A pile foundation static load test self-adaptive modular anchor pile steel bar connecting device and method

Abstract

This invention belongs to the technical field of pile foundation testing, specifically an adaptive modular anchor pile reinforcement connection device and method for static load testing of pile foundations. The device mainly includes an anchor pile, a connection mechanism threaded through the anchor pile reinforcement, a tie rod for connecting the secondary beam and the connection mechanism, and a support rod for fixing the tie rod. The connection mechanism includes modular components, a connecting beam, a constraint mechanism, and a support component. This device solves the problem of traditional anchor piles being connected to the loading device via welded reinforcement bars or a platform with fixed holes. This device not only enables rapid connection between the anchor pile and the loading device but also allows for rapid connection of anchor piles with different diameters and reinforcement spacings, ensuring uniform stress distribution across all anchor pile reinforcements during loading and avoiding the problem of incomplete connection of some anchor pile reinforcements due to improper anchor pile reinforcement construction.

Description

Technical Field

[0001] This invention relates to the field of pile foundation testing technology, and in particular to an adaptive modular anchor pile reinforcement connection device and method for static load testing of pile foundations. Background Technology

[0002] Pile foundations are an effective way to improve the bearing capacity of the soil. After the pile foundation construction is completed, it is necessary to test the vertical bearing capacity of the pile foundation to see if it meets the design requirements. Common methods for testing the vertical bearing capacity of pile foundations include the surcharge method, the high-strain method, and the anchor pile method. The surcharge method and the anchor pile method are the most widely used. The surcharge method requires a large number of counterweights as loads. For situations with complex site conditions or where counterweights cannot be transported to the test site, the surcharge method is not applicable. In such cases, the anchor pile method is generally used for static load testing. The anchor pile method uses the already constructed pile foundation (i.e., anchor piles) as the load carrier. By connecting the anchor piles to the loading device, it provides the reaction force for the static load test, thus achieving the loading purpose.

[0003] The connection between the anchor pile and the experimental device is the key to the implementation of the test. Currently, the commonly used anchor pile connection methods are mainly welding and steel plate connection. Conventional connection methods have the following shortcomings: (1) The welding method involves welding the reinforcing bars on the anchor pile to extend it and connect it to the secondary beam of the experimental device. This method requires high technical skills from the welder. If the welding is not firm, it is easy to break open and cause safety accidents. Moreover, the welding time is long, which affects the time of the static load test of the pile foundation. (2) The steel plate method uses a steel plate with holes drilled as a bridge to connect the anchor pile reinforcing bars and the static load test device. Since the spacing of the reinforcing bars in the cast-in-place pile reinforcing cage is not strictly arranged according to the equal spacing during the manufacturing process, some reinforcing bars cannot pass through the holes in the steel plate smoothly, which will result in uneven stress during the static load test of the anchor pile, ultimately leading to inaccurate test results. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an adaptive modular anchor pile reinforcement connection device and method for static load testing of pile foundations. This method can effectively solve the problem of difficulty in connecting anchor pile reinforcement to the testing device due to uneven distribution of anchor pile reinforcement spacing. Moreover, the device is simple to operate, convenient and quick, and has high testing accuracy.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] According to one aspect of the present invention, an adaptive modular anchor pile reinforcement connection device for static load testing of pile foundation is provided, comprising a connection mechanism that can be inserted into the anchor pile reinforcement, a tie rod and a support rod for connecting a secondary beam and the connection mechanism, wherein the connection mechanism comprises a modular component, a connecting beam, a constraint mechanism, and a support component;

[0007] The support assembly is disposed around the anchor pile, and the connecting beam is erected on the support assembly and can be leveled through the support assembly;

[0008] The module component is fixed to the connecting beam by the constraint mechanism. The installation position of the module component on the connecting beam is adjustable. The anchor pile reinforcement is fixed to the module component by the anchor.

[0009] Furthermore, the support assembly includes a slot, an outer sleeve, a threaded rod, and a grounding rod;

[0010] The grounding rod is located at the bottom of the threaded rod, the outer sleeve is sleeved on the threaded rod and threadedly engaged with the threaded rod, the slot is located at the top of the outer sleeve to support the connecting beam, and a laser component, a switch, and a target plate are installed at the slot.

[0011] Furthermore, a fixed ball is provided at the upper end of the outer sleeve, and a constraint shell is provided at the bottom of the slot. The fixed ball passes through the constraint shell and can rotate within the constraint shell.

