A method for sealing bottom slab dewatering wells

Abstract

This invention discloses a method for sealing dewatering wells in slab foundations, comprising the following steps: S1, chiseling concrete around the dewatering well at the floor level; S2, continuously draining water, and after confirming a drop in water level, cutting the upper part of the dewatering well with oxyacetylene welding to below the finished floor level, and immediately placing a precast steel cage after cutting, with the upper steel bars of the cage welded to the original structural steel bars; S3, dewatering the well by inserting a self-priming water pump through a seamless steel pipe; S4, pouring the first layer of concrete up to the lower part of the cut well opening, continuously draining water with a pump, and curing the first layer of concrete to 100% strength; S5, after the first layer of concrete has been poured and cured completely, sealing the top of the seamless steel pipe with a hot-dip galvanized wire-threaded cap; S6, after the groundwater level rises, continuously observing until there are no water stains before pouring the second layer of concrete; S7, pouring the third layer of concrete; This invention provides a reasonably designed and standardized method for sealing dewatering wells in slab foundations.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically a method for sealing dewatering wells in foundation slabs. Background Technology

[0002] In actual construction, some projects have buildings close to the boundary line. Geological survey units often place dewatering wells within the basement floor slab in the dewatering well layout design. This method facilitates groundwater level control and effectively ensures the quality of the building structure. However, it also presents a challenge in controlling the quality of the basement dewatering well sealing process. Because the groundwater within the dewatering wells is often pressurized and presents a large volume, these adverse factors are particularly concentrated when sealing the last dewatering well. Improper handling can lead to water seepage and leakage in the floor slab, negatively impacting the protection of other finished products in the basement. Summary of the Invention

[0003] This method overcomes these difficulties and provides a reasonable and standardized method for sealing dewatering wells in the foundation slab.

[0004] To achieve this objective, the present invention provides the following technical solution:

[0005] This invention provides a method for sealing bottom slab dewatering wells, comprising the following steps:

[0006] S1. Take the dewatering well at the floor level as the center and chisel out the concrete around it;

[0007] S2. Continue to drain water. After confirming that the water level has dropped, use oxy-acetylene welding to cut the upper dewatering well down to below the finished floor level. After cutting, immediately put in the precast steel cage. The upper steel bars of the steel cage are welded to the original structural steel bars.

[0008] S3. Dewatering is carried out in the well by inserting a self-priming water pump through a seamless steel pipe;

[0009] S4. Pour the first layer of concrete up to the bottom of the cut well opening, and continuously drain the water using a water pump to cure the first layer of concrete to 100% strength.

[0010] S5. After the first layer of concrete has been poured and cured, the top of the seamless steel pipe is sealed with a hot-dip galvanized wire-threaded pipe cap.

[0011] S6. After the groundwater level rises, observe continuously until there are no water stains before pouring the second layer of concrete.

[0012] S7. Pour the third layer of concrete.

[0013] Preferably, the method for preparing the reinforcing cage in step S2 is as follows: a hole is made at the center of a circular steel support plate, and a hot-dip galvanized seamless steel pipe with a water-stop ring is welded to the water-facing side of the steel support plate through the hole. The end of the φ18 steel bar is processed to 90° and welded to the 5mm thick steel support plate with a diameter of 285mm to be used as a continuous reinforcing bar. The φ8 stirrups are spirally tied to the continuous reinforcing bar.

[0014] Preferably, both the first and second layers of concrete are high-strength, high-permeability, micro-expansion concrete.

[0015] Preferably, in step S6, the observation period is 5-8 days.

[0016] Preferably, in step S6, the second layer of concrete is poured to the top of the reinforcing cage, the protective layer thickness is 25-30mm, and it is continuously cured for no less than 14 days.

[0017] Preferably, between steps S6 and S7, a rubber waterstop strip and a φ6@200 steel mesh are placed at the construction joint at the edge of the second layer of concrete.

[0018] Compared with existing technologies, the beneficial effects and significant advancements of this invention are as follows: The method for sealing the dewatering wells in the foundation slab provided by this invention effectively solves the problem of foundation slab leakage caused by improper sealing of dewatering wells. The design is reasonable, the construction is standardized, and the treatment is scientific, leaving no hidden dangers. Attached Figure Description

[0019] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly introduced below.

[0020] Obviously, the accompanying drawings described below are only some of the drawings of the embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort, but these other drawings are also within the scope of the drawings required for the embodiments of the present invention.

