A method for uplift test of rock-socketed piles

Abstract

The present invention discloses a method for uplift test of rock-socketed piles, including the preparation process of the test model and the test process. The preparation process of the test model includes: Step 1, fabricating a test model preparation device including a rock preparation mold and a hoisting frame; Step 2, successively: hoisting the rock preparation mold to the pouring site through the hoisting frame, removing the hoisting frame, installing the rock-socketed hole mold, and conducting the pouring of the rock mass model; Step 3, successively: removing the rock-socketed hole mold to form a rock-socketed hole, installing the pile body mold, placing the steel reinforcement cage into the rock-socketed hole and the pile body mold, and conducting the pouring of the pile body model to form a test model; Step 4, first removing the side molds of the pile body mold and the rock preparation mold, and then reinstalling the two groups of side mold support steel bars and the hoisting frame. The test process successively includes: erecting a test device on the test model, conducting the test, removing the test device, and transporting the test model to the storage location for waiting to be broken. The present invention can meet the requirements for the preparation, transportation and test of the experimental model.

Description

Technical Field

[0001] The present invention relates to an apparatus and method for the uplift test of rock-socketed piles. Background Art

[0002] The uplift test of rock-socketed piles is to detect the vertical ultimate uplift bearing capacity of the pile foundation and the skin friction of the pile, and to judge whether the pile foundation meets the design uplift requirements, which can provide a scientific basis for the design and construction of the pile foundation and improve the safety and reliability of the project. The test models used in the indoor uplift test of rock-socketed piles include a rock mass model and a pile body model, among which the rock mass model is generally the key to the test. Most of the preparation of the rock mass model is carried out by pouring with cement, barite powder, fine aggregate, etc., and there are also those that directly use rock materials as the rock mass model. The directly poured rock model has many advantages such as convenient procurement and production and the ability to customize the size, so it has become an important method for the rock-socketed pile test.

[0003] In the past, when pouring the rock mass model and the pile body model, a wooden formwork was often built for pouring, and the rock mass model and the pile body model were poured successively. The advantage of this method is low cost, but it is not convenient to use and takes a long time.

[0004] There is also a plan to consider pouring with a steel formwork, but less consideration is given to issues such as the handling, demolition of the model and subsequent testing; when pouring the test model, the convenience of the test model during the test is not considered either. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a method for the uplift test of rock-socketed piles, which can meet the requirements of the preparation, transportation and testing of the experimental model.

[0006] The purpose of the present invention is achieved as follows: A method for the uplift test of rock-socketed piles, including a test model preparation process and a test process;

[0007] The test model preparation process includes the following steps:

[0008] Step 1, make a test model preparation device, which includes a rock mass preparation mold, a rock-socketed hole mold, a pile body mold and a lifting frame; the rock mass preparation mold includes a bottom mold and a side mold, wherein,

[0009] The bottom mold includes a steel bottom plate and a group of bottom mold support steel profiles that are detachably installed on the bottom surface of the steel bottom plate and have a length greater than the width of the steel bottom plate; groove channels are provided at the four peripheral edges of the steel bottom plate;

[0010] The side mold is formed by enclosing two transverse side templates and two longitudinal side templates with connecting pieces; each transverse side template includes a transverse steel side plate, a set of side mold support steel profiles detachably installed on the outer surface of the transverse steel side plate and having a height greater than that of the transverse steel side plate, and an anti-friction plate covering the inner surface of the transverse steel side plate; a set of side mold support steel profiles on the two transverse side templates are correspondingly arranged with a set of bottom mold support steel profiles; each longitudinal side template includes a longitudinal steel side plate and an anti-friction plate covering the inner surface of the longitudinal steel side plate; a plurality of bosses adapted to the channels on the bottom mold are arranged at intervals downward on the bottom surface of each transverse steel side plate and the bottom surface of each longitudinal steel side plate, and balls are installed between adjacent bosses;

