CN103591875A - Creeping measuring method for curved continuous box girder - Google Patents

Abstract

The invention discloses a creeping measuring method for a curved continuous box girder. The inventor obtains scientific calculation formulas (formulas 1-5) of creeping amount through geometrical deduction, and provides the measuring method for the curved continuous box girder. According to the method, the requirement for equipment is low, the measuring cost is low, the measuring process is simple, the accuracy is high, the result is reliable, and the shortcomings that the accuracy is low and the equipment is expensive due to angle measurement in complex displacement are avoided. By applying the method to the bridge detection field, the creeping amount of the curved continuous box girder can be measured and judged with high accuracy and speed, and the bridge health condition and the structural safety can be judged.

Description

Continuous Box Girder is climbed shift measurement method

Technical field

The invention belongs to bridge testing detection technique field, relate in particular to a kind of Continuous Box Girder and climb shift measurement method, be applicable to the measurement that Continuous Box Girder is climbed beam-ends vertical, horizontal displacement while moving.

Background technology

Continuous curved box girder bridges is applied very general in modern highway and Interchanges in Cities.In some domestic large-scale interchange overpass, mostly adopted Continuous Box Girder.This is that case beam due to continuous curved box girder bridges has very strong bending resistance and torsional rigidity as a kind of closed section, and Continuous Box Girder has strengthened the comfortableness of driving.

In recent years, in operation journey, there is the Bridge Accidents that some girder slippages even overturn in some Continuous Curved Girder Bridges.In fact, Continuous Box Girder in use, effect due to layout, prestress, temperature effect, vehicular load or some other influence factor of radius-of-curvature, bearing, what make Curved Beam Bridge is subject to force rate linear beam bridge more complex, can produce radially, normal direction displacement at the stressed effect lower curve continuous beam of complexity; And due to reasons such as the design feature of Curved Continuous Beams, supporting forms, after the influence factors such as external load disappear, the displacement that Curved Continuous Beams occurs can not recover completely, and Continuous Box Girder will the expendable residual displacement of generating portion.Under prolonged and repeated effect, the remnants of displacement will constantly accumulate, and produce larger irrecoverable displacement, i.e. " climb and move " phenomenon of Curved Continuous Beams.Climbing of continuous curved box girder bridges moves, light cause the shear failure at beam section expansion joint, affects its serviceable life, heavy there will be supporting structure destruction, girder slippage and upset.If bridge occurs such problem in use procedure, not only affect traffic, and it is very difficult reinforce, and may cause huge casualties and property economic loss.

At present, conventional climbing moved detection method and mainly contained ocular estimate and total powerstation observation method.Ocular estimate is mainly straight situation, expansion joint spacing and the transversion malposition situation that adopts naked-eye observation anti-collision wall, and the method error is large, beam body is climbed to move be difficult to accurate quantification; Total powerstation observation method need arrange observation station or observation monument at bridge floor or beam feather edge, roof around of research station operated by rotary motion or position that can intervisibility ground, and research station adopts forced centering apparatus, and the surveying work cycle is relatively long, climbs shift measurement precision and generally can only accomplish grade.Therefore, the succinct measuring method of also not moving for climbing of Continuous Curved Girder Bridges so far, climbs the succinct measuring method of moving so bridge detection field is badly in need of a kind of Continuous Curved Girder Bridges.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of Continuous Box Girder easy and simple to handle, that precision is higher, with low cost and climbs shift measurement method, to realize the measurement of beam-ends vertical, horizontal displacement, is convenient to differentiate bridge structure health situation.

For solving the problems of the technologies described above, the present invention by the following technical solutions: Continuous Box Girder is climbed shift measurement method, comprises the following steps:

<1> adopts reciprocating drill at the minimum continuous beam of detected radius-of-curvature or right and wrong beam joint punching A, the direction across bridge positional distance guardrail of hole A or anti-collision wall base inner side 300～500mm, the vertical bridge of hole A is to the tested beam-ends of positional distance expansion joint 50～150mm;

<2> adopts reciprocating drill apart from 60～150mm place, expansion joint, to make a call to 2 hole B and C at other beam-ends, and hole B and C centre distance are 200～300mm, and hole A, B, the C line of centres are oxygon;

