CN115613540A - Soil layered settlement testing device and burying method - Google Patents
Soil layered settlement testing device and burying method Download PDFInfo
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- CN115613540A CN115613540A CN202211411311.8A CN202211411311A CN115613540A CN 115613540 A CN115613540 A CN 115613540A CN 202211411311 A CN202211411311 A CN 202211411311A CN 115613540 A CN115613540 A CN 115613540A
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- 239000002689 soil Substances 0.000 title claims abstract description 69
- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012544 monitoring process Methods 0.000 claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 8
- 238000004062 sedimentation Methods 0.000 claims description 56
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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Abstract
The invention relates to the technical field of layered settlement monitoring of deep soil bodies of geotechnical engineering, in particular to a magnetic ring type layered settlement testing device suitable for drilling embedding and an embedding method thereof; the layered settlement testing device comprises a layered settlement magnetic ring (1), a spring leg (2), a positioning nail (3), a settlement sleeve (6), a binding rope (7), a binding release component (8) and a pull rope (9); the layered settlement magnetic ring (1) device with the positioning needle (3) on the spring leg (2) is matched with a settlement sleeve (6) capable of opening a positioning hole for use, so that the installation position and the burying depth of the layered settlement magnetic ring (1) can be accurately controlled, and the problem of limited range caused by the fact that the layered settlement magnetic ring (1) is fixed by the positioning ring in the prior art is completely solved.
Description
Technical Field
The invention relates to the technical field of layered settlement monitoring of deep soil bodies in geotechnical engineering, in particular to a magnetic ring type layered settlement testing device suitable for drilling embedding and an embedding method thereof.
Background
At present, in geotechnical engineering monitoring, the vertical displacement conditions of soil bodies at different depths of a foundation and the surrounding environment are one of important indexes for monitoring engineering safety, engineering quality and the influence of the surrounding environment, and a soil body layered settlement monitoring device and a soil body layered settlement monitoring method are important for guaranteeing to obtain reliable soil body vertical displacement data.
The existing soil body layered settlement monitoring method mainly comprises a layered settlement magnetic ring method, a multipoint displacement meter method, a method for burying layered settlement marks and the like, wherein the layered settlement magnetic ring method is widely adopted due to the advantages of relatively simple structure, capability of burying a plurality of holes and measuring a plurality of holes and the like. The method for measuring the vertical displacement of the soil bodies with different depths by the layered settlement magnetic ring method mainly comprises the steps of drilling holes at set positions, packing spring pieces on a plurality of settlement magnetic rings by using a binding rope or a chain according to design positions and binding the spring pieces on a PVC pipe, limiting the magnetic rings by using an upper positioning ring and a lower positioning ring, splicing and placing the PVC pipe with the settlement magnetic rings into the holes section by section, covering a PVC pipe cover, and backfilling fillers between the PVC pipe cover and the wall of the drilled hole to enable the drilled hole to be compact. After the embedding is completed, the sedimentation magnetic ring can move along with the displacement of the soil body at the corresponding position, the layered settlement meter is used for periodically collecting, and the vertical displacement of the soil body at the corresponding position can be obtained through calculation.
However, when the layered settlement magnetic ring device and the embedding method are adopted to monitor the vertical displacement of soil bodies at different depths, the following problems exist:
(1) The monitoring range is limited. In the embedding process, the magnetic ring can move up and down along the pipe wall in the range of the positioning ring, the specific position of the magnetic ring between the positioning rings is difficult to control after the embedding is finished, the upper and lower measuring ranges of the magnetic ring are difficult to achieve an ideal state, and the deformation phenomenon beyond the range cannot be monitored by the magnetic ring under the limitation of the positioning ring in the actual monitoring process;
(2) The mass of the magnetic ring legs bouncing into the surrounding soil body is difficult to control. Conventionally, a mode of binding magnetic rings by chains is adopted, a spring leg needs to be released in a mode of dragging a steel wire penetrating between chains, and the step is complex in operation and difficult to control. If the binding rope is used for binding the magnetic ring spring pieces, experiments show that the binding rope automatically bubbles in muddy water for more than hours and even days, and the embedding progress and the embedding quality are seriously influenced.
