A connecting device for a reference pile and a reference beam for static load test

Abstract

The utility model relates to the field of foundation pile static load test discloses a kind of connecting device of datum pile and datum beam for static load test, including datum pile, datum beam, and test pile, datum beam is composed of main beam and vice beam, main beam is convex in the middle, vice beam is concave in the middle, and the square frame of accommodating test pile is formed by being detachably connected and surrounding by two buckles two;Two ends of datum beam are connected with two vertical datum piles by buckle one and buckle three respectively. Among them, buckle one realizes fixed end rigid locking, buckle three reserves horizontal micro-displacement space for simply supported end, and buckle two realizes vice beam angle fine adjustment by rotation adjustment;Datum pile adopts Φ50mm steel pipe, upper end welds round iron column to close pipe mouth, lower end welds solid square iron cone to enhance stability.The utility model solves the existing datum system fixed and simply supported restraint contradiction, square frame poor adaptability, dismounting efficiency low and other problems, improves the stability, adaptability of datum system, satisfies specification requirement.

Description

Technical Field

[0001] This utility model relates to the field of static load testing of foundation piles, and in particular to a connection device for a reference pile and a reference beam used in static load testing. Background Technology

[0002] Static load testing of foundation piles is a core test method used in engineering construction to detect the bearing capacity and deformation characteristics of foundation piles. It is an important branch of static load testing and is widely used in the quality acceptance and performance evaluation of foundation piles in the fields of building, bridge, and municipal engineering. The "Technical Specification for Testing Foundation Piles of Building Engineering" JGJ 106-2014 (hereinafter referred to as the Specification) stipulates that: the reference pile should be driven into the ground to a sufficient depth, the reference beam should have sufficient rigidity, one end of the beam should be fixed on the reference pile, and the other end should be simply supported on the reference pile. The reference beam should not be affected by temperature, vibration and other factors, and the displacement testing instruments should be installed symmetrically.

[0003] Existing foundation piles and reference beams mostly use welding or rigid clamps, which cannot achieve detachable installation, resulting in low assembly efficiency on the test site and difficulty in flexibly adjusting the span of the reference beam according to the test pile position. Although some devices use fastener connections, the fastener structure is simple and cannot meet the dual requirements of rigid locking at the fixed end and slight horizontal displacement at the simply supported end. Improper constraints can easily lead to deformation of the reference beam, affecting measurement accuracy. Furthermore, the fasteners connecting the reference beam cannot achieve fine-tuning of the angle, making it difficult to adapt to the actual shape of the test pile. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a connection device for a reference pile and a reference beam for static load testing. It aims to improve the existing problems that the reference pile and reference beam cannot achieve rigid locking at the fixed end and slight horizontal displacement at the simply supported end, and that the fasteners connecting the reference beam cannot achieve fine-tuning of the angle.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a connection device for a reference pile and a reference beam for static load testing, comprising a reference pile, a reference beam, and a test pile. Two reference piles are respectively vertically arranged on both sides of the test pile and are detachably connected to a horizontally arranged reference beam via fastener one and fastener three, respectively. The end connected by fastener one is a rigidly locked fixed end, and the end connected by fastener three is a simply supported end with reserved horizontal micro-displacement space. The reference beam includes a main beam and a secondary beam. The main beam is convex in the middle and detachably connected to the reference pile at both ends. The secondary beam is concave in the middle. The main beam and the secondary beam together form a square frame for accommodating the test pile. The two ends of the secondary beam are detachably connected to the main beam via fastener two. Fastener two is rotatably connected to the main beam and the secondary beam to achieve fine-tuning of the angle of the secondary beam relative to the main beam.

[0006] As a further description of the above technical solution:

[0007] The first fastener is a right-angle fastener formed by welding two interlocking rings together. It is used to connect the reference pile and the reference beam. The right ring is an open ring, and the open part is detachably connected by a bolt assembly. The left ring is a semi-circular ring with the opening to the left, and a rotating shaft is welded to the lower end. A rotating component is rotatably connected to the rotating shaft, and the upper end of the rotating component is detachably connected to the upper end of the first fastener by a bolt assembly.

