A construction device for improving the construction efficiency of a V-shaped bridge triangular region

Abstract

The utility model discloses a kind of construction device for improving the construction efficiency of V-bridge triangle area, comprising: pier seat, bottom connection cushion cap or pier column, form Y-type pier structure;Oblique leg, contain part pier top box girder consolidation section, adopt low-position cast-in-place or prefabricated assembly, and connect with pier seat by vertical hinge;Triangular area top box girder section, through support assembly construction, connect with oblique leg through embedded steel bar, support assembly includes first support and second support;Oblique leg post-cast segment, for closing vertical hinge area, make oblique leg and pier seat form integral force structure;Box girder closure section, connect through rigid frame, complete triangular area integration;Vertical rotation system, for vertical rotation construction of oblique leg;Limiting block, welded on steel bar, prevent vertical rotation overreach.The utility model uses low-lying cast-in-place method to construct oblique leg containing part pier top box girder consolidation section, then V-structure triangular area construction method of vertical rotation and triangular area top box girder section closure, reduce the risk of high-position operation and support overturning.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, specifically to a construction device for improving the construction efficiency of the triangular area of ​​a V-shaped bridge. Background Technology

[0002] V-shaped rigid frame bridges, with their core advantages of high load-bearing efficiency, lightweight design, and material savings, are irreplaceable in urban bridges, landscape projects, and medium-span transportation hubs. A V-shaped rigid frame bridge is a special form of continuous rigid frame bridge. Its core feature is the design of the piers as V-shaped inclined legs, with the piers and beams rigidly connected to form a triangular overall load-bearing system. The V-shaped triangular area consists of two inclined legs and a top box girder, forming an inverted triangular structure. This structure effectively increases structural stiffness, extends bridge span, reduces mid-span bending moment and support shear force, and saves materials and construction costs. The inclined legs can be constructed with or without supports and with an internal stiffening frame, but effective measures should be taken to prevent excessive local stress or deformation in the cross-section of the inclined legs. Currently, inclined leg construction mostly adopts the method of using concrete inclined legs with supports or steel structure inclined legs with tie rods. There are many disadvantages in construction, such as high difficulty in construction control, reliance on passive tie rods, easy to cause cracks due to calculation errors, high construction risk, high probability of instability of high-altitude supports, high requirements for formwork installation accuracy, easy to cause defects such as misalignment and bulging due to support deformation, poor environmental adaptability, limited by the bearing capacity of the support foundation, great difficulty in construction in mountainous areas and water areas, poor economic efficiency, inclined legs are poured in sections, and the construction period is long; temporary support structures such as angle steel tie rods and balance frames cannot be reused after dismantling, resulting in significant material waste, poor coordination, and the inclined legs and the top box girder cannot be constructed simultaneously.

[0003] Currently, the vertical rotation method has been practically applied in numerous projects. Its principle is to use a vertical rotation hinge as a fulcrum, combined with a traction system of steel strands, winches, and an anchoring system of anchor cables and anchorages, to lift components from their lower installation position to the designed height. This method offers good economic benefits, reducing the cost of high-altitude scaffolding, lowering material and equipment inputs, improving safety by converting high-altitude operations to ground-based operations, mitigating construction risks, and adaptability to complex terrain and existing transportation line protection.

[0004] Therefore, a construction method to improve the construction efficiency of the triangular area of ​​V-shaped bridges urgently needs to be studied. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a construction device for improving the construction efficiency of the triangular area of ​​a V-shaped bridge, comprising: The pier base is connected to the foundation or pier column at the bottom, forming a Y-shaped pier structure. The inclined leg, which includes part of the fixed section of the box girder at the top of the pier, is constructed by low-level cast-in-place or precast assembly and is connected to the pier base by a vertical hinge. The top box girder segment of the triangular area is constructed using a support assembly and connected to the inclined leg via pre-embedded steel bars. The support assembly includes a first support and a second support. The post-cast section of the inclined leg is used to close the vertical hinge area, so that the inclined leg and the pier base form an integral load-bearing structure; The box girder closure section is connected by a rigid frame to complete the integration of the triangular area; The vertical rotation system, including the vertical rotation hinge, lifting point, traction rope, tower crane frame and lifting trolley, is used for the vertical rotation construction of the inclined leg; The limit block is welded to the steel bar to prevent vertical rotation from going too far.

