Shield construction pea gravel injection plug device

Abstract

A pea gravel injection plug device for shield construction comprises an inner shell, the inner shell is installed on a segment grouting hole through an outer shell on the outer side, and the inner shell rotates in the circumferential direction relative to the outer shell; the upper end of the inner shell is rotatably connected with blowing-in equipment, a grease injection nozzle is arranged on the side wall of the inner shell and sequentially communicated with a hollow cavity in the pipe wall of the inner shell and grease injection holes, the grease injection holes are distributed in the circumferential direction of the pipe wall of the inner shell, and the lower ends of the grease injection holes penetrate through the inner shell. According to the pea gravel injection plug device for shield construction, on one hand, the pea gravel injection angle can be controlled, on the other hand, shield tail grease can be rapidly injected for water stop after pea gravel injection is finished, the pea gravel injection effect is improved, and meanwhile the procedure connection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of shield construction for underground tunnels, in particular to a plug device for injecting pea gravel in shield construction. Background Technique

[0002] With the wide application of the shield method in the high-quality development of fields such as municipal transportation, water conservancy and hydropower, and urban subways in China, the shield technology has become more mature and perfect, and has gradually become the first choice for urban underground tunnel construction. When the shield machine is tunneling in the full-section rock layer, the gap between the segment and the surrounding rock needs to be filled with pea gravel. Generally, a steel hollow steel pipe is directly selected and inserted into the segment grouting hole, and then the steel pipe is connected to the pea gravel blowing equipment for pea gravel filling. However, using this method will, on the one hand, make the pea gravel filling uneven, and on the other hand, if secondary grouting is not carried out in time after the pea gravel filling, water seepage will occur in the grouting hole. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a plug device for injecting pea gravel in shield construction, which can, on the one hand, make the pea gravel dispersed more evenly, and on the other hand, can quickly inject tail grease for water stop after the pea gravel is blown in to prevent water seepage from occurring in the grouting hole.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is:

[0005] A plug device for injecting pea gravel in shield construction includes an inner shell, and the inner shell is installed on the segment grouting hole through an outer shell on the outside, and the inner shell rotates circumferentially relative to the outer shell; the upper end of the inner shell is rotatably connected to the blowing equipment, and a grease injection nozzle is provided on the side wall of the inner shell. The grease injection nozzle is sequentially communicated with a hollow cavity in the inner shell pipe wall and a grease injection hole. The grease injection holes are distributed circumferentially along the inner shell pipe wall and penetrate the inner shell at the lower end.

[0006] The inner shell is a steel pipe.

[0007] An inclined cutting opening is provided at the bottom of the inner shell, and the lowest point of the inclined cutting opening does not cut one side wall of the inner shell, and the highest point does not exceed the outside of the segment for shield lining.

[0008] The cutting angle of the inclined cutting opening θ The range is as follows:

[0009]

[0010] Wherein: D is the diameter of the inner shell 1, T is the wall thickness of the inner shell 1, R 1 is the excavation radius, R 2 is the segment radius.

[0011] A rotary bearing is welded to the top of the inner shell, and the inner shell is rotatably connected to the blowing equipment through the rotary bearing.

[0012] The inner shell is circumferentially provided with first engaging teeth, the top end of the outer shell is provided with second engaging teeth, and a rotating grip is sleeved outside the inner shell between the first engaging teeth and the second engaging teeth. When the rotating grip moves up and down, it engages and clamps with the first engaging teeth or the second engaging teeth respectively.

[0013] The outer side wall of the lower part of the outer shell is provided with spiral external threads, and the spiral external threads are in threaded connection with the segment grouting hole.

[0014] A limiting ring is fixed on the inner shell, and a ring groove is arranged on the inner side of the corresponding outer shell. The limiting ring is in sliding fit with the ring groove and is limited up and down.

[0015] A blocking ring is fixed below the limiting ring. The blocking ring is located at the lower end of the outer shell and contacts the bottom end surface of the outer shell.

[0016] The utility model provides a shield construction pea gravel injection plug device, which has the following technical effects:

[0017] 1). By rotatably connecting the inner shell with the outer shell and the blowing device respectively, when in use, the inner shell can be driven to rotate by rotating the rotating grip; and by adopting an inclined cutting opening and limiting the cutting angle of the inclined cutting opening, the injection direction of the pea gravel can be controlled when the inclined cutting opening rotates, solving the problems of uneven injection and easy accumulation of pea gravel in the prior art.

