Static load pile pressing test device for cast-in-place pile

Abstract

The invention provides a cast-in-place pile static load pile pressing test device, which belongs to the technical field of engineering detection and comprises a jack and two supporting seats arranged on two sides of the jack respectively. The counter-force beam is arranged between the two supporting seats and located above the jack and below the balancing weight. The counter-force beam is connected with the two supporting seats through a cross beam and has the freedom degree of moving in the vertical direction relative to the supporting seats. The clamping assembly is horizontally arranged on the counter-force beam in a sliding mode, has the elastic freedom degree of moving towards the jack and is used for clamping and fixing the jack. And the lifting piece is vertically arranged on the counter-force beam in a sliding manner and is used for being connected with a lifting hook. And when the lifting piece extends out of the counter-force beam, the lifting piece avoids the clamping assembly, so that the clamping assembly clamps the jack. According to the static load pile pressing test device for the cast-in-place pile, the jack, the supporting base, the cross beam and the counter-force beam can be integrally moved, and therefore the process of temporarily building a pile loading platform on site is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering detection, and more specifically, relates to a static load pile test device for cast-in-place piles. Background Art

[0002] Static load pile test is the core method for evaluating the bearing capacity of pile foundation. It simulates actual load conditions, applies pressure step by step and observes deformation to determine the ultimate bearing capacity and deformation characteristics of a single pile or pile foundation.

[0003] The stacking method is the most traditional way to provide reaction force in the static load test of pile foundation. A large number of counterweights are stacked on the ground or on the top of the pile to form a reaction force, and the load is applied step by step to test the bearing capacity of the pile foundation. When implementing it, first clean the pile head to make it flat and reinforce the foundation of the test area, then use a crane to stack supporting walls on both sides of the pile head for supporting the counterweights, and then place a jack on the pile head, and configure a reaction beam above the jack to form the entire stacking platform. During the test, the reaction beam located under the counterweight is lifted upward by the jack on the pile head, so that the reaction beam contacts the counterweight, so that the jack applies a reaction force to the pile body.

[0004] The inventors found that in each test, a crane had to be used on site to temporarily build supporting walls and reaction beams, which required multiple lifting operations and wasted construction time, resulting in low test efficiency. Summary of the invention

[0005] The invention aims to provide a cast-in-place pile static load pile test device, aiming at quickly building a pile loading platform.

[0006] To achieve the above object, the technical solution adopted by the present invention is: to provide a cast-in-place pile static load pile test device, including a jack and two support seats respectively arranged on both sides of the jack, the support seats are used to support the counterweight block, and also include: A reaction beam is arranged between the two support seats and is located above the jack and below the counterweight block; the reaction beam is connected to the two support seats through a cross beam and has a degree of freedom to move in a vertical direction relative to the support seats; a clamping assembly, which is horizontally slidably disposed on the reaction beam and has elastic freedom to move toward the jack, and is used for clamping and fixing the jack; and A lifting member is vertically slidably arranged on the reaction beam and is used to be connected with the lifting hook; Wherein, when the lifting member extends out from the reaction beam, the lifting member avoids the clamping assembly so that the clamping assembly clamps the jack; when the lifting member is retracted into the reaction beam, the lifting member abuts against the clamping assembly and pushes the clamping assembly away from the jack.

[0007] In a possible implementation, a clamping portion is fixedly provided on the outer peripheral surface of the jack, and the clamping assembly includes: Two clamping parts, suitable for clamping with the clamping part; Two connecting parts are respectively fixedly connected to the two clamping parts and are horizontally slidably arranged on the reaction beam, and the two connecting parts are both in contact with the lifting member; Two first springs, both ends of which are respectively fixed to the reaction beam and the connecting part, and correspond to the connecting parts one by one, and are used to push the two connecting parts to move towards each other; Wherein, when the lifting member extends out from the reaction beam, the lifting member avoids the two connecting parts, so that the two connecting parts are close to each other and the clamping part is clamped with the clamping part; When the lifting member is retracted into the reaction beam, the lifting member abuts against the two connecting parts and pushes the two connecting parts away from each other, so that the clamping part is separated from the clamping part.

