CN111962573A - Recoverable self-balancing method pile foundation bearing capacity detection device and construction method - Google Patents
Recoverable self-balancing method pile foundation bearing capacity detection device and construction method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E02D33/00—Testing foundations or foundation structures
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Abstract
A pile foundation bearing capacity detection device adopting a recoverable self-balancing method and a construction method belong to the technical field of geotechnical engineering tests. The detection device comprises a test pile, a loading system and a data acquisition system; the test pile consists of a solid pile, a hole digging pile and a steel plate; the loading system consists of a pressed rod, an expansion disc, a hydraulic jack, a pressurized oil pipe and a steel beam; the anchor bars connect the test pile and the loading system into a whole; the data acquisition system consists of a displacement sensor, a data memory, a data line and a computer; the displacement sensor connects the loading system with the data acquisition system, and forms an integral detection device with the test pile. The device is simple and strong in practicability, solves the problems that a plurality of anchor piles need to be arranged in an anchor pile method, the ground of a loading method is limited, and a load box cannot be recycled in a self-balancing test technology, can recycle the compression rod after the test is finished, can be used as an engineering pile after the test pile is grouted, is energy-saving and environment-friendly, and greatly reduces the test cost.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering tests, and particularly relates to a pile foundation bearing capacity detection device adopting a recoverable self-balancing method and a construction technology.
Background
In recent years, with the continuous development and progress of national economy and construction technology, many super high-rise buildings, large-span bridges and ocean tunnels emerge, the settlement of the foundation is increased by huge upper load, and the pile foundation as an engineering measure for improving the bearing capacity and reducing the settlement is widely applied under various unfavorable geological conditions such as seasonal frozen soil, collapsible loess, soft soil and the like, so that how to scientifically evaluate the bearing capacity of the foundation pile and select reasonable design parameters is particularly important. The traditional static load test of the pile foundation comprises a pile loading method and an anchor pile method, wherein the pile loading method mainly has the problems that the problems of source, storage, transportation and hoisting of hundreds of tons of piled loads and even thousands of tons of piled loads need to be solved, and the time and the labor are consumed; in the latter, a plurality of anchor piles and reaction girders are required to be arranged, so that the equipment is high in cost and is easily limited by site conditions and tonnage, the potential of the foundation pile cannot be fully exerted during testing, reliable data cannot be obtained, and the bearing capacity of the foundation pile cannot be scientifically and reasonably evaluated.
The novel testing technology such as the pile foundation self-balancing static load test is developed based on a counterforce system for improving the traditional static load test, is called as an O-Cell method, and is called as a self-balancing method in China; as a new pile foundation bearing capacity detection means, the technology is less limited by site conditions, so the method is particularly suitable for pile foundation bearing capacity detection tests of some special projects, such as deep foundation pit projects. However, the main defect of the testing technology is that the main equipment, namely the load box, is specially designed and can be used for loading, and the manufacturing cost is high; when in use, the steel bar cage is welded on the steel bar cage and can not be recovered after the test is finished.
Therefore, from various aspects of environmental protection, economical efficiency and the like, redesign and invention of the prior art and equipment are urgently needed.
Disclosure of Invention
The invention aims to provide a recoverable self-balancing pile foundation bearing capacity detection device and a construction method.
