Cast-in-place pile post-grouting clear-water-splitting-free device
By designing a device including bottom pipe, extension pipe and anti-backflow assembly, the problem of increasing the clean water splitting step in grouting after filling piles is solved, and the effect of avoiding clean water splitting, preventing backflow and easy connection to the steel cage is achieved, and the pile quality is improved.
Patent Information
- Application Number
- CN202421556550.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-03
AI Technical Summary
In the existing post-pour grouting process of casting piles, the clean water splitting step increases operational complexity and may lead to slurry backflow and pile quality impacts.
A device including a bottom pipe, an extension pipe and an anti-reflow assembly is designed, and a long grouting pipe is formed by docking through the internal threaded connection port, and the pile body is directly split by high-pressure grouting to prevent the slurry from pouring back.
It achieves no clear water splitting, reduces operating steps, prevents slurry from pouring back, improves pile quality, and facilitates docking of steel cages to prevent slurry leakage and overflow.
Smart Images
Figure CN222948997U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pile foundation construction equipment, in particular to a device for post-grouting of cast-in-place piles without clear water splitting. Background Art
[0002] Post-grouting of bored piles refers to the process of injecting cement slurry through a grouting conduit preset in the pile body a certain period of time after the bored pile is formed, so that the soil at the pile end and pile side is reinforced, thereby increasing the bearing capacity of the single pile and reducing settlement.
[0003] Clean water splitting is a common operation method of post-grouting process. When the initial grouting is in the initial setting state, clean water is injected through the grouting pipe, and the concrete of the initial pile or the grouting mixture or the grouting mixture is split from the inside by high-pressure water, and then post-grouting is performed to make the split pile body concrete and the post-injected slurry solidify into one, forming a pile body with roots. This operation method not only adds a step of high-pressure water injection, but also when the pressurization stops, the pressure inside the pile body will also force clean water back through the grouting pipe, and the clean water will dilute part of the slurry injected later, affecting the final quality of the pile, and does not have the function of preventing backflow and avoiding clean water splitting.
[0004] Now, a new type of post-grouting device for bored piles without clean water splitting is proposed to solve the above problems. Utility Model Content
[0005] The utility model aims to provide a device for post-grouting of cast-in-place piles without water splitting, so as to solve the problem that the above-mentioned background technology does not have the function of preventing backflow and avoiding water splitting.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for post-grouting of cast-in-place piles without splitting with clean water, comprising a bottom pipe and an extension pipe, wherein the bottom ends of the bottom pipe and the extension pipe are respectively welded with internal threaded connecting ports, and a backflow prevention component that does not require splitting with clean water is arranged below the bottom pipe.
[0007] The backflow prevention assembly includes a bottom shell, which is arranged below the bottom pipe. Slurry discharge ports are respectively arranged at the front and rear ends of the bottom shell. A sealing plug is vertically arranged inside the bottom shell. A sealing ring is glued to the outer ring of the bottom end of the sealing plug. A hard spring is installed at the bottom end of the bottom shell. An external threaded connection port is welded at the top end of the bottom shell. A limiting ring is fixedly connected to the bottom end outside the external threaded connection port.
[0008] Preferably, the outer diameter of the sealing plug is matched with the inner diameter of the bottom shell, and the sealing plug can slide up and down along the inside of the bottom shell.
[0009] Preferably, the outer wall of the sealing ring is in contact with the inner wall of the bottom shell, and the bottom shell and the sealing ring are not connected.
[0010] Preferably, the top end of the hard spring is connected to the bottom end of the sealing plug, the external thread of the external threaded connection port matches the internal thread of the internal threaded connection port, the interior of the bottom tube, the internal threaded connection port, the bottom shell and the extension tube are connected, and the inner diameter and outer diameter of the external threaded connection port are the same as the inner diameter and outer diameter of the bottom tube and the extension tube.
[0011] Preferably, three groups of fixing ears are welded to the front and rear ends of the bottom tube and the extension tube, respectively, a steel cage connecting anchor rod is inserted inside the fixing ears, and a fixing nut is sleeved outside the steel cage connecting anchor rod.
[0012] Preferably, the outer diameter of the steel cage connecting anchor rod is consistent with the inner diameter of the fixing ear piece, and the outer thread of the steel cage connecting anchor rod is consistent with the inner thread of the fixing ear piece and the fixing nut.
[0013] Preferably, a pipe opening nesting tube is welded to the top of the inner threaded connection port, and threads are respectively provided on the tops of the outer parts of the bottom tube and the extension tube.