[0011] The bosses and balls at the bottom of the two transverse side templates and the bosses and balls at the bottom of the two longitudinal side templates are all embedded in the channels corresponding to the bottom mold, and a set of side mold support steel profiles on the outer surfaces of the two transverse side templates are detachably installed on the two top ends of a set of bottom mold support steel profiles in a one-to-one correspondence;

[0012] The rock-socketed hole mold is suspended in the upper central part of the inner cavity of the rock body preparation mold;

[0013] After the rock body model is prepared, the pile body mold is coaxially placed on the top of the rock-socketed hole formed by the rock-socketed hole mold;

[0014] The hoisting frame is a grid-shaped frame welded by a set of transverse steel profiles and a set of longitudinal steel profiles. The spacing between a set of transverse steel profiles of the hoisting frame is adapted to the spacing between a set of side mold support steel profiles on the two transverse side templates, so that the two ends of a set of transverse steel profiles of the hoisting frame are connected to the tops of a set of side mold support steel profiles on the two transverse side templates in a one-to-one correspondence;

[0015] Step 2: First, hoist the rock body preparation mold to the pouring site by the hoisting frame, then remove the hoisting frame, install the rock-socketed hole mold, and then pour the mixed rock materials into the inner cavity of the rock body preparation mold for pouring the rock body model, and then carry out normal curing;

[0016] Step 3: After the rock body model is cured, first remove the rock-socketed hole mold to form a rock-socketed hole in the center of the top surface of the rock body model. Then, coaxially place the cylindrical pile body mold on the top surface of the rock body model. Next, place the steel reinforcement cage of the pile body model into the rock-socketed hole and the pile body mold. Then, pour the pile body model in the rock-socketed hole and the pile body mold. After curing, a pile body model is formed. The main pile bars are exposed on the top surface of the pile body model. The pile body model and the rock body model together form a complete test model;

[0017] Step 4: After the curing of the pile body model is completed, remove the side molds of the pile body mold and the rock body preparation mold. First, remove the connectors between the transverse side formwork and the longitudinal side formwork, and then use a jacking tool to jack out the two transverse side formworks and the two longitudinal side formworks along the channels on the bottom mold. After the side molds are removed, reinstall the two sets of side mold support steel profiles one by one on the top surfaces at both ends of a set of bottom mold support steel profiles, and install a lifting frame between the tops of the two sets of side mold support steel profiles to form a test model carrier frame.

[0018] The test process includes the following steps:

[0019] Step 1: Set up the test device. The test device includes two lower loading longitudinal beams, two pairs of jacks, two upper loading cross beams, four support columns, a loading plate, and several small steel plates. Among them,

[0020] The two lower loading longitudinal beams are placed one by one on the top surfaces on both sides of the rock body model;

[0021] The two pairs of jacks are arranged one by one on the top surfaces in the middle of the two lower loading longitudinal beams; the distance between each pair of jacks is greater than the outer diameter of the pile body model;

[0022] The two upper loading cross beams are installed one by one on the top surfaces of the two pairs of jacks;

[0023] The four support columns are placed on the ground and support the two ends of the two upper loading cross beams one by one;

[0024] The loading plate spans between the middle parts of the two upper loading cross beams; a perforation corresponding to the main reinforcement of the pile body is opened in the middle of the loading plate, so that the upper part of the main reinforcement of the pile body can pass through the perforation of the loading plate;

[0025] Several small steel plates are welded between the upper parts of the main reinforcement of the pile body that are higher than the loading plate;

[0026] The test device is set up in the following order:

[0027] 1) After lifting the test model on the test model carrier frame to the test position, first remove the lifting frame on the test model carrier frame, and then lift and install the two lower loading longitudinal beams and the two pairs of jacks in sequence;

[0028] 2) First place the four support columns, then lift and install the two upper loading cross beams, and adjust the heights of the two pairs of jacks so that the top surfaces of the two pairs of jacks are in contact with the bottom surfaces of the two upper loading cross beams;

