Novel load box

Abstract

The utility model discloses a novel load box which is characterized in that the load box is composed of an upper panel, a lower panel, a hydraulic device and a sleeve structure, the top of the upper panel and the bottom of the lower panel are both provided with steel bar connecting pieces, a hydraulic groove and a connecting column are arranged below the upper panel, and a grouting through hole is formed in the middle of the upper panel; the top of the upper panel is provided with three connecting through holes and a hanging ring, the lower panel is provided with a connecting rod, an upper thread fixing rod and a connecting protection plate, the three hydraulic devices are automatically installed on the lower panel in a delta shape at equal intervals, and the sleeve structure is installed in the middle of the lower panel and connected with the hydraulic devices and the connecting protection plate. The device is stable in structure, convenient to operate and suitable for being used as a loading device in a static load experiment of a self-balancing method pile foundation.

Description

Technical Field

[0001] The present invention relates to the field of load cells, and more particularly to a novel load cell. Background Art

[0002] Currently, the main methods for static load tests of pile foundations are the stacking method, the anchor pile method, and the self-balanced method. Among them, the self-balanced method is a method for detecting the bearing characteristics of pile foundations by embedding loading equipment in the pile.

[0003] The detection principle of the self-balanced method is to bury a special loading device - a load cell, together with the steel cage, at the corresponding position in the pile before concrete pouring. The pressure pipes of the load cell and other required test devices are led from the pile body to the ground, and then the pile is cast. A pressure pump applies pressure to the load cell on the ground, generating a loading force inside the pile body. By calculating and analyzing the relationship between the loading force and these parameters, we can not only obtain the bearing capacity of the pile foundation, but also obtain a series of data such as the side resistance coefficient of each soil layer, the side resistance of the pile, and the end bearing capacity of the pile. This method can be used to provide data basis for design and also for the inspection of the bearing capacity of engineering piles.

[0004] The currently used load cells have the following drawbacks: 1. The connection method with steel bars is mostly welding. Affected by the skills of welders and the welding environment, there are differences in welding strength, further affecting the connection strength between the load cell and the steel bars; 2. After the load cell is integrated with the pile foundation, the hydraulic fluid in its internal hydraulic device will gradually leak from the hydraulic device over time, affecting the strength of the entire pile foundation; 3. After the load cell is integrated with the pile foundation, there is sometimes a situation where the concrete pouring in the connection guard plate of the load cell is not in place, affecting the overall strength of the pile foundation. Therefore, the present invention provides a novel load cell. Summary of the Invention

[0005] The present invention provides a novel load cell. Its purposes are as follows: First, it uses a mechanical connection method to fix the load cell, replacing the welding connection method, avoiding the problem that the connection strength between the load cell and the steel bars is affected by differences in welding strength; Second, it uses a sleeve structure to lead out the hydraulic fluid in the hydraulic device and further injects concrete slurry into the hydraulic device to solve the problem that the strength of the pile foundation is affected by the leakage of hydraulic fluid in traditional equipment; Third, it uses a slurry guiding channel to guide slurry into the connection guard plate, reducing the probability of incomplete concrete pouring in the connection guard plate.

[0006] To achieve the above purposes, the technical solutions adopted by the present invention are as follows:

[0007] A new type of load cell, characterized in that the load cell is composed of an upper panel, a lower panel, a hydraulic device and a casing structure. There are steel bar connectors at the top of the upper panel and the bottom of the lower panel. There is a hydraulic groove and a connecting column below the upper panel. There is a grouting through hole in the middle of the upper panel, and there are three connecting through holes and lifting rings on the top of the upper panel. There are connecting rods, upper threaded retaining rods and connecting guard plates on the lower panel. There are three groups of hydraulic devices in total, and the three groups of hydraulic devices are equidistantly installed on the lower panel in a "pin" shape. The casing structure is installed in the middle of the lower panel, and the casing structure is connected to the hydraulic device and the connecting guard plate respectively.

