An anchor pile beam reaction device suitable for high-altitude static load test and test method thereof

Abstract

An anchor pile crossbeam reaction device suitable for high-altitude static load testing and a test method thereof, comprising anchor piles, a main beam, a secondary beam, and a jack; the anchor piles are arranged on both sides of the test pile; a lower mounting plate is provided in the anchor pile near the lower end; an upper mounting plate is provided on the top of the anchor pile; a sleeve is provided between the upper mounting plate and the lower mounting plate; a prestressed tendon is passed through the sleeve; a steel cylinder is installed on the top of the anchor pile; a connecting beam is longitudinally passed through the steel cylinder; the secondary beam is installed on the top of the steel cylinder on both sides of the test pile; the secondary beam and the connecting beam are connected by a first anchor; the jack is installed on the top of the test pile; the main beam is provided on the top of the jack; the main beam and the secondary beams on both sides are connected by a second anchor; an adjustable collar is installed on the lower part of the test pile; and displacement meters are provided on both sides of the adjustable collar. The present invention solves the technical problems of traditional pile foundation static load test devices, such as long test preparation time and high cost, potential safety hazards, high test site requirements, large occupied area, and inaccurate test results.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering component testing, in particular to an anchor pile and beam reaction force device suitable for high-altitude static load testing and a testing method thereof. Background Art

[0002] The pile foundation static load test is a technique used in engineering to test the bearing capacity of pile foundations. It is currently the most accurate and reliable test method for determining the ultimate bearing capacity of a single pile. Among the recent related technologies, patent CN117266264A discloses a pile foundation static load test equipment, which includes ballast platform piers on both sides of the test pile, jacks, main beams, secondary beams, ballast platforms and load-bearing adjustment plates, wherein there are two ballast platform piers and they are symmetrically distributed on both sides of the test pile; the jacks are located on the top of the test pile; the main beams are located on the top of the jacks; the secondary beams are erected on the main beams and the ballast platform piers, and the secondary beams are equipped with sensors for detecting vertical loads; the load-bearing adjustment plates are located on the top of the secondary beams and can be stacked with counterweights; patent CN210712977U discloses a pile foundation static load test equipment, which includes a main beam, a secondary beam, a tie rod, an anchor cage and a jack, wherein a jack is provided between the main beam and the test pile; the secondary beam is located above the main beam; both ends of the secondary beam are connected to the anchor cage by tie rods; and the anchor cage is connected to the anchor pile. It can be seen from the above two patent documents that the existing pile foundation static load test mainly includes a weight platform reaction device, an anchor pile beam reaction device, and a ground anchor reaction device. The weight platform reaction device is a pile loading method. Before the test begins, the pile of weights needs to be piled on the load-bearing platform at one time. The test preparation time is long, the cost is high, and there are safety hazards. The ground anchor reaction device has high requirements for the test site and occupies a large area. It is often difficult to achieve uniform distribution of vertical loads on the top of the test pile, which results in inaccurate test results. Summary of the Invention

[0003] The purpose of the present invention is to provide an anchor pile crossbeam reaction device suitable for high-altitude static load tests and a test method thereof, in order to solve the technical problems that traditional pile foundation static load test devices have long test preparation time, high cost, safety hazards, high requirements for the test site, and large occupied area, and it is often difficult to achieve uniform distribution of vertical loads on the top of the test pile, which in turn causes inaccurate test results.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions.

[0005] An anchor pile crossbeam reaction device suitable for high-altitude static load test, comprising anchor piles, main beams, secondary beams and jacks; there are two groups of anchor piles, which are arranged on both sides of the test piles respectively; each group of anchor piles is arranged at intervals in the transverse direction; the top of the anchor pile is lower than the top of the test pile; a lower mounting plate is provided in the anchor pile near the lower end; an upper mounting plate is provided on the top of the anchor pile; a casing is provided in the anchor pile between the upper mounting plate and the lower mounting plate; a prestressed tendon is passed through the casing; the lower end of the prestressed tendon is anchored to the lower mounting plate, and the upper end of the prestressed tendon is anchored to the upper mounting plate; at the prestressed tendon; a steel cylinder is installed on the top of the anchor pile; the steel cylinder is welded to the upper mounting plate, and a connecting beam is longitudinally passed through each steel cylinder; There are two secondary beams, which are respectively installed on the top of the steel cylinder on both sides of the test pile; the width of the secondary beam is greater than the diameter of the steel cylinder, and the front side of the secondary beam exceeds the front contour line of the steel cylinder, and the rear side of the secondary beam exceeds the rear contour line of the steel cylinder; the secondary beam and the connecting beam are connected by a first anchor arranged on the front and rear sides of the steel cylinder; the jack is installed on the top of the test pile; the main beam is arranged on the top of the jack, and the two ends of the main beam extend to the top of the secondary beams on both sides respectively; the main beam and the secondary beams on both sides are respectively connected by a second anchor; an adjustable ring is installed at the lower part of the test pile; displacement meters are respectively provided on both sides of the adjustable ring; the displacement meter is supported on the ground and is detachably connected to the adjustable ring.

