Framing demolition reconstruction structure of existing bridge

Abstract

The utility model provides a framing demolition reconstruction structure of an existing bridge, the reconstruction structure comprises an old bridge middle structure, the old bridge middle structure comprises piers, a cover beam and a bridge floor, and a bidirectional multi-lane is formed on the bridge floor to meet normal traffic; the left temporary support and the right temporary support are respectively arranged on the left side and the right side of the old bridge middle structure; the newly-built left bridge is built at the position where the left side of the old bridge is dismantled, and the newly-built left bridge is located on the left side of the middle structure of the old bridge. The newly-built right-side bridge is built at the position where the right side of the old bridge is dismantled, the newly-built right-side bridge is located on the right side of the middle structure of the old bridge, and a construction space exists between the middle structure of the old bridge and the newly-built left-side bridge and between the middle structure of the old bridge and the newly-built right-side bridge in the transverse direction and is suitable for dismantling the middle structure of the old bridge and building a middle new bridge.

Description

Technical Field

[0001] The utility model belongs to the field of highway bridge demolition, in particular to an in-situ demolition and reconstruction method of an existing ground operating sectional bridge. Background Art

[0002] With the increase of urban traffic flow, urban traffic has become more and more complex, and the traffic network has problems such as road congestion and declining service levels. Long-term used bridge structures may have problems such as aging and cracking of the bridge deck. Over time, these problems gradually affect the normal passage of the bridge and lose the economic value of repair and reinforcement. In this case, in order to meet the growing driving demand, it is necessary to demolish the old bridge and build a new one. The current common method is to demolish the old bridge first and then build a new bridge. However, when the bridge is demolished and rebuilt on the spot in a busy section of the road, the demolition first and then the construction will cause a sharp increase in surrounding traffic pressure. The appearance of a large number of construction vehicles will cause traffic jams, increase safety hazards, generate noise and dust, and have a negative impact on the image of the construction. In areas with dense traffic, the construction process cannot close the traffic for a long time, and vehicles must be allowed to pass. Utility Model Content

[0003] The utility model provides a section-by-section dismantling and reconstruction structure for an existing bridge, the reconstruction structure comprising:

[0004] The middle structure of the old bridge includes piers, cap beams and a bridge deck, and the bridge deck is composed of two-way multi-lane to meet normal traffic conditions;

[0005] The left temporary support and the right temporary support are respectively arranged on the left and right sides of the middle structure of the old bridge;

[0006] A new left bridge is built at the location after the left side of the old bridge is demolished, and the new left bridge is located on the left side of the middle structure of the old bridge;

[0007] The newly built right-side bridge is built at the location after the right side of the old bridge is demolished. The newly built right-side bridge is located on the right side of the middle structure of the old bridge. There is construction space along the horizontal direction between the middle structure of the old bridge and the newly built left-side bridge and the newly built right-side bridge. The construction space is suitable for the demolition of the middle structure of the old bridge and the construction of the new bridge in the middle.

[0008] In some embodiments, both sides of the newly built left bridge have a first temporary support and a second temporary stop respectively;

[0009] In some embodiments, both sides of the newly built right bridge are provided with a third temporary support and a fourth temporary stopper respectively.

[0010] In some embodiments, the newly built left bridge and the newly built right bridge form a temporary two-way multi-lane road to meet traffic needs.

[0011] In some embodiments, at least portions of the newly built left bridge and the newly built right bridge are suitable for being constructed as pedestrian walkways.

[0012] In some embodiments, the sides of the newly built left bridge and the newly built right bridge away from the new middle bridge constitute the newly built left bridge sidewalk and the newly built right bridge sidewalk.

[0013] In some embodiments, the new middle bridge includes a new left section of the middle bridge and a new right section of the middle bridge that are constructed in left and right sections.

[0014] The utility model proposes a structure for dismantling an existing bridge in sections, which first dismantles the left and right sides of the old bridge, retains the middle bridge deck, and meets the traffic demand of the middle lane. New bridges are then built on both sides, allowing vehicles to pass through the newly built bridge sections on both sides, and then the middle old bridge is dismantled. Finally, vehicles pass through the newly built middle bridge section, and ancillary structures such as sidewalks on both sides of the bridge section are constructed. The reconstruction structure provided by the utility model makes full use of the original piers, beams, bridge deck and other structures of the old bridge as a temporary structure for the construction of the new bridge, and maximizes the use of existing resources to complete the construction of the new bridge. Through a flexible traffic maintenance plan, normal traffic on the road is guaranteed, and fast and efficient road occupation construction is achieved. On the premise of ensuring safety, the construction period and the time the bridge is closed for traffic are reduced. In addition, the reconstruction structure provided by the present invention is suitable for on-site construction and can be carried out efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the cross-section of the original old bridge;

[0016] Figure 2 Cross-section diagram of both sides of the old bridge for demolition;

[0017] Figure 3 This is the cross-section diagram of the new bridge on both sides;

[0018] Figure 4 The middle section of the old bridge is demolished;

[0019] Figure 5 This is the cross-section diagram of the new central bridge and the renovation of both sides.

