Connecting device for cast-in-place pile uplift static load test

Abstract

The utility model belongs to the field of foundation detection, and particularly relates to a connecting device for a cast-in-place pile uplift static load test, which comprises a disc main body arranged at the top of a cast-in-place pile, the disc main body is connected with all steel bars exposed out of the top of the cast-in-place pile, and openings are formed in the periphery of the disc main body at equal intervals. Each opening extends in the radial direction of the disc body, arc-shaped grooves are formed in the two sides of each opening, at least one small groove is formed in the two sides of each arc-shaped groove, the steel bars are sleeved with the buckling mechanisms, the buckling mechanisms abut against the disc body, and the bottoms of the buckling mechanisms make contact with the upper surface of the disc body. By means of the opening, the arc-shaped groove and the small groove formed in the disc body, more penetrating space can be provided for reinforcing steel bars on the cast-in-place pile, a tester can adjust the reinforcing steel bars at different intervals on the cast-in-place pile in real time according to site conditions on site so that the reinforcing steel bars can penetrate through the disc body, the accuracy of an anti-pulling experiment is improved, and the testing efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of foundation inspection, and particularly relates to a connecting device for the anti-pulling static load test of cast-in-place piles. Background Technique

[0002] The inspection of test piles is a necessary work before the construction of engineering piles, which can provide pile foundation design parameters for design. And the inspection of engineering piles is a necessary procedure to ensure the quality of engineering piles. By means of sampling inspection, the understanding of engineering piles can be improved, and the engineering quality can be ensured. Therefore, the anti-pulling test, as an important part of the static load test, has become a necessary means to provide design parameters and ensure the engineering quality. And the anti-pulling test of cast-in-place piles plays a very important role in the anti-pulling static load test.

[0003] There are usually two methods to connect the steel bars of cast-in-place piles with the anti-pulling device in the existing anti-pulling tests of cast-in-place piles: 1. By welding; 2. By buckle. The existing welding method usually has the problem that welding is easy but cutting is difficult. And in the existing buckle method, the buckle is used to connect the disc and the steel bar, so that the steel bar can bear the uplift force. However, in actual operation, the distance between steel bars sometimes changes. As a prefabricated device, the disc cannot make the steel bar connect to the disc straightly. The accuracy of the anti-pulling test data measured when the steel bar is bent needs to be improved, and the existing equipment may cause damage caused by the twisting of the steel bar back and forth. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the utility model provides a connecting device for the anti-pulling static load test of cast-in-place piles. Through the openings, arc-shaped grooves and small grooves arranged on the disc body, steel bars with different distances on the cast-in-place piles can penetrate the disc body, improving the accuracy of the anti-pulling test.

[0005] To achieve the above object, the utility model is realized through the following technical solutions:

[0006] A connecting device for the anti-pulling static load test of cast-in-place piles, including a disc body installed on the top of the cast-in-place pile. The disc body is connected to all the steel bars exposed on the top of the cast-in-place pile. Openings are arranged at equal intervals on the outer periphery of the disc body. Each opening extends along the radial direction of the disc body. Arc-shaped grooves are arranged on both sides of each opening. At least one small groove is arranged on both sides of each arc-shaped groove. The connecting device further includes a buckle mechanism sleeved on the steel bar and abutting against the disc body. The bottom of the buckle mechanism is in contact with the upper surface of the disc body.

[0007] Preferably, the buckle mechanism includes two relatively arranged fixing parts. A semi-circular through hole is arranged inside the fixing part. Reinforcing ribs are arranged on both sides of the fixing part. A number of threaded holes are arranged on the reinforcing ribs.

[0008] Preferably, the through hole is a semi-cylindrical structure with a gradually decreasing diameter.

[0009] Preferably, two opposite fixing members are fixedly installed on the top steel bars of the cast-in-place pile through bolts.

[0010] Preferably, the opening is perpendicular to the arc-shaped groove, the arc-shaped groove is perpendicular to the small groove, and expansion ports that expand to both sides are provided at both ends of all the small grooves.

[0011] Preferably, a force transmission column is provided at the center of the disc body.

[0012] Preferably, the disc body is cast from integrally formed steel material.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: Through the openings, arc-shaped grooves and small grooves provided on the disc body, more penetration spaces can be provided for the steel bars on the cast-in-place pile, and the testers can make real-time adjustments according to the on-site situation, so that the steel bars with different spacings on the cast-in-place pile can all penetrate the disc body, improving the accuracy of the uplift test.

