Waterproof plug for underwater concrete pouring

Abstract

The utility model relates to the technical field of underwater concrete pouring construction of cast-in-place piles, in particular to an underwater concrete pouring waterproof plug which comprises a waterproof plug body and a sealing ring. The sealing ring is arranged on the lower side of the waterproof plug body, and the outer diameter of the sealing ring is at least partially larger than that of the waterproof plug body; the peripheral size of the cross section of the waterproof plug body is gradually enlarged from top to bottom, and the waterproof plug can be repeatedly used, the underwater concrete pouring quality can be improved, and the pouring cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of underwater concrete pouring construction technology for cast-in-place piles, specifically to a water-tight plug for underwater concrete pouring. Background Technology

[0002] Underwater concrete pouring, also known as tremie concrete pouring, is a method of pouring concrete through a vertical tremie pipe, relying on the concrete's own weight. It is suitable for underwater or underground engineering projects such as cofferdams, caisson foundations, well foundations, diaphragm walls, and pile foundations. The concrete flows slowly from the bottom of the pipe, expanding outwards and is less disturbed by surrounding water flow, thus ensuring quality. The initial pour is the most crucial step in underwater concrete pouring, directly affecting the quality of the entire pile. After the concrete arrives on site, the initial pour volume is calculated beforehand, and a sufficient amount of concrete is placed in a storage hopper (usually with a water-tight ball slightly smaller than the tremie pipe placed inside the sleeve to ensure successful sealing of the initial pour). At the start of pouring, the hopper valve is quickly and fully opened, allowing the concrete to fall with great force. This ensures sufficient pressure to completely expel and neutralize the water pressure inside the sleeve, allowing the concrete to successfully seal the bottom, meeting the requirement of a burying pipe of at least one meter. After the initial pour is successful, subsequent pours can be adjusted appropriately based on equipment and conditions.

[0003] According to the current industry standard "Technical Specification for Building Pile Foundations" JGJ79-2008, during the initial underwater concrete pouring, a water-stop ball or a water-stop plug made of fine aggregate concrete is used to seal the bottom of the storage hopper. After a sufficient amount of concrete is poured into the storage hopper, the pull line of the water-stop plug is cut, and the initial concrete and the water-stop plug enter the bottom of the hole under gravity through the concrete guide pipe. However, based on practical construction experience, precast concrete water-stop plugs have the following drawbacks: Precast concrete water-stop plugs require on-site fabrication and curing according to the dimensions of the guide pipe, which is time-consuming and labor-intensive; precast concrete water-stop plugs require the guide pipe to be free from deformation and have good verticality, otherwise blockage may occur; and the sinking of the precast concrete water-stop plug to the bottom after the final pouring will affect the quality of the concrete pile. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a water-tight plug for underwater concrete pouring. It can not only realize the reuse of the water-tight plug, but also improve the quality of underwater concrete pouring and reduce the pouring cost.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an underwater concrete pouring water-tight plug, comprising a water-tight plug body and a sealing ring; the sealing ring is disposed on the lower side of the water-tight plug body, wherein the outer diameter of the sealing ring is at least partially larger than the outer diameter of the water-tight plug body; the outer perimeter of the cross-section of the water-tight plug body gradually increases from top to bottom.

[0006] Preferably, the water-stop plug body has a semi-elliptical structure.

[0007] Preferably, the upper part of the water-stop plug body has a connecting hole opened laterally.

[0008] Preferably, the top of the water-stop plug body is provided with a traction block.

[0009] Preferably, the longitudinal section of the sealing ring is an inverted L-shaped structure.

[0010] Preferably, the water-stop plug further includes an annular plate and a plurality of bolts; the annular plate is fixedly disposed on the lower side of the water-stop plug body by bolts; the plurality of bolts are all located inside the sealing ring and the sealing ring is pressed and slidably connected with the bolts; the sealing ring is disposed on the annular plate; the outer diameter of the annular plate is not greater than the outer diameter of the lower end of the water-stop plug body.

[0011] Preferably, the water-stop plug further includes a support column, which is fixedly disposed at the lower end of the water-stop plug body; the upper end of the ring plate abuts against the lower end of the support column, and bolts are distributed around the axis of the support column.

[0012] Preferably, the support column is a hollow structure.

[0013] Preferably, the traction block is a lifting ring or a long rod.

