A device for lowering a pouring pipe
By using a fixed base, a centering cylinder, and a grab bar structure, combined with wire ropes and lifting rings, the problem of sand and gravel falling from the inner wall of the foundation pit during the lowering of the pouring duct was solved, thus achieving stable lowering of the duct and continuous pouring of concrete.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOHYDRO BUREAU 5
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-03
AI Technical Summary
When existing pouring pipes are lowered into large foundation pits, they cause sand and gravel to fall off the inner wall of the pit, affecting the concrete pouring process.
The system employs a fixed base, a centering cylinder, and a grab bar structure. The lowering of the pouring pipe is controlled by steel wire ropes and lifting rings. The threaded rod and lifting rings are used to achieve a slow descent. The grab bar is adaptable to pipes of different sizes to ensure stable lowering of the pipe.
This effectively prevented sand and gravel from falling off the inner wall of the foundation pit, ensuring the stability and continuity of concrete pouring and improving the stability and adaptability of the tremie pipe lowering.
Smart Images
Figure CN224451649U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of concrete pouring technology, specifically to a device for lowering a pouring guide pipe. Background Technology
[0002] A cutoff wall is a continuous wall constructed in loose permeable layers or earth-rock dams to prevent seepage. During the construction of a cutoff wall, a foundation pit is first dug on the ground, and then a pouring pipe is lowered into the pit to pour the concrete into the cutoff wall.
[0003] The existing pouring pipes are lowered along the inner wall of the foundation pit from the edge of the pit opening. Since the foundation pit for the cutoff wall is a large pit, the pouring pipes used are large in diameter and weight, putting significant pressure on the pit opening and inner wall. As the pouring pipes are continuously lowered, sand and gravel from the inner wall of the pit continuously fall off and accumulate at the bottom, affecting the concrete pouring process. Utility Model Content
[0004] The purpose of this utility model is to provide a device for lowering a pouring pipe to solve the technical problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0006] A device for lowering a pouring pipe includes fixed seats installed on the left and right sides of the pit opening, and a centering cylinder between the two fixed seats. The centering cylinder is located above the middle of the pit. The left side of the centering cylinder is connected to the left fixed seat via a connecting rod, and the right side of the centering cylinder is connected to the right fixed seat via another connecting rod. The pouring pipe passes downward through the inside of the centering cylinder. Two or more grab bars are provided at the bottom of the centering cylinder. The lower end of the grab bars is engaged with the bottom of the pouring pipe, and the upper end of the grab bars is connected to the centering cylinder via a steel wire rope. The pouring pipe is lowered by adjusting the length of the steel wire rope.
[0007] Furthermore, the top and bottom of the centering cylinder are respectively provided with an outwardly extending first ring and a second ring, and a threaded rod is provided between the first ring and the second ring, the number of threaded rods being the same as the number of gripping rods; a lifting ring is sleeved on the threaded rod, the lifting ring being threadedly connected to the threaded rod, and a limit ring is provided at the top and bottom of the lifting ring, and a through hole is provided on the bottom limit ring, the upper end of the wire rope passing through the through hole and being wound around the surface of the lifting ring multiple times before being fixedly connected to the lifting ring; under no external force, the lifting ring is located at the bottom of the threaded rod.
[0008] Furthermore, the gripper includes a support claw and a connecting column, the connecting column being hinged to the support claw and a coil spring being provided at the hinge; the support claw is engaged with the bottom of the pouring conduit, and the upper end of the connecting column is connected to a steel wire rope.
[0009] Furthermore, a cylindrical groove is provided at the bottom of the centering cylinder, and the upper end of the connecting column is located inside the cylindrical groove.
[0010] Furthermore, the number of gripping rods is three, and the three gripping rods are equally spaced along the circumference of the centering cylinder.
