CN102758531B - In-pipe concrete vacuum auxiliary filling method for large concrete-filled steel tubular structure and filling system - Google Patents
In-pipe concrete vacuum auxiliary filling method for large concrete-filled steel tubular structure and filling system Download PDFInfo
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Abstract
The invention discloses an in-pipe concrete vacuum auxiliary filling method for a large concrete-filled steel tubular structure and a filling method. The filling method comprises the following steps: preparing in-pipe concrete, grading structural pipes, placing graded filling devices, placing a vacuumizing device and checking gas tightness of the system, and grading and continuously filling in-pipe concrete under the vacuum negative pressure condition. The concrete is graded and filled, so that the influence of later filled concrete on coagulation of the filled concrete is avoided, and the mechanical property of the large concrete-filled steel tubular structure is improved, meanwhile, the requirement to the pumping capacity of the concrete pumping device is reduced; and the method and the system bring good economic effects. The concrete is filled continuously, so that the working period is shortened; under the negative pressure condition, the concrete is filled, thus the compactness of concrete and tightness of the concrete binding with the steel pipes are reinforced; and the quality of the steel pipe concrete structure is further improved.
Description
Technical field
The present invention relates to the encased structures method for filling, particularly large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method and filling system.
Background technology
Encased structures refers to that in steel pipe fill concrete forms and steel pipe and concrete thereof can bear the structural element of external load function jointly, press the difference of cross sectional shape, can be divided into the concrete filled steel tube structure, side, concrete-filled rectangular steel tube structure and polygonal steel pipe concrete structure etc.
Known, concrete has excellent compressive strength, but its bending resistance is very weak; Steel, particularly shaped steel have good counter-bending ability and good elastoplasticity, but when pressurized easy unstability and lose the axial compression resistance ability.The encased structures that Concrete Filled is formed in steel pipe structurally can make concrete be in the side loaded state with both advantages together, and its compressive strength is significantly improved; Due to concrete existence, improved the rigidity of steel pipe, both play a role jointly, thereby have improved greatly its supporting capacity; Simultaneously encased structures also has the advantages such as easy construction and decay resistance, anti-seismic performance, fireproof performance are good.Based on these advantages, make encased structures as a kind of emerging combining structure, be widely used in various large scale structures, as Loads of Long-span Bridges and highrise building etc.
In encased structures, concrete compactness is the key that affects the encased structures supporting capacity, and the tight set between steel pipe inner wall and concrete is the key that the carrying effect is coordinated in the encased structures performance.But, usually during concrete perfusion is constructed in the encased structures pipe, occur pore and concrete and steel pipe walls in concrete and the phenomenon of coming to nothing occurs because the various shrinkage factors of concrete cause, simultaneously, also very easily form one deck air film between concrete and steel pipe inner wall, have a strong impact on the bonding of concrete and steel pipe inner wall, thereby limited the performance of steel pipe to the effect of concrete cuff, affected the functional performance of encased structures.
Chinese invention patent application CN 102296818A discloses a kind of method of vacuum pouring of concrete in steel pipe, the method has adopted vacuum pump to discharge the air that will pour in steel pipe, make that in the steel pipe that will pour into, vacuum reaches-0.1MPa～-0.09MPa, then with concrete pump, concrete is injected in this steel pipe, and continue to and be full of concrete in steel pipe.Adopt the method effectively to reduce the number of bubbles of adhering on the tube wall and improved concrete density, make the functional performance of encased structures obtain significantly improving, solved the problem of coming to nothing that former employing pressure injection encased structures exists.Under this vacuum condition, it is feasible that the method for pipe inner concrete continous pouring is poured into for small-sized steel pipe.but, this continous pouring method can't realize large-scale steel pipe concrete structure (Loads of Long-span Bridges, highrise building etc.) filling concrete construction, particularly, because the method is that the pipe inner concrete is carried out continous pouring, large or the height superelevation due to large-scale steel pipe concrete structure pipe span, the filling concrete amount is large, infusion time is long, also do not pour into when complete at the structural tube inner concrete, initial set of the concrete that first pours in pipe, after concrete initial set begins, cement paste in concrete losing plasticity and mobility and beginning to condense and become gel gradually, until cement paste is all formed gel.In this process, make formed gel fracture if run into external force, decline due to cement paste plasticity and mobility, the gel of fracture can not be closed voluntarily, defects i.e.cracks appears in the concrete in the encased structures spare that finally causes obtaining, and seriously influence the each side functional performance of encased structures, even cause encased structures spare to be scrapped.
