Construction method for repairing existing waterproof plate based on grouting process

Abstract

The invention relates to the technical field of waterproof layer repairing, and discloses a construction method for repairing an existing waterproof plate based on a grouting technology, and the construction method comprises the following steps: detecting a leakage area, and determining the damage condition of the waterproof plate; according to the damage condition of the waterproof plate, a grouting scheme is formulated; according to the grouting scheme, grouting plugging is conducted on construction joints on the two sides of the damaged position of the emergency repair area, and therefore the water leakage position in the lining plate is preliminarily plugged; after the construction joints are blocked, the lining plate between the two construction joints is punched, and grouting pipes are embedded; grouting is conducted on the grouting pipes in sequence from bottom to top, grout overflowing from the adjacent grouting pipes is observed, and after grouting is completed, grout outlets are blocked, and pressurization and pressure maintaining are conducted till the grout is solidified; after curing of all the grout is completed, the cured grout is detected, the technical problems that the waterproof effect is poor, the waterproof validity period is short, and construction time exists are solved, and the technical effects of being good in waterproof effect, long in waterproof validity period and short in construction time are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waterproof layer repair, in particular to a construction method for repairing existing waterproof plates based on a grouting process. BACKGROUND

[0002] Since the 21st century, with the continuous expansion of tunnel construction scale, the construction of large-area and multiple types of tunnels has increased, and the leakage problem that was not fully exposed in previous engineering practices has gradually emerged and become a prominent hidden danger affecting the safety of tunnel structure and the operational efficiency. The main reasons for the leakage problem are the service life of the waterproof plate and the mismatch between the relaxation coefficient of the waterproof plate and the flatness of the primary support. Poor construction quality can easily cause problems such as water capsule formation and cracking under the extrusion of secondary lining concrete, forming drainage channels. The repair of the waterproof plate behind the secondary lining is much more difficult than the repair of the waterproof plate during the construction phase. The damaged location, shape, and range cannot be directly observed due to the coverage of the secondary lining, and the repair process may cause local damage to the secondary lining. The traditional waterproof plate damage repair usually uses the grouting plugging method for water outlets and cracks, which has a long construction period, high cost, and short warranty period.

[0003] Existing grouting repair techniques, such as tunnel waterproof plate void grouting, are mainly aimed at local voids, water outlets, or cracks, and are difficult to form a continuous and complete waterproof plate structure. There are problems such as uneven diffusion of grout and insufficient adhesion, resulting in poor waterproof effect and short waterproof effective period. For large-area waterproof plate damage, the existing structure needs to be removed for waterproof layer repair, which requires large-area removal of existing structures and has a long construction time. SUMMARY

[0004] The purpose of the present application is to provide a construction method for repairing existing waterproof plates based on a grouting process to solve the technical problems of poor waterproof effect, short waterproof effective period, and long construction time.

[0005] To solve the above technical problems, the present application provides a construction method for repairing existing waterproof plates based on a grouting process, comprising the following steps:

[0006] Detecting the leakage area to determine the damage condition of the waterproof plate;

[0007] Developing a grouting scheme according to the damage condition of the waterproof plate;

[0008] According to the grouting scheme, grouting and plugging are performed on the construction joints on both sides of the damaged area of the emergency repair area;

[0009] After the construction joints are plugged, the lining plate between the two construction joints is perforated, and a grouting pipe is embedded;

[0010] The grouting pipe is started to grout from low to high, and the grout overflowed from the adjacent grouting pipe is observed, after the grouting is completed, the grout outlet is blocked, and the pressure is increased and maintained until the grout is solidified;

[0011] After the solidification of all the grout is completed, the solidified grout is detected.

[0012] In an optional embodiment, the step of detecting the leakage area comprises:

[0013] The damaged position of the waterproof plate, the void range and the leakage channel are determined by a non-destructive testing method.

[0014] In an optional embodiment, the grouting scheme comprises:

[0015] The water film thickness of the water seepage is less than 1mm and no flow is set as a general repair area;

[0016] The water film thickness of the water seepage is less than 1mm and the flow is set as an emergency repair area;

[0017] The water film thickness of the water seepage is greater than or equal to 1mm and is set as an emergency repair area;

[0018] The general repair area is perforated and grouted to block.

[0019] In an optional embodiment, the grouting and blocking of the construction joint comprises:

[0020] Holes are sequentially punched along the length direction of the construction joint, a grouting pipe is embedded in each hole, and grouting and blocking are sequentially performed from low to high.

