CN210917495U - Test device for bearing performance of cast-in-situ bored pile in water-containing soil body - Google Patents
Test device for bearing performance of cast-in-situ bored pile in water-containing soil body Download PDFInfo
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- CN210917495U CN210917495U CN201921444208.7U CN201921444208U CN210917495U CN 210917495 U CN210917495 U CN 210917495U CN 201921444208 U CN201921444208 U CN 201921444208U CN 210917495 U CN210917495 U CN 210917495U
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Abstract
A test device for the bearing performance of a cast-in-situ bored pile in a water-containing soil body is characterized in that a test soil body is loaded in a test box body, and the lower part of a test pile body is vertically inserted into the test soil body; the water supply system comprises a water tank, a water inlet pipe, a water pipe in the tank and a water level observation pipe; the vertical loading system comprises an actuator and a reaction frame, and the telescopic end of the actuator is fixedly connected with the top of the test pile body; the measuring system comprises a displacement meter and a data acquisition instrument, the device can study the change of the bearing performance of the pile body when the water level of the pile changes, and can realize the regular study of the bearing performance of the pile body under different soil qualities and water level heights, thereby providing accurate theoretical guidance for the design of pile foundation engineering and ensuring the reliability of the bearing performance.
Description
Technical Field
The utility model relates to a test device of pile bearing capacity, concretely relates to test device of bored concrete pile bearing capacity among the hydrous soil body belongs to pile foundation bearing capacity research technical field.
Background
Natural foundations are often insufficient to provide sufficient foundation bearing capacity to support the load from tall buildings above, so pile foundations are often used which can increase the bearing capacity in areas with poor soil mechanics. Under the normal bearing state, the pile foundation is deeply buried in the soil layer, the load transmitted from the upper building is mainly born by the side friction resistance and the end resistance of the pile, and the load is transmitted to the surrounding soil body, so the ultimate bearing performance of the pile body is not only related to the strength of the pile body, but also related to the bearing performance of the surrounding soil layer.
The actual soil layer contains abundant underground water and is influenced by the change of the underground water level, and the mechanical property in the soil layer is often changed, for example, the seepage effect which can occur in the soil layer can influence the bearing performance of the pile body in the soil layer due to the change of the effective gravity of the soil layer, so that the influence of the change of the underground water level on the bearing performance of the pile body is very important.
The existing pile body bearing test mostly adopts a box body with closed periphery to carry out simple pile body static pressure test, but does not consider the influence of the change of underground water level on the pile body bearing performance, the test result often does not accord with the reality, the accurate theoretical guidance is difficult to provide for pile foundation engineering, and the reliability of the pile body bearing performance can not be ensured.
Disclosure of Invention
To the problem that above-mentioned prior art exists, the utility model provides a bored concrete pile bearing capacity's in the hydrous soil body test device, the device can study the change of pile body bearing capacity when the water level variation to the realization is to the regular research of pile body bearing capacity under different soil property and water level height, provides accurate theoretical guidance for the design of stake foundation engineering, guarantees its bearing capacity's reliability.
In order to achieve the aim, the utility model provides a test device for the bearing performance of a cast-in-situ bored pile in a water-containing soil body, which comprises a test box body, a test soil body, a test pile body, a water supply system, a vertical loading system, a measuring system and a computer; the test box body is fixed on the ground;
the test soil body is loaded in the test box body, the lower part of the test pile body is vertically inserted into the test soil body, and the upper end of the test pile body extends out of the top of the test soil body;
the surface of the test pile body is coated with a cement slurry layer and a mud slurry layer, and the mud slurry layer is positioned on the outer side of the cement slurry layer;
the water supply system comprises a water tank, a water inlet pipe, an in-tank water pipe and a water level observation pipe, wherein the water tank is supported above the test box body through a support frame, the lower part of the water tank is connected with the water inlet pipe, and a first water stop valve is arranged on the water inlet pipe;
the water pipe in the box comprises a transverse pipe network section arranged at the bottom of the test box body and a vertical communication section arranged on one side of the test box body, the upper end and the lower end of the vertical communication section are respectively connected with the water inlet pipe and the transverse pipe network section, a plurality of water seepage holes are formed in the transverse pipe network section and distributed on the surface of the transverse pipe network section, the transverse pipe network section is connected with a water drainage pipeline penetrating through a through hole formed in the lower portion of the test box body, and a water stop valve II is connected; the water level observation pipe is vertically arranged on one side of the outer part of the test box body and is positioned between the water stop valve II and the test box body, and the lower end of the water level observation pipe is connected with the drainage pipeline;
the vertical loading system comprises an actuator and a reaction frame, wherein the reaction frame consists of longitudinal pillars fixedly arranged on the left side and the right side of the test box body and a cross beam fixedly connected between the two longitudinal pillars and positioned above the test box body;
the measuring system comprises a displacement meter and a data acquisition instrument, wherein the displacement meter is arranged at the top of the test pile body and is connected with a computer through the data acquisition instrument.
