A double-layer steel casing leak-proof device for pile foundation

Abstract

This invention relates to the field of engineering construction technology, specifically disclosing a double-layer steel casing anti-leakage device for pile foundations, comprising: a rubber ring fitted on the inner casing, and a support structure for supporting the rubber ring. The rubber ring is conical in shape, and its inner edge is attached to and fixed to the inner casing. The support structure includes: multiple rotating rods, arranged below the rubber ring and hinged to the inner casing, and arranged in a circumferential array around the axis of the inner casing; and a support ring composed of at least two arc-shaped rods made of elastic metal, which pass through the outer ends of the rotating rods. When the two layers of steel casings are aligned, a driving component drives the rolled edge ring to descend, thereby causing the outer edge of the rubber ring to fold downward to form a folded edge. As the rolled edge ring continues to descend, the locking component opens, causing all the arc-shaped rods to slide away from each other, and the support ring enlarges to press against the folded edge, so that the other side of the folded edge presses against the inner wall of the outer casing.

Description

Technical Field

[0001] The invention relates to the technical field of engineering construction, and in particular to a double-layer steel casing leakage prevention device for a pile foundation. Background Art

[0002] In modern construction projects, especially in bridge construction and foundation construction of large high-rise buildings, pile foundation construction is an extremely critical link. The stability and reliability of the pile foundation are directly related to the safety and service life of the entire building structure. In the process of pile foundation construction, the application of steel casing plays an indispensable role. For example, in sand layers rich in groundwater and silty soil layers, single-layer steel casing is difficult to effectively prevent mud leakage and groundwater influx. Mud leakage will not only cause the instability of the hole wall, increase the risk of hole collapse, and affect the construction progress, but may also cause concrete pouring quality problems, thereby reducing the bearing capacity of the pile foundation. At the same time, a large amount of groundwater influx will dilute the mud, change the mud properties, and increase the difficulty and cost of construction. Therefore, double-layer steel casings came into being. There is an urgent need for efficient and reliable double-layer steel casing leakage prevention mechanisms in the market. Developing a double-layer steel casing leakage prevention mechanism that can effectively prevent mud leakage, adapt to a variety of complex geological conditions, and have good environmental protection performance and construction convenience is of great practical significance for improving the quality of pile foundation construction, reducing construction costs, protecting the environment, and promoting technological progress in the construction industry. The mechanism must not only be able to perform excellent leak-proofing effects in conventional construction environments, but also demonstrate outstanding performance in extremely complex construction scenarios such as cross-sea bridge construction and urban subways crossing water-rich strata, to ensure the smooth progress and long-term stability of the project.

[0003] The Chinese patent document with the authorization announcement number CN113089653B discloses a multi-casing construction method for cast-in-place pile foundation, including: prefabricating a number of steel casings with different diameters and lengths, and selecting a steel casing with a casing diameter larger than the pile diameter for in-situ construction; excavating the pile foundation layer by layer during installation and construction, nesting and lowering the casing from the outside to the inside, and pouring in sections during removal and pulling out the casing layer by layer from the inside to the outside. The patent document adopts multiple casings with different inner diameters to nest layer by layer for construction, and the height of the steel casing increases layer by layer from the outside to the inside. Only the lower end of each layer of steel casing is exposed in the soil layer. When installing and removing, only the friction resistance brought by this part of the soil needs to be dealt with externally, and the steel casing can be easily installed and removed; it can not only solve the problem that the rotary drilling machine is not high enough for construction due to the excessive depth of the pile foundation and the excessive height of the casing, meet the steel casing construction needs of high-depth pile foundations, but also speed up the construction speed, recycle the steel casing, and effectively control the construction cost.

[0004] During pouring, since there is a gap between the inner and outer casings, the bottom pouring material is easy to flow along the soil during pouring. After the pouring material is lost, cavities appear inside the concrete. Therefore, it is easy to affect the stability of the device after molding and easily cause waste of resources. Summary of the invention

[0005] The invention provides a double-layer steel casing leakage prevention device for a pile foundation, aiming to solve the problem in the related art that the bottom poured material between the double-layer casings is easily lost along the soil.

