CN106049463A - Soil-squeezing hole-expanding pile and construction method and drilling tool thereof - Google Patents

Abstract

The invention provides a soil-squeezing reaming pile, a construction method of the soil-squeezing reaming pile and a drilling tool of the soil-squeezing reaming pile. Crowded native reaming stake is including crowded soil portion and the reaming portion that is located crowded soil portion bottom, crowded soil portion includes the pile foundation and fills in the concrete pile body of pile foundation, the pile foundation including be located its inner peripheral crowded soil layer, be formed at the internal thread of crowded soil layer inner wall, concrete pile body is including being formed at its outer wall's external screw thread, the internal thread with the external screw thread spiro union. The blocking ring structure of the invention carries out secondary extrusion on the hole wall of the extruded and expanded pile to prevent soil from being screwed out in the pile forming process to directly extrude and expand the pile, and the expanding head is set to be a double-layer structure of an inner cylinder and an outer cylinder, the flaring teeth are arranged on the inner cylinder, and the rotation of the expanding head is utilized to control the extension and the contraction of the flaring teeth, thus finishing flaring of different soil qualities.

Description

A soil-squeezing reaming pile, a construction method of the soil-squeezing reaming pile and a drilling tool thereof

【Technical field】

The invention relates to the field of construction engineering, in particular to a soil-squeezing reaming pile, a construction method of the soil-squeezing reaming pile and a drilling tool 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 reaming pile used under complex geological conditions, a construction method of the soil-squeezing reaming pile and a drilling tool thereof.

【Content of invention】

The object of the present invention is to provide a soil-squeezing reaming pile, a construction method of the soil-squeezing reaming pile and a drilling tool thereof.

Technical scheme of the present invention is as follows:

A soil-squeezing reaming pile, comprising a soil-squeezing part and a reaming part located at the bottom of the soil-squeezing part, the soil-squeezing part includes a pile foundation and a concrete pile body filled in the pile foundation, and the pile foundation includes The squeezed soil layer, the internal thread formed on the inner wall of the squeezed soil layer, the concrete pile body includes an external thread formed on its outer wall, and the internal thread is screwed with the external thread; the reaming part includes a self- A pile foundation head formed by extending the bottom of the pile foundation, a cement slurry layer covering the inner wall of the pile foundation head, and a concrete pile head filled in the cement slurry layer.

Preferably, the concrete pile body and the concrete pile head are poured integrally.

A construction method of a soil-squeezing reaming pile, comprising the steps of:

(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 squeezed 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), the drilling tool also includes an enlarging head located at its bottom, the enlarging head has flaring teeth and a protruding opening, the enlarging head is driven to rotate in reverse by the drill rod, and the enlarging teeth pass through the protruding mouth The outlet protrudes outward, and the bottom of the pile foundation is enlarged through the flaring teeth, and after the pile foundation head is formed, the drilling tool is stopped;

(4) Drive the enlarging head to rotate in the forward direction again, so that the flaring teeth extend inward through the protruding opening and are accommodated in the protruding opening, then stop the drilling tool;

(5), the inner wall of the pile foundation head is sprayed to form a cement slurry layer;

(6) 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;

(7), the outer wall of the blocking ring includes an external thread, and the external thread forms an internal thread engaged with the external thread on the inner wall of the squeezed soil layer;

(8) When concrete is poured into the pile foundation, concrete is poured into the internal thread to complete the soil-squeezing and reaming pile.

A drilling tool, comprising a drill pipe with a drill bit and an expanding head sleeved on the drill bit, the expanding head includes flaring teeth, an inner cylinder and an outer cylinder sleeved on the inner cylinder, and the inner cylinder and the The outer cylinder is arranged at intervals, the inner cylinder includes a buckle portion, the outer cylinder includes a limiting portion and an extension opening, the number of the limiting portions is two and formed at intervals on the inner peripheral edge of the outer cylinder, the locking portion The buckle is formed on the outer peripheral edge of the inner cylinder and is clamped between the two limiting parts, the protruding opening is a through hole passing through the outer cylinder, and the flaring teeth are included with the inner cylinder A movable connecting part and a flaring part extending from the connecting part and inserted into the protruding opening; the drill rod also includes a sequentially connected body, a blocking ring and a helical column, and the helical column is formed by extending from the drill bit, The body, the blocking ring, the screw column and the drill bit are arranged concentrically. The inner diameter of the blocking ring is larger than that of the screw column and the body, and the depth of the threads surrounding the outer wall of the screw column is greater than that of the outer wall of the blocking ring. thread.

