CN113958309A - Bored concrete pile hole straightness and aperture finder that hangs down - Google Patents
Bored concrete pile hole straightness and aperture finder that hangs down Download PDFInfo
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- CN113958309A CN113958309A CN202111218582.7A CN202111218582A CN113958309A CN 113958309 A CN113958309 A CN 113958309A CN 202111218582 A CN202111218582 A CN 202111218582A CN 113958309 A CN113958309 A CN 113958309A
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- 238000000034 method Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/08—Measuring diameters or related dimensions at the borehole
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Paleontology (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention provides a hole verticality and aperture checker for a bored pile. The tester comprises a base, supporting legs, a measuring rod, a spring, a movable rod and a pressing rod, wherein a groove is formed in the base, horizontal scale marks are arranged beside the groove, and the pressing rod penetrates through the groove; the bottom of the pressing rod is provided with a first connecting device, the movable rod is provided with a second connecting device, and the second connecting device is arranged below the first connecting device; a plurality of measuring rods are circumferentially distributed; the top end of the measuring rod is hinged with the first connecting device, the springs correspond to the measuring rod one by one, and the springs are connected with the second connecting device and the measuring rod; vertical scale marks are arranged on the pressing rod. Compared with the prior art, the invention does not need to take out the tester for readjustment and other redundant steps because of incomplete bonding when measuring the verticality; meanwhile, the value of the aperture is measured by the horizontal scale marks on the base, so that the operation is easier and the reading is convenient.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a bored pile hole perpendicularity and aperture tester, which is suitable for measuring the perpendicularity of a bored pile hole in construction.
Background
The bored pile is directly formed into a hole on the pile position, the reinforcement cage framework is hung in the hole Regula. The construction process is simple, can adapt to the change of stratum, does not need to connect piles, and the reinforcement cage and the concrete can be processed and delivered in a centralized way, also can be processed on site, the operation is convenient, the noise and the vibration are small during the construction, and the pile which is much larger than the diameter of the precast pile can be built, and can be used on various foundations, and the construction process does not need large-scale equipment, and has the advantages of fast progress, mature process, safety and reliability. The cast-in-situ bored pile has been widely used in the foundations of structural engineering such as highways, railroad bridges and the like due to the mature construction process, high bearing capacity and wide application range. The quality of the cast-in-situ bored pile directly relates to the quality and safety of the whole structure, and in the cast-in-situ bored pile construction process, if the pile hole is inclined, the steel reinforcement cage cannot be placed to the bottom, and the guide pipe cannot be placed, so that the verticality of the pile hole must meet the design requirement in order to ensure the bearing capacity of the pile foundation.
At present, a steel reinforcement cage hole inspection device and an ultrasonic reflection technology are commonly adopted in engineering to detect the perpendicularity of a bored pile hole. The detection method of the steel reinforcement cage hole detecting device is relatively original and rough, the perpendicularity of the drilled hole can be reflected very visually through an ultrasonic detection method, but the equipment cost is high and the steel reinforcement cage hole detecting device is not easy to carry.
Prior art, such as patent publication No.: the simple concrete drill core hole verticality detector disclosed in CN209840938U needs to measure the hole diameter firstly during detection, then adjusts the length of the adjusting device according to the hole diameter, enables the attaching rod to be tightly attached to the hole wall, and observes data on the measuring device. If when finding that the aperture measurement is inaccurate or the aperture also changes because of the change of the hole height, the fitting rod can not be tightly attached to the hole wall, the detector needs to be taken out to readjust the length of the adjusting device, and the operation steps are complicated and the measurement error is large.
For another example, patent publication No. CN212129261U discloses a verticality tester for bored pile holes, which uses a scale to attach to the hole wall to obtain verticality, so that the error of the measuring method is large.
Disclosure of Invention
The invention aims to provide a drilling cast-in-place pile hole verticality and aperture tester convenient for measurement.