[0014] Preferably, the bottom tube and the extension tube have the same specifications and dimensions, the threads on the top of the outside of the bottom tube and the extension tube match the threads inside the internal threaded connection port, and the outer diameter of the tube nesting tube is the same as the inner diameter of the bottom tube and the extension tube.
[0015] Compared with the prior art, the utility model has the following beneficial effects: the post-grouting and water-free splitting device for cast-in-place piles not only realizes the function of preventing backflow and water-free splitting, but also realizes the function of facilitating the connection of steel cages and preventing leakage and overflow of grout at the connection position of the upper and lower pipes;
[0016] (1) The bottom shell, slurry outlet, sealing plug, sealing ring, hard spring, external thread connection port and limiting ring are provided. When in use, the bottom pipe and the extension pipe are butt-jointed and lengthened through the internal thread connection port to form a long grouting pipe. The pipe fitting is fixed on the inner side of the steel cage. During the secondary grouting, the slurry is poured downward along the pipe port at the top of the extension pipe through the high-pressure grouting equipment. The high-pressure slurry flows downward along the extension pipe and the bottom pipe. The pressure presses the sealing plug downward to make it retreat to the bottom of the bottom shell, exposing the slurry outlet, so that the slurry directly enters the initial setting pile body to form a split, reducing the step of water splitting. The slurry is directly split. As the grouting stops, the sealing plug of the pressure moves upward under the action of the hard spring, blocking the slurry outlet and the opening at the bottom of the external thread connection port to prevent the slurry from flowing back. The external thread connection port and the limiting ring are used for the butt joint of the bottom shell and the pipeline, realizing the function of preventing backflow and avoiding water splitting.
[0017] (2) By providing a fixing ear, a steel cage connecting anchor rod and a fixing nut, when the bottom pipe, the extension pipe and the steel cage are connected, multiple sets of steel cage connecting anchor rods are screwed in along the fixing ear, and the position of the contact between the hook at the end of the steel cage connecting anchor rod and the steel cage can be adjusted through the thread. The hook is hooked on the main reinforcement to facilitate subsequent welding or wire binding. The fixing nut further reinforces the steel cage connecting anchor rod to prevent it from loosening and falling off, thereby realizing the function of facilitating the connection of the steel cage;
[0018] (3) By providing a bottom pipe, an internal threaded connection port, an extension pipe and a pipe-end nested pipe, when the bottom pipe and the extension pipe are connected, or when the extension pipes are connected, the pipe at the bottom inserts the pipe end into the internal threaded connection port of the upper pipe, and the pipe-end nested pipe inside the internal threaded connection port is inserted into the pipe end position of the lower pipe. By adding the nested pipes, the overflow path of the slurry is extended, and the probability of the slurry overflowing or leaking from the connection position under high pressure is further reduced, thereby ensuring the pressure balance in the pipe and realizing the function of preventing the slurry from leaking or overflowing at the connection position of the upper and lower pipes. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a front view structural schematic diagram of the utility model;
[0020] Figure 2 It is a schematic diagram of an enlarged front cross-sectional structure of the bottom shell of the utility model;
[0021] Figure 3 For the utility model Figure 1 A partial cross-section at the center is an enlarged structural diagram;
[0022] Figure 4 This is a side view of the extension tube structure of the utility model;
[0023] Figure 5 It is a schematic diagram of the front cross-sectional structure of the internal thread connection port of the utility model.
[0024] In the figure: 1. bottom pipe; 2. internal thread connection; 3. bottom shell; 4. slurry discharge port; 5. sealing plug; 6. sealing ring; 7. hard spring; 8. external thread connection; 9. limiting ring; 10. fixing ear piece; 11. steel cage connecting anchor rod; 12. fixing nut; 13. extension pipe; 14. pipe mouth nested pipe. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] Example 1: Please refer to Figure 1-5 A device for post-grouting of a cast-in-place pile without water splitting comprises a bottom pipe 1 and an extension pipe 13. The bottom ends of the bottom pipe 1 and the extension pipe 13 are respectively welded with internal thread connection ports 2. A backflow prevention component without water splitting is arranged below the bottom pipe 1.