[0021] In an optional embodiment, when two adjacent construction joints are blocked, they are sequentially grouted from low to high at the same time.

[0022] In an optional embodiment, the observation of the grout overflowed from the adjacent grouting pipe comprises:

[0023] When the grout concentration of the grout outlet is the same as the grout concentration of the injected grout, the grout outlet is blocked, the grout injection is continued to increase the pressure, and then the grouting is stopped to maintain the pressure, so that the internal grout is compacted.

[0024] In an optional embodiment, the step of perforating the liner plate comprises:

[0025] A plurality of holes are punched along the surface of the liner plate, the distance between adjacent two holes is 500mm to 1000mm, and the plurality of holes are arranged in a plum blossom shape.

[0026] In an optional embodiment, the step of starting grouting of the grouting pipe comprises:

[0027] First, multiple holes at the same height on the lining plate are grouted, and a hole is left between adjacent grouted holes as a grout outlet. After the grout concentration of the grout outlet is equal to the grouted grout concentration, the grout outlet is blocked and pressure is applied and maintained.

[0028] In an optional embodiment, the step of starting grouting of the grouting pipe further comprises:

[0029] Multiple holes on the lining plate are grouted one by one.

[0030] After the first hole is grouted, the second adjacent hole starts to flow grout and the concentration is the same as the inflowing grout, and then the first hole is blocked and the second hole is continuously pressurized, so that the grout concentration at the first hole increases and the third hole discharges water and grout. Repeat this step to complete grouting of all holes.

[0031] In an optional embodiment, the step of starting grouting of the grouting pipe further comprises:

[0032] For the arc-shaped lining plate with holes, the two sides of the lining plate are grouted synchronously, and after the first layer of grouting is completed, the two sides are grouted synchronously upwards in a cycle until all the holes on the lining plate are grouted.

[0033] The application provides a construction method for repairing an existing waterproof plate based on a grouting process, which comprises the following steps: detecting a leakage area to determine the damage condition of the waterproof plate; formulating a grouting scheme according to the damage condition of the waterproof plate; grouting and blocking the construction joints on both sides of the damaged part of the emergency repair area according to the grouting scheme, so as to preliminarily block the water leakage in the lining plate; after the construction joints are blocked, the lining plate between the two construction joints is perforated and a grouting pipe is embedded; the grouting pipe is sequentially started from the bottom to the top, and the overflowed grout of the adjacent grouting pipe is observed; after grouting is completed, the grout outlet is blocked, and pressure is applied and maintained until the grout solidifies; after all the grout solidifies, the solidified grout is detected, thereby solving the technical problems of poor waterproof effect, short waterproof effective period and long construction time, and achieving the technical effects of good waterproof effect, long waterproof effective period and short construction time. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a structure diagram for repairing an existing waterproof plate by using the grouting process in the embodiments of the application.

[0035] Figure 2 It is a cross-sectional structure diagram of the existing waterproof structure mentioned in the embodiments of the application.

[0036] In the figure, 1 is a waterproof plate; 2 is a lining plate; 3 is a hole; and 4 is a construction joint. DETAILED DESCRIPTION

[0037] The specific embodiments of the present application will be further described in detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0038] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the related art, the grouting repair technology is mostly aimed at local void or crack, and it is difficult to form a continuous and complete waterproof plate structure, and there are problems such as uneven diffusion of slurry, insufficient adhesion, etc. In the face of large-area waterproof plate damage, the lining plate generally needs to be removed for repairing the waterproof layer, and the existing structure needs to be removed in a large area, and the construction is interrupted for a long time.

[0040] Therefore, as shown in Figure 1 and Figure 2 Some embodiments of the present application provide a construction method for repairing an existing waterproof plate 1 based on a grouting process, comprising the following steps: detecting the leakage area to determine the damage condition of the waterproof plate 1; according to the damage condition of the waterproof plate 1, a grouting scheme is formulated; according to the grouting scheme, the construction joints 4 on both sides of the damaged part of the emergency repair area are grouted and blocked; after the construction joints 4 are blocked, the lining plate 2 between the two construction joints 4 is perforated, and the grouting pipe is embedded; the grouting pipe is grouted from bottom to top in sequence, and the overflowed slurry of the adjacent grouting pipe is observed, after the grouting is completed, the slurry outlet is blocked, and the pressure and pressure retention are carried out until the slurry is solidified; after the solidification of all the slurry is completed, the solidified slurry is detected.

