane truss structure.

[0105] In this embodiment, by designing the bottom basket into a truss structure, it is possible to avoid excessive deflection caused by the large width of the front and rear lower crossbeams of the hanging basket. A trapezoidal truss is arranged below the front lower crossbeam to balance the large bending moment and deflection caused by the width, making the hanging basket structure tend to a stable state. The front and rear crossbeam frames are connected by the crossbeam frame connection system, and the bottom basket system is connected into a whole to improve the structural stability.

[0106] To improve reusability, both the front and rear crossbeam frames are composed of 6 single-frame bodies connected by pin shafts. In addition, as Figure 14 shown, the rear upper chord 203 of the rear crossbeam frame has the characteristic of being locally linearly lowered on both sides of the beam body, aiming to facilitate the installation of the lower anchor block of the PC cable-stayed bridge body.

[0107] In this embodiment, the above-mentioned crossbeam frame connection system includes

[0108] The platform longitudinal beam, which is distributed on the upper parts of the front and rear crossbeam frames at the designed spacing, aiming to place the formwork truss platform on the upper part for the erection and installation of the formwork 800 and bear the construction pouring load; and

[0109] The longitudinal beam truss, which is respectively placed on both sides and in the middle between the front and rear crossbeam frames, mainly used for longitudinally connecting the front and rear crossbeam frames, connecting the bottom basket system into a whole, and improving the structural stability.

[0110] Embodiment 4:

[0111] This embodiment herein proposes a structure of a traveling system. In this embodiment, the traveling system 500 includes

[0112] The bracket, which is anchored above the π-shaped beam, and a part of the main longitudinal beam is fitted into the bracket; and

[0113] The propulsion system, which is connected to the above-mentioned bracket and the reaction seat arranged at the end of the main longitudinal beam, and the main truss system is pushed to travel through this propulsion system.

[0114] The above-mentioned bracket can be arranged in front of and behind the main longitudinal beam. The propulsion system can be composed of precision rolled threaded steel and jacks. The bracket is anchored above the main beam, and a reaction seat is arranged at the end of the main longitudinal beam. The precision rolled threaded steel is passed through and locked in front of the front bracket, and then the jack at the reaction seat is jacked up to realize the traveling of the hanging basket. In addition, front and rear jacks can also be set on a single set of triangular trusses to ensure that the hanging basket can move forward and backward.

[0115] Example 5:

[0116] In this example, a construction method for the rear fulcrum hanging basket of the π-shaped beam of an extra-wide variable-width PC cable-stayed bridge is provided. This method uses the above-mentioned rear fulcrum hanging basket of the π-shaped beam of the extra-wide variable-width PC cable-stayed bridge, and the method includes

[0117] Press the rear anchor beam on the upper end of the main longitudinal beam, and pass the rear anchor rod into the reserved holes of the rear anchor beam and the main beam for anchoring;

[0118] Connect the front side of the bottom basket to the front side of the above main truss system with 4 front suspension straps, and pass 8 rear suspension rods into the reserved holes of the main beam and then anchor them on the main beam;

[0119] Anchor the bracket above the main beam so that it wraps part of the main longitudinal beam, and set a reaction seat at the end of the main longitudinal beam. Lock and fix the propulsion system to the above reaction seat and bracket to complete the construction of the hanging basket. There are two groups of front and rear propulsion systems;

[0120] After the current stage of pouring is completed, install the front walking suspension rod on the front upper cross beam and the front cross beam frame, and install the side walking suspension rod on the walking hanging frame and the rear cross beam frame. After the installation of the walking suspension rod is completed, release the connection of the steel suspension strap;

[0121] After the formwork moves away from the beam body by a preset distance, the propulsion system operates to push the entire hanging basket forward towards the beam body;

[0122] After the hanging basket walks a preset distance, the formwork is reset, the connection of the rigid suspension strap is restored, and the walking suspension rod is removed;

[0123] As Figure 8 shown, when the hanging basket moves from the first beam segment to the second beam segment, the width of the beam body becomes wider. At this time, the connection between the middle and lower cross beams and the main longitudinal beam can be released. After the middle and lower cross beams move outward in place, pre-tighten the bolts, and then re-adjust the fulcrum position according to the calculation.

[0124] Through the construction method of the rear fulcrum hanging basket technology of the PC cable-stayed bridge π-shaped beam provided in this example, compared with the repeated adjustment of the stay cables 700 and the complex construction process of the front fulcrum, it has certain advantages. It not only improves the construction efficiency, but also provides a technical reference for the construction of the rear fulcrum hanging basket for the same type of bridges.

[0125] Through the above method, the position and magnitude of the reaction force of the hanging basket fulcrum can be adjusted to achieve active control of the force of the main beam, so as to avoid the safety risks during the construction of the extra-wide main beam of the PC cable-stayed bridge.

[0126] By alternately using the upper and lower walking hanging frames, the key problem of the spatial intersection between the walking process of the hanging basket and the stay cables is effectively solved, and a certain technical reference is provided for the walking scheme when the same type of bridges adopt the rear fulcrum hanging basket.

