CN110820720A - A kind of construction structure and method for blocking drainage and anti-floating - Google Patents

Abstract

The invention relates to the technical field of construction engineering, in particular to a construction structure for water resistance and anti-floating; the adopted technical scheme is: a construction structure for water resistance and anti-floating, comprising a plain concrete layer, and the plain concrete layer is laid on a fertilizer trough A protective layer, a graded gravel layer, and a fluidized solidified soil layer are laid on the plain concrete layer in sequence; a water filter pipe is embedded in the graded gravel layer, and the water filter pipe is provided with a number of water inlet holes. The water filter pipe is used to lead the water in the fertilizer tank out of the fertilizer tank. The invention can cut off the connection between the seepage water on the surface and the groundwater, so as to prevent the water pressure of the groundwater from increasing. At the same time, a graded gravel layer is laid between the protective layer and the fluidized solidified layer, and a water filter pipe is buried in the graded gravel layer to filter the groundwater infiltrating and upwelling from the surface, so as to drain the underground water of the building. The buoyancy of the foundation is released, which greatly reduces the buoyancy of the underground foundation of the building and plays the role of anti-floating and decompression. It has the characteristics of low construction cost and short construction period.

Description

A kind of construction structure and method for blocking drainage and anti-floating

technical field

The invention relates to the technical field of construction engineering, in particular to a construction structure and method for resisting drainage and floating.

Background technique

The backfill construction of construction projects has an important impact on the construction quality of the foundation. According to relevant researches, the ground subsidence caused by the construction quality defect of backfill in the construction of housing construction projects accounts for about 90% of the ground subsidence. In the backfill construction of construction projects, the quality control of the backfill is generally not strict, resulting in that the moisture content and dry density of the soil layer after the backfill construction does not meet the specifications, and it is easy to form rubber soil after filling. In addition, due to the lack of supporting ramming methods or the inability to use effective equipment for ramming and filling in a large number of narrow areas during the backfill construction of the project, it is customary to loosely fill once and then perform surface leveling and compaction during construction. It did not meet the relevant design requirements, which brought great difficulties to the follow-up rectification. There is no better way to solve the above problems, and it often consumes a lot of manual compaction and a long technical interval.

In addition, due to the abundance of groundwater, some projects often pose hidden dangers to structural quality and safety due to excessive buoyancy. In view of the above problems, the construction method that is widely used is anti-floating anchor construction, which requires anti-floating anchors to be anchored in hard rock mass, not suitable for soft rock and soil, and the damage is often the damage of anchored rock mass; It is relatively dense, and the construction of anchor rods is inconvenient; Therefore, the construction process of the anti-floating anchor rod is complicated, the construction cost is high, and the construction period is long.

SUMMARY OF THE INVENTION

Aiming at the above-mentioned technical problems of complex backfilling construction procedures, high investment, long construction period, and large groundwater buoyancy for buildings in existing construction projects, the present invention provides a construction structure and construction method for resisting drainage and anti-floating, which can reduce the water resistance of basements. The anti-seepage and anti-floating pressure of the slab has the characteristics of simple construction, short construction period, low cost, low anti-floating pressure and high safety factor of the engineering structure.

The present invention is achieved through the following technical solutions:

A water-blocking and anti-floating construction structure, comprising a plain concrete layer, which is laid on the bottom of a fertilizer trough; a protective layer, a graded gravel layer, and a fluidized solidified soil layer are sequentially laid on the plain concrete layer; A water filter pipe is embedded in the graded crushed stone layer, the water filter pipe is provided with a plurality of water inlet holes, and the water filter pipe is used to lead the water in the fertilizer tank out of the fertilizer tank.

The invention cuts off the connection between the seepage water on the surface and the groundwater through the plain concrete layer, the protective layer and the fluidized solidified soil layer, so as to prevent the water pressure of the groundwater from increasing. At the same time, a graded gravel layer is laid between the protective layer and the fluidized solidified layer, and a water filter pipe is buried in the graded gravel layer to filter the groundwater infiltrated and upwelling from the surface, so as to drain the underground water of the building. The buoyancy of the foundation is released, which greatly reduces the buoyancy of the underground foundation of the building and plays the role of anti-floating and decompression.

As a specific embodiment of the graded gravel layer, the graded gravel layer includes a first graded gravel layer and a second graded gravel layer, and the water filter pipe is located in the first graded gravel layer and the second graded gravel layer. Graded gravel between layers. On the one hand, it is convenient for the burying of the water filter pipe, and on the other hand, it can ensure that the upper and lower sides of the water filter pipe have enough graded gravel to filter out the impurities in the water infiltrated into the structure.

