CN116695577A - Method for pouring concrete into arch rib of upper bearing type steel pipe concrete arch bridge - Google Patents
Method for pouring concrete into arch rib of upper bearing type steel pipe concrete arch bridge Download PDFInfo
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- CN116695577A CN116695577A CN202310743231.0A CN202310743231A CN116695577A CN 116695577 A CN116695577 A CN 116695577A CN 202310743231 A CN202310743231 A CN 202310743231A CN 116695577 A CN116695577 A CN 116695577A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 113
- 239000010959 steel Substances 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010276 construction Methods 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 230000000903 blocking effect Effects 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims description 95
- 239000002002 slurry Substances 0.000 claims description 64
- 238000001514 detection method Methods 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 19
- 238000012360 testing method Methods 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 14
- 239000004570 mortar (masonry) Substances 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000000007 visual effect Effects 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 230000010412 perfusion Effects 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 6
- 238000001931 thermography Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 239000011083 cement mortar Substances 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 11
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 3
- 238000009435 building construction Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H15/00—Tents or canopies, in general
- E04H15/02—Tents combined or specially associated with other devices
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H15/00—Tents or canopies, in general
- E04H15/32—Parts, components, construction details, accessories, interior equipment, specially adapted for tents, e.g. guy-line equipment, skirts, thresholds
- E04H15/34—Supporting means, e.g. frames
- E04H15/44—Supporting means, e.g. frames collapsible, e.g. breakdown type
- E04H15/48—Supporting means, e.g. frames collapsible, e.g. breakdown type foldable, i.e. having pivoted or hinged means
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H15/00—Tents or canopies, in general
- E04H15/32—Parts, components, construction details, accessories, interior equipment, specially adapted for tents, e.g. guy-line equipment, skirts, thresholds
- E04H15/58—Closures; Awnings; Sunshades
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/24—Reminder alarms, e.g. anti-loss alarms
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/08—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using communication transmission lines
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention belongs to the technical field of building construction, in particular to a concrete pouring construction method in an arch rib of an upper bearing type steel pipe concrete arch bridge, which comprises the following steps: step one, construction preparation: a. selecting a concrete proportion; b. selecting and configuring a pump truck; c. and (3) arranging a pump pipe. According to the method for pouring concrete in the arch rib of the upper-bearing type steel pipe concrete arch bridge, the automatic rain shielding mechanism is arranged on the surface of the pump truck, so that the sunshade canvas is automatically controlled to be opened and unfolded in use in rainy days, the feeding end of the pump truck is shielded from rain, rainwater is prevented from entering the interior of the concrete, the quality of concrete pouring is enhanced, the defect of forming bubbles caused by water inflow is prevented, the quality of products is enhanced, the visualized anti-blocking alarm mechanism is further arranged for monitoring the conveying blocking state of the pump pipe in real time, the blocking of the part can be clearly known, rapid maintenance processing can be rapidly and accurately found, and the construction efficiency is enhanced.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a concrete pouring construction method in an arch rib of an upper bearing type steel tube concrete arch bridge.
Background
The arch bridge is divided according to main arch ring materials, mainly comprises a stone arch bridge, a concrete arch bridge, a steel pipe concrete arch bridge and the like, wherein the stone arch bridge is only suitable for a bridge with a medium span and a small span due to the fact that the self weight of the stone arch bridge is heavy, the concrete arch bridge needs a large amount of construction equipment and temporary supports due to the self weight of the main arch ring, the steel arch bridge needs to consume a large amount of steel for reinforcing the structure to be stable, vibration is needed in pouring to improve compactness, and after the inside of the concrete arch bridge is blocked in pipeline conveying, the concrete position blocking is not known to cause maintenance and detection difficulty, monitoring and knowing cannot be implemented, and the conveying and pouring efficiency is influenced, so that the construction method for pouring concrete in the arch rib of the over-the steel pipe concrete arch bridge is needed.
Disclosure of Invention
Based on the prior art, the invention provides a concrete pouring construction method in an arch rib of an upper bearing type steel pipe concrete arch bridge.
The invention provides a concrete pouring construction method in an arch rib of an upper bearing type steel tube concrete arch bridge, which comprises the following steps: step one, construction preparation: a. the concrete proportion is selected, the slump is controlled to be 22 cm-27 cm when the concrete is pumped, the expansion is controlled to be 60-70 cm, the T500 time is controlled to be 5-20 s, and the slump passing time is controlled to be 6-10 s; b. selecting and configuring a pump truck; c. the arrangement of the pump pipe is that a visual anti-blocking alarm mechanism is arranged on the arc surface of the pump pipe, so that the action of blocking alarm caused by expansion of the pump pipe is monitored in the process of pump pipe pouring; d. selecting a process test; e. a perfusion sequencing arrangement; f. setting a perfusion node;
step two, primary pumping construction: a. testing water of a pump pipe and cleaning the pipe wall; b. the first stage pump is installed and prepared, and a single engine is used for pumping at low pressure in the first stage when the pump truck pumps; c. pumping the concrete in the primary pipe;
step three, secondary pumping construction: a. a primary pump and a secondary pump carry switching operation; b. the concrete in the pumping diode is operated, the pumping of the second stage adopts high-pressure pumping, two engines are used, and when the rainy weather is met, the automatic rain shielding mechanism arranged on one side of the pumping truck works to shield the rain;
and step four, dismantling a pump pipe after the pumping construction is finished: and (5) performing compactness detection.
