Deep foundation pit bottom plate high-pressure grouting plugging gushing water comprehensive treatment system and construction method

Abstract

The invention relates to a deep foundation pit bottom plate high-pressure grouting plugging gushing water comprehensive treatment system and a construction method. The deep foundation pit bottom plate high-pressure grouting plugging gushing water comprehensive treatment system comprises a deep foundation pit vacuum light well point dewatering system, a gushing area steel plate net isolation system, a high-pressure grouting plugging system and a bottom plate hole water stopping plugging structure. A water burst area is arranged on the lower portion of the bottom plate. The deep foundation pit vacuum light well point dewatering system has the beneficial effects that the deep foundation pit vacuum light well point dewatering system is adopted for construction, installation is easy, the overall structure is stable, the influence on the surrounding environment is small, and the dewatering effect is good; the steel plate net isolation system in the water gushing area is adopted for construction, water flow diffusion is effectively avoided, and meanwhile safe operation of constructors is guaranteed; construction is conducted through the high-pressure grouting plugging system, operation is convenient, the plugging effect is good, and the construction efficiency is improved; the bottom plate hole water stop plugging structure is adopted for construction, the structure is simple, the influence on an existing structure is reduced, the plugging effect is good, and the integrity of a plugged bottom plate is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of foundation and base engineering, and particularly relates to a deep foundation pit bottom plate high-pressure grouting plugging water gushing comprehensive treatment system and a construction method. BACKGROUND

[0002] With the increasingly mature building construction technology in China, the deep foundation pit construction technology has become a very common problem in foundation construction. The deep foundation pit construction is a complex geological construction technology, which faces many problems in the construction process. The water gushing treatment of the bottom plate concrete pouring is an important part of the entire deep foundation pit construction and an important component for the construction unit to focus on. Strengthening the water gushing treatment can not only prevent the water accumulation phenomenon, but also provide protection for the effective operation of the deep foundation pit. How to adopt effective measures for plugging when water gushing occurs is a difficult problem.

[0003] In view of the foregoing, in view of the deficiencies in the previous deep foundation pit bottom plate water gushing treatment construction, there is an urgent need for a new deep foundation pit bottom plate high-pressure grouting plugging water gushing comprehensive treatment system and a construction method, which has the characteristics of good plugging effect, improved construction quality and efficiency, and safe and reliable construction process. SUMMARY

[0004] The purpose of the present application is to overcome the deficiencies in the prior art, and to provide a deep foundation pit bottom plate high-pressure grouting plugging water gushing comprehensive treatment system and a construction method.

[0005] The deep foundation pit bottom plate high-pressure grouting plugging water gushing comprehensive treatment system comprises a deep foundation pit vacuum light well point dewatering system, a water gushing area steel mesh isolation system, a high-pressure grouting plugging system, and a bottom plate hole water stop plugging structure. The bottom plate is provided at the bottom of the foundation pit, and the water gushing area is provided at the lower part of the bottom plate. The water gushing area has water gushing. The bottom plate cushion layer is arranged at the lower part of the bottom plate. The deep foundation pit vacuum light well point dewatering system comprises an inner support, a main pipe, and branch pipes. The inner support is arranged in the foundation pit, the main pipe and the branch pipes are hung at the bottom of the inner support, and the main pipe is connected with a water pump. The water gushing area steel mesh isolation system comprises a steel mesh, which is arranged on the side wall of the water gushing area. The high-pressure grouting plugging system comprises a circular iron bucket, which is installed in the foundation pit. The bottom plate hole water stop plugging structure comprises a bottom plate slot opening, which is provided in the bottom plate.

[0006] As a preferred embodiment, the deep foundation pit vacuum light well point dewatering system comprises a suspender, a water pumping pipe, and a water pump. The upper end of the suspender is fixed to the inner support, the lower end of the suspender is provided with a main pipe fixing ring, the main pipe fixing ring is fixed with the main pipe, a plurality of branch pipes are connected to the bottom of the main pipe, and the bottom of the branch pipe is provided with a filter pipe. The water pump is placed on the bottom plate outside the water gushing area. One end of the water pumping pipe is connected to the main pipe, and the other end is connected to the water pump.

[0007] As preferred, the steel mesh isolation system of the water gushing area comprises a bottom mat and U-shaped fixing nails, the bottom of the steel mesh is connected with a bottom connecting rib, and the U-shaped fixing nails are fixed on the bottom connecting rib, the soil at the bottom of the water gushing area and between the upper part of the steel mesh and the bottom mat.