[0012] The constraint shell is a spherical shell with a circular hole at its lower part. The diameter of the fixed ball is larger than the diameter of the circular hole, and the diameter of the outer sleeve is smaller than the diameter of the circular hole.

[0013] Furthermore, the laser component is mounted on the outer wall of one end of the slot and is located at the center of the side wall, and the target disk is mounted on the outer wall of the other end of the slot and is located at the center of the side wall.

[0014] Furthermore, leveling bubbles are provided on the connecting beam;

[0015] Two connecting beams are provided, respectively arranged on both sides of the anchor pile, and each connecting beam is supported at both ends by a support component.

[0016] Furthermore, the connecting beam has connecting holes at both ends for connecting tie rods, and a through-type elongated fixing groove is provided on the upper and lower surfaces of the connecting beam; the two ends of the multiple module components are respectively installed at the fixing groove of the corresponding connecting beam through a constraint mechanism.

[0017] Furthermore, the module component includes a steel plate, several spacers and bolts. The spacers are clamped between two steel plates and fastened by bolts. The spacers are symmetrically arranged on both sides of the steel plates. The anchor pile reinforcement passes through the gap between the two steel plates and is fixed by the anchor. The size of the gap between the steel plates can be adjusted by adjusting the number of spacers to accommodate the diameter of the anchor pile reinforcement.

[0018] Furthermore, the constraint mechanism includes a fixed sleeve, a locking pin, a limiting plate, and a wing nut;

[0019] The locking post can be freely inserted into the fixing sleeve. The locking post is located on the upper part of the module assembly, and the limiting plate is located on the lower part of the connecting beam. The module assembly and the connecting beam are pressed and fixed by the wing nut.

[0020] Furthermore, the secondary beam consists of two beams arranged at a certain distance, with a connecting mechanism connected to both ends of each secondary beam. The two secondary beams act on the main beam, which is connected to the test pile via jacks.

[0021] According to another aspect of the present invention, a method utilizing the above-described apparatus is provided, comprising the following steps:

[0022] S1. Install two support components on the same side of the anchor pile according to the height of the anchor pile head, and set up the connecting beam on the support components. Adjust the outer sleeve on one of the support components according to the leveling bubble status on the connecting beam so that the leveling bubble on the connecting beam is centered.

[0023] S2. Open the laser components on the two fixed support components. On the other side of the anchor pile, symmetrically arrange two other support components with the anchor pile center as the center, so that the side with the target plate is aligned with the laser component. By adjusting the horizontal position and vertical height of the support components, the beam emitted by the corresponding laser component hits the center of the target plate. Then, set up the connecting beam on another adjusted support component.

[0024] S3. Assemble several modular components according to the diameter of the anchor pile reinforcement. Place the modular components in the same direction, with two reinforcement bars as a group, on the anchor pile reinforcement. The two ends of the modular components are fixed to the connecting beam by the constraint mechanism. The reinforcement bars on the anchor pile are fixed to the modular components by the anchor.

[0025] S4. Connect the connecting mechanism to the secondary beam via tie rods and support rods. The secondary beam acts on the main beam. The main beam is connected to the test pile by jacks to conduct a test pile loading test.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] (1) The device adopts an adaptive modular structure design, which is versatile and can be adapted to static load testing of pile foundations of any type of pile. In any case where the distribution of anchor pile reinforcement is uneven, the reinforcement can be connected to the loading test device through the modular components of the device.

[0028] (2) The device is designed with a connecting beam with a fixing groove. The module components can be connected to the connecting beam at any angle. The device is also designed with a constraint mechanism to fix the module components on the connecting beam.

[0029] (3) The device is designed with a support component and a laser centering device, which greatly facilitates the fixing of the connecting beam. The flatness of the connecting beam is the key to the stress balance of the anchor pile reinforcement. Only when the connecting beam is in a horizontal state can the stress points of the anchor pile reinforcement be on the same horizontal plane, so as to achieve the balanced stress of the anchor pile. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 A simplified implementation diagram of the adaptive modular anchor pile rebar connection device provided by the present invention;

[0032] Figure 2 This is a schematic diagram of the connection mechanism provided by the present invention;

[0033] Figure 3 A schematic diagram of the module components provided by this invention;

[0034] Figure 4 This is a schematic diagram of the connecting beam structure provided by the present invention;

[0035] Figure 5 A schematic diagram of the constraint mechanism provided by the present invention;

[0036] Figure 6 A schematic diagram of the support component structure provided by the present invention;

[0037] Figure 7 A cross-sectional view of the support component structure provided by the present invention;

[0038] Figure 8 This is a schematic diagram of the target disk position at the slot provided by the present invention.