The invention relates to a recoverable self-balancing pile foundation bearing capacity detection device and a construction method, the recoverable self-balancing pile foundation bearing capacity detection device comprises a test pile body 1, a loading system 2 and a data acquisition system 3, wherein the test pile body 1 consists of a solid pile section B, a hole digging pile section A and a steel plate 4, a reserved hole 7 penetrating through a pile shaft is reserved in the hole digging pile section A along the axial lead, the shapes and the sizes of the solid pile section B, the outer section of the hole digging pile section A and the section of the steel plate 4 are consistent, the solid pile section B and the hole digging pile section A are both vertically arranged, the hole digging pile section A is arranged on the solid pile section B, the axial leads of the solid pile section B and the hole digging pile section A are coincident, and the steel plate 4 is horizontally arranged at the junction of the solid pile section B and; the loading system 2 comprises a compression rod 5, an expansion disc 8, a compression control box 9, a compression oil pipe 10, a hydraulic jack 11 and a steel beam 12, wherein the compression rod 5 is formed by connecting and splicing a combined steel column 17 with inverted convex threads at one end and concave threads at the other end, the cross-sectional area of the compression rod 5 is smaller than that of a reserved hole 7, the compression rod 5 is vertically inserted into the reserved hole 7 and placed on a steel plate 4, the cross-sectional shape of the expansion disc 8 is circular and placed at the top end of the compression rod 5, the cross-sectional area of the expansion disc 8 is larger than that of the compression rod 5, the hydraulic jack 11 is placed at the top of the expansion disc 8, the compression control box 9 is a rectangular cross-sectional device erected on the ground, an oil pipe joint is arranged on the side surface, the compression oil pipe 10 is connected to the oil pipe joint on the side surface of the compression control box 9, the compression control box 9 is connected, the center of the centroid of the lower flange of the steel beam 12 is in contact connection with the top end of the hydraulic jack 11, and the axial leads of the compression rod 5, the expansion disc 8, the hydraulic jack 11, the steel beam 12 and the steel plate 4 are superposed; the anchor bars 6 are high-strength steel bars and are arranged at the position, close to the edge of the section, of the bored pile section A, the upper ends of the anchor bars are welded on the two side faces of the steel beam 12 of the loading system 2, the lower ends of the anchor bars are bound on longitudinal stress main bars in the bored pile section A and are poured in the bored pile section A, and the test pile body 1 and the loading system 2 are connected together; the data acquisition system 3 consists of a displacement sensor 13, a data transmission line 15, a computer 14 and a data memory 16, wherein the data memory 16 is erected on the ground, data transmission interfaces are arranged on two sides of the data memory 16, a sounding end of the displacement sensor 13 is connected to the steel plate 4 and the inner side wall of the reserved hole 7, a data end is connected to a transmission interface on the side surface of the data memory 16, and the computer 14 and the data memory 16 are connected in series through the data transmission line 15; the loading system 2 is arranged on the test pile body 1 and connected together through the anchor bars 6, the data acquisition system 3 is erected on the ground and is connected with the test pile body 1 and the loading system 2 through the displacement sensor 13 to form a whole, and the recoverable self-balancing method pile foundation bearing capacity detection device is formed.
The invention discloses a construction method of a recoverable self-balancing pile foundation bearing capacity detection device, which comprises the following steps:
step (1), pouring a test pile body 1: taking a round-section pile as an example, according to related design requirements, manufacturing a reinforcement cage, placing concrete down to form a solid pile section B, placing a steel plate 4 at the junction of the solid pile section B and a bored pile section A, meanwhile, laying an anchor bar 6 at a position near the edge of the section of the solid pile section B, wherein the anchor bar 6 is higher than the ground by a preset height, the lower end of the anchor bar is bound on a longitudinal stress main bar of the bored pile section A, continuously pouring the bored pile section A upwards to the designed height, a reserved hole 7 is arranged at the centroid of the bored pile section A, and the centroids of the solid pile section B, the bored pile section A and the reserved hole 7 are kept on the same axis;
step (2), installing a loading system 2: after the concrete reaches the designed strength, assembling combined steel columns 17 with inverted convex threads at one end and concave threads at the other end to form a compression rod 5, vertically inserting the compression rod 5 into the reserved hole 7 to the steel plate 4, installing an expansion disc 8 at the top end of the compression rod 5, installing a hydraulic jack 11 at the top end of the expansion disc 8 in a contact manner, keeping the shape centers of the steel plate 4, the compression rod 5, the reserved hole 7, the expansion disc 8 and the compression jack 11 on the same axis, and connecting the hydraulic jack 11 and a compression control box 9 in series through a compression oil pipe 10;
step (3), connecting the test pile body 1 and the loading system 2: the lower ends of the anchor bars 6 are bound on longitudinal stressed main bars of the bored pile section A and are poured with the bored pile section A to form a whole, the upper ends of the anchor bars 6 are welded on two side faces of a steel beam 12 of the loading system 2, and the test pile body 1 and the loading system 2 are connected together;
step (4), installing a data acquisition system 3: a displacement sensor 13 is arranged on the inner walls of the steel plate 4 and the reserved hole 7 and is connected to a data memory 16 erected on the ground, and the data memory 16 and a computer 14 are connected in series by a data transmission line 15 to read displacement data;
after the installation is finished, debugging the loading system 2 and the data acquisition system 3;
after the test device is debugged, the hydraulic loading system 2 applies load, and the data acquisition system 3 measures displacement to draw a Q-S curve so as to obtain pile foundation bearing capacity data;
after the test in the step (7) is finished, hoisting equipment is used for hoisting the pressed rod 5 out of the reserved hole 7 for recycling; if the pile is an engineering pile, the reserved hole 7 is filled with concrete and tamped, and the anchor bar 6 can be continuously used as a bearing pile after being cut according to the designed height;
and (8) repeatedly testing the next pile according to the steps from the step (1) to the step (6) until the number of the tested piles meets the requirement.