[0008] As a further description of the above technical solution:

[0009] The third fastener is a right-angle fastener consisting of two interlocking rings welded together, used to connect the reference pile and the reference beam. The right ring is the same as the first fastener, and the left ring is a semi-circular opening facing upwards, allowing the reference beam to move slightly horizontally at the simply supported end.

[0010] As a further description of the above technical solution:

[0011] The second fastener is a rotating fastener formed by welding two parallel rings together. The left ring has the same structure as the left ring in the first fastener, and the right ring is the reverse structure formed by symmetrical transformation of the left ring.

[0012] As a further description of the above technical solution:

[0013] The main beam and the secondary beam are rotatably connected to the second fastener, enabling fine-tuning of the angle of the secondary beam relative to the main beam, ensuring that the inner side of the square frame fits tightly against the pile body.

[0014] As a further description of the above technical solution:

[0015] The connection between the rotating component of fastener one and the left ring sleeve, and the connection between the rotating component of fastener two and the corresponding ring sleeve, are all secured by bolt assemblies. The preload of the bolt assemblies restricts the relative rotation between the sub-beam and the main beam, thereby locking the adjusted structural position.

[0016] As a further description of the above technical solution:

[0017] Both the reference pile and the reference beam are Φ50mm steel pipes.

[0018] As a further description of the above technical solution:

[0019] A circular iron column is welded inside the upper end of the reference pile, and a solid square iron cone is welded to the lower end of the steel pipe. The circular iron column welded to the upper end can seal the pipe opening, enhance the structural strength of the pipe opening, and prevent the pipe from deforming when it is hammered in. The solid square iron cone welded to the lower end can enhance the anti-rotation ability and the stability of the stratum embedment, prevent tilting in soft soil strata, and ensure the vertical stability of the reference pile.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, fastener one is first used as the fixed end connector. Its spatially interlocking ring structure and rigid locking design can provide reliable torsional rigidity for the reference pile and the reference beam, avoid loosening caused by vibration, and achieve stable constraint of the fixed end. Fastener three is used as the simply supported end connector. Its upward-opening semi-circular structure reserves a small displacement space in the horizontal direction to meet the force requirements of the simply supported end of the reference beam and prevent deformation of the reference beam caused by excessive constraint. Fastener two, which connects the main beam and the secondary beam, adopts a rotatable parallel ring design, which can flexibly realize the angle of the secondary beam relative to the main beam, accurately adapt to the verticality deviation of the test pile, and ensure that the square frame and the pile body fit tightly.

[0022] 2. In this utility model, a detachable fastener connection structure replaces the traditional welding or rigid buckle, which greatly improves the assembly efficiency at the test site and allows for flexible adjustment of the reference beam span according to the test pile position. The reference beam is a square frame formed by the main beam and the secondary beam. With the angle adjustment function of the second fastener, it avoids the gap problem caused by the deviation of the test pile diameter in the traditional one-piece molded frame, and also eliminates the need for bolts to be tightened, reducing the risk of test pile surface damage and frame deformation. The reference pile is made of steel pipe, with a circular iron column welded to the upper end to seal the pipe opening to resist hammer deformation, and a solid square iron cone welded to the lower end to enhance the anti-rotation ability and the stability of the ground embedment. This effectively meets the requirement in the specification that the reference pile must be inserted into a stable stratum and remain vertical, thus improving the reliability and adaptability of the static load test reference system as a whole. Attached Figure Description

[0023] Figure 1 This is a front view of a connection device for a reference pile and a reference beam used in a static load test, as proposed in this utility model.

[0024] Figure 2 This is a top view of a connection device for a reference pile and a reference beam used in static load testing, as proposed in this utility model.

[0025] Figure 3 This is a structural schematic diagram of fastener one of the present utility model;

[0026] Figure 4 This is a structural schematic diagram of the second fastener of this utility model;

[0027] Figure 5 This is a structural schematic diagram of the third fastener of this utility model.