[0029] 3) Lift and install the loading plate, and pass the main reinforcement of the pile body through the perforation of the loading plate;

[0030] 4) Weld the small steel plates to fix the main reinforcement of the pile body to the loading plate;

[0031] Step 2: Conduct the uplift test of the socketed pile according to relevant regulations;

[0032] Step 3: After the test, first cut off the welding of the main reinforcement bars of the pile body and the small steel plates, and then sequentially lift and remove the loading plate, two upper loading cross beams, two pairs of jacks, two lower loading longitudinal beams, and four support columns. Then reinstall the hoisting frame and transport the test model to the storage location for waiting to be broken.

[0033] In the above-mentioned uplift test method of the socketed pile, a friction-reducing plate is covered on the top surface of the steel bottom plate of the bottom mold.

[0034] In the above-mentioned uplift test method of the socketed pile, the friction-reducing plate is made of polytetrafluoroethylene plate.

[0035] In the above-mentioned uplift test method of the socketed pile, the connecting parts between the transverse side formwork and the longitudinal side formwork in the rock preparation mold adopt snap locks or bolts; bolt connections are used between the transverse steel side plates and the side formwork support steel profiles, and between the hoisting frame and the side formwork support steel profiles.

[0036] In the above-mentioned uplift test method of the socketed pile, the socketed hole mold in the rock preparation mold is made of PVC or metal materials.

[0037] In the above-mentioned uplift test method of the socketed pile, a pair of lifting lugs are evenly fixed on the top surface of the hoisting frame.

[0038] In the above-mentioned uplift test method of the socketed pile, each lower loading longitudinal beam in the test device is composed of several steel profiles.

[0039] The characteristics of the uplift test method of the socketed pile and the method of the present invention are as follows:

[0040] 1. The test model preparation device adopted in the present invention installs support steel profiles on both the bottom mold and the side mold of the rock preparation mold, ensuring that the overall structure of the test model can meet the force requirements during hoisting and realizing multiple repeated uses; the installation and disassembly operations of the test model preparation device are convenient, and a hoisting frame is configured, which can facilitate the transportation of the test model;

[0041] 2. The test device adopted in the present invention is directly erected on the test model carrier. This test model carrier is a device based on the rock preparation mold, which has the characteristics of light weight, convenient erection, multiple repeated uses, strong integrity, low cost, convenient test operation, and the accuracy can meet the requirements of test specifications. It can detect the uplift bearing capacity of the socketed pile in a time-saving and labor-saving manner, and can quickly and conveniently transport the test model to the storage location for waiting to be broken after the test. Description of the Drawings

[0042] Figure 1It is a perspective view of the test model preparation device adopted by the rock-socketed pile uplift test method of the present invention;

[0043] Figure 2 It is an elevation view of the rock body preparation mold adopted by the rock-socketed pile uplift test method of the present invention;

[0044] Figure 3 It is a plan view of the bottom mold in the rock body preparation mold adopted by the present invention;

[0045] Figure 4 It is a schematic structural view of the side formwork in the rock body preparation mold adopted by the present invention;

[0046] Figure 5 It is an elevation view of a state at step three in the test model preparation process of the rock-socketed pile uplift test method of the present invention;

[0047] Figure 6 It is another elevation view of a state at step three in the test model preparation process of the rock-socketed pile uplift test method of the present invention;

[0048] Figure 7 It is an elevation view of the test device adopted by the rock-socketed pile uplift test method of the present invention;

[0049] Figure 8 It is a plan view of the test device adopted by the rock-socketed pile uplift test method of the present invention;

[0050] Figure 9 It is a detailed plan view of the loading plate in the test device adopted by the present invention;

[0051] Figure 10 It is a detailed elevation view of the loading plate in the test device adopted by the present invention. Specific embodiments

[0052] The present invention will be further described below with reference to the accompanying drawings.