[0008] As preferred, the high-pressure grouting plugging system comprises a circular iron bucket and a cover pressing rod; the circular iron bucket is arranged at the water gushing position in the steel mesh, the top of the circular iron bucket is provided with an iron bucket cover; a pre-buried sleeve is arranged in the bottom mat; the cover pressing rod is arranged at the upper part of the iron bucket cover, and the two ends of the cover pressing rod are fixed in the pre-buried sleeve; a plurality of grouting holes are arranged on the iron bucket cover, and a grouting pipe is arranged in each grouting hole.

[0009] As preferred, the bottom hole water stop plugging structure comprises a waterproof layer, a bottom steel bar and plugging concrete; a bottom slot opening is arranged in the bottom plate of the water gushing area, the waterproof layer is arranged on the bottom mat at the bottom slot opening, the bottom steel bar is arranged in the bottom slot opening, the bottom steel bar is provided with a water stop plate, and the plugging concrete is poured in the bottom slot opening.

[0010] The construction method of the deep foundation pit bottom high-pressure grouting plugging water gushing comprehensive treatment system comprises the following steps: Step one, construction preparation: relevant materials and equipment enter the site; Step two, construction of water lowering: light well point water lowering is performed at the water gushing area, a main pipe and a branch pipe are arranged in the foundation pit, the main pipe is connected with a water pump, and the water pump is started to perform water lowering construction; Step three, construction of the steel mesh isolation system of the water gushing area: after the water lowering construction is completed, an opening is formed on the bottom plate of the water gushing area, steel meshes are arranged on both sides of the water gushing position of the water gushing area, and the steel mesh isolation system of the water gushing area is installed; Step four, construction of the high-pressure grouting plugging system: the circular iron bucket is arranged at the water gushing position in the steel mesh, and a grouting pump is started to inject grouting into the circular iron bucket; Step five, construction of the bottom hole water stop plugging: a bottom slot opening is arranged on the bottom plate of the water gushing area, and plugging concrete is poured at the bottom slot opening to perform plugging and maintenance; Step six, completion of construction: after inspection and acceptance, the relevant equipment leaves the site.

[0011] As preferred, in step two, the foundation pit is supported by an inner support, the inner support is provided with a suspender, the other end of the suspender is provided with a main pipe fixing ring, the main pipe fixing ring is sleeved with a main pipe, the bottom of the main pipe is provided with a branch pipe, and the bottom of the branch pipe is provided with a filter pipe; the main pipe is connected with a water suction pipe, the other end of the water suction pipe is connected with a water pump, and the water pump is placed on the bottom plate; the water lowering construction is performed by the water pump.

[0012] As a preferred embodiment, in step three, the steel mesh isolation system in the water inrush area includes bottom connecting bars and U-shaped fixing nails; the bottom connecting bars are connected to the bottom of the steel mesh and fixed to the soil with U-shaped fixing nails, and the upper part of the bottom connecting bars of the steel mesh is fixed to the bottom slab cushion layer with U-shaped fixing nails.

[0013] The beneficial effects of this invention are: 1) This invention uses a deep foundation pit vacuum lightweight wellpoint dewatering system for construction. It is simple to install, has a stable overall structure, has little impact on the surrounding environment, and has a good dewatering effect.

[0014] 2) This invention uses a steel mesh isolation system for water inrush areas during construction, which effectively prevents water flow from spreading and ensures the safety of construction personnel.

[0015] 3) This invention uses a high-pressure grouting sealing system for construction, which is easy to operate, has a good sealing effect, and improves construction efficiency.

[0016] 4) This invention uses a bottom slab opening water-stopping structure for construction. The structure is simple, reduces the impact on the existing structure, has a good sealing effect, and ensures the integrity of the bottom slab after sealing. Attached Figure Description

[0017] Figure 1 This is a front view of the structure of a deep foundation pit vacuum lightweight wellpoint dewatering system; Figure 2 This is a side view of the structure of a deep foundation pit vacuum lightweight wellpoint dewatering system; Figure 3 This is a schematic diagram of the steel plate mesh isolation system structure in the water inrush area; Figure 4 This is a front view of the high-pressure grouting sealing system structure; Figure 5 This is a top view of the high-pressure grouting sealing system structure; Figure 6 This is a schematic diagram of the water-stopping and sealing structure for the opening in the base slab.

