Rapid grouting micro pile mounting device for steep cross slope soft soil roadbed

Abstract

The utility model discloses a grouting miniature pile rapid installation device for a steep cross slope soft soil roadbed, which relates to the roadbed design technology and comprises a rack, a bottom sealing plate is arranged on the rack, a clamping piece is arranged above the bottom sealing plate and comprises a limiting ring, and a plurality of fixing pieces are connected to the inner side of the limiting ring through threads. The bottom walls of the fixing pieces are fixedly connected with the top wall of the bottom sealing plate, the fixing pieces are obliquely fixed, a grouting pipe is arranged in the fixing piece, the input end of the grouting pipe communicates with a plurality of connecting pipes, and a plurality of grouting holes are formed in the side wall of the grouting pipe and are arranged in a spiral shape. A correcting assembly is further arranged on the rack and comprises an adjusting ring made of an elastic material, the adjusting ring is fixedly connected with the rack and is in sliding fit with the outer side wall of the grouting micro pile steel pipe, an adjusting cavity is formed in the adjusting ring, a plurality of cavities are formed in the side wall, away from the axis of the adjusting ring, of the adjusting cavity, and push rods are hinged to the side walls of the cavities; a gravity ball is further arranged in the adjusting cavity and used for reducing the deviation probability of the steel pipe in the construction process.

Description

Technical Field

[0001] This utility model relates to the field of roadbed design technology, and in particular to a rapid installation device for grouting micropiles for steep cross-slope soft soil roadbeds. Background Technology

[0002] Steep cross-slope soft soil subgrades are a common and complex geological condition in transportation engineering projects in mountainous and hilly areas. The steep slopes (often exceeding 30°) make it difficult for construction machinery to access the site, and traditional subgrade reinforcement techniques (such as dynamic compaction and replacement) are challenging to implement. Soft soils (such as silt and peat) have high natural water content and low shear strength, easily leading to subgrade slippage, settlement, and even collapse. With the advancement of the "Transportation Powerhouse" strategy, the scale of highway and railway construction in mountainous areas is expanding, creating an urgent need for foundation treatment technologies with high stability and low environmental disturbance.

[0003] In this context, grouting micropile technology has emerged, with core advantages including: flexible equipment operation, suitable for narrow and steep slope areas; pile lengths of up to 20-30m, penetrating soft soil layers to stable bearing strata; and the formation of a "pile-grout-soil" composite foundation through grouting, enhancing overall bearing capacity. Current grouting micropile installation processes mainly include: hole drilling, pile installation, and grouting reinforcement. The pile body of grouting micropiles is often made of steel pipe. However, in existing technologies, during the grouting reinforcement process, the steel pipe is prone to displacement under external forces, such as uneven grouting or slope disturbance, thus affecting the final mechanical properties of the grouting micropile. Utility Model Content

[0004] The purpose of this invention is to provide a rapid installation device for grouting micropiles for steep cross-slope soft soil subgrades, in order to solve the above-mentioned problems.

[0005] This utility model is achieved through the following technical solution:

[0006] A rapid installation device for grouting micropiles for soft soil subgrade with steep cross slopes includes a frame, a bottom sealing plate on the frame, a snap-fit ​​component above the bottom sealing plate, the snap-fit ​​component including a limiting ring, a plurality of fixing plates connected to the inner side of the limiting ring by threads, the bottom wall of the fixing plates being fixedly connected to the top wall of the bottom sealing plate, and the fixing plates being fixed at an angle, a grouting pipe being provided inside the fixing component, the input end of the grouting pipe being connected to a plurality of connecting pipes, and a plurality of grouting holes being opened on the side wall of the grouting pipe, the grouting holes being arranged in a spiral shape;

[0007] The frame is also equipped with a correction component, which includes an adjustment ring made of elastic material. The adjustment ring is fixedly connected to the frame and slides against the outer wall of the grouting micropile steel pipe. The adjustment ring has an adjustment cavity inside, and the adjustment cavity is annular. Several chambers are opened on the side wall of the adjustment cavity away from the axis of the adjustment ring. Push rods are hinged to the side walls of the chambers. A gravity ball is also provided inside the adjustment cavity.

