WO2021208270A1

WO2021208270A1 - Self-drilling type tubular column supporting device and method therefor

Info

Publication number: WO2021208270A1
Application number: PCT/CN2020/100738
Authority: WO
Inventors: 杨忠年; 刘泉维; 黄成�; 李克先; 刘林胜; 时伟; 凌贤长
Original assignee: 青岛理工大学; 青岛市地铁六号线有限公司; 青岛市地铁一号线有限公司
Priority date: 2020-04-17
Filing date: 2020-07-08
Publication date: 2021-10-21
Also published as: CN111472688A; JP7103613B2; JP2022527678A; CN111472688B

Abstract

A self-drilling type tubular column supporting device and a method therefor. The device is a tubular pile drilling and grouting supporting operating device in which a supporting system can be easily assembled and disassembled, so as to achieve a large-diameter high-efficiency multi-soil-condition geotechnical engineering construction system, a device design and operating using method. The self-drilling type tubular column supporting device comprises a power drilling machine (1) mounted on a drill bit support (6), a pumping bent pipe (2) and a tubular pile connector (3) are respectively communicated with the power drilling machine; the tubular pile connector has a hollow tubular structure, and the perpendicular two ends of the tubular pile connector are respectively connected to the power drilling machine and a tubular pile (4); a pull rod (7) is sequentially in penetrating connection to the power drilling machine, the tubular pile connector, and the tubular pile in the perpendicular direction; the perpendicular bottom end of the pull rod is connected to a liftable drill bit (5); the liftable drill bit comprises a shaft body (5-7) which allows for the pull rod to be in penetrating connection and is located on the axial center; the peripheral side of the shaft body is pivotally connected to a plurality of drilling tooth holders (5-2) having drilling tooth bodies (5-1); pivotal connecting points, along the peripheral side of the shaft body, of the drilling tooth holders have a trend of peripheral movement. When the pull rod moves upwards in the perpendicular direction, the drilling tooth holders are horizontally pushed to and stored at the bottom end of the tubular pile.

Description

Self-drilling pipe string supporting device and method

Technical field

The invention relates to a self-drilling support system and a construction method for soil pipe pile construction, and belongs to the field of building construction.

Background technique

With the rapid development of China's economy, the construction of various buildings is in the ascendant. Prefabricated pipe piles are widely used in various pile foundations and foundation treatment projects. Especially with the development of marine island and reef projects in recent years, large-diameter pipe piles have obvious reinforcement effects on island and reef foundations. With the diversification of pile types and construction environment, there are endless innovations in the improvement of precast pipe pile types and construction methods in the domestic industry. At present, the main pile foundation construction in actual engineering includes the following methods:

Hammering method: The most widely used method of pile sinking in pile foundation construction. The impact energy of the hammer overcomes the resistance of the soil to the pile and sinks the pile to a predetermined depth. Generally suitable for hard plastic and soft plastic cohesive soil. When it is difficult to use in sand or gravel soil, drilling method and water flushing method can be supplemented. Commonly used pile hammers include steam hammer and diesel hammer.

Vibration method: The vibration method of pile driving is a high-power electric vibration exciter that generates vibrations with a frequency of 700 to 900 times/min, which overcomes the resistance of the soil to the pile and makes the pile sink into the soil. It is generally suitable for sinking steel sheet piles in sand, and it can also be used for sinking prefabricated reinforced concrete pipe piles with water flushing method. The common specifications of the vibrator used for vibrating piles are 20 tons and 40 tons. At present, the pile driving head with a high frequency of 10,000 times/min is used, which has low vibration and noise and high pile driving speed.

Press-in method: The press-in method has the advantages of no noise, no vibration, and low cost. Commonly used pile drivers are 80 tons and 120 tons. The pressed pile needs to use the equipment's own weight and counterweight to press the pile into the soil through the transmission mechanism, so it is only used for soft soil foundation.

Water jetting method: Auxiliary method of two pile sinking methods, hammering and vibration. During construction, a high-pressure water pump is used to generate a high-speed jet, which destroys or reduces the resistance of the soil, making it easier for hammering or vibration to sink the pile into the soil. The water jetting method is mostly suitable for sandy soil or gravel soil, and the depth of water washing needs to be controlled when using it.

