A repeatable grouting steel lining contact grouting system and grouting construction method

Abstract

The present application provides a repeatable grouting steel lining contact grouting system, comprising a steel lining arranged on the surface of concrete, and a grouting pipe arranged between the steel lining and the concrete, wherein the two ends of the grouting pipe are respectively provided with a grouting pipe line and a exhaust backfill pipe line which are in communication with the inside of the grouting pipe; the grouting system divides the whole contact grouting area into several connected grouting subareas; several grouting pipes are arranged in the grouting subareas and are in parallel arrangement through the grouting pipe line and the exhaust backfill pipe line in the grouting subareas, and the grouting subareas are provided with exhaust grooves which are in communication with the outside. The repeatable grouting system can realize the contact grouting treatment between the steel lining and the concrete, and can effectively and obviously reduce the number and range of the void area after grouting through the repeatable grouting pipe, so as to ensure the grouting construction quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water conservancy and hydropower engineering, in particular to a steel lining contact grouting system capable of repeated grouting and a grouting construction method. BACKGROUND

[0002] The water retaining structure of reinforced concrete or mortar stone material such as concrete gravity dam and arch dam is a widely used structure form in water conservancy and hydropower engineering. The flood discharge hole is an important hydraulic structure arranged in the concrete dam, which mainly functions to control flood discharge, reasonably regulate the reservoir operating water level, and ensure the safety of flood control and flood regulation of the hydropower station. The channel of the dam flood discharge hole is prone to damage by cavitation of high-speed water flow and impact of suspended load such as silt during flood discharge, so the entire channel flow section of the flood discharge hole usually adopts steel lining measures to ensure the structural safety of the flood discharge hole. The flood discharge hole has complex structure, many steel bars, and many construction procedures, and the bottom of the steel lining structure is in a narrow space constraint, so the contact grouting of the bottom of the steel lining is a weak link in the quality control of the concrete construction of the flood discharge hole, which needs to be highly valued.

[0003] At present, the contact grouting construction methods between the steel lining and the concrete mainly include the drilling contact grouting method, the reserved hole contact grouting method, and the pre-embedded grouting pipe contact grouting method. The drilling contact grouting method uses welding to supplement the holes, which is easy to cause the strength of the opening part of the steel plate to decrease, and there is a risk of not sealing the hole tightly, so it is only suitable for small-scale contact grouting construction or repair of void areas, and it is difficult to be applied to large-scale steel lining contact grouting construction. The grouting effect of the reserved hole contact grouting method and the pre-embedded grouting pipe contact grouting method is poor, and after grouting, there are many and large void areas, and repeated grouting construction cannot be carried out, and the void problem cannot be effectively compensated by repeated grouting. The contact grouting between the steel lining and the concrete using the above methods cannot achieve large-scale and high-quality construction, and it is difficult to deal with the void problem, which may significantly increase the construction amount, construction complexity and construction period, resulting in poor economic efficiency of the construction. SUMMARY

[0004] The first object of the present application is to provide a grouting system capable of repeated grouting multiple times to achieve efficient and large-scale contact grouting construction. To this end, the present application adopts the following technical solutions:

[0005] The application relates to a repeatable grouting steel lining contact grouting system, which comprises a steel lining arranged on the surface of concrete, and a grouting pipe arranged between the steel lining and the concrete, wherein a grouting pipe line and an air exhaust grouting pipe line are arranged at the two ends of the grouting pipe and communicate with the inside of the grouting pipe; the grouting system divides the whole contact grouting area into a plurality of connected grouting subareas; a plurality of grouting pipes are arranged in the grouting subareas and are arranged in parallel through the grouting pipe line and the air exhaust grouting pipe line in the grouting subareas; an exhaust groove communicating with the outside is arranged in the grouting subarea; a first interval connecting layer is arranged between the exhaust groove and the steel lining; the grouting pipe comprises an outer sleeve pipe and an inner core through which grout flows during grouting; an outer grout hole is arranged through the wall of the outer sleeve pipe, and an inner grout hole is arranged through the wall of the inner core; the outer grout hole and the inner grout hole are staggered and distributed at non-coinciding positions; and the outer sleeve pipe has an elastic property and forms a one-way outer isolation part for grout, so that the grouting pipe can be repeatedly grouted.

