Road grouting hole structure

Abstract

The utility model aims to provide a road grouting hole structure, an opening unit comprises a first opening and a second opening which are arranged in parallel, and further comprises a third opening, and the third opening respectively penetrates through the first opening and the second opening along the inclined direction and is communicated with a cavity. The utility model relates to the technical field of road construction, which adopts the design of a first opening and a second opening which are parallel to each other during opening, and a third opening which is communicated with the first opening and the second opening is obliquely formed on one side to form an opening unit. According to the hole opening unit, gas can be discharged through the second hole in one side during grouting of the hole below the hole opening unit, it is ensured that the gas in the hole can be continuously and effectively discharged in the grouting process, the gas blocking phenomenon is avoided, and the periphery and the bottom of the hole and dead angle areas where the first hole is difficult to directly touch can be effectively filled.

Description

Technical Field

[0001] This utility model relates to the field of road construction technology, specifically to a road grouting hole structure. Background Technology

[0002] Beneath many city roads, highways, and municipal roads, damaged water supply and drainage pipes can lead to leakage of liquids (including clean water and sewage). Natural precipitation, such as rainwater and snowmelt, can also seep downwards through road surface cracks, areas with poor drainage systems, or the soil's inherent permeability. As leaking water or infiltrated rainwater flows underground, it continuously erodes and transports soil particles, carrying away fine particles and gradually creating cavities. To ensure road safety and normal use, regular inspections and repairs are necessary beneath the roads. The most commonly used repair technique in the industry is grouting reinforcement. Under pressure, grout fills the cavities and penetrates into the soil pores. After solidification, it forms a solidified body with a certain strength, thereby restoring or improving the soil's bearing capacity and supporting the road structure above.

[0003] Underground cavities are not uniformly distributed; they may consist of multiple independent cavities of varying sizes. When using equidistant openings, if the horizontal projected area of ​​a larger cavity happens to cover only the location of one grouting hole (i.e., "only one opening in a cavity"), the grout enters through that hole, and the gas can only attempt to escape from the same hole or a very small area around it, failing to truly fill the entire cavity, resulting in "incomplete grouting," and the cavity still exists. It is also possible that the road surface bulges, deforms, or even cracks near the grouting hole, forming a "road surface protrusion" phenomenon. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a road grouting hole structure that solves the problem of inability to smoothly inject grout when only one opening is made in existing underground cavities.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a road grouting hole structure, including a road base layer and a cavity located below the road base layer, and further including an opening unit that communicates downward along the surface of the road base layer and the cavity. The opening unit includes a first opening and a second opening arranged in parallel, and also includes a third opening. The third opening penetrates the first opening and the second opening respectively along an inclined direction and communicates with the cavity.

[0006] Preferably, the first opening and the second opening are arranged perpendicularly and are parallel to each other.

[0007] Preferably, the distance between the first opening and the second opening is A, wherein 20cm < A < 30cm.

[0008] Preferably, the included angle between the third opening and the first and second openings is α, where 25° < α < 45°.

[0009] Preferably, the perforation unit further includes a first countersunk hole and a second countersunk hole formed on the surface of the roadbed, wherein the first perforation is located in the first countersunk hole, and the second and third perforations are located in the second countersunk hole.

[0010] Preferably, a grouting sealing device is provided in the first and second openings, and a retainer is provided at the top of the grouting sealing device, the retainer being located in the first and second countersunk holes.

[0011] Preferably, the top of the retainer is flipped outward to form a side pressure plate, which is pressed against the road base surface circumferentially above the top of the first and second countersunk holes.

[0012] Preferably, the bottom of the retainer is sealed with a bottom pressure plate, which presses against the bottom surfaces of the first countersunk hole and the second countersunk hole;

[0013] The bottom pressure plate is provided with a guide tube for the grouting sealing device to pass through, and the guide tube is coaxial with the first opening and the second opening.

[0014] Preferably, a partition is provided in the middle of the retainer, and an opening coaxial with the guide tube is provided on the partition. The circumferential groove of the opening is formed into fins at the partition.

[0015] Preferably, the end of the fin is bent downward to form a curved portion, which abuts against the outer wall of the grouting sealing device.

[0016] Beneficial effects

[0017] By using the road grouting hole structure provided by this utility model, a first and second opening are designed in parallel when opening the hole, and a third opening that communicates with the first and second openings is opened obliquely on one side to form an opening unit. This allows the gas in the cavity below the opening unit to be discharged through the second opening on one side during grouting, ensuring that the gas in the cavity can be continuously and effectively discharged during the grouting process, and avoiding the occurrence of air blockage.

