CN112695816A - Foundation pile horizontal load test detection method - Google Patents
Foundation pile horizontal load test detection method Download PDFInfo
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- CN112695816A CN112695816A CN202110033619.2A CN202110033619A CN112695816A CN 112695816 A CN112695816 A CN 112695816A CN 202110033619 A CN202110033619 A CN 202110033619A CN 112695816 A CN112695816 A CN 112695816A
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- 238000012360 testing method Methods 0.000 title claims abstract description 75
- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 50
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000003068 static effect Effects 0.000 abstract description 18
- 238000010276 construction Methods 0.000 abstract description 6
- 239000002689 soil Substances 0.000 abstract description 6
- 238000011068 loading method Methods 0.000 description 11
- 238000012546 transfer Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
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- 238000012544 monitoring process Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
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- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
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- 230000000149 penetrating effect Effects 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
- 238000005303 weighing 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
- E02D33/00—Testing foundations or foundation structures
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention belongs to the technical field of horizontal static load tests of foundation piles, and discloses a method for detecting a horizontal load test of a foundation pile, which aims to solve the problems of high cost and damage to the bearing capacity of undisturbed soil in field construction of a counterforce wall during the horizontal load test of the foundation pile. The invention comprises the following steps: selecting at least two engineering piles as stress action points of a horizontal load test according to the positions of foundation piles; adjusting the length of the force transmission cylinder, abutting a clamping part on the horizontal jack against a foundation pile for horizontal load test detection, and abutting a clamping part on the force transmission cylinder against an engineering pile; displacement sensors are arranged on a stressed horizontal plane of the foundation pile detected by a horizontal load test and a position 40-50cm above the horizontal plane; and starting the horizontal jack to perform horizontal load test detection on the foundation pile.
Description
Technical Field
The invention belongs to the technical field of horizontal static load tests of foundation piles, and particularly relates to a horizontal load test detection method of a foundation pile.
Background
The horizontal load borne by the foundation pile has various forms, and the single-pile horizontal static load test is a test method which is close to the actual working condition of the horizontal load-bearing pile and is used for determining the horizontal critical load and the ultimate load of the single pile and promoting the soil resistance parameter. The method for detecting the horizontal load of the foundation pile mainly comprises a horizontal thrust loading device and a measuring device, wherein the horizontal thrust loading device generally adopts a horizontal hydraulic jack, the loading capacity is 1.2 times larger than the maximum test load, a force sensor is adopted to directly measure the load, a hydraulic meter or a hydraulic sensor of a parallel liquid path can also be used to measure the hydraulic pressure, and the load is converted according to a jack calibration curve. According to the actual stress characteristic of the engineering pile, a unidirectional multi-cycle loading method or a slow-speed load maintaining valve is selected in the single-pile horizontal static load test, and the loading mode of the slow-speed load maintaining method is preferably adopted for the engineering pile bearing the horizontal load for a long time. The horizontal displacement measurement in the measuring device should adopt a large amount of weighing displacement meters, two displacement meters should be installed on the two sides of the detected pile on the horizontal action plane to measure the horizontal displacement of the pile on the ground, when the rotation angle of the pile top needs to be measured, two displacement meters should be installed on the two sides of the detected pile 50cm above the horizontal action plane to obtain the rotation angle of the pile above the bottom surface by using the ratio of the difference between the upper displacement meter and the lower displacement meter and the distance between the displacement meters.
For example, the invention patent with the application number of 201910035479.5 discloses a high-pile compression-resistance, pulling-resistance and horizontal static load test device, which comprises three sub items of compression-resistance, pulling-resistance and horizontal static load tests: the three subitems of the static test equipment of the high pile foundation all comprise three modules: the device comprises a counter-force module, a loading module and a monitoring module. The counter-force module provides resistance to compression, resistance to plucking and horizontal static load test's counter-force support with balanced loading load, and the loading module is used for providing experimental loading, and monitoring module is used for measuring the level or the vertical deformation of high stake in the loading process to judge pile foundation deformation characteristic is used for assessing pile foundation bearing capacity.
