Novel steel truss cable-stayed bridge cross beam cast-in-place support

Abstract

The utility model belongs to the technical field of cable-stayed bridge cross beam cast-in-place supports, and particularly relates to a novel steel truss type cable-stayed bridge cross beam cast-in-place support which comprises bracket cross rods arranged on the inner sides of two tower limbs of a tower column, and first shear keys fixed to the inner walls of the tower limbs of the tower column in a hinged mode. A bracket inclined rod is hinged to the middle position of the bottom of the bracket cross rod, and the lower end of the bracket inclined rod is hinged and fixed to a second shear key on the inner wall of the tower column and the tower limb; the unloading block is arranged at the top of the bracket cross rod; two bearing beams are symmetrically arranged; and the bailey beam frame is arranged at the tops of the two bearing beams. When the cast-in-place support of the cable-stayed bridge cross beam is erected, brackets are replaced by the shear keys, the shear keys are fixed on the tower limbs by means of the climbing cones, and the two finish rolling deformed steel bars penetrating through the tower limbs are used for reinforcement, so that the fixing firmness and the loading capacity of the shear keys are improved, the stability of the support is guaranteed, and the cast-in-place support is convenient to install and low in cost. And subsequent dismounting and recycling are facilitated, and operation is safe.

Description

Technical Field

[0001] The utility model belongs to the technical field of cast-in-situ supports for cross beams of cable-stayed bridges, and particularly relates to a novel steel truss type cast-in-situ support for cross beams of cable-stayed bridges. Background Technique

[0002] In the construction of traditional upper cross beams of cable towers, ground supports are widely used, and the foundation of the ground support is located on the lower cross beam of the main tower. When it is difficult to construct the upper cross beam with the ground support, a construction plan of a side bracket of the cable tower should be adopted, and the self-weight of the upper cross beam and other construction loads are transmitted to the main tower through the bracket rigid frame formed in the air.

[0003] During the construction of the cross beam of the inclined tower of a long-span cable-stayed bridge, due to the increase in the height of the tower column, steel pipe piles cannot be installed under the cross beam to support the cast-in-situ support. Therefore, it is usually adopted to embed corbels inside the tower column and erect a cross beam construction bracket on the corbels. For example, the cast-in-situ cross beam support frame disclosed in the patent of CN214613620U includes chord members, Bailey frames, distribution beams and bottom forms arranged inside the tower column. The chord members extend along the transverse direction of the bridge and are erected on the corbels preset on both sides of the tower column. An inclined strut is also connected to the bottom of the chord member. One end of the inclined strut is inclinedly connected to the chord member, and the other end thereof is supported on the corbels preset on the tower column. A tie rod connected to the corbels for erecting the chord member is arranged on the inclined strut. The Bailey frames are arranged above the chord members along the transverse direction of the bridge. A cross beam extending along the longitudinal direction of the bridge is arranged between the chord members and the Bailey frames. The distribution beams and the bottom forms are sequentially arranged above the Bailey frames. The cast-in-situ cross beam support frame disclosed in this patent forms a triangular bracket system through the inclined strut and the chord member, and at the same time, a tie rod is added to the inclined strut, so that the support frame has good structural stability, can meet the support requirements for the cast-in-situ middle cross beam, and has a simple structure, which is convenient for construction operation, shortens the construction time and improves the construction efficiency.

[0004] It is undeniable that the cast-in-situ cross beam support frame disclosed in this patent can indeed achieve the above technical effects, but it still has certain deficiencies: the corbels are connected by embedded steel bars embedded in the tower column, and the embedded steel bars and the end plates of the corbels are mostly welded, and there are great risks in high-altitude welding operations; secondly, the welding of the corbels is not convenient for installation and subsequent disassembly.

[0005] The information disclosed in this background technical part is only intended to increase the understanding of the overall background of the present utility model, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those of ordinary skill in the art. Content of the Utility Model

[0006] The purpose of the present utility model is to provide a novel steel truss type cast-in-situ support for cross beams of cable-stayed bridges to solve the problems existing in the cast-in-situ cross beam support frame in the background technique.

[0007] To achieve the above purpose, the present utility model provides the following technical solutions:

[0008] A cast-in-place support for the cross beam of a new type of steel truss cable-stayed bridge, comprising:

[0009] Bracket cross bars symmetrically arranged inside the two tower legs of the tower column and extending along the transverse bridge direction, with the inner ends of the bracket cross bars hinged and fixed to the first shear key on the inner wall of the tower leg of the tower column; a bracket diagonal bar is hinged at the middle position of the bottom of the bracket cross bar, and the lower end of the bracket diagonal bar is hinged and fixed to the second shear key on the inner wall of the tower leg of the tower column and located below the first shear key;

[0010] A drop block arranged at the middle position of the top of the bracket cross bar;

[0011] Two load-bearing beams symmetrically arranged and extending along the longitudinal bridge direction, with the load-bearing beams erected on the top of the drop block;

[0012] A Bailey beam truss arranged on the top of the two load-bearing beams and extending along the transverse bridge direction.