Because having cost for bridge and high-building construction for other structural concepts, obviously reduces encased structures, the characteristics of function admirable, therefore, in the urgent need to a kind of effective ways that can realize the large-scale steel pipe filling concrete.
Summary of the invention
The object of the present invention is to provide a kind of encased structures pipe inner concrete compactness that makes that makes high, concrete is combined with structural tube closely, large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method and filling system that the encased structures mechanical property is significantly improved.
To achieve these goals, the invention provides following two kinds of technical schemes, one of them is: a kind of large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method comprises the following steps:
Large-scale steel pipe concrete structure pipe is carried out classification from bottom to up, satisfy complete every grade of concrete time of perfusion during classification less than the described concrete initial setting time;
Begin structural tube internal classification concrete perfusion from one-level bottom, when concrete perfusion, guarantee that structural tube inside is in vacuum negative pressure condition.
Further, described structural tube internal classification concrete perfusion refers to that the perfusion of previous stage pipe inner concrete is complete, then carries out the next stage filling concrete; Continous pouring is adopted in perfusion to any one-level pipe inner concrete.
The present invention adopts the classification method for filling, has guaranteed to complete the perfusion of one-level inner concrete before concrete initial set.Described classification is according to the height of concrete engineering needs pumping, length and encased structures pipe supervisor pipe diameter size, determines in conjunction with the pumpability of concrete pump.
Preferably, in described structural tube inner vacuum be-0.060MPa～-0.100MPa.
Preferably, the vacuum in described structural tube be-0.070MPa～-0.090MPa.
Preferably, the vacuum in described structural tube be-0.075MPa～-0.086MPa.Obtain through countless tests, keep in the encased structures pipe vacuum for-0.075MPa～-0.086MPa manages the perfusion of inner concrete, namely can realize the object of the invention.
Structural tube of the present invention top arranges partition panel.Described partition panel separates structural tube inside from the top, play a part to cut off and the hermetically-sealed construction pipe at the structural tube concrete perfusion with when vacuumizing.
Further, described structural tube at bottom end opening joint steel pipes at different levels as inlet pipe.Inlet pipe connects concrete pump when the reperfusion structure pipe concrete, and concrete pump pumps into the pump inner concrete in the encased structures pipe by inlet pipe.
Further, described inlet pipe also can adopt other tubing.
Further, on described inlet pipe, flap valve is installed.Described flap valve is opened, and concrete pump pumps into the pump inner concrete in the encased structures pipe by inlet pipe; Described closure of check ring, flap valve cuts off concrete pump and encased structures pipe, makes the concrete in encased structures pipe pipe can not be back to concrete pump; During the reperfusion structure pipe concrete, the corresponding flap valve of perfusion level structure pipe is opened, and the closure of check ring that all the other structural tube at different levels are corresponding makes structural tube be in sealing state.
Further, described structural tube at top end opening joint steel pipes at different levels as outlet pipe.The effect of outlet pipe is whether be convenient to observe the filling concrete of its place one-level encased structures pipe complete, if concrete reaches in outlet pipe corresponding to described level, illustrates that the filling concrete of its place one-level is complete.
Further, described outlet pipe also can adopt other tubing.
Further, on described outlet pipe, valve is installed.When vacuumizing in the encased structures pipe, described valve closing is used for sealed steel pipe concrete structure pipe; When stopping vacuumizing, valve opening is outside the concrete surface layer laitance discharge pipe with its place one-level perfusion.
In a kind of large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method of the present invention, also set two cover concrete pumps.
Further, described two cover concrete pumps advance inlet pipe and are connected with adjacent two respectively in the mode of alternate relay.The mode of this two cover concrete pump alternate relays can improve utilization rate of equipment and installations, can also save the time of waiting for erection equipment, has improved efficiency of construction.
The present invention also is equipped with and vacuumizes accessory system.The described accessory system that vacuumizes is used for vacuumizing in the encased structures pipe.
Further, the described accessory system that vacuumizes is that two covers vacuumize accessory system.Because the vacuum the during perfusion of pipe inner concrete in holding tube is larger on every grade of concrete Forming Quality impact of pouring into continuously, in order to guarantee in time to change after vacuumizing accessory system is out of order, therefore, generally prepare on construction ground two covers and vacuumize accessory system.
