CN106480908B - A kind of mini pile horizontally loading test device and method - Google Patents

Abstract

A micro-pile horizontal static load test device and method, the device includes a reference beam, a magnetic table base, a displacement sensor, a π-shaped steel plate, a pile head fixing nut, a first fixing bracket, a level pipe, a hydraulic jack, a first force transmission shaft, The lifting support, the end plate of the reaction force device, the oil inlet pipe, the first L-shaped steel plate, the load sensor, the second L-shaped steel plate, the third force transmission shaft and the second fixed bracket, the hydraulic jack is provided by the first The L-shaped steel plate, the first fixed bracket and the liftable support are lifted and fixed; the load sensor is fixed by the second L-shaped steel plate arranged at both ends, the second fixed bracket and the liftable support, and the load sensor is fixed through the first fixed bracket. The three power transmission shafts are connected to the end plate of the reaction force device. The present invention transmits the force completely horizontally during the horizontal static load test of the micro-pile, can accurately detect the horizontal displacement of the pile end of the micro-pile, is convenient for installation and adjustment, can adjust the height of the support, is suitable for any height of the pile head, and can carry out double-pile testing at the same time .

Description

A kind of micropile horizontal dead load test device and method

technical field

The invention relates to the field of foundation pile detection, in particular to a micro-pile horizontal static load test device and method.

Background technique

Micro-piles refer to piles with a diameter of less than 300mm. Under normal conditions, the diameter of the micro-piles is between 70 and 300mm, and the slenderness ratio is greater than 30. The reinforced concrete piled by auger drilling, strong reinforcement and pressure grouting technology is poured in situ. pile. Due to the simple technology and convenient construction of micropile, it has developed rapidly in recent years and is widely used in various civil engineering projects, such as underpinning of building foundations, deep excavation of foundation pit support, stability of underground continuous wall trenches and prevention of landslides Wait. In applications such as landslide control, micropiles are mainly subjected to horizontal loads, so the determination of horizontal bearing capacity is often the key to engineering design. The strength of the micro pile body is low, the bending stiffness of the pile body is small, it is prone to deflection, and the horizontal displacement of the pile top is relatively large. At present, some achievements have been made in the field test, theoretical analysis, engineering design, etc. of the load-bearing characteristics of micro piles, but there are still some shortcomings in the field level test device and method: (1) When installing the loading system and load sensor, etc., place pads below The block method cannot guarantee that all devices are completely level and stable; (2) the field test device is heavy, and the balance adjustment is difficult; (3) the general device is only suitable for single pile horizontal testing.

Contents of the invention

The technical problem to be solved by the present invention is to provide a new device and method for horizontal loading and testing of micro piles in order to make up for the deficiencies of existing horizontal testing methods. The horizontal displacement of the pile tip of the micro-pile is detected, the installation and adjustment of the device are convenient, the height of the support can be adjusted, it is suitable for pile heads of any height, and double pile tests can be carried out at the same time.

The technical scheme that the present invention adopts for solving the problems of the technologies described above is:

A miniature pile horizontal static load test device, including a reference beam, a magnetic table base, a displacement sensor, a π-shaped steel plate, a pile head fixing nut, a first fixing bracket, a level pipe, a hydraulic jack, a first force transmission shaft, and a liftable support Seat, end plate of reaction force device, oil inlet pipe, first L-shaped steel plate, load sensor, second L-shaped steel plate, third force transmission shaft and second fixed bracket, the magnetic table base is set on the reference beam, and the π-shaped steel plate passes through The pile head fixing nut is fixed on the test pile, the pile head fixing nut is sleeved on the test pile end, the pile head fixing nut is welded with the π-shaped steel plate, one end of the displacement sensor is fixed on the magnetic table, and the other end is connected to the π-shaped steel plate The plate surface is in close contact, and there is a reserved hole on the π-shaped steel plate, and the left end of the first force transmission shaft is hinged with the π-shaped steel plate at the reserved hole (to ensure the horizontal transmission of force);