[0018] Explanation of reference numerals in the attached drawings: 1-Foundation pit, 2-Internal support, 3-Water inrush area, 4-Bottom slab, 5-Hanging rod, 6-Main pipe fixing ring, 7-Main pipe, 8-Branch pipe, 9-Filter pipe, 10-Pumping pipe, 11-Pumping pump, 12-Bottom slab cushion layer, 13-Water inrush, 14-Steel mesh, 15-Bottom connecting reinforcement, 16-U-shaped fixing reinforcement, 17-Circular iron barrel, 18-Iron barrel cover, 19-Embedded sleeve, 20-Cover pressure rod, 21-Grouting hole, 22-Grouting pipe, 23-Waterproof layer, 24-Bottom slab opening groove, 25-Bottom slab reinforcement, 26-Waterstop plate, 27-Sealing concrete. Detailed Implementation

[0019] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0020] Example 1 As one embodiment, a comprehensive treatment system for high-pressure grouting to seal water inrush at the bottom of deep foundation pits is proposed, such as... Figures 1-6 As shown, the system includes a deep foundation pit vacuum lightweight wellpoint dewatering system, a steel mesh isolation system for the water inrush area, a high-pressure grouting sealing system, and a bottom slab opening water-stopping structure. The foundation pit 1 has a bottom slab 4 at its bottom, with a water inrush area 3 below it. Water 13 flows into the water inrush area 3. A bottom slab cushion layer 12 is placed below the bottom slab 4. The deep foundation pit vacuum lightweight wellpoint dewatering system includes an internal support 2, a main pipe 7, and branch pipes 8. The internal support 2 is placed inside the foundation pit 1, and the main pipe 7 and branch pipes 8 are suspended at the bottom of the internal support 2. A water pump 11 is connected to the main pipe 7. The steel mesh isolation system for the water inrush area includes a steel mesh 14, which is placed on the side wall of the water inrush area 3. The high-pressure grouting sealing system includes a circular iron barrel 17, which is installed inside the foundation pit 1. The bottom slab opening water-stopping structure includes a bottom slab slot 24, which is located on the bottom slab 4.

[0021] like Figure 1 and Figure 2 As shown, the deep foundation pit vacuum lightweight wellpoint dewatering system includes an internal support 2, a water inrush zone 3, a hanger 5, a main pipe fixing ring 6, a main pipe 7, branch pipes 8, a filter pipe 9, a pumping pipe 10, and a pumping pump 11. The internal support 2 is installed inside the foundation pit 1. The water inrush zone 3 is located below the bottom plate 4. The upper end of the hanger 5 is fixed to the internal support 2. The main pipe fixing ring 6 is installed at the lower end of the hanger 5. The main pipe 7 is fixed to the main pipe fixing ring 6. The multiple branch pipes 8 are connected to the main pipe 7. The filter pipe 9 is installed at the bottom of the branch pipe 8. One end of the pumping pipe 10 is connected to the main pipe 7, and the other end is connected to the pumping pump 11. The pumping pump 11 is placed on the bottom plate 4.

[0022] like Figure 3 As shown, it also includes a steel plate mesh isolation system for the water inrush area. The steel plate mesh isolation system for the water inrush area includes a base plate cushion layer 12, a water inrush 13, a steel plate mesh 14, bottom connecting bars 15, and U-shaped fixing nails 16. The base plate cushion layer 12 is located at the bottom of the base plate 4. The water inrush 13 is located in the water inrush area 3. The steel plate mesh 14 is located at the water inrush area 3. The bottom connecting bars 15 are connected to the bottom of the steel plate mesh 14. The U-shaped fixing nails 16 fix the bottom connecting bars 15 to the soil and the upper part of the steel plate mesh 14 to the base plate cushion layer 12.

[0023] like Figure 4 and Figure 5As shown, it also includes a high-pressure grouting sealing system, which includes a circular iron barrel 17, an iron barrel cover 18, a pre-embedded sleeve 19, a cover pressure rod 20, grouting holes 21, and grouting pipes 22. The circular iron barrel 17 is set at the water inflow point 13 inside the steel mesh 14. The iron barrel cover 18 is set at the top of the circular iron barrel 17. The pre-embedded sleeve 19 is set inside the bottom plate cushion layer 12. The cover pressure rod 20 is set on the upper part of the iron barrel cover 18 and fixed at both ends inside the pre-embedded sleeve 19. The multiple grouting holes 21 are set on the iron barrel cover 18, and the multiple grouting pipes 22 are set inside the grouting holes 21.