[0006] Preferably, an anchor plate is pre-buried at the top of the anchor pile; anchor bars are connected at intervals at the bottom of the anchor plate; the anchor bars are buried in the anchor pile; and the steel tube is welded to the top of the anchor plate.

[0007] Preferably, the two groups of anchor piles are arranged symmetrically about the test pile.

[0008] Preferably, the vertical section of the connecting beam is I-shaped, and vertical steel ribs are arranged at intervals along the longitudinal direction on both sides of the web of the connecting beam and between the upper and lower flange plates.

[0009] Preferably, the first anchor member includes a first tie rod, a first upper anchor plate and a first lower anchor plate; the first upper anchor plate is placed vertically and flatly on the upper surface of the secondary beam, and the first lower anchor plate is arranged vertically at the bottom of the connecting beam; holes are respectively provided on the connecting beam and the secondary beam at positions corresponding to the first tie rod; through holes are respectively provided on the first upper anchor plate and the first lower anchor plate at positions corresponding to the holes; the first tie rod passes through the hole and the through hole, and is fastened with high-strength bolts.

[0010] Preferably, a group of the second anchors are arranged at equal intervals on each side of the test pile, and the second anchors on both sides of the test pile are arranged symmetrically about the test pile; the second anchors include a second tie rod, a second upper anchor plate and a second lower anchor plate; the second upper anchor plate is placed vertically and flatly on the end of the upper surface of the main beam, and the second lower anchor plate is arranged vertically at the bottom of the secondary beam; circular holes are respectively provided on the main beam and the secondary beam at positions corresponding to the second tie rods; through holes are respectively provided on the second upper anchor plate and the second lower anchor plate at positions corresponding to the circular holes; the second tie rod passes through the circular hole and the through hole, and is fastened with high-strength bolts.

[0011] Preferably, the adjustable collar includes an arc-shaped plate and connecting bolts; there are two arc-shaped plates, which are respectively arranged on both sides of the test pile; ear plates are respectively arranged on both sides of each arc-shaped plate; there are two groups of connecting bolts, which respectively connect the ear plates on the corresponding sides of the two arc-shaped plates; horizontal panels for displacement meters to measure displacement are arranged on the tops of the ear plates on both sides; the displacement meters are in contact with the horizontal panels.

[0012] A test method for an anchor pile crossbeam reaction device for a static load test comprises the following steps:

[0013] Step 1: Make a steel cylinder and pass the connecting beam longitudinally through the steel cylinder;

[0014] Step 2: Prefabricate anchor piles. The specific method is as follows:

[0015] Step 1: Tie the steel cage of the anchor pile.

[0016] Step 2: pre-install a lower mounting plate near the lower end of the anchor pile, and install an upper mounting plate at the top of the anchor pile; then install a sleeve between the upper mounting plate and the lower mounting plate.

[0017] Step 3: insert prestressed tendons into the casing and anchor the lower ends of the prestressed tendons to the bottom of the lower mounting plate.

[0018] Step 4: Support the formwork and pour concrete for the anchor piles.

[0019] Step 5: When the concrete strength reaches the design strength, tension the upper end of the prestressed tendons and anchor them to the top of the upper mounting plate.

[0020] Step 6. Connect the steel cylinder to the top of the upper mounting plate.

