A reference beam structure for pile foundation static load test

Abstract

This utility model discloses a benchmark beam structure for static load testing of pile foundations, comprising a main beam and a secondary connecting beam frame. The main beam is composed of multiple connecting segments. Each connecting segment is equipped with insert piles, bolts, insert grooves, structural plates, limiting components, and reinforcing bar components. The secondary connecting beam frame is installed on both sides of the outer side of the connecting segment and includes a secondary beam body, connecting reinforcing bars, an inner groove, and an outer protrusion. The reinforcing bar component is located inside the connecting segment. The left side of the structural plate is connected to the insert pile, and the right side is connected to the reinforcing bar component. The insert groove is located at the tail end of the connecting segment. The connecting reinforcing bar is located inside the connecting segment, with one end connected to the reinforcing bar component and the other end connected to the secondary beam body. The inner groove is located at the front end of the secondary beam body. The outer protrusion is located at the rear end of the secondary beam body. This utility model forms a double-locking connection method through the mutual cooperation of the insert piles and insert grooves, as well as the outer protrusion and inner groove between the connecting segments. This effectively improves the overall stiffness and stability after splicing multiple connecting segments, ensuring the accuracy of experimental data.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation testing technology, specifically to a reference beam structure for static load testing of pile foundations. Background Technology

[0002] In building construction, the stability of the foundation directly affects the safety and durability of the overall structure. To accurately assess the bearing capacity and deformation characteristics of the foundation, static load tests on pile foundations are widely used. These tests simulate actual load conditions and measure key parameters such as pile settlement and horizontal displacement. A reference beam is a crucial measuring tool used in building construction for foundation testing. Its main function is to provide a stable measurement benchmark for indicators such as foundation settlement and deformation. It is typically erected on the test pile and surrounding reference piles. High-precision sensors or dial gauges are used to observe changes in the spatial position of the reference beam, thereby determining whether the foundation has settled or shifted horizontally, providing a basis for assessing the bearing capacity of the pile foundation and the safety of the project. Therefore, to ensure the accuracy of long-term measurements, the reference beam must possess characteristics such as high rigidity, low thermal deformation, and resistance to environmental interference. Currently, commonly used materials include steel or concrete, with the length adjusted according to actual needs to minimize measurement errors caused by temperature changes. Generally, stainless steel, special alloys, or fiber composites with low coefficients of thermal expansion are preferred. However, the site for pile foundation static load tests is often located in open areas or areas with limited transportation conditions. Integral long beams (commonly 6-12 meters) are extremely inconvenient to transport and install on-site. To facilitate transportation and on-site installation, existing reference beams typically adopt a prefabricated design, dividing the beam into multiple segments. This greatly reduces transportation difficulty and costs, and improves the flexibility and efficiency of on-site assembly, making it particularly suitable for large-scale testing projects or construction sites with limited space.

[0003] Patent document CN211447051U discloses an assembled reference beam device for static load testing of pile foundations, comprising: a reference beam, one end of which is fixed on a first mounting base and the other end of which is placed on a second mounting base; the reference beam includes multiple reference beam segments, each of which includes three main beams that are parallel to each other and placed horizontally, the longitudinal sections of the three main beams forming an equilateral triangle; multiple reinforcing beams, spaced apart between the three main beams, each reinforcing beam being an equilateral triangle with its three vertices welded to the three main beams; and multiple connectors, disposed between adjacent reference beam segments, each connector including two connecting plates, which are welded to the main beams at the connecting ends of adjacent reference beam segments, the two connecting plates having multiple first openings along the axial direction of the main beams, and the two connecting plates being locked by a first screw and nut assembly.

[0004] Although the device adopts a prefabricated structure, transporting the reference beam in segments for convenient transportation and on-site use, its connection method relies solely on screw and nut assemblies for locking. There is no butt joint reinforcement between the beams, and it lacks effective bending and shear reinforcement measures. During long-term static load tests, this connection method may be insufficient in stiffness, causing the beams to be prone to bending deformation at the joints due to unstable connections. This directly affects the stability of the measurement benchmark and the accuracy of the experimental results. Utility Model Content

[0005] The purpose of this invention is to provide a reference beam structure for static load testing of pile foundations that is easy to install and disassemble, convenient to transport, has a stable connection structure, and high measurement accuracy. This solves the technical problem that existing prefabricated reference beams are prone to bending deformation during long-term static load testing due to unstable connections, which affects the stability of the measurement reference and the accuracy of experimental results.