Further, in order to facilitate the realization of the automatic control of the actuator, the vertical loading system further comprises an electromagnetic directional valve and a hydraulic pump station, wherein the actuator is connected with the hydraulic pump station through the electromagnetic directional valve, and the electromagnetic directional valve is connected with a computer.
Furthermore, in order to simulate the change condition of the water level more truly, the transverse pipe sections are distributed in a shape like a Chinese character 'tian', and cover the bottom of the test box body.
Further, in order to measure the change condition of higher water level conveniently, the height of the top of the water level observation pipe is not less than the height of the top of the test box body.
Preferably, the water level observation tube is a transparent tube.
Furthermore, in order to guarantee that the displacement meter can accurately measure the change condition of the displacement of the pile body, one side of the top of the pile body is fixedly connected with a horizontally arranged glass plate, and the displacement meter is arranged on the upper part of the glass plate.
The test device effectively simulates the bearing performance of the pile body in the water-containing soil body through the arrangement of the water supply system, the vertical loading system, the measurement system and the computer, flexibly controls the height of the water level through the water supply system, realizes the change rule of the bearing performance of the pile body when the underground water level changes, can replace the soil body in the test box body according to the needs, further realizes the bearing performance research of the pile body in different soil bodies and different underground water levels, is convenient for the arrangement of the measurement system and the computer to acquire various test parameters in real time so as to accurately draw the relevant curve of the pile top load and the settlement amount of the test pile body, effectively expands the research range of the influence factors of the bearing capacity of the pile body, provides more accurate theoretical guidance for the design of the pile foundation engineering, the reliability of the bearing performance is ensured. The device simple structure, each part installation, adjustment and dismantlement process are convenient, and simultaneously, its suitability is wider, the reliability is high, is favorable to improving test efficiency height to but reuse has economic nature and commonality.
The utility model also discloses a drilling bored concrete pile bearing capacity's test method in the hydrous soil body, including following step:
s1: smearing cement paste on the surface of the test pile body, and smearing the cement paste on the surface of the cement paste layer after the test pile body has certain strength;
the surface of the test pile body is processed in the step S1, so that the simulation of the interface between the cast-in-situ bored pile and the soil body in the actual engineering is realized;
s2: placing the test pile body obtained in the step S1 at the center position of a test soil body, filling the test soil body into the test box body in a layering manner, and tamping the test soil body in a layering manner, wherein the top of the completely filled test soil body is lower than the top of the test pile body 3 by a certain distance;
s3: filling the water tank with water, opening the first water stop valve, keeping the second water stop valve closed, and enabling the water to enter the water pipe and the water level observation pipe in the water tank through the transversely arranged water inlet pipe;
s4: observing the height of the water level in the water level observation pipe, and closing the first water stop valve when the height value required by the test is reached;
s5: the method comprises the steps that a vertical loading system is used for applying loads to a tested pile body in a grading mode, the loading value is 10% of a preset limit load each time, the load value is collected and recorded through a load sensor in the whole loading process, the displacement change of the settlement of the pile body is collected and recorded through a measuring system, and the loading is stopped when the settlement of the pile body after being loaded at a certain time is equal to or more than twice of the settlement loaded at the last time; recording the displacement and load value of the pile top in the whole loading process;
s6: and (3) arranging the test data, drawing a curve relating to pile top load and settlement of the test pile body 3, a curve relating to axial force and buried depth change of the pile body, and a curve relating to side frictional resistance and buried depth change of the pile body, and obtaining the bearing characteristics of the test pile body under the soil layer and the water level height.
