CN103363904B - The measurement mechanism of foundation pit enclosure structure layering horizontal shift and measuring method - Google Patents

The measurement mechanism of foundation pit enclosure structure layering horizontal shift and measuring method Download PDF

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CN103363904B
CN103363904B CN201310261855.5A CN201310261855A CN103363904B CN 103363904 B CN103363904 B CN 103363904B CN 201310261855 A CN201310261855 A CN 201310261855A CN 103363904 B CN103363904 B CN 103363904B
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displacement
laser range
range sensor
measurement mechanism
foundation pit
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CN103363904A (en
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夏才初
张平阳
曾格华
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SHANGHAI TONGJIAN BUILDING TECHNOLOGY Co Ltd
Tongji University
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SHANGHAI TONGJIAN BUILDING TECHNOLOGY Co Ltd
Tongji University
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Abstract

The invention provides a kind of measurement mechanism and measuring method of foundation pit enclosure structure layering horizontal shift, this measurement mechanism comprises a relative displacement measurement mechanism and an absolute displacement measuring apparatus, the displacement reflecting piece that relative displacement measurement mechanism comprises the first alignment device be fixedly mounted on the first building enclosure side, is arranged on the first laser range sensor on the first alignment device and is arranged in the second building enclosure.Absolute displacement measuring apparatus comprises the second alignment device be fixedly mounted on the first building enclosure end face, is arranged on the second laser range sensor on the second alignment device and the benchmark reflecting piece outside a foundation ditch.First, second alignment device includes in one the pedestal ball-and-socket and a bulb rotor mating spherical surfaces that are provided with ball-and-socket, and bulb rotor is fixedly connected with first, second laser range sensor, is provided with locking device between ball-and-socket and bulb rotor.Measurement mechanism structure is simple, measuring process is simple and efficient, measuring method measuring accuracy is high.

Description

The measurement mechanism of foundation pit enclosure structure layering horizontal shift and measuring method
Technical field
The present invention relates to a kind of device and method measured for the horizontal shift of base pit engineering building enclosure different depth place.Particularly relating to a kind of foundation pit enclosure structure both sides is measurement mechanism and the measuring method that foundation pit enclosure structure horizontal shift is carried out in substantially parallel situation lower leaf.
Background technology
In Foundation Pit Construction process, the horizontal shift at foundation pit enclosure structure different depth place is the primary evaluation index of base pit engineering security, because of but main monitoring project in foundation pit construction process.
The place's horizontal shift of foundation pit enclosure structure different depth is generally measured with tiltmeter by bury inclinometer pipe underground in building enclosure after.Inclinometer pipe buries complexity underground, measurement cost is high, measurement result is unstable, so precision is difficult to ensure.Also have both at home and abroad some to carry out surveys quantifier elimination based on laser distance measuring principle to the horizontal shift at foundation pit enclosure structure different depth place, the device that these researchs relate to all has more complicated structure, or larger size.During whole measurement, all need the stationary installation of laser range sensor to be arranged on every one deck foundation pit enclosure structure, be easy to be subject to blasting vibration and mechanical collision, thus affect measuring accuracy, measurement mechanism even also may be made to be broken.In addition, some laser range sensors limit due to the structure by stationary installation, be equipped with particular requirement, otherwise Laser emission end cannot find impact point to be measured to the installation position of measuring point and instrument.Because when measuring, every bar survey line all will install corresponding laser range finder stationary installation, consumption is large, and costly, thus not having can widespread use in engineering reality.
The measuring method of existing foundation pit enclosure structure layering horizontal shift mainly contains axis method, minor angle method, total station instrument coordinate method of changing etc., first two method adopts transit and steel ruler to measure, total station instrument coordinate method of changing, by total powerstation Simultaneously test angle and distance, utilizes reduction formula to calculate the horizontal shift value of foundation pit enclosure structure.Various measuring method has certain drawback above, axis method and minor angle method higher to site requirements, the basic point of its surveying work to be selected in distance foundation ditch nearby, substantially motionless in Excavation Process point, if the distance of basic point choice is longer, the steel ruler reading accuracy read from transit is just lower.Although total station instrument coordinate method of changing measuring accuracy is high, its measuring process is loaded down with trivial details, measures cost high.
Summary of the invention
The shortcoming of prior art in view of the above, the technical problem to be solved in the present invention is to provide the measurement mechanism of a kind of structure foundation pit enclosure structure layering horizontal shift simple, easy for installation and measuring process is simple and efficient, measurement result precision is high measuring method.