[0024] like Figure 6 As shown, it also includes a water-stopping structure for the bottom slab opening. The water-stopping structure for the bottom slab opening includes a waterproof layer 23, a bottom slab groove 24, bottom slab reinforcement 25, a water-stop plate 26, and sealing concrete 27. The waterproof layer 23 is set on the bottom slab pad 12 at the bottom slab groove 24. The bottom slab groove 24 is set on the bottom slab 4 of the water inrush area 3. The bottom slab reinforcement 25 is set at the bottom slab groove 24. The water-stop plate 26 is set on the bottom slab reinforcement 25. The sealing concrete 27 is poured at the bottom slab groove 24.

[0025] Example 2 As another embodiment, this second embodiment, based on the first embodiment, proposes a construction method for a comprehensive treatment system for high-pressure grouting to seal water inrush at the bottom of a deep foundation pit, such as... Figures 1-6 As shown, it includes the following steps: Step 1, Construction Preparation: Provide technical briefings to on-site technical personnel, ensure they are familiar with the construction process, and bring relevant materials and equipment to the site.

[0026] Step 2, Dewatering Construction: Light wellpoint dewatering is carried out at 3 locations in the water inrush area. Hangers 5 are installed on the inner support 2 of the foundation pit 1. A main pipe fixing ring 6 is installed at the lower end of the hangers 5. The main pipe 7 is fixed on the main pipe fixing ring 6. Multiple branch pipes 8 are connected to the main pipe 7. Filter pipes 9 are installed at the bottom of the branch pipes 8. One end of the pumping pipe 10 is connected to the main pipe 7, and the other end is connected to the pumping pump 11. The pumping pump 11 is placed on the base plate 11, and the pumping pump 11 is turned on to carry out dewatering construction.

[0027] Step 3, steel mesh isolation construction in the water inrush area: After the dewatering construction is completed, an opening is made in the bottom plate 4 of the water inrush area 3, and steel mesh 14 is installed at the water inrush 13 in the water inrush area 3. The bottom connecting bar 15 is connected to the bottom of the steel mesh 14 and fixed to the soil with U-shaped fixing nails 16. The upper part of the bottom connecting bar 15 and the steel mesh 14 is fixed to the bottom plate cushion layer 12 with U-shaped fixing nails 16.

[0028] Step 4, High-pressure grouting and sealing construction: A circular iron barrel 17 is placed inside the steel mesh 14 at the water inrush point 13. The iron barrel cover 18 is placed on top of the circular iron barrel 17. The pre-embedded sleeve 19 is placed inside the bottom slab cushion layer 12. The cover pressure rod 20 is placed on the upper part of the iron barrel cover 18 and fixed at both ends inside the pre-embedded sleeve 19. Multiple grouting holes 21 are placed on the iron barrel cover 18, and multiple grouting pipes 22 are placed inside the grouting holes 21. The grouting pump is turned on to carry out grouting construction through the grouting pipes 22.

[0029] Step 5, Waterproofing and sealing of the opening in the base slab: The waterproof layer 23 is placed on the base slab pad 12 at the opening 24 in the base slab. The opening 24 in the base slab is placed on the base slab 4 in the water inrush area 3. The base slab reinforcement 25 is installed at the opening 24 in the base slab, and the waterstop 26 is installed on the base slab reinforcement 25. The sealing concrete 27 is poured at the opening 24 in the base slab for sealing and curing.

[0030] Step Six, Construction Completed: After inspection and acceptance, the relevant equipment is removed from the site.

[0031] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0032] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A comprehensive treatment system for high-pressure grouting to seal water inrush at the bottom of deep foundation pits, characterized in that, The system includes a deep foundation pit vacuum lightweight wellpoint dewatering system, a steel mesh isolation system for the water inrush area, a high-pressure grouting sealing system, and a bottom slab opening water-stopping structure. The foundation pit has a bottom slab with a water inrush area beneath it. Water flows within the water inrush area. A bottom slab cushion layer is placed beneath the bottom slab. The deep foundation pit vacuum lightweight wellpoint dewatering system includes internal supports, a main pipe, and branch pipes. The internal supports are installed inside the foundation pit, and the main pipe and branch pipes are suspended from the bottom of the internal supports. A water pump is connected to the main pipe. The steel mesh isolation system for the water inrush area includes steel mesh installed on the sidewalls of the water inrush area. The high-pressure grouting sealing system includes a circular iron barrel installed inside the foundation pit. The bottom slab opening water-stopping structure includes a slotted opening in the bottom slab.

