CN105019484A - Settlement monitoring method applied to comprehensive pipe rack - Google Patents

Abstract

The invention discloses a settlement monitoring method applied to a comprehensive pipe rack. The settlement monitoring method specifically comprises the steps that a measurement reference point and measurement points are arranged in the comprehensive pipe rack, optical fiber grating sensors are arranged on the measurement reference point and all the measurement points respectively, all the optical fiber grating sensors are connected through communication pipes, and communication liquid is sealed in the communication pipes; the signal output ends of all the optical fiber grating sensors are connected with an interrogator; the initial elevations of the measurement reference point and all the measurement points are given, the initial pressure intensity and the pressure intensity obtained after settlement of the measurement reference point and the measurement points are monitored through the optical fiber grating sensors, and the settlement of any measurement point can be obtained through calculation according to the change of the pressure intensity, obtained before and after settlement, of the measurement reference point and the change of the pressure intensity, obtained before and after settlement, of the corresponding measurement point. According to the settlement monitoring method, the optical fiber grating sensing technology and the pressure sensing technology are combined to be used for carrying out settlement tests on the power comprehensive pipe rack or the municipal comprehensive pipe rack which is a long-distance linear infrastructure, and the problems that in a static force level gauge, pressure balance is achieve through flowing of contained water, consequently, the range is limited, and the water surface can hardly reach balance are solved.

Description

A kind of Monitoring method of the subsidence being applied to pipe gallery

Technical field

The present invention relates to the subsidence monitoring of foundation technical field in electric integrated piping lane or municipal administration synthesis pipe gallery, particularly a kind of Monitoring method of the subsidence being applied to pipe gallery.

Background technology

In wire infrastructure, the rigidity of structure and resistance to overturning extremely responsive to sedimentation index, the rule of development of Subsidence trend comprises, and the sudden change of consecutive points difference means the situation of change of wire infrastructure rigidity, usually along with the emergence and development of Structural defect.The infrastructure of carrying out settlement monitoring is at present in the majority with traffic class infrastructure, as track traffic, tunnel, large bridge, railway etc.Due to the structural form of its uniqueness, prior art many employings hydrostatic level.But for electric integrated piping lane or municipal administration synthesis pipe gallery pipe gallery, due to its distance, drop is large, and existing technology also cannot well be dealt with problems.

Summary of the invention

The technical problem to be solved in the present invention is: utilize fiber grating sensing technology and pressure sensing technology, sedimentation test is carried out to electric integrated piping lane or this long-distance line shape of municipal administration synthesis pipe gallery pipe gallery infrastructure, overcomes in hydrostatic level and realize by own water body flow the difficult problem that the range finite sum water surface that pressure balance brings is difficult to balance.

The technical scheme that the present invention takes is specially: a kind of Monitoring method of the subsidence being applied to pipe gallery, the survey mark that a datum mark without sedimentation and more than 1 are positioned at pipe gallery is set, datum mark and each survey mark arrange fiber-optic grating sensor respectively, each fiber-optic grating sensor was connected by communicating pipe, communicating pipe inner sealing have connection liquid; The signal output part of each fiber-optic grating sensor connects (FBG) demodulator respectively;

Definition datum mark and the initial elevation of each survey mark are H ₀₁, H ₀₂..., H _0n; By pressure after fiber-optic grating sensor monitoring datum mark and the initial pressure of each survey mark and sedimentation; The initial pressure of definition datum mark and each survey mark is Δ P ₁, Δ P ₂..., Δ Pn;

After definition generation sedimentation, each datum mark and survey mark elevation are H ₀₁', H ₀₂' ..., H _0n', after sedimentation, the pressure of datum mark and each survey mark is Δ P ₁', Δ P ₂' ..., Δ Pn ',

Then the sedimentation of survey mark can be obtained by following formula:

(H ₀₂′-H ₀₂)＝(H ₀₁′-H ₀₁)+(ΔP ₁′-ΔP ₁)-(ΔP ₂′-ΔP ₂)