The technical scheme of the invention is as follows: a bored pile hole verticality and aperture checker comprises a base and supporting legs arranged at the bottom of the base, wherein a through groove is formed in the base, horizontal scale marks are arranged on the side of the groove, the bored pile hole verticality and aperture checker further comprises a measuring rod, a spring, a movable rod and a pressing rod which is axially displaced relative to the movable rod, and the pressing rod penetrates through the groove; the bottom of the pressing rod is provided with a first connecting device, the movable rod is provided with a second connecting device, and the second connecting device is arranged below the first connecting device; a plurality of measuring rods are circumferentially distributed; the top end of the measuring rod is hinged with the first connecting device, the springs correspond to the measuring rod one by one, and the springs are connected with the second connecting device and the measuring rod; vertical scale marks are arranged on the pressing rod.
In the scheme, after the checker is arranged above the pile hole, the measuring rod can be opened or closed by moving the pressing rod downwards, and the measuring rod can be attached to the wall of the pile hole when being opened; redundant steps of taking out the tester for readjustment and the like due to incomplete bonding when the verticality is measured are not needed; meanwhile, the value of the aperture is measured by the horizontal scale marks on the base, so that the operation is easier and the reading is convenient.
And this application has adopted a plurality of measuring staff that are the circumference setting, and it all laminates with the pore wall, can guarantee the straightness that hangs down of movable rod and pressure bar betterly, makes the straightness reading error that hangs down of its output little.
Preferably, the movable rod is magnetically connected with the pressing rod. When no external force exists, the two are bonded and can move up and down together; when external force is applied, if the measuring rod needs to be opened, the pressing rod overcomes the displacement of the magnetic force along the movable rod, and no additional limiting structure exists, so that the convenience of operation is realized.
For convenient reading, the bored concrete pile hole verticality and aperture checker further comprises a fixing device, the fixing device is connected with the base in a sliding mode, and a clamping groove used for clamping and pressing the pressing rod is formed in the fixing device.
Preferably, the first connecting device comprises a first body and mounting plates uniformly distributed along the periphery of the first body, a first through hollow cavity is formed in the first body, the movable rod penetrates through the first hollow cavity, and the pressing rod is fixed with the body; the measuring rod is hinged with the mounting plate.
Preferably, the second connecting device comprises a second body and buckles uniformly distributed on the periphery of the second body, the second body is provided with a through second hollow cavity, the movable rod penetrates through the second hollow cavity and is fixed with the second connecting device, and the spring is connected with the buckles.
Preferably, the ring buckle is a rectangular ring or a semicircular ring. The spring is not only beneficial to the connection of the spring, but also beneficial to the processing; the weight is reduced while the material is saved.
Preferably, the movable rod is provided with vertical scale marks.
Preferably, the fit clearance between the pressing rod and the groove is 0-1.5 mm.
Preferably, the bottom end of the measuring rod is provided with a plane attached to the inner wall of the pile hole. Due to the planar arrangement, the measuring rod can be well attached to the inner wall of the hole, so that the movable rod and the pressing rod are in a vertical state.
Preferably, the supporting leg comprises a cylinder and a cone arranged at the tail end of the cylinder, and the cylinder is fixedly connected with the base. The conical body can be quickly inserted into soil around the pile hole to fix the base.
Compared with the related technology, the invention has the beneficial effects that:
the device has the advantages that the structure is simple, the cost is low, the carrying is easy, the data reading is not influenced by the position of the base, the data reading is convenient, the verticality and the aperture of the bored pile hole can be accurately measured, and the quality problem caused by the fact that the verticality and the aperture of the pile hole do not accord with the standard can be avoided;
secondly, the base structure is fully utilized, and the transverse scale marks are arranged on the base structure, so that reading is facilitated, and errors in measurement are reduced;
and thirdly, the base is placed above the pile hole, and all measuring steps can be completed only by moving the graduated scale, so that the measuring operation is facilitated and the operation steps are simplified.
Drawings
FIG. 1 is a schematic structural diagram of a bored pile hole perpendicularity and bore diameter tester provided by the present invention;
FIG. 2 is a schematic top view of the base of FIG. 1;
FIG. 3 is a schematic view of the first connecting means of FIG. 1;
FIG. 4 is a schematic top view of the structure of FIG. 3;
FIG. 5 is a schematic view of the second connecting device of FIG. 1;
FIG. 6 is a schematic top view of the structure of FIG. 5;
fig. 7 is a schematic structural view of the fixing device in fig. 1.
