CN101745981A

CN101745981A - Anchor sealing method of prestressed anchor recess

Info

Publication number: CN101745981A
Application number: CN201010101354A
Authority: CN
Inventors: 中岛秀夫
Original assignee: 王丹
Priority date: 2010-01-26
Filing date: 2010-01-26
Publication date: 2010-06-23

Abstract

The invention relates to an anchor sealing method of a prestressed anchor recess, belonging to the technical field of architecture. The method adopts the following steps: (1) cleaning the anchor recess after the tension of an orbital plate; (2) infusing hot-melt modified sulfur mortar into the anchor recess to cause the hot-melt modified sulfur mortar to be level with the side surface of the orbital plate at the opening of the anchor recess; or pre-casting concrete to 1/3-1/2 of volume of the anchor recess, and then infusing the modified sulfur mortar to be level with the side surface of the orbital plate at the opening of the anchor recess. The modified sulfur has higher compressive strength, the hot-melted mortar is firmly bonded with the concrete of the inner surface of the anchor recess, the structure is compact without cracks and can not crack and shrink after cooling, and the modified sulfur also has the characteristics of good performances of impermeability, frost resistance and corrosion resistance. Steel bars are compactly sealed in a space isolated with air by the modified sulfur and can not generate any corrosion. The method just needs one-time construction and does not need specific conservation and anti-corrosion treatment, so the method is very simple and reliable.

Description

A kind of anchor sealing method of prestressed anchor recess

Technical field

The present invention relates to technical field of buildings, particularly relate to the anchor sealing method of prestressed anchor recess in a kind of building element.

Background technology

In recent years, the development of high-speed railway was advanced by leaps and bounds, and the century-old quality in construction then becomes major subjects.Each link in the whole railway construction is all being pursued high quality and low cost and reliable and stable.Because pre-stress rail plate hight load long-time bearing track is had higher requirement to its total quality.Thereby it is also more and more higher for the requirement of the grouting vocal imitation skill on track slab prestress anchor recess sealing off and covering anchorage and the track plate.For track slab prestress anchor recess sealing off and covering anchorage technology is current a lot of technological inventions arranged, for example the technology of CN1836867A advocates to use the C40 concrete to carry out the sealing off and covering anchorage operation.But the inventor thinks that concrete sealing off and covering anchorage technology has very big hidden danger, and its shortcoming is that the concrete sealing off and covering anchorage needs special maintenances, also causes dehydration easily if maintenance is improper, crackle occurs, and easily shrinks; And need cut a hole a mao operation in anchor recess, concrete does not have etch-proof function, also needs to use anticorrosive paint in addition, but also will put plastic sheath at stretch-draw end ground tackle.This construction method had both caused the crackle of track plate to enlarge easily, thereby caused the reduction of intensity to increase the link of constructing again easily.

Summary of the invention

At the deficiency in the above-mentioned field, the invention provides a kind of anchor sealing method of prestressed anchor recess, its material is easy to get, and method technology is simple, and one-shot forming need not be done preservative treatment in addition.

A kind of anchor sealing method of prestressed anchor recess adopts following steps: clean out anchor recess after the tension of (1) track plate; (2) in anchor recess, inject the modified sulfur mortar of hot melt to flushing with the track plate side at anchor recess mouth place; Or placing concrete pours into the modified sulfur mortar to flushing with the track plate side at anchor recess mouth place again to 1/3-1/2 anchor recess volume in advance; Described modified sulfur mortar employing modified sulfur and inoganic solids powder are formulated, and its weight ratio is 1: 0-0.9.

Described modified sulfur makes with following method: A, sulphur heating fusion back is mixed with modifier, and continue to be heated to 120～200 ℃; Generate modified sulfur, the weight of described modifier is the 2%-40% of sulphur weight, described modifier be in the following material one or more: aromatic hydrocarbons, diolefins hydrocarbon, olefines hydrocarbon.

Described modifier is styrene, adjacent, or the contraposition methyl styrene, 2,3-dihydroindene, dicyclopentadiene or cinene.

The weight ratio of preferred described modified sulfur and inoganic solids powder is 1: 0.3-0.9, more preferably 1: 0.5-0.8.

The weight of preferred modifier is the 3%-30% of sulphur weight.

Described sulphur refers to crude sulfur, the sulphur of petroleum refinement or selexol process.

Described inoganic solids powder is flyash or slag or quartz sand or rubble or building waste pulverizing slag, and the fineness of inoganic solids powder is 30 orders-300 orders.