For another example, the invention patent with application number 201720162904.3 discloses a horizontal static load test system for applying vertical load on a pile top, which comprises a vertical compression-resistant static load test device and a horizontal static load test device; the loading and pressure stabilizing system of the horizontal static load test device comprises a horizontal jack for applying horizontal load, a jack fixing device and horizontal load measuring instrument equipment, wherein the horizontal jack for applying horizontal load is connected with the vertical compression-resistant static load test pile through the jack fixing device, and the horizontal load measuring instrument equipment is arranged between the horizontal jack for applying horizontal load and the vertical compression-resistant static load test pile); in the horizontal force application process of the horizontal static load test, an anti-friction assembly arranged on the vertical compression-resistant static load test pile top) overcomes the restriction of the vertical load on the horizontal direction of the pile top; the horizontal static load test device comprises a horizontal displacement observation instrument device) which is connected to the vertical compression-resistant static load test pile and the reference beam.
For another example, the invention patent with application number 201920269210.9 discloses a foundation pile horizontal load test detection method, which comprises a testing mechanism and a fixing mechanism, wherein one side of the testing mechanism is provided with a force application mechanism, the force application mechanism comprises a force application rod for applying external force to a single test pile, and the fixing mechanism comprises a fixing ring and an abutting part which are arranged around the outer side of the single test pile; the inner side of the abutting part is uniformly and fixedly provided with a plurality of clamping blocks, the outer surface of one side of the fixing ring, which is far away from the fastening mechanism, is uniformly provided with a plurality of clamping grooves which are matched with the clamping blocks, the abutting part is clamped into the clamping grooves through the clamping blocks, and the outer side of the abutting part is fixedly connected with the stressing rod through a connecting piece; the front side and the rear side of the clamping block are fixedly connected with the inner wall of the clamping groove through a first elastic piece and a second elastic piece respectively.
However, in the prior art, in order to realize the force application of the jack (force application device), a reaction device is required to be arranged, and the reaction device comprises a construction reaction wall and a construction pile, but the reaction wall is time-consuming and labor-consuming in construction and time-consuming and labor-consuming in dismantling; meanwhile, the bearing capacity of the undisturbed soil is easily damaged by the counterforce wall.
Disclosure of Invention
The invention provides a method for detecting the horizontal load test of a foundation pile, aiming at solving the problems of high cost and damage to the bearing capacity of undisturbed soil in site construction of a counterforce wall during the horizontal load test of the foundation pile.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows:
a foundation pile horizontal load test detection method comprises a foundation pile horizontal load test detection device, wherein the foundation pile horizontal load test detection device comprises a counterforce mechanism, the counterforce mechanism comprises a supporting part, the supporting part is connected with at least two force transmission cylinders with adjustable lengths, one end of each force transmission cylinder is connected with the supporting part, the other end of each force transmission cylinder is connected with a spherical hinge, and the spherical hinge is connected with a clamping part which is used for being in contact with an engineering pile and abutting against the engineering pile; one side of the supporting part is connected with the force transmission cylinder, the other side of the supporting part is connected with a horizontal jack, one end of the horizontal jack is connected with the supporting part, the other end of the horizontal jack is connected with a spherical hinge, and a clamping part used for clamping and abutting against a foundation pile for horizontal load test detection is connected onto the spherical hinge;
the method comprises the following steps:
(1) selecting at least two engineering piles as stress action points of a horizontal load test according to the positions of foundation piles;
(2) adjusting the length of the force transmission cylinder, abutting a clamping part on the horizontal jack against a foundation pile for horizontal load test detection, and abutting a clamping part on the force transmission cylinder against an engineering pile;
(3) displacement sensors are arranged on a stressed horizontal plane of the foundation pile detected by a horizontal load test and a position 40-50cm above the horizontal plane;
(4) and starting the horizontal jack to perform horizontal load test detection on the foundation pile.
In some embodiments, a pressure sensor for detecting the pressure is further installed on the clamping portion connected with the horizontal jack.
In some embodiments, the force transmission cylinder comprises a first cylinder body, an adjusting threaded hole is formed in the first cylinder body along the length direction of the first cylinder body, an adjusting screw rod is arranged in the adjusting threaded hole, one end of the adjusting screw rod is inserted into the adjusting threaded hole, and the other end of the adjusting screw rod is rotatably connected with the spherical hinge.
In some embodiments, the force transmission cylinder comprises a first cylinder body, a sliding groove is formed in the first cylinder body along the length direction of the first cylinder body, a sliding rod is arranged on the sliding groove, one end of the sliding rod is matched with the sliding groove, and the other end of the sliding rod is connected with the spherical hinge.
In some embodiments, the horizontal position of the force transfer cylinder on the support portion is adjustable.
In some embodiments, the height positions of the horizontal jack, the support portion and the force transfer cylinder are adjustable.
