CN106401466A - Soil squeezing rotary spraying pedestal pile forming device and construction method thereof - Google Patents

Abstract

The present invention provides a soil squeezing and grouting device for expanding the bottom of a pile and a construction method thereof. The soil squeezing and grouting device for expanding the bottom of a pile comprises a drill rod with a drill bit and a rotary grouting device for expanding the bottom of the pile. The drill bit comprises a plurality of through holes formed on its outer periphery. The rotary grouting device for expanding the bottom of the pile comprises a grouting pump, a grouting pipe connected to the grouting pump and a high-pressure nozzle. The grouting pipe is inserted into the drill rod. The nozzles of the grouting pipe are respectively opposite to the plurality of through holes and the high-pressure nozzle is connected to the through holes and the nozzles of the grouting pipe. The present invention utilizes a rotary grouting device for expanding the bottom of a pile provided on the drill rod to complete the expansion of different soil types. The structure is simple in design, low in cost, good in effect, and suitable for mass production and popularization.

Description

Forming device and construction method of soil-squeezing rotary-spraying bottom-expanding pile

【Technical field】

The invention relates to the field of construction engineering, in particular to a soil-squeezing rotary-spraying bottom-expanding pile forming device and a construction method thereof.

【Background technique】

At present, in foundation projects such as construction, water conservancy, and highways, double-helix extruded piles are currently the most commonly used form of pile foundation. The soil that is drilled out of the hole will be squeezed into the side wall of the pile hole, and then the two-way helical closed extrusion drill bit will move upwards and rotate again to squeeze and expand the pile hole. Squeeze into the side wall of the pile hole, and start the concrete pump to press the pile material into the pile hole while the topspin is lifted. The main problem is that the soil is rotary excavated first, then transported upwards and then squeezed to the pile walls on both sides. Therefore, the rotated soil will block the transportation path formed by the rotating blades, and it is easy to cause the drilling phenomenon. Moreover, the discharged earth or mud increases the difficulty and progress of pile construction.

With the increase of building height, the foundation pile length gradually increases, and the difficulty of pile foundation construction is also increasing. The bearing capacity of cast-in-situ piles used in existing pile foundation construction is mainly composed of pile end soil resistance and pile side soil friction; Piles may not meet the requirements.

Therefore, it is necessary to provide a soil-squeezing rotary grouting bottom expansion pile forming device used under complex geological conditions.

【Content of invention】

The object of the present invention is to provide a soil-squeezing rotary-spraying bottom-expanding pile forming device and a construction method thereof.

Technical scheme of the present invention is as follows:

A soil-squeezing rotary grouting bottom expansion pile forming device, comprising a drill pipe with a drill bit and a rotary grouting bottom expansion device, the drill bit includes a number of through holes formed on its outer periphery, and the rotary spraying bottom expansion device includes a grouting pump . A grouting pipe and a high-pressure nozzle communicated with the grouting pump, the grouting pipe is inserted in the drill pipe, the nozzles of the grouting pipe are respectively opposite to a plurality of the through holes and the high-pressure nozzle The through hole communicates with the nozzle of the grouting pipe.

Preferably, the drill rod includes a body, a blocking ring and a helical column connected in sequence, and the helical post is formed by extending from the drill bit, the body, the blocking ring, the helical post and the drill bit are arranged concentrically with the central axis, and the blocking ring The inner diameter is larger than the helical column and the body.

Preferably, the number of the through holes is one or two, which are provided on the side wall of the drill bit.

Preferably, the number of the through holes is three, two of which are arranged on the side wall of the drill bit, and the other one is arranged on the top end of the drill bit.

Preferably, the outer diameter of the grouting pipe is 3-6 cm.

A construction method using a soil-squeezing rotary grouting bottom expansion pile forming device, comprising the following steps:

(1), providing a drilling tool with a blocking ring, using the forward rotation of the drilling tool to drill the soil, and the drilling tool forms a soil layer on the inner wall forming the pile foundation;

(2), when the drilling depth of the drilling tool reaches the preset depth of the pile foundation, stop the drilling tool;

(3), turn on the rotary grouting bottom expander. Put the grouting pipe into the drill pipe, and the nozzle of the grouting pipe is opposite to the through hole, and connect it through a high-pressure nozzle, and at the same time opening the drilling tool;

(4), spray grout to the inner wall of pile foundation head, spray grout to eject from described through hole, realize the grout spray around and bottom at described drill bit, the grout layer of high-pressure ejection is to realize pile foundation head expand;

(5) After the grouting is completed, the drilling tool is screwed out from the pile foundation, and at the same time, concrete is poured into the pile foundation head and the pile foundation in turn to complete the bottom expansion pile.

The beneficial effects of the present invention are:

1. Use the rotary spray bottom expander installed in the drill pipe to complete the expansion of different soil properties. This structure is simple in design, low in cost and good in effect, and is suitable for mass production and popularization.

2. The structure of the blocking ring squeezes the hole wall of the extruded and expanded pile for the second time, preventing the soil from being screwed out during the pile forming process and directly extruded and expanded to form a pile. It has a novel structure, good pile quality, and is not easy to hold back drilling.

3. Environmental protection, no mud discharge, no slag transported outside, no construction dust, no soil storage site, and the surrounding environment will not be polluted.

【Description of drawings】

Fig. 1 is a structural diagram of a soil-squeezing rotary-spraying bottom-expanding pile forming device of the present invention.

【detailed description】

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Please refer to FIG. 1 , which is a structural diagram of a soil-squeezing rotary grouting bottom expansion pile forming device of the present invention.

A soil-squeezing rotary grouting bottom expansion pile forming device 100 includes a drill pipe 1 with a drill bit 11 and a rotary grouting bottom expander 2, and the drill bit 11 includes several through holes 111 formed on its outer periphery.