[0008] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0009] 1. In this utility model, the design of the snap-fit ​​component allows the rotating ring to drive the deformation of the fixing plate, thereby clamping the steel pipe. Compared with the prior art, the axial position of the fixing plate does not change during the deformation process of the fixing plate in this solution. Therefore, the axis of the steel pipe can be adjusted during the clamping process, so that the axis is gradually adjusted to a vertical state. This is convenient and quick, and is less affected by the size of the steel pipe, and can meet the grouting needs of most grouting micro-piles.

[0010] 2. The design of the correction component in this utility model utilizes the design of a gravity ball and push rod. By adjusting the position of the gravity ball, it can determine whether the steel pipe is tilted. When the steel pipe is tilted, the angle of the steel pipe can be initially adjusted. At the same time, when the steel pipe is tilted, the adjusting ring will show a significant change during the push rod response process. That is, a significant gap will appear at the contact position between the adjusting ring and the steel pipe. By monitoring whether a gap appears at the contact position between the adjusting ring and the steel pipe, and the location of the gap, the operator can determine the angle and direction of the steel pipe tilt, and then make further adjustments to the steel pipe. Compared with the prior art, this solution can monitor the state of the steel pipe without surveying equipment, which helps to reduce the professional skills required of the operators during the grouting process.

[0011] 3. Compared with traditional grouting holes, the spiral arrangement of the grouting holes in this utility model can achieve simultaneous grouting in multiple directions and at multiple heights. This helps to reduce the accumulation of cement mortar and other materials in the pile hole during the grouting process, or the blind spots in the pile hole, and helps to improve the uniformity of grouting. At the same time, due to the design of multiple grouting holes, the pressure around the grouting holes can be effectively reduced, and the service life of the device can be extended.

[0012] Furthermore, the frame is also equipped with a centering frame, which includes several screws. The screws are evenly arranged around the axis of the limiting ring, and the screws are detachably connected to the frame.

[0013] Beneficial effects: The design of the central frame in this solution uses evenly distributed screws to fix the position of the steel pipe. When the steel pipe deviates, the screws will provide resistance to prevent further deviation. Compared with existing technologies, this solution can help operators limit the position and angle of the steel pipe, reducing the workload of operators during the grouting process.

[0014] Furthermore, a baffle is fixedly connected to the end of the screw near the center of the limiting ring.

[0015] Beneficial effects: Compared with existing technologies, the design of the baffle can increase the contact area between the screw and the steel pipe, thereby reducing the pressure applied by the screw to the steel pipe, reducing the probability of the screw causing damage to the surface of the steel pipe, and avoiding changes in the mechanical properties of the steel pipe.

[0016] Furthermore, all the baffles are curved.

[0017] Beneficial effects: Compared with existing technologies, the arc-shaped baffle can fit better with the steel pipe, thereby increasing the contact area between the baffle and the steel pipe. At the same time, compared with square or other shaped baffles, the arc-shaped baffle is less prone to stress concentration, thus reducing the probability of steel pipe damage during construction.

[0018] Furthermore, each chamber has an opening on its side wall near the gravity sphere, and each opening has a baffle hinged to its side wall.

[0019] Beneficial effects: Compared with existing technologies, this solution effectively avoids repeated compression of the chamber sidewall by the gravity ball, which would cause elastic fatigue of the chamber sidewall and affect the service life of the device, through the design of the opening and baffle.

[0020] Furthermore, a first torsion spring is fitted at the hinge joint between the push rod and the chamber.

[0021] Beneficial effects: Compared with the existing technology, the design of the first torsion spring in this solution can drive the push rod to reset at the same time as the gravity ball triggers the push rod to rotate and reset, reducing the degree of manual intervention in the device reset process, thereby reducing the number of operation steps for operators.

[0022] Furthermore, the fixing plates are evenly arranged along the axis of the limiting ring.

[0023] Beneficial effects: Compared with other arrangement schemes, the scheme of uniformly arranging the fixing plates along the axis of the limiting ring ensures that the force applied to the steel pipe by the fixing plates is evenly distributed along the radial direction of the steel pipe, effectively avoiding the deformation of the steel pipe caused by uneven radial force distribution, which would affect the mechanical properties of the grouting micropile.

[0024] Furthermore, the axis of the regulating cavity is arranged to coincide with the axis of the regulating ring.

[0025] Beneficial effects: Compared with existing technologies, this solution can ensure that the self-weight of each position on the edge of the adjusting ring is similar in the initial state, thereby avoiding the adjustment ring from tilting under its own weight in the initial state, which would affect the operator's judgment.

