Roadbed grouting reinforcement structure

Abstract

The utility model relates to a roadbed grouting reinforcement structure, which effectively solves the problem of poor sealing reliability of a roadbed grouting orifice. According to the technical scheme, the grouting device comprises a grouting pipe, the grouting pipe is slidably sleeved with a first sealing ring, the first sealing ring is of a two-section step type, the diameter of the upper section is large, the diameter of the lower section is small, an upper pressing plate is arranged at the upper end of the first sealing ring, a lower pressing plate is arranged at the lower end of the first sealing ring, and a screw penetrating through the upper pressing plate, the first sealing ring and the lower pressing plate is further arranged; a nut is screwed at the upper end of the screw; a hydraulic cylinder is installed between the first sealing ring and the grouting pipe, a plurality of radial nail thorns are evenly distributed on the circumference of the side wall of the hydraulic cylinder, the nail thorns penetrate through the cylinder wall of the hydraulic cylinder and outwards penetrate through the first sealing ring, a piston is fixed to the lower end of the upper pressing plate, and the lower end of the piston is inserted into an oil cavity of the hydraulic cylinder. According to the sealing device, the sealing effect can be improved, and the first sealing ring cannot be jacked open by grouting pressure, so that the opening of the grouting hole can be effectively sealed all the time.

Description

Technical Field

[0001] The utility model relates to the field of subgrade construction, and specifically relates to a subgrade grouting reinforcement structure. Background Technique

[0002] After the subgrade has been in use for a long time, due to natural geological settlement and vehicle rolling, depressions and cracks will appear. At this time, a subgrade grouting reinforcement structure is needed to assist in repair and reinforcement; the utility model patent with the application number: CN202122970813.1 discloses a subgrade grouting reinforcement structure. After the installation cylinder is inserted into the grouting hole, a rubber ring sleeved on the installation cylinder is pressed against the orifice of the grouting hole, and a compression spring is used to provide a downward pressure to seal the grouting hole. This sealing method is single. If the orifice of the grouting hole is uneven, there is a risk of poor sealing. Moreover, under the action of the grouting pressure, the rubber ring may be pushed upward against the action of the compression spring, resulting in sealing failure. In addition, as the installation cylinder is lifted, the pressure of the compression spring becomes smaller and smaller, and the sealing reliability becomes worse. If the compression spring is required to always maintain an effective pressure during the entire lifting stroke of the installation cylinder, the compression spring needs to have a large compressible amount, that is, a long compression spring is required, and it is difficult to ensure the stiffness of the compression spring. Summary of the Invention

[0003] The utility model provides a subgrade grouting reinforcement structure, which effectively solves the problem of poor sealing reliability of the subgrade grouting orifice.

[0004] The technical solution it adopts includes a grouting pipe. A first sealing ring is slidably sleeved on the grouting pipe. The first sealing ring is of a two-stage stepped type with a larger diameter in the upper section and a smaller diameter in the lower section. An upper pressing plate is provided at the upper end of the first sealing ring, and a lower pressing plate is provided at the lower end. A screw rod passing through the upper pressing plate, the first sealing ring and the lower pressing plate is also provided. A nut is screwed at the upper end of the screw rod; a hydraulic cylinder is installed between the first sealing ring and the grouting pipe. The oil cavity of the hydraulic cylinder is annular. A number of radial nail thorns are evenly distributed in the circumferential direction on the side wall of the hydraulic cylinder. The nail thorns penetrate through the cylinder wall of the hydraulic cylinder and pierce the first sealing ring outward. A ring-shaped piston is fixed at the lower end of the upper pressing plate, and the lower end of the piston is inserted into the oil cavity of the hydraulic cylinder.

[0005] The upper end of the hydraulic cylinder is lower than the upper end of the first sealing ring, and the lower end of the hydraulic cylinder is higher than the lower end of the first sealing ring. The part of the first sealing ring below the hydraulic cylinder is in direct contact with the outer wall of the grouting pipe.

[0006] A second sealing ring is installed at the joint between the nail thorn and the hydraulic cylinder.

[0007] The lower end of the grouting pipe is closed, and a number of discharge grooves are evenly distributed in the circumferential direction on the side wall of the lower end of the grouting pipe.

[0008] A limiting edge is provided at the inner end of the nail thorn.

[0009] The utility model can improve the sealing effect, and the first sealing ring will not be pushed open by the grouting pressure, nor will it move upward with the lifting of the grouting pipe, so that the orifice of the grouting hole can always be effectively sealed. Description of the Drawings

[0010] Figure 1 It is a front view sectional view of the initial state of the utility model.

[0011] Figure 2 It is a front view sectional view of the sealed state of the utility model.

[0012] Figure 3 is Figure 1 an enlarged view of position A in Detailed Description of the Invention