[0008] In a possible implementation, the clamping portion is annularly arranged around the outer peripheral surface of the jack, and the clamping portion is an arc-shaped portion adapted to the outer peripheral surface of the jack; When the clamping portion is clamped with the clamping portion, the clamping portion is in contact with the outer peripheral surface of the jack.

[0009] In a possible implementation, the lifting member includes: Two lifting rings; Two abutment parts are respectively fixedly arranged at the bottom ends of the two suspension rings and vertically slidably arranged on the reaction beam; Two positioning components, respectively arranged on the two abutting portions, for positioning the lifting member; The abutting portions correspond to the connecting portions one by one and abut against each other.

[0010] In a possible implementation, the connecting portion has a push-up inclined surface, and the push-up inclined surface faces the abutting portion and abuts against the abutting portion; When the lifting member is retracted into the reaction beam, the two abutting portions respectively move along the corresponding pushing inclined surfaces to push the two connecting portions away from each other.

[0011] In a possible implementation, the positioning component includes: Two positioning beads are horizontally slidably arranged on both sides of the abutting portion; Two second springs, two ends of which are respectively fixed to the abutting portion and the positioning beads, and correspond one to one with the positioning beads, and are used to push the positioning beads to extend out of the abutting portion; Wherein, two groups of positioning grooves are provided on the reaction beam, and the number of the positioning grooves in each group is two; When the lifting member extends out from the reaction beam, the two positioning beads are engaged with one group of positioning grooves; when the lifting member is retracted into the reaction beam, the two positioning beads are engaged with another group of positioning grooves.

[0012] In a possible implementation, there are two crossbeams, which are respectively located on both sides of the reaction beam, one end of the crossbeam is fixed to the reaction beam, and the other end is fixedly provided with a guide block; The support seat is provided with a guide groove in the vertical direction, which is suitable for being slidably connected with the guide block, and the upper and lower ends of the guide groove are closed.

[0013] In a possible implementation, when the guide block abuts against the upper end of the guide groove, the upper surface of the reaction beam is higher than the upper surface of the support seat; When the guide block abuts against the lower end of the guide groove, the upper surface of the reaction beam is lower than the upper surface of the support seat.

[0014] In a possible implementation, a limit block is fixedly provided on the lifting member, a limit groove is provided on the reaction beam for the limit block to move up and down, and the upper and lower ends of the limit groove are closed to prevent the limit block from detaching from the reaction beam.

[0015] In a possible implementation, a support plate is rotatably provided at the bottom end of the support seat, and a lower surface of the support plate is coplanar with a lower surface of the support seat.

[0016] Compared with the prior art, the invention provides a cast-in-place pile static load pile test device, which has the following beneficial effects: in the early preparation stage, the device places the jack below the corresponding position of the reaction beam, and pulls the lifting piece out from the upper surface of the reaction beam, so that the clamping assembly clamps and fixes the jack, thereby connecting the jack, the support seat, the crossbeam and the reaction beam as a whole. When the crane lifts the device through the lifting piece, the jack, the support seat, the crossbeam and the reaction beam can be moved as a whole, thereby avoiding the process of temporarily building a loading platform on site.

[0017] After the lifting is completed, the lifting parts are retracted into the reaction beam, so that the clamping assembly releases the jack, and the jack and the reaction beam are separated. In the subsequent test phase, the telescopic end of the jack is extended to lift the reaction beam upward, the crossbeam moves upward relative to the support seat, and the reaction beam contacts the counterweight blocks stacked on the support seat, thereby applying a reaction force to the pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the overall structure of a bored pile static load pressure pile test device provided in an embodiment of the present invention.

[0020] Figure 2 A schematic diagram of the overall structure of the bored pile static load pressure pile test device provided in an embodiment of the present invention from another angle.

[0021] Figure 3 A cross-sectional view of a bored pile static load pile test device provided in an embodiment of the present invention.

