CN210621680U

CN210621680U - Extrusion-spraying reaming pressure-grouting concrete pile

Info

Publication number: CN210621680U
Application number: CN201921038295.6U
Authority: CN
Inventors: 李金良; 黄元晨
Original assignee: Shandong Bei Te Li Foundation Engineering Technology Co ltd
Current assignee: Shandong Bei Te Li Foundation Engineering Technology Co ltd
Priority date: 2019-07-04
Filing date: 2019-07-04
Publication date: 2020-05-26
Anticipated expiration: 2029-07-04

Abstract

The utility model discloses an crowded reaming of spouting presses and irritates concrete pile, its pile body comprises pile body, the reaming body and pile tip, and the pile body is concrete, cement layer and crowded dense soil layer from interior to exterior in proper order. The utility model improves the bearing capacity of a single pile by 1-3 times, saves building materials, produces less waste materials, can protect the natural environment, and is an environment-friendly pile with high bearing capacity and low compression deformation. The utility model discloses need not to adopt big moment of torsion power take off in the work progress, only adopt conventional power take off can be under construction, and the work progress need not to change the drilling tool moreover, and power needs the moment of torsion little, the energy consumption is low, construction convenience.

Description

Extrusion-spraying reaming pressure-grouting concrete pile

Technical Field

The utility model discloses generally speaking relates to concrete pile, and specifically speaking relates to a scene bored concrete pile.

Background

The building industry is an industry which consumes a large amount of natural resources and energy and has obvious and outstanding negative effects on the environment, wastes are reduced in building construction, energy consumption is reduced, engineering quality is improved by using an innovative technology, consumption of building materials is reduced, and the building industry is an urgent task.

At present, most of building structure foundation engineering at home and abroad adopts a concrete pile foundation, and soil and slurry in a pile hole can be discharged out of the ground in the construction process of a cast-in-situ bored pile. In order to reduce construction discharge, various spiral soil-extruding cast-in-place piles appear in China in recent years, but the piles of the type have the outstanding problems that construction needs large-torque power transmission and energy consumption is large. In order to meet the requirements of deformation resistance, earthquake resistance and bearing building design, the bearing capacity is improved by lengthening piles, increasing the diameter of a pile body and the like. However, lengthening or enlarging the pile body can increase the concrete consumption, especially when the ratio of the length to the diameter of the pile body is too large, the bearing capacity of the pile body is remarkably reduced, and it is often useless to increase the bearing capacity of the pile body by lengthening or enlarging the diameter of the pile body. Meanwhile, a great deal of concrete waste is caused.

When the conventional spiral soil-squeezing cast-in-place pile is drilled, soil layers around the concrete pile are squeezed densely, the frictional resistance and the end resistance around the concrete pile are improved by about 50%, the bearing capacity of more single piles is improved, and the difficulty is very high. Therefore, the process is very complicated, and the constructor usually selects different drilling tools according to different stratum hardness conditions, for example, a sand layer drill rod is used in a sand layer, a hard soil layer drill rod is used in a hard soil layer, and the like, and when the constructor encounters a hard stratum, two motors with the power output of more than 75kW are usually adopted to complete the drilling.

Although the drilling is completed in the construction mode, the original stratum skeleton structure is damaged due to forced drilling by using a drilling tool with large torque power transmission and high hardness, damaged rock and soil particles are extruded together, but a new skeleton structure cannot be effectively formed, and as time goes on, moisture in the external environment continuously permeates, the rock and soil particles near the concrete pile form a skeleton again to sink, so that the bearing capacity of the concrete pile is reduced.

Therefore, in order to solve the above problems, there is a strong need for improvement of the existing extruded and expanded pile, construction method and drilling machine used therefor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an crowded reaming of spouting presses and irritates concrete pile.

The technical scheme is as follows:

a squeezing, spraying, reaming and pressure-grouting concrete pile comprises a pile body, a reaming body and a pile end, wherein the pile body sequentially comprises concrete, a cement soil layer and a squeezing soil layer from inside to outside.

