CN203420265U

CN203420265U - System for monitoring deformation of edge of foundation ditch

Info

Publication number: CN203420265U
Application number: CN201320458617.9U
Authority: CN
Inventors: 陈立生; 孔祥鹏; 胡劲松; 邵亮; 陈介华; 蒋国标; 沈家毅
Original assignee: Shanghai Urban Construction Municipal Engineering Group Co Ltd
Current assignee: Shanghai Urban Construction Municipal Engineering Group Co Ltd
Priority date: 2013-07-30
Filing date: 2013-07-30
Publication date: 2014-02-05
Anticipated expiration: 2023-07-30

Abstract

The utility model relates to the technology of monitoring the deformation of a foundation ditch, in particular to a system for monitoring the deformation of the edge of the foundation ditch. The system for monitoring the deformation of the edge of the foundation ditch is characterized by comprising a monitoring point prism, a total station and a datum point prism, wherein the monitoring point prism is arranged in a deformation-to-be-detected area at the edge of the foundation ditch, the total station is arranged on the ground outside the edge of the foundation ditch, and the datum point prism is arranged on a stable building outside the foundation ditch. The system for monitoring the deformation of the edge of the foundation ditch has the advantages of being low in cost of measurement equipment, easy and convenient to operate, high in measuring accuracy, and capable of being popularized and applied to foundation ditch projects in a large scale.

Description

A kind of monitoring system of margin of foundation pit distortion

Technical field

The utility model relates to foundation pit deformation monitoring technology, is specifically related to a kind of monitoring system of margin of foundation pit distortion.

Background technology

Along with the high speed development of urban construction, in each metropolis, the underground space Yi world of all kinds of purposes, obtain development and utilization, produced thus a large amount of base pit engineerings.Deep pit digging is a complicated system engineering, at support reinforcement and precipitation, improperly in situation, often can exceed design load because of the ground settlement of margin of foundation pit and jeopardize the normal use of various structure around, as breaking of underground municipal pipeline; The inclination of Adjacent Buildings, cracking even collapse; Road ftractures, sinks and the normal use of impact.

Therefore the deformation monitoring for margin of foundation pit seems particularly, and existing monitoring method mainly contains following several:

1. on the some important monitoring position at margin of foundation pit place, be provided with photosensitive displacement signal monitor, on the stable soil body outside foundation ditch, some laser instruments are set simultaneously, each laser instrument is corresponding one by one with each photosensitive displacement signal monitor, the laser beam sending from laser instrument is emitted in photosensitive displacement signal monitor, when laser beam, in photosensitive displacement signal monitor, off normal occurs, margin of foundation pit generation sedimentation and deformation is described.The advantage of this method is can Real-Time Monitoring, and precision is higher, and its shortcoming is that equipment cost is higher, is not suitable for large-scale promotion application.

2. on the some important monitoring position at margin of foundation pit place, prism is set, on the ground outside foundation ditch, total powerstation is set simultaneously, by total powerstation, observe settling amount and the horizontal movement value at place, prism place.The shortcoming of this method is that the total powerstation place of setting up is subject to the soil disturbance impact of foundation pit construction, and measured value exists error, and precision is lower.

Given this, a kind of monitoring system of measuring the margin of foundation pit distortion that cost is lower, precision is higher is badly in need of seeking in this area.

Summary of the invention

The purpose of this utility model is according to above-mentioned the deficiencies in the prior art part, a kind of monitoring system of margin of foundation pit distortion is provided, this monitoring system by arranging some monitoring points prism in margin of foundation pit deformed region to be measured, and by total powerstation, observe obtaining deformation of sedimentation and the horizontal displacement of margin of foundation pit, by at the architectural reference point prism that arranges of stablizing of foundation ditch, with margin of foundation pit deformation of sedimentation and horizontal displacement to obtaining, revise simultaneously.

The utility model object realizes and being completed by following technical scheme:

A kind of monitoring system of margin of foundation pit distortion, it is characterized in that described monitoring system comprises monitoring point prism, total powerstation and reference point prism, described monitoring point prism is arranged in described margin of foundation pit deformed region to be measured, described total powerstation is arranged on the ground location beyond described margin of foundation pit, described reference point prism be arranged at outside described foundation ditch stablize architectural.

Described monitoring point prism is evenly spaced apart along described margin of foundation pit.

The utility model has the advantages that, measureing equipment cost is lower, easy and simple to handle, and certainty of measurement is high, can be in base pit engineering large-scale promotion application.

Accompanying drawing explanation

Fig. 1 is that monitoring system of the present utility model forms schematic diagram.

The specific embodiment

Below in conjunction with accompanying drawing, by embodiment, feature of the present utility model and other correlated characteristic are described in further detail, so that technician's of the same trade understanding:

As Fig. 1, in figure, mark 1-7 is respectively: prism 1, foundation ditch 2, support 3, total powerstation 4, stable building 5, prism 6, fender post 7.

