Basement sump water seepage plugging construction method
Through the methods of counterpressure sand filling, drilling and grouting of steel casings, the leakage problem caused by the silt pipe surge in the basement water collection pit is solved, and the leakage plugging effect is significantly improved and cost and time savings are achieved. .
Patent Information
- Application Number
- CN202411345723.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2024-12-20
AI Technical Summary
The existing technology cannot effectively solve the leakage problem caused by the silt pipe surge in the basement water collection pit, resulting in unsuccessful leakage plugging.
By using the methods of counter-pressure sand filling, drilling and grouting of the holes, the cofferdam is set up around the water collection pit, the drilling and grouting solidification slurry is used to seal the leakage point, and anchor reinforcement is implanted on the well wall. and poured micro-expanded concrete for reinforcement.
It effectively reduces the water pressure and seepage, significantly improves the leakage plugging effect, avoids damage to the basement floor structure, is low in cost, and greatly saves time and costs.
Smart Images
Figure CN119163075A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of building construction, and in particular to a construction method for plugging water seepage in a basement sump. Background Art
[0002] During the flood season of the Yangtze River, seepage will occur in the water collection pits in the basements of coastal projects, accompanied by the outflow of a large amount of quicksand, making rescue operations difficult. By adding a water pump to pump out the water, and inserting a diversion pipe at the leak, the leakage was treated unsuccessfully after the leakage was blocked and drained. Chinese patent "A water collection pit leakage blocking device and water collection pit leakage blocking method", application number: CN202010166197.1, which discloses that the water pressure generated by groundwater infiltration and upwelling is effectively resisted by a blocking groove; and a waterproof wall with a blocking side plate embedded in it is set on the inner wall of the water collection pit, combined with the setting of the blocking groove to permanently control the leakage of the bottom plate and side wall of the water collection pit, thereby avoiding repeated repairs of the leakage. However, its technical solution cannot solve the problem of plugging caused by the silt pipe burst in the lower part of the water collection well. Similarly, the Chinese patent "A basement floor leakage treatment device and basement floor leakage treatment method", application number: CN202010214094.8, discloses that the leakage water of the basement floor is dredged to the water collection well or pipe trench through the trench excavated along the leakage point on the basement floor to avoid repeated leakage points. The leakage points of the basement floor are mostly weak parts of the basement floor. The dredging method of setting trenches can introduce leakage water from other parts to ensure the dryness of a large area of the basement floor. However, its technical solution also cannot solve the problem of plugging caused by sediment pipe bursts in the lower part of the water collection well. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a construction method for plugging water seepage in a basement sump in view of the above-mentioned problems.
[0004] The embodiment of the present application is implemented as follows:
[0005] The present application provides a basement sump seepage plugging construction method, which is characterized by comprising the following steps:
[0006] Step 1: First fill the water collection pit, set up inner and outer cofferdams around the water collection pit, and fill the cofferdam with sand as the cofferdam is constructed until there is no water or sand overflow on the top of the cofferdam, and drain the water at the same time;
[0007] Step 2: According to the actual water leakage situation on site, drilling and grouting are carried out near the concentrated water outlet points or the parts with large-area leakage;
[0008] Step 3: After grouting around the sump, the seepage points of the sump are blocked by the solidified slurry, and the remaining cofferdams are gradually removed, and the sump is cleaned to the bottom. If there is still seepage at the seepage point, the water is diverted out of the pit with a drainage pipe, and the drainage pipe is blocked with a leak-proof king around it;
[0009] Step 4: First, roughen the walls around the well and implant anchor steel bars around them. Then, install the pre-processed steel casing into the well and reinforce it. Then, pour self-compacting micro-expansive concrete between the steel casing and the original sump. When the concrete reaches the designed strength, grout the drainage pipe.