The invention has the beneficial effects that: the invention provides a recoverable self-balancing method pile foundation bearing capacity detection device by adopting a mode of separating a pile body from a loading system, and the device has the main advantages that: (1) the device has small use space, and is particularly suitable for sloping fields, water, foundation pit bottoms and narrow fields; (2) the device uses the hydraulic jack to provide load, has low cost and short test period, greatly reduces the engineering quantity and is beneficial to increasing the number of test piles; (3) after the test is finished, hoisting equipment is used for hoisting the combined steel column out for recycling, so that a large amount of resources are saved; (4) the pile can be used as a bearing pile after grouting of the reserved hole of the test pile, and the economic benefit is remarkable.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention; FIG. 2 is a schematic view of a standard section of a prefabricated steel column of a composite steel column 5, wherein sections are connected by screwing male threads into female threads; FIG. 3 is a schematic view of the welding of anchor bars and steel beams.
Reference numerals and corresponding names: the device comprises a test pile body 1, a loading system 2, a data acquisition system 3, a solid pile section B, a hole digging pile section A at the centroid, a steel plate 4, a compression rod 5, an anchor bar 6, a reserved hole 7, an expansion disc 8, a pressurization control box 9, a pressurization oil pipe 10, a hydraulic jack 11, a steel beam 12, a displacement sensor 13, a computer 14, a data transmission line 15, a data memory 16 and a combined steel column 17.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and specific examples, which are given by way of illustration and not by way of limitation. All changes, equivalents and modifications that come within the spirit of the invention are desired to be protected.
As shown in fig. 1, 2 and 3, the invention relates to a recoverable self-balancing method pile foundation bearing capacity detection device and a construction method thereof, and the structure of the device comprises: the test pile body 1, the loading system 2 and the data acquisition system 3; the test pile body 1 consists of a solid pile section B, a hole digging pile section A and a steel plate 4, a reserved hole 7 penetrating through a pile shaft is reserved in the hole digging pile section A along the axial lead, the outer sections of the solid pile section B and the hole digging pile section A are consistent with the section shape and size of the steel plate 4, the solid pile section B and the hole digging pile section A are both vertically placed, the hole digging pile section A is placed on the solid pile section B, the axial leads of the solid pile section B and the hole digging pile section A are coincident, and the steel plate 4 is horizontally placed at the junction of the solid pile section B and the hole digging pile section A; the loading system 2 comprises a compression rod 5, an expansion disc 8, a compression control box 9, a compression oil pipe 10, a hydraulic jack 11 and a steel beam 12, wherein the compression rod 5 is formed by connecting and splicing a combined steel column 17 with inverted convex threads at one end and concave threads at the other end, the cross-sectional area of the compression rod 5 is smaller than that of a reserved hole 7, the compression rod 5 is vertically inserted into the reserved hole 7 and placed on a steel plate 4, the cross-sectional shape of the expansion disc 8 is circular and placed at the top end of the compression rod 5, the cross-sectional area of the expansion disc 8 is larger than that of the compression rod 5, the hydraulic jack 11 is placed at the top of the expansion disc 8, the compression control box 9 is a rectangular cross-sectional device erected on the ground, an oil pipe joint is arranged on the side surface, the compression oil pipe 10 is connected to the oil pipe joint on the side surface of the compression control box 9, the compression control box 9 is connected, the center of the centroid of the lower flange of the steel beam 12 is in contact connection with the top end of the hydraulic jack 11, and the axial leads of the compression rod 5, the expansion disc 8, the hydraulic jack 11, the steel beam 12 and the steel plate 4 are superposed; the anchor bars 6 are high-strength steel bars and are arranged at the position, close to the edge of the section, of the bored pile section A, the upper ends of the anchor bars are welded on the two side faces of the steel beam 12 of the loading system 2, the lower ends of the anchor bars are bound on longitudinal stress main bars in the bored pile section A and are poured in the bored pile section A, and the test pile body 1 and the loading system 2 are connected together; the data acquisition system 3 consists of a displacement sensor 13, a data transmission line 15, a computer 14 and a data memory 16, wherein the data memory 16 is erected on the ground, data transmission interfaces are arranged on two sides of the data memory 16, a sounding end of the displacement sensor 13 is connected to the steel plate 4 and the inner side wall of the reserved hole 7, a data end is connected to a transmission interface on the side surface of the data memory 16, and the computer 14 and the data memory 16 are connected in series through the data transmission line 15; the loading system 2 is arranged on the test pile body 1 and connected together through the anchor bars 6, the data acquisition system 3 is erected on the ground and is connected with the test pile body 1 and the loading system 2 through the displacement sensor 13 to form a whole, and the recoverable self-balancing method pile foundation bearing capacity detection device is formed.