Wherein, a reinforcement cage is arranged in the pile body. The expanding body is arranged on a soil layer with higher deformation modulus and high shear resistance.

Wherein the maximum diameter of the pile body is smaller than the maximum diameter of the diameter expanding body. When the frustum inclined plane of the double-frustum diameter-expanding body is stressed, the bearing capacity is increased.

Furthermore, the diameter-expanding body is a double-frustum-shaped diameter-expanding body which is integrally formed with the pile body, and the number of the diameter-expanding bodies is at least one.

The included angle α between the lower inclined plane of the double-cone diameter-enlarging body and the central axis of the pile body is 5-80 degrees.

The utility model discloses during the construction, adopt crowded native drilling tool pore-forming, spout cutting soil body soon with multilayer high-pressure nozzle and form the body of expanding of two frustum cement soil, the grout rises in the same direction as space around the drilling rod simultaneously, becomes soil cement by the left-handed drilling tool stirring with the downthehole loose soil of stake, extrudees on the pore wall around the stake hole, has increased the diameter of the body of expanding. After the jet grouting expanding body is finished, lifting a drill rod to press, fill, vibrate and extrude concrete to replace cement in the expanding body to form a combined expanding body with an inner core made of concrete and the periphery made of cement; then lifting the drill to press and pour the concrete pile body, the drill tool continues to rotate to gradually extrude all or most of the soil cement formed by mixing the soil collapsed, drilled loose or reduced diameter between the hole walls of the drill tool and the cement slurry sprayed upwards (on one hand, the expanded diameter body of the expanded diameter split drill tool at the lower part continuously extrudes the soil mass, on the other hand, the drill rod formed by connecting the left-handed split drill tool at the upper part has long length, the blade width of the drill tool is only 5-20cm, most of the soil mass cannot be taken out of the hole along with the blade and is continuously extruded into the surrounding stratum) to form a cement soil layer, the diameter of the pile body is increased, as the lubrication of water in the gaps of the soil layer is increased, the soil layer particles with different shapes and sizes are further rearranged after extrusion, a layer of compaction soil layer with higher density is formed at the outermost side of the cement soil layer (as the water quantity required by cement hydration is far, therefore, the excess water in the cement paste is about 50%, the excess water penetrates into the surrounding squeezed stratum by rotary extrusion with a drilling tool, thicker cement particles cannot enter the far stratum, a thin cement soil layer is formed on the outermost side of the cement soil layer, the water can penetrate into the far stratum and further react with soil layer particles damaged by the original structure to form a more compact and new structural framework, namely, the squeezed soil layer is solidified and bonded, the strength is gradually increased, the soil layer around the whole pile body is little in compression deformation and most suitable for being jointly supported by composite foundation pile soil), and the extrusion-spraying, reaming and pressure-grouting concrete pile is formed. And the bearing capacity of the pile body is increased along with the time.

The concrete, cement soil layer and compacted soil layer are tightly connected together, the pile body and the inverted cone expanding body are integrated, when the pile top is pressed, the pile body and the soil layer around the cone are squeezed together to bear force, and the original frictional resistance between pile soils is converted into the shearing force of the soil layer except the compacted soil layer.

The utility model discloses a crowded reaming drilling tool construction bored concrete pile that spouts increases the re-spraying number of times with the multilayer shower nozzle at the different degree of depth in stratum with the high pressure jet grouting technique, spouts into the reasonable stake type of different diameter hole enlargement body constitution wedge type back taper platform. A part of cement paste in the rotary spraying cement paste rises along the drill rod, and redundant moisture permeates into the soil layer to increase the lubrication among soil particles, so that the energy consumption is low, and the soil layer can be compacted. The high-pressure jetting extrusion of the soil layer around the pile is close to the passive soil pressure, the pile body of the extruded and expanded hole is welded in the expanding body of the frustum, so that the compacted soil layer around the pile body is connected with the compacted soil layer of the frustum, therefore, in the engineering calculation of the bearing capacity of the extruded and expanded hole concrete-poured pile, the common action problem of the compacted soil around the pile is considered, the area of the pile side is increased, the pile body and the compacted soil layer around the frustum are pulled to bear force together, and the original frictional resistance between the pile soils is converted into the shearing force of the soil layer outside the compacted cement soil layer. Therefore, the advantages of extrusion, spraying, reaming and pressure grouting of the concrete pile are obvious in technology, cost and environmental protection.

