CN103526783A - Method for measuring horizontal displacement of building foundation ditch - Google Patents

Abstract

The invention relates to a method for measuring the horizontal displacement of a building foundation ditch. A dipolar coordinate measurement method is adopted to collect angle distances of monitoring points, the coordinates of each monitoring point can be obtained through simple calculation, and the vertical distances from each monitoring point to a virtual benchmark line can be worked out rapidly and accurately through programs. The difference of the distances is the horizontal displacement of the foundation ditch. The method for measuring the horizontal displacement of the building foundation ditch is simple, is easy to implement, brings convenience to writing and batch processing of the programs, largely improves calculation efficiency, and lowers the error probability to the lowest extent.

Description

A kind of method of measuring building foundation pit horizontal movement

Technical field

The present invention is a kind of method of measuring building foundation pit horizontal movement, belongs to field of measuring technique.

Background technology

Current building, often with darker underground building, therefore first will carry out soil excavation before construction, the hole that soil excavation forms is building foundation pit.In order to ensure the safety in foundation pit construction process, need carry out displacement monitoring to foundation ditch.Past land utilization ratio is lower, the most regular shape of excavation of foundation pit, and this type of foundation ditch is in the computational process of Foundation Pit monitoring, and the coordinate figure that can directly relatively monitor is to calculate horizontal displacement.Along with expanding economy, land supply amount is fewer and feweri, the restriction that excavation of foundation pit is subject to surrounding enviroment also gets more and more, therefore comprise that the special shapes such as arc, triangle, turning obtain foundation ditch and also produce thus, the horizontal displacement monitoring point that this type of foundation ditch need be laid is more, when carrying out the calculating of Foundation Pit monitoring, need to synthesize the horizontal displacement that just can calculate monitoring point by coordinate vector, this vector synthetic parameters, each point is not identical, evaluation work is complicated, does not substantially possess the condition that the sequencing of realizing is calculated automatically.

Summary of the invention

The present invention designs for above-mentioned the deficiencies in the prior art a kind of method of measuring building foundation pit horizontal movement that provides just, its objective is the horizontal movement of measuring quickly and accurately building foundation pit.

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

This kind measured the method for building foundation pit horizontal movement, it is characterized in that: the step of the method is:

(1) utilize the horizontal movement datum mark (4) of two foundation ditches to set up an independently plane coordinate system, under this coordinate system, draw excavation of foundation pit line (1) and mark the coordinate position of the horizontal displacement monitoring point (2) of each foundation ditch, then along excavation of foundation pit line (1), be outwards offset 2～3 meters and form a virtual reference line (3) parallel with excavation of foundation pit line (1);

(2) in the horizontal movement datum mark (4) of a foundation ditch, set up 1 at the scene " level or the total powerstation (5) of above precision; sight the horizontal movement datum mark (4) of another foundation ditch; measure the angle β of the line of line between the horizontal movement datum mark (4) of two foundation ditches and the horizontal movement datum mark (4) of total powerstation (5) place foundation ditch and the horizontal displacement monitoring point (2) of each foundation ditch, the horizontal movement datum mark (4) of measurement total powerstation (5) place foundation ditch and the distance S between the horizontal displacement monitoring point (2) of each foundation ditch;

(3) the coordinate figure that calculates the horizontal displacement monitoring point (2) of each foundation ditch, design formulas is as follows:

$\left\{\begin{array}{c}{X}_i=X_0+S\·\cos \mathrm{\β}\\ Y_i=Y_0+S\·\sin \mathrm{\β}\end{array}\right.$ Formula 1

In formula: X _i, Y _ifor the coordinate figure of the horizontal displacement monitoring point (2) of each foundation ditch, X ₀, Y ₀coordinate figure for the horizontal movement datum mark (4) of total powerstation (5) place foundation ditch;

(4) calculate the horizontal displacement monitoring point (2) of foundation ditch to the vertical distance of virtual reference line (3), design formulas is as follows:

formula 2

D in formula _ifor the horizontal displacement monitoring point (2) of the foundation ditch vertical distance to virtual reference line (3),

,

for the starting point coordinate value of virtual reference line (3), X _i, Y _ifor the coordinate figure of the horizontal displacement monitoring point (2) of each foundation ditch, a is the azimuth of virtual reference line (3);

(5) horizontal displacement monitoring of foundation ditch point (2) to the variable quantity of the vertical distance of virtual reference line (3) is:

formula 3

D in formula _ibe the horizontal displacement monitoring point (2) of the i time foundation ditch to the vertical distance of virtual reference line (3),

be the horizontal displacement monitoring point (2) of the 1st foundation ditch to the vertical distance of virtual reference line (3), Δ D is Foundation Pit amount.

The feature of technical solution of the present invention is in coordinate system, virtual reference line (3) with excavation of foundation pit line parallel is set in the periphery of excavation of foundation pit line (1), horizontal displacement monitoring point (2) by the foundation ditch relatively therewith distance of reference line calculates the horizontal displacement of foundation ditch, and the method is simple, quick, accurate.Improved widely measurement efficiency.