[0021] Figure 1 This is a construction effect diagram of a method for sealing a bottom slab dewatering well according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the concrete removal section according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the arrangement of continuous reinforcing bars on a hot-dip galvanized steel sheet according to an embodiment of the present invention;

[0024] Figure 4 This is a partial construction effect diagram of a method for sealing a bottom slab dewatering well according to an embodiment of the present invention;

[0025] In the diagram, 1. Seamless steel pipe, 2. Reinforcing bar, 3. First layer of concrete, 4. Water-stop ring, 5. Hot-dip galvanized wire threaded pipe cap, 6. Second layer of concrete, 7. Original structural reinforcing bar, 8. Water-stop strip, 9. Third layer of concrete. Detailed Implementation

[0026] To make the objectives, technical solutions, beneficial effects, and significant advancements of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings provided in the embodiments of the present invention.

[0027] Obviously, all the embodiments described are only some embodiments of the present invention, and not all embodiments; based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," and "third" (if present), etc., in the specification, claims, and accompanying drawings of the embodiments of this invention, are only used to distinguish different objects and not to describe a specific order. Furthermore, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0029] What needs to be understood is:

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "installation", "connection", "fixation" and the like should be interpreted broadly. For example, it can be a fixed connection, a detachable connection or a movable connection, or it can be an integral part; it can be a direct connection, an indirect connection through an intermediate medium, or an invisible signal connection, or even an optical connection; it can be the internal connection of two elements or the interaction between two elements, unless otherwise explicitly limited.

[0031] Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] It should also be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0033] The technical solution of the present invention will now be described in detail with reference to specific embodiments.

[0034] Example 1

[0035] like Figure 1 As shown, a method for sealing a bottom slab dewatering well includes the following steps:

[0036] S1. Take the dewatering well at the floor level as the center and chisel out the concrete around it;

[0037] S2. Continue to drain water. After confirming that the water level has dropped, use oxy-acetylene welding to cut the upper dewatering well to below the finished floor level. After cutting, immediately put in the precast steel cage. The upper steel bars of the steel cage are welded to the original structural steel bars 7.

[0038] S3. Dewatering is carried out in the well by inserting a self-priming water pump through a seamless steel pipe.

[0039] S4. Pour the first layer of concrete to the bottom of the cut well opening, and continuously drain the water using a water pump to cure the first layer of concrete to 100% strength.

[0040] S5. After the first layer of concrete has been poured and cured, the top of the seamless steel pipe is sealed with a hot-dip galvanized wire-threaded pipe cap.

[0041] S6. After the groundwater level rises and is observed continuously until there are no water stains, the second layer of concrete can be poured.

[0042] S7. Pour the third layer of concrete.

[0043] Preferably, the method for preparing the reinforcing cage in step S2 is as follows: a hole is made at the center of the circular steel support plate, and a hot-dip galvanized seamless steel pipe 1 with a water-stop ring 4 is welded to the water-facing side of the steel support plate through the hole. The end of the φ18 reinforcing bar 2 is processed to 90° and welded to the 5mm thick and 285mm diameter steel support plate as a continuous reinforcing bar. The φ8 stirrup is spirally tied to the continuous reinforcing bar.

[0044] In this embodiment, both the first and second layers of concrete are high-strength, high-permeability, micro-expansion concrete.

[0045] In this embodiment, in step S6, the observation period is 5-8 days.

[0046] In this embodiment, in step S6, the second layer of concrete is poured to the top of the reinforcing cage, the protective layer thickness is 25-30mm, and it is continuously cured for no less than 14 days.

[0047] In this embodiment, between steps S6 and S7, a rubber waterstop strip 8 and a φ6@200 steel mesh are placed at the construction joint at the edge of the second layer of concrete.

[0048] Example 2

[0049] The "Method for Sealing Dewatering Wells in Basement Floors" of this embodiment mainly consists of a steel dewatering well with a diameter of 280mm pre-embedded in the bottom of the floor, a steel support plate with a diameter of 285mm and a thickness of 5mm, a DN50 hot-dip galvanized seamless steel pipe with a thickness of 5mm, φ18 steel bars connected to the steel support plate, φ8 stirrups, a hot-dip galvanized wire-threaded pipe cap matched with the seamless steel pipe, and a rubber waterstop for sealing construction joints.

[0050] The construction steps are as follows:

[0051] 1. Using the dewatering well at the floor level as the center, chisel away concrete around it. The chiseling area should be square, with the upper part chiseled in a corbel shape. Refer to the attached document for corresponding chiseling dimensions. Figure 2 .