[0053] The rock-socketed pile uplift test method of the present invention includes a test model preparation process and a test process;

[0054] The test model preparation process includes the following steps:

[0055] Step 1, fabricate a test model preparation device (see Figures 1 to 4 ); this test model preparation device includes a rock body preparation mold 100, a rock-socketed hole mold 200, a pile body mold 300, and a hoisting frame 400;

[0056] The rock body preparation mold 100 includes a bottom mold 1 and side molds, where

[0057] The bottom die 1 includes a steel bottom plate 11, a group of bottom die support steel profiles 12 that are installed on the bottom surface of the steel bottom plate 11 by bolts and have a length greater than the width of the steel bottom plate 11, and an anti-friction plate 10 that covers the top surface of the steel bottom plate 11; a channel 110 is provided at the four peripheral edges of the steel bottom plate 11 (see Figure 3 ).

[0058] The side die is formed by enclosing two transverse side templates 21 and two longitudinal side templates 22 by buckles or bolts; each transverse side template 21 includes a transverse steel side plate 211, a group of side die support steel profiles 212 that are installed on the outer surface of the transverse steel side plate 211 by bolts and have a height greater than the height of the transverse steel side plate 211, and an anti-friction plate 10 that covers the inner surface of the transverse steel side plate 210; a group of side die support steel profiles 212 on the two transverse side templates 210 are correspondingly arranged with a group of bottom die support steel profiles 12; each longitudinal side template 22 includes a longitudinal steel side plate 221 and an anti-friction plate 10 that covers the inner surface of the longitudinal steel side plate 221; a number of bosses 213 that are adapted to the channels 110 on the bottom die 1 are spaced downward on the bottom surface of each transverse steel side plate 211 and the bottom surface of each longitudinal steel side plate 221, and balls 214 are installed between adjacent bosses 213 (see Figure 4 ).

[0059] The anti-friction plate 10 is made of a polytetrafluoroethylene plate;

[0060] The bosses 213 and balls 214 at the bottoms of the two transverse side templates 21 and the bosses 213 and balls 214 at the bottoms of the two longitudinal side templates 22 are all embedded in the corresponding channels 110 of the bottom die 1, and a group of side die support steel profiles 212 on the outer surfaces of the two transverse side templates 21 are detachably installed on the two top surfaces of a group of bottom die support steel profiles 12 in a one-to-one correspondence;

[0061] The rock-socketed hole die 200 is suspended in the upper central part of the inner cavity of the rock preparation die 100; the rock-socketed hole die 200 is made of PVC or metal materials;

[0062] The pile body die 300 is cylindrical and is coaxially placed on the top of the rock-socketed hole 501 formed by the rock-socketed hole die 200 after the rock mass model 500 is prepared;

[0063] The lifting frame 400 is a grid-shaped frame welded by a group of transverse steel profiles 401 and a group of longitudinal steel profiles 402. The spacing between a group of transverse steel profiles 401 of the lifting frame 400 is adapted to the spacing between a group of side die support steel profiles 212 on the two transverse side templates 21, so that the two ends of a group of transverse steel profiles 401 of the lifting frame 400 are respectively connected to the tops of a group of side die support steel profiles 212 on the two transverse side templates 21 by bolts in a one-to-one correspondence; a pair of lifting lugs (not shown in the figure) are evenly fixed on the top surface of the lifting frame 400 for lifting and transportation;

[0064] Step 2: First, use the hoisting frame 400 to hoist the rock preparation mold 100 to the pouring site. Then, remove the hoisting frame 400 and install the rock-embedded hole mold 200. Next, pour the mixed rock materials into the inner cavity of the rock preparation mold 100 to cast the rock mass model 50, and then carry out normal curing. If the rock mass model 50 needs to be moved during the curing period, install the hoisting frame 400 on the rock preparation mold 100 for hoisting;