[0011] Compared with the prior art, this utility model has the following advantages and beneficial effects:
[0012] This invention features fixed bases installed on both sides of the pit opening. A centering cylinder is connected to these fixed bases via connecting rods on both sides, positioning it above the center of the pit. The discharge end of the pouring guide pipe passes through the centering cylinder, thus limiting its position and preventing it from falling through the pit's inner wall during descent. This would cause sand and gravel to continuously fall from the pit's inner wall and accumulate at the bottom, hindering concrete pouring. Attached Figure Description
[0013] Figure 1 This is a diagram of the initial state of this utility model.
[0014] Figure 2 This is a diagram showing the pouring guide pipe of this utility model in its lowering state.
[0015] Figure 3 for Figure 2 Enlarged view of point A.
[0016] Figure 4 This is a cross-sectional view of the casting guide pipe.
[0017] Figure 5 for Figure 4 Enlarged view of point B.
[0018] Figure 6 This is a bottom view of the pouring pipe.
[0019] The labels in the diagram are as follows: 1-Foundation pit, 2-Casting guide pipe, 3-Fixed seat, 301-Connecting rod, 4-Centering cylinder, 401-Grab rod, 4011-Connecting column, 4012-Support claw, 402-Wire rope, 403-First ring, 404-Second ring, 405-Threaded rod, 406-Lifting ring, 407-Limiting ring. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, so as to provide a better understanding of the concept of the present utility model, the technical problem solved, the technical features constituting the technical solution and the technical effects brought about.
[0021] like Figure 1 and Figure 2 As shown, a lowering device for a pouring pipe includes fixed seats 3 installed on the left and right sides of the opening of the foundation pit 1, and a centering cylinder 4 is arranged between the two fixed seats 3. The centering cylinder 4 is located above the middle of the foundation pit 1. The left side of the centering cylinder 4 is connected to the left fixed seat 3 through a connecting rod 301, and the right side of the centering cylinder 4 is connected to the right fixed seat 3 through another connecting rod 301. The pouring pipe 2 passes downward through the inside of the centering cylinder 4. Two or more grab bars 401 are arranged at the bottom of the centering cylinder 4. The lower end of the grab bar 401 is engaged with the bottom of the pouring pipe 2, and the upper end of the grab bar 401 is connected to the centering cylinder 4 through a steel wire rope 402. The pouring pipe 2 is lowered by adjusting the length of the steel wire rope 402.
[0022] This invention features fixed seats 3 installed on both sides of the opening of the foundation pit 1. A centering cylinder 4 is connected to the left and right fixed seats 3 via connecting rods 301 on both sides, positioning the centering cylinder 4 above the center of the foundation pit 1. The discharge end of the pouring guide pipe 2 passes through the centering cylinder 4, thus limiting the position of the pouring guide pipe 2 and preventing it from falling through the inner wall of the foundation pit 1 during lowering, which would cause sand and gravel to continuously fall and accumulate at the bottom of the foundation pit 1, affecting concrete pouring. A grab bar 401 and a steel wire rope 402 are installed at the bottom of the centering cylinder 4. The lower end of the grab bar 401 is engaged with the bottom of the pouring guide pipe 2, supporting it. The steel wire rope 402 is connected to the grab bar 401, and the operator controls the raising and lowering of the discharge end of the pouring guide pipe 2 by controlling the raising and lowering of the steel wire rope 402.