[0127] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ultra-wide variable width PC cable-stayed bridge π-shaped beam rear support hanging basket, characterized in that: It includes a main truss system and a bottom basket system, wherein the bottom basket system is arranged as a whole below the main truss system, and the main truss system is connected to the bottom basket system and the π-shaped beam through an anchoring suspension system; The main truss system includes A main truss, wherein the main truss is perpendicular to the π-shaped beam as a whole, and is arranged parallel to the length direction of the π-shaped beam, and the main truss is provided with two groups, and the two groups of main trusses are arranged oppositely on both sides above the π-shaped beam; as well as A middle and lower cross beam, which is arranged below the main truss and is removably connected to the main truss. The middle and lower cross beam is arranged parallel to the width direction of the π-shaped beam, and a movable pad is arranged below the middle and lower cross beam. The middle and lower cross beam can move linearly along the width direction of the π-shaped beam to adjust the width of a single group of main trusses; The rear fulcrum hanging basket also includes a walking system, which can drive the above-mentioned main truss to move along the length direction of the π-shaped beam, so that the bottom basket system can move linearly accordingly.

2. The rear support point hanging basket of the π-shaped beam of the ultra-wide variable-width PC cable-stayed bridge according to claim 1 is characterized in that: Each group of the main trusses includes two groups of triangular trusses arranged in parallel, and the two groups of triangular trusses are connected by a main truss connecting frame; The triangular truss comprises A main longitudinal beam, which is disposed horizontally as a whole and parallel to the length direction of the π-shaped beam, and is removably connected to the middle and lower cross beams; and A truss rod, wherein the truss rod is vertically arranged as a whole, the bottom end of the truss rod is fixedly connected to the middle part of the main longitudinal beam, and the top end of the truss rod is connected to the two ends of the main longitudinal beam through an inclined rod; The main truss also includes a main upper cross beam, which is fixed to the upper surface of one end of the main longitudinal beam. The main upper cross beam is connected to the bottom basket system through an anchoring suspension system.

3. The rear support point hanging basket of the π-shaped beam of the ultra-wide variable-width PC cable-stayed bridge according to claim 2 is characterized in that: The two groups of main trusses are connected by main truss transverse tie rods.

4. The rear support hanging basket of the π-shaped beam of an ultra-wide variable-width PC cable-stayed bridge according to claim 2 or 3, characterized in that: The main truss also includes two groups of traveling hangers arranged on the outside of the main truss. The traveling hangers are cantilevered and extend to the outside of the main truss. The traveling hangers are connected to the bottom basket system through the above-mentioned anchoring suspension system.

5. The rear support point hanging basket of the π-shaped beam of the ultra-wide variable-width PC cable-stayed bridge according to claim 4 is characterized in that: The bottom basket system includes A front crossbeam frame connected to the main upper crossbeam via an anchoring suspension system; and A rear cross beam frame is arranged parallel to the front cross beam frame, and is connected to the traveling hanger through an anchoring suspension system. The rear cross beam frame is connected to the front cross beam frame through a cross beam frame connection system.

6. The rear support hanging basket of the π-shaped beam of the ultra-wide variable-width PC cable-stayed bridge according to claim 5 is characterized in that: The front crossbeam frame includes A front upper chord rod, the front upper chord rod being provided in a single group; and The front lower chord bar is provided with two groups, which are arranged on both sides below the front upper chord bar in parallel with the front upper chord bar. The two groups of the front lower chord bars are connected with the above-mentioned front upper chord bar through the first web bar to form a front upper cross beam frame with a triangular structure.

7. The rear support hanging basket of the π-shaped beam of the ultra-wide variable-width PC cable-stayed bridge according to claim 6 is characterized in that: The front crossbeam frame also includes A truss horizontal bar, the truss horizontal bar is parallel to the front lower chord bar and is arranged below the front lower chord bar; A truss upright, wherein the truss upright is vertically disposed between the truss horizontal bar and the front lower chord bar, and the truss horizontal bar and the front lower chord bar are fixedly connected by the truss upright; and A truss diagonal rod, one end of which is fixedly connected to the truss horizontal rod, and the other end of which extends upward and obliquely toward the outside of the truss horizontal rod and is connected to the front lower chord rod; The truss horizontal rods, truss vertical rods, truss diagonal rods and the front lower chord rods form a trapezoidal truss.

8. The rear support point hanging basket of the π-shaped beam of the ultra-wide variable-width PC cable-stayed bridge according to claim 7 is characterized in that: The rear crossbeam frame includes A rear upper chord rod, wherein both ends of the rear upper chord rod are locally linearly lowered; as well as The rear lower chord is connected to the rear upper chord through a second web member to form a single truss structure.

9. The rear support point hanging basket of the π-shaped beam of the ultra-wide variable-width PC cable-stayed bridge according to claim 5 is characterized in that: The walking system includes A bracket, the bracket is anchored above the π-shaped beam, and the main longitudinal beam is partially embedded in the bracket; as well as A propulsion system is connected to the bracket and a reaction seat arranged at the end of the main longitudinal beam, and the main truss system is pushed to move through the propulsion system.

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