[0039] In the picture:

[0040] 1-Test pile, 2-Jack, 3-Anchor pile, 310-Anchor pile reinforcement, 320-Anchorage;

[0041] 4-Pull rod, 410-First nut, 420-Second nut;

[0042] 5-Connecting mechanism, 510-Module component, 511-Steel plate, 512-Padded block, 513-Bolt, 520-Connecting beam, 521-Fixing groove, 522-Leveling bubble, 523-Connecting hole, 530-Constraint mechanism, 531-Fixing sleeve, 532-Clamping post, 533-Limiting plate, 534-Wing nut, 540-Support component, 541-Clamping groove, 5411-Laser component, 5412-Switch, 5413-Target disk, 542-Constraint shell, 543-Fixing ball, 544-Outer sleeve, 545-Threaded rod, 546-Ground rod

[0043] 6-Secondary beam, 7-Main beam, 8-Supporting rod. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0049] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0051] refer to Figures 1-8 The diagram shown is a schematic diagram of the relevant structure of an adaptive modular anchor pile reinforcement connection device for static load testing of pile foundation in this embodiment.

[0052] This device mainly includes anchor piles 3, a connecting mechanism 5 that passes through the anchor pile reinforcement 310, a tie rod 4 for connecting the secondary beam 6 and the connecting mechanism 5, and a support rod 8 for fixing the tie rod 4.

[0053] As shown in the figure, two secondary beams 6 are arranged side by side and supported by a main beam 7 at the middle position below the two secondary beams 6. Each of the two secondary beams 6 has an anchor pile 3 at its lower end. A connecting mechanism 5 is installed on the anchor pile 3. The connecting mechanism 5 is connected to the secondary beams 6 through four tie rods 4, two support rods 8 and a second nut 420. The secondary beams 6 act on the main beam 7. The main beam 7 is connected to the test pile 1 through a jack 2, thereby achieving the purpose of static load test loading.

[0054] In this embodiment, the connecting mechanism 5 mainly includes a module component 510, a connecting beam 520, a constraint mechanism 530, and a support component 540.

[0055] In a preferred embodiment, the module component 510 mainly consists of two steel plates 511, several spacers 512, and bolts 513. The spacers 512 are symmetrically arranged at both ends of the steel plates 511, and are used to adjust the spacing between the two steel plates 511. The number of spacers is selected according to the diameter of the anchor pile reinforcement 310. The anchor pile reinforcement 310 passes through the gap between the two steel plates 511 and is then fixed by anchors 320 to connect the anchor pile reinforcement 310 to the module component 510. It is evident that this module component 510 is suitable for connecting reinforcement within the range required by any pile foundation specification.

[0056] In this embodiment, the module component 510 is fixed to the connecting beam 520 by a constraint mechanism 530, and the connecting beam 520 is mounted on the support component 540. Specifically, connecting holes 523 are provided at both ends of the connecting beam 520, and the connecting beam 520 is connected to the tie rod 4 through the connecting holes 523 and the first nut 410. Through-hole fixing grooves 521 are provided on the upper and lower parts of the connecting beam 520. The fixing grooves 521 are elongated structures to facilitate easy adjustment of the installation position of the module component 510. Obviously, the structural design of the fixing grooves 521 ensures that the module component 510 is not restricted by the hole positions on the connecting beam 520, and that the uneven spacing of the anchor pile reinforcement 310 does not prevent some reinforcement bars from being unable to connect. This device design allows two corresponding reinforcement bars at any angle within the deviation range to be connected to the connecting beam 520.

[0057] In this embodiment, the constraint mechanism 530 mainly includes a fixed sleeve 531, a locking post 532, a limiting plate 533, and a wing nut 534. The wing nut 534 is used to press the limiting plate 533. The constraint mechanism 530 can connect the connecting beam 520 and the module assembly 510 together. In use, the locking post 532 is positioned on the upper surface of the module assembly 510, and the limiting plate 533 is positioned on the lower surface of the connecting beam 520. The module assembly 510 is fixed to the connecting beam 520 by tightening the wing nut 534. It should be noted that the locking post 532 can be freely inserted into the fixed sleeve 531, and a suitable length of locking post 532 can be selected according to the width of the module assembly 510. The design of the constraint mechanism 530 makes this device more convenient to use.

