Rapid shaping construction method for navigable river channel bridge

Abstract

The invention relates to the technical field of bridge construction, and discloses a navigation riverway bridge rapid shaping construction method which comprises the following steps: step 1) preliminarily determining the position of a bridge pile foundation, and drawing riverway widening lines at corresponding positions on two sides of a riverway; (2) pile inserting construction is conducted along the position of the widening line; (3) the original river channel line in the broadening line range is excavated; (4) bridge pile foundation construction; (5) a bearing platform is constructed; (6) bridge pier construction; (7) the cofferdam is dismantled; (8) constructing an anti-scouring structure of the bridge pier; (9) constructing a capping beam; (10) box girder construction; (11) constructing a bridge floor; the original riverway is subjected to partial broadening construction, the course of the riverway is not occupied, and normal navigation of the riverway is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a rapid finalized construction method for a navigable river bridge. Background Art

[0002] The Jiangnan region has a complex water system and developed shipping. The construction of navigable rivers usually aims to not affect the normal navigation of the rivers. Half-width construction or cable-stayed bridge construction is used to ensure normal navigation of the rivers.

[0003] Half-width construction reserves half of the river for navigation, and the other half is constructed. After construction of one half of the river is completed, navigation is restored, and then the other half is constructed. The cost of half-width construction is lower, but due to construction limitations, the construction period is relatively long, and it is not suitable for sections with short construction periods. The use of cable-stayed bridge structure does not affect river navigation, but the cost of cable-stayed bridges is expensive and the construction requirements are high. It is generally used for projects with large spans and sufficient funds.

[0004] In addition, due to the impact of ships passing through, the water level in the navigable river fluctuates greatly, and the erosion of bridge piers is also more frequent, which puts more pressure on the quality of the bridge.

[0005] To this end, the present invention proposes a rapid finalized construction method for a navigable river bridge. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a rapid finalized construction method for a navigable river bridge which has a reasonable structural design, does not affect the normal navigation of ships, and has good durability.

[0007] The technical solution of the present invention is as follows:

[0008] A rapid finalized construction method for a navigable river bridge comprises the following steps:

[0009] Step 1) Preliminarily determine the location of the bridge pile foundation and draw the river widening line at the corresponding positions on both sides of the river;

[0010] Step 2) Piling construction is carried out along the widening line. The pile insertion position should be outside the widening line on the side away from the river channel. Piling construction can be carried out simultaneously on both sides of the river channel.

[0011] Step 3) excavating the original river channel within the widening line, and the two sides of the river channel can be excavated simultaneously to form a widened river channel;

[0012] Step 4) Bridge pile foundation construction: construct the bridge pile foundation in the area between the original river channel and the widened river channel. The bridge pile foundation is constructed in the form of permanent steel casing + bored cast-in-place piles;

[0013] Step 5) Cap construction: Use bottomless caisson + bottom-sealing concrete to construct the cofferdam, then tie the cap steel bars, support the formwork, and pour concrete;

[0014] Step 6) Bridge pier construction: bridge piers are constructed in the form of no formwork + reinforced concrete;

[0015] Step 7) Remove the cofferdam, use the water balance method to fill the cofferdam with water, and lift the caisson away after the water pressure on both sides of the cofferdam is balanced;

[0016] Step 8) Construction of bridge pier anti-scour structure, using on-site prefabrication + vibration sinking method;

[0017] Step 9) Construction of cap beam: using formwork + reinforced concrete to construct the cap beam;

[0018] Step 10) The box beam is constructed by using a temporary and then permanent support method, and wet joint construction is performed on the box beam joints to form a continuous beam;

[0019] Step 11) Bridge deck construction: use waterproof layer + asphalt concrete to construct the bridge deck.

[0020] Furthermore, in step 1), the widening line is an arc line, the starting point of which is 10-20 m upstream of the bridge, and the end point of which is 10-20 m downstream of the bridge.

[0021] Furthermore, after the construction of step 8) is completed, a river defense line should be built along the widening line to restore the river line.

[0022] Furthermore, in the step 8) of constructing the bridge pier anti-scour structure, the bridge pier anti-scour structure should be 2-3m away from the bridge pile foundation.

