A dewatering well wall outside side gushing plugging structure

Abstract

The utility model is suitable for civil engineering construction technical field provides a kind of precipitation well well wall outside sudden gushing plugging structure, comprising: precipitation well well pipe;Water filter pipe, the water filter pipe is arranged in the precipitation well well pipe bottom and is communicated with the precipitation well well pipe;Filter material, the filter material is filled in the annular space between the water filter pipe and well hole wall;Grouting pipe, the grouting pipe extends from the precipitation well well pipe top to the water filter pipe bottom;Melon seed piece, the melon seed piece fills in the precipitation well well pipe to predetermined height.The precipitation well well wall outside sudden gushing plugging structure provided by the scheme, by the synergies of precipitation well well pipe, water filter pipe, filter material, grouting pipe, melon seed piece, water stop, grouting machine and clay ball, effectively plugging to the precipitation well well wall outside sudden gushing is realized in whole, solves the problem of current clay ball and soil plugging not strictly and waste after well sealing excavation.

Description

Technical Field

[0001] This utility model belongs to the field of civil engineering construction technology, and in particular relates to a structure for sealing sudden surges on the outer side of a dewatering well wall. Background Technology

[0002] With the development of civil engineering technology, underground space development has become a trend, and ultra-deep foundation pit projects are emerging one after another. In foundation pit projects, foundation pit dewatering is of utmost importance. It refers to the dewatering work carried out during excavation when the groundwater level is higher than the bottom of the excavation surface, and groundwater will seep into the pit. In order to ensure the foundation pit is dry for construction and prevent slope instability, quicksand in the foundation, pit bottom heave, piping, and a decrease in the bearing capacity of the foundation.

[0003] Wellpoint dewatering is a common method for dewatering modern foundation pits. It involves burying a number of filter pipes around the foundation pit before excavation and using pumping equipment to remove water, keeping the excavated soil dry. The purpose of dewatering wells is to extract groundwater to reduce groundwater pressure, but leakage is the most concerning issue, as it directly affects the normal use of the dewatering wells and endangers the safety of foundation pit construction.

[0004] Currently, the traditional method for backfilling depressurization wells involves placing clay balls between the well bottom, well pipe, and well wall after the well is installed. If the clay balls are of poor quality, pressurized water will seep upwards along the well wall, causing severe surges and rendering the depressurization well ineffective. After filling with clay balls, soil is usually used for backfilling upwards. However, if the clay balls are not effectively sealed, the soil will also be unable to prevent pressurized water leakage, leading to surges and well sealing failure. Furthermore, the soil used for backfilling is often coarse, requiring the excavation of the backfill above the excavation surface after sealing, which increases costs and results in waste. Utility Model Content

[0005] This utility model provides a structure for sealing sudden surges on the outer side of a dewatering well wall, aiming to solve the problems of inadequate sealing with clay balls and soil, as well as the waste of excavation after sealing the well.

[0006] This utility model is implemented as follows: a sudden surge sealing structure on the outer side of a dewatering well wall, comprising: a dewatering well pipe; a filter pipe, the filter pipe being disposed at the bottom of the dewatering well pipe and communicating with the dewatering well pipe; filter material, the filter material filling the space between the filter pipe and the well wall; a grouting pipe, the grouting pipe extending from the top of the dewatering well pipe to the bottom of the filter pipe; sunflower seed chips, the sunflower seed chips filling the dewatering well pipe to a predetermined height; a waterstop plate, the waterstop plate being fixed to the outer wall of the dewatering well pipe and located at a design elevation above the excavation surface of the foundation pit; a grouting machine, the grout outlet of the grouting machine being fixedly connected to the grouting pipe for injecting cement grout into the filter pipe; and clay balls, filling the bottom outer side of the dewatering well pipe.

[0007] Preferably, the waterstop plate has a double-layer structure, including a first waterstop plate and a second waterstop plate with a vertical spacing of 1000mm; the outer diameter of the first waterstop plate is 900mm, the outer diameter of the second waterstop plate is 650mm, and the wall thickness of both is 10mm.

[0008] Preferably, the grouting machine uses pre-mixed cement grout with a water-cement ratio of 0.8:1.

[0009] Preferably, after the sunflower seed chips are filled to a predetermined height, cement grout is injected into the top surface of the sunflower seed chips through the grouting pipe.

[0010] Preferably, concrete is poured into the well pipe of the dewatering well to a depth of 10cm above the top surface of the base slab.

