CN109612373B - Detection device for sediment at bottom of hole and detection method using detection device - Google Patents
Detection device for sediment at bottom of hole and detection method using detection device Download PDFInfo
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- CN109612373B CN109612373B CN201811635704.0A CN201811635704A CN109612373B CN 109612373 B CN109612373 B CN 109612373B CN 201811635704 A CN201811635704 A CN 201811635704A CN 109612373 B CN109612373 B CN 109612373B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/18—Measuring arrangements characterised by the use of mechanical techniques for measuring depth
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Abstract
The invention relates to a detection device for sediment at the bottom of a hole and a detection method using the detection device, wherein the detection device comprises a measuring hammer, a measuring rod fixed on the measuring hammer and a traction rope fixed at one end of the measuring rod far away from the measuring hammer, the measuring hammer and the measuring rod are coaxially arranged, and the area of the measuring hammer at one side close to the measuring rod is larger than the area of the measuring rod at one side close to the measuring hammer; a measuring plate is slidably sleeved outside the measuring rod, and the area enclosed by one side of the measuring plate close to the measuring rod is smaller than the area of one side of the measuring hammer close to the measuring rod; the inside locking assembly that is used for locking survey board and measuring staff relative position that adds of survey board, and fixed stay cord that is used for driving the locking assembly on the locking assembly, the stay cord passes the survey board setting. According to the invention, the measuring plate is sleeved outside the measuring rod, the measuring plate can suspend on the upper surface of the hole bottom slagging, and the position locking of the measuring plate and the measuring rod is realized by pulling the pull rope, so that the distance between the measuring plate and the measuring hammer is the depth of the hole bottom slagging, and the measuring accuracy is improved.
Description
Technical Field
The invention relates to the technical field of building construction measurement, in particular to a hole bottom sediment detection device and a detection method using the same.
Background
The construction process of the bored pile is to form holes in the soil foundation and then to put a reinforcement cage for concrete pouring. And during the pore-forming process, the sediment at the bottom of the pore is inevitable. The sediment at the bottom of the hole is sediment which is left by the sediment or hole collapse in the process of drilling and cleaning the hole and is not taken away by the circulating mud. And the bottom of the hole sediment is generally coarser particles.
The presence of the bottom sediment affects the bearing capacity of the solidified pile, and therefore the depth of the bottom sediment needs to be measured to determine whether it is within a proper range. If the range is exceeded, the sediment needs to be cleaned; the subsequent construction can be carried out without exceeding the addition range.
The existing method for measuring the sediment at the bottom of the hole is to place a measuring hammer into a pile hole through a rope and slowly place the measuring hammer when the measuring hammer reaches the bottom of the pile, because the sediment is coarse particles, when the measuring hammer enters the sediment, an operator records the position corresponding to the top of a drilled hole on the rope at one time. Then with lower measuring hammer again, shake from top to bottom simultaneously, when measuring hammer sinks to the hole bottom completely, operating personnel carries out the record once more with the position that the drilling top corresponds on the rope. The distance between the two recordings is settled.
The above prior art solutions have the following drawbacks: because the judgment of whether the measuring hammer enters the slag formation or not by the operator has a great subjective factor, that is to say, the results of the hole bottom sediment in the same pile hole measured by different people are different, the accuracy of the detection result is low, and the construction quality in the later period is directly influenced.
Disclosure of Invention
The invention aims to provide a device for detecting hole bottom sediments, which can improve the measurement accuracy.
The above object of the present invention is achieved by the following technical solutions:
the device for detecting the sediment at the bottom of the hole comprises a measuring hammer, a measuring rod fixed on the measuring hammer and a traction rope fixed at one end of the measuring rod, which is far away from the measuring hammer, wherein the measuring hammer and the measuring rod are coaxially arranged, and the area of the measuring hammer, which is close to the measuring rod, is larger than the area of the measuring rod, which is close to the measuring hammer; a measuring plate is slidably sleeved outside the measuring rod, and the area enclosed by one side of the measuring plate close to the measuring rod is smaller than the area of one side of the measuring hammer close to the measuring rod; the measuring plate is internally provided with a locking assembly used for locking the relative position of the measuring plate and the measuring rod, a pull rope used for driving the locking assembly is fixed on the locking assembly, and the pull rope penetrates through the measuring plate.