[0023] Furthermore, the bridge pier anti-scour structure includes a bottom pile foundation and an upper diversion structure. The bottom pile foundation adopts a cylindrical pile structure with a cone tip, and the upper diversion structure adopts a triangular prism structure. Anti-tilt legs are provided between the bottom pile foundation and the upper diversion structure.

[0024] Furthermore, the top elevation of the bridge pier anti-scour structure needs to be 0.5-1m higher than the historical highest water level; and one tip of the triangular prism structure of the bridge pier anti-scour structure is located on the river channel axis, and the other two tips are located in the river channel width direction.

[0025] Furthermore, the specific process of step 5) is as follows:

[0026] 5.1) Use a floating crane to lift the bottomless caisson and place it above the bridge pile foundation;

[0027] 5.2) Lower the bottomless caisson and inject water into the interlayer of the caisson until it sinks to the designed elevation;

[0028] 5.3) Pour the cofferdam bottom sealing concrete into the caisson;

[0029] 5.4) Pump out the water in the caisson;

[0030] 5.5) Lower the tied cap reinforcement and the built cap formwork;

[0031] 5.6) Pour concrete into the formwork and lift it off the formwork after the concrete solidifies.

[0032] Furthermore, the step 7) bridge pier construction:

[0033] 7.1) Place the tied pier reinforcement cage and tie it with the cap reinforcement;

[0034] 7.2) Insert the hollow precast concrete bridge pier into the pier reinforcement cage from above;

[0035] 7.3) Tie the reserved steel bars at the bottom of the hollow precast concrete pier to the steel bars of the cap;

[0036] 7.4) Pour concrete into the hollow precast concrete piers.

[0037] 7.3) After the concrete solidifies, the pier construction is completed.

[0038] Furthermore, the specific process of step 4 is as follows:

[0039] 4.1) Bury the steel casing;

[0040] 4.2) Drilling to a predetermined hole depth;

[0041] 4.3) Hole cleaning operation;

[0042] 4.4) Hanging and placing the pile foundation reinforcement cage;

[0043] 4.5) Lower the catheter;

[0044] 4.6) pouring concrete;

[0045] 4.7) Lift the catheter;

[0046] 4.8) Construction completed.

[0047] Further, the step 10) box girder construction:

[0048] 10.1) Construct temporary supports on the cap beam;

[0049] 10.2) Lift the box girder onto the temporary support;

[0050] 10.3) Set up permanent supports between temporary supports;

[0051] 10.4) Make wet joints at the ends of the box beams to connect the box beams into a whole;

[0052] 10.5) Remove the temporary support and transfer the box girder as a whole to the permanent support;

[0053] 10.6) Complete box girder construction.

[0054] Furthermore, the hollow precast concrete pier adopts a cylindrical structure, a through hole penetrating from top to bottom is provided at the center of the hollow precast concrete pier, a plurality of strip-shaped reserved grooves are provided on the inner wall of the through hole along the circumferential direction, and reserved steel bars are provided at the bottom of the hollow precast concrete pier.

[0055] The beneficial effects of the present invention are as follows:

[0056] 1) Carry out partial widening of the original river channel to avoid occupying the river route and ensure the normal navigation of the river channel.

[0057] 2) After the original river channel is widened, the flow rate of the river water will decrease when passing through the widened area, reducing the impact of the water flow on the bridge piers.

[0058] 3) A pier anti-scour structure is set up on the outermost side of the bridge pile foundation to split the passing water flow and divert it to both sides of the pier, avoiding direct impact of the water flow on the pier.

[0059] 4) The river widening line is an arc line, which can push the water reaching the widening line along the arc line, avoiding the impact on the river channel.