[0006] Further, the grouting pipe extends along the circumferential direction of the steel lining and is arranged in parallel along the axial direction of the steel lining.

[0007] Further, a grouting groove is arranged on the steel lining and surrounds the grouting pipe; the outer surface of the grouting groove is fixedly connected with the concrete; a second interval connecting layer is arranged between the grouting groove and the bottom plate part of the steel lining, so as to guide the discharge of mud.

[0008] Further, a plurality of guide pipes are arranged in the grouting pipe line; the plurality of guide pipes are connected with the plurality of grouting pipes in an interval; the guide pipe comprises a grout inlet pipe and a grout return pipe which communicate with each other; the grout inlet pipe communicates with the inner core of the grouting pipe; and the grout return pipe is led to the back of a dam or a gallery to discharge grout.

[0009] Further, an air exhaust grouting pipe is arranged in the air exhaust grouting pipe line and cooperates with the grouting pipe line; the air exhaust grouting pipe is led to the back of a dam or a gallery to discharge air and grout.

[0010] Further, the steel linings in adjacent grouting subareas are connected with each other through a steel lining pipe joint.

[0011] Further, an exhaust and vibration hole communicating with the concrete contact surface is arranged through the steel lining.

[0012] Further, the whole contact grouting area can be connected in series along the axial direction of the steel lining to realize whole and overall contact grouting.

[0013] The second object of the present application is to provide a grouting construction method for reducing the number and range of voids after grouting.

[0014] A repeatable grouting steel lining contact grouting construction method;

[0015] S1: The grouting system installation: the repeatable grouting grouting pipe is fixed on the steel lining surface with the grouting tank; the grouting partition can be adjusted according to the actual pouring situation, and the grouting pipe and the exhaust back grouting pipe are concentrated to the downstream dam surface or the nearby corridor;

[0016] S2: Contact grouting construction: the steel lining contact grouting requires that the concrete cooling of the steel lining bottom plate part ends after the second stage, and it is suitable to be carried out in the low temperature period;

[0017] Before grouting, pre-grouting inspection should be done, including pipe connection, pipe unobstructed, steel lining void, etc.

[0018] During the grouting process, the steel lining is knocked and vibrated with a hammer to facilitate the absorption of grout and the exhaust of air; during grouting, grouting starts from one side, and after the other side exhausts the air in the pipe and discharges the grout, it is blocked at this time, at this time the grout will be discharged from the outer grout hole of the grouting pipe and injected into the gap, and the air in the gap will be discharged from the pre-embedded exhaust groove;

[0019] The grouting of different grouting partitions should be carried out in turn from low to high, and should be started from the downstream grouting partition and gradually pushed to the other side of the upstream grouting partition; under the specified pressure, the maximum concentration grout stops absorbing grout, and continues to grout for 5 minutes, and the grouting is ended;

[0020] When the exhaust groove exhausts or discharges the grout, the reverse grouting can be carried out immediately after the second forward grouting is completed;

[0021] S3: Grouting quality inspection: grouting quality inspection is carried out 7 days after grouting is completed, and the void range and degree should meet the design requirements, and if there is still void after grouting inspection, repeat grouting (2-3) times should be carried out by using the pre-embedded grouting pipe.