For achieving the above object and other relevant objects, the invention provides a kind of measurement mechanism of foundation pit enclosure structure layering horizontal shift, described foundation pit enclosure structure comprises the first building enclosure and the second building enclosure that are positioned at foundation ditch both sides, and first, second building enclosure described includes collar tie beam and enclosure wall.Measurement mechanism provided by the invention comprises a relative displacement measurement mechanism and an absolute displacement measuring apparatus, the displacement reflecting piece that described relative displacement measurement mechanism comprises the first alignment device be fixedly mounted on the first building enclosure side, is arranged on the first laser range sensor on described first alignment device and is arranged in the second building enclosure; Described absolute displacement measuring apparatus comprises the second alignment device be fixedly mounted on the first building enclosure end face, be arranged on the second laser range sensor on the second alignment device and a benchmark reflecting piece, benchmark reflecting piece is fixedly installed on the datum of described first building enclosure side, first, second alignment device described includes a pedestal, a ball-and-socket is provided with in pedestal, ball-and-socket and a bulb rotor mating spherical surfaces, bulb rotor is fixedly connected with first, second laser range sensor described, is also provided with locking device between described ball-and-socket and described bulb rotor.
Preferably, bulb rotor is fixed with screw, is connected by described screw between first, second laser range sensor described with described bulb rotor.
Preferably, described locking device is be installed in the lock-screw on described pedestal, and the head of described lock-screw exposes to described pedestal, and the afterbody of described lock-screw stretches in described ball-and-socket.
Preferably, described first alignment device is fixedly mounted on the side of the collar tie beam of described first building enclosure by the first setscrew; Described second alignment device is fixedly mounted on by the second setscrew on the end face of the collar tie beam of described first building enclosure.
Preferably, the end of first, second setscrew described all has screw thread, and described screw thread has regular length.
Preferably, first, second laser range sensor described is all connected with external triggering line and external trigger button.
Preferably, described reference point is more than or equal to 5 times of the described excavation of foundation pit degree of depth to the distance of described second laser range sensor.
The present invention also provides a kind of measuring method of foundation pit enclosure structure layering horizontal shift, comprise the following steps: selected reference point, using described second laser range sensor installation place as benchmark measuring point, the distance value l of described reference point to described benchmark measuring point is measured according to survey frequency with the second laser range sensor, according to survey frequency, each measured value l jwith first measured value l 0difference be the abswolute level shift value Δ l of described benchmark measuring point j, Δ l j=| l j-l 0|, wherein j represents pendulous frequency, j=0,1,2
Using the installation place of described first laser range sensor as working base point, along with the excavation of each layer of described foundation ditch, the corresponding each layer of described second building enclosure installs described displacement reflecting piece successively, using described displacement reflecting piece installation place as displacement measuring points, measure the distance value l of described working base point to each described displacement measuring points with described first laser range sensor according to described survey frequency and the excavation number of plies ij, wherein i represents the excavation number of plies; Each measured value l ijwith first measured value l i0difference DELTA l ij=| l ij-l i0| the described displacement measuring points being projected as i-th layer is on a horizontal to the relative horizontal displacement value δ of described working base point ij, δ ij=Δ l ijsin θ i, wherein h ifor excavation is to the degree of depth of foundation ditch when i-th layer;
The displacement measuring points of described i-th layer is to the relative horizontal displacement value δ of described working base point ijwith the abswolute level shift value Δ l of described benchmark measuring point jdifference be the abswolute level displacement S of the displacement measuring points of described i-th layer ij, S ij=| δ ij-Δ l j|.
Preferably, measuring method also comprises the described displacement measuring points of the described i-th layer relative horizontal displacement value δ to described working base point ijmodification method: make δ ij'=δ ij+ δ i-1, k, wherein, δ ij' be modified value; I=2,3, K is the distance value l of described displacement measuring points to described working base point of first described i-th layer of measurement i0time, to the pendulous frequency of the i-th-1 layer; δ i-1, kfor at the distance value l of the first described displacement measuring points measuring i-th layer to described working base point i0time, the described displacement measuring points of the i-th-1 layer is relative to the relative horizontal displacement value of described working base point.
