CN102995670B - Soil excavation rectification construction monitoring method of existing building - Google Patents

Abstract

The invention belongs to the technical field of a reinforcement project of a building structure, and particularly relates to a monitoring method in soil excavation rectification construction of the existing building. The monitoring method comprises the following steps of: comparing and verifying the building inclination and sedimentation variation of the building actually measured in the rectification process of the building with the theoretically calculated inclination and sedimentation variation, carrying out soil excavation rectification on the building according to the change degree when the numerical values are consistent; checking and finding out the reasons for difference when the difference of the numerical values is large, retesting and retrying until the numerical values are consistent; carrying out soil excavation rectification on the building according to the inclination degree consistence value until the building accords with the vertical standard request, wherein the actually measured value is obtained by testing the inclination degree of the building by a total station, and the theoretically calculated value is obtained according to the method and equation. By adopting the soil excavation rectification construction monitoring method of the existing building, the scientificity and accuracy of the soil excavation rectification are improved; and the rectification efficiency is higher, and the rectification quality is better.

Description

A kind of existing building soil digging Deviation Correction Construction method for supervising

Technical field

The invention belongs to building structure strengthening field of engineering technology, specifically relate to a kind of method for supervising existing building carried out in soil digging Deviation Correction Construction.

Background technology

Soil digging correction is by the little side soil digging of building deformation, remove the local stress in foundation soil, cause the stresses re-distribution of the soil body, the side foundation stress little at foundation settlement increases, thus produce larger compressive strain, make building reach the object of slowly correction.

Soil digging method for correcting error is generally used for the building of shallow foundation, and foundation soil is advisable with soil such as cohesive soil, silt, plain fill, mucky soil, sandy soils.

The engineering object that soil digging correction is suitable for mainly contains:

Ground soil property is uneven, and the inclination that there is soft layer or the dark pool is transfinited house.

Base foundation design and type selecting improper, position of centre of gravity, settlement joint etc. arrange the improper building causing tilting to transfinite.

Construction technology is improper or construction quality is inferior, and the too fast ground that causes of constructing is extruded, and a large amount of preloading in building side causes certain to roll the building tiltedly transfinited.

Mud or soft clay region, the building demolition adjacent with certain building, local off-load causes ground lateral compression to cause the building tilting to transfinite.

Building foundation groundwater table changes, and underflow takes away the soil body below building, causes land subsidence, subsides and building inclination is transfinited.

The building inclination that when landslide, earthquake, the natural calamity such as liquefaction of soil mass causes transfinites.

The applicable requirement of soil digging correction to building: building is approximately a rigid body, is out of shape with base integral.Relative contour of building size, sedimentation, inclination etc. are small deformation.

Conventional soil digging deviation correcting technology can only for the numerical value of the sedimentation of certain single observation point, tilt quantity in soil digging process, by virtue of experience judging that the deflection that the structural strain's amount and needing afterwards of building is corrected, final correction reach criterion of acceptability is the restriction that the tilt quantity of each observation point of building all reaches regulation and stipulation.Measuring error or error that this kind of reinforcement and rectification flow process is difficult to seeing time keeping instrument judge, and cannot hold in overall aspect building, easily cause erroneous judgement, easily cause irrational soil digging, increase soil digging number of times.

Summary of the invention

The object of this invention is to provide a kind of existing building soil digging Deviation Correction Construction method for supervising, cannot the deflection of building be held in overall aspect to overcome existing soil digging deviation correcting technology and easily cause the problem of erroneous judgement.