In the drawings: 1. a base; 10. a groove; 11. horizontal scale lines; 2. a support leg; 21. a cylinder; 22. a cone; 3. a movable rod; 4. a first connecting means; 41. a first hollow cavity; 42. mounting a plate; 43. a first body; 5. a pressing lever; 51. vertical scale lines; 6. a measuring rod; 61. a plane; 7. a second connecting means; 71. a second hollow cavity; 72. looping; 73. a second body; 8. a spring; 9. a fixing device; 91. clamping a plate; 92. a clamping groove.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
As shown in fig. 1, the bored pile hole verticality and aperture checker provided by the present embodiment includes a base 1, a leg 2, a movable rod 3, a first connecting device 4, a pressing rod 5, a measuring rod 6, a second connecting device 7, a spring 8, and a fixing device 9.
As shown in fig. 2, the base 1 is a rectangular, slender plate-like structure, and a groove 10 penetrating vertically (in the thickness direction) is formed therein. Horizontal scale marks 11 are arranged on two sides of the groove 10, and the horizontal scale marks 11 are positioned on the upper surface of the top of the base 1.
The left side and the right side of the bottom of the base 1 are provided with the supporting legs 2, each supporting leg 2 comprises a cylinder 21 and a cone 22, the cylinders 21 are fixed with the base 1 in a welding mode, and the cones 22 are connected to the tail ends of the cylinders 21.
The pressing rod 5 is hollow, the movable rod 3 penetrates through the pressing rod 5, and the length of the movable rod 3 is longer than that of the pressing rod 5. The pressing rod 5 is axially displaceable relative to the movable rod 3. The cross sections of the pressing rod 5 and the movable rod 3 are both rectangular. The pressing rod 5 is made of a magnetic material, and the movable rod 3 is made of an iron rod, so that the pressing rod 5 and the movable rod 3 move together.
The pressing rod 5 penetrates through the groove 10, and the fit clearance between the pressing rod and the groove is 0-1.5 mm. The width of the groove 10 matches the width of the pressing lever 5 (the width refers to a direction perpendicular to the base length in fig. 2). The mating fingers are of close size and have a small fit clearance to prevent the press bar 5 from shifting within the groove 10. The bottom of the pressing rod 5 is provided with a first connecting device 4, the movable rod 3 is provided with a second connecting device 7, and the second connecting device is arranged below the first connecting device 4. The measuring rod 6 is circumferentially provided with a plurality of (three in the embodiment). The top end of the measuring rod 6 is hinged with the first connecting device 4, and the bottom end of the measuring rod is provided with a plane 61 attached to the inner wall of the pile hole. The springs 8 correspond to the measuring rods 6 one by one, and the springs 8 are connected with the second connecting device 7 and the measuring rods 6. The pressing rod 5 is provided with vertical scale lines 51, so that the distance between the pressing rod 5 and the movable rod 3 when moving together can be read. The movable rod 3 is also provided with scale marks, so that the up-and-down moving distance of the pressing rod 5 can be read. The graduation marks are all arranged above the base 1.
As shown in fig. 3 and 4, the first connecting device 4 includes a first body 43 and mounting plates 42 uniformly distributed along the outer periphery of the first body 43. In the present embodiment, the mounting plates 42 are three in number and are spaced apart at an angle of 120 °. The first body 43 is provided with a first through hollow cavity 41, the movable rod 3 penetrates through the first hollow cavity 41, and the pressing rod 5 is fixed with the body 43. The measuring rod 6 is hinged with the mounting plate 42 through screws.
As shown in fig. 5 and 6, the second connecting device 7 includes a second body 73 and buckles 72 uniformly distributed along the outer periphery of the second body 73, and the number and positions of the buckles 72 correspond to the springs 8 one by one. The ring buckle 72 is a rectangular ring or a semicircular ring. The second body 73 is provided with a through second hollow cavity 71, the movable rod 3 penetrates through the second hollow cavity 71 and is fixed with the second connecting device 7, and the spring 8 is connected with the ring buckle 72.
In use, the spring 8 is oriented horizontally when said spring 8 is connected to the second connecting means 7, and said spring 8 is oriented vertically to the movable bar 3.
