CN102644377B - Pumping unequal-strength concrete beam column joint construction method - Google Patents
Pumping unequal-strength concrete beam column joint construction method Download PDFInfo
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- CN102644377B CN102644377B CN201210094411.2A CN201210094411A CN102644377B CN 102644377 B CN102644377 B CN 102644377B CN 201210094411 A CN201210094411 A CN 201210094411A CN 102644377 B CN102644377 B CN 102644377B
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Abstract
The invention relates to a concrete construction method, in particular to a pumping unequal-strength concrete beam column joint construction method. According to the construction method, concrete pumping and pouring equipment, concrete vacuum dehydration equipment and a dehydration box are used. The method comprises the following specific steps of: designing a mixing proportion according to the concrete strength requirements of a beam and a plate and performing concrete stirring; and feeding concrete to a working surface by using a concrete pump, putting into the dehydration box, performing vacuum-pumping dehydration on concrete by using the concrete vacuum dehydration equipment, pouring dehydrated concrete onto column and wall positions after a dehydration requirement is met, and pouring non-dehydrated concrete into beam and plate positions a certain period later. A set of concrete conveying equipment is adopted, so that great convenience is brought to construction, the enterprise construction cost is reduced, and construction organization of construction enterprises is facilitated.
Description
Technical field
The present invention relates to a kind of concrete construction method, specifically relate to a kind of pumping unequal strength concrete beam-column node construction method.
Background technology
In cast-in-situ concrete construction work, due to the result of Load Combination and internal force calculating, require vertical structure (post, the wall) strength grade of concrete of same layer higher than the strength grade of concrete of horizontal structure (beam, plate), the current the Concrete Structure Design principle of China is strong column and weak beam, so that the destruction of opposing earthquake disaster.General control post, wall concrete strength are than beam, the high lOMPa of board concrete intensity.Owing to will build at same height the concrete of two kinds of intensity simultaneously, there are two cover concrete conveying equipments at requirement scene, and supplies the concrete of two kinds of intensity simultaneously, brings larger difficulty and inconvenient to construction.
Summary of the invention
The technical issues that need to address of the present invention are, overcome the deficiency of background technology, and a kind of simple to operate, lower-cost pumping unequal strength concrete beam-column node construction method is provided.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of pumping unequal strength concrete beam-column node construction method, comprises that concrete pumping builds equipment, concrete vacuum dehydration equipment and dewatering box.Require design mixture proportion according to the concrete strength of beam, plate, carry out concrete-agitating.Adopt a concrete pump that concrete is delivered to work plane, put dewatering box into, adopt concrete vacuum dehydration equipment to vacuumize dehydration to the concrete in dewatering box, reach after dehydration requirement, by dehydration after the reinforcement of concrete in being poured into post, wall position, through after a period of time, then with not dehydration concreting beam, board position.
Described a period of time is for being no more than 1 hour.
The vacuum cup shape of dewatering box and concrete vacuum dehydration equipment, area match.
This kind of pumping unequal strength concrete beam-column node construction method feasible according to being:
1. the relation of the concrete slump and water supply volume:
The concrete slump and water/binder ratio have direct relation, the water supply volume of wet concrete that " design of common concrete proportioning code " JGJ 55-2000 provides and the relation of the slump (in table 1), water/binder ratio is in the time of 0.40～0.80 scope, according to the concrete mix denseness of the kind of coarse aggregate, particle diameter and construction requirement, its water supply volume can be chosen by table 1.As seen from the table, water supply volume increases by 20 kg/m
3, the slump increases by 10 mm.While adopting pumping of concrete, slump general control is at 200 mm, and the slump that concrete pouring construction requires is between 55～70.
The water supply volume of table 1 wet concrete is selected table (kg/m
3)
2. the relation of concrete strength and water/binder ratio
In the time that strength grade of concrete is less than C60 level, " design of common concrete proportioning code " concrete strength that JGJ 55-2000 provides and the relation of water/binder ratio are as follows:
（1）
In formula:
α a α b---regression coefficient, in table 2;
f cu, 0---concrete strength (MPa);
f ce---cement 28d compressive strength measured value (MPa);
w/c---water/binder ratio.
