CN1916332A

CN1916332A - Construction method for delivering concrete through pump

Info

Publication number: CN1916332A
Application number: CN 200610115226
Authority: CN
Inventors: 李成玉; 韩可华; 付亚萍; 张银国
Original assignee: CHENGJIAN BUILDING ENGINEERING Co Ltd QINHUANGDAO CITY
Current assignee: CHENGJIAN BUILDING ENGINEERING Co Ltd QINHUANGDAO CITY
Priority date: 2006-08-10
Filing date: 2006-08-10
Publication date: 2007-02-21

Abstract

The present invention relates to a construction method for pumping concrete. Said construction method includes the following several portions: equipment for pumping concrete, conveyance and pouring concrete. It is characterized by that in the course of pouring pumped concrete the dried stone whose grain size is 15-60mm can be uniformly added into the pumped concrete, and its added quantity is less than 16% of pumped concrete weight. It can improve the pumped concrete property and can reduce construction cost.

Description

The pumping concrete construction method

Technical field

The present invention relates to concrete construction method, be specifically related to a kind of pumping concrete construction method.

Background technology

At present, along with the development of builing industry, concrete pumping is widely adopted.Pumping technology has solved the problems that concrete horizontal is long-range and vertical transport exists, and has reacted the progress of building construction technology.But pumping of concrete makes that the cobble-stone diameter of pumping of concrete is less than normal owing to will satisfy the pumpability requirement, and sand coarse aggregate ratio is bigger than normal, cementitious material increases, and causes the slump of pumping of concrete big thus, and the initial setting time is long, early strength is low, is prone to shrinkage crack, and increases concrete cost relatively.

Summary of the invention

The object of the present invention is to provide a kind of performance that can effectively improve pumping of concrete, reduce the slump, shorten the initial setting time, improve early strength, avoid shrinkage crack to take place, prolong the application life of concrete structure, reduce engineering cost simultaneously and the pumping concrete construction method of the front and back maintenance cost of being completed.

The technical scheme that realizes above-mentioned purpose is: a kind of pumping concrete construction method, comprise pumping of concrete preparation, carry and build, building in the process of pumping of concrete, by pumping of concrete weight evenly to add particle diameter below 16% be 15～60mm drystone.

The present invention builds in the process at pumping of concrete preferably that evenly to add particle diameters by 10～14% of pumping of concrete weight be 15～60mm drystone.

The present invention whenever builds thickness 100～400mm layering by pumping of concrete and evenly sheds and carry out method adding drystone that secondary vibration is buried.

The present invention adopts latter admixing method, evenly adds drystone in the process building of pumping of concrete, and the performance of pumping of concrete is improved.Its job practices utilization external force that produces of vibrating makes the mud of pumping of concrete wrap up drystone, allow drystone fully absorb peripheral moisture, thereby reduce the concrete slump at short notice significantly, shorten the initial setting time, improve concrete early strength, avoid shrinkage crack to take place.Simultaneously, increased concrete density, improved concretely, reduced the concrete in mass heat of hydration, dwindled the inside and outside temperature difference of concrete, thereby effectively avoided the surface and the internal fissure of concrete in mass from waterproof effect owing to mixed stone outward.

The present invention is owing to improved concrete early strength, make striking time corresponding in advance, shortened the construction period, and, saved certain pumping of concrete accordingly, thereby effectively improved concrete engineering construction efficient owing to mixed a certain proportion of stone, reduced engineering cost, owing to avoided the generation in concrete shrinkage crack, saved a large amount of maintenance costs simultaneously, made the every m of concrete pouring synthetic cost ³Reduced more than 10%.By the whole nation building operations first half of the year in 2006 area 26.3 hundred million m ²Calculate, adopt job practices of the present invention, can save nearly 60,000,000,000 yuan of engineering construction cost in 1 year.

Comparative test result of the present invention is as follows:

The design of concrete standard is according to JGJ/T10-95 " concrete pumping construction technology rules ".

The mix performance test is carried out according to GB/T50080-2002 " ordinary concrete mix method for testing performance standard ".