[0020] Among them, mark:

[0021] 1. The left side of the old bridge (sidewalk); 2. The middle structure of the old bridge (six lanes in both directions); 3. The right side of the old bridge (sidewalk); 4. The beams and slabs on the left side of the old bridge; 5. The cap beams on the left side of the old bridge; 6. The pile foundation on the left side of the old bridge; 7. The beams and slabs on the right side of the old bridge; 8. The cap beams on the right side of the old bridge; 9. The pile foundation on the right side of the old bridge; 10. Temporary support; 11. The new left bridge; 12. The new right bridge; 13. The new left span of the middle bridge; 14. The new right span of the middle bridge; 15. The new sidewalk of the left bridge; 16. The new sidewalk of the right bridge. DETAILED DESCRIPTION

[0022] See also Figure 3 The present embodiment provides a structure for dismantling and rebuilding an existing bridge in sections, the reconstruction structure includes multiple structures, specifically including a middle structure 2 of an old bridge, a left temporary support and a right temporary support (10, a newly built left bridge 11 and a newly built right bridge 12, the middle structure of the old bridge includes piers, a cap beam and a bridge deck, the bridge deck forms a two-way multi-lane to meet normal traffic, the left temporary support and the right temporary support are respectively arranged on the left and right sides of the middle structure 2 of the old bridge; the newly built left bridge 11 is built at the position after the left side 1 of the old bridge is dismantled, and the newly built left bridge 11 is located on the left side of the middle structure 2 of the old bridge; the newly built right bridge 12 is built at the position after the right side 3 of the old bridge is dismantled, and the newly built right bridge 12 is located on the right side of the middle structure 2 of the old bridge, and there is a construction space in the transverse direction between the middle structure 2 of the old bridge and the newly built left bridge 11 and the newly built right bridge 12, and the construction space is suitable for the dismantling of the middle structure 2 of the old bridge and the construction of the new bridge in the middle.

[0023] The utility model divides the old bridge into three parts: the left side, the middle part, and the right side (the middle part is a two-way six-lane road, and the two sides are sidewalks), retains the original structure of the middle part (driving lane), and dismantles the upper beams and lower cap beam pile foundations on both sides (sidewalks) of the old bridge to ensure the normal traffic of the middle bridge, and then builds two new outer bridges. Through traffic organization, social vehicles can pass through the newly built bridges on both sides, and the middle old bridge is dismantled. Finally, a new bridge in the middle is built to allow social vehicles to pass through the newly built middle bridge, and auxiliary structures such as sidewalks on both sides of the bridge are constructed.

[0024] Specifically, both sides of the newly built left bridge 11 are respectively provided with a first temporary support and a second temporary stop.

[0025] The two sides of the newly built right bridge 12 are respectively provided with a third temporary support and a fourth temporary stop.

[0026] The newly built left bridge 11 and the newly built right bridge 12 form a temporary two-way multi-lane to meet the traffic needs. The newly built left bridge 11 and the newly built right bridge 12 are at least partially suitable for being constructed as a pedestrian walkway.

[0027] In this embodiment, the middle new bridge includes a newly built left bridge 13 and a newly built right bridge 14 constructed in left and right sections. The sides of the newly built left bridge 11 and the newly built right bridge 12 away from the middle new bridge constitute a newly built left bridge sidewalk 15 and a newly built right bridge sidewalk 16.

[0028] The utility model proposes a structure for dismantling an existing bridge in sections, which first dismantles the left and right sides of the old bridge, retains the middle bridge deck, and meets the traffic demand of the middle lane. New bridges are then built on both sides, allowing vehicles to pass through the newly built bridge sections on both sides, and then the middle old bridge is dismantled. Finally, vehicles pass through the newly built middle bridge section, and ancillary structures such as sidewalks on both sides of the bridge section are constructed. The reconstruction structure provided by the utility model makes full use of the original piers, beams, bridge deck and other structures of the old bridge as a temporary structure for the construction of the new bridge, and maximizes the use of existing resources to complete the construction of the new bridge. Through a flexible traffic maintenance plan, normal traffic on the road is guaranteed, and fast and efficient road occupation construction is achieved. On the premise of ensuring safety, the construction period and the time the bridge is closed for traffic are reduced. In addition, the reconstruction structure provided by the present invention is suitable for on-site construction and can be carried out efficiently.

