Precast concrete pile pull-out test connecting system based on self-locking snap ring and slip technology

Abstract

The utility model provides a precast concrete pile pull-out test connecting system based on a self-locking snap ring and slip technology. The precast concrete pile pull-out test connecting system comprises a supporting pier, a steel beam, a test pile and a self-locking structure. A concrete test pile is prefabricated on the ground, supporting blocks are arranged on the two sides of the test pile respectively, a steel beam is arranged between the two supporting piers in a spanning mode and higher than the test pile, and a self-locking mechanism is arranged between the steel beam and the test pile and used for achieving matched connection between the steel beam and the test pile. The clamping ring and the slip are ingeniously combined, the pile body and the counter-force system are tightly connected, traditional connection modes such as steel bars, steel bars or end plates in the precast concrete pile are not needed, the construction process is simplified, cost is reduced, and work efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of pull-out test, in particular to a precast concrete pile pull-out test connection system based on a self-locking clamping ring slip technology. Background Art

[0002] The single pile vertical pullout static load test refers to a test method that determines the vertical pullout bearing capacity of the corresponding single pile by observing the vertical displacement of the pile top over time after applying vertical pullout force step by step to the pile top. The purpose of the single pile vertical pullout static load test is to determine the ultimate vertical pullout bearing capacity of the single pile. Its test data provides a design basis for the initial design and later construction drawings; or to determine whether the vertical pullout bearing capacity meets the design requirements. The pullout connection device of the concrete cast-in-place pile is to connect the main reinforcement of the cast-in-place pile steel cage with the reaction force system by electric welding. The steel bars and steel bars in the precast concrete pile are generally thinner and cannot provide sufficient reaction force and are not exposed at the pile head. Therefore, how to connect the precast concrete pile with the reaction force system is a difficult and important task.

[0003] At present, the pull-out connection device of precast concrete piles generally adopts the damaged pile head concrete, and the steel bars / steel rods in the pile are chiseled out to serve as anchor bars, or cast-in-place concrete is poured at a certain depth in the pile hole, and a certain number of steel bars are implanted in the cast-in-place concrete to serve as anchor bars, or the pile cap of the precast concrete pipe pile is connected to the reaction force system. The above conventional connection methods have certain disadvantages to a greater or lesser extent, and improper handling may directly lead to the inability to conduct the test normally. Utility Model Content

[0004] In view of this, the utility model aims to propose a precast concrete pile pull-out test connection system based on self-locking clamp and slip technology, which cleverly combines the two components of clamp and slip to tightly connect the pile body with the reaction system. It does not require the use of traditional connection methods such as steel bars, steel bars or end plates in precast concrete piles, simplifies the construction process, reduces costs and improves work efficiency.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] Precast concrete pile pullout test connection system based on self-locking clip slip technology, including support pier, steel beam, test pile and self-locking structure;

[0007] Precast concrete test piles on the ground, with a support block placed on each side of the test pile, a steel beam spanning between the two support piers, the steel beam being higher than the test pile, and a self-locking mechanism being arranged between the steel beam and the test pile to achieve a coordinated connection between the steel beam and the test pile.

[0008] Furthermore, the self-locking mechanism includes a snap ring, a slip, a connecting plate, a jack and a precision-rolled threaded rib;

[0009] The clamping ring is fixedly connected to the circumferential surface of the test pile through slips;

[0010] The connecting plate is placed on the upper surface of the steel beam by means of a jack;

[0011] The clamping ring and the connecting plate are connected by precision-rolled threaded ribs, and then fixed by installing nuts.

[0012] Furthermore, the clamping ring includes two half rings, both ends of the two half rings are provided with ear plates, and bolts passing through the ear plates can achieve fixation between the two half rings.

[0013] The two interconnected half rings can embrace the test pile.

[0014] Furthermore, the number of the slips is at least 3, which fit the circumference of the test pile, and the slips are arranged between the clamp ring and the surface of the test pile to increase friction.