[0006] A double-layer steel casing leak prevention device for a pile foundation, comprising: a rubber ring sleeved on an inner casing, and a support structure for supporting the rubber ring, wherein the rubber ring is in the shape of a conical ring, and the inner edge of the rubber ring is attached to and fixed to the inner casing, and the support structure comprises:

[0007] A plurality of rotating rods are arranged below the rubber ring and are hinged to the inner casing, and are arranged in a circular array around the axis of the inner casing;

[0008] The support ring is composed of at least two arc-shaped rods, the arc-shaped rods are made of elastic metal, the arc-shaped rods pass through the outer end of the rotating rod, the ends of the arc-shaped rods are slidably connected with the ends of the adjacent arc-shaped rods, and an elastic member for keeping the two arc-shaped rods relatively away is installed between the two arc-shaped rods;

[0009] A plurality of locking members, used for limiting the relative sliding of the two arc-shaped rods, so that the elastic member is in a compressed state;

[0010] A crimping ring and a driving member for controlling the descent of the crimping ring;

[0011] In the initial state, the curling ring is located above the rubber ring. At this time, the inner diameter of the curling ring is larger than the outer diameter of the support ring. When the two layers of steel casings are aligned, the driving member drives the curling ring to descend, so that the outer edge of the rubber ring is folded downward to form a folded edge. The curling ring continues to descend to open the locking member, so that all the arc rods slide away from each other, and the support ring becomes larger and presses against the folded edge, so that the other side of the folded edge is pressed on the inner wall of the outer casing.

[0012] The effect is that when the inner casing is put into the outer casing, the rubber ring is tilted along the direction of the inner casing, so as to facilitate entering the outer casing. After being put in, the driving member drives the curling ring to descend, so that the curling ring passes over the supporting ring, and the outer edge of the rubber ring is folded downward to form a folded edge. At the same time, the rotating rod rotates outward to make the rubber ring close to the inner wall of the outer casing, so as to prevent concrete from leaking to the bottom, and the concrete applies downward pressure to the rubber ring, so that the clamping force of the rotating rod and the outer casing on the rubber ring becomes larger, so as to have a better sealing effect.

[0013] Preferably, a steel wire is provided at the inner edge of the rubber ring, and the inner edge of the conical ring is fixed to the inner casing by the steel wire, so that the rubber ring can be conveniently fixed by the steel wire.

[0014] Preferably, a plurality of hooks adapted to the curling ring are fixedly provided at the outer edge of the rubber ring, the curling ring abuts against the outer edge of the upper surface of the rubber ring, the curling ring descends, and the hooks are hooked on the curling ring, so that the outer edge of the rubber ring is folded downward to form a folded edge.

[0015] Preferably, a plurality of mounting seats are fixedly mounted on the inner casing, the rotating rod is hinged on the mounting seats, the mounting seats are fixedly mounted on the inner casing by welding, and the position of the rotating rod is positioned by the mounting seats.

[0016] Preferably, a positioning groove opening inward is provided on the upper portion of the mounting seat, and the steel wire passes through the positioning groove, thereby limiting the position of the steel wire and preventing the steel wire and the rubber ring from sliding downward. The relative positions of the rubber ring and the rotating rod are positioned by the mounting seat to prevent the rotating rod from excessively rotating and failing to support it.

[0017] Preferably, a sliding sleeve is sleeved between the ends of the two arc-shaped rods.

[0018] Preferably, the elastic member is arranged in the sliding sleeve, and the elastic member is a compression spring. When the inner casing is placed in the outer casing, the rotating rod does not contact the inner wall of the outer casing and follows the direction of movement, so it is convenient to place it and avoid collision. After placement, the inner diameter of the curling ring is larger than the outer diameter of the support ring, and there is a small gap between the curling ring and the inner wall of the outer casing.

