Construction method of steel connecting bridge crossing road above subway

Abstract

The invention relates to a construction method of a steel connecting bridge crossing a road above a metro, which comprises the following steps: S1, pile foundations are constructed on two sides of the road and at positions away from the metro, and the construction steps of the pile foundation on each side comprise: drilling a pouring hole, providing a pile casing, lowering the pile casing into the pouring hole, binding reinforcing steel bars in the pile casing and pouring concrete to form a cast-in-situ bored pile; a pile cap is fixed to the top of the cast-in-situ bored pile; s2, a bridge frame is connected between the pile caps on the two sides in a bridging mode; and S3, splicing the middle section of the steel connecting bridge above the pile cap, moving the middle section of the steel connecting bridge to the connecting bridge frame, splicing two side sections of the steel connecting bridge, and fixing the two side sections with the middle section of the steel connecting bridge and the existing building respectively. According to the method, the hole is drilled above the metro, the outer sleeve pile casing is arranged, the cast-in-situ bored pile is constructed in the outer sleeve pile casing to serve as the pile foundation, stress is guaranteed, meanwhile, disturbance of pile foundation construction on soil around the metro station is greatly reduced, and the influence of steel connecting bridge construction on the metro station below is avoided.

Description

Technical Field

[0001] The invention relates to the field of building construction, and in particular to a method for constructing a steel bridge across a road above a subway. Background Art

[0002] In the prior art, when constructing a steel bridge above a subway, it is necessary to set up a pile foundation on the road above the subway. If the pile foundation is insufficient, it may cause foundation settlement during later construction, and the force will be transmitted to the subway station building, which will cause the subway station building and subway tracks to settle, posing a safety hazard to public transportation. Therefore, it is necessary to set up sufficient pile foundations on the road above the subway to ensure the bearing capacity of the steel bridge. However, if a large number of traditional prefabricated piles are constructed above the subway, the soil around the subway station may be squeezed and disturbed, and the soil will further squeeze the subway station, affecting the subway station. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a method for constructing a steel bridge across the road above the subway. Holes are drilled on the surrounding roads above the subway and an outer casing is set. Bored piles are constructed inside the outer casing. Bored piles are used as pile foundations. While ensuring the force, the disturbance of the soil around the subway station caused by the pile foundation construction is greatly reduced, thereby avoiding the impact of the steel bridge construction on the subway station below.

[0004] The present invention provides a method for constructing a steel bridge across a road above a subway, wherein the steel bridge wall is connected between existing buildings on both sides of the road, and the subway is located below the road, and the method comprises the following steps:

[0005] S1. constructing pile foundations on both sides of the road and avoiding the subway, wherein the construction steps of the pile foundation on each side include: drilling a plurality of grouting holes, providing a plurality of casings, and placing the plurality of casings into the plurality of grouting holes one by one, then tying steel bars in the casings and pouring concrete to form a plurality of bored piles; fixing a pile cap on the top of the plurality of bored piles;

[0006] S2, connecting a bridge frame between the pile caps on both sides, and making the road below the bridge frame meet traffic conditions;

[0007] S3. Splice the middle section of the steel bridge above the pile cap, and move the spliced ​​middle section of the steel bridge to the bridge frame, and then splice two side sections of the steel bridge above the two pile caps respectively, and fix the two side sections of the steel bridge to the middle section of the steel bridge and the adjacent existing buildings respectively, so as to form a complete steel bridge.

[0008] A further improvement of the present invention is that when splicing the middle section of the steel connecting bridge, a segmented splicing method is adopted, and the sections are moved to the connecting bridge frame one by one, and the adjacent sections are spliced ​​and fixed end to end.

[0009] A further improvement of the present invention is that after the pile cap is constructed and before the bridge is connected across, the pile cap is fixedly connected to an adjacent existing building through a buttress beam.

[0010] A further improvement of the present invention is that the spliced ​​middle section of the steel connecting bridge is moved to the connecting bridge frame in a hanging manner.

[0011] The present invention discloses a method for constructing a steel bridge across a road above a subway. The method avoids subway drillings and arranges outer casings on both sides of the road above the subway, constructs bored piles inside the outer casings, and uses bored piles as pile foundations. While ensuring force, the disturbance of the soil around the subway station by the pile foundation construction is greatly reduced, and the influence of the steel bridge construction on the subway station below is avoided. In addition, the present invention constructs the steel bridge by splicing sections on both sides of the road and transporting the middle section, which does not affect the passage of the middle road and has higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A top view of a steel bridge of a method for constructing a steel bridge across a road above a subway according to the present invention;

[0013] Figure 2 A front view of a steel bridge of a method for constructing a steel bridge across a road above a subway according to the present invention;