[0026] Furthermore, a ground bracket is fixedly connected to the bottom wall of the sealing plate.

[0027] Beneficial effects: The design of the ground support frame in this solution distributes the load of the device to the ground, reducing the problem of device tilting caused by uneven ground settlement, thereby improving the stability of the device during use.

[0028] Furthermore, a second torsion spring is provided at the hinge joint between the baffle and the sidewall of the opening.

[0029] Beneficial effects: Compared with the solution without the second torsion spring, this solution can help the baffle return to its original position after the gravity ball leaves the chamber. At the same time, the second torsion spring can also provide resistance to the rotation of the baffle through its own elasticity, reducing the impact of vibration and other factors on the baffle, which can cause it to shake and thus cause the device push rod to push the steel pipe, resulting in the steel pipe tilting and operator misjudgment. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of this utility model;

[0032] Figure 2 Top view of the correction component;

[0033] Figure 3 for Figure 2 Cross-sectional view along the AA direction.

[0034] The reference numerals in the attached drawings represent: 1. bottom plate; 11. ground support; 12. frame; 2. grouting pipe; 21. grouting hole; 22. connecting pipe; 3. fixing plate; 31. limiting ring; 4. screw; 41. baffle; 5. adjusting ring; 51. adjusting cavity; 52. baffle; 53. chamber; 54. gravity ball; 55. push rod. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are for explaining the utility model only and are not intended to limit the utility model. It should be noted that this utility model is already in the actual research and development stage.

[0036] Example 1

[0037] like Figures 1 to 3As shown, this embodiment includes a frame 12, with a bottom plate 1 below the frame 12. The bottom plate 1 is preferably made of stainless steel. A snap-fit ​​component is provided above the bottom plate 1. The snap-fit ​​component includes a limiting ring 31. Several fixing pieces 3 are connected to the inner side of the limiting ring 31 by threads. The fixing pieces 3 are evenly arranged along the axis of the limiting ring 31. The bottom wall of the fixing pieces 3 is welded and fixed to the top wall of the bottom plate 1. The fixing pieces 3 are all fixed at an angle. The distance between the top of the fixing piece 3 and the axis of the limiting ring 31 is less than the distance between the bottom of the fixing piece 3 and the axis of the limiting ring 31. A grouting pipe 2 is provided inside the fixing component. Several connecting pipes 22 are connected to the input end of the grouting pipe 2. Several grouting holes 21 are opened on the side wall of the grouting pipe 2. The grouting holes 21 are arranged in a spiral shape.

[0038] The frame 12 is also equipped with a correction component, which includes an adjustment ring 5 made of elastic material. The outer wall of the adjustment ring 5 is bonded and fixed to the frame 12. The adjustment ring 5 slides with the outer wall of the grouting micropile steel pipe. An adjustment cavity 51 is opened inside the adjustment ring 5. The adjustment cavity 51 is annular. Several chambers 53 are opened on the side wall of the adjustment cavity 51 away from the axis of the adjustment ring 5. Push rods 55 are hinged to the side walls of the chambers 53. A gravity ball 54 is also provided inside the adjustment cavity 51. An opening is opened on the side wall of the chambers 53 near the gravity ball 54. A baffle 52 is hinged to the side wall of the opening. A first torsion spring is sleeved at the hinge point between the push rod 55 and the chamber 53.

[0039] Detailed implementation method: When using this device, the bottom plate 1 is placed above the completed pile hole, and the axis of the limiting ring 31 is aligned with the axis of the pile hole. Then, the steel pipe required for the grouting pile is inserted into the pile hole, and the steel pipe is passed through the bottom plate 1, the adjusting ring, and the limiting ring 31. At the same time, since the adjusting ring 5 is made of elastic material, after passing through the adjusting ring 5, the adjusting ring 5 can be reset under its own elastic force, thus clamping the steel pipe to a certain extent. Then, the limiting ring 31 is rotated. During the movement of the limiting ring 31, the fixing plate 3 is deformed, and one side of the fixing plate 3 gradually moves closer to the axis of the limiting ring 31, thus completing the clamping of the steel pipe.

[0040] During use, after the grouting pipe 2 is placed into the steel pipe, a connecting pipe 22 of appropriate strength and size is selected according to the grouting process requirements and specific construction steps (such as ordinary grouting or split grouting). The corresponding connecting pipe 22 and the grouting pipe 2 are connected, and then grout is injected into the pile hole through the connecting pipe 22.