And step S5, carrying out a certain stage of graded load application, keeping the load value of the current stage unchanged, opening the second water stop valve, closing the second water stop valve after the water level in the test box body is reduced to a certain height, and continuing the graded load application of the next stage until the condition of stopping load application is reached.
The test method can effectively simulate the change rule of the bearing performance of the pile body when the underground water level of soil bodies with different properties changes, and then can quickly and accurately obtain the bearing characteristics of the test pile body under a specific soil layer and water level height, thereby realizing the reliable research on the bearing performance rule of the pile body.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic structural diagram of the transverse pipe segment of the present invention.
In the figure: 1. the device comprises a test box body, 2, a test soil body, 3, a test pile body, 4, a water tank, 5, a water inlet pipe, 6, a water pipe in the box, 7, a water level observation pipe, 8, a support frame, 9, a first water stop valve, 10, a water seepage hole, 11, a through hole, 12, a second water stop valve, 13, an actuator, 14, a reaction frame, 15, a longitudinal support, 16, a cross beam, 17, a computer, 18, the ground, 19 and a displacement meter.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1 and 2, a test device for the bearing performance of a cast-in-situ bored pile in a water-containing soil body comprises a test box body 1, a test soil body 2, a test pile body 3, a water supply system, a vertical loading system, a measuring system and a computer 17; the test box body 1 is fixed on the ground 18; preferably, the floor 18 is a concrete floor.
The test soil body 2 is loaded in the test box body 1, the lower part of the test pile body 3 is vertically inserted into the test soil body 2, and the upper end of the test pile body extends out of the top of the test soil body 2;
the surface of the test pile body 3 is coated with a cement slurry layer and a mud slurry layer, and the mud slurry layer is positioned on the outer side of the cement slurry layer;
the water supply system comprises a water tank 4, a water inlet pipe 5, an in-tank water pipe 6 and a water level observation pipe 7, wherein the water tank 4 is supported above the test box body 1 through a support frame 8, the water inlet pipe 5 is connected to the lower part of the water tank 4, and a first water stop valve 9 is arranged on the water inlet pipe 5;
the incasement water pipe 6 is including setting up the horizontal pipe network section in experimental box 1 bottom and setting up the vertical intercommunication section in experimental box 1 one side, the upper and lower both ends of vertical intercommunication section are connected with inlet tube 5 and horizontal pipe network section respectively, horizontal pipe network section spreads over it and is provided with a plurality of infiltration hole 10 superficially, horizontal pipe network section is connected with by seting up the drain line that the through-hole 11 in experimental box 1 lower part wore out, sealing connection between through-hole 11 and the drain line to guarantee that water can not ooze by through-hole 11. A second water stop valve 12 is connected to the water drainage pipeline; the water level observation pipe 7 is vertically arranged on one side of the outer part of the test box body 1 and is positioned between the second water stop valve 12 and the test box body 1, and the lower end of the water level observation pipe 7 is connected with a drainage pipeline;
the vertical loading system comprises an actuator 13 and a reaction frame, the reaction frame consists of longitudinal pillars 15 fixedly arranged on the left side and the right side of the test box body 1 and a cross beam 16 fixedly connected between the two longitudinal pillars 15 and positioned above the test box body 1, the fixed end of the actuator 13 is fixed on the lower end face of the cross beam 16, the end of a telescopic rod is connected with the top of the test pile body 3, and the actuator 13 is provided with a load sensor connected with a computer 17;
the measuring system comprises a displacement meter 19 and a data acquisition instrument, wherein the displacement meter 19 is arranged at the top of the test pile body 3, and the displacement meter is connected with the computer 17 through the data acquisition instrument.
The vertical loading system further comprises an electromagnetic directional valve and a hydraulic pump station, wherein the actuator 13 is connected with the hydraulic pump station through the electromagnetic directional valve, and the electromagnetic directional valve is connected with the computer 17.
In order to simulate the change situation of the water level more truly, the transverse pipe sections are distributed in a shape like a Chinese character 'tian', and cover the bottom of the test box body 1.
In order to measure the change condition of higher water level conveniently, the height of the top of the water level observation pipe 7 is not less than that of the top of the test box body 1.
The water level observation pipe 7 is a transparent pipe body. Preferably, the water level observation tube 7 is made of a glass material.
