Water stop reinforcing structure of foundation pit pressure reduction and precipitation well
By setting up a filter material layer, clay ball layer, grouting layer and concrete layer in the foundation pit precipitation well, and a combined structure of grouting pipe reserved, the problem of water leakage on the side walls of the precipitation well is solved, and a more effective water stop effect is achieved, improving the safety of foundation pit construction and saving costs.
Patent Information
- Application Number
- CN202420609069.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-03-27
AI Technical Summary
In foundation pit construction, water leakage on the side walls of the precipitation well is an important factor that causes instability of the foundation pit. The existing traditional sealing method has limited effect, and there is a problem that the soil fill is not dense and easily leads to leakage channels.
A foundation pit decompression precipitation well water stop reinforcement structure is adopted, which is arranged between the well pipe and the wall of the precipitation well hole, including a filter material layer, a clay ball layer, a grouting layer and a concrete layer, and a reserved grouting pipe. Through the combination of these layers and the compaction and reinforcement of the grouting layer, a more effective water stop effect is achieved.
By adding reinforced units of grouting layer and concrete layer, the possibility of leakage in the side walls of precipitation wells is effectively reduced, static and dynamic water stopping effects are achieved, the safety of foundation pit construction is improved, and cost savings are saved.
Smart Images
Figure CN222632304U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building and municipal construction, and in particular to a water-stopping reinforcement structure for a foundation pit pressure-reducing and dewatering well. Background Art
[0002] In foundation pit construction, dewatering projects are an important part of the process. Wellpoint dewatering is a conventional dewatering method used in existing construction. When there is high-head pressurized water in the foundation pit project, a dewatering well must be set up. During the excavation of the foundation pit, sudden water leakage from the side walls of the dewatering wells in the pit is often one of the important factors leading to the instability of the foundation pit, and any problems on site are catastrophic. Water stopping is generally carried out by backfilling with clay balls. This traditional sealing method has limited effect, and there are problems with loose fill and easy leakage channels. Therefore, how to effectively control the walls of the dewatering wells in the foundation pit to prevent water from bubbling has become an urgent problem to be solved. Utility Model Content
[0003] In order to solve the above problems, the utility model provides a water-stopping reinforcement structure for a foundation pit pressure relief well, which can ensure that the pressure relief well does not surge during foundation pit excavation, improve the safety of foundation pit construction, and save construction costs.
[0004] In order to achieve the above purpose, the specific technical solutions adopted by the utility model are as follows:
[0005] A water-stopping reinforcement structure for a foundation pit pressure-reducing and dewatering well, arranged between a well pipe and a wall of a dewatering well hole; the well pipe comprises a main pipe section and a filter pipe section with filter holes formed on the peripheral wall below the main pipe section; the water-stopping reinforcement structure comprises, from bottom to top, a filled filter material layer, a clay ball layer and at least one reinforcement unit, the reinforcement unit comprises a grouting layer and a concrete layer arranged above the grouting layer; the filter material layer is arranged at a height not lower than the top of the filter pipe section to ensure that the filter material layer covers the filter pipe section.
[0006] The utility model adds a reinforcement unit consisting of a grouting layer and a concrete layer on the basis of clay ball backfill, compacts by setting a grouting layer, and then reinforces by setting a concrete layer, thereby playing a role of water stopping and strengthening, and reducing the possibility of side wall leakage in the precipitation well.
[0007] Preferably, at least one reserved grouting pipe is provided for each grouting layer, and each of the reserved grouting pipes is vertically arranged and the top end passes through the uppermost concrete layer, and the pipe body is provided with a plurality of grouting holes. When cracks or depressions occur in the grouting layer or the concrete layer, which causes the risk of leakage in the precipitation well, grouting through the reserved grouting pipe can fill these defects in the surrounding area, thereby avoiding leakage or even sudden surges between the well pipe and the wellbore wall during the water pumping and pressure reduction process of the precipitation well. During the grouting process, the upper concrete layer plays a role in sealing and preventing the slurry from returning upwards, and the grouting pressure can also be appropriately increased to play a role in sealing the dynamic sudden surges of water or mud.