In some embodiments, the supporting part comprises a cross beam, a plurality of threaded holes are further formed in the cross beam, the force transmission cylinder is in threaded connection with the threaded holes in the cross beam through a screw rod, and the force transmission cylinder is installed on different threaded holes to realize the adjustment of the horizontal position of the force transmission cylinder on the cross beam; or a sliding groove is formed in the cross beam, one end of the force transmission cylinder is matched with the sliding groove and can slide in the sliding groove, and a locking screw and a locking nut used for locking the force transmission cylinder in the sliding groove are arranged on the force transmission cylinder or the cross beam in a matched mode.
In some embodiments, the lower end surfaces of the cross beam, the horizontal jack and the force transmission cylinder are connected with telescopic rods with adjustable heights, and the lower ends of the telescopic rods are connected with rollers.
In some embodiments, the clamping portion is an arc-shaped plate, the circle center of the arc-shaped plate connected to the spherical hinge on the force transmission cylinder faces the engineering pile, and the circle center of the arc-shaped plate connected to the spherical hinge on the horizontal jack faces the foundation pile for horizontal load test detection.
Compared with the prior art, the invention has the following beneficial effects:
the method for detecting the horizontal load test of the foundation pile fully utilizes the engineering piles on site, and uses at least two engineering piles on site at the same time, so that a reaction wall is not required to be constructed, the engineering piles on site are not damaged, and the cost of the horizontal load test of the foundation pile is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of an embodiment of the present invention with a cross member connected to a force transfer cylinder;
FIG. 3 is a schematic structural view of an embodiment of the present invention with a cross member connected to a force transfer cylinder;
fig. 4 is a schematic structural view of another embodiment of a force transfer cylinder according to the invention;
FIG. 5 is a schematic structural diagram according to an embodiment of the present invention;
the labels in the figure are: 01. the foundation pile comprises a foundation pile body 02, an engineering pile body 1, a supporting portion 11, a cross beam 12, a sliding groove 13, a locking nut 14, a threaded hole 15, a screw rod 16, a telescopic rod 17, a roller 2, a force transmission cylinder 21, a first cylinder 22, an adjusting threaded hole 23, an adjusting screw rod 24, a fastening nut 25, a sliding groove 26, a sliding rod 3, a spherical hinge 4, an arc-shaped plate 41 and a locking screw rod.
Detailed Description
The present invention will be further described with reference to the following examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, other embodiments used by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; 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 in specific cases to those skilled in the art.
With reference to the attached drawing 1, the foundation pile horizontal load test detection method comprises a foundation pile horizontal load test detection device, the foundation pile horizontal load test detection device comprises a counterforce mechanism, the counterforce mechanism comprises a supporting part 1, the supporting part 1 is connected with at least two force transmission cylinders 2 with adjustable lengths, one end of each force transmission cylinder 2 is connected with the supporting part 1, the other end of each force transmission cylinder 2 is connected with a spherical hinge 3, and the spherical hinge 3 is connected with a clamping part which is used for being in contact with an engineering pile and abutting against the engineering pile 02.
In some embodiments, one side of the supporting portion 1 is connected with the force transmission cylinder 2, the other side of the supporting portion 1 is connected with the horizontal jack 5, one end of the horizontal jack 5 is connected with the supporting portion 1, the other end of the horizontal jack 5 is connected with the spherical hinge 3, and the spherical hinge 3 is connected with a clamping portion for clamping and abutting against the foundation pile 01 for horizontal load test detection.
In some embodiments, the clamping portion is an arc-shaped plate 4, the circle center of the arc-shaped plate 4 connected to the spherical hinge 3 on the force transmission cylinder 2 faces the engineering pile 02, and the circle center of the arc-shaped plate 4 connected to the spherical hinge 3 on the horizontal jack 5 faces the foundation pile 01 for horizontal load test detection. In some embodiments, the arc-shaped plate 4 is further provided with a locking screw 41, and the arc-shaped plate 4 is locked with the engineering pile 02 and the foundation pile 01 through the locking screw 41.
With reference to fig. 1, in some embodiments, the force transmission cylinder 2 includes a first cylinder 21, an adjustment threaded hole 22 is formed in the first cylinder 21 along a length direction of the first cylinder 21, an adjustment screw 23 is disposed in the adjustment threaded hole 22, one end of the adjustment screw 23 is inserted into the adjustment threaded hole 22, and the other end of the adjustment screw 23 is rotatably connected to the spherical hinge 3. Through the threaded connection of adjusting screw and first barrel to realize passing power section of thick bamboo length and adjusting. In some embodiments, the adjusting screw 23 is further provided with a fastening nut 24 penetrating the periphery of the first cylinder 21, so as to further lock the adjusting screw 23 and prevent loosening during test detection.