As shown in fig. 1, the test pile body 1 is composed of a bored pile section a, a solid pile section B and a steel plate 4 at the junction; the solid pile section B is a solid pile body, and the reinforcement is normally arranged according to the design drawing; the hole digging pile section A is a pile body which is provided with a hole 7 at the section centroid and is additionally provided with anchor bars 6; the section shape and the section area of the steel plate 4 are consistent with those of the hole digging pile section A and the solid pile section B, the position of the steel plate is at the boundary of the hole digging pile section A and the solid pile section B, and the thickness of the steel plate is 0.08-0.10 m; the section of the reserved hole 7 is circular, and the diameter is 0.3-0.5 m; the pressure rod 5 is 0.5-0.8 m higher than the pile top, the cross section shape is a circular cross section as an example, and the diameter is 0.1-0.3 m; the expanding disc 8 is a circular section, the thickness is 0.08-0.10 m, and the diameter of the section is 0.08-0.10 m larger than that of the sectional combined steel column 5; the computer 14 is internally provided with a control algorithm and driving software of data acquisition and deformation testing software.
As shown in fig. 1 and 2, each section of the composite steel column 17 is 5m long, one end of the composite steel column is provided with inverted convex threads, the other end of the composite steel column is provided with concave threads, the diameter of the composite steel column is 5-10 cm smaller than that of the core hole digging pile section a, and the specific design length is arranged according to the pile length.
As shown in fig. 1 and 3, the steel beam 12 is a common hot rolled i-steel with a model number of 20# a and a size of 200 x 100 x 7.0 mm; the anchor bars 6 are high-strength threaded steel bars with HRB400 and the diameter of 32mm, are 1.0-1.2 m higher than the top surface of the section A, and are welded on two side edges of the steel beam 12.
As shown in fig. 1, the implementation method of the recoverable pile foundation static load testing device based on the self-balancing technology of the invention comprises the following steps:
step (1), pouring a test pile body 1: taking a round-section pile as an example, according to related design requirements, manufacturing a reinforcement cage, placing concrete down to form a solid pile section B, placing a steel plate 4 at the junction of the solid pile section B and a bored pile section A, meanwhile, laying an anchor bar 6 at the position near the edge of the section of the solid pile section B, wherein the anchor bar 6 is higher than the ground by a certain height, the lower end of the anchor bar is bound on a longitudinal stress main bar of the bored pile section A, continuously pouring the bored pile section A upwards to the designed height, a reserved hole 7 is arranged at the centroid of the bored pile section A, and the centroids of the solid pile section B, the bored pile section A and the reserved hole 7 are kept on the same axis;
step (2), installing a loading system 2: after the concrete reaches the designed strength, assembling combined steel columns 17 with inverted convex threads at one end and concave threads at the other end to form a compression rod 5, vertically inserting the compression rod 5 into the reserved hole 7 to the steel plate 4, installing an expansion disc 8 at the top end of the compression rod 5, installing a hydraulic jack 11 at the top end of the expansion disc 8 in a contact manner, keeping the shape centers of the steel plate 4, the compression rod 5, the reserved hole 7, the expansion disc 8 and the compression jack 11 on the same axis, and connecting the hydraulic jack 11 and a compression control box 9 in series through a compression oil pipe 10;
step (3), connecting the test pile body 1 and the loading system 2: the lower ends of the anchor bars 6 are bound on longitudinal stressed main bars of the bored pile section A and are poured with the bored pile section A to form a whole, the upper ends of the anchor bars 6 are welded on two side faces of a steel beam 12 of the loading system 2, and the test pile body 1 and the loading system 2 are connected together;
step (4), installing a data acquisition system 3: a displacement sensor 13 is arranged on the inner walls of the steel plate 4 and the reserved hole 7 and is connected to a data memory 16 erected on the ground, and the data memory 16 and a computer 14 are connected in series by a data transmission line 15 to read displacement data;
after the installation is finished, debugging the loading system 2 and the data acquisition system 3;
after the test device is debugged, the hydraulic loading system 2 applies load, and the data acquisition system 3 measures displacement to draw a Q-S curve so as to obtain pile foundation bearing capacity data;
after the test in the step (7) is finished, hoisting equipment is used for hoisting the pressed rod 5 out of the reserved hole 7 for recycling; if the pile is an engineering pile, the reserved hole 7 is filled with concrete and tamped, and the anchor bar 6 can be continuously used as a bearing pile after being cut according to the designed height;
and (8) repeatedly testing the next pile according to the steps from the step (1) to the step (6) until the number of the tested piles meets the requirement.
