Search

CN-122013804-A - Double-small-tube water stop structure for deep pit deep well plugging and construction process

CN122013804ACN 122013804 ACN122013804 ACN 122013804ACN-122013804-A

Abstract

The invention relates to the technical field of deep well plugging of deep foundation pits, and discloses a double-small-pipe water stop structure for deep well plugging of a deep foundation pit and a construction process. The double-small-pipe water-stopping structure for deep pit blocking and the construction process thereof construct a multiple water-stopping sealing system of water-stopping structural layer water stopping, double-channel water-stopping wing ring water stopping and fire-fighting plug terminal sealing, wherein non-cured rubber asphalt waterproof coating and high polymer self-adhesive waterproof coiled materials are turned upwards from a bedding surface to comprehensively block a ground water channeling channel at the joint of the bedding surface and a well pipe to realize root water prevention, the double-channel water-stopping wing ring prolongs a ground water seepage path, increases water seepage resistance, forms a structural water-resisting layer to realize middle water stopping, the double-sealing structure of the fire-fighting plug realizes terminal tight blocking in a water-carrying state, and realizes the cutting of a leakage path by matching with basic sealing of a sealing steel plate and leakage from the outside channeling and the inside.

Inventors

  • ZHANG YANG
  • SUN JING
  • WEI JI
  • ZHOU RUOYANG
  • WU WENHU

Assignees

  • 中交浚浦建筑科技(上海)有限公司

Dates

Publication Date
20260512
Application Date
20260403

Claims (10)

