Construction method of steel continuous bridge across road above subway

Abstract

The application relates to a steel continuous bridge construction method for crossing a road above a subway, which comprises the following steps: S1, pile foundations are constructed on both sides of the road and away from the subway, and the construction steps of the pile foundations on each side comprise the following steps: a bored hole is drilled, a casing is provided, the casing is lowered into the bored hole, steel bars are bound in the casing, and concrete is poured to form a bored pile; a pile cap is fixed on the top of the bored pile; S2, a continuous bridge frame is connected between the pile caps on both sides; S3, the middle section of the steel continuous bridge is spliced above the pile caps, the middle section of the steel continuous bridge is moved to the continuous bridge frame, two side sections of the steel continuous bridge are spliced, and the two side sections are fixed with the middle section of the steel continuous bridge and existing buildings respectively. The bored hole is drilled above the subway, the casing is arranged, the bored pile is constructed in the casing as the pile foundation, the disturbance of the pile foundation construction to the soil around the subway station is greatly reduced while the stress is ensured, and the influence of the steel continuous bridge construction on the subway station below is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building construction, in particular to a steel continuous bridge construction method for crossing over the road above the subway. BACKGROUND

[0002] In the prior art, when constructing a steel continuous bridge above the subway, pile foundations need to be set on the road above the subway. If the pile foundations are insufficient, foundation settlement may occur during later construction, which will transmit force to the subway station building and cause the subway station building and the subway track to settle, thereby causing a safety hazard to public transportation. Therefore, sufficient pile foundations need to be set on the road above the subway to ensure the bearing capacity of the steel continuous bridge. However, if a large number of traditional precast piles are constructed above the subway, the surrounding soil of the subway station may be disturbed due to extrusion, which further extrudes the subway station and affects the subway station. SUMMARY

[0003] To solve the above problems, the present application provides a steel continuous bridge construction method for crossing over the road above the subway. Drill holes in the surrounding road above the subway and set sleeve casings, and then construct bored piles in the sleeve casings. Use the bored piles as pile foundations to significantly reduce the disturbance of the pile foundation construction to the surrounding soil of the subway station while ensuring the force transmission, and avoid the influence of the steel continuous bridge construction on the subway station below.

[0004] The present application provides a steel continuous bridge construction method for crossing over the road above the subway. The steel continuous wall is connected between the existing buildings on both sides of the road, and the subway is located below the road. The method comprises the following steps:

[0005] S1. Construct pile foundations on both sides of the road and away from the subway. The construction steps of the pile foundations on each side comprise: drilling a plurality of pouring holes, providing a plurality of casings, and sequentially lowering the plurality of casings into the plurality of pouring holes, then binding steel bars in the casings and pouring concrete to form a plurality of bored piles; and fixing a pile cap on the top of the plurality of bored piles;

[0006] S2. Connect a continuous bridge frame between the pile caps on both sides, and make the road below the continuous bridge frame meet the traffic conditions;

[0007] S3. Assemble the middle section of the steel continuous bridge above the pile caps, move the assembled middle section of the steel continuous bridge to the continuous bridge frame, then assemble two side sections of the steel continuous bridge above the two pile caps respectively, and fix the two side sections of the steel continuous bridge to the middle section of the steel continuous bridge and the adjacent existing buildings respectively, thereby forming a complete steel continuous bridge.

[0008] A further improvement of the present application is that when assembling the middle section of the steel continuous bridge, the middle section is assembled in a segmented manner and moved to the continuous bridge frame section by section, and the adjacent sections are fixed end to end.

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

[0010] A further improvement of the present invention is that the assembled middle section of the steel bridge is moved onto the bridge frame by means of hoisting.

[0011] This invention discloses a construction method for a steel bridge spanning a road above a subway station. The method involves drilling holes on both sides of the road above the subway station, avoiding the subway, and installing outer casings. Drilled piles are then constructed within these casings, using them as the foundation. This significantly reduces the disturbance to the surrounding soil during pile foundation construction while ensuring load-bearing capacity, thus avoiding any impact on the subway station below. Furthermore, this invention employs a method of constructing the steel bridge by splicing sections together on both sides of the road and transporting the middle sections, ensuring uninterrupted traffic flow in the middle road and enhancing safety. Attached Figure Description

[0012] Fig. 1 This is a top view of a steel bridging bridge, which is a construction method for a steel bridging bridge spanning a road above a subway station according to the present invention.

