A locking plugging structure, a steel pipe pile and a pile foundation construction method

Abstract

The present application relates to the technical field of pile foundation construction, and particularly relates to a lock catch plugging structure, a steel pipe pile and a pile foundation construction method, wherein the lock catch plugging structure comprises a plugging head, the plugging head is used for being connected with one end of a first lock catch of the steel pipe pile, and the plugging head can seal the opening of the corresponding end of the first lock catch; a plugging strip is used for being detachably connected inside the first lock catch, the length of the plugging strip is greater than or equal to the length of a side installation groove of the first lock catch, and the plugging strip can seal the side installation groove. The present application can overcome the technical problems in the prior art, such as the step-by-step construction of the steel pipe pile and the steel sheet pile, the first lock catch being easily blocked by mud and sand, and the construction difficulty of the steel sheet pile and the decline of the construction quality.

Description

Technical Field

[0001] This invention relates to the field of pile foundation construction technology, and in particular to a locking and sealing structure, steel pipe piles, and a pile foundation construction method. Background Technology

[0002] In port and hydraulic engineering, pipe-sheet composite structures are commonly used as pile foundations. These structures consist of several spaced steel pipe piles and sheet piles positioned between adjacent pipe piles. Each pipe pile has a first locking mechanism running along its length. The first locking mechanism has openings at both ends along the length of the pile, and a side mounting groove runs along the radial direction closer to the pile. The sheet piles also have corresponding second locking mechanisms on both sides. During construction, the pipe piles are driven to a specified depth, and the second locking mechanism is inserted into the first locking mechanism from its upper opening. The sheet piles are then driven, allowing them to move downwards along the side mounting grooves until they reach the predetermined depth. This interlocking connection method provides good guidance for the subsequently constructed sheet piles and ensures a tight fit between the sheet piles and pipe piles, making it suitable for foundation construction under various complex geological conditions.

[0003] However, during the initial installation of steel pipe piles, underground debris such as mud, sand, and gravel can flow into the first locking buckle through the lower opening and side mounting groove, causing blockage. This can lead to problems such as difficulty in inserting the second locking buckle into the first locking buckle, increased resistance in the driving of the sheet pile, increased deviation in the sheet pile position, and even locking buckle detachment. These issues negatively impact both the construction progress and the construction quality. Therefore, there is an urgent need to develop a device that can temporarily seal the first locking buckle during the construction of steel pipe piles. Summary of the Invention

[0004] The purpose of this invention is to overcome the technical problem in the prior art where the first locking buckle is easily blocked by mud and sand during the step-by-step construction of steel pipe piles and steel sheet piles, which leads to difficulties in steel sheet pile construction and a decline in construction quality. The invention provides a locking buckle sealing structure, a steel pipe pile and a pile foundation construction method.

[0005] In a first aspect, the present invention provides a locking and sealing structure, comprising:

[0006] The sealing head is used to connect to one end of the first locking buckle of the steel pipe pile, and the sealing head can seal the opening at the corresponding end of the first locking buckle; A sealing strip is used to detachably connect to the inside of the first latch. The length of the sealing strip is greater than or equal to the length of the side mounting groove of the first latch, and the sealing strip can seal the side mounting groove.

[0007] Preferably, the sealing strip includes a first liquid bladder, the length of which is greater than or equal to the length of the side mounting groove. The end of the first liquid bladder away from the sealing head is provided with an injection port. Adding liquid to the first liquid bladder can cause it to expand, thereby sealing the side mounting groove.

[0008] Preferably, the sealing strip further includes a shovel block, which is connected to the side of the first liquid bladder facing the side mounting groove. The width of the shovel block along the width direction of the first liquid bladder is W, and W decreases as it moves away from the first liquid bladder along the thickness direction of the first liquid bladder.

[0009] Preferably, the end of the shovel block away from the sealing head is provided with a shovel slope, one end of the shovel slope along the width direction of the first liquid bladder is farther away from the sealing head than the other end, and the end of the shovel slope along the thickness direction of the first liquid bladder is closer to the first liquid bladder than the other end is farther away from the sealing head.

[0010] Preferably, the number of shovel blocks is at least two, and the shovel blocks are distributed at intervals along the length direction of the first liquid bladder.

[0011] Preferably, the end of the sealing head near the sealing strip is detachably connected to the sealing strip.

