CN111289351A - Composite light pile group pile bearing capacity detection device, system and method - Google Patents
Composite light pile group pile bearing capacity detection device, system and method Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention discloses a composite light pile group pile bearing capacity detection device, a system and a method. The connecting reinforcing steel bar can improve the integrity of the composite light pile and the light subbase layer, the bearing platform can transmit the acting force of the loading device for simulating the real load of the roadbed to the light subbase layer, the detection system comprises the detection device and the composite light pile group pile, the detection requirement of the bearing capacity of the composite light pile group pile can be met, the detection system can also be used for researching the stress characteristic and the deformation control effect, the light subbase layer can better simulate the actual engineering condition and meet the engineering detection requirement.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a device, a system and a method for detecting pile bearing capacity of a composite light pile group.
Background
In recent years, as the construction of engineering and construction has rapidly progressed, the relationship between new buildings and existing buildings has become intricate. Under the action of additional load of a newly built (constructed) building, the existing building (constructed) may have diseases such as uneven settlement, inclination instability, fracturing and crushing, and even serious safety accidents are caused.
In order to avoid additional stress formed by a newly built (constructed) building on the base of an existing building (constructed) and influence the normal use function of the existing building (constructed) and solve the adverse effect of a newly built roadbed on an adjacent ballastless roadbed and an operation tunnel by utilizing a composite light pile to perform foundation equal-load replacement, however, the bearing capacity of the composite light pile in the actual use process is not clear, the bearing capacity of the composite light pile in the prior art is not detected, so that more problems are encountered in the actual use process, and the use is inconvenient.
Disclosure of Invention
The invention aims to: aiming at the problem that the bearing capacity of the composite light pile is not detected in the prior art, the device, the system and the method for detecting the bearing capacity of the composite light pile group pile are provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
the composite light pile group pile bearing capacity detection device comprises a supporting subsystem, a loading subsystem and a testing subsystem, and is used for detecting the composite light pile group pile;
the supporting subsystem comprises connecting steel bars, a light subbase layer and a bearing platform, wherein one end of each connecting steel bar is anchored into the composite light pile, and the other end of each connecting steel bar is fixedly connected with the light subbase layer;
the loading subsystem comprises a loading device, a pressure sensor, a main beam and a counterforce device, wherein the loading device is arranged in the center of the pile top of the composite light pile, the pressure sensor is positioned at the upper end of the loading device, two ends of the counterforce device are connected with a foundation, the counterforce device is positioned at the upper end of the pressure sensor, and the main beam is positioned between the counterforce device and the pressure sensor;
the testing subsystem comprises a dial indicator, a horizontal grid tension sensor, a load sensor, a soil pressure box and a composite reinforcement cage dynamometer, wherein the dial indicator is installed on a bearing platform, the horizontal grid tension sensor is installed in a horizontal geogrid, the load sensor is installed at the pile top of the composite light pile, and the soil pressure box is installed in the soil between the adjacent composite light piles.
Through the structure, the connecting reinforcement can improve the wholeness of compound light pile and light subbase, loading device's the position that sets up can avoid causing the eccentric force when loading device loads, the displacement of cushion cap can be measured to the percentage table, counterforce device can simulate the road bed true load, the cushion cap can transmit the loading device effort of simulating the road bed true load to the light subbase, the detection requirement of compound light pile crowd pile bearing capacity can be satisfied to the compound light pile crowd pile bearing capacity detecting system who provides, still can be used to research compound light pile crowd pile atress characteristic and deformation control effect, through setting up the simulation actual engineering condition that the light subbase can be better, satisfy the engineering and detect the requirement.
As a preferable scheme of the present invention, the light subbase includes a reinforcing mesh, light soil and horizontal geogrids, the reinforcing mesh is disposed at the bottom of the light subbase and is fixedly connected with the connecting reinforcement, and the horizontal geogrids are disposed at intervals along the height direction of the light subbase. Through the structure, the light subbase layer can simulate the placement of light soil in actual engineering, avoid the rigid and semi-rigid contact between the bearing platform and the composite light pile, and better simulate the actual working condition on site.