Preferably, in the step one, the calculation formula of the internal pressure loss of the horizontal conveying pipe in the working pump of the conveying pump is as follows:
r-pumping tube radius;
K 1 adhesion coefficient (Pa), K 1 ＝(3.0-0.01S)×10 2 ；
K 2 -velocity coefficient (Pa/m/s), K 2 ＝(4.0-0.01S)×10 2 ；
T-concrete slump, in cm;
t 2 /t 1 -the ratio of the switching time of the distribution valve to the pushing of the piston against the concrete;
V 0 -average speed of the concrete mix in the delivery pipe, in m/s;
a 0 -the ratio of the radial pressure to the axial pressure of the concrete;
ΔPh-pressure loss due to the flow of concrete in the horizontal transfer pipe;
total pressure loss due to Q-concrete flow;
l-pump tube horizontal conversion length;
P f the loss caused by the shearing nails, the flange plates and the pipe wall of the main chord pipe and the pressure loss of the flange plates and the shearing nails sections obtained through process tests are 1.948Kpa/m, and the on-way resistance loss in the steel pipe is 0.511Kpa/m;
calculated according to 40% displacement of the pump truck, the maximum pressure is 16.02MPa, and the actual displacement on site is 45m 3 And (3) h, setting 4 pump trucks in total in the full bridge, wherein the maximum pressure is 16-17MPa, and the total bridge is consistent with the calculated data, and the 2 pump trucks are used for first-stage concrete pouring; and the other 2 pump trucks are used for secondary concrete pouring.
Preferably, the automatic rain shielding mechanism in the third step comprises a pump truck body, wherein a driving pipe is fixedly arranged on one side circular arc surface of the pump truck body, a driving sliding groove is formed in an annular array on the circular arc surface of the driving pipe, a driving motor is fixedly arranged on the inner bottom wall of the driving pipe, a threaded rod is fixedly arranged on an output shaft of the driving motor through a coupler, the top of the threaded rod is rotationally connected with the inner top wall of the driving pipe through a bearing, a driving block is in threaded connection with the threaded surface of the threaded rod, a first hinging seat is arranged on the annular array on the surface of the driving block, a first connecting rod is hinged at one end of the first hinging seat through a pin shaft, a second connecting rod is hinged at one end of the first connecting rod through a pin shaft, a second hinging seat is hinged at one end of the second connecting rod through a pin shaft, the surfaces of the three second hinging seats are fixedly arranged on the circular arc surfaces of the top of the driving pipe, and rain shielding layers of the three second connecting rods are respectively arranged on the surfaces of the second canvas;
in step one visual anti-blocking alarm mechanism includes the floor, the steel buried plate is installed through high strength bolt on the surface of floor, the backup pad is all installed through high strength bolt to the top opposite surface of steel buried plate, the top fixed mounting of backup pad has a lower arc clamp plate, the surface of lower arc clamp plate is installed through high strength bolt and is gone up the arc clamp plate, go up the inner wall of arc clamp plate with the inner wall of lower arc clamp plate all bonds there is arc conducting strip, and a plurality of the equal fixed mounting of arc conducting strip's circular arc inner wall has insulating rubber, a plurality of insulating rubber's inner wall all extrudees with the circular arc surface of pump line, a plurality of insulating rubber's interval opposite surface between all is provided with the conducting block, a plurality of the surface of conducting block bonds with the circular arc surface of pump line, a plurality of conducting block and a plurality of arc conducting strip form the difference in height in the installation, one of arc conducting strip's one end extends to one side of going up the arc clamp plate, one side fixed mounting of going up the arc clamp plate has the alarm, the alarm with relative arc conducting strip electric connection.
Preferably, in the first step, the pump pipe is arranged on the overhaul channel beside the inner chord pipe; the single 4 chord pipes share 1 set of pump pipe, and the standby pump pipe is arranged from a primary grouting port to a secondary grouting port along an overhaul channel; when the lower chord pipe is poured, a temporary construction platform is erected at the position connected with the lower chord pipe, the pump pipe is arranged on the construction platform, and the pump pipe is turned to the lower chord pipe through an upper chord pipe connecting elbow; the left and right pump pipes are arranged at the inner side of the upper chord pipe, and the outer pump pipe is arranged by the inner pump pipe through a 45-degree elbow;
the pump pipe 6m is provided with a U-shaped clamp, the U-shaped clamp is connected with an overhaul channel, the pump pipe is fixed on the overhaul channel, square timber is added at the position of a reinforcing steel bar, a rubber pad is arranged at the contact position of a top steel plate and the pump pipe, and a hand hoist is arranged at the positions of an elbow and each arch rib section;
when the outside air temperature is higher than 30 ℃ or the temperature of the outer wall of the main pipe is higher than 35 ℃, spray cooling measures are taken for the concrete transport vehicle, the conveying pipe, the slurry inlet pipe and the arch rib steel pipes.
Preferably, in the first step, the second stage main arch steel pipe is selected as a simulation object of a process test; converting the curve lengths of the pump pipes on the steel pipes of the first stage and the second stage into horizontal pump pipes under the same pumping pressure, and simulating the actually required pumping pressure through the detour arrangement of the pump pipes; the steel pipe with the same diameter as the main arch is obliquely placed at a test site to simulate the main arch steel pipe; the steel pipes are obliquely arranged at an angle of 45 degrees and 0 degrees and are divided into 2 groups, wherein the angle of 45 degrees is tested 3 times and the angle of 0 degree is tested 1 time.
And determining concrete performance parameters, calculating on-way resistance (pump pipe, steel pipe, flange plate and shear pin), distributing rule of temperature field of the section of the concrete in the pipe and detecting the liquid level capacity of the concrete by infrared thermal imaging through experiments.
Preferably, 16 steel pipes are arranged in the full bridge in the first step, the symmetrical pouring is performed for 16 times, 1 steel pipe is poured in a single way, and the symmetrical pouring is performed for two spans alternately; the single span arch rib pouring principle is that the pouring is firstly performed downwards, then performed upwards, and then performed inwards and outwards.
Preferably, in the first step, the grouting hole joint is welded on the side surface of a chord tube of the arch rib, the tube head extending into the chord tube faces the advancing direction, the length of the tube head extends into 40cm, and the grouting holes of the upper chord tube and the lower chord tube are arranged on the same section vertical to the arch rib; each grouting hole is provided with a stop valve, 4 stiffening plates are connected between the joint and the steel pipe wall, the thickness of each stiffening plate is 10mm, and the length of each stiffening plate is 15cm; the steel pipe opening welding at the grouting hole is completed by a professional welder, and flaw detection is performed;
the slurry outlet holes are steel pipes with diameter of 125mm and are respectively arranged at two sides of the compartment plate, the height is 200cm, and the top of the slurry outlet pipe is provided with an elbow; the vault position sets up two exhaust holes, through ball valve control.