By adopting the technical scheme, when the measuring hammer is placed at the bottom of the pile hole, the measuring plate can be abutted against the upper surface of the sediment at the bottom of the hole due to the fact that the area of the measuring plate is large. And pulling the pull rope to enable the locking assembly to lock the relative position of the measuring plate and the measuring rod. And then pulling the traction rope to enable the measuring hammer to be far away from the pile hole, and measuring the vertical distance from one end of the measuring hammer, far away from the measuring plate, to one side of the measuring plate, close to the measuring hammer, to obtain the depth of the sediment at the bottom of the hole. The relative position of the measuring plate and the measuring rod is locked, and the measuring hammer is always kept vertical under the automatic action, so that the accuracy of the measuring result is improved.
The invention is further configured to: the locking assemblies are arranged in the measuring plate and at least two locking assemblies are arranged around the measuring rod; the locking assembly comprises an arc-shaped plate and a transmission assembly which is connected to the arc-shaped plate and used for pushing the arc-shaped plate, magnets are fixed at two end parts of the arc-shaped plate, and the magnets between two adjacent arc-shaped plates are matched in a magnetic attraction manner; the transmission assembly comprises a transmission rod rotatably connected to the arc-shaped plate and a lever rotatably connected to one end, far away from the arc-shaped plate, of the transmission rod, and a support is additionally arranged between the lever and the measuring plate; a spring is fixed between one end of the lever, which is far away from the transmission rod, and the measuring plate, and the end of the lever is fixed with the pull rope; when the pull rope is pulled, the arc-shaped plates are close to the measuring rod, and all the arc-shaped plates are fixed by magnetic attraction and are tightly propped against the outer wall of the measuring rod.
Through adopting above-mentioned technical scheme, when the pulling stay cord upwards, the one end upward movement of lever far away from the transfer line for the projection of lever on the survey board is elongated, thereby promotes the transfer line and is close to the measuring staff. The drive rod gradually tends to be horizontal, so that the projection of the drive rod on the measuring panel is elongated. Under the combined action of the lever and the transmission rod, the arc-shaped plate is close to the measuring rod, so that the magnets on the arc-shaped plate are mutually attached and fixed, and the operation is convenient and fast.
The invention is further configured to: the measuring plate is internally provided with a moving groove and a mounting groove which are communicated with each other, the locking assembly is positioned in the mounting groove, and the arc-shaped plate is in sliding fit along the moving groove; the surface of the arc plate is attached to the inner wall of the moving groove.
Through adopting above-mentioned technical scheme for the arc can carry out the closure of certain degree to the notch of mounting groove, thereby reduces the entering of filths such as external mud, protects the locking subassembly in the mounting groove.
The invention is further configured to: and a friction plate is fixed on one side of the arc-shaped plate, which faces the measuring rod.
Through adopting above-mentioned technical scheme, when the arc amalgamation formed a complete annular, the friction plate supported tightly on the measuring staff outer wall to increased the frictional force between measuring plate and the measuring staff, and then increased the joint strength between measuring plate and the measuring staff, thereby improved measuring accuracy.
The invention is further configured to: and a lifting ring is fixed at one end of the measuring rod, which is far away from the measuring hammer, and the traction rope is bound on the lifting ring.
Through adopting above-mentioned technical scheme, when needs take out the survey board from the measuring staff, remove the haulage rope from rings earlier. Then the force is applied to the arc-shaped plates, so that the arc-shaped plates are far away from each other, and the locking between the measuring plate and the measuring rod is released. Then move the survey board and make along the measuring staff from the tip of measuring staff break away from the measuring staff, and then conveniently maintain and inspect the structure of survey board ability. And, according to the individual measuring demand of the stake hole degree of depth of difference, select the haulage rope of different thicknesses to use, convenient operation is swift.
The invention is further configured to: scales are additionally arranged on the measuring rod, the starting points of the scales are located at the junction of the measuring rod and the measuring hammer, and the starting values of the scales are the length of the measuring hammer.