Further, the described accessory system that vacuumizes is connected with the outlet pipe of afterbody structural tube, makes the structural tube pipe structure simplify, and still can continue concrete perfusion after also making the perfusion of structural tube inner concrete full simultaneously, has guaranteed that the pipe top divides concrete quality.
Further, the described accessory system that vacuumizes comprises vacuum pump, gas storage/slurry bucket, valve and exhaust tube, wherein, described gas storage/slurry bucket one side is connected by exhaust tube with vacuum pump, and vacuum detecting table and valve be installed successively on this pump-line, opposite side is connected by the outlet pipe of exhaust tube with the afterbody of structural tube, and described gas storage/slurry bottom of the barrel is provided with outlet pipe, and on this outlet pipe mounted valve.The valve opening of the outlet pipe of described gas storage/slurry bottom of the barrel is discharged the slurries in bucket.Described vacuum pump vacuumizes in managing by the outlet pipe of encased structures pipe afterbody structural tube.
The present invention detects the tightness of respectively advancing outlet pipe, valve and structural tube before described reperfusion structure pipe inner concrete.Detecting bubble-tight purpose is to vacuumize in subsequent handling to prepare.
Further, open the outlet pipe valve on the afterbody structural tube, and close all the other structural tube at different levels and advance valve on outlet pipe, structural tube is vacuumized, the vacuum of its vacuum during higher than described concrete perfusion, and can pressurize more than two minutes.Otherwise, improve sealing device until sealing reaches requirement.
Further, before described concrete perfusion first to injecting appropriate clear water and cement paste in structural tube, with lubricated concrete transfer pump tube.
Further, after described lubricated concrete transfer pump tube, start concrete pump and vacuumize accessory system, concrete pump continous pouring concrete, stop vacuumizing accessory system when concrete reaches first order structural tube outlet pipe position, and open the valve of gas storage/slurry barrel lower end, after the structural tube internal gas pressure reaches normal atmosphere (An), open first order structural tube outlet pipe valve, close after getting rid of the concrete surface layer laitance;
open second level structural tube inlet pipe valve, stop simultaneously being connected concrete pump with first order structural tube inlet pipe, close the valve on first order structural tube inlet pipe, another set of concrete pump is connected with second level structural tube inlet pipe, and start this cover concrete pump, inject appropriate clear water and cement mortar, then concrete perfusion, start and vacuumize accessory system, concrete perfusion process and vacuum are identical with the perfusion of first order structural tube, the concrete pump that will be connected with first order structural tube inlet pipe is simultaneously pulled down, and be connected with third level structural tube inlet pipe, follow-up perfusion step is identical with second level structural tube perfusion step with the first order,
After the full afterbody structural tube of filling concrete, enter storage slurry/gas bucket along exhaust pipe, after laying in enough concrete slurries in this barrel, open the outside plasma discharge of valve of gas storage/slurry barrel lower end, after the slurries quality of discharging reaches requirement, stop successively concrete pump and pumped vacuum systems, complete the perfusion of encased structures.
Further, concrete of the present invention is high-grade concrete.
Further, high-grade concrete of the present invention is high performance concrete.China's " high performance concrete application technology rules " (CECS207-2006) is defined as high performance concrete: adopt conventional material and explained hereafter, have concrete structure and require every mechanical property, concrete with high-durability, high workability and high volume stability, the present invention adopts high performance concrete as the concrete perfusion in encased structures, makes the encased structures that makes possess excellent functional performance and mechanical property.
Further, add water reducing agent, expansion agent and antishrinking agent in described high performance concrete.
Further, described water reducing agent is the high-performance poly carboxylic acid water reducing agent.