[0065] Step 3: After the rock mass model 50 is cured, first remove the rock-embedded hole mold 200 to form a rock-embedded hole 500 at the center of the top surface of the rock mass model 50. Then, place the pile mold 300 coaxially with the rock-embedded hole 500 on the top surface of the rock mass model 50 (see Figure 5 ). Next, put the steel reinforcement cage of the pile model 60 into the rock-embedded hole 500 and the pile mold 300. Then, carry out the casting of the pile model 60 in the rock-embedded hole 500 and the pile mold 300. After curing, the pile model 60 is formed, and the pile main reinforcement 600 is exposed on the top surface of the pile model 60 (see Figure 6 ). The pile model 60 and the rock mass model 50 together form a complete test model;

[0066] Step 4: After the pile model 60 is cured, remove the side molds of the pile mold 300 and the rock preparation mold 100. First, remove the locks or bolts between the transverse side templates 21 and the longitudinal side templates 22. Then, use tools such as screws and electric screw rods to push out the two transverse side templates 21 and the two longitudinal side templates 22 along the channels 110 on the bottom mold 1. Since ball bearings 214 are installed on the bottom surfaces of the transverse side templates 21 and the longitudinal side templates 22, and anti-friction plates 10 are covered on the inner surfaces of the transverse side templates 21 and the longitudinal side templates 22, the pushing-out resistance during the removal of the side molds can be reduced. After the side molds are removed, reinstall the two sets of side mold support steel profiles 212 one by one on the top surfaces of the two ends of a set of bottom mold support steel profiles 12, and install the hoisting frame 400 between the tops of the two sets of side mold support steel profiles 212 to form a test model carrier frame, which is convenient for hoisting the entire test model;

[0067] The test process includes the following steps:

[0068] Step 1: Set up the test device (see Figures 7 to 10 ), which includes two lower loading longitudinal beams 71, two pairs of jacks 72, two upper loading cross beams 73, four support columns 70, a loading plate 74, and several small steel plates 75. Among them,

[0069] The two lower loading longitudinal beams 71 are placed on the top surfaces of both sides of the rock mass model 50 one by one; each lower loading longitudinal beam 71 is composed of several steel profiles;

[0070] Two pairs of jacks 72 are arranged one-to-one on the middle top surfaces of two lower loading longitudinal beams 71; the distance between each pair of jacks 72 is greater than the outer diameter of the pile body model 60;

[0071] Two upper loading cross beams 73 are installed one-to-one on the top surfaces of two pairs of jacks 72;

[0072] Four support columns 70 are placed on the ground and support the two ends of two upper loading cross beams 73 one-to-one;

[0073] The loading plate 74 is spanned between the middles of two upper loading cross beams 74; a perforation 740 corresponding one-to-one to the main reinforcement 600 of the pile body is opened in the middle of the loading plate 74, so that the upper part of the main reinforcement 600 of the pile body can pass through the perforation 740 of the loading plate 74;

[0074] Several small steel plates 75 are welded between the upper parts of the main reinforcement 600 of the pile body that are higher than the loading plate 74;

[0075] The test device is erected in the following order:

[0076] 1) After hoisting the test model on the test model carrier to the test position, first remove the hoisting frame 400, and then hoist and install two lower loading longitudinal beams 71 and two pairs of jacks 72 in sequence;

[0077] 2) First place four support columns 70 on the ground at the test position, then hoist and install two upper loading cross beams 73, and adjust the heights of two pairs of jacks 72 so that the top surfaces of two pairs of jacks 72 are in contact with the bottom surfaces of two upper loading cross beams 73;

[0078] 3) Hoist and install the loading plate 74, and pass the main reinforcement 600 of the pile body through the perforation 740 of the loading plate 74;

[0079] 4) Weld the small steel plates 75 to fix the main reinforcement 600 of the pile body and the loading plate 74;