[0011] Preferably, the bottom of the outer side of the dewatering well pipe is sealed with the clay ball.

[0012] Compared with related technologies, the surge sealing structure on the outer side of the dewatering well wall provided by this utility model has the following beneficial effects: Through the synergistic action of the dewatering well pipe, filter pipe, filter media, grouting pipe, clay pellets, waterstop plate, grouting machine, and clay balls, the system effectively seals the sudden surge on the outside of the dewatering well wall. The combined effect of these components reduces the risk of pressurized water leakage and sudden surge, avoids the material waste and cost increases associated with traditional backfilling methods, and ensures the normal use of the dewatering well and the safety of the foundation pit construction. The double-layer design of the waterstop plate enhances structural stability, the pre-mixed cement grout injected by the grouting machine, in combination with the clay pellets, improves the sealing tightness, and the clay ball sealing at the bottom, combined with concrete backfilling, strengthens the external sealing. Furthermore, the sealing effect is optimized in a timely manner through water level monitoring and supplementary grouting. Attached Figure Description

[0013] Figure 1 This is a front sectional view of a structure for sealing a sudden surge on the outer side of a dewatering well wall, provided by this utility model.

[0014] Attached reference numerals: 1. Dewatering well pipe; 2. Filter pipe; 3. Filter media; 4. Grouting pipe; 5. Peeling chips; 6. Waterstop plate; 7. Grouting machine; 8. Clay ball. Detailed Implementation

[0015] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0016] This utility model embodiment provides a structure for sealing sudden surges on the outer side of a dewatering well wall, such as... Figure 1 As shown, the surge sealing structure on the outer side of the dewatering well wall includes: a dewatering well pipe 1; a filter pipe 2, which is located at the bottom of the dewatering well pipe 1 and communicates with it; filter material 3, which fills the annular space between the filter pipe 2 and the well wall; a grouting pipe 4, which extends from the top of the dewatering well pipe 1 to the bottom of the filter pipe 2; sunflower seed chips 5, which fill the dewatering well pipe 1 to a predetermined height; a waterstop plate 6, which is fixed to the outer wall of the dewatering well pipe 1 and located at a design elevation above the excavation surface of the foundation pit; a grouting machine 7, whose grout outlet is fixedly connected to the grouting pipe 4 and used to inject cement grout into the filter pipe 2; and clay balls 8, which are filled at the bottom outer side of the dewatering well pipe 1.

[0017] In this embodiment, clay balls 8 are first filled to seal the bottom of the outer side of the dewatering well pipe 1. The filter pipe 2 is placed at the bottom of the dewatering well pipe 1 and connected. Filter material 3 is filled in the annular space between the filter pipe 2 and the well wall. Then, the waterstop plate 6 is fixed to the outer wall of the dewatering well pipe 1, with its center line located 1000mm above the design elevation of the excavation surface at the bottom of the foundation pit. The grouting pipe 4 is extended from the top of the dewatering well pipe 1 to the bottom of the filter pipe 2. Then, the dewatering well pipe 1 is filled with melon seed chips 5 to a predetermined height. After that, the grout outlet of the grouting machine 7 is connected to the grouting pipe 4. The pre-mixed cement slurry is injected into the filter pipe 2 through the grouting machine 7 to the top surface of the melon seed chips 5. Then, the grouting pipe 4 is removed.

[0018] Once the cement grout has reached its final setting time, observe the water level changes in the dewatering well pipe 1 to determine the grouting effect, and perform supplementary grouting if necessary. After grouting is completed, pour concrete into the dewatering well pipe 1 up to 10cm below the bottom slab structure surface, and observe the water level changes to determine the sealing status. Finally, cut off all exposed dewatering well pipes 1, weld the pipe opening with an iron plate, and then smooth the well opening with concrete to complete the sealing. At the same time, backfill the outside of the dewatering well pipe 1 with concrete up to the excavation surface.

[0019] The structure enhances the stability of the sealing by setting a waterstop plate 6, and uses a grouting machine 7 to inject cement grout combined with grout chips 5 to improve the sealing tightness and reduce the risk of pressurized water leakage. Concrete backfilling is used instead of traditional soil backfilling, so there is no need to excavate the backfill part after the well is sealed, which reduces costs and waste and helps to ensure the normal use of the dewatering well and the safety of the foundation pit construction.

[0020] In a further preferred embodiment of this utility model, the waterstop plate 6 has a double-layer structure, including a first waterstop plate and a second waterstop plate with a vertical spacing of 1000mm; the outer diameter of the first waterstop plate is 900mm, the outer diameter of the second waterstop plate is 650mm, and the wall thickness of both is 10mm.