[0018] 2). By arranging a grease injection nozzle on the inner shell, the grease injection nozzle is sequentially communicated with the hollow cavity in the inner shell pipe wall and the grease injection hole. The shield tail grease can be injected to the outer side of the pipe wall through the top grease injection nozzle to form a water stop ring without removing the device, reducing the phenomenon of segment water overflow caused by untimely secondary grouting, with convenient and simple operation and improved process connection efficiency. Description of the Drawings

[0019] The following further describes the utility model with reference to the drawings and embodiments:

[0020] Figure 1 It is a schematic structural diagram of the utility model.

[0021] Figure 2 It is a schematic diagram of the inner shell in the utility model.

[0022] Figure 3 It is the cutting angle of the inner shell in the utility model θ Schematic diagram.

[0023] Figure 4 It is a schematic diagram of the outer shell in the utility model.

[0024] Figure 5 It is a sectional view of the utility model.

[0025] In the figure: inner shell 1, outer shell 2, rotating grip 3, grease injection nozzle 4, rotating bearing 5, grease injection hole 6, first engaging tooth 12, blocking ring 13, limiting ring 14, hollow cavity 15, spiral external thread 21, second engaging tooth 22, annular groove 23, spiral internal thread 41. Detailed implementation mode

[0026] As Figure 1 shown, a gravel injection plug device for shield construction includes an inner shell 1, an outer shell 2, a rotating grip 3, a grease injection nozzle 4, a rotating bearing 5 and a grease injection hole 6.

[0027] As Figure 2 shown, the inner shell 1 is made of steel structure, and its overall shape is a long steel pipe, which can withstand high pressure. There is an inclined cut opening at the bottom. When injecting gravel, the inner shell 1 is rotated by turning the rotating grip 3, and the gravel will be ejected through the direction of the inclined cut opening to control the gravel injection angle.

[0028] As Figure 3 shown, it is advisable that the lowest point of the inclined cut opening at the bottom of the inner shell 1 does not cut one side wall of the inner shell 1, and the highest point does not exceed the outside of the segment for shield lining. The cutting angle θ range is as follows:

[0029]

[0030] Wherein: D is the diameter of the inner shell 1, T is the wall thickness of the inner shell 1, R 1 is the excavation radius, R 2 is the segment radius.

[0031] Taking the first bid section of the Shenzhen Airport to Daya Bay Intercity Railway under construction as an example, the excavation radius R 1 is 4570mm, the segment radius R 2 is 4400mm, the diameter of the inner shell of the device D is 90mm, and the wall thickness of the inner shell T is 10mm. Then the calculated inclined cut angle θ range is 45° to 64°.

[0032] As Figure 1 shown, a rotating bearing 5 is welded to the top of the inner shell 1, which can be a ball bearing or a cylindrical roller bearing, etc. The inner ring of the rotating bearing 5 is connected to the inner shell 1 by welding, and the outer ring of the rotating bearing 5 is connected and fixed to the blowing equipment by a hoop. When injecting gravel, the rotating bearing 5 can ensure the normal rotation of the inner shell 1 during gravel injection.

[0033] As Figure 2As shown in the figure, several first teeth 12 are attached to the inner shell 1. The first teeth 12 are welded to the outer wall of the inner shell 1 and are circumferentially distributed. The second teeth 22 are provided opposite to the first teeth 12 at the top of the outer shell 2. A rotating grip 3 is sleeved on the inner shell 1 between the first teeth 12 and the second teeth 22. The rotating grip 3 can move up and down or rotate relative to the inner shell 1. The rotating grip 3 includes an annular tube. Grooves are provided at both the upper and lower parts of the annular tube. The grooves are engaged with the first teeth 12 on the inner shell 1 and the second teeth 22 on the outer shell 2. A handle is provided on the outer wall of the annular tube in the radial direction. The handle facilitates the operation of the rotating grip 3.

[0034] Pull up the rotating grip 3. When the rotating grip 3 is engaged with the first teeth 12 on the inner shell 1, the rotation of the inner shell 1 can be controlled by rotating the rotating grip 3. Press down the rotating grip 3. When the rotating grip 3 is engaged with the second teeth 22 on the outer shell 2, the rotation of the outer shell 2 can be controlled.

[0035] As Figure 2 , Figure 4 As shown in the figure, an outer shell 2 is sleeved on the inner shell 1. A spiral external thread 21 is provided on the outer side wall of the lower part of the outer shell 2. The second teeth 22 are provided at the top of the outer shell 2. The outer shell 2 can be connected to the thread on the segment grouting hole through the spiral external thread 21. The second teeth 22 facilitate the cooperation with the rotating grip 3 and drive the rotation through the rotating grip 3.

