CN104110021A - Z-type or U-type cross section steel sheet pile lateral soil pressure monitoring method - Google Patents
Z-type or U-type cross section steel sheet pile lateral soil pressure monitoring method Download PDFInfo
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- CN104110021A CN104110021A CN201410325244.7A CN201410325244A CN104110021A CN 104110021 A CN104110021 A CN 104110021A CN 201410325244 A CN201410325244 A CN 201410325244A CN 104110021 A CN104110021 A CN 104110021A
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Abstract
The invention relates to a Z-type or U-type cross section steel sheet pile lateral soil pressure monitoring method. The method includes the steps that (1) a conventional vibration-wire type total soil pressure gage is improved; (2) small holes approximate to stress sensors in size are cut at the positions needing to be monitored in the steel sheet pile depth direction; (3) the soil pressure gage is installed inside a steel sheet pile, and the surface of the soil pressure gage and the surface of the steel sheet pile are coincident; (4) the soil pressure gage is fixed on the steel sheet pile through a protection steel sheet; (5) protection wires and triangular box iron of the sensors are installed, and waterproof processing is carried out; (6) ends of all the wires are fixed in a protection box. By means of the Z-type or U-type cross section steel sheet pile lateral soil pressure monitoring method, the arch effect caused by the Z-type or U-type cross section of the steel sheet pile can be effectively monitored, inaccurate soil pressure monitoring caused by rigidity difference between a monitoring instrument and the steel sheet pile, looseness of the instrument, damage to the wires and the like are avoided, and the Z-type or U-type cross section steel sheet pile lateral soil pressure monitoring method is of great significance in mastering the development the lateral soil pressure of the steel sheet pile and controlling the deformation development of the corresponding steel sheet pile.
Description
Technical field
The present invention relates to a kind of lateral earth pressure monitoring method, especially relate to a kind of Z-type or U-shaped cross section metal sheet pile side direction soil monitoring method.
Background technology
Traditional steel sheet pile enclosure structure side mainly contains to Monitoring on Earth Pressure method: (1) is attached to steel sheet pile surface earth pressure gauge and then squeezes in soil layer; (2) after squeezing in soil layer, steel sheet pile along depth direction boring, then buries earth pressure gauge in the position near steel sheet pile underground.Although the first monitoring method is simple to operation, at steel sheet pile, squeeze into earth pressure gauge in soil layer process and extremely easily destroyed, and unavoidably cause pique effect because earth pressure gauge is attached to steel sheet pile surface, so measured result is inaccurate.Although the second monitoring method can avoid earth pressure gauge to be destroyed in piling process, its soil pressure monitoring not really acts on the soil pressure on steel sheet pile, and its result is not true and reliable.Secondly, domestic soil pressure sensor used belongs to steel chord type or resistance-type more at present, and precision is poor, and its soil pressure that measures is an isolated point but not a face, so can not reflect truly the soil pressure development acting in space enclosing structure.Finally, these traditional monitoring methods can not be considered " arching " that cause due to steel sheet pile Z-type or U-shaped cross section impact on soil pressure development.These factors cause design, construction or researcher to be difficult to grasp the true development of metal sheet pile side direction soil above, thereby cause predicting the difficulty of steel sheet-pile deformation development, cause unnecessary waste or bring unnecessary loss.
Summary of the invention
Object of the present invention be exactly in order to overcome the defect that above-mentioned prior art exists, provide a kind of monitoring result more accurately, Z-type or the U-shaped cross section metal sheet pile side direction soil monitoring method of longer service life.
Object of the present invention can be achieved through the following technical solutions:
Z-type or U-shaped cross section metal sheet pile side direction soil monitoring method, adopt following steps:
1) transform the total earth pressure gauge of conventional type vibration wire;
2) the big or small aperture approximate with strain gauge size of position cut lengths in needs monitoring along steel sheet pile depth direction;
3) earth pressure gauge be arranged on to steel sheet pile inside and keep its surface consistent with steel sheet pile surface;
4) by protection steel disc, earth pressure gauge is fixed on above steel sheet pile;
5) the triangle channel-section steel of guardwire and sensor be installed and carried out waterproofing work;
6) all conducting wire ends are fixed in protection box, can monitor Z-type or U-shaped cross section metal sheet pile side direction soil.
