Traffic guiding and changing method for construction of junction interchange road

Abstract

The invention discloses a traffic guidance and modification method for construction of a junction interchange road. The traffic guidance and modification method comprises the following three steps: in a construction stage before traffic guidance and modification, firstly constructing a traffic-keeping ramp; in the traffic guiding and changing construction stage, the main road section between the two diversion noses of the existing highway is closed, the two-way traffic vehicles of the existing highway are guided into the traffic keeping ramps to pass, and road-to-bridge construction of the closed main road section of the existing highway is carried out; in the construction stage after traffic guide and change, the main line traffic of the existing expressway is recovered, the temporary ramp section of the traffic protection ramp is dismantled, and the construction content of the remaining ramps is completed according to a design drawing. According to the technical scheme, the traffic protection ramp adopts a permanent and temporary combination mode, the newly-built ramp is fully utilized as the traffic protection ramp, the construction cost is saved, and the construction efficiency is improved. The normal operation of the existing expressway is ensured, and the construction safety during the traffic guide and change construction period and the traffic safety of vehicles on the existing expressway are also ensured.

Description

Technical Field

[0001] The invention relates to the technical field of highway construction, in particular to a traffic diversion method for hub interchange road construction. Background Art

[0002] With the development of social economy, the improvement of regional road network and the growth of traffic flow, more and more existing highways need to add interchanges to meet the needs of traffic flow, or new highways need to be connected with existing highways by interchanges. As a hub for high-grade highway traffic conversion, the interchange is carrying an increasing amount of traffic flow, and the traffic mode composition has also undergone major changes. The requirements for traffic organization in the construction area of ​​the hub interchange are also getting higher and higher. The construction area of ​​the hub interchange has different traffic characteristics from the normal roads, railways, etc., which often causes the redistribution of traffic flow in the construction area of ​​the hub interchange and produces a traffic flow bottleneck effect. The construction of the hub interchange must not only ensure the smooth progress of the construction, but also cope with the huge traffic pressure of the existing highway to ensure the normal passage of vehicles. The construction area is intertwined with the normal traffic flow, which is prone to traffic accidents, posing a threat to construction personnel and passing vehicles. It is difficult to coordinate, involving multiple departments and units. Poor coordination and communication may cause the construction to cause the traffic diversion plan to be blocked. In order to effectively solve the above problems, the present invention provides a traffic diversion method for the construction of a hub interchange involving roads. Summary of the invention

[0003] The technical problem to be solved by the present invention is to address the problems of large traffic flow, high safety risks and great coordination difficulty in the existing complex hub interchange construction.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for traffic diversion during construction of a hub interchange, comprising the following steps: Step 1: During the pre-construction phase of traffic diversion, construction access roads are built, gradient sections and widening bridges connecting to existing expressways are constructed, ramp roadbed and ramp bridge construction is carried out to ensure smooth access, and other ramp roadbed and ramp bridge construction of hub interchanges is carried out in between; Step 2: During the traffic diversion construction phase, after the construction of the gradient section and the ramp to maintain traffic on the existing expressway is completed, the main line section between the two diversion noses of the existing expressway is closed, and the two-way traffic vehicles of the existing expressway are diverted to the ramp to maintain traffic, completing the "road-to-bridge" construction of the main line of the existing expressway, and carrying out the road surface and traffic safety engineering construction; Step 3: During the post-traffic diversion construction phase, remove the existing highway traffic diversion signs, close the ramp entrances of the diverging and merging ramps, restore the existing highway mainline traffic, and complete the construction of the remaining ramp bridges, roadbed, pavement and traffic safety projects of the hub interchange.

[0005] Preferably, the hub interchange is a newly built interchange, and the hub interchange is a double T-shaped interchange.

[0006] Preferably, the widened bridge is a bridge that connects the widened existing expressway with an entrance ramp and an exit ramp.

[0007] Preferably, when constructing the gradient section and widening bridge of the existing expressway, the emergency lane of the existing expressway is closed, and the construction area is hard-isolated from the existing expressway by fencing.

[0008] Preferably, the maintenance ramp includes maintenance ramp 1B and maintenance ramp 2B, maintenance ramp 1B is a down road, maintenance ramp 2B is an up road, and the maintenance ramp adopts a combination of permanent and temporary, using a newly built temporary ramp to connect the original ramp.

[0009] Preferably, during the "road-to-bridge" construction process, the original partial roadbed section of the expressway is demolished, and the demolished section is converted into a bridge for the two newly built ramps to pass under the expressway.