[0022] Further: During the grouting quality inspection, drilling grouting should be used for the parts that cannot be grouted by repeat grouting; no less than 2 holes should be arranged for each independent void area, and holes should be arranged at the lowest and highest positions;

[0023] Grouting should start from the low place, and the steel lining should be knocked and vibrated during grouting, the grouting pressure in the large area void area is controlled at 0.1 MPa, the independent void area is controlled at 0.15 MPa, the maximum concentration grout stops absorbing grout, and continues to grout for 5 minutes, and the grouting is ended;

[0024] After the grouting is finished, the hole is sealed by welding, and then is ground.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The repeated grouting system can realize the contact grouting treatment between the steel lining and the concrete, and can effectively and obviously reduce the number and range of the void areas after grouting by the repeated grouting pipe, so that the grouting construction quality is guaranteed, the construction difficulty is reduced, the construction efficiency is improved, and the repair work on the void areas after grouting is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the steel lining bottom contact grouting pipe arrangement of the present application;

[0028] Figure 2 It is a sectional schematic diagram of the repeated grouting pipe fixed by the grouting groove of the present application;

[0029] Figure 3 It is a schematic diagram of the repeated grouting pipe fixed by the grouting groove of the present application Figure 2 It is a schematic diagram of the repeated grouting pipe fixed by the grouting groove of the present application

[0030] Figure 4 It is a schematic diagram of the repeated grouting pipe fixed by the grouting groove of the present application Figure 2 It is a schematic diagram of the repeated grouting pipe fixed by the grouting groove of the present application

[0031] Figure 5 It is a sectional schematic diagram of the repeated grouting pipe of the present application;

[0032] Figure 6 It is a schematic diagram of the internal and external structures of the repeated grouting pipe of the present application.

[0033] The marks in the drawings are: steel lining 1, transverse stiffening rib 11, longitudinal stiffening rib 12, air venting and vibrating hole 13, steel lining pipe joint split 14, grouting groove 2, air venting groove 3, first spaced connection layer 31, grouting pipe 4, outer sleeve pipe 41, inner core 42, inner grouting outlet hole 43, outer grouting outlet hole 44, grouting pipe 5, grouting inlet pipe 51, grouting return pipe 52, air venting and grouting return pipe 6, air venting and grouting return pipe 61, grouting partition 7. DETAILED DESCRIPTION

[0034] The present application will be further described below in combination with the drawings and examples, but it is not used as the basis for limiting the present application.

[0035] For example, Figures 1-6As shown, a repeatable grouting steel lining contact grouting system includes a steel lining 1 arranged on the surface of concrete, and a grouting pipe 4 arranged between the steel lining 1 and the concrete, and a grouting pipe line 5 and an exhaust backfill pipe line 6 arranged at both ends of the grouting pipe 4 and communicated with the inside of the grouting pipe 4. The grouting system divides the whole contact grouting area into several connected grouting subareas 7. Several grouting pipes 4 are arranged in parallel in the grouting subarea 7 through the grouting pipe line 5 and the exhaust backfill pipe line 6, and the grouting subarea 7 is provided with an exhaust groove 3 communicated with the outside, and the exhaust groove 3 and the steel lining 1 are provided with a first spaced connection layer 31. The grouting pipe 4 includes an outer sleeve pipe 41 and an inner core 42 for the flow of slurry during grouting. The outer sleeve pipe 41 is provided with an outer slurry hole 44, and the inner core 42 is provided with an inner slurry hole 43. The outer slurry hole 44 and the inner slurry hole 43 are staggered and distributed at non-coincident positions, and the outer sleeve pipe 41 has an elastic property and forms a one-way outer isolation part for the slurry, so that the grouting pipe 4 can be repeatedly grouted.

[0036] The whole contact grouting area can be realized by the axial series connection of the steel lining 1 and the grouting subarea 7. Figure 1 The length of each grouting subarea 7 is 10-15m, and the parallel arrangement of the repeatable grouting pipe 4 can ensure a high grouting guarantee rate.

