A sea area sleeve valve pipe grouting slurry and a grouting method

Abstract

This invention provides a grouting slurry for marine sleeve valve pipes, comprising slurry A, slurry B, slurry C, and slurry D. Slurry A is for casing material, slurry B is for grouting, and slurries C and D are for sealing. The water-cement ratio of slurries A, B, C, and D is 0.5–1.0. The volume ratio of water glass to water in slurry A is 'a', in slurry B it is 'b', in slurry C it is 'c', and in slurry D it is 'd', satisfying 5 ≥ a > 4 ≥ b > d ≥ 2 > c ≥ 1. This invention ensures the sleeve valve pipe meets time requirements, easily stabilizes pressure, forms a stable protective layer, and allows the slurry to solidify well.

Description

Technical Field

[0001] This invention relates to the field of grouting processing when subway tunnel boring machines are located near or under the sea, and particularly to a grouting slurry and grouting method for a sleeve valve pipe in the sea area. Background Technology

[0002] There is currently a section awaiting construction. The grouting area is located within a submarine fault fracture zone. The geology of the grouting area is mainly composed of strongly weathered fractured rock and strongly weathered mixed granite, with a complex geological environment. The original grouting requirements were: grouting diffusion radius ≥1m, grouting pressure 1.0-2.0MPa, grout injection rate 7-10L / min, and the original grout water-cement ratio of cement slurry 0.5-1.0. During grouting, the outer two rows were sealed with a cement-water glass double-liquid grout with a volume ratio of 1:1, while the rest were reinforced with cement grout. However, conventional surface sleeve valve grouting in marine strata faces difficulties in shell material construction. Submarine sleeve valve grouting is connected to seawater. The method of first using cement grout and then using cement-water glass double-liquid grout for sealing is difficult to form a stable and strong protective layer, resulting in grout dispersion and difficulty in solidifying the grout in the seawater strata. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a marine sleeve valve grouting grout and grouting method that has stable grouting pressure and can form a stable protective layer on the sea surface.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A grouting slurry for marine sleeve valve pipes includes slurry A, slurry B, slurry C, and slurry D. Slurry A is a slurry for casing material, slurry B is a grouting slurry, and slurry C and slurry D are sealing slurries. The water-cement ratio of slurry A, slurry B, slurry C, and slurry D is 0.5 to 1.0. The volume ratio of water glass to water in slurry A is a, the volume ratio of water glass to water in slurry B is b, the volume ratio of water glass to water in slurry C is c, and the volume ratio of water glass to water in slurry D is d, satisfying 5 ≥ a > 4 ≥ b > d ≥ 2 > c ≥ 1.

[0006] As a further improvement to the above technical solution:

[0007] Preferably, a = 5.

[0008] Preferably, b = 4.

[0009] Preferably, c = 1.

[0010] Preferably, d = 2.

[0011] As a general inventive concept, the present invention also provides a grouting method for the aforementioned marine sleeve valve pipe grouting grout, comprising the following steps:

[0012] S1, Drill holes to install the outer sleeve and sleeve valve tube;

[0013] S2, Inject grout A between the outer sleeve and the sleeve valve tube up to 1 meter above the preset grouting area;

[0014] S3, Inject grout C between the outer sleeve and the sleeve valve tube to seal the hole;

[0015] S4, Inject grout B into the grouting inner pipe until the preset grouting area is filled;

[0016] S5, inject grout into the grouting inner pipe and seal the hole with grout D.

[0017] As a further improvement to the above technical solution:

[0018] The bottom of the outer casing is located in the grouting stratum.

[0019] A grouting inner tube is provided inside the sleeve valve tube. A double plug tube is installed on the lower side wall of the grouting inner tube. The inner cavity of the grouting inner tube is connected to the inner cavity of the sleeve valve tube through the double plug tube. Liquid outlet holes are provided at intervals from top to bottom on the outer side wall of the sleeve valve tube.