(3) The PVC pipe has poor stability after being buried. The conventional magnetic ring is small in size, the fact that the spring leg extends into undisturbed soil to a sufficient depth is generally guaranteed in the embedding process through the mode of lifting the PVC pipe, on one hand, when the plurality of magnetic rings exist, the method is difficult to control, the bottom of the PVC pipe does not fall on the bottom of a hole at last, and the follow-up PVC pipe can sink for a long time, so that the monitoring precision of the magnetic ring is influenced.
Disclosure of Invention
The invention provides a layered settlement magnetic ring device capable of being fixed on a PVC pipe by itself, aiming at the problems of limited monitoring range, difficult control of burying quality and the like in the current layered settlement magnetic ring burying and testing process.
The technical scheme of the invention is as follows:
a soil body layered settlement testing device comprises a layered settlement magnetic ring, a spring leg, a positioning nail, a settlement sleeve, a binding rope, a binding release component and a pull rope; the layered settlement magnetic ring is sleeved on the pipe body of the settlement sleeve, the inner ring wall of the layered settlement magnetic ring is smooth, the inner diameter of the layered settlement magnetic ring is slightly larger than that of the settlement sleeve, and the layered settlement magnetic ring can freely move on the settlement sleeve; the number of the spring legs is multiple, one end of each spring leg is fixed with the layered settlement magnetic ring, and the other end of each spring leg extends outwards to form a free end; the positioning nail is a nail-shaped cylinder and is arranged at the tail end of the free end of the spring leg; the binding rope is a binding object which can fix the spring leg on the sedimentation casing pipe; the bundle releasing component is a structure with one end provided with a circular pull ring and the other end provided with a U-shaped blade, the bundle rope penetrates through the U-shaped part of the U-shaped blade, and the circular pull ring is connected with one end of the pull rope.
Preferably, the circular pull ring is a metal ring with a certain thickness, and a rope with higher strength can be bound on the circular pull ring without generating a cutting effect.
Further, according to the soil body layered settlement testing device, the layered settlement magnetic ring is internally provided with the annular artificial magnet with stable magnetism, and the layered settlement magnetic ring is externally wrapped with the high-strength corrosion-resistant plastic protective shell; one end of each spring leg is fixed on the plastic protective shell, and an included angle of 30-60 degrees is formed between each spring leg and the plane of the layered settlement magnetic ring after the spring legs are bounced open; preferably at a 45 degree angle, and can be customized as desired.
Furthermore, in the soil body layered settlement testing device, 4, 6 or 8 spring legs can be symmetrically led out from the upper end and the lower end of the layered settlement magnetic ring respectively.
Furthermore, above-mentioned soil body layering subsides testing arrangement, the location nail with spring leg junction becomes 90 degrees.
Furthermore, in the above soil body layered settlement testing device, the spring leg is made of a high-toughness steel sheet with a certain thickness. Made of a high-toughness steel sheet, can provide a relatively high elastic force after being bent.
Furthermore, according to the soil body layered settlement testing device, the end part of the free end of the spring leg is bent at a certain angle. So that the elastic ball has larger holding power and stability after being bounced into undisturbed soil. Preferably, the angle is 120 degrees, 135 degrees or 150 degrees from the spring leg.
Furthermore, according to the soil body layered settlement testing device, the settlement sleeve is a hollow pipe which can be spliced and has a certain thickness and strength, the diameter of the settlement sleeve is smaller than the inner diameter of the layered settlement magnetic ring and is not less than 1cm, and the outer wall of the settlement sleeve is smooth; and positioning holes with the same quantity as the spring legs are formed in the positions of the layered settlement magnetic rings to be installed, and the diameters of the positioning holes are slightly larger than those of positioning nails on the spring legs.
