Inner soil plug measuring device for suction type foundation construction

Abstract

The utility model discloses an inner soil plug measuring device for suction type foundation construction, which comprises a measuring device and a structural bottom plate, the measuring device is fixedly arranged on the structural bottom plate, the measuring device adopts a compression spring to abut against a displacement sensor shaft, the upper end of the measuring device is provided with a limiting structure, and the bottom of the measuring device is provided with an annular trigger plate. When a soil plug bulges during construction in the suction type foundation, the trigger plate is pushed upwards by a soil body, so that the sensor rod moves in the guide sleeve, and the installed equipment detects the bulging degree of the internal soil body. Through mechanical triggering, high reliability and stable precision of the detection device are ensured. The whole equipment is well sealed, silt and other impurities are prevented from entering the equipment, and the equipment can be used for a long time and is safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of marine engineering construction, in particular to an internal soil plug measuring device for suction type foundation construction. Background Art

[0002] Suction foundations are widely used to anchor marine engineering structures such as offshore platforms and offshore wind power generation. Suction anchors or suction piles are inverted barrel structures with an opening at the bottom. The suction foundation forms negative pressure by pumping out the internal seawater, and is smoothly sunk and installed into the seabed foundation. However, when the internal water is pumped out for suction penetration, the water in the soil inside the suction foundation is squeezed out, and the loose soil will produce a bulge in the middle to form a soil plug. As the penetration depth increases, the height of the soil plug gradually increases with the penetration depth. When the height of the soil plug is greater than the allowable value, the suction foundation will not be able to sink to the designed predetermined position, thereby affecting the bearing capacity of the foundation and the stability of the superstructure. Since the changes in the water plug and soil plug inside the suction foundation cannot be directly observed and their height cannot be measured, the formed soil plug restricts construction.

[0003] In order to solve the above problems, we proposed an internal soil plug measurement device for suction foundation construction. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a suction type soil plug measuring device for foundation construction, and the utility model provides the following technical solutions:

[0005] A soil plug measuring device for suction-type foundation construction comprises a measuring device and a structural base plate, wherein the measuring device is fixedly mounted on the structural base plate, the measuring device consists of a mounting base, a guide sleeve, a measuring rod assembly and a position sensor, the mounting base is welded and mounted at the center of the structural base plate, the mounting base is connected to the bottom flange of the guide sleeve by means of a fastening screw, the measuring rod assembly is axially penetrated by the guide sleeve, a touch plate is provided at the lower end of the measuring rod assembly, and an upper limit is provided at the upper end, the position sensor is coaxially mounted inside the guide sleeve, and annularly mounted outside the measuring rod assembly.

[0006] Preferably, a base sealing ring is arranged in the flange sealing groove at the lower end of the guide sleeve, and an axial sealing ring is arranged in the open ring groove at the upper end of the guide sleeve.

[0007] Preferably, a spring base is sleeved on the axis of the measuring rod assembly, and a compression spring is coaxially installed on the spring base. The lower end of the compression spring is close to the spring base, and the upper end is pressed on the inner top of the guide sleeve.

[0008] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0009] This patent uses a compression spring to support the displacement sensor shaft, with a limited structure at the upper end and an annular trigger plate at the bottom. When soil bulges during construction in the suction foundation, the trigger plate is pushed upward by the soil, causing the sensor rod to move in the guide sleeve, and the installed equipment detects the degree of internal soil bulging; through mechanical triggering, the reliability of the detection device is ensured to be strong and the accuracy is stable; this patent has good sealing, which can effectively prevent impurities such as mud and sand from entering the interior of the equipment, and is suitable for long-term use, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used to illustrate the purpose of the preferred embodiment and are not considered to be limitations of the present invention. In the entire drawings, the same reference numerals are used to represent the same parts.

[0011] In the attached picture:

[0012] Figure 1 This is a schematic diagram of the overall installation of a preferred embodiment of the utility model;

[0013] Figure 2 It is a schematic diagram of the composition of a preferred embodiment of the utility model.