[0020] A rubber ring is provided around the liquid outlet of the sleeve valve tube near the double-stop tube.

[0021] Compared with the prior art, the advantages of the present invention are as follows:

[0022] The grouting slurry for the marine sleeve valve pipe of this invention uses slurries with different water glass to water volume ratios according to the grouting sequence. The water glass to water volume ratio of slurry A, slurry B, and slurry C decreases sequentially. Slurry A is first used to replace all the mud in the original grouting hole, solving the problem of difficult material feeding of the casing. Finally, slurry C with a short setting time is used to seal the external hole of the sleeve valve pipe, ensuring stability during the subsequent grouting process of slurry B. Then, slurry B is used for grouting, and finally, slurry D with a short setting time is used to seal the hole, ensuring the sleeve valve pipe meets the time requirements and easily stabilizes the pressure.

[0023] The grouting method for marine sleeve valve pipe grouting of the present invention has the following advantages: ① An outer sleeve is installed outside the sleeve valve pipe to protect the surrounding strata, ensuring smooth installation of the sleeve valve pipe and successful implementation of the casing material. ② Grout A is used outside the sleeve valve pipe instead of conventional cement soil and other casing materials, solving the problem of difficult casing material placement. Simultaneously, the strength of the grout can be effectively controlled within the specified construction time according to the grout ratio, which is beneficial to the diffusion and setting of the grout and ensures the stability of grout B during the grouting process. ③ Grout C is used above the casing material as the sealing grout for the sleeve valve pipe, preventing seawater from entering, reducing the impact of seawater on grouting, and ensuring the stability of the grout. ④ Using grout B for grouting results in a more controllable grouting volume, which is closer to the theoretical grouting volume. The grouting pressure can reach the predetermined value, and the grouting process is stable. This solves the technical problems of the original design using cement grout, which resulted in a large grouting volume and insufficient grouting pressure. ⑤ Finally, grout D is used to seal the area above the grouting range inside the sleeve valve pipe. This ensures a seal at the top of the sleeve valve pipe after it is broken, reduces the impact of seawater on the grouting, and fills the space in that area. The above process ensures the sleeve valve pipe meets the time requirements, easily stabilizes pressure, forms a stable protective layer, and allows the grout to solidify well. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the grouting device in Embodiment 1 of the present invention.

[0025] Figure 2 This is a flowchart of the grouting method in Embodiment 1 of the present invention.

[0026] The labels in the diagram represent: 5. Outer casing; 6. Silt formation; 7. Sleeve valve pipe; 8. Shell material; 9. Rubber ring; 10. Grouting inner pipe; 11. Double plug pipe; 12. Grouting formation; 13. Seabed line; 14. Sea level; 15. Grouting core pipe; 16. Sealing grout line. Detailed Implementation

[0027] The present invention will be further described in detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0028] Example 1

[0029] This embodiment of a marine sleeve valve pipe grouting slurry includes slurry A, slurry B, slurry C, and slurry D. Slurry A is a slurry for casing material 8, slurry B is a grouting slurry, and slurry C and slurry D are sealing slurries. The water-cement ratio of slurry A, slurry B, slurry C, and slurry D is 0.5 to 1.0. The volume ratio of water glass to water in slurry A is a, the volume ratio of water glass to water in slurry B is b, the volume ratio of water glass to water in slurry C is c, and the volume ratio of water glass to water in slurry D is d, satisfying 5 ≥ a > 4 ≥ b > d ≥ 2 > c ≥ 1.

[0030] In this embodiment, a = 5, b = 4, c = 1, d = 2. In this invention, slurry C is the external sealing slurry for the sleeve valve tube 7, and slurry D is the internal sealing slurry for the sleeve valve tube 7.