[0018] As the cavity is gradually filled with grout, the grout level will begin to rise in the first opening until it reaches the junction of the third and first openings. At this point, the grout flows obliquely along the third opening and enters the second opening below the junction, injecting into the gaps around the cavity. This allows the gas around the cavity to enter along the bottom of the third opening, enter the second opening above the junction, and then be discharged. This effectively fills the periphery and bottom of the cavity, as well as the dead corner areas that are difficult to reach directly by the first opening. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the grouting hole structure in existing technology for roads;

[0020] Figure 2 This is a schematic diagram of the road grouting hole structure of this utility model;

[0021] Figure 3 This is a schematic diagram showing the distribution of the perforated unit of this utility model on the surface of the road base layer;

[0022] Figure 4 This is a schematic diagram of the opening unit structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the grouting sealing device of this utility model inserted into the opening unit;

[0024] Figure 6 This is a schematic diagram of the first configuration of the cage of this utility model;

[0025] Figure 7 This utility model Figure 6 Top view;

[0026] Figure 8 This is a schematic diagram of the second configuration of the cage in this utility model;

[0027] Figure 9 This utility model Figure 8 Top view.

[0028] Explanation of symbols in the diagram

[0029] 1. Road base course, 2. Cavity, 3. Opening unit, 31. First opening, 32. Second opening, 33. Third opening, 4. First countersunk hole, 5. Second countersunk hole, 6. Retainer, 7. Grouting sealing device, 8. Side pressure plate, 9. Bottom pressure plate, 10. Fin, 11. Bend, 12. Guide tube, 13. Partition. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Various changes can be made to the implementation scheme as long as the effects of the present invention can be achieved.

[0031] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0032] Reference Figure 2-9 The grouting hole structure of this implementation plan is described. For example... Figure 2As shown, the road grouting hole structure in this embodiment includes cavities 2 located below the road base 1, with each cavity 2 consisting of multiple cavities of varying sizes. It also includes opening units 3 extending downwards along the surface of the road base 1 and connecting to the cavities 2, used to inject grout into the cavities 2 to fill them and compact it into the original road base structure, thus achieving the purpose of base reinforcement. The grout is a cement grouting slurry, composed of cement, an expanding agent, an early-strength water-reducing agent, and water, with a ratio of 1:0.028:0.008:0.56. After solidification, the grouting slurry must exhibit micro-expansion properties and a certain degree of fluidity. Using an inverted cone-shaped flowability tester, its flowability should be between 15-30 seconds, and the 3-day compressive strength of the grouting slurry should not be less than 3.5 MPa.

[0033] To ensure effective air venting during grouting, the opening unit 3 in this embodiment is drilled using a diamond drilling rig, such as... Figure 4 The diagram shows a first opening 31 and a second opening 32 arranged side-by-side, with a distance A between them, where 20cm < A < 30cm; preferably, the distance A is 25cm. The diameter of the first opening 31 and the second opening 32 is 51mm, and the treatment depth is 0.6-0.7m. It should be noted that this depth penetrates through a stable base layer. The first opening 31 and the second opening 32 are vertically aligned and parallel to each other. After drilling, any remaining debris in the holes is cleaned to facilitate the smooth flow of grout into the cavity 2 under pressure pump operation.

[0034] The opening unit in this embodiment also includes a third opening 33, which penetrates the first opening 31 and the second opening 32 along the inclined direction and connects to the cavity 2. The included angle between the third opening 33 and the first opening 31 and the second opening 32 is α, where 25° < α < 45°.

[0035] During grouting, the pressure control personnel start the grouting pump, adjust the pressure of the hydraulic pump station, and monitor the grouting pump pressure. Once the grouting pump pressure reaches the designed pressure, the hydraulic pump station pressure is no longer adjusted, and grouting is performed under stable pressure. The grout flows downwards along the first opening 31 into the cavity 2 below. At this time, the gas in the cavity 2 is discharged through the second opening 32 or through an adjacent opening unit. When the cavity 2 is full, the grout first rises in the first opening 31 until it reaches the intersection of the third opening 33 and the first opening 31. At this time, the grout flows obliquely along the third opening 33 and enters the second opening 32 below the intersection, injecting into the gaps around the cavity 2. This allows the gas around the cavity 2 to enter along the bottom of the third opening 33, enter the second opening 32 above the intersection, and then be discharged. Grouting is immediately stopped when grout overflows from the second opening 32 or an adjacent opening unit, or when the road surface rises. At this point, the grouting work is complete.

[0036] In addition, in this embodiment, the opening unit 3 also includes a first countersunk hole 4 and a second countersunk hole 5 opened on the surface of the roadbed 1. The first opening 31 is located in the first countersunk hole 4, and the second opening 32 and the third opening 33 are located in the second countersunk hole 5.

[0037] Furthermore, such as Figure 5 As shown, grouting sealers 7 are installed in the first opening 31 and the second opening 32. After grouting is completed, the grouting sealers are used to plug the first opening 31 and the second opening 32, and a thorough check is performed to ensure there is no grout leakage. A retainer 6 is installed at the top of the grouting sealer 7, and the retainer 6 is located inside the first countersunk hole 4 and the second countersunk hole 5. After the grout has solidified, the grouting sealer is removed. The retainer 6 is used to press against the openings of the first opening 31 and the second opening 32 when the grouting sealer 7 is removed, preventing the asphalt or stones at the openings from being lifted and causing defects in the road surface. Furthermore, because the retainer 6 is located inside the first countersunk hole 4 and the second countersunk hole 5, it ensures stable placement and prevents accidental collisions that could cause the grouting sealer 7 to tilt.