[0041] In the above embodiment, after leakage occurs, first, the relative lining plate 2 of the leakage area can be detected by a geological radar to determine the leakage area inside the lining plate 2, the damage of the waterproof plate 1 is determined according to the leakage scale of the leakage area, then a corresponding grouting scheme is formulated, and according to the formulated grouting scheme, the nearest construction joint 4 on both sides of the emergency repair area is determined, and the construction joint 4 is grouted and plugged, the waterproof layer on the back of the lining plate 2 is preliminarily repaired through grouting and plugging, further, after grouting and solidification in the construction joint 4, the lining plate 2 between the two construction joints 4 is perforated, the perforation direction can be perpendicular to the surface of the lining plate 2, then the grouting pipe is buried in the perforation, one end of the grouting pipe reaches the waterproof layer to be repaired, and the other end can be flush with the opening of the hole 3 or protrude from the hole 3, the grouting pipe is connected to the opening of the hole 3 or the end surface of the grouting pipe, the grouting pipe can grout the waterproof layer through the grouting pipe, and the grouting is sequentially performed from bottom to top, the grouting outlet is observed, and the grouting outlet is plugged at an appropriate time, so as to increase the pressure of the internal grout, and the grouting can be pressurized and pressure maintained in the process, so that the internal grout is more compact, and after the grouting solidifies, the lining plate 2 can be detected again by a geological radar to ensure the repair condition.

[0042] Some embodiments of the present application provide a construction method for repairing an existing waterproof plate 1 based on a grouting process, including the following steps: detecting a leakage area to determine the damage of the waterproof plate 1; formulating a grouting scheme according to the damage of the waterproof plate 1; plugging the construction joint 4 on both sides of the damaged part of the emergency repair area through grouting according to the grouting scheme, so as to preliminarily plug the water leakage in the lining plate 2; perforating the lining plate 2 between the two construction joints 4 after the construction joint 4 is plugged, and burying a grouting pipe; sequentially grouting the grouting pipe from bottom to top, and observing the grout overflowed from the adjacent grouting pipe, after the grouting is completed, the grouting outlet is plugged, and pressurization and pressure maintenance are performed until the grout solidifies; after all the grout solidifies, the solidified grout is detected, which solves the technical problems of long construction interruption time and large-area demolition of existing structures, and achieves the technical effects of short construction time and no need for large-area demolition.

[0043] In the optional embodiment, the step of detecting the leakage area includes determining the damage position, void range and leakage channel of the waterproof plate 1 by a non-destructive testing method.

[0044] In the above embodiment, the detection method can adopt non-contact detection, and the detection can adopt a detection method such as a geological radar or infrared thermal imaging, and the obtained structure includes a waterproof plate 1 damage area, a waterproof plate 1 damage margin, a water layer margin, a void range and a cautious channel, so that different grouting schemes can be formulated according to the scale of water seepage, and different diameters of holes 3 and different spacings of holes 3 are matched.

[0045] In an optional embodiment, the grouting scheme includes: setting the water seepage water film thickness <1mm and no flow as a general repair area; setting the water seepage water film thickness <1mm and flow as an emergency repair area; setting the water seepage water film thickness ≥1mm as an emergency repair area; punching and grouting sealing for the general repair area.

[0046] In the above embodiment, according to the detection result of the leakage area, the water seepage water film thickness and whether it flows are determined, wherein the water seepage water film thickness less than 1mm and no flow is divided into a general repair area, this area is not active and has little impact, and can use general repair method, without emergency repair, so it can use punching and direct grouting method for sealing.

[0047] The water seepage water film thickness less than 1mm and flow, and the water seepage water film thickness greater than or equal to 1mm regardless of whether it flows are set as an emergency repair area. For the emergency repair area, the repair method mentioned above is used.

[0048] In an optional embodiment, the grouting sealing of the construction joint 4 includes: punching along the length direction of the construction joint 4 in sequence, embedding a grouting pipe in each hole, and grouting sealing from low to high in sequence.

[0049] In the above embodiment, during the process of sealing the construction joint 4, because the construction joint 4 is arranged on the inner wall of the arch-shaped tunnel, the construction joint 4 can be inverted U-shaped, and multiple construction joints 4 are arranged at intervals along the length direction of the tunnel. The punching and grouting are performed on the two construction joints 4 closest to the two sides of the emergency repair area. Multiple holes 3 are arranged on each construction joint 4. Generally, the entire construction joint 4 needs to be punched. When grouting, the grouting is preferentially performed on the lower holes 3. After the grouting of the lower holes 3 is completed, the grouting is performed on the upper holes 3. The grouting is sequentially performed to complete the preliminary sealing of the waterproof layer.