[0010] In some optional implementation schemes, step one specifically includes the following contents:
[0011] First, throw a layer of sandbags into the sump, then spread two layers of bentonite, and then continue to spread sandbags to the pit mouth, add a first-level cofferdam of sandbags around the pit mouth, and fill the first-level cofferdam with yellow sand. If the seepage water is still very turbid at this time, in order to ensure the safety of the first-level cofferdam, on-site personnel will build a second-level cofferdam around the first-level cofferdam, and lay geotextiles in the second-level cofferdam, fill it with yellow sand, and further raise the first-level cofferdam until there is no water or sand overflow on the top of the cofferdam.
[0012] In some optional implementation schemes, step 2 specifically includes the following contents:
[0013] Use professional drilling equipment to drill grouting holes with a depth of 6 to 8 meters. The plugging grouting holes are arranged on the bottom plate on the seepage side of the sump. The hole spacing and row spacing are both 0.5m, with a total of two rows. Then fill the grouting pipes, and complete the drilling and grouting operations of the first row of grouting holes one by one. According to the grouting pressure, grouting volume and plugging situation of the first row, complete the drilling and grouting operations of the second row one by one. The grouting is injected from bottom to top with double-liquid cement slurry for sealing.
[0014] In some optional implementation schemes, the drilling and grouting pipe landfill specifically includes the following contents:
[0015] The secondary cofferdam was removed layer by layer to the basement floor, and sandbags were used to drain the seepage water to the drainage ditch and sump, and the slurry ratio and setting time were determined through on-site experiments;
[0016] The grouting pipe holes are marked with red paint on the working surface according to the hole spacing. A drilling machine is used to drill holes in the bottom plate on the seepage side. An electric pick is used to push the processed grouting pipe into the formation for 6 to 8 meters, with 10 to 20 cm of the grouting pipe exposed. After the grouting pipe is laid, cotton yarn and quick-setting cement mortar are used to seal the area around the grouting pipe to avoid grouting during grouting construction.
[0017] In some optional implementation schemes, the grouting operation specifically includes the following contents:
[0018] The equipment was assembled and debugged, the grouting pipe was connected in a Y-shape, two slurries were mixed in separate tanks, and two pumps were used to grout respectively; the drill was drilled near the leaking point, and after the drill rig drilled in, single-liquid cement slurry was injected to find the leaking channel. The grouting depth was 6 to 8 meters below the basement negative second floor floor. The grouting was gradually applied from the leaking point to both sides, from the inside to the outside. The goal in the early stage was to control leakage, and the goal in the later stage was to reinforce;
[0019] After finding the leaking point, open the water glass slurry valve and start the pump at the same time. The two slurries are mixed in the drill pipe, and the initial setting time of the slurry is 30s. When plugging the leak, the grouting pressure is 0.5-1MPa, and the two grouting pumps inject at the same pump pressure. When viscous slurry appears at the water outlet accompanied by bubbles, the orifice is blocked with a cloth. When the water flow gradually decreases until it stops, stop grouting, observe for 1h, and then continue grouting until the orifice returns to slurry.
[0020] After grouting is completed, close the grouting pump and grouting valve at the same time, clean the grouting pump and pipeline with clean water, and inject enough grout to plug the leaking point and prevent grouting from returning from the hole. After 24 hours, perform static pressure grouting reinforcement. Drill the reinforcement grouting hole 1m below the leak plugging hole and inject grouting. The grouting pressure during reinforcement should be above 0.5-1.5MPa.
[0021] In some optional implementation schemes, the drainage described in step one is simultaneously tested for sand content, and if the sand content exceeds the standard, anti-filtration measures are added.
[0022] In some optional embodiments, the primary cofferdam is higher than the secondary cofferdam.
[0023] In some optional implementation schemes, the steel casing is a rectangular cylinder structure, and a plurality of bolts are evenly spaced on the outer wall surface of the steel casing.
