A bridge pier construction structure adjacent to an urban tunnel

Abstract

This utility model relates to a construction structure for bridge piers adjacent to urban tunnels, addressing the protection of tunnel structures during bridge pier construction near tunnels. In this structure, the tunnel splits into a left tunnel and a right tunnel at the corresponding location of the elevated approach bridge. Bridge piers for the elevated approach bridge are constructed between the left and right tunnels. A first row of interlocking piles is driven into the left side of the left tunnel, and a second row of interlocking piles is driven into the right side. A third row of interlocking piles is driven into the left side of the right tunnel, and a fourth row of interlocking piles is driven into the right side. A concrete compression beam is installed between the tops of the aligned first and second interlocking piles, and between the tops of the aligned third and fourth interlocking piles. A steel tensile beam is installed between the tops of some of the second and third interlocking piles. This construction protection structure reduces the impact of soil disturbance on the tunnel structure, ensuring structural safety.

Description

Technical Field

[0001] This utility model belongs to the field of bridge construction and relates to a bridge pier construction structure adjacent to an urban tunnel. Background Technology

[0002] In today's era of rapid urbanization, the urban population is growing dramatically, leading to an explosive increase in transportation demand. To alleviate surface traffic pressure and improve the convenience and efficiency of urban transportation, the development and utilization of urban air and underground spaces are accelerating at an unprecedented pace. Bridges and tunnels, as key nodes in transportation networks, occupy an important position in urban infrastructure construction, and construction projects involving both are increasingly common on the urban construction map.

[0003] Bridge piers, as key supporting components of bridge structures, bear the enormous loads from the bridge superstructure and transfer them to the foundation. During the construction of tunnels under construction, regardless of whether shield tunneling, mining methods, or other construction methods are used, the surrounding soil is disturbed. The spatial relationship between bridge piers and tunnels under construction is extremely complex, potentially exhibiting various layouts such as vertical overlap or close proximity.

[0004] This complex spatial relationship leads to significant mutual influence between the two during construction. During bridge construction, the construction of bridge piers pushes the soil laterally, compressing the tunnel structure. During tunnel construction, excavation alters the original stress balance, causing displacement and deformation of the surrounding soil. These deformations, transmitted to the bridge piers, can lead to tilting, bending, and other structural deformations, ultimately affecting the overall stability of the bridge. Therefore, minimizing disturbance to the surrounding soil and protecting existing bridges and tunnels during bridge or tunnel construction is crucial for construction safety.

[0005] In contrast, current technologies lack systematic design standards and mature construction techniques for complex situations such as bridge piers being built adjacent to tunnels under construction. Currently, designers often rely on traditional design concepts and limited engineering experience when faced with such projects, making it difficult to fully consider the complex interactions between the two. Construction units also lack clear technical guidance during actual construction, which undoubtedly increases the risks and uncertainties of the project significantly. Utility Model Content

[0006] The purpose of this utility model is to solve the problem of protecting the tunnel structure during the construction of bridge piers near tunnels, and to provide a bridge pier construction structure that is close to urban tunnels. By protecting the side of the tunnel and adjusting the angle of the bridge piers, the impact of bridge pier construction on the existing tunnel can be minimized.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: a bridge pier construction structure adjacent to an urban tunnel, including ground, a tunnel below the ground, and an elevated approach bridge above the ground. The tunnel and the elevated approach bridge are staggered in direction. The tunnel and the elevated approach bridge are branched into a left tunnel and a right tunnel at corresponding points. Bridge piers for the elevated approach bridge are constructed between the left tunnel and the right tunnel. A row of first interlocking piles is driven into the left side of the left tunnel, and a row of second interlocking piles is driven into the right side of the left tunnel. A row of third interlocking piles is driven into the left side of the right tunnel, and a row of fourth interlocking piles is driven into the right side of the right tunnel. A concrete compression beam is set between the tops of the left and right aligned first and second interlocking piles, and a concrete compression beam is set between the tops of the left and right aligned third and fourth interlocking piles. A steel tensile beam is set between the tops of some of the second and third interlocking piles. The steel tensile beam avoids the bridge pier construction position and is set in multiple rows on both the front and rear sides of the bridge pier construction position.

[0008] In this structure, at the intersection of the elevated approach bridge and the tunnel, the tunnel is bifurcated to the left and right, leaving space in the middle for the construction of the bridge piers of the elevated approach bridge. In the construction structure, interlocking piles are used to protect the left and right sides of the tunnel in the construction section, and concrete compression beams are used to connect the interlocking piles on both sides of the same tunnel for compression resistance. Steel tensile beams are used to connect the interlocking piles between the left and right tunnels for tensile resistance. During the construction of the pile foundation of the bridge piers, there will be compressive pressure that causes soil to be discharged outward. The construction protection structure of interlocking piles, concrete compression beams, and steel tensile beams can reduce the impact of soil disturbance on the tunnel structure and ensure structural safety.