In <3> hole A, B, C, pour into anchoring adhesive, after inserting respectively round steel A, B, C, anchoring adhesive is concordant with bridge floor, make anchoring adhesive be uniformly distributed in round steel surrounding, anchoring adhesive is drawn a circle around round steel with red paint after solidifying, convenient searching rapidly later;

<4> adopts vernier caliper measurement spacing outside round steel between two, altogether 3 groups of data as initial reading, the outer lateral extent of round steel A and round steel B is C, and the outer lateral extent of round steel A and round steel C is B, and the outer lateral extent of round steel B and round steel C is A;

<5> operates when certain in the future at bridge, and the outer lateral extent of repetition measurement round steel A and round steel B obtains C ', round steel A and the outer lateral extent of round steel C obtains B ';

<6> adopts formula to calculate the amount of moving of climbing, and formula is

$\mathrm{\&Delta;x}=\frac{B^2-B^{\&prime;2}+C^{\&prime;2}-{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000415150290000012.png"\; state="\{\{state\}\}">C</figure-callout>}}^2}{2A}---\left(1\right)$

Or $\mathrm{\&Delta;x}=\frac{C^2-C^{\&prime;2}+B^{\&prime;2}-{\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="HDA0000415150290000012.png"\; state="\{\{state\}\}">B</figure-callout>}}^2}{2A}---\left(2\right)$

(1) in formula, Δ x positive sign represents that A point moves to the negative direction of x axle, and negative sign represents that A point moves to the positive dirction of x axle; (2) in formula, Δ x positive sign represents that A point moves to the positive dirction of x axle, and negative sign represents that A point moves to the negative direction of x axle;

$\mathrm{\&Delta;y}=\sqrt{B^{\&prime;2}-{\left(\frac{A^2+B^{\&prime;2}-C^{\&prime;2}}{2A}\right)}^2}-\sqrt{B^2-{\left(\frac{A^2+B^2-{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000415150290000012.png"\; state="\{\{state\}\}">C</figure-callout>}}^2}{2A}\right)}^2}---\left(3\right)$

Or $\mathrm{\&Delta;y}=\sqrt{C^{\&prime;2}-{\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="HDA0000415150290000012.png"\; state="\{\{state\}\}">A</figure-callout>}}^2+C^{\&prime;2}-B^{\&prime;2}}{2A}\right)}^2}-\sqrt{C^2-{\left(\frac{A^2+C^2-{\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="HDA0000415150290000012.png"\; state="\{\{state\}\}">B</figure-callout>}}^2}{2A}\right)}^2}---\left(4\right)$

(3) in formula and (4) formula, Δ y positive sign represents that A point is parallel to y axle pros and moves, and negative sign represents that A point is parallel to y axle negative direction and moves;

$s=\sqrt{{\mathrm{\&Delta;x}}^2+\mathrm{\&Delta;}{y}^2}---\left(5\right)$

(5) in formula, s represents always to climb the amount of moving.

Hole A, B, C hole depth 60～150mm, bore dia 10～15mm; Round steel A, B, C diameter 6～10mm, round steel length is greater than hole depth 2mm～3mm.

In step <3> hole, pour into before anchoring adhesive, adopt Blowing drum cleaning eye inner concrete particle, dust, and with air-dry after alcohol or acetone wiped clean.

Step <6> adopts program calculator or Excel software to calculate.

For existing continuous curved box girder bridges, climb the problem that the amount of moving measurement means exists, inventor derives and obtains climbing the science computing formula (formula (1)～(5)) of the amount of moving through how much, and has set up accordingly Continuous Box Girder and climbed shift measurement method.This method equipment requirement is low, it is with low cost to measure, and measuring process is simple, and precision is high, achievement is reliable, avoided that the precision that in complicated displacement, measurement of angle brings is low, the deficiency of apparatus expensive.Apply the present invention to bridge detection field, can realize that precision is high, speed is measured soon judgment curves continuous bridge and climbed the amount of moving, to differentiate bridge health situation and structural safety.

Accompanying drawing explanation

Fig. 1 is that Continuous Box Girder of the present invention is climbed climbing of shift measurement method and moved algorithm schematic diagram.

Fig. 2 is that the Curved Continuous Beams measurement of embodiment 1 is climbed and moved schematic diagram.

Fig. 3 is that the Curved Continuous Beams measurement of embodiment 2 is climbed and moved schematic diagram.