[0060] 5) The box girder adopts the form of temporary support first and then permanent support, which ensures the integrity of the connection between the box girders and improves the bearing capacity of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic diagram of the original river channel of the present invention;

[0062] Figure 2 It is a schematic diagram of the widening line of the present invention;

[0063] Figure 3 It is a schematic diagram of the widened river channel of the present invention;

[0064] Figure 4 This is a completed diagram of the present invention;

[0065] Figure 5 It is a schematic diagram of the bottomless caisson structure of the present invention;

[0066] Figure 6 A schematic diagram of the anti-scour structure of a bridge according to the present invention;

[0067] Figure 7 This is a schematic diagram of the installation of the bridge anti-scour structure of the present invention;

[0068] Figure 8 This is a schematic diagram of the hollow prefabricated pier structure of the present invention. DETAILED DESCRIPTION

[0069] The present invention is further described below in conjunction with the accompanying drawings.

[0070] A rapid finalized construction method for a navigable river bridge, the specific construction steps are as follows:

[0071] Step 1) Preliminarily determine the location of the bridge pile foundation and draw the river widening line at the corresponding position on both sides of the river, such as Figure 1 , 2 As shown;

[0072] The widening line is set according to the actual location of the river and government planning requirements, and the construction space of a bridge pier is increased as much as possible, so that the original ship route does not need to be adjusted and the normal shipping function is retained;

[0073] The widening line is an arc line, with the starting point 12m upstream of the bridge and the end point 12m downstream of the bridge.

[0074] Step 2) Piling construction is performed along the widening line, and the two sides of the river channel can be carried out simultaneously; in this embodiment, the piling is preferably located outside the widening line, so as to ensure that the widening width meets the project requirements.

[0075] Step 3) excavate the original river channel within the widening line, and the two sides of the river channel can be excavated simultaneously; in this embodiment, an excavator is used to excavate along the bank; Figure 3 As shown, the process of step 1) to step 3) above realizes the widening construction of the original river channel. After the widening construction is completed, the bridge pile foundation can be extended to both sides of the widening position. Although the span is increased to a certain extent, it avoids affecting or occupying the ship route and does not affect the entire construction progress.

[0076] Step 4) Bridge pile foundation construction: The bridge pile foundation is constructed in the area between the original river channel and the widened river channel. The bridge pile foundation is constructed in the form of permanent steel casing + bored cast-in-place piles;

[0077] 4.1) burying permanent steel casing; 4.2) drilling to the predetermined hole depth; 4.3) hole cleaning operation; 4.4) hanging steel cage; 4.5) lowering the guide tube; 4.6) pouring concrete; 4.7) lifting the guide tube;

[0078] 4.8) Construction is completed. The permanent steel casing can effectively protect the bridge pile foundation, so the present invention only needs to consider the anti-scouring protection of the bridge pier.

[0079] Step 5) Construction of the foundation: Use bottomless caisson + bottom concrete to construct the cofferdam, then tie the foundation steel bars, support the formwork, and pour concrete. Figure 6 As shown;

[0080] 5.1) Use a floating crane to lift the bottomless caisson and place it above the bridge pile foundation;

[0081] 5.2) Lower the bottomless caisson and inject water into the interlayer of the caisson until it sinks to the designed elevation (if the height of a single caisson is not enough, caissons can be stacked for use);

[0082] 5.3) Pour the cofferdam bottom sealing concrete into the caisson;

[0083] 5.4) Pump out the water in the caisson;

[0084] 5.5) Lower the tied cap reinforcement and tie it to the pile foundation reinforcement;

[0085] 5.6) Lower the built foundation template, position and fix the template;

[0086] 5.6) Pour concrete into the formwork, and after the concrete solidifies, lift it off the formwork;

[0087] The entire foundation construction process is standardized, which is conducive to improving the progress of construction.

[0088] Step 6) Bridge pier construction: Use the form of no formwork + reinforced concrete to construct the bridge pier, such as Figure 8 As shown;

[0089] 6.1) Place the tied pier reinforcement cage and tie it with the cap reinforcement;

[0090] 6.2) Insert the hollow precast concrete pier into the pier reinforcement cage from above;

[0091] 6.3) Tie the reserved steel bars at the bottom of the hollow precast concrete pier to the steel bars of the cap;

[0092] 6.4) Pour concrete into the hollow precast concrete piers.

[0093] 6.5) After the concrete solidifies, the pier construction is completed;

[0094] The bridge pier construction without formwork can reduce the time of formwork and formwork removal and improve the construction progress. On the other hand, the precast concrete piers can be precast in a high-grade concrete factory, which can play a better protective role. The bottom of the hollow precast concrete pier in this embodiment is provided with reserved steel bars, and the inner wall of the hollow circular hole is provided with reserved grooves to strengthen the combination of precast + cast-in-place.