Compressive strength test is carried out according to GB/T50081-2002 " standard for test methods of mechanical properties of ordinary concrete ".

Mix performance and pumping of concrete saving amount (process of building adds stone and the contrast that does not add stone) see Table 1.

Table 1

C25	85	52	9.1
C25	85	52	9.1	C30	80	54	8.8
C35	98	44	9.3	C30	80	54	8.8
C35	98	44	9.3	14％ C20	67	58	13.4
C25	88	58	10.6	14％ C20	67	58	13.4
C25	88	58	10.6	C30	83	59	11.3
C35	120	56	9.8	C30	83	59	11.3
C35	120	56	9.8	16％ C20	79	58	13.4
C25	102	88	12.2	16％ C20	79	58	13.4
C25	102	88	12.2	C30	85	103	11.5
C35	122	76	10.2	C30	85	103	11.5

Compressive strength rate (process of building adds stone and the contrast that does not add stone) sees Table 2

Table 2

C30	109	106	103	101
C30	109	106	103	101	C35	113	107	110	108
16％ C20	118	95	95	100	C35	113	107	110	108
16％ C20	118	95	95	100	C25	113	107	86	91
C30	102	90	104	102	C25	113	107	86	91
C30	102	90	104	102	C35	122	108	98	94

The specific embodiment

Embodiment one

Building, residential quarters basement floor concrete is built engineering, and engineering concrete ground thickness of slab 1.5m is designed to the C35S8 water-tight concrete, the amount of building 2300m ³, belong to casting of concrete in mass.

Concrete job practices:

1, provide pumping of concrete on request by ready mix concrete company, the cobble-stone diameter maximum is no more than 31.5mm in the concrete, and the slump is controlled at 15cm ± 2cm.

2, preparing particle diameter by 10% of pumping of concrete weight in the job site is drystone of 40～60mm.

3, the pumping of concrete for preparing is delivered to the pouring area through delivery pump, at first build the pumping of concrete of one deck 400mm thickness, behind the vibrating spear vibration compacting, to shed uniformly in the concrete surface of having built by drystone of building pumping of concrete weight 10%, vibrate once more to drystone with vibrating spear and all to be buried by concrete, whenever build 400mm thickness pumping of concrete afterwards and evenly shed drystone with respect to a preceding concreting weight 10%, and same drystone that mixes that makes through vibrating mixes with concrete in concrete surface.

4, after concreting is finished by designing requirement, carry out conventional concrete covering curing.

Embodiment two

Brick mix structure office building concrete roof is built, the long 58m of every layer of top board of engineering, wide 16m, floorslab concrete thickness 120mm, concreting amount 112m ³, adopt C20 ready mix concrete.

Concrete job practices:

1, provide pumping of concrete on request by ready mix concrete company, the cobble-stone diameter maximum is no more than 31.5mm in the pumping of concrete, and the slump is controlled at 15cm ± 2cm.

2, preparing particle diameter by 14% of pumping of concrete gross weight at the construction field (site) is drystone of 15～40mm.

3, the pumping of concrete that will prepare on request is delivered to the pouring area, on the plate face, build earlier the pumping of concrete of 100mm thickness, adopt vibrating spear and vibration board to vibrate, drystone of preparation is shed the pumping of concrete surface of building uniformly, carry out secondary vibration with vibration board again, make drystone of adding all buried, build to the top plate thickness of design with pumping of concrete afterwards.

4, after concreting is finished by design, carry out conventional concrete covering curing.

Claims

1, a kind of pumping concrete construction method, comprise pumping of concrete preparation, carry and build, it is characterized in that: building in the process of pumping of concrete, by pumping of concrete weight evenly to add particle diameter below 16% be drystone of 15～60mm.

2, pumping concrete construction method according to claim 1 is characterized in that: drystone of adding is for pressing 10～14% of pumping of concrete weight.

3, pumping concrete construction method according to claim 1 is characterized in that: described drystone is whenever to build thickness 100～400mm layering by pumping of concrete evenly to shed and carry out secondary vibration and bury and add.