Furthermore, according to the soil body layered settlement testing device, the U-shaped blades are U-shaped metal rings which are thin in the inner part and thick in the outer part, and the thin inner edges can effectively cut and split the ropes under certain tension.
Furthermore, in the soil layered settlement testing device, the binding rope is a binding object for fixing the magnetic ring spring leg on the settlement sleeve and is a fragile binding rope with moderate strength; the pull rope is made of a tough material with high strength.
Further, the burying method of the soil body layered settlement testing device comprises the following steps:
s1, preparing a corresponding number of sedimentation sleeves and layered sedimentation magnetic rings according to the vertical displacement monitoring requirement of a soil body, and sequentially placing the sedimentation sleeves near a position to be buried;
s2, measuring the layered settlement magnetic rings in sequence according to the designed buried depth of each layered settlement magnetic ring, installing the layered settlement magnetic rings at the specific positions of the corresponding settlement sleeves, sleeving the layered settlement magnetic rings on the corresponding settlement sleeves after marking, and moving the layered settlement magnetic rings to the corresponding positions;
s3, retracting the spring legs of the layered sedimentation magnetic ring, marking the position of the positioning nail on the sedimentation sleeve, then loosening the positioning nail, and forming a positioning hole in the corresponding position on the sedimentation sleeve, wherein the diameter of the positioning nail is slightly larger than that of the positioning nail;
s4, after the positioning holes in the sedimentation sleeve are formed, the spring legs of the layered sedimentation magnetic ring are folded, all the positioning nails are ensured to be inserted into the circular holes of the sedimentation sleeve, and the spring legs are firmly bound on the sedimentation sleeve by using the binding ropes;
s5, sequentially finishing the binding and fixing work of all the layered settlement magnetic rings, and fixing a magnetic ring without a spring leg at the bottom of the settlement sleeve by using a positioning ring to serve as a basic magnetic ring for layered settlement monitoring;
s6, forming a hole at the position where the layered settlement monitoring of the soil body is to be carried out by using a drilling machine, wherein the depth of the formed hole is properly slightly smaller than the designed buried depth of the settlement sleeve according to the property of the lowest soil layer, and the diameter of the drilled hole is comprehensively determined according to the diameter of a layered settlement magnetic ring, a hole filling mode and a hole filling material;
s7, after the drill hole is drilled in place, the sedimentation sleeve with the magnetic rings fixed well is placed into the hole section by section, the sedimentation sleeve sections need to be connected firmly, looseness and even falling off in the embedding process and the subsequent monitoring process are prevented, and pull ropes on each layered sedimentation magnetic ring are arranged according to the embedding sequence in the placement process, so that pulling or mutual winding is avoided;
s8, after the sedimentation sleeve is placed at the bottom of the drill hole, the sedimentation sleeve is pressed at the hole opening through manpower or equipment, and the bottom end of the sedimentation sleeve enters undisturbed soil to the designed depth;
s9, pulling pull ropes bound on the round pull rings of the unbundling components of each layered settlement magnetic ring from bottom to top in sequence on the ground, enabling the spring legs on each layered settlement magnetic ring to bounce off in sequence, enabling the free ends of the spring legs to be capable of penetrating into an original soil body on the side wall of a drilled hole due to high elasticity of the spring legs, and particularly paying attention to pulling the pull ropes of the layered settlement magnetic rings on the upper portion after the pull ropes of the layered settlement magnetic rings on the lower portion are completely pulled out of the ground to prevent the pull ropes from being wound with each other;
s10, after spring legs of all layered settlement magnetic rings are bounced off, hole sealing is carried out in the modes of slurry injection, sand filling, clay ball filling and the like according to the characteristics of a soil layer, the hole sealing quality must be strictly controlled, and the phenomenon that the difference between the physical and mechanical properties of fillers and the surrounding soil layer is too large is avoided;
s11, after backfilling is finished, arranging a protective cover at an orifice to prevent a hole from being damaged or impurities from entering a sedimentation sleeve;
s12, during measurement, the protective cover is opened, and the layered settlement magnetic rings at all positions are subjected to round-trip test for not less than 3 times by using a layered settlement magnetic ring instrument.
