Post-grouting device for prestressed pipe pile
By installing a post-grouting device with grouting pipes, grouting valves, and protective frames inside the prestressed pipe pile, the problems of insufficient grouting and damage to the guide pipe in the existing technology are solved, thereby improving the bearing capacity of the pile bottom and reducing construction costs.
Patent Information
- Application Number
- CN202422578310.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-10-24
AI Technical Summary
Existing technologies for treating karst caves or soil cavities at the bottom of prestressed concrete pipe piles suffer from problems such as incomplete grouting, back pressure grout overflow, and damage to the guide pipe, leading to insufficient bearing capacity at the pile bottom and high construction costs.
A post-grouting device for prestressed pipe piles is adopted, including a grouting tube, a grouting valve, a protective frame, and a check valve. Post-grouting is performed in the inner cavity of the pipe pile through the grouting tube. The device is fixed by a threaded connector and a U-shaped clamp. The protective frame forms a sealed cavity to protect the grouting valve, and the check valve prevents backflow, ensuring grouting stability and sealing.
It improves the bearing capacity of the pipe pile bottom, reduces construction costs, avoids back pressure overflow, and enhances the stability and compactness of construction.
Smart Images
Figure CN223607860U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a small -bore grouting equipment technical field, concretely relates to a post pressure grouting device for prestressed pipe pile. BACKGROUND
[0002] In prestressed pipe pile construction, there are often more soil holes, karst caves, even string bead type karst caves in stratum, the size, range etc. of karst cave are not easy to determine, and most of the hole is in the form of no filling, half filling, and the filling material is mostly plastic clay, sandy soil etc., the soil is soft, the bearing capacity is low, and it belongs to adverse geological action, which may induce ground subsidence or collapse in engineering construction. The existing construction technology has various treatment methods for karst cave, including grouting, flow state solidified soil filling, low grade concrete filling etc., but it is still impossible to fill the hole densely by using these methods when the pipe pile bottom is located in the karst cave or soil hole, and there will be still gap in the pipe pile bottom, which leads to that the bearing capacity of pile end cannot meet the expected requirement. Most of the disclosed technical solutions are to add a grouting device at the pile end, adopt static pressure pile method, use pile machine to press the pipe pile with the welded grouting device to the design grade, determine the final pressure value through construction grade and effective pile length, use high pressure grouting pump to press the PHC pipe pile through the guide pipe 48 hours after the pile sinking is terminated, but this method has the following disadvantages, (1) the length of single grouting guide pipe is fixed, and the pipe pile is deep, so it needs to be connected, and the sealing degree of the connected position is insufficient, which is easy to cause air leakage and grout leakage, resulting in insufficient pressure, and the grouting at the pile bottom and pile side cannot reach the ideal effect; (2) the grouting guide pipe is single side grouting, and due to the existence of grouting pressure, the cement slurry is injected into the soil body at the pile end and pile side through pressure grouting, so that the soil body is dense, but after the surrounding soil body is grouted, the pressure is removed, and the pressure in the soil body will cause the cement slurry to be back-pressed to the outside through the grouting guide pipe, resulting in insufficient grouting amount at the pile bottom and pile side; (3) the end of the grouting guide pipe is fixed with the pile tip, but it is not airtight space, and there is no protection device, and the soil resistance at the pile end will damage the end guide pipe in the process of pipe pile sinking. CONTENT OF THE UTILITY MODEL
[0003] The utility model aims at providing a post pressure grouting device for prestressed pipe pile, which can perform post grouting operation on the space at the bottom of the pipe pile, improve the bearing capacity of the pipe pile, reduce the length of the pipe pile, reduce the engineering cost, has simple and compact structure, is convenient for construction operation, cannot cause back pressure overflow phenomenon, and has high practicality.