[0027] See also Figure 1-5 A device for post-grouting of cast-in-place piles without water splitting also includes an anti-backflow component, which includes a bottom shell 3, which is arranged below the bottom pipe 1, and slurry discharge ports 4 are respectively arranged at the front and rear ends of the bottom shell 3, and a sealing plug 5 is vertically arranged inside the bottom shell 3, and a sealing ring 6 is glued to the outer ring of the bottom end of the sealing plug 5, and a hard spring 7 is installed at the bottom end of the bottom shell 3, and an external thread connection port 8 is welded at the top end of the bottom shell 3, and a limit ring 9 is fixedly connected to the bottom end of the external thread connection port 8;
[0028] The outer diameter of the sealing plug 5 is adapted to the inner diameter of the bottom shell 3, and the sealing plug 5 can slide up and down along the inside of the bottom shell 3. The outer wall of the sealing ring 6 fits the inner wall of the bottom shell 3, the bottom shell 3 and the sealing ring 6 are not connected, the top of the hard spring 7 is connected to the bottom end of the sealing plug 5, the outer thread of the external threaded connection port 8 matches the inner thread of the internal threaded connection port 2, the bottom tube 1, the internal threaded connection port 2, the bottom shell 3, and the extension tube 13 are connected, the inner diameter and outer diameter of the external threaded connection port 8 are the same as the inner diameter and outer diameter of the bottom tube 1 and the extension tube 13, and the slurry can be directly injected for splitting, avoiding water splitting and preventing slurry backflow;
[0029] Specifically, Figure 1 and Figure 2 As shown, the high-pressure slurry flows downward along the extension pipe 13 and the bottom pipe 1, and the pressure presses the sealing plug 5 downward, causing it to retreat to the bottom of the bottom shell 3, exposing the slurry discharge port 4, so that the slurry directly enters the initially set pile body to form a split, reducing the steps of clean water splitting, and using slurry direct splitting. As the grouting stops, the sealing plug 5 with pressure is displaced upward under the action of the hard spring 7, blocking the slurry discharge port 4 and the opening at the bottom of the external threaded connection port 8 to prevent slurry backflow. The external threaded connection port 8 and the limit ring 9 are used for connecting the bottom shell 3 and the pipeline.
[0030] Embodiment 2: Three groups of fixing lugs 10 are welded to the front and rear ends of the bottom pipe 1 and the extension pipe 13, respectively. A steel cage connecting anchor rod 11 is inserted into the fixing lug 10, and a fixing nut 12 is sleeved on the outside of the steel cage connecting anchor rod 11. The outer diameter of the steel cage connecting anchor rod 11 is consistent with the inner diameter of the fixing lug 10, and the outer thread of the steel cage connecting anchor rod 11 is consistent with the inner thread of the fixing lug 10 and the fixing nut 12, so as to facilitate the connection between the pipe and the steel cage;
[0031] Specifically, Figure 3 and Figure 4 As shown, multiple groups of steel cage connecting anchor rods 11 are screwed in along the fixing ear pieces 10. The contact position between the hook at the end of the steel cage connecting anchor rod 11 and the steel cage can be adjusted through the thread. The hook is hooked on the main reinforcement to facilitate subsequent welding or wire binding. The fixing nut 12 further reinforces the steel cage connecting anchor rod 11 to prevent it from loosening and falling off.
[0032] Embodiment 3: A pipe-end nested tube 14 is welded to the top of the inner threaded connection port 2, and threads are respectively formed on the tops of the outer ends of the bottom tube 1 and the extension tube 13. The bottom tube 1 and the extension tube 13 have the same specifications and dimensions, and the threads on the tops of the outer ends of the bottom tube 1 and the extension tube 13 match the threads inside the inner threaded connection port 2. The outer diameter of the pipe-end nested tube 14 is the same as the inner diameter of the bottom tube 1 and the extension tube 13, and the connection is more tightly sealed, and slurry leakage and overflow are not likely to occur.
[0033] Specifically, Figure 1 and Figure 5 As shown, the pipe mouth nested tube 14 inside the internal threaded connection port 2 is inserted into the pipe mouth position of the lower pipe. By adding the nested tube, the overflow path of the slurry is extended, and the probability of the slurry overflowing or leaking from the connection position under high pressure is further reduced, thereby ensuring the pressure balance in the pipeline.