Preferably, the soil layer is a to-be-detected layered settlement soil layer;
preferably, the drilling is a hole formed by a drilling machine at a set position of the soil layer to be detected, the diameter of the formed hole is more than 8cm larger than the outer diameter of the layered settlement magnetic ring, and the depth of the formed hole is determined according to the layered settlement depth of the soil layer to be detected.
Preferably, the pull rope on the pull ring of the unbundling component is a high-strength tough material, one end of the pull rope is provided with two branches, one branch is tied to the descending sedimentation sleeve, the other end of the pull rope is led to the ground along a drill hole, and the unbundling component is driven by the pulling force of ground operators to split the unbundling rope.
Compared with the prior art, the invention has the following beneficial effects:
(1) The layered settlement magnetic ring device with the positioning pins on the spring legs is matched with a settlement sleeve pipe capable of opening positioning holes for use, the installation position and the burying depth of the layered settlement magnetic ring can be accurately controlled, and the problem of limited measuring range caused by the fact that the layered settlement magnetic ring is fixed by the positioning rings in the prior art is completely solved.
(2) In the embedding method, the binding ropes, the unbinding part with the pull ring and the pull ropes extending out of the ground are matched for use, so that the spring legs of each settlement magnetic ring before hole filling can be effectively ensured to be completely bounced open and fully anchored in original soil outside the wall of a drill hole, and the measurement problem that the vertical displacement of the original soil cannot be truly reflected due to the fact that the spring legs cannot be bounced open or bounced open sufficiently is solved.
Drawings
FIG. 1 is a schematic side sectional view of a layered settlement magnet ring;
FIG. 2 is a schematic cross-sectional view of a layered settlement magnet ring lowered into a borehole to a certain depth;
FIG. 3 is a schematic cross-sectional view of a layered settlement magnet ring at a certain depth after being buried;
wherein: the device comprises a layered settlement magnetic ring 1, a spring leg 2, a positioning nail 3, a soil layer 4, a drill hole 5, a settlement sleeve 6, a binding rope 7, a binding loosening component 8 and a pull rope 9.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
The soil body layered settlement testing device shown in fig. 1 comprises a layered settlement magnetic ring 1, a spring leg 2, a positioning nail 3, a settlement sleeve 6, a binding rope 7, a binding releasing component 8 and a pull rope 9; the layered settlement magnetic ring 1 is sleeved on the body of the settlement sleeve 6, the inner annular wall of the layered settlement magnetic ring 1 is smooth, the inner diameter is slightly larger than that of the settlement sleeve 6, and the layered settlement magnetic ring 1 can freely move on the settlement sleeve 6; the number of the spring legs 2 is multiple, one end of each spring leg 2 is fixed with the layered settlement magnetic ring 1, and the other end of each spring leg extends outwards to form a free end; the positioning nail 3 is a nail-shaped cylinder and is arranged at the tail end of the free end of the spring leg 2; the binding rope 7 is a binding object which can fix the spring leg 2 on the sedimentation sleeve 6; the bundle loosening part 8 is a structure with one end provided with a circular pull ring and the other end provided with a U-shaped blade, the bundle rope 7 penetrates through the U-shaped part of the U-shaped blade, and the circular pull ring is connected with one end of the pull rope 9.