[0037] The exhaust groove 3 and the grouting pipe 4 are arranged along the direction of the transverse stiffening rib 11. The exhaust groove 3 protrudes from both sides of the steel lining 1 and is provided with an exhaust steel pipe at both ends, and the exhaust groove 3 can be arranged in multiple groups in the grouting subarea 7.

[0038] As shown in the figure, Figures 5-6 In this embodiment, the inner core 42 is made of PVC material, and the outer sleeve pipe 41 is made of rubber material. When the slurry flows outwards, the outer sleeve pipe 41 can expand due to its elasticity. When the slurry enters the inner core 42 from the outside, the inner slurry hole 43 and the outer slurry hole 44 are not at the same angle, which forms a closure, so as to achieve the one-way fluid effect of the slurry. The outer diameter of the outer sleeve pipe 41 is 38mm, the inner diameter of the inner core 42 is 22mm, and the inner slurry hole 43 and the outer slurry hole 44 are greater than or equal to 5mm. The inner slurry hole 43 and the outer slurry hole 44 are staggered and evenly arranged in four rows on the inner core 42 and the outer sleeve pipe 41, respectively. The inner slurry hole 43 and the outer slurry hole 44 can be displayed on the same longitudinal section.

[0039] Wherein, the repeatable grouting pipe 4 is cleaned by high pressure air and clean water through the grouting pipe line 5 after repeated grouting, so as to prevent the residual mortar from blocking the pipe. Therefore, the quantity and range of the void area after grouting can be effectively reduced by the repeated grouting system, so that the grouting construction quality is guaranteed, and the repair work after grouting is reduced without increasing the construction period.

[0040] As shown in Figures 1-4 , the grouting groove 2 is arranged on the steel lining 1 to surround the grouting pipe 4, and the outer surface of the grouting groove 2 is fixedly connected with the concrete. The second spaced connection layer 21 is arranged between the grouting groove 2 and the bottom plate part of the steel lining 1 to form the guiding and discharging of the mortar.

[0041] Wherein, the grouting pipe 4 is tightly attached to the bottom plate part of the steel lining 1 through the grouting groove 2. The grouting effect is more uniform through the grouting groove 2.

[0042] Wherein, the grouting groove 2 and the exhaust groove 3 are both C-shaped grooves, and the protruding part of the C-shaped groove is point-welded with the steel lining 1 to form the first spaced connection layer 31 or the second spaced connection layer 21, so that the slurry is discharged or the air is discharged from the gap between the C-shaped groove and the steel lining 1 without welding. The C-shaped groove is formed by a steel sheet with a thickness of 0.5 mm.

[0043] As shown in Figure 1 , a plurality of guide pipes are arranged in the grouting pipe line 5, and the plurality of guide pipes are in spaced communication with the plurality of grouting pipes 4. The guide pipe includes the slurry inlet pipe 51 and the slurry return pipe 52 which are in communication with each other, the slurry inlet pipe 51 is in communication with the inner core 42 of the grouting pipe 4, and the slurry return pipe 52 is led to the back of the dam or the corridor for discharging the slurry. In the embodiment, two groups of guide pipes are arranged, and the slurry inlet pipes 51 in the two groups of guide pipes are in communication with the inner cores 42 in the plurality of grouting pipes 4 through the side walls thereof, so as to ensure that the pressure of the slurry flowing in the inner core 42 can be satisfied.

[0044] As shown in Figure 1 , the air and slurry return pipe line 6 is arranged in the grouting pipe line 5. The air and slurry return pipe 61 is arranged in the air and slurry return pipe line 6 to cooperate with the grouting pipe line 5. The air and slurry return pipe 61 is led to the back of the dam or the corridor for discharging the air and the slurry. The two ends of the air and slurry return pipe 61 are both in communication with the inner core 42. In the embodiment, the air and slurry return pipe 61 is arranged in two groups, and the two groups of air and slurry return pipes 61 are in spaced communication with the inner cores of the plurality of grouting pipes 4, so as to avoid congestion of the slurry during discharging.

