CN-121976463-A - Concrete jacking method for steel pipe arch bridge

CN121976463ACN 121976463 ACN121976463 ACN 121976463ACN-121976463-A

Abstract

The invention discloses a concrete jacking method of a steel pipe arch bridge, which comprises the following steps of (1) respectively arranging a primary slurry inlet at two ends of arch feet of left and right arch rib chords, respectively arranging a secondary slurry inlet at 2/5-3/5 of each arch rib chord, arranging a slurry outlet at the arch crown, (2) starting a primary pump and vacuum auxiliary equipment, pumping the primary concrete to be close to the secondary slurry inlet, (3) pumping the secondary concrete by the secondary pump, slowing down pumping speed when the section of the secondary concrete exceeds the height of the secondary slurry inlet by 2.5-5m, closing an exhaust hole, and starting the vacuum auxiliary equipment until the secondary concrete is close to the slurry outlet. The invention ensures the smooth concrete pouring construction of the steel tube arch bridge by a graded pouring method.

Inventors

DING MINGHAI
Liu Caoping
ZHANG HAO
WANG KAILIANG
Gao Zhuolian
FANG XIN
LIANG YAO

Assignees

中铁上海工程局集团有限公司
中铁上海工程局集团第五工程有限公司

Dates

Publication Date: 20260505
Application Date: 20251230

Claims (10)

1. The concrete jacking method of the steel pipe arch bridge is characterized by comprising the following steps of: (1) The two ends of each arch rib chord member are respectively provided with a primary pulp inlet, each arch foot of each arch rib chord member is respectively provided with a secondary pulp inlet, each arch crown is provided with a pulp outlet, and the position of each arch rib chord member close to the pulp outlet is provided with an exhaust hole; (2) Starting a primary pump and vacuum auxiliary equipment, carrying out primary concrete pumping, closing the vacuum auxiliary equipment when primary concrete approaches a secondary slurry inlet, opening an exhaust hole, and stopping conveying the primary concrete by the primary slurry inlet; (3) And (3) starting the secondary pump in advance during the primary concrete pumping period, wetting the secondary pump, connecting the secondary pump with the secondary slurry inlet through the secondary pump when the primary concrete approaches the secondary slurry inlet, pumping the secondary concrete, slowing down the pumping speed when the section of the secondary concrete exceeds the height of the secondary slurry inlet by 2.5-5m, closing the exhaust hole, starting the vacuum auxiliary equipment, recovering the normal pumping speed after the pressure in the pipe reaches-0.06 Mpa to-0.08 Mpa until the secondary concrete approaches the slurry outlet, closing the vacuum auxiliary equipment, opening the exhaust hole, stopping the conveying of the secondary concrete when the secondary concrete is discharged out of the slurry outlet.
2. The concrete jacking method of the steel tube arch bridge according to claim 1, wherein: The inlet of the primary pulp inlet is provided with a primary valve, the inlet of the secondary pulp inlet is provided with a secondary valve, and the exhaust pipe is provided with an exhaust pipe valve.
3. The concrete jacking method of the steel tube arch bridge according to claim 2, wherein: A first pressure sensor is arranged at the position, close to the secondary pulp inlet, of the inner wall of the arch rib chord member, a second pressure sensor is arranged at the position, 2.5-5m higher than the secondary pulp inlet, of the inner wall of the arch rib chord member, and a third pressure sensor is arranged at the position, close to the pulp outlet, of the inner wall of the arch rib chord member; The first pressure sensor, the second pressure sensor, the third pressure sensor, the primary valve, the secondary valve, the exhaust pipe valve, the primary pump, the secondary pump and the vacuum auxiliary equipment are all connected with a jacking control system; The control method of the jacking control system comprises the following steps: The jacking control system controls the first-stage pump and the vacuum auxiliary equipment to start, carries out first-stage concrete pumping, and closes the vacuum auxiliary equipment, opens an exhaust pipe valve, closes the first-stage valve and closes the first-stage pump when the jacking control system receives that the first pressure sensor reaches a threshold value; And (3) starting the secondary pump, connecting the secondary pump with the secondary slurry inlet through a secondary pump pipe, controlling the lifting control system to start the secondary valve, controlling the secondary pump to slow down the pumping speed when the lifting control system receives the second pressure sensor to reach the threshold value, closing the exhaust pipe valve, starting the vacuum auxiliary equipment, closing the vacuum auxiliary equipment when the lifting control system receives the third pressure sensor to reach the threshold value, opening the exhaust pipe valve, waiting for the secondary concrete to overflow the slurry outlet, closing the secondary valve, and closing the secondary pump.
4. The concrete jacking method of the steel tube arch bridge according to claim 2, wherein: in step (3), the pumping speed is slowed down, specifically, the pumping speed is reduced by 10-20%.
5. The concrete jacking method of the steel tube arch bridge according to claim 1, wherein: In the step (2), the position close to the secondary pulp inlet is 20-30cm lower than the height of the secondary pulp inlet.
6. The concrete jacking method of the steel tube arch bridge according to claim 1, wherein: in the step (3), the position close to the pulp outlet is 15 cm to 25cm lower than the pulp outlet height.
7. The concrete jacking method of the steel tube arch bridge according to claim 1, wherein: The utility model discloses a vacuum pump, including the thick liquid mouth department, the thick liquid mouth department is connected with the thick liquid mouth adapter, the thick liquid mouth adapter is including adapter body, adapter outlet pipe, adapter first ring flange and adapter second ring flange, adapter body bottom is provided with adapter first ring flange, can be connected with the thick liquid mouth ring flange that sets up in the thick liquid mouth department, adapter body one side or top with the one end intercommunication of adapter outlet pipe, the other end and the adapter second ring flange of adapter outlet pipe, adapter second ring flange is connected with the quick detach ring flange, and the quick detach ring flange outer end is provided with the interface, the interface is used for switching and inserts vacuum auxiliary equipment's suction tube or row material pipe.
8. The concrete jacking method of the steel tube arch bridge according to claim 1, wherein: the mixing amount of the water reducer in the primary concrete is 5-20% more than that of the water reducer in the primary concrete.
9. The concrete jacking method of the steel tube arch bridge of claim 8, wherein: the primary concrete consists of, by weight, 330-350 parts of cement, 140-155 parts of water, 135-148 parts of fly ash, 37-42 parts of silica fume, 42-50 parts of an expanding agent, 650-680 parts of sand, 315-335 parts of 5-10mm broken stone, 750-770 parts of 10-15mm broken stone, 25-40 parts of microbeads and 13-19 parts of a water reducer; The secondary concrete comprises, by weight, 330-350 parts of cement, 140-155 parts of water, 135-148 parts of fly ash, 37-42 parts of silica fume, 42-50 parts of an expanding agent, 650-680 parts of sand, 315-335 parts of 5-10mm broken stone, 750-770 parts of 10-15mm broken stone, 25-40 parts of microbeads and 10.5-15 parts of a water reducer.
10. The concrete jacking method of the steel tube arch bridge according to claim 1, wherein: and three-stage slurry inlets are respectively formed in the arch rib chords 2/3-4/5, and if the slurry is difficult to pump from the two-stage slurry inlets to the slurry outlet, the three-stage slurry inlets are started to pump concrete.