Example 2
The soil body layered settlement testing device shown in the figures 1-3 comprises a layered settlement magnetic ring 1, a spring leg 2, a positioning nail 3, a settlement sleeve 6, a binding rope 7, a binding release component 8 and a pull rope 9; the layered settlement magnetic ring 1 is sleeved on the body of the settlement sleeve 6, the inner annular wall of the layered settlement magnetic ring 1 is smooth, the inner diameter of the layered settlement magnetic ring is slightly larger than that of the settlement sleeve 6, and the layered settlement magnetic ring 1 can freely move on the settlement sleeve 6; a plurality of spring legs 2 are arranged, one end of each spring leg 2 is fixed with the layered settlement magnetic ring 1, and the other end of each spring leg extends outwards to form a free end; the positioning nail 3 is a nail-shaped cylinder and is arranged at the tail end of the free end of the spring leg 2; the binding rope 7 is a binding object which can fix the spring leg 2 on the sedimentation sleeve 6; the bundle loosening part 8 is a structure with one end provided with a circular pull ring and the other end provided with a U-shaped blade, the bundle rope 7 penetrates through the U-shaped part of the U-shaped blade, and the circular pull ring is connected with one end of the pull rope 9; further, the layered settlement magnetic ring 1 is internally provided with an annular artificial magnet with stable magnetism, and the outside of the layered settlement magnetic ring is wrapped with a high-strength and corrosion-resistant plastic protective shell; one end of the spring leg 2 is fixed on the plastic protective shell, and forms a 45-degree included angle with the plane of the layered settlement magnetic ring 1 after being bounced open; preferably, the number of the spring legs 2 is 4, and the spring legs are symmetrically led out from four ends of the layered settlement magnetic ring 1 respectively; further, the joint of the positioning pin 3 and the spring leg 2 is at 90 degrees; in particular, the spring legs 2 are made of a high-toughness steel sheet with a certain thickness; furthermore, the end part of the free end of the spring leg 2 is bent by an angle of 30 degrees; preferably, the sedimentation sleeve 6 is a hollow pipe which can be spliced and has certain thickness and strength, the diameter of the sedimentation sleeve 6 is smaller than the inner diameter of the layered sedimentation magnetic ring 1 and is not less than 1cm, and the outer wall of the sedimentation sleeve 6 is smooth; positioning holes with the same quantity as the spring legs 2 are formed in the positions of the layered settlement magnetic rings 1 to be installed, and the diameters of the positioning holes are slightly larger than the diameters of the positioning nails 3 on the spring legs 2; furthermore, the U-shaped blade is a U-shaped metal ring with a thin inner edge and a thick outer edge, and the thin inner edge can effectively cut the binding rope 7 under certain tension; furthermore, the binding rope 7 is a binding object for fixing the magnetic ring spring legs 3 on the sedimentation sleeve 6 and is a fragile binding rope with moderate strength; the pull rope 9 is made of a tough material with high strength.
The burying method of the soil body layered settlement testing device comprises the following steps of:
s1, preparing a corresponding number of sedimentation sleeves 6 and layered sedimentation magnetic rings 1 according to the vertical displacement monitoring requirement of a soil body, and sequentially placing the sedimentation sleeves 6 near a position to be buried;
s2, measuring the layered settlement magnetic rings 1 in sequence according to the designed buried depth of each layered settlement magnetic ring 1, installing the layered settlement magnetic rings at the specific positions of the corresponding settlement sleeves 6, sleeving the layered settlement magnetic rings 1 on the corresponding settlement sleeves 6 after marking, and moving the layered settlement magnetic rings to the corresponding positions;
s3, retracting the spring legs 2 of the layered settlement magnetic ring 1, marking the positions of the positioning pins 3 on the settlement sleeve 6, loosening the positioning pins 3, and forming positioning holes in the corresponding positions on the settlement sleeve 6, wherein the diameter of each positioning pin is slightly larger than that of the positioning pin 3;
s4, after the positioning holes in the sedimentation sleeve 6 are formed, the spring legs 2 of the layered sedimentation magnetic ring 1 are folded to ensure that all the positioning nails 3 are inserted into the circular holes of the sedimentation sleeve 6, and then the spring legs 2 are firmly bound on the sedimentation sleeve 6 by using the binding ropes 7;