[0006] Furthermore, the inclined leg is a box-shaped hollow thin-walled pier or a solid pier, and the material is reinforced concrete, steel-concrete composite structure or steel-UHPC composite structure, and the cross-sectional shape is box-shaped, dumbbell-shaped, H-shaped, I-shaped or king-shaped.

[0007] Furthermore, multiple vertical hinges are arranged in the transverse direction. After the inclined leg is vertically rotated into place, it can be retained as a force transmission structure or removed and then sealed with concrete.

[0008] Furthermore, the lifting trolley is equipped with adjustable-angle wedge blocks or a wheel-rail system to assist in the vertical rotation of the inclined legs and ensure stability.

[0009] Furthermore, the tower crane is installed on the top of the top box girder section of the triangular area, and the traction equipment is a winch or a hydraulic jack.

[0010] The advantages of the utility model compared to the prior art are: Improve construction efficiency and shorten the construction period By adopting a low-lying cast-in-place method to construct the inclined leg, including the partially pier-top box girder consolidation section, and then vertically rotating it to join the top box girder section of the triangular area, the construction method of the V-shaped triangular area overcomes the difficulties of formwork erection and rebar binding during inclined leg construction, reduces the risk of high-level operations and scaffold overturning, reduces the input of turnover materials such as steel pipe scaffolds, and allows parallel operation of the inclined leg, partially pier-top box girder consolidation section, and the top box girder section of the triangular area, improving work efficiency, shortening the construction cycle of the V-shaped triangular area, and resulting in significant direct economic benefits.

[0011] 2. Reduce construction risks and improve safety. The inclined legs are cast or precast at a low position, reducing high-altitude work and lowering the risk of falls. The first and second supports bear the load only at a low position, avoiding the overturning risk of traditional high-position supports, making construction more stable. The lifting trolley can dynamically adjust the support angle to prevent instability during the vertical rotation of the inclined legs, improving construction safety. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of a construction device for improving the construction efficiency of the triangular area of ​​a V-shaped bridge according to the present invention. Figure 2 This is a schematic diagram of the structure in step 1; Figure 3 This is a schematic diagram of the structure in step 2; Figure 4 This is a schematic diagram of the structure in step 3; Figure 5 This is a schematic diagram of the structure in step 4; Figure 6 This is a structural diagram of step 5; Figure 7 This is a schematic diagram of the structure in step 6; Figure 8 This is a schematic diagram of the structure in step 7.

[0013] Among them, 1. Pier base, 2. Inclined leg, 3. Top box girder section of the triangular area, 4. Post-cast section of the inclined leg, 5. Closure section of the box girder, 6. Vertical pivot hinge, 7. Reinforcing steel, 8. First support, 9. Second support, 10. Lifting trolley, 11. Tower crane installation frame, 12. Traction rope, 13. Lifting point, 14. Limiting block. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings.

[0015] The present invention will be described in detail with reference to the accompanying drawings.

[0016] In specific implementation, this utility model provides a construction device for improving the construction efficiency of the triangular area of ​​a V-shaped bridge, comprising: Pier base 1, with its bottom connected to a foundation or pier column, forming a Y-shaped pier structure; The inclined leg 2 includes a portion of the pier top box girder fixed section, which is constructed by low-level cast-in-place or precast assembly, and is connected to the pier base 1 by the vertical pivot hinge 6. The top box girder segment 3 of the triangular area is constructed through a support assembly and connected to the inclined leg 2 through pre-embedded steel bars 7. The support assembly includes a first support 8 and a second support 9. The inclined leg post-cast section 4 is used to close the vertical hinge 6 area, so that the inclined leg 2 and the pier base 1 form an integral load-bearing structure; The fifth box girder closure segment is connected by a rigid frame to complete the integration of the triangular area; The vertical rotation system, including the vertical rotation hinge 6, lifting point 13, traction rope 12, tower crane 11 and lifting trolley 10, is used for the vertical rotation construction of the inclined leg 2; Limiting block 14 is welded to steel bar 7 to prevent vertical rotation from going too far. Example

[0017] Construction of the triangular area of ​​the V-shaped continuous beam bridge 1. Project Overview The main bridge of a certain cross-river bridge adopts an 85+160+85m V-shaped continuous beam bridge. The height of the inclined leg in the V-shaped triangular area is 38m, and the angle between the inclined leg and the pier is 55°. The inclined leg adopts a single-box single-cell steel-concrete composite structure, and the top box girder segment in the triangular area is a prestressed concrete structure.