  1. 1. The utility model provides a two tubule stagnant water structures of deep basal pit deep well shutoff, includes well tubular body (1) and is located bed course (2) around well tubular body (1) in the deep basal pit deep well, its characterized in that is provided with two tubule stagnant water structures on well tubular body (1), two tubule stagnant water structures include: a double small pipe assembly (3) comprising a first steel pipe (31) and a second steel pipe (32) arranged in parallel, the first steel pipe (31) and the second steel pipe (32) being for passing through a basement floor (8); Two sets of hydrofoil ring assemblies (4) are fixedly arranged on the outer side walls of the first steel pipe (31) and the second steel pipe (32) respectively; A sealing steel plate (5) horizontally arranged on the well pipe main body (1), wherein the sealing steel plate (5) is in sealing connection with the well pipe main body (1), and the first steel pipe (31) and the second steel pipe (32) penetrate through the sealing steel plate (5) and are in sealing connection with the sealing steel plate (5); A waterproof structure layer (6) which is arranged on the upper surface of the cushion layer (2) and is folded upwards to cover the inner wall of the well pipe main body (1) and the outer walls of the first steel pipe (31) and the second steel pipe (32); And the sealing plug (7) is detachably and hermetically connected to the first steel pipe (31) and the second steel pipe (32).
  2. 2. The double-small-pipe water stop structure for deep pit plugging according to claim 1, wherein the first steel pipe (31) is a pressure water drain pipe for connecting a pumping device, and the second steel pipe (32) is a pressure air inlet pipe for connecting a pressure air source.
  3. 3. The double-small-pipe water stop structure for deep pit deep well plugging according to claim 2, wherein the first steel pipe (31) and the second steel pipe (32) are hot-dip galvanized seamless steel pipes, the diameter of the first steel pipe (31) is 40mm, the diameter of the second steel pipe (32) is 25mm, and the center-to-center distance between the two steel pipes is 70 mm-90 mm.
  4. 4. The double-small-pipe water stop structure for deep pit deep well plugging according to claim 1, wherein each group of water stop wing ring assemblies (4) comprises an upper water stop wing ring (41) and a lower water stop wing ring (42), the upper water stop wing rings (41) and the lower water stop wing rings (42) are arranged at intervals in the vertical direction, the upper water stop wing rings (41) are positioned at 130-170 mm positions below the top surface of a basement bottom plate (8), the lower water stop wing rings (42) are positioned at 130-170 mm positions above the bottom surface of the basement bottom plate (8), and the distance between the upper water stop wing rings (41) and the lower water stop wing rings (42) is 280-320 mm; the upper water stop wing ring (41) and the lower water stop wing ring (42) are all round steel plates, the thickness is 4 mm-6 mm, the width is 90 mm-110 mm, and the upper water stop wing ring (41) and the lower water stop wing ring (42) are all installed in a full-welded connection mode during installation.
  5. 5. The double-small-pipe water stopping structure for deep pit deep well plugging according to claim 1, wherein the sealing steel plate (5) is a round steel plate, the diameter of the sealing steel plate is matched with the inner diameter of the well pipe main body (1), two through holes which are respectively matched with the outer diameters of the first steel pipe (31) and the second steel pipe (32) are formed in the sealing steel plate (5), the center distance between the two through holes is consistent with the center distance between the first steel pipe (31) and the second steel pipe (32), the outer edge of the sealing steel plate (5) is in full-welded connection with the inner wall of the well pipe main body (1), and the first steel pipe (31) and the second steel pipe (32) are in full-welded connection with the sealing steel plate (5) after penetrating through the through holes.
  6. 6. The double-small-tube water stopping structure for deep pit deep well plugging according to claim 1, wherein the waterproof construction layer (6) comprises a non-cured rubber asphalt waterproof coating layer (61) and a high-molecular self-adhesive waterproof coiled material layer (62) which are sequentially arranged from bottom to top, the thickness of the waterproof coating layer (61) is more than or equal to 2mm, the thickness of the waterproof coiled material layer (62) is more than or equal to 1.5mm, and the height of the waterproof construction layer (6) turned upwards from the upper surface of the cushion layer (2) is more than or equal to 80mm.
  7. 7. The double-small-pipe water stopping structure for deep pit plugging according to claim 1, wherein the sealing plug (7) comprises a threaded plug (71) and a sealing piece (72), the top ends of the first steel pipe (31) and the second steel pipe (32) are provided with internal threads, the threaded plug (71) is in fit connection with the internal threads, and the sealing piece (72) is arranged between the threaded plug (71) and the top end of the steel pipe to form a seal; The screw plug (71) is a brass internal wire plug, a nitrile rubber sealing ring is arranged in the brass internal wire plug, and the sealing piece (72) further comprises a raw material belt wound on the internal thread.
  8. 8. A construction process of a double-small-pipe water stop structure based on deep pit deep well plugging of any one of claims 1 to 8, characterized by comprising the following steps: step S1, scheme optimization and deepening, namely performing field investigation, optimizing a construction scheme according to investigation results, carrying out drawing deepening design and economic analysis in parallel based on the optimized scheme, and feeding back a problem to a scheme optimizing step for iterative adjustment when the drawing deepening or the economic analysis result does not meet the preset requirement until a final scheme meeting the requirement is obtained; s2, material preparation and inspection, namely, material selection is carried out based on a final scheme, a double-small-tube assembly (3), a water-stopping wing ring and a sealing steel plate (5) are prefabricated, and performance inspection is carried out on an incoming component, a water-proof material and a sealing assembly; S3, performing site construction, namely performing site construction after the materials are inspected to be qualified, wherein the site construction comprises the steps of constructing a waterproof structural layer (6) on a cushion layer (2), installing a sealing steel plate (5), installing a double-small-pipe assembly (3) and pouring concrete on a basement bottom plate (8); S4, plugging operation, namely stopping deep well dewatering after site construction is completed and plugging conditions are reached, and installing a sealing plug (7) to the top end of the double small pipes for plugging; And S5, checking the effect, namely checking the effect after the plugging operation.
  9. 9. The construction process of the double-small-pipe water stop structure for deep pit plugging of claim 8, wherein the step S3 is performed on site, and specifically comprises the following steps: The construction of the waterproof construction layer (6) is that the waterproof construction layer (6) is constructed on the cushion layer (2) around the deep well, so that the waterproof construction layer (6) covers the upper surface of the cushion layer (2) and is folded upwards to the inner wall of the well pipe main body (1); the sealing steel plate (5) is arranged, namely the sealing steel plate (5) is arranged in the well pipe main body (1), and the outer edge of the sealing steel plate (5) is fixed with the inner wall of the well pipe main body (1) in a sealing way; the double small pipe and the water stop wing ring are arranged, namely a double small pipe assembly (3) which is welded with the water stop wing ring in advance passes through a sealing steel plate (5), and the double small pipe and the sealing steel plate (5) are fixed in a sealing way; pouring the bottom plate, namely pouring concrete of the basement bottom plate (8), so that the double small pipes penetrate through the bottom plate and the top ends of the double small pipes are flush with the top surface of the bottom plate; And S4, during plugging operation, after stopping dewatering of the deep well, firstly observing the water level rising condition in the well, installing the sealing plug (7) after the water level is stable, fastening the sealing plug (7) by adopting a torque wrench in a separated mode, performing effect verification after installation, observing whether the bottom plate leaks or not, and trowelling the surfaces of the plug and the peripheral bottom plate by using cement mortar after the effect verification is qualified.
  10. 10. The construction process of a double-small-pipe water stop structure for deep pit plugging according to claim 9, wherein in the step S2, in the preparation and inspection of materials, if the inspection of materials is not qualified, the process returns to the drawing deepening step for design review and adjustment; and step S4, in the plugging operation, if the plugging effect is poor, returning to the site construction step for rectification.

