阅读说明：本技术 一种利用秸秆桩对吹填土排水固结及土体改良的方法 (Method for drainage consolidation and soil improvement of dredger fill by using straw piles ) 是由 宋明志 周睿祺 朱建国 宗钟凌 王雨璇 尹志 陆阳阳 于 2019-10-22 设计创作，主要内容包括：本发明涉及秸秆桩改良吹填土的技术领域,具体涉及一种利用秸秆桩对吹填土排水固结及土体改良的方法,将秸秆桩压入吹填土中,桩头顶部直径比秸秆桩身直径大,压入时能延缓吹填土与秸秆桩身的接触,减少阻力；抽出抗压桩芯,抗压桩芯由钢管制作而成,压桩结束后可从秸秆桩身中抽离回收利用；秸秆桩利用秸秆自身较好的渗透性以及可降解纤维布透水隔泥性,可形成中空的秸秆排水空腔,秸秆桩身中设有内衬环,防止吹填土挤压后的秸秆桩身向中空腔塌陷,避免堵塞,便于水从中空腔内排出；定期将排水管插入秸秆桩身内部进行排水,使吹填土固结；桩头会缓慢分解及秸秆桩身腐烂降解,能增加吹填土的有机质和改善局部吹填土的松散性、透水性、透气性。(The invention relates to the technical field of improving dredger fill by straw piles, in particular to a method for draining and consolidating dredger fill and improving soil by utilizing straw piles, which is characterized in that the straw piles are pressed into the dredger fill, the diameter of the top of a pile head is larger than that of a straw pile body, the contact between the dredger fill and the straw pile body can be delayed during pressing, and the resistance is reduced; drawing out a compression-resistant pile core, wherein the compression-resistant pile core is made of a steel pipe, and can be drawn out from the straw pile body for recycling after the pile pressing is finished; the straw pile can form a hollow straw drainage cavity by utilizing the better permeability of the straw and the permeability and mud separation of the degradable fiber cloth, and the straw pile body is internally provided with the lining ring, so that the straw pile body extruded by the dredger fill is prevented from collapsing to the hollow cavity, the blockage is avoided, and the water is conveniently discharged from the hollow cavity; regularly inserting a drain pipe into the straw pile body for draining water to solidify the dredger fill; the pile head can be slowly decomposed and the pile body of the straw can be decomposed and degraded, so that the organic matters of the dredger fill can be increased, and the looseness, water permeability and air permeability of local dredger fill can be improved.)

1. A straw pile for consolidating and improving dredger fill drainage comprises a pile head (1), a straw pile body (2) and a compression-resistant pile core (3); the straw stalk pile is characterized in that the upper end of the pile head (1) is provided with a connecting rod (4), and the pile head (1) is connected with the straw pile body (2) through the connecting rod (4); inner lining rings (6) are uniformly arranged in the straw pile body (2) from top to bottom; the compression-resistant pile core (3) is inserted into the inner lining ring (6).

2. The straw pile for consolidation and improvement of dredger fill drainage of claim 1, wherein the pile head (1) is in an inverted conical shape, and the diameter of the top of the pile head (1) is larger than that of the straw pile body (2).

3. The straw pile for consolidation and improvement of dredger fill drainage according to claim 1, characterized in that the material of the pile head (1) is a material with slow release and foaming functions in water, and the pile head (1) is formed by high pressure compaction.

4. The straw pile for consolidation and improvement of drainage of dredger fill according to claim 1, characterized in that the straw pile body (2) is made of straw woven into curtain and the surface layer is made of degradable fiber cloth (5) fastened by an outer binding rope (7) by winding.

5. The straw pile for consolidating and improving dredger fill drainage of claim 1, wherein the material of the pile core (3) is a steel pipe.

6. The straw pile for consolidating and improving drainage of dredger fill according to claim 1, characterized in that the lining ring (6) is of wood material.

7. A method for drainage consolidation and soil body improvement of dredger fill by using the straw piles as claimed in claims 1-6 comprises the following steps:

s1, determining the pile pressing position and determining the longitudinal and transverse spacing of straw piles on the horizontal plane;

s2, connecting the pile head (1) with the straw pile body (2);

s3, digging a pre-pressing hole at the position of the pile pressing;

s4, pile pressing is carried out;

s5, after the straw pile is pressed into the dredger fill, standing the straw pile, and then drawing out the compression-resistant pile core (3);

s6, regularly draining the cavity formed by the straw pile body (2).

Technical Field

The invention relates to the technical field of improving dredger fill by straw piles, in particular to a method for draining and consolidating dredger fill and improving soil by utilizing straw piles.

Background

The dredger fill generally has the characteristics of small volume weight, large pore ratio, high water content, extremely low strength, high compressibility, small permeability and the like, a foundation or a roadbed formed by the dredger fill has very poor strength and cannot be directly used for engineering construction generally, meanwhile, the dredger fill has extremely poor water permeability and air permeability, the natural consolidation speed is very slow, and the growth of common green plants, green trees and the like is difficult; if engineering construction, greening and the like need to be carried out on a dredger fill site, manual treatment is needed.