[0015] Furthermore, a plurality of matching blocks are provided on the outer side of the semi-ring, and matching holes are provided on the matching blocks, and the matching holes are used for the first end of the finish-rolled threaded rib to pass through.

[0016] Furthermore, a plurality of slots are respectively provided at both ends of the connecting plate, the slots corresponding to the matching holes, and the slots are used for the second ends of the finish-rolled threaded ribs to pass through;

[0017] The nut is threadedly connected to the first end and the second section of the finely rolled threaded rib, and the connection plate and the matching pipe are limited to achieve the fixation between the connection plate, the clamping ring and the finely rolled threaded rib.

[0018] Furthermore, a jack is placed at the midpoint of the steel beam, and the center of the jack is set concentrically with the center of the test pile.

[0019] Furthermore, the top of the clamp ring is 4-5 cm lower than the top of the test pile.

[0020] Furthermore, by adjusting the jack, the connection strength between the clamping ring and the connecting plate can be changed.

[0021] Furthermore, the distance between the inner side of the supporting pier and the center of the test pile is not less than 2.5 meters.

[0022] Compared with the prior art, the precast concrete pile pull-out test connection system based on the self-locking clamp slip technology described in the utility model has the following advantages:

[0023] (1) The utility model discloses a precast concrete pile pull-out test connection system based on the self-locking clip-slip technology. The clip, as a key component for connecting the pile body and the reaction force system, has high strength and excellent elasticity and can withstand greater pressure during the test loading process. The slip is responsible for fixing and stabilizing, ensuring that the connection between the pile body and the reaction force system is firm and reliable. The two cooperate with each other, and the self-locking clip-slip structure system is made of strong materials and has a stable connection, which can fully provide the resistance required for the pull-out test.

[0024] (2) The utility model of the precast concrete pile pull-out test connection system based on the self-locking clamping ring slip technology has multiple advantages in that it uses fine-rolled threaded bars for connection. First, this method can greatly reduce the consumption of materials, thereby reducing costs. The design of the fine-rolled threaded bars makes it tighter and more reliable during the connection process, avoiding the looseness or material waste problems that may occur in traditional connection methods. Secondly, the fine-rolled threaded bars have excellent durability and stability, so that they can be used multiple times without affecting performance, which not only helps to improve resource utilization efficiency, but also conforms to the concept of sustainable development. Therefore, the application of fine-rolled threaded bars not only has significant economic advantages, but also shows important value in environmental protection and resource management.

[0025] (3) The utility model discloses a precast concrete pile pull-out test connection system based on the self-locking clamping ring slip technology, which adopts a nut fixed connection method to replace the traditional electric welding connection process. The nut fixed connection simplifies the operation process and greatly reduces the dependence on professional welders, thereby reducing labor costs. The nut connection method is more stable and reliable, ensuring the consistency and safety of the connection quality. In addition, the nut fixed connection is also highly flexible. By adjusting the nut, the height of the connection part can be easily changed to meet the specific requirements of different pile top elevations. This feature makes the connection method more adaptable in practical applications and can cope with various complex construction environments and technical requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of a precast concrete pile pull-out test connection system based on the self-locking snap ring slip technology according to an embodiment of the utility model;

[0028] Figure 2 It is a three-dimensional schematic diagram of the self-locking mechanism described in the embodiment of the utility model;

[0029] Figure 3 It is a bottom view of the self-locking mechanism described in the embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1. Support pier; 2. Steel beam; 3. Test pile; 4. Self-locking structure; 41. Snap ring; 411. Half ring; 42. Slip; 43. Connecting plate; 431. Slot; 44. Jack; 45. Finished rolled threaded bar; 46. Nut; 47. Matching block; 48. Matching hole. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0033] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] Precast concrete pile pull-out test connection system based on self-locking clasp 41 slip 42 technology, such as Figure 1-Figure 3 As shown, it includes a supporting pier 1, a steel beam 2, a test pile 3 and a self-locking structure 4;

[0037] A precast concrete test pile 3 is provided on the ground, with a support block placed on each side of the test pile 3. A steel beam 2 is arranged between the two support piers 1. The steel beam 2 is higher than the test pile 3. A self-locking mechanism is arranged between the steel beam 2 and the test pile 3 to achieve a coordinated connection between the steel beam 2 and the test pile 3.