[0021] In this embodiment, when installing the waterstop plate 6, the first and second waterstop plates, which form a double-layer structure, are fixed to the outer wall of the dewatering well pipe 1, maintaining a vertical distance of 1000mm between them, and both are located at the design elevation above the bottom excavation surface of the foundation pit. The outer diameter of the first waterstop plate is set to 900mm, and the outer diameter of the second waterstop plate is set to 650mm. Both have a wall thickness of 10mm and are connected and fixed to the outer wall of the dewatering well pipe 1 by welding. After installation, the double-layer waterstop plate participates in subsequent grouting and concrete filling processes along with the overall sealing structure. During the process where groundwater may seep upwards along the well wall, the first and second waterstop plates form multiple barriers, increasing the resistance to the seepage path through their different diameter structural design, and working in conjunction with other sealing components. This double-layer waterstop structure enhances the ability to block groundwater seepage through the synergistic effect of the upper and lower layers. The different diameters can adapt to the sealing needs of different ranges around the well wall. The 10mm wall thickness ensures the structural strength, helps to improve the stability of the overall sealing structure, reduces the risk of sudden surge, and further ensures the safety of the foundation pit construction process.

[0022] In a further preferred embodiment of this utility model, the grouting machine 7 uses pre-mixed cement slurry with a water-cement ratio of 0.8:1.

[0023] In this embodiment, a pre-mixed cement slurry is prepared using a grouting machine 7, with the water-cement ratio controlled at 0.8:1.0. After the seed chips 5 in the well pipe 1 of the dewatering well are filled to a predetermined height, the slurry outlet of the grouting machine 7 is connected to the grouting pipe 4, allowing the cement slurry to be injected through the grouting pipe 4 until the cement slurry reaches the top surface of the seed chips 5, after which the grouting pipe 4 is removed.

[0024] During the grouting process, the pre-mixed cement grout, with its pre-adjusted water-cement ratio, can be continuously injected directly through the grouting machine 7, eliminating the need for on-site mixing and making the grouting operation more seamless. The water-cement ratio of 0.8:1.0 allows the cement grout to maintain suitable fluidity, facilitating its filling of the gaps in the cement chips 5 and forming a dense structure together with the cement chips 5. The use of this pre-mixed cement grout and specific water-cement ratio reduces the time required for on-site cement grout preparation and improves grouting efficiency. Simultaneously, the appropriate water-cement ratio helps the cement grout fully fill gaps, enhances its bonding with the cement chips (5), improves the sealing effect, and, in conjunction with other components, better prevents groundwater leakage, thus supporting the safety of foundation pit construction.

[0025] In a further preferred embodiment of this utility model, after the sunflower seed chips 5 are filled to a predetermined height, cement grout is injected into the top surface of the sunflower seed chips 5 through the grouting pipe 4. After the grouting is completed, the grouting pipe 4 is removed. After the grouting is completed, the grouting effect is judged by observing the water level change in the well pipe 1 of the dewatering well; if the water level drops abnormally, supplementary grouting is performed.

[0026] In this embodiment, sunflower seed chips 5 are filled to a predetermined height inside the dewatering well pipe 1. Then, cement grout is injected into the well pipe through the grouting pipe 4 until the cement grout covers the top surface of the sunflower seed chips 5. After grouting is completed, the grouting pipe 4 is removed. After the cement grout reaches its final setting time, the water level change inside the dewatering well pipe 1 is observed to determine the grouting effect. If an abnormal drop in water level is found, supplementary grouting is performed. During grouting, the grouting agent 5 provides a stable filling base for the cement grout. The cement grout filling to its top surface forms a continuous sealing layer, and the combination of the two makes the sealing structure inside the well casing more complete. By observing water level changes to assess the effectiveness, any gaps or incomplete areas during grouting can be detected promptly, making supplementary grouting more targeted. This method of operation, combining the grout with cement slurry, enhances the compactness of the filling inside the well casing, reducing leakage channels. Furthermore, the step of assessing the effectiveness based on water level changes and performing supplementary grouting allows for timely remediation of grouting defects, improving the reliability of the sealing, further reducing the risk of groundwater leakage, and ensuring the normal function of the dewatering well.

[0027] In a further preferred embodiment of this utility model, after the bottom of the outer side of the dewatering well pipe 1 is sealed with the clay ball 8, concrete is used to backfill to the excavation surface; after the sealing is completed, the exposed dewatering well pipe 1 is cut off, the pipe opening is sealed with iron plate welding, and then the well opening is smoothed with concrete.