[0045] As shown in Figure 1As shown, the steel lining 1 bottom plate part is provided with transverse stiffening ribs 11 and longitudinal stiffening ribs 12 to increase the contact surface with concrete. The transverse stiffening ribs 11 are arranged horizontally with the embedded direction of the grouting pipe 4.

[0046] As shown, Figure 1 As shown, the steel lining 1 bottom plate part is provided with transverse stiffening ribs 11 and longitudinal stiffening ribs 12 to increase the contact surface with concrete. The transverse stiffening ribs 11 are arranged horizontally with the embedded direction of the grouting pipe 4.

[0047] As shown, Figure 1 As shown, the steel lining 1 bottom plate part is provided with transverse stiffening ribs 11 and longitudinal stiffening ribs 12 to increase the contact surface with concrete. The transverse stiffening ribs 11 are arranged horizontally with the embedded direction of the grouting pipe 4.

[0048] As shown, Figures 1-6 When the steel lining contact grouting construction of the grouting system is carried out and the repeated grouting is possible, the specific construction steps are as follows:

[0049] S1: Install the grouting system:

[0050] Before installation, clean the surface of the steel lining 1 to ensure that there are no sundries and oil stains, etc.

[0051] Use the grouting groove 2 to fix the repeated grouting grouting pipe 4 on the surface of the steel lining 1, and the grouting groove 2 is spot welded with the bottom plate of the steel lining 1, and the gap between the welding points is used for grouting, and the exhaust groove 3 is also spot welded with the bottom plate of the steel lining 1, and the gap between the welding points is used for exhaust;

[0052] Strengthen the protection of the grouting pipe 4, the grouting pipe 5 and the exhaust grouting pipe 6 during the concrete pouring process, and if damaged, it should be repaired or replaced in time to prevent mortar from entering the pipe and causing pipe blockage; if mortar seeps into the pipe due to pipe body extrusion deformation or damage during pouring, the mortar in the pipe should be cleaned immediately with high-pressure gas and clean water to prevent pipe blockage;

[0053] The grouting partition 7 can be adjusted according to the actual pouring situation on site, and the grouting pipe 5 and the exhaust grouting pipe 6 are concentrated to the downstream dam surface or the nearby corridor, and the two ends are protected with adhesive tape to prevent blockage;

[0054] When two or more grouting pipes 4 are used for lapping on the same grouting path, the lapping length of the grouting pipe 4 is greater than or equal to 10 cm;

[0055] S2: Contact grouting construction:

[0056] The steel lining 1 contact grouting requires that the concrete cooling of the steel lining 1 bottom plate part is completed after the second stage cooling, and it is better to be carried out in a low temperature period; the contact grouting requires that the concrete covering thickness of the steel lining 1 top plate is not less than 12 m;

[0057] Before grouting, the pre-grouting inspection should be done, including the connection of pipeline, the smoothness of pipeline, the void of steel lining, etc. The water and air should be washed before grouting, and the washing pressure is 80% of the grouting pressure;

[0058] It should be noted that the strength grade of cement used for grouting should not be lower than P.O42.5, and the residue of cement passing through 80 μm square hole sieve should not be more than 5%; the water-cement ratio of slurry can be 0.8, 0.6 (or 0.55), and water reducing agent should be added to the slurry; the grouting pressure should be 0.2 MPa, and the grouting pressure should be strictly controlled during the grouting process, and the specific grouting pressure can be adjusted according to the actual situation of steel lining, but should not be greater than 0.3 MPa; the deformation of steel lining should be continuously observed during the grouting process, and the deformation of steel lining should not be more than 2 mm per meter;