Preferably, in the second step, a water test is carried out on the pump pipe before each concrete pouring, the pump truck is connected with the pump pipe, the stop valve is opened, the pump truck is started to pump water into the pump pipe, the water leakage state of the pump pipe is checked, the pump pipe is observed to be fixed in the pumping process, and the swaying part is required to be reinforced again; the bottom of the steel pipe is provided with a slag discharging hole, and water pumped into the pump pipe is directly discharged into the steel pipe and discharged through the slag discharging hole;
connecting a pump pipe with a valve, pumping 1m 3 water and 1.5m 3 cement mortar with the same label by a pump machine, fully lubricating the wall of the pump pipe, and directly discharging the mortar into a main chord pipe; after the mortar is pumped, preparing a primary pumping;
the concrete is transported to the site, the concrete is fully cured for more than or equal to 0.5 hour, large bubbles are removed, performance detection is carried out on each car of concrete, each car of concrete meets the pouring requirement, and the unqualified concrete is transported to a mixing station for treatment;
starting a pump machine to pump the concrete in the primary pipe; when the pumping starts, low-speed pressure delivery is adopted, the pressure of the pump and the working condition of each part are observed, and the normal pressure delivery speed is increased after the pressure is smooth; calculating the required square quantity from a pumping port through infrared thermal imaging, realizing filling of concrete below the pumping port by a pump truck and in a pump pipe, pumping at a low speed, closing a slurry outlet hole after the concrete slurry is discharged, and tracking the interface height of the concrete in the pumping process; when the surface of the concrete in the pipe is 50cm below the position of the secondary slurry inlet, the pumping displacement is reduced, and the primary pump is pumped slowly.
Preferably, in the third step, the slurry pumped at the first stage is discharged through a horizontal slurry outlet pipe, the slurry discharging sequence is turbid water-mortar-concrete, after the concrete is discharged, a slurry inlet pipe and a slurry outlet pipe stop valve are closed, a main pipe and a first stage slurry injection port are disconnected, a pump and a first stage pump pipe are cleaned in time, the second stage concrete is pumped at the same time, and 1m of slurry is pumped before pumping 3 After water is pumped, 1m 3 mortar is pumped, so that the string pipe is ensured to be wet in the pumping process, and the friction resistance of the pipe wall is reduced;
concrete pumping in the diode is carried out until the vault, the vault and the slurry outlet pipe are out of slurry, the pump continues pumping concrete until the vault, the slurry outlet pipe and the slurry outlet are out of homogeneous mortar, pumping of concrete is suspended, standing is carried out for 5 minutes, the vent hole is opened, pumping is continued after the exhaust is completed, standing is carried out for 5 minutes again, standing is repeated for 3 times, pumping is stopped after the pumping is carried out and the homogeneous concrete is discharged, and the slurry inlet pipe stop valve is closed, so that pumping pouring of single main chord pipe concrete is completed.
Preferably, after the concrete filled steel tube is poured for 28 days, the compactness of the concrete filled steel tube is detected, and a method of combining manual knocking and ultrasonic detection is adopted, wherein a plurality of equidistant points are selected along the periphery of the steel tube for manual knocking detection, and the detection is carried out from the arch feet to the arch crown; when the manual knocking inspection result is abnormal, the detection density is increased, the ultrasonic detection range is determined, and when the ultrasonic detection finds the abnormality, the drilling reinspection is carried out.
The beneficial effects of the invention are as follows:
1. according to the invention, the automatic rain shielding mechanism is arranged on the surface of the pump truck, so that the sunshade canvas is automatically controlled to be opened and unfolded in use in rainy days, the feeding end of the pump truck is driven to shield rain, rainwater is prevented from entering the interior of concrete, so that the quality of concrete pouring is enhanced, the defect of forming bubbles caused by water inflow is prevented, the quality of products is enhanced, and the visualized anti-blocking alarm mechanism is also arranged for monitoring the conveying blocking state of the pump pipe in real time, so that the blocking of the part can be clearly known, the rapid maintenance and treatment can be quickly and accurately found, and the construction efficiency is enhanced.
2. The invention also achieves the purpose that the steel pipe is used as the upper structure of the arch rib, and can effectively bear the load of the bridge. After the concrete is poured, an integrated structure is formed, and the integral rigidity and strength are increased. Shock resistance: the combined structure of the steel pipe and the concrete is excellent in the anti-seismic performance. The steel pipe can absorb and disperse seismic forces, and the concrete can provide stable support and protect the steel pipe. The concrete pouring can effectively protect the steel pipe from being corroded and damaged by the external environment, and the service life of the bridge is prolonged. The construction method of concrete pouring in the arch rib of the upper bearing type steel pipe concrete arch bridge can realize rapid engineering progress. The template is simple to install, the poured concrete is relatively fast, and the construction time is saved. Because the integrated structure is formed after the concrete is poured, the maintenance is more convenient. When maintenance is required, local repair or replacement can be performed more easily.
Drawings
FIG. 1 is a schematic diagram of a construction method for pouring concrete into arch ribs of an upper-bearing type steel pipe concrete arch bridge;
FIG. 2 is a perspective view of a rain shielding canvas structure of an upper bearing type steel pipe concrete arch bridge arch rib inner concrete pouring construction method;
FIG. 3 is a perspective view of an automatic rain shielding mechanism of an upper bearing type steel pipe concrete arch bridge arch rib inner concrete pouring construction method;
FIG. 4 is a perspective view of a driving block structure of a method for pouring concrete in the arch rib of an upper bearing type steel pipe concrete arch bridge;
FIG. 5 is a perspective view of a visual anti-blocking alarm mechanism for a construction method of concrete pouring in the arch rib of an upper bearing type steel pipe concrete arch bridge;
fig. 6 is a perspective view of an arc-shaped conductive sheet structure of an upper bearing type steel pipe concrete arch bridge arch rib inner concrete pouring construction method.