[0014] In the figure: 1. bored cast-in-place piles; 2. steel connecting bridge; 3. column cap; 4. subway crown beam; 5. subway ground-connected wall; 6. subway structural wall; 7. existing building; 8. connecting bridge frame; 9. subway; 10. supporting wall beam. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] like Figure 1-2 As shown, a method for constructing a steel bridge across a road above a subway, wherein a steel connecting wall 2 is connected between existing buildings 7 on both sides of the road, and a subway 9 is located below the road, comprises the following steps:

[0017] S1. Pile foundations are constructed on both sides of the road and away from the subway 9. The construction steps of the pile foundation on each side include: drilling a number of grouting holes, providing a number of casings, and placing the casings one by one into the number of grouting holes, then tying steel bars in the casings and pouring concrete to form a number of bored piles 1; and fixing a pile cap 3 on the top of the number of bored piles 1.

[0018] In this embodiment, the subway outer wall includes a subway crown beam 4, a subway ground connection wall 5 and a subway structural wall 6 from the outside to the inside.

[0019] S2. Connect the connecting bridge frame 8 between the pile caps on both sides, and make the road below the connecting bridge frame 8 meet the traffic conditions.

[0020] S3. Splice the middle section of the steel bridge above the pile cap 3, and move the spliced ​​middle section of the steel bridge to the bridge frame 8, then splice two side sections of the steel bridge above the two pile caps 3, and fix the two side sections to the middle section of the steel bridge and the adjacent existing buildings, respectively, to form a complete steel bridge 8.

[0021] Preferably, if Figure 2 As shown, when splicing the middle section of the steel bridge, a segmented splicing method is adopted, and the sections are moved to the bridge frame 8 one by one, and the adjacent sections are spliced ​​and fixed end to end. In this embodiment, the middle section of the bridge is divided into the second section, the third section, and the fifth section. During construction, the fifth section, the third section, and the second section are spliced ​​in sequence and transported to the bridge frame 8 in sequence. The side sections of the bridge are the first section and the sixth section respectively. After the splicing of the middle section of the bridge is completed, the first section is connected to the second section, the sixth section is connected to the fifth section, and the first section and the sixth section are each connected to an adjacent existing building.

[0022] Preferably, when the erected middle section of the connecting bridge is moved to the corresponding position of the connecting bridge frame 8, the middle section of the connecting bridge section can be moved by hoisting.

[0023] like Figure 2 As shown, after the construction of the pile cap 3 is completed and before the bridge frame 8 is connected across, the pile cap 3 is connected to the existing building through the supporting wall beam 10.

[0024] Preferably, in this embodiment, the diameter of the bored pile 1 is 1000mm and the pile length is 48m, ensuring that the force of the column is transmitted to the bottom of the subway station building without affecting the subway. The outer steel casing has a wall thickness of 25mm and a buried depth of 12m. A full casing drilling rig is used on site for construction. Micro-disturbance construction is performed in the subway special protection area.

[0025] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for constructing a steel bridge across a road above a subway, wherein the steel bridge wall is connected between existing buildings on both sides of the road, and the subway is located below the road, characterized in that: The following steps are involved: S1. constructing pile foundations on both sides of the road and avoiding the subway, wherein the construction steps of the pile foundation on each side include: drilling a plurality of grouting holes, providing a plurality of casings, and placing the plurality of casings into the plurality of grouting holes one by one, then tying steel bars in the casings and pouring concrete to form a plurality of bored piles; fixing a pile cap on the top of the plurality of bored piles; S2, connecting a bridge frame between the pile caps on both sides, and making the road below the bridge frame meet traffic conditions; S3. Splice the middle section of the steel bridge above the pile cap, and move the spliced ​​middle section of the steel bridge to the bridge frame, and then splice two side sections of the steel bridge above the two pile caps respectively, and fix the two side sections of the steel bridge to the middle section of the steel bridge and the adjacent existing buildings respectively, so as to form a complete steel bridge.

2. A method for constructing a steel bridge across a road above a subway as claimed in claim 1, characterized in that: When splicing the middle section of the steel connecting bridge, a segmented splicing method is adopted, and the sections are moved onto the connecting bridge frame one by one, and the adjacent sections are spliced ​​and fixed end to end.

3. A method for constructing a steel bridge across a road above a subway as claimed in claim 1, characterized in that: After the pile cap is constructed and before the connecting bridge is bridged, the pile cap is fixedly connected to the adjacent existing building through a supporting wall beam.

4. A method for constructing a steel bridge across a road above a subway as claimed in claim 1, characterized in that: The assembled middle section of the steel connecting bridge is moved to the connecting bridge frame in a hanging manner.

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