[0013] Combined with the drawings, the utility model includes a grouting pipe 1, on which a first sealing ring 2 is slidably sleeved. The first sealing ring 2 is of a two-stage stepped type with a larger diameter in the upper section and a smaller diameter in the lower section. After the grouting pipe 1 is inserted into the grouting hole, the first sealing ring 2 is located at the orifice of the grouting hole. The upper section of the first sealing ring 2 presses on the orifice of the grouting hole, and the lower section is inserted into the grouting hole. An upper pressing plate 3 is provided at the upper end of the first sealing ring 2, and a lower pressing plate 4 is provided at the lower end. A screw rod 5 passing through the upper pressing plate 3, the first sealing ring 2 and the lower pressing plate 4 is also provided. A nut 6 is screwed on the upper end of the screw rod 5. When the nut 6 is tightened, the upper pressing plate 3 and the lower pressing plate 4 will squeeze the first sealing ring 2 towards the middle, so that the upper section of the first sealing ring 2 is tightly pressed on the upper end of the grouting hole. At the same time, the first sealing ring 2 expands radially, and the outer wall of the lower end presses tightly against the inner wall of the grouting hole; A hydraulic cylinder 7 is installed between the first sealing ring 2 and the grouting pipe 1. The oil cavity of the hydraulic cylinder 7 is annular. A number of radial nail spurs 8 are evenly distributed on the side wall of the hydraulic cylinder 7 in the circumferential direction. The nail spurs 8 penetrate through the cylinder wall of the hydraulic cylinder 7 and pierce the first sealing ring 2 outward. A ring-shaped piston 9 is fixed at the lower end of the upper pressing plate 3. The lower end of the piston 9 is inserted into the oil cavity of the hydraulic cylinder 7. When the upper pressing plate 3 is pressed down, the piston 9 moves down synchronously, and the oil pressure will push the nail spurs 8 outwards, so that the nail spurs 8 are inserted into the side wall of the grouting hole for axial positioning.

[0014] The upper end of the hydraulic cylinder 7 is lower than the upper end of the first sealing ring 2, and the lower end of the hydraulic cylinder 7 is higher than the lower end of the first sealing ring 2, so as to avoid the hydraulic cylinder 7 affecting the axial compression of the first sealing ring 2. The part of the first sealing ring 2 located below the hydraulic cylinder 7 is in direct contact with the outer wall of the grouting pipe 1 to avoid slurry leakage here.

[0015] A second sealing ring 10 is installed at the joint of the nail spur 8 and the hydraulic cylinder 7 to avoid oil leakage here.

[0016] The lower end of the grouting pipe 1 is closed, and a number of discharge grooves 11 are evenly distributed on the circumferential side wall of the lower end of the grouting pipe 1, which can filter large pieces of materials in the slurry.

[0017] The inner end of the nail spike 8 is provided with a limiting edge 12 to prevent the nail spike 8 from coming out.

[0018] When the utility model is in use, the grouting pipe 1 is inserted into the drilled grouting hole, the first sealing ring 2 is slid downwards so that the upper section contacts the orifice of the grouting hole, and the lower section is inserted into the orifice of the grouting hole. Then, the nuts 6 on each screw rod 5 are gradually tightened. The nut 6 drives the upper pressing plate 3 and the lower pressing plate 4 to move towards the middle. The upper pressing plate 3 pushes the piston 9 into the hydraulic cylinder 7, and the hydraulic pressure pushes the nail spike 8 outwards. The nail spike 8 pierces into the side wall of the grouting hole to axially position the first sealing ring 2. When the upper pressing plate 3 continues to press downwards, it will axially press the first sealing ring 2, so that the upper section of the first sealing ring 2 is tightly pressed against the orifice of the grouting hole. At the same time, the first sealing ring 2 expands radially, the side wall of the lower section of the first sealing ring 2 is tightly pressed against the inner wall of the grouting hole, and the inner wall of the lower section of the first sealing ring 2 is tightly pressed against the outer wall of the grouting pipe 1, thereby sealing the orifice of the grouting hole.

[0019] The first sealing ring 2 of the utility model can form two-end seals at the upper end and the inner wall of the orifice of the grouting hole, improving the sealing effect. Moreover, through the nail spike 8 piercing into the inner wall of the grouting hole for axial positioning, the first sealing ring 2 will not be pushed open by the grouting pressure, nor will it move upwards as the grouting pipe 1 is lifted, so that the orifice of the grouting hole can always be effectively sealed.

Claims

1. A roadbed grouting reinforcement structure, comprising a grouting pipe (1), characterized in that: A first sealing ring (2) is provided on the upper sliding sleeve of the grouting pipe (1). The first sealing ring (2) is a two-stage stepped type with an upper stage having a larger diameter and a lower stage having a smaller diameter. An upper pressure plate (3) is provided at the upper end of the first sealing ring (2), and a lower pressure plate (4) is provided at the lower end. A screw (5) is also provided which penetrates the upper pressure plate (3), the first sealing ring (2) and the lower pressure plate (4). A nut (6) is screwed onto the upper end of the screw (5). A hydraulic cylinder (7) is installed between the first sealing ring (2) and the grouting pipe (1). The oil chamber of the hydraulic cylinder (7) is annular. A plurality of radial spikes (8) are evenly distributed on the circumference of the side wall of the hydraulic cylinder (7). The spikes (8) penetrate the cylinder wall of the hydraulic cylinder (7) and pierce the first sealing ring (2) outwardly. An annular piston (9) is fixed at the lower end of the upper pressure plate (3). The lower end of the piston (9) is inserted into the oil chamber of the hydraulic cylinder (7).

2. A roadbed grouting reinforcement structure according to claim 1, characterized in that: The upper end of the hydraulic cylinder (7) is lower than the upper end of the first sealing ring (2), the lower end of the hydraulic cylinder (7) is higher than the lower end of the first sealing ring (2), and the portion of the first sealing ring (2) located below the hydraulic cylinder (7) directly contacts the outer wall of the grouting pipe (1).

3. A roadbed grouting reinforcement structure according to claim 1, characterized in that: A second sealing ring (10) is installed at the joint between the spike (8) and the hydraulic cylinder (7).

4. A roadbed grouting reinforcement structure according to claim 1, characterized in that: The lower end of the grouting pipe (1) is closed, and a plurality of discharge grooves (11) are evenly distributed on the circumference of the side wall of the lower end of the grouting pipe (1).

5. A roadbed grouting reinforcement structure according to claim 1, characterized in that: The inner end of the spike (8) is provided with a limiting edge (12).

Images