The original length of the spring 8, the distance between the second connecting means 7 and the first connecting means 4, the length of the measuring rod 6 from the position where the spring 8 is connected to the position of the first connecting means 4 and the length of the measuring rod 6 are designed.
As shown in fig. 2 and 7, the fixing device 9 is fixed on the base 1, specifically, two sides of the fixing device 9 are provided with clamping plates 91, and the clamping plates 91 are clamped on the outer side wall of the width of the base 1, so that the fixing device 9 can slide along the length of the base 1. And a clamping groove 92 for clamping the pressing rod 5 is arranged on one side of the clamping plate 91. When the fixing device 9 is installed, the locking groove 92 faces the pressing rod 5.
When the inspection structure is used, after the pressing rod 5 is in place, the fixing device 9 fixes the pressing rod 5 through the clamping groove 92, so that the reading is convenient, and meanwhile, the measuring rod 6 is kept in an outward opening state without being influenced by the tension of the spring 8.
The working principle of the bored pile hole verticality and aperture checker is as follows: the checker is placed above the pile hole, the pressing rod 5 moves downwards, the measuring rod 6 abuts against the wall of the pile hole, and the reading of the horizontal scale mark 11 on the base 1 is read as x1Reading the vertical scale mark 51 on the pressing rod 5 as y1(ii) a The pressing rod 5 and the movable rod 3 move upwards or downwards together, the measuring rod 6 abuts against the hole wall, and the reading of the horizontal scale mark 11 on the base 1 is read as x2The reading on the pressing rod 5 is y2Then, then
Where i is the perpendicularity. Multiple values of y and x can also be measured, making the measured verticality more accurate.
After the measuring rod 6 abuts against the hole wall for the first time, the distance b of the downward movement of the pressing rod 5 can be read from the scale marks on the movable rod 3, the measuring rod 6, the spring 8 and the movable rod 3 still form a right-angled triangle, and the size of the hole diameter can be obtained by utilizing the pythagorean theorem and the similar triangle principle.
The detector for the verticality and the aperture of the bored pile hole can conveniently measure the verticality and the aperture of the drilled hole, and has the advantages of simple structure, low cost, light weight, convenience in carrying, wide application range and convenience in use.
After the detector is arranged above the pile hole, the pressing rod is moved downwards to realize the joint of the measuring rod and the hole wall, redundant steps of taking out the detector for readjustment and the like due to incomplete joint when the verticality is measured are not needed, and the value of the hole diameter is measured at the same time, so that the operation is easier and the reading is convenient.
A plurality of points can be measured by moving the movable rod and the pressing rod up and down left and right, and more accurate perpendicularity and aperture can be obtained according to the measured data of the points.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A hole perpendicularity and aperture checker for a bored pile comprises a base (1) and supporting legs (2) arranged at the bottom of the base (1), wherein a through groove (10) is formed in the base (1), horizontal scale marks (11) are arranged on the side of the groove (10), the checker is characterized by further comprising a measuring rod (6), a spring (8), a movable rod (3) and a pressing rod (5) which is axially displaced relative to the movable rod (3), and the pressing rod (5) penetrates through the groove (10); a first connecting device (4) is arranged at the bottom of the pressing rod (5), a second connecting device (7) is arranged on the movable rod (3), and the second connecting device is arranged below the first connecting device (4); a plurality of measuring rods (6) are circumferentially distributed; the top end of the measuring rod (6) is hinged with the first connecting device (4), the springs (8) correspond to the measuring rods (6) one by one, and the springs (8) are connected with the second connecting device (7) and the measuring rods (6); vertical scale marks (51) are arranged on the pressing rod (5).
2. The bored pile hole verticality and aperture checker according to claim 1, wherein the movable rod (3) and the pressing rod (5) are magnetically connected.
3. The bored pile hole perpendicularity and aperture checker according to claim 1, further comprising a fixing device (9), wherein the fixing device (9) is slidably connected with the base (1), and a clamping groove (92) for clamping the pressing rod (5) is formed in the fixing device (9).