Preferably, the thread circumference of the outer wall of the blocking ring is the same as the thread circumference of the outer wall of the helical column.

Preferably, the inner cylinder and the outer cylinder are hollow cylinders with concentric axes.

Preferably, the inner cylinder and the outer cylinder pass through the limiting portion and the buckle portion and rotate coaxially in opposite directions within an arc length between the two limiting portions.

Preferably, the length of the arc chord between the two limiting parts is smaller than the length of the flaring part.

Preferably, through the relative rotation of the inner cylinder and the outer cylinder, the flaring portion protrudes and contracts along the direction of the protruding opening.

Preferably, the limiting portion and the locking portion are formed on the same horizontal plane.

The beneficial effects of the present invention are:

1. 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.

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

3. Set the expansion head as a double-layer structure of the inner cylinder and the outer cylinder, set the flaring teeth on the inner cylinder, and use the rotation of the expansion head to control the extension and contraction of the expansion teeth to complete the expansion of different soil properties , the structural design is simple, the cost is low, the effect is good, and it is suitable for mass production and popularization.

【Description of drawings】

Fig. 1 is the cross-sectional view of the soil-squeezing reaming pile of the present invention;

Fig. 2 is the structural diagram of drilling tool of the present invention;

Fig. 3 is a sectional view of the use state one of the expanding head of the drilling tool shown in Fig. 2;

Fig. 4 is a cross-sectional view of the second use state of the expanding head of the drilling tool shown in Fig. 2 .

【detailed description】

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

Please refer to FIG. 2 to FIG. 4 at the same time. The present invention provides a drilling tool 100 , which includes a drill rod 2 with a drill bit 21 and an expanding head 1 sleeved on the drill bit 21 .

The enlarging head 1 includes flaring teeth 11 , an inner cylinder 12 and an outer cylinder 13 sleeved on the inner cylinder 12 , and the inner cylinder 12 and the outer cylinder 13 are arranged at intervals.

The inner barrel 12 includes a locking portion 121 .

The outer cylinder 13 includes a limiting portion 131 and an extension opening 133, the number of the limiting portions 131 is two and formed at intervals on the inner peripheral edge of the outer cylinder 13, and the buckle portion 121 is formed on the inner cylinder On the outer peripheral edge of the outer cylinder and clamped between the two limiting parts 131 , the extension opening 133 is a through hole penetrating through the outer cylinder 13 .

The flaring tooth 11 includes a connecting portion 111 movable with the inner barrel 12 and a flaring portion 112 extending from the connecting portion 111 and inserted into the protruding opening 133 .

The inner cylinder 12 and the outer cylinder 13 are hollow cylinders with concentric axes; The length of the circular arc between the two limiting parts 131 rotates coaxially in opposite directions; specifically, the length of the chord of the arc between the two limiting parts 131 is smaller than the length of the flaring part 112 .

Through the relative rotation of the inner cylinder 12 and the outer cylinder 13 , the flaring portion 112 protrudes and contracts along the direction of the protruding opening 133 .

The limiting portion 131 is formed on the same level as the locking portion 121 .

The outer cylinder 13 is integrally formed; the inner cylinder 12 is integrally formed.

A hinge 14 is also included, and the hinge 14 connects the flaring teeth 11 and the inner cylinder 12 .

In this embodiment, in FIG. 3 , the drill rod drives the inner cylinder 12 to rotate counterclockwise, and the arc length of the outer cylinder 13 between the two limiting portions 131 through the buckle portion 121 Rotate clockwise within the range; make the flaring part 112 shrink along the direction of the protruding opening 133 .