As a specific embodiment of the protective layer, the protective layer includes a concrete layer on which a waterproof layer is laid.

Further, a geotextile layer is laid between the graded gravel layer and the fluidized solidified soil layer to prevent groundwater from rising up to the fluidized solidified soil layer and to prevent the fluidized solidified soil from entering the graded gravel layer.

As a specific embodiment of the water filter pipe, the opening rate of the water filter pipe is greater than 16%, which ensures that the water filter pipe has sufficient structural strength and water passing capacity.

Further, the side wall of the foundation outer wall of the fertilizer tank is provided with a waterproof layer to prevent the water in the fertilizer tank from infiltrating into the underground foundation of the building from the foundation outer wall.

Preferably, the side slope of the fertilizer trough is provided with a waterproof layer to prevent the water around the underground foundation of the building from entering the fertilizer trough.

The present invention also provides a construction method for water resistance and anti-floating, which is used to build the above-mentioned construction structure for water resistance and floating, including the following steps:

Lay waterproof layers at the bottom and both sides of the fertilizer trough, and pour plain concrete at the bottom of the fertilizer trough construction area;

Lay concrete and waterproof layer in sequence on plain concrete to build protective layer;

Lay a graded gravel layer on the protective layer, and lay a water filter pipe on the graded gravel layer, so that the outlet end of the water filter pipe extends out of the outer wall of the fertilizer tank foundation;

After laying a geotextile layer on the graded gravel layer, laying fluidized solidified soil.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The present invention lays sequentially from the bottom of the fertilizer trough, plain concrete layer, protective layer, graded gravel layer, and fluidized solidified soil layer; The water filter pipe is provided with several water inlet holes. Through the plain concrete layer, the protective layer, and the fluidized solidified soil layer, the connection between the seepage water on the surface and the groundwater is cut off to prevent the increase of the groundwater pressure. At the same time, a graded gravel layer is laid between the protective layer and the fluidized solidified layer, and a water filter pipe is buried in the graded gravel layer to filter the groundwater infiltrated and upwelling from the surface, so as to drain the underground water of the building. The buoyancy of the foundation is released, which greatly reduces the buoyancy of the underground foundation of the building and plays the role of anti-floating and decompression.

2. Using fluidized solidified soil to backfill the fertilizer tank, the fluidized solidified soil can be quickly solidified, and after the fluidized solidified soil is solidified and hardened, the volume has the characteristics of relatively stable, dry shrinkage, and good water stability, avoiding the backfill soil subsidence and water content. Insufficient rate. Inadequate compaction and other disadvantages. Therefore, the present invention also improves the work efficiency, reduces the construction cost, and shortens the construction period. At the same time, the fluidized solidified soil can fill all the voids in the narrow space and the special-shaped structure space, without the need for large-scale compaction and rolling equipment during the construction, which effectively reduces the damage to the waterproof layer during the construction process.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the embodiments of the present invention, and constitute a part of the present application, and do not constitute limitations to the embodiments of the present invention. In the attached image:

FIG. 1 is a schematic structural diagram of the present invention.

The names of the parts in the attached drawings:

1- Plain concrete layer, 10- Fertilizer trough, 11- Foundation exterior wall, 2- Protection layer, 3- Gradation gravel layer, 31- First grade gravel layer, 32- Second grade gravel layer, 4- fluid solidified soil layer, 5- water filter pipe, 6- geotextile layer, 8- floor, 9- permanent sump.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. as a limitation of the present invention.

Example

A water-blocking and anti-floating construction structure includes a plain concrete layer 1 , and the plain concrete layer 1 is laid on the bottom of a fertilizer tank 10 . A protective layer 2 , a graded gravel layer 3 , and a fluidized solidified soil layer 4 are sequentially laid on the plain concrete layer 1 . It is known that a floor 8 is also laid on the fluidized solidified soil layer 4 . A water filter pipe 5 is embedded in the graded crushed stone layer 3 , the water filter pipe 5 is provided with a plurality of water inlet holes, and the water filter pipe 5 is used to lead the water in the fertilizer tank 10 out of the fertilizer tank 10 .