[0010] Preferably, the step 1 comprises: S1.1. Use the existing provincial roads to pass under the section of the expressway to be constructed, and construct the substructure of the widening bridge of the expressway; S1.2. Carry out construction on the cutting of the ramp section to be constructed, and carry out construction of ramp bridge foundation piles and abutments; S1.3. Utilize and extend the local cement road and build access roads on both sides to create access conditions for other sections of the expressway to be built; S1.4. Use local roads to enter the site and immediately construct the culvert. At the same time, carry out the excavation of the road cut for the ramp section, the construction of the ramp bridge pile foundation, piers and cap beams, and the ramp roadbed filling; S1.5. Enter the construction site, construct the ramp bridge, fill the roadbed for the construction ramp, and excavate the cutting along the construction section; S1.6. Use local roads to access the site and construct the substructure of the main line widening bridge of the construction section; S1.7. Use local roads to access the site and construct the gradual section of the roadbed; S1.8. Go through the procedures for road construction and temporarily close the hard shoulder of the expressway to be constructed; S1.9, bridge construction using a bridge erection machine to install beams and slabs using the ramp to maintain access; S1.10, complete the road cutting excavation construction; S1.11. Complete the installation of road surface and traffic safety signs; S1.12. Complete the acceptance work of the ramp.

[0011] Preferably, the step 2 comprises: S2.1. Close the main line section between the two diverging noses of the expressway to be constructed, and use a ramp to provide bidirectional traffic; S2.2. Complete the excavation of the roadbed within the scope of the "road-to-bridge" project of the above-mentioned expressway; S2.3. Use a truck crane to arrange the beams and slabs, and enter the "road-to-bridge" area from under the ramp bridge for construction; S2.4. Complete the roadbed construction of the abutment sections on both sides of the “road-to-bridge” project; S2.5. Complete the main line pavement and traffic safety construction of the above-mentioned expressway; S2.6. Carry out corresponding construction acceptance.

[0012] Preferably, the step three comprises: S3.1. Open the main line traffic closure facilities between the two diverging noses of the expressway, remove the main line traffic diversion signs of the expressway, restore the main line traffic of the expressway, and close the ramp; S3.2. Complete the road milling of the ramp and dismantle the temporary ramp section of the ramp; S3.3. Complete the remaining bridge, roadbed, pavement and traffic safety construction of the ramp.

[0013] 1. The present invention provides a method for diverting traffic during construction of a hub interchange, wherein a ramp is first constructed, and after the ramp is completed, two-way traffic vehicles on the existing expressway are directed to the ramp to ensure normal operation of the existing expressway.

[0014] 2. The ramps for maintaining traffic safety adopt a combination of permanent and temporary construction, making full use of the newly built ramps and setting up temporary ramps for connection, thus reducing construction costs.

[0015] 3. When construction is being carried out on gradient sections, widened bridges and other road-related projects on existing highways, the emergency lanes of existing highways will be closed and the construction area will be hard-separated from the existing highway by fencing, thus ensuring construction safety and traffic safety of vehicles on the existing highway. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a general plan view of an embodiment of the present invention.

[0017] Figure 2 Schematic diagram of the construction procedure in the pre-construction stage of traffic diversion in an embodiment of the present invention.

[0018] Figure 3 It is a schematic diagram of the traffic diversion construction stage in an embodiment of the present invention.

[0019] Figure 4 It is a schematic diagram of the construction stage after traffic diversion in an embodiment of the present invention.

