A stable annular load cell during grouting

Abstract

This application discloses a stable annular load cell for grouting, belonging to the field of load cells. It includes: a load cell body; an upper plate fixedly connected to the load cell body; two pre-grouting cavities disposed within the load cell body; a pre-grouting pipe fixedly connected to the pre-grouting cavities; a sliding sleeve fixedly connected to the upper plate; a pre-grouting port located at the lower end of the pre-grouting pipe within the pre-grouting cavity; a hydraulic mechanism disposed on the load cell body and the upper plate; the upper end of the pre-grouting pipe slidably connected to the sliding sleeve penetrating the upper plate; the pre-grouting pipe can be connected to grouting equipment; and after the testing is completed, concrete is injected into the pre-grouting cavity through the pre-grouting pipe and the pre-grouting port. Without depressurizing the hydraulic oil, the concrete within the pre-grouting cavity supports the upper plate, preventing deformation of the upper plate and the load cell body during grouting. The hydraulic mechanism can provide thrust to the load cell and the upper plate during testing, thereby enabling pile foundation load capacity testing.

Description

Technical Field

[0001] This application relates to the field of load cells, and more specifically, to a ring-shaped load cell that is stable during grouting. Background Technology

[0002] A load cell is a device that is embedded in the pile along with the reinforcing cage before concrete pouring. It is used to apply loads and conduct tests. After the test is completed, because deformation occurred during the test, concrete needs to be poured again. The deformed displacement is filled with concrete by grouting so that the tested pile foundation can also meet the actual use requirements. However, grouting is usually done through an oil injection pipe. At this time, the oil injection pipe is connected to the outside. The internal pressure of the load cell will squeeze out the hydraulic oil and cause the load cell to deform, making it difficult for subsequent grouting to fill completely.

[0003] A stable annular load cell for grouting is now provided. Utility Model Content

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] To address the technical problems mentioned in the background section, some embodiments of this application provide a stable annular load cell for grouting, comprising: a load cell body, The upper plate is fixedly connected to the upper end face of the load cell. The pre-grouting chamber has two sections, one in front and one behind, located within the load cell. The pre-grouting pipe is fixedly connected to the lower end wall of the pre-grouting cavity. The sliding sleeve is fixedly connected to the upper plate. The pre-grouting inlet is located at the lower end of the pre-grouting pipe within the pre-grouting cavity. The hydraulic mechanism is located in the load cell and the upper plate. The two pre-grouting chambers are connected by a pipe inside the load box. The upper end of the pre-grouting pipe passes through the sliding sleeve and the upper plate, and the pre-grouting pipe is fitted with the sliding sleeve with a clearance.

[0006] Furthermore, The hydraulic mechanism includes, Two hydraulic chambers are located on the left and right sides within the load cell. The hydraulic pipe is fixedly connected to the upper plate. The hydraulic plate has two parts that are fixedly connected to the lower end face of the upper plate. The two hydraulic chambers are connected by pipes provided inside the load box, the hydraulic plate is slidably connected to the hydraulic chamber, and the lower end of the hydraulic pipe is located inside the hydraulic chamber.

[0007] Furthermore, The position where the pre-grouting port communicates with the inner cavity of the pre-grouting pipe is chamfered.

[0008] Furthermore, The annular load cell also includes, Multiple connecting sleeves are provided, and are respectively fixed or threaded to the upper end of the pre-grouting pipe and the hydraulic pipe.

[0009] Furthermore, The annular load cell also includes, Multiple welding grooves are provided, respectively located at the lower end of the load box and the upper end of the upper plate. The size of the welding groove is slightly larger than the size of the reinforcing bar.

[0010] Furthermore, The annular load cell also includes, The guide hole is located inside the load cell. The guide plate has four fixed connections to the sidewall of the guide hole. The guide hole extends vertically through the load cell, and the four guide plates are circumferentially distributed around the axis of the guide hole.

[0011] Furthermore, The annular load cell also includes, The guide ring is fixedly connected to the lower end face of the upper plate. The guide groove is provided on the outer wall of the guide ring. The grouting pipe hole is located inside the guide ring. The grouting pipe hole extends vertically through the guide ring and the upper plate.

[0012] Furthermore, The outer side of the guide ring is slidably connected to the inner sidewall of the guide hole. The guide groove and the guide hole are vertically aligned, the guide hole is slidably connected to the guide groove, and the grouting pipe hole and the guide hole can be inserted and pass through the grouting pipe.

[0013] The beneficial effects of this application are as follows: It provides a stable annular load cell for grouting, and applies load to the load cell body and the upper plate through a hydraulic mechanism, thereby conducting load testing on the pile foundation. Through the pre-grouting pipe, grouting can be carried out first while maintaining stable hydraulic pressure after testing, avoiding the pressure change caused by grouting through the original hydraulic pipeline. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0015] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0016] In the attached diagram: Figure 1 This is an overall schematic diagram based on an embodiment of this application; Figure 2 This is a structural schematic diagram of a part of the embodiment, mainly showing the load box structure; Figure 3 yes Figure 2 A bottom view; Figure 4 This is a structural diagram of a part of an embodiment, mainly showing the upper plate structure; Figure 5 yes Figure 4 A bottom view.