In the figure: 1. a pump tube; 2. visual anti-blocking alarm mechanism; 21. a floor slab; 22. a steel buried plate; 23. a support plate; 24. a lower arc-shaped pressing plate; 25. an upper arc-shaped pressing plate; 26. arc-shaped conductive sheets; 27. an insulating rubber; 28. a conductive block; 29. an alarm; 3. an automatic rain shielding mechanism; 31. a pump truck body; 32. a driving tube; 33. driving the chute; 34. a driving motor; 35. a threaded rod; 36. a driving block; 37. a first hinge base; 38. a first link; 39. a second link; 310. the second hinge seat; 311. rain shielding canvas.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1 to 6, a concrete pouring construction method in an arch rib of an upper bearing type steel pipe concrete arch bridge comprises the following steps: step one, construction preparation: a. the concrete proportion is selected, the slump is controlled to be 22 cm-27 cm when the concrete is pumped, the expansion is controlled to be 60-70 cm, the T500 time is controlled to be 5-20 s, and the slump passing time is controlled to be 6-10 s; according to design specifications, specification standards and related technical index requirements of C70 self-compaction micro-expansion concrete, a large amount of trial mixing is performed, statistical analysis is performed on detection data of the trial mixing of the concrete according to various design index requirements of the required concrete, mixing proportion and additive are adjusted, the water reducing agent is required to be high in water reducing rate, good in plasticity maintenance performance, and the requirement of concrete jacking construction time is met. And meanwhile, the content of bubbles, particularly large bubbles, is reduced so as to avoid the void caused by the formation of an air film between the inner wall of the steel pipe and the core concrete.
b. Selecting and configuring a pump truck; the calculation formula of the internal pressure loss of the horizontal conveying pipe in the working pump of the conveying pump comprises the following steps:
r-pumping tube radius;
K 1 adhesion coefficient Pa, K 1 ＝(3.0-0.01S)×10 2 ；
K 2 -velocity coefficient Pa/m/s, K 2 ＝(4.0-0.01S)×10 2 ；
U-concrete slump, in cm;
t 2 /t 1 -the ratio of the switching time of the distribution valve to the pushing of the piston against the concrete;
V 0 -average speed of the concrete mix in the delivery pipe, in m/s;
a 0 -the ratio of the radial pressure to the axial pressure of the concrete;
ΔPh-pressure loss due to the flow of concrete in the horizontal transfer pipe;
total pressure loss due to R-concrete flow;
l-pump tube 1 horizontal conversion length;
P f the loss caused by the shearing nails, the flange plates and the pipe wall of the main chord pipe and the pressure loss of the flange plates and the shearing nails sections obtained through process tests are 1.948Kpa/m, and the on-way resistance loss in the steel pipe is 0.511Kpa/m.
Calculated according to 40% displacement of the pump truck, the maximum pressure is 16.02MPa, and the actual displacement on site is 45m 3 And/h, the maximum pressure is 16-17MPa, the calculated data are consistent, and the full bridge is arranged together4 pump trucks, 2 pump trucks are used for first-stage concrete pouring; and the other 2 pump trucks are used for secondary concrete pouring.
c. The arrangement of the pump pipe 1 is that a visual anti-blocking alarm mechanism 2 is arranged on the arc surface of the pump pipe 1, so that the action of blocking alarm caused by expansion of the pump pipe 1 is monitored in the process of filling the pump pipe 1; the visual anti-blocking alarm mechanism 2 comprises a floor slab 21, a steel buried plate 22 is arranged on the surface of the floor slab 21 through high-strength bolts, a supporting plate 23 is arranged on the opposite surface of the top end of the steel buried plate 22 through high-strength bolts, a lower arc-shaped pressing plate 24 is fixedly arranged on the top of the supporting plate 23, and an upper arc-shaped pressing plate 25 is arranged on the surface of the lower arc-shaped pressing plate 24 through high-strength bolts.
Specifically, the effect of pressing, mounting and fixing the circular arc surface of the pump pipe 1 is controlled by the upper and lower arc pressing plates 25 and 24.
The inner wall of the upper arc-shaped pressing plate 25 and the inner wall of the lower arc-shaped pressing plate 24 are adhered with arc-shaped conducting strips 26, the arc inner walls of the arc-shaped conducting strips 26 are fixedly provided with insulating rubber 27, the inner walls of the insulating rubber 27 are extruded with the arc-shaped surface of the pump pipe 1, conducting blocks 28 are arranged between the opposite surfaces of the insulating rubber 27, the surfaces of the conducting blocks 28 are adhered with the arc-shaped surface of the pump pipe 1, the conducting blocks 28 and the arc-shaped conducting strips 26 form a height difference in installation, one end of one arc-shaped conducting strip 26 extends to one side of the upper arc-shaped pressing plate 25, an alarm 29 is fixedly arranged on one side of the upper arc-shaped pressing plate 25, and the alarm 29 is electrically connected with the opposite arc-shaped conducting strips 26.
Specifically so implemented, when the inside of pump line 1 takes place to block up the pipe, this position pump line 1 can take place to expand, extrudees the outside motion of conducting strip 28 and arc conducting strip 26 contact and form closed loop circular telegram operation to transmit to alarm 29 on warning and remind, and automatic monitoring in the real-time to pump line 1 carries, avoid taking place to block up and can't visually know the jam position, thereby cause maintenance change difficulty, influence the efficiency of construction. The device can monitor in real time, and when the alarm 29 alarms, the specific blocking position can be known for quick replacement and maintenance, so that the construction efficiency is enhanced.
The pump pipe 1 is arranged on an overhaul channel beside the inner chord pipe; the single 4 chord pipes share 1 set of pump pipe 1, and the standby pump pipe 1 is arranged from a primary grouting port to a secondary grouting port along an overhaul channel; when the lower chord pipe is poured, a temporary construction platform is erected at the position connected with the lower chord pipe, the pump pipe 1 is arranged on the construction platform, and the pump pipe is turned to the lower chord pipe through an upper chord pipe connecting elbow; the left and right pump pipes 1 are distributed on the inner side of the upper chord pipe, and the outer pump pipe 1 is distributed by the inner pump pipe 1 through a 45-degree elbow.
The pump pipe 16m is provided with a U-shaped clamp, the U-shaped clamp is connected with the overhaul channel, the pump pipe 1 is fixed on the overhaul channel, square timber is added at the position of the reinforcing steel bar, a rubber pad is arranged at the contact position of the top steel plate and the pump pipe 1, and a hand hoist is arranged at the positions of the elbow and each arch rib section.