Step 1) the total earth pressure gauge of conventional type vibration wire is transformed; the thickness of the stressometer sheet on controlled pressure meter is consistent with steel sheet pile to be monitored with rigidity; and at a protection steel disc of the back side of stressometer sheet welding; its role is to after stressometer sheet is put the otch above steel sheet pile into; its protection steel disc behind can be welded on the steel sheet pile back side, thereby counter stress meter sheet plays fixing and protective effect.
Step 2) be that steel sheet pile is being squeezed into before soil layer, at previously selected monitoring location cutting aperture, its shape is consistent with the stressometer sheet of use, its size is slightly larger than the stressometer sheet that will use, and to avoid that steel sheet pile is pressed into stressometer sheet in soil layer process, bears axial compression effect and is destroyed.
Step 3) in, the stressometer sheet of earth pressure gauge and the space between steel sheet pile are filled closely knit by flexible material.
Step 5) be along depth direction, to settle a triangle channel-section steel at the back side of stressometer sheet, and reading wire and the sensor of the stressometer sheet of arranging along same depth direction are placed in triangle channel-section steel, thereby avoid sensor and wire in work progress to be broken ring.
Triangle steel disc welded seal for the bottom of described triangle channel-section steel, top seals with the filler that foam-like has water-proof function.
Compared with prior art, the present invention has the following advantages:
1) soil pressure that the earth pressure gauge of transformation is surveyed is a face, but not an independent point, the soil pressure therefore measuring is more accurate, more scientific;
Therefore 2) because stressometer sheet is arranged in steel sheet pile, and its rigidity is consistent with thickness and steel sheet pile, has effectively avoided protruding or recessed or work progress Instrumental is out of shape inconsistent brought pique effect with space enclosing structure due to instrument;
3) can effectively monitor " arching " that cause due to Z-type or U-shaped cross section impact on lateral earth pressure;
4) the protection steel disc at the stressometer sheet back side can closely be fixed on earth pressure gauge above steel sheet pile, prevents the loosening of stressometer sheet or comes off;
5) triangle channel-section steel plays a very good protection to sensor and wire, can effectively avoid wire and sensor in construction or observation process to suffer accidental destruction;
6) the protection box that is arranged at ground plays fine protective effect to the exposed line of tension of leading of instrument, can effectively avoid the damage to conducting wire end due to weather or fortuitous event.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of the total earth pressure gauge of improved type vibration wire;
Fig. 2 is the total earth pressure gauge plan structure of improved type vibration wire schematic diagram;
Structural representation when Fig. 3 is the total earth pressure gauge use of improved type vibration wire;
The schematic diagram of Fig. 4 when soil pressure is monitored;
Fig. 5 is the partial enlarged drawing of details 1 in Fig. 4;
Fig. 6 is the partial enlarged drawing of details 2 in Fig. 4.
In figure, 1 is that stressometer sheet, 2 is that sensor, 3 is that wire, 4 is that steel sheet pile, 5 is triangle channel-section steel for protecting steel disc, 6.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
Z-type or U-shaped cross section metal sheet pile side direction soil monitoring method, as shown in Figs. 4-6, adopt following steps during monitoring:
1) transform the total earth pressure gauge of conventional type vibration wire, as shown in Figures 1 to 3, pressure gauge is mainly comprised of stressometer sheet 1, sensor 2 and wire 3, the thickness of the stressometer sheet 1 during transformation on controlled pressure meter is consistent with steel sheet pile to be monitored with rigidity, and at a protection steel disc of the back side of stressometer sheet welding, its role is to after stressometer sheet is put the otch above steel sheet pile into, its protection steel disc behind can be welded on the steel sheet pile back side, thereby counter stress meter sheet plays fixing and protective effect;
2) steel sheet pile 4 is being squeezed into before soil layer, at previously selected monitoring location cutting aperture, its shape is consistent with the stressometer sheet of use, and its size is slightly larger than the stressometer sheet that will use, and to avoid that steel sheet pile is pressed into stressometer sheet in soil layer process, bears axial compression effect and is destroyed;
3) earth pressure gauge be arranged on to steel sheet pile 4 inside and keep its surface consistent with the surface of steel sheet pile 4, the stressometer sheet 1 of earth pressure gauge and the space between steel sheet pile 4 are filled closely knit by flexible material;
4) by protection steel disc 5, earth pressure gauge is fixed on above steel sheet pile 4;
5) the triangle channel-section steel 6 of guardwire and sensor be installed and carried out waterproofing work, a triangle channel-section steel 6 is settled along depth direction in the back side of stressometer sheet 1, and reading wire and the sensor of the stressometer sheet of arranging along same depth direction are placed in triangle channel-section steel 6, thereby avoid sensor and wire in work progress to be broken ring, triangle steel disc welded seal for the bottom of triangle channel-section steel 6, top seals with the filler that foam-like has water-proof function;
6) all conducting wire ends are fixed in protection box, can monitor Z-type or U-shaped cross section metal sheet pile side direction soil.