2. The comprehensive treatment system for high-pressure grouting and sealing of water inrush at the bottom slab of deep foundation pits according to claim 1, characterized in that, The deep foundation pit vacuum lightweight wellpoint dewatering system includes a boom, a pumping pipe, and a pump. The upper end of the boom is fixed to the inner support, and the lower end of the boom is equipped with a main pipe fixing ring, which fixes the main pipe. Multiple branch pipes are connected to the bottom of the main pipe, and filter pipes are installed at the bottom of the branch pipes. The pump is placed on the base plate outside the water inrush area. One end of the pumping pipe is connected to the main pipe, and the other end is connected to the pump.

3. The comprehensive treatment system for high-pressure grouting and sealing of water inrush at the bottom slab of deep foundation pits according to claim 1, characterized in that, The steel mesh isolation system for the water inrush area includes a base slab and U-shaped fixing nails. The bottom of the steel mesh is connected to a bottom connecting bar, and the U-shaped fixing nails are fixed to the bottom connecting bar, the bottom soil of the water inrush area, and the upper part of the steel mesh and the base slab.

4. The comprehensive treatment system for high-pressure grouting and sealing of water inrush at the bottom slab of deep foundation pits according to claim 1, characterized in that, The high-pressure grouting sealing system includes a circular iron barrel and a capping rod; the circular iron barrel is placed at the water inflow point inside the steel mesh, and the top of the circular iron barrel is equipped with an iron barrel cap; a pre-embedded sleeve is installed in the bottom slab cushion layer; the capping rod is set on the upper part of the iron barrel cap, and both ends of the capping rod are fixed in the pre-embedded sleeve; the iron barrel cap is provided with multiple grouting holes, and grouting pipes are installed in the grouting holes.

5. The comprehensive treatment system for high-pressure grouting and sealing of water inrush at the bottom slab of deep foundation pits according to claim 1, characterized in that, The water-stopping structure for the opening in the base slab includes a waterproof layer, base slab reinforcement, and sealing concrete. The opening in the base slab is located inside the base slab in the water inrush area. The waterproof layer is placed on the base slab cushion layer at the opening in the base slab. The base slab reinforcement is installed inside the opening in the base slab. A water-stop plate is installed on the base slab reinforcement. The sealing concrete is poured inside the opening in the base slab.

6. A construction method for a comprehensive treatment system for high-pressure grouting and sealing of water inrush at the bottom slab of a deep foundation pit as described in claim 1, characterized in that, Includes the following steps: Step 1: Construction Preparation: Relevant materials and equipment arrive on site; Step 2, Dewatering Construction: Light wellpoint dewatering is carried out in the water inrush area. A main pipe and branch pipes are installed in the foundation pit. The main pipe is connected to a water pump, and the water pump is turned on to carry out dewatering construction. Step 3: Steel mesh isolation construction in the water inrush area: After the dewatering construction is completed, an opening is made in the bottom slab of the water inrush area, and steel mesh is installed on both sides of the water inrush point to complete the steel mesh isolation system for the water inrush area; Step 4: High-pressure grouting and sealing construction: A circular iron bucket is placed inside the steel mesh at the water inflow point, and the grouting pump is turned on to inject grout into the circular iron bucket; Step 5: Waterproofing and sealing of the opening in the bottom slab: Set a groove in the bottom slab in the water inrush area, pour sealing concrete at the groove, and cure it. Step Six: Construction Completion: After inspection and acceptance, the relevant equipment is removed from the site.

7. The construction method of the comprehensive treatment system for high-pressure grouting and sealing of water inrush at the bottom slab of deep foundation pits according to claim 6, characterized in that, In step two, the foundation pit is supported by internal supports, and the internal supports are equipped with hangers. A main pipe fixing ring is installed at the other end of the hangers, and the main pipe is fitted with the main pipe. A branch pipe is installed at the bottom of the main pipe, and a filter pipe is installed at the bottom of the branch pipe. The main pipe is connected to a pumping pipe, and the other end of the pumping pipe is connected to a pumping pump, which is placed on the bottom plate. Dewatering is carried out by pumping water.

8. The construction method of the comprehensive treatment system for high-pressure grouting and sealing of water inrush at the bottom slab of deep foundation pits according to claim 6, characterized in that, In step three, the steel mesh isolation system in the water inrush area includes bottom connecting bars and U-shaped fixing nails; the bottom connecting bars are connected to the bottom of the steel mesh and fixed to the soil with U-shaped fixing nails, and the upper part of the bottom connecting bars of the steel mesh is fixed to the bottom slab cushion layer with U-shaped fixing nails.

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