[0014] in, Figure 1~2 The corresponding relationship between the reference numerals and the components is as follows:

[0015] 1. Measuring device; 11. Mounting base; 12. Fastening screws; 13. Base sealing ring; 14. Spring base; 15. Compression spring; 16. Guide sleeve; 17. Axial sealing ring; 18. Measuring rod assembly; 181. Upper limit; 182. Touch plate; 19. Position sensor; 2. Structural base plate. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0017] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0018] Combine the following Figure 1~2 A suction-type soil plug measuring device for foundation construction according to an embodiment of the utility model is specifically described.

[0019] like Figure 1~2 As shown, the internal soil plug measuring device is fixed on the structural base plate 2 of the suction foundation, and uses an elastic telescopic rod to move inside the sensor to detect the degree of internal soil bulging. The measuring device 1 consists of a mounting base 11, a guide sleeve 16, a measuring rod assembly 18 and a position sensor 19.

[0020] The mounting base 11 is a ring plate cut from a steel plate of a certain thickness, fixed to the structural base plate 2 by welding, and is the base of the entire device. A threaded blind hole is processed on the circumference of the steel plate, and its position is aligned with the connection flange hole of the base of the guide sleeve 16, so that the fastening screw 12 can pass through and connect to the installation. The fastening screw 12 is made of stainless steel or a screw with an anti-corrosion coating, and is screwed into the threaded hole of the mounting base 11 through the connection flange hole of the base of the guide sleeve 16 to fix the guide sleeve 16 to the mounting base 11. According to the needs of use, there can also be flat washers, anti-loosening washers, etc. to further improve the stability of the threaded connection.

[0021] The guide sleeve 16 is a steel cylinder, and a sealing groove is provided at the bottom of the lower connecting flange to meet the installation requirements of the base sealing ring 13. The fastening screws 12 are passed through the flange bolt holes and screwed into the threaded holes of the mounting base 11 to squeeze the base sealing ring 13 to form a seal to prevent external mud and sand from entering the cylinder. The guide sleeve 16 is wrapped in the middle cylinder body to compress the spring 15 to protect it from being damaged by external forces. A small hole is provided at the upper end of the guide sleeve 16 to meet the movement of the measuring rod assembly 18 relative to the axial direction of the guide sleeve 16. Two ring grooves are also processed at the contact position to install the axial sealing ring 17. The axial sealing ring 17 is a rubber ring installed in the upper end hole of the guide sleeve 16. A Y-type or X-type sealing ring is used to isolate external foreign matter from entering when the measuring rod assembly 18 moves up and down, thereby protecting the compression spring 15, position sensor 19 and other precision components for safe use.

[0022] The measuring rod assembly 18 is a slender shaft with an annular touch plate 182 at the lower end and an upper limit 181 at the upper end. An axial device that meets the position signal triggering of the position sensor 19 is installed inside. There is a spring base 14 fixed in the middle by tensioning or clamping. The lower touch plate 182 is fixed at the lower part by welding. After touching the soil plug, it moves upward. It is made by cutting thin plates and has a certain area to reduce the squeezing of the soil plug and measure the height of the soil plug more accurately. The upper limit 181 is connected to the upper end of the measuring rod assembly 18 by a threaded connection or a clamping structure, which is convenient for installation and operation. According to the construction requirements, the measuring stroke is different, and the length of the measuring rod assembly 18 used is different. At the same time, the corresponding length of the compression spring 15 and the height of the guide sleeve 16 are adjusted to be consistent.

[0023] The compression spring 15 is coaxially installed in the annulus of the guide sleeve 16 and the measuring rod assembly 18. It is made of stainless steel, with the lower end close to the spring base 14 and the upper end pressed on the top of the guide sleeve 16. When the touch plate 182 is lifted by the soil plug of the suction foundation, the spring base 14 moves upward with the measuring rod assembly 18, and the compression spring 15 is compressed. On the contrary, the spring presses the spring base 14 close to the installation base 11, so that the measuring rod assembly 18 does not move. The spring base 14 is a ring of a certain thickness made of metal material. The inner hole is close to the shaft of the measuring rod assembly 18. It is fixed to the set position of the measuring rod assembly 18 by tightening or ferrule, so that the touch plate 182 extends to the required height. The spring base 14 supports the compression spring 15 coaxially installed thereon. The outer diameter is slightly smaller than the inner hole of the guide sleeve 16, and it will not scratch the inner hole of the guide sleeve 16 when the measuring rod assembly 18 moves up and down.