In FIG. 4 , the drill rod drives the inner cylinder 12 to rotate clockwise, and the outer cylinder 13 rotates counterclockwise within the arc length range between the two limiting portions 131 through the buckle portion 121 ; The flaring portion 112 shrinks along the direction of the protruding opening 133 .

The drill rod 2 also includes a body 22, a blocking ring 23 and a helical column 24 which are connected in sequence. The central axis is set, the inner diameter of the blocking ring 23 is larger than that of the screw post 24 and the body 2 , and the thread 241 surrounding the outer wall of the screw post 24 is deeper than the thread 231 on the outer wall of the blocking ring 23 .

Further, the circumference diameter of the thread 231 on the outer wall of the blocking ring 23 is the same as the circumference diameter of the thread 241 on the outer wall of the helical column 241 . This structure ensures that during the piling process of the drilling tool 100, the barrier ring 23 structure performs a second squeeze on the hole wall of the extruded and expanded pile, preventing the soil from being unscrewed and directly extruded and expanded into a pile during the pile forming process.

Preferably, the height ratio of the barrier ring 23 and the screw column 24 is preferably 7:25, and the actual size requirements, the height of the barrier ring 23 is 70cm, and the height of the screw column 24 is 250cm, which can ensure that the squeezed The expanded pile hole depth meets the design requirements, and it also ensures that the screw column 24 squeezes the hole wall of the expanded pile for the second time, preventing the pile from being screwed out and directly extruded and expanded into piles.

Referring to Fig. 1, the present invention also provides a soil-squeezing reaming pile 300 completed by using the drilling tool 100. Part 4, the soil squeezing part 3 includes a pile foundation 31 and a concrete pile body 32 filled in the pile foundation 31 .

The pile foundation 31 includes a soil-squeezing layer 311 located at its inner periphery, and an internal thread 313 formed on the inner wall of the soil-squeezing layer 311 .

The concrete pile body 32 includes an external thread 321 formed on its outer wall, and the internal thread 313 is screwed to the external thread 321 .

The reaming part 4 includes a pile foundation head 41 extending from the bottom of the pile foundation 31, a cement slurry layer 42 covering the inner wall of the pile foundation head 41, and a concrete pile head filled in the cement slurry layer 42. 43.

In this embodiment, the concrete pile body 32 and the concrete pile head 43 are cast integrally.

The present invention also provides a construction method for the above-mentioned soil-squeezing reaming pile 300, 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 squeezed 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), the drilling tool also includes an enlarging head located at its bottom, the enlarging head has flaring teeth and a protruding opening, the enlarging head is driven to rotate in reverse by the drill rod, and the enlarging teeth pass through the protruding mouth The outlet protrudes outward, and the bottom of the pile foundation is enlarged through the flaring teeth, and after the pile foundation head is formed, the drilling tool is stopped;

(4) Drive the enlarging head to rotate in the forward direction again, so that the flaring teeth extend inward through the protruding opening and are accommodated in the protruding opening, then stop the drilling tool;

(5), the inner wall of the pile foundation head is sprayed to form a cement slurry layer;

(6) 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;

(7), the outer wall of the blocking ring includes an external thread, and the external thread forms an internal thread engaged with the external thread on the inner wall of the squeezed soil layer;

(8) When concrete is poured into the pile foundation, concrete is poured into the internal thread to complete the soil-squeezing and reaming pile.

The beneficial effects of the present invention are: the structure of the blocking ring is added, and the blocking ring performs a second extrusion on the hole wall of the extruded and expanded pile, preventing the soil from being unscrewed and directly extruded and expanded into a pile during the pile forming process, and the structure is novel , The quality of the pile is good, and it is not easy to hold back the drill; the soil between the piles has a compaction effect, the pile bearing capacity is high, and the surrounding environment will not be polluted; and the expanding head is set as a double-layer structure of the inner cylinder and the outer cylinder, Set the flaring teeth on the inner cylinder, and use the rotation of the expanding head to control the extension and contraction of the flaring teeth to complete the flaring of different soil properties. This structure is simple in design, low in cost, and effective, and is suitable for mass production and Promotional use.