[0036] Another annular groove 23 is provided inside the outer shell 2. The annular groove 23 is engaged with the limiting ring 14 on the inner shell. Another blocking ring 13 is provided on the inner shell 1 below the limiting ring 14. The blocking ring 13 is located below the outer shell 2 and contacts the lower end face of the outer shell 2. The blocking ring 13 and the limiting ring 14 are used to limit the up and down movement of the outer shell 2, so that the outer shell 2 can only make a circumferential movement around the inner shell 1 and cannot perform displacement in other directions.

[0037] As Figure 4 As shown in the figure, a grease injection nozzle 4 is provided at the upper part of the inner shell 1. The grease injection nozzle 4 is communicated with an annular hollow cavity 15 in the pipe wall of the inner shell 1. A grease injection hole 6 is provided in the pipe wall of the inner shell 1 below the hollow cavity 15. The grease injection holes 6 are distributed circumferentially around the pipe wall of the inner shell 1 and are vertically arranged. The upper end of the grease injection hole 6 is communicated with the hollow cavity 15, and the lower end of the grease injection hole 6 penetrates through the inner shell 1 and communicates with the outside. There is a spiral internal thread 41 on the inner wall of the grease injection nozzle 4. After the pea gravel is injected, a grease injection device is connected through the grease injection nozzle 4. The grease enters the hollow cavity 15 through the grease injection nozzle 4, and then is dispersed into the grease injection holes 6 in the pipe wall of the inner shell 1 through the hollow cavity 15 and flows vertically downward. The injected grease is evenly dispersed through the grease injection holes 6 to achieve a good water stop effect.

Claims

1. A pea gravel injection plug device for shield construction, characterized in that: The invention comprises an inner shell (1), wherein the inner shell (1) is mounted on a grouting hole of a pipe segment through an outer shell (2) on the outside, and the inner shell (1) rotates circumferentially relative to the outer shell (2); the upper end of the inner shell (1) is rotatably connected to a blowing device, and a grease injection nozzle (4) is provided on the side wall of the inner shell (1), and the grease injection nozzle (4) is sequentially connected to a hollow cavity (15) in the pipe wall of the inner shell (1) and a grease injection hole (6), and the grease injection hole (6) is distributed circumferentially along the pipe wall of the inner shell (1) and the lower end thereof penetrates the inner shell (1).

2. A shield construction pea gravel injection plug device according to claim 1, characterized in that: The inner shell (1) is a steel pipe.

3. A shield construction pea gravel injection plug device according to claim 2, characterized in that: The bottom of the inner shell (1) is provided with an oblique opening, the lowest point of the oblique opening does not cut the pipe wall on one side of the inner shell (1), and the highest point does not exceed the outer side of the pipe segment used for shield lining.

4. A shield construction pea gravel injection plug device according to claim 3, characterized in that: The cutting angle of the bevel opening θ The range is as follows: in: D is the diameter of the inner shell (1), T is the wall thickness of the inner shell (1), R 1 is the excavation radius, R 2 is the segment radius.

5. The shield construction pea gravel injection plug device according to claim 1, characterized in that: A rotary bearing (5) is welded to the top of the inner shell (1), and the inner shell (1) is rotatably connected to the blowing device via the rotary bearing (5).

6. A shield construction pea gravel injection plug device according to claim 1, characterized in that: The inner shell (1) is provided with a first latching tooth (12) on the circumferential side, the outer shell (2) is provided with a second latching tooth (22) on the top, and the outer shell (1) is provided with a rotating handle (3) between the first latching tooth (12) and the second latching tooth (22). The rotating handle (3) is respectively engaged and clamped with the first latching tooth (12) or the second latching tooth (22) when moving up and down.

7. The shield construction pea gravel injection plug device according to claim 1, characterized in that: The outer side wall of the lower part of the shell (2) is provided with a spiral outer thread (21), and the spiral outer thread (21) is threadedly connected to the grouting hole of the pipe segment.

8. The shield construction pea gravel injection plug device according to claim 1, characterized in that: A limiting ring (14) is fixed on the inner shell (1), and a corresponding annular groove (23) is provided on the inner side of the outer shell (2). The limiting ring (14) and the annular groove (23) are slidably matched to each other and limit the upper and lower positions.

9. A shield construction pea gravel injection plug device according to claim 8, characterized in that: A block ring (13) is fixed below the limiting ring (14); the block ring (13) is located at the lower end of the outer shell (2) and is in contact with the bottom end surface of the outer shell (2).

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