[0014] The fixing member can quickly lock and release the steel bar through bolts, which is convenient for installation and disassembly and improves the test efficiency.

[0015] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic three-dimensional installation structure diagram of a connecting device for the uplift static load test of a cast-in-place pile.

[0017] Figure 2 FIG. is a sectional view of the installation of a connecting device for the uplift static load test of a cast-in-place pile.

[0018] Figure 3 FIG. is a schematic three-dimensional structure diagram of a connecting device for the uplift static load test of a cast-in-place pile.

[0019] Figure 4 FIG. is a top view of a connecting device for the uplift static load test of a cast-in-place pile.

[0020] Figure 5 FIG. is a schematic three-dimensional structure diagram of the buckle mechanism of a connecting device for the uplift static load test of a cast-in-place pile.

[0021] Figure 6 FIG. is an exploded view of the three-dimensional structure of the buckle mechanism of a connecting device for the uplift static load test of a cast-in-place pile.

[0022] In the figure: 1. Disc main body; 2. Steel bar; 3. Opening; 4. Arc-shaped groove; 5. Small groove; 6. Buckling mechanism; 61. Fixing part; 62. Through hole; 63. Reinforcing rib; 7. Force transmission column; 8. Expansion port. Detailed implementation mode

[0023] The following combines the drawings and embodiments to make a specific and detailed description of the implementation mode of the present utility model. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present utility model.

[0024] Combined with Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in the figure, a connecting device for the anti-pulling static load test of cast-in-place piles includes a disc main body 1 installed on the top of the cast-in-place pile. The disc main body 1 is connected to all the steel bars 2 exposed on the top of the cast-in-place pile. A plurality of openings 3 are arranged at equal intervals on the outer circumference of the disc main body 1. Each opening 3 extends along the radial direction of the disc main body 1. Arc-shaped grooves 4 are arranged on both sides of each opening 3. At least one small groove 5 is arranged on both sides of each arc-shaped groove 4. A buckling mechanism 6 sleeved on the steel bar 2 and abutting against the disc main body 1 is further included. The bottom of the buckling mechanism 6 is in contact with the upper surface of the disc main body 1.

[0025] Specifically, a connecting device for the anti-pulling static load test of cast-in-place piles of the present utility model ensures that the top of the cast-in-place pile can be stably and reliably connected to the test equipment during the anti-pulling test, so as to accurately evaluate the bearing capacity of the pile. The connecting device mainly includes a disc main body 1, which is installed on the top of the cast-in-place pile and above the steel bars 2 exposed on the top of the cast-in-place pile. The disc main body 1 is made of high-strength and corrosion-resistant materials to ensure its stability and durability in the long-term outdoor environment and high-load tests.

[0026] The diameter and thickness of the disc main body 1 are customized according to the size of the cast-in-place pile and the expected load requirements to ensure sufficient connection strength and sufficient stress dispersion. A plurality of equally spaced openings 3 are evenly distributed on the outer circumference of the disc main body 1 along the center direction. Arc-shaped grooves 4 are arranged on both sides of each opening 3. The arrangement of these arc-shaped grooves 4 enables the steel bars 2 on the cast-in-place pile to have more penetration space, so that the steel bars 2 with different spacings can pass through the disc main body 1 and be fixed.

[0027] Furthermore, small grooves 5 are additionally arranged on both sides of all the arc-shaped grooves 4. These small grooves 5, as auxiliary structures, can provide more sufficient penetration space for the steel bars 2 with different spacings and increase the stability and safety of the connection.

[0028] Each steel bar 2 is sleeved with a buckle mechanism 6. These buckle mechanisms 6 are made of high-strength alloy, have excellent elasticity and wear resistance, can adapt to steel bars 2 of different diameters and ensure a tight fit. The bottom of the buckle mechanism 6 is designed with a contact surface matching the upper surface of the disc body 1 to ensure that the pressure can be evenly distributed during connection and avoid damage caused by local stress concentration.

[0029] Through the comprehensive design of the disc body 1, the opening 3, the arc-shaped groove 4, the small groove 5 and the buckle mechanism 6, an efficient, stable and safe connection is achieved, providing a solid technical support for accurately evaluating the uplift performance of cast-in-place piles.