When the outside air temperature is higher than 30 ℃ or the temperature of the outer wall of the main pipe is higher than 35 ℃, spray cooling measures are taken for the concrete transport vehicle, the conveying pipe, the slurry inlet pipe and the arch rib steel pipes.
d. Selecting a process test; selecting a second-stage main arch steel pipe as a simulation object of a process test; the horizontal pump pipe 1 under the same pumping pressure is converted by the curve lengths of the pump pipes 1 on the steel pipes of the first stage and the second stage, and the actual required pumping pressure is simulated by the detour arrangement of the pump pipes 1; the steel pipe with the same diameter as the main arch is obliquely placed at a test site to simulate the main arch steel pipe; the steel pipes are obliquely arranged at an angle of 45 degrees and 0 degrees and are divided into 2 groups, wherein the angle of 45 degrees is tested 3 times and the angle of 0 degree is tested 1 time.
And determining the concrete performance parameters through experiments, and calculating the distribution rule of the temperature field of the section of the concrete in the pipe, and the capability of detecting the liquid level of the concrete through infrared thermal imaging, wherein the concrete is composed of the on-way resistance pump pipe 1, the steel pipe, the flange plate, the shear nails.
e. A perfusion sequencing arrangement; 16 steel pipes are arranged in the full bridge, the symmetrical pouring is performed for 16 times, 1 steel pipe is poured in a single way, and two spans are poured in an alternative symmetrical way; the single span arch rib pouring principle is that the pouring is firstly performed downwards, then performed upwards, and then performed inwards and outwards.
f. Setting a perfusion node; the grouting hole joint is welded on the side surface of the chord tube of the arch rib, the tube head extending into the chord tube faces the advancing direction, the extending length is 40cm, and the grouting holes of the upper chord tube and the lower chord tube are arranged on the same section vertical to the arch rib; each grouting hole is provided with a stop valve, 4 stiffening plates are connected between the joint and the steel pipe wall, the thickness of each stiffening plate is 10mm, and the length of each stiffening plate is 15cm; the steel pipe opening welding at the grouting hole is completed by a professional welder, and flaw detection is performed;
the slurry outlet holes are steel pipes with diameter of 125mm and are respectively arranged at two sides of the compartment plate, the height is 200cm, and the top of the slurry outlet pipe is provided with an elbow; the vault position sets up two exhaust holes, through ball valve control.
Step two, primary pumping construction: a. testing water in the pump pipe 1 and cleaning the pipe wall; b. the first stage pump is installed and prepared, and a single engine is used for pumping at low pressure in the first stage when the pump truck pumps; c. pumping the concrete in the primary pipe; before each concrete pouring, a water test is carried out on the pump pipe 1, a pump truck is connected with the pump pipe 1, a stop valve is opened, the pump truck is started to pump water into the pump pipe 1, the water leakage state of the pump pipe 1 is checked, the pump pipe 1 is observed to be fixed in the pumping process, and the swaying part is required to be reinforced again; the bottom of the steel pipe is provided with a slag discharging hole, and the water pumped into the pump pipe 1 is directly discharged into the steel pipe and discharged through the slag discharging hole.
Connecting the pump pipe 1 with a valve, pumping 1m 3 water and 1.5m 3 cement mortar with the same label by a pump machine, fully lubricating the wall of the pump pipe 1, and directly discharging the mortar into a main string pipe; and after the mortar is pumped, preparing for primary pumping.
And (3) conveying the concrete to the site, curing the concrete for more than or equal to 0.5 hour, removing large bubbles, detecting the performance of each concrete, and conveying the unqualified concrete to a mixing station for treatment after the concrete reaches the pouring requirement.
Starting a pump machine to pump the concrete in the primary pipe; when the pumping starts, low-speed pressure delivery is adopted, the pressure of the pump and the working condition of each part are observed, and the normal pressure delivery speed is increased after the pressure is smooth; calculating the required square quantity from a pumping port through infrared thermal imaging, realizing filling of concrete below the pumping port by a pump truck and in a pump pipe 1, pumping at a low speed, closing a slurry outlet hole after the concrete slurry is discharged, and tracking the interface height of the concrete in the pumping process; when the surface of the concrete in the pipe is 50cm below the position of the secondary slurry inlet, the pumping displacement is reduced, and the primary pump is pumped slowly.
Step three, secondary pumping construction: a. a primary pump and a secondary pump carry switching operation; discharging slurry pumped at one stage through a horizontal slurry outlet pipe, wherein the slurry discharge sequence is turbid water-mortar-concrete, closing a slurry inlet pipe and a slurry outlet pipe stop valve after the concrete is discharged, disconnecting a main pipe and a primary slurry injection port, timely cleaning a pump machine and a first-stage pump pipe 1, pumping second-stage concrete at the same time, and pumping 1m before pumping 3 After water 1m 3 mortar was pumped.
Concrete pumping in the diode is carried out until the vault, the vault and the slurry outlet pipe are out of slurry, the pump continues pumping concrete until the vault, the slurry outlet pipe and the slurry outlet are out of homogeneous mortar, pumping of concrete is suspended, standing is carried out for 5 minutes, the vent hole is opened, pumping is continued after the exhaust is completed, standing is carried out for 5 minutes again, standing is repeated for 3 times, pumping is stopped after the pumping is carried out and the homogeneous concrete is discharged, and the slurry inlet pipe stop valve is closed, so that pumping pouring of single main chord pipe concrete is completed.
b. The concrete in the pumping diode is operated, the pumping of the second stage adopts high-pressure pumping, two engines are used, and when the rainy weather is met, the automatic rain shielding mechanism 3 arranged on one side of the pumping truck works to perform rain shielding operation; in the third step, the automatic rain shielding mechanism 3 comprises a pump truck body 31, a driving pipe 32 is fixedly arranged on the circular arc surface of one side of the pump truck body 31, a driving sliding groove 33 is formed in the circular arc surface annular array of the driving pipe 32, a driving motor 34 is fixedly arranged on the inner bottom wall of the driving pipe 32, a threaded rod 35 is fixedly arranged on an output shaft of the driving motor 34 through a coupler, the top of the threaded rod 35 is rotatably connected with the inner top wall of the driving pipe 32 through a bearing, and a driving block 36 is in threaded connection with the threaded surface of the threaded rod 35.