Through adopting above-mentioned technical scheme, the degree of depth that the hole bottom becomes the sediment can be obtained to the scale on the direct observation measuring staff, has improved measurement of efficiency greatly, and then improves later stage efficiency of construction. And the error caused in the measuring process is reduced, and the measuring accuracy is improved.
The second purpose of the invention is to provide a detection method.
The second aim of the invention is realized by the following technical scheme:
a method of detection comprising the steps of:
s1, applying force to the traction rope to lower the measuring hammer into the pile hole;
s2, when the pulling rope can not be placed down, the pulling rope is shaken up and down until the position of the measuring hammer is unchanged;
s3, pulling the pull rope to enable the arc blocks to approach each other and fix the arc blocks in a magnetic attraction manner, and fixing the relative positions of the measuring plate and the measuring rod; and (4) pulling the traction rope upwards, and measuring the vertical distance from one end of the measuring hammer, which is far away from the measuring plate, to one side of the measuring plate, which is close to the measuring hammer, to obtain the depth of the sediment at the bottom of the hole.
Through adopting above-mentioned technical scheme, inside operating personnel held the haulage rope and put into the stake hole with the survey hammer, the upper and lower shake haulage rope can be convenient for the survey hammer and enter into inside the hole bottom sediment.
The invention is further configured to: in S1, a first fixed pulley is fixed near the pile hole, an end of the first fixed pulley is located on a central axis of the pile hole, and the traction rope is pulled by the first fixed pulley and enters the pile hole.
Through adopting above-mentioned technical scheme, pull the haulage rope for the haulage rope aligns with the axis in stake hole all the time, thereby improves measuring result's accuracy.
The invention is further configured to: in S1, before lowering the measuring hammer, erecting a winding pier in the vicinity of the pile hole, wherein the winding pier comprises a fixed column fixed on the soil layer and a line roller rotatably connected to the fixed column through a bearing; one end of the pull rope, which is far away from the measuring plate, is fixed on the wire roller, and the pull rope is wound on the wire roller.
Through adopting above-mentioned technical scheme, prevent that the stay cord tip from entering into inside the stake hole, lead to doing over again. And, transfer the in-process at the haulage rope, thereby the stay cord also can enter into the inside drive line roller rotation of stake hole. Because the acting force of the rotation of the driving wire roller is small, the elastic force given to the lever by the spring cannot be offset, and the arc-shaped plates cannot be fixed mutually.
The invention is further configured to: in S1, the second fixed pulley is fixed near the pile hole, and the rope is pulled by the second fixed pulley into the pile hole.
Through adopting above-mentioned technical scheme, pull the stay rope and pull inside rope synchronous entry pile hole of being convenient for.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the measuring plate is sleeved outside the measuring rod, the measuring plate can be suspended on the upper surface of the hole bottom slagging, and the position of the measuring plate and the measuring rod is locked by pulling the pull rope, so that the distance between the measuring plate and the measuring hammer is the depth of the hole bottom slagging, errors caused by the fact that an operator manually senses the moment when the measuring hammer enters the slagging are avoided, and the measuring accuracy is improved;
2. set up first fixed pulley and second fixed pulley on the soil layer that closes on the stake hole, conveniently lead haulage rope and stay cord to improve measuring efficiency.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a sectional view along the axial direction of the blade.
Fig. 3 is a cross-sectional view taken perpendicular to the axial direction of the blade.
FIG. 4 is a partial schematic view of FIG. 3
Fig. 5 is an enlarged view of a portion B of fig. 1.
In the figure, 1, a measuring hammer; 2. a measuring rod; 21. a hoisting ring; 3. a hauling rope; 4. measuring a plate; 41. a moving groove; 42. mounting grooves; 5. a locking assembly; 51. an arc-shaped plate; 511. a magnet; 512. a friction plate; 513. a force application notch; 52. a transmission assembly; 521. a transmission rod; 522. a lever; 6. a spring; 7. pulling a rope; 8. winding piers; 81. fixing a column; 82. a wire roller; 9. a first fixed pulley; 10. and a second fixed pulley.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the invention discloses a detection method for detecting the depth of sediment at the bottom of a hole by using a detection device, wherein the detection device comprises a measuring hammer 1, a measuring rod 2 fixed on the measuring hammer 1 and a traction rope 3 fixed at one end of the measuring rod 2 far away from the measuring hammer 1.