Further, the slump of described high performance concrete is 180mm～240mm.
another technical scheme of the present invention is: a kind of filling system of large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method, described filling system comprises auxiliary pouring device on structural tube, the concrete pump set and vacuum extractor, auxiliary pouring device on described structural tube, comprise inlet pipe, outlet pipe and partition panel, described inlet pipe and outlet pipe are separately positioned on bottom and the top of every level structure pipe, described partition panel is arranged on the structural tube top and is sealed and matched with structural tube, every grade of inlet pipe is provided with flap valve, be provided with valve on every grade of outlet pipe, described the concrete pump set adopts concrete pump, the inlet pipe of the structural tube place level of described concrete pump and perfusion is connected, described vacuum extractor comprises vacuum pump, gas storage/slurry bucket, valve and exhaust tube, described gas storage/slurry bucket one side is connected by exhaust tube with vacuum pump, and vacuum detecting table and valve be installed successively on this pump-line, opposite side is connected with the afterbody outlet pipe of structural tube by another root exhaust tube, described gas storage/slurry bottom of the barrel is provided with outlet pipe, and on this outlet pipe, valve is installed.
large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method and filling system, adopt negative pressure of vacuum supplementary classification concrete perfusion to make the large-scale steel pipe concrete structure, in filling process, owing to passing through the structural tube classification, then successively structural tube at different levels is carried out filling concrete, make follow-up concrete perfusion not affect to have poured into the concrete of steel pipe and condense, thereby avoided follow-up concrete perfusion to destroy the gel that in the concrete that first is fed into, cement paste condenses into, concrete defects i.e.cracks quantity in the large-scale steel pipe concrete structure that makes is significantly reduced, from significantly having improved the quality of encased structures, also reduce simultaneously the requirement to coagulation pumping equipment pumpability, saved construction cost.
Concrete perfusion under condition of negative pressure in structural tube, reduced the quantity of structure inside pipe wall bubbles attached, strengthened the compactness that structural tube is combined with concrete, reduced the number of bubbles in the concrete, strengthen concrete compactness in encased structures, thereby improved the quality of encased structures.
Filling system adopts the relay settings of two cover pumping equipments, makes that between every level structure pipe concrete perfusion, the equipment set-up time shortens dramatically, and has improved operating efficiency, has shortened the duration.
Compared with prior art, beneficial effect of the present invention:
(1) adopt the method for classification perfusion to solve the impact that follow-up concrete perfusion is condensed on first concrete perfusion, thereby significantly improved mechanical property and the functional performance of large-scale steel pipe concrete structure.
(2) reduced the quantity of steel pipe inner wall bubbles attached, strengthened the compactness that steel pipe is combined with concrete, reduce the number of bubbles in the concrete, strengthened concrete compactness in encased structures, thereby improved mechanical property and other combination properties of encased structures.
(3) reduce requirement to coagulation pumping equipment pumpability, saved construction cost.
(4) due to the raising of encased structures quality, the minimizing of defective has reduced follow-up repair to the encased structures defective.
Description of drawings:
Fig. 1 is process chart of the present invention;
Fig. 2 is classification intrusion pipe inner concrete system layout:
In Fig. 2: 21-structural tube, 22-one-level inlet pipe, 23-one-level flap valve, 24-concrete pump I, 25-concrete pump II, 26-secondary check valve, 27-secondary inlet pipe, 28-three grades of flap valve, 29 3 grades of inlet pipes, 210-three grades of outlet pipes, 211-partition panel, 212-secondary outlet pipe valve, 213-secondary outlet pipe, 214-one-level outlet pipe, 215-one-level outlet pipe valve;
Fig. 3 is for vacuumizing the auxiliary system equipment arrangement diagram:
In Fig. 3: 31-vacuum pump, 32-valve, three, 33-vacuum detecting table, 34-storage slurry/gas bucket, 35-exhaust tube, 36-valve, one, 37-valve two, 38-storage slurry/gas bucket outlet pipe.
Fig. 4 is that ultrasonic examination adopts the cross section of the encased structures that the inventive method makes to arrange schematic diagram:
In Fig. 4: a0-cross section a0, a1-cross section a1, a2-cross section a2, a3-cross section a3, a4-cross section a4, a5-cross section a5, a6-cross section a6, a7-cross section a7, a8-cross section a8, a9-cross section a9, a10-cross section a10, a11-cross section a11, a12-cross section a12, a13-cross section a13, a14-cross section a14, a15-cross section a15, a16-cross section a16, a17-cross section a17;
Fig. 5 is that ultrasonic examination adopts the test channel of the encased structures that the inventive method makes to arrange schematic diagram;
In Fig. 5: A1-test channel A1, A2-test channel A2, A3-test channel A3, A4-test channel A4.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing, embodiment and test example.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment, all technology that realizes based on content of the present invention all belong to scope of the present invention.
