CN217580092U - Novel pile foundation suitable for soft soil foundation treatment - Google Patents

Abstract

The utility model discloses a novel pile foundation suitable for soft soil foundation handles belongs to soft soil foundation and handles technical field. The utility model discloses a steel-pipe pile follows the inboard annular of steel-pipe pile is provided with concrete canvas, and concrete canvas is fold condition, and the axis direction of folding limit and steel-pipe pile is parallel, concrete canvas's inboard is provided with the mixture of sodium bentonite and quick lime, the steel-pipe pile bottom is provided with the stake point. The utility model discloses need not assault reaming or put in hole material, the pile body under the dry condition is directly impressed the soft soil foundation, need not other operations, and pile body self will absorb water the inflation, and the sclerosis becomes the stake, and it is convenient to be under construction, and low cost is applicable to the soft soil foundation of industry factory building, general civil construction etc. and handles.

Description

Novel pile foundation suitable for soft soil foundation treatment

Technical Field

The utility model belongs to the technical field of the soft soil foundation is handled, concretely relates to novel pile foundation suitable for soft soil foundation is handled.

Background

The soft soil foundation refers to a soft soil layer with low strength and high compression amount, and most of the soft soil layer contains certain organic substances. Because the soft soil has low strength and large sinking and hiding amount, great harm is often brought to road engineering, and if the treatment is improper, great influence is caused to the construction and the use of a road. The current common soft soil foundation treatment methods comprise:

replacement and replacement method: a replacement method can be selected for a thinner soil layer, the method is only suitable for a thin-layer soft soil foundation and is convenient for taking soil near a project, otherwise, the cost is higher;

vacuum preloading method: when the water content is higher and the requirement on the bearing capacity of the foundation soil is higher, a vacuum preloading method can be selected, but the method has limited treatment depth and is generally suitable for silt and mucky soil foundations with the thickness not more than 8-10 meters;

a stacking preloading method: when the requirement on the construction period is low and the field is large, a preloading method can be selected, but the construction period of the method is too long, and the project with the tight construction period is not suitable;

CFG pile method: the water content of the foundation is in a certain range, and a CFG pile method can be adopted, has certain requirements on the water content of the foundation, and is not economical due to silt or mucky soil.

In addition, there are a riprap sludge squeezing method, a high-pressure jet grouting method, a powder jet piling method, and the like, and the application range of these methods has its limitations. Therefore, the soft soil foundation treatment method which can shorten the construction period, is convenient to construct and low in cost is provided.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a novel pile foundation suitable for soft soil foundation treatment, its aim at: the construction period is shortened, the construction process is simplified, and the construction cost is reduced.

The utility model adopts the technical scheme as follows:

the utility model provides a novel pile foundation suitable for soft soil foundation is handled, includes the steel-pipe pile, follows the inboard annular of steel-pipe pile is provided with concrete canvas, concrete canvas's inboard is provided with water inflation filler, steel-pipe pile bottom is provided with the stake point, concrete canvas is fold condition, and the axis direction of folding limit and steel-pipe pile is parallel, concrete canvas's two sides is woven by the material that permeates water and is formed.

After the technical scheme is adopted, the pile body in the steel pipe pile in the dry state sinks through the pile pressing machine, the steel pipe pile is pulled up after the target depth is reached, and the pile body in the dry state is left in the soil body. The water-swellable filler expands horizontally after absorbing water, the concrete canvas in a peripheral folded state is unfolded under the action of horizontal stress generated by water swelling of the mixed material, and after a certain time, the pile body is hardened to form a pile body with certain strength and provide bearing capacity for the pile body; meanwhile, horizontal additional stress generated in the expansion process acts on the soil body, the water content of soil between piles is reduced, the drainage and consolidation of the soil body are further accelerated, and the bearing capacity of the soil between piles is provided. The effect of make full use of stake and stake soil improves foundation bearing capacity. The water in the soil body can penetrate through the concrete canvas to contact with the water-swelling filler, so that the water-swelling filler is swelled, the concrete canvas can not block water to move towards the internal mixture before hardening is completed, a circle of concrete thin wall is formed after hardening, and the water-locking effect is realized, so that the internal mixture is prevented from being dehydrated and shrunk.

Preferably, the pile tip is a valve pile tip or a concrete pile tip.

After adopting this preferred scheme, through valve stake point or concrete pile point, the steel-pipe pile that can be convenient for sinks, and it gets into inside the steel-pipe pile to prevent to sink in-process earth.

Preferably, the valve pile tip is detachably connected with the lower end of the steel pipe pile.

After the preferred scheme is adopted, the valve pile tip and the steel pipe pile can be conveniently detached.

Preferably, the concrete pile tip is movably connected with the lower end of the steel pipe pile.

After the preferable scheme is adopted, the steel pipe pile and the pile tip are conveniently separated after pile sinking construction.

Preferably, the water-swellable filler is a mixture of sodium bentonite and quicklime.

After the preferable scheme is adopted, the mixture of the sodium bentonite and the quicklime absorbs water and expands horizontally, and after a certain time, the pile body is hardened to form a pile body with a certain strength and provide the bearing capacity of the pile body; meanwhile, horizontal additional stress generated in the expansion process acts on the soil body, the water content of soil between piles is reduced, the drainage consolidation of the soil body is accelerated, and the bearing capacity of the soil between piles is improved.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. the construction period is short: the pile body in a dry state is directly pressed into a soft soil foundation (especially silt and mucky soil with larger water content) without impacting hole expanding or feeding hole materials, and the pile body absorbs water and expands without other operations, so that the pile is hardened and formed;

2. construction is convenient: no bulk hole material is stacked, and the dry pile body can be manufactured in a workshop and directly constructed on site;

3. economy: compared with cement concrete, the sodium bentonite and the quicklime have low price and can reduce the construction cost.