[0020] In the figure: 1. Hexiang Expressway; 2. Existing Shanghai-Chengdu Expressway; 3. Shanghai-Wuhan-Chengdu High-speed Railway; 4. Baotong Ramp 1B; 5. Baotong Ramp 2B; 6. New ramp number; 7. Shanghai-Chengdu Expressway bridge modification; 8. CK0+390 ramp bridge; 9. NK56+094 main line widening bridge; 10. CK0+200~311.5 section of cutting; 11. NK55+761 main line widening bridge; 12. CK0+646 culvert; 13. CK0+468.5~CK0+646 section of cutting; 14. CK 0+646~CK0+800 section of roadbed; 15, B1K0+800~B1K0+900 section of roadbed; 16, NK55+495.5 culvert; 17, BK1+924 culvert; 18, BK1+924~BK2+016.857 (merging nose NK55+587.215) section of roadbed; 19, NK55+587.215~NK55+693 section of roadbed; 20, BK1+924~BK1+800 (B2K0+560.167) section Roadbed; 21. B2K0+560.167~B2K0+200 (EK0+200) section cutting; 22. EK0+200~EK0+184.245 section cutting; 23. FK0+554 ramp bridge; 24. FK0+505.5~FK0+503.7 section roadbed; 25. B1K1+060~B1K0+900 section roadbed; 26. FK0+602.5~FK0+650 (NK54+904 bridge end) section cutting; 27. NK54+9 04 Main line widening bridge; 28. Gradual section roadbed of left section NK54+632.5~NK54+810.5; 29. ​​Gradual section roadbed of right section NK54+151.2-NK54+810.5; 30. Cutting section NK55+829.0-NK55+878.2; 31. Diversion nose; 32. Traffic closure facility; 33. Traffic vehicles; 34. A ramp; 35. B ramp; 36. C ramp; 37. D ramp; 38. E ramp; 39. F ramp; 40. Merge nose. DETAILED DESCRIPTION

[0021] In order to make the technical solution and implementation effect adopted by the present invention easy to understand, the present invention is further explained below with reference to specific illustrations.

[0022] The following embodiments are only used to illustrate the basic principles and main features of the present invention and the advantages of the invention. Those skilled in the art should understand that the present invention is not limited to the following embodiments.

[0023] Example: like Figure 1 to Figure 4 Shown is the traffic diversion method for the construction of the Mazongling Interchange at the Hexiang Expressway.

[0024] The Mazongling Hub Interchange of Hexiang Expressway 1 is located in the southwest of Gubei Town, Jinzhai County, Anhui Province. It crosses with the existing Shanghai-Chengdu Expressway 2 and is set up to realize the traffic conversion between this project and Shanghai-Chengdu Expressway 2. This project has a branch ramp that passes under the Shanghai-Wuhan-Chengdu High-speed Railway 3 and then passes under the Shanghai-Chengdu Expressway 2. Then, a roundabout ramp is used to overcome the height difference and connect to the Shanghai direction of Shanghai-Chengdu Expressway 2. Among them, the E and F ramps pass under the main line section of Shanghai-Chengdu Expressway 2, and the Shanghai-Chengdu Expressway needs to be designed as a "road-to-bridge" 7. In order to ensure that the vehicle traffic capacity of the Shanghai-Chengdu Expressway is not affected and the two-way four-lane traffic is still maintained, it is necessary to set up the guaranteed ramp 1B4 and guaranteed ramp 2B5.

[0025] The Mazongling Hub Interchange is a double T-shaped scheme with a total of six ramps, A, B, C, D, E, and F. The design speed of the direct and semi-direct ramps is 60km / h, the design speed of the inner ring ramp is 40km / h, the roadbed width of the one-way single-lane ramp is 10.5m, and the roadbed width of the one-way double-lane ramp is 10.5m.

[0026] The up and down ramps on the left and right sides of Shanghai-Chengdu Expressway 2 are B (up on the right), C (down on the left), E (down on the right), and F (up on the left). The designed ramps 1B4 and 2B5 are connected to Shanghai-Chengdu Expressway 2 using ramps B, C, E, and F.

[0027] In order to ensure that the vehicle traffic capacity of Shanghai-Chengdu Expressway 2 is not affected during the construction of Mazongling hub interchange, the present invention provides a hub interchange road construction traffic diversion method, first construct the maintenance ramps 1B4 and 2B5, then close the main line section between the two diversion noses 31 of Shanghai-Chengdu Expressway 2, guide the two-way traffic vehicles of Shanghai-Chengdu Expressway 2 to the maintenance ramps 1B4 and maintenance ramps 2B5, and carry out the "road-to-bridge" 7 construction of the closed main line section of Shanghai-Chengdu Expressway 2, finally restore the main line traffic of Shanghai-Chengdu Expressway 2, dismantle the temporary ramp sections of maintenance ramps 1B4 and maintenance ramps 2B5, and complete the construction content of the remaining ramps according to the design drawings. The technical solution of the present invention specifically includes three steps: S1: During the construction phase before traffic diversion, construction access roads are built, gradient sections and widening bridges connecting to existing expressways are constructed, ramp roadbed construction and ramp bridge construction are ensured, and other ramp roadbed construction and ramp bridge construction of hub interchanges are interspersed.