[0022] Figure 4 A cross-sectional view from another angle of the bored pile static load pressure pile testing device provided in an embodiment of the present invention.

[0023] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of part A.

[0024] Figure 6 for Figure 4 Schematic diagram of the enlarged structure of part B.

[0025] In the figure: 1. jack; 11. clamping part; 2. support seat; 21. guide groove; 22. support plate; 3. reaction beam; 31. positioning groove; 32. limit groove; 4. cross beam; 41. guide block; 5. lifting piece; 51. lifting ring; 52. abutment part; 53. positioning bead; 54. second spring; 55. limit block; 61. clamping part; 62. connecting part; 621. push ramp; 63. first spring. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] See also Figure 1 and Figure 2 Now, a static load pile test device for a bored pile provided by the present invention is described. A static load pile test device for a bored pile comprises a jack 1 and two support seats 2 respectively arranged on both sides of the jack 1, wherein the support seats 2 are used to support a counterweight block.

[0028] See also Figure 1 , Figure 2 and Figure 3 The bored pile static load pile test device also includes a reaction beam 3, a clamping assembly and a lifting piece 5. The reaction beam 3 is arranged between the two support seats 2, and is located above the jack 1 and below the counterweight. The reaction beam 3 is connected to the two support seats 2 through a cross beam 4, and has the freedom to move in the vertical direction relative to the support seats 2. The clamping assembly is horizontally slidably arranged on the reaction beam 3, and has the elastic freedom to move toward the jack 1, and is used to clamp and fix the jack 1. The lifting piece 5 is vertically slidably arranged on the reaction beam 3, and is used to be connected to the hook.

[0029] When the lifting member 5 extends out from the reaction beam 3, the lifting member 5 avoids the clamping assembly so that the clamping assembly clamps the jack 1. When the lifting member 5 is retracted into the reaction beam 3, the lifting member 5 abuts against the clamping assembly and pushes the clamping assembly away from the jack 1.

[0030] The two support seats 2 in the device are connected as a whole with the reaction beam 3 through the cross beam 4, so that the support seat 2 and the reaction beam 3 can move together during lifting. In addition, before lifting, the lifting piece 5 is pulled out from the upper surface of the reaction beam 3 so that the clamping assembly can clamp the jack 1, which enables the reaction beam 3 to drive the jack 1 to move together, thereby realizing the lifting of the entire device. When conducting the test, there is no need to lift the loading platform multiple times.

[0031] After the device is hoisted into place, the jack 1 is placed on the pile body, and at this time, the lifting member 5 is retracted into the reaction beam 3. During the retraction of the lifting member 5, the bottom end of the lifting member 5 abuts against the clamping assembly and pushes the clamping assembly to separate the clamping assembly from the jack 1. After sufficient counterweights are stacked on the support seat 2, the jack 1 is started to push the reaction beam 3 upward, so that the reaction beam 3 and the cross beam 4 move upward relative to the support seat 2. After the reaction beam 3 contacts the counterweight, the jack 1 generates a corresponding reaction force on the pile body.

[0032] In some embodiments, see Figure 2 and Figure 3 , a clamping portion 11 is fixedly provided on the outer peripheral surface of the jack 1. The clamping assembly includes two clamping portions 61, two connecting portions 62 and two first springs 63. Among them, the two clamping portions 61 are suitable for clamping with the clamping portion 11. The two connecting portions 62 are fixedly connected to the two clamping portions 61 respectively, and are horizontally slidably arranged on the reaction beam 3, and the two connecting portions 62 are both in contact with the lifting member 5. The two ends of the first spring 63 are respectively fixed to the reaction beam 3 and the connecting portion 62, and correspond one-to-one with the connecting portion 62. The first spring 63 is used to push the two connecting portions 62 to move in a direction close to each other.

[0033] When the lifting member 5 extends out from the reaction beam 3, the lifting member 5 avoids the two connecting parts 62, so that the two connecting parts 62 are close to each other and the clamping part 61 is clamped with the clamping part 11. When the lifting member 5 is retracted into the reaction beam 3, the lifting member 5 abuts against the two connecting parts 62 and pushes the two connecting parts 62 away from each other, so that the clamping part 61 is separated from the clamping part 11.