[0008] Preferably, the connecting guard plate connects the three hydraulic devices, and there is a grouting opening on the inner side of the connecting guard plate.

[0009] Preferably, when the connecting column is inserted into the connecting rod, a piston-like structure is formed.

[0010] Preferably, the casing structure is composed of a liquid injection pipe, an extraction pipe, a grouting pipe and a slurry guiding channel.

[0011] Preferably, the liquid injection pipe is composed of a liquid injection main pipe and liquid injection branch pipes. There are three liquid injection branch pipes in total. The tail ends of the liquid injection branch pipes are respectively connected to the three groups of hydraulic devices, and the heads are merged and connected to the liquid injection main pipe. The liquid injection branch pipes and the liquid injection main pipe are arranged in an umbrella shape, and the diameter of the liquid injection branch pipe is 1 / 3 of the diameter of the liquid injection main pipe.

[0012] Preferably, the extraction pipe is composed of an extraction main pipe and extraction branch pipes. There are three extraction branch pipes in total. The three extraction branch pipes are respectively connected to the three groups of hydraulic devices, and the heads are merged and connected to the extraction main pipe. The extraction branch pipes and the extraction main pipe are arranged in an umbrella shape, the diameter of the extraction branch pipe is 1 / 3 of the diameter of the extraction main pipe, and the diameter of the extraction main pipe is 1 / 2 of the diameter of the liquid injection branch pipe.

[0013] Preferably, the grouting pipe is sleeved on the liquid injection main pipe and the extraction main pipe, and the bottom of the grouting pipe is connected to the slurry guiding channel.

[0014] Preferably, the tail end of the slurry guiding channel is connected to the connecting guard plate, and the head end of the slurry guiding channel is connected to the grouting pipe.

[0015] Compared with the existing technology, the following beneficial effects are achieved:

[0016] Through the optimal design and combination of the upper panel, lower panel, hydraulic device and casing structure, the present invention becomes a new type of load cell. Steel bar connectors are added to the top of the upper panel and the bottom of the lower panel, and the load cell is fixed by mechanical connection, replacing the welding connection method, thus avoiding the problem that the connection strength between the load cell and the steel bars is affected by the difference in welding strength. The casing structure is used to lead out the hydraulic fluid in the hydraulic device, and further inject concrete slurry into the hydraulic device, solving the problem that the strength of the pile foundation is affected by the leakage of hydraulic fluid in traditional equipment. The slurry guiding channel is used to guide the slurry into the connecting guard plate, reducing the probability of incomplete concrete pouring in the connecting guard plate. At the same time, the structure of the present invention is stable and the operation is convenient, making it suitable to be used as a loading device in the static load test of self-balanced pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the lower panel, hydraulic device and casing structure.

[0019] Figure 3 It is a schematic diagram of the upper panel structure.

[0020] The components corresponding to the labels in the figure are: upper panel 11, lower panel 1, hydraulic device 5, casing structure 14, steel bar connector 13, hydraulic groove 15, connecting column 12, grouting through hole 18, connecting through hole 16, lifting ring 17, connecting rod 3, upper threaded retaining rod 2, connecting guard plate 4, grouting opening 6, liquid injection pipe 9, lead-out pipe 10, grouting pipe 8, slurry guiding channel 7, liquid injection main pipe 902, liquid injection branch pipe 901, lead-out main pipe 102, lead-out branch pipe 101. DETAILED DESCRIPTION OF THE INVENTION

[0021] Refer to the appendix Figures 1 to 3 : A new type of load cell, characterized in that the load cell is composed of an upper panel 11, a lower panel 1, a hydraulic device 5 and a casing structure 14. Steel bar connectors 13 are provided at the top of the upper panel 11 and the bottom of the lower panel 1. A hydraulic groove 15 and a connecting column 12 are provided below the upper panel 11. A grouting through hole 18 is provided in the middle of the upper panel 11, and three connecting through holes 16 and a lifting ring 17 are provided on the top of the upper panel 11. Connecting rods 3, upper threaded retaining rods 2 and a connecting guard plate 4 are provided on the lower panel 1. There are three groups of hydraulic devices 5, and the three groups of hydraulic devices 5 are equidistantly installed on the lower panel 1 in a "pin" shape. The casing structure 14 is installed in the middle of the lower panel 1, and the casing structure 14 is respectively connected to the hydraulic device 5 and the connecting guard plate 4.