[0006] To solve the above technical problems, the solution adopted by this utility model is as follows: A reference beam structure for static load testing of pile foundations includes a main beam body and secondary connecting beam frames; the main beam body is composed of multiple connecting segments; each connecting segment is provided with insert piles, bolts, insert grooves, structural plates, limiting components, and reinforcing steel components; two secondary connecting beam frames are provided, symmetrically installed on both sides of the connecting segments, and include a secondary beam body, an inner groove, an outer protrusion, and connecting reinforcing steel; two insert piles are provided; the reinforcing steel components are fixedly installed inside the connecting segments; The left side of the structural plate is fixedly connected to the symmetrically arranged plugs, and the right side is fixedly connected to the reinforcing steel assembly; the plug groove is opened at the tail end of the connecting section and matches the plug; the tail end of the connecting section and the plug are provided with threaded grooves that match the plug; the connecting steel bar is located inside the connecting section, one end is fixedly connected to the reinforcing steel assembly, and the other end extends out of the connecting section and is fixedly connected to the sub-beam; the inner groove is opened at the front end of the sub-beam; the outer protrusion is fixedly installed at the rear end of the sub-beam; the inner groove and the outer protrusion match.

[0007] Based on actual usage requirements, the length of the main beam is determined, and consequently, the number of connecting sections is determined. The insertion slot of the previous connecting section is fitted onto the insertion pile of the next connecting section. Simultaneously, the outer protrusions of the auxiliary connecting beams on both sides of the previous connecting section are engaged in the inner grooves of the auxiliary connecting beams on both sides of the next connecting section. Connecting sections are assembled by interlocking the insertion slots and insertion piles, and the inner grooves and outer protrusions. After connecting all sections together, the threaded bolts are sequentially screwed into the threaded grooves of the insertion piles at the tail end of the previous connecting section and the front end of the next connecting section for further fixation. The internal structure of the connecting sections is supported by steel reinforcement components, and the sides are supported by auxiliary connecting beams. The secondary beam provides auxiliary support to maintain the stability of the overall structure. The secondary beam is fixedly connected to the steel reinforcement components inside the connecting section through connecting steel bars, and then the secondary beam is fixedly installed on the outside of the connecting section. The whole can be adjusted and assembled according to the actual use, which facilitates transportation and use, and the installation and disassembly are simple. The mechanical connection with double locking through "interlocking bolts between connecting sections" and "interlocking anchoring of secondary connecting beam frame" improves the overall stiffness and stability after splicing multiple connecting sections. It ensures that during long-term static load test, the main beam composed of multiple connecting sections will not produce slight deflection or deformation at the connection due to external load or environmental disturbance, thus ensuring the accuracy of experimental data.

[0008] Furthermore, the limiting component includes a limiting block and a limiting groove; the limiting groove is formed on the outer side of the plug; the limiting block matches the limiting groove and is fixedly installed on the inner wall of the plug groove.

[0009] During the insertion of the splice into the splice slot, the limiting grooves on both sides of the splice will be embedded in the limiting block in the splice slot. Through the action of the limiting block and the limiting groove, the connection section can effectively prevent the occurrence of slight circumferential misalignment or radial displacement of the connection part during the tightening of the splice or when subjected to external lateral force, ensuring that the main beam axis of all connection sections is always on the same straight line, and effectively avoiding measurement errors caused by deformation of the connection part.

[0010] Furthermore, the steel reinforcement assembly includes inner frame steel reinforcement and supporting steel reinforcement; there are four inner frame steel reinforcements, which are respectively installed at the four corners on the right side of the structural plate; there are several supporting steel reinforcements, which are in an "X" shape, and their four ends are respectively fixedly connected to the four inner frame steel reinforcements; the connecting steel reinforcement extends into the connecting section and is fixedly connected to the center of the supporting steel reinforcement.

[0011] The four inner frame steel bars are welded to the four corners on the right side of the structural slab. The outer side is welded to the inner wall of the connecting section, and the inner side is fixedly connected to the "X"-shaped supporting steel bars. The four inner frame steel bars are supported by the "X"-shaped supporting steel bars, forming a spatial truss structure that can effectively resist deformation in all directions. The sub-beam is fixedly connected to the center of the supporting steel bars through the connecting steel bars, which further increases the structural stability of the sub-beam frame.

[0012] The working principle of this utility model is as follows: Based on actual usage requirements, the length of the main beam is determined, and thus the number of connecting sections is determined. The insertion slot of the previous connecting section is fitted onto the insertion pile of the next connecting section. Simultaneously, the outer protrusions of the auxiliary connecting beams on both sides of the previous connecting section are placed into the inner grooves of the auxiliary connecting beams on both sides of the next connecting section. The connecting sections can be combined by interlocking the insertion slots and insertion piles, and the inner grooves and outer protrusions. During the insertion of the insertion piles into the insertion slots, the limiting grooves on both sides of the insertion piles will embed into the limiting blocks in the insertion slots. After all the connecting sections are connected together, the threaded bolts are screwed into the threaded grooves in the insertion piles at the tail end of the previous connecting section and the front end of the next connecting section for further fixation. The interior of the connecting section is supported by internal frame steel bars and "X"-shaped support steel bars, and the sides are supported by the secondary beams of the auxiliary connecting beams. The secondary beams are fixedly connected to the steel reinforcement components inside the connecting section by connecting steel bars, and then the secondary beams are fixedly installed on the outside of the connecting section to maintain the stability of the overall structure.