[0014] Preferably, the sealing ring is made of rubber.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: by designing the water-stop plug with a streamlined structure, the resistance of pulling the water-stop plug out of the bottom of the storage hopper can be reduced, which facilitates construction; the water-stop plug is also equipped with an L-shaped sealing ring to ensure good waterproof performance of the water-stop plug and ensure the quality of the first concrete pouring; compared with the prior art, this water-stop plug can not only be reused, but also avoid the situation of precast concrete water-stop plugs clogging the conduit, thereby improving the quality of underwater concrete pouring and reducing pouring costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the water-stop plug of this utility model;

[0017] Figure 2 This is a schematic diagram of the left side structure of the water-stop plug of this utility model;

[0018] Figure 3 This is a schematic diagram of the water-stop plug of this utility model in use.

[0019] In the diagram: 1. Water-stop plug body, 2. Sealing ring, 3. Ring plate, 4. Bolt, 5. Storage hopper, 6. Conduit, 7. Water-stop ball, 8. Traction line, 11. Connecting hole, 12. Support column. Detailed Implementation

[0020] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice this utility model. Although this utility model has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative and not intended to limit the scope of this utility model.

[0021] See Figure 1-3 In one embodiment of this utility model, an underwater concrete pouring water-tight plug includes: a water-tight plug body 1, a sealing ring 2, an annular plate 3, and four bolts 4. The annular plate 3 is fixed to the lower side of the water-tight plug body 1 by the bolts 4. The annular plate 3 is used to support the water-tight plug and the water-tight ball, so that the water-tight plug and the water-tight ball maintain a stable posture before the first underwater concrete pouring, and fully separate the first concrete pouring from the water under the water-tight plug and the water-tight ball, ensuring the quality of the first concrete pouring. The sealing ring 2 is located between the annular plate 3 and the water-tight plug body 1. The outer diameter of the sealing ring 2 is designed to match the inner diameter of the conduit, so that the water-tight plug has a high water-sealing function, which can ensure that the concrete stored in the hopper will not flow into the conduit and come into contact with the mud water, further ensuring the quality of the first concrete pouring.

[0022] Specifically, the water-stop plug body 1 has a semi-elliptical structure, and every cross-section perpendicular to its axis is circular. It can be understood that the outer diameter of the water-stop plug body 1 increases sequentially from top to bottom, and the whole has a streamlined and smooth surface structure. At the same time, the outer diameter of the water-stop plug body 1 is not greater than the inner diameter of the conduit 6. In actual use, the water-stop plug body 1 and the conduit 6 are loosely fitted or in line contact. This setting can isolate the concrete and the water in the conduit when the water-stop plug is placed in the conduit 6. On the other hand, when the water-stop plug is pulled out, the streamlined structure and smooth surface of the water-stop plug body 1 can minimize the resistance of the concrete to the water-stop plug, making it convenient for construction personnel to operate.

[0023] In one embodiment, to facilitate the removal of the water-stop plug by construction personnel, a through connecting hole 11 is provided on the upper part of the water-stop plug body 1. The direction of the connecting hole 11 is perpendicular to the axis of the water-stop plug body 1. During operation, the traction wire 8 can pass through the connecting hole 11 and is connected to the upper part of the water-stop plug. This can prevent the traction wire 8 from breaking due to friction with the guide tube during the removal process, thus ensuring the normal progress of construction.

[0024] In other embodiments, the connection between the traction line 8 and the water-stop plug is not limited to the above-mentioned method of opening a connection hole 11 in the water-stop plug body 1, but can also be a traction block set on the top of the water-stop plug body 1. The traction block can be a lifting ring or a long rod.

[0025] The water-stop plug also includes a support column 12, which is fixedly installed at the lower end of the water-stop plug body 1. When the ring plate 3 is fixedly installed on the lower side of the water-stop plug body 1 by bolts 4, the upper end of the ring plate 3 abuts against the lower end of the support column 12, and the four bolts 4 are distributed around the axis of the support column 12. The bolts 4 are threadedly connected to the lower end of the water-stop plug body 1. The purpose of setting the support column 12 is to form a gap between the ring plate 3 and the water-stop plug body 1 for placing the sealing ring 2.

[0026] Furthermore, the outer diameter of the ring plate 3 is not greater than the outer diameter of the lower end of the water-stopping plug body 1.

[0027] In one embodiment, the support column 12 has a hollow structure to reduce the weight of the entire water-stop plug and make it easier for construction workers to remove the water-stop plug.