The hydraulic jack is supported and fixed by the first L-shaped steel plate arranged at its two ends, the first fixed bracket and the liftable support. Seat height); the right end of the first power transmission shaft passes through the first L-shaped steel plate on the left and extends into the reserved hole at the left end of the hydraulic jack, and is fixedly connected by fixing bolts; the first L-shaped steel plate on the right is connected to the second One end of the force transmission shaft is fixedly connected, and the other end of the second force transmission shaft is connected to one end of the load sensor. The load sensor is supported and fixed by the second L-shaped steel plate, the second fixed bracket and the liftable support arranged at both ends of the load sensor. , the bottom of the two second L-shaped steel plates is supported by a liftable support (the height of the liftable support can be adjusted as required), and the other end of the load sensor is connected to the end plate of the reaction force device through the third force transmission shaft.

According to the above scheme, level pipes are all arranged on the first power transmission shaft, the second power transmission shaft, the third power transmission shaft, the hydraulic jack and the load sensor.

According to the above solution, the first fixing bracket includes a first threaded steel bar and a first nut, and the first threaded steel bar passes through the reserved holes between the left and right first L-shaped steel plates and passes through the outer sides of the two first L-shaped steel plates The first nut tightens the hydraulic jack inside it.

According to the above scheme, the second fixing bracket includes a second threaded steel bar and a second nut, and the second threaded steel bar passes through the reserved holes between the left and right second L-shaped steel plates and passes through the outer sides of the two second L-shaped steel plates The second nut tightens the load cell inside it.

According to the above scheme, the π-shaped steel plate is welded by three steel plates.

According to the above solution, the first L-shaped steel plate and the second L-shaped steel plate are respectively used to carry the hydraulic jack and the load sensor; the first L-shaped steel plate and the second L-shaped steel plate are respectively supported by four liftable supports.

According to the above solution, the reference beam is shaped steel.

According to the above scheme, the reaction force provided by the end plate of the reaction force device during the single pile test is greater than the horizontal load during the test; Beams constitute test pile level gauge replacements.

The present invention also provides a method for the above-mentioned static load test device to perform a micro-pile horizontal test, comprising the following steps:

1) Select the reference point according to the test site conditions, set the reference beam, the length of the reference beam is determined according to the position of the test pile, its height-span ratio is not less than 1/40, and the distance between the reference beam and the test pile is not less than 4 times the diameter of the test pile;

2) Set a magnetic table base on the reference beam;

3) Select the pile head fixing nut according to the diameter of the test pile, weld it with the π-shaped steel plate and fix it on the pile head;

4) Pass the steel bar through the reserved hole of the π-shaped steel plate and the reserved hole at the left end of the first power transmission shaft, and fix it with nuts on the outside of the π-shaped steel plate;

5) Pass the two first threaded steel bars in parallel through the reserved holes of the left and right first L-shaped steel plates and fix them with the first nuts so that they are connected as one, and pass the four liftable supports through the two first L-shaped steel bars respectively. The reserved hole at the bottom corner of the L-shaped steel plate is fixed up and down with nuts to support the hydraulic jack. The right end of the first power transmission shaft passes through the first L-shaped steel plate on the left and extends into the reserved hole at the left end of the hydraulic jack. Bolted connection;

6) Fix the load sensor with the same method as fixing the hydraulic jack. The second threaded steel bar passes through the reserved holes of the left and right second L-shaped steel plates in parallel and is fixed with the second nut. The left end of the second force transmission shaft is connected with the right side in advance The first L-shaped steel plate is welded, the right end of the second power transmission shaft passes through the reserved hole of the second L-shaped steel plate on the left and connects with the left end of the load sensor, and the left end of the third power transmission shaft passes through the second L-shaped steel plate on the right The reserved hole is connected to the right end of the load sensor, the right end of the third force transmission shaft is connected to the end plate of the reaction force device, and the end plate of the reaction force device is supported on the structure that can provide the reaction force;

7) Connect the oil inlet pipe to the controller of the hydraulic jack, connect the load sensor to the computer, and confirm that all equipment is working normally;

8) Adjust the height of the liftable support so that the first power transmission shaft, the second power transmission shaft, the third power transmission shaft, the hydraulic jack, and the air bubble on the load sensor are in the center (keep the level of the entire device);

9) Fix the displacement sensor on the magnetic base, and test whether the probe of the displacement sensor is in close contact with the π-shaped steel plate;

10) Control the oil intake of the oil inlet pipe through the hydraulic jack controller, and carry out horizontal graded loading on the test pile. The loading process is carried out according to the size and purpose of the test pile according to the graded loading method given in the "Technical Specifications for Inspection of Building Foundation Pile".