[0034] Through the abutment and cooperation between the connecting part 62 and the lifting member 5, the elastic force of the first spring 63 is used to drive the clamping part 61 to automatically clamp the clamping part 11 of the jack 1. There is no need to manually adjust the clamping state during lifting, and the clamping and separation can be synchronously controlled by the retracting and releasing action of the lifting member 5, ensuring that the jack 1 is firmly connected during the lifting process, and automatically separated from the reaction beam 3 when the lifting is in place, thereby improving the operation efficiency and safety.

[0035] In some embodiments, see Figure 2 and Figure 3 The clamping portion 11 is annularly arranged around the outer peripheral surface of the jack 1, and the clamping portion 61 is an arc shape adapted to the outer peripheral surface of the jack 1. When the clamping portion 61 is clamped with the clamping portion 11, the clamping portion 61 fits the outer peripheral surface of the jack 1.

[0036] The matching design of the annular clamping portion 11 and the arc-shaped clamping portion 61 allows the clamping portion 61 to fully fit the outer peripheral surface of the jack 1, increasing the contact area. When the clamping portion 61 is clamped with the clamping portion 11, the two fit tightly, which can better adapt to the shape of the jack 1, improve the clamping stability, and make the jack 1 less likely to shake when moving with the reaction beam 3.

[0037] In some embodiments, see Figure 3 and Figure 4 The lifting member 5 includes two lifting rings 51, two abutting portions 52 and two positioning components. The two abutting portions 52 are respectively fixedly arranged at the bottom ends of the two lifting rings 51 and vertically slidably arranged on the reaction beam 3. The two positioning components are respectively arranged on the two abutting portions 52 to locate the position of the lifting member 5. The abutting portions 52 correspond to the connecting portions 62 one by one and abut against each other.

[0038] The two lifting rings 51 of the lifting member 5 are used to connect with the crane hook to facilitate the lifting of the reaction beam 3. When the lifting member 5 is retracted into the reaction beam 3, the abutment portion 52 contacts and applies a thrust to the connection portion 62, so that the connection portion 62 overcomes the elastic force of the first spring 63 and moves away from each other, thereby releasing the clamping of the jack 1. When the lifting member 5 is extended from the reaction beam 3, the abutment portion 52 avoids the connection portion 62, so that the connection portion 62 moves toward the direction close to the jack 1 under the pushing action of the first spring 63, and realizes the clamping connection with the jack 1.

[0039] The two positioning components are respectively arranged on the abutment portion 52, and are used to position the lifting member 5, ensuring that the lifting member 5 can remain in an extended state when extending from the reaction beam 3, and can remain in a retracted state when retracting into the reaction beam 3, thereby improving the reliability of the lifting member 5 when in use.

[0040] In some embodiments, see Figure 5 The connecting portion 62 has a push-up inclined surface 621, which faces the abutting portion 52 and abuts against the abutting portion 52. When the lifting member 5 is retracted into the reaction beam 3, the two abutting portions 52 move along the corresponding push-up inclined surfaces 621 to push the two connecting portions 62 away from each other.

[0041] It should be noted that one end of the abutting portion 52 facing the pushing inclined surface 621 is configured as an inclined surface suitable for cooperating with the pushing inclined surface 621 , thereby improving the cooperating effect between the abutting portion 52 and the connecting portion 62 .

[0042] Through the cooperation between the abutment portion 52 and the connection portion 62, the vertical movement of the lifting member 5 is converted into the horizontal displacement of the connection portion 62. The inclined plane transmission method reduces the movement resistance, makes the opening and closing action of the clamping assembly smoother, reduces the need for manual intervention, and simplifies the operation steps. When the lifting member 5 is retracted into the reaction beam 3, the abutment portion 52 will move along the push inclined surface 621. Due to the inclination angle design of the push inclined surface 621, the abutment portion 52 will push the connection portion 62 to move during the downward movement, thereby realizing the separation between the two clamping portions 61 and the jack 1.