[0021] Step 3: construct anchor piles at intervals on both sides of the test pile;

[0022] Step 4: construct the secondary beams: hoist the two secondary beams above the steel cylinders on top of the two sets of anchor piles, and use the first anchor to tie the secondary beams to the connecting beam;

[0023] Step 5: Construction of the main beam: hoist the main beam onto the jack on top of the test pile, and use the second anchor to tie the main beam to the secondary beam;

[0024] Step 6: Install an adjustable collar at the bottom of the test pile; set displacement meters on both sides of the adjustable collar; support the displacement meters on the ground and detachably connect them to the adjustable collar;

[0025] Step 7: Use the jack to push the main beam upwards. The reaction force generated will compress the test pile, causing the test pile to sink.

[0026] Step 8: After the test pile sinks and stabilizes, the reading on the displacement meter is collected to obtain the settlement value of the test pile under a specific load.

[0027] Compared with the prior art, the present invention has the following characteristics and beneficial effects.

[0028] 1. The present invention is based on an improvement of the anchor pile crossbeam reaction device. A displacement meter is set at the bottom of the test pile so that the reading is not affected by the height of the test pile. It is suitable for high-altitude static load tests. Secondary beams are installed on the top of the steel cylinders on both sides of the test pile to provide a stable reaction force for the test pile. This can significantly save costs for large-tonnage test piles.

[0029] 2. The present invention is quick to install and has efficient load transmission. Load transmission is achieved through the main beam and the secondary beam, and the pulling force of the anchor pile is converted into a vertical load on the top of the test pile. It is unnecessary to process the weight platform pier or the anchor site to provide a stable vertical load for the test pile, thereby avoiding the limitations of traditional weight reaction devices and anchor reaction devices on site conditions and loading tonnage, and has obvious advantages in narrow and uneven test sites.

[0030] 3. The present invention uses a connector that can be quickly installed and removed to fix the displacement meter to the test pile. The fixing position is located at the bottom of the test pile, so that the reading is no longer affected by the height of the test pile. In addition, the device has strong adjustability. The secondary beam can be detachably connected to multiple anchor piles, thereby realizing static load tests of anchor piles of different tonnages.

[0031] 4. Traditional pile design often considers the pile's compressive capacity under vertical loads, while its tensile performance is often its weakest point. However, the present invention, based on the stress characteristics of the anchor pile in the entire anchor pile crossbeam reaction device, arranges prestressed tendons within the anchor pile. These tendons provide preload to the anchor pile, thereby enhancing the pile's resistance to loads. This improves the overall bearing capacity of the anchor pile, particularly when subjected to tensile forces during static load tests. Furthermore, the upper end of the prestressed tendons is anchored to the upper mounting plate, further strengthening the integrity of the steel cylinder and the anchor pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described in detail below with reference to the accompanying drawings.

[0033] Figure 1 It is a structural schematic diagram of the reaction force device of the static load test of the present invention.

[0034] Figure 2 It is a schematic diagram of the connection structure between the steel cylinder and the anchor pile in the present invention.

[0035] Figure 3 It is a schematic diagram of the connection structure between the steel cylinder and the connecting beam in the present invention.

[0036] Figure 4 It is a structural schematic diagram of the connecting beam in the present invention.

[0037] Figure 5 It is a structural schematic diagram of a displacement meter provided at the bottom of a pilot pile in the present invention.

[0038] Figure numerals: 1 - test pile, 2 - anchor pile, 3 - main beam, 4 - secondary beam, 5 - jack, 6 - first anchor, 6.1 - first tie rod, 6.2 - first upper anchor plate, 6.3 - first lower anchor plate, 7 - second anchor, 7.1 - second tie rod, 7.2 - second upper anchor plate, 7.3 - second lower anchor plate, 8 - upper mounting plate, 9 - steel cylinder, 10 - adjustable collar, 10.1 - curved plate, 10.1.1 - ear plate, 10.2 - connecting bolt, 10.3 - horizontal panel, 11 - displacement meter, 12 - connecting beam, 13 - steel vertical rib, 14 - prestressed tendon, 15 - bearing plate, 16 - lower mounting plate, 17 - casing, 18 - anchor, 19 - sealing ring. DETAILED DESCRIPTION