[0017] Figure label: 11. Loading box; 12. Pre-grouting cavity; 13. Pre-grouting pipe; 14. Pre-grouting port; 15. Upper plate; 16. Sliding sleeve; 17. Connecting sleeve; 18. Guide hole; 19. Guide plate; 20. Hydraulic mechanism; 21. Hydraulic cavity; 22. Hydraulic pipe; 23. Welding groove; 24. Guide ring; 25. Guide groove; 26. Grouting pipe hole; 27. Hydraulic plate. Detailed Implementation

[0018] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0019] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0020] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Reference Figures 1-5 A stable annular load cell for grouting includes: a load cell body 11, an upper plate 15, pre-grouting chambers 12, pre-grouting pipes 13, pre-grouting inlets 14, and a hydraulic mechanism 20. The upper plate 15 is fixedly connected to the upper end face of the load cell body 11. Two pre-grouting chambers 12 are arranged one in front of the other inside the load cell body 11. The pre-grouting pipes 13 are fixedly connected to the lower end wall of the pre-grouting chambers 12. A sliding sleeve 16 is fixedly connected to the upper plate 15. The pre-grouting inlets 14 are located at the lower end of the pre-grouting pipes 13 within the pre-grouting chambers 12. The hydraulic mechanism 20 is located between the load cell body 11 and the upper plate 15. The two pre-grouting chambers 12 are connected by internal pipes within the load cell body 11. The pre-grouting pipe 13 is connected, with its upper end passing through the sliding sleeve 16 and the upper plate 15, and the pre-grouting pipe 13 and the sliding sleeve 16 are in clearance fit. The pre-grouting pipe 13 can be connected to the grouting equipment. After the testing is completed, concrete is injected into the pre-grouting cavity 12 through the pre-grouting pipe 13 and the pre-grouting port 14. Without depressurizing the hydraulic oil, the concrete in the pre-grouting cavity 12 supports the upper plate 15, preventing deformation of the upper plate 15 and the load box 11 during grouting. The hydraulic mechanism 20 can provide thrust to the load box 11 and the upper plate 15 during testing, thereby carrying out pile foundation load capacity testing.

[0024] The hydraulic mechanism 20 includes: a hydraulic chamber 21, a hydraulic plate 27, and a hydraulic pipe 22. The hydraulic chamber 21 has two chambers arranged on the left and right inside the load box 11. The hydraulic pipe 22 is fixedly connected to the upper plate 15. The hydraulic plate 27 has two chambers fixedly connected to the lower end face of the upper plate 15. The two hydraulic chambers 21 are connected to each other through a pipe provided inside the load box 11. The hydraulic plate 27 is slidably connected to the hydraulic chamber 21. The lower end of the hydraulic pipe 22 is located inside the hydraulic chamber 21. The hydraulic press connected through the hydraulic pipe 22 can provide thrust during testing.

[0025] The pre-grouting port 14 is chamfered at the position where it connects with the inner cavity of the pre-grouting pipe 13, so that concrete is less likely to accumulate at the connection position during grouting.

[0026] The annular load cell also includes multiple connecting sleeves 17, which are respectively fixed or threaded to the upper ends of the pre-grouting pipe 13 and the hydraulic pipe 22. The connecting sleeves 17 are used to connect the grouting pipe or the hydraulic pipe.

[0027] The annular load cell also includes a plurality of welding grooves 23 respectively located at the lower end of the load cell body 11 and the upper end of the upper plate 15. The size of the welding grooves 23 is slightly larger than the size of the reinforcing bars, so as to facilitate the welding of the reinforcing cage to the load cell body 11 and the upper plate 15.

[0028] Example 2: Refer to Figures 1-5 To guide the movement of the load cell 11 and the upper plate 15 during grouting and testing, guide holes 18, guide plates 19, guide rings 24, guide grooves 25, and grouting pipe holes 26 are provided. The annular load cell also includes a guide hole 18 located inside the load cell body 11, and four guide plates 19 fixedly connected to the side wall of the guide hole 18. The guide hole 18 penetrates the load cell body 11 vertically, and the four guide plates 19 are circumferentially distributed around the axis of the guide hole 18.

[0029] The annular load cell also includes a guide ring 24 fixedly connected to the lower end face of the upper plate 15, a guide groove 25 provided on the outer side wall of the guide ring 24, and a grouting pipe hole 26 provided inside the guide ring 24, wherein the grouting pipe hole 26 penetrates the guide ring 24 and the upper plate 15 vertically.

[0030] The outer side of the guide ring 24 is slidably connected to the inner side wall of the guide hole 18. The guide groove 25 is vertically corresponding to the guide hole 18. The guide hole 18 is slidably connected to the guide groove 25. The grouting pipe hole 26 and the guide hole 18 can be inserted into and pass through the grouting pipe. The grouting pipe is part of the grouting machine and is used in conjunction with this application during use.

[0031] The upper edge of the guide plate 19 is chamfered, and the lower edge of the guide groove 25 is chamfered to facilitate the sliding connection between the guide plate 19 and the guide groove 25.