[0024] The beneficial effects of the present application are as follows: the present application provides a method for plugging water seepage in a basement sump, which is adopted in an environment where the water pressure and seepage volume at the seepage point are reduced after the groundwater level drops, and the back pressure effect of the cofferdam is combined to prevent water and sand overflow on the top of the cofferdam, with low cost and significant water stopping and rescue effect; the method of drilling and grouting is adopted near the concentrated water outlet point or the part with large-area leakage to fill the voids caused by sand gushing without destroying the basement floor structure, which is time-saving and low-cost; anchor steel bars are implanted around the well wall, the steel casing is installed in the well and reinforced firmly, and at the same time, self-compacting micro-expansive concrete is filled to reinforce the inside of the sump to prevent sudden damage from underground pressurized water. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0026] Figure 1 This is a schematic diagram of the structure of a two-stage cofferdam according to an embodiment of the present application;
[0027] Figure 2 This is a grouting hole arrangement diagram of an embodiment of the present application;
[0028] Figure 3 This is a grouting construction process flow chart of an embodiment of the present application;
[0029] Figure 4 This is a schematic diagram of a steel casing embedded in a sump according to an embodiment of the present application. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0033] The features and performance of the present application are further described in detail below in conjunction with the embodiments.
[0034] Take the seepage phenomenon in the water collection pit (2m*1.5m, 4.1m deep) of the Yangtze River Coast Project, accompanied by a large amount of quicksand gushing out. Considering that the groundwater level is higher than the basement negative second floor all year round, this seepage plugging operation can only be carried out in an environment where the water pressure and seepage volume at the seepage point are reduced after the groundwater level drops, combined with the back pressure of the cofferdam.
[0035] Implementation plan and workflow:
[0036] 1. If Figure 1 As shown, first throw a layer of sandbags 2 (about 0.5m high) in the sump 1, then lay two layers of bentonite 3 (about 1.0m high), and then continue to lay sandbags to the wellhead (about 3.5m high). Add a sandbag first-level cofferdam 4 around the pit mouth, fill the first-level cofferdam with yellow sand 5 until the first-level cofferdam is filled to about 2 meters high. At this time, the seepage water is still very turbid. To ensure the safety of the first-level cofferdam, the on-site personnel add a second-level cofferdam 6 (about 3m wide and 1m high) around the first-level cofferdam, and lay geotextiles in the second-level cofferdam and fill it with yellow sand. At the same time, further raise the first-level cofferdam (about 3 meters high) until there is no water or sand on the top of the cofferdam. At the same time, organized drainage is carried out, and the sand content of the drainage should be tested. If the sand content exceeds the standard, anti-filtration measures should be added.
[0037] 2. According to the actual leakage situation on site, the drilling and grouting method is used near the concentrated water outlet or the parts with large-area leakage. Use professional drilling equipment to drill the grouting hole 7 with a diameter of 40mm and a hole depth of 6-8m. The plugging grouting holes are arranged on the bottom plate on the side of the water collection well. The hole spacing and row spacing are both 0.5m, with a total of two rows (see Figure 2 ), first complete the drilling and grouting of the first row of grouting holes one by one, and then complete the drilling and grouting of the second row of grouting holes one by one according to the grouting pressure, grouting volume and plugging situation of the first row (see Figure 3 ) Grouting: Inject double-liquid cement slurry from bottom to top for sealing.
[0038] 3. Preparation for leak plugging
[0039] ① Observe the water level of the Han River and the groundwater level of the project. When the water level of the Han River is 24m (Wusong elevation) or below and the groundwater level is 22m (Yellow Sea elevation) or below, start plugging operations.
[0040] ② Remove the secondary cofferdam layer by layer to the basement floor, and use sandbags to drain the seepage water to the drainage ditch and collection well.
[0041] ③ Determine parameters such as slurry ratio and setting time through on-site experiments.
[0042] 4. Grouting pipe laying
[0043] ① Mark the grouting pipe hole positions on the working surface with red paint according to the hole spacing.
[0044] ② Use a drilling machine to drill holes in the bottom plate on the seepage side.