11) After the horizontal deformation generated by each level of horizontal loading of the pile to be tested is stable, read the readings of the displacement sensor and load sensor, and make a record, and then start the next level of loading;

12) According to the termination horizontal loading standard given in the "Technical Specifications for Building Foundation Pile Inspection", stop loading, and then unload in stages until the horizontal loading returns to 0;

13) After the test is completed, remove the horizontal dead load test device for easy reuse.

Beneficial effects of the present invention:

1. Due to the small diameter of the micro-pile, the device of this application can provide 4 or more positions to install displacement sensors, so that the displacement of the pile head at different heights can be measured and more test results can be obtained;

2. The setting of the level pipe can ensure the complete level of the entire horizontal static load test device, and the direction of force transmission and loading is completely horizontal, which can accurately detect the horizontal displacement of the micro-pile pile end and make the measurement results more accurate;

3. Set up and down the support, the height of the support can be adjusted, suitable for pile heads of any height, making the balance adjustment of the device more convenient and simple;

4. The general static load test device is only suitable for single pile level test, this application can carry out double pile test at the same time, and the modification is very simple and wide applicability;

5. The structure of the whole device is more stable, easy to install and disassemble, and has high reliability.

Description of drawings

Fig. 1 is the overall device structural representation of single pile horizontal test of the embodiment of the present invention;

Fig. 2 is a schematic top view of the overall device structure of the single pile horizontal test of the embodiment of the present invention;

Fig. 3 is a schematic diagram of the overall device structure of the double-pile horizontal test of the embodiment of the present invention;

Fig. 4 is a top view schematic diagram of the overall device structure of the double-pile horizontal test of the embodiment of the present invention;

In the figure: 1-reference beam, 2-magnetic table base, 3-displacement sensor, 4-π-type steel plate, 5-fixing nut, 6-first fixing bracket, 7-level pipe, 8-hydraulic jack, 9-the first 1st power transmission shaft, 10-liftable support, 11-end plate of reaction force device, 12-oil inlet pipe, 13-second power transmission shaft, 14-first L-shaped steel plate, 15-load sensor, 16-fixing bolt , 17-the second L-shaped steel plate, 18-the third power transmission shaft, 19-the second fixed bracket.

Detailed ways

The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and examples.

As shown in Figures 1 to 2, when a single pile is tested horizontally, the micro-pile horizontal static load test device of the present invention includes a reference beam 1, a magnetic table base 2, a displacement sensor 3, a π-shaped steel plate 4, and a pile head fixing nut 5. The first fixed bracket 6, the horizontal pipe 7, the hydraulic jack 8, the first force transmission shaft 9, the liftable support 10, the end plate of the reaction force device 11 (the end plate 11 of the reaction force device is formed by another test pile, as shown in Figures 3 to 4), oil inlet pipe 12, first L-shaped steel plate 14, load cell 15, second L-shaped steel plate 17, third power transmission shaft 18 and second fixed bracket 19, magnetic The table base 2 is set on the reference beam 1, the π-shaped steel plate 4 is fixed on the test pile through the pile head fixing nut 5, the pile head fixing nut 5 is set at the pile end of the test pile, and the pile head fixing nut 5 is welded to the π-shaped steel plate 4 , one end of the displacement sensor 3 is fixed on the magnetic table base 2, and the other end is in close contact with the surface of the π-shaped steel plate 4, the π-shaped steel plate 4 is provided with a reserved hole, the left end of the first power transmission shaft 9 is in contact with the π-shaped steel plate 4 Hinge at the reserved hole (to ensure the horizontal transmission of force);