(H _0n′-H _0n)＝(H ₀₁′-H ₀₁)+(ΔP ₁′-ΔP ₁)-(ΔPn′-ΔPn)

Because datum mark changes without sedimentation, only have pressure change, therefore above formula is reduced to further:

(H ₀₂′-H ₀₂)＝(ΔP ₁′-ΔP ₁)-(ΔP ₂′-ΔP ₂)

(H _0n′-H _0n)＝(ΔP ₁′-ΔP ₁)-(ΔPn′-ΔPn)

Namely the sedimentation of any survey mark calculates by the pressure change of the pressure change of sedimentation fore-and-aft survey reference point and corresponding survey mark is substituted into above formula.

In the inventive method, each measuring point sensor was linked together by communicating pipe, and according to connecting pipe principle, static communicating pipe, each point position liquid pressure was consistent.Namely before sedimentation:

H ₀₁+ΔP ₁＝H ₀₂+ΔP ₂＝H ₀₃+ΔP ₃(1)；

When corresponding sedimentation occurs in each survey mark position, can there is corresponding change in various point locations elevation and cell pressure, then:

H ₀₁′+ΔP ₁′＝H ₀₂′+ΔP ₂′＝H ₀₃′+ΔP ₃′ (2)

(2) formula is deducted (1) formula, can obtain:

(H ₀₁′-H ₀₁)+(ΔP ₁′-ΔP ₁)＝(H ₀₂′-H ₀₂)+(ΔP ₂′-ΔP ₂)＝(H ₀₃′-H ₀₃)+(ΔP ₃′-ΔP ₃) (3)

And then the settlement calculation method of each test point can be obtained.

Fiber-optic grating sensor of the present invention and demodulator thereof are existing product, measurement point is converted into deformation in the water pressure change of different elevation by fiber-optic grating sensor, then obtain corresponding pressure according to pressure to the corresponding relation analysis of deformation by demodulator, thus obtain the pressure of each survey mark and datum mark further.

Beneficial effect of the present invention is: the principle transmitted by pressure achieves each measuring point sedimentation test, can overcome in hydrostatic level and realize by own water body flow the difficult problem that the range finite sum water surface that pressure balance brings is difficult to balance.

Accompanying drawing explanation

Figure 1 shows that datum mark and each survey mark original state schematic diagram in pipe gallery;

To Figure 2 shows that in pipe gallery view after datum mark and each survey mark sedimentation.

Detailed description of the invention

Further describe below in conjunction with the drawings and specific embodiments.

The present invention is based on existing fiber bragg grating pressure sensor technical design, method is specially: arrange the survey mark that a datum mark without sedimentation and more than 1 are positioned at pipe gallery, datum mark and each survey mark arrange fiber-optic grating sensor respectively, each fiber-optic grating sensor was connected by communicating pipe, communicating pipe inner sealing have connection liquid; The signal output part of each fiber-optic grating sensor connects (FBG) demodulator respectively; Fiber-optic grating sensor and (FBG) demodulator are existing product, and (FBG) demodulator can accept the deformation signal that fiber-optic grating sensor exports, and deformation signal are converted into pressure change, and then obtain pressure change.

Definition datum mark and the initial elevation of each survey mark are H ₀₁, H ₀₂..., H _0n; By pressure after fiber-optic grating sensor monitoring datum mark and the initial pressure of each survey mark and sedimentation; The initial pressure of definition datum mark and each survey mark is Δ P ₁, Δ P ₂..., Δ Pn;

After definition generation sedimentation, each datum mark and survey mark elevation are H ₀₁', H ₀₂' ..., H _0n', after sedimentation, the pressure of datum mark and each survey mark is Δ P ₁', Δ P ₂' ..., Δ Pn ',

Then the sedimentation of survey mark can be obtained by following formula:

(H ₀₂′-H ₀₂)＝(H ₀₁′-H ₀₁)+(ΔP ₁′-ΔP ₁)-(ΔP ₂′-ΔP ₂)

