Grouting pipe for liquefied sandy soil foundation
By designing a combination of grouting core tube and long tube bag, the problems of slurry loss and uneven grouting in liquefied sand foundation are solved, uniform reinforcement effect and low-cost grouting are achieved, and it is suitable for grouting reinforcement of liquefied sand foundation.
Patent Information
- Application Number
- CN202422943644.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Traditional grouting devices have problems with slurry loss and uneven grouting effect in liquefied sand foundations. It is difficult to use single-liquid cement slurry, and the grouting process and parameters are demanding.
A grouting pipe is designed, which includes a grouting core pipe and a long tube bag. The long tube bag is put on the outside of the pipe and is divided into multiple annular filling cavities by sutures. The slurry outlet is close to the insertion head. The cement slurry is filled in the bag along the grouting hole to form a uniform column-like support.
The method realizes uniform filling of cement slurry in liquefied sand foundation, avoids loss, has good grouting effect, reduces the requirements for process and parameters, can use single-liquid cement slurry, is low in cost and easy to use.
Smart Images
Figure CN223410150U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of foundation grouting reinforcement, in particular to a grouting pipe for liquefying sand foundation. Background Art
[0002] Sand liquefaction refers to the phenomenon in which saturated loose silt and fine sand suddenly break down under vibration and assume a liquid state. This change in state occurs due to increased pore water pressure and decreased effective stress. The mechanism is that saturated loose silt and fine sand tend to move and densify under vibration, shifting the stress load from the sand skeleton to the water. Due to the poor permeability of silt and fine sand, pore water pressure increases dramatically. When the pore water pressure reaches the total stress value, the effective stress drops to zero, the particles become suspended in water, and the sand liquefies.
[0003] At present, the reinforcement methods for liquefied sandy foundations mainly include soil consolidation, soil improvement, vibration reinforcement, underground reinforcement, structural design, etc. Among them, although grouting reinforcement in underground reinforcement can achieve foundation reinforcement by filling the gaps between foundation soil particles, for liquefied sandy foundations, since the particles are suspended in water, when using traditional grouting equipment, there are significant slurry loss and uneven grouting effect. It also has high requirements for grouting technology and parameters, and it is difficult to use single-liquid cement slurry. Utility Model Content
[0004] The purpose of the utility model includes providing a grouting pipe for liquefying sand foundation to solve the problems described in the background technology.
[0005] In order to achieve the above purpose, the utility model has the following technical solutions:
[0006] The utility model provides a grouting pipe for liquefying sand foundation, comprising a grouting core pipe and a long tube bag, wherein the grouting core pipe comprises a pipe and an insertion head connected to the lower end of the pipe, and at least one slurry outlet is provided on the pipe wall of the pipe, and the slurry outlet is close to the insertion head;
[0007] After the long-tube bag is put on the outside of the tube, the lower end is fixedly connected to the outside of the tube near the upper edge of the slurry outlet. The upper end of the long-tube bag is turned down to be lower than the lower edge of the slurry outlet and then connected to the tube, or inserted into the outside of the head. After such connection, the long-tube bag forms an inner bag body close to the tube and an outer bag body away from the tube.
[0008] Preferably, the outer surface of the long tube bag is provided with a rubber band, and the rubber band is used to wrap the long tube bag tightly against the tube.
[0009] Preferably, the diameter of the long cylindrical bag is larger than the diameter of the insertion head.
[0010] Preferably, the long tube bag is provided with a plurality of circles of sutures in the radial direction, and the sutures are used to separate the gap between the inner bag body and the outer bag body into a plurality of annular filling cavities.
[0011] Preferably, the insertion head has a cone shape with the tip facing downward.
[0012] Preferably, the diameter of the upper end of the insertion head is larger than the outer diameter of the tube.
[0013] Preferably, the number of the pulp outlets is 3 to 6.
[0014] Preferably, the tube is made of a metal tube.
[0015] Preferably, the length of the long cylindrical bag is equal to the depth of the grouting hole.
[0016] Preferably, the long tubular bag is made of cotton cloth.
[0017] Preferably, the lower end of the long tube bag is connected to the pipe through a pipe clamp.
[0018] Preferably, the upper end of the long tubular bag is connected to the lower end of the tube via an elastomeric ring with an inner diameter smaller than the diameter of the tube.
[0019] Preferably, the elastomeric ring is a rubber ring.