[0023] Furthermore, the top and bottom of the centering cylinder 4 are respectively provided with an outwardly extending first ring 403 and a second ring 404. A threaded rod 405 is provided between the first ring 403 and the second ring 404, and the number of threaded rods 405 is the same as the number of gripping rods 401. A lifting ring 406 is sleeved on the threaded rod 405, and the lifting ring 406 is threadedly connected to the threaded rod 405. The top and bottom of the lifting ring 406 are respectively provided with limiting rings 407, and a through hole is provided on the bottom limiting ring 407. The upper end of the wire rope 402 passes through the through hole, wraps around the surface of the lifting ring 406 multiple times, and is fixedly connected to the lifting ring 406. Under no external force, the lifting ring 406 is located at the bottom of the threaded rod 405. A threaded rod 405 is provided, and a lifting ring 406 is threadedly connected to the threaded rod 405. The upper end of the wire rope 402 is wound around the lifting ring 406. The winding direction is specific and must ensure that when the wire rope 402 is pulled down, i.e., as the wire rope 402 continuously unwinds, the rotation of the lifting ring 406 completes the upward rotation. The lifting principle of the lifting ring 406 is based on a screw drive structure, which converts rotational motion into linear motion to achieve the lifting function, similar to a nut threaded onto a screw; rotating the nut completes the lifting and lowering of the nut relative to the screw. The lifting ring 406 rises when pulling down the wire rope 402, and when it descends, it rotates and winds back around the wire rope 402, causing the lower end of the wire rope 402 to rise. The lifting ring 406 and the lower end of the wire rope 402 exhibit opposite motion trajectories. The lifting ring 406 and the lower end of the wire rope 402 are themselves affected by gravity. In the absence of external force, the lifting ring 406 is more affected by gravity, while the lower end of the wire rope 402 plus the grab bar 401 is less affected by gravity (the above gravity relationship is obtained by setting the weight of the lifting ring 406 and the grab bar 401). In the initial state, the lifting ring 406 descends to the bottom of the threaded rod 405, while at this time, the grab bar 401 and the lower end of the wire rope 402 have just moved to the bottom of the centering cylinder 4. During the lowering of the pouring guide pipe 2, after the discharge end of the pouring guide pipe 2 passes through the centering cylinder 4, it is engaged by the grab rod 401. At this time, the lower end of the pouring guide pipe 2, grab rod 401, and wire rope 402 are subjected to greater gravity, causing the grab rod 401 and pouring guide pipe 2 to continue to descend. However, when the downward pull of the wire rope 402 is fed back to the lifting ring 406, the threaded connection restricts the lifting ring 406 from rising directly, which slows down the rising speed of the lifting ring 406, thereby slowing down the descent speed of the pouring guide pipe 2, thus making the lowering of the pouring guide pipe 2 more stable.After the concrete pouring of the pouring pipe 2 is completed, when retrieving the pouring pipe 2, one method is to manually rotate the lifting ring 406 to pull the grab bar 401 to raise the pouring pipe 2. This method is relatively laborious, but it is achievable given the current weight of the pouring pipe 2. Secondly, another method is to use a device to directly drag the rear end of the pouring pipe 2. After dragging, the lifting ring 406 will automatically reset under the action of gravity.
[0024] like Figures 3-5 As shown, further, the gripper 401 includes a support claw 4012 and a connecting post 4011. The connecting post 4011 is hinged to the support claw 4012, and a coil spring is provided at the hinge. The support claw 4012 is engaged with the bottom of the pouring conduit 2, and the upper end of the connecting post 4011 is connected to the wire rope 402. The gripper 401 includes a support claw 4012 and a connecting post 4011, and a coil spring is provided between the support claw 4012 and the connecting post 4011 to allow the support claw 4012 to rotate. Figure 1 The support claw 4012 and connecting column 4011 in the shown state are in their initial state. At this point, the support claw 4012 and connecting column 4011 maintain this state without external force. The upper end of the connecting column 4011 abuts against the bottom of the centering cylinder 4. After the wire rope 402 tightens the connecting column 4011, the support claw 4012 and connecting column 4011 remain in this state. Figure 1 In the intermediate state, during the lowering of the pouring conduit 2, the discharge ends of pouring conduits 2 of different sizes are squeezed against the support claws 4012, causing the multiple support claws 4012 to rotate to adapt to the size of the pouring conduit 2 and complete the locking of the discharge ends of the pouring conduit 2, and then the pouring conduit 2 continues to be lowered. A hinged connecting column 4011 and support claws 4012 are provided. During the lowering process, the gripping rod 401 adapts to the pouring conduits 2 of different sizes before being lowered, enabling automatic adjustment and gripping of pouring conduits 2 of different sizes.