The hydraulic jack 8 is lifted and fixed by the first L-shaped steel plate 14 arranged at its two ends, the first fixed bracket 6 and the liftable support 10. The first fixed bracket 6 includes a first threaded steel bar and a first nut, and the first screw thread After the steel bar passes through the reserved hole between the left and right two first L-shaped steel plates 14, the hydraulic jack 8 is tightened in it through the first nuts on the outside of the two first L-shaped steel plates 14, and the two first L-shaped steel plates 14 The bottom is supported by four liftable supports 10 (the height of the liftable support 10 can be adjusted as required); the right end of the first power transmission shaft 9 passes through the first L-shaped steel plate 14 on the left side and stretches into the left end of the hydraulic jack 8. Holes are reserved and fixedly connected by fixing bolts 16; the first L-shaped steel plate 14 on the right is fixedly connected to one end of the second power transmission shaft 13, and the other end of the second power transmission shaft 13 is connected to one end of the load sensor 15, The fixing method of the load sensor 15 is the same as that of the hydraulic jack 8, specifically: the load sensor 15 is lifted and fixed by the second L-shaped steel plate 14 arranged at its two ends, the second fixed bracket 19 and the liftable support 10, and the second fixed bracket 19 includes a second threaded steel bar and a second nut, and the second threaded steel bar passes through the reserved hole between the left and right two second L-shaped steel plates 17 and then connects the load sensor 15 is screwed in it, two second L-shaped steel plates 17 below are supported by four liftable supports 10 (the height of the liftable supports 10 can be adjusted as required), and the other end of the load cell 15 passes through the third power transmission shaft 18 Connect the counter force device end plate 11.

Level pipes 7 are all arranged on the first power transmission shaft 9 , the second power transmission shaft 13 , the third power transmission shaft 18 , the hydraulic jack 8 , and the load sensor 15 .

Generally, four displacement sensors 3 , one pile head fixing nut 5 and eight liftable supports 10 are required for the single pile horizontal test experiment using the above-mentioned device.

Referring to Figures 3 to 4, the other structures of the double-pile test are the same as those of the single-pile test, the only difference is that the end plate 11 of the reaction device on the right is replaced by the same nuts 5, π fixed by the pile head on the left. Type steel plate 4 and displacement sensor 3, the test pile level measuring piece that benchmark beam 1 constitutes, generally needs eight displacement sensors 3, two pile head fixing nuts 5 and eight liftable supports 10 to do double pile level test experiment.

During use, adopt static load test device of the present invention to carry out the method for miniature pile level test, comprise the following steps:

Embodiment 1 (the application of single pile horizontal dead load test device), as shown in Figure 1, 2:

1) Select the reference point according to the test site conditions, set the reference beam 1, the length of the reference beam 1 is determined according to the position of the test pile, as long as possible, but its height-span ratio should not be less than 1/40, and the distance between the reference beam 1 and the test pile should not Less than 4 times the diameter of the test pile;

2) Set the magnetic base 2 on the reference beam 1;

3) Select the pile head fixing nut 5 according to the size of the test pile diameter, weld it with the π-shaped steel plate 4 and fix it on the pile head;

4) Pass the steel bar through the reserved hole of the π-shaped steel plate 4 and the reserved hole at the left end of the first force transmission shaft 9, and fix it with nuts on the outside of the π-shaped steel plate 4;

5) Pass the two first threaded steel bars in parallel through the reserved holes of the left and right first L-shaped steel plates 14 and fix them with the first nuts so that they are connected as one, and pass the four liftable supports 10 through the two pieces respectively. The reserved hole at the bottom corner of the first L-shaped steel plate 14 is fixed up and down with nuts to support the whole described above to fix the hydraulic jack 8, and the right end of the first power transmission shaft 9 passes through the first L-shaped steel plate 14 on the left side. into the reserved hole at the left end of the hydraulic jack 8, and fixedly connected with the fixing bolt 16;