[0009] Preferably, a longitudinal beam is provided between the tops of adjacent first interlocking piles, adjacent second interlocking piles, adjacent third interlocking piles, and adjacent fourth interlocking piles. The adjacent interlocking piles are connected in series by longitudinal beams, forming a grid structure with high-strength protective features in conjunction with concrete compression beams.

[0010] Preferably, the steel structure tie beam is a steel truss beam, an I-beam, or a channel steel beam.

[0011] Preferably, the first, second, third, and fourth interlocking piles have the same depth, and the bottom of the first interlocking pile is more than 10 meters below the bottom of the tunnel.

[0012] Preferably, the first, second, third, and fourth interlocking posts have the same diameter, which is not less than 0.8m.

[0013] Preferably, the concrete compression beam is not less than 600mm × 600mm.

[0014] Preferably, the top surfaces of the concrete compression beam and the steel tension beam are flush with the ground level.

[0015] Preferably, the bridge pier has a square foundation at its base, beneath which four piles are evenly distributed. The square sides formed by the four piles are parallel to the left and right tunnels. The bridge pier is supported by four piles, resulting in structural stability and preventing lateral tilting. Compared to single or double pile structures, the depth requirement for four piles is smaller, further reducing the impact on the tunnel structure. The parallelism of the square sides of the four piles to the left and right tunnels fully utilizes the space between them, maximizing the distance between the piles and the tunnel walls.

[0016] Preferably, the bridge pier is topped with a cap, the direction of which is perpendicular to the extension direction of the elevated approach bridge. The cap is twisted at a certain angle relative to the square abutment according to the orientation of the elevated approach bridge, ensuring the cap on top of the bridge pier matches the elevated approach bridge, and maintaining maximum spacing between the pile foundation structure of the bridge pier and the tunnel structure.

[0017] This utility model utilizes a construction protection structure that combines interlocking piles with concrete compression beams and steel tension beams to reduce the impact of soil disturbance on the tunnel structure and ensure structural safety. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a construction plan of this utility model.

[0020] Figure 2 This is a schematic diagram of a construction protection structure for tunnels and bridge piers according to this utility model.

[0021] Figure 3 This is a structural diagram of a common bridge pier column according to the present invention.

[0022] Figure 4 This is the utility model Figure 2 A schematic diagram of the torsional structure of a bridge pier.

[0023] Figure 5 This is a schematic diagram of the interlocking pile distribution structure of this utility model.

[0024] In the diagram: 1. Left tunnel, 2. Right tunnel, 3. Elevated approach bridge, 4. Bridge pier, 5. First interlocking pile, 6. Second interlocking pile, 7. Third interlocking pile, 8. Fourth interlocking pile, 9. Concrete compression beam, 10. Steel tensile beam, 41. Column, 42. Square pier cap, 43. Pile foundation, 44. Pier cap. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0026] Example: A bridge pier construction structure adjacent to an urban tunnel, such as... Figure 1 As shown. The site includes the ground level, a tunnel beneath the ground, and an elevated approach bridge 3 above the ground. The tunnel and the elevated approach bridge are staggered. At the corresponding points of the tunnel and the elevated approach bridge, traffic branches into a left tunnel 1 and a right tunnel 2. Bridge piers 4 of the elevated approach bridge 3 are constructed between the left tunnel 1 and the right tunnel 2.

[0027] like Figure 2 , 5 As shown, a row of first interlocking piles 5 is driven into the left side of the left tunnel 1, and a row of second interlocking piles 6 is driven into the right side of the left tunnel 1; a row of third interlocking piles 7 is driven into the left side of the right tunnel 2, and a row of fourth interlocking piles 8 is driven into the right side of the right tunnel 2. The diameters of the first, second, third, and fourth interlocking piles are the same, 1m in this example. The depths of the first, second, third, and fourth interlocking piles are the same, with the bottom of the first interlocking pile more than 10 meters below the tunnel floor. A longitudinal beam is provided between the tops of adjacent first, second, third, and fourth interlocking piles. A concrete compression beam 9 is installed between the tops of the first and second interlocking piles 5 and 6, which are aligned horizontally. A similar concrete compression beam 9 is installed between the tops of the third and fourth interlocking piles 7 and 8, which are also aligned horizontally. In this example, the concrete compression beam is no smaller than 800mm × 800mm. A steel tension beam 10 is installed between the tops of some of the second and third interlocking piles 6 and 7. This steel tension beam 10 avoids the construction location of the bridge pier 4 and has multiple sections on both the front and rear sides of the bridge pier 4 construction location. The steel tension beam 10 is made of steel truss beams, I-beams, or channel steel beams; in this example, I-beams are used. The top surfaces of the concrete compression beams and the steel tension beams are flush with the ground level.