[0039] This anchor pile crossbeam reaction device suitable for high-altitude static load testing places a displacement meter at the bottom of a test pile 1 through an adjustable collar 10, and each secondary beam 4 is connected to a plurality of anchor piles. The present invention includes anchor piles 2, main beams 3, secondary beams 4 and jacks 5; there are two groups of anchor piles 2, which are arranged on both sides of the test pile 1 respectively; the anchor piles 2 are reinforced concrete piles; each group of anchor piles 2 is arranged at intervals in the transverse direction; the top of the anchor pile 2 is lower than the top of the test pile 1; a lower mounting plate 16 is provided in the anchor pile 2 near the lower end; an upper mounting plate 8 is provided on the top of the anchor pile 2; a casing 17 is provided in the anchor pile 2 between the upper mounting plate 8 and the lower mounting plate 16; a prestressed tendon 14 is passed through the casing 17; the lower end of the prestressed tendon 14 is anchored to the lower mounting plate 16, and the upper end of the prestressed tendon 14 is anchored to the upper mounting plate 8; a steel cylinder 9 is installed on the top of the anchor pile 2; the steel cylinder 9 is welded to the upper mounting plate 8, and a connecting beam 12 is longitudinally passed through each steel cylinder 9; the secondary beam 4 has Two, two secondary beams 4 are respectively installed on the top of the steel cylinder 9 on both sides of the test pile 1; the width of the secondary beam 4 is greater than the diameter of the steel cylinder 9, and the front side of the secondary beam 4 exceeds the front contour line of the steel cylinder 9, and the rear side of the secondary beam 4 exceeds the rear contour line of the steel cylinder 9; the secondary beam 4 and the connecting beam 12 are connected by a first anchor 6 arranged on the front and rear sides of the steel cylinder 9; the jack 5 is installed on the top of the test pile 1; the main beam 3 is arranged on the top of the jack 5, and the two ends of the main beam 3 extend to the top of the secondary beams 4 on both sides; the main beam 3 and the secondary beams 4 on both sides are respectively connected by second anchors 7; an adjustable ring 10 is installed at the lower part of the test pile 1; displacement meters 11 are respectively provided on both sides of the adjustable ring 10; the displacement meter 11 is supported on the ground and is detachably connected to the adjustable ring 10.

[0040] In this embodiment, holes are provided at intervals on the upper mounting plate 8; holes are provided at intervals on the lower mounting plate 16; both ends of the prestressed tendons 14 pass through the holes in the upper and lower mounting plates 8, 16, respectively, and are anchored by anchors 18; a sealing ring 19 is provided between the upper mounting plate 8 and the anchor 18, surrounding the prestressed tendons 14. In this embodiment, the sealing ring 19 is a rubber, polyurethane, or plastic sealing ring. The sealing ring 19 has excellent elasticity and wear resistance, effectively preventing moisture and chemicals from entering the sleeve 17 and corroding the prestressed tendons 14.

[0041] In this embodiment, the casing 17 is a corrugated tube, and the casing 17 is connected to the steel cage in the test pile 1 through binding wires.

[0042] In this embodiment, the two groups of anchor piles 2 are symmetrically arranged with respect to the test pile 1 .

[0043] In this embodiment, the vertical section of the connecting beam 12 is I-shaped, and steel vertical ribs 13 are provided at intervals along the longitudinal direction on both sides of the web of the connecting beam 12 and between the upper and lower flange plates.

[0044] In this embodiment, the first anchor 6 includes a first tie rod 6.1, a first upper anchor plate 6.2, and a first lower anchor plate 6.3. The first upper anchor plate 6.2 is placed vertically and flatly on the upper surface of the secondary beam 4, and the first lower anchor plate 6.3 is arranged vertically on the bottom of the connecting beam 12. Holes are provided on the connecting beam 12 and the secondary beam 4 at positions corresponding to the first tie rod 6.1. Through holes are provided on the first upper anchor plate 6.2 and the first lower anchor plate 6.3 at positions corresponding to the holes. The first tie rod 6.1 passes through the hole and the through hole and is fastened with high-strength bolts. The bottom of the steel cylinder 9 is welded to the top of the anchor pile 2, so that the anchor pile and the steel cylinder form a structure that can transfer load. Through the connection of the first anchor 6, the steel cylinder 9 and the secondary beam 4 form a structure that can transfer load.

