CN1978843A - Construction method for reinforcing steel-bar net mortar thin layer - Google Patents

Abstract

The invention discloses mat reinforcement mortar thin layer reinforcing construction method. It includes the following steps: component surface treatment; component surface inserting shear pin; laying mat reinforcement and fixing; coating mortar on the mat reinforcement and the component surface. The mat reinforcement and the shear pin are fixed to enhance the shear resistant between the mortar thin layer and the original component, accordingly increase structural member rigidity, tensile, compression resistant, bending resistant and shearing strength.

Description

The job practices of reinforcing steel-bar net mortar thin layer

Technical field:

The present invention relates to the realm of building construction, specifically refer to a kind of job practices of reinforcing steel-bar net mortar thin layer.

Background technology:

A large amount of old industry and civilian construction and bridge construction are demanded reinforcing and repairing urgently.In addition, newly-built structure is because the generation of variation, natural calamity and the contingent of design or construction error, service condition change and environment for use etc. are former thereby have defective and potential safety hazard, and these ill structures all need to carry out strengthening reconstruction.Existing direct reinforcing technique and method mainly contain increasing section reinforcing method, external prestressing strengthening method, affixing steel plate (muscle) reinforcing method, paste carbon fiber reinforcement method etc.These methods all have advantage and strong point separately, but also exist many deficiencies, as: the increasing section method makes that scantling increases, weight increases the weight of; Reinforcement by sticking of sheets and stickup carbon fiber reinforcement method adopt organic structure glue, poor, the contaminated environment of resistance to elevated temperatures.So with inorganic material is that main steel mesh reinforcement mortar thin layer reinforcement means becomes in recent years the focus of research both at home and abroad.Done the experimental study of some ferro-cement reinforced concrete beams abroad since the eighties from eighties of last century, as Logan D.and Shah S.P.Moment Capacity andCracking Behaviour of Ferrocement in Flexure[J] .Joumal of the American ConcreteInstitute, 1973,70 (12): 799-804, but the greatest drawback that ferro-cement is reinforced is and former member between adhesive property bad, even composite mortar can not reach and former member between reliable bonding.On the interface, occur easily shearing stripping damage, make back-up coat can not with former member co-operation well.

Summary of the invention:

The object of the present invention is to provide a kind of mortar to reach and former member between reliable bonding, on the interface, be not easy occur to shear stripping damage, make back-up coat can with the job practices of the fine cooperative reinforcing steel-bar net mortar thin layer of former member.

The object of the present invention is achieved like this, the job practices of this reinforcing steel-bar net mortar thin layer comprises the steps:

(1) component surface is handled: with physics and chemical method component surface is handled, remove the component surface grease, make component surface formation roughness at random, increase the surface area of adherend, improve adhesion stress, blow dust and particle off with cleaning compressed air again;

(2) component surface is implanted shear pin: in former component surface boring, behind the pore-forming dust in the hole is cleaned out earlier, with inorganic material or organic material pin is implanted in the hole, treat its curing;

(3) shop steel mesh reinforcement and fixing: the reinforced mesh that will make in advance is taped against component surface, and steel mesh reinforcement and shear pin are fixed;

(4) on steel mesh reinforcement and former component surface, smear or spray screed, to guarantee that newly smearing screed closely contacts with the old concrete surface;

(5) wet water curing mortar, and prevent freezing.

Owing to implant shear pin in component surface, the reinforced mesh of making in advance is taped against component surface, and steel mesh reinforcement and shear pin fixed, strengthened shear behavior between steel mesh reinforcement mortar thin layer and the former member, make back-up coat can with former member co-operation well, on the interface, be not easy to occur shearing stripping damage.Its essence is a kind of external prestressing tendon, improves the quantity of reinforcement of former member, thus the rigidity of corresponding raising structural element, tension, resistance to compression, bending resistance and shear strength.

The present invention is further detailed explanation below in conjunction with drawings and Examples.

Description of drawings:

Fig. 1 concrete single face steel mesh reinforcement mortar thin layer structural representation

The two-sided steel mesh reinforcement mortar thin layer of Fig. 2 concrete structural representation

Fig. 3 steel mesh reinforcement and shear pin be the Facad structure schematic diagram fixedly

The different configuration structure schematic diagrames of Fig. 4 shear pin

The specific embodiment:

With reference to figure 1, Fig. 2, Fig. 3, Fig. 4, the job practices of this reinforcing steel-bar net mortar thin layer comprises the steps:

(1) component surface is handled: with physics and chemical method component surface is handled, available nonmetal sand such as river sand, silica sand, carborundum or the sandblast of alumina dry method are blown down, or brush surperficial grease with the sticking high-duty detergent of scrub-brush; Borrow manpower or the Mechanics Performance of Adherence of New face is beaten formation roughness at random, the surface area of increase adherend, raising adhesion stress with machinery with iron hammer and chisel; Blow dust and particle off with cleaning compressed air again;

(2) component surface is implanted shear pin: earlier at former member 1 surface drilling 5, aperture 5 is generally greater than pin 4,6,7 about 2～3mm, and hole depth is determined by designing and calculating; Behind the pore-forming dust in the hole is cleaned out; With inorganic material (as microdilatancy high-strength cement bar planting glue) or organic material (as epoxy resin bar planting glue) pin 4,6,7 is implanted in the hole, treated its curing;

(3) shop steel mesh reinforcement and fixing: the reinforced mesh 3 that will make in advance is taped against member 1 surface, and steel mesh reinforcement 3 and shear pin 4,6,7 fixed, fixing method is welding or steel mesh reinforcement 3 placed in shear pin 4,6, the 7 end hooks uses the thin wire colligation;

(4) can be at former component surface brushing interface adhesive: interface adhesive be anyly can strengthen the inorganic of cohesion between screed and the former member or slurries that organic material is made, adds the cohesion between strength mortar and the former member 1,

(5) plus-pressure is at steel mesh reinforcement and former component surface trowelling sand or spray screed: the power of the about 250N of each spatula, and spatula area 250 * 100mm) is to guarantee that newly smearing screed 2 contacts with the tight of old concrete surface;

(6) wet water curing mortar, and prevent freezing.

Step (4) also can be saved, and is feasible equally, and (4) in steps, better effects if, above method can carry out to component surface that single face, two reinforcings, three are reinforced or the four sides reinforces etc. according to different situations; Wide application can be widely used in various structure typess, as building, structure, bridge, tunnel, culvert etc.; Various planforms are as rectangle, circle, curved-surface structure etc.; The reinforcing and repairing of various structure position Ru Liang, plate, post, node, arch, shell etc.

Claims (1)

1, the job practices of reinforcing steel-bar net mortar thin layer is characterized in that: comprise the steps:

(1) component surface is handled: with physics and chemical method component surface is handled, remove the component surface grease, make component surface formation roughness at random, increase the surface area of adherend, improve adhesion stress, blow dust and particle off with cleaning compressed air again;

(2) component surface is implanted shear pin: in former component surface boring, behind the pore-forming dust in the hole is cleaned out earlier, with inorganic material or organic material pin is implanted in the hole, treat its curing;

(3) shop steel mesh reinforcement and fixing: the reinforced mesh that will make in advance is taped against component surface, and steel mesh reinforcement and shear pin are fixed;

(4) on steel mesh reinforcement and former component surface, smear or spray screed, to guarantee that newly smearing screed closely contacts with the old concrete surface;

(5) wet water curing mortar, and prevent freezing.

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