[0059] During the grouting process, the steel lining 1 is knocked by hammer to facilitate the absorption of slurry and the discharge of air; during the grouting process, the steel lining 1 is knocked by hammer to facilitate the absorption of slurry and the discharge of air; during the grouting, the grouting is started from one side, and after the air in the pipe is discharged and the slurry is discharged from the other side, it is blocked at this time, and the slurry is discharged from the slurry outlet hole 44 of the grouting pipe 4 and injected into the gap, and the air in the gap is discharged from the embedded air groove 3;

[0060] The grouting of different grouting partitions 7 should be carried out from low to high in turn, and should be carried out from the downstream side to the other side of the upstream side; under the specified pressure, the maximum concentration slurry stops absorbing slurry, and the grouting is continued for 5 minutes, and the grouting is ended;

[0061] When the air groove is not smooth, the reverse grouting can be carried out immediately after the second forward grouting is completed;

[0062] S3: Grouting quality inspection after grouting:

[0063] The grouting quality inspection is carried out 7 days after the grouting is completed, and the hammering and knocking method is generally used for the inspection, and the knocking tool should not be iron hammer, and wooden hammer or rubber hammer can be used;

[0064] The void range and degree should meet the design requirements, and the independent void area should not be greater than 0.2 m 2 , and the void part should not be concentrated, and if there is still void after the grouting, the embedded grouting pipe 4 should be used for repeated grouting 2-3 times;

[0065] The part that cannot be grouted by repeated grouting should be drilled and grouted; the hole is opened by magnetic base electric drill, and the hole diameter should not be less than 12 mm, and the hole should be arranged in each independent void area not less than 2, and the lowest and highest parts should be arranged with holes;

[0066] The grouting should start from the lower part, and the steel lining 1 is knocked and vibrated during the grouting process, the grouting pressure is controlled at 0.1 MPa in the large-area void area, and is controlled at 0.15 MPa in the independent void area, the maximum concentration slurry stops absorbing the slurry, and the grouting is continued for 5 min, and then the grouting is finished;

[0067] After the grouting is finished, the holes are sealed by welding, and the surface is ground flat by a grinding wheel after welding.

[0068] The above embodiment is only one of the more optimal technical solutions of the present application, and those skilled in the art should understand that the technical solutions or parameters in the embodiment can be modified without departing from the principles and essence of the present application, and should be covered within the protection scope of the present application.

Claims

1. A repeatable grouting steel lining contact grouting system, comprising a steel lining (1) covering a concrete surface, and a grouting pipe (4) prearranged between the steel lining (1) and the concrete, with a grouting pipe line (5) and an air exhaust grouting pipe line (6) respectively arranged at both ends of the grouting pipe (4) and communicating with the interior of the grouting pipe (4); characterized in that: the grouting system divides the overall contact grouting area into a plurality of connected grouting subareas (7); a plurality of the grouting pipes (4) are arranged in parallel in the grouting subareas (7) through the grouting pipe lines (5) and the air exhaust grouting pipe lines (6) in the grouting subareas (7), and the grouting subareas (7) are pre-embedded with exhaust grooves (3) communicating with the outside; a first spaced connection layer (31) is arranged between the exhaust grooves (3) and the steel lining (1) to guide the exhaust air. The grouting pipe (4) comprises an outer sleeve pipe (41) and an inner core (42) through which the slurry flows during grouting. The outer sleeve pipe (41) has a through wall outer slurry outlet hole (44), and the inner core (42) has a through wall inner slurry outlet hole (43); the outer slurry outlet hole (44) and the inner slurry outlet hole (43) are staggered and distributed at non-coincident positions, and the outer sleeve pipe (41) has an elastic property of expansion to form a one-way outer isolation part for the slurry, so that the grouting pipe (4) can be repeatedly grouted. The grouting pipe (4) extends along the circumferential direction of the steel lining (1) and is arranged in parallel along the axial direction of the steel lining (1). The steel lining (1) is provided with a grouting groove (2) surrounding the grouting pipe (4), and the outer surface of the grouting groove (2) is fixedly connected with the concrete; a second spaced connection layer (21) is arranged between the grouting groove (2) and the bottom plate of the steel lining (1) to guide the discharge of the slurry. The grouting pipe line (5) is provided with a plurality of guide pipes, and the plurality of guide pipes are connected in parallel with the plurality of grouting pipes (4); the guide pipes comprise a slurry inlet pipe (51) and a slurry return pipe (52) communicating with each other, the slurry inlet pipe (51) communicates with the inner core (42) of the grouting pipe (4), and the slurry return pipe (52) leads to the back of the dam or the gallery for discharging the slurry. The air exhaust grouting pipe line (6) is provided with an air exhaust slurry return pipe (61) cooperating with the grouting pipe line (5), and the air exhaust slurry return pipe (61) leads to the back of the dam or the gallery for discharging the air and the slurry. The steel lining pipe joints (14) are arranged between the adjacent steel linings (1) in the grouting subareas (7) to connect the adjacent steel linings (1).