In a preferred embodiment of the present invention, the reaction device comprises an anchor pile beam reaction device, a ballast platform reaction device or an anchor pile ballast combination reaction device, and the loading device comprises a jack.
As a preferable scheme of the invention, the supporting subsystem further comprises a coarse sand cushion layer, the coarse sand cushion layer is positioned at the bottom of the light bottom base layer, and the thickness of the coarse sand cushion layer is not less than 0.2 m. Through above-mentioned structure, can prevent that vertical load from passing through light subbase and transmitting to the soil between the stake, lead to detecting system to be difficult to the actual bearing capacity of effective survey composite light pile crowd's stake.
The composite light pile group pile bearing capacity detection system comprises the detection device and a composite light pile group pile, wherein the composite light pile group pile comprises a plurality of composite light piles;
the composite light pile comprises pile-forming light soil and a composite reinforcement cage, wherein the composite reinforcement cage comprises vertical geogrids arranged at intervals along the circumferential direction and annular geogrids arranged at intervals along the vertical direction.
According to the preferable scheme, the composite reinforcement cage dynamometer comprises four annular grid tension sensors and four vertical grid tension sensors, the annular grid tension sensors are mounted on the annular geogrids, and the vertical grid tension sensors are mounted on the vertical geogrids.
The method for detecting the pile bearing capacity of the composite light pile group comprises the following steps:
s1, installing an annular grating tension sensor and a vertical grating tension sensor on the composite reinforcement cage sent to a detection site;
s2: excavating light subbase foundation soil, constructing foundation drilling holes, and removing residues at the bottoms of the holes;
s3: sending the composite reinforcement cage into a foundation for drilling;
s4: injecting light soil into the foundation drill hole until the light soil is filled in the foundation drill hole, and embedding connecting steel bars at the pile top;
s5: excavating soil between piles, installing a soil pressure box, and paving a medium-coarse sand layer;
s6: installing a load sensor on the pile top, laying a reinforcing mesh and fixing the reinforcing mesh with connecting reinforcing steel bars, pouring light soil in layers, laying a horizontal geogrid in layers and installing a horizontal grid tension sensor;
s7, pouring a bearing platform;
s8: sequentially mounting a jack, a pressure sensor, a main beam and a counter-force device on a bearing platform, and simultaneously mounting a reference beam and a dial indicator;
s9: gradually applying load until the maximum design load capacity is reached, reading test data of the test subsystem, and sorting and analyzing the test data;
s10: and (5) unloading the load in a grading manner.
Through the structure, the detection method has the characteristics of novel system, easiness in implementation, simplicity in operation, investment saving and the like, the flow of the detection method is clear, the detection result can meet the requirements of engineering and scientific research, and the method has wide popularization and application prospects and is remarkable in society and economy.
In a preferred embodiment of the present invention, in step S9, the increment of the load of each stage is not greater than 50KPa, and the next stage of load is applied after the load of each stage is stabilized.
In a preferable scheme of the invention, in the step S10, the unloading amount of each stage of load is not more than 100KPa, and the next stage of load is unloaded after each stage of load is unloaded to be stable.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the connecting steel bar can improve the integrity of the composite light pile and the light subbase, the arrangement position of the loading device can avoid eccentric force caused by loading of the loading device, the dial indicator can measure the displacement of the bearing platform, the counterforce device can simulate the real load of the roadbed, the bearing platform can transmit the acting force of the loading device simulating the real load of the roadbed to the light subbase, the provided composite light pile group pile bearing capacity detection system can meet the detection requirement of the composite light pile group pile bearing capacity, the composite light pile group pile bearing capacity detection system can also be used for researching the stress characteristic and the deformation control effect of the composite light pile group pile, and the engineering detection requirement can be met by setting the light subbase to better simulate the actual engineering condition.
Drawings
Fig. 1 is a schematic cross-sectional view of a composite light pile group pile bearing capacity detection system according to the invention.
FIG. 2 is a schematic view of the support subsystem of the present invention.
FIG. 3 is a schematic diagram of a loading subsystem according to the present invention.
FIG. 4 is a schematic diagram of a support subsystem test instrument arrangement according to the present invention.