As shown in Figure 1, a kind of large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method (the present embodiment is used for perfusion Long-Span Concrete Filled Steel Tubular Arch Bridges bridge arch, and its span is 500m) comprises the steps:
(1) preparation high performance concrete: adopt high-performance poly carboxylic acid water reducing agent, expansion agent and water reducing agent, according to different concrete grades, adjust its match ratio, make concrete slump reach 180mm～240mm, 6 hours～12 hours initial setting time.
(2) determine the perfusion hierarchy plan, according to height, length and the structural tube pipe diameter size of the present embodiment requirement of engineering pumping, determine classification perfusion scheme in conjunction with the pumping equipment pumpability.As shown in Figure 2, the present embodiment is divided into arch rib three grades from the arch springing to the vault, i.e. one-level, secondary and three grades, and the time of satisfying the complete every grade of arch rib inner concrete of perfusion during classification is less than or equal to the described concrete initial setting time.
(3) arrange pumping equipment according to the hierarchy plan of step (2), as shown in Figure 2, open suitable hole and connect corresponding inlet pipe and outlet pipe on the top of steel tube arch ribs at different levels and terminal respectively, and on every inlet pipe, flap valve is installed, mounted valve on every outlet pipe; The one-level inlet pipe is connected a concrete pump; And at vault position welding partition panel.For inlet pipe, the outlet pipe that guarantees each classification point of structural tube keeps sealing at work progress, adopt the good valve of tightness.
(4) prepare to vacuumize accessory system, as shown in Figure 3, the described accessory system that vacuumizes comprises vacuum pump 31, gas storage/slurry bucket 34, valve 3 32, valve 2 37, valve 1, vacuum detecting table 33, exhaust tube 1, exhaust tube 2 39 and gas storage/slurry bucket 38, wherein, described gas storage/slurry bucket 34 1 sides are connected by exhaust tube 2 39 with vacuum pump 31, and vacuum detecting table 33 and valve 3 32 be installed successively on exhaust tube 2 39, opposite side is connected by 21 3 grades of outlet pipes 210 of exhaust tube 1 and structural tube, and on exhaust tube 1 mounted valve 1, described gas storage/slurry barrel 34 bottoms are provided with gas storage/slurry bucket outlet pipe 38, and on this gas storage/slurry bucket outlet pipe 38 mounted valve 2 37.In the present embodiment, configuration two covers vacuumize accessory system, its objective is that a cover pumped vacuum systems is out of order in construction, and another set of pumped vacuum systems can be substituted immediately can not stop filling concrete.
(5) before reperfusion structure pipe 21 inner concretes, detect the tightness of respectively advancing outlet pipe, valve and structural tube.Described detection tightness method is: open valve 1, and close the inlet pipe on all the other structural tube 21 at different levels, the valve on outlet pipe, start vacuum pump 31, make vacuum reach-0.075MPa～-0.085MPa, and can pressurize more than two minutes.
(6) start the concrete pump I 24 that is connected with one-level inlet pipe 22, enter pumping liquid concrete after the suitable quantity of water cement mortar to the interior infusion of primary structure pipe 21, start and vacuumize accessory system, the vacuum of structural tube interior 21 is reached-0.075MPa～-0.085MPa, concrete pump I 24 uninterrupted pumping concrete, until concrete is when reaching one-level outlet pipe 214 position, stop vacuumizing, opening valve 2 37 makes structural tube 21 internal gas pressures to normal atmosphere (An), open one-level outlet pipe valve 215, the concrete laitance is discharged, after laitance is drained, close one-level outlet pipe valve 215.Stop concrete pump I 24, close flap valve 23 and valve 2 37, open two flap valve 26.
(7) start the concrete pump II 25 that is connected with secondary inlet pipe 27, the pump line of cleaning and lubricated concrete pump II 25.Concrete pump II 25 uninterrupted pumping concrete are to secondary structure pipe 21, and secondary structure pipe 21 concrete perfusions and vacuum are identical with primary structure pipe 21.
In perfusion secondary structure pipe 21, the concrete pump I 24 that will be connected with one-level inlet pipe 22 pulls down, and then is connected with three grades of inlet pipes 29.The switch operating that pours between the switch operating of perfusion and primary structure pipe 21 and secondary structure pipe 21 between secondary structure pipe 21 and tertiary structure pipe 21 is identical.