s5, sequentially finishing the binding and fixing work of all the layered settlement magnetic rings 1, and fixing a magnetic ring without a spring leg 2 at the bottom of the settlement sleeve 6 by using a positioning ring to serve as a basic magnetic ring for layered settlement monitoring;
s6, forming a hole at the position to be subjected to the soil body layered settlement monitoring by using a drilling machine, wherein the hole forming depth is properly slightly smaller than the designed buried depth of the settlement sleeve 6 according to the property of the lowermost soil layer 4, and the diameter of the drilled hole 5 is comprehensively determined according to the diameter of the layered settlement magnetic ring 1, the hole filling mode and the hole filling material;
s7, after the drill hole is drilled in place, the sedimentation sleeve 6 with the magnetic rings fixed well is placed into the hole section by section, the sections of the sedimentation sleeve 6 need to be firmly connected, the phenomenon that the sections are loosened and even fall off in the embedding process and the subsequent monitoring process is avoided, and the pull ropes 9 on each layered sedimentation magnetic ring 1 are arranged according to the embedding sequence in the placement process, so that the pull ropes are prevented from being pulled or wound by force;
s8, after the sedimentation casing 6 is lowered to the bottom of the drill hole 5, the sedimentation casing 6 is pressed at the hole opening through manpower or equipment, and the bottom end of the sedimentation casing 6 enters undisturbed soil to a designed depth;
s9, pulling the pull ropes 9 bound on the circular pull rings of the unbinding parts 8 of each layered settlement magnetic ring 1 in sequence from bottom to top on the ground, so that the spring legs 2 on each layered settlement magnetic ring 1 are sequentially sprung open, the free ends of the spring legs 2 can penetrate into the original soil on the side wall of the drilled hole 5 due to the high elasticity of the spring legs 2, and particularly, after the pull ropes 9 of the layered settlement magnetic rings 1 at the lower part are completely pulled out of the ground, the pull ropes 9 of the layered settlement magnetic rings 1 at the upper part are pulled, so that the pull ropes 9 are prevented from being wound with each other;
s10, after the spring legs 2 of all the layered settlement magnet rings 1 are bounced off, hole sealing is carried out by adopting the modes of slurry injection, sand filling, clay ball filling and the like according to the characteristics of the soil layer 4, the hole sealing quality must be strictly controlled, and the phenomenon that the difference between the physical and mechanical properties of the filler and the surrounding soil layer 4 is overlarge is avoided;
s11, after backfilling is finished, arranging a protective cover at an orifice to prevent a hole from being damaged or impurities from entering a sedimentation sleeve 6;
s12, during measurement, the protective cover is opened, and the layered settlement magnetic rings 1 at all positions are tested in sequence for not less than 3 times in a reciprocating mode by the layered settlement magnetic ring instrument.
As can be seen from the above-mentioned embodiments,
(1) The layered settlement magnetic ring 1 device with the positioning pin 3 on the spring leg 2 is matched with a settlement sleeve 6 capable of opening a positioning hole for use, so that the installation position and the burying depth of the layered settlement magnetic ring 1 can be accurately controlled, and the problem of limited range caused by the traditional positioning ring for fixing the layered settlement magnetic ring 1 is completely solved.
(2) According to the embedding method, the binding ropes 7, the unbundling part 8 with the pull ring and the pull rope 9 extending out of the ground are matched for use, so that the spring legs 2 of each layered settlement magnetic ring 1 before hole filling can be effectively guaranteed to be completely bounced open and are fully anchored in undisturbed soil outside the wall of the drill hole 5, and the problem that the spring legs 2 cannot be bounced open or cannot be bounced open sufficiently to truly reflect the vertical displacement of the undisturbed soil is solved.
The above are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, but the claims and the summary of the invention are not limited by the simple equivalent changes and modifications.