FIG. 5 is a schematic diagram of the arrangement of a composite reinforcement cage dynamometer according to the invention.
Fig. 6 is a schematic plan view of the annular grill tension sensor according to the present invention.
Fig. 7 is a schematic plan view of a vertical grid tension sensor according to the present invention.
Fig. 8 is a schematic view of the connection mode of the composite reinforcement cage and the outlet of the pumping pipe in the composite light-weight pile structure.
Icon: 1-pile group of composite light piles; 4-a support subsystem; 3-a loading subsystem; 2-a test subsystem; 41-coarse sand cushion layer; 42-connecting reinforcing steel bars; 43-light sub-base layer; 431-a mesh reinforcement; 432-light soil; 433-horizontal geogrid; 44-a platform; 31-a jack; 32-a pressure sensor; 33-main beam; 34-a counterforce device; 20-a reference beam; 21-dial indicator; 22-horizontal grid tension sensor; 23-a load sensor; 24-a soil pressure cell; 25-an annular grid tension sensor; 26-a vertical grid tension sensor; 11-an annular geogrid; 12-vertical geogrids; 7-a composite reinforcement cage; 5, pumping a pipe; 6-annular lock catch and D-foundation.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Referring to fig. 1, the composite light pile group pile bearing capacity detection system comprises a detection device and a composite light pile group pile 1, wherein the detection device comprises a supporting subsystem 4, a loading subsystem 3 and a testing subsystem 2, the supporting subsystem 4 is composed of a coarse sand cushion 41, a connecting steel bar 42, a light sub-base 43 and a bearing platform 44, the loading subsystem 3 is composed of a jack 31, a pressure sensor 32, a main beam 33 and a counterforce device 34, and the testing subsystem 2 comprises a dial indicator 21, a horizontal grid tension sensor 22, a load sensor 23, a soil pressure box 24 and a composite reinforcement cage 7 dynamometer.
In the scheme, the method comprises the following steps:
referring to fig. 1 and 2, the thickness of the coarse sand cushion 41 in the support subsystem 4 is not less than 0.2m, and the coarse sand cushion has the function of preventing vertical load from being transferred to the inter-pile soil through the light sub-base 43, so that it is difficult for the detection system to effectively determine the actual bearing capacity of the composite light pile group pile 1. One end of a connecting steel bar 42 in the support subsystem 4 is anchored into the composite light pile, and the other end is fixedly connected with the light subbase 43; which serves to improve the integrity of the composite light pile with the light sub-base layer 43. The light subbase layer 43 in the support subsystem 4 consists of a steel mesh 431, light soil 432 and horizontal geogrids 433, wherein the steel mesh 431 is arranged at the bottom of the light subbase layer 43 and is fixedly connected with the connecting steel bars 42, and 1 horizontal geogrid 433 is arranged along the height direction of the light subbase layer 43 at intervals of not less than 0.6m in a pull-through manner; the light subbase 43 is used for simulating the light soil placement of the actual engineering, so that the rigid and semi-rigid contact between the bearing platform 44 and the composite light pile is avoided, and the actual working condition of the site is better simulated. The bearing platform 44 in the support subsystem 4 is poured by 240 reinforced concrete, the thickness of the bearing platform 44 is not less than 0.4m, the bearing platform 44 is poured according to a square shape when the grouped piles are square pile arrangement, and the bearing platform 44 is poured according to a round shape when the grouped piles are quincunx pile arrangement; the purpose of the platform 44 is to transfer the jack 31 forces simulating the load of the subgrade to the light sub-base 43.
Referring to fig. 1 and 3, the jack 31 in the loading subsystem 3 is mounted on the center of the composite lightweight pile top, and the function of the jack 31 is to avoid eccentric force caused by loading. The counterforce 34 in the loading subsystem 3 is an anchor pile beam counterforce or a ballast platform counterforce or an anchor pile ballast combined counterforce.