[0038] The foundation under the supporting pier 1 is compacted and leveled to ensure sufficient bearing capacity; if the bearing capacity is insufficient, a steel plate can be laid on the foundation to enhance the bearing capacity.

[0039] Preferably, the self-locking mechanism comprises a clamping ring 41, a slip 42, a connecting plate 43, a jack 44 and a finely rolled threaded rib 45; the clamping ring 41 is fixedly connected to the circumferential surface of the test pile 3 through the slip 42; the connecting plate 43 is placed on the upper surface of the steel beam 2 through the jack 44;

[0040] The clamping ring 41 and the connecting plate 43 are connected by a precision-rolled threaded rib 45 , and then fixed by a mounting nut 46 .

[0041] Preferably, the clamping ring 41 includes two half rings 411, both ends of the two half rings 411 are provided with ear plates, and bolts passing through the ear plates can achieve fixation between the two half rings 411. The clamping ring 41 is spliced ​​by two half rings 411. Such a design facilitates installation; the two half rings 411 connected to each other can embrace the test pile 3.

[0042] Preferably, the number of the slips 42 is at least 3, which fit the circumference of the test pile 3 , and the slips 42 are arranged between the clamp ring 41 and the surface of the test pile 3 to increase friction.

[0043] Preferably, a plurality of matching blocks 47 are provided on the outer side of the semi-ring 411 , and matching holes 48 are provided on the matching blocks 47 , and the matching holes 48 are used for the first ends of the finish-rolled threaded ribs 45 to pass through.

[0044] Preferably, a plurality of slots 431 are respectively provided at both ends of the connecting plate 43, the slots 431 corresponding to the matching holes 48, and the slots 431 are used for the second ends of the finely rolled threaded ribs 45 to pass through; the width of the slots 431 is smaller than the width of the nut 46;

[0045] The nut 46 is threadedly connected to the first end and the second section of the fine-rolled threaded rib 45 , and the connection plate 43 and the matching pipe are limited to achieve the fixation between the connection plate 43 , the clamping ring 41 and the fine-rolled threaded rib 45 .

[0046] Preferably, a jack 44 is placed at the midpoint of the steel beam 2 , and the center of the jack 44 is concentric with the center of the test pile 3 .

[0047] Preferably, the top of the clamp ring 41 is 4-5 cm lower than the top of the test pile 3 .

[0048] Preferably, the connection strength between the clamping ring 41 and the connecting plate 43 can be changed by adjusting the jack 44 .

[0049] Preferably, the material of the clamping ring 41 is metal, and the distance between the inner side of the supporting pier 1 and the center of the test pile 3 is not less than 2.5 meters.

[0050] Test method:

[0051] S1. Arrange the support piers 1 symmetrically on both sides of the test pile 3; compact and level the foundation under the support pier 1 to ensure sufficient bearing capacity; if the bearing capacity is insufficient, steel plates can be laid on the foundation to enhance the bearing capacity; the distance between the inner side of the support pier 1 and the center of the test pile 3 should be no less than 2.5 meters;

[0052] S2. Place the steel beam 2 firmly on the supporting pier 1 so that the midpoint of the steel beam 2 coincides with the center of the test pile 3;

[0053] S3, placing an appropriate jack 44 above the midpoint of the steel beam 2, so that the center of the jack 44 coincides with the center of the test pile 3;

[0054] S4, placing the connecting plate 43 symmetrically on top of the jack 44;

[0055] S5, put the clamp ring 41 on the outside of the test pile 3, so that the top surface of the clamp ring 41 is about 5 cm lower than the top surface of the test pile 3. Then insert the slip 42 into the gap between the test pile 3 and the clamp ring 41;

[0056] S6, connect the clamp ring 41 and the connecting plate 43 above the jack 44 with the finely rolled threaded rib 45; the finely rolled threaded rib 45 is connected by a nut 46, and the nut 46 can be freely adjusted in height on the finely rolled threaded rib 45 to meet the installation requirements;

[0057] S7, connect the connecting plate 43 and the clamping ring 41 into a whole; after the jack 44 works, the clamping ring 41, the slip 42 and the test pile 3 will be tightly connected together, so as to achieve the purpose of pulling the test pile 3.