[0013] Fig. 2 This is a front view of a steel bridging bridge, which is part of a construction method for a steel bridging bridge spanning a road above a subway station, according to the present invention.

[0014] In the diagram: 1. Drilled pile; 2. Steel bridge; 3. Column cap; 4. Subway cap beam; 5. Subway diaphragm wall; 6. Subway structural wall; 7. Existing building; 8. Cable tray; 9. Subway; 10. Buttress beam. Detailed Implementation

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

[0016] like Figs. 1-2 As shown, a construction method for a steel ties bridge spanning a road above a subway station is described, where a steel ties wall 2 spans between existing buildings 7 on both sides of the road, and the subway station 9 is located below the road. The method includes the following steps:

[0017] S1. Construct pile foundations on both sides of the road, avoiding the location of Metro 9. The construction steps for each pile foundation include: drilling several grouting holes, providing several casings, and placing the casings one by one into the several grouting holes, then binding steel bars and pouring concrete inside the casings to form several drilled piles 1; fixing a pile cap 3 on the top of the several drilled piles 1.

[0018] In this embodiment, the subway exterior wall includes, from the outside in, a subway capping beam 4, a subway diaphragm wall 5, and a subway structural wall 6.

[0019] S2. Connect the bridge frame 8 between the pile caps on both sides, and make the road under the bridge frame 8 passable.

[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 respectively, and fix the two side sections to the middle section of the steel bridge and the adjacent existing buildings respectively, so as to form a complete steel bridge 8.

[0021] Better, such as Fig. 2 As shown, when splicing the middle section of the steel bridge, a segmented splicing method is adopted, and each segment is moved to the bridge frame 8. The ends of adjacent segments are spliced ​​and fixed. In this embodiment, the middle section of the bridge is divided into the 2nd, 3rd and 5th segments. During construction, the 5th, 3rd and 2nd segments are spliced ​​in sequence and transported to the bridge frame 8 in sequence. The side segments of the bridge are the 1st and 6th segments. After the middle section of the bridge is spliced, the 1st segment is connected to the 2nd segment, the 6th segment is connected to the 5th segment, and the 1st and 6th segments are each connected to the adjacent existing buildings.

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

[0023] like Fig. 2 As shown, after the pile cap 3 is constructed and before the bridge span 8 is installed, the pile cap 3 is connected to the existing building via the 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 area below the subway station building without affecting the subway. The outer steel casing has a wall thickness of 25mm and a burial depth of 12m. On-site construction is carried out using a full-casing drilling rig. Minimally disturbed construction is implemented within the special protection zone of the subway.

[0025] Finally, it should be noted that the above are merely 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for constructing a steel bridge across a road above a subway, the steel bridge bridging between existing structures on both sides of the road, the subway being located below the road, characterized in that, The method comprises the following steps: S1, constructing pile foundations at positions on both sides of the road and away from the subway, and the construction steps of the pile foundations on each side comprise: drilling a plurality of pouring holes, providing a plurality of protection tubes, and correspondingly lowering the protection tubes into the pouring holes, then binding steel bars in the protection tubes and pouring concrete to form a plurality of bored piles; fixing a pile cap on the top of the bored piles; S2, connecting a bridge frame between the pile caps on both sides, and making the road below the bridge frame meet the traffic conditions; S3, splicing the middle section of the steel bridge on the pile caps, moving the spliced middle section of the steel bridge to the bridge frame, then splicing two side sections of the steel bridge on the pile caps respectively, and fixing the two side sections of the steel bridge with the middle section of the steel bridge and the adjacent existing building respectively, thereby forming a complete steel bridge; When splicing the middle section of the steel bridge, the splicing is performed in a segmented manner, and the segments are moved to the bridge frame one by one, and the adjacent segments are spliced and fixed at the head and tail; After the pile caps are constructed and before the bridge frame is connected, the pile caps are fixedly connected to the adjacent existing building through a supporting wall beam; The spliced middle section of the steel bridge is moved to the bridge frame in a hoisting manner.

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