[0028] In this embodiment, clay balls 8 are used to seal the bottom of the outer side of the dewatering well pipe 1. After completion, concrete is used to backfill to the excavation face. After the overall sealing operation is completed, all exposed dewatering well pipes 1 are cut off, iron plates are welded to the pipe opening to seal it, and then the well opening is smoothed with concrete to complete the well sealing.

[0029] During the sealing process, the clay ball 8 forms a preliminary seal on the bottom outer side of the dewatering well pipe 1, preventing groundwater from seeping upwards. The subsequent filling concrete, in conjunction with the clay ball 8, forms a more stable outer sealing structure. The subsequent cutting, welding, and smoothing operations after sealing ensure a more thorough seal at the wellhead, reducing the possibility of later leakage.

[0030] Using this method, the clay ball 8 is sealed at the bottom and backfilled with concrete, which enhances the sealing and structural stability of the outside of the dewatering well pipe 1. A series of operations after the sealing is completed further ensure the sealing effect of the wellhead, which helps to reduce the risk of leakage. At the same time, it avoids the need for excavation after traditional soil backfilling, reducing material waste and cost expenditure.

[0031] In summary, compared with related technologies, the synergistic effect of the dewatering well pipe 1, filter pipe 2, filter media 3, grouting pipe 4, grouting chips 5, waterstop 6, grouting machine 7, and clay balls 8 effectively seals the sudden surge on the outside of the dewatering well wall. The combined action of the components reduces the risk of pressurized water leakage and sudden surge, avoids material waste and increased costs associated with traditional backfilling methods, and ensures the normal use of the dewatering well and the safety of foundation pit construction. The double-layer design of the waterstop 6 enhances structural stability, the pre-mixed cement grout injected by the grouting machine 7, in conjunction with the grouting chips 5, improves the sealing tightness, and the clay balls 8, combined with concrete backfilling, strengthen the outer sealing. Furthermore, the sealing effect is optimized in a timely manner through water level monitoring and supplementary grouting.

[0032] The combined effect of these components reduces the risk of pressurized water leakage and sudden surges, avoids material waste and increased costs associated with traditional backfilling methods, ensures the normal use of dewatering wells and the safety of foundation pit construction, and improves the overall economy and reliability of the construction.

[0033] It is worth noting that the circuits, electronic components, and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0034] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus may be implemented in other ways.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.

Claims

1. A structure for sealing sudden gushing water on the outer side of a dewatering well wall, characterized in that, include: Dewatering well casing; A filter pipe is installed at the bottom of the dewatering well pipe and is connected to the dewatering well pipe; Filter media, which fills the annular space between the filter pipe and the well wall; Grouting pipe, which extends from the top of the dewatering well pipe to the bottom of the filter pipe; Sunflower seed chips, which are filled into the well pipe of the dewatering well to a predetermined height; A waterstop plate is fixed to the outer wall of the dewatering well pipe and is located at the design elevation above the bottom excavation surface of the foundation pit. The grouting machine has its outlet end fixedly connected to the grouting pipe and is used to inject cement grout into the filter pipe. Clay balls are filled at the bottom of the outer side of the well casing of the dewatering well.

2. The surge sealing structure on the outer side of the well wall of the dewatering well as described in claim 1, characterized in that, The waterstop plate has a double-layer structure, including a first waterstop plate and a second waterstop plate with a vertical spacing of 1000mm; the outer diameter of the first waterstop plate is 900mm, the outer diameter of the second waterstop plate is 650mm, and the wall thickness of both is 10mm.

3. The surge sealing structure on the outer side of the well wall of the dewatering well as described in claim 1, characterized in that, The grouting machine uses pre-mixed cement grout with a water-cement ratio of 0.8:

1.

4. The surge sealing structure on the outer side of the well wall of the dewatering well as described in claim 1, characterized in that, After the sunflower seed chips are filled to a predetermined height, cement grout is injected into the top surface of the sunflower seed chips through the grouting pipe.

5. The surge sealing structure on the outer side of the dewatering well wall as described in claim 1, characterized in that, Concrete was poured into the well pipe of the dewatering well to a depth of 10cm above the top surface of the base slab.

6. The surge sealing structure on the outer side of the dewatering well wall as described in claim 1, characterized in that, The bottom of the outer side of the dewatering well casing is sealed with the clay ball.

Images