[0013] Preferably, bracket connection systems are welded respectively at the top and bottom of the bracket cross bar, and the bracket connection systems connect the bracket cross bars on the same tower leg of the tower column.

[0014] Preferably, the first shear key and the second shear key have the same structure; the first shear key includes an end plate, two support plates symmetrically and perpendicularly welded to the inner side of the end plate, a connecting plate welded to the tops of the two support plates and welded to the end plate, and a reinforcing plate welded to the outer sides of the two support plates and between the two support plates and close to the bottom of the support plates; wherein, two fine rolled threaded steel holes are symmetrically opened on both sides of the middle of the end plate, and a plurality of fixing holes are evenly opened on the end plate.

[0015] Preferably, climbing cones corresponding to the fixing holes are embedded on the tower leg of the tower column, and the first shear key and the second shear key are fixed on the tower leg of the tower column through climbing cone bolts corresponding to the climbing cones.

[0016] Preferably, fine rolled threaded steel is inserted into the fine rolled threaded steel holes of the end plates of the first shear key and the second shear key, and the fine rolled threaded steel penetrates through the tower leg of the tower column; both ends of the fine rolled threaded steel are locked with double nuts respectively.

[0017] Preferably, backing plates are installed inside the double nuts at both ends of the fine rolled threaded steel.

[0018] Preferably, a hinge ear is welded at the middle position of the bottom of the bracket cross bar; hinge holes are opened on the support plates of the first shear key and the second shear key.

[0019] Preferably, bent frames are arranged on both sides of the Bailey beam truss.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] When erecting the cast-in-place support for the cross beam of the cable-stayed bridge, the utility model replaces the corbel with a shear key. The shear key is fixed on the tower limb by means of a climbing cone and reinforced with 2 high-strength rolled steel bars passing through the tower limb, which improves the fixing firmness and load capacity of the shear key, ensures the stability of the support, and is convenient for installation and subsequent disassembly and recycling, and the operation is safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 is a schematic diagram of the connection of the bracket cross bar, bracket diagonal bar and shear key of the utility model;

[0024] Figure 3 is a schematic diagram of the structure of the first shear key and the second shear key of the utility model;

[0025] Figure 4 is Figure 3 the right view of.

[0026] MAIN REFERENCE NUMERAL DESCRIPTION:

[0027] 1, tower column; 11, tower limb; 12, climbing cone; 13, climbing cone bolt;

[0028] 2, bracket cross bar; 21, bracket connection system; 22, hinge ear;

[0029] 3, first shear key; 31, end plate; 311, high-strength rolled steel bar hole; 312, fixing hole; 32, support plate; 321, hinge hole; 33, connecting plate; 34, reinforcing plate;

[0030] 4, bracket diagonal bar;

[0031] 5, second shear key;

[0032] 6, high-strength rolled steel bar; 61, backing plate; 62, double nuts;

[0033] 7, drop block;

[0034] 8, load-bearing beam;

[0035] 9, Bailey beam frame; 91, bent frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following is a clear and complete description of the technical solution of the patent of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present utility model.

[0037] Embodiment

[0038] Refer to the attached Figures 1-4 , a cast-in-place support for the cross beam of a new type of steel truss cable-stayed bridge, including:

[0039] The bracket cross bars 2 symmetrically arranged on the inner sides of the two tower legs 11 of the tower column 1 and extending along the transverse bridge direction, and the first shear key 3 with the inner end of the bracket cross bar 2 hinged and fixed on the inner wall of the tower leg 11 of the tower column 1; a bracket diagonal bar 4 is hinged at the middle position of the bottom of the bracket cross bar 2, and the lower end of the bracket diagonal bar 4 is hinged and fixed on the inner wall of the tower leg 11 of the tower column 1 and located at the second shear key 5 below the first shear key 3; in this embodiment, the first shear key 3 and the second shear key 5 have the same structure; the first shear key 3 includes an end plate 31, 2 support plates 32 symmetrically and perpendicularly welded to the middle part of the inner side of the end plate 31, a connecting plate 33 welded to the tops of the 2 support plates 32 and welded to the end plate 31, and stiffening plates 34 welded to the outer sides of the 2 support plates 32 and between the 2 support plates 32 and near the bottom of the support plates 32; wherein, two precision rolled threaded steel holes 311 are symmetrically opened on both sides of the middle part of the end plate 31, and a plurality of fixing holes 312 are evenly opened on the end plate 31; climbing cones 12 corresponding to the fixing holes 312 are embedded on the tower leg 11 of the tower column 1, and the first shear key 3 and the second shear key 5 are fixed on the tower leg 11 of the tower column 1 through climbing cone bolts 13 corresponding to the climbing cones 12; precision rolled threaded steel 6 is inserted into the precision rolled threaded steel holes 311 of the end plates 31 of the first shear key 3 and the second shear key 5, and the precision rolled threaded steel 6 penetrates through the tower leg 11 of the tower column 1; backing plates 61 are respectively installed at both ends of the precision rolled threaded steel 6 and are locked with double nuts 62 at both ends; it is not difficult to understand here that when installing the first shear key 3 and the second shear key 5, the outer end backing plate 61 of the precision rolled threaded steel 6 abuts against the outer wall of the tower leg 11 of the tower column 1, and the inner end backing plate 61 abuts against the end plate 31;

[0040] The falling block 7 arranged at the middle position of the top of the bracket cross bar 2;

[0041] Two load-bearing beams 8 symmetrically arranged and extending along the longitudinal bridge direction, and the load-bearing beams 8 are erected on the top of the falling block 7;

[0042] The Bailey beam frame 9 arranged on the top of the two load-bearing beams 8 and extending along the transverse bridge direction, and row frames 91 are arranged on both sides of the Bailey beam frame 9. It should be noted here that the row frames 91 are self-made, and their shapes are as Figure 1 shown.