As mentioned above, the measurement mechanism of foundation pit enclosure structure layering horizontal shift of the present invention and measuring method, have following beneficial effect:
1. laser range sensor is arranged on the measuring point of foundation pit enclosure structure by a dismountable alignment device, alignment device structure is simple, convenient to install and measure at any time, measurement mechanism is avoided to be damaged, all do not affect foundation ditch normal construction when installing and measure, the measurement mechanism of whole foundation pit enclosure structure layering horizontal shift is easy to apply;
2. measure according to excavation of foundation pit Depth Stratification, and consider the horizontal shift value that last layer has occurred when measuring this layer of horizontal shift measuring point, measurement result is revised, make measurement result more accurate reliable;
3. form point cantact between the ball-and-socket of alignment device and bulb rotor, efficiently solve typical measuring arrangements install after due to the face between surveying instrument with stationary installation contact with cause during button contact the problems such as the measurement result poor stability that causes and poor repeatability compared with big error and face.
Accompanying drawing explanation
Fig. 1 is shown as the schematic diagram of foundation pit enclosure structure layering horizontal shift measurement mechanism of the present invention and the schematic diagram of measuring method.
Fig. 2 is shown as the close-up schematic view of the measurement mechanism of foundation pit enclosure structure layering horizontal shift of the present invention.
Fig. 3 is shown as the schematic diagram revising the relative horizontal displacement value of each layer displacement measuring points in the measuring method of foundation pit enclosure structure layering horizontal shift of the present invention.
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Refer to accompanying drawing 1 to accompanying drawing 3.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Figure 1 shows that the schematic diagram of measurement mechanism provided by the invention, this measurement mechanism is for measuring foundation pit enclosure structure layering horizontal shift.As shown in Figure 1, foundation pit enclosure structure 4 comprise be arranged in foundation ditch 1 both sides first building enclosure 41(Fig. 1 display be arranged in left side building enclosure) and second building enclosure 42(Fig. 1 display be positioned on the right side of building enclosure), the first building enclosure 41 and the second building enclosure 42 include collar tie beam 411 and enclosure wall 412.This measurement mechanism comprises a relative displacement measurement mechanism 21 and an absolute displacement measuring apparatus 22.
Relative displacement measurement mechanism 21 comprises the first alignment device 211, first laser range sensor 212 and multiple displacement reflecting piece 213.First alignment device 211 is fixedly mounted on the side of the first building enclosure 41, and the first laser range sensor 212 is arranged on the first alignment device 211, and each displacement reflecting piece 213 is arranged in the second building enclosure 42.
Absolute displacement measuring apparatus 22 comprises the second alignment device 221, second laser range sensor 222 and benchmark reflecting piece 223.Second alignment device 221 is fixedly mounted on the end face of the first building enclosure 41, and the second laser range sensor 222 is arranged on the second alignment device 221, and benchmark reflecting piece 223 is fixedly installed on reference point 31 place of the first building enclosure 41 side.The distance l of reference point 31 to the second laser range sensor 222 is more than or equal to 5 times of foundation ditch 1 cutting depth h, i.e. l >=5h.
Fig. 2 is shown as the close-up schematic view of the measurement mechanism of foundation pit enclosure structure layering horizontal shift of the present invention, as shown in Figure 2, first alignment device 211 and the second alignment device 221 include a pedestal 23, a ball-and-socket 231 is provided with in pedestal 23, ball-and-socket 231 and a bulb rotor 232 form mating spherical surfaces, bulb rotor 232 is fixedly connected with the second laser range sensor 222 with the first laser range sensor 212, is provided with locking device 24 between ball-and-socket 231 and bulb rotor 232.In embodiment, locking device 24 is for being installed in the lock-screw 241 on pedestal 23, and the head 2411 of lock-screw 241 exposes to pedestal 23, and the afterbody 2412 of lock-screw 241 stretches in ball-and-socket 231.
Bulb rotor 232 is fixed with screw 2321, first laser range sensor 212 and the second laser range sensor 222 are provided with the threaded hole 2121 coordinated with screw 2321, the first laser range sensor 212, second laser range sensor 222 can be linked together with bulb rotor 232 with coordinating of threaded hole 2121 by screw 2321.First alignment device 211 is fixedly mounted on the side of the first building enclosure 41 collar tie beam 411 by the first setscrew 214, and the second alignment device 221 is fixedly mounted on the end face of the first building enclosure 41 collar tie beam 411 by the second setscrew 224.The end of the first setscrew 214 and the second setscrew 224 all has screw thread 25, and screw thread 25 length is fixed, and just in time coordinates with the threaded hole 233 of pedestal 23 one end, makes alignment device can be fixedly secured to same position at every turn, ensure that higher alignment precision.