[0020] Due to the adoption of the above technical solution, the advantages of the utility model are:
[0021] 1. When the grouting pipe for liquefied sandy foundation provided by the utility model is inserted into the grouting hole for grouting, the injected cement slurry is mainly wrapped by the long tube bag on the outside of the pipe, and is mainly filled in the long tube bag according to the direction of the grouting hole, which can form a uniform column-like support reinforcement. Unlike the traditional grouting pipe for grouting in the liquefied sandy foundation, there will be no significant slurry loss, uneven grouting effect, high requirements for grouting process and parameters, and difficulty in using single-liquid cement slurry and other problems.
[0022] 2. The long tube bag provided by the utility model is provided with multiple loops of stitches, which divide the gap between the inner bag body and the outer bag body of the long tube bag into multiple annular filling cavities. The cement slurry flowing out of the slurry outlet first flows into the filling cavity at the bottom. When the amount of cement slurry injected reaches the preset pressure, the lowest stitches are stretched open, and the injected cement slurry continues to fill the filling cavity layer by layer from bottom to top, and the grouting and reinforcement effect is good.
[0023] 3. The long tube bag provided by the utility model can be expanded by the injected cement slurry at the mouth of the outer bag body after the grouting starts and squeezed at the bottom of the grouting hole. The outer peripheral surface of the outer bag body is squeezed close to the wall of the grouting hole by the cement slurry. The continuously injected slurry fills the gap between the inner bag body and the outer bag body and is difficult to overflow the grouting hole. At the same time, under the squeezing of the continuously injected slurry, the grouting core tube drives the mouth of the inner bag body to gradually rise.
[0024] 4. The utility model has a simple structure, low cost and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.
[0026] Figure 1 A schematic front view of a grouting pipe for liquefying a sandy foundation provided by an embodiment of the present utility model;
[0027] Figure 2 for Figure 1 Axial half-section diagram of
[0028] Figure 3 For the general Figure 1 A schematic diagram of a grouting pipe for liquefying a sandy foundation after being inserted into a grouting hole is provided;
[0029] Figure 4 This is a schematic diagram of the state after a certain amount of cement slurry is injected through the pipe.
[0030] In the figure: 1. Elastomer ring; 2. Pipe clamp; 3. Cement slurry; 4. Mud water; 10. Grouting core tube; 11. Pipe; 111. Slurry outlet; 12. Insertion head; 20. Long tube bag; 21. Inner bag body; 22. Outer bag body; 23. Separating suture; 24. Filling cavity; 100. Grouting pipe; 200. Grouting hole. DETAILED DESCRIPTION
[0031] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", "left", "right", "front", "back", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.
[0032] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.
[0033] The specific implementation method is now described as follows:
[0034] The present invention provides an embodiment of a grouting pipe 100 for liquefying sand foundation, see Figure 1 、 Figure 2 , including a grouting core tube 10 and a long tube bag 20, the grouting core tube 10 includes a tube 11 and an insertion head 12 connected to the lower end of the tube 11, four slurry outlets 111 are evenly opened at the same height on the tube wall of the tube 11, the four slurry outlets 111 are close to the insertion head 12, the insertion head 12 is in the shape of a cone with the tip facing downward, and the upper end diameter is larger than the outer diameter of the tube 11;
[0035] After the long-tube bag 20 is put on the outside of the tube 11, the lower end is close to the upper edge of the slurry outlet 111 and is fixedly connected to the outside of the tube 11 through a pipe clamp. After the upper end of the long-tube bag 20 is turned down to below the lower edge of the slurry outlet 111, it is tied to the outside of the tube 11 through a rubber ring. The long-tube bag 20 is also provided with multiple circles of sutures 23 in the radial direction. The sutures 23 divide the gap between the inner bag body 21 and the outer bag body 22 into multiple annular filling cavities 24.
[0036] In this embodiment, the long tube bag 20 is made of ordinary cotton cloth, the length of the long tube bag is equal to the depth of the grouting hole, and the diameter of the long tube bag 20 is larger than the diameter of the insertion head 12; the tube 11 is made of steel pipe.