6) Fix the load sensor 15 in the same way as fixing the hydraulic jack 8, the second threaded steel bars pass through the reserved holes of the left and right two second L-shaped steel plates 17 in parallel and fix them with the second nuts, the left end of the second power transmission shaft 13 is in advance Welded with the first L-shaped steel plate 14 on the right side, the right end of the second power transmission shaft 13 passes through the reserved hole position of the second L-shaped steel plate 17 on the left side to connect with the left end of the load sensor 15, and the left end of the third power transmission shaft 18 passes through Connect the right end of the load sensor 15 through the reserved hole of the second L-shaped steel plate 17 on the right side, and connect the right end of the third force transmission shaft 18 with the end plate 11 of the reaction force device. The end plate of the reaction force device is placed on the structure that can provide reaction force on things;

7) Connect the oil inlet pipe 12 with the controller of the hydraulic jack 8, connect the load sensor 15 with the computer, and confirm that all equipment is working normally;

8) Adjust the height of the liftable support 10 so that the first power transmission shaft 9, the second power transmission shaft 13, the third power transmission shaft 18, the hydraulic jack 8, and the level tube 7 air bubbles on the load sensor 15 are centered (keep the entire set of devices level);

9) Fix the displacement sensor 3 on the magnetic base 2, and test whether the probe of the displacement sensor 3 is in close contact with the π-shaped steel plate 4;

10) The oil intake of the oil inlet pipe 12 is controlled by the controller of the hydraulic jack 8, and the test pile is loaded horizontally and graded. The loading process is based on the size and use of the test pile according to the "Technical Specifications for Building Foundation Pile Inspection (JGJ106-2014)" Implementation of hierarchical loading method;

11) After the horizontal deformation generated by each level of horizontal loading of the pile to be tested is stable, read the readings of the displacement sensor 3 and the load sensor 15, and make a record, and then start the next level of loading;

12) According to the termination horizontal loading standard given in the "Technical Specifications for Building Foundation Pile Inspection (JGJ106-2014)", stop loading, and then unload in stages until the horizontal loading returns to 0;

13) After the test is completed, remove the horizontal dead load test device for easy reuse.

Embodiment 2 (application of double-pile horizontal static load test device), as shown in Figures 3 and 4:

1) Select the reference point according to the test site conditions, set the reference beam 1, the length of the reference beam 1 is determined according to the position of the test pile, as long as possible, but its height-span ratio should not be less than 1/40, and the distance between the reference beam 1 and the test pile should be Not less than 4 times the diameter of the test pile;

2) Set the magnetic base 2 on the reference beam 1;

3) Select the pile head fixing nut 5 according to the diameter of the test pile on the left side, weld it with the π-shaped steel plate 4 and fix it on the pile head;

4) Pass the steel bar through the reserved hole of the π-shaped steel plate 4 and the reserved hole at the left end of the first force transmission shaft 9, and fix it with nuts on the outside of the π-shaped steel plate 4;

5) Pass the two first threaded steel bars in parallel through the reserved holes of the left and right first L-shaped steel plates 14 and fix them with the first nuts so that they are connected as one, and pass the four liftable supports 10 through the two pieces respectively. The reserved hole at the bottom corner of the first L-shaped steel plate 14 is fixed up and down with nuts to support the whole described above to fix the hydraulic jack 8, and the right end of the first power transmission shaft 9 passes through the first L-shaped steel plate 14 on the left side. Enter the reserved hole at the left end of the hydraulic jack 8, and fix it with a fixing bolt 16;

6) Fix the load sensor 15 in the same way as fixing the hydraulic jack 8, the second threaded steel bars pass through the reserved holes of the left and right two second L-shaped steel plates 17 in parallel and fix them with the second nuts, the left end of the second power transmission shaft 13 is in advance Welded with the first L-shaped steel plate 14 on the right side, the right end of the second power transmission shaft 13 passes through the reserved hole position of the second L-shaped steel plate 17 on the left side to connect with the left end of the load sensor 15, and the left end of the third power transmission shaft 18 passes through The second L-shaped steel plate 17 on the right side is connected to the right end of the load sensor 15 through the reserved hole position, and the right end of the third force transmission shaft 18 is connected to the right test pile through the π-shaped steel plate 4 and the pile head fixing nut 5; The piles are the same, and the test pile on the right is provided with a reference beam 1 and a displacement sensor 3 respectively, and a magnetic table base 2 is provided on the reference beam 1;

