CN203443724U - Thin-wall concrete structure multi-strand flat anchor pre-stress measuring system - Google Patents

Thin-wall concrete structure multi-strand flat anchor pre-stress measuring system Download PDF

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Publication number
CN203443724U
CN203443724U CN201320541646.1U CN201320541646U CN203443724U CN 203443724 U CN203443724 U CN 203443724U CN 201320541646 U CN201320541646 U CN 201320541646U CN 203443724 U CN203443724 U CN 203443724U
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anchor
dynamometer
hollow
thin
concrete
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CN201320541646.1U
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朱太山
贾少燕
程德虎
赵廷华
冯光伟
水淼
赵海涛
张玉明
陈晓光
王彩玲
申鲁
高英
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Henan Water & Power Consulting Engineering Co Ltd
Hohai University HHU
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Henan Water & Power Consulting Engineering Co Ltd
Hohai University HHU
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Abstract

The utility model discloses a thin-wall concrete structure multi-strand flat anchor pre-stress measuring system. A thin-wall concrete structure is a structure with a minimum cross section size less than 50 cm. One anchor cable at least comprises three pre-stress steel strands. The measuring system comprises a flat anchor backing plate, a hollow backing plate, an anchor cable dynamometer, a positioner, a work anchor, a limiting plate, a load applying device and a tool anchor which are sequentially arranged. The surface of the flat anchor backing plate is provided with a groove which can accommodate a part of the hollow backing plate. The hollow backing plate and the anchor cable dynamometer have the same cross section shape and size. The positioner has a hollow structure. The hollow part is divided into two segments along the thickness direction. The upper segment of the hollow part can accommodate a part of the work anchor while the lower segment of the hollow part can accommodate a part of the anchor cable dynamometer. The measuring system has the advantages of simple operations, accurate testing results and reliability.