[0045] In this embodiment, a group of second anchors 7 are arranged at equal intervals on each side of the test pile 1, and the second anchors 7 on both sides of the test pile 1 are arranged symmetrically about the test pile 1; the second anchors 7 include a second tie rod 7.1, a second upper anchor plate 7.2 and a second lower anchor plate 7.3; the second upper anchor plate 7.2 is placed vertically and flatly on the end of the upper surface of the main beam 3, and the second lower anchor plate 7.3 is arranged vertically at the bottom of the secondary beam 4; circular holes are respectively provided on the main beam 3 and the secondary beam 4 at positions corresponding to the second tie rods 7.1; through holes are respectively provided on the second upper anchor plate 7.2 and the second lower anchor plate 7.3 at positions corresponding to the circular holes; the second tie rod 7.1 passes through the circular hole and the through hole, and is fastened with high-strength bolts; a number of equally spaced second tie rods 7.1 are connected to the second upper anchor plate 7.2, so that the main beam and the secondary beam form a structure that can transfer load.

[0046] Of course, in other embodiments, both ends of the main beam 3 exceed the middle of the secondary beam 4 on the corresponding side, and the second anchor 7 connects the main beam 3 and the secondary beam 4 in parallel through the pull rod, so that the main beam 3 and the secondary beam 4 form a structure that can transfer load.

[0047] In this embodiment, the anchor pile 2 and the steel tube 9 form a structure that can transfer load, the steel tube 9 and the secondary beam 4 form a structure that can transfer load, and the secondary beam 4 and the main beam 3 form a structure that can transfer load, ultimately making the anchor pile 2 and the main beam 3 form a structure that can transfer load.

[0048] In this embodiment, the adjustable collar 10 includes an arc-shaped plate 10.1 and connecting bolts 10.2; there are two arc-shaped plates 10.1, one on each side of the test pile 1; an ear plate 10.1.1 is provided on both sides of each arc-shaped plate 10.1; there are two groups of connecting bolts 10.2, which respectively connect the ear plates 10.1.1 on the corresponding side of the two arc-shaped plates 10.1; a horizontal panel 10.3 for a displacement meter 11 to measure the displacement is provided on the top of the ear plates 10.1.1 on both sides; the displacement meter 11 is in contact with the horizontal panel 10.3.

[0049] In this embodiment, a bearing plate 15 is provided at the bottom of the main beam 3 , at a position corresponding to the jack 5 .

[0050] The test method of the anchor pile crossbeam reaction device for the static load test includes the following steps.

[0051] Step 1: Make a steel cylinder 9 and pass the connecting beam 12 longitudinally through the steel cylinder 9.

[0052] Step 2: prefabricate anchor piles 2. The specific method is as follows.

[0053] Step 1, tie the steel cage of anchor pile 2.

[0054] Step 2: pre-install a lower mounting plate 16 near the lower end of the anchor pile 2 and install an upper mounting plate 8 at the top of the anchor pile 2; then install a sleeve 17 between the upper mounting plate 8 and the lower mounting plate 16.

[0055] Step 3: insert the prestressed tendon 14 into the sleeve 17 and anchor the lower end of the prestressed tendon 14 to the bottom of the lower mounting plate 16 .

[0056] Step 4: Support the formwork and pour the concrete of the anchor pile 2.

[0057] Step 5: When the concrete strength reaches the design strength, the upper end of the prestressed tendons 14 is tensioned and anchored to the top of the upper mounting plate 8.

[0058] Step 6: Connect the steel cylinder 9 to the top of the upper mounting plate 8.

[0059] Step 3: construct anchor piles 2 at intervals on both sides of the test pile 1.

[0060] Step 4: construct the secondary beam 4 : hoist the two secondary beams above the steel cylinders 9 on top of the two groups of anchor piles 2 respectively, and use the first anchor 6 to tie the secondary beam 4 to the connecting beam 12 .

[0061] Step 5, constructing the main beam 3: hoisting the main beam 3 above the jack 5 on the top of the test pile 1, and using the second anchor 7 to tie the main beam 3 to the secondary beam 4.

[0062] Step six: install an adjustable collar 10 at the bottom of the test pile 1; set displacement meters 11 on both sides of the adjustable collar 10; support the displacement meter 11 on the ground and detachably connect it to the adjustable collar 10.

[0063] Step seven: The main beam 3 is pushed upward by the jack 5. The reaction force generated thereby compresses the test pile 1, causing the test pile 1 to sink.

[0064] Step eight: After the test pile 1 sinks steadily, the reading on the displacement meter 11 is collected to obtain the settlement value of the test pile 1 under a specific load.