[0038] In this embodiment, the retainer 6 is an annular component that can be embedded into the first countersunk hole 4 or the second countersunk hole 5. Its top is flipped outwards to form a side pressure plate 8, which presses against the circumferential surface of the roadbed 1 at the top of the first and second countersunk holes 4 and 5, thus pressing against the road surface circumferentially around the opening. A bottom pressure plate 9 is sealed at the bottom of the retainer 6, pressing against the bottom surface of the first and second countersunk holes 4 and 5, thus pressing against the road surface circumferentially around the bottom surface of the first and second countersunk holes 4 and 5. When removing the grouting sealer 7, the operator's feet rest on the side pressure plate 8.

[0039] Furthermore, the bottom pressure plate 9 is provided with a guide tube 12 for the grouting sealing device 7 to pass through. The guide tube 12 is coaxial with the first opening 31 and the second opening 32, so that the grouting sealing device 7 can be inserted into the first opening 31 and the second opening 32 after passing through the guide tube 12.

[0040] Meanwhile, in this embodiment, a partition 13 is provided in the middle of the retainer 6. An opening coaxial with the guide tube 12 is formed on the partition 13, and a fin 10 is formed by a groove in the circumferential direction of the opening. The end of the fin 10 is bent downwards to form a curved portion 11, which abuts against the outer wall of the grouting sealer 7. It should be explained in detail that since the first countersunk hole 4 only has a first opening 31, and the second countersunk hole 5 has a second opening 32 and a third opening 33, only the grouting sealer 7 needs to be inserted into the second opening 32. Therefore, the retainer 6 has two configurations, namely as follows: Figure 6 The first form and such Figure 8The second form. In this form, the retainer 6 inserted into the first countersunk hole 4 is circular, and the guide tube 12 is located at the center. In the second countersunk hole 5, the retainer 6 is a rounded rectangle, and the guide tube 12 is located on one side.

[0041] The design employs partition 13 and fins 10, allowing the foot to be lifted when the grouting sealer 7 is about to detach from the first opening 31 or the second opening 32 during removal. At this point, the fins 10 and the curved part 11 engage with the grouting sealer 7, allowing it to detach along with the grouting sealer 7, eliminating the need for a separate removal of the retainer 6 and simplifying the operation. After the grouting sealer 7 is completely removed, the core cavity (first opening 31, second opening 32, and third opening 33) is promptly backfilled with cement-stabilized crushed stone material and compacted to ensure a dense core cavity.

[0042] After the work is completed, the work section will be fully enclosed for curing for 3 days.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A road grouting hole structure, comprising a road base layer and a cavity located beneath the road base layer, characterized in that: It also includes an opening unit that connects the cavity downward along the surface of the road base layer. The opening unit includes a first opening and a second opening arranged in parallel, and a third opening that penetrates the first opening and the second opening in an inclined direction and connects to the cavity.

2. The road grouting hole structure according to claim 1, characterized in that: The first opening and the second opening are arranged perpendicularly and are parallel to each other.

3. The road grouting hole structure according to claim 1, characterized in that: The distance between the first opening and the second opening is A, where 20cm < A < 30cm.

4. The road grouting hole structure according to claim 1, characterized in that: The included angle between the third opening and the first and second openings is α, where 25° < α < 45°.

5. A road grouting hole structure according to claim 1, characterized in that: The perforation unit further includes a first countersunk hole and a second countersunk hole formed on the surface of the road base layer, wherein the first perforation is located in the first countersunk hole, and the second and third perforations are located in the second countersunk hole.

6. A road grouting hole structure according to any one of claims 1-5, characterized in that: The first and second openings are sealed with grouting sealing devices, and the top of the grouting sealing devices is provided with a retainer, which is located in the first and second countersunk holes.

7. A road grouting hole structure according to claim 6, characterized in that: The top of the retainer is flipped outward to form a side pressure plate, which is pressed against the circumferential surface of the road base layer at the top of the first and second countersunk holes.

8. A road grouting hole structure according to claim 6, characterized in that: The bottom of the cage is sealed with a bottom pressure plate, which presses against the bottom surfaces of the first countersunk hole and the second countersunk hole; The bottom pressure plate is provided with a guide tube for the grouting sealing device to pass through, and the guide tube is coaxial with the first opening and the second opening.

9. A road grouting hole structure according to claim 6, characterized in that: The cage has a partition in the middle, and the partition has an opening coaxial with the guide tube. The circumferential groove of the opening forms fins.

10. A road grouting hole structure according to claim 9, characterized in that: The ends of the fins are bent downwards to form curved portions, which abut against the outer wall of the grouting and sealing device.

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