In particular, in the rainy day operation, the driving motor 34 is automatically controlled to operate to drive the threaded rod 35 to rotate, so that the driving block 36 is controlled to reciprocate up and down in the vertical direction inside the driving tube 32 in cooperation with the driving chute 33.
The surface annular array of drive piece 36 has first articulated seat 37, and first articulated seat 37's one end articulates through the round pin axle has first connecting rod 38, and first connecting rod 38's one end articulates through the round pin axle has second connecting rod 39, and second connecting rod 39's one end articulates through the round pin axle has second articulated seat 310, and the surface of three second articulated seat 310 all is provided with the rain-proof canvas 311 with the top circular arc surface fixed mounting of drive tube 32, the surface of three second connecting rod 39.
In particular, when the driving block 36 moves upwards, the first connecting rod 38 is driven to push the second connecting rod 39 to spread, so that the rain shielding canvas 311 is utilized for opening, and when the driving block 36 moves downwards, the first connecting rod 38 is driven to pull the second connecting rod 39 to wind.
And step four, dismantling the pump pipe 1 after the pumping construction is finished: detecting compactness; fourthly, after the concrete filled steel tube is poured for 28 days, the compactness of the concrete filled in the steel tube is detected, and a method of combining manual knocking and ultrasonic detection is adopted, wherein a plurality of equidistant points are selected along the periphery of the steel tube for manual knocking detection, and the detection is carried out from the arch feet to the arch crown; when the manual knocking inspection result is abnormal, the detection density is increased, the ultrasonic detection range is determined, and when the ultrasonic detection finds the abnormality, the drilling reinspection is carried out.
According to the invention, holes are formed in the arch leg positions, the pump pipe and the pump truck are connected, concrete is gradually lifted into the steel pipe, and synchronous symmetry is ensured at two sides during pouring.
The high-pressure water pump is installed before pouring, the water outlet of the water pump is in butt joint with the vault slurry outlet pipe, the slag discharging hole is formed in the lower edge of the arch foot steel pipe to discharge sundries, the pump pipe and the valve are connected, the pump pumps cement mortar with the same label, the pipe wall of the pump is fully lubricated, and the mortar is directly discharged into the main chord pipe. When the primary concrete is pumped to the position of the secondary grouting hole, the slurry is discharged through the secondary horizontal slurry discharge hole, the secondary slurry discharge hole is closed, the water and the slurry are pumped by a pump truck, the slurry is directly pumped into the steel pipe, the lubrication of the wall of the steel pipe is ensured, the secondary concrete is pumped, the concrete is pumped to the vault in the diode, the vault slurry outlet pipe begins to flow out of the homogeneous slurry, the pumping of the concrete is suspended, the concrete is kept stand for 5 minutes, then the pumping is repeated three times, the slurry inlet pipe stop valve is closed, and the slurry of the slurry outlet pipe is recovered by adopting the slurry storage barrel.
According to the invention, the automatic rain shielding mechanism 3 is arranged on the surface of the pump truck, so that the sunshade canvas is automatically controlled to be opened and unfolded in rainy days, the feeding end of the pump truck is driven to shield rain, rainwater is prevented from entering the interior of concrete, the quality of concrete pouring is enhanced, the defect of forming bubbles caused by water inflow is prevented, the quality of products is enhanced, the visual anti-blocking alarm mechanism 2 is also arranged for monitoring the conveying blocking state of the pump pipe 1 in real time, the blocking of the part can be clearly known, and quick maintenance and treatment can be quickly and accurately found, so that the construction efficiency is enhanced.
The invention also achieves the purpose that the steel pipe is used as the upper structure of the arch rib, and can effectively bear the load of the bridge. After the concrete is poured, an integrated structure is formed, and the integral rigidity and strength are increased. Shock resistance: the combined structure of the steel pipe and the concrete is excellent in the anti-seismic performance. The steel pipe can absorb and disperse seismic forces, and the concrete can provide stable support and protect the steel pipe. The concrete pouring can effectively protect the steel pipe from being corroded and damaged by the external environment, and the service life of the bridge is prolonged. The construction method of concrete pouring in the arch rib of the upper bearing type steel pipe concrete arch bridge can realize rapid engineering progress. The template is simple to install, the poured concrete is relatively fast, and the construction time is saved. Because the integrated structure is formed after the concrete is poured, the maintenance is more convenient. When maintenance is needed, local repair or replacement can be more easily performed; the steel tube concrete arch bridge has high economical efficiency, high rigidity and strong anti-seismic effect, and the hoop effect of the steel tube on core concrete is utilized to improve the compressive strength of the concrete, so that the cross section of the component and the self weight of the structure are reduced.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. A concrete pouring construction method in the arch rib of an upper bearing type steel pipe concrete arch bridge is characterized in that: the method comprises the following steps: step one, construction preparation: a. the concrete proportion is selected, the slump is controlled to be 22 cm-27 cm when the concrete is pumped, the expansion is controlled to be 60-70 cm, the T500 time is controlled to be 5-20 s, and the slump passing time is controlled to be 6-10 s; b. selecting and configuring a pump truck; c. the arrangement of the pump pipe (1) is characterized in that a visual anti-blocking alarm mechanism (2) is arranged on the arc surface of the pump pipe (1), so that the action of blocking alarm caused by expansion of the pump pipe (1) is monitored in the process of filling the pump pipe (1); d. selecting a process test; e. a perfusion sequencing arrangement; f. setting a perfusion node;
step two, primary pumping construction: a. the pump pipe (1) is used for testing water and cleaning the pipe wall; b. the first stage pump is installed and prepared, and a single engine is used for pumping at low pressure in the first stage when the pump truck pumps; c. pumping the concrete in the primary pipe;
step three, secondary pumping construction: a. a primary pump and a secondary pump carry switching operation; b. the concrete in the pumping diode is operated, the pumping of the second stage adopts high-pressure pumping, two engines are used, and when the rainy weather is met, the automatic rain shielding mechanism (3) arranged on one side of the pumping truck works to perform rain shielding operation;
step four, dismantling the pump pipe (1) after the pumping construction is finished: and (5) performing compactness detection.