[0028] During the construction phase before traffic diversion, the following construction works will be carried out: Ⅰ. Use S331 Provincial Road to enter the site, pass through CK0+390 ramp bridge 8 to the NK56+094 main line widening bridge 9 on the left side of Shanghai-Chengdu Expressway 2, and carry out the substructure construction of NK55+940.5~NK56+247.5.

[0029] Ⅱ. Use Provincial Road S331 to enter the site, build a temporary road, excavate section 10 of cutting CK0+200~311.5, and carry out the pile foundation and abutment construction of platform 0 of ramp bridge 8 at CK0+390.

[0030] III. Utilize and extend the local cement road and build access roads on both sides to create access conditions for the construction of the lower structure of CK0+390 ramp bridge 8 and NK55+761 main line widening bridge 11 on the right side of Shanghai-Chengdu Expressway 2.

[0031] IV. Use local roads to enter the site and immediately construct the CK0+646 culvert 12. Simultaneously, excavate the C ramp section CK0+468.5~CK0+646 cutting 13 and construct the tail pier pile foundation and cap beam of the CK0+390 ramp bridge 8. Fill the C ramp section CK0+646~CK0+800 roadbed 14 and the B1K0+800~B1K0+900 roadbed 15. Utilizing this local road, enter the site through NK55+495.5 culvert 16 of Shanghai-Chengdu Expressway 2, and immediately construct BK1+924 culvert 17. At the same time, carry out construction of roadbed 18 of section BK1+924~BK2+016.857 (merge nose NK55+587.215) and roadbed 19 of section NK55+587.215~NK55+693 of B ramp with large mileage, fill roadbed 20 of section BK1+924~BK1+800 (B2K0+560.167) with small mileage, and excavate cutting 21 of section B2K0+560.167~B2K0+200 (EK0+200) and cutting 22 of EK0+200~EK0+184.245.

[0032] Ⅴ. Build a temporary road from County Road X055 to enter the site, construct FK0+505.5~FK0+602.5 of FK0+554 ramp bridge 23, and fill FK0+505.5~FK0+503.7 section roadbed 24 and B1K1+060~B1K0+900 section roadbed 25 in the direction of small mileage of F ramp, and excavate section cutting 26 of FK0+602.5~FK0+650 (NK54+904 bridge end) in the direction of large mileage of F ramp.

[0033] VI. Use local roads to enter the site and construct the lower structure of NK54+810~NK54+997 of the widening bridge 27 of the main line of Shanghai-Chengdu Expressway 2NK54+904.

[0034] Ⅶ. Use local roads to enter the site and construct the gradient section embankment 28 of the left section of Shanghai-Chengdu Expressway 2 from NK54+632.5 to NK54+810.5, and the gradient section embankment 29 of the right section from NK54+151.2 to NK54+810.5.

[0035] VIII. Handle the procedures for road construction and temporarily close the hard shoulder of Section 2 of the Shanghai-Chengdu Expressway.

[0036] Ⅸ. Complete the upper structure construction of NK54+904 main line widening bridge 27, NK55+761 main line widening bridge 11, and NK56+094 main line widening bridge 9. The installation of the beams and slabs of the left span of the NK54+904 main line widening bridge 27 and the NK56+094 main line widening bridge 9 uses a bridge-erecting machine, and the upper structure construction is carried out through the newly built access road and the S331 provincial road through the Baotong ramp B1 to the location; the installation of the beams and slabs of the NK55+761 main line widening bridge 11 and the right span of the NK54+904 main line widening bridge 27 uses a bridge-erecting machine, and the installation of the beams and slabs is carried out from the 5# beam yard (K146+180-K146+780 on the small pile side of Mazongling) → Heping Bridge → BK0+295 ramp bridge → BK0+874 ramp bridge → BK1+029 (construction on behalf of others) → BK1+254 ramp bridge → NK54+904 (right span) / NK55+761 (widening).

[0037] Ⅹ. Complete the excavation construction of section 30 of cutting NK55+829.0-NK55+878.2.

[0038] Ⅺ. Complete the installation of road surface and traffic safety signs.

[0039] Ⅻ. Complete the multi-party acceptance work for Ramp 1B4 and Ramp 2B5.

[0040] S2: Traffic diversion construction phase. After the construction of the gradient section and the maintenance ramp of the existing expressway is completed, the main line section between the two diversion noses 31 of the existing expressway is closed, and the two-way traffic vehicles of the existing expressway are diverted to the maintenance ramp to complete the "road-to-bridge" construction of the main line of the existing expressway, and the construction of the pavement and traffic safety engineering.