[0022] Preferably, the connecting guard plate 4 connects the three hydraulic devices 5, and a grouting opening 6 is provided on the inner side surface of the connecting guard plate 4.

[0023] Preferably, when the connecting column 12 is inserted into the connecting rod 3, a piston-like structure is formed.

[0024] Preferably, the sleeve structure 14 is composed of a liquid injection pipe 9, a lead-out pipe 10, a grouting pipe 8 and a slurry guiding channel 7.

[0025] Preferably, the liquid injection pipe 9 is composed of a liquid injection main pipe 902 and liquid injection branch pipes 901. There are three liquid injection branch pipes 901 in total. The tails of the liquid injection branch pipes 901 are respectively connected to three hydraulic devices 5, and the heads are combined and connected into the liquid injection main pipe 902. The liquid injection branch pipes 901 and the liquid injection main pipe 902 are arranged in an umbrella shape. The diameter of the liquid injection branch pipe 901 is 1 / 3 of the diameter of the liquid injection main pipe 902.

[0026] Preferably, the lead-out pipe 10 is composed of a lead-out main pipe 102 and lead-out branch pipes 101. There are three lead-out branch pipes 101 in total. The three lead-out branch pipes 101 are respectively connected to three hydraulic devices 5, and the heads are combined and connected into the lead-out main pipe 102. The lead-out branch pipes 101 and the lead-out branch pipes 101 are arranged in an umbrella shape. The diameter of the lead-out branch pipe 101 is 1 / 3 of the diameter of the lead-out main pipe 102. The diameter of the lead-out main pipe 102 is 1 / 2 of the diameter of the liquid injection branch pipe 901.

[0027] Preferably, the grouting pipe 8 is sleeved on the liquid injection main pipe 902 and the lead-out main pipe 102, and the bottom of the grouting pipe 8 is connected to the slurry guiding channel 7.

[0028] Preferably, the tail end of the slurry guiding channel 7 is connected into the connecting guard plate 4, and the head end of the slurry guiding channel 7 is connected to the grouting pipe 8.

[0029] Next, the application of the present invention will be elaborated in detail with reference to the Figures 1-3 description of the drawings:

[0030] First, for the self-assembly of the present invention, since the self-weight of the load cell is relatively large, it often needs to be used in cooperation with a hoisting device. Therefore, a lifting ring 17 is provided at the top of the upper panel 11 of the present invention. When self-assembling the present invention, it is necessary to align the hydraulic tank 15 and the connecting column 12 below the upper panel 11 with the hydraulic device 5 and the connecting rod 3 on the lower panel 1 respectively, insert the upper threaded fixing rod into the connecting through hole 16, and then fix the upper panel 11 and the lower part by screwing a nut onto the upper threaded fixing rod. At this time, the self-assembly of the present invention is completed.

[0031] Next is the assembly of the present invention with the pile foundation steel reinforcement cage. At this time, it is necessary to thread the connecting steel bars of the steel reinforcement cage in advance, and then screw the threaded steel bars into the steel bar connectors 13 at the top of the upper panel 11 and the bottom of the lower panel 1. The steel bars at other positions can be strengthened by welding or not welded. At this time, the assembly of the present invention and the pile foundation cage is completed, and then the debugging of the present invention is carried out. After the debugging is completed, the pipeline can be docked with the casing structure 14. When docking, three pipelines are respectively taken and connected to the liquid injection main pipe 902, the lead-out main pipe 102, and the grouting pipe 8. At this time, the final assembly before the pile foundation pouring of the present invention is completed.