Description

The flat anchor prestress of thin wall concrete structure multi beam measuring system
Technical field
The utility model relates to xoncrete structure prestress measuring system, relates in particular to the flat anchor prestress of thin wall concrete structure multi beam measuring system.
Background technology
Current prestressed reinforced concrete construction has been widely used in the civil engineering works such as bridge, hydro-structure, building structure, ocean platform, in economic and social development, is bringing into play more and more important effect.The key of construction of prestressed concrete structure is prestressed applying, if the prestress value of deformed bar reality is less than design load, cannot according to designing requirement, bring into play the superiority of prestressed reinforced concrete construction, can affect load-bearing capacity and the security of structure.Thereby in construction of prestressed concrete structure and operational process, need to monitor the prestress value of deformed bar, pass judgment on and whether meet design to prestressed requirement.How the many factors that causes loss of prestress in Practical Project, accurately test in prestressed concrete member the actual prestress of presstressed reinforcing steel and be a key and complicated problem.At present, in fields such as bridge ,Gong China Democratic National Construction Associations, section is large, multi beam prestress is arranged general doughnut backing plate, the circular dynamometer of adopting, and data shows that the prestressed, reinforced dynamometry evaluation of this pattern dynamometric system can truly reflect deformed bar actual forced status.But for thin wall concrete structures such as large thin-wall aqueduct, pumping plants, thickness is often smaller, the workplace of conventional square, circular porous prestressed anchor backing plate, dynamometer is larger in the market, cannot be supported on thin-wall construction.Therefore thin-wall construction, multi beam deformed bar need to adopt Flat shape anchor tie-plate, dynamometer also adopts flat, circular dynamometric system arrangement and method of testing with reference to above-mentioned comparative maturity, dynamometry evaluation is often inconsistent with jack oil meter reading, and differ larger, the loss of prestress being reflected by dynamometry evaluation surpasses design permissible value, so how little according to the section of thin wall concrete structure, flat proving installation feature, develop a set of dynamometric system and method for testing, thin-walled prestressed structure prestress detection tool is of great significance.
Utility model content
Technical problem to be solved in the utility model is to overcome pre existing stress measurement system and is applied to the excessive deficiency of the existing error of measured data of thin wall concrete structure, the flat anchor prestress of a kind of thin wall concrete structure multi beam measuring system is provided, truly to reflect thin wall concrete structure flat deformed bar arrangement prestress value, for the application of the engineering of prestressed concrete in thin-wall construction provides reliable data reference, for engineering design and safe operation provide technical support.
The flat anchor prestress of thin wall concrete structure multi beam of the present utility model measuring system, described thin wall concrete structure is the structure that minimum transverse cross-sectional dimension is less than 50cm, described multi beam refers to that an anchor cable at least comprises three prestress wires; Described measuring system comprises Flat shape anchor tie-plate, hollow backing plate, anchor dynamometer, steady arm, work anchor, limiting plate, load bringing device and the moveable anchor setting gradually; The surface of Flat shape anchor tie-plate is provided with the groove that just can partly hold hollow backing plate; The shape of cross section of hollow backing plate and anchor dynamometer, measure-alike; Steady arm is hollow structure, hollow space through-thickness is divided into two sections, the epimere of hollow space just can partly hold work anchor, and the hypomere of hollow space just can partly hold anchor dynamometer, at the hollow space work anchor of steady arm, directly contacts with the stress area of anchor dynamometer.
Preferably, described anchor dynamometer is 3 pore structures, and wherein mesopore is circular, one of the centre anchor cable of corresponding work anchor; Two side holes is semicircle+square+semicircle, the anchor cable in respectively corresponding work anchor left side and the anchor cable on right side.
The measuring method of the flat anchor prestress of thin wall concrete structure multi beam measuring system as mentioned above, comprises the following steps:
Step 1, anchor dynamometer and load bringing device are carried out to supporting associating calibration;
Foreign material in step 2, cleaning anchor plate groove, install hollow backing plate;
Step 3, installation anchor dynamometer, carry out zero load reading;
Step 4, installment work anchor and intermediate plate;
Step 5, installation positioner, make work anchor and anchor dynamometer centering;
Step 6, mounting limit plate, load bringing device and moveable anchor and intermediate plate;
Step 7, carry out hierarchical loading, read anchor dynamometer reading;
Step 8, unload, read anchor dynamometer reading.
Preferably, described hierarchical loading is 3 grades of loadings, and pretensioning is to 30% of design load, quiet stopping 2 minutes; Then be stretched to 70% of design load, quiet stopping 2 minutes; Finally be stretched to 105% of builder's tonnage, quiet stopping 3 minutes.
Compared to existing technology, the utlity model has following beneficial effect:
The utility model adopts measure and a set of corresponding installation testing methods such as hollow backing plate, steady arm, farthest eliminated the error producing in prestress measuring process, Wei testing laboratory and engineering ground environmental baseline are carried out the measurement of the flat anchor deformed bar of thin wall concrete structure prestress value provides relative simple to operate, dynamometric system and method that test result is reliable and stable, and having avoided to greatest extent proving installation, operating personnel people is the error causing.
Accompanying drawing explanation
Fig. 1 is the flat anchor prestress of thin wall concrete structure multi beam of the present utility model measuring system structural representation; Number in the figure implication is as follows:
1 is Flat shape anchor tie-plate, and 2 is hollow backing plate, and 3 is anchor dynamometer, and 4 is steady arm, and 5 is work anchor, and 6 is limiting plate, and 7 is load bringing device, and 8 is moveable anchor;
Fig. 2 (a), Fig. 2 (b), Fig. 2 (c) are followed successively by vertical view, left view, the sectional side elevation of hollow backing plate;
Fig. 3 (a), Fig. 3 (b), Fig. 3 (c) are followed successively by vertical view, left view, the sectional side elevation of anchor dynamometer;
Fig. 4 (a), Fig. 4 (b), Fig. 4 (c) are followed successively by vertical view, left view, the sectional side elevation of steady arm.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is elaborated:
In the such engineering of the U-shaped aqueduct in similar Shahe, ring orientation prestress is very important to cell body bearing capacity, work condition, and how accurately, reliably the features such as section is large, thin-walled, ring orientation prestress multi beam flat layout that it has, carry out the loss of ring orientation prestress reinforcing bar and test and evaluate very important.Yet find in Practical Project, because structure section size is less, many steel strand wires are not suitable for adopting doughnut backing plate, be also not suitable for adopting the circular dynamometer of existing comparative maturity to carry out prestress monitoring.While adopting flat dynamometric system arrangement and method of testing, while often occurring that presstressed reinforcing steel is put, part dynamometer numerical value is larger compared with design load deviation, when maximum, can reach 48%, dynamometry evaluation with also exist inconsistently with jack oil tabular value, dynamometry evaluation cannot truly reflect the stress of presstressed reinforcing steel.Through great many of experiments analysis, find, affect flat anchor dynamometer deviation of reading and mainly contain more greatly following reason:
1) the flat anchor twisted wire of single hole hoop is arranged as many (being no less than 3), adopts dynamometry to count porous (being no less than 3 holes), and every twisted wire is separately through dynamometer, stretch-draw or can produce friction between twisted wire and dynamometer while putting, thus can affect dynamometer reading;
2) deformed bar, anchor plate, dynamometer, work anchor and lifting jack are difficult to centering, and during stretching construction, dynamometer exists bias voltage phenomenon, and 4 vibratory string readings of dynamometer differ larger, can cause the distortion of dynamometry evaluation;
3) dynamometer belongs to exact instrument, and outside force environment especially compression face flatness is had relatively high expectations, and flat anchor anchor plate and dynamometer surface of contact are untreated, more coarse, and indivedual anchor plates top is uneven, to dynamometry evaluation, also can affect greatly;
4) dynamometer has carried out independent calibration before dispatching from the factory, and lifting jack has also carried out combining calibration with oil meter, but two cover dynamometric systems are combined calibration, have error between system.
According to above analysis, designed the flat anchor prestress of the thin wall concrete structure multi beam measuring system shown in Fig. 1, described thin wall concrete structure is the structure that minimum transverse cross-sectional dimension is less than 50cm, and described multi beam refers to that an anchor cable is at least three prestress wires (at least having 3 anchor cable holes).As shown in the figure, this measuring system comprises Flat shape anchor tie-plate 1, hollow backing plate 2, anchor dynamometer 3, steady arm 4, work anchor 5, limiting plate 6, load bringing device 7 and the moveable anchor 8 setting gradually.Flat shape anchor tie-plate 1 upper face has groove, and this groove planar dimension is slightly larger than hollow backing plate 2, just holding portion hollow backing plate 2.The structure of hollow backing plate 2 is as shown in Fig. 2 (a)~Fig. 2 (c), and its sectional dimension is with anchor dynamometer 3, and bottom is arranged in the groove of flat ground tackle 1, and top contacts with the bottom surface of anchor dynamometer 3.In order to reduce the impact on measurement result of friction force between steel strand wires and dynamometer, the present embodiment stream line dynamometer 3 is 3 pore structures (as shown in Fig. 3 (a)~Fig. 3 (c)), and wherein mesopore is circular, one of the centre anchor cable of corresponding work anchor 5; Two side holes is semicircle+square+semicircle, the anchor cable in difference corresponding work anchor 5 left sides and the anchor cable on right side, and the bottom of anchor dynamometer 3 contacts with hollow backing plate 2, and top is arranged on steady arm 4 bottom hollow spaces.The hole count of work anchor 5, with anchor cable steel strand wires radical, is arranged on steady arm 4 top hollow spaces.Steady arm 4 is locating device, and its structure, as shown in Fig. 4 (a)~Fig. 4 (c), is hollow structure, and top hollow planar dimension is with work anchor 5 planar dimensions, and bottom hollow planar dimension is with anchor dynamometer 3 planar dimensions.Limiting plate 6 can adopt existing product, the supporting limiting plate of BM15-5 ground tackle that for example Liu work Ou Weimu produces, and its planar dimension is with work anchor 5, and bottom contacts with work anchor 5, and top contacts with load bringing device 7, in order to control work ground tackle amount of recovery.Load bringing device 7 is generally hydraulic jack, in order to stretch-draw prestressing force steel strand wires.Moveable anchor 8 is arranged on load bringing device 7 tops, with intermediate plate together in order to fixing steel strand wires.
While utilizing above-mentioned measuring system to carry out prestress measurement, comprise the following steps:
Step 1, anchor dynamometer and load bringing device are carried out to supporting associating calibration;
Foreign material in step 2, cleaning anchor plate groove, install hollow backing plate;
Step 3, installation anchor dynamometer, carry out zero load reading;
Step 4, installment work anchor and intermediate plate;
Step 5, installation positioner, make work anchor and anchor dynamometer centering;
Step 6, mounting limit plate, load bringing device and moveable anchor and intermediate plate;
Step 7, carry out hierarchical loading, read anchor dynamometer reading; Wherein hierarchical loading preferably adopts the method for 3 grades of loadings, and pretensioning is to 30% of design load, quiet stopping 2 minutes; Then be stretched to 70% of design load, quiet stopping 2 minutes; Finally be stretched to 105% of builder's tonnage, quiet stopping 3 minutes;
Step 8, unload, read anchor dynamometer reading.
In order to verify effect of the present utility model, carried out following contrast experiment:
Experiment 1, the prestressed, reinforced value test of large-scale water delivery U-shaped xoncrete structure (No. 1) ring orientation prestress:
To certain Pin groove (No. 1) carry out prestress and carry out stretch-draw, stretch-draw does not adopt hollow backing plate and steady arm, dynamometer adopts 5 holes, lifting jack is combined calibration with dynamometer, adopt 5 grades of stretch-draw, be 10%, 25%, 50%, 75%, 100% stretch-draw step by step that stretching mode adopts builder's tonnage, all the other are with the utility model testing procedure, and dynamometer measured value is as shown in table 1.From table, when unloading, the loss of prestress being reflected by dynamometer is larger, and maximum reaches 43.23%.
Table 1 test 1 rope dynamometer monitoring force value (unit: ton)
Anchor cable numbering/feature constantly D P15 D P16 D P17 D P18
Afterbody stretch-draw 100.17 76.33 94.14 88.80
Unloading 56.87 51.58 66.18 57.19
Loss of prestress (%) after unloading 43.23 32.42 30.15 35.59
Experiment 2, the prestressed, reinforced value test of large-scale water delivery U-shaped xoncrete structure (No. 2) ring orientation prestress:
To certain Pin groove (No. 2) carry out prestress and carry out stretch-draw, stretch-draw adopts measuring system of the present utility model and method of testing, adopts hollow backing plate and steady arm that is:, and dynamometer adopts 3 holes, lifting jack is combined calibration with dynamometer, and dynamometer measured value is as shown in table 2.From table, when unloading, the loss of prestress being reflected by dynamometer, in 15.0% left and right, has truly reflected the stress of deformed bar.
Table 2 test 2 rope dynamometer monitoring force values (unit: ton)
Anchor cable numbering/feature constantly D P15 D P16 D P17 D P18
Afterbody stretch-draw 99.54 100.10 100.47 97.69
Unloading 83.75 83.71 83.94 87.54
Loss of prestress (%) after unloading 15.86 17.20 16.45 10.39
From above contrast experiment, can find out, compare classic method, the utlity model has the advantages such as operation is relatively simple, and test result is accurate, reliable.