When measuring foundation pit enclosure structure layering horizontal shift, what a fixed reference point 31 is determined on request outside the foundation ditch of first building enclosure 41 the same side, benchmark reflecting piece 223 is arranged at this reference point 31 place, the second alignment device 221 being connected with the second laser range sensor 222 is installed on the second setscrew 224, the elevation of benchmark reflecting piece 223 and the Installation Elevation of the second alignment device 221 basically identical, form absolute displacement measuring apparatus 22.Using the installation place of the second laser range sensor 222 as benchmark measuring point 32.
Relative with the first setscrew 214, a displacement measuring points 341 is determined in collar tie beam 411 side of the second building enclosure 42, install a displacement reflecting piece 213, the first alignment device 211 being connected with the first laser range sensor 212 is installed on the first setscrew 214, using the installation place of the first laser range sensor 212 as working base point 33, form relative displacement measurement mechanism 21.
The reflective surface of displacement reflecting piece 213 or benchmark reflecting piece 223 is all tried one's best the laser survey line launched perpendicular to the first laser range sensor 212 or the second laser range sensor 222.The angle of the first laser range sensor 212 or the second laser range sensor 222 Laser emission can be adjusted arbitrarily by roating sphere head rotor 232, realize the accurate alignment of survey line between measuring point.After laser emission point being sighted the central authorities of displacement reflecting piece 213 or benchmark reflecting piece 223, the head 2411 of rotational lock screw 241, make the afterbody 2412 of lock-screw 241 be deep into ball-and-socket 231 inside and hold out against bulb rotor 232, thus locking the first laser range sensor 212 or the second laser range sensor 222, fixed laser emission angle.Owing to forming point cantact between ball-and-socket 231 and bulb rotor 232, efficiently solve after conventional laser distance measuring sensor is installed and contact the problems such as the measurement result poor stability that causes and poor repeatability due to the face between surveying instrument with stationary installation.
First laser range sensor 212 and the second laser range sensor 222 are all connected with external triggering line and external trigger button, the measuring error that the flip flop equipment can eliminating direct contact type causes when button.When laser spots sights benchmark reflecting piece 223 or displacement reflecting piece 213 central, press external trigger button record reading.First laser range sensor 212 and the second laser range sensor 222 pairs of measurement results have numbering memory function and clock timing function, have enough internal memories, and data-interface can by data importing computer, and data resolution is 0.1mm.
Present invention also offers the measuring method adopting above-mentioned measurement mechanism to carry out foundation pit enclosure structure layering horizontal shift measurement.Fig. 1 is shown as the schematic diagram of this measuring method.
With the second laser range sensor 222 according to the distance value l of survey frequency measuring basis measuring point 32 to reference point 31 j, according to survey frequency, each measured value l jwith first measured value l 0difference be the abswolute level shift value Δ l of benchmark measuring point 32 j, Δ l j=| l j-l 0|, wherein j represents pendulous frequency, j=0,1,2 ...In embodiment, survey frequency is once a day.
Along with the excavation of each layer of foundation ditch 1, the corresponding each layer of second building enclosure 42 installs displacement reflecting piece 213 successively, using displacement reflecting piece 213 installation place as displacement measuring points 34, arrive the distance value l of each displacement measuring points 34 according to survey frequency and excavation number of plies difference surveying work basic point 33 with the first laser range sensor 212 ij, wherein, i represents the excavation number of plies.The measured value l at every turn obtained ijwith first measured value l i0difference DELTA l ij=| l ij-l i0| the relative horizontal displacement value δ of displacement measuring points when i-th layer 34 to working base point 33 is excavated in being projected as on a horizontal ij.
During the ground floor 11 of excavation pit 1, displacement measuring points 341 is arranged on inside the collar tie beam 411 of the second building enclosure 42, relative with the first setscrew 214 of the first building enclosure 41 collar tie beam 411 side, adjust the bulb rotor 232 be connected on the first laser range sensor 212, make laser emission point sight displacement reflecting piece 213, record the distance value of displacement measuring points 341 to working base point 33.Collar tie beam not can think the rigid body deformed, and therefore each measured value is a definite value l 1.
Excavation is to the second layer 12, third layer 13 successively ... time, inside the enclosure wall 412 of the second building enclosure 42, displacement reflecting piece 213 is laid in relevant position, forms displacement measuring points 342,343 ...As shown in Figure 1, h ifor excavation is to the degree of depth of foundation ditch 1 when i-th layer.The θ of i-th layer during owing to measuring at every turn ivariable quantity is very little, can think δ ij=Δ l ijsin θ i.