In figure: 1 guardrail base inward flange, 2 detected bridge floors, 3 beam-ends, 4 expansion joints, 5 with reference to box girder bridge face, 6 beam center lines.

Embodiment

Fig. 1 has provided the geometric meaning of measuring method of the present invention, through mathematical derivation, obtains formula (1)～(5).

Below in conjunction with embodiment and accompanying drawing, further illustrate the present invention.

Embodiment 1

As shown in Figure 2, certain continuous curved box girder bridges, adopts reciprocating drill to hole apart from 120mm place, expansion joint at tested beam-ends, be numbered A, A pitch-row is from guardrail base inward flange 354mm, at the beam-ends of reference, apart from 100mm place, expansion joint, adopts reciprocating drill to bore 2 holes, and numbering is respectively B, C; Bore dia is 12mm, and hole depth is 80mm; Adopt Blowing drum cleaning eye inner concrete particle, dust, and air-dry after alcohol or acetone wiped clean, pour into appropriate anchoring adhesive, insert respectively 3 diameter 8mm, length 83mm, guarantee that round steel is vertical, surrounding colloid is even; With red paint, around round steel, draw a circle, with after facilitating, search rapidly; Adopt wide range vernier caliper measurement spacing outside round steel between two, altogether 3 groups of data as initial reading, distance C=360.23mm outside round steel A and round steel B, the outer lateral extent B=325.87mm of round steel A and round steel C, distance A=280.45mm outside round steel B and round steel C; After bridge operation 3 months, adopt distance C outside vernier caliper repetition measurement round steel A and round steel B '=355.24mm, round steel A and outer lateral extent the B '=334.66mm of round steel C; Adopt program calculator program formula (1), formula (3) and formula (5) calculating both direction and always climb the amount of moving, try to achieve Δ x=-16.72mm, Δ y=3.59mm, always climbs the amount of moving s=17.10mm.

$\mathrm{\&Delta;x}=\frac{B^2-B^{\&prime;2}+C^{\&prime;2}-{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000415150290000012.png"\; state="\{\{state\}\}">C</figure-callout>}}^2}{2A}---\left(1\right)$

$\mathrm{\&Delta;y}=\sqrt{B^{\&prime;2}-{\left(\frac{A^2+B^{\&prime;2}-C^{\&prime;2}}{2A}\right)}^2}-\sqrt{B^2-{\left(\frac{A^2+B^2-{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000415150290000012.png"\; state="\{\{state\}\}">C</figure-callout>}}^2}{2A}\right)}^2}---\left(3\right)$

$s=\sqrt{{\mathrm{\&Delta;x}}^2+\mathrm{\&Delta;}{y}^2}---\left(5\right)$

Embodiment 2

As shown in Figure 3, certain curve Skew Continuous beam bridge, adopts reciprocating drill to hole apart from 115mm place, expansion joint at tested beam-ends, be numbered A, A pitch-row is from guardrail base inward flange 298mm, at the beam-ends of reference, apart from 126mm place, expansion joint, adopts reciprocating drill to bore 2 holes, and numbering is respectively B, C; Bore dia is 10mm, and hole depth is 90mm; Adopt Blowing drum cleaning eye inner concrete particle, dust, and air-dry after alcohol or acetone wiped clean, pour into appropriate anchoring adhesive, insert respectively 3 diameter 6mm, length 92mm, guarantee that round steel is vertical, surrounding colloid is even; With red paint, around round steel, draw a circle, with after facilitating, search rapidly; Adopt wide range vernier caliper measurement spacing outside round steel between two, altogether 3 groups of data as initial reading, distance C=346.02mm outside round steel A and round steel B, the outer lateral extent B=365.80mm of round steel A and round steel C, distance A=333.45mm outside round steel B and round steel C; After bridge operation 2 months, adopt distance C outside vernier caliper repetition measurement round steel A and round steel B '=350.68mm, round steel A and outer lateral extent the B '=374.48mm of round steel C; Adopt Excell software programming program mode (2) and formula (4) to calculate the amount of moving of climbing of both direction, try to achieve Δ x=-4.77mm, Δ y=7.26mm.