7) Connect the oil inlet pipe 12 with the controller of the hydraulic jack 8, connect the load sensor 15 with the computer, and confirm that all equipment is working normally;

8) Adjust the height of the liftable support 10 so that the first power transmission shaft 9, the second power transmission shaft 13, the third power transmission shaft 18, the hydraulic jack 8, and the level tube 7 air bubbles on the load sensor 15 are centered (keep the entire set of devices level);

9) Fix the displacement sensor 3 on the magnetic base 2, and test whether the probe of the displacement sensor 3 is in close contact with the π-shaped steel plate 4;

10) The oil intake of the oil inlet pipe 12 is controlled by the controller of the hydraulic jack 8, and the test pile is loaded horizontally and graded. The loading process is based on the size and use of the test pile according to the "Technical Specifications for Building Foundation Pile Inspection (JGJ106-2014)" Implementation of hierarchical loading method;

11) After the horizontal deformation generated by each level of horizontal loading of the pile to be tested is stable, read the readings of the displacement sensor 3 and the load sensor 15, and make a record, and then start the next level of loading;

12) According to the termination horizontal loading standard given in the "Technical Specifications for Building Foundation Pile Inspection (JGJ106-2014)", stop loading, and then unload in stages until the horizontal loading returns to 0;

13) After the test is completed, remove the horizontal dead load test device for easy reuse.

Apparently, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For example, the pile head connecting device provided by this patent can provide four or more positions for installing displacement sensors. For those of ordinary skill in the art, obvious changes or changes derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims (9)

1. a kind of mini pile horizontally loading test device, which is characterized in that including datum line beam, Magnetic gauge stand, displacement sensor, π Shape steel plate, pile crown fixing nut, the first fixing bracket, levelling tube, hydraulic jack, the first force transmission shaft, liftable bearing, counter-force Device end plate, oil inlet pipe, the first L-type steel plate, load sensor, the second L-type steel plate, third force transmission shaft and the second fixing bracket, Magnetic gauge stand is built up on datum line beam, and π shape steel plates are fixed on by pile crown fixing nut on test pile, and pile crown fixing nut is set in Test pile stake end, pile crown fixing nut and π shape steel plates weld, and one end of displacement sensor is fixed on Magnetic gauge stand, the other end and π The plate face of shape steel plate is in close contact, and π shape steel plates are equipped with preformed hole, and the left end and π shape steel plates of the first force transmission shaft are in the preformed hole Place is hinged；

Hydraulic jack is held up from being set to the first L-type steel plate at its both ends and the first fixing bracket and liftable bearing It is fixed, by liftable seat supports below two piece of first L-type steel plate；The right end of first force transmission shaft passes through first L-type steel in left side Plate extend into the reserving hole of hydraulic jack left end, and passes through fixing bolt and be fixedly connected；The first L-type steel plate on right side and One end of two force transmission shafts is affixed, and the other end of the second force transmission shaft is connected with one end of load sensor, and load sensor is by setting It holds up and fixes in the second L-type steel plate at its both ends and the cooperation of the second fixing bracket and liftable bearing, two piece of second L-type steel plate Lower section passes through third power transmission axis connection counterforce device end plate by liftable seat supports, the other end of load sensor.

2. mini pile horizontally loading test device according to claim 1, which is characterized in that first force transmission shaft, Two force transmission shafts, hydraulic jack, are provided with levelling tube on load sensor at third force transmission shaft.

3. mini pile horizontally loading test device according to claim 1, which is characterized in that the first fixing bracket packet The first spiral and the first nut are included, the first spiral leads to after the preformed hole across the two piece of first L-type steel plate in left and right Hydraulic jack is tightened in it by the first nut crossed on the outside of two piece of first L-type steel plate.