[0058] As a key component connecting the pile body and the reaction system, the clamp ring 41 has high strength and good elasticity and can withstand greater pressure during the test loading process; while the slip 42 plays a role of fixing and stabilizing, ensuring that the connection between the pile body and the reaction system is firm and reliable.

[0059] Furthermore, this connection method shows the characteristic of getting tighter and tighter during the test loading process; as the test loading progresses, the friction between the retaining ring 41 and the slip 42 gradually increases, making the connection tighter; this characteristic provides sufficient reaction force for the test, ensuring the accuracy and reliability of the test results.

[0060] In addition, the utility model has wide applicability. Whether for different types of pile body materials or for pile foundation projects of different sizes, the actual needs can be met by adjusting the specifications and quantities of the clamping ring 41 and the slips 42. This makes the utility model have broad application prospects in the field of pile foundation projects.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Precast concrete pile pull-out test connection system based on self-locking clasp slip technology, characterized by: It includes supporting piers, steel beams, test piles and self-locking structures; Precast concrete test piles on the ground, with a support block placed on each side of the test pile, a steel beam spanning between the two support piers, the steel beam being higher than the test pile, and a self-locking mechanism being set between the steel beam and the test pile to achieve a coordinated connection between the steel beam and the test pile; The self-locking mechanism includes a clamping ring, a slip, a connecting plate, a jack and a precision-rolled threaded rib; The clamping ring is fixedly connected to the circumferential surface of the test pile through slips; The connecting plate is placed on the upper surface of the steel beam by means of a jack; The clamping ring and the connecting plate are connected by precision-rolled threaded ribs, and then fixed by installing nuts; The clamping ring includes two half rings, both ends of which are provided with ear plates, and bolts passing through the ear plates can realize the fixation between the two half rings. The two interconnected half rings can embrace the test pile; A plurality of matching blocks are arranged on the outer side of the semi-ring, and matching holes are arranged on the matching blocks. The matching holes are used for the first end of the finish-rolled threaded rib to pass through.

2. The precast concrete pile pull-out test connection system based on the self-locking clasp slip technology according to claim 1 is characterized in that: The number of the slips is at least 3, which fit the circumference of the test pile. The slips are arranged between the clamp ring and the surface of the test pile to increase friction.

3. The precast concrete pile pull-out test connection system based on the self-locking clasp slip technology according to claim 1 is characterized in that: A plurality of slots are respectively provided at both ends of the connecting plate, the slots corresponding to the matching holes, and the slots are used for the second ends of the finish-rolled threaded ribs to pass through; The nut is threadedly connected to the first end and the second section of the finely rolled threaded rib, and the connection plate and the matching pipe are limited to achieve the fixation between the connection plate, the clamping ring and the finely rolled threaded rib.

4. The precast concrete pile pull-out test connection system based on the self-locking clasp slip technology according to claim 1 is characterized in that: A jack is placed at the midpoint of the steel beam, and the center of the jack is set concentrically with the center of the test pile.

5. The precast concrete pile pull-out test connection system based on the self-locking clasp slip technology according to claim 1 is characterized in that: The top of the clamp ring is 4-5 cm lower than the top of the test pile.

6. The precast concrete pile pull-out test connection system based on the self-locking clasp slip technology according to claim 3 is characterized in that: By adjusting the jack, the connection strength between the clamping ring and the connecting plate can be changed.

7. The precast concrete pile pull-out test connection system based on the self-locking clasp slip technology according to claim 1 is characterized in that: The distance between the inner side of the supporting pier and the center of the test pile shall not be less than 2.5 meters.

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