[0095] Step 7) Remove the cofferdam, use the water balance method to fill the cofferdam with water, and lift the caisson away after the water pressure on both sides of the cofferdam is balanced;

[0096] In order to ensure the anti-scouring of the bridge pier position, the present invention is specially provided with a bridge pier anti-scouring structure, which is composed of two parts, one part is a bottom pile foundation, and the other part is an upper diversion structure. The bottom pile foundation adopts a cylindrical pile with a cone tip, and the upper diversion structure adopts a triangular prism structure. Three anti-tilting legs are arranged between the bottom pile foundation and the upper diversion structure, and the three anti-tilting legs are evenly arranged at intervals of 120°.

[0097] Step 8) Construction of the bridge pier anti-scour structure, which is constructed by on-site prefabrication + vibration sinking; the bridge pier anti-scour structure is sunk to the designed elevation by a vibration pile driver, and the top elevation of the bridge pier anti-scour structure needs to be 0.5-1m higher than the historical highest water level, preferably 0.8m; the bridge pier anti-scour structure is required to be 2-3m away from the bridge pile foundation, preferably 2.4m;

[0098] Before the vibration sinking construction, the sinking position must be aligned to ensure that one tip of the triangular prism structure of the pier anti-scour structure is located on the axis of the river channel, and the other two tips are located in the width direction of the river channel.

[0099] Step 9) Construction of cap beam: using formwork + reinforced concrete to construct the cap beam;

[0100] 9.1) Tie the cap beam reinforcement;

[0101] 9.2) Build cap beam formwork;

[0102] 9.3) pouring concrete;

[0103] 9.4) Remove the formwork after the concrete solidifies;

[0104] 9.5) Complete the cap beam construction;

[0105] The construction of the cap beam is a routine construction and will not be elaborated here.

[0106] Step 10) The box beam is constructed by using a temporary and then permanent support method, and wet joint construction is performed on the box beam joints to form a continuous beam;

[0107] 10.1) Construct temporary supports on the cap beam;

[0108] 10.2) Lift the box girder onto the temporary support;

[0109] 10.3) Set up permanent supports between temporary supports;

[0110] 10.4) Make wet joints at the ends of the box beams to connect the box beams into a whole;

[0111] 10.5) Remove the temporary support and transfer the box girder as a whole to the permanent support;

[0112] 10.6) Complete box girder construction.

[0113] Different from traditional bridge construction, the present invention connects the box girders as a whole to avoid the risk of the box girder falling off or overturning due to scouring and vibration of the bridge piers by water flow or excessive load on the upper part of the bridge deck.

[0114] Step 11) Bridge deck construction: use waterproof layer + asphalt concrete to construct the bridge deck.

[0115] 11.1) Construction of bridge deck pavement structure;

[0116] 11.2) Construction of bridge deck sidewalk;

[0117] 11.3) Construction of bridge deck railings and lighting facilities;

[0118] 11.4)Construct bridge deck drainage facilities.

[0119] The final bridge construction was completed as Figure 4 As shown, the bridge piers are arranged along the direction of the river flow, and the bridge deck is arranged along the direction of the road, forming an oblique form.

[0120] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A method for rapid finalization of construction of a navigable river bridge, characterized in that: The steps include: Step 1) Preliminarily determine the location of the bridge pile foundation and draw the river widening line at the corresponding positions on both sides of the river; Step 2) Piling construction is carried out along the widening line. The pile insertion position should be outside the widening line on the side away from the river channel. Piling construction can be carried out simultaneously on both sides of the river channel. Step 3) excavating the original river channel within the widening line, and the two sides of the river channel can be excavated simultaneously to form a widened river channel; Step 4) Bridge pile foundation construction: construct the bridge pile foundation in the area between the original river channel and the widened river channel. The bridge pile foundation is constructed in the form of permanent steel casing + bored cast-in-place piles; Step 5) Cap construction: Use bottomless caisson + bottom-sealing concrete to construct the cofferdam, then tie the cap steel bars, support the formwork, and pour concrete; Step 6) Bridge pier construction: bridge piers are constructed in the form of no formwork + reinforced concrete; Step 7) Remove the cofferdam, use the water balance method to fill the cofferdam with water, and lift the caisson away after the water pressure on both sides of the cofferdam is balanced; Step 8) Construction of bridge pier anti-scour structure, using on-site prefabrication + vibration sinking method; Step 9) Construction of cap beam: using formwork + reinforced concrete to construct the cap beam; Step 10) The box beam is constructed by using a temporary and then permanent support method, and wet joint construction is performed on the box beam joints to form a continuous beam; Step 11) Bridge deck construction: use waterproof layer + asphalt concrete to construct the bridge deck.