Benchmark measuring point 32 and working base point 33 are all set on the collar tie beam of the first building enclosure 41, and collar tie beam is rigid body, so benchmark measuring point 32 and working base point 33 have identical abswolute level shift value Δ l j.
Each displacement measuring points 34 is to the relative horizontal displacement value δ of working base point 33 ijwith the abswolute level shift value Δ l of benchmark measuring point 32 jdifference be the abswolute level displacement S of the displacement measuring points 34 of i-th layer ij, S ij=| δ ij-Δ l j|.
Such as, when excavation is to third layer 13, each third layer 13 displacement measuring points 343 measured is to the relative horizontal displacement value δ of working base point 33 3j=Δ l 3jsin θ 3, Δ l 3j=| l 3j-l 30|.The abswolute level displacement S of third layer 13 displacement measuring points 343 3j=| δ 3j-Δ l j|.
First laser range sensor 212 is identical laser range sensors with the second laser range sensor 222, therefore in an embodiment, first laser range sensor 212 and the second laser range sensor 222 can exchange, and are measuring the distance value l of benchmark measuring point 32 to reference point 31 with the second laser range sensor 222 jafter, the second laser range sensor 222 is pulled down from the second alignment device 221, then is installed on the first alignment device 211, for the distance value l of surveying work basic point 33 to each displacement measuring points 34 ij.Only use a laser range sensor also can complete measurement in whole measuring process.
As shown in figures 1 and 3, more than the relative horizontal displacement and abswolute level displacement that record after displacement reflecting piece 213 laying of each displacement measuring points 34, due to the stage excavation of foundation ditch 1 soil body, lay front foundation pit enclosure structure 4 at displacement measuring points 34 and just there occurs certain horizontal shift, therefore, can revise the relative horizontal displacement value recorded from the second layer 12 excavates with following methods:
Make δ ij'=δ ij+ δ i-1, k, wherein, i=2,3, K is the distance value l that the first displacement measuring points 34 measuring i-th layer arrives working base point 33 i0time, to the number of times that the i-th-1 layer is measured; δ ij' be modified value; δ i-1, kfor arriving the distance value l of working base point 33 at the first displacement measuring points 34 measuring i-th layer i0time, the displacement measuring points 34 of the i-th-1 layer is relative to the relative horizontal displacement value of working base point 33.
Such as, excavation to third layer 13, safeguard wall lays third layer 13 displacement measuring points 343 time, enclosure wall 412 there occurs horizontal shift, at the first distance value l of displacement measuring points 343 to working base point 33 measuring third layer 13 30time, 5 times are carried out to the displacement measuring points 342 of the second layer 12 and has measured, obtained the horizontal shift value δ of displacement measuring points 342 relative to working base point 33 of the second layer 12 25, therefore modified value δ 3j'=δ 3j+ δ 25.
In sum, the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.

Claims (9)

1. the measurement mechanism of a foundation pit enclosure structure layering horizontal shift, described foundation pit enclosure structure (4) comprises the first building enclosure (41) and the second building enclosure (42) that are positioned at foundation ditch (1) both sides, described first, second building enclosure (41, 42) collar tie beam (411) and enclosure wall (412) is included, it is characterized in that: described measurement mechanism comprises a relative displacement measurement mechanism (21) and an absolute displacement measuring apparatus (22), described relative displacement measurement mechanism (21) comprises the first alignment device (211) be fixedly mounted on the first building enclosure (41) side, the displacement reflecting piece (213) being arranged on the first laser range sensor (212) on described first alignment device (211) and being arranged in the second building enclosure (42), described absolute displacement measuring apparatus (22) comprises the second alignment device (221) be fixedly mounted on the first building enclosure (41) end face, be arranged on the second laser range sensor (222) on the second alignment device (221) and a benchmark reflecting piece (223), benchmark reflecting piece (223) is fixedly installed on reference point (31) place of described first building enclosure (41) side, described first, second alignment device (211, 221) pedestal (23) is included, a ball-and-socket (231) is provided with in pedestal (23), ball-and-socket (231) and bulb rotor (232) mating spherical surfaces, bulb rotor (232) and described first, second laser range sensor (212, 222) be fixedly connected with, locking device (24) is also provided with between described ball-and-socket (231) and described bulb rotor (232).