Referring to fig. 1 and 4, in the testing subsystem 2, a dial indicator 21 is installed on a bearing platform 44, a horizontal grid tension sensor 22 is installed in a horizontal geogrid 433 of a light sub-base layer 43, a load sensor 23 is installed on the pile top of a composite light pile, and a soil pressure box 24 is installed on the soil between adjacent composite light piles; the 1 group of composite reinforcement cage 7 dynamometer in the test subsystem 2 comprises 4 annular grille tension sensors 25 and 4 vertical grille tension sensors 26 which are respectively installed on an annular geogrid 11 and a vertical geogrid 12 of the composite reinforcement cage 7, the geogrids are oppositely arranged in four equal parts on the horizontal plane, and 1 group of composite reinforcement cage 7 dynamometers are arranged at intervals of not less than 2m along the pile depth.
Referring to fig. 1 to 8, another technical problem to be solved by the present invention is to provide a detection method of the composite lightweight pile group pile bearing capacity detection system, the method includes the following steps:
s1: processing the geogrid into a composite reinforcement cage 7 and conveying the composite reinforcement cage to a construction site, and installing an annular grid tension sensor 25 and a vertical grid tension sensor 26 on the composite reinforcement cage 7;
s2: excavating light subbase layer 43 foundation soil, constructing foundation D drill holes, and removing residues at the bottoms of the holes;
s3: sleeving the upper end of the composite reinforcement cage 7 into the outer wall of the outlet end of the pumping pipe 5, locking the composite reinforcement cage by using an annular lock catch 6, and feeding the composite reinforcement cage 7 into a drill hole;
s4: slowly injecting light soil into the drill hole through the pumping pipe T until the drill hole is filled with the light soil, then loosening the annular lock catch 6, drawing out the pumping pipe 5, and embedding a connecting steel bar 42 in the pile top;
s5: when the composite light pile reaches 80% of the designed strength grade, excavating soil between piles, installing a soil pressure box 24, and paving a medium-coarse sand layer;
s6: installing a load sensor 23 on the pile top, laying a reinforcing mesh 431 and fixing the reinforcing mesh with connecting steel bars 42, pouring light soil 432 in a layered mode, laying a horizontal geogrid 433 in a layered mode and installing a horizontal grid tension sensor 22;
s7: when the light subbase 43 reaches 90% of the designed strength grade, pouring 240 reinforced concrete into the bearing platform 44;
s8: after the bearing platform 44 reaches the design strength, sequentially installing the jack 31, the pressure sensor 32, the main beam 33 and the counterforce device 34 on the bearing platform 44, and installing the reference beam 20 and the dial indicator 21;
s9: gradually applying load through the jack 31 until the maximum design load capacity is reached, reading the test data of the test subsystem 2, and sorting and analyzing the test data;
s10: the load is unloaded in stages by the jacks 31.
In the scheme, the method comprises the following steps:
in step S9, the increment of each level of load is not greater than 50KPa, and the next level of load is applied after the load of each level of load is stabilized.
In step S10, the unloading amount of each stage of load is not greater than 100KPa, and the next stage of load is unloaded after each stage of load is unloaded to be stable.
The system and the method for detecting the pile bearing capacity of the composite light pile group have the characteristics of novel system, easiness in implementation, simplicity in operation, investment saving and the like, the detection method is clear in flow, the detection result can meet the requirements of engineering and scientific research, and the system and the method have wide popularization and application prospects and are remarkable in society and economy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The device for detecting the bearing capacity of the composite light pile group pile is characterized by comprising a supporting subsystem (4), a loading subsystem (3) and a testing subsystem (2), wherein the detecting device is used for detecting the composite light pile group pile (1);
the supporting subsystem (4) comprises connecting steel bars (42), a light base layer (43) and a bearing platform (44), one end of each connecting steel bar (42) is anchored into the composite light pile, and the other end of each connecting steel bar (42) is fixedly connected with the light base layer (43);
the loading subsystem (3) comprises a loading device, a pressure sensor (32), a main beam (33) and a counterforce device (34), the loading device is arranged in the center of the pile top of the composite light pile, the pressure sensor (32) is positioned at the upper end of the loading device, the counterforce device (34) is positioned at the upper end of the pressure sensor (32), two ends of the counterforce device (34) are connected with a foundation (D), and the main beam (33) is positioned between the counterforce device (34) and the pressure sensor (32);
the testing subsystem (2) comprises a dial indicator (21), a horizontal grid tension sensor (22), a load sensor (23), a soil pressure cell (24) and a composite reinforcement cage (7) dynamometer, wherein the dial indicator (21) is installed on a bearing platform (44), the horizontal grid tension sensor (22) is installed in a horizontal geogrid (433), the load sensor (23) is installed at the pile top of the composite light pile, and the soil pressure cell (24) is installed in the soil between the piles of the adjacent composite light piles.