The object of the invention is to be achieved through the following technical solutions:

A kind of existing building soil digging Deviation Correction Construction method for supervising, is characterized in that:

Described method for supervising comprises and contrasting the actual test value of the building inclination in rectifying of leaned building process and calculated value, examines;

When both numerical value are consistent: by inclined degree, soil digging correction is carried out to building;

When both numerical value difference are larger: check and find difference reason, repetition measurement, double calculation are consistent to both, carry out soil digging correction by inclined degree homogeneity value to building;

Until building to meet standard-required vertical;

Described actual test value is tested by the inclined degree of total powerstation to building;

Described calculated value obtains by following method and formula:

In the corner of structure foundation, corner and sudden change place, at least 10 observation points are set,

Inclination building rectification by horizontal control network is measured, measurement of the level records each settlement observation point plane coordinates and elevation, is set to A before correction starts ₁₁(x ₁₁, y ₁₁, z ₁₁), A ₁₂(x ₁₂, y ₁₂, z ₁₂) ... A _1n(x _1n, y _1n, z _1n), get the Z-direction value of relative initial observation coordinate

$z_0=\frac{1}{n}{\mathrm{\Σ}}_1^n{Z}_{1i}$ (formula 4.1-1)

As the datum π 1 before correction,

Settlement observation point coordinates then after adjustment is A ₁₁(x ₁₁, y ₀₁, z ₀), A ₁₂(x ₁₂, y ₁₂, z ₀) ... A _1n(x _1n, y _1n, z ₀), their z have modified s1=z respectively to relief displacement ₁₁-z ₀, s2=z ₁₂-z ₀sn=z _1n-z ₀, s=(s1, s2 ... sn) ^tbe called index vector, wherein si moves down for just representing, and si is for negative representative moves, and so, the initial elevation of all settlement observation points is all corrected to an initial water plane π ₁(z=z ₀) on;

After correction starts, building is rectified a deviation, and relative initial plane changes to π i plane, if π i equation is:

π _i: a x+b y-z+c=0(formula 4.1-2)

Construct a function F:

F=[（z _i1-s1）-（a x _i1+b y _i1+c）] ²+[（z _i2-s2）-（a x _i2+b y _i2+c）] ²+……

[(z _in-sn)-(a x _in+ b _yin+c)] ²(formula 4.1-3)

F gets minimum value season

$\frac{\∂F}{\∂a}=0;$ $\frac{\∂F}{\∂b}=0;$ $\frac{\∂F}{\∂c}=0$ (formula 4.1-4) solves

$\left.\begin{array}{c}\mathrm{a\Σ}{x_{\mathrm{ik}}}^2+\mathrm{b\Σ}{x}_{\mathrm{ik}}*y_{\mathrm{ik}}+\mathrm{c\Σ}{x}_{\mathrm{ik}}=\mathrm{\Σ}(z_{\mathrm{ik}}-\mathrm{sk})*x_{\mathrm{ik}}\\ \mathrm{a\Σ}{x}_{\mathrm{ik}}*y_{\mathrm{ik}}+\mathrm{b\Σ}{y_{\mathrm{ik}}}^2+\mathrm{c\Σ}{y}_{\mathrm{ik}}=\mathrm{\Σ}(z_{\mathrm{ik}}-\mathrm{sk})*y_{\mathrm{ik}}\\ \mathrm{a\Σ}{x}_{\mathrm{ik}}+\mathrm{b\Σ}{y}_{\mathrm{ik}}+c*n=\mathrm{\Σ}(z_{\mathrm{ik}}-\mathrm{sk})\end{array}\right\}$ ---(formula 4.1-5)

Solve formula 4.1-5 ternary system of linear equations, if a, b, c solve, then the clinoplain that i-th observed result is determined is

π _i: ax+by-z+c=0(formula 4.1-6)

Itself and z0 plane intersection line L1 are:

$\left\{\begin{array}{c}\mathrm{ax}+\mathrm{by}+c=0\\ z=z_0\end{array}\right.$

Angle between L1 and x-axis

ε=atan(-a/b) (formula 4.1-7)

This plane normal and z-axis angle γ are

$\cos \mathrm{\γ}=\left|\frac{(a,b,-1)x\left(\mathrm{0,0,1}\right)}{\sqrt{a^2+b^2+1}}\right|=\frac{1}{\sqrt{a^2+b^2+1}}$ (formula 4.1-8)

Then

△ K=tan γ (formula 4.1-9)

△ K _x=△ Kcos (ε+pi/2) (formula 4.1-10)

△ K _y=△ Ksin (ε+pi/2) (formula 4.1-11)

Wherein

△ K _xfor this x-axis to slope change

△ Ky be this y-axis to slope change

△ K is the total slope change of this point.