[0012] Preferably, a second liquid bladder is provided at one end of the sealing strip near the sealing head, and at least two latches are provided at intervals along the circumference of the second liquid bladder; a locking hole is provided at one end of the sealing head near the sealing strip, and the second liquid bladder can be inserted into the locking hole; a slot is provided on the side wall of the locking hole facing the second liquid bladder, and adding or removing liquid into the second liquid bladder can cause the second liquid bladder to expand or contract, thereby driving the latches to insert into or leave the slot.

[0013] Preferably, the sealing head is also provided with a guide slope on the side closer to the side mounting groove along the thickness direction of the sealing strip, and the thickness of the guide slope along the thickness direction of the sealing strip is larger as it gets closer to the sealing strip.

[0014] In a second aspect, the present invention provides a steel pipe pile, including a pile body and a first locking buckle, wherein the first locking buckle has openings at both ends along the axial direction of the pile body, and the first locking buckle has a side mounting groove provided on the side of the pile body closer to the pile body along the radial direction, and also includes a locking buckle sealing structure of the present invention.

[0015] In a third aspect, the present invention provides a pile foundation construction method, applied to a locking and sealing structure of the present invention, comprising the following steps: S1. Place the steel pipe pile at the designated location, install a sealing head at the lower end of the first lock, and install a sealing strip inside the first lock; drive the steel pipe pile into the ground to the designated depth. S2. Remove the sealing strip from the top of the first latch; S3. Insert the second locking buckle of the sheet pile into the first locking buckle and drive the sheet pile into the ground.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a locking and sealing structure, which uses a sealing strip and a sealing head to seal the side mounting groove and the lower opening of the first locking, respectively. This prevents mud and sand from entering the first locking from the lower opening or the side mounting groove during the driving of steel pipe piles, thereby avoiding the obstruction of the steel sheet pile's guidance and driving operation by mud and sand, and thus improving the construction efficiency and quality of the steel sheet pile.

[0017] 2. This invention provides a steel pipe pile that can use a locking and sealing structure to prevent mud and sand from entering the first locking, thereby improving the construction efficiency and quality of subsequent steel sheet piles.

[0018] 3. This invention provides a pile foundation construction method that uses a locking and sealing structure to prevent mud and sand from entering the first locking, thereby improving the construction efficiency and quality of sheet piles. Attached Figure Description

[0019] Figure 1 This is a top view schematic diagram of the locking and sealing structure of the present invention when it is installed on a steel pipe pile; Figure 2 This is a partial top sectional view of the locking and sealing structure of the present invention at the sealing head; Figure 3 This is a partial top sectional view of the locking and sealing structure of the present invention at the second liquid bladder; Figure 4 This is a partial three-dimensional structural diagram of a locking and sealing structure at the first locking point of the present invention; Figure 5 This is a partial front sectional view of the locking and sealing structure of the present invention at the first locking point; Figure 6 This is a partial side sectional view of the locking and sealing structure of the present invention at the first locking point; Figure 7 This is a partially enlarged side sectional view of the locking and sealing structure of the present invention at the tenon. Figure 1 ; Figure 8 This is a partially enlarged side sectional view of the locking and sealing structure of the present invention at the tenon. Figure 2 ; Figure 9 This is a partially enlarged three-dimensional exploded view of the latching and sealing structure of the present invention at the tenon; icon: 1-Sealing head; 11-Guide slope; 12-Connecting boss; 13-Slot; 21-First liquid bladder; 22-Shovel block; 23-Shovel slope; 24-Second liquid bladder; 25-Clamping tenon; 3-Steel pipe pile; 31-First locking; 4-Sheet pile; 41-Second locking. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0021] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0022] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0023] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0024] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0025] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0026] Example 1 like Figures 1 to 9 As shown, a locking and sealing structure includes a sealing head 1 and a sealing strip; the sealing head 1 is used to connect to one end of the first locking 31 of the steel pipe pile 3, and the sealing head 1 can seal the opening at the corresponding end of the first locking 31; the sealing strip is used to be detachably connected to the inside of the first locking 31, and the length of the sealing strip is greater than or equal to the length of the side mounting groove of the first locking 31, and the sealing strip can seal the side mounting groove, thereby preventing mud and sand from entering the first locking 31 from the side mounting groove.