[0018] 2. Construction Steps (1) Pier construction Tie the pier seat 1 steel bar on the pier cap, pre-embed the vertical hinge 6 lower hinge seat, pour C50 concrete, and cure to the design strength.

[0019] (2) Sloping leg low position cast-in-place A gravel foundation was filled next to the pier, a low support frame 8 was erected, steel bars for the inclined legs 2 were tied, and upper hinges, lifting points 13 and limiting blocks 14 were pre-embedded.

[0020] Steel formwork was used to cast the sloping leg box girder consolidation section, including the 2m top of the pier, and the concrete was cured to 90% of the design strength.

[0021] (3) Construction of the top box girder segment in the triangular area Simultaneously, 9 Type 83 military pier supports were erected on the pier top, 3 cast-in-place triangular top box girder sections were constructed, and 11 pre-embedded tower crane support anchor bolts were installed.

[0022] (4) Installation of vertical rotation system A tower crane 11 and two 200kN winches are installed on the top of the box girder, and Φ32mm traction steel strands 12 are threaded through to connect the inclined leg lifting points 13.

[0023] A wheel-rail type lifting trolley 10 is installed at the bottom of the inclined leg, equipped with a 500t hydraulic jack and adaptive wedge pads.

[0024] (5) Slanted leg vertical turn First, start the winch to apply 20% of the design tension, then remove the bottom support 8 of the inclined leg.

[0025] The lifting trolley 10 is lifted and pulled synchronously by the winch, controlling the vertical rotation speed to ≤1° / min, and monitoring the attitude of the inclined legs in real time.

[0026] When the vertical rotation reaches 53°, the limiting block 14 contacts. After fine-tuning to the designed 55°, a temporary support is welded.

[0027] (6) Construction of post-cast section The 4 steel bars of the inclined leg post-cast section were tied, and the 6 areas of the vertical hinge were sealed with ultra-high performance concrete.

[0028] Install the five-rigid frame of the box girder closure section, pour C60 micro-expansion concrete, and tension the prestressed steel strands.

[0029] (7) System transformation Dismantle temporary structures such as the lifting trolley and tower crane to complete the load transfer.

[0030] As a further explanation of this utility model, the inclined leg 2 is a box-shaped hollow thin-walled pier or a solid pier, and the material is reinforced concrete, steel-concrete composite structure or steel-UHPC composite structure, and the cross-sectional shape is box-shaped, dumbbell-shaped, H-shaped, I-shaped or king-shaped.

[0031] As a further explanation of this utility model, the vertical hinge 6 is arranged in multiple horizontal directions. After the inclined leg 2 is vertically rotated into place, it can be selected to be retained as a force transmission structure or removed and then sealed with concrete.

[0032] As a further explanation of this utility model, the lifting trolley 10 is equipped with an adjustable angle wedge block or wheel-rail system to assist the vertical rotation of the inclined leg 2 and ensure stability.

[0033] As a further explanation of this utility model, the tower crane 11 is installed on the top of the top box girder section 3 in the triangular area, and the traction equipment adopts a winch or a hydraulic jack.

[0034] A construction method for improving the construction efficiency of the triangular section of a V-shaped bridge is characterized by the following steps: Step 1, Pier 1 Construction: Install formwork, tie reinforcing bars, pre-embed vertical rotating shaft 6 lower rotating shaft components, pour concrete for pier 1, and remove formwork after the concrete has been fully vibrated and cured.

[0035] Step 2, Installation of brackets 8 and 9: After brackets 8 and 9 are installed as required, the preload weight of all brackets shall not be less than 1.2 times the sum of the structural load and the construction load, in order to eliminate plastic deformation.

[0036] Step 3, Construction of the inclined leg (including part of the pier top box girder fixed section) 2 and the triangular area top box girder section 3: Install formwork, tie reinforcement bars, pre-embed vertical rotating components 6, lifting points 13 and limiting blocks 14 in the inclined leg (including part of the pier top box girder fixed section) 2, and pre-embed connecting bolts for the tower crane (including traction equipment) 11 on the top of the triangular area top box girder section 3. A certain length of reinforcement bars 7 are reserved at the ends of both the inclined leg (including part of the pier top box girder fixed section) 2 and the triangular area top box girder section 3. Pour concrete for the inclined leg (including part of the pier top box girder fixed section) 2 and the triangular area top box girder section 3. After the concrete has been fully vibrated and cured, remove the formwork.