[0013] The beneficial effects of this utility model are as follows: 1. This utility model forms a double-locking connection method through the cooperation of the plug-in piles and plug-in grooves between the connecting sections, as well as the cooperation of the outer protrusions and inner grooves of the secondary connecting beam frame. This can effectively improve the overall rigidity and stability of the multi-section connecting sections after splicing, and ensure that the main beam will not produce slight deflection or deformation at the connection due to external loads or environmental disturbances during long-term static load tests, thereby ensuring the accuracy of experimental data. Moreover, the overall installation and disassembly are simple, and it can be adjusted and assembled according to actual use, which is convenient for transportation and use.

[0014] 2. This utility model effectively prevents minor circumferential misalignment or radial displacement of the plug and slot during the fastening of the bolts or when subjected to external lateral forces, by using the limiting blocks and limiting slots of the limiting components. This ensures that the main beam axis of all connecting sections is always on the same straight line, avoiding measurement errors caused by deformation of the connection parts. The spatial truss structure composed of internal frame steel bars and "X"-shaped support steel bars can effectively support the connecting section and enhance its resistance to deformation. The secondary beam is fixedly connected to the center of the connecting steel bars and the support steel bars, further enhancing the stability of the secondary beam installed on the connecting section. The whole structure can effectively resist deformation in all directions, ensuring the high precision and stability of the main beam in long-term static load tests. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the connecting section structure of this utility model; Figure 3 This is a schematic diagram of the insertion slot structure of this utility model; Figure 4 This is a schematic diagram of the structural plate of this utility model; Figure 5 This is a schematic diagram of the secondary connecting beam structure of this utility model.

[0016] In the diagram: 1. Main beam; 101. Connecting section; 102. Limiting block; 103. Inserted pile; 104. Limiting groove; 105. Inserted bolt; 106. Inserted groove; 107. Structural slab; 108. Internal frame reinforcement; 109. Supporting reinforcement; 110. Threaded groove; 2. Secondary connecting beam frame; 201. Secondary beam; 202. Inner groove; 203. Outer protrusion; 204. Connecting reinforcement. Detailed Implementation

[0017] 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.

[0018] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. 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 an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] The following is a detailed description of a reference beam structure for static load testing of pile foundations according to the present invention, with reference to the accompanying drawings: Example

[0020] A reference beam structure for static load testing of pile foundations includes a main beam body 1 and a secondary connecting beam frame 2. The main beam body 1 is composed of multiple connecting segments 101. Each connecting segment 101 is provided with insert piles 103, bolts 105, insert grooves 106, structural plates 107, limiting components, and reinforcing steel components. Two secondary connecting beam frames 2 are provided, symmetrically installed on both sides of the connecting segments 101, and include a secondary beam body 201, an inner groove 202, an outer protrusion 203, and connecting reinforcing steel bars 204. Two insert piles 103 are provided. The reinforcing steel components are fixedly installed inside the connecting segments 101. The left side of the structural plate 107 is fixedly connected to the mutually symmetrical insert piles 103, and the right side... The connecting section 101 is fixedly connected to the reinforcing steel assembly; the insertion groove 106 is opened at the tail end of the connecting section 101 and matches the insertion pile 103; the tail end of the connecting section 101 and the insertion pile 103 are provided with threaded grooves 110 that match the plug 105; the connecting steel bar 204 is located inside the connecting section 101, one end is fixedly connected to the reinforcing steel assembly, and the other end extends out of the connecting section 101 and is fixedly connected to the sub-beam 201; the inner groove 202 is opened at the front end of the sub-beam 201; the outer protrusion 203 is fixedly installed at the rear end of the sub-beam 201; the inner groove 202 and the outer protrusion 203 match.