With reference to fig. 4, in some embodiments, the force transmission cylinder 2 includes a first cylinder 21, a sliding groove 25 is formed in the first cylinder 21 along a length direction of the first cylinder, a sliding rod 26 is disposed on the sliding groove 25, one end of the sliding rod 26 is matched with the sliding groove 25, and the other end of the sliding rod 26 is connected to the spherical hinge 3. That is to say, the force transmission cylinder 2 of the present application can also be adjusted in length in the form of a sliding groove 25 and a sliding rod 26, wherein a locking screw 41 and a locking nut for locking the sliding rod 26 in the sliding groove 25 are provided on the first cylinder 21 or the sliding rod 22.
In some embodiments the horizontal position of the force transfer cylinder 2 on the support 1 is adjustable.
Referring to fig. 2, in some embodiments, the support portion 1 includes a cross beam 11, a step-shaped sliding groove 12 is formed in the cross beam 11, one side of the first cylinder 21, which faces the cross beam 11, extends into the sliding groove 12 and is matched with the sliding groove 12, the first cylinder 21, which extends into the sliding groove 12, is further connected with a locking screw 41, the locking screw 41 penetrates out of the cross beam 11 and is provided with a locking nut 13, and the locking screw 41 and the locking nut 13 are matched with each other to lock the first cylinder 21 in the sliding groove of the cross beam. In order to facilitate the passing of the locking screw 41 and the sliding of the first cylinder 21 in the sliding groove 12, a strip-shaped through hole is formed in the position, corresponding to the locking screw 41, of the cross beam 11, and the locking screw 41 can penetrate out of the strip-shaped through hole to be fastened with the locking nut 13. So that the locking screw 41 can normally slide in the sliding groove 12 following the first cylinder 21 to adjust the position of the first cylinder 21 in the sliding groove 12, and the first cylinder 21 can be locked in the sliding groove 12 by the locking screw 41 and the locking nut 13 after the horizontal position of the first cylinder 21 is adjusted.
With reference to fig. 3, in some embodiments, the support portion 1 includes a cross beam 11, the cross beam 11 is further provided with a plurality of threaded holes 14, and the force transmission cylinder 2 (the first cylinder 21) is in threaded connection with the threaded holes 14 of the cross beam through screws 15 and is mounted on different threaded holes 14 to realize horizontal position adjustment of the force transmission cylinder 2 on the cross beam 11.
In some embodiments, the height positions of the horizontal jack, the support portion and the force transfer cylinder are adjustable.
Referring to fig. 5, in some embodiments, the lower end surfaces of the cross beam 11, the horizontal jack 5 and the force transmission cylinder 2 are connected with a telescopic rod 16 with adjustable height, and the lower end of the telescopic rod 16 is connected with a roller 17. Through telescopic link 16 and gyro wheel 17 even can be convenient for adjust the height, can enough be applicable to different detection scenes, also be convenient for carry equipment simultaneously.
The structure of the telescopic rod 16 belongs to the prior art, and can be understood and appreciated by those skilled in the art, and will not be described herein.
The detection method of the foundation pile horizontal load test detection device based on the above description comprises the following steps:
(1) selecting at least two engineering piles as stress action points of a horizontal load test according to the positions of foundation piles;
(2) adjusting the length of the force transmission cylinder, abutting a clamping part on the horizontal jack against a foundation pile for horizontal load test detection, and abutting a clamping part on the force transmission cylinder against an engineering pile;
(3) displacement sensors are arranged on a stressed horizontal plane of the foundation pile detected by a horizontal load test and a position 40-50cm above the horizontal plane;
(4) and starting the horizontal jack to perform horizontal load test detection on the foundation pile.
In some embodiments, a pressure sensor for detecting the pressure is further installed on the clamping portion interconnected with the horizontal jack 5.
The detection method of the invention fully utilizes the engineering piles on site, and uses at least two engineering piles on site simultaneously, thereby not needing construction counterforce wall, and not destroying the engineering piles and undisturbed soil on site, thereby reducing the cost of foundation pile horizontal load test and destroying the bearing capacity of undisturbed soil.