(9) start the concrete pump I 24 that is connected with three grades of inlet pipes 29, the pump line of cleaning and lubricated concrete pump I 24.Concrete pump I 24 uninterrupted pumping concrete are to tertiary structure pipe 21, and tertiary structure pipe 21 concrete perfusions and vacuum are identical with primary structure pipe 21.
When concrete reaches three grades of outlet pipe 210 positions, continue concrete perfusion, concrete enters storage slurry/gas bucket 34 along exhaust tube 35, after laying in enough concrete slurries in this barrel, open the outside plasma discharge of valve 2 37, after the slurries quality of discharging reaches requirement, stop successively concrete pump I 24 and vacuum pump 31, complete the perfusion of encased structures pipe.
Ultrasonic detection method is adopted in detection for the complete concrete filled steel tube Forming Quality of construction at present, and methods when adopting Mintrop wave sound in ultrasound examination more, generally can the pouring quality of concrete filled steel tube be divided into five classes as shown in table 1 by the velocity of sound that detects.
Table 1 concrete filled steel tube pouring quality criteria for classification:
| Quality specifications | High-quality | Well | Suspicious | Relatively poor | Extreme difference |
| Sonic velocity change scope (m/s) | ＞4120 | 3300～4120 | 2750～3300 | 1920～2750 | ＜1920 |
By the long-span steel pipe concrete bridge arch that the method for the present embodiment is constructed and made, press detection position as shown in Figure 4, and the layout of test channel as shown in Figure 5 schematic diagram, this concrete bridge arch tube is charged to table 2 with testing result.
Table 2 ultrasound examination result (m/s of velocity of wave unit):
4 comparison sheet 2 and tables 1 by reference to the accompanying drawings, as can be known, the long-span steel pipe concrete bridge arch that adopts large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method of the present invention and filling system to make, structural tube inner concrete compactness is high, structural tube is combined closely with concrete, makes encased structures quality high-quality.
as shown in Figure 2, the filling system of the described large-scale steel pipe concrete structure of the present embodiment pipe inner concrete vacuum auxiliary pouring method, comprise auxiliary pouring device on structural tube, the concrete pump set and vacuum extractor, auxiliary pouring device on described structural tube, comprise one-level inlet pipe 22, secondary inlet pipe 27, three grades of inlet pipes 29, one-level outlet pipe 214, secondary outlet pipe 213, three grades of outlet pipes 210 and partition panel 211, described one-level inlet pipe 22, secondary inlet pipe 27, three grades of inlet pipes 29, one-level outlet pipe 214, secondary outlet pipe 213, three grades of outlet pipes 210 are separately positioned on bottom and the top of every level structure pipe 21, described partition panel 211 is arranged on structural tube 21 tops and is sealed and matched with structural tube, be provided with one-level flap valve 23 on one-level inlet pipe 22, be provided with secondary check valve 26 on secondary inlet pipe 27, be provided with three grades of flap valve 28 on three grades of inlet pipes 29, be provided with one-level outlet pipe valve 215 on one-level outlet pipe 214, be provided with secondary outlet pipe valve 212 on secondary outlet pipe 213, described the concrete pump set adopts concrete pump I 24 and concrete pump II25, described concrete pump I 24 is connected with concrete pump II and is connected with the inlet pipe of structural tube 21 place levels of perfusion, as shown in Figure 3, the described accessory system that vacuumizes comprises vacuum pump 31, gas storage/slurry bucket 34, valve 3 32, valve 2 37, valve 1, vacuum detecting table 33, exhaust tube 1, exhaust tube 2 39 and gas storage/slurry bucket 38, wherein, described gas storage/slurry bucket 34 1 sides are connected by exhaust tube 2 39 with vacuum pump 31, and vacuum detecting table 33 and valve 3 32 be installed successively on exhaust tube 2 39, opposite side is connected by 21 3 grades of outlet pipes 210 of exhaust tube 1 and structural tube, and on exhaust tube 1 mounted valve 1, described gas storage/slurry barrel 34 bottoms are provided with gas storage/slurry bucket outlet pipe 38, and on this gas storage/slurry bucket outlet pipe 38 mounted valve 2 37.