With the needs of the project, large-diameter pipe piles are more suitable for actual engineering needs, but the current construction of various large-diameter pipe piles also has many technical problems: (1) The existing pipe pile construction technology cannot achieve the high efficiency of large-diameter pipe piles. construction. For example, static pressure, hammering and other construction techniques are common in the construction of precast piles with a diameter of less than 600mm. Due to the limitations of equipment size, pile strength, and construction difficulty, traditional precast pile construction techniques cannot effectively complete the construction of precast piles with a diameter of 800mm or more. (2) It is more difficult to construct in hard ground such as clay and dense sand. The traditional static pressure, hammering and other construction techniques use soil squeezing construction method, which is more difficult to construct in harder formations such as clay and dense sand. (3) Precast pile implantation methods such as pipe drilling and jet-grouting stiffened piles are complicated in technology and low in efficiency. The existing precast pile implantation method mostly introduces Japanese technology, which is not suitable for domestic construction in terms of equipment size and process complexity.

Therefore, a new type of large-diameter pipe pile construction technology is urgently needed in China to fill the current gap in the project. In view of this, this patent application is hereby filed.

Summary of the invention

The self-drilling pipe string support device and method thereof of the present invention solve the above-mentioned problems in the prior art and provide a pipe pile drilling and grouting support operation device that is easy to assemble and disassemble the support system. Thereby, a geotechnical construction system, equipment design and operation method with large diameter, high efficiency and various soil conditions can be realized.

In order to achieve the above design objectives, the self-drilling pipe string support device described in this application includes a power drill installed on a drill bit support, and the pumping elbow and the pipe pile connector are respectively connected to the power drill;

Among them, the pipe pile connector has a hollow tubular structure, and its vertical ends are respectively connected to the power drilling rig and the pipe pile; The bottom end is connected with a liftable drill bit; the liftable drill bit includes a shaft body located in the axial center through which the pull rod is connected, and a plurality of drill tooth brackets with drill tooth bodies are pivotally connected to the outer circumference of the shaft body; The pivotal connection point of the drill tooth bracket along the outer circumference of the shaft body has a trend of circumferential movement; when the pull rod moves upward in the vertical direction, the drill tooth bracket is horizontally pushed toward and received at the bottom end of the pipe pile.

Further, the top end of the pipe pile connector is fixedly connected to the power drill through a screw thread, and the bottom end of the pipe pile connector is provided with a pipe pile connector bottom cover for nested connection to the top end of the pipe pile.

Further, the bottom end of the pipe pile is provided with an internal annular bottom groove. When the drill tooth bracket is stretched upward, the drill tooth bracket is positioned horizontally between the shaft body and the bottom groove, and the drill bit can be lifted. It is integrally fixedly connected to the bottom end of the pipe pile.

Further, a clamp protrusion is formed in the outer circumferential direction of the shaft of the pullable drill bit; a clamp groove is formed at the horizontal inner end of the drill tooth bracket, and the clamp protrusion and the clamp groove form a mutual fit The horizontal outer end of the drill tooth bracket is formed with a supporting protrusion, and the supporting protrusion and the bottom groove form a nesting structure that cooperates with each other; the horizontal inner end of the drill tooth bracket is connected to the shaft body through a shaft pivot.

Furthermore, the upper end of the pull rod end and the lower end of the pull rod end are sleeved on the upper and lower ends of the pull rod and the shaft body.

Applying the above-mentioned self-drilling pipe string supporting device using method includes the following steps:

1) Equipment installation

The power drilling rig is fixedly installed on the drilling rig bracket, and the pumping elbow is set on the power drilling rig. The inner cavity of the pumping elbow is connected with the pipe pile connector and the inner cavity of the pipe pile, so as to realize continuous grouting into the ring pipe pile; The pipe pile connector and the power drill are fixedly connected by threads, and the power drill rig is connected with the pipe pile through the pipe pile connector;

2) Drilling operation

The power drilling rig is powered on, and the power drilling rig drives the pipe pile to rotate through the pipe pile connector. The liftable drill at the bottom of the pipe pile rotates simultaneously and simultaneously. The drill tooth body continuously cuts the soil and the pipe pile continuously extends into the soil along the vertical direction. In the body

3) Separate pipe pile

After drilling, the pull rod is lifted up, and the lower end of the pull rod end lifts the shaft body to drive the supporting boss to rotate counterclockwise. As the tie rod continues to be pulled, the supporting boss and the rotating shaft are used as fulcrums, and the drill tooth bracket is guided counterclockwise based on the principle of leverage. Rotation, so as to promote the clamp protrusion and the clamp groove to disengage with the rotation of the rotating shaft, and the drill tooth bracket is folded inward as a whole.

The supporting protrusion and the bottom groove are disengaged, and the drill bit can be lifted to move up from the inner cavity of the pipe pile under the drive of the tie rod.