Further, at least 16 observation points are set.

Further, think that difference is larger when the difference of described actual test value and calculated value numerical value is more than or equal to 10% of a less value in both numerical value.

The present invention is according to the above-mentioned △ K calculated _x, △ Ky and △ K slope change, contrast the gradient of actual building, when both numerical value are consistent, by inclined degree, soil digging correction carried out to building; When both numerical value difference are larger, check and find difference reason, repetition measurement, double calculation are consistent to both, carry out soil digging correction by inclined degree homogeneity value to building.

Beneficial effect of the present invention: the invention provides a kind of new soil digging correction monitoring and Numerical Methods, building inclination axle and each tilt quantity, settling amount put can be calculated, and determine the arrangement in follow-up soil digging amount and soil digging hole with this, thus work progress is optimized.By the science, the accuracy that invention increases soil digging correction, correction efficiency is higher, correction better quality, and this method proposes the method that digital quantization weighs inclined degree first, significant for soil digging deviation correcting technology.

Accompanying drawing explanation

Fig. 1 is an embodiment of existing building soil digging Deviation Correction Construction method for supervising of the present invention, and the ground of building arranges the arrangement diagram of multiple observation point;

Fig. 2 is that building is rectified a deviation, and relative initial plane π changes to the structural representation of π 1 plane, shows the intersection of two planes in figure;

Fig. 3 is the ground arrangement diagram of one embodiment of the invention building;

Fig. 4 is showing building former and later two positions in soil digging process, the elevational schematic view that horizontal direction is observed;

Fig. 5 is that display one embodiment calculates the building inclination face of gained and the intersection schematic diagram of initial plane π after observation;

Fig. 6 is one group of sloping shaft floor map that an embodiment draws as calculated afterwards;

Fig. 7 is an embodiment structure foundation plane correction change schematic diagram.

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention is described in further detail:

Embodiment 1, in the corner of structure foundation, corner and sudden change place, arranges 20 observation points, and by observation, the observation data of front 5 phases is as shown in table 1:

Table 1 example 1 observation data

Period	X	Y	Z1	Z2	Z3	Z4	Z5
								A1	158.400	103.518	10.0809	10.0760	10.0398	10.0250	10.0250
A2	159.140	101.300	10.1010	10.0948	10.0496	10.0312	10.0312
								A3	198.892	101.300	10.0749	10.0703	10.0368	10.0231	10.0151
A4	200.400	102.557	10.0622	10.0584	10.0306	10.0192	10.0112
								A5	200.400	116.249	9.9352	9.9392	9.9682	9.9800	9.9670
A6	198.892	117.300	9.9265	9.9310	9.9639	9.9773	9.9723
								A7	191.186	117.300	9.9319	9.9361	9.9665	9.9790	9.9799
A8	190.400	116.658	9.9380	9.9418	9.9695	9.9809	9.9828
								A9	189.702	113.259	9.9700	9.9718	9.9853	9.9907	9.9914
A10	185.210	113.259	9.9729	9.9746	9.9867	9.9917	9.9917
								A11	184.400	116.436	9.9440	9.9474	9.9725	9.9827	9.9842
A12	183.725	117.300	9.9364	9.9403	9.9688	9.9804	9.9824
								A13	175.144	117.300	9.9421	9.9456	9.9715	9.9821	9.9831
A14	174.400	115.951	9.9551	9.9578	9.9779	9.9861	9.9861
								A15	173.660	113.300	9.9802	9.9814	9.9902	9.9939	9.9948
A16	169.208	113.259	9.9831	9.9841	9.9917	9.9948	9.9958
								A17	168.400	116.475	9.9542	9.9570	9.9775	9.9859	9.9852
A18	167.406	117.300	9.9472	9.9504	9.9740	9.9837	9.9849
								A19	159.350	117.300	9.9524	9.9554	9.9766	9.9853	9.9853
A20	158.400	116.255	9.9628	9.9651	9.9817	9.9885	9.9885

Note: 1. in table, the unit of X, Y, Zi is m;

2. be the observation data of front 6 phases in table, with the Z1 phase for reference.