[0027] exist Figures 1 to 9 The diagram also uses a Cartesian coordinate system to label each direction, where the X-axis represents the width of the first liquid bladder 21, which is also the thickness direction of the sealing strip; the Y-axis represents the thickness direction of the first liquid bladder 21; and the Z-axis represents the length direction of the first liquid bladder 21. It should be noted that... Figure 1 The steel pipe pile 3 is connected to the steel sheet pile 4 on one side and the sealing strip on the other side. This is only to facilitate showing the connection position of the steel sheet pile 4 and the sealing strip in one diagram, and is not intended to limit the actual working or construction state of this locking and sealing structure. Figures 4 to 9 In order to more clearly show the structure of the sealing head 1 and the sealing strip, the steel pipe pile 3 was hidden.

[0028] When constructing the steel pipe pile 3, the sealing strip is inserted into the first locking buckle 31. The sealing strip can occupy most of the space inside the first locking buckle 31 in advance and seal the opening of the side mounting groove. This can block the mud and sand during the driving of the steel pipe pile 3, preventing the mud and sand from entering the first locking buckle 31 from the lower opening or the side mounting groove.

[0029] However, when the steel pipe pile 3 is driven, the soil will exert an upward reaction force on the sealing strip. The sealing strip, which is detachably connected to the inside of the first locking buckle 31, may be displaced upward under the action of the soil reaction force, resulting in misalignment between the sealing strip and the side mounting groove, and thus causing the bottom sealing of the side mounting groove to fail. Therefore, this locking buckle sealing structure also provides a sealing head 1 at the lower end of the sealing strip. On the one hand, the sealing head 1 can directly seal the bottom of the first locking buckle 31, improving the sealing effect of this locking buckle sealing structure on the first locking buckle 31. On the other hand, the sealing head 1 can also replace the sealing strip to bear part of the soil reaction force, thereby reducing the probability of the sealing strip being displaced under the action of the soil reaction force and causing local sealing failure.

[0030] Once the steel pipe pile 3 is driven to the designated depth, the sealing strip is pulled out from the upper end of the first locking clip 31, thus re-exposing the upper opening and side mounting groove of the first locking clip 31. This allows for the subsequent construction of the steel sheet pile 4 to proceed according to conventional procedures. As mentioned above, since the sealing head 1 and the sealing strip block the mud and sand during the driving of the steel pipe pile 3, this locking and sealing structure ensures that there is almost no mud and sand inside the first locking clip 31 during the construction of the steel sheet pile 4, or only a small amount of mud and sand that falls back into the first locking clip 31 after the sealing strip is pulled out. This avoids the mud and sand from hindering the guidance and driving operation of the steel sheet pile 4, thereby improving the construction efficiency and quality of the steel sheet pile 4.

[0031] The length of the sealing strip is greater than or equal to the length of the side mounting groove of the first latch 31. On the one hand, it can ensure that the sealing strip forms a complete blockage of the side mounting groove along the length direction of the side mounting groove. On the other hand, it can also ensure that the end away from the sealing head 1 is at least flush with the upper end of the first latch 31, or protrude from the end of the first latch 31, so as to facilitate the subsequent removal of the sealing strip from the upper opening of the first latch 31.

[0032] In an optional embodiment, the length of the sealing strip exceeds the length of the first latch 31 by at least 2m.

[0033] In optional embodiments, the specific structure of the sealing head 1 includes, but is not limited to, a baffle, a block or a pin. The connection method between the sealing head 1 and the first latch 31 includes, but is not limited to, plug-in connection, welding connection, threaded connection or tenon and mortise connection. The material of the sealing head 1 includes, but is not limited to, metal, rubber, plastic or wood, as long as the sealing head 1 can seal the lower end of the first latch 31. For example, a short steel bar can be welded directly to the lower end of the first latch 31 or a wooden wedge can be inserted as the sealing head 1.

[0034] In optional embodiments, the specific structure of the sealing strip includes, but is not limited to, rigid rods or flexible ropes. The detachable connection between the sealing strip and the first locking buckle 31 includes, but is not limited to, plug-in connection, magnetic connection or tenon connection. The material of the sealing strip includes, but is not limited to, metal, rubber, plastic or wood. As long as the sealing strip has sufficient length to seal the entire side mounting groove and can be pulled out from the first locking buckle 31 before driving the sheet pile 4, for example, a steel wire rope or steel rod can be directly inserted into the first locking buckle 31 as a sealing strip.