4. mini pile horizontally loading test device according to claim 1, which is characterized in that the second fixing bracket packet The second spiral and the second nut are included, the second spiral leads to after the preformed hole across the two piece of second L-type steel plate in left and right Load sensor is tightened in it by the second nut crossed on the outside of two piece of second L-type steel plate.

5. mini pile horizontally loading test device according to claim 1, which is characterized in that the π shape steel plates are by three pieces Steel plate is welded.

6. mini pile horizontally loading test device according to claim 1, which is characterized in that the first L-type steel plate, Two L-type steel plates are respectively used to bearing hydraulic jack and load sensor；First L-type steel plate, the second L-type steel plate are respectively by four Liftable seat supports.

7. mini pile horizontally loading test device according to claim 1, which is characterized in that the datum line beam is shaped steel.

8. mini pile horizontally loading test device according to claim 1, which is characterized in that counter-force when single pile is tested The counter-force that device end plate provides is more than horizontal addload during test；Counterforce device end plate is used during double tests fixes spiral shell by pile crown The test pile horizontal measurement part that female, π shape steel plates and displacement sensor, datum line beam are formed is replaced.

9. the mini pile horizontally loading test device according to claim 1 ~ 8 is one of arbitrary carries out mini pile horizontal checkout Method, which is characterized in that include the following steps：

1）Datum mark to be chosen according to test site condition, datum line beam is set, the length of datum line beam is determined according to the position of test pile, Its rise-span ratio is not less than 1/40, and datum line beam is not less than 4 times of test pile diameters with test pile distance；

2）Magnetic gauge stand is set on datum line beam；

3）Pile crown fixing nut is selected according to the size of test pile diameter, it with π shape steel plates is welded and is fixed on pile crown；

4）Reinforcing bar is passed through into π shape steel plates preformed hole and the first force transmission shaft left end preformed hole, and consolidated on the outside of π shape steel plates with nut It is fixed；

5）Two first spirals are fixed parallel across the preformed hole of left and right two panels the first L-type steel plate and with the first nut, Them is made to be connected as a single entity, four only lifting supports are each passed through the preformed hole of two panels the first L-type steel plate bottom arm of angle and use spiral shell Female fixation up and down supports hydraulic jack, and the first force transmission shaft right end passes through the first L-type steel plate in left side to extend into hydraulic pressure The reserving hole of jack left end, and be fixedly connected using fixing bolt；

6）With the method firm demand sensor identical with fixed hydraulic jack, the second spiral is parallel across left and right two panels The preformed hole of second L-type steel plate is simultaneously fixed with the second nut, and the second force transmission shaft left end welds in advance with the first L-type steel plate on right side Good, the second force transmission shaft right end passes through the second L-type steel plate preformed hole position in left side to be connect with load sensor left end, third force transmission shaft Left end passes through the second L-type steel plate preformed hole position on right side to be connect with load sensor right end, and third force transmission shaft right end is filled with counter-force End plate connection is put, counterforce device end plate, which is withstood on, to be provided on the works of counter-force；

7）Oil inlet pipe and the controller of hydraulic jack are connected, load sensor is connected with computer, determines all devices Normal work；

8）Adjusting the height of liftable bearing makes the first force transmission shaft, the second force transmission shaft, third force transmission shaft, hydraulic jack, load Level tube bubble on sensor is placed in the middle；

9）Displacement sensor is fixed on Magnetic gauge stand, and whether the probe for testing displacement sensor closely connects with π shape steel plates It touches；

10）The oil inlet quantity of oil inlet pipe is controlled by hydraulic jack controller, horizontal mipmap loading, loading procedure are carried out to test pile It is referred to according to test pile size and purposes《Architecture foundation pile inspection specifications（ JGJ106-2014 ）》Given hierarchical loading side Formula is implemented；

11）After test pile is per horizontal distortion is stablized caused by level-one horizontal addload, displacement sensor and load sensor are read Reading, and make a record, then start next stage loading；

12）According to《Architecture foundation pile inspection specifications（ JGJ106-2014 ）》Given termination horizontal addload standard stops It loads, then load shedding, until horizontal addload is restored to 0；

13）After the completion of experiment, horizontally loading test device is removed, convenient for reusing.