After calculating by the technology of the present invention method, the conclusion drawn is as follows:

Table 2 embodiment 1 result of calculation

	Z1	Z2	Z3	Z4	Z5
						a	0.000	0.000	0.000	0.000	0.000
b	0.000	0.001	0.005	0.006	0.007
						c	9.978	9.907	9.395	9.186	9.187
Kx(‰)	0.000	0.040	0.333	0.453	0.295
						Ky(‰)	0.000	0.568	4.717	6.412	6.641
Total K (‰)	0.000	0.570	4.729	6.428	6.647

The related conclusions drawn by table 2 is see seeing Fig. 6, Fig. 7

The difference maximum value of data and actual measurement is 9.2mm as calculated, and difference is 3%, is less than 10%, can think that data are reliable, namely presses calculated value and continues soil digging.

Embodiment 2, in the corner of structure foundation, corner and sudden change place, arranges 16 observation points, and by observation, the observation data of front 5 phases is as shown in table 2:

Table 3 embodiment 2 observation data

Period	X	Y	Z1	Z2	Z3	Z4	Z5
								A1	184.7863	128.5912	15.0398	15.0224	15.0180	15.0128	15.0087
A2	185.1013	126.6317	15.0496	15.0279	15.0225	15.0160	15.0109
								A3	224.7331	127.7570	15.0368	15.0207	15.0167	15.0118	15.0081
A4	225.7910	129.0991	15.0306	15.0172	15.0139	15.0098	15.0067
								A5	226.1995	142.3721	14.9682	14.9821	14.9856	14.9898	14.9930
A6	225.5165	143.9643	14.9639	14.9797	14.9836	14.9884	14.9921
								A7	217.6655	142.4591	14.9665	14.9812	14.9848	14.9892	14.9927
A8	216.5650	143.0229	14.9695	14.9829	14.9862	14.9902	14.9933
								A9	214.9326	138.4853	14.9853	14.9917	14.9933	14.9953	14.9968
A10	210.2731	138.7426	14.9867	14.9925	14.9940	14.9957	14.9971
								A11	209.4968	142.6816	14.9725	14.9845	14.9875	14.9912	14.9940
A12	210.1986	143.5231	14.9688	14.9824	14.9859	14.9900	14.9932
								A13	201.4223	143.4795	14.9715	14.9840	14.9871	14.9908	14.9938
A14	199.4374	141.7330	14.9779	14.9876	14.9900	14.9929	14.9952
								A15	200.0100	138.6697	14.9902	14.9945	14.9956	14.9969	14.9979
A16	194.2928	139.7977	14.9917	14.9953	14.9962	14.9973	14.9982

After calculating by the technology of the present invention method, the conclusion drawn is as follows: table 4 embodiment 2 result of calculation

	Z1	Z2	Z3	Z4	Z5
						a	0.000	0.000	0.000	0.000	0.000
b	0.000	0.002	0.002	0.003	0.004
						c	14.992	14.701	14.628	14.541	14.472
Kx(‰)	0.000	0.103	0.129	0.160	0.184
						Ky(‰)	0.000	1.976	2.470	3.062	3.527
Total K (‰)	0.000	1.978	2.473	3.067	3.531

The related conclusions drawn by table 2 is see seeing Fig. 6, Fig. 7.

The difference maximum value of data and actual measurement is 3.2mm as calculated, and difference is 4.5%, is less than 10%, can think that data are reliable, namely press calculated value and continue soil digging.

Also can show that example 1 is too fast in the rate of settling change of the 3rd, 4,5 phases by example 1,2 contrast, should less soil digging amount.