[0031] like Figure 1 As shown, the grouting device in this embodiment includes an outer sleeve 5 and a sleeve valve tube 7. The outer sleeve 5 is sleeved outside the sleeve valve tube 7. A shell material 8 is sleeved between the outer sleeve 5 and the sleeve valve tube 7. A grouting inner tube 10 is provided in the inner cavity of the sleeve valve tube 7. A double plug tube 11 is installed on the lower side wall of the grouting inner tube 10. The inner cavity of the grouting inner tube 10 is connected to the inner cavity of the sleeve valve tube 7 through the double plug tube 11. Liquid outlet holes are provided at intervals from top to bottom on the outer side wall of the sleeve valve tube 7.

[0032] A rubber ring 9 is provided on the outer sleeve of the liquid outlet of the sleeve valve tube 7 near the double stopper tube 11.

[0033] The upper part of the outer casing 5 is located above the sea level 14, passes through the seabed line 13 and the silt stratum 6, and the bottom is located within the grouting stratum 12.

[0034] Theoretical grouting pressure: 1.0-1.5 MPa; grouting volume: 7.7 m³. 3 ,like Figure 2 As shown, the grouting method in this embodiment includes the following steps:

[0035] 1) During grouting drilling, drive the outer casing 5 into the seabed silt layer 1m below.

[0036] 2) Drill a hole inside the outer sleeve 5. After drilling, place the sleeve valve 7 in the center of the hole in the outer sleeve 5 and inject clean water. First, lower the sleeve valve 7, and then lower the grouting core pipe 15.

[0037] 3) Use the grouting core tube 15 to inject grout A into the casing material 8 to replace the mud in the hole. Stop injecting when the casing material 8 (grout A) exceeds the designed preset grouting range by 1m. The components of grout A are in the following volume ratio: cement:water = 1:1, water glass:water = 1:5.

[0038] 4) After grouting is completed, use the grouting core tube 15 to inject grout C into the outer casing 5 and the top of the casing material 8 to seal the hole up to the seabed line 13 (as shown in the attached diagram). Figure 1 (See Figure 16 for the grout line in the middle sealing hole).

[0039] 5) Once the casing material 8 has reached a certain strength, start injecting grout B into the grouting inner pipe 10. The components of grout B are in the following volume ratios: cement:water = 1:1, water glass:water = 1:4.

[0040] 6) After the grout B enters the double plug pipe 11 from the grouting inner pipe 10, it breaks through the rubber ring 9 and the outer casing material 8 and enters the grouting stratum 12 in sections to diffuse, thereby achieving the purpose of stratum reinforcement.

[0041] 7) Grout D is injected into the top surface of the sleeve valve pipe 7 using the grouting inner pipe 10. This is used to seal the top of the sleeve valve pipe 7 after grouting is completed, ensuring stability during and after grouting.

[0042] In this embodiment, the volume ratio of slurry component C is: cement:water = 1:1, water glass:water = 1:1, and the volume ratio of slurry component D is: cement:water = 1:1, water glass:water = 1:2.

[0043] Comparative Example 1

[0044] This comparative example is largely the same as Example 1, except that the volume ratio of water glass to water in slurry A is 4.

[0045] Comparative Example 2

[0046] This comparative example is largely the same as Example 1, except that the volume ratio of water glass to water in slurry A is 6.

[0047] As shown in Table 1, the grouting effect of grout A in Example 1 and Comparative Examples 1-2 is compared. It can be seen from Table 1 that the grouting volume and grouting pressure of grout A in Example 1 are consistent with the theoretical values.

[0048] Table 1 Comparison of grouting effects of different grout types A

[0049]

[0050] Comparative Example 3

[0051] This comparative example is largely the same as Example 1, except that the volume ratio of water glass to water in slurry B is 1.

[0052] Comparative Example 4

[0053] This comparative example is largely the same as Example 1, except that the volume ratio of water glass to water in slurry B is 2.

[0054] Comparative Example 5

[0055] This comparative example is largely the same as Example 1, except that the volume ratio of water glass to water in slurry B is 5.