2. The method for pouring concrete into the arch rib of the upper bearing type steel tube concrete arch bridge according to claim 1, which is characterized in that: in the first step, the calculation formula of the internal pressure loss of the horizontal conveying pipe in the working pump of the conveying pump is as follows:
r-pumping tube radius;
K 1 adhesion coefficient (Pa), K 1 ＝(3.0-0.01S)×10 2 ；
K 2 -velocity coefficient (Pa/m/s), K 2 ＝(4.0-0.01S)×10 2 ；
S-concrete slump, unit cm;
t 2 /t 1 -the ratio of the switching time of the distribution valve to the pushing of the piston against the concrete;
V 0 average speed of the concrete mix in the conveying pipe, unitm/s；
a 0 -the ratio of the radial pressure to the axial pressure of the concrete;
ΔPh-pressure loss due to the flow of concrete in the horizontal transfer pipe;
total pressure loss due to P-concrete flow;
the L-pump pipe (1) is horizontally converted into length;
P f the loss caused by the shearing nails, the flange plates and the pipe wall of the main chord pipe and the pressure loss of the flange plates and the shearing nails sections obtained through process tests are 1.948Kpa/m, and the on-way resistance loss in the steel pipe is 0.511Kpa/m;
calculated according to 40% displacement of the pump truck, the maximum pressure is 16.02MPa, and the actual displacement on site is 45m 3 And (3) h, setting 4 pump trucks in total in the full bridge, wherein the maximum pressure is 16-17MPa, and the total bridge is consistent with the calculated data, and the 2 pump trucks are used for first-stage concrete pouring; and the other 2 pump trucks are used for secondary concrete pouring.
3. The method for pouring concrete into the arch rib of the upper bearing type steel tube concrete arch bridge according to claim 1, which is characterized in that: in the third step, the automatic rain shielding mechanism (3) comprises a pump truck body (31), a driving pipe (32) is fixedly arranged on one side circular arc surface of the pump truck body (31), a driving chute (33) is formed in a circular arc surface annular array of the driving pipe (32), a driving motor (34) is fixedly arranged on the inner bottom wall of the driving pipe (32), a threaded rod (35) is fixedly arranged on an output shaft of the driving motor (34) through a coupler, the top of the threaded rod (35) is rotatably connected with the inner top wall of the driving pipe (32) through a bearing, a driving block (36) is connected with the threaded surface of the threaded rod (35), a first hinging seat (37) is arranged on a circular arc surface annular array of the driving block (36), a first connecting rod (38) is hinged to one end of the first connecting rod (38) through a pin shaft, a second connecting rod (39) is hinged to one end of the second connecting rod (39) through a pin shaft, three second hinging seats (310) are rotatably connected with the inner top wall of the driving pipe (32) through bearings, and the third connecting rod (39) is fixedly arranged on the surface of the top of the driving pipe (32);
in the first step, the visual anti-blocking alarm mechanism (2) comprises a floor slab (21), a steel buried plate (22) is installed on the surface of the floor slab (21) through high-strength bolts, a supporting plate (23) is installed on the opposite top surfaces of the steel buried plate (22) through high-strength bolts, a lower arc-shaped pressing plate (24) is fixedly installed on the top of the supporting plate (23), an upper arc-shaped pressing plate (25) is installed on the surface of the lower arc-shaped pressing plate (24) through high-strength bolts, arc-shaped conducting strips (26) are adhered to the inner wall of the upper arc-shaped pressing plate (25) and the inner wall of the lower arc-shaped pressing plate (24), insulating rubber (27) is fixedly installed on the inner wall of each arc-shaped conducting strip, a plurality of the inner walls of the insulating rubber (27) are extruded with the arc-shaped surface of the pump pipe (1), conducting blocks (28) are arranged between the opposite spaced surfaces of the insulating rubber (27), the surfaces of the conducting blocks (28) are adhered to the arc-shaped surfaces of the pump pipe (1), the conducting blocks (28) are adhered to one side of the arc-shaped conducting strips (26) which are fixedly arranged on one side of the arc-shaped pressing plate (25), the alarm (29) is electrically connected with the opposite arc-shaped conducting plates (26).
4. The method for pouring concrete into the arch rib of the upper bearing type steel tube concrete arch bridge according to claim 1, which is characterized in that: the pump pipe (1) is arranged on an overhaul channel beside the inner chord pipe in the first step; the single 4 chord pipes share 1 set of pump pipe (1), and the standby pump pipe (1) is arranged from a primary grouting port to a secondary grouting port along an overhaul channel; when the lower chord pipe is poured, a temporary construction platform is erected at the position connected with the lower chord pipe, a pump pipe (1) is arranged on the construction platform, and is connected with an elbow through an upper chord pipe to be turned to the lower chord pipe; the left and right pump pipes (1) are distributed on the inner side of the upper chord pipe, and the outer pump pipe (1) is arranged by the inner pump pipe (1) through a 45-degree elbow;
a U-shaped clamp is arranged at the 6m position of the pump pipe (1), the U-shaped clamp is connected with an overhaul channel, the pump pipe (1) is fixed on the overhaul channel, square timber is added at the position of a reinforcing steel bar, a rubber pad is arranged at the contact position of a top steel plate and the pump pipe (1), and a chain block is arranged at the positions of an elbow and each arch rib section;
when the outside air temperature is higher than 30 ℃ or the temperature of the outer wall of the main pipe is higher than 35 ℃, spray cooling measures are taken for the concrete transport vehicle, the conveying pipe, the slurry inlet pipe and the arch rib steel pipes.