The main principle of the invention is as follows: (1) principle of acting force and reacting force: the steel plate is arranged at the junction of the solid pile and the dug pile, the pile body is divided into an upper part and a lower part, the anchor bars are pulled upwards when the hydraulic jack is loaded, and meanwhile, the steel plate is pressed downwards through the pressed rods inserted into the reserved holes. (2) The detection principle is as follows: under the principle of acting force and reacting force, the hydraulic jack enables the solid pile to generate downward displacement through the pressing of the pressed rod and the steel plate, the hole digging pile generates upward displacement due to the reacting force system formed by the anchor bars and the steel beam, a corresponding Q-S curve is drawn, and the bearing capacity of the pile foundation is judged. (3) The recovery principle is as follows: and after the measurement is finished, removing the steel beam, the hydraulic jack and the expansion disc, cutting the anchor bars according to the designed height, lifting and recovering the pressed rod from the reserved hole of the bored pile in a segmented manner by using hoisting equipment, removing all components for re-assembly and utilization, and filling concrete in the reserved hole of the upper end pile body and tamping the concrete to be filled to be used as a bearing pile.
Claims (4)
1. A recoverable self-balancing pile foundation bearing capacity detection device comprises a test pile body (1), a loading system (2) and a data acquisition system (3), and is characterized in that the test pile body (1) consists of a solid pile section (B), a hole digging pile section (A) and a steel plate (4), a reserved hole (7) penetrating through a pile shaft is reserved in the hole digging pile section (A) along the axial lead, the outer cross section of the solid pile section (B) and the hole digging pile section (A) is consistent with the cross section of the steel plate (4) in shape and size, the solid pile section (B) and the hole digging pile section (A) are both vertically placed, the hole digging pile section (A) is placed on the solid pile section (B) and the axial leads of the solid pile section (B) and the solid pile section (B) coincide with each other, and the steel plate (4) is horizontally placed at the junction of the solid pile section (B) and; the loading system (2) is composed of a compression rod (5), an expansion disc (8), a compression control box (9), a compression oil pipe (10), a hydraulic jack (11) and a steel beam (12), wherein the compression rod (5) is formed by connecting and splicing a combined steel column (17) with an inverted-convex-shaped thread at one end and a concave-shaped thread at the other end, the cross-sectional area of the compression rod (5) is smaller than that of a reserved hole (7), the compression rod (5) is vertically inserted into the reserved hole (7) and placed on a steel plate (4), the cross-sectional shape of the expansion disc (8) is circular and placed at the top end of the compression rod (5), the cross-sectional area of the expansion disc (8) is larger than that of the compression rod (5), the hydraulic jack (11) is placed at the top of the expansion disc (8), the compression control box (9) is a rectangular cross-section device erected on the ground, and the side surface is provided, the pressurizing oil pipe (10) is connected to an oil pipe joint on the side surface of the pressurizing control box (9), the pressurizing control box (9) is connected to the hydraulic jack (11) through the pressurizing oil pipe (10), the center of the centroid of the lower flange of the steel beam (12) is in contact connection with the top end of the hydraulic jack (11), and the axial leads of the compression rod (5), the expansion disc (8), the hydraulic jack (11), the steel beam (12) and the steel plate (4) are superposed; the anchor bars (6) are high-strength steel bars and are arranged at the position, close to the edge of the section, of the bored pile section (A), the upper ends of the anchor bars are welded on the two side faces of a steel beam (12) of the loading system (2), the lower ends of the anchor bars are bound on longitudinal stress main bars in the bored pile section (A) and poured in the bored pile section (A), and the test pile body (1) and the loading system (2) are connected together; the data acquisition system (3) is composed of a displacement sensor (13), a data transmission line (15), a computer (14) and a data storage device (16), the data storage device (16) is erected on the ground, data transmission interfaces are arranged on two sides of the data storage device, a sounding end of the displacement sensor (13) is connected to the steel plate (4) and the inner side wall of the reserved hole (7), a data end is connected to the transmission interface on the side face of the data storage device (16), and the computer (14) and the data storage device (16) are connected in series through the data transmission line (15); the loading system (2) is arranged on the test pile body (1) and connected together through anchor bars (6), the data acquisition system (3) is erected on the ground and is connected with the test pile body (1) and the loading system (2) through the displacement sensor (13) to form a whole, and the recoverable self-balancing method pile foundation bearing capacity detection device is formed.