Table 2 regression coefficient is selected table
| Rubble | |
| α a | 0.46 |
| α b | 0.07 |
Due to
α a.
α b.
f cevery little, the relation of solidifying native intensity and water/binder ratio can be reduced to:
f cu,0=
α a·
f ce·C/W （2）
From formula (2), after cement type is selected, concrete strength is directly proportional to cement water ratio (inverse of water/binder ratio).
Design of concrete step:
1. require to determine basic water supply volume according to concrete slump;
2. want sum formula (2) to determine water/binder ratio according to concrete strength;
3. determine cement consumption by water/binder ratio.
4. examination is joined, and adjusts match ratio and makes the actual concrete strength finally obtaining higher than design concrete strength 5% left and right, is actual production concrete mix.
Example 1: with the Portland cement preparation C30 concrete of P42.5, concrete slump 200mm while requiring pumping.Calculated by table 1, water supply volume should be 300 kg/m
3, after adopting high efficiency water reducing agent, can reduce water supply volume 30%, draw thus table 3 corresponding data.
Table 3 C30 concrete parameters
From calculating above: when by slump 200mm requirement C30 concrete, be pumped into after work plane, through vacuum dehydration, water supply volume dropped to 159 kg/m
3(be equivalent to the 49g/m that dewaters
3), concrete strength can be brought up to 43.0 MPa, approximately improves concrete strength 10MPa left and right.When water supply volume drops to 159 kg/m
3time, concrete slump is 80mm, concrete pouring construction is feasible.
Example 2: with the Portland cement preparation C35 concrete of P42.5, concrete slump 200mm while requiring pumping.Calculated by table 1, water supply volume should 260 kg/m
3, after adopting high efficiency water reducing agent, can reduce water supply volume 20%, draw thus table 4 corresponding data.
Table 4 C35 concrete parameters
From calculating above: when by slump 200mm requirement C35 concrete, be pumped into after work plane, through vacuum dehydration, water supply volume dropped to 160 kg/m
3(48g/m quite dewaters
3), concrete strength can be brought up to 48.9 MPa, approximately improves concrete strength 11.4MPa left and right.When water supply volume drops to 160 kg/m
3time, concrete slump is 80mm, concrete pouring construction is feasible.
Example 3: with the Portland cement preparation C40 concrete of P42.5, concrete slump 200mm while requiring pumping.Calculated by table 1, water supply volume should 300 kg/m
3, after adopting high efficiency water reducing agent, can reduce water supply volume 30%, draw thus table 5 corresponding data.
Table 5 C40 concrete parameters
From calculating above: when by slump 200mm requirement C40 concrete, be pumped into after work plane, through vacuum dehydration, water supply volume dropped to 164 kg/m
3(be equivalent to the 48g/m that dewaters
3), concrete strength can be brought up to 54.8 MPa, approximately improves concrete strength 12MPa left and right.When water supply volume drops to 164kg/m
3time, concrete slump is 80mm, concrete pouring construction is feasible.
From above-mentioned 3 examples, when in the different situation of concrete beam and column node design strength, use vacuum dehydration to change concrete water/binder ratio, improve concrete strength 10MPa left and right, can accomplish, as can be seen here, using vacuum dehydration to realize concrete strength adjustment is to solve the concrete that adopts a kind of intensity, and a set of concrete conveying equipment is realized the feasible construction method of building of unequal strength concrete beam, post node.
Good effect of the present invention:
1. this kind of pumping unequal strength concrete beam-column node construction method prior art of comparing, has reduced a set of concrete conveying equipment, has reduced construction cost, brings great convenience to construction, is conducive to the organizing construction of construction enterprises.
2. this kind of pumping unequal strength concrete beam-column node construction method built post at needs, the concrete position of wall concrete vacuum dehydration equipment dewaters concrete, concrete water/binder ratio is reduced, thereby after making concrete setting, intensity improves, this kind of method utilizes vacuum dewatering apparatus to complete the raising of concrete strength, easy to operation, save strong concrete, accelerated construction period.
3. this kind of pumping unequal strength concrete beam-column node construction method carried out the principle of building of " first high rear low ", first build strong concrete, after-pouring low strength concrete, be strict controlled in post, the front casting beams of wall position concrete initial set, board position, can effectively prevent that crack from appearring in bean column node place, bean column node place perception, quality are better.