Drawings

The invention will be described by way of example and with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic cross-sectional view of a pile body before water absorption and hardening;

FIG. 3 is a schematic cross-sectional view of the pile body after water absorption and hardening;

FIG. 4 is a schematic construction flow diagram.

Reference numerals are as follows: 1-steel pipe pile, 2-concrete canvas, 3-mixture of sodium bentonite and quicklime, and 4-pile tip.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that a product of the present invention is usually placed in when used, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

The following describes the present invention in detail with reference to fig. 1 to 4.

Example 1

The utility model provides a novel pile foundation suitable for soft soil foundation handles, as shown in figure 1, includes steel-pipe pile 1, follows 1 inboard annular of steel-pipe pile is provided with concrete canvas 2, concrete canvas 2's inboard is provided with meets water inflation filler. The lower end of the steel pipe pile 1 is provided with a pile tip 4. In this embodiment, the pile tip 4 is a valve pile tip commonly used in a concrete cast-in-place pile in the prior art. In this embodiment, the water-swellable filler is a mixture 3 of sodium bentonite and quicklime.

As shown in fig. 2, before the pile body absorbs water and hardens, the concrete canvas 2 is folded, and the folded edge is parallel to the axial direction of the steel pipe pile 1. After the pile body absorbs water, the concrete canvas 2 in a peripheral folded state is unfolded under the action of horizontal stress generated by water absorption and expansion of a mixture 3 of sodium bentonite and quicklime, and after a certain time, the pile body is hardened to form a pile body with certain strength and provide bearing capacity for the pile body; meanwhile, the water content of the soil between the piles is reduced, and the soil body is solidified to provide the bearing capacity of the soil between the piles. The structure of the pile body after water absorption and hardening is shown in figure 3.

In this embodiment, the two sides of the concrete canvas 2 are woven by permeable materials, so that formation water can conveniently permeate the concrete canvas 2 to react with the mixture 3 of sodium bentonite and quicklime.

The sodium bentonite has the characteristics of water swelling and water loss shrinkage, so that the defect of water loss shrinkage can be improved after the sodium bentonite is mixed with the quicklime, and the composite pile body reduces the water loss shrinkage under the action of the quicklime and improves the strength of the composite pile body.

The utility model provides a novel pile foundation's construction method as follows:

step 1: assembling a concrete canvas 2 in a dry state and a mixture 3 of sodium bentonite and quicklime into a steel pipe pile 1, and forming a dry pile body in the steel pipe pile 1;

step 2: positioning the pile hole, and sinking the assembled steel pipe pile 1 through a pile press after the pile hole positioning is finished;

and step 3: stopping sinking after the valve pile tip reaches the designed elevation, opening the valve pile tip, then pulling up the steel pipe pile 1, pulling the valve pile tip out of the pile hole along with the steel pipe pile 1, and leaving the dry pile body in the pile hole under the action of self weight;

and 4, step 4: the dry pile body absorbs water to expand, extrudes the soil body, and is hardened after the dry pile body absorbs water, so that the enlarged pile body is formed.

Example 2

The present embodiment is basically the same as the embodiment 1, except that: pile toe 4 that adopts in this embodiment is prefabricated concrete pile toe, during pile sinking construction, directly pulls out steel-pipe pile 1 after reacing the design elevation, makes steel-pipe pile 1 and concrete pile toe separation, and steel-pipe pile 1 is pulled out the stake hole, and concrete pile toe and dry pile body stay in the stake is downthehole under the effect of dead weight to accomplish the pile foundation construction. After the steel pipe pile is pulled up, the dry pile body absorbs water to expand, the soil body is extruded, and the dry pile body is hardened after absorbing water to form the enlarged pile body. Horizontal additional stress generated in the process of horizontal expansion of water absorption expansion of the pile body acts on the soil body, the pore water pressure is increased, the pile body absorbs water and hardens, the water content of soil between piles is reduced, and then the drainage consolidation of the soil body is accelerated; the effect of make full use of stake and stake soil improves foundation bearing capacity.

The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.

Claims (5)

1. The utility model provides a novel pile foundation suitable for soft soil foundation handles which characterized in that: including steel-pipe pile (1), follow steel-pipe pile (1) inboard annular is provided with concrete canvas (2), the inboard of concrete canvas (2) is provided with meets water inflation filler, steel-pipe pile (1) bottom is provided with stake point (4), concrete canvas (2) are fold condition, and the axis direction of folding limit and steel-pipe pile (1) is parallel, the two sides of concrete canvas (2) are woven by the material that permeates water and are formed.

2. The new pile foundation of claim 1, wherein: the pile tip (4) is a valve pile tip or a concrete pile tip.

3. The new pile foundation of claim 2, wherein: the valve pile tip is detachably connected with the lower end of the steel pipe pile (1).

4. The new pile foundation of claim 2, wherein: the concrete pile tip is movably connected with the lower end of the steel pipe pile (1).

5. The novel pile foundation suitable for soft soil foundation treatment according to claim 1, wherein: the water-swellable filler is a mixture (3) of sodium bentonite and quicklime.

Images