2. The recoverable self-balancing pile foundation bearing capacity detection device of claim 1, wherein: the centroid of the section of the compression rod (5) and the reserved hole (7) are on the same axis and are inserted into the steel plate (4) along the reserved hole (7).
3. The recoverable self-balancing pile foundation bearing capacity detection device of claim 1, wherein: and longitudinal stress main ribs are arranged in the digging pile section (A) and the solid pile section (B).
4. The construction method of the recoverable self-balancing pile foundation bearing capacity detection device according to claim 1, characterized by comprising the following steps:
pouring a test pile body (1): taking a round-section pile as an example, according to related design requirements, manufacturing a reinforcement cage, placing concrete to form a solid pile section (B), placing a steel plate (4) at the junction of the solid pile section (B) and a bored pile section (A), laying an anchor bar (6) at the position near the edge of the section of the solid pile section (B), wherein the anchor bar (6) is higher than the ground by a preset height, the lower end of the anchor bar is bound on a longitudinal stress main bar of the bored pile section (A), continuously casting the bored pile section (A) upwards to the designed height, a reserved hole (7) is arranged at the centroid of the bored pile section (A), and the centroids of the solid pile section (B), the bored pile section (A) and the reserved hole (7) are kept on the same axis;
step (2), installing a loading system (2): after the concrete reaches the designed strength, assembling combined steel columns (17) with inverted convex threads at one end and concave threads at the other end, connecting the combined steel columns end to form a compression rod (5), vertically inserting the compression rod into the reserved hole (7) until the steel plate (4), installing an expansion disc (8) at the top end of the compression rod (5), installing a hydraulic jack (11) at the top end of the expansion disc (8) in a contact manner, keeping the centroids of the steel plate (4), the compression rod (5), the reserved hole (7), the expansion disc (8) and the compression jack (11) on the same axis, and connecting the hydraulic jack (11) and a compression control box (9) in series through a compression oil pipe (10);
step (3), connecting the test pile body (1) and the loading system (2): the lower ends of the anchor bars (6) are bound on longitudinal stress main bars of the bored pile section (A) and are poured with the bored pile section (A) to form a whole, the upper ends of the anchor bars (6) are welded on two side faces of a steel beam (12) of the loading system (2), and the test pile body (1) and the loading system (2) are connected together;
and (4) installing a data acquisition system (3): displacement sensors (13) are arranged on the inner walls of the steel plate (4) and the reserved hole (7) and are connected into a data memory (16) erected on the ground, and the data memory (16) is connected with a computer (14) in series through a data transmission line (15) to read displacement data;
after the installation is finished, debugging the loading system (2) and the data acquisition system (3);
after the test device is debugged, the hydraulic loading system (2) applies load, and the data acquisition system (3) measures displacement and draws a Q-S curve to obtain pile foundation bearing capacity data;
after the test in the step (7) is finished, hoisting equipment is used for hoisting the pressed rod (5) out of the reserved hole (7) for recycling; if the pile is an engineering pile, the reserved hole (7) is filled with concrete and tamped, and the anchor bar (6) is cut according to the designed height and then can be continuously used as a bearing pile;
and (8) repeatedly testing the next pile according to the steps from the step (1) to the step (6) until the number of the tested piles meets the requirement.
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Effective date of registration: 20221128 Address after: 730030 Lanzhou New Area, Gansu Province, north of Jialingjiang Street, south of Changjiang Avenue, east of Kunlun Mountain Avenue, west of Huashan Road Patentee after: Lanzhou University of Technology Engineering Testing Technology Co.,Ltd. Address before: 730050, No. 287 Lan Ping Road, Qilihe District, Gansu, Lanzhou Patentee before: LANZHOU University OF TECHNOLOGY |