[0037] The principle of this utility model to realize convenient grouting reinforcement of liquefied sand foundation:
[0038] When the grouting pipe 100 provided by the present invention is inserted into the grouting hole 200 in the liquefied sand foundation for grouting, the injected cement slurry 3 is primarily enclosed by the long tube bag 20 sleeved outside the pipe 11 and primarily fills the long tube bag 20 along the direction of the grouting hole 200, thereby forming a uniform column-like support reinforcement. During the grouting process, the slurry is difficult to lose, and its distribution is not easily affected by the slurry composition and viscosity. Therefore, the requirements for grouting process and parameters are low. A single-liquid cement slurry 3 can also be used, enabling convenient and low-cost grouting.
[0039] When the present invention is used, a grouting pump is connected between the upper end of the pipe 11 on the grouting pipe 100 provided by the present invention and the cement slurry storage tank through a grouting pipe, and then the insertion head 12 of the grouting pipe 100 is directed toward the drilled grouting hole 200 and inserted to the bottom, and then the grouting pump is turned on to grout to the set pressure, or until the long tube bag 20 is exposed to the grouting hole 200, and the grouting is completed. Finally, the exposed long tube bag 20 is cut off radially, and the pipe clamp is loosened to remove the remaining section of the long tube bag 20 connected to the lower end of the pipe.
[0040] When the grouting core pipe 10 needs to be used again, a new long-tube bag 20 with the same depth as the grouting hole 200 is put on the outside of the pipe 11, and the lower end of the long-tube bag 20 close to the upper edge of the slurry outlet 111 is first fixed to the outside of the pipe 11 with a pipe clamp, and then the upper end of the long-tube bag 20 is turned down to below the lower edge of the slurry outlet 111 and tied to the outside of the pipe 11 with a rubber ring. Note that after both ends of the long-tube bag 20 are fixed, keep the long-tube bag 20 stretched relatively flat (the length at this time is about half of the original length). In order to prevent the long-tube bag 20 from rubbing against the wall of the grouting hole 200 during the process of inserting the grouting pipe 100 into the grouting hole 200, it is best to use a rubber band or a string to tie the long-tube bag 20 close to the pipe 11.
[0041] The above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention may be implemented. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. This list of all possible embodiments is not exhaustive. Any obvious variations or modifications arising from the technical solution of the present invention remain within the scope of protection of the present invention.
Claims
1. A grouting pipe (100) for liquefying sandy soil foundation, characterized in that: The invention comprises a grouting core tube (10) and a long tube bag (20), wherein the grouting core tube (10) comprises a tube (11) and an insertion head (12) connected to the lower end of the tube (11), and at least one slurry outlet (111) is provided on the tube wall of the tube (11), and the slurry outlet (111) is close to the insertion head (12); After the long tube bag (20) is put on the outside of the tube (11), the lower end is fixedly connected to the outside of the tube (11) near the upper edge of the pulp outlet (111), and the upper end of the long tube bag (20) is turned down to be lower than the lower edge of the pulp outlet (111) and then connected to the tube (11), or inserted into the outside of the head (12).
2. The grouting pipe (100) for liquefying sandy soil foundation according to claim 1, characterized in that: The diameter of the long tube bag (20) is larger than the diameter of the insertion head (12).
3. The grouting pipe (100) for liquefying sandy soil foundation according to claim 1 or 2, characterized in that: The long tube bag (20) is provided with a plurality of sutures (23) in the radial direction, and the sutures (23) are used to separate the long tube bag (20) into a plurality of annular filling cavities (24).
4. The grouting pipe (100) for liquefying sandy soil foundation according to claim 1, characterized in that: The insertion head (12) has a cone shape with the tip facing downward.
5. The grouting pipe (100) for liquefying sand foundation according to claim 1, characterized in that: The upper end diameter of the insertion head (12) is larger than the outer diameter of the tube (11).
6. The grouting pipe (100) for liquefying sandy soil foundation according to claim 1, characterized in that: The number of the pulp outlets (111) is 3 to 6.
7. The grouting pipe (100) for liquefying sandy soil foundation according to claim 1, characterized in that: The pipe (11) is made of a metal pipe.
8. The grouting pipe (100) for liquefying sand foundation according to claim 1, characterized in that: The lower end of the long tube bag (20) is connected to the pipe (11) through a pipe clamp.
9. The grouting pipe (100) for liquefying sandy soil foundation according to claim 1 or 8, characterized in that: The upper end of the long tube bag (20) is connected to the lower end of the tube (11) through an elastic ring (1) whose inner diameter is smaller than the diameter of the tube (11).
10. The grouting pipe (100) for liquefying sandy soil foundation according to claim 9, characterized in that: The elastic ring (1) is a rubber ring.