[0058] In this embodiment, the support assembly 540 is one of the key factors for the device to achieve precise connection with static load testing. The support assembly 540 mainly includes a slot 541, an outer sleeve 544, a threaded rod 545, and a grounding rod 546. A laser assembly 5411, a switch 5412, and a target plate 5413 are installed on the slot 541.

[0059] A fixed ball 543 is fixedly connected to the upper end of the outer sleeve 544. The fixed ball 543 passes through the constraint shell 542, which is fixed to the bottom of the slot 541. Obviously, the fixed ball 543 can rotate inside the constraint shell 542. It should be noted that the constraint shell 542 is a spherical shell with a circular hole at its lower part. The diameter of the fixed ball 543 is larger than the diameter of the circular hole in the constraint shell 542, and the diameter of the outer sleeve 544 is slightly smaller than the diameter of the circular hole in the constraint shell 542. The outer sleeve 544 can rotate freely inside the constraint shell 542.

[0060] In this embodiment, the support component 540 is used in conjunction with the connecting beam 520. A leveling bubble 522 is installed on the side wall of the connecting beam 520. The support component 540 and the connecting beam 520 on one side of the anchor pile are adjusted according to the height of the anchor pile 3. Then, the support component 540 and the connecting beam 520 on the other side of the anchor pile 3 are fixed by the laser component 5411 and the target plate 5413 on the support component 540. The laser component 5411 is installed on the outer wall of one end of the slot 541 and is located at the center of the side wall. The target plate 5413 is installed on the outer wall of the other end of the slot 541 and is located at the center of the side wall.

[0061] In the device provided in this embodiment, all the reinforcing bars of the anchor pile 3 can be connected to the static load test loading device, and all the stress points of the reinforcing bars of the anchor pile 3 are on the same plane.

[0062] The above embodiments describe in detail an adaptive modular anchor pile reinforcement connection device for static load testing of pile foundations according to this application. This embodiment also provides a method for implementing the above device, specifically including the following steps: S1. Based on the height of the anchor pile 3, install two support components 540 on the same side of the anchor pile. Erect the connecting beam 520 on the support components 540. Adjust the outer sleeve 544 on one of the support components 540 according to the state of the leveling bubble 522 on the connecting beam 520 so that the leveling bubble 522 on the connecting beam 520 is in the center position. Obviously, during the rotation of the outer sleeve 544, the fixed ball 543 rotates with the bottom contact point of the slot 541 as the fulcrum, while the slot 541 remains fixed. The fixed ball 543 can rotate inside the constraint shell 542 but cannot be pulled out from the constraint shell 542. S2. Open the laser component 5411 on the two fixed support components 540. On the other side of the anchor pile 3, with the center of the anchor pile 3 as the center, arrange two other support components 540 symmetrically, so that the side with the target plate 5413 is aligned with the laser component 5411. By adjusting the horizontal position and vertical height of the support components 540, the beam emitted by the corresponding laser component 5411 hits the center of the target plate 5413. Then, set up the connecting beam 520 on another adjusted support component 540. S3. Assemble several modular components 510 according to the diameter of the reinforcing bars. Place the modular components 510 in the same direction, with two reinforcing bars as a group, on the reinforcing bars of the anchor pile 3. The two ends of the modular components 510 are fixed to the connecting beam 520 by the constraint mechanism 530. The reinforcing bars on the anchor pile 3 are fixed to the modular components 510 by the anchor 320. S4. The connecting mechanism 5 is connected to the secondary beam 6 through the tie rod 4 and the support rod 8. The secondary beam 6 acts on the main beam 7. The main beam 7 is connected to the test pile 1 by the jack 2 to carry out the static load test of the test pile.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adaptive modular anchor pile reinforcement connection device for static load testing of pile foundation, comprising a connection mechanism that can be inserted into the anchor pile reinforcement, a tie rod and a support rod for connecting a secondary beam and the connection mechanism, characterized in that, The connection mechanism includes modular components, connecting beams, constraint mechanisms, and support components; The support assembly is disposed around the anchor pile, and the connecting beam is erected on the support assembly and can be leveled through the support assembly; The module component is fixed to the connecting beam by the constraint mechanism. The installation position of the module component on the connecting beam is adjustable. The anchor pile reinforcement is fixed to the module component by the anchor.