[0021] The working principle of this embodiment is as follows: Based on actual usage requirements, the length of the main beam 1 is determined, and thus the number of connecting segments 101 is determined. The insertion slot 106 of the previous connecting segment 101 is fitted onto the insertion post 103 of the next connecting segment 101. Simultaneously, the outer protrusions 203 of the auxiliary connecting beams 2 on both sides of the previous connecting segment 101 are engaged in the inner grooves 202 of the auxiliary connecting beams 2 on both sides of the next connecting segment 101. The connecting segments 101 can be combined by interlocking the insertion slots 106 and insertion posts 103, and the inner grooves 202 and outer protrusions 203. After connecting all the connecting segments 101 together, the insertion... Bolts 105 are screwed into the threaded grooves 110 of the plug piles 103 at the tail end of the previous connecting section 101 and the front end of the next connecting section 101 in sequence. The interior of the connecting section 101 is supported by steel reinforcement components, and the two sides are supported by the sub-beams 201 of the sub-connecting beam frame 2. The sub-beams 201 are fixedly connected to the steel reinforcement components inside the connecting section 101 by connecting steel bars 204, thereby fixing the sub-beams 201 to the outside of the connecting section 101 to maintain the stability of the overall structure. After the connecting sections 101 are connected into the main beam 1, the pile foundation static load test can be carried out to determine whether the foundation has shifted or settled. Example

[0022] The difference from Embodiment 1 is that the limiting component includes a limiting block 102 and a limiting groove 104; the limiting groove 104 is formed on the outer side of the plug-in pile 103; the limiting block 102 matches the limiting groove 104 and is fixedly installed on the inner wall of the plug-in groove 106; the reinforcing steel component includes inner frame reinforcing steel 108 and supporting reinforcing steel 109; there are four inner frame reinforcing steel 108, which are respectively installed at the four corners on the right side of the structural plate 107; there are several supporting reinforcing steel 109, which are in an "X" shape, and their four ends are respectively fixedly connected to the four inner frame reinforcing steel 108; the connecting reinforcing steel 204 extends into the connecting section 101 and is fixedly connected to the center of the supporting reinforcing steel 109.

[0023] During the insertion of the splice 103 into the splice slot 106, the limiting block 102 within the splice slot 106 is embedded in the limiting slots 104 on both sides of the splice 103. The limiting block 102 and the limiting slots 104 ensure that the axis of the main beam 1 of all connecting sections 101 remains aligned. Four inner frame steel bars 108 are welded to the four corners of the right side of the structural slab 107, with their outer sides welded to the inner wall of the connecting section 101 and their inner sides fixedly connected to the "X"-shaped supporting steel bars 109. The "X"-shaped supporting steel bars 109 support the four inner frame steel bars 108, forming a spatial truss structure that effectively resists deformation in all directions. The secondary beam 201 is fixedly connected to the center of the supporting steel bars 109 via the connecting steel bars 204, further increasing the structural stability of the secondary connecting beam frame 2.

[0024] The working principle of this embodiment is the same as that of Embodiment 1.

[0025] 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 reference beam structure for static load tests of pile foundations, characterized in that: The system includes a main beam (1) and a secondary connecting beam frame (2). The main beam (1) is composed of multiple connecting sections (101). Each connecting section (101) is provided with a spigot (103), a bolt (105), a spigot groove (106), a structural plate (107), a limiting component, and a reinforcing steel component. The secondary connecting beam frame (2) consists of two components, symmetrically installed on both sides of the connecting section (101), and includes a secondary beam body (201), an inner groove (202), an outer protrusion (203), and connecting reinforcing steel (204). Two spigots (103) are provided. The reinforcing steel component is fixedly installed inside the connecting section (101). The left side of the structural plate (107) is fixedly connected to the symmetrically arranged plugs (103), and the right side is fixedly connected to the steel reinforcement assembly; the plug groove (106) is opened at the tail end of the connecting section (101) and matches the plug (103); the tail end of the connecting section (101) and the plug (103) are provided with threaded grooves (110) that match the plug (105). The connecting steel bar (204) is located inside the connecting section (101), with one end fixedly connected to the steel bar assembly and the other end extending out of the connecting section (101) and fixedly connected to the sub-beam body (201); the inner groove (202) is opened at the front end of the sub-beam body (201); the outer protrusion (203) is fixedly installed at the rear end of the sub-beam body (201); the inner groove (202) and the outer protrusion (203) are matched.

2. The reference beam structure for static load testing of pile foundations according to claim 1, characterized in that: The limiting component includes a limiting block (102) and a limiting groove (104); the limiting groove (104) is opened on the outside of the plug (103); the limiting block (102) matches the limiting groove (104) and is fixedly installed on the inner wall of the plug groove (106).

3. The reference beam structure for static load testing of pile foundations according to claim 1, characterized in that: The steel reinforcement assembly includes inner frame steel bars (108) and supporting steel bars (109); there are four inner frame steel bars (108), which are respectively installed at the four corners on the right side of the structural plate (107); there are several supporting steel bars (109), which are in an "X" shape, and their four ends are respectively fixedly connected to the four inner frame steel bars (108); the connecting steel bars (204) extend into the connecting section (101) and are fixedly connected to the center of the supporting steel bars (109).

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