[0028] Legend:

[0029] 1. Benchmark pile; 2. Benchmark beam; 2-1. Main beam; 2-2. Secondary beam; 3. Test pile; 4. Fastener 1; 5. Fastener 2; 6. Fastener 3. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figures 1-5 A connection device for a reference pile and a reference beam for static load testing includes a reference pile 1, a reference beam 2, and a test pile 3. Two reference piles 1 are vertically arranged on both sides of the test pile 3, and are detachably connected to the horizontally arranged reference beam 2 through fastener 1 4 and fastener 3 6, respectively. The end connected by fastener 1 4 is a rigidly locked fixed end, and the end connected by fastener 3 6 is a simply supported end with reserved horizontal micro-displacement space. The reference beam 2 includes a main beam 2-1 and a secondary beam 2-2. The main beam 2-1 is convex in the middle and detachably connected to the reference piles 1 at both ends. The secondary beam 2-2 is concave in the middle. The main beam 2-1 and the secondary beam 2-2 together form a square frame for accommodating the test pile 3. The two ends of the secondary beam 2-2 are detachably connected to the main beam 2-1 through fastener 2 5. Fastener 2 5 is rotatably connected to the main beam 2-1 and the secondary beam 2-2 to achieve micro-adjustment of the angle of the secondary beam 2-2 relative to the main beam 2-1. Fastener 1 (4) is a right-angle fastener consisting of two staggered rings welded together, used to connect reference pile 1 and reference beam 2. The right ring is an open ring, and the open part is detachably connected by a bolt assembly. The left ring is a semi-circular ring with its opening to the left, and a rotating shaft is welded to its lower end. A rotating component is rotatably connected to the rotating shaft, and the upper end of the rotating component is detachably connected to the upper end of the left ring via a bolt assembly. Fastener 3 (6) is a right-angle fastener consisting of two staggered rings welded together, used to connect reference pile 1 and reference beam 2. The right ring has the same structure as the right ring of fastener 1 (4), and the left ring is a semi-circular ring with its opening to the upward, allowing the reference beam 2 to move slightly horizontally at its simply supported end. Fastener 2 (5) is a swivel fastener consisting of two parallel rings welded together. The left ring has the same structure as the left ring in fastener 1 (4), and the right ring is a reverse structure formed by symmetrical transformation of the left ring. The main beam 2-1 and the secondary beam 2-2 are rotatably connected to the ring sleeve of fastener 2-5, allowing for fine-tuning of the angle of the secondary beam 2-2 relative to the main beam 2-1, ensuring a tight fit between the inner side of the square frame and the pile body. The connection between the rotating component of fastener 1-4 and the left ring sleeve, and the connection between the rotating component of fastener 2-5 and the corresponding ring sleeve, are both secured by bolt assemblies. The preload of the bolt assemblies restricts the relative rotation between the secondary beam 2-2 and the main beam 2-1, thus locking the adjusted structural position. Both the reference pile 1 and the reference beam 2 are Φ50mm steel pipes. A circular iron column is welded inside the upper end of the reference pile 1 pipe, and a solid square iron cone is welded to the lower end of the steel pipe of the reference pile 1.

[0032] The specific implementation method is as follows: Before the test, two reference piles 1 are vertically driven into the stable strata on both sides of the test pile 3. The solid square iron cone at the lower end of the reference pile 1 enhances its embedding ability with the soil and prevents rotation and tilting due to vibration or soil disturbance during the test. The circular iron column welded to the upper end seals the pipe opening to ensure that the pipe does not deform when hammered in, providing a solid support foundation for the reference beam 2. The reference beam 2 forms a square frame through the main beam 2-1 and the secondary beam 2-2. The test pile 3 is centrally located through the square frame. The two ends of the secondary beam 2-2 are connected to the main beam 2-1 through fastener 2-5. Using the rotatable parallel ring structure of fastener 2-5, the angle of the secondary beam 2-2 is finely adjusted according to the actual verticality deviation of the test pile 3, so that the inner side of the square frame is tightly fitted with the test pile 3, eliminating gaps to avoid vibration interference. The connection between the reference beam 2 and the reference pile 1 adopts a mechanical structure with one end fixed and the other end simply supported: one end is rigidly locked by fastener 4, and the spatially staggered rings of fastener 4 respectively clamp the reference pile 1 and the main beam 2-1. The unclosed rings are locked by bolt assemblies to achieve torsional fixation, ensuring no relative displacement at this end and forming a stable fixed end; the other end is connected by fastener 6, whose upward-opening semi-circular structure reserves a small horizontal displacement space for the reference beam 2, meeting the force characteristics of the simply supported end and avoiding excessive constraint that could cause deformation of the reference beam 2. The overall detachable fastener connection design allows for flexible adjustment of the span of the reference beam 2 according to the position of the test pile 3, adapting to different test scenarios.