[0037] Step 4: Installation of the lifting trolley 10, tower crane frame (including traction equipment) 11, and traction rope 12: Install the tower crane frame (including traction equipment) 11 according to the pre-embedded connecting bolt positions. Then, install the traction rope 12 on both sides of the tower crane frame (including traction equipment) 11 and connect the traction rope 12 to the pre-embedded lifting points 13 on the two inclined legs (including part of the pier top box girder fixed section) 2. Start the traction equipment to apply traction force, then partially dismantle the support 8 and install the lifting trolley 10.

[0038] Step 5, vertical rotation construction: The lifting trolley 10 and the tower crane (including traction equipment) 11 are started simultaneously, the inclined leg (including part of the pier top box girder fixed section) 2 is rotated into place according to the design angle, and the limiting block 14 is removed.

[0039] Step 6, Construction of the inclined leg post-cast section 4 and the box girder closure section 5: Install the formwork, connect the reinforcing bars 7, the vertical rotation 6 can be left uncut, pour concrete for the inclined leg post-cast section 4 and the box girder closure section 5, and remove the formwork after the concrete has been fully vibrated and cured.

[0040] Step 7, dismantle auxiliary facilities: dismantle the lifting trolley 10, tower crane frame (including traction equipment) 11, traction rope 12, support 8 and support 9, and complete the V-shaped triangular area system conversion.

[0041] This embodiment can save construction time and reduce the amount of steel pipe supports used.

[0042] As a further explanation of this utility model, the inclined leg 2 is made by low-position cast-in-place or factory prefabrication, and after vertical rotation, it is fixed to the pier base 1 through the post-cast section 4.

[0043] As a further explanation of this utility model, the lifting trolley 10 dynamically adjusts the support angle during the vertical rotation of the inclined leg 2 to ensure construction safety.

[0044] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A construction device for improving the construction efficiency of the triangular section of a V-shaped bridge, characterized in that: include: Pier base (1), the bottom is connected to the pier cap or pier column to form a Y-shaped pier structure; The inclined leg (2) includes a section of the pier top box girder consolidation segment, which is cast in place or prefabricated at a low position and connected to the pier base (1) through a vertical hinge (6); The top box girder segment (3) of the triangular area is constructed through a support assembly and connected to the inclined leg (2) through pre-embedded steel bars (7). The support assembly includes a first support (8) and a second support (9). The inclined leg post-cast section (4) is used to close the vertical hinge (6) area, so that the inclined leg (2) and the pier base (1) form an integral load-bearing structure; The box girder closure section (5) is connected by a stiffening frame to complete the integration of the triangular area; The vertical rotation system, including a vertical rotation hinge (6), a lifting point (13), a traction rope (12), a tower crane (11), and a lifting trolley (10), is used for the vertical rotation construction of the inclined leg (2); The limiting block (14) is welded to the steel bar (7) to prevent vertical rotation from going too far.

2. The construction device for improving the construction efficiency of the triangular area of ​​a V-shaped bridge according to claim 1, characterized in that: The inclined leg (2) is a box-shaped hollow thin-walled pier or a solid pier. The material is reinforced concrete, steel-concrete composite structure or steel-UHPC composite structure. The cross-sectional shape is box-shaped, dumbbell-shaped, H-shaped, I-shaped or king-shaped.

3. The construction device for improving the construction efficiency of the triangular area of ​​a V-shaped bridge according to claim 1, characterized in that: The vertical hinge (6) is arranged in multiple horizontal directions. After the inclined leg (2) is vertically rotated into place, it can be retained as a force transmission structure or removed and then sealed with concrete.

4. The construction device for improving the construction efficiency of the triangular area of ​​a V-shaped bridge according to claim 1, characterized in that: The lifting trolley (10) is equipped with adjustable angle wedge blocks or wheel-rail systems to assist the inclined leg (2) in vertical rotation and ensure stability.

5. A construction device for improving the construction efficiency of the triangular area of ​​a V-shaped bridge according to claim 1, characterized in that: The tower crane (11) is installed on the top of the top box girder section (3) in the triangular area, and the traction equipment is a winch or a hydraulic jack.

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