[0043] In this embodiment, in order to make the cast-in-place support more stable and firm, bracket connection systems 21 are welded to the top and bottom of the bracket cross bar 2 respectively. The bracket connection systems 21 connect the bracket cross bars 2 located on the same tower limb 11 of the tower column 1.

[0044] Secondly, in this embodiment, a hinge ear 22 is welded at the middle position of the bottom of the bracket cross bar 2; hinge holes 321 are formed in the support plates 32 of the first shear key 3 and the second shear key 5. The bracket diagonal bar 4 can be hinged to the bracket cross bar 2 by means of a pin shaft passing through the upper end of the bracket diagonal bar 4 and the corresponding hinge ear 22; the bracket diagonal bar 4 can be hinged to the second shear key 5 by means of a pin shaft passing through the lower end of the bracket diagonal bar 4 and the hinge hole 321 of the support plate 32 of the second shear key 5; the bracket cross bar 2 can be hinged to the first shear key 3 by means of a pin shaft passing through the inner end of the bracket cross bar 2 and the hinge hole 321 of the support plate 32 of the first shear key 3.

[0045] During use, the steel truss cable-stayed bridge cross beam cast-in-place support in this embodiment is erected according to the foregoing connection relationship, then the corresponding formwork is installed, the steel bars are erected and tied, and finally the concrete is poured in layers.

[0046] The foregoing description of the specific exemplary embodiments of the present invention is for the purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and obviously, many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A new type of cast-in-place support for steel truss cable-stayed bridge beams, characterized in that: include: A bracket cross bar is symmetrically arranged on the inner side of the two tower limbs of the tower column and extends along the transverse bridge direction, the inner end of the bracket cross bar is hingedly fixed to the first shear key on the inner wall of the tower limb of the tower column; a bracket diagonal bar is hingedly fixed at the middle position of the bottom of the bracket cross bar, and the lower end of the bracket diagonal bar is hingedly fixed to the inner wall of the tower limb of the tower column and the second shear key located below the first shear key; A drop block disposed at the middle of the top of the bracket crossbar; Two load-bearing beams are symmetrically arranged and extend along the bridge direction, and the load-bearing beams are erected on the top of the unloading block; A Bailey beam frame is arranged on the top of the two load-bearing beams and extends along the transverse direction of the bridge.

2. The new type of cast-in-place support for steel truss cable-stayed bridge beams according to claim 1 is characterized in that: The top and the bottom of the bracket crossbar are respectively welded with bracket connection systems, and the bracket connection systems are connected to the bracket crossbars located on the same tower limb of the tower column.

3. The new type of cast-in-place support for steel truss cable-stayed bridge beams according to claim 1 is characterized in that: The first shear key and the second shear key have the same structure; the first shear key includes an end plate, two support plates symmetrically and vertically welded to the inner side of the end plate, a connecting plate welded to the top of the two support plates and welded to the end plate, and a reinforcing plate welded to the outer side of the two support plates and between the two support plates and close to the bottom of the support plate; wherein, two precision-rolled threaded steel holes are symmetrically opened on both sides of the middle part of the end plate, and a plurality of fixing holes are also evenly opened on the end plate.

4. The new type of cast-in-place support for steel truss cable-stayed bridge beams according to claim 3 is characterized in that: A climbing cone corresponding to the fixing hole is pre-embedded on the tower column limb, and the first shear key and the second shear key are fixed to the tower column limb by climbing cone bolts corresponding to the climbing cone.

5. The new type of cast-in-place support for steel truss cable-stayed bridge cross beams according to claim 3 is characterized in that: Finished rolled threaded steel is inserted into the finished rolled threaded steel holes of the first shear key and the second shear key end plates, and the finished rolled threaded steel runs through the tower column and tower limb; both ends of the finished rolled threaded steel are respectively locked with double nuts.

6. The new type of cast-in-place support for steel truss cable-stayed bridge beams according to claim 3 is characterized in that: Pads are installed inside the double nuts at both ends of the precision-rolled threaded steel.

7. The new type of cast-in-place support for steel truss cable-stayed bridge cross beams according to claim 3 is characterized in that: A hinge ear is welded at the middle position of the bottom of the bracket crossbar; and hinge holes are opened on the support plates of the first shear key and the second shear key.

8. The novel cast-in-place support for cross beams of steel truss cable-stayed bridge according to claim 1 is characterized in that: Frames are arranged on both sides of the Bailey beam frame.

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