The inventive method is with the mixture of modified sulfur or modified sulfur and the inoganic solids powder material as the sealing off and covering anchorage cave, sulphur is obtained being a kind of cancellated self-aggregate after high temperature modified, has high compression strength, and the mortar behind the hot melt and anchor recess inner surface concrete binding are firm, structure is closely knit, there is not crackle, can not ftracture after the cooling, do not produce contraction, experimental results show that after mortar hot melt of the present invention injects anchor recess to reach the above high strength of 60Pa after 2 hours, in addition, modified sulfur has impervious, freeze proof, the characteristics that corrosion resistance is good, reinforcing bar be modified sulphur closely knit be enclosed in one with the isolated space of air in, do not produce any action of rust, this method is once constructed and is got final product, and need not do special maintenance and preservative treatment, very simple, reliable.The interpolation of inoganic solids powder is in order further to improve the intensity of mortar, makes in the anchor recess of cooling after coagulation more closely knitly, does not have the cavity, rationally utilizes industrial waste simultaneously, reaches the effect of environmental protection construction.

The specific embodiment

The present invention is described in further detail in conjunction with the embodiments now.

Embodiment 1

A, with the reaction of mineral crystal sulphur S8 and modifier, modification becomes is with cancellated macromolecule modified sulphur

Concrete grammar is for to mix with modifier after sulphur being heated to 120 ℃ of-150 ℃ of fusings, and lasting heating generates modified sulfur.Sulphur stability is strong after the modification, and the cohesive force height has been formed the solid thick shell of one deck, and is impervious, freeze proof, anticorrosive.

Modifier can be aromatic hydrocarbons, styrene for example, methyl styrene etc., also can be diene (genus) hydrocarbon or olefines hydrocarbon, for example: 2,3-dihydroindene, dicyclopentadiene, cinene, modifier can be one or more the combinations in the above-claimed cpd.The weight of modifier be sulphur weight 5%.

Be injected in the anchor recess of cleaning out after B, the modified sulfur fusing that steps A is obtained, slurry is irritated to flushing with the track plate side at anchor recess mouth place.

Embodiment 2

A, with embodiment 1 in the steps A difference be that sulphur adopts the sulphur of petroleum refinement or selexol process, the weight of modifier be sulphur weight 40%, mix and continue heating obtaining modified sulfur after modifying process need be heated to 160 ℃ with crude sulfur with modifier.Sneak into the inoganic solids powder then in the modified sulfur that obtains, the inoganic solids powder is selected flyash for use, also can select slag or quartz sand or building waste etc. for use, and main purpose is to increase the intensity of modified sulfur.The weight of inoganic solids powder is 50% of modified sulfur, and the fineness of inoganic solids powder is 50 orders.

Pour in the anchor recess behind the mixture hot melt of B, the modified sulfur that steps A is obtained and inoganic solids powder, embodiment 1 is seen in all the other operations.

Embodiment 3

A, with the steps A difference of embodiment 2 be the weight of modifier be sulphur weight 10%, sulphur heat fused temperature is 200 ℃; The weight of inoganic solids powder is 30% of modified sulfur weight, and the fineness of inoganic solids powder is 300 orders.

Embodiment 2 is seen in B, operation.

Embodiment 4

A, with the steps A difference of embodiment 2 be the weight of modifier be sulphur weight 30%; The weight of inoganic solids powder is 70% of modified sulfur weight, and the fineness of inoganic solids powder is 80 orders.

Embodiment 2 is seen in B, operation

Experimental example

1, acidproof, salt tolerant experiment

According to national building material industry standard JC/T984-2005,8 of the test blocks of 10 * 10 * 10cm have been manufactured by the construction of the foregoing description batching, wherein after soaking 90 days in the hydrochloric acid of pH1, do compressive strength test for 4, in addition 4 are soaked after 90 days in 3% NaCl solution and do compressive strength test, illustrate that its acidproof salt tolerant is effective.

Test block (10cm * 10cm * 10cm) Experimental condition (90d) Compression strength MPa/mm ²) Embodiment 1 PH1 hydrochloric acid ??65.7 Embodiment 2 PH1 hydrochloric acid ??66.8 Embodiment 3 PH1 hydrochloric acid ??63.2 Embodiment 4 PH1 hydrochloric acid ??64.0 Embodiment 1 3%NaCl solution ??64.5 Embodiment 2 3%NaCl solution ??670. Embodiment 3 3%NaCl solution ??60.1 Embodiment 4 3%NaCl solution ??65.1

2, impermeability test

According to national building material industry standard JC/T984-2005 the sealing off and covering anchorage material in the inventive method has been done impermeability test, material by embodiment 1,2,3 sprays 6.3cm on concrete, 6.4cm, 6.5cm test after the thick moulding, impervious pressure reaches 2.5MPa, sealing off and covering anchorage material of the present invention does not have the infiltration phenomenon, proves that the sealing off and covering anchorage material in the inventive method has good impervious effect, no matter illustrates underground or on the ground can the corrosion resistance corroded by liquid.