[0019] Preferably, the driving member includes a counterweight block arranged below the rubber ring, a rope is connected between the counterweight block and the curling ring, the top of the rope extends to the upper end of the inner casing, and in an initial state, the top of the rope is connected to the lifting device, and when the lifting device releases the rope, the two ropes are released together to avoid large deflection of the curling ring.

[0020] Preferably, a pressure rod capable of resisting against the curling ring is fixedly mounted on the rotating rod, so that when the curling ring descends, the rotating rod can be flipped outward. In order to enable the rotating rod to overcome the friction between the rotating rod and the arc rod and rotate, the curling ring resists against the pressure rod when it descends, thereby assisting the rotating rod to rotate outward. Finally, the curling ring is stuck between the rotating rod and the pressure rod, thereby providing a certain falling force to the rotating rod, thereby increasing the pressure of the rotating rod on the rubber ring.

[0021] Preferably, the locking member is composed of two fork rods and a connecting rod connecting the fork rods, and the arc-shaped rod is provided with limit grooves in the upper and lower directions near the two ends, and the two fork rods respectively pass through the limit grooves on the two arc-shaped rods, thereby limiting the relative sliding of the two arc-shaped rods, and a through hole is opened on the connecting rod, and a rope passes through the through hole, and a knot that can abut against the top of the through hole is provided on the rope. When the support ring is installed, the two arc-shaped rods are relatively squeezed to make the compression spring in a compressed state, so that the rotating rod rotates inward, and then the two fork rods of the locking member are respectively inserted into the two arc-shaped rods. In the limit groove, there is a large damping force between the fork rod and the limit groove, thereby preventing the two from falling off by themselves and limiting the two arc rods from moving away from each other. At this time, the outer diameter of the support ring is smaller than the inner diameter of the curling ring, thereby ensuring that the curling ring can pass over the outside of the support ring. When the curling ring descends, the upper knot resists the connecting rod, causing the fork rod to separate from the arc rod, and the compression spring releases elastic potential energy, thereby expanding the support ring. At the same time, the curling ring resists the pressure rod, thereby assisting the rotating rod to rotate outward, so that the rotating rod and the arc rod squeeze the rubber ring, so that the rubber ring is attached to the inner wall of the outer casing.

[0022] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0023] 1. After the outer casing is installed in the foundation pit, use the lifting device to hang the inner casing and the top of the rope, and then put the inner casing into the outer casing. At this time, the rotating rod does not contact the inner wall of the outer casing and follows the direction of movement, so it is convenient to put it in and avoid collision. After putting it in, the inner diameter of the curling ring is larger than the outer diameter of the support ring, and there is a small gap between the curling ring and the inner wall of the outer casing. The lifting device releases the rope, and the curling ring is against the outer edge of the upper surface of the rubber ring. The counterweight pulls the curling ring to continue to descend, and the hook is hooked on the curling ring. The outer edge of the rubber ring is folded downward to form a folded edge, and then the upper rope knot is abutted against the connecting rod, so that the fork rod is separated from the arc rod, and the compression spring releases elastic potential energy, thereby expanding the support ring. At the same time, the curling ring is abutted against the compression rod, thereby assisting the rotating rod to rotate outward, so that the rotating rod and the arc rod squeeze the rubber ring, so that the rubber ring is attached to the inner wall of the outer casing. At this time, the inner end of the rotating rod is higher than the outer end, thereby avoiding excessive flipping. Finally, pouring concrete into the pouring cavity can prevent concrete from leaking from the bottom and avoid affecting the construction effect.