Accompanying drawing explanation

Fig. 1 is to be the plane coordinate system that utilizes horizontal movement datum mark (4) foundation of two foundation ditches

Fig. 2 is in-site measurement schematic diagram

Fig. 3 is for calculating the flow chart of Foundation Pit

The specific embodiment

Below with reference to drawings and Examples, technical solution of the present invention is further described:

Shown in accompanying drawing 1～2, this kind measured the method for building foundation pit horizontal movement, it is characterized in that: the step of the method is:

(1) utilize the horizontal movement datum mark (4) of two foundation ditches to set up an independently plane coordinate system, under this coordinate system, draw excavation of foundation pit line (1) and mark the coordinate position of the horizontal displacement monitoring point (2) of each foundation ditch, then along excavation of foundation pit line (1), be outwards offset 2～3 meters and form a virtual reference line (3) parallel with excavation of foundation pit line (1);

(2) in the horizontal movement datum mark (4) of a foundation ditch, set up 1 at the scene " level or the total powerstation (5) of above precision; sight the horizontal movement datum mark (4) of another foundation ditch; measure the angle β of the line of line between the horizontal movement datum mark (4) of two foundation ditches and the horizontal movement datum mark (4) of total powerstation (5) place foundation ditch and the horizontal displacement monitoring point (2) of each foundation ditch, the horizontal movement datum mark (4) of measurement total powerstation (5) place foundation ditch and the distance S between the horizontal displacement monitoring point (2) of each foundation ditch;

(3) the coordinate figure that calculates the horizontal displacement monitoring point (2) of each foundation ditch, design formulas is as follows:

$\left\{\begin{array}{c}{X}_i=X_0+S\·\cos \mathrm{\β}\\ Y_i=Y_0+S\·\sin \mathrm{\β}\end{array}\right.$ Formula 1

In formula: X _i, Y _ifor the coordinate figure of the horizontal displacement monitoring point (2) of each foundation ditch, X ₀, Y ₀coordinate figure for the horizontal movement datum mark (4) of total powerstation (5) place foundation ditch;

(4) calculate the horizontal displacement monitoring point (2) of foundation ditch to the vertical distance of virtual reference line (3), design formulas is as follows:

formula 2

D in formula _ifor the horizontal displacement monitoring point (2) of the foundation ditch vertical distance to virtual reference line (3),

,

for the starting point coordinate value of virtual reference line (3), X _i, Y _ifor the coordinate figure of the horizontal displacement monitoring point (2) of each foundation ditch, a is the azimuth of virtual reference line (3);

(5) horizontal displacement monitoring of foundation ditch point (2) to the variable quantity of the vertical distance of virtual reference line (3) is:

formula 3

D in formula _ibe the horizontal displacement monitoring point (2) of the i time foundation ditch to the vertical distance of virtual reference line (3),

be the horizontal displacement monitoring point (2) of the 1st foundation ditch to the vertical distance of virtual reference line (3), Δ D is Foundation Pit amount.

Above-mentioned steps (3), (4), the calculating of (5) completes by programming software, this software utilizes VBA platform development to form.Its flow process as shown in Figure 3.In Fig. 3, the task that A completes, for setting up engineering, is inputted starting point coordinate, the orientation of the corresponding virtual reference line in each monitoring point of this engineering under coordinate system, and the coordinate of input level datum point to shift; B completes the importing of angle and distance observation; C completes the calculating of each Foundation Pit monitoring point coordinate figure; D completes Foundation Pit monitoring point to the distance of virtual reference line; E completes horizontal displacement and calculates; F derives the horizontal displacement calculating.

Along with city pace of construction with rapid changepl. never-ending changes and improvements, highrise building and underground construction have obtained developing rapidly, the importance of base pit engineering highlights day by day, the excavation form of foundation ditch and excavation shape are day by day complicated, by these computational methods, the evaluation work of displacement can be reduced greatly, in pit retaining monitoring work, play an important role.

Claims (1)

1. a method of measuring building foundation pit horizontal movement, is characterized in that: the step of the method is:

(1) utilize the horizontal movement datum mark (4) of two foundation ditches to set up an independently plane coordinate system, under this coordinate system, draw excavation of foundation pit line (1) and mark the coordinate position of the horizontal displacement monitoring point (2) of each foundation ditch, then along excavation of foundation pit line (1), be outwards offset 2～3 meters and form a virtual reference line (3) parallel with excavation of foundation pit line (1);

(2) in the horizontal movement datum mark (4) of a foundation ditch, set up 1 at the scene " level or the total powerstation (5) of above precision; sight the horizontal movement datum mark (4) of another foundation ditch; measure the angle β of the line of line between the horizontal movement datum mark (4) of two foundation ditches and the horizontal movement datum mark (4) of total powerstation (5) place foundation ditch and the horizontal displacement monitoring point (2) of each foundation ditch, the horizontal movement datum mark (4) of measurement total powerstation (5) place foundation ditch and the distance S between the horizontal displacement monitoring point (2) of each foundation ditch;

(3) the coordinate figure that calculates the horizontal displacement monitoring point (2) of each foundation ditch, design formulas is as follows:

$\{\begin{array}{c}{X}_i=X_0+S\·\cos \mathrm{\β}\\ Y_i=Y_0+S\·\sin \mathrm{\β}\end{array}$ Formula 1

In formula: X _i, Y _ifor the coordinate figure of the horizontal displacement monitoring point (2) of each foundation ditch, X ₀, Y ₀coordinate figure for the horizontal movement datum mark (4) of total powerstation (5) place foundation ditch;

(4) calculate the horizontal displacement monitoring point (2) of foundation ditch to the vertical distance of virtual reference line (3), design formulas is as follows:

formula 2

D in formula _ifor the horizontal displacement monitoring point (2) of the foundation ditch vertical distance to virtual reference line (3),

,

for the starting point coordinate value of virtual reference line (3), X _i, Y _ifor the coordinate figure of the horizontal displacement monitoring point (2) of each foundation ditch, a is the azimuth of virtual reference line (3);

(5) horizontal displacement monitoring of foundation ditch point (2) to the variable quantity of the vertical distance of virtual reference line (3) is:

formula 3

D in formula _ibe the horizontal displacement monitoring point (2) of the i time foundation ditch to the vertical distance of virtual reference line (3),

be the horizontal displacement monitoring point (2) of the 1st foundation ditch to the vertical distance of virtual reference line (3), Δ D is Foundation Pit amount.

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