In order to ensure that the displacement meter can accurately measure the change condition of the pile body displacement, one side of the top of the test pile body 3 is fixedly connected with a horizontally arranged glass plate, and the displacement meter 19 is arranged on the upper part of the glass plate. The displacement meter 19 may be a distance measuring sensor, the measuring surface of which may be arranged either facing downwards or facing upwards, when facing downwards, to measure the displacement of the shaft by measuring the distance to the test soil 2, and when facing upwards, to be arranged in alignment with the beam 16 to measure the displacement of the shaft by measuring the distance to the beam 16.
Building a test system: fixing the test box body 1 on the ground 18, installing the water pipe 6 in the box body in the test box body 1, wherein the transverse pipe section is close to the bottom of the test box body 1, and the vertical communicating section is arranged on one side of the test box body 1 and is connected with the water inlet pipe 5. Wherein the drainage pipeline connected on the transverse pipeline segment penetrates out of the test box body; the water level observation pipe 7 is arranged at one side outside the test box body 1, and a liquid inlet at the lower end of the water level observation pipe 7 is hermetically connected with the drainage pipeline. Build the reaction frame in the experimental box 1 outside, the reaction frame comprises vertical pillar 15 and the crossbeam 16 that is located experimental box 1 top and both ends and two vertical pillar 15 upper portion fixed connection of fixed setting in experimental box 1 left and right sides, at the vertical loading system of crossbeam 16's lower part installation, wherein actuator 13's stiff end and crossbeam 16's lower extreme fixed connection, actuator 13's flexible end and the top fixed connection of experimental pile body. The displacement meter 19 is connected with the computer 17 through a data acquisition instrument, and the load sensor is connected with the computer 17. The test method specifically comprises the following steps:
s1: smearing cement paste on the surface of the test pile body 3, and smearing the cement paste on the surface of the cement paste layer after the test pile body has certain strength;
s2: placing the test pile body 3 obtained in the step S1 at the center position of the test soil body 2, filling the test soil body 2 into the test box body 1 in a layering manner, tamping the test soil body 2 in a layering manner, and enabling the top of the completely filled test soil body 2 to be lower than the top of the test pile body 3 by a certain distance;
s3: filling the water tank 4 with water, opening the first water stop valve 9, keeping the second water stop valve 12 closed, and enabling the water to enter a water pipe 6 and a water level observation pipe 7 in the tank through a water inlet pipe 5 which is transversely arranged;
s4: observing the height of the water level in the water level observation pipe 7, and closing the first water stop valve 9 when the height value required by the test is reached;
s5: the method comprises the steps that a vertical loading system is used for applying loads to a test pile body 3 in a grading mode, the loading value is 10% of the preset limit load each time, the load value is collected and recorded through a load sensor in the whole loading process, the displacement change of the settlement of the pile body is collected and recorded through a measuring system, and the loading is stopped when the settlement of the pile body after being loaded at a certain time is equal to or more than twice of the settlement loaded at the last time; recording the displacement and load value of the pile top in the whole loading process;
s6: and (3) arranging the test data, drawing a curve relating to pile top load and settlement of the test pile body 3, a curve relating to axial force and buried depth change of the pile body, and a curve relating to side frictional resistance and buried depth change of the pile, and obtaining the bearing characteristics of the test pile body 3 under the soil layer and the water level height.
And in the step S5, a certain stage of graded load application is carried out, the load value of the current stage is kept unchanged, the second water stop valve 12 is opened, the second water stop valve 12 is closed after the water level in the test box body 1 is reduced to a certain height, and the graded load application of the next stage is continued until the condition of stopping loading is reached.
The test device and the test method effectively simulate the bearing performance of the pile body in the water-containing soil body through the arrangement of the water supply system, the vertical loading system, the measurement system and the control system, realize the change rule of the bearing performance of the pile body when the underground water level changes through the control of the water supply system on the water level height, further realize the bearing performance research of the pile body in different soil bodies and different underground water levels by replacing the soil body in the test box body according to the needs, conveniently obtain various test parameters in real time through the arrangement of the control system, conveniently and accurately draw the relevant curves of the pile top load and the settlement of the test pile body, the axle force and the burial depth of the test pile body and the side frictional resistance and the burial depth of the pile, effectively expand the research range of the influence factors of the bearing force of the pile body, and provide more accurate theoretical guidance for the design of the pile foundation engineering, the reliability of the bearing performance is ensured.