[0024] 2. When the curling ring descends, the hook on the rubber ring hooks the curling ring, and finally the curling ring passes over the support ring, and the curling ring abuts against the pressure rod, thereby exerting downward pressure on the pressure rod, and then the rotating ring is subjected to downward pressure, causing the rotating rod to flip outward, and finally the curling ring is stuck between the rotating rod and the pressure rod, thereby providing a certain downward force on the rotating rod, thereby increasing the pressure of the rotating rod on the rubber ring and providing sealing between the rubber ring and the outer casing;

[0025] 3. When pouring concrete again, under the action of the gravity of concrete, the rotating rod is subjected to downward pressure, and the rotating rod and the support ring jointly increase the pressure on the rubber ring, thereby further increasing the extrusion pressure of the rubber ring on the inner wall of the outer casing, further enhancing the sealing between the rubber ring and the outer casing, thereby further preventing concrete from leaking downward into the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention in the initial state.

[0027] Figure 2 It is a structural schematic diagram of the present invention in a completed state.

[0028] Figure 3 It is a vertical cross-sectional view of the present invention in a completed state.

[0029] Figure 3a for Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0030] Figure 4 It is a schematic structural diagram of the rotating rod in the present invention.

[0031] Figure 5 It is a schematic diagram of the structure of the rubber ring in the present invention.

[0032] Figure 6 It is a schematic diagram of the structure of the support ring in the present invention.

[0033] Figure 7 for Figure 6 Schematic diagram of the enlarged structure at point A in the middle.

[0034] Figure 8 It is a cross-sectional view of the sliding sleeve in the present invention.

[0035] Reference numerals:

[0036] 1. Rubber ring; 11. Steel wire; 12. Hook; 2. Rotating rod; 21. Mounting seat; 211. Positioning groove; 22. Press rod; 3. Support ring; 31. Arc rod; 32. Compression spring; 33. Sliding sleeve; 4. Curling ring; 5. Driving part; 51. Counterweight; 52. Rope; 6. Locking part; 61. Fork rod; 62. Connecting rod. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0038] like Figure 1-Figure 8As shown, a double-layer steel casing leakage prevention device for pile foundation includes: a rubber ring 1, a plurality of rotating rods 2, a support ring 3, a crimping ring 4 and a driving member 5. A positioning rod for keeping the inner casing coaxial with the outer casing is fixedly installed on the outer circumferential surface of the inner casing, so that an annular perfusion cavity is formed between the inner and outer casings. The rubber ring 1 is sleeved on the inner casing, and a plurality of rotating rods 2 are arranged in a circumferential array below the rubber ring 1 and are hinged to the inner casing. The support ring 3 strings together the outer ends of all the positioning rods, and the support ring 3 can be deformed so that the positioning rods rotate so that the outer ends of the positioning rods are close to the inner casing. When the inner casing is placed in the outer casing, the rubber ring 1 is tilted along the direction of the inner casing, so as to facilitate entering the outer casing. After being placed in, the driving member 5 drives the curling ring 4 to descend, so that the curling ring 4 passes over the supporting ring 3, and the outer edge of the rubber ring 1 is folded downward to form a folded edge. At the same time, the rotating rod 2 rotates outward to make the rubber ring 1 close to the inner wall of the outer casing, thereby preventing concrete from leaking to the bottom, and applying downward pressure to the rubber ring 1 through the concrete, so that the clamping force of the rotating rod 2 and the outer casing on the rubber ring 1 becomes larger, thereby having a better sealing effect.

[0039] The shape of the rubber ring 1 is a conical ring (such as Figure 5 As shown in the figure, the inner edge of the rubber ring 1 is in contact with the inner casing, and a steel wire 11 is provided at the inner edge of the rubber ring 1, and the inner edge of the conical ring is fixed to the inner casing by the steel wire 11. A plurality of hooks 12 adapted to the curling ring 4 are fixedly provided at the outer edge of the rubber ring 1. When the curling ring 4 descends and presses the rubber ring 1 to fold, the hooks 12 are hung on the curling ring 4, thereby preventing the curling ring 4 from falling off from the rubber ring 1. When entering the outer casing, the outer edge of the rubber ring 1 contacts the inner wall of the outer casing.

