Bridge pier anti-collision and anti-scouring facilities and construction methods based on temporary bridge construction

Abstract

The present invention relates to a pier anti-collision and anti-scour facility and a construction method based on a temporary bridge construction. The facility comprises a sacrificial pile located upstream of a bridge pier in the direction of water flow, a concrete platform fixed to the top of the sacrificial pile below the normal water level, and a prefabricated tie beam fixed between the concrete platform and the pier. The sacrificial pile comprises an outer pipe pile formed by a temporary bridge pile foundation and a micro steel pipe pile located within the outer pipe pile. Concrete is poured into the outer pipe pile and the micro steel pipe pile and the lower end is buried in the riverbed. The prefabricated tie beam comprises a central steel plate with two ends respectively connected to the concrete platform and the pier, an outer square steel casing sleeved on the outside of the central steel plate, and a hard material located between the outer square steel casing and the central steel plate. The bridge anti-collision and anti-scour structural facility fully utilizes the temporary bridge construction. According to the principle of combining permanent and temporary construction, the temporary bridge pile foundation is arranged to facilitate the use of the bridge anti-collision and anti-scour structural facility, thereby saving project cost.

Description

Technical Field

[0001] The invention relates to a bridge pier anti-collision and anti-scouring facility based on temporary bridge construction and a construction method. Background Art

[0002] Scour has become one of the important factors causing bridge damage. Therefore, how to ensure the safe and stable operation of bridges under water scour has become an urgent problem that needs to be solved.

[0003] Currently, scour protection measures for bridge piers can be divided into two categories: active and passive. Active protection reduces the scouring effect of water flow by changing the water flow structure in front of the pier (pile); passive protection reduces the scouring effect of water flow by improving the scour resistance of the soil around the pier (pile). Sacrificial piles in front of the pier are one type of active protection measure. This measure involves installing several short piles (i.e., sacrificial piles) in front of the pier (pile) to divert the water flow. Although this measure can provide a certain degree of scour prevention, it has significant limitations:

[0004] (1) Sacrificial piles are cantilever components. When encountering large flow and high velocity water, the sacrificial piles are easily washed away, losing their protective effect and resulting in high maintenance costs. To ensure the protective effect of the sacrificial piles, they are buried deep in the soil layer, resulting in high costs.

[0005] (2) Bridge piers on navigable rivers generally require anti-collision facilities to prevent ship collisions. In this case, sacrificial piles need to be placed outside the anti-collision facilities in front of the piers, which are farther away from the piers, weakening the protective effect.

[0006] (3) The installation position of the sacrificial piles coincides with the height of the temporary bridge. Construction can only be carried out after the main bridge construction is completed and the temporary bridge is dismantled. The construction period is long and the cost is high.

[0007] Therefore, it is necessary to improve the sacrificial piles in front of the pier and design a facility and construction method with good protection effect, low cost, and anti-collision and anti-scour functions. Summary of the Invention

[0008] In order to improve the existing problems of high cost and weak protection effect of sacrificial piles, the design of the present invention is as follows:

[0009] The anti-collision and anti-scour facilities for the piers of the temporary bridge under construction include sacrificial piles located upstream of the bridge piers in the direction of water flow, a concrete platform fixed on the top of the sacrificial piles below the normal water level, and a prefabricated tie beam fixed between the concrete platform and the piers. The sacrificial piles include outer pipe piles composed of temporary bridge pile foundations and micro steel pipe piles located inside the outer pipe piles. Concrete is poured into the outer pipe piles and the lower ends of the steel pipe piles are buried in the riverbed. The prefabricated tie beam includes a central steel plate with two ends respectively connected to the concrete platform and the pier, an outer square steel casing sleeved on the outside of the central steel plate, and a hard material located between the outer square steel casing and the central steel plate.

[0010] Preferably, the concrete platform is triangular in shape, and one end of the concrete platform away from the bridge pier has an arc-shaped chamfer, a buffer is fixed on the periphery of the concrete platform, and the top surface of the concrete platform is higher than the lowest water level.

[0011] Preferably, the upper ends of the outer pipe piles and the micro steel pipe piles are embedded in the concrete platform by 150 mm to 250 mm.