Claims (2)

1. an existing building soil digging Deviation Correction Construction method for supervising, is characterized in that:

Described method for supervising comprises and contrasting the actual test value of the building inclination in rectifying of leaned building process and calculated value, examines;

When both numerical value are consistent: by inclined degree, soil digging correction is carried out to building;

When the difference of both numerical value is more than or equal to 10% of a less value in both numerical value: check and find difference reason, repetition measurement, double calculation are consistent to both, carry out soil digging correction by inclined degree homogeneity value to building;

Until building to meet standard-required vertical;

Described actual test value is tested by the inclined degree of total powerstation to building;

Described calculated value obtains by following method and formula:

In the corner of structure foundation, corner and sudden change place, at least 10 observation points are set,

Inclination building rectification by horizontal control network is measured, measurement of the level records each settlement observation point plane coordinates and elevation, is set to A before correction starts ₁₁(x ₁₁, y ₁₁, z ₁₁), A ₁₂(x ₁₂, y ₁₂, z ₁₂) ... A _1n(x _1n, y _1n, z _1n), get the Z-direction value of relative initial observation coordinate

$z_0=\frac{1}{n}{\mathrm{\Σ}}_1^n{z}_{1i}$ (formula 4.1-1)

As the datum π 1 before correction,

Settlement observation point coordinates then after adjustment is A ₁₁(x ₁₁, y ₀₁, z ₀), A ₁₂(x ₁₂, y ₁₂, z ₀) ... A _1n(x _1n, y _1n, z ₀), their z have modified s1=z respectively to relief displacement ₁₁-z ₀, s2=z ₁₂-z ₀sn=z _1n-z ₀, s=(s1, s2 ... sn) ^tbe called index vector, wherein si moves down for just representing, and si is for negative representative moves, and so, the initial elevation of all settlement observation points is all corrected to an initial water plane π ₁(z=z ₀) on;

After correction starts, building is rectified a deviation, and relative initial plane changes to π i plane, if π i equation is:

π _i: a x+b y-z+c=0 (formula 4.1-2)

Construct a function F:

F＝[(z _i1-s1)-(a x _i1+b y _i1+c)] ²+[(z _i2-s2)-(a x _i2+b y _i2+c)] ²+……

[(z _in-sn)-(a x _in+ b y _in+ c)] ²(formula 4.1-3)

F gets minimum value season

$\frac{\∂F}{\∂a}=0;\frac{\∂F}{\∂b}=0;\frac{\∂F}{\∂c}=0$ (formula 4.1-4) solves

a∑x _ik ²+b∑x _ik*y _ik+c∑x _ik＝∑(z _ik-sk)*x _ik}

A ∑ x _ik* y _ik+ b ∑ y _ik ²+ c ∑ y _ik=∑ (z _ik-sk) * y _ik---(formula 4.1-5)

a∑x _ik+b∑y _ik+c*n＝∑(z _ik-sk)

Solve formula 4.1-5 ternary system of linear equations, if a, b, c solve, then the clinoplain that i-th observed result is determined is

π _i: ax+by-z+c=0 (formula 4.1-6)

Itself and z0 plane intersection line L1 are:

$\left\{\begin{array}{c}\mathrm{ax}+\mathrm{by}+c=0\\ z=z_0\end{array}\right.$

Angle between L1 and x-axis

ε=atan (-a/b) (formula 4.1-7)

This plane normal and z-axis angle γ are

$\cos \mathrm{\γ}=\left|\frac{(a,b,-1)\×\left(\mathrm{0,0,1}\right)}{\sqrt{a^2+b^2+1}}\right|=\frac{1}{\sqrt{a^2+b^2+1}}$ (formula 4.1-8)

Then

△ K=tan γ (formula 4.1-9)

△ K _x=△ Kcos (ε+pi/2) (formula 4.1-10)

△ K _y=△ Ksin (ε+pi/2) (formula 4.1-11)

Wherein

△ K _xfor this x-axis to slope change

△ Ky be this y-axis to slope change

△ K is the total slope change of this point.

2. existing building soil digging Deviation Correction Construction method for supervising according to claim 1, is characterized in that arranging at least 16 observation points.