Claims (13)
1. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method, comprise the following steps: large-scale steel pipe concrete structure pipe is carried out classification from bottom to up, vacuumizing under state, begin structural tube internal classification concrete perfusion from one-level bottom, described structural tube top arranges partition panel, described partition panel is welded in structural tube, described structural tube at bottom end opening joint steel pipes at different levels as inlet pipe, described structural tube at top end opening joint steel pipes at different levels as outlet pipe, on described outlet pipe, valve is installed, also set two cover concrete pumps, to be used alternatingly, also be equipped with and vacuumize accessory system, the described accessory system that vacuumizes is that two covers vacuumize accessory system, described two the cover vacuumize accessory system wherein one the cover be connected with the outlet pipe of afterbody structural tube, another set of standby, the described accessory system that vacuumizes comprises vacuum pump, gas storage/slurry bucket, valve and exhaust tube, wherein, described gas storage/slurry bucket one side is connected by exhaust tube with vacuum pump, and vacuum detecting table and valve be installed successively on this pump-line, opposite side is connected with the afterbody outlet pipe of structural tube by exhaust tube, described gas storage/slurry bottom of the barrel is provided with outlet pipe, and on this outlet pipe mounted valve, before concrete perfusion first to injecting appropriate clear water and cement paste in structural tube, with lubricated concrete transfer pump tube,
It is characterized in that, during classification, complete every grade of concrete time of satisfied perfusion is less than or equal to the described concrete initial setting time, after lubricated concrete transfer pump tube, start concrete pump and vacuumize accessory system, concrete pump continous pouring concrete, when reaching first order structural tube outlet pipe position, concrete stops vacuumizing accessory system, and open the valve of gas storage/slurry bucket lower end, after the structural tube internal gas pressure reaches normal atmosphere (An), open first order structural tube outlet pipe valve, close after getting rid of the concrete surface layer laitance;
open second level structural tube inlet pipe valve, stop simultaneously being connected concrete pump with first order structural tube inlet pipe, close the valve on first order structural tube inlet pipe, another set of concrete pump is connected with second level structural tube inlet pipe, and start this cover concrete pump, inject appropriate clear water and cement mortar, then concrete perfusion, start and vacuumize accessory system, concrete perfusion process and vacuum are identical with the perfusion of first order structural tube, the concrete pump that will be connected with first order structural tube inlet pipe is simultaneously pulled down, and be connected with third level structural tube inlet pipe, follow-up perfusion step is identical with second level structural tube perfusion step with the first order,
After the full afterbody structural tube of filling concrete, enter storage slurry/gas bucket along exhaust pipe, after laying in enough concrete slurries in this barrel, open the outside plasma discharge of valve of gas storage/slurry barrel lower end, after the slurries quality of discharging reaches requirement, stop successively concrete pump and pumped vacuum systems, complete the perfusion of encased structures.
2. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 1, is characterized in that, described structural tube internal classification concrete perfusion refers to that the perfusion of previous stage pipe inner concrete is complete, then carries out the next stage filling concrete; Continous pouring is adopted in perfusion to any one-level pipe inner concrete.
3. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 2, is characterized in that, the vacuum in described structural tube is-and 0.060MPa～-0.100MPa.
4. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 3, is characterized in that, the vacuum in described structural tube is-and 0.070MPa～-0.090MPa.
5. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 4, is characterized in that, the vacuum in described structural tube is-and 0.075MPa～-0.086MPa.
6. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 1, is characterized in that, on each inlet pipe, flap valve is installed.
7. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 1, is characterized in that, before classification reperfusion structure pipe inner concrete, detects the tightness of respectively advancing outlet pipe, valve and structural tube.
8. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 7, it is characterized in that, described detection tightness method is: open the outlet pipe valve on the afterbody structural tube, and close all the other structural tube at different levels and advance valve on outlet pipe, structural tube is vacuumized, the vacuum of its vacuum during higher than described concrete perfusion, and can pressurize more than two minutes.
9. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 1, is characterized in that, described concrete is high-grade concrete.
10. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 9, it is characterized in that: described high-grade concrete is high performance concrete.
11. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 10 is characterized in that, adds water reducing agent, expansion agent and antishrinking agent in described high performance concrete.
12. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 11 is characterized in that described water reducing agent is the high-performance poly carboxylic acid water reducing agent.
13. large-scale steel pipe concrete structure pipe inner concrete vacuum auxiliary pouring method as claimed in claim 12 is characterized in that the slump of described high performance concrete is 180mm～240mm.
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