Claims (6)
1. A test device for the bearing performance of a cast-in-situ bored pile in a water-containing soil body comprises a test box body (1), wherein the test box body (1) is fixed on the ground (18), and is characterized by further comprising a test soil body (2), a test pile body (3), a water supply system, a vertical loading system, a measuring system and a computer (17);
the test soil body (2) is loaded in the test box body (1), the lower part of the test pile body (3) is vertically inserted into the test soil body (2), and the upper end of the test pile body extends out of the top of the test soil body (2);
the surface of the test pile body (3) is coated with a cement slurry layer and a mud slurry layer, and the mud slurry layer is positioned on the outer side of the cement slurry layer;
the water supply system comprises a water tank (4), a water inlet pipe (5), an in-tank water pipe (6) and a water level observation pipe (7), wherein the water tank (4) is supported above the test box body (1) through a support frame (8), the water inlet pipe (5) is connected to the lower part of the water tank (4), and a first water stop valve (9) is arranged on the water inlet pipe (5);
the in-box water pipe (6) comprises a transverse pipe network section arranged at the bottom of the test box body (1) and a vertical communicating section arranged on one side of the test box body (1), the upper end and the lower end of the vertical communicating section are respectively connected with the water inlet pipe (5) and the transverse pipe network section, a plurality of water seepage holes (10) are formed in the surface of the transverse pipe network section in a distributed mode, the transverse pipe network section is connected with a water drainage pipeline which penetrates out of a through hole (11) formed in the lower portion of the test box body (1), and a water stop valve II (12) is connected to the; the water level observation pipe (7) is vertically arranged on one side of the outer part of the test box body (1) and is positioned between the water stop valve II (12) and the test box body (1), and the lower end of the water level observation pipe (7) is connected with a drainage pipeline;
the vertical loading system comprises an actuator (13) and a reaction frame, wherein the reaction frame consists of longitudinal pillars (15) fixedly arranged at the left side and the right side of the test box body (1) and a cross beam (16) fixedly connected between the two longitudinal pillars (15) and positioned above the test box body (1), the fixed end of the actuator (13) is fixed on the lower end face of the cross beam (16), the end of a telescopic rod is connected with the top of the test pile body (3), and a load sensor connected with a computer (17) is arranged on the actuator (13);
the measuring system comprises a displacement meter (19) and a data acquisition instrument, wherein the displacement meter (19) is arranged at the top of the test pile body (3), and the displacement meter is connected with a computer (17) through the data acquisition instrument.
2. The testing device for the bearing performance of the cast-in-situ bored pile in the hydrous soil body according to claim 1, wherein the vertical loading system further comprises an electromagnetic directional valve and a hydraulic pump station, wherein the actuator (13) is connected with the hydraulic pump station through the electromagnetic directional valve, and the electromagnetic directional valve is connected with the computer (17).
3. The testing device for the bearing capacity of the cast-in-situ bored pile in the hydrous soil body according to claim 1 or 2, wherein the transverse pipe sections are distributed in a shape like a Chinese character 'tian' and cover the bottom of the testing box body (1).
4. A test device for the bearing capacity of a bored pile in a hydrous soil body according to claim 3, wherein the height of the top of the water level observation tube (7) is not less than the height of the top of the test box body (1).
5. The testing device for the bearing performance of the cast-in-situ bored pile in the hydrous soil body according to claim 4, wherein the water level observation pipe (7) is a transparent pipe body.
6. The testing device for the bearing performance of the cast-in-situ bored pile in the hydrous soil body according to claim 5, wherein a horizontally arranged glass plate is fixedly connected to one side of the top of the testing pile body (3), and the displacement meter (19) is installed on the upper part of the glass plate.
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| CN201921444208.7U CN210917495U (en) | 2019-09-02 | 2019-09-02 | Test device for bearing performance of cast-in-situ bored pile in water-containing soil body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110629807A (en) * | 2019-09-02 | 2019-12-31 | 江苏省送变电有限公司 | Device and method for testing bearing performance of cast-in-situ bored pile in water-containing soil body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110629807A (en) * | 2019-09-02 | 2019-12-31 | 江苏省送变电有限公司 | Device and method for testing bearing performance of cast-in-situ bored pile in water-containing soil body |
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