[0043] In some embodiments, see Figure 6 The positioning assembly includes two positioning beads 53 and two second springs 54. The two positioning beads 53 are horizontally slidably arranged on both sides of the abutment portion 52. The two ends of the two second springs 54 are respectively fixed to the abutment portion 52 and the positioning beads 53, and correspond to the positioning beads 53 one by one, and are used to push the positioning beads 53 to extend from the abutment portion 52.

[0044] Two groups of positioning grooves 31 are provided on the reaction beam 3, and each group of positioning grooves 31 has two members. When the lifting member 5 extends out from the reaction beam 3, the two positioning beads 53 are engaged with one group of positioning grooves 31. When the lifting member 5 is retracted into the reaction beam 3, the two positioning beads 53 are engaged with the other group of positioning grooves 31.

[0045] The two positioning beads 53 in the positioning assembly are respectively horizontally slidably arranged on both sides of the abutment portion 52, and are pushed out of the abutment portion 52 by the second spring 54. When the lifting member 5 is extended from the reaction beam 3, the positioning beads 53 are engaged with a group of positioning grooves 31 under the action of the second spring 54, and the lifting member 5 is fixed in the extended position at this time, ensuring that the clamping assembly is avoided, so that the clamping assembly can smoothly clamp the jack 1. When the lifting member 5 is retracted into the reaction beam 3, the positioning beads 53 are engaged with another group of positioning grooves 31, fixing the lifting member 5 in the storage position, preventing the lifting member 5 from extending from the reaction beam 3, so that the jack 1 is stably released.

[0046] In some embodiments, see Figure 2 There are two cross beams 4, which are respectively located on both sides of the reaction beam 3. One end of the cross beam 4 is fixed to the reaction beam 3, and the other end is fixed with a guide block 41. A guide groove 21 suitable for sliding connection with the guide block 41 is opened on the support seat 2 in the vertical direction, and the upper and lower ends of the guide groove 21 are closed.

[0047] During the vertical movement of the reaction beam 3, the guide block 41 slides in the guide groove 21, providing a stable guide for the reaction beam 3 and preventing the reaction beam 3 from shifting during the movement. When the jack 1 lifts the reaction beam 3, the cooperation between the guide block 41 and the guide groove 21 ensures that the reaction beam 3 can rise vertically and contact the counterweight block, so that the reaction force of the jack 1 is applied to the pile. At the same time, the upper and lower ends of the guide groove 21 are closed, which limits the movement range of the reaction beam 3, prevents the reaction beam 3 from detaching from the support seat 2 due to excessive movement, and also enables the support seat 2 to move with the reaction beam 3 when the reaction beam 3 is hoisted, thereby ensuring the safety and stability of the hoisting process.

[0048] In some embodiments, when the guide block 41 abuts against the upper end of the guide groove 21, the upper surface of the reaction beam 3 is higher than the upper surface of the support seat 2. When the guide block 41 abuts against the lower end of the guide groove 21, the upper surface of the reaction beam 3 is lower than the upper surface of the support seat 2.

[0049] The upper and lower ends of the guide groove 21 are closed, and the extreme position of the reaction beam 3 is controlled by limiting the travel range of the guide block 41. When the support seat 2 and the reaction beam 3 are placed normally, the upper surface of the reaction beam 3 is lower than the upper surface of the support seat 2, which facilitates the stacking of the counterweight blocks and ensures that when the counterweight blocks are stacked, the counterweight blocks are supported by the support seat 2 and do not contact the reaction beam 3. When the reaction beam 3 is lifted upward by the jack 1, the upper surface of the reaction beam 3 can move to a position higher than the upper surface of the support seat 2, ensuring that the reaction beam 3 effectively bears the load of the counterweight blocks, thereby ensuring that the jack 1 applies sufficient reaction force to the pile body.

[0050] In some embodiments, see Figure 5A limit block 55 is fixedly arranged on the lifting member 5, and a limit groove 32 is opened on the reaction beam 3 for the limit block 55 to move up and down. The upper and lower ends of the limit groove 32 are closed to prevent the limit block 55 from detaching from the reaction beam 3.