[0050] In an optional embodiment, when the two adjacent construction joints 4 are sealed, the grouting is sequentially performed from low to high at the same time.

[0051] In the above embodiment, when the two construction joints 4 are sealed, the two construction joints 4 are operated synchronously, that is, the four low points of the two construction joints 4 are grouted synchronously, and the grouting of the next hole 3 is also performed synchronously, so as to complete the grouting work of all the holes 3 of the two construction joints 4, and make the inside of the two construction joints 4 and between the two construction joints 4 more full.

[0052] In an optional embodiment, observing the grout overflowed from the adjacent grouting pipe includes: when the concentration of the grout at the grout outlet is the same as the concentration of the injected grout, plugging the grout outlet, continuously injecting grout under pressure, and then stopping grouting to maintain pressure, so as to make the internal grout compact.

[0053] In the above embodiment, after the slurry is injected, the concentration of the slurry at the slurry outlet is monitored in real time. When the concentration of the slurry at the slurry outlet is equal to the concentration of the injected slurry, the slurry outlet is blocked, and the injection of the slurry is continued for a period of time, so as to pressurize the internal slurry. Then, the injection of the slurry is stopped, and the internal high pressure is maintained for a period of time to solidify the slurry, so that the internal slurry is more compact and has high strength after solidification, and the hole 3 is avoided.

[0054] In an optional embodiment, the step of perforating the liner plate 2 includes perforating a plurality of holes along the surface of the liner plate 2, the distance between adjacent two holes is 500mm-1000mm, and the plurality of holes are arranged in a quincunx shape.

[0055] In the above embodiment, the diameter of each hole 3 can be 14mm, the distance between adjacent two holes 3 can be 500mm-1000mm, each hole 3 is in a cylindrical shape, and each hole 3 penetrates through the liner plate 2 and reaches the waterproof layer, so that the plurality of holes 3 can inject slurry to the waterproof layer, and the water at the waterproof layer can flow out through the holes 3.

[0056] The slurry injection scheme also includes the selection of the slurry injection slurry. The slurry and the injection pressure, pressure maintaining time, etc. are selected according to the soil environment, the damage area, and the site environment adaptability. For example, A / B two-component polyacrylate (A liquid: acrylic monomer, B liquid: crosslinking agent) is injected, the injection pressure is increased by 0.2MPa to 0.4MPa, the combined injection process of "cement slurry + anti-dispersant + clay" can also be used, and the injection pressure is increased by 1MPa to 3MPa.

[0057] In an optional embodiment, the step of starting to inject slurry into the injection pipe includes first injecting slurry into a plurality of hole 3 at the same height on the liner plate 2. A hole 3 is left between adjacent slurry injection holes 3 as a slurry outlet. When the concentration of the slurry at the slurry outlet is equal to the concentration of the injected slurry, the slurry outlet is blocked, and the pressure is increased and maintained.

[0058] In the above embodiment, the slurry injection can be performed in a manner of every other hole. The holes 3 that are spaced apart are selected as slurry injection outlets, and a slurry outlet is left between adjacent slurry injection outlets. In this way, the slurry injection efficiency is improved, and the internal slurry injection is more comprehensive. When the concentration of the slurry at the slurry outlet is equal to the concentration of the injected slurry, the slurry outlet is blocked, and the pressure is increased and maintained until the slurry solidifies, so that the slurry injection is more comprehensive and efficient.

[0059] In the optional embodiment, the step of starting grouting by the grouting pipe further comprises: grouting the plurality of holes 3 on the lining plate 2 one by one; wherein after grouting the first hole 3, the adjacent second hole 3 starts to flow out the slurry and until the concentration is the same as the inflow slurry, then the first hole 3 is blocked and the second hole 3 is continuously pressurized, so that the slurry concentration at the first hole 3 is increased, and the third hole 3 discharges water and slurry, and the step is repeated to complete the grouting of all holes 3.

[0060] In the above embodiment, by the way of grouting one by one, the holes 3 at the lower part are preferentially grouted, and then the grouting is sequentially performed upward, and the plurality of holes 3 at the same height can be grouted in sequence after the holes 3 at the corners are grouted, so that the internal grouting is more comprehensive and thorough.