As a kind of common flexible shoring structure, steel sheet pile can bear moderate finite deformation, and does not need dewatering measure in work progress, thereby is applicable to the place that groundwater table is higher or bearing capacity is poor.In view of these advantages, steel sheet pile (Sheet Pile Walls) is widely used in excavation of foundation pit, coastal engineering, port works and traffic engineering.Steel sheet pile design theory is often based on soil pressure or moment of flexure balance, and therefore a certain amount of on-the-spot Monitoring on Earth Pressure data contribute to design, construction and scientific research personnel to improve relevant steel sheet pile design and construction level.Due to traditional monitoring method cause monitoring instrument steel sheet pile bury and work progress in very easily destroyed and traditional soil pressure sensor precision not high, up to the present, only having very limited indoor or field monitoring data is the soil pressure distribution situations that act in relevant Excavation Process on support or anchor pole composite steel plate pile, and these monitorings indirectly measurement act on the soil pressure on steel sheet pile, but monitoring is supported or the internal force of anchor pole.Due to the shortage of field measurement data, thereby cause steel sheet pile design and construction development of deformation difficult and that be difficult to steel sheet pile in work progress to make reliable prediction.
Along with constantly bringing forth new ideas of scientific and technical progress and relevant monitoring instrument, therefore likely the lateral earth pressure acting on steel sheet pile is carried out to monitor.For method one, be different from traditional soil pressure sensor, it is a soil pressure situation on relatively large area but not an isolated point that new type vibration wire soil pressure sensor is monitored, the data that therefore measure more approach true soil pressure development.By the transformation to soil pressure sensor, sensor and steel sheet pile structure are combined together in observation process, thereby avoided because concavo-convex or instrument and the inconsistent Monitoring on Earth Pressure causing of steel sheet pile malformation of instrument itself are inaccurate.And be arranged in soil pressure sensor steel disc behind, can effectively soil pressure instrument be fixed on to steel sheet pile, avoid its slip or come off.The existence of triangle channel-section steel is well protected sensor and reading wire, stake bury and construction activities in be not subject to damage.Meanwhile, the triangle channel-section steel of sealing can not be immersed in water wire and sensor for a long time, thereby has extended the application life of monitoring instrument.
Claims (6)
1.Z type or U-shaped cross section metal sheet pile side direction soil monitoring method, is characterized in that, the method adopts following steps:
1) transform the total earth pressure gauge of conventional type vibration wire;
2) the big or small aperture approximate with strain gauge size of position cut lengths in needs monitoring along steel sheet pile depth direction;
3) earth pressure gauge be arranged on to steel sheet pile inside and keep its surface consistent with steel sheet pile surface;
4) by protection steel disc, earth pressure gauge is fixed on above steel sheet pile;
5) the triangle channel-section steel of guardwire and sensor be installed and carried out waterproofing work;
6) all conducting wire ends are fixed in protection box, can monitor Z-type or U-shaped cross section metal sheet pile side direction soil.
2. Z-type according to claim 1 or U-shaped cross section metal sheet pile side direction soil monitoring method; it is characterized in that; step 1) the total earth pressure gauge of conventional type vibration wire is transformed; the thickness of the stressometer sheet on controlled pressure meter is consistent with steel sheet pile to be monitored with rigidity, and at a protection steel disc of the back side of stressometer sheet welding.