2. The adaptive modular anchor pile reinforcement connection device for static load testing of pile foundations according to claim 1, characterized in that, The support assembly includes a slot, an outer sleeve, a threaded rod, and a grounding rod; The grounding rod is located at the bottom of the threaded rod, the outer sleeve is sleeved on the threaded rod and threadedly engaged with the threaded rod, the slot is located at the top of the outer sleeve to support the connecting beam, and a laser component, a switch, and a target plate are installed at the slot.

3. The adaptive modular anchor pile reinforcement connection device for static load testing of pile foundations according to claim 2, characterized in that, A fixed ball is provided at the upper end of the outer sleeve, and a constraint shell is provided at the bottom of the slot. The fixed ball passes through the constraint shell and can rotate within the constraint shell. The constraint shell is a spherical shell with a circular hole at its lower part. The diameter of the fixed ball is larger than the diameter of the circular hole, and the diameter of the outer sleeve is smaller than the diameter of the circular hole.

4. The adaptive modular anchor pile reinforcement connection device for static load testing of pile foundations according to claim 3, characterized in that, The laser component is mounted on the outer wall of one end of the slot and is located at the center of the side wall. The target disk is mounted on the outer wall of the other end of the slot and is located at the center of the side wall.

5. The adaptive modular anchor pile reinforcement connection device for static load testing of pile foundations according to claim 4, characterized in that, The connecting beam is equipped with leveling bubbles; Two connecting beams are provided, respectively arranged on both sides of the anchor pile, and each connecting beam is supported at both ends by a support component.

6. The adaptive modular anchor pile reinforcement connection device for static load testing of pile foundations according to claim 1, characterized in that, The connecting beam has connecting holes at both ends for connecting tie rods, and a through-type long strip fixing groove is provided on the upper and lower surfaces of the connecting beam; the two ends of the multiple module components are respectively installed at the fixing groove of the corresponding connecting beam through a constraint mechanism.

7. The adaptive modular anchor pile reinforcement connection device for static load testing of pile foundations according to claim 1, characterized in that, The module component includes a steel plate, several spacers and bolts. The spacers are clamped between two steel plates and fastened by bolts. The spacers are symmetrically arranged on both sides of the steel plates. The anchor pile reinforcement passes through the gap between the two steel plates and is fixed by the anchor. The size of the gap between the steel plates can be adjusted by adjusting the number of spacers to accommodate the diameter of the anchor pile reinforcement.

8. The adaptive modular anchor pile reinforcement connection device for static load testing of pile foundations according to claim 1, characterized in that, The constraint mechanism includes a fixed sleeve, a locking pin, a limiting plate, and a wing nut; The locking post can be freely inserted into the fixing sleeve. The locking post is located on the upper part of the module assembly, and the limiting plate is located on the lower part of the connecting beam. The module assembly and the connecting beam are pressed and fixed by the wing nut.

9. The adaptive modular anchor pile reinforcement connection device for static load testing of pile foundations according to claim 1, characterized in that, The secondary beam consists of two beams arranged at a certain distance, with a connecting mechanism connected to each end of each secondary beam. The two secondary beams act on the main beam, which is connected to the test pile via jacks.

10. A method using the apparatus as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Install two support components on the same side of the anchor pile according to the height of the anchor pile head, and set up the connecting beam on the support components. Adjust the outer sleeve on one of the support components according to the leveling bubble status on the connecting beam so that the leveling bubble on the connecting beam is centered. S2. Open the laser components on the two fixed support components. On the other side of the anchor pile, symmetrically arrange two other support components with the anchor pile center as the center, so that the side with the target plate is aligned with the laser component. By adjusting the horizontal position and vertical height of the support components, the beam emitted by the corresponding laser component hits the center of the target plate. Then, set up the connecting beam on another adjusted support component. S3. Assemble several modular components according to the diameter of the anchor pile reinforcement. Place the modular components in the same direction, with two reinforcement bars as a group, on the anchor pile reinforcement. The two ends of the modular components are fixed to the connecting beam by the constraint mechanism. The reinforcement bars on the anchor pile are fixed to the modular components by the anchor. S4. Connect the connecting mechanism to the secondary beam via tie rods and support rods. The secondary beam acts on the main beam. The main beam is connected to the test pile by jacks to conduct a test pile loading test.

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