[0030] Combined Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, the buckle mechanism 6 includes two relatively arranged fixing parts 61. A semi-circular through hole 62 is arranged inside the fixing part 61. Reinforcing ribs 63 are arranged on both sides of the fixing part 61, and a number of threaded holes 64 are arranged on the reinforcing ribs 63. Combined Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, the two relatively arranged fixing parts 61 are fixedly installed on the top steel bar 2 of the cast-in-place pile by bolts.

[0031] Specifically, the buckle mechanism 6 ensures a stable and reliable connection in the static uplift load test of the cast-in-place pile. The buckle mechanism 6 is mainly composed of two relatively arranged fixing parts 61. These two fixing parts 61 are made of high-strength and corrosion-resistant alloy materials to adapt to the extreme loads and environmental conditions that may occur during the test. The shape and size of the fixing parts 61 are designed to ensure that they can closely fit around the top steel bar 2 of the cast-in-place pile, and at the same time provide sufficient strength and stiffness to resist tensile and shear forces.

[0032] A semi-circular through hole 62 is arranged inside each fixing part 61. When the two semi-circular through holes 62 are relatively installed on the fixing parts 61, they will jointly form a complete circular hole for accommodating and clamping the top steel bar 2 of the cast-in-place pile. The diameter of the through hole 62 is designed as a gradually decreasing cylindrical structure, which helps to achieve a tighter fit and higher connection strength by gradually tightening when the fixing part 61 is installed on the steel bar. It can also compensate for the slight differences in the diameter of the steel bar to a certain extent and improve the flexibility and adaptability of the installation.

[0033] To enhance the structural strength and stability of the fixing member 61, reinforcing ribs 63 are provided on both of its sides. These reinforcing ribs 63 not only increase the rigidity of the fixing member 61 but also provide additional support to prevent deformation or damage due to excessive stress during the test. The reinforcing ribs 63 ensure that while providing sufficient strength, they do not overly increase the weight and complexity of the fixing member 61. On the reinforcing ribs 63, a number of threaded holes 64 are provided. These threaded holes 64 are used to install bolts so as to tightly fix two opposite fixing members 61 together and mount them on the top steel bars 2 of the cast-in-place pile. The positions and quantities of the threaded holes 64 are carefully planned to ensure that the bolts can be evenly distributed and effectively transfer the load, while avoiding damage caused by local stress concentration.

[0034] During the installation process, first, the two fixing members 61 are respectively placed on both sides of the top steel bars 2 of the cast-in-place pile, and it is ensured that their semi-circular through holes 62 are aligned with the steel bars. Then, the two fixing members 61 are fixed together by bolts and nuts, and at the same time, the steel bars are clamped by using the gradually decreasing structure of the through holes 62. Finally, by tightening the bolts, a firm connection between the buckle mechanism 6 and the steel bars is ensured, providing a stable foundation for the subsequent static pull-out test.

[0035] Combined Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the opening 3 is perpendicular to the arc-shaped groove 4, the arc-shaped groove 4 is perpendicular to the small groove 5, and expansion openings 8 that expand towards both sides are provided at both ends of all the small grooves 5.

[0036] Specifically, the opening 3 being perpendicular to the arc-shaped groove 4 not only helps to enhance the structural strength of the disc body 1 but also ensures that during the connection process, the buckle mechanism 6 can smoothly enter and lock in the predetermined position. The existence of the opening 3 allows the buckle mechanism 6 to move and adjust within a certain range on the disc body 1 to adapt to the top steel bars 2 of cast-in-place piles with different diameters or shapes, thereby improving the flexibility and compatibility of the connection.

[0037] The design of the arc-shaped groove 4 being perpendicular to the small groove 5 takes more into account the connection stability and locking mechanism. The radian of the arc-shaped groove 4 matches the arrangement trend of the steel bars 2 of the cast-in-place pile, providing a smooth penetration path for the steel bars 2 to pass through the disc body 1 and ensuring that its buckle mechanism 6 can be locked on the upper surface of the disc body 1.

[0038] The setting of the small grooves 5 further enhances this locking effect. They provide additional penetration paths for the steel bars 2 to prevent some steel bars 2 from being unable to pass through the disc body 1 for fixation during the test installation process, resulting in a decrease in the test accuracy.