4) Repeat the job

After the pipe piles are separated, the overall equipment of the drilling rig runs to the next position by itself; then the cement slurry is injected into the pipe pile cavity until it is filled, and finally the pipe pile is installed.

At the new installation station, reconnect the pipe pile connector, the pullable drill bit and the tie rod to install a new pipe pile, and repeat the above operation steps until the specified depth is drilled.

As mentioned above, the self-drilling pipe string supporting device and method of the present application have the advantages of simple and easy overall structure, easy to disassemble and reassemble; it can be adapted to large diameter and relatively large diameter under various foundation soil conditions. Large-depth pipe pile drilling and grouting operation construction, thereby effectively saving the construction period, reducing the difficulty of on-site operation and construction cost.

Description of the drawings

This application will now be further explained in conjunction with the following drawings;

Figure 1 is a schematic diagram of the overall structure of the self-drilling pipe string supporting device;

Figure 2 is a schematic diagram of a front view and a top view comparison of the pipe pile connector;

Figure 3 is a diagram of the use state of the pipe pile connector connected to the top of the pipe pile;

Figure 4 is a schematic diagram of the structure of a pipe pile;

Figure 5 is a schematic diagram of the connection between the pullable drill bit and the pull rod in use;

Figure 6 is a schematic top view of the pullable drill bit;

Figure 7 is a schematic diagram of the connection between the pull rod and the liftable drill bit when the pull rod is retracted upward;

Figure 8 is a schematic diagram of the self-drilling pipe string support system after completion.

As shown in Figure 1 to Figure 8, 1. Power drilling rig; 2. Pumping elbow; 3. Pipe pile connector; 3-1. Pipe pile connector bottom cover; 4. Pipe pile; 4-1. Bottom concave Groove; 5. Pullable drill bit; 5-1. Drill tooth body; 5-2 Drill tooth bracket; 5-3, Clamp projection; 5-4, Clamp groove; 5-5, Rotating shaft; 5- 6. Supporting convex head; 5-7. Shaft body; 6. Drill support; 7. Pull rod; 7-1. Upper end of pull rod end; 7-2. Lower end of pull rod end.

Detailed ways

Example 1, in order to further illustrate the technical means adopted by this application to achieve the intended purpose of the invention, the following more preferred implementation schemes are now proposed in conjunction with the accompanying drawings.

The self-drilling pipe string support device described in the present application provides a new type of pipe string support system and combines the existing large-diameter pipe pile special drilling equipment and special ring pipe piles, mainly including: The power drilling rig 1, the pumping elbow 2 and the pipe pile connector 3 on the upper side are respectively connected to the power drilling rig 1.

Among them, the pipe pile connector 3 has a hollow tubular structure, and its vertical ends are respectively connected to the power drill 1 and the pipe pile 4;

The tie rod 7 sequentially penetrates the power drill 1, the pipe pile connector 3 and the pipe pile 4 in the vertical direction, and the vertical bottom end of the tie rod 7 is connected with a liftable drill bit 5;

The pullable drill bit 5 includes a shaft body 5-7 which is connected through the accommodating rod 7 and is located in the axial center. A plurality of drill tooth brackets with drill tooth bodies 5-1 are pivotally connected to the outer circumference of the shaft body 5-7. 5-2;

The pivotal connection point of the drill tooth bracket 5-2 along the outer circumference of the shaft body 5-7 has a tendency to move in a circumferential direction;

When the pull rod 7 moves upward in the vertical direction, the drill tooth bracket 5-2 is pushed horizontally and received at the bottom end of the pipe pile 4.

The pipe pile connector 3 has its top end fixedly connected to the power drill 1 through threads, and its bottom end is provided with a pipe pile connector bottom cover 3-1 for nested connection to the top end of the pipe pile 4.

The bottom end of the pipe pile 4 is provided with an internal annular bottom groove 4-1. When the drill tooth bracket 5-2 is stretched upward, the drill tooth bracket 5-2 can be horizontally positioned on the shaft body 5-7 , Between the bottom grooves 4-1, so that the pullable drill bit 5 is integrally fixedly connected to the bottom end of the pipe pile 4.

A clamp protrusion 5-3 is formed in the outer circumferential direction of the shaft 5-7 of the liftable drill bit 5; a clamp groove 5-4 is formed at the horizontal inner end of the drill tooth bracket 5-2, and the clamp The protruding head 5-3 and the clamp groove 5-4 form a mutually matched nesting structure; the horizontal outer end of the drill tooth bracket 5-2 is formed with a supporting protruding head 5-6, the supporting protruding head 5-6 and the bottom groove 4-1 Form a nested structure that cooperates with each other;

The horizontal inner end of the drill tooth bracket 5-2 is pivotally connected to the shaft body 5-7 through the rotating shaft 5-5.