The invention cuts off the connection between the seepage water on the surface and the groundwater through the plain concrete layer 1, the protective layer 2, and the fluidized solidified soil layer 4, so as to prevent the water pressure of the groundwater from increasing. At the same time, a graded gravel layer 3 is laid between the protective layer 2 and the fluidized solidified layer 4, and a water filter pipe 5 is buried in the graded gravel layer 3, so as to filter the groundwater infiltrated and upwelled from the surface, and then pass through the filter. The water pipe 5 is discharged into the underground foundation of the building (usually the basement), thereby releasing the buoyancy of the underground foundation of the building, greatly reducing the buoyancy of the underground foundation of the building, and playing the role of anti-floating and decompression.

The traditional anti-floating anchor rods not only have high requirements on geological conditions and complicated construction, but also do not fundamentally solve the problem of groundwater buoyancy, but only fix the underground foundation of the building through anti-floating anchor rods. It is always under high pressure. If the groundwater buoyancy is further increased, there is a risk that the anchorage cannot be anchored; and the anchor rod is always under tension, and there is a risk of tensile stress damage.

It should be noted that fluidized solidified soil is a new type of backfill material. Its working performance is better than that of traditional backfill soil. In terms of strength, it can be adjusted between 0.5MPa and 10MPa according to actual needs to meet the strength of foundation backfill, foundation pit backfill and fertilizer tank backfill. The strength of the solidified soil increases relatively quickly, and the next construction can be carried out within 12 to 24 hours after the pouring is completed, which greatly saves the construction period. When mixing solidified soil, admixtures (main components are calcium oxide, activated alumina, silica) can also be added according to soil quality and design requirements to control the growth rate of its strength, and to change its strength and fluidity by adjusting the mixing ratio. After the solidification and hardening of fluidized soil, its volume is relatively stable, dry shrinkage, and water stability is good. Compared with natural backfill soil, it also has impermeability after solidification and hardening.

Therefore, using the fluidized solidified soil to backfill the fertilizer tank 10, the fluidized solidified soil can be quickly solidified, and after the fluidized solidified soil is solidified and hardened, the volume has the characteristics of relatively stable, dry shrinkage, and good water stability, which avoids the backfill soil subsidence and water content. Defects such as insufficient rate and insufficient compaction. Improve work efficiency, reduce construction costs, and shorten the construction period. At the same time, the fluidized solidified soil can fill all the voids in the narrow space and the special-shaped structure space, without the need for large-scale compaction and rolling equipment during the construction, which effectively reduces the damage to the waterproof layer during the construction process.

As a specific embodiment of the graded gravel layer 3 , the graded gravel layer 3 includes a first graded gravel layer 31 and a second graded gravel layer 32 , and the water filter pipe 5 is located in the first graded gravel layer 32 . Between the stone layer 31 and the second graded crushed stone layer 32 . On the one hand, it is convenient for the burying of the water filter pipe 5, and on the other hand, it can ensure that the upper and lower sides of the water filter pipe 5 have enough graded gravel to filter out impurities in the water infiltrated into the structure.

Among them, the first graded gravel layer 31 and the second graded gravel layer 32 are both laid with graded gravel of 20-30 mm, and the second graded gravel layer 32 is located in the first graded gravel layer 31 Above, and the thickness of the second graded crushed stone layer 32 is greater than 80 cm, and the thickness of the first graded crushed stone layer 31 is greater than 30 cm.

As a specific embodiment of the protective layer 2, the protective layer 2 includes a concrete layer on which a waterproof layer is laid. It can be understood that the concrete layer is laid above the plain concrete layer 1 to prevent the plain concrete layer 1 from being fractured, and the waterproof layer can prevent the water on the surface from seeping into the groundwater.

Further, a geotextile layer 6 is laid between the graded crushed stone layer 3 and the fluidized solidified soil layer 4 . In this embodiment, the geotextile layer 6 is laid with two layers of 400 g/m2 non-woven geotextile to prevent the groundwater from rising up to the fluidized solidified soil layer 4 . At the same time, it can also prevent the fluidized solidified soil from entering the graded crushed stone layer 3 during construction of the fluidized solidified soil layer 4 , thereby reducing the water filtration capacity of the graded crushed stone layer 3 .

As a specific embodiment of the water filter pipe 5, the opening rate of the water filter pipe 5 is greater than 16%, which ensures that the water filter pipe has sufficient structural strength and water-passing capacity. In this embodiment, DN150PVC is used as the water filter main pipe, and the diameter of the water inlet hole is larger than 10mm and less than 20cm, so as to ensure that the water in the graded gravel layer 3 can flow into the water filter pipe 5 by itself.

The water inlet holes are evenly distributed on the side wall of the water filter pipe 5, one end of the water filter pipe 5 is closed to prevent the gravel from entering the water filter pipe 5, and the other end of the water filter pipe 5 extends into the underground foundation of the building. The water discharged from the water pipe 5 is collected by a permanent water collecting pit 9 (the water collecting pit 9 is integrated with the building underground foundation) in the underground foundation of the building, which is convenient for centralized treatment.