[0045] ③ Use an electric pick to push the processed grouting pipe into the formation 6m to 8m, with 10-20cm of the grouting pipe exposed.
[0046] ④ After the grouting pipe is laid, use cotton yarn + quick-setting cement mortar to seal the area around the grouting pipe to avoid grouting during grouting construction.
[0047] ⑤After grouting of one grouting hole is completed, drill and grout the next part.
[0048] 5. Grouting operation
[0049] ① The equipment is assembled and debugged, the grouting pipe is connected in Y shape, the two slurries are mixed in separate tanks, and two pumps are used to grout separately.
[0050] ②Hole layout: Drill near the leaking point, and inject single-liquid cement slurry after the drill rig drills in to find the leaking channel; the grouting depth is about 6m to 8m below the bottom slab of the second negative floor of the basement. The grouting is gradually applied from the vicinity of the leaking point to both sides, and from the inside to the outside. The goal in the early stage is to control leakage, and the goal in the later stage is to reinforce.
[0051] ③ After finding the leaking point, open the water glass slurry valve and start the pump at the same time. The two slurries will mix in the drill pipe. The initial setting time of the slurry is about 30s.
[0052] ④ When plugging leaks, the grouting pressure is between 0.5 and 1 MPa, and the two grouting pumps inject at the same pump pressure.
[0053] ⑤ When viscous slurry appears at the water outlet accompanied by bubbles, plug the hole with a piece of cloth, and stop grouting when the water flow gradually decreases until it stops. Continue grouting after observing for 1 hour until slurry returns to the hole.
[0054] ⑥ After the grouting is completed, close the grouting pump and grouting valve at the same time, and clean the grouting pump and pipeline with clean water.
[0055] ⑦ Grouting inspection: The amount of grouting is to plug the leaking point and the hole mouth. After 24 hours, static pressure grouting reinforcement is carried out. The reinforcement grouting hole is drilled 1m away from the plugging hole and the grouting pressure during reinforcement is above 0.5-1.5MPa.
[0056] 6. After grouting around the sump, the seepage points in the sump are blocked by the solidified slurry, and the remaining cofferdams are gradually removed and the sump is cleaned to the bottom. If there is still a small amount of seepage at the seepage point, use a drainage pipe to divert the water out of the well, and use a leak-proof king to block the drainage pipe.
[0057] 7. First, roughen the well wall and implant anchor steel bars 8 around the well wall. Then install the pre-processed steel casing 9 into the well and reinforce it. Multiple bolts 10 are evenly spaced on the outer wall of the steel casing. Then, pour C35 self-compacting micro-expansive concrete 11 (see Figure 4 ), wait until the concrete reaches the designed strength, and finally grouting and sealing the drainage pipe.
Claims
1. A basement sump seepage plugging construction method, characterized in that: The steps include: Step 1: First fill the water collection pit, set up inner and outer cofferdams around the water collection pit, and fill the cofferdam with sand as the cofferdam is constructed until there is no water or sand overflow on the top of the cofferdam, and drain the water at the same time; Step 2: According to the actual water leakage situation on site, drilling and grouting are carried out near the concentrated water outlet points or the parts with large-area leakage; Step 3: After grouting around the sump, the seepage points of the sump are blocked by the solidified slurry, and the remaining cofferdams are gradually removed, and the sump is cleaned to the bottom. If there is still seepage at the seepage point, the water is diverted out of the pit with a drainage pipe, and the drainage pipe is blocked with a leak-proof king around it; Step 4: First, roughen the walls around the well and implant anchor steel bars around them. Then, install the pre-processed steel casing into the well and reinforce it. Then, pour self-compacting micro-expansive concrete between the steel casing and the original sump. When the concrete reaches the designed strength, grout the drainage pipe.