On the pull rod 7, the upper and lower ends of the shaft body 5-7 are sleeved with a pull rod end upper end 7-1 and a pull rod end lower end 7-2.

The self-drilling pipe string support device using the above-mentioned structural design scheme is used to connect and install the special large-diameter annular pipe pile 4 on the drilling rig 1 after determining the location to be piled. The power drilling rig 1 is driven by the drilling rig after positioning The ring pile 4 rotates simultaneously and integrally. The liftable drill bit 5 fits with the bottom end of the pipe pile 4. The pipe pile 4 rotates and drives the drill bit to rotate together. During the continuous drilling and rotation of the ring pipe pile 4, the drill tooth body 5-1 will break the inner and outer pipe walls. Soil or rock mass. So as to realize the geotechnical engineering construction in various soil foundation conditions such as sand, clay, gravel and so on.

Specifically, the method of using the self-drilling pipe string support device includes the following steps:

1) Equipment installation

As shown in Figure 1, the drilling rig support 6 is fixedly installed with the power drilling rig 1, and the pumping elbow 2 is set on the power drilling rig 1. The inner cavity of the pumping elbow 2 is in communication with the inner cavity of the pipe pile connector 3 and the pipe pile 4 , So as to realize the function of continuous grouting into the annular pipe pile 4. Wherein, the pipe pile connector 3 and the power drill 1 are fixedly connected by threads, and the power drill 1 is connected with the pipe pile through the pipe pile connector 3, thereby driving the pipe pile 4 to rotate integrally and synchronously.

As shown in Figures 2 to 4, the pipe pile connector 3 is connected to the pipe pile 4 through the pipe pile connector bottom cover 3-1, and the pipe pile connector bottom cover 3-1 is integrally stuck at the end of the pipe pile 4 , The fit between the surface and the surface ensures that the two are fixed together.

As shown in Figures 4 to 6, the bottom groove 4-1 of the pipe pile 4 fits with the supporting protrusion 5-5 of the liftable drill bit 5, so as to fix the liftable drill bit 5 and drive the liftable drill bit 5 to be integrated and synchronized The ground rotation is used to drive the drill tooth body 5-1 on the drill tooth bracket 5-2 to perform rock and soil cutting operations.

The clamp boss 5-3 installed on the shaft 5-7 and the clamp groove 5-4 are connected by the rotating shaft 5-5, and the two are fit together by the extrusion between the surfaces to ensure the drill tooth bracket 5-2 The horizontal stretch.

As shown in Figures 1 and 7, the tie rod 7 penetrates the entire device and is fixed integrally with the pullable drill bit 5. The upper end 7-1 of the tie rod end ensures the horizontal positioning of the drill tooth bracket 5-2.

2) Drilling operation

The power rig 1 is powered on, and the power rig 1 drives the pipe pile 4 to rotate through the pipe pile connector 3. The liftable drill bit 5 at the bottom of the pipe pile 4 rotates simultaneously and integrally, and the drill tooth body 5-1 continuously cuts the soil and pipe. The pile 4 continuously extends into the soil in the vertical direction.

3) Separate pipe pile

After drilling, the tie rod 7 is lifted up, and the lower end 7-2 of the tie rod end lifts the shaft 5-7, driving the supporting projection 5-6 to rotate counterclockwise. As the tie rod 7 continues to be pulled, the supporting projection 5-6 and The rotating shaft 5-5 is used as a fulcrum, and the principle of lever guides the drill tooth bracket 5-2 to also rotate counterclockwise, thereby prompting the clamp boss 5-3 and the clamp groove 5-4 to disengage with the rotation of the rotating shaft 5-5, and the drill The tooth bracket 5-2 is folded inward as a whole.

As shown in FIG. 7, the supporting protrusion 5-6 and the bottom groove 4-1 are disengaged, and the liftable drill bit 5 is moved up from the inner cavity of the pipe pile 4 under the drive of the tie rod 7. The pipe pile connector 3 and the pipe pile 4 are disengaged by the upper end 7-1 of the pull rod end driving the pipe pile connector bottom cover 3-1 to move upward and out of the inner cavity of the pipe pile 4.

4) Repeat the job

As shown in Figure 8, after the pipe piles are separated, the overall equipment of the drilling rig runs to the next position by itself; then the cement slurry is injected into the inner cavity of the pipe pile 4 until it is filled, and finally the pipe pile is installed.