[0035] In an optional embodiment, the outer surface of the sealing strip is a smooth surface, for example, the surface roughness Ra is less than or equal to 3.2 micrometers, so as to reduce the friction between the sealing strip and the inner wall of the first latch 31, making it easier for the sealing strip to be pulled out from the first latch; for example, when the sealing strip is made of steel wire rope, a variable amplitude steel wire rope or a steel wire rope with a polished outer surface can be used.

[0036] In an optional embodiment, the sealing strip includes a first liquid bladder 21. The length of the first liquid bladder 21 is greater than or equal to the length of the side mounting groove. The end of the first liquid bladder 21 away from the sealing head 1 is provided with an injection port. Adding liquid to the first liquid bladder 21 can cause the first liquid bladder 21 to expand, thereby sealing the side mounting groove.

[0037] In this embodiment, the first liquid bladder 21 is used as the main structure of the sealing strip. After liquid is added into the first liquid bladder 21, the first liquid bladder 21 can expand within the first latch 31 and automatically adapt to the cross-sectional shape of the internal channel of the first latch 31, thereby occupying as much internal space as possible in the first latch 31, which is beneficial to achieving a better mud and sand sealing effect. When it is necessary to install or remove the first liquid bladder 21, the volume of the first liquid bladder 21 can be reduced by draining the liquid inside the first liquid bladder 21, thereby reducing the friction between the first liquid bladder 21 and the inner wall of the first latch 31, and thus speeding up the installation or removal speed of the first liquid bladder 21.

[0038] In an optional embodiment, the liquid filled in the first liquid sac 21 includes, but is not limited to, water or oil.

[0039] In an optional embodiment, a lifting ring is provided at the end of the first liquid bladder 21 away from the sealing head 1, so that a hook can be connected later to remove the first liquid bladder 21.

[0040] In an optional embodiment, the sealing strip further includes a spade block 22, which is connected to the side of the first liquid bladder 21 facing the side mounting groove (e.g., Figure 5The width of the shovel block 22 along the width direction of the first liquid bladder 21 is W. The width of W along the thickness direction of the first liquid bladder 21 is smaller as it moves away from the first liquid bladder 21. The W of the shovel block 22 at the end away from the first liquid bladder 21 is less than the width of the side mounting groove, and the W of the shovel block 22 at the end closer to the first liquid bladder 21 is greater than the width of the side mounting groove.

[0041] Although the first liquid bladder 21 can effectively prevent mud and sand from entering the first locking buckle 31, due to the thickness of the side mounting groove, some mud and sand will accumulate in the side mounting groove. When the first liquid bladder 21 is pulled out during subsequent construction, this mud and sand is likely to fall back into the first locking buckle 31 due to loss of support, which will have a certain impact on the subsequent construction of the sheet pile 4.

[0042] Therefore, in this embodiment, a spade block 22 is provided on one side of the first liquid bladder 21, and the width of the spade block 22 decreases as it moves further away from the first liquid bladder 21; when the first liquid bladder 21 expands, such as Figure 3 As shown, the shovel block 22 will be pressed against the side mounting groove by the liquid pressure inside the first liquid bladder 21, and the end of it away from the first liquid bladder 21 will extend a certain distance from the side mounting groove. When subsequent construction requires pulling out the first liquid bladder 21 along the length of the first latch 31, the shovel block 22 can move along the length of the side mounting groove together with the first liquid bladder 21, thereby removing the mud and sand accumulated in the side mounting groove and preventing this mud and sand from falling back into the first latch 31 after the first liquid bladder 21 is pulled out.

[0043] In an optional embodiment, the included angle between the two sides of the shovel block 22 along the width direction of the first liquid bladder 21 matches the included angle between the two corresponding sides of the first latch 31, so that the two sides of the shovel block 22 can be aligned as follows: Figure 3 As shown, they are closely fitted to the two sides of the first latch 31, thereby further improving the sealing effect of this embodiment.

[0044] In an optional embodiment, the end of the shovel block 22 furthest from the sealing head 1 is provided with a soil-shoveling ramp 23, and one end of the soil-shoveling ramp 23 along the width direction of the first liquid bladder 21 is further away from the sealing head 1 than the other end, for example... Figure 6 As shown, the upper end of the shovel slope 23 along the X-axis is farther from the sealing head 1 than the lower end; the end of the shovel slope 23 closer to the first liquid bladder 21 along the thickness direction of the first liquid bladder 21 is farther from the sealing head 1 than the other end, for example... Figure 5 As shown, the lower end of the shovel slope 23 along the Y-axis is farther from the sealing head 1 than the upper end.