[0080] In the second step, conduct the uplift test of the rock-socketed pile. Conduct the test according to relevant regulations, that is, apply load to two pairs of jacks 72 step by step. The two pairs of jacks 72 lift two upper loading cross beams 73 upward, apply a uniform upward load to the main reinforcement 600 of the pile body through the loading plate 74, that is, apply a uniform upward load to the pile body model 60, and at the same time form an equal-size reaction force on two pairs of jacks 72. When the pile body model 60 is pulled out of the rock mass model 50, record the value of the reaction force received by the jack at this time. This value can be calculated according to the lengths of the upper loading cross beam 73 and the lower loading longitudinal beam 71 by the moment formula, and then the uplift bearing capacity of the pile body model 60 can be obtained;

[0081] Step 3: After the test is completed, first cut off the main reinforcement bars 600 of the pile body and the small steel plates 75, and then successively hoist and remove the loading plate 74, the two upper loading cross beams 73, the two pairs of jacks 72, the two lower loading longitudinal beams 71 and the four support columns 70. Then reinstall the lifting frame 400 between the tops of the two groups of side formwork support steel profiles 212, and transport the test model to the storage location for waiting to be broken.

[0082] The above embodiments are only for illustrating the present invention and not for limiting the present invention. Those skilled in the relevant technical fields can also make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention, which should be defined by each claim.