4. The bored pile hole verticality and aperture checker according to claim 1, wherein the first connecting device (4) comprises a first body (43) and mounting plates (42) uniformly distributed along the periphery of the first body (43), a first hollow cavity (41) is formed in the first body (43) and penetrates through the first hollow cavity (41), the movable rod (3) penetrates through the first hollow cavity (41), and the pressing rod (5) is fixed to the body (43); the measuring rod (6) is hinged with the mounting plate (42).
5. The bored pile hole verticality and aperture checker according to claim 1, wherein the second connecting device (7) includes a second body (73) and buckles (72) evenly distributed along the periphery of the second body (73), a through second hollow cavity (71) is provided on the second body (73), the movable rod (3) passes through the second hollow cavity (71) and is fixed with the second connecting device (7), and the spring (8) is connected with the buckles (72).
6. The bored pile hole verticality and aperture checker according to claim 5, wherein the ring-fastener (72) is a rectangular ring or a semicircular ring.
7. The bored pile hole verticality and aperture checker according to claim 1, wherein the movable rod (3) is provided with vertical scale lines.
8. The bored pile hole verticality and aperture checker according to claim 1, wherein a fit clearance between the pressing rod (5) and the groove (10) is 0-1.5 mm.
9. The bored pile hole verticality and aperture checker according to claim 1, wherein the bottom end of the measuring rod (6) is provided with a plane (61) attached to the inner wall of the pile hole.
10. The bored pile hole verticality and aperture checker according to claim 1, wherein the leg (2) comprises a cylinder (21) and a cone (22) at the end of the cylinder (21), the cylinder (21) is fixedly connected with the base (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111218582.7A CN113958309B (en) | 2021-10-20 | 2021-10-20 | Bored pile stake hole straightness that hangs down and aperture inspection ware |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111218582.7A CN113958309B (en) | 2021-10-20 | 2021-10-20 | Bored pile stake hole straightness that hangs down and aperture inspection ware |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113958309A true CN113958309A (en) | 2022-01-21 |
| CN113958309B CN113958309B (en) | 2024-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111218582.7A Active CN113958309B (en) | 2021-10-20 | 2021-10-20 | Bored pile stake hole straightness that hangs down and aperture inspection ware |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009002809A (en) * | 2007-06-21 | 2009-01-08 | System Keisoku Kk | Hole wall measuring device |
| CN203795484U (en) * | 2014-03-21 | 2014-08-27 | 浙江嘉兴福达建设股份有限公司 | Pile hole detecting device |
| CN206888038U (en) * | 2017-06-26 | 2018-01-16 | 江苏鸿成工程项目管理有限公司 | A kind of stake holes hole diameter detection apparatus |
| CN109357592A (en) * | 2018-11-28 | 2019-02-19 | 中冶建工集团有限公司 | Artificial digging pile stake diameter and testing apparatus for verticality |
| CN210002455U (en) * | 2019-03-01 | 2020-01-31 | 广西壮族自治区地质环境监测总站 | major diameter bored concrete pile straightness and aperture detection device that hangs down |
| CN113090250A (en) * | 2021-04-13 | 2021-07-09 | 中国十七冶集团有限公司 | Hole detector for cast-in-situ bored pile |
-
2021
- 2021-10-20 CN CN202111218582.7A patent/CN113958309B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009002809A (en) * | 2007-06-21 | 2009-01-08 | System Keisoku Kk | Hole wall measuring device |
| CN203795484U (en) * | 2014-03-21 | 2014-08-27 | 浙江嘉兴福达建设股份有限公司 | Pile hole detecting device |
| CN206888038U (en) * | 2017-06-26 | 2018-01-16 | 江苏鸿成工程项目管理有限公司 | A kind of stake holes hole diameter detection apparatus |
| CN109357592A (en) * | 2018-11-28 | 2019-02-19 | 中冶建工集团有限公司 | Artificial digging pile stake diameter and testing apparatus for verticality |
| CN210002455U (en) * | 2019-03-01 | 2020-01-31 | 广西壮族自治区地质环境监测总站 | major diameter bored concrete pile straightness and aperture detection device that hangs down |
| CN113090250A (en) * | 2021-04-13 | 2021-07-09 | 中国十七冶集团有限公司 | Hole detector for cast-in-situ bored pile |
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| CN113958309B (en) | 2024-04-26 |
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