[0004] In order to achieve the above object, the utility model adopts the following technical scheme:
[0005] The utility model relates to a post pressure grouting device for prestressed pipe pile, including setting in the grouting spout of pipe pile inner chamber, fixed setting in the grouting valve of pile tip bottom, setting in the protection frame of grouting valve outside and setting on the check valve of grouting spout, grouting spout one end with grouting valve sealed connection, the protection frame one end fixed mounting in the bottom of pile tip, through grouting spout and grouting valve inject slurry into pipe pile bottom.
[0006] Preferably, the grouting spout is spliced by several pipe segments, and the adjacent two pipe segments are fixedly connected by a threaded connector.
[0007] Preferably, several U-shaped clamps are arranged in the pipe pile, and the grouting spout passes through the U-shaped clamps.
[0008] Preferably, the pile tip is in the shape of a cross, and the protection frame is fixedly installed on one side of the cross-shaped pile tip to form a rectangular closed protection cavity.
[0009] Preferably, a plurality of slurry outlets are arranged on the protection frame.
[0010] Preferably, the slurry outlet is a circular hole with a diameter of 1-2 cm.
[0011] Preferably, a plurality of grouting holes are arranged on the grouting valve.
[0012] Preferably, the bottom of the grouting valve is located above the bottom of the pile tip.
[0013] Preferably, a plugging member is arranged on the grouting hole.
[0014] In the utility model, the device can be used for post pressure grouting reinforcement work on the bottom of the pipe pile in which low-grade concrete has been poured in the soil cave, to fill the pores in the soil and cave, enhance the compactness of the pile bottom bearing layer, improve the bearing capacity of the pipe pile bottom, shorten the pre-buried depth of the pipe pile, and reduce the construction cost.
[0015] The grouting spout is buried in the inner chamber of the pipe pile and is fixed and constrained by the U-shaped clamps, so that the grouting spout can be prevented from shaking in the pipe pile, the check valve can prevent the cement slurry from flowing backward due to the pressure at the bottom of the pipe pile, and the stability of construction is ensured. The adjacent two pipe segments are fixedly connected by the threaded connector, so that the connection is sealed and reliable, and the grouting pressure is ensured. The protection frame and the pile tip form a closed protection cavity, which can prevent the grouting valve from being damaged when the pipe pile sinks and contacts the soil, and can protect the grouting valve. BRIEF DESCRIPTION OF DRAWINGS
[0016] Fig. 1 It is an axial side view of the pile tip structure of the utility model;
[0017] Fig. 2It is the pile tip structure front view schematic diagram of the utility model;
[0018] Fig. 3 It is the pile tip structure section view schematic diagram of the utility model;
[0019] Fig. 4 It is the pile tip structure plan view schematic diagram of the utility model;
[0020] Fig. 5 It is the pile tip structure bottom view schematic diagram of the utility model;
[0021] Fig. 6 It is the pipe pile structure schematic diagram of the utility model;
[0022] In the drawing: 1, pipe pile; 2, grouting small pipe; 3, pile tip; 4, grouting valve; 5, protection frame; 6, check valve; 7, threaded connector; 8, U-shaped card; 9, grout hole; 10, grouting hole. Specific implementation
[0023] The utility model is further explained in connection with the drawings as follows:
[0024] As Figs. 1-6 The utility model discloses a post grouting device for prestressed pipe pile, which comprises a grouting small pipe 2 arranged in the inner cavity of a pipe pile 1, a grouting valve 4 fixedly arranged at the bottom of a pile tip 3, a protection frame 5 arranged outside the grouting valve 4 and a check valve 6 arranged on the grouting small pipe 2.