(H _0n′-H _0n)＝(H ₀₁′-H ₀₁)+(ΔP ₁′-ΔP ₁)-(ΔPn′-ΔPn)

Because datum mark changes without sedimentation, only have pressure change, therefore above formula is reduced to further:

(H ₀₂′-H ₀₂)＝(ΔP ₁′-ΔP ₁)-(ΔP ₂′-ΔP ₂)

(H _0n′-H _0n)＝(ΔP ₁′-ΔP ₁)-(ΔPn′-ΔPn)

Namely the sedimentation of any survey mark calculates by the pressure change of the pressure change of sedimentation fore-and-aft survey reference point and corresponding survey mark is substituted into above formula.

In the inventive method, each survey mark sensor was linked together by communicating pipe, according to connecting pipe principle, static communicating pipe each point position elevation and liquid pressure be consistent, before sedimentation:

H ₀₁+ΔP ₁＝H ₀₂+ΔP ₂＝H ₀₃+ΔP ₃(1)；

When corresponding sedimentation occurs in each survey mark position, can there is corresponding change in various point locations elevation and cell pressure, then:

H ₀₁′+ΔP ₁′＝H ₀₂′+ΔP ₂′＝H ₀₃′+ΔP ₃′ (2)

(2) formula is deducted (1) formula, can obtain:

(H ₀₁′-H ₀₁)+(ΔP ₁′-ΔP ₁)＝(H ₀₂′-H ₀₂)+(ΔP ₂′-ΔP ₂)＝(H ₀₃′-H ₀₃)+(ΔP ₃′-ΔP ₃) (3)

And then the settling amount of each test point can be obtained.

Measurement point is converted into deformation in the water pressure change of different elevation by fiber-optic grating sensor of the present invention, thus measure the pressure obtaining each survey mark and datum mark, and then achieve each measuring point sedimentation test by the principle that pressure transmits, can overcome in hydrostatic level and realize by own water body flow the difficult problem that the range finite sum water surface that pressure balance brings is difficult to balance.

Claims (1)

1. one kind is applied to the Monitoring method of the subsidence of pipe gallery, it is characterized in that, the survey mark that a datum mark without sedimentation and more than 1 are positioned at pipe gallery is set, datum mark and each survey mark arrange fiber-optic grating sensor respectively, each fiber-optic grating sensor was connected by communicating pipe, communicating pipe inner sealing have connection liquid; The signal output part of each fiber-optic grating sensor connects (FBG) demodulator respectively;

Definition datum mark and the initial elevation of each survey mark are H ₀₁, H ₀₂..., H _0n; By pressure after fiber-optic grating sensor monitoring datum mark and the initial pressure of each survey mark and sedimentation; The initial pressure of definition datum mark and each survey mark is Δ P ₁, Δ P ₂..., Δ Pn;

After definition generation sedimentation, each datum mark and survey mark elevation are H ₀₁', H ₀₂' ..., H _0n', after sedimentation, the pressure of datum mark and each survey mark is Δ P ₁', Δ P ₂' ..., Δ Pn ',

Then the sedimentation of survey mark can be obtained by following formula:

(H ₀₂′-H ₀₂)＝(H ₀₁′-H ₀₁)+(ΔP ₁′-ΔP ₁)-(ΔP ₂′-ΔP ₂)

(H _0n′-H _0n)＝(H ₀₁′-H ₀₁)+(ΔP ₁′-ΔP ₁)-(ΔPn′-ΔPn)

Because datum mark changes without sedimentation, only have pressure change, therefore above formula is reduced to further:

(H ₀₂′-H ₀₂)＝(ΔP ₁′-ΔP ₁)-(ΔP ₂′-ΔP ₂)

(H _0n′-H _0n)＝(ΔP ₁′-ΔP ₁)-(ΔPn′-ΔPn)

Namely the sedimentation of any survey mark calculates by the pressure change of the pressure change of sedimentation fore-and-aft survey reference point and corresponding survey mark is substituted into above formula.