[0040] A plurality of mounting seats 21 are fixedly mounted on the inner casing, the rotating rod 2 is hinged on the mounting seat 21, a through hole is provided at the outer end of the rotating rod 2, the mounting seat 21 is welded to the inner casing, and a positioning groove 211 opening inward is provided on the upper portion of the mounting seat 21, the steel wire 11 passes through the positioning groove 211, thereby limiting the position of the steel wire 11 and preventing the steel wire 11 and the rubber ring 1 from sliding downward.

[0041] The support ring 3 is composed of two arc-shaped rods 31, two compression springs 32 and two sliding sleeves 33. The arc-shaped rods 31 are made of elastic metal (such as spring steel). The arc-shaped rods 31 pass through the through hole at the outer end of the rotating rod 2. The ends of the two arc-shaped rods 31 close to each other are respectively inserted into the sliding sleeve 33 from the two ends of the sliding sleeve 33, and the compression springs 32 are installed in the sliding sleeve 33 to make the two arc-shaped rods 31 relatively far away from each other. When the two arc-shaped rods 31 are relatively separated, the size of the support ring 3 becomes larger, so that the rotating rod 2 rotates outward, and the outer end of the rotating rod 2 is close to the inner wall of the outer casing.

[0042] In order to make the compression spring 32 in a compressed state, a locking member 6 is installed between the two arc-shaped rods 31. The locking member 6 is composed of two fork rods 61 and a connecting rod 62 connecting the fork rods 61. The arc-shaped rod 31 is provided with a limit groove in the upper and lower directions near the two ends. The two fork rods 61 pass through the limit grooves on the two arc-shaped rods 31 respectively, thereby limiting the relative sliding of the two arc-shaped rods 31. A through hole is provided on the connecting rod 62. When the support ring 3 is installed, the two arc-shaped rods 31 are relatively squeezed to make the compression spring 32 in a compressed state, so that the rotating rod 2 rotates inward, and then the two fork rods 61 of the locking member 6 are respectively inserted into the limit grooves of the two arc-shaped rods 31 (such as Figure 6 As shown in FIG. 1 ), there is a large damping force between the fork rod 61 and the limiting groove, thereby preventing the two from falling off by themselves and limiting the two arc rods 31 from moving away from each other. At this time, the outer diameter of the support ring 3 is smaller than the inner diameter of the curling ring 4, thereby ensuring that the curling ring 4 can pass over the outside of the support ring 3 (as shown in FIG. Figure 4 as shown).

[0043] There are two driving members 5, and the driving members 5 include: a counterweight block 51 arranged below the rubber ring 1, and a rope 52 connected between the counterweight block 51 and the curling ring 4 (the counterweight block 51 can be replaced by a brick, and the bottom end of the rope 52 is tied to the brick, so the cost is low and it is easy to find at the construction site), the rope 52 passes through the through hole of the connecting rod 62, and two knots are arranged on the rope 52, the two knots can be abutted against the top and bottom ends of the through hole, so as to limit the position of the connecting rod 62, and the top of the rope 52 extends to the upper end of the inner casing. In the initial state, the top of the rope 52 is connected to the lifting device. When the lifting device releases the rope 52, the two ropes 52 are released together to avoid a large deflection of the curling ring 4.

[0044] In order to enable the rotating rod 2 to overcome the friction between the rotating rod 2 and the arc rod 31 and rotate, a pressure rod 22 capable of resisting the curling ring 4 is fixedly installed on the rotating rod 2, so that when the curling ring 4 descends, the rotating rod 2 can be turned outward, and finally the curling ring 4 is stuck between the rotating rod 2 and the pressure rod 22, thereby providing a certain falling force to the rotating rod 2, thereby increasing the pressure of the rotating rod 2 on the rubber ring 1 (such as Figure 3a as shown).