[0032] Finally, the use of the present invention. When the present invention is used, different functions are implemented through three externally connected pipelines. The pipeline connected to the liquid injection main pipe 902 mainly provides hydraulic fluid for the hydraulic device 5. The pipeline connected to the lead-out main pipe 102 is mainly used to drain the hydraulic fluid in the hydraulic device 5 after the detection is completed. The pipeline connected to the grouting pipe 8 is mainly used to pour concrete slurry into the present invention (including: in the hydraulic device 5, in the connecting guard plate 4, and in the load box area enclosed by the connecting guard plate 4) after the detection is completed. When the detection of the present invention is completed, first, cement mortar is poured into the hydraulic device 5 through the pipeline connected to the hydraulic main pipe, and at the same time, the hydraulic fluid in the hydraulic device 5 is extracted through the pipeline connected to the lead-out main pipe 102. When the continuous cement mortar is extracted through the pipeline connected to the lead-out main pipe 102, it proves that the hydraulic fluid in the hydraulic device 5 is emptied. At this time, the grouting can be started through the pipeline connected to the grouting pipe 8 into the interior of the present invention. After the injected concrete slurry is formed, the present invention is integrated with the pile foundation pouring.

[0033] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Those familiar with this technology can modify or improve the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A new type of load box, characterized in that The load cell is composed of an upper panel, a lower panel, a hydraulic device and a casing structure. Reinforcing bar connectors are provided at the top of the upper panel and the bottom of the lower panel. A hydraulic groove and a connecting column are provided below the upper panel. A grouting through hole is provided in the middle of the upper panel. Three connecting through holes and lifting rings are provided on the top of the upper panel. A connecting rod, an upper threaded retaining rod and a connecting guard plate are provided on the lower panel. There are three groups of hydraulic devices, and the three groups of hydraulic devices are equidistantly installed on the lower panel in a "pin" shape. The casing structure is installed in the middle of the lower panel, and the casing structure is respectively connected to the hydraulic device and the connecting guard plate.

2. A new type of load box according to claim 1, characterized in that The connecting guard plate connects the three hydraulic devices, and a grouting opening is provided on the inner side of the connecting guard plate.

3. A new type of load box according to claim 1, characterized in that When the connecting column is inserted into the connecting rod, a piston-like structure is formed.

4. A new type of load box according to claim 1, characterized in that The casing structure is composed of a liquid injection pipe, an extraction pipe, a grouting pipe and a slurry guiding channel.

5. A new type of load box according to claim 4, characterized in that The liquid injection pipe is composed of a liquid injection main pipe and liquid injection branch pipes. There are three liquid injection branch pipes in total. The tail ends of the liquid injection branch pipes are respectively connected to the three groups of hydraulic devices, and the heads are merged and connected into the liquid injection main pipe. The liquid injection branch pipes and the liquid injection main pipe are arranged in an umbrella shape. The diameter of the liquid injection branch pipe is 1 / 3 of the diameter of the liquid injection main pipe.

6. A new type of load box according to claim 4, characterized in that The extraction pipe is composed of an extraction main pipe and extraction branch pipes. There are three extraction branch pipes in total. The three extraction branch pipes are respectively connected to the three groups of hydraulic devices, and the heads are merged and connected into the extraction main pipe. The extraction branch pipes and the extraction main pipe are arranged in an umbrella shape. The diameter of the extraction branch pipe is 1 / 3 of the diameter of the extraction main pipe. The diameter of the extraction main pipe is 1 / 2 of the diameter of the liquid injection branch pipe.

7. A new type of load box according to claim 4 or 5, characterized in that The grouting pipe is sleeved on the liquid injection main pipe and the extraction main pipe, and the bottom of the grouting pipe is connected to the slurry guiding channel.

8. A new type of load box according to claim 4, characterized in that The tail end of the slurry guiding channel is connected to the connecting guard plate, and the head end of the slurry guiding channel is connected to the grouting pipe.

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