Description

Double-small-tube water stop structure for deep pit deep well plugging and construction process Technical Field The invention relates to the technical field of deep well plugging of deep foundation pits, in particular to a double-small-pipe water stop structure for deep well plugging of a deep foundation pit and a construction process. Background Basement infiltration is a quality common disease existing in the building industry for a long time, the cause of the quality common disease is complex and various, poor plugging of deep well precipitation is one of important factors of basement bottom plate infiltration, and deep well precipitation is widely applied to groundwater control operation in deep foundation pit engineering. However, when a deep well is stopped and plugged, the conventional plugging process of grouting filling and welding pipe sealing is commonly adopted in the current industry, and the leakage risk is easy to occur. The existing deep well plugging process of the deep foundation pit takes a drain well phi 700mm and a relief well phi 273mm as an example, and the structure design and construction process are as follows: The structure design is that a single large-diameter well pipe 11 is used as a dewatering and plugging carrier, an annular water stop plate 12 is welded on the outer side of the well pipe 11, the diameter of the outer ring of the annular water stop plate 12 is 650mm, and the distance from the bottom excavation surface of a traditional cushion layer 13 is 550mm, so that the underground water circulation length is increased, and the underground water is prevented from flowing along the outer wall of the well pipe 11 to the basement bottom plate 14. The construction process comprises the steps of 1, after dewatering, putting 1 inch grouting pipes 15 into a well pipe 11, putting the grouting pipes 15 to the bottom of the well pipe 11, 2, filling melon seed pieces 16 into the well pipe 11 in a layering manner, synchronously injecting cement slurry 17 with the stirring water cement ratio of 0.8-1.0 through the grouting pipes 15, lifting the grouting pipes 150.5-1.0 m on each grouting 0.5-1.0 m, removing the grouting pipes 15 after grouting to the top surface of the melon seed pieces 16, 3, after observing that the water level does not rise obviously for 2-4 hours, pouring concrete 18 into the well pipe 11, pouring the concrete 18 to the height of 100mm above the top surface of a basement bottom plate 14, 4, after the concrete 18 is finally set, cutting off the exposed well pipe 11 above the top surface of the bottom plate 14, welding a sealing steel plate 19 at the position of 100mm below the top surface of the bottom plate 14, and finally trowelling the well mouth with the cement slurry 20, thus completing the plugging. The structural scheme and the construction process based on the technical characteristics have the inherent defects of structural damage and easy leakage, and are specifically as follows: The structural design defect is 1 that filling and blocking are realized by means of double combination of the concrete 18 of the bottom plate 14 and the outer wall of the well pipe 11 and the concrete 18 in the well pipe 11 and the inner wall of the well pipe 11. The large diameter of the deep well pipe 11 leads to wide contact surface, groundwater is easy to flow along the joint surface of the outer wall of the well pipe 11 and surrounding concrete 18 to form a leakage channel, 2, shrinkage of the concrete 18 is the inherent characteristic of materials, meanwhile, the concrete 18 and a smooth inner pipe wall are difficult to form tight occlusion, tiny gaps and even cracks are easy to form, and the deep well pipe 11 becomes a path for the groundwater to leak from the well pipe 11, 3, the large-diameter well pipe 11 penetrates through the bottom plate 14, so that double-layer bidirectional reinforcing steel bars of the bottom plate 14 are forced to be cut off at the well pipe 11, a continuous stress system cannot be formed, the structural integrity and stability of the bottom plate 14 are weakened, and hidden quality hazards are left. The construction process has the defects that the combination of the melon seed pieces 16 and the cement paste 17 is unreliable, the construction of the concrete 18 in the pipe well is unreliable, the vibrating equipment cannot go deep to cause the uncompacted vibrating because of the difficulty in the operation of the space in the pipe well, the honeycomb pitting surface is extremely easy to generate in the construction process, the bottom is easy to form a cavity, and a continuous water-proof barrier cannot be formed, the welding and sealing steel plate 19 in the step 4 needs to be welded, the concrete 18 of the bottom plate 14 which is cast and molded needs to be excavated and destroyed around the pipe well, and meanwhile, the welding quality depends on the operation of workers, so that the risk of imprecise sealing exists. The working condition