5. The method for pouring concrete into the arch rib of the upper bearing type steel tube concrete arch bridge according to claim 1, which is characterized in that: selecting a second-stage main arch steel pipe as a simulation object of a process test; the horizontal pump pipe (1) under the same pumping pressure is converted by the curve length of the pump pipe (1) on the steel pipes of the first stage and the second stage, and the actually required pumping pressure is simulated by the roundabout arrangement of the pump pipe (1); the steel pipe with the same diameter as the main arch is obliquely placed at a test site to simulate the main arch steel pipe; the inclined arrangement angle of the steel pipes is 45 degrees and 0 degrees, and the steel pipes are divided into 2 groups, wherein the 45 degrees are tested 3 times and the 0 degrees are tested 1 time;
and determining concrete performance parameters, calculating on-way resistance (pump pipe (1), steel pipe, flange plate and shear pin), and detecting the liquid level capacity of the concrete by infrared thermal imaging according to the distribution rule of the temperature field of the section of the concrete in the pipe.
6. The method for pouring concrete into the arch rib of the upper bearing type steel tube concrete arch bridge according to claim 1, which is characterized in that: the method comprises the following steps of arranging 16 steel pipes in a full bridge mode, symmetrically pouring the steel pipes for 16 times, pouring 1 steel pipe once, and alternately and symmetrically pouring two spans; the single span arch rib pouring principle is that the pouring is firstly performed downwards, then performed upwards, and then performed inwards and outwards.
7. The method for pouring concrete into the arch rib of the upper bearing type steel tube concrete arch bridge according to claim 1, which is characterized in that: the grouting hole joint is welded on the side surface of a chord tube of the arch rib, the tube head extending into the chord tube faces the advancing direction, the length of the tube head extends into the chord tube is 40cm, and the grouting holes of the upper chord tube and the lower chord tube are arranged on the same section vertical to the arch rib; each grouting hole is provided with a stop valve, 4 stiffening plates are connected between the joint and the steel pipe wall, the thickness of each stiffening plate is 10mm, and the length of each stiffening plate is 15cm; the steel pipe opening welding at the grouting hole is completed by a professional welder, and flaw detection is performed;
the slurry outlet holes are steel pipes with diameter of 125mm and are respectively arranged at two sides of the compartment plate, the height is 200cm, and the top of the slurry outlet pipe is provided with an elbow; the vault position sets up two exhaust holes, through ball valve control.
8. The method for pouring concrete into the arch rib of the upper bearing type steel tube concrete arch bridge according to claim 1, which is characterized in that: step two, performing a water test on the pump pipe (1) before each concrete pouring, connecting the pump truck with the pump pipe (1), opening a stop valve, starting the pump truck to pump water into the pump pipe (1), checking the water leakage state of the pump pipe (1), observing that the pump pipe (1) is fixed in the pumping process, and re-reinforcing the swaying part; the bottom of the steel pipe is provided with a slag discharging hole, and water pumped into the pump pipe (1) is directly discharged into the steel pipe and discharged through the slag discharging hole;
connecting the pump pipe (1) with a valve, pumping 1m 3 water and 1.5m 3 cement mortar with the same label by a pump, fully lubricating the wall of the pump pipe (1), and directly discharging the mortar into a main string pipe; after the mortar is pumped, preparing a primary pumping;
the concrete is transported to the site, the concrete is fully cured for more than or equal to 0.5 hour, large bubbles are removed, performance detection is carried out on each car of concrete, each car of concrete meets the pouring requirement, and the unqualified concrete is transported to a mixing station for treatment;
starting a pump machine to pump the concrete in the primary pipe; when the pumping starts, low-speed pressure delivery is adopted, the pressure of the pump and the working condition of each part are observed, and the normal pressure delivery speed is increased after the pressure is smooth; calculating the required square quantity from a pumping port through infrared thermal imaging, realizing filling of concrete below the pumping port by a pump truck and in a pump pipe (1), pumping at a low speed, closing a slurry outlet after the concrete slurry is discharged, and tracking the interface height of the concrete in the pumping process; when the surface of the concrete in the pipe is 50cm below the position of the secondary slurry inlet, the pumping displacement is reduced, and the primary pump is pumped slowly.
9. The method for pouring concrete into the arch rib of the upper bearing type steel tube concrete arch bridge according to claim 1, which is characterized in that: discharging the slurry pumped at one stage through a horizontal slurry outlet pipe, wherein the slurry discharging sequence is turbid water-mortar-concrete, after the concrete is discharged, closing a slurry inlet pipe and a slurry outlet pipe stop valve, disconnecting a main pipe and a primary slurry inlet, timely cleaning a pump machine and a primary pump pipe (1), pumping the second-stage concrete at the same time, and pumping 1m before pumping 3 Pumping 1m 3 mortar after water;
concrete pumping in the diode is carried out until the vault, the vault and the slurry outlet pipe are out of slurry, the pump continues pumping concrete until the vault, the slurry outlet pipe and the slurry outlet are out of homogeneous mortar, pumping of concrete is suspended, standing is carried out for 5 minutes, the vent hole is opened, pumping is continued after the exhaust is completed, standing is carried out for 5 minutes again, standing is repeated for 3 times, pumping is stopped after the pumping is carried out and the homogeneous concrete is discharged, and the slurry inlet pipe stop valve is closed, so that pumping pouring of single main chord pipe concrete is completed.
10. The method for pouring concrete into the arch rib of the upper bearing type steel tube concrete arch bridge according to claim 1, which is characterized in that: fourthly, after the concrete filled steel tube is poured for 28 days, the compactness of the concrete filled in the steel tube is detected, and a method of combining manual knocking and ultrasonic detection is adopted, wherein a plurality of equidistant points are selected along the periphery of the steel tube for manual knocking detection, and the detection is carried out from the arch feet to the arch crown; when the manual knocking inspection result is abnormal, the detection density is increased, the ultrasonic detection range is determined, and when the ultrasonic detection finds the abnormality, the drilling reinspection is carried out.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117907196A (en) * | 2024-03-20 | 2024-04-19 | 四川省公路规划勘察设计研究院有限公司 | Detection system for reinforcing masonry arch bridge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117907196A (en) * | 2024-03-20 | 2024-04-19 | 四川省公路规划勘察设计研究院有限公司 | Detection system for reinforcing masonry arch bridge |
| CN117907196B (en) * | 2024-03-20 | 2024-05-17 | 四川省公路规划勘察设计研究院有限公司 | Detection system for reinforcing masonry arch bridge |
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