[0045] This embodiment can push the mud and sand accumulated in the side mounting groove away from the side mounting groove by the shovel slope 23. It can not only remove the mud and sand accumulated in the side mounting groove, but also make the soil at the opening of the side mounting groove more compact by squeezing the mud and sand, thereby further reducing the probability of the soil at the opening of the side mounting groove falling into the first lock 31. It is especially suitable for soft soil foundations in coastal areas and soft soil in nearshore environments.

[0046] In an optional embodiment, the number of shovel blocks 22 is at least two, and the shovel blocks 22 are distributed at intervals along the length direction of the first liquid bladder 21.

[0047] This solution uses at least two shovel blocks 22 to remove mud and sand from the side mounting groove in sections. On the one hand, it can reduce the soil pressure on each shovel block 22, thereby reducing the design difficulty of the connection structure between the shovel block 22 and the first liquid bladder 21, and reducing the risk of the shovel block 22 detaching from the first liquid bladder 21 due to excessive soil pressure. On the other hand, compared with setting a single strip shovel block 22 along the length of the first liquid bladder 21, setting the shovel blocks 22 at intervals can not only reduce the manufacturing cost of the shovel blocks 22, but also retain the bending ability of the first liquid bladder 21, which is conducive to the subsequent use of a winch to pull out the first liquid bladder 21.

[0048] In an optional embodiment, the end of the sealing head 1 near the sealing strip is detachably connected to the sealing strip, and the specific form includes, but is not limited to, threaded connection, magnetic connection or snap-fit ​​connection.

[0049] As mentioned above, when driving the steel pipe pile 3, the sealing strip will be subjected to an upward soil reaction force. Therefore, this embodiment recommends that the sealing strip and the sealing head 1 be detachably connected. When driving the steel pipe pile 3, the sealing strip and the sealing head 1 are connected together to prevent the sealing strip from shifting under the action of the soil reaction force. When it is necessary to pull out the sealing strip, the connection between the sealing strip and the sealing head 1 is released.

[0050] In an optional embodiment, a second liquid bladder 24 is provided at one end of the sealing strip near the sealing head 1, and at least two latches 25 are spaced apart circumferentially along the second liquid bladder 24; a locking hole is provided at one end of the sealing head 1 near the sealing strip, into which the second liquid bladder 24 can be inserted; a groove 13 is provided on the side wall of the locking hole facing the second liquid bladder 24; as shown Figure 8 As shown, adding liquid to the second liquid bladder 24 causes it to expand, thereby driving the latch 25 to insert into the slot 13, thus connecting the sealing strip to the sealing head 1; as Figure 7 As shown, extracting the liquid from the second liquid bladder 24 causes the second liquid bladder 24 to contract, thereby causing the latch 25 to leave the slot 13 and releasing the connection between the sealing strip and the sealing head 1.

[0051] Since the lower ends of the sealing head 1 and the sealing strip have been driven into the ground when the sealing strip needs to be disconnected and the sealing head 1 is pulled out, the connection or separation of the sealing strip and the sealing head needs to be remotely controlled. This embodiment provides one specific method of detachable connection between the sealing strip and the sealing head 1. The connection or separation of the sealing strip and the sealing head 1 can be achieved by pressurizing or depressurizing the second liquid bladder 24. The whole process does not require the participation of electronic components, which can reduce the manufacturing cost of this embodiment and improve the reliability of this embodiment.

[0052] In optional embodiments, the second liquid bladder 24 and the first liquid bladder 21 can be two independent liquid bladders, so as to control the expansion and contraction of the second liquid bladder 24 and the first liquid bladder 21 respectively; or they can be two parts on the same liquid bladder, so as to reduce the structural complexity of the sealing strip.

[0053] In an optional embodiment, the liquid filled in the second liquid sac 24 includes, but is not limited to, water or oil.

[0054] In optional implementations, such as Figure 9 As shown, there are two tenons 25, which can be assembled into a ring to hold the second liquid bladder 24. The two tenons 25 are slidably connected, for example, by a pin and a hole, so that the two tenons 25 can only move closer or further apart along a straight line. Compared with directly connecting the tenons 25 to the side wall of the flexible second liquid bladder 24, the direction of the tenon 25's freedom of movement is more defined in this embodiment, which can prevent irregular deformation of the liquid bladder from causing the tenon 25 to get stuck in the slot 13, thus preventing the sealing head 1 from being connected or separated from the sealing strip.