2. A method for rapid finalization of construction of a navigable river bridge according to claim 1, characterized in that: In the step 1), the widening line is an arc line, the starting point is located 10-20m upstream of the bridge, and the end point is located 10-20m downstream of the bridge.

3. The method for rapid finalization of construction of a navigable river bridge according to claim 1, characterized in that: After the construction of step 8) is completed, a river defense line should be built along the widening line to restore the river line.

4. The method for rapid finalization of construction of a navigable river bridge according to claim 1, characterized in that: In the step 8) of constructing the bridge pier anti-scour structure, the bridge pier anti-scour structure should be 2-3m away from the bridge pile foundation.

5. The method for rapid finalization of construction of a navigable river bridge according to claim 1, characterized in that: The bridge pier anti-scour structure includes a bottom pile foundation and an upper diversion structure. The bottom pile foundation adopts a cylindrical pile structure with a cone tip, and the upper diversion structure adopts a triangular prism structure. Anti-tilt legs are provided between the bottom pile foundation and the upper diversion structure.

6. The method for rapid finalization of construction of a navigable river bridge according to claim 1, characterized in that: The top elevation of the bridge pier anti-scour structure needs to be 0.5-1m higher than the historical highest water level; and one tip of the triangular prism structure of the bridge pier anti-scour structure is located on the river channel axis, and the other two tips are located in the river channel width direction.

7. The method for rapid finalization of construction of a navigable river bridge according to claim 1, characterized in that: The specific process of step 5) is as follows: 5.1) Use a floating crane to lift the bottomless caisson and place it above the bridge pile foundation; 5.2) Lower the bottomless caisson and inject water into the interlayer of the caisson until it sinks to the designed elevation; 5.3) Pour bottom sealing concrete into the caisson; 5.4) Pump out the water in the caisson; 5.5) Lower the tied cap reinforcement and the built cap formwork; 5.6) Pour concrete into the formwork and lift it off the formwork after the concrete solidifies.

8. The method for rapid finalization of construction of a navigable river bridge according to claim 1, characterized in that: Step 6) Pier construction: 6.1) Place the tied pier reinforcement cage and tie it with the cap reinforcement; 6.2) Insert the hollow precast concrete pier into the pier reinforcement cage from above; 6.3) Tie the reserved steel bars at the bottom of the hollow precast concrete pier to the steel bars of the cap; 6.4) Pour concrete into the hollow precast concrete piers. 6.5) After the concrete solidifies, the pier construction is completed.

9. A method for rapid finalization of construction of a navigable river bridge according to claim 8, characterized in that: The hollow precast concrete pier adopts a cylindrical structure. A through hole is provided at the center of the hollow precast concrete pier, which runs through the pier from top to bottom. A plurality of strip-shaped reserved grooves are provided on the inner wall of the through hole along the circumferential direction. Reserved steel bars are provided at the bottom of the hollow precast concrete pier.

10. The method for rapid finalization of construction of a navigable river bridge according to claim 1, characterized in that: Step 10) Box girder construction: 10.1) Construct temporary supports on the cap beam; 10.2) Lift the box girder onto the temporary support; 10.3) Set up permanent supports between temporary supports; 10.4) Make wet joints at the ends of the box beams to connect the box beams into a whole; 10.5) Remove the temporary support and transfer the box girder as a whole to the permanent support; 10.6) Complete box girder construction.

Images