[0008] Preferably, the outer diameter of the water-stop reinforcement structure is consistent from top to bottom, and the radial width of the clay ball layer, grouting layer and concrete layer is b, a<b. The filter material layer has a thinner width than the clay ball layer, grouting layer and concrete layer, which can reduce the difficulty of water-stopping and improve the sealing effect of its upper structure.
[0009] Preferably, the reinforcement units are provided with two or more, which has a better water-stopping effect.
[0010] The utility model has the following beneficial effects:
[0011] 1. The utility model arranges a grouting layer and a concrete layer above the clay ball layer for compaction and consolidation, waits for the filter material to be backfilled for more than 20 minutes, then backfills the high-quality clay balls, and then after the clay balls have rested, the grouting layer and the concrete layer are interlayered to strengthen water stopping, thereby achieving static water stopping.
[0012] 2. Realize emergency rescue and reinforcement. In dynamic and emergency conditions, reserve grouting pipes to start grouting. During the grouting process, the upper concrete layer plays a role in sealing and preventing the slurry from returning upwards. The grouting pressure can also be appropriately increased to seal dynamic sudden water or mud. In particular, the application of this structure during the lifting of columns or precipitation wells can effectively prevent the development of groundwater sudden accidents.
[0013] 3. By setting up reserved grouting pipes to fill the defects of the grouting layer and the concrete layer, the purpose of strengthening water stopping can be achieved, and sudden leakage of the side wall of the drainage well in the foundation pit can be effectively avoided.
[0014] 4. The utility model reduces the difficulty of water stopping and improves the blocking effect by reducing the radial width of the filter material layer.
[0015] 5. The utility model water-stop reinforcement structure can make the precipitation well obtain an excellent water-stopping effect, effectively improve the safety of foundation pit construction, strengthen emergency remedial work, save foundation pit engineering workload, and save construction costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 : Schematic diagram of the water-stopping reinforcement structure of the foundation pit pressure relief and dewatering well described in Example 1.
[0017] Figure 2 : Schematic diagram of the water-stopping reinforcement structure of the foundation pit pressure relief and dewatering well described in Example 2.
[0018] Figure 3 : Schematic diagram of the water-stopping reinforcement structure of the foundation pit decompression and dewatering well described in Example 3.
[0019] In the figure: 1-well pipe, 2-filter material layer, 3-clay ball layer, 4-grouting layer, 5-concrete layer, 6-reserved grouting pipe; 11-main pipe section, 12-filtration pipe section, 13-sedimentation pipe section, a, b-radial width. DETAILED DESCRIPTION
[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.
[0021] Example 1
[0022] A water-stopping reinforcement structure for a foundation pit pressure relief well, such as Figure 1 As shown, it is arranged between the well pipe 1 and the wall of the drainage well hole, including a filter material layer 2, a clay ball layer 3, a grouting layer 4, a concrete layer 5 and a reserved grouting pipe 6, wherein the grouting layer 4 and the concrete layer 5 form a reinforcement unit. The radial width of the water-stop reinforcement structure is consistent from top to bottom.
[0023] Specifically, the well pipe 1 includes, from top to bottom, a main pipe section 11, a filter pipe section 12 with filter holes on the peripheral wall, and a sedimentation pipe section 13 for settling silt to prevent the filter holes from being blocked. The filter material layer 2, clay ball layer 3, grouting layer 4, and concrete layer 5 are filled from bottom to top between the well pipe 1 and the wall of the precipitation wellbore; the bottom end of the filter material layer 2 is flush with the bottom end of the sedimentation pipe section 13, and the top end is arranged beyond the top end of the filter pipe section 12; the grouting layer 4 is provided with a reserved grouting pipe 6, which is arranged vertically and the top end passes through the concrete layer 5 to expose the pipe mouth for subsequent grouting, and the pipe body of the reserved grouting pipe 6 is provided with a plurality of grouting holes. In this embodiment, the filter material used in the filter material layer 2 is yellow sand and gravel, which are mixed and filled to obtain the filter material layer 2.