[0055] In an optional embodiment, an elastic element can be provided between two adjacent latches 25. The elastic element is used to pull the two adjacent latches 25 closer to each other, so that after the second liquid bladder 24 contracts, it can assist the two latches 25 to leave the slot 13 (i.e. reset), preventing the latches 25 from being unable to separate from the slot 13 due to the latches 25 being unable to reset, which in turn prevents the sealing strip from being pulled out.

[0056] In optional implementations, such as Figure 9 As shown, a circular connecting boss 12 is provided at one end of the sealing head 1 near the sealing strip, a locking hole is provided in the middle of the connecting boss 12, and a slot 13 passes through the side wall of the connecting boss 12; compared with directly machining the locking hole and slot 13 inside the sealing head 1, this embodiment can reduce the machining difficulty of the sealing head 1.

[0057] In optional implementations, such as Figure 9 As shown, the sealing head 1 is also provided with a guide slope 11 on the side closer to the side mounting groove along the thickness direction of the sealing strip. The thickness of the guide slope 11 along the thickness direction of the sealing strip is larger as it gets closer to the sealing strip.

[0058] The guide slope 11 of this embodiment can squeeze the soil away from the sealing strip. On the one hand, it can prevent the sealing strip from being directly squeezed by the soil, thereby further reducing the probability of the sealing strip being displaced due to the reaction force of the soil. On the other hand, the squeezing of the soil by the guide slope 11 can also increase the compaction of the soil at the side mounting groove, thereby further reducing the probability of mud and sand falling back into the first latch 31 after the sealing strip is pulled out.

[0059] In optional implementations, such as Figure 5 As shown, the guide slope 11 extends along the thickness direction of the sealing strip to the end face of the shovel block 22 that is away from the first liquid bladder 21 (i.e., the upper end face of the shovel block 22 along the Y-axis), so that the guide slope 11 can also protect the shovel block 22 and prevent the soil from directly squeezing the shovel block 22.

[0060] Example 2 A steel pipe pile 3 includes a pile body and a first locking buckle 31. The first locking buckle 31 has openings at both ends along the axial direction of the pile body. The first locking buckle 31 has a side mounting groove on the side closer to the pile body along the radial direction of the pile body. Any locking buckle sealing structure in Embodiment 1 is connected in the side mounting groove. The sealing head 1 is connected to the lower opening of the first locking buckle 31, and the sealing strip is inserted inside the first locking buckle 31.

[0061] Example 3 A pile foundation construction method, applied to a locking and sealing structure in Example 1, includes the following steps: S1. Place the steel pipe pile 3 at the designated position, install the sealing head 1 at the lower end of the first locking buckle 31, and install the sealing strip inside the first locking buckle 31; use a hydraulic hammer or vibratory hammer to drive the steel pipe pile 3 into the ground to the designated depth.

[0062] S2. Remove the sealing strip from the upper end of the first latch 31.

[0063] S3. Insert the second locking 41 of the sheet pile 4 into the first locking 31, and use a hydraulic hammer or vibratory hammer to drive the sheet pile 4 into the ground.

[0064] In an optional embodiment, when the sealing strip includes a first liquid bladder 21, in S1 the first liquid bladder 21 can be inserted into the first latch 31 first, and then liquid can be added into the first liquid bladder 21 to improve the installation efficiency of the first liquid bladder 21; correspondingly, in S2 when the sealing strip is removed, a portion of the liquid in the first liquid bladder 21 can be extracted to cause the first liquid bladder 21 to contract, thereby reducing the pulling force required to remove the first liquid bladder 21.

[0065] In an optional embodiment, when a second liquid bladder 24, a latch 25, a locking hole, and a slot 13 are also provided between the sealing strip and the sealing head 1, in S1, the second liquid bladder 24 and the latch 25 can be inserted into the locking hole first, and then liquid can be added into the second liquid bladder 24 to drive the latch 25 into the slot 13, thereby achieving a reliable connection between the sealing strip and the sealing head 1; correspondingly, in S2, when the sealing strip is removed, a portion of the liquid in the second liquid bladder 24 needs to be extracted first to drive the latch 25 away from the slot 13, thereby unlocking the sealing strip and the sealing head 1.