At present, the consolidation and improvement methods of the dredger fill comprise a natural consolidation method, a replacement filling method, a grouting method and a prepressing method; the consolidation method is to improve the dredger fill through natural aging effect, and the method has long period; the method for changing the surface dredger fill into the soil layer with excellent physical properties is short in period and quick in effect, but high transportation cost is needed, fertile farmlands are damaged, and economic benefits are poor; the grouting method is characterized in that a straw drainage body is sunk into the dredger fill, and slurry is injected into the drainage body by inserting a metal pipe to form a sludge pile, so that the method is high in cost, pollutes the soil body and is not suitable for surface greening work of the dredger fill; the pre-pressing method is characterized in that external pressure or negative pressure generated by the soil body is applied to the soil body, so that water in the soil body is extruded into the drainage body to reduce the water content of the bottom soil body, and the consolidation effect is achieved.

The existing treatment mode can not effectively solidify and improve the dredger fill and can cause pollution and resource waste.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a method for drainage consolidation and soil body improvement of dredger fill by using straw piles, which can effectively solve the problems of long period, pollution and high cost in the dredger fill improving method in the prior art.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a straw pile for consolidating and improving dredger fill drainage comprises a pile head, a straw pile body and a compression-resistant pile core; the upper end of the pile head is provided with a connecting rod, and the pile head is connected with the straw pile body through the connecting rod; an inner lining ring is uniformly arranged in the straw pile body from top to bottom; the compression-resistant pile core is inserted into the inner lining ring.

Furthermore, the pile head is in an inverted cone shape, and the diameter of the top of the pile head is larger than that of the straw pile body.

Furthermore, the pile head is made of a material with slow release and foaming functions in water, and is formed by high-pressure compaction.

Furthermore, the straw pile body is formed by weaving straw into a curtain and winding degradable fiber cloth fastened by an outer binding rope on the surface layer.

Furthermore, the material of the compressive pile core is a steel pipe.

Still further, the inner liner ring is of a wood material.

The invention also discloses a method for drainage consolidation and soil body improvement of the dredger fill by utilizing the straw piles, which comprises the following specific steps:

1. determining the pile pressing position and determining the longitudinal and transverse spacing of straw piles on the horizontal plane;

2. connecting the pile head and the straw pile body;

3. digging a pre-pressing hole at the position of the pile pressing;

4. pile pressing is carried out;

5. after the straw pile is pressed into the dredger fill, standing the straw pile, and then drawing out the compression-resistant pile core;

6. and (3) draining the cavity formed by the straw pile body regularly.

Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:

(1) the straw pile has a simple structure and is convenient to construct; the diameter of the top of the pile head is slightly larger than that of the straw pile body, so that the contact between a dredger fill soil body and the pile body can be delayed during pressing in, the resistance is reduced, and the straw pile can be conveniently pressed in;

(2) the straw pile body is internally provided with the compression-resistant pile core steel pipe, so that the straw pile is high in compression resistance and bearing capacity and easy to complete the construction of the pile; the steel pipe can be recycled after construction;

(3) the straw pile body is formed by weaving straw into a curtain and winding degradable fiber cloth attached to the surface layer, the straw pile body has the characteristics of water and air permeability and mud resistance, and a pile core cavity cannot be filled with dredger fill, so that regular drainage is facilitated;

(4) the inner lining rings are uniformly arranged in the straw pile body, so that the straw pile body can be prevented from collapsing into the cavity due to extrusion of a dredger fill soil body, a space can be provided for later pumping and drainage operation for a long time, and the inner lining rings are made of wood materials and can be degraded and absorbed;

(5) the pile head is made of a material with slow release and foaming functions in water, and is slowly decomposed to generate bubbles when meeting water, so that the contact surface area of the pile head and a dredger fill soil body is increased, a drainage channel is formed, and drainage consolidation is quicker and better in effect;

(6) the straw pile can form a hollow straw drainage cavity by utilizing the better permeability of the straw and the permeability and mud separation of the degradable fiber cloth, and the hollow pipe of the straw pile body is internally provided with the lining ring, so that the straw pile body extruded by the dredger fill soil body is prevented from collapsing to the hollow cavity, the blockage is avoided, the water is conveniently discharged from the hollow cavity, and the dredger fill soil body is drained and consolidated; the pile head can be slowly decomposed along with the time, the straw pile body is decayed and degraded to be fused with the soil body, so that the organic matter of the soil body can be increased, and the looseness, water permeability and air permeability of the local soil body can be improved;

(7) the straw pile body can provide necessary space and nutrients for the root system of the tree, and the greening efficiency is high after hydraulic filling;

(8) the materials of the pile head and the straw pile body do not produce any pollution in soil, the materials are convenient to obtain, and the compression-resistant pile core can be recycled, so that the method has higher social benefit and economic benefit;

(9) the method has repeatability, and can be used for carrying out drainage consolidation and improvement on the same soil mass for multiple times.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic cross-sectional view of a straw pile according to the present invention;

FIG. 2 is a schematic view of the pile head structure of the present invention;

FIG. 3 is a schematic sectional view of a partial structure of the straw pile body of the present invention;

FIG. 4 is a schematic cross-sectional view A-A of FIG. 3 according to the present invention;

FIG. 5 is a schematic view of the process of fixing the straw piles and the drainage pipes;

the reference numerals in the drawings denote: 1-pile head; 2-straw pile body; 3-compressive pile core; 4-a connecting rod; 5-degradable fiber cloth; 6-inner lining ring; 7-external tying; 8-bubbles; 9-a drain pipe; a-a state diagram of pressing and filling the straw piles; b, a straw pile state diagram of the drawing-off pressure-resistant pile core; c-pile head decomposition state diagram; d-a fusion state diagram of straw pile decomposition and dredger fill.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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