[0012] Preferably, the outer pipe piles are enclosed to form a triangle shape, and the micro steel pipe piles are arranged in a plum blossom shape.

[0013] Preferably, the buffer member is a tire or a buoyancy tank.

[0014] Preferably, the hard material is cement mortar or plain concrete, and the central steel plate is 50 mm to 150 mm longer than both ends of the outer square steel tube.

[0015] Preferably, the central steel plate is made of low yield point mild steel.

[0016] A construction method for the bridge pier anti-collision and anti-scour facilities based on the temporary bridge construction as described above:

[0017] (1) Temporary bridge steel pipe piles are constructed at the upstream of the bridge as temporary bridge pile foundations. The temporary bridge steel pipe piles in front of the bridge pier in the direction of water flow are arranged in a triangular shape to form outer pipe piles. The temporary bridge steel pipe piles at other locations are arranged in parallel at two points in the direction of water flow. The lower end of the outer pipe pile should be buried in the riverbed and meet the designed flood scouring and collapse resistance requirements;

[0018] (2) Construct a temporary bridge above the temporary bridge steel pipe piles for temporary use during the construction of the main structure of the bridge;

[0019] (3) Construct the main structure of the bridge. After the main structure is completed, remove the temporary bridge superstructure and the temporary bridge steel pipe piles except for the outer pipe piles in front of the piers;

[0020] (4) Cut the remaining steel pipe piles for the temporary bridge as outer pipe piles so that the upper ends of the outer pipe piles are below the normal water level;

[0021] (5) Construct micro steel pipe piles in the area inside the outer pipe piles, and pour concrete into the outer pipe piles and micro steel pipe piles as sacrificial piles;

[0022] (6) Construct a pier retaining ring on the pier. The pier retaining ring is cast with reinforced concrete. A concrete platform is constructed above the sacrificial pile, and buffer parts are installed around the side of the concrete platform.

[0023] (7) Prefabricated tie beams, which include a central steel plate connected to the concrete platform and the pier at both ends, an outer steel casing sleeved outside the central steel plate, and hard materials between the outer steel casing and the central steel plate;

[0024] (8) Install the tie beam, and connect the central steel plate of the tie beam to the concrete platform and the pier retaining ring respectively.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The anti-collision and anti-scouring structure facilities of the bridge make full use of the temporary bridge for construction. According to the principle of combining permanent and temporary facilities, the pile foundation of the temporary bridge for construction is arranged to facilitate the use of the anti-collision and anti-scouring structure facilities of the bridge, thus saving the construction cost.

[0027] (2) A concrete platform is set on the top of the sacrificial piles to connect the sacrificial piles into a whole, thereby improving the overall anti-scour ability of the sacrificial piles. At the same time, the concrete platform can also be used as an anti-collision facility for the bridge.

[0028] (3) The center steel plate of the tie beam is made into a flexible component, which can improve the energy dissipation capacity of the tie beam and reduce the transmission of the impact force from the bridge impacting the concrete platform to the bridge pier. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 For the present invention Figure 1 Top view of the bridge's anti-collision and anti-scour structural facilities;

[0030] Figure 2 Cross-sectional view of bridge anti-collision and anti-impact structural facilities

[0031] Figure 3 This is the structural diagram of the tie beam;

[0032] In the figure: 100-bridge pier, 101-temporary bridge steel pipe pile, 102-pier retaining ring, 103-temporary bridge, 105-demolition area, 10-sacrificial pile, 110-external pipe pile, 120-micro steel pipe pile, 20-concrete platform, 210-buffer, 30-tie beam, 310-external square steel casing, 320-center steel plate, 330-hard material, 40-bridge. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] See also Figure 1-2 The present invention designs a bridge pier anti-collision and anti-scour facility based on the construction of a temporary bridge, including a sacrificial pile 10 located upstream of the bridge pier 100 of the cross-river bridge 40 in the direction of water flow and a concrete platform 20 fixed to the top of the sacrificial pile below the normal water level. The sacrificial pile 10 includes an outer pipe pile 110 composed of a temporary bridge pile foundation and a micro steel pipe pile 120 located inside the outer pipe pile. Concrete is poured into the outer pipe pile 110 and the micro steel pipe pile 120 and the lower end of the outer pipe pile 110 and the micro steel pipe pile 120 is buried in the riverbed.