[0025] One end of the grouting small pipe 2 is sealingly and fixedly connected with the grouting valve 4, and the other end of the grouting small pipe 2 is 20 cm higher than the top of the pipe pile 1 or flush with the top of the pipe pile 1. The check valve 6 can prevent the cement slurry from being reversely pressed out due to the bottom pressure after grouting is completed, thereby ensuring the stability of grouting. A plurality of grouting holes 10 are arranged on the grouting valve 4, and the grouting valve 4 is used for grouting outward through the grouting holes 10 when the grouting valve 4 is opened. The bottom of the grouting valve 4 is located above the bottom of the pile tip 3, and the protection frame 5 can wrap the grouting valve 4. A plugging member is arranged on the grouting hole 10, and in this embodiment, the plugging member is 2-3 layers of adhesive tapes adhered to the outer side of the grouting hole 10. The adhesive tapes can be damaged by pressure during grouting operation, and the grouting operation can be normally carried out.
[0026] The protection frame 5 is fixedly installed at one end of the pile tip 3 which is arranged at the bottom of the pipe pile 1. During operation, the mortar pump is used to inject mortar into the bottom of the pipe pile 1 through the grouting pipe 2 and the grouting valve 4. In the embodiment, the pile tip 3 is in the shape of a cross, and the protection frame 5 is fixedly installed at one side of the cross-shaped pile tip 3 by welding to form a rectangular closed protection cavity, and the grouting valve 4 is arranged in the cavity. During the sinking of the pipe pile 1, the rectangular closed protection cavity can prevent the soil resistance at the pile tip from being damaged.
[0027] A plurality of grout outlets 9 are arranged on the side wall of the protection frame 5. The grout outlets 9 are circular holes with a diameter of 1-2 cm. The grout outlets 9 are used to discharge the mortar injected by the grouting valve 4. The grout outlets 9 are arranged on the side wall, and only a small amount of soil enters the rectangular closed protection cavity through the grout outlets 9 during the sinking of the pipe pile 1, so as to reduce the counter pressure of the soil during the sinking of the pile and protect the grouting valve 4.
[0028] The above embodiment is only a number of descriptions of the concept and implementation of the present application, and does not limit the present application. Under the concept of the present application, the technical solutions without substantial changes are still within the protection scope.
Claims
1. A post grouting device for prestressed pipe pile, characterized in that: The utility model relates to a pipe pile grouting device, including grouting small pipe (2) set in the inner chamber of pipe pile (1), fixedly set grouting valve (4) in the bottom of pile tip (3), protective frame (5) set in the outside of grouting valve (4) and check valve (6) set on grouting small pipe (2), one end of grouting small pipe (2) is sealedly connected with grouting valve (4), one end of protective frame (5) is fixedly installed in the bottom of pile tip (3), through grouting small pipe (2) and grouting valve (4) grouting slurry is injected into the bottom of pipe pile (1).
2. The post grouting device for prestressed pipe pile according to claim 1, characterized in that: The grouting small pipe (2) is spliced by several pipe sections, and the adjacent two pipe sections are sealingly and fixedly connected through a threaded connector (7), and the threaded connector (7) is a special connector of the grouting small pipe (2).
3. The post grouting device for prestressed pipe pile according to claim 2, characterized in that: Several U-shaped clamps (8) are arranged in the pipe pile (1), and the grouting small pipe (2) passes through the U-shaped clamps (8).
4. The post tensioned pipe pile post grouting device according to claim 1, characterized in that: The pile tip (3) is in a cross shape, the protective frame (5) is fixedly installed on one side of the cross-shaped pile tip (3) to form a rectangular closed protective cavity.
5. The post grouting device for prestressed pipe pile according to claim 1 or 4, characterized in that: A plurality of grouting holes (9) are arranged on the protective frame (5).
6. The post grouting device for prestressed pipe pile according to claim 5, characterized in that: The grouting hole (9) is a circular hole with a diameter of 1-2 cm.
7. The post grouting device for prestressed pipe pile according to claim 1, characterized in that: A plurality of grouting holes (10) are arranged on the grouting valve (4).
8. The post tensioned pipe pile post grouting device according to claim 1, characterized in that: The bottom of the grouting valve (4) is located above the bottom of the pile tip (3).
9. The post tensioned pipe pile post grouting device according to claim 7, characterized in that: A plugging member is arranged on the grouting hole (10).