CN112095814A

CN112095814A - Waterproof treatment method for vault basement porous wall

Info

Publication number: CN112095814A
Application number: CN202010861551.2A
Authority: CN
Inventors: 李志芬; 周传勇
Original assignee: MCC5 Group Shanghai Corp Ltd
Current assignee: MCC5 Group Shanghai Corp Ltd
Priority date: 2020-08-25
Filing date: 2020-08-25
Publication date: 2020-12-18

Abstract

A waterproof treatment method for a porous wall of a vault basement is characterized by comprising the following steps: a. drilling a plurality of holes on a porous wall with soil lower than the ground level, b, inserting steel pipes into the holes, c, starting the high-voltage pulse injection device, d, repeating the steps (b) and (c), performing liquid injection operation, and forming a complete resin coating through the steps (b), (c) and (d); e. and (f) triggering and curing the resin, repeating the steps (a) to (e), performing grouting operation, and g, blocking all drilled holes in the wall, so as to finish the waterproof treatment of the porous wall of the vault basement. The waterproof treatment method for the porous wall of the vault basement has the advantages that the structures of the inner layer and the outer layer of the wall, the organic silicon resin barrier, the cement condensate and the water glass condensate are simple, the construction is convenient, the waterproof effect of the totally-enclosed buffer structure is safe and reliable, the method is economical and reasonable, and the engineering cost is reduced.

Description

Waterproof treatment method for vault basement porous wall

Technical Field

The invention relates to a method for making a porous concrete or masonry basement wall watertight, in particular to a waterproof treatment method for a vault basement porous wall.

Background

Concrete and masonry foundations, such as found in the basement of a building or in underground vaults (including, for example, utility power plants gathered in power distribution systems), are permeable and constantly permeable to water unless a water impermeable barrier is established inside or outside the wall to stop water penetration.

Seepage water into a basement or vault is often caused by foundation settlement. The foundation is set on top of the soil, supporting the weight of the entire superstructure. Some parts of the foundation may be weaker than others, with the result that the weight distribution is uneven, often forcing the walls apart, creating a wet inlet. Poor construction quality of walls or foundations is one cause of water ingress. Sometimes, the mortar used for the concrete block foundation is of insufficient grade, or the mortar cannot form a solid bond between the blocks, and water from the outside ground penetrates. Alternatively, where the foundation is solid concrete, it may be poured with a defective bond between the layers.

The leakage may be the result of excessive ground humidity. In areas with clay subsoil, high groundwater levels or other poor drainage conditions, groundwater exerts a great force to drive water through the pores of the walls. The traditional method for treating the water seepage of underground walls and/or foundations is to coat a layer of waterproof compound on the inner surface of the wall or the surface of a ground reservoir, and to coat the waterproof compound on the uncoated masonry or concrete.

Another method is to pour the emulsion solution directly to the ground right above the crack of the wall. The latex solution flows into the basement along the water, forms tiny channels to flow downwards and finally flows into the crack. It solidifies as it flows and is fully installed to fill the channels and cracks until they are completely closed.

When the floor to be treated is closed with a hard surface layer, such as a concrete walkway or drive or other surface treatment, a hole is drilled in the surface layer as close to the wall as possible, and then the latex solution is poured through the hole into the wall to find cracks in the wall, or a hole is drilled in the basement wall below the ground, into which hole a pipe long enough to contact the outside soil is inserted, and the latex solution is poured through the pipe into the outside wall. A repairer is then used to fill the hole in the wall.

Finally, a less convenient but durable method of remediation is to completely excavate the earth around the basement or vault's outer wall so that the wall is waterproof to the bottom. Here, the wall is coated with a waterproof mastic, then with several layers of asphalt, then with asphalt paper, and finally with a layer of asphalt paint, after which the excavated area is filled up and removed from the wall.

The above method is not completely satisfactory in waterproofing underground walls. The waterproofing compound applied to the interior walls eventually breaks down due to the loss of adhesion under the pressure of the seeping water from the outside. Latex solutions applied to the outside by gravity often do not cure well in wet soils and are essentially solutions whose success is difficult to determine.

Applying the asphalt coating on the outside requires excavation of the soil, and even after application, it may be dissolved by hydrocarbons, for example, may overflow from a tank truck near the wall. Asphalt also shrinks back when dry and alternate dry and wet exposure can crack, rendering the coating ineffective.