[0033] During the test, the system provides a stable reference platform for the displacement measuring instrument through the anti-disturbance stability of the reference pile 1, the rigid support of the reference beam 2, and the precise constraint and adjustment of the fasteners. This ensures that the settlement, displacement and other data of the test pile 3 under load are accurately collected, meeting the core requirements of the reference system in the "Technical Specification for Testing Foundation Piles of Building Engineering".

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A connection device for a reference pile and a reference beam for static load testing, comprising a reference pile (1), a reference beam (2), and a test pile (3), characterized in that: The two reference piles (1) are respectively vertically set on both sides of the test pile (3), and are detachably connected to the horizontally set reference beam (2) through fastener one (4) and fastener three (6), wherein the end connected by fastener one (4) is a rigidly locked fixed end, and the end connected by fastener three (6) is a simply supported end with reserved horizontal micro displacement space. The reference beam (2) includes a main beam (2-1) and a secondary beam (2-2). The main beam (2-1) is convex in the middle and detachably connected to the reference pile (1) at both ends. The secondary beam (2-2) is concave in the middle. The main beam (2-1) and the secondary beam (2-2) together form a square frame for accommodating the test pile (3). The two ends of the secondary beam (2-2) are detachably connected to the main beam (2-1) through fastener two (5). The fastener two (5) is rotatably connected to the main beam (2-1) and the secondary beam (2-2) to achieve fine-tuning of the angle of the secondary beam (2-2) relative to the main beam (2-1).

2. The connection device for a reference pile and a reference beam for static load testing according to claim 1, characterized in that: The fastener 1 (4) is a right-angle fastener made of two interlocking rings welded together, used to connect the reference pile (1) and the reference beam (2). The right ring is an unclosed ring, and the unclosed part is detachably connected by a bolt assembly. The left ring is a semi-circular ring with the opening to the left, and a rotating shaft is welded to the lower end. A rotating part is rotatably connected to the rotating shaft, and the upper end of the rotating part is detachably connected to the upper end of the left ring by a bolt assembly.

3. The connection device for a reference pile and a reference beam for static load testing according to claim 2, characterized in that: The fastener three (6) is a right-angle fastener made of two interlocking rings welded together, used to connect the reference pile (1) and the reference beam (2). The right ring is consistent with the right ring structure of the fastener one (4), and the left ring is a semi-circular opening with the opening facing upward, so that the reference beam (2) can be slightly displaced in the horizontal direction at the simply supported end.

4. The connection device for a reference pile and a reference beam for static load testing according to claim 2, characterized in that: The second fastener (5) is a rotating fastener formed by welding two parallel ring sleeves together. The left ring sleeve has the same structure as the left ring sleeve in the first fastener (4), and the right ring sleeve is the reverse structure formed by symmetrical transformation of the left ring sleeve.

5. The connection device for a reference pile and a reference beam for static load testing according to claim 4, characterized in that: The main beam (2-1) and the secondary beam (2-2) are rotatably connected to the fastener (5) to achieve a slight adjustment of the angle of the secondary beam (2-2) relative to the main beam (2-1), ensuring that the inner side of the square frame is tightly fitted to the pile body.

6. A connection device for a reference pile and a reference beam for static load testing according to any one of claims 1 to 5, characterized in that: The connection between the rotating part and the left ring sleeve in fastener one (4) and the connection between the rotating part and the corresponding ring sleeve in fastener two (5) are both locked and fixed by bolt assembly. The preload of the bolt assembly restricts the relative rotation between the sub-beam (2-2) and the main beam (2-1), thereby achieving the locking of the adjusted structural position.

7. The connection device for a reference pile and a reference beam for static load testing according to claim 1, characterized in that: Both the reference pile (1) and the reference beam (2) are Φ50mm steel pipes.

8. The connection device for a reference pile and a reference beam for static load testing according to claim 1, characterized in that: A circular iron column is welded inside the upper end of the reference pile (1), and a solid square iron cone is welded to the lower end of the steel pipe of the reference pile (1).

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