[0052] 2. Drill a hole at the center of the circular steel support plate. Weld a hot-dip galvanized seamless steel pipe with a water-stop ring to the water-facing side of the steel support plate through the hole. Process the ends of φ18 steel bars to 90° and weld them onto the 5mm thick, 285mm diameter steel support plate as continuous reinforcement. Spiral tie φ8 stirrups onto the continuous reinforcement to construct a steel cage, as shown in the attached diagram. Figure 3 .

[0053] 3. Continue to drain water. Once the water level is confirmed to have dropped, use oxyacetylene welding to cut the upper dewatering well down to below the finished floor level. After cutting, immediately place the precast steel cage in the ground. The upper steel bars of the steel cage are welded to the original structural steel bars.

[0054] 4. A self-priming water pump is inserted through a seamless steel pipe to lower the water level in the well, ensuring that the water level in the well is lower than the bottom steel plate, thus guaranteeing that the first layer of concrete has a sufficient curing period.

[0055] 5. Pour high-strength, high-permeability, micro-expansion concrete at the bottom of the cut wellhead, continuously drain water using a pump, and cure the first layer of concrete to 100% strength.

[0056] 6. Utilizing the seamless nature of seamless steel pipes to prevent groundwater from seeping into the concrete, after the first layer of concrete has been poured and cured completely, the top of the seamless steel pipe is sealed with a hot-dip galvanized wire-threaded cap. (See attached...) Figure 4 .

[0057] 7. After the groundwater level rises, observe for 5 days. Only after no water stains are observed can the second layer of concrete be poured. The concrete should be poured up to the top of the reinforcing cage, with a protective layer thickness of 25mm. After curing for 14 days, place rubber waterstops at the construction joints and install φ6@200 steel mesh. Then pour the third layer of surface concrete.

[0058] In the description process of the above instruction manual:

[0059] The terms "this embodiment," "an embodiment of the present invention," "as shown," "further," and "further improved technical solutions," etc., indicate that the specific features, structures, materials, or characteristics described in the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms are not necessarily directed at the same embodiment or example, and the specific features, structures, materials, or characteristics described can be combined or combined in any suitable manner in one or more embodiments or examples. Furthermore, without causing contradiction, those skilled in the art can combine or combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0060] Finally, it should be noted that:

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them;

[0062] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. Non-essential improvements, adjustments or substitutions made by those skilled in the art based on the content of this specification are all within the scope of protection claimed by the present invention.

Claims

1. A method for sealing a bottom slab dewatering well, characterized in that, The following steps are involved: S1. Take the dewatering well at the floor level as the center and chisel out the concrete around it; S2. Continue to drain water. After confirming that the water level has dropped, use oxyacetylene welding to cut the upper dewatering well to below the finished floor level. Make a hole at the center of the circular steel support plate. Weld the hot-dip galvanized seamless steel pipe with a water-stop ring to the water-facing side of the steel support plate through the hole. Process the end of the φ18 steel bar to 90° and weld it to the 5mm thick, 285mm diameter steel support plate as a continuous reinforcement. Spiral tie the φ8 stirrups to the continuous reinforcement to form a prefabricated steel cage. After cutting to below the finished floor level, weld the upper steel bars of the steel cage to the original structural steel bars. S3. Dewatering is carried out in the well by inserting a self-priming water pump through a seamless steel pipe; S4. Pour the first layer of concrete up to the bottom of the cut well opening, and continuously drain the water using a water pump to cure the first layer of concrete to 100% strength. S5. After the first layer of concrete has been poured and cured, the top of the seamless steel pipe is sealed with a hot-dip galvanized wire-threaded pipe cap. S6. After the groundwater level rises, observe continuously until there are no water stains before pouring the second layer of concrete. S7. Pour the third layer of concrete.

2. The method for sealing a bottom slab dewatering well as described in claim 1, characterized in that, Both the first and second layers of concrete are high-strength, high-permeability, micro-expansion concrete.

3. The method for sealing a bottom slab dewatering well as described in claim 2, characterized in that, In step S6, the observation period is 5-8 days.

4. The method for sealing a bottom slab dewatering well as described in claim 1, characterized in that, In step S6, the second layer of concrete is poured to the top of the reinforcing cage, with a protective layer thickness of 25-30mm, and continuous curing for no less than 14 days.

5. The method for sealing a bottom slab dewatering well as described in claim 1, characterized in that, Between steps S6 and S7, the following is also included: placing a rubber waterstop strip and a φ6@200 steel mesh at the construction joint at the edge of the second layer of concrete.

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