Chinese patent CN107190783A discloses a basement waterproof structure and a construction method of the basement outer wall waterproof structure in 2017, 9/22, wherein the basement includes a foundation slab, a basement wall and a basement top slab, the basement wall is provided with a wall-through conduit, the basement wall includes a guide wall and a basement outer wall, a construction seam between the guide wall and the basement outer wall is connected and fixed through a water-stop steel plate, a cement gel layer and a cross membrane waterproof layer are sequentially arranged on the peripheries of the basement outer wall and the basement top slab from inside to outside, an additional cross membrane waterproof layer ii is arranged in the cross membrane waterproof layer at the internal corner position between the wall-through conduit and the basement wall, and the cross membrane waterproof layer and the tail end of the additional cross membrane waterproof layer ii are fixed with the wall-through conduit through a metal hoop and are coated with polyurethane to seal. According to the technical scheme, the water-stopping steel plate and the crossed membrane at the internal corner position are adopted for water prevention, so that a certain waterproof effect can be achieved, but the whole basement wall body can permeate water substantially, and the real waterproof effect is not large.

Therefore, the known waterproof treatment method for the porous wall of the vault basement has various inconveniences and problems.

Disclosure of Invention

The invention aims to provide a safe and reliable waterproof treatment method for a porous wall of a vault basement.

In order to achieve the purpose, the technical solution of the invention is as follows:

a waterproof treatment method for a porous wall of a vault basement is characterized by comprising the following steps:

a. drilling a plurality of holes on the porous wall of the vault basement with the soil lower than the ground level, so that the holes enter the soil on the other side of the basement wall and the same holes are formed in the soil;

b. inserting a steel pipe into the hole to enable the steel pipe to enter the soil drilling hole, wherein the end head of the steel pipe is configured into a nozzle opening, and the steel pipe is connected to a high-pressure pulse injection device arranged in an underground chamber;

c. starting the high-pressure pulse injection device, injecting liquid by the high-pressure pulse injection device in a pulse mode, enabling the steel pipe to radially retreat from the far end to the near end on the outer side of the basement wall along the axis of the steel pipe, and injecting the liquid, wherein the liquid is organic silicon resin, and the organic silicon resin is injected into soil by the pulse which is radially injected from the outside to the back through a nozzle opening to perform liquid injection operation;

d. repeating steps (b) and (c), and performing the liquid injection operation on all the holes in the same manner, so as to form a complete resin coating on the side of the wall adjacent to the soil through steps (b), (c) and (d);

e. subjecting said resin coating to a wet state, and trigger curing of the resin to adhere a water impermeable flexible barrier to said wall;

f. repeating the steps (a) to (e), performing grouting operation on all the holes in the same mode, wherein grouting slurry materials are cement and water glass, namely grouting is used for replacing injection, the specific operation method is the same, and after grouting is finished, an inner-layer structure and an outer-layer structure of a wall, an organic silicon resin barrier, cement and a water glass condensate are formed;

g. and plugging all drilled holes in the wall to finish the waterproof treatment of the porous wall of the vault basement.

The waterproof treatment method for the porous wall of the vault basement can be further realized by adopting the following technical measures.

The method, wherein the holes are regularly distributed in the basement wall in a row.

The method of the foregoing, wherein the silicone resin is a moisture-triggered, room temperature-curable, pourable, self-leveling dimethylpolysiloxane or a dialkylpolysiloxane.

In the above method, in the cement and water glass double-fluid grouting, the cement is cement: water = 1: 1 (weight ratio); the concentration of the water glass is 30-50 Baume degrees.

After the technical scheme is adopted, the waterproof treatment method for the porous wall of the vault basement has the following advantages:

1. the inner and outer three-layer structure of the wall, the organic silicon resin barrier, the cement and the water glass condensate is simple and convenient to construct;

2. the waterproof effect of the totally-enclosed buffer structure is safe and reliable;

3. economical and reasonable, and reduces the engineering cost.

Drawings

Fig. 1 is a schematic view of a waterproof structure of a porous wall of a vault basement according to an embodiment of the invention.

Detailed Description

The present invention will be further described with reference to the following examples and the accompanying drawings.

Example 1

Referring to fig. 1, fig. 1 is a schematic view of a waterproof structure of a porous wall of a vault basement according to an embodiment of the invention. As shown, the high pressure eductor 20 is located within the vault basement 12. The high pressure pulse injector 20 comprises a nozzle 21 connected to a cylinder 22, the cylinder 22 containing a piston 23, the piston 23 being located in a piston cavity 27, the piston cavity 27 being connected by

gas lines

24, 25, the gas lines being connected to a high pressure gas source 22 by a switch 26. The nozzle 21 is provided with a retractable nozzle orifice 31, the nozzle orifice 31 being arranged to spray the liquid in a circular discharge pattern with the nozzle 21 as the axis and towards the nozzle 21.

The waterproof treatment method of the porous wall of the vault basement comprises two aspects, wherein the first aspect is liquid injection, and the liquid injection material is silicon rubber which is dimethyl polysiloxane or dialkyl polysiloxane. Secondly, grouting, wherein the grouting material is cement and water glass double-liquid grouting material, and the cement is cement: water = 1: 1 weight ratio; the concentration of the water glass is 30-50 Baume degrees.