[0041] During the traffic diversion construction phase, the following construction works will be carried out: Ⅰ. Close the main line section between the two diversion noses 31 of Shanghai-Chengdu Expressway 2, and direct the two-way traffic vehicles 33 of Shanghai-Chengdu Expressway 2 to Baotong Ramp 1B4 and Baotong Ramp 2B5, with a speed limit of 60km / h.

[0042] Ⅱ. Complete the excavation of the roadbed in the NK55+290 main line "road to bridge" 7 area of ​​the Shanghai-Chengdu Expressway 2.

[0043] III. Complete the construction of the "road-to-bridge" 7 of the NK55+290 main line of the Shanghai-Chengdu Expressway 2, and enter the upper and lower structures from the CK0+390 ramp bridge 8. Use two 200T truck cranes to be deployed on the F ramp roadbed section to lift the beams and slabs, with the highest lifting distance of 7.1m; or from the 5# beam yard (K146+180-K146+780 on the small pile number side of Mazongling) → Heping Bridge → BK0+295 ramp bridge → BK1+874 ramp bridge → BK1+029 ramp bridge (construction on behalf of others) → CK1+383.5 ramp bridge (construction on behalf of others) → CK1+296 ramp bridge → underpass FKO+554 ramp bridge → NK54+290 (road-to-bridge) to carry out the "road-to-bridge" construction and use a bridge erection machine to erect beams and slabs.

[0044] IV. Complete the roadbed construction of the abutment sections on both sides of the NK55+290 main line "road to bridge" 7 of the Shanghai-Chengdu Expressway 2.

[0045] Ⅴ. Complete the pavement and traffic safety construction of the second main line of Shanghai-Chengdu Expressway.

[0046] VI. Completed the multi-party acceptance work for the second main line of the Shanghai-Chengdu Expressway.

[0047] S3: During the post-traffic diversion construction phase, the existing highway traffic diversion signs will be removed, the diversion ramp 31 and the merging ramp of the maintenance ramp will be closed, the main line traffic of the existing highway will be restored, and the construction of the remaining ramp bridges, roadbed, pavement and traffic safety projects of the hub interchange will be completed.

[0048] During the construction phase after traffic diversion, the following construction works will be carried out: Ⅰ. Open the main line traffic closure facility 32 between the two diversion noses 31 ends of Shanghai-Chengdu Expressway 2, remove the main line traffic diversion signs of Shanghai-Chengdu Expressway, restore the main line traffic of Shanghai-Chengdu Expressway 2, and close the diversion nose 31 of Ramp B 35, Ramp C 36, Ramp E 38, Ramp F 39, and the merging nose 40 ramp.

[0049] Ⅱ. Complete the milling of the ramp bridge pavement of Baotong Ramp 1B4 and Baotong Ramp 2B5, and dismantle the temporary ramp sections of Baotong Ramp 1B4 and Baotong Ramp 2B5.

[0050] III. Complete the remaining bridges, roadbed, pavement, and traffic safety construction of Ramp B 35, Ramp C 36, Ramp E 38, and Ramp F 39.

[0051] The advantages of the technical solution adopted by the present invention are: 1. The present invention provides a method for diverting traffic during construction of a hub interchange, which first constructs a ramp to divert bidirectional traffic vehicles on an existing highway to the ramp to ensure normal operation of the existing highway.

[0052] 2. The ramps for maintaining traffic safety adopt a combination of permanent and temporary construction, making full use of the newly built ramps and setting up temporary ramps for connection, thus reducing construction costs.

[0053] 3. When construction is being carried out on gradient sections, widened bridges and other road-related projects on existing highways, the emergency lanes of existing highways will be closed and the construction area will be hard-separated from the existing highway by fencing, thus ensuring construction safety and traffic safety of vehicles on the existing highway.

[0054] The above embodiments show and describe the basic principles, main features and technical advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and the specification describe the principles of the present invention. Without departing from the essence and scope of the present invention, the present invention may also have various optimizations and improvements, and these optimizations and improvements are required to be within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for traffic diversion during construction of a hub interchange, characterized in that: The steps include: Step 1: During the pre-construction phase of traffic diversion, construction access roads are built, gradient sections and widening bridges connecting to existing expressways are constructed, ramp roadbed and ramp bridge construction is carried out to ensure smooth access, and other ramp roadbed and ramp bridge construction of hub interchanges is carried out in between; Step 2: During the traffic diversion construction phase, after the construction of the gradient section and the ramp to maintain traffic on the existing expressway is completed, the main line section between the two diversion noses of the existing expressway is closed, and the two-way traffic vehicles of the existing expressway are diverted to the ramp to maintain traffic, completing the "road-to-bridge" construction of the main line of the existing expressway, and carrying out the road surface and traffic safety engineering construction; Step 3: During the post-traffic diversion construction phase, remove the existing highway traffic diversion signs, close the ramp entrances of the diverging and merging ramps, restore the existing highway mainline traffic, and complete the construction of the remaining ramp bridges, roadbed, pavement and traffic safety projects of the hub interchange.