The rotary spray bottom expander 2 includes a grouting pump 21, a grouting pipe 22 communicated with the grouting pump 21 and a high-pressure nozzle (not shown in the figure), and the grouting pipe 22 is inserted into the drill pipe 1 Inside, the nozzles of the grouting pipe 22 are respectively opposite to several of the through holes 111 and the high pressure nozzle communicates with the through holes 111 and the nozzles of the grouting pipe 22 .

The drill pipe 1 also includes a body 12, a blocking ring 13 and a helical post 14 connected in sequence, the helical post 14 extending from the drill bit 11, the body 12, the blocking ring 13, the helical post 14 and the drill bit 11 The central axis is set, and the inner diameter of the blocking ring 13 is larger than that of the screw column 14 and the body 12 .

The number of the through holes 111 is one or two, which are arranged on the sidewall of the drill bit 11 .

There are three through holes 111 , two of which are arranged on the sidewall of the drill bit 11 , and the other one is arranged on the top end of the drill bit 11 .

Further, when the geological structure is a sand layer, the number of through holes 111 is one drill bit 11; when the geological structure is a soil layer, the number of through holes 111 is two drill bits 11; when the geological structure is a mudstone layer, A drill bit 11 with three through holes 111 is selected for use.

The outer diameter of the grouting pipe 22 is 3-6 cm, specifically 4 cm in this embodiment.

A construction method using a soil-squeezing rotary grouting bottom expansion pile forming device, comprising the following steps:

(1), providing a drilling tool with a blocking ring, using the forward rotation of the drilling tool to drill the soil, and the drilling tool forms a soil layer on the inner wall forming the pile foundation;

(2), when the drilling depth of the drilling tool reaches the preset depth of the pile foundation, stop the drilling tool;

(3), turn on the rotary grouting bottom expander. Put the grouting pipe into the drill pipe, and the nozzle of the grouting pipe is opposite to the through hole, and connect it through a high-pressure nozzle, and at the same time opening the drilling tool;

(4), spray grout to the inner wall of pile foundation head, spray grout to eject from described through hole, realize the grout spray around and bottom at described drill bit, the grout layer of high-pressure ejection is to realize pile foundation head expand;

(5) After the grouting is completed, the drilling tool is screwed out from the pile foundation, and at the same time, concrete is poured into the pile foundation head and the pile foundation in turn to complete the bottom expansion pile.

The beneficial effects of the present invention are:

1. Use the rotary spray bottom expander installed in the drill pipe to complete the expansion of different soil properties. This structure is simple in design, low in cost and good in effect, and is suitable for mass production and popularization.

2. The structure of the blocking ring squeezes the hole wall of the extruded and expanded pile for the second time, preventing the soil from being screwed out during the pile forming process and directly extruded and expanded to form a pile. It has a novel structure, good pile quality, and is not easy to hold back drilling.

3. Environmental protection, no mud discharge, no slag transported outside, no construction dust, no soil storage site, and the surrounding environment will not be polluted.

What has been described above is only the embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of the present invention, but these all belong to the present invention. scope of protection.

Claims (6)

1. a kind of soil compaction rotary-jetting bottom-expanding pile shaped device it is characterised in that：Including the drilling rod with drill bit and churning base expanding and base expanding device, institute State some through holes that drill bit includes being formed at its outer peripheral edge, described churning base expanding and base expanding device is included grouting pump and connected with described grouting pump Grouting Pipe and high pressure nozzle, described Grouting Pipe is inserted in described drilling rod, and the spout of described Grouting Pipe is described with some respectively Through hole is relatively and described high pressure nozzle connects the spout of described through hole and described Grouting Pipe.

2. soil compaction rotary-jetting bottom-expanding pile shaped device according to claim 1 it is characterised in that：Described drilling rod includes connecting successively The body that connects, stop circle and borded pile, described borded pile extends from described drill bit and formed, described body, stop circle, borded pile and Drill bit is arranged with central shaft, and the described internal diameter stopping circle is more than described borded pile and described body.

3. soil compaction rotary-jetting bottom-expanding pile shaped device according to claim 1 it is characterised in that：The quantity of described through hole is one Individual or two, it is located at the side wall of described drill bit.

4. soil compaction rotary-jetting bottom-expanding pile shaped device according to claim 1 it is characterised in that：The quantity of described through hole is three Individual, located at the side wall of described drill bit, another is located at the center point of described drill bit for two of which.

5. soil compaction rotary-jetting bottom-expanding pile shaped device according to claim 1 it is characterised in that：The external diameter of described Grouting Pipe is 3-6 centimetre.

6. a kind of application soil compaction rotary-jetting bottom-expanding pile shaped device construction method it is characterised in that：Comprise the steps：

(1), provide and there is the drilling tool stopping circle, apply described drilling tool to rotate forward and soil is holed, described drilling tool is in shape The inwall becoming pile foundation forms soil compaction layer；

(2), when the drilling depth of described drilling tool reaches the predetermined depth of pile foundation, stop described drilling tool；

(3), open described churning base expanding and base expanding device. by described Grouting Pipe load described drilling rod in, and by the spout of described Grouting Pipe with Described through hole relatively, and is connected by high-pressure nozzle, opens described drilling tool simultaneously；

(4), the inwall of pile foundation head is whitewashed, whitewashing sprays from described through hole, realize around described drill bit and bottom Whitewashing, the expansion to realize pile foundation head for the grout layer that high pressure sprays；

(5), after the completion of, whitewashing, by drilling tool, in pile foundation, spiral shell goes out, and simultaneously successively to concrete perfusion in pile foundation head and pile foundation, completes Described club-footed pile.