[0024] When the pressure-reducing well is in use, the water pipe of the external pumping equipment is extended into the bottom of the well pipe 1, and the groundwater enters the well pipe 1 through the filter layer 2 and the filter pipe section 12, and is pumped out under the action of the pumping equipment to achieve the purpose of precipitation. The water-stopping reinforcement structure has a good blocking effect on the filter layer 2 and the gap outside the well wall through the expansion function of the clay ball layer 3, the grouting water-stopping of the grouting layer 4, and the reinforcement of the concrete layer 5. When the grouting layer 4 or the concrete layer 5 has defects such as gaps, grouting is carried out through the reserved grouting pipe 6, and the grouting liquid is discharged through the grouting holes to fill the defects of the grouting layer 4 and the concrete layer 5. In this way, the side wall seepage and sudden surge of the well pipe 1 are avoided, and the safety of foundation pit construction is improved.
[0025] Example 2
[0026] A water-stopping reinforcement structure for a foundation pit pressure relief well, such as Figure 2 As shown, the basic structure is the same as that of Example 1, and the only difference is that in this embodiment, the radial width of the water-stop reinforcement structure is not completely consistent from top to bottom, and the sealing effect of the water-stop reinforcement structure is further improved by reducing the width of the filter material layer 2. Specifically, the radial width of the filter material layer 2 is a, and the radial widths of the clay ball layer 3, the grouting layer 4, and the concrete layer 5 are b, and a<b. The top of the filter material layer 2 is flush with the top of the filter pipe section 12, and the radial width of the filter material layer 2 can be reduced by expanding the diameters of the filter pipe section 12 and the sedimentation pipe section 13.
[0027] Example 3
[0028] A water-stopping reinforcement structure for a foundation pit pressure relief well, such as Figure 3 As shown, the basic structure is the same as that of Example 2, with the only difference being that in this embodiment, two reinforcement units are provided, namely, one more grouting layer 4 and one more concrete layer 5 are provided to further enhance the water-stopping effect, and the grouting layer 4 in the added reinforcement unit is also provided with a reserved grouting pipe 6.
[0029] This specific implementation method is only an explanation of the utility model, not a limitation of the utility model. Any changes made by those skilled in the art after reading the specification of the utility model will be protected by the patent law as long as they are within the scope of the claims of the utility model.
Claims
1. A water-stopping reinforcement structure for a foundation pit decompression well, characterized by: It is arranged between the well pipe (1) and the wall of the drainage well hole; The well pipe (1) comprises a main pipe section (11) and a filter pipe section (12) located below the main pipe section (11) and having filter holes formed on the peripheral wall thereof; The water-stop reinforcement structure comprises, from bottom to top, a filled filter material layer (2), a clay ball layer (3) and at least one reinforcement unit, wherein the reinforcement unit comprises a grouting layer (4) and a concrete layer (5) arranged above the grouting layer (4); the filter material layer (2) is arranged at a height not lower than the top of the filter pipe section (12).
2. The water-stopping reinforcement structure for the foundation pit decompression well according to claim 1 is characterized by: Each of the grouting layers (4) is provided with at least one reserved grouting pipe (6), each of the reserved grouting pipes (6) is vertically arranged with its top end passing through the uppermost concrete layer (5), and a plurality of grouting holes are provided on its pipe body.
3. The water-stopping reinforcement structure for the foundation pit decompression well according to claim 1 is characterized by: The outer diameter of the water-stop reinforcement structure is consistent from top to bottom, the radial width of the filter material layer (2) is a, and the radial widths of the clay ball layer (3), the grouting layer (4) and the concrete layer (5) are b, and a<b.
4. The water-stopping reinforcement structure for the foundation pit decompression well according to claim 1 is characterized by: The reinforcement units are provided with two or more.