[0028] Four bolts 4 form a support structure, and all bolts 4 are located inside the sealing ring 2; the sealing ring 2 is pressed and slidably connected with the bolts 4, and the sealing ring 2 is stretched open and kept stable.

[0029] The longitudinal section of the sealing ring 2 is an L-shaped structure. The outer periphery of the lower end of the sealing ring 2 is tightly connected to the inner wall of the conduit to achieve a seal. This seal can also be understood as a line seal. It can be understood that the outer diameter of the sealing ring 2 is larger than the outer diameter of the lower end of the water-stop plug body 1.

[0030] The sealing ring 2 is inverted and placed on the upper end of the ring plate 3. The inner wall of the sealing ring 2 fits against the upper end of the ring plate 3, that is, the sealing ring 2 wraps around the outer edge of the ring plate 3. This can effectively open the sealing ring and play a sealing role. In addition, the L-shaped structure of the inverted sealing ring 2 has an upward tendency. When the construction personnel lift the water-stop plug, the pressure between the sealing ring 2 and the conduit is minimal, which is conducive to lifting the water-stop plug.

[0031] In one embodiment, the sealing ring 2 can be made of rubber.

[0032] The working principle of this water-stop plug is as follows: During the underwater concrete pouring process, the water-stop ball and water-stop plug are placed into the hopper in sequence to ensure that the water-stop plug is tightly sealed at the bottom of the hopper before pouring concrete into the hopper. When the concrete storage in the hopper meets the requirements, the water-stop plug can be pulled out manually. At this time, the concrete presses against the water-stop ball and is poured into the bottom of the hole. The pressure of the first concrete pouring pushes the water-stop ball to squeeze out the water in the conduit. At the same time, the concrete falls and fills the bottom of the conduit, and quickly seals the concrete pipe opening to form a certain burial depth.

[0033] This technical solution, through the streamlined design of the water-stop plug, reduces the resistance of pulling the water-stop plug out of the bottom of the storage hopper, facilitating construction; the water-stop plug is also equipped with an L-shaped sealing ring to ensure good waterproof performance and ensure the quality of the first concrete pour; compared with the existing technology, this water-stop plug can not only be reused, but also avoids the blockage of the conduit by the precast concrete water-stop plug, improving the quality of underwater concrete pouring and reducing pouring costs.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A water-tight plug for underwater concrete casting, characterized in that: It includes a water-stop plug body (1) and a sealing ring (2); the sealing ring (2) is located on the lower side of the water-stop plug body (1), wherein the outer diameter of the sealing ring (2) is larger than the outer diameter of the water-stop plug body (1); the outer perimeter of the cross-section of the water-stop plug body (1) gradually increases from top to bottom.

2. The underwater concrete casting water-tight plug according to claim 1, characterized in that: The water-stopping plug body (1) has a semi-elliptical structure.

3. The underwater concrete casting water-tight plug according to claim 1, characterized in that: The water-stop plug body (1) has a connecting hole (11) on its upper part.

4. The underwater concrete casting water-tight plug according to claim 1, characterized in that: The top of the water-stop plug body (1) is provided with a traction block.

5. The underwater concrete casting water-tight plug according to claim 1, characterized in that: The longitudinal section of the sealing ring (2) is an inverted L-shaped structure.

6. The underwater concrete casting water-tight plug according to claim 1, characterized in that: The water-stopping plug also includes a ring plate (3) and several bolts (4); the ring plate (3) is fixed to the lower side of the water-stopping plug body (1) by the bolts (4); the several bolts (4) are all located inside the sealing ring (2) and the sealing ring (2) is pressed and slidably connected with the bolts (4); the sealing ring (2) covers the ring plate (3); the outer diameter of the ring plate (3) is not greater than the outer diameter of the lower end of the water-stopping plug body (1).

7. The underwater concrete casting water-tight plug according to claim 6, characterized in that: The water-stop plug also includes a support column (12), which is fixed at the lower end of the water-stop plug body (1); the upper end of the ring plate (3) abuts against the lower end of the support column (12), and the bolts (4) are distributed around the axis of the support column (12).

8. The underwater concrete casting water-tight plug according to claim 7, characterized in that: The support column (12) is a hollow structure.

9. A water-tight plug for underwater concrete casting according to claim 4, characterized in that: The traction block is a lifting ring or a long rod.

10. A water-tight plug for underwater concrete casting according to claim 1, characterized in that: The sealing ring (2) is made of rubber.

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