Claims (2)

1. the flat anchor prestress of thin wall concrete structure multi beam measuring system, described thin wall concrete structure is the structure that minimum transverse cross-sectional dimension is less than 50cm, described multi beam refers to that an anchor cable at least comprises three prestress wires; It is characterized in that, described measuring system comprises Flat shape anchor tie-plate (1), hollow backing plate (2), anchor dynamometer (3), steady arm (4), work anchor (5), limiting plate (6), load bringing device (7) and the moveable anchor (8) setting gradually; The surface of Flat shape anchor tie-plate (1) is just provided with can partly hold the groove of hollow backing plate (2); The shape of cross section of hollow backing plate (2) and anchor dynamometer (3), measure-alike; Steady arm (4) is hollow structure, hollow space through-thickness is divided into two sections, the epimere of hollow space just can partly hold work anchor (5), the hypomere of hollow space just can partly hold anchor dynamometer (3), at the hollow space work anchor (5) of steady arm (4), directly contacts with the stress area of anchor dynamometer (3).
2. the flat anchor prestress of thin wall concrete structure multi beam measuring system as claimed in claim 1, is characterized in that, described anchor dynamometer (3) is 3 pore structures, and wherein mesopore is circular, one of the centre anchor cable of corresponding work anchor (5); Two side holes is semicircle+square+semicircle, respectively the anchor cable in corresponding work anchor (5) left side and the anchor cable on right side.
CN201320541646.1U 2013-08-30 2013-08-30 Thin-wall concrete structure multi-strand flat anchor pre-stress measuring system Active CN203443724U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103454026A (en) * 2013-08-30 2013-12-18 河南省水利勘测设计研究有限公司 Measuring system and measuring method for multi-beam flat anchor prestress of thin wall concrete structure
CN110440854A (en) * 2019-07-25 2019-11-12 湖北省水利水电规划勘测设计院 Prestressing force aqueduct based on sensing network monitors system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103454026A (en) * 2013-08-30 2013-12-18 河南省水利勘测设计研究有限公司 Measuring system and measuring method for multi-beam flat anchor prestress of thin wall concrete structure
CN110440854A (en) * 2019-07-25 2019-11-12 湖北省水利水电规划勘测设计院 Prestressing force aqueduct based on sensing network monitors system and method

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