2. A method for redirecting traffic during construction of a hub interchange as claimed in claim 1, characterized in that: The hub interchange is a newly built interchange, and the hub interchange is a double T-shaped interchange.

3. A method for redirecting traffic during construction of a hub interchange as claimed in claim 1, characterized in that: The widening bridge is a bridge that connects the widened existing expressway with an entrance ramp and an exit ramp.

4. A method for redirecting traffic during construction of a hub interchange as claimed in claim 1, characterized in that: When constructing gradient sections and widening bridges on existing highways, the emergency lanes of existing highways will be closed and the construction area will be hard-separated from the existing highway by fencing.

5. The method for traffic diversion during construction of a hub interchange as claimed in claim 1, characterized in that: The maintenance ramp includes a maintenance ramp 1B (4) and a maintenance ramp 2B (5). The maintenance ramp 1B (4) is a downhill road, and the maintenance ramp 2B (5) is an uphill road. The maintenance ramp adopts a combination of permanent and temporary ramps, using a newly built temporary ramp to connect the original ramp.

6. A method for redirecting traffic during construction of a hub interchange as claimed in claim 1, characterized in that: During the construction process of the "road-to-bridge" project, the original partial roadbed section of the existing expressway is demolished and the demolished section is converted into a bridge for the two newly built ramps to pass under the expressway.

7. A method for redirecting traffic during construction of a hub interchange as claimed in claim 1, characterized in that: The step one comprises: S1.

1. Use the existing provincial roads to pass under the section of the expressway to be constructed, and construct the substructure of the widening bridge of the expressway; S1.

2. Carry out construction on the cutting of the ramp section to be constructed, and carry out construction of ramp bridge foundation piles and abutments; S1.

3. Utilize and extend the local cement road and build access roads on both sides to create access conditions for other sections of the expressway to be built; S1.

4. Use local roads to enter the site and immediately construct the culvert, while excavating the ramp section, constructing the ramp bridge pile foundation, piers and cap beams, and filling the ramp roadbed; S1.

5. Enter the construction site, construct the ramp bridge, fill the roadbed for the construction ramp, and excavate the cutting along the construction section; S1.

6. Use local roads to access the site and construct the substructure of the main line widening bridge of the construction section; S1.

7. Use local roads to access the site and construct the gradual section of the roadbed; S1.

8. Go through the procedures for road construction and temporarily close the hard shoulder of the expressway to be constructed; S1.9, bridge construction using a bridge erection machine to install beams and slabs using the ramp to maintain access; S1.10, complete the road cutting excavation construction; S1.

11. Complete the installation of road surface and traffic safety signs; S1.

12. Complete the acceptance work of the ramp.

8. A method for redirecting traffic during construction of a hub interchange as claimed in claim 1, characterized in that: The second step comprises: S2.1, closing the main line section between the two diverging noses (31) of the expressway to be constructed, and using a ramp for bidirectional traffic vehicles (33); S2.

2. Complete the excavation of the roadbed within the scope of the "road-to-bridge" project of the above-mentioned expressway; S2.

3. Use a truck crane to arrange the beams and slabs, and enter the "road-to-bridge" area from under the ramp bridge for construction; S2.

4. Complete the roadbed construction of the abutment sections on both sides of the "road-to-bridge" project; S2.

5. Complete the main line pavement and traffic safety construction of the above-mentioned expressway; S2.

6. Carry out corresponding construction acceptance.

9. A method for redirecting traffic during construction of a hub interchange as claimed in claim 1, characterized in that: The step three comprises: S3.

1. Open the main line traffic closure facility (32) between the two diversion noses (31) of the expressway, remove the main line traffic diversion sign of the expressway, restore the main line traffic of the expressway, and close the ramp; S3.

2. Complete the road milling of the ramp and dismantle the temporary ramp section of the ramp; S3.

3. Complete the remaining bridge, roadbed, pavement and traffic safety construction of the ramp.

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