[0034] Working principle: When the utility model is in use, first, the bottom pipe 1 and the extension pipe 13 are butt-jointed and lengthened through the internal threaded connection port 2 to form a long grouting pipe. The pipe fittings are fixed on the inner side of the steel cage. During the secondary grouting, the slurry is poured downward along the pipe port at the top of the extension pipe 13 through the high-pressure grouting equipment. The high-pressure slurry flows downward along the extension pipe 13 and the bottom pipe 1. The pressure presses the sealing plug 5 downward to make it retreat to the bottom of the bottom shell 3, exposing the slurry discharge port 4, so that the slurry directly enters the initially set pile body to form a split, reducing the step of splitting with clean water. Direct splitting with slurry is adopted. As the grouting stops, the sealing plug 5 with its pressure moves upward under the action of the hard spring 7, blocking the slurry discharge port 4 and the opening at the bottom of the external threaded connection port 8 to prevent slurry backflow. The external threaded connection port 8 and the limit ring 9 are used for butt-jointing the bottom shell 3 and the pipeline. When docking the bottom pipe 1, the extension pipe 13 and the steel cage, take a plurality of sets of steel cage connection anchor rods 11 and screw them in along the fixed ear piece 10. The position where the hook at the end of the steel cage connection anchor rod 11 contacts the steel cage can be adjusted through the thread. The hook is hooked on the main reinforcement to facilitate subsequent welding or wire tying. The fixing nut 12 further reinforces the steel cage connection anchor rod 11 to prevent it from loosening and falling off. When docking the bottom pipe 1 and the extension pipe 13, or docking the extension pipe 13 and the extension pipe 13, the pipe at the bottom inserts the pipe mouth into the internal threaded connection port 2 of the upper pipe, and the pipe mouth nested pipe 14 inside the internal threaded connection port 2 is inserted into the pipe mouth position of the lower pipe. By adding the nested pipe, the path for the slurry to overflow is extended, and the probability of the slurry overflowing or leaking from the connection position under high pressure is further reduced, thereby ensuring the pressure balance in the pipe.
[0035] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
Claims
1. A device for post-grouting of cast-in-place piles without water splitting, comprising a bottom pipe (1) and an extension pipe (13), characterized in that: The bottom ends of the bottom pipe (1) and the extension pipe (13) are respectively welded with internal thread connection ports (2), and a backflow prevention component that avoids clean water splitting is arranged below the bottom pipe (1); The backflow prevention component comprises a bottom shell (3), wherein the bottom shell (3) is arranged below the bottom pipe (1), and slurry discharge ports (4) are respectively arranged at the front and rear ends of the bottom shell (3), a sealing plug (5) is vertically arranged inside the bottom shell (3), and a sealing ring (6) is glued to the outer ring of the bottom end of the sealing plug (5), a hard spring (7) is installed at the bottom end of the bottom shell (3), and an external threaded connection port (8) is welded at the top end of the bottom shell (3), and a limiting ring (9) is fixedly connected to the bottom end of the external threaded connection port (8).
2. The device for post-grouting of cast-in-place piles without water splitting according to claim 1, characterized in that: The outer diameter of the sealing plug (5) is matched to the inner diameter of the bottom shell (3), and the sealing plug (5) can slide up and down along the inside of the bottom shell (3).
3. The device for post-grouting of cast-in-place piles without water splitting according to claim 1, characterized in that: The outer wall of the sealing ring (6) is in contact with the inner wall of the bottom shell (3), and the bottom shell (3) and the sealing ring (6) are not connected.
4. The device for post-grouting of cast-in-place piles without water splitting according to claim 1, characterized in that: The top end of the hard spring (7) is connected to the bottom end of the sealing plug (5), the external thread of the external threaded connection port (8) matches the internal thread of the internal threaded connection port (2), the interior of the bottom tube (1), the internal threaded connection port (2), the bottom shell (3), and the extension tube (13) are connected, and the inner diameter and outer diameter of the external threaded connection port (8) are the same as the inner diameter and outer diameter of the bottom tube (1) and the extension tube (13).
5. The device for post-grouting of cast-in-place piles without water splitting according to claim 1, characterized in that: Three groups of fixing lugs (10) are respectively welded to the front and rear ends of the bottom tube (1) and the extension tube (13); a steel cage connecting anchor rod (11) is inserted into the interior of the fixing lugs (10); and a fixing nut (12) is sleeved on the exterior of the steel cage connecting anchor rod (11).
6. The device for post-grouting of cast-in-place piles without water splitting according to claim 5, characterized in that: The outer diameter of the steel cage connecting anchor rod (11) is consistent with the inner diameter of the fixing ear piece (10), and the outer thread of the steel cage connecting anchor rod (11) is consistent with the inner thread of the fixing ear piece (10) and the fixing nut (12).
7. The device for post-grouting of cast-in-place piles without water splitting according to claim 1, characterized in that: A pipe opening nesting pipe (14) is welded to the top end of the internal threaded connection port (2), and threads are respectively formed on the top ends of the external ends of the bottom pipe (1) and the extension pipe (13).
8. The device for post-grouting of cast-in-place piles without water splitting according to claim 7, characterized in that: The bottom tube (1) and the extension tube (13) have the same specifications and dimensions; the threads on the top of the outside of the bottom tube (1) and the extension tube (13) match the threads inside the internal threaded connection port (2); and the outer diameter of the tube port nesting tube (14) is the same as the inner diameter of the bottom tube (1) and the extension tube (13).