2. The composite light pile group pile load-carrying capacity detection device according to claim 1, wherein the light base layer (43) comprises a steel mesh (431), light soil (432) and horizontal geogrids (433), the steel mesh (431) is arranged at the bottom of the light base layer (43) and fixedly connected with the connecting steel bars (42), and the horizontal geogrids (433) are arranged at intervals along the height direction of the light base layer (43).
3. The composite lightweight pile group pile carrying capacity detection device as recited in claim 1, wherein the reaction device (34) comprises an anchor pile beam reaction device, a ballast platform reaction device or an anchor pile ballast combination reaction device, and the loading device comprises a jack (31).
4. The composite light pile group pile carrying capacity detection device according to claim 1, wherein the support subsystem (4) further comprises a coarse sand cushion layer (41), the coarse sand cushion layer (41) is located at the bottom of the light bottom base layer (43), and the thickness of the coarse sand cushion layer (41) is not less than 0.2 m.
5. Composite light pile group pile bearing capacity detection system, characterized in that, comprising the detection device of the above claims 1-4, further comprising a composite light pile group pile (1), wherein the composite light pile group pile (1) comprises a plurality of composite light piles;
the composite light pile comprises pile-forming light soil and a composite reinforcement cage (7), wherein the composite reinforcement cage (7) comprises vertical geogrids (12) arranged at intervals along the circumferential direction and annular geogrids (11) arranged at intervals along the vertical direction.
6. The composite lightweight pile group pile load-bearing capacity detection system according to claim 5, wherein the set of composite reinforcement cage (7) dynamometer comprises four annular grid tension sensors (25) and four vertical grid tension sensors (26), the annular grid tension sensors (25) are installed on the annular geogrid (11), and the vertical grid tension sensors (26) are installed on the vertical geogrid (12).
7. The method for detecting the pile bearing capacity of the composite light pile group is characterized by comprising the following steps of:
s1, installing an annular grid tension sensor (25) and a vertical grid tension sensor (26) on the composite reinforcement cage (7) sent to a detection site;
s2: excavating foundation soil of the light subbase layer (43), constructing a foundation (D) for drilling, and removing residues at the bottom of the hole;
s3: sending the composite reinforcement cage (7) into a foundation borehole;
s4: injecting light soil into the foundation drill hole until the light soil is filled in the foundation drill hole, and embedding a connecting steel bar (42) at the pile top;
s5: excavating soil between piles, installing a soil pressure box (24), and paving a medium-coarse sand layer;
s6: installing a load sensor (23) on the pile top, laying a reinforcing mesh (431) and fixing the reinforcing mesh with a connecting reinforcing steel bar (42), pouring light soil (432) layer by layer, laying a horizontal geogrid (433) layer by layer and installing a horizontal grid tension sensor (22);
s7, pouring a bearing platform (44);
s8: a jack (31), a pressure sensor (32), a main beam (33) and a counterforce device (34) are sequentially arranged on a bearing platform (44), and a reference beam (20) and a dial indicator (21) are arranged at the same time;
s9: gradually applying the load until the maximum design load capacity is reached, reading the test data of the test subsystem (2), and sorting and analyzing the test data;
s10: and (5) unloading the load in a grading manner.
8. The method for detecting pile carrying capacity of composite light weight pile group according to claim 7, wherein in the step S9, the increment of load of each stage is not more than 50KPa, and the next stage of load is applied after the load of each stage is stabilized.
9. The method for detecting pile bearing capacity of a composite light pile group according to claim 7, wherein in the step S10, the unloading amount of each stage of load is not more than 100KPa, and the next stage of load is unloaded after each stage of load is unloaded to be stable.
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