[0065] During use of the anchor pile crossbeam reaction device of this embodiment, the top pressure head of the jack 5 applies a load to the bearing plate 15 at the bottom of the main beam 3. The pressure head continuously pushes the main beam 3 upward. Through the connection between the second anchor 7 and the first anchor 6, the anchor pile 2 and the main beam 3 form a structure capable of transferring load. Therefore, the main beam 3 is constrained by the anchor pile 2, which generates a downward load on the pressure head of the jack 5. This load is greater than the load applied by the jack 5 to the main beam 3, thus generating a compressive reaction on the test pile 1, causing the pile to sink. The steel collar fixed to the bottom of the test pile 1 displaces as the test pile settles, and the reading generated by the displacement meter 11 is the settlement of the test pile under the specific load.

[0066] In specific implementation, more anchor piles can be adapted by changing the lengths of the main beam 3 and the secondary beam 4, so that the reaction force device can be applied to static load test piles of larger tonnage.

[0067] The above embodiments are not exhaustive of specific implementation methods, and there may be other embodiments. The above embodiments are intended to illustrate the present invention rather than to limit the scope of protection of the present invention. All applications derived from simple variations of the present invention fall within the scope of protection of the present invention.

Claims

1. An anchor pile and beam reaction device suitable for high-altitude static load testing, characterized by: The invention comprises anchor piles (2), main beams (3), secondary beams (4) and jacks (5); the anchor piles (2) have two groups, which are respectively arranged on both sides of the test pile (1); the two groups of anchor piles (2) are symmetrically arranged with respect to the test pile (1); each group of anchor piles (2) is arranged at intervals in the transverse direction; the top of the anchor pile (2) is lower than the top of the test pile (1); a lower mounting plate (16) is provided in the anchor pile (2) near the lower end; an upper mounting plate (8) is provided on the top of the anchor pile (2); a sleeve (17) is provided in the anchor pile (2) between the upper mounting plate (8) and the lower mounting plate (16); a prestressed reinforcement (14) is passed through the sleeve (17); the sleeve (17) is a corrugated tube, and the sleeve (17) is connected to the steel cage in the test pile (1) by a binding wire; The lower end of the prestressed tendon (14) is anchored to the lower mounting plate (16), and the upper end of the prestressed tendon (14) is anchored to the upper mounting plate (8); a steel cylinder (9) is installed on the top of the anchor pile (2); the steel cylinder (9) is welded to the upper mounting plate (8), and a connecting beam (12) is longitudinally passed through each steel cylinder (9); there are two secondary beams (4), and the two secondary beams (4) are respectively installed on the top of the steel cylinder (9) on both sides of the test pile (1); the width of the secondary beam (4) is greater than the diameter of the steel cylinder (9), and the front side of the secondary beam (4) exceeds the front contour line of the steel cylinder (9), and the rear side of the secondary beam (4) exceeds the rear contour line of the steel cylinder (9); the secondary beam (4) and the connecting beam (12) are connected by a first The anchor (6) is tied; the anchor pile (2) and the steel cylinder (9) form a structure capable of transferring loads, the steel cylinder (9) and the secondary beam (4) form a structure capable of transferring loads, and the secondary beam (4) and the main beam (3) form a structure capable of transferring loads; the jack (5) is installed on the top of the test pile (1); the main beam (3) is arranged on the top of the jack (5), and the two ends of the main beam (3) extend above the secondary beams (4) on both sides; the main beam (3) and the secondary beams (4) on both sides are tied respectively by the second anchor (7); an adjustable collar (10) is installed at the lower part of the test pile (1); displacement meters (11) are respectively arranged on both sides of the adjustable collar (10); the displacement meter (11) is supported on the ground and is connected to the adjustable collar (10). The joint ring (10) is detachably connected; holes are provided at intervals on the upper mounting plate (8); holes are provided at intervals on the lower mounting plate (16); both ends of the prestressed tendon (14) pass through the holes on the upper mounting plate (8) and the lower mounting plate (16), and are anchored by the anchor (18); a sealing ring (19) is provided between the upper mounting plate (8) and the anchor (18) and around the prestressed tendon (14); the adjustable ring (10) includes an arc plate (10.1) and a connecting bolt (10.2); there are two arc plates (10.1), which are respectively provided on both sides of the test pile (1); ear plates (10.1.1) are respectively provided on both sides of each arc plate (10.1); the connecting bolt (10.2) There are two groups, respectively connect the ear plates (10.1.1) on one side of the two arc plates (10.1); on the ear plates (. 10.1.1) A horizontal panel (10.3) is provided on the top for a displacement meter (11) to measure the displacement; the displacement meter (11) is in contact with the horizontal panel (10.3).