[0035] In this embodiment, Figure 3 As shown, the sacrificial pile 10 is connected to the pier 100 via a prefabricated tie beam 30. The prefabricated tie beam 30 includes a central steel plate 320 whose ends are connected to the concrete platform and the pier respectively, an outer steel casing 310 sleeved outside the central steel plate, and a hard material 330 located between the outer steel casing and the central steel plate.

[0036] In this embodiment, the construction steps of the bridge pier anti-collision and anti-scour facilities based on the construction of temporary bridges are as follows:

[0037] (1) Temporary bridge steel pipe piles 101 are constructed at the upstream position of the bridge as temporary bridge pile foundations. The temporary bridge steel pipe piles in front of the bridge pier in the direction of water flow are arranged in a triangular shape to form outer pipe piles. The temporary bridge steel pipe piles at other locations are arranged in parallel at two points in the direction of water flow. The lower ends of the temporary bridge steel pipe piles should be buried in the riverbed and meet the designed flood scouring and collapse resistance requirements;

[0038] The temporary bridge steel pipe piles 101 are arranged in a triangular shape so that they can directly form outer pipe piles 110 after subsequent cutting, and are conducive to the subsequent construction of the concrete platform 20. The temporary bridge steel pipe piles 101 are in the form of steel pipe piles to meet the strength requirements. The temporary bridge steel pipe piles should be buried in the riverbed and meet the designed flood scouring and collapse resistance requirements.

[0039] In this embodiment, the temporary bridge steel pipe piles 101 except for the outer pipe piles 110 can be arranged at two points along the direction of water flow to support the temporary bridge.

[0040] (2) constructing a temporary bridge 103 above the temporary bridge steel pipe piles as a temporary bridge during the construction of the main structure of the bridge;

[0041] (3) After the main structure of the bridge is constructed, the upper structure of the temporary bridge 103 and the temporary bridge steel pipe piles except for the outer pipe piles in front of the piers will be dismantled. Figure 1 The dotted line portion is the demolition area 105, which means that the temporary bridge steel pipe piles 101 arranged in a triangular shape are retained;

[0042] (4) Cutting the temporary bridge steel pipe pile 101 retained as the outer pipe pile in step (3) so that the upper end of the outer pipe pile 110 is below the normal water level;

[0043] (5) constructing micro steel pipe piles 120 in the area inside the outer pipe piles, and pouring concrete into the outer pipe piles and the micro steel pipe piles to form sacrificial piles 10;

[0044] The outer pipe piles are enclosed to form a triangle shape, and the micro steel pipe piles are arranged in a plum blossom shape.

[0045] (6) Construct a pier retaining ring 102 on the pier. The pier retaining ring 102 is cast with reinforced concrete. A concrete platform 20 is constructed above the sacrificial pile 10, and buffer members 210 are provided around the concrete platform.

[0046] The outer pipe piles are 2m to 3m lower than the normal water level, and the upper ends of the outer pipe piles and the micro steel pipe piles are embedded in the concrete platform by 150mm to 250mm.

[0047] In order to better achieve bridge anti-collision and anti-scouring, the concrete platform 20 is triangular (with the concrete platform below), and the end of the concrete platform 20 away from the bridge pier has an arc chamfer, and the buffer member 210 is a flexible object such as a tire or a pontoon.

[0048] The concrete platform 20 connects the sacrificial piles into a single unit, enhancing their overall scour resistance. It also serves as a collision-avoidance feature for the bridge. Furthermore, the platform is designed with buffers to effectively mitigate direct impacts from objects carried by the river water.

[0049] The tie beam 30 is prefabricated, and the central steel plate of the tie beam 30 is connected to the concrete platform 20 and the pier retaining ring 102 respectively. The outer square steel casing of the tie beam 30 is filled with hard material 330.

[0050] Install tie beams, and the center steel plates of the tie beams are connected to the concrete platform and pier retaining rings respectively.