Claims

1. A method for uplift test of rock-socketed piles, including the preparation process of the test model and the test process; characterized in that, The preparation process of the test model includes the following steps: Step 1, fabricate the test model preparation device, which includes a rock preparation mold, a rock-socketed hole mold, a pile body mold and a lifting frame; the rock preparation mold includes a bottom mold and side molds, wherein, The bottom mold includes a steel bottom plate and a group of bottom mold support steel profiles detachably installed on the bottom surface of the steel bottom plate and having a length greater than the width of the steel bottom plate; groove channels are provided at the four peripheral edges of the steel bottom plate. The side molds are formed by enclosing two transverse side templates and two longitudinal side templates through connecting members; each transverse side template includes a transverse steel side plate, a group of side mold support steel profiles detachably installed on the outer surface of the transverse steel side plate and having a height greater than the height of the transverse steel side plate, and a friction-reducing plate covering the inner surface of the transverse steel side plate; a group of side mold support steel profiles on the two transverse side templates are correspondingly arranged with a group of bottom mold support steel profiles; each longitudinal side template includes a longitudinal steel side plate and a friction-reducing plate covering the inner surface of the longitudinal steel side plate; a number of bosses adapted to the groove channels on the bottom mold are spaced downwards on the bottom surface of each transverse steel side plate and the bottom surface of each longitudinal steel side plate, and balls are installed between adjacent bosses. The bosses and balls at the bottom of the two transverse side templates and the bosses and balls at the bottom of the two longitudinal side templates are all embedded in the groove channels corresponding to the bottom mold, and a group of side mold support steel profiles on the outer surfaces of the two transverse side templates are detachably installed on the top surfaces of the two ends of a group of bottom mold support steel profiles in a one-to-one correspondence. The rock-socketed hole mold is suspended in the upper central part of the inner cavity of the rock preparation mold. The pile body mold is coaxially placed on the top of the rock-socketed hole formed by the rock-socketed hole mold after the rock mass model is prepared. The lifting frame is a grid-shaped frame welded by a group of transverse steel profiles and a group of longitudinal steel profiles. The spacing between a group of transverse steel profiles of the lifting frame is adapted to the spacing between a group of side mold support steel profiles on the two transverse side templates, so that the two ends of a group of transverse steel profiles of the lifting frame are connected to the tops of a group of side mold support steel profiles on the two transverse side templates in a one-to-one correspondence. Step 2, first lift the rock preparation mold to the pouring site through the lifting frame, then remove the lifting frame, install the rock-socketed hole mold, then pour the mixed rock materials into the inner cavity of the rock preparation mold for rock mass model pouring, and then carry out normal curing. Step 3, after the rock mass model is cured, first remove the rock-socketed hole mold to form a rock-socketed hole in the center of the top surface of the rock mass model, then coaxially place the cylindrical pile body mold on the top surface of the rock mass model, then put the steel reinforcement cage of the pile body model into the rock-socketed hole and the pile body mold, and then carry out pile body model pouring in the rock-socketed hole and the pile body mold. After curing, a pile body model is formed. The main pile reinforcement is exposed on the top surface of the pile body model. The pile body model and the rock mass model together form a complete test model. Step 4: After the curing of the pile body model is completed, remove the side molds of the pile body mold and the rock preparation mold. First, remove the connectors between the transverse side mold and the longitudinal side mold, and then use a jacking tool to jack out the two transverse side molds and the two longitudinal side molds along the channels on the bottom mold. After the side molds are removed, reinstall the two sets of side mold support steel beams one by one on the top ends of a set of bottom mold support steel beams, and install a lifting frame between the tops of the two sets of side mold support steel beams to form a test model carrier frame. The test process includes the following steps: Step 1: Set up the test device, which includes two lower loading longitudinal beams, two pairs of jacks, two upper loading cross beams, four support columns, a loading plate, and several small steel plates. Among them, The two lower loading longitudinal beams are placed one by one on the top surfaces of both sides of the rock mass model; The two pairs of jacks are arranged one by one on the middle top surfaces of the two lower loading longitudinal beams; the distance between each pair of jacks is greater than the outer diameter of the pile body model; The two upper loading cross beams are installed one by one on the top surfaces of the two pairs of jacks; The four support columns are placed on the ground and support the two ends of the two upper loading cross beams one by one; The loading plate spans between the middles of the two upper loading cross beams; a perforation corresponding to each of the main reinforcement bars of the pile body is opened in the middle of the loading plate, so that the upper part of the main reinforcement bar of the pile body can pass through the perforation of the loading plate; Several small steel plates are welded between the upper parts of the main reinforcement bars of the pile body that are higher than the loading plate; The test device is set up in the following order: 1) After hoisting the test model on the test model carrier frame to the test position, first remove the lifting frame on the test model carrier frame, and then hoist and install the two lower loading longitudinal beams and the two pairs of jacks in sequence; 2) First place the four support columns, then hoist and install the two upper loading cross beams, and adjust the heights of the two pairs of jacks so that the top surfaces of the two pairs of jacks are in contact with the bottom surfaces of the two upper loading cross beams; 3) Hoist and install the loading plate, and pass the main reinforcement bar of the pile body through the perforation of the loading plate; 4) Weld the small steel plates to fix the main reinforcement bar of the pile body and the loading plate; Step 2: Conduct a rock-socketed pile uplift test in accordance with relevant regulations; Step 3: After the test is completed, first cut the welding between the main reinforcement bar of the pile body and the small steel plates, and then hoist and remove the loading plate, the two upper loading cross beams, the two pairs of jacks, the two lower loading longitudinal beams, and the four support columns in sequence. Then reinstall the lifting frame and transport the test model to the storage location for waiting to be broken.

2. The anti-pulling test method for rock-socketed piles according to claim 1, wherein A friction-reducing plate is covered on the top surface of the steel bottom plate of the bottom mold.

3. The rock socketed pile uplift test method according to claim 1 or 2, characterized in that The friction-reducing plate is made of polytetrafluoroethylene plate.

4. The rock socketed pile uplift test method according to claim 1, wherein The connectors between the transverse side mold and the longitudinal side mold in the rock preparation mold are lock catches or bolts; the transverse steel side plates and the side mold support steel beams, as well as the lifting frame and the side mold support steel beams, are all connected by bolts.

5. The rock socketed pile uplift test method according to claim 1, wherein The rock-socketed hole mold in the rock preparation mold is made of PVC or metal materials.

6. The rock-socketed pile uplift test method according to claim 1, wherein A pair of lifting lugs are evenly fixed on the top surface of the lifting frame.

7. The rock socketed pile uplift test method according to claim 1, wherein Each of the lower loading longitudinal beams in the test device is composed of several steel beams.

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