[0039] Both ends of all the small grooves 5 are provided with expansion openings 8 that expand towards both sides. The expansion openings 8 can accommodate the minor deformations of the steel bars 2 on the cast-in-place piles during installation and disassembly, thus simplifying the connection process and improving the operation efficiency. Secondly, the expansion openings 8 can also compensate to a certain extent for the dimensional changes caused by manufacturing tolerances or long-term use, ensuring that the connection device can continuously provide a stable and reliable connection. Finally, the existence of the expansion openings 8 also enhances the structural strength of the small grooves 5, enabling them to better withstand the pressure from the snap mechanism 6 and extending the service life of the connection device.

[0040] In practical applications, the combined action of the openings 3, the arc-shaped grooves 4, the small grooves 5, and the expansion openings 8 together constitutes an efficient, stable, and flexible connection system. It not only improves the adaptability and compatibility of the connection device to the steel bars 2 at the top of the cast-in-place piles but also ensures that during the uplift static load test, the connection device can provide reliable support and locking effects, thereby accurately evaluating the uplift performance of the cast-in-place piles.

[0041] Combined Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, a force transfer column 7 is provided at the center of the circle of the disc body 1.

[0042] Specifically, the disc body 1, as the core component of the connection device, is not only related to the structural stability and durability but also directly affects the accuracy and reliability of the uplift static load test of the cast-in-place piles. The force transfer column 7 is located at the center of the circle of the disc body 1 and effectively transfers and disperses the load from the test equipment during the uplift static load test. The force transfer column 7 is usually made of high-strength and corrosion-resistant materials such as stainless steel or alloy steel to ensure stability and durability under extreme load conditions. The shape and size of the force transfer column 7 are carefully calculated and designed to ensure that it can closely cooperate with the loading device of the test equipment to achieve accurate load transfer. Its top is usually designed as a flat surface or a threaded structure for easy connection and fixation with the loading device. At the same time, the bottom of the force transfer column 7 is tightly connected to the upper surface of the disc body 1 to form an integral structure, ensuring that the load can be evenly distributed onto the disc body 1 and then transferred to the steel bars 2 at the top of the cast-in-place piles.

[0043] Setting the force - transmitting column 7 on the disc main body 1 can effectively improve the overall stiffness and stability of the connecting device. In the uplift static load test, as the load increases, the disc main body 1 may be subjected to forces and deformations from all directions. The presence of the force - transmitting column 7 can act like a "prop" to support and stabilize the disc main body 1, preventing it from undergoing excessive deformation or instability. In addition, the force - transmitting column 7 can also play a role in adjusting and calibrating the load direction. In the test, sometimes due to errors in the testing equipment or the connecting device itself, the load direction may deviate. The design of the force - transmitting column 7 can ensure that the load is always transmitted along the predetermined direction, thus improving the accuracy and reliability of the test.

[0044] When conducting the uplift static load test of cast - in - place piles, the entire installation and testing process requires a high degree of precision and reliability to ensure the accuracy of the test results.

[0045] First of all, the preparatory work is crucial. Before the test starts, it is necessary to ensure that the disc main body 1 and its related components (such as the buckle mechanism 6, the force - transmitting column 7, etc.) are in good working condition without damage or wear. At the same time, it is also necessary to carefully check the steel bars 2 on the cast - in - place pile to ensure that their surfaces are clean, free of rust or damage to ensure good connection effects.

[0046] Next, hoist the disc main body 1. Use professional hoisting equipment to lift the disc main body 1 smoothly above the cast - in - place pile. During the hoisting process, it is necessary to ensure that the disc main body 1 remains horizontal to avoid tilting or shaking, so as not to affect the subsequent adjustment and fixation of the steel bars 2.

[0047] Then, adjust the verticality of the steel bars 2. According to the position of the opening 3 on the disc main body 1, gradually adjust the steel bars 2 on the cast - in - place pile so that they can be vertically placed at the arc - shaped groove 4 on the disc main body 1 or the small groove 5 inside the arc - shaped groove 4. This step requires extremely high precision because the verticality of the steel bars 2 will directly affect the accuracy of the test results. During the adjustment process, professional measuring tools (such as spirit levels, plumb bobs, etc.) can be used for real - time monitoring and correction.