[0061] In the optional embodiment, the step of starting grouting by the grouting pipe further comprises: for the arc-shaped lining plate 2, the holes 3 are arranged on the lining plate 2, and the two sides of the lining plate 2 are synchronously grouted, after the first layer grouting is completed, the two sides are synchronously grouted upward in cycle until the grouting of the holes 3 on the lining plate 2 is completed.

[0062] In the above embodiment, the lining plate 2 is arc-shaped, and the two sides of the lining plate 2 can be synchronously grouted, so that the grouting efficiency can be improved, and the waterproof layer inside the two sides is more continuous and compact, and the slurry can be filled in each position inside the lining plate 2, so that the repairing effect is better.

[0063] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A construction method for repairing an existing waterproof board based on a grouting process, characterized in that, The method comprises the following steps: detecting the leakage area to determine the damage of the waterproof plate; formulating a grouting scheme according to the damage of the waterproof plate; grouting and sealing the construction joints on both sides of the damaged part of the emergency repair area according to the grouting scheme; punching the lining plate between the two construction joints after the construction joints are sealed, and embedding the grouting pipe; starting grouting from the bottom to the top of the grouting pipe, and observing the overflow of the grout from the adjacent grouting pipe, and after the grouting is completed, the grout outlet is blocked, and the pressure is increased and maintained until the grout is solidified; after the solidification of all the grout is completed, the solidified grout is detected.

2. The construction method for repairing an existing waterproof board based on a grouting process according to claim 1, characterized in that, The step of detecting the leakage area comprises: determining the damage position, void range and leakage channel of the waterproof plate by non-destructive testing means.

3. The construction method for repairing an existing waterproof board based on a grouting process according to claim 1, characterized in that, The grouting scheme comprises: setting the water film thickness of the water seepage <1mm and no flow as a general repair area; setting the water film thickness of the water seepage <1mm and flow as an emergency repair area; setting the water film thickness of the water seepage ≥1mm as an emergency repair area; punching and grouting sealing for the general repair area.

4. The construction method for repairing an existing waterproof board based on a grouting process according to claim 1, characterized in that, The step of grouting and sealing the construction joints comprises: punching along the length direction of the construction joint, embedding the grouting pipe in each hole, and grouting and sealing from low to high.

5. The construction method for repairing an existing waterproof board based on a grouting process according to claim 4, characterized in that, When the two adjacent construction joints are sealed, they are sequentially grouted from low to high at the same time.

6. The construction method for repairing an existing waterproof board based on a grouting process according to claim 1, characterized in that, The step of observing the overflow of the grout from the adjacent grouting pipe comprises: when the concentration of the grout at the grout outlet is the same as the concentration of the injected grout, the grout outlet is blocked, the grout is continuously injected to increase the pressure, and then the grouting is stopped for pressure maintenance, so that the internal grout is compacted.

7. The construction method for repairing an existing waterproof board based on a grouting process according to claim 1, characterized in that, The step of punching the lining plate comprises: punching multiple holes on the surface of the lining plate, the distance between adjacent two holes is 500mm-1000mm, and the multiple holes are arranged in a plum blossom shape.

8. The construction method for repairing an existing waterproof board based on a grouting process according to claim 7, characterized in that, The step of starting grouting for the grouting pipe comprises: first, grouting is performed on multiple holes at the same height on the lining plate, a hole is left between adjacent grouting holes as a grout outlet, and after the concentration of the grout at the grout outlet is equal to the concentration of the injected grout, the grout outlet is blocked and the pressure is increased and maintained. 9.The construction method for repairing an existing waterproof board based on a grouting process according to claim 7, characterized in that, The step of starting grouting for the grouting pipe further comprises: grouting the multiple holes on the lining plate one by one; wherein, after grouting the first hole, the second adjacent hole starts to flow out grout until the concentration is the same as the injected grout, then the first hole is blocked and the pressure is continuously increased through the second hole, so that the concentration of the grout at the first hole increases, and the third hole discharges water and grout, and the step is repeated to complete the grouting of all the holes.

10. The construction method for repairing an existing waterproof board based on a grouting process according to claim 8 or 9, characterized in that, The step of starting grouting for the grouting pipe further comprises: for the arc-shaped lining plate provided with holes on both sides, synchronous grouting is performed on both sides, after the first layer grouting is completed, synchronous upward circulation grouting is performed on both sides until the grouting of all the holes on the lining plate is completed.

Images