Claims (10)
1. The soil body layered settlement testing device is characterized by comprising a layered settlement magnetic ring (1), spring legs (2), positioning nails (3), settlement sleeves (6), binding ropes (7), binding release components (8) and pull ropes (9); the layered settlement magnetic ring (1) is sleeved on the pipe body of the settlement sleeve (6), the inner annular wall of the layered settlement magnetic ring (1) is smooth, the inner diameter of the layered settlement magnetic ring is slightly larger than that of the settlement sleeve (6), and the layered settlement magnetic ring (1) can freely move on the settlement sleeve (6); a plurality of spring legs (2) are arranged, one end of each spring leg (2) is fixed with the layered settlement magnetic ring (1), and the other end of each spring leg extends outwards to form a free end; the positioning nail (3) is a nail-shaped cylinder and is arranged at the tail end of the free end of the spring leg (2); the binding rope (7) is a binding object which can fix the spring leg (2) on the sedimentation sleeve (6); the binding releasing component (8) is a structure with one end provided with a circular pull ring and the other end provided with a U-shaped blade, the binding rope (7) penetrates through the U-shaped part of the U-shaped blade, and the circular pull ring is connected with one end of the pull rope (9).
2. The soil layered settlement testing device as claimed in claim 1, wherein the layered settlement magnetic ring (1) has an annular artificial magnet with stable magnetism inside and a high-strength and corrosion-resistant plastic protective shell outside; one end of the spring leg (2) is fixed on the plastic protective shell, and an included angle of 30-60 degrees is formed between the spring leg and the plane of the layered settlement magnetic ring (1) after the spring leg is bounced open.
3. The soil mass layered settlement testing device of claim 1, wherein the number of the spring legs (2) is 4, and the spring legs are symmetrically led out from four ends of the layered settlement magnetic ring (1).
4. Soil layered settlement testing device according to claim 1, characterized in that the positioning pins (3) are at 90 degrees to the spring legs (2) connection.
5. The soil mass layered settlement test device of claim 1, wherein the spring legs (2) are made of a high tenacity steel sheet of a certain thickness.
6. Soil layered settlement testing device according to claim 1, characterized in that the ends of the free ends of the spring legs (2) are bent at an angle.
7. The soil body layered settlement testing device of claim 1, wherein the settlement sleeve (6) is a spliced hollow pipe with certain thickness and strength, the diameter of the settlement sleeve (6) is smaller than the inner diameter of the layered settlement magnetic ring (1) by not less than 1cm, and the outer wall of the settlement sleeve (6) is smooth; positioning holes with the same number as the spring legs (2) are formed in the positions where the layered settlement magnetic rings (1) are to be installed, and the diameters of the positioning holes are slightly larger than the diameters of the positioning nails (3) on the spring legs (2).
8. The soil layered settlement testing device of claim 1, wherein the U-shaped blade is a U-shaped metal ring with a thin inner edge and a thick outer edge, and the thin inner edge can effectively cut the binding rope (7) under a certain tension.
9. The soil layered settlement testing device of claim 1, wherein the binding rope (7) is a binding for fixing the magnetic ring spring leg (3) to the settlement sleeve (6), and is a fragile binding rope with moderate strength; the pull rope (9) is made of a high-strength flexible material.