[0029] This embodiment further provides a method for dismantling and rebuilding an existing bridge in sections, and the construction steps are as follows:

[0030] Step 1: Construction preparation. Before construction, conduct a comprehensive on-site survey to familiarize yourself with the construction environment. According to the demolition plan for both sides, demolish the bridge in sections, and divide the bridge into three sections: left, middle, and right (the middle section is a two-way six-lane road, and both sides are sidewalks). See attached. Figure 1 The bending and shear bearing capacity of the retained inner bridge deck cap beam and piers are checked, as well as the width of the cracks in the cap beam and the bearing capacity of the bridge piles under normal use.

[0031] Step 2: Demolish the old bridge on both sides. Keep the original piers, beams, bridge deck and other structures in the middle of the old bridge, make temporary support for the middle of the old bridge, ensure that the middle of the old bridge (two-way six-lane) meets the normal traffic conditions, and then demolish the two sides of the old bridge (sidewalks). The demolition order is: ancillary facilities → bridge deck → beam slab → cap beam → pile foundation. See attached for the status of the demolition completion. Figure 2 .

[0032] Step 3: Build new bridges on both sides. Build two new outer bridges, each with a width of 2×8 meters. As a two-way four-lane temporary traffic, the construction sequence is: pile foundation → pier → beam slab → bridge deck → ancillary facilities. See the attached for the completion status of the new construction. Figure 3 .

[0033] Step 4: Demolition of the inner side of the old bridge. After the new bridge is completed, private vehicles will pass through the newly built two-way four-lane bridge, and the inner side of the old bridge will be demolished at the same time. Demolition order: auxiliary facilities → bridge deck → beam slab → cap beam → pile foundation. The demolition method is the same as step 2. See attached for the demolition status. Figure 4 .

[0034] Step 5: Build a new inner bridge. The construction method is the same as step 3. The construction status is shown in the attached Figure 5 .

[0035] Step 6: Construction of ancillary facilities of the new bridge on both sides. After the construction of the inner new bridge is completed, private vehicles will pass through the newly built middle bridge span, with six lanes in both directions, and ancillary structures such as sidewalks on both sides of the bridge span will be constructed. The ancillary facilities mainly include sidewalks, railings, asphalt pavement, anti-collision guardrails, expansion joints, bridge deck leveling layers, drainage pipes, and street lights.

[0036] The utility model solves the need for dismantling and rebuilding existing bridges and the need for maintaining operations during dismantling. By using the original piers, beams, bridge decks and other structures of the old bridge as temporary structures for the construction of the new bridge, the existing resources are used to the maximum extent to complete the construction of the new bridge. Through a detailed and perfect traffic organization plan during the construction period, the normal driving of the road is guaranteed, and the fast and efficient construction of the road occupation is achieved. On the premise of ensuring safety, the construction period and the time of the bridge closing traffic are reduced. That is, the smooth traffic is guaranteed, and the construction quality is guaranteed.

Claims

1. A structure for dismantling and rebuilding an existing bridge in sections, characterized in that: The reconstruction structure includes: The middle structure of the old bridge includes piers, cap beams and a bridge deck, and the bridge deck is composed of two-way multi-lane to meet normal traffic conditions; The left temporary support and the right temporary support are respectively arranged on the left and right sides of the middle structure of the old bridge; the newly built left bridge is built at the location after the left side of the old bridge is demolished, and the newly built left bridge is located on the left side of the middle structure of the old bridge; The newly built right-side bridge is built at the location after the right side of the old bridge is demolished. The newly built right-side bridge is located on the right side of the middle structure of the old bridge. There is construction space along the horizontal direction between the middle structure of the old bridge and the newly built left-side bridge and the newly built right-side bridge. The construction space is suitable for the demolition of the middle structure of the old bridge and the construction of the new bridge in the middle.

2. The structure for dismantling and rebuilding an existing bridge in sections according to claim 1 is characterized in that: Both sides of the newly built left bridge are respectively provided with a first temporary support and a second temporary stop.

3. The structure for dismantling and rebuilding an existing bridge in sections according to claim 2 is characterized in that: There are third temporary supports and fourth temporary stops on both sides of the newly built right bridge.

4. The structure for dismantling and rebuilding an existing bridge in sections according to claim 3 is characterized in that: The newly built left bridge and the newly built right bridge form a temporary two-way multi-lane road to meet the traffic needs.

5. The structure for dismantling and rebuilding an existing bridge in sections according to claim 2, characterized in that: The newly built left bridge and the newly built right bridge are at least partially suitable for being constructed as pedestrian walkways.

6. The structure for dismantling and rebuilding an existing bridge in sections according to claim 1, characterized in that: The new middle bridge includes a newly built left section of the middle bridge and a newly built right section of the middle bridge which are constructed in left and right sections.

7. The structure for dismantling and rebuilding an existing bridge in sections according to claim 5, characterized in that: The sides of the newly built left bridge and the newly built right bridge away from the middle new bridge constitute the newly built left bridge sidewalk and the newly built right bridge sidewalk.

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