Compared with the prior art, the utility model discloses an outstanding effect lies in:

(1) under the same geological conditions, the material consumption is not increased, and on the basis of the pile press-filling process, the conventional cylindrical pile body with the equal section is only required to be pressed to compact a hole wall soil layer by using a soil extruding and reaming device, and meanwhile, the inverted frustum reasonable pile form is manufactured by using cement paste for expanding holes and press-filling concrete in a frustum bearing layer.

(2) The bearing capacity of the single pile is improved by 1-3 times, building materials are saved, waste materials are reduced, the natural environment can be protected, and the pile is an environment-friendly pile with high bearing capacity and low compression deformation.

The concrete pile of the present invention will be further described with reference to the drawings and the specific embodiments.

Drawings

FIG. 1 is a schematic structural view of a concrete pile drilling machine for extrusion, spraying, reaming and pressure grouting;

FIG. 2 is a schematic structural view of a split drill of a drill bit;

FIG. 3 is a schematic structural view of an expanding split drilling tool;

FIG. 4 is a schematic structural view of a left-handed split drilling tool;

FIG. 5 is a top view of the split drill bit;

FIG. 6 is a schematic cross-sectional view of a squeeze-spray, hole-expanding, pressure-grouting concrete pile;

FIG. 7 is a flow chart of the construction of extrusion-grouting, hole-enlarging and pressure-grouting concrete pile.

Detailed Description

Example 1

Referring to fig. 1-5, a concrete pile drilling machine for extrusion, spraying, reaming and pressure grouting comprises a spiral hollow drill rod formed by combining a plurality of split drilling tools and a power head 5 connected with the spiral hollow drill rod, wherein one side of the outer wall or the inner wall of a core pipe of the spiral hollow drill rod is provided with a high-pressure grouting pipe 4 from top to bottom, the upper end of the high-pressure grouting pipe 4 is connected with a grouting device 6 through the inner cavity of the power head 5, the split drilling tools comprise a drill bit split drilling tool 1, an expanding split drilling tool 2 and at least one left-handed split drilling tool 3, as shown in fig. 3, the middle part of the expanding split drilling tool 2 is a hollow cylindrical extrusion body 21 with equal diameter, an upper conical table 22 with gradually reduced outer diameter from bottom to top is arranged above the extrusion body 21, a lower conical table 23 with gradually increased outer diameter from bottom to top is arranged below the extrusion body 21, the lower end of the high-pressure grouting pipe 4 is provided with a plurality of grouting nozzles 11, the grouting nozzles 11 are, the width of the outer spiral blade of the split drilling tool is 5-20 cm.

The distance between two adjacent layers of grouting nozzles 11 is 15cm, each layer of grouting nozzles 11 is provided with 2 nozzles, and the injection pressure is 1-40 MPa.

The grouting spray heads 11 are three layers, each layer of grouting spray heads 11 is provided with 2 nozzles, and the diameter of each nozzle is 2 mm. The projections of the three layers of grouting nozzles on the horizontal plane are uniformly distributed at 120 degrees.

Wherein, the length of the drill bit split drilling tool is 1-1.5m, the length of the expanding split drilling tool is 1-1.5m, and the number of the left-handed split drilling tools is determined according to the design depth.

The outer helical blades of all the split drilling tools are equal pitch or variable pitch; the diameter of the external spiral blade is equal to the diameter of the pile body of the designed cast-in-place pile. All the split drilling tools are connected through hollow hexagonal quick connectors or flanges.