[0032] Work or installation process: Before use, the user first welds the steel cage to the load box 11 and the upper plate 15 through the welding groove 23, inserts the concrete guide pipe through the grouting pipe hole 26 and the guide hole 18, connects the hydraulic pipe 22 to the hydraulic machine pipeline through the connecting sleeve 17, and connects the pre-grouting pipe 13 to the grouting machine pipeline through the connecting sleeve 17. In use, the reinforcing cage, load cell 11, and upper plate 15 are inserted into the pre-drilled pile foundation hole. Grouting is carried out through the concrete guide pipe. After grouting is completed, hydraulic oil is injected into the hydraulic pipe 22 through the hydraulic press and then into the hydraulic chamber 21 through the hydraulic pipe 22. The hydraulic oil applies force to the load cell 11 and upper plate 15 and then tests it. By observing the displacement of the load cell 11 and upper plate 15 during the application of force, as well as the deformation and displacement of the pile foundation, the pile foundation load capacity test results can be obtained. During testing, the sliding of the guide plate 19 and the guide groove 25, as well as the sliding of the guide ring 24 and the guide hole 18, can guide the displacement of the load box 11 and the upper plate 15, resulting in better testing results. After the test is completed, keep the hydraulic pipe 22 connected to the hydraulic press pipeline and keep the hydraulic press running. At the same time, the grouting machine pours concrete into the pre-grouting cavity 12 through the pre-grouting pipe 13, so that the gaps in the load box 11, the upper plate 15 and the pile foundation are filled with concrete while maintaining the stability after the test. After the filled concrete has solidified, disconnect the hydraulic pipe 22 from the hydraulic press pipeline and connect it to the grouting machine pipeline. Then, perform secondary grouting to complete the grouting and strengthening work of the test pile foundation.

[0033] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A ring load cell that is stable when slurry is added, comprising: Load box (11). Its characteristic is that the annular load cell also includes The upper plate (15) is fixedly connected to the upper end face of the load box (11). The pre-filled grouting cavity (12) has two chambers, one in front of the other, located within the load cell (11). The pre-grouting pipe (13) is fixedly connected to the lower end wall of the pre-grouting cavity (12). The sliding sleeve (16) is fixedly connected to the upper plate (15). The pre-grouting inlet (14) is located at the lower end of the pre-grouting pipe (13) within the pre-grouting cavity (12). A hydraulic mechanism (20) is located within the load cell (11) and the upper plate (15). The two pre-grouting chambers (12) are connected by pipes inside the load box (11), and the upper end of the pre-grouting pipe (13) passes through the sliding sleeve (16) and the upper plate (15), and the pre-grouting pipe (13) is in clearance fit with the sliding sleeve (16).

2. The stable annular load cell during grouting according to claim 1, characterized in that: The hydraulic mechanism (20) includes, The hydraulic chamber (21) has two chambers located on the left and right sides within the load cell (11). The hydraulic pipe (22) is fixedly connected to the upper plate (15). Two hydraulic plates (27) are provided and fixedly connected to the lower end face of the upper plate (15). The two hydraulic chambers (21) are connected by a pipe provided in the load box (11), the hydraulic plate (27) is slidably connected to the hydraulic chamber (21), and the lower end of the hydraulic pipe (22) is located in the hydraulic chamber (21).

3. The stable annular load cell for grouting according to claim 1, characterized in that: The pre-grouting port (14) is chamfered at the position where it connects with the inner cavity of the pre-grouting pipe (13).

4. A stable annular load cell for grouting according to claim 2, characterized in that: The annular load cell also includes, Multiple connecting sleeves (17) are provided and are respectively fixed or threaded to the upper end of the pre-grouting pipe (13) and the hydraulic pipe (22).

5. A stable annular load cell for grouting according to claim 1, characterized in that: The annular load cell also includes, The welding groove (23) is provided with multiple grooves respectively located at the lower end of the load box (11) and the upper end of the upper plate (15). The size of the welding groove (23) is slightly larger than that of the reinforcing bar.

6. A stable annular load cell for grouting according to claim 1, characterized in that: The annular load cell also includes, The guide hole (18) is provided inside the load box (11). The guide plate (19) has four parts and is fixedly connected to the side wall of the guide hole (18). The guide hole (18) penetrates the load box (11) vertically, and the four guide plates (19) are circumferentially distributed around the axis of the guide hole (18).

7. A stable annular load cell for grouting according to claim 6, characterized in that: The annular load cell also includes, The guide ring (24) is fixedly connected to the lower end face of the upper plate (15). The guide groove (25) is provided on the outer wall of the guide ring (24). The grouting pipe hole (26) is located inside the guide ring (24). The grouting pipe hole (26) passes through the guide ring (24) and the upper plate (15) from top to bottom.

8. A stable annular load cell for grouting according to claim 7, characterized in that: The outer side of the guide ring (24) is slidably connected to the inner side wall of the guide hole (18), wherein the guide groove (25) is vertically corresponding to the guide hole (18), and the guide hole (18) is slidably connected to the guide groove (25).

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