[0045] Working principle: After the outer casing is installed in the foundation pit, use the lifting device to hang the inner casing and the top of the rope 52, and then put the inner casing into the outer casing. At this time, the rotating rod 2 does not contact the inner wall of the outer casing and follows the direction of movement, so it is convenient to put it in and avoid collision. After putting it in, the inner diameter of the curling ring 4 is larger than the outer diameter of the support ring 3, and there is a small gap between the curling ring 4 and the inner wall of the outer casing. The lifting device releases the rope 52, and the curling ring 4 is against the outer edge of the upper surface of the rubber ring 1. The counterweight 51 pulls the curling ring 4 to continue to descend, and the hook 12 is hooked on the curling ring 4, so that the outer edge of the rubber ring 1 is folded downward to form a folded edge (such as Figure 3a As shown), the upper knot then abuts against the connecting rod 62, so that the fork rod 61 is separated from the arc rod 31, and the compression spring 32 releases its elastic potential energy, thereby expanding the support ring 3. At the same time, the curling ring 4 abuts against the compression rod 22, thereby assisting the rotating rod 2 to rotate outward, so that the rotating rod 2 and the arc rod 31 squeeze the rubber ring 1, so that the rubber ring 1 is attached to the inner wall of the outer casing. At this time, the inner end of the rotating rod 2 is higher than the outer end, thereby avoiding excessive turning over. Finally, concrete is poured into the pouring cavity. Under the action of the gravity of the concrete, the squeezing force of the rubber ring 1 on the inner wall of the outer casing is further increased, thereby preventing the concrete from leaking downward into the soil.

[0046] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A double-layer steel casing leak-proof device for pile foundation, comprising: A rubber ring sleeved on the inner casing and a supporting structure for supporting the rubber ring, characterized in that the rubber ring is in the shape of a conical ring, a steel wire is arranged at the inner edge of the rubber ring, the inner edge of the conical ring is fixed to the inner casing by the steel wire, a plurality of mounting seats are fixedly mounted on the inner casing, a positioning groove opening inward is arranged on the upper part of the mounting seat, and the steel wire passes through the positioning groove; The support structure comprises: A plurality of rotating rods, which are located below the rubber ring and hinged on the mounting seat, are arranged in a circular array around the axis of the inner casing; The support ring is composed of at least two arc-shaped rods, the arc-shaped rods are made of elastic metal, the arc-shaped rods pass through the outer end of the rotating rod, the ends of the arc-shaped rods are slidably connected with the ends of the adjacent arc-shaped rods, a sliding sleeve is sleeved between the ends of the two arc-shaped rods, and an elastic member for keeping the two arc-shaped rods relatively away is installed between the two arc-shaped rods, the elastic member is arranged in the sliding sleeve, and the elastic member is a compression spring; A plurality of locking members, wherein the locking members are composed of two fork rods and a connecting rod connecting the fork rods, a position near both ends of the arc rod is provided with a limit groove in the up-and-down direction, the two fork rods respectively pass through the limit grooves on the two arc rods, thereby limiting the relative sliding of the two arc rods and making the elastic member in a compressed state, and a through hole is provided on the connecting rod; a curling ring and a driving member for controlling the descent of the curling ring, the driving member comprising a counterweight block arranged under the rubber ring, a rope is connected between the counterweight block and the curling ring, the rope passes through the through hole, a rope knot is provided on the rope that can abut against the top of the through hole, and the top of the rope extends to the upper end of the inner casing; A pressure rod that can resist the curling ring is fixedly installed on the rotating rod, so that when the curling ring descends, the rotating rod can be flipped outward; in the initial state, the curling ring is located above the rubber ring. At this time, the inner diameter of the curling ring is larger than the outer diameter of the support ring. When the two layers of steel casings are aligned, the driving member drives the curling ring to descend, so that the outer edge of the rubber ring is folded downward to form a flap. The curling ring continues to descend to open the locking member, so that all the arc rods slide away from each other, and the support ring becomes larger and presses against the flap, so that the other side of the flap is pressed on the inner wall of the outer casing.

2. The double-layer steel casing anti-leakage device for pile foundation according to claim 1 is characterized in that: A plurality of hooks matched with the curling ring are fixedly arranged on the outer edge of the rubber ring.

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