In other engineering embodiments, the number of layers of the grouting nozzles can be 2-10 according to actual construction requirements. Each layer of grouting spray head can be provided with 1-6 nozzles, and the pressure bearing of each nozzle is set to be 1-40 MPa. The distance between two adjacent grouting spray heads can be 5-35 cm, the horizontal distance between two adjacent nozzles in each grouting spray head layer can be 1-6 cm, and the diameter of each nozzle can be 2-10 mm.

Example 2

As shown in fig. 6, the extrusion-spray reaming pressure-grouting concrete pile comprises a pile body 101, an expanding body 102 and a pile end 103, wherein the pile body comprises concrete 100, a cement layer 200 and an extrusion-dense soil layer 300 from inside to outside. A reinforcement cage 400 is arranged in the pile body.

The expander 102 is disposed in a layer of soil having a relatively high modulus of deformation and high shear resistance.

The maximum diameter of the pile body 101 is smaller than that of the reducing body 102, and the maximum diameter of the pile body 101 is larger than or equal to that of the pile end 103.

The diameter-expanding body 102 is a double-frustum-shaped diameter-expanding body which is integrally formed with the pile body 101, and the number of the diameter-expanding bodies is one, and the included angle α between the lower inclined plane of the double-frustum-shaped diameter-expanding body and the central axis of the pile body is 5-80 degrees.

As shown in fig. 7, the construction method of the extrusion-spray reaming pressure-grouting concrete pile comprises the following steps:

(1) when drilling is performed by combining the drilling rig of example 1 with a three-point pile driver stand, and drilling in hard soil is difficult, cement paste or water is sprayed in a rotating manner to soften the soil, and drilling is continued until the designed depth is reached, as shown in fig. 7 a.

(2) Adjusting the pressure (1-40MPa) and the lifting speed (6-60cm/min) of a nozzle, carrying out rotary spraying on cement paste by a left-handed lifting drill rod to manufacture a cement-soil double-frustum diameter-expanding body, sequentially pressing and pouring the extruded concrete as shown in figure 7b, forming a concrete and cement-soil composite double-frustum diameter-expanding body at the design height of the rotary spraying diameter-expanding body, and stopping rotary spraying as shown in figure 7 c;

(3) adjusting the lifting speed, continuously lifting the drill rod in a left-hand rotation manner, simultaneously pressing and pouring concrete to a designed elevation of the pile top, when the drill rod is lifted, cement slurry rising along the drill rod wets soil, the drilling tool gradually extrudes all or most of cement soil formed by mixing collapsed, drilled loose or reduced soil between the hole walls of the drilling tool and the cement slurry rising in a rotary spraying manner to soil around the hole walls of the pile to form cement soil layers, the diameter of the pile body is increased, soil particles with different shapes and sizes are further rearranged due to the lubricating effect of water in gaps of the soil layers, a dense soil layer with higher density is formed on the outermost side of the cement soil layers, and finally a plain concrete pile sequentially comprising concrete, the cement soil layers and the dense soil layers from inside to outside is formed, as shown in fig. 7 d.

(4) After the plain concrete pile is formed, the reinforcement cage is inserted into the concrete in the pile hole to a designed depth to form a reinforced concrete pile, as shown in fig. 7 e.

The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.

Claims

1. The utility model provides an crowded reaming pressure of spouting concrete pile, its pile body comprises pile shaft, reaming body and pile tip, its characterized in that: the pile body sequentially comprises concrete, a cement soil layer and an extruded soil layer from inside to outside; the diameter-expanding body is a double-frustum-shaped diameter-expanding body integrally formed with the pile body, and the number of the diameter-expanding bodies is at least one.

2. The extrusion-spray reaming pressure-grouting concrete pile according to claim 1, characterized in that: and a reinforcement cage is arranged in the pile body.

3. The extrusion-spray reaming pressure-grouting concrete pile according to claim 1 or 2, characterized in that: the expanding body is arranged on a soil layer with higher deformation modulus and high shear resistance.

4. The extrusion-spray reaming pressure-grouting concrete pile according to claim 3, characterized in that: the maximum diameter of the pile body is smaller than that of the diameter expanding body.