In the liquid filling operation of the waterproofing treatment method for porous walls of vaulted basements according to the present invention, the chamber 27 near the steel pipe at the end of the nozzle 21 is also entered through a feeding pipe 28 controlled by a valve 29. The feed line 28 communicates with a holding tank 30 that stores poured, self-leveling, moisture activated, room temperature cured silica gel.

In operation of the method of the invention, a high pressure jet 20 is inserted into one of the

holes

14, 15, 16, 17 and 18 and into a soil hole 19 in the adjacent soil 13, whereby the jet pipe is arranged at a distance between the soil 13 and the wall 10 to provide a circular resin back-jet pattern having a diameter greater than the distance between the hole and any hole adjacent thereto. To apply the resin, the valve controlling the entrance of the tubular passage of the steel pipe 21 is switched closed, and the shutter 26 is used to introduce air into the chamber 27 while discharging the air through the piping 25, thereby causing the shutter 23 to contract. The gate 26 is then rotated to vent the stack 24 to atmosphere, the valve 29 is opened and the pump p pumps resin from the reservoir 30 through the feed tube 28 into the chamber 27 until the resin is full. Then the valve controlling the entrance of the steel pipe passage is opened and the valve 29 is closed.

The nozzle 21 sprays the resin out of the chamber 27 and through the receding nozzle 31, through the pores of the soil 13, generally in a circular manner to the grounded side of the wall 10. The resin was released at high speed and a single pulse of 250 ml. It is to be understood that this effect is not at a fixed rate. At this rate, the flowable, self-leveling silicone rubber penetrates the soil pores conically toward the outer surface of the wall 10 and is depicted as a generally annular resin coating centered on the approximate axis of insertion into the nozzle bore. This process is then repeated at each hole, and flowable silicone is applied through the soil to the ground side of the wall, in the selected sequence, through the pattern of each hole, until the resin coating is completely applied to the wall.

In the liquid injection operation of the waterproof treatment method for the porous wall of the vault basement, dimethyl polysiloxane or dialkyl polysiloxane is used. Resins suitable for this application also include portable/self-leveling standard grade rtv112 and rtv118 silicone rubber adhesive sealants of the general electric company silicone rubber products division, or dow corning silicone rubber.

These flowable resins form tough, durable elastomeric silicone rubbers when exposed to the atmosphere at room temperature and flow out of the surface or self-level, filling surface discontinuities and depressions, providing a uniform coating that, when cured, will have a hardness of about 25, a tensile strength of about 2411.50KPa, and an elongation of about 350%.

Resin is projected to the soil side of the wall 10 and subjected to a moisture-retaining treatment to activate the curing of the resin, thereby coating the water on the wall and the water on the surface soil. When the silicon rubber barrier is adhered to a wall body after being cured, the elastic property of the silicon rubber barrier can adapt to the displacement of the wall body caused by soil movement and the like. Due to the barrier properties of the coating, hydrostatic pressure from high water levels and other door drainage conditions forces the coating against the wall, rather than away from the wall as in the case of the coating, which is applied to the interior wall surface of the vault 12.

After the resin paint is applied to the ground side of the wall body 10, all holes drilled in the wall body are blocked, and a non-porous material is preferably used.

The second step of the waterproof treatment method of the porous wall of the vault basement is grouting. On the basis of different proportions of cement-water glass grout in grouting, different gelling time under different temperature conditions and compressive strength of grout stone bodies, the proportion of the cement-water glass grout, grouting pressure and grout diffusion are ensured to be uniformly and sufficiently injected by pressure through a field grouting test, stratum disturbance is prevented, the stratum loss rate is reduced, and various grouting construction parameters are correspondingly adjusted by combining with real-time monitoring data.

The waterproof treatment method for the porous wall of the vault basement has the advantages that the waterproof treatment method adopts three-layer structures of the wall, the organic silicon resin barrier, the cement and the water glass condensate, the structure is simple, the construction is convenient, the waterproof effect of the totally-enclosed buffer structure is safe and reliable, the economic and reasonable effects are achieved, and the engineering cost is reduced.

The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.

Claims

1. A waterproof treatment method for a porous wall of a vault basement is characterized by comprising the following steps:

2. The method for waterproofing a porous wall of an arch-type basement according to claim 1, wherein the holes are regularly distributed in the basement wall in a row.

3. The method of claim 1, wherein the silicone resin is a moisture-triggered, room temperature-curable, pourable, self-leveling dimethylpolysiloxane or a dialkylpolysiloxane.

4. The waterproof treatment method for the porous wall of the vault basement as claimed in claim 1, wherein in the cement and water glass double-liquid grouting, cement is selected from the group consisting of cement: water = 1: 1 weight ratio; the concentration of the water glass is 30-50 Baume degrees.