[0041] During the grouting process, changes in the mechanical properties of the soil around the pile hole or the kinetic energy transferred from the cement mortar to the steel pipe can cause the steel pipe to tilt, thus affecting the mechanical properties of the subsequent grouting micropiles.

[0042] When the steel pipe tilts, it drives the adjusting ring 5 to move synchronously. At this time, the adjusting cavity 51 tilts, and the gravity ball 54 inside the adjusting ring 5 moves under the action of gravity, gradually reaching the lowest point of the adjusting cavity 51. Under its own gravity, it pushes the baffle 52 and enters the cavity 53. Then it squeezes the lower end of the push rod 55, causing the push rod 55 to rotate. The upper end of the push rod 55 pushes the side wall of the cavity 53 to deform, thereby pushing the steel pipe to help it return to the neutral position.

[0043] During the grouting process, the operator continuously grouts the positional relationship between the inner wall of the adjusting ring 5 and the steel pipe. When a certain gap exists between the two, the adjusting ring 5 tilts. At this time, the operator can adjust the position of the steel pipe and the adjusting ring 5 according to the gap position, so that the adjusting ring 5 returns to the horizontal position. As can be seen from the above steps, in the implementation of this scheme, the adjusting cavity 51 can not only realize the initial adjustment of the steel pipe, but also assist the operator in judging the state of the steel pipe. Moreover, the operation does not require the use of surveying equipment, reducing the professional skills required of the operator for the grouting operation. It also makes it easy for the operator to reset the adjusting ring 5, which is convenient for subsequent use.

[0044] Simultaneously, during the reset process of the adjusting ring 5, as the gravity ball 54 leaves the chamber 53, the first torsion spring resets, driving the baffle 52 to reset as well. The design of the first torsion spring provides resistance when the gravity ball 54 enters the chamber 53, thereby reducing the sensitivity of the device's response. This filters out inclinations that have a relatively small impact on the mechanical properties of the grouting micropiles, preventing frequent responses from affecting the normal grouting process.

[0045] Example 2

[0046] The difference from the above embodiment is that the frame 12 is also provided with a centering frame, which includes a plurality of screws 4. The screws 4 are evenly arranged around the axis of the limiting ring 31, and the screws 4 are detachably connected to the frame 12 by threads. A baffle 41 is welded and fixed to one end of the screws 4 near the axis of the limiting ring 31. The baffles 41 are all arc-shaped.

[0047] Detailed implementation method: When using this solution, after fixing the steel pipe by means of the limiting ring 31 and the adjusting ring 5, the screw 4 is rotated so that the screw 4 drives the baffle 41 to move toward the steel pipe until the baffle 41 contacts the surface of the steel pipe.

[0048] During the grouting process, the design of the central frame can provide certain resistance to the steel pipe during the displacement process, so as to prevent the steel pipe from tilting or displacing further, thereby reducing the probability of significant tilting of the steel pipe during the grouting process, and thus reducing the number of operation steps for operators. At the same time, the design of the baffle plate 41 in this scheme increases the contact area between the screw 4 and the steel pipe, thereby reducing the pressure applied to the steel pipe by the screw 4, reducing the excessive pressure applied to the steel pipe by the screw 4, which could cause deformation of the steel pipe and thus affect the mechanical properties of the subsequent grouting micropiles.

[0049] The arc-shaped baffle 41 in this solution can fit the arc-shaped outer wall of the steel pipe better than other solutions, thereby further reducing the pressure applied to the steel pipe, protecting the steel pipe and preventing deformation during construction.

[0050] Example 3

[0051] The difference from the above embodiment is that the fixing piece 3 is evenly arranged along the axis of the limiting ring 31.

[0052] In this embodiment, the axis of the adjusting cavity 51 is arranged to coincide with the axis of the adjusting ring 5.

[0053] In this embodiment, a ground bracket 11 is fixedly connected to the bottom wall of the bottom plate 1.

[0054] In this embodiment, a second torsion spring is provided at the hinge joint between the baffle 52 and the opening sidewall.

[0055] The specific implementation process is as follows: In this scheme, the uniformly arranged fixing plate 3, compared with other schemes, has a force applied to the steel pipe during deformation that is evenly distributed along the radial direction of the steel pipe, thereby avoiding stress concentration at a certain position, causing the steel pipe to tilt or deform, and affecting the mechanical properties of the final grouting micropile.