2. The anchor pile and beam reaction force device suitable for high-altitude static load testing according to claim 1 is characterized in that: The vertical section of the connecting beam (12) is in an I-shape, and steel vertical ribs (13) are provided at intervals along the longitudinal direction on both sides of the web of the connecting beam (12) and between the upper and lower flange plates.

3. The anchor pile and beam reaction force device suitable for high-altitude static load testing according to claim 1 is characterized in that: The first anchor member (6) comprises a first tie rod (6.1), a first upper anchor plate (6.2) and a first lower anchor plate (6.3); the first upper anchor plate (6.2) is vertically placed on the upper surface of the secondary beam (4), and the first lower anchor plate (6.3) is vertically arranged on the bottom of the connecting beam (12); holes are respectively provided on the connecting beam (12) and the secondary beam (4) at positions corresponding to the first tie rod (6.1); through holes are respectively provided on the first upper anchor plate (6.2) and the first lower anchor plate (6.3) at positions corresponding to the holes; the first tie rod (6.1) passes through the hole and the through hole and is fastened with high-strength bolts.

4. The anchor pile and beam reaction force device suitable for high-altitude static load testing according to claim 1 is characterized in that: A group of the second anchors (7) are arranged at equal intervals on each side of the test pile (1), and the second anchors (7) on both sides of the test pile (1) are arranged symmetrically with respect to the test pile (1); the second anchors (7) include a second tie rod (7.1), a second upper anchor plate (7.2) and a second lower anchor plate (7.3); the second upper anchor plate (7.2) is vertically placed on the end of the upper surface of the main beam (3), and the second lower anchor plate (7.3) is vertically arranged on the bottom of the secondary beam (4); circular holes are respectively provided on the main beam (3) and the secondary beam (4) at positions corresponding to the second tie rods (7.1); through holes are respectively provided on the second upper anchor plate (7.2) and the second lower anchor plate (7.3) at positions corresponding to the circular holes; the second tie rod (7.1) passes through the circular hole and the through hole and is fastened with high-strength bolts.

5. A test method for the anchor pile and beam reaction device for static load test according to any one of claims 1 to 4, characterized in that: The steps are as follows: Step 1: making a steel cylinder (9) and longitudinally passing a connecting beam (12) through the steel cylinder (9); Step 2: Prefabricate anchor piles (2). The specific method is as follows: Step 1, when tying the steel cage of the anchor pile (2), Step 2: pre-install a lower mounting plate (16) near the lower end of the anchor pile (2), and install an upper mounting plate (8) at the top of the anchor pile (2); then install a sleeve (17) between the upper mounting plate (8) and the lower mounting plate (16); Step 3, inserting a prestressed tendon (14) into the sleeve (17), and anchoring the lower end of the prestressed tendon (14) to the bottom of the lower mounting plate (16); Step 4, supporting the formwork and pouring concrete for the anchor pile (2); Step 5: When the concrete strength reaches the design strength, the upper end of the prestressed tendon (14) is tensioned and anchored to the top of the upper mounting plate (8); Step 6, connect the steel cylinder (9) to the top of the upper mounting plate (8); Step 3: construct anchor piles (2) at intervals on both sides of the test pile (1); Step 4, constructing the secondary beam (4): hoisting the two secondary beams above the steel cylinders (9) on top of the two groups of anchor piles (2), and using the first tie member (6) to tie the secondary beam (4) to the connecting beam (12); Step 5, constructing the main beam (3): hoisting the main beam (3) above the jack (5) on the top of the test pile (1), and using the second anchor (7) to tie the main beam (3) and the secondary beam (4); Step 6: Install an adjustable collar (10) at the bottom of the test pile (1); provide displacement meters (11) on both sides of the adjustable collar (10); support the displacement meter (11) on the ground and detachably connect it to the adjustable collar (10); Step seven, using the jack (5) to push the main beam (3) upward, the generated reaction force reacts to the compression of the test pile (1), causing the test pile (1) to sink; Step eight, after the test pile (1) sinks and stabilizes, the reading on the displacement meter (11) is collected, and the settlement value of the test pile (1) under the specific load is obtained.

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