[0051] During the lifting process of the lifting member 5, the limit block 55 is restricted in the limit groove 32 to prevent the lifting member 5 from being separated from the reaction beam 3. During the process of the crane lifting the reaction beam 3, if the lifting member 5 is suddenly subjected to a large external impact, the cooperation between the limit block 55 and the limit groove 32 can ensure that the lifting member 5 remains connected to the reaction beam 3, preventing the lifting member 5 from falling off and causing the reaction beam 3 to fall, thereby ensuring the safety of equipment and personnel, and also ensuring the integrity of the test device during the lifting process, ensuring that the test can proceed smoothly.

[0052] In some embodiments, see Figure 1 , Figure 2 and Figure 3 A support plate 22 is rotatably provided at the bottom end of the support seat 2 , and the lower surface of the support plate 22 is coplanar with the lower surface of the support seat 2 .

[0053] During the test, when the support base 2 is subjected to a relatively large pressure, the support plate 22 can be rotated out from the support base 2, thereby increasing the contact area between the support base 2 and the ground and improving the stability of the support base 2 when in use.

[0054] In summary, the static load pile test device provided by the present invention is, compared with the prior art, in which the two support seats 2 are connected to the reaction beam 3 as a whole through the crossbeam 4, so that the support seat 2 and the reaction beam 3 can move together during lifting. In addition, before lifting, the lifting piece 5 is pulled out from the upper surface of the reaction beam 3 so that the clamping assembly can clamp the jack 1, which enables the reaction beam 3 to drive the jack 1 to move together, thereby realizing the lifting of the entire device. When conducting the test, there is no need to lift the loading platform multiple times.

[0055] After the device is hoisted into place, the jack 1 is placed on the pile body, and at this time, the lifting member 5 is retracted into the reaction beam 3. During the retraction of the lifting member 5, the bottom end of the lifting member 5 abuts against the clamping assembly and pushes the clamping assembly to separate the clamping assembly from the jack 1. After sufficient counterweights are stacked on the support seat 2, the jack 1 is started to push the reaction beam 3 upward, so that the reaction beam 3 and the cross beam 4 move upward relative to the support seat 2. After the reaction beam 3 contacts the counterweight, the jack 1 generates a corresponding reaction force on the pile body.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cast-in-place pile static load pressure pile test device, comprising a jack (1) and two support seats (2) respectively arranged on both sides of the jack (1), wherein the support seats (2) are used to support a counterweight block, and characterized in that: Also includes: A reaction beam (3) is arranged between the two support seats (2) and is located above the jack (1) and below the counterweight block; the reaction beam (3) is connected to the two support seats (2) via a cross beam (4) and has a degree of freedom to move in a vertical direction relative to the support seats (2); a clamping assembly, which is horizontally slidably arranged on the reaction beam (3) and has an elastic degree of freedom to move toward the jack (1), and is used to clamp and fix the jack (1); and A lifting member (5) is vertically slidably arranged on the reaction beam (3) and is used to be connected to the lifting hook; When the lifting member (5) extends out from the reaction beam (3), the lifting member (5) avoids the clamping assembly so that the clamping assembly clamps the jack (1); when the lifting member (5) is retracted into the reaction beam (3), the lifting member (5) abuts against the clamping assembly and pushes the clamping assembly away from the jack (1).

2. A cast-in-place pile static load pile test device as claimed in claim 1, characterized in that: A clamping portion (11) is fixedly provided on the outer peripheral surface of the jack (1), and the clamping assembly comprises: Two clamping portions (61) adapted to be clamped with the clamping portion (11); Two connecting parts (62) are respectively fixedly connected to the two clamping parts (61) and are horizontally slidably arranged on the reaction beam (3), and the two connecting parts (62) are both in contact with the lifting member (5); Two first springs (63), two ends of which are respectively fixed to the reaction beam (3) and the connecting portion (62), and correspond one to one with the connecting portion (62), and are used to push the two connecting portions (62) to move in a direction toward each other; Wherein, when the lifting member (5) extends out from the reaction beam (3), the lifting member (5) avoids the two connecting portions (62), so that the two connecting portions (62) are close to each other and the clamping portion (61) is clamped with the clamping portion (11); When the lifting member (5) is retracted into the reaction beam (3), the lifting member (5) abuts against the two connecting portions (62) and pushes the two connecting portions (62) away from each other, so that the clamping portion (61) is separated from the clamping portion (11).