The measuring hammer 1 and the measuring rod 2 are coaxially arranged, and one side, away from the measuring rod 2, of the measuring hammer 1 is in a pointed part arrangement, so that the measuring hammer is convenient to insert into the hole bottom sediment. The cross-sections of the measuring hammer 1 and the measuring rod 2 are circular, and the area of the measuring hammer 1 close to one side of the measuring rod 2 is larger than the area of the measuring rod 2 close to one side of the measuring hammer 1.
And a hanging ring 21 is fixed at one end of the measuring rod 2, which is far away from the measuring hammer 1, and the traction rope 3 is bound on the hanging ring 21. The measuring rod 2 is additionally provided with scales, the starting point of the scales is located at the junction of the measuring rod 2 and the measuring hammer 1, and the starting value of the scales is the length of the measuring hammer 1.
Combine fig. 1 and fig. 2, the outside slip cover of measuring staff 2 is equipped with the survey board 4 of disc, and survey board 4 internal diameter is less than the diameter that closes on measuring staff 2 one side on the plummet 1 to make the plummet 1 restrict the range of motion of survey board 4, place the survey board 4 and pass the plummet 1. The inside locking assembly 5 that is used for locking survey board 4 and measuring staff 2 relative position that adds of survey board 4, is fixed with the stay cord 7 that is used for driving locking assembly 5 on the locking assembly 5, and the stay cord 7 passes survey board 4 and sets up. The locking assemblies 5 are provided at least two around the measuring staff 2. In this embodiment, three locking assemblies 5 are provided as an example.
Referring to fig. 3 and 4, one side of the measuring plate 4 adjacent to the measuring bar 2 is recessed inward, a moving groove 41 and a mounting groove 42 communicating with each other are sequentially formed, and each locking assembly 5 is located in the corresponding mounting groove 42.
The locking assembly 5 comprises an arc plate 51 which is matched with the moving groove 41 in a sliding way and a transmission assembly 52 which is connected to the arc plate 51 and is used for pushing the arc plate 51, and when the arc plate 51 slides in the moving groove 41, the surface of the arc plate 51 is attached to the inner wall of the moving plate. The arc plate 51 is a plate body with an arc of 120 degrees, magnets 511 are fixed at two ends of the arc plate 51, and an arc friction plate 512 is fixed at the inner side of the arc plate 51. The magnets 511 on adjacent arc plates 51 are of unlike magnetic poles, so as to be attracted and fixed with each other. When the three arc-shaped plates 51 are spliced, a ring plate sleeved outside the measuring rod 2 is formed, and the friction plate 512 on each arc-shaped plate 51 is tightly propped against the outer wall of the measuring rod 2.
The transmission assembly 52 comprises a transmission rod 521 rotatably connected to the arc-shaped plate 51 and a lever 522 rotatably connected to one end of the transmission rod 521 far away from the arc-shaped plate 51, wherein a support is additionally arranged between the lever 522 and the measuring plate 4, and the support is rotatably connected to the middle position of the lever 522. A spring 6 is fixed between one end of the lever 522, which is far away from the transmission rod 521, and one side of the mounting groove 42, which is close to the measuring hammer 1, in an initial state, the spring 6 is not pulled, and one end of the lever 522, which is connected with the spring 6, is closer to one side of the mounting groove 42, which is fixed with the spring 6, than the other end.
A pull rope 7 is further fixed at one end of the lever 522, which is fixed with the spring 6, and the pull rope 7 passes through one side of the measuring plate 4 away from the measuring hammer 1 and extends to the outside of the mounting groove 42. When the pull rope 7 is pulled, the lever 522 and the transmission rod 521 rotate synchronously to drive the arc-shaped plates 51 to be close to the measuring rod 2, so that the magnets 511 on the three arc-shaped plates 51 are positioned in a distance range capable of being magnetically attracted with each other, the three arc-shaped plates 51 are magnetically attracted and fixed, the friction plate 512 is tightly abutted to the outer wall of the measuring rod 2, and the relative positions of the measuring plate 4 and the measuring rod 2 are locked.