[0066] In an optional embodiment, when the sealing strip includes the first liquid bladder 21, the sealing strip can be pulled out of the first latch 31 by using a winch to wind the first liquid bladder 21 in S2.

[0067] In an optional implementation, when the sealing strip is pulled out in S2, in order to counteract the friction between the sealing strip and the inner wall of the first locking buckle 31, as well as the friction between the sealing strip and the soil, a pulling force of at least 6 tons is initially required, and then the pulling force is gradually reduced as the removal operation proceeds.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A locking and sealing structure, characterized in that, include: A plug (1) is used to connect to one end of the first latch (31) of the steel pipe pile (3), and the plug (1) can seal the opening at the corresponding end of the first latch (31); A sealing strip is used to be detachably connected to the inside of the first latch (31). The length of the sealing strip is greater than or equal to the length of the side mounting groove of the first latch (31). The sealing strip can seal the side mounting groove.

2. The locking and sealing structure according to claim 1, characterized in that, The sealing strip includes a first liquid bladder (21), the length of which is greater than or equal to the length of the side mounting groove. The end of the first liquid bladder (21) away from the sealing head (1) is provided with an injection port. Adding liquid to the first liquid bladder (21) can cause the first liquid bladder (21) to expand, thereby sealing the side mounting groove.

3. The locking and sealing structure according to claim 2, characterized in that, The sealing strip also includes a shovel block (22), which is connected to the side of the first liquid bladder (21) facing the side mounting groove. The width of the shovel block (22) along the width direction of the first liquid bladder (21) is W, and W is smaller the further away from the first liquid bladder (21) along the thickness direction of the first liquid bladder (21).

4. The locking and sealing structure according to claim 3, characterized in that, The shovel block (22) has a shovel slope (23) at one end away from the sealing head (1). One end of the shovel slope (23) along the width direction of the first liquid bladder (21) is farther away from the sealing head (1) than the other end. The end of the shovel slope (23) along the thickness direction of the first liquid bladder (21) is closer to the first liquid bladder (21) than the other end is farther away from the sealing head (1).

5. The locking and sealing structure according to claim 3, characterized in that, The number of the shovel blocks (22) is at least two, and the shovel blocks (22) are distributed at intervals along the length direction of the first liquid bladder (21).

6. A locking and sealing structure according to any one of claims 1 to 5, characterized in that, The end of the sealing head (1) near the sealing strip is detachably connected to the sealing strip.

7. The locking and sealing structure according to claim 6, characterized in that, The sealing strip is provided with a second liquid bladder (24) at one end near the sealing head (1), and at least two latches (25) are provided at intervals along the circumference of the second liquid bladder (24); the sealing head (1) is provided with a locking hole at one end near the sealing strip, and the second liquid bladder (24) can be inserted into the locking hole; a slot (13) is provided on the side wall of the locking hole facing the second liquid bladder (24), and adding or removing liquid into the second liquid bladder (24) can cause the second liquid bladder (24) to expand or contract, thereby driving the latches (25) to insert into or leave the slot (13).

8. A locking and sealing structure according to any one of claims 1 to 5, characterized in that, The sealing head (1) is also provided with a guide slope (11) on the side closer to the side mounting groove along the thickness direction of the sealing strip. The thickness of the guide slope (11) along the thickness direction of the sealing strip is larger as it gets closer to the sealing strip.

9. A steel pipe pile, comprising a pile body and a first locking buckle (31), wherein the first locking buckle (31) has openings at both ends along the axial direction of the pile body, and the first locking buckle (31) is provided with a side mounting groove along the radial direction of the pile body closer to the pile body, characterized in that, It also includes a locking and sealing structure as described in any one of claims 1 to 8.

10. A method for constructing pile foundations, characterized in that, A locking and sealing structure applied to claims 1 to 8 includes the following steps: S1. Place the steel pipe pile (3) at the designated position, install the sealing head (1) at the lower end of the first lock (31), and install the sealing strip inside the first lock (31); drive the steel pipe pile (3) into the ground to the designated depth; S2. Remove the sealing strip from the upper end of the first latch (31); S3. Insert the second locking (41) of the sheet pile (4) into the first locking (31) and drive the sheet pile (4) into the ground.

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