10. A method of burying a soil mass layered settlement test apparatus as claimed in any one of claims 1 to 9 including the steps of:
s1, preparing a corresponding number of sedimentation sleeves (6) and layered sedimentation magnetic rings (1) according to the vertical displacement monitoring requirement of a soil body, and sequentially placing the sedimentation sleeves (6) near a position to be buried;
s2, measuring the specific positions of the layered settlement magnetic rings (1) which are arranged at the corresponding settlement sleeves (6) in sequence according to the designed buried depth of each layered settlement magnetic ring (1), sleeving the layered settlement magnetic rings (1) on the corresponding settlement sleeves (6) after marking, and moving the layered settlement magnetic rings to the corresponding positions;
s3, retracting the spring leg (2) of the layered settlement magnetic ring (1), marking the position of the positioning nail (3) on the settlement sleeve (6), then loosening the positioning nail (3), and forming a positioning hole in the corresponding position on the settlement sleeve (6), wherein the diameter of the positioning nail is slightly larger than that of the positioning nail (3);
s4, after the positioning holes in the sedimentation sleeve (6) are formed, the spring legs (2) of the layered sedimentation magnetic ring (1) are folded, all the positioning nails (3) are ensured to be inserted into the circular holes of the sedimentation sleeve (6), and the spring legs (2) are firmly bound on the sedimentation sleeve (6) by using the binding ropes (7);
s5, sequentially finishing the binding and fixing work of all the layered settlement magnetic rings (1), and fixing a magnetic ring without a spring leg (2) at the bottom of a settlement sleeve (6) by using a positioning ring to serve as a basic magnetic ring for layered settlement monitoring;
s6, forming holes at the position where the layered settlement monitoring of the soil body is to be carried out by using a drilling machine, wherein the depth of the formed holes is slightly smaller than the designed buried depth of the settlement sleeve (6) according to the property of the lowest soil layer (4), and the diameter of the drilled holes (5) is comprehensively determined according to the diameter of the layered settlement magnetic ring (1), the hole filling mode and the hole filling material;
s7, after the hole is drilled in place, the sedimentation sleeve (6) with the magnetic rings fixed well is placed into the hole section by section, the sections of the sedimentation sleeve (6) need to be firmly connected, the phenomenon that the sections are loosened and even fall off in the embedding process and the subsequent monitoring process is avoided, and the pull ropes (9) on each layered sedimentation magnetic ring (1) are arranged according to the embedding sequence in the placement process, so that the pull ropes are prevented from being pulled or wound by force;
s8, after the sedimentation sleeve (6) is lowered to the bottom of the drill hole (5), the sedimentation sleeve (6) is pressed at the hole opening through manpower or equipment, and the bottom end of the sedimentation sleeve (6) enters undisturbed soil to the designed depth;
s9, pulling the pull ropes (9) bound on the round pull rings of the bundle loosening components (8) of each layered settlement magnetic ring (1) in sequence from bottom to top on the ground, enabling the spring legs (2) on each layered settlement magnetic ring (1) to be sequentially sprung open, enabling the free ends of the spring legs (2) to be capable of penetrating into the undisturbed soil body on the side wall of the drill hole (5) due to high elasticity, and particularly paying attention to the fact that the pull ropes (9) of the layered settlement magnetic rings (1) on the lower portion are pulled out of the ground completely and then pulling the pull ropes (9) of the layered settlement magnetic rings (1) on the upper portion, so that the pull ropes (9) are prevented from being wound with each other;
s10, after the spring legs (2) of all layered settlement magnetic rings (1) are bounced open, hole sealing is carried out in the modes of slurry injection, sand filling, clay ball filling and the like according to the characteristics of the soil layer (4), the hole sealing quality must be strictly controlled, and the phenomenon that the physical and mechanical properties of the filler and the surrounding soil layer (4) are too large in difference is avoided;
s11, after backfilling is finished, arranging a protective cover at an orifice to prevent a hole from being damaged or prevent impurities from entering a sedimentation sleeve (6);
s12, during measurement, the protective cover is opened, and the layered settlement magnetic rings (1) at all positions are subjected to reciprocating test for not less than 3 times by using a layered settlement magnetic ring instrument.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118258358A (en) * | 2024-05-31 | 2024-06-28 | 泰山学院 | Ground subsidence measuring equipment based on land investigation |
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| CN115110511A (en) * | 2022-06-23 | 2022-09-27 | 中交第一航务工程勘察设计院有限公司 | Automatic monitoring devices is subsided on breakwater shore protection foundation top layer and layering |
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| CN202124851U (en) * | 2011-06-08 | 2012-01-25 | 水利部交通运输部国家能源局南京水利科学研究院 | Combined type layering settlement magnetic ring |
| CN106592564A (en) * | 2016-09-20 | 2017-04-26 | 中国电力科学研究院 | Soil mass layered settlement magnet ring and soil mass layered settlement monitoring device |
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