[0028] like Figure 3 As shown, the bridge pier 4 includes a column 41, the bottom of which is a square foundation 42. Four pile foundations 43 are evenly arranged below the four corners of the square foundation. The top of the bridge pier 4 is provided with a pier cap 44, the direction of which is perpendicular to the extension direction of the elevated approach bridge 3.

[0029] like Figure 4 As shown, for the bridge pier 4 located between the left tunnel 1 and the right tunnel 2, the square side formed by the four pile foundations 43 is parallel to the left tunnel 1 and the right tunnel 2. Since the elevated approach bridge and the tunnel direction intersect at an angle, in this example, the pier cap 44 at the top of the bridge pier 4 has a 130-degree twist relative to the square pier cap 42.

[0030] In this construction structure, at the intersection of the elevated approach bridge and the tunnel, the tunnel is bifurcated to the left and right, leaving space in the middle for the construction of the bridge piers of the elevated approach bridge. The construction structure utilizes interlocking piles to protect the left and right sides of the tunnel during construction, and concrete compression beams to connect the interlocking piles on both sides of the same tunnel under compressive stress. Steel tension beams are used to connect the interlocking piles between the left and right tunnels under tensile stress. During the pile foundation construction of the bridge piers, there will be compressive forces causing soil to flow outwards. The interlocking piles, combined with the concrete compression beams and steel tension beams, can reduce the impact of soil disturbance on the tunnel structure and ensure structural safety.

Claims

1. A bridge pier construction structure adjacent to an urban tunnel, comprising a ground surface, a tunnel beneath the ground surface, and an elevated approach bridge above the ground surface, characterized in that: The tunnel and the elevated approach bridge are staggered, with the tunnel branching into a left tunnel and a right tunnel at the corresponding points. Bridge piers for the elevated approach bridge are constructed between the left and right tunnels. A first row of interlocking piles is driven into the left side of the left tunnel, and a second row of interlocking piles is driven into the right side of the left tunnel. A third row of interlocking piles is driven into the left side of the right tunnel, and a fourth row of interlocking piles is driven into the right side of the right tunnel. A concrete compression beam is installed between the tops of the first and second interlocking piles, and a concrete compression beam is installed between the tops of the third and fourth interlocking piles, which are also aligned. A steel tensile beam is installed between the tops of some of the second and third interlocking piles. The steel tensile beam avoids the construction location of the bridge piers and has multiple beams on both the front and rear sides of the bridge pier construction location.

2. The bridge pier construction structure adjacent to an urban tunnel according to claim 1, characterized in that: A longitudinal beam is provided between the tops of adjacent first interlocking piles, between the tops of adjacent second interlocking piles, between the tops of adjacent third interlocking piles, and between the tops of adjacent fourth interlocking piles.

3. The bridge pier construction structure adjacent to an urban tunnel according to claim 1, characterized in that: The steel structure tie beams are steel truss beams, I-beams, or channel steel beams.

4. The bridge pier construction structure adjacent to an urban tunnel according to claim 1, characterized in that: The first, second, third, and fourth interlocking piles have the same depth, and the bottom of the first interlocking pile is more than 10 meters below the bottom of the tunnel.

5. The bridge pier construction structure adjacent to an urban tunnel according to claim 1, characterized in that: The first, second, third, and fourth interlocking posts have the same diameter, which is not less than 0.8m.

6. The bridge pier construction structure adjacent to an urban tunnel according to claim 1, characterized in that: The concrete compression beam shall be no less than 600mm × 600mm.

7. A bridge pier construction structure adjacent to an urban tunnel according to claim 1, characterized in that: The top surfaces of the concrete compression beams and steel tension beams are level with the ground elevation.

8. The bridge pier construction structure adjacent to an urban tunnel according to claim 1, characterized in that: The bottom of the bridge pier is a square foundation, and four piles are evenly arranged below the square foundation. The square side of the four piles is parallel to the left and right tunnels.

9. A bridge pier construction structure adjacent to an urban tunnel according to claim 8, characterized in that: The bridge pier is topped with a pier cap, the direction of which is perpendicular to the extension direction of the viaduct approach.

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