At the new installation station, reconnect the pipe pile connector 3, the pullable drill bit 5 and the tie rod 7 to install a new pipe pile 4, and repeat the above operation steps until the specified depth is drilled.

As described above, in conjunction with the content of the scheme given in the drawings and the description, similar technical schemes can be derived. However, all the content of the solution that does not deviate from the structure of the present invention still belongs to the right scope of the technical solution of the present application.

Claims

A self-drilling pipe string supporting device, which is characterized in that it comprises a power drill installed on a drill bit support, and the pumping elbow and the pipe pile connector are respectively connected to the power drill;

Among them, the pipe pile connector has a hollow tubular structure, and its vertical ends are respectively connected to the power drill and the pipe pile;

The tie rod runs through and connects the power drill, the pipe pile connector and the pipe pile in sequence in the vertical direction, and the vertical bottom end of the tie rod is connected with a lifting drill bit;

The pullable drill bit includes a shaft body that contains the tie rod and is located in the axial center, and is pivotally connected with a number of drill tooth brackets with drill tooth bodies on the outer circumference of the shaft body;

The pivotal connection point of the drill tooth bracket along the outer circumference of the shaft body has a tendency of circumferential movement;

When the pull rod moves upward in the vertical direction, the drill tooth bracket is pushed horizontally and received at the bottom end of the pipe pile.
The self-drilling pipe string supporting device according to claim 1, wherein the top end of the pipe pile connector is fixedly connected to the power drill through a screw thread, and the bottom end is provided for nesting connection to the pipe pile The bottom cover of the pipe pile connector at the top.
The self-drilling pipe string support device according to claim 1, characterized in that: the bottom end of the pipe pile is provided with an internal annular bottom groove, when the drill tooth bracket is stretched upward, the drill tooth bracket is It is positioned horizontally between the shaft body and the bottom groove, and the liftable drill bit is integrally fixed and connected to the bottom end of the pipe pile.
The self-drilling pipe string support device according to claim 1, 2 or 3, characterized in that: a clamp protrusion is formed on the outer circumference of the shaft of the pullable drill bit;

The horizontal inner end of the drill tooth bracket is formed with a clamp groove, and the clamp protrusion and the clamp groove form a nested structure that cooperates with each other; the horizontal outer end of the drill tooth bracket is formed with a supporting protrusion, and the supporting protrusion and the bottom concave The grooves form a nested structure that cooperates with each other;

The horizontal inner end of the drill tooth bracket is connected to the shaft body through a rotating shaft pivot.
The self-drilling pipe string support device according to claim 4, characterized in that: the upper end of the pull rod end and the lower end of the pull rod end are sleeved on the upper and lower ends of the pull rod and the shaft body.
A method for using the self-drilling pipe string supporting device according to claims 1 to 5, characterized in that it comprises the following steps:

1) Equipment installation

The power drilling rig is fixedly installed on the drilling rig bracket, and the pumping elbow is set on the power drilling rig. The inner cavity of the pumping elbow is connected with the pipe pile connector and the inner cavity of the pipe pile, so as to realize continuous grouting into the ring pipe pile; The pipe pile connector and the power drill are fixedly connected by threads, and the power drill rig is connected with the pipe pile through the pipe pile connector;

2) Drilling operation

The power drilling rig is powered on, and the power drilling rig drives the pipe pile to rotate through the pipe pile connector. The liftable drill at the bottom of the pipe pile rotates simultaneously and simultaneously. The drill tooth body continuously cuts the soil and the pipe pile continuously extends into the soil along the vertical direction. In the body

3) Separate pipe pile

After drilling, the pull rod is lifted up, and the lower end of the pull rod end lifts the shaft body to drive the supporting boss to rotate counterclockwise. As the tie rod continues to be pulled, the supporting boss and the rotating shaft are used as fulcrums, and the drill tooth bracket is guided counterclockwise based on the principle of leverage. Rotate, so that the clamp protruding head and the clamp groove will disengage with the rotation of the shaft, and the drill tooth bracket will be folded inward as a whole;

The supporting protrusion is separated from the bottom groove, and the drill bit can be lifted to move up from the inner cavity of the pipe pile under the drive of the tie rod;

4) Repeat the job

After the pipe piles are separated, the overall equipment of the drilling rig runs to the next position by itself; then the cement slurry is injected into the pipe pile cavity until it is filled, and finally the pipe pile is installed;

At the new installation station, reconnect the pipe pile connector, the pullable drill bit and the tie rod to install a new pipe pile, and repeat the above operation steps until the specified depth is drilled.