Detailed description of the invention
Embodiment mono-: a kind of pumping unequal strength concrete beam-column node construction method, adopt a set of concrete conveying equipment, to deliver to concreting work plane by the concrete of slump 200mm requirement C30, put dewatering box into, adopt concrete vacuum dehydration equipment that the concrete of putting into dewatering box is vacuumized to dehydration, water supply volume is dropped to 159 kg/m
3(be equivalent to the 49g/m that dewaters
3), concrete strength can be brought up to 43.0 MPa, approximately improves concrete strength 10MPa left and right, the concrete after dehydration is used for building post, wall position, then is concreting beam, the board position of 32.0 MPa by intensity.Post, wall position and beam, concrete interval of building, board position are no more than 1 hour.
Embodiment bis-: basic identical with embodiment mono-, difference is: will deliver to concreting work plane by the concrete of slump 200mm requirement C35, put dewatering box into, adopt concrete vacuum dehydration equipment that the concrete of putting into dewatering box is vacuumized to dehydration, water supply volume is dropped to 160 kg/m
3(be equivalent to the 48g/m that dewaters
3), concrete strength can be brought up to 48.9 MPa, approximately improves concrete strength 11.4 MPa left and right, the concrete after dehydration is used for building the concrete at post, wall position, then is concreting beam, the board position of 37.5 MPa by intensity.
Embodiment tri-: basic identical with embodiment mono-, difference is: will deliver to concreting work plane by the concrete of slump 200mm requirement C40, put dewatering box into, adopt concrete vacuum dehydration equipment that the concrete of putting into dewatering box is vacuumized to dehydration, water supply volume is dropped to 164 kg/m
3(be equivalent to the 48g/m that dewaters
3), concrete strength can be brought up to 54.8 MPa, approximately improves concrete strength 12.4 MPa left and right, the concrete after dehydration is used for building the concrete at post, wall position, then is concreting beam, the board position of 42.4 MPa by intensity.
Claims (3)
1. a pumping unequal strength concrete beam-column node construction method, comprise that concrete pumping builds equipment, concrete vacuum dehydration equipment and dewatering box, it is characterized in that: according to beam, the concrete strength of plate requires design mixture proportion, carry out concrete-agitating, adopt a concrete pump that concrete is delivered to work plane, put dewatering box into, adopt concrete vacuum dehydration equipment to vacuumize dehydration to the concrete of putting into dewatering box, reach after dehydration requirement, by dehydration after the reinforcement of concrete in being poured into post, wall position, through after a period of time, again with the concreting beam not dewatering, board position.
2. pumping unequal strength concrete beam-column node construction method according to claim 1, is characterized in that: described a period of time is for being no more than 1 hour.
3. pumping unequal strength concrete beam-column node construction method according to claim 1, is characterized in that: the vacuum cup shape of dewatering box and vacuum dewatering apparatus, area match.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0393967A (en) * | 1989-09-05 | 1991-04-18 | Taisei Corp | Construction method for vacuum dehydrating concrete |
| JPH04309663A (en) * | 1991-04-04 | 1992-11-02 | Asanumagumi:Kk | Method for placing concrete |
| CN101619558A (en) * | 2009-07-28 | 2010-01-06 | 朱奎 | Air entraining vacuum concrete roadway and constructing method thereof |
-
2012
- 2012-04-01 CN CN201210094411.2A patent/CN102644377B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0393967A (en) * | 1989-09-05 | 1991-04-18 | Taisei Corp | Construction method for vacuum dehydrating concrete |
| JPH04309663A (en) * | 1991-04-04 | 1992-11-02 | Asanumagumi:Kk | Method for placing concrete |
| CN101619558A (en) * | 2009-07-28 | 2010-01-06 | 朱奎 | Air entraining vacuum concrete roadway and constructing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 缪昌文，薛建新.垂直面真空脱水技术在现浇混凝土梁、柱施工中的应用.《建筑技术》.1993,第20卷(第4期),227-220. * |
| 赵志缙,赵帆.混凝土的泵送与浇筑.《混凝土泵送施工技术》.中国建筑工业出版社,1998,188-197. * |
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