[0056] Comparative Example 6

[0057] This comparative example is largely the same as Example 1, except that the volume ratio of water glass to water in slurry B is 6.

[0058] Comparative Example 7

[0059] This comparative example is largely the same as Example 1, except that the volume ratio of water glass to water in slurry B is 7.

[0060] Table 2 shows a comparison of the grouting effects of Example 1 and Comparative Examples 3-7. As can be seen from Table 2, the grouting volume and pressure of the grout mix B in Example 1 are consistent with the theoretical values. Insufficient grouting volume results in a small grouting range, failing to achieve the technical goal of filling all formation voids within the predetermined range with grout.

[0061] Table 2 Comparison of grouting effects of different grout materials B

[0062]

[0063]

[0064] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A grouting fluid for grouting in seabed fault fracture zones, characterized in that: It includes slurry A, slurry B, slurry C and slurry D. Slurry A is the slurry for shell material (8), slurry B is the slurry for grouting, and slurry C and slurry D are the slurries for sealing holes. The water-cement ratio of slurry A, slurry B, slurry C and slurry D is 0.5 to 1.

0. The volume ratio of water glass to water in slurry A is a, the volume ratio of water glass to water in slurry B is b, the volume ratio of water glass to water in slurry C is c, and the volume ratio of water glass to water in slurry D is d, satisfying 5≥a>4≥b>d≥2>c≥1; The grouting method for the marine sleeve valve pipe grouting grout. Includes the following steps: S1, Drill holes to install the outer sleeve (5) and the sleeve valve tube (7); S2, inject grout A between the outer sleeve (5) and the sleeve valve (7) up to 1 meter above the preset grouting area; S3, inject slurry C between the outer sleeve (5) and the sleeve valve tube (7) to seal the hole; S4, inject grout B into the grouting inner pipe (10) until the preset grouting area is filled; S5, inject grout D into the grouting inner pipe (10) to seal the hole.

2. The grouting slurry for marine sleeve valve pipes according to claim 1, characterized in that: a=5。 3. The grouting slurry for marine sleeve valve pipes according to claim 1, characterized in that: b=4。 4. The grouting slurry for marine sleeve valve pipes according to claim 1, characterized in that: c=1。 5. The grouting slurry for marine sleeve valve pipes according to claim 1, characterized in that: d=2。 6. A grouting method for marine sleeve valve pipe grouting grout according to any one of claims 1 to 5, characterized in that: Includes the following steps: S1, Drill holes to install the outer sleeve (5) and the sleeve valve tube (7); S2, inject grout A between the outer sleeve (5) and the sleeve valve (7) up to 1 meter above the preset grouting area; S3, inject slurry C between the outer sleeve (5) and the sleeve valve tube (7) to seal the hole; S4, inject grout B into the grouting inner pipe (10) until the preset grouting area is filled; S5, inject grout D into the grouting inner pipe (10) to seal the hole.

7. The grouting method according to claim 6, characterized in that: The bottom of the outer casing (5) is located in the grouting stratum (12).

8. The grouting method according to claim 6, characterized in that: A grouting core tube (15) is installed between the outer sleeve tube (5) and the sleeve valve tube (7).

9. The grouting method according to any one of claims 6 to 8, characterized in that: A grouting inner tube (10) is provided in the inner cavity of the sleeve valve tube (7). A double plug tube (11) is installed on the lower side wall of the grouting inner tube (10). The inner cavity of the grouting inner tube (10) is connected to the inner cavity of the sleeve valve tube (7) through the double plug tube (11). Liquid outlet holes are provided at intervals from top to bottom on the outer side wall of the sleeve valve tube (7).

10. The grouting method according to claim 9, characterized in that: A rubber ring (9) is provided on the outer sleeve of the liquid outlet of the sleeve valve tube (7) near the double plug tube (11).

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