In order to separate the three arc plates 51 after the measurement is finished, a force application notch 513 is formed in one side of each arc plate 51, which is far away from the measuring hammer 1. The operator inserts a tool into the force application notch 513 and pushes the arc plates 51 away from each other, thereby unlocking the lock between the measuring plate 4 and the measuring bar 2.
With reference to fig. 1 and 5, the detection method using the detection device includes the following steps:
and S1, erecting the winding pier 8 near the pile hole, wherein the winding pier 8 comprises a fixed column 81 fixed on the soil layer and a wire roller 82 rotatably connected to the fixed column 81 through a bearing, and the wire roller 82 and the fixed column 81 are coaxially arranged. One end of the pull rope 7 remote from the side plate 4 is fixed to the wire roller 82, and the pull rope 7 is wound around the wire roller 82.
A first fixed pulley 9 and a second fixed pulley 10 are fixed near the pile hole, and the second fixed pulley 10 is arranged near the winding pier 8. The first fixed pulley 9 is arranged opposite to the first fixed pulley 9, and the end of the first fixed pulley 9 is positioned on the central axis of the pile hole.
The measuring rod 2 penetrates through the center of the measuring plate 4, the measuring plate 4 is moved to enable the measuring rod to be abutted against the measuring hammer 1, and meanwhile one side, provided with the pull rope 7, of the measuring plate 4 is located on one side far away from the measuring hammer 1. Then, force is applied to the traction rope 3, so that the traction rope enters the pile hole under the traction of the first fixed pulley 9. Meanwhile, the pulling rope 7 enters the pile hole under the traction of the second fixed pulley 10, and the wire roller 82 rotates so that the pulling rope 7 is paid off. When the traction rope 3 is placed downwards, the traction rope 3 can be wound on the hand crank, so that the labor consumption is reduced.
S2, when the hauling cable 3 can not be placed down, namely the hauling cable 3 is piled up and is not stressed, the hauling cable 3 is shaken up and down until the position of the measuring hammer 1 is unchanged. The hauling cable 3 is tensioned so that the hauling cable 3 is in a tight state, and the hauling cable 3 is bound on a low pier or other objects inserted into the soil layer.
S3, pulling the pull rope 7 to make the three arc-shaped plates 51 (see FIG. 3) approach each other and fix by magnetic attraction, the friction plate 512 is tightly pressed against the outer wall of the measuring rod 2, and the relative position of the measuring plate 4 and the measuring rod 2 is fixed. And (3) pulling the traction rope 3 upwards, and reading the scale of the measuring plate 4 on the measuring rod 2 at the side close to the measuring hammer 1, namely the hole bottom sediment depth.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. The utility model provides a detection apparatus of hole bottom sediment which characterized in that: the device comprises a measuring hammer (1), a measuring rod (2) fixed on the measuring hammer (1) and a traction rope (3) fixed at one end, far away from the measuring hammer (1), of the measuring rod (2), wherein the measuring hammer (1) and the measuring rod (2) are coaxially arranged, and the area of the measuring hammer (1) on one side close to the measuring rod (2) is larger than the area of the measuring rod (2) on one side close to the measuring hammer (1); a measuring plate (4) is slidably sleeved outside the measuring rod (2), and the area enclosed by one side of the measuring plate (4) close to the measuring rod (2) is smaller than the area of one side of the measuring hammer (1) close to the measuring rod (2); a locking assembly (5) used for locking the relative position of the measuring plate (4) and the measuring rod (2) is additionally arranged in the measuring plate (4), a pull rope (7) used for driving the locking assembly (5) is fixed on the locking assembly (5), and the pull rope (7) penetrates through the measuring plate (4); the locking assemblies (5) are arranged in the measuring plate (4) and surround the measuring rod (2) at least two; the locking assembly (5) comprises an arc-shaped plate (51) and a transmission assembly (52) which is connected to the arc-shaped plate (51) and used for pushing the arc-shaped plate (51), magnets (511) are fixed at two end parts of the arc-shaped plate (51), and the magnets (511) between two adjacent arc-shaped plates (51) are in magnetic attraction fit; the transmission assembly (52) comprises a transmission rod (521) rotatably connected to the arc-shaped plate (51) and a lever (522) rotatably connected to one end, far away from the arc-shaped plate (51), of the transmission rod (521), and a support is additionally arranged between the lever (522) and the measuring plate (4); a spring (6) is fixed between one end of the lever (522), which is far away from the transmission rod (521), and the measuring plate (4), and the end of the lever (522) is fixed with the pull rope (7); when the pull rope (7) is pulled, the arc-shaped plates (51) are close to the measuring rod (2), and all the arc-shaped plates (51) are fixed by magnetic attraction and are abutted against the outer wall of the measuring rod (2).