$\mathrm{\&Delta;x}=\frac{C^2-C^{\&prime;2}+B^{\&prime;2}-{\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="HDA0000415150290000012.png"\; state="\{\{state\}\}">B</figure-callout>}}^2}{2A}---\left(2\right)$

$\mathrm{\&Delta;y}=\sqrt{C^{\&prime;2}-{\left(\frac{A^2+C^{\&prime;2}-B^{\&prime;2}}{2A}\right)}^2}-\sqrt{C^2-{\left(\frac{A^2+C^2-{\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="HDA0000415150290000012.png"\; state="\{\{state\}\}">B</figure-callout>}}^2}{2A}\right)}^2}---\left(4\right)$

Claims (4)

1. Continuous Box Girder is climbed a shift measurement method, it is characterized in that comprising the following steps:

<1> adopts reciprocating drill at the minimum continuous beam of detected radius-of-curvature or right and wrong beam joint punching A, the direction across bridge positional distance guardrail of hole A or anti-collision wall base inner side 300～500mm, the vertical bridge of hole A is to the tested beam-ends of positional distance expansion joint 50～150mm;

<2> adopts reciprocating drill apart from 60～150mm place, expansion joint, to make a call to 2 hole B and C at other beam-ends, and hole B and C centre distance are 200～300mm, and hole A, B, the C line of centres are oxygon;

In <3> hole A, B, C, pour into anchoring adhesive, insert respectively round steel A, B, C after anchoring adhesive concordant with bridge floor, make anchoring adhesive be uniformly distributed in round steel surrounding;

<4> adopts vernier caliper measurement spacing outside round steel between two, altogether 3 groups of data as initial reading, the outer lateral extent of round steel A and round steel B is C, and the outer lateral extent of round steel A and round steel C is B, and the outer lateral extent of round steel B and round steel C is A;

<5> operates when certain in the future at bridge, and the outer lateral extent of repetition measurement round steel A and round steel B obtains C ', round steel A and the outer lateral extent of round steel C obtains B ';

<6> adopts formula to calculate the amount of moving of climbing, and formula is

$\mathrm{\&Delta;x}=\frac{B^2-B^{\&prime;2}+C^{\&prime;2}-C^2}{2A}---\left(1\right)$

Or $\mathrm{\&Delta;x}=\frac{C^2-C^{\&prime;2}+B^{\&prime;2}-B^2}{2A}---\left(2\right)$

(1) in formula, Δ x positive sign represents that A point moves to the negative direction of x axle, and negative sign represents that A point moves to the positive dirction of x axle;

(2) in formula, Δ x positive sign represents that A point moves to the positive dirction of x axle, and negative sign represents that A point moves to the negative direction of x axle;

$\mathrm{\&Delta;y}=\sqrt{B^{\&prime;2}-{\left(\frac{A^2+B^{\&prime;2}-C^{\&prime;2}}{2A}\right)}^2}-\sqrt{B^2-{\left(\frac{A^2+B^2-C^2}{2A}\right)}^2}---\left(3\right)$

Or $\mathrm{\&Delta;y}=\sqrt{C^{\&prime;2}-{\left(\frac{A^2+C^{\&prime;2}-B^{\&prime;2}}{2A}\right)}^2}-\sqrt{C^2-{\left(\frac{A^2+C^2-B^2}{2A}\right)}^2}---\left(4\right)$

(3) in formula and (4) formula, Δ y positive sign represents that A point is parallel to y axle pros and moves, and negative sign represents that A point is parallel to y axle negative direction and moves;

$s=\sqrt{{\mathrm{\&Delta;x}}^2+\mathrm{\&Delta;}{y}^2}---\left(5\right)$

(5) in formula, s represents always to climb the amount of moving.

2. Continuous Box Girder according to claim 1 is climbed shift measurement method, it is characterized in that: described hole A, B, C hole depth 60～150mm, bore dia 10～15mm; Described round steel A, B, C diameter 6～10mm, round steel length is greater than hole depth 2mm～3mm.

3. Continuous Box Girder according to claim 2 is climbed shift measurement method, it is characterized in that pouring into before anchoring adhesive in step <3> hole, adopt Blowing drum cleaning eye inner concrete particle, dust, and with air-dry after alcohol or acetone wiped clean.

4. Continuous Box Girder according to claim 3 is climbed shift measurement method, it is characterized in that step <6> adopts program calculator or Excel software to calculate.

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