Embodiment: as shown in Figure 1, in base pit engineering, due to factor impacts such as excavation off-load, the earth sedimentation, constructions, will inevitably there is certain distortion in foundation ditch, and sedimentation will occur at the top of foundation ditch, to there is sidesway in foundation pit side-wall, uplift of soil phenomenon will occur in the bottom of foundation ditch.In order effectively to control the deflection of foundation ditch 2, in foundation ditch 2, be provided with fender post 7, and steel support 3 is set between the sidewall of foundation ditch 2, to provide certain side direction to prop up a grade power to the sidewall of foundation ditch 2.In order to understand in time the deflection data of foundation ditch 2, think that Construction Decision provides reference information simultaneously, in foundation ditch 2, be outside equipped with for measuring the monitoring system of margin of foundation pit distortion.

As shown in Figure 1, above-mentionedly for measuring the monitoring system of margin of foundation pit distortion, by prism 1, total powerstation 4 and prism 6, formed, because sedimentation and deformation more easily occurs for the top of foundation ditch 2, therefore, along the selected some points to be monitored of top of foundation ditch 2, on each point to be monitored, set up prism 1; The selected working terminal in a distance outside the edge apart from foundation ditch 2, total powerstation 4 is set on this working terminal, total powerstation 4 keeps intervisibility with each prism 1, and because working terminal is nearer apart from foundation ditch 2, the construction in foundation ditch 2 will be located the soil body to this and bring certain disturbance; In order to ensure the accuracy of measuring, in the stable building 5 apart from foundation ditch 2 farther places, a selected reference point sets up prism 6 on this reference point, guarantees that prism 6 and total powerstation 4 keep intervisibility, wherein stablely building 5 and not affected by the construction in foundation ditch 2, can there is not disturbance deformation in the soil body.

As shown in Figure 1, be below the concrete use step of this monitoring system:

1. by the horizontal coordinate (X of working terminal _{working terminal}, Y _{working terminal}) and the height value H of total powerstation 4 _{working terminal}in input total powerstation 4;

2. by the height value H of reference point _{reference point}and horizontal coordinate (X _{reference point}, Y _{reference point}) input in described total powerstation 4;

3. a monitoring point in selected some points to be monitored, makes total powerstation 4 aim at the prism 1 of locating this monitoring point and measures, to obtain the initial height value H of prism 1 ₀and initial level coordinate (X ₀, Y ₀);

4. due to total powerstation 4, be arranged on the peripheral edge of foundation ditch 2, be subject to construction infection larger, conventionally at this place, can there is sedimentation situation, larger error for fear of follow-up measurement, need each before the prism 1 on monitoring point is measured, the deformation of sedimentation that records total powerstation 4, is specially: the prism 6 that total powerstation 4 is aimed on reference point is measured, to obtain the now height value H ' of total powerstation 4 _{working terminal}and horizontal coordinate (X ' _{working terminal}, Y ' _{working terminal}), and calculate variation delta H and the horizontal movement deflection (Δ X, Δ Y) of total powerstation 4 height value;

5. at regular intervals, height value and horizontal coordinate to this place, monitoring point are measured, and are specially: total powerstation 4 alignment prisms 1 are measured, to obtain prism 1 height value Hn and horizontal coordinate (Xn thereof now, Yn), calculate afterwards the height value Hn and initial height value H of prism 1 ₀difference, this difference is the deformation of sedimentation Δ H of this monitoring point _{monitoring point}, the horizontal coordinate (Xn, Yn) of simultaneously calculating prism 1 and initial level coordinate (X ₀, Y ₀) difference, this difference is horizontal movement deflection (the Δ X of this monitoring point _{monitoring point}, Δ Y _{monitoring point});

6. because there is sedimentation and deformation at working terminal place, therefore need to be according to the variation delta H of the total powerstation height value at working terminal place and horizontal movement deflection (Δ X, Δ Y) measured value at this place, monitoring point is revised, the actual deformation of sedimentation at this place, monitoring point is Δ H _{monitoring point}+ Δ H, the real standard displacement deformation amount at this place, monitoring point is (Δ X _{monitoring point}+ Δ X, Δ Y _{monitoring point}+ Δ Y);

7. according to above-mentioned steps 3.～6. described in, to remaining monitoring point, adopt identical method to measure, finally to obtain the bulk deformation spirogram table of the edge of foundation ditch 2.

Claims

1. the monitoring system of margin of foundation pit distortion, it is characterized in that described monitoring system comprises monitoring point prism, total powerstation and reference point prism, described monitoring point prism is arranged in described margin of foundation pit deformed region to be measured, described total powerstation is arranged on the ground location beyond described margin of foundation pit, described reference point prism be arranged at outside described foundation ditch stablize architectural.

2. the monitoring system of a kind of margin of foundation pit distortion according to claim 1, is characterized in that described monitoring point prism is evenly spaced apart along described margin of foundation pit.