[0025] Furthermore, a cylindrical groove is provided at the bottom of the centering cylinder 4, and the upper end of the connecting column 4011 is located within the cylindrical groove. During the lowering of the pouring guide pipe 2, before the support claw 4012 engages with the pouring guide pipe 2, although the weight of the pouring guide pipe 2 is not applied to the support claw 4012 and the connecting column 4011, the compression that causes the support claw 4012 to rotate may cause the connecting column 4011 to shift. Therefore, a cylindrical groove is provided so that the connecting column 4011 is located within the cylindrical groove. The inner diameter of the cylindrical groove is the same as the diameter of the connecting column 4011. Only after the support claw 4012 engages with the pouring guide pipe 2 can the connecting column 4011 be lowered out of the cylindrical groove by gravity; before the engagement is completed, the rotation of the support claw 4012 will not be affected. With the cylindrical groove provided, during the retrieval of the pouring guide pipe 2, the connecting column 4011 may not be able to return directly to the cylindrical groove, and manual repositioning is sufficient.
[0026] like Figure 6 As shown, furthermore, the number of gripping rods 401 is three, and the three gripping rods 401 are equally spaced along the circumference of the centering cylinder 4. The three gripping rods 401 provide a more stable clamping connection to the casting guide pipe 2.
[0027] The terms "connection" and "fixing" appearing in this utility model description can refer to fixed connection, processing and forming, welding, or mechanical connection. The specific meaning of the above terms in this utility model should be understood according to the specific circumstances.
[0028] In the description of this utility model, the terms "center", "upper", "lower", "horizontal", "inner", "outer", etc., are used only to indicate the orientation or positional relationship for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A device for lowering a tremie, characterized in that: It includes fixed seats (3) installed on the left and right sides of the opening of the foundation pit (1), and a centering cylinder (4) is provided between the two fixed seats (3). The centering cylinder (4) is located above the middle of the foundation pit (1). The left side of the centering cylinder (4) is connected to the left fixed seat (3) through a connecting rod (301), and the right side of the centering cylinder (4) is connected to the right fixed seat (3) through another connecting rod (301). The pouring pipe (2) passes downward through the inside of the centering cylinder (4). There are two or more grab bars (401) at the bottom of the centering cylinder (4). The lower end of the grab bar (401) is clamped to the bottom of the pouring pipe (2). The upper end of the grab bar (401) is connected to the centering cylinder (4) through a wire rope (402). The pouring pipe (2) is lowered by adjusting the length of the wire rope (402).
2. A device for lowering a placing tube according to claim 1, characterized in that: The top and bottom of the middle cylinder (4) are respectively provided with an outwardly extending first ring (403) and second ring (404), and a threaded rod (405) is provided between the first ring (403) and the second ring (404). The number of threaded rods (405) is the same as the number of gripping rods (401). A lifting ring (406) is fitted on the threaded rod (405). The lifting ring (406) is threadedly connected to the threaded rod (405). Limiting rings (407) are respectively provided at the top and bottom of the lifting ring (406). A through hole is provided on the bottom limiting ring (407). The upper end of the wire rope (402) passes through the through hole and is wound around the surface of the lifting ring (406) multiple times before being fixedly connected to the lifting ring (406). In the absence of external force, the lifting ring (406) is located at the bottom of the threaded rod (405).
3. A device for lowering a placing tube according to claim 1, characterized in that: The gripper (401) includes a support claw (4012) and a connecting post (4011), the connecting post (4011) is hinged to the support claw (4012), and a coil spring is provided at the hinge. The support claw (4012) is snapped into the bottom of the pouring pipe (2), and the upper end of the connecting column (4011) is connected to the wire rope (402).
4. A lowering device for a pouring conduit according to claim 3, characterized in that: The bottom of the centering cylinder (4) is provided with a cylindrical groove, and the upper end of the connecting column (4011) is located in the cylindrical groove.
5. The lowering device for a casting conduit according to claim 1, characterized in that: The number of gripping rods (401) is three, and the three gripping rods (401) are equally spaced along the circumference of the centering cylinder (4).