2. the measurement mechanism of foundation pit enclosure structure layering horizontal shift according to claim 1, it is characterized in that: bulb rotor (232) is fixed with screw (2321), be connected by described screw (2321) between first, second laser range sensor described (212,222) with described bulb rotor (232).
3. the measurement mechanism of foundation pit enclosure structure layering horizontal shift according to claim 1, it is characterized in that: described locking device (24) is for being installed in the lock-screw (241) on described pedestal (23), the head (2411) of described lock-screw (241) exposes to described pedestal (23), and the afterbody (2412) of described lock-screw stretches in described ball-and-socket (231).
4. the measurement mechanism of foundation pit enclosure structure layering horizontal shift according to claim 1, is characterized in that: described first alignment device (211) is fixedly mounted on the side of the collar tie beam (411) of described first building enclosure (41) by the first setscrew (214); Described second alignment device (221) is fixedly mounted on by the second setscrew (224) on the end face of the collar tie beam (411) of described first building enclosure (41).
5. the measurement mechanism of foundation pit enclosure structure layering horizontal shift according to claim 4, it is characterized in that: the end of first, second setscrew described (214,224) all has screw thread (25), and described screw thread (25) has regular length.
6. the measurement mechanism of foundation pit enclosure structure layering horizontal shift according to claim 1, is characterized in that: (212,222) are all connected with external triggering line and external trigger button to first, second laser range sensor described.
7. the measurement mechanism of foundation pit enclosure structure layering horizontal shift according to claim 1, is characterized in that: described reference point (31) is more than or equal to 5 times of described foundation ditch (1) cutting depth to the distance of described second laser range sensor (222).
8. adopt the measurement mechanism described in claim 1 to carry out a method for foundation pit enclosure structure layering horizontal shift measurement, it is characterized in that comprising the following steps:
Selected reference point (31), using described second laser range sensor (222) installation place as benchmark measuring point (32), the distance value l of described reference point (31) to described benchmark measuring point (32) is measured according to survey frequency with the second laser range sensor (222), according to survey frequency, each measured value l jwith first measured value l 0difference be the abswolute level shift value Δ l of described benchmark measuring point (32) j, Δ l j=| l j-l 0|, wherein j represents pendulous frequency, j=0,1,2
Using the installation place of described first laser range sensor (212) as working base point (33), along with the excavation of described foundation ditch (1) each layer, the corresponding each layer of described second building enclosure (42) installs described displacement reflecting piece (213) successively, using described displacement reflecting piece (213) installation place as displacement measuring points (34), measure the distance value l of described working base point (33) to each described displacement measuring points (34) with described first laser range sensor (212) according to described survey frequency and the excavation number of plies ij, wherein i represents the excavation number of plies; Each measured value l ijwith first measured value l i0difference DELTA l ij=| l ij-l i0| the described displacement measuring points (34) being projected as i-th layer is on a horizontal to the relative horizontal displacement value δ of described working base point (33) ij, δ ij=Δ l ijsin θ i, wherein h ifor excavation is to the degree of depth of foundation ditch when i-th layer; During ground floor (11) of excavation pit (1), displacement measuring points (341) is arranged on inside the collar tie beam of the second building enclosure (42), relative with first setscrew (214) of the first building enclosure (41) collar tie beam side, adjust the bulb rotor (232) be connected on the first laser range sensor (212), make laser emission point sight displacement reflecting piece (213), record the distance value of displacement measuring points (341) to working base point (33); Collar tie beam is the rigid body do not deformed, and therefore each measured value is a definite value l 1;
The displacement measuring points (34) of described i-th layer is to the relative horizontal displacement value δ of described working base point (33) ijwith the abswolute level shift value Δ l of described benchmark measuring point (32) jdifference be the abswolute level displacement S of the displacement measuring points (34) of described i-th layer ij, S ij=| δ ij-Δ l j|.
9. the method measured of foundation pit enclosure structure layering horizontal shift according to claim 8, is characterized in that, also comprises the described displacement measuring points (34) of the described i-th layer relative horizontal displacement value δ to described working base point (33) ijmodification method:
Make δ ij'=δ ij+ δ i-1, k, wherein, δ ij' be modified value; I=2,3, K is the distance value l of described displacement measuring points (34) to described working base point (33) of first described i-th layer of measurement i0time, to the pendulous frequency of the i-th-1 layer; δ i-1, kfor at the distance value l of the first described displacement measuring points (34) measuring i-th layer to described working base point (33) i0time, the described displacement measuring points (34) of the i-th-1 layer is relative to the relative horizontal displacement value of described working base point (33).
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