Description

Concrete jacking method for steel pipe arch bridge Technical Field The invention relates to the technical field of bridge construction, in particular to a concrete jacking method of a steel tube arch bridge. Background The steel pipe concrete arch bridge is formed by filling concrete into a steel pipe arch rib, the steel pipe provides closing stability of the steel pipe by means of the action of the internally filled concrete, and the bearing capacity of the concrete is improved by means of the hoop action of the steel pipe, so that the bearing capacity is greatly enhanced by combining the steel pipe and the concrete, and the steel pipe concrete arch bridge has the advantages of light dead weight, rapid construction and the like, and is widely popularized and applied in the bridge field. In order to better improve the bearing capacity of the steel pipe concrete arch bridge, part of the steel pipe concrete arch bridge starts to be poured into the arch rib chord members by adopting C70 concrete, and the C70 concrete has the characteristics of high strength and self-compaction, but due to the characteristics of high strength, the problem of pipe blockage and even pipe explosion caused by overlarge pumping pressure in the jacking process can occur, so that the problem of ensuring that the C70 concrete can be smoothly poured into the steel pipe arch ribs becomes a key for improving the quality of the steel pipe concrete arch bridge. Disclosure of Invention The invention discloses a concrete jacking method of a steel tube arch bridge, which ensures smooth concrete grouting construction of the steel tube arch bridge by a graded grouting method. In order to achieve the above purpose, the technical scheme of the invention is as follows: A concrete jacking method of a steel pipe arch bridge comprises the following steps: (1) The two ends of each arch rib chord member are respectively provided with a primary pulp inlet, each arch foot of each arch rib chord member is respectively provided with a secondary pulp inlet, each arch crown is provided with a pulp outlet, and the position of each arch rib chord member close to the pulp outlet is provided with an exhaust hole; (2) Starting a primary pump and vacuum auxiliary equipment, carrying out primary concrete pumping, closing the vacuum auxiliary equipment when primary concrete approaches a secondary slurry inlet, opening an exhaust hole, and stopping conveying the primary concrete by the primary slurry inlet; (3) And (3) starting the secondary pump in advance during the primary concrete pumping period, wetting the secondary pump, connecting the secondary pump with the secondary slurry inlet through the secondary pump when the primary concrete approaches the secondary slurry inlet, pumping the secondary concrete, slowing down the pumping speed when the section of the secondary concrete exceeds the height of the secondary slurry inlet by 2.5-5m, closing the exhaust hole, starting the vacuum auxiliary equipment, recovering the normal pumping speed after the pressure in the pipe reaches-0.06 Mpa to-0.08 Mpa until the secondary concrete approaches the slurry outlet, closing the vacuum auxiliary equipment, opening the exhaust hole, stopping the conveying of the secondary concrete when the secondary concrete is discharged out of the slurry outlet. Further, a primary valve is arranged at the inlet of the primary pulp inlet, a secondary valve is arranged at the inlet of the secondary pulp inlet, and an exhaust pipe valve is arranged on the exhaust pipe. Further, a first pressure sensor is arranged at the position, close to the secondary pulp inlet, of the inner wall of the arch rib chord member, a second pressure sensor is arranged at the position, 2.5-5m higher than the secondary pulp inlet, of the inner wall of the arch rib chord member, and a third pressure sensor is arranged at the position, close to the pulp outlet, of the inner wall of the arch rib chord member; The first pressure sensor, the second pressure sensor, the third pressure sensor, the primary valve, the secondary valve, the exhaust pipe valve, the primary pump, the secondary pump and the vacuum auxiliary equipment are all connected with a jacking control system; The control method of the jacking control system comprises the following steps: The jacking control system controls the first-stage pump and the vacuum auxiliary equipment to start, carries out first-stage concrete pumping, and closes the vacuum auxiliary equipment, opens an exhaust pipe valve, closes the first-stage valve and closes the first-stage pump when the jacking control system receives that the first pressure sensor reaches a threshold value; And (3) starting the secondary pump, connecting the secondary pump with the secondary slurry inlet through a secondary pump pipe, controlling the lifting control system to start the secondary valve, controlling the secondary pump to slow down the pumping speed when the lifting control system receives the s