While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Those skilled in the art can make various changes, modifications and equivalent arrangements to those skilled in the art without departing from the spirit and scope of the present invention; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (9)
1. A foundation pile horizontal load test detection method is characterized by comprising a foundation pile horizontal load test detection device, wherein the foundation pile horizontal load test detection device comprises a counterforce mechanism, the counterforce mechanism comprises a supporting part, the supporting part is connected with at least two force transmission cylinders with adjustable lengths, one end of each force transmission cylinder is connected with the supporting part, the other end of each force transmission cylinder is connected with a spherical hinge, and the spherical hinge is connected with a clamping part which is used for being in contact with an engineering pile and abutting against the engineering pile; one side of the supporting part is connected with the force transmission cylinder, the other side of the supporting part is connected with a horizontal jack, one end of the horizontal jack is connected with the supporting part, the other end of the horizontal jack is connected with a spherical hinge, and a clamping part used for clamping and abutting against a foundation pile for horizontal load test detection is connected onto the spherical hinge; the method comprises the following steps:
(1) selecting at least two engineering piles as stress action points of a horizontal load test according to the positions of foundation piles;
(2) adjusting the length of the force transmission cylinder, abutting a clamping part on the horizontal jack against a foundation pile for horizontal load test detection, and abutting a clamping part on the force transmission cylinder against an engineering pile;
(3) displacement sensors are arranged on a stressed horizontal plane of the foundation pile detected by a horizontal load test and a position 40-50cm above the horizontal plane;
(4) and starting the horizontal jack to perform horizontal load test detection on the foundation pile.
2. The method for testing the horizontal load of the foundation pile according to claim 1, wherein a pressure sensor for detecting the magnitude of the pressure is further installed on the clamping portion connected to the horizontal jack.
3. The foundation pile horizontal load test detection method according to claim 1, wherein the force transmission cylinder comprises a first cylinder body, an adjusting threaded hole is formed in the first cylinder body along the length direction of the first cylinder body, an adjusting screw rod is arranged in the adjusting threaded hole, one end of the adjusting screw rod is inserted into the adjusting threaded hole, and the other end of the adjusting screw rod is rotatably connected with the spherical hinge.
4. The foundation pile horizontal load test detection method according to claim 1, wherein the force transmission cylinder comprises a first cylinder body, a sliding groove is formed in the first cylinder body along the length direction of the first cylinder body, a sliding rod is arranged on the sliding groove, one end of the sliding rod is matched with the sliding groove, and the other end of the sliding rod is connected with the spherical hinge.
5. The foundation pile horizontal load test detection method according to any one of claims 1 to 4, wherein the horizontal position of the force transmission cylinder on the support part is adjustable.
6. The foundation pile horizontal load test detection method according to claim 5, wherein the support part comprises a cross beam, a plurality of threaded holes are further formed in the cross beam, the force transmission cylinder is in threaded connection with the threaded holes in the cross beam through a screw rod, and the force transmission cylinder is installed in different threaded holes to achieve adjustment of the horizontal position of the force transmission cylinder on the cross beam; or a sliding groove is formed in the cross beam, one end of the force transmission cylinder is matched with the sliding groove and can slide in the sliding groove, and a locking screw and a locking nut used for locking the force transmission cylinder in the sliding groove are arranged on the force transmission cylinder or the cross beam in a matched mode.
7. The foundation pile horizontal load test detection method according to claim 1, wherein the height positions of the horizontal jack, the support part and the force transmission cylinder are adjustable.
8. The foundation pile horizontal load test detection method according to claim 7, wherein the lower end surfaces of the cross beam, the horizontal jack and the force transmission cylinder are connected with telescopic rods with adjustable heights, and the lower ends of the telescopic rods are connected with rollers.
9. The foundation pile horizontal load test detection method according to claim 2, wherein the clamping portion is an arc-shaped plate, the circle center of the arc-shaped plate connected to the spherical hinge on the force transmission cylinder faces the engineering pile, and the circle center of the arc-shaped plate connected to the spherical hinge on the horizontal jack faces the foundation pile for horizontal load test detection.
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| CN202110033619.2A CN112695816A (en) | 2021-01-12 | 2021-01-12 | Foundation pile horizontal load test detection method |
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| CN202110033619.2A CN112695816A (en) | 2021-01-12 | 2021-01-12 | Foundation pile horizontal load test detection method |
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Application publication date: 20210423 |