3. Z-type according to claim 1 or U-shaped cross section metal sheet pile side direction soil monitoring method, it is characterized in that, step 2) be that steel sheet pile is being squeezed into before soil layer, at previously selected monitoring location cutting aperture, its shape is consistent with the stressometer sheet of use, and its size is slightly larger than the stressometer sheet that will use.
4. Z-type according to claim 1 or U-shaped cross section metal sheet pile side direction soil monitoring method, is characterized in that step 3) in the stressometer sheet of earth pressure gauge and the space between steel sheet pile by flexible material, fill closely knit.
5. Z-type according to claim 1 or U-shaped cross section metal sheet pile side direction soil monitoring method, it is characterized in that, step 5) be along depth direction, to settle a triangle channel-section steel at the back side of stressometer sheet, and reading wire and the sensor of the stressometer sheet of arranging along same depth direction are placed in triangle channel-section steel.
6. Z-type or U-shaped cross section metal sheet pile side direction soil monitoring method according to claim 1 or 5, is characterized in that, triangle steel disc welded seal for the bottom of described triangle channel-section steel, and top seals with the filler that foam-like has water-proof function.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106284201A (en) * | 2016-09-06 | 2017-01-04 | 河海大学 | A kind of side, covered sheet pile harbour front wall land horizontal earth pressure load computational methods |
| CN106917421A (en) * | 2017-03-06 | 2017-07-04 | 河海大学 | The method of soil pressure meter installation system and metal sheet pile side direction soil condition discrimination |
| CN108035330A (en) * | 2017-11-24 | 2018-05-15 | 河海大学 | A kind of device and method of while embedded multiple soil pressure sensors |
| CN108181027A (en) * | 2018-01-05 | 2018-06-19 | 北京科技大学 | A kind of type vibration wire borehole stressmeter mounting head |
| CN108468320A (en) * | 2018-05-28 | 2018-08-31 | 南京信息工程大学 | A kind of device and method measuring natural gas line surrounding soil pressure using vibratory stress gauge |
| CN110186491A (en) * | 2019-06-18 | 2019-08-30 | 重庆交通大学 | Sensor survey line protective device and sensor survey line protect component |
| CN111021329B (en) * | 2019-12-31 | 2021-05-11 | 深圳宏业基岩土科技股份有限公司 | Deep soil pressure box installation method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109083119A (en) * | 2018-09-26 | 2018-12-25 | 上海地矿工程勘察有限公司 | Soil pressure cell inbuilt device and method for embedding suitable for soft clay area |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106284201A (en) * | 2016-09-06 | 2017-01-04 | 河海大学 | A kind of side, covered sheet pile harbour front wall land horizontal earth pressure load computational methods |
| CN106284201B (en) * | 2016-09-06 | 2019-03-01 | 河海大学 | A kind of covered sheet pile harbour front wall land side horizontal earth pressure load calculation method |
| CN106917421A (en) * | 2017-03-06 | 2017-07-04 | 河海大学 | The method of soil pressure meter installation system and metal sheet pile side direction soil condition discrimination |
| CN108035330A (en) * | 2017-11-24 | 2018-05-15 | 河海大学 | A kind of device and method of while embedded multiple soil pressure sensors |
| CN108035330B (en) * | 2017-11-24 | 2019-11-22 | 河海大学 | Device and method that is a kind of while burying multiple soil pressure sensors |
| CN108181027A (en) * | 2018-01-05 | 2018-06-19 | 北京科技大学 | A kind of type vibration wire borehole stressmeter mounting head |
| CN108181027B (en) * | 2018-01-05 | 2023-10-13 | 北京科技大学 | Vibrating wire type drilling stress meter mounting head |
| CN108468320A (en) * | 2018-05-28 | 2018-08-31 | 南京信息工程大学 | A kind of device and method measuring natural gas line surrounding soil pressure using vibratory stress gauge |
| CN110186491A (en) * | 2019-06-18 | 2019-08-30 | 重庆交通大学 | Sensor survey line protective device and sensor survey line protect component |
| CN111021329B (en) * | 2019-12-31 | 2021-05-11 | 深圳宏业基岩土科技股份有限公司 | Deep soil pressure box installation method |
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| CN104110021B (en) | 2016-04-20 |
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