Further, the side wall of the foundation outer wall 11 of the fertilizer tank 10 is provided with a waterproof layer to prevent the water in the fertilizer tank 10 from infiltrating into the underground foundation of the building from the foundation outer wall. It is preferable to use self-adhesive waterproof membrane for laying, so as to facilitate the laying of the waterproof layer and the falling during construction, which will affect the normal construction.

Preferably, the side walls of the side slope of the fertilizer tank 10 are provided with a waterproof layer to prevent the water around the underground foundation of the building from entering the fertilizer tank 10 .

The construction method of the water-blocking and anti-floating construction structure described in this embodiment includes the following steps:

S1. Lay an impermeable layer on the surface of the underground foundation foundation of the building, that is, lay an impermeable layer on the surface of the slope and the foundation surface. After the construction of the underground foundation of the building is completed to form a fertilizer trough, waterproofing is arranged on both side walls of the fertilizer trough. Floor.

S2. Determine the backfill construction area of the fertilizer trough, and pour a plain concrete layer at the bottom of the construction area.

S3. After the plain concrete layer is solidified, a concrete layer is poured thereon; after the concrete is solidified, a waterproof layer is laid to form a protective layer.

S4. Lay 20-30mm graded gravel with a thickness of more than 30cm above the protective layer, and lay out a water filter pipe after leveling.

S5. Continue to lay 20-30mm graded gravel until the gravel completely covers the water filter pipe before continuing to lay until the thickness of the graded gravel is greater than 110cm.

S6. Lay two layers of geotextile above the graded gravel layer.

S7. According to the backfill depth of the fertilizer tank, backfill the fluidized solidified soil in layers.

S8. After the fluidized solidified soil is solidified, the floor is laid.

The specific embodiments described above further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a water-repellent and anti-floating construction structure, characterized in that: comprising a plain concrete layer (1), and the plain concrete layer (1) is laid on the bottom of a fertilizer trough (10); A protective layer (2), a graded crushed stone layer (3), and a fluidized solidified soil layer (4) are sequentially laid on the plain concrete layer (1); A water filter pipe (5) is embedded in the graded crushed stone layer (3), the water filter pipe (5) is provided with a plurality of water inlet holes, and the water filter pipe (5) is used for draining the water in the fertilizer tank (10). The water is led out of the fertilizer tank (10). 2. The water-blocking and anti-floating construction structure according to claim 1, characterized in that: the graded gravel layer (3) comprises a first graded gravel layer (31), a second graded gravel layer ( 32), the water filter pipe (5) is located between the first graded gravel layer (31) and the second graded gravel layer (32). 3 . The construction structure for water resistance and anti-floating according to claim 1 , wherein the protective layer ( 2 ) comprises a concrete layer, and a waterproof layer is laid on the concrete layer. 4 . 4. The water-blocking and anti-floating construction structure according to claim 1, characterized in that: a geotextile layer (6) is laid between the graded gravel layer (3) and the fluidized solidified soil layer (4). 5. The water-blocking and anti-floating construction structure according to claim 1, wherein the opening rate of the water filter pipe (5) is greater than 16%. 6. The construction structure for water resistance and anti-floating according to claim 1, characterized in that: a waterproof layer is provided on the side wall of the foundation outer wall (11) of the fertilizer tank (10). 7 . The construction structure for water resistance and floating resistance according to claim 1 , wherein a waterproof layer is provided on the side slope side walls of the fertilizer trough ( 10 ). 8 . 8. A construction method for water resistance and anti-floating, for constructing the construction structure for water resistance and anti-floating according to any one of claims 1 to 7, characterized in that, comprising the following steps: Placing plain concrete at the bottom of the fertilizer trough construction area; Build a protective layer on plain concrete; Lay a graded gravel layer on the protective layer, and lay a water filter pipe on the graded gravel layer, so that the outlet end of the water filter pipe extends out of the outer wall of the fertilizer tank foundation; Lay fluidized solidified soil on the graded gravel layer. 9 . The construction method for water resistance and anti-floating according to claim 8 , wherein, before pouring plain concrete, a waterproof layer is arranged on the bottom and both sides of the fertilizer tank. 10 . 10. The construction method for water resistance and anti-floating according to claim 8 or 9, characterized in that a geotextile layer is laid on the graded gravel layer before laying the fluid fixed soil.

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