[0024] The position sensor 19 is a magnetostrictive displacement sensor or a sensor that can detect the moving position of the measuring rod assembly 18 relative to the guide sleeve 16. It is coaxially installed inside the guide sleeve 16 and is ringed on the outside of the measuring rod assembly 18. The detected signal can be transmitted to the receiving device at the construction site through a cable or wirelessly, indicating the distance between the touch panel 182 and the structural base plate 2, that is, the height of the soil plug uplift.

[0025] Specific implementation steps

[0026] Step 1: Determine the measuring height of the measuring device based on the calculation and analysis of the possible soil plug height and soil composition in the suction foundation, complete the height determination of the guide sleeve 16, measuring rod assembly 18, and position sensor 19, and complete the parts production and standard parts procurement according to the drawing requirements.

[0027] Step 2: Insert the axial sealing ring 17 into the installation groove at the upper end of the guide sleeve 16, and install the position sensor 19 inside the upper end of the guide sleeve 16. Insert the measuring rod assembly 18 with the touch plate 182 installed from the hole of the mounting base 11, insert the base sealing ring 13, spring base 14 and compression spring 15 in sequence, press the compression spring 15 to a certain length, clamp the spring base 14 on the measuring rod assembly 18, install the upper limit 181 after the measuring rod assembly 18 comes out, and then screw the fastening screw 12 through the flange bolt hole into the threaded hole of the mounting base 11, squeeze the base sealing ring 13 to form a seal, and the measuring device 1 is assembled.

[0028] Step 3: calibrate the position sensor 19 of the assembled measuring device 1 to zero, install it on the structural base plate 2 of the suction foundation, insert the touch panel 182 into the interior of the foundation structure, weld the mounting base 11 to the structural base plate 2, and connect the signal cable of the position sensor 19 to the outside.

[0029] Step 4: Suction foundation installation is performed at sea. After sinking to a certain depth, the soil plug inside the foundation barrel bulges, pushing the touch plate 182 upward. At this time, the position sensor 19 displays the moving distance, and the height of the soil plug is measured in combination with the suction foundation mud depth monitored by the sinking system. After detecting the height of the soil plug, different sinking operations can be used according to the different heights of the soil plug, and finally the suction foundation is penetrated into place with the minimum influence of the soil plug.

[0030] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A soil plug measuring device for suction-type foundation construction, comprising a measuring device (1) and a structural base plate (2), characterized in that: The measuring device (1) is fixedly mounted on the structural base plate (2). The measuring device (1) is composed of a mounting base (11), a guide sleeve (16), a measuring rod assembly (18) and a position sensor (19). The mounting base (11) is welded and mounted at the center of the structural base plate (2). The mounting base (11) is connected to the bottom flange of the guide sleeve (16) via a fastening screw (12). The measuring rod assembly (18) is axially penetrated by the guide sleeve (16). The measuring rod assembly (18) is provided with a touch plate (182) at the lower end and an upper limit position (181) at the upper end. The position sensor (19) is coaxially mounted inside the guide sleeve (16) and annularly mounted outside the measuring rod assembly (18).

2. The suction-type soil plug measuring device for foundation construction according to claim 1, characterized in that: A base sealing ring (13) is arranged in the flange sealing groove at the lower end of the guide sleeve (16), and an axial sealing ring (17) is arranged in the hole ring groove at the upper end of the guide sleeve (16).

3. The suction-type soil plug measuring device for foundation construction according to claim 1, characterized in that: A spring base (14) is sleeved on the axis of the measuring rod assembly (18), and a compression spring (15) is coaxially mounted on the spring base (14). The lower end of the compression spring (15) is closely attached to the spring base (14), and the upper end is pressed against the inner top of the guide sleeve (16).

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