[0056] In this design, the axis of the adjusting cavity 51 coincides with that of the adjusting ring 5. Compared with the eccentric design, the density of the adjusting ring 5 is similar at all positions. It is less likely to deform under its own gravity due to uneven weight distribution, thus affecting the operator's judgment on whether the steel pipe is tilted.

[0057] The design of the ground bracket 11 in this scheme transfers the load of the device downwards, enhances the stability of the device installation position, reduces the tilting of the device caused by uneven ground settlement, and thus reduces the negative impact on the steel pipe.

[0058] The design of the second torsion spring in this scheme provides resistance to the rotation of the baffle 52 through its own elasticity, reducing the impact of vibration and other factors on the baffle 52, thus preventing swaying and subsequent tilting of the steel pipe by the push rod 55, which could lead to operator misjudgment. Furthermore, compared to schemes using damping hinges, this scheme allows for automatic return to its original position after being subjected to the gravity ball 54, minimizing interference with the operator's judgment of whether the adjusting ring 5 is horizontal.

[0059] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A rapid installation device for grouting micropiles in soft soil subgrade with steep cross slopes, comprising a frame (12) and a bottom sealing plate (1) on the frame (12), characterized in that: A snap-fit ​​component is provided above the bottom plate (1). The snap-fit ​​component includes a limiting ring (31). Several fixing pieces (3) are connected to the inner side of the limiting ring (31) by threads. The bottom wall of the fixing pieces (3) is fixedly connected to the top wall of the bottom plate (1). The fixing pieces (3) are all arranged at an angle to the horizontal plane. A grouting pipe (2) is provided inside the fixing component. Several connecting pipes (22) are connected to the input end of the grouting pipe (2). Several grouting holes (21) are opened on the side wall of the grouting pipe (2). The grouting holes (21) are arranged in a spiral shape. The frame (12) is also provided with a correction component, which includes an adjustment ring (5) of elastic material. The adjustment ring (5) is fixedly connected to the frame (12). The adjustment ring (5) slides with the outer wall of the steel pipe of the grouting micro pile. An adjustment cavity (51) is opened in the adjustment ring (5). The adjustment cavity (51) is annular. Several chambers (53) are opened on the side wall of the adjustment cavity (51) away from the axis of the adjustment ring (5). Push rods (55) are hinged to the side walls of the chambers (53). A gravity ball (54) is also provided in the adjustment cavity (51).

2. The rapid installation device for grouting micropiles for steep cross-slope soft soil subgrade according to claim 1, characterized in that: The frame (12) is also provided with a centering frame, which includes several screws (4). The screws (4) are evenly arranged around the axis of the limiting ring (31), and the screws (4) are detachably connected to the frame (12).

3. The rapid installation device for grouting micropiles for steep cross-slope soft soil subgrade according to claim 1, characterized in that: A baffle plate (41) is fixedly connected to one end of the screw (4) near the axis of the limiting ring (31).

4. The rapid installation device for grouting micropiles for steep transverse slope soft soil subgrade according to claim 1, characterized in that: All baffles (41) are arc-shaped.

5. The rapid installation device for grouting micropiles for steep transverse slope soft soil subgrade according to claim 1, characterized in that: The chamber (53) has an opening on the side wall near the gravity ball (54), and a baffle (52) is hinged to the side wall of the opening.

6. The rapid installation device for grouting micropiles for steep cross-slope soft soil subgrade according to claim 1, characterized in that: A first torsion spring is fitted at the hinge of the push rod (55) and the chamber (53).

7. The rapid installation device for grouting micropiles for steep transverse slope soft soil subgrade according to claim 1, characterized in that: The fixing pieces (3) are evenly arranged along the axis of the limiting ring (31).

8. The rapid installation device for grouting micropiles for steep cross-slope soft soil subgrade according to claim 1, characterized in that: The axis of the regulating cavity (51) is arranged to coincide with the axis of the regulating ring (5).

9. A rapid installation device for grouting micropiles for steep transverse slope soft soil subgrade according to claim 1, characterized in that: The bottom wall of the sealing plate (1) is fixedly connected to a ground bracket (11).

10. A rapid installation device for grouting micropiles for steep transverse slope soft soil subgrade according to claim 1, characterized in that: A second torsion spring is provided at the hinge point between the baffle (52) and the side wall of the opening.

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