What has been described above is only the embodiment of the present invention, and 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 (10)

1. A soil-squeezing reaming pile, characterized in that it comprises a soil-squeezing part and a reaming part positioned at the bottom of the soil-squeezing part, and the soil-squeezing part comprises a pile foundation and a concrete pile body filled in the pile foundation, and the pile The base includes a soil-extrusion layer located at its inner periphery, an internal thread formed on the inner wall of the earth-extraction layer, and the concrete pile body includes an external thread formed on its outer wall, and the internal thread is screwed to the external thread; The reaming portion includes a pile foundation head extending from the bottom of the pile foundation, a cement slurry layer covering the inner wall of the pile foundation head, and a concrete pile head filled in the cement slurry layer. 2. The soil-squeezing reaming pile according to claim 1, characterized in that, the concrete pile body and the concrete pile head are integrally poured and formed. 3. A construction method of soil-squeezing reaming pile, is characterized in that, comprises the 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 squeezed 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), the drilling tool also includes an enlarging head located at its bottom, the enlarging head has flaring teeth and a protruding opening, the enlarging head is driven to rotate in reverse by the drill rod, and the enlarging teeth pass through the protruding mouth The outlet protrudes outward, and the bottom of the pile foundation is enlarged through the flaring teeth, and after the pile foundation head is formed, the drilling tool is stopped; (4) Drive the enlarging head to rotate in the forward direction again, so that the flaring teeth extend inward through the protruding opening and are accommodated in the protruding opening, then stop the drilling tool; (5), the inner wall of the pile foundation head is sprayed to form a cement slurry layer; (6) 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; (7), the outer wall of the blocking ring includes an external thread, and the external thread forms an internal thread engaged with the external thread on the inner wall of the squeezed soil layer; (8) When concrete is poured into the pile foundation, concrete is poured into the internal thread to complete the soil-squeezing and reaming pile. 4. A drilling tool, characterized in that: it includes a drill rod with a drill bit and an expanding head sleeved on the drill bit, the expanding head includes flared teeth, an inner cylinder and an outer cylinder sleeved on the inner cylinder, and the The inner cylinder and the outer cylinder are arranged at intervals, the inner cylinder includes a buckle portion, the outer cylinder includes a limiting portion and a protruding opening, and the number of the limiting portions is two and is formed at intervals inside the outer cylinder On the peripheral edge, the buckle part is formed on the outer peripheral edge of the inner cylinder and is clamped between the two limiting parts, the protruding opening is a through hole penetrating the outer cylinder, and the flaring teeth It includes a movable connection part with the inner cylinder and a flaring part extending from the connection part and inserted into the protruding opening; The drill rod also includes a body, a blocking ring and a helical column connected in sequence. 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 with the central axis. It is larger than the screw column and the body, and the thread depth around the outer wall of the screw column is greater than the thread depth of the outer wall of the blocking ring. 5 . The drilling tool according to claim 4 , wherein the thread circumference of the outer wall of the barrier ring is the same as the thread circumference of the outer wall of the helical column. 5 . 6. The drilling tool according to claim 4, wherein the inner cylinder and the outer cylinder are hollow cylinders with concentric axes. 7. The drilling tool according to claim 5, characterized in that: the inner cylinder and the outer cylinder pass through the limiting part and the buckle part and are in a circle between the two limiting parts. Reverse coaxial rotation within the arc length range. 8. The drilling tool according to claim 5, characterized in that: the length of the arc chord between the two limiting parts is smaller than the length of the flaring part. 9 . The drilling tool according to claim 4 , wherein the flared portion protrudes and contracts along the direction of the protruding opening through the relative rotation of the inner cylinder and the outer cylinder. 10 . 10 . The drilling tool according to claim 4 , wherein the limiting portion and the locking portion are formed on the same horizontal plane. 11 .