3. A cast-in-place pile static load pile test device as claimed in claim 2, characterized in that: The clamping portion (11) is arranged in an annular shape around the outer peripheral surface of the jack (1), and the clamping portion (61) is an arc-shaped portion adapted to the outer peripheral surface of the jack (1); When the clamping portion (61) is clamped with the clamping portion (11), the clamping portion (61) fits against the outer peripheral surface of the jack (1).

4. A cast-in-place pile static load pile test device as claimed in claim 2, characterized in that: The lifting member (5) comprises: two lifting rings (51); Two abutment portions (52) are respectively fixedly arranged at the bottom ends of the two suspension rings (51) and vertically slidably arranged on the reaction beam (3); Two positioning assemblies, respectively arranged on the two abutment portions (52), and used for positioning the position of the lifting member (5); The abutting portion (52) corresponds to the connecting portion (62) one by one and abuts against each other.

5. A cast-in-place pile static load pile test device as claimed in claim 4, characterized in that: The connecting portion (62) has a push-up inclined surface (621), and the push-up inclined surface (621) faces the abutment portion (52) and abuts against the abutment portion (52); When the lifting member (5) is retracted into the reaction beam (3), the two abutment portions (52) respectively move along the corresponding pushing inclined surfaces (621) to push the two connection portions (62) away from each other.

6. A cast-in-place pile static load pile test device as claimed in claim 4, characterized in that: The positioning component comprises: Two positioning beads (53) are respectively arranged horizontally and slidably on both sides of the abutment portion (52); Two second springs (54), two ends of which are respectively fixed to the abutting portion (52) and the positioning beads (53), and correspond one to one with the positioning beads (53), and are used to push the positioning beads (53) to extend out of the abutting portion (52); Wherein, two groups of positioning grooves (31) are provided on the reaction beam (3), and the number of positioning grooves (31) in each group is two; When the lifting member (5) extends out from the reaction beam (3), the two positioning beads (53) are engaged with one group of positioning grooves (31); when the lifting member (5) is retracted into the reaction beam (3), the two positioning beads (53) are engaged with another group of positioning grooves (31).

7. A cast-in-place pile static load pile test device as claimed in claim 1, characterized in that: The number of the cross beams (4) is two, and they are respectively located on both sides of the reaction beam (3); one end of the cross beam (4) is fixed to the reaction beam (3), and the other end is fixedly provided with a guide block (41); A guide groove (21) suitable for being slidably connected to the guide block (41) is provided on the support seat (2) in the vertical direction, and the guide groove (21) is closed at both upper and lower ends.

8. A cast-in-place pile static load pile test device as claimed in claim 7, characterized in that: When the guide block (41) abuts against the upper end of the guide groove (21), the upper surface of the reaction beam (3) is higher than the upper surface of the support seat (2); When the guide block (41) abuts against the lower end of the guide groove (21), the upper surface of the reaction beam (3) is lower than the upper surface of the support seat (2).

9. A cast-in-place pile static load pile test device as claimed in claim 1, characterized in that: A limit block (55) is fixedly arranged on the lifting member (5), and a limit groove (32) is provided on the reaction beam (3) for the limit block (55) to move up and down, and the upper and lower ends of the limit groove (32) are closed to prevent the limit block (55) from detaching from the reaction beam (3).

10. A cast-in-place pile static load pile test device as claimed in claim 1, characterized in that: A support plate (22) is rotatably provided at the bottom end of the support seat (2), and the lower surface of the support plate (22) is coplanar with the lower surface of the support seat (2).

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