2. A basement sump seepage plugging construction method according to claim 1, characterized in that: Step 1 specifically includes the following: First, throw a layer of sandbags into the sump, then spread two layers of bentonite, and then continue to spread sandbags to the pit mouth, add a first-level cofferdam of sandbags around the pit mouth, and fill the first-level cofferdam with yellow sand. If the seepage water is still very turbid at this time, in order to ensure the safety of the first-level cofferdam, on-site personnel will build a second-level cofferdam around the first-level cofferdam, and lay geotextiles in the second-level cofferdam, fill it with yellow sand, and further raise the first-level cofferdam until there is no water or sand overflow on the top of the cofferdam.
3. A basement sump seepage plugging construction method according to claim 2, characterized in that: Step 2 specifically includes the following: Use professional drilling equipment to drill grouting holes with a depth of 6 to 8 meters. The plugging grouting holes are arranged on the bottom plate on the seepage side of the sump. The hole spacing and row spacing are both 0.5m, with a total of two rows. Then fill the grouting pipes, and complete the drilling and grouting operations of the first row of grouting holes one by one. According to the grouting pressure, grouting volume and plugging situation of the first row, complete the drilling and grouting operations of the second row one by one. The grouting is injected from bottom to top with double-liquid cement slurry for sealing.
4. A basement sump seepage plugging construction method according to claim 3, characterized in that: The drilling and grouting pipe landfill specifically includes the following contents: The secondary cofferdam was removed layer by layer to the basement floor, and sandbags were used to drain the seepage water to the drainage ditch and sump, and the slurry ratio and setting time were determined through on-site experiments; The grouting pipe holes are marked with red paint on the working surface according to the hole spacing. A drilling machine is used to drill holes in the bottom plate on the seepage side. An electric pick is used to push the processed grouting pipe into the formation for 6 to 8 meters, with 10 to 20 cm of the grouting pipe exposed. After the grouting pipe is laid, cotton yarn and quick-setting cement mortar are used to seal the area around the grouting pipe to avoid grouting during grouting construction.
5. A basement sump seepage plugging construction method according to claim 3 or 4, characterized in that: The grouting operation specifically includes the following contents: The equipment was assembled and debugged, the grouting pipe was connected in a Y-shape, two slurries were mixed in separate tanks, and two pumps were used to grout respectively; the drill was drilled near the leaking point, and after the drill rig drilled in, single-liquid cement slurry was injected to find the leaking channel. The grouting depth was 6 to 8 meters below the basement negative second floor floor. The grouting was gradually applied from the leaking point to both sides, from the inside to the outside. The goal in the early stage was to control leakage, and the goal in the later stage was to reinforce; After finding the leaking point, open the water glass slurry valve and start the pump at the same time. The two slurries are mixed in the drill pipe, and the initial setting time of the slurry is 30s. When plugging the leak, the grouting pressure is 0.5-1MPa, and the two grouting pumps inject at the same pump pressure. When viscous slurry appears at the water outlet accompanied by bubbles, the orifice is blocked with a cloth. When the water flow gradually decreases until it stops, stop grouting, observe for 1h, and then continue grouting until the orifice returns to slurry. After grouting is completed, close the grouting pump and grouting valve at the same time, clean the grouting pump and pipeline with clean water, and inject enough grout to plug the leaking point and prevent grouting from returning from the hole. After 24 hours, perform static pressure grouting reinforcement. Drill the reinforcement grouting hole 1m below the leak plugging hole and inject grouting. The grouting pressure during reinforcement should be above 0.5-1.5MPa.
6. A basement sump seepage plugging construction method according to claim 5, characterized in that: The drainage described in step 1 is simultaneously tested for sand content, and if the sand content exceeds the standard, additional anti-filtration measures are added.
7. A basement sump seepage plugging construction method according to claim 2 or 6, characterized in that: The first-level cofferdam is higher than the second-level cofferdam.
8. A basement sump seepage plugging construction method according to claim 1 or 6, characterized in that: The steel casing is a rectangular cylinder structure, and a plurality of bolts are evenly spaced on the outer wall surface of the steel casing.