2. A regroutable steel-lined contact grouting system according to claim 1, characterized in that: The steel lining (1) is provided with exhaust and vibration holes (13) communicating with the concrete contact surface.

3. A regroutable steel liner contact grouting system according to claim 1, characterized in that: The overall contact grouting area is connected in series along the axial direction of the steel lining (1) to realize overall and comprehensive contact grouting.

4. A regroutable steel liner contact grouting system according to claim 1, characterized in that:

6. A repeatable grouting steel lining contact grouting construction method, which uses the repeatable grouting steel lining contact grouting system according to any one of claims 1-5 to perform grouting and repeatable grouting construction, characterized in that:

5. A regroutable steel liner contact grouting system according to claim 1, characterized in that: ​ ​ S1: The grouting system installation: the repeatable grouting grouting pipe (4) is fixed on the surface of the steel lining (1) with the grouting tank (2); the grouting partition (7) is adjusted according to the actual pouring situation on site, and the grouting pipeline (5) and the exhaust backfill pipeline (6) are concentrated to the downstream dam surface or the nearby corridor; S2: Contact grouting construction: the steel lining (1) contact grouting requires that the concrete cooling of the steel lining (1) bottom part is completed after the second stage, and it is carried out in low temperature period; Before grouting, pre-grouting inspection should be done, including pipeline connection, pipeline unobstructed, and steel lining (1) void condition; During grouting, the steel lining (1) is knocked and vibrated with hammer to facilitate suction and air exhaust; when grouting, grouting starts from one side, and after the other side exhausts the air in the pipe and discharges the slurry, it is blocked at this time, the slurry will flow out of the grouting pipe (4) and inject into the gap, and the air in the gap will be discharged from the pre-embedded exhaust groove (3); Grouting of different grouting partitions (7) should be carried out from low to high in turn, and should be started from the downstream side of the grouting partition (7) and gradually pushed to the upstream side of the grouting partition (7); under the specified pressure, the maximum concentration slurry stops suction, and continues to grout for 5 minutes, which ends the grouting; When the exhaust groove exhausts or discharges the slurry, reverse grouting is carried out immediately after the second order grouting is completed; S3: Grouting quality inspection: grouting quality inspection is carried out 7 days after grouting, and the void range and degree should meet the design requirements, and the void after grouting inspection should be repeated grouting by using the pre-embedded grouting pipe (4).

7. A repeatable grouting method of steel lining contact grouting according to claim 6, characterized in that: During grouting quality inspection, drilling grouting should be used for the parts that cannot be grouted by repeated grouting; each independent void area should be drilled no less than 2, and the lowest and highest parts should be drilled; Grouting should start from the low place, and the steel lining (1) should be knocked and vibrated during grouting, the grouting pressure in the large area void area is controlled at 0.1MPa, the independent void area is controlled at 0.15MPa, the maximum concentration slurry stops suction, and continues to grout for 5 minutes, which ends; After grouting, the hole is sealed by welding, and the hole is ground after welding.

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