3, shrinkage test

According to national building material industry standard JC/T984-2005 the sealing off and covering anchorage in the inventive method has been done shrinkage test, it is 0.05% that shrinkage factor all is lower than.The sealing off and covering anchorage of proof in the inventive method can with the concrete secure bond, low-shrinkage can not cause the be full of cracks of anchor recess, distending.

4, chloride permeability rate test

Detection method: electromigration (RCM)

Operative norm: the CCES 01-2004 of China Civil Engineering Society

This method is with reference to the experimental principle of chloride diffusion coefficient experimental technique NT Build 492, come the ability of quantitative assessment concrete resisting chloride ion penetration diffusion, for the design of the concrete structure durability in the chlorion erosion environment and the assessment and the prediction in service life provide basic parameter.

Experimental technique: cross sample and axially applying outside electromotive force, force the chlorion of negative pole in sample, to move., after the regular hour, sample is rived vertically in experiment, on the test specimen surface of riving, spray 0.1mol/L AgNO3 solution immediately, can after about 15 minutes, observe white silver nitrate precipitation.If at the test specimen surface spraying colored indicator of riving, the dried slightly back spray in surface 0.1mol/LAgNO3 solution.About about one day of the test specimen of spray AgNO3 solution, the part of chloride ion-containing will become pansy.Measure colour developing degree of depth substitution computing formula, promptly obtain the concrete chloride ion diffusion coefficient.

Testing procedure

1. the sealing off and covering anchorage material among the embodiment 4 is made test specimen, cutting into diameter is that 100mm, thickness are the cylinder sample of 50 ± 2mm;

2. sample is cleaned in ultra sonic bath;

3. the sample after will cleaning is installed on the specimen holder, injects test solution, connects Test Host;

4. open RCM-D chloride diffusion coefficient analyzer main frame and carry out the electromigration experiment;

5. the sample after the electromigration is rived vertically, on the surface of riving, spray liquor argenti nitratis ophthalmicus;

6. measure the sediment colour developing degree of depth, data are imported evaluation software draw evaluation result.

Evaluation result: chloride diffusion coefficient is 0, illustrates that the sealing off and covering anchorage material chloride-penetration resistance power among the present invention is very strong, and its permeability is 0.

Claims

1. an anchor sealing method of prestressed anchor recess adopts following steps: clean out anchor recess after the tension of (1) track plate; (2) in anchor recess, inject the modified sulfur mortar of hot melt to flushing with the track plate side at anchor recess mouth place; Or placing concrete pours into the modified sulfur mortar to flushing with the track plate side at anchor recess mouth place again to 1/3-1/2 anchor recess volume in advance; Described modified sulfur mortar employing modified sulfur and inoganic solids powder are formulated, and its weight ratio is 1: 0-0.9.

2. sealing off and covering anchorage method according to claim 1, described modified sulfur makes with following method: A, sulphur heating fusion back is mixed with modifier, and continue to be heated to 120～200 ℃; Generate modified sulfur, the weight of described modifier is the 2%-40% of sulphur weight, described modifier be in the following material one or more: aromatic hydrocarbons, diolefins hydrocarbon, olefines hydrocarbon.

3. sealing off and covering anchorage method according to claim 2, described modifier are styrene, adjacent, or the contraposition methyl styrene, 2,3-dihydroindene, dicyclopentadiene or cinene.

4. sealing off and covering anchorage method according to claim 2, the weight of described modifier are the 3%-30% of sulphur weight.

5. sealing off and covering anchorage method according to claim 2, described sulphur refers to crude sulfur, the sulphur of petroleum refinement or selexol process.

6. sealing off and covering anchorage method according to claim 1, the weight ratio of described modified sulfur and inoganic solids powder is 1: 0.3-0.9.

7. sealing off and covering anchorage method according to claim 6, the weight ratio of described modified sulfur and inoganic solids powder is 1: 0.5-0.8.

8. sealing off and covering anchorage method according to claim 1, described inoganic solids powder are flyash or slag or quartz sand or rubble or building waste pulverizing slag, and the fineness of inoganic solids powder is 30 orders-300 orders.