2. The apparatus for detecting sediment at the bottom of a hole of claim 1, wherein: a moving groove (41) and a mounting groove (42) which are communicated with each other are formed in the measuring plate (4), the locking assembly (5) is positioned in the mounting groove (42), and the arc-shaped plate (51) is in sliding fit along the moving groove (41); the surface of the arc-shaped plate (51) is attached to the inner wall of the moving groove (41).
3. The apparatus for detecting sediment at the bottom of a hole of claim 1, wherein: a friction plate (512) is fixed on one side of the arc-shaped plate (51) facing the measuring rod (2).
4. The apparatus for detecting sediment at the bottom of a hole of claim 1, wherein: one end of the measuring rod (2) far away from the measuring hammer (1) is fixed with a hanging ring (21), and the traction rope (3) is bound on the hanging ring (21).
5. The apparatus for detecting sediment at the bottom of a hole of claim 1, wherein: scales are additionally arranged on the measuring rod (2), the starting points of the scales are located at the junction of the measuring rod (2) and the measuring hammer (1), and the initial values of the scales are the length of the measuring hammer (1).
6. An inspection method using the inspection apparatus according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
s1, applying force to the traction rope (3) to lower the measuring hammer (1) into the pile hole;
s2, when the traction rope (3) cannot be lowered, the traction rope (3) is shaken up and down until the position of the measuring hammer (1) is unchanged;
s3, pulling the pull rope (7) to enable the arc blocks to approach each other and fix the arc blocks in a magnetic attraction manner, and fixing the relative positions of the measuring plate (4) and the measuring rod (2); and (3) pulling up the traction rope (3), and measuring the vertical distance from one end of the measuring hammer (1), which is far away from the measuring plate (4), to one side of the measuring plate (4), which is close to the measuring hammer (1), so as to obtain the depth of the sediment at the bottom of the hole.
7. A method of detection as claimed in claim 6, wherein: in the S1, a first fixed pulley (9) is fixed near the pile hole, the end of the first fixed pulley (9) is positioned on the central axis of the pile hole, and the traction rope (3) enters the pile hole through the traction of the first fixed pulley (9).
8. A method of detection as claimed in claim 6, wherein: in the S1, before the measuring hammer (1) is lowered, a winding pier (8) is erected near the pile hole, wherein the winding pier (8) comprises a fixed column (81) fixed on the soil layer and a wire roller (82) rotatably connected to the fixed column (81) through a bearing; one end, far away from the measuring plate (4), of the pull rope (7) is fixed on the wire roller (82), and the pull rope (7) is wound on the wire roller (82).
9. A method of testing as claimed in claim 8, wherein: in S1, the second fixed pulley (10) is fixed near the pile hole, and the rope (7) is pulled by the second fixed pulley (10) and enters the pile hole.
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| CN201811635704.0A CN109612373B (en) | 2018-12-29 | 2018-12-29 | Detection device for sediment at bottom of hole and detection method using detection device |
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| CN201811635704.0A CN109612373B (en) | 2018-12-29 | 2018-12-29 | Detection device for sediment at bottom of hole and detection method using detection device |
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| CN110906850B (en) * | 2019-12-04 | 2021-04-27 | 昆明理工大学 | Accurate positioning device and method for inclined deep hole sensor |
| CN111023949B (en) * | 2020-01-08 | 2021-07-09 | 中国十七冶集团有限公司 | Simple cast-in-place pile hole depth measuring device and implementation method |
| CN112833745A (en) * | 2021-03-28 | 2021-05-25 | 遵义师范学院 | Wide-range multi-probe sediment thickness detection device |
| CN113484100A (en) * | 2021-07-03 | 2021-10-08 | 杭州亚太建设监理咨询有限公司 | Greenhouse gas collecting device |
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