[0048] When the steel bars 2 are adjusted to the predetermined position, next, fix the buckle mechanism 6. Place the buckle mechanism 6 at an appropriate position between the steel bars 2 and the disc main body 1 and tighten the bolts. During the process of tightening the bolts, it is necessary to ensure that the threads on the buckle mechanism 6 and the steel bars 2 can fit tightly and share the force together. The purpose of this step is to ensure a firm connection between the steel bars 2, the force - transmitting column 7, and the disc main body 1, preventing disengagement or loosening during the test. After completing the fixation of the buckle mechanism 6, the assembly work is then completed.

[0049] Next, the static pull-out test of the cast-in-place pile can be started. During the test, it is necessary to closely monitor the stress conditions of the disc body 1, the steel bar 2, and the buckle mechanism 6, and promptly discover and handle any abnormal situations.

[0050] After the test is completed, the disassembly work also needs to be carried out carefully. First, it is necessary to loosen the bolts on the buckle mechanism 6 to release the connection between the steel bar 2 and the disc body 1. Then, use the hoisting equipment to lift the disc body 1 smoothly off the cast-in-place pile to complete the disassembly work. During the disassembly process, it is also necessary to ensure that the disc body 1 remains horizontal to avoid tilting or shaking.

[0051] Combined with Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the disc body 1 is cast from integrally formed steel material.

[0052] Specifically, the reason for choosing integrally formed steel material for the disc body 1 is mainly that steel material is known for its high strength and good durability, and can withstand extreme loads and wear caused by long-term use. In the static pull-out test of the cast-in-place pile, the disc body 1 needs to bear huge loads from the testing equipment while maintaining the integrity and stability of the structure. Therefore, choosing steel material can ensure that the disc body 1 will not deform, crack or fail during the test.

[0053] Steel material has good plasticity and workability, and is suitable for various shapes of casting and processing. The integrally formed casting process can ensure the structural integrity and internal quality uniformity of the disc body 1, avoiding stress concentration and defects caused by welding or splicing.

[0054] In addition, through precise casting technology, the dimensional accuracy and surface finish of the disc body 1 can be ensured to meet the requirements of the test. During long-term use, the disc body 1 may be exposed to harsh environments such as moisture and corrosion. After proper treatment and protection, steel material can exhibit good corrosion resistance and wear resistance, extending the service life of the disc body 1.

[0055] The integrally formed casting process can also reduce production costs and improve production efficiency. Therefore, choosing steel material for manufacturing the disc body 1 can reduce the test cost while ensuring quality.

[0056] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A connecting device for the uplift static load test of cast-in-place piles, comprising a disc main body (1) installed on the top of the cast-in-place pile, and the disc main body (1) is connected to all the steel bars (2) exposed at the top of the cast-in-place pile, characterized in that, Each opening (3) on the outer periphery of the disc body (1) extends along the radial direction of the disc body (1). Arc-shaped grooves (4) are provided on both sides of each opening (3), and at least one small groove (5) is provided on both sides of each arc-shaped groove (4). It further includes a buckle mechanism (6) sleeved on the steel bar (2) and abutting against the disc body (1), and the bottom of the buckle mechanism (6) contacts the upper surface of the disc body (1).

2. The connecting device for the anti-pulling static load test of cast-in-place piles according to claim 1, characterized in that, The buckle mechanism (6) includes two fixing members (61) arranged oppositely. A semi-circular through hole (62) is provided inside the fixing member (61), reinforcing ribs (63) are provided on both sides of the fixing member (61), and a number of threaded holes (64) are provided on the reinforcing ribs (63).

3. The connecting device for the anti-pulling static load test of cast-in-place piles according to claim 2, characterized in that, The through hole (62) is a semi-cylindrical structure with a gradually decreasing diameter.

4. The connecting device for the anti-pulling static load test of cast-in-place piles according to claim 2, wherein, The two opposite fixing members (61) are fixedly installed on the top steel bar (2) of the cast-in-place pile by bolts.

5. The connecting device for the anti-pulling static load test of bored cast-in-place piles according to claim 1, characterized in that, The opening (3) is perpendicular to the arc-shaped groove (4), the arc-shaped groove (4) is perpendicular to the small groove (5), and expansion ports (8) expanding towards both sides are provided at both ends of all the small grooves (5).

6. A connecting device for the anti-pulling static load test of cast-in-place piles according to any one of claims 1-5, characterized in that, A force transmission column (7) is provided at the center of the disc body (1).

7. The connecting device for the anti-pulling static load test of cast-in-place piles according to claim 1, characterized in that, The disc body (1) is cast from a steel material formed integrally.

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