[0051] In this embodiment, the hard material is cement mortar or plain concrete, and the central steel plate is 50 mm to 150 mm longer than the ends of the outer square steel tube, so as to facilitate connecting the central steel plate 320 of the tie beam 30 to the concrete platform and the pier retaining ring 102 respectively.

[0052] By utilizing the central steel plate 320 as a flexible component, the sacrificial pile 10 can effectively absorb the impact energy when it encounters a collision, thereby improving the energy dissipation capacity of the tie beam and reducing the transmission of the impact force from the bridge impacting the concrete platform to the pier.

[0053] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A construction method for bridge pier anti-collision and anti-scour facilities based on temporary bridge construction, characterized in that: The anti-collision and anti-scour facilities for the piers of the temporary bridge construction include sacrificial piles located upstream of the bridge piers in the direction of water flow, a concrete platform fixed to the top of the sacrificial piles below the normal water level, and a prefabricated tie beam fixed between the concrete platform and the piers. The sacrificial piles include outer pipe piles formed by the temporary bridge pile foundation and micro steel pipe piles located within the outer pipe piles. The outer pipe piles and micro steel pipe piles are poured with concrete and their lower ends are buried in the riverbed. The prefabricated tie beam includes a central steel plate with two ends connected to the concrete platform and the pier respectively, an outer steel casing sleeved outside the central steel plate, and a hard material located between the outer steel casing and the central steel plate. (1) Temporary bridge steel pipe piles are constructed at the upstream of the bridge as temporary bridge pile foundations. The temporary bridge steel pipe piles in front of the bridge pier in the direction of water flow are arranged in a triangular shape to form outer pipe piles. The temporary bridge steel pipe piles at other locations are arranged in parallel at two points in the direction of water flow. The lower end of the outer pipe pile should be buried in the riverbed and meet the designed flood scouring and collapse resistance requirements; (2) Construct a temporary bridge above the temporary bridge steel pipe piles for temporary use during the construction of the main structure of the bridge; (3) Construct the main structure of the bridge. After the main structure is completed, remove the temporary bridge superstructure and the temporary bridge steel pipe piles except for the outer pipe piles in front of the piers; (4) Cut the remaining steel pipe piles for the temporary bridge as outer pipe piles so that the upper ends of the outer pipe piles are below the normal water level; (5) Construct micro steel pipe piles in the area inside the outer pipe piles, and pour concrete into the outer pipe piles and micro steel pipe piles as sacrificial piles; (6) Construct a pier retaining ring on the pier. The pier retaining ring is cast with reinforced concrete. A concrete platform is constructed above the sacrificial pile, and buffer parts are installed around the side of the concrete platform. (7) Prefabricated tie beams, which include a central steel plate connected to the concrete platform and the pier at both ends, an outer steel casing sleeved outside the central steel plate, and hard materials between the outer steel casing and the central steel plate; (8) Install tie beams, and connect the center steel plates of the tie beams to the concrete platform and pier retaining rings respectively; The buffer member is a tire or a buoyancy box.

2. The construction method of a bridge pier anti-collision and anti-scour facility based on a temporary bridge construction according to claim 1 is characterized in that: The concrete platform is triangular in shape, and one end of the concrete platform away from the bridge pier has an arc-shaped chamfer. A buffer is fixed on the periphery of the concrete platform, and the top surface of the concrete platform is higher than the lowest water level.

3. The construction method of a bridge pier anti-collision and anti-scour facility based on a temporary bridge construction according to claim 1 is characterized in that: The upper ends of the outer pipe piles and the micro steel pipe piles are embedded in the concrete platform by 150 mm to 250 mm.

4. The construction method of a bridge pier anti-collision and anti-scour facility based on a temporary bridge construction according to claim 2 is characterized in that: The outer pipe piles are enclosed to form a triangle shape, and the micro steel pipe piles are arranged in a plum blossom shape.

5. The construction method of a bridge pier anti-collision and anti-scour facility based on a temporary bridge construction according to claim 1 is characterized in that: The hard material is cement mortar or plain concrete, and the central steel plate is 50mm to 150mm longer than the two ends of the outer square steel pipe.

6. The construction method of a bridge pier anti-collision and anti-scour facility based on a temporary bridge construction according to claim 1 is characterized in that: The center steel plate is low yield point mild steel.

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