CN111472688A - Self-drilling type pipe column supporting device and method thereof - Google Patents

Abstract

The invention relates to a self-drilling tubular pile supporting device and a method thereof, in particular to a tubular pile drilling and grouting supporting operation device which is easy to assemble and disassemble a supporting system, thereby realizing a geotechnical engineering construction system with large diameter, high efficiency and various soil body conditions, and an equipment design and operation use method. The pipe pile drilling machine comprises a power drilling machine arranged on a drill bit bracket, wherein a pumping bent pipe and a pipe pile connector are respectively communicated with the power drilling machine; the tubular pile connector is provided with a hollow tubular structure, and the vertical two ends of the tubular pile connector are respectively connected with the power drilling machine and the tubular pile; the pull rod sequentially penetrates through the power drilling machine, the tubular pile connector and the tubular pile along the vertical direction, and a liftable drill bit is connected to the vertical bottom end of the pull rod; the liftable drill bit comprises a shaft body which is used for accommodating the pull rod to penetrate and is connected and positioned at the axial center, and a plurality of drill tooth supports with drill tooth bodies are pivotally connected on the outer peripheral side of the shaft body; the drill tooth bracket has the tendency of circumferential movement along the pivot connection point on the outer circumferential side of the shaft body; when the pull rod moves upwards along the vertical direction, the drill tooth bracket is horizontally pushed to and is accommodated at the bottom end of the tubular pile.

Description

Self-drilling tubular string support device and method thereof

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 my country's economy, the construction of various buildings is in the ascendant. Prefabricated pipe piles are widely used in various types of pile foundations and foundation treatment projects. Especially with the development of marine island reef engineering in recent years, large-diameter pipe piles have obvious reinforcement effects on island reef foundations. With the diversification of pile types and construction environments, innovations in the domestic industry for the improvement of prefabricated tubular piles and their construction methods emerge one after another. At present, the main pile foundation construction in actual engineering includes the following methods:

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

Vibration method: Vibration method pile driving is a high-power electric vibration exciter that generates vibrations with a frequency of 700 to 900 times per minute to overcome the resistance of the soil to the pile and sink the pile into the soil. It is generally suitable for submerged steel sheet piles in sandy soil, and can also be submerged into prefabricated reinforced concrete pipe piles with the aid of water flushing method. The common specifications of vibratory machines for vibratory pile driving are 20 tons and 40 tons. At present, the pile driving head with a high frequency of 10,000 times per minute is used, which has low vibration and noise and fast pile driving.

Press-in method: The press-in method has the advantages of no noise, no vibration, and low cost. There are two types of pile drivers commonly used, 80 tons and 120 tons. The pile pressing needs to rely on the weight of the equipment and the counterweight, and the pile is pressed into the soil through the pressure of the transmission mechanism, so it is only used for soft soil foundations.

Water jetting method: an auxiliary method for the two pile driving methods of hammering and vibration. During construction, high-pressure water pumps are used to generate high-speed jets, which destroy or reduce the resistance of the soil, making it easier for the piles to sink into the soil by hammering or vibration. The water jet method is mostly suitable for sandy soil or gravel soil, and it is necessary to control the depth of water flushing when using it.

With the needs of the project, large-diameter pipe piles are more and more suitable for actual engineering needs, but there are also many technical problems in the construction of various types of large-diameter pipe piles: (1) The existing pipe pile construction technology cannot achieve high-efficiency large-diameter pipe piles. construction. For example, construction techniques such as static pressure and hammering are more common in the construction of precast piles with a diameter of less than 600mm. Due to the limitations of equipment volume, pile strength, construction difficulty and other reasons, traditional precast pile construction techniques cannot effectively complete the construction of precast piles with a diameter of more than 800mm. (2) It is more difficult to construct in hard strata such as clay and dense sand layers. The traditional construction techniques such as static pressure and hammering use the extruded soil construction method, which is difficult to construct in hard strata such as clay and dense sand layers. (3) Prefabricated pile implantation methods such as drilling with pipe and rotary jet stirring and stiffening piles are complicated in technology and low in efficiency. Most of the existing prefabricated pile implantation methods are imported from Japan, which are not suitable for domestic construction in terms of equipment volume and process complexity.

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

SUMMARY OF THE INVENTION

The self-drilling pipe string support device and the method thereof of the present invention solve the problems existing 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, Therefore, a geotechnical engineering 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 purpose, the self-drilling pipe string support device described in the present application includes a power drilling rig installed on the drill bit bracket, and the pumping elbow and the pipe pile connector are respectively connected to the power drilling rig;

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 pullable drill bit; the pullable drill bit includes a shaft body located in the axial center for accommodating the through connection of the pull rod, and a plurality of drill tooth brackets with drill tooth bodies are pivotally connected on the outer peripheral side of the shaft body; the said The pivot connection point along the outer peripheral side of the shaft body of the drill tooth bracket has a tendency of circumferential movement; when the tie rod moves vertically upward, the drill tooth bracket is pushed horizontally 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 drilling rig through threads, 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 inner annular bottom groove. When the drill tooth bracket is stretched upward, the drill tooth bracket is horizontally positioned between the shaft body and the bottom groove, and the drill bit can be pulled up. It is integrally fixedly connected to the bottom end of the pipe pile.

Further, a hoop protrusion is formed on the outer circumferential direction of the shaft body of the pullable drill bit; a hoop groove is formed on the horizontal inner end of the drill tooth bracket, and the hoop protrusion and the hoop groove are formed to cooperate with each other. The horizontal outer end of the drill tooth bracket is formed with a support boss, and the support boss 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 the rotating shaft pivot.

Further, the upper and lower ends of the tie rod and the upper and lower ends of the shaft body are sleeved with the upper end of the tie rod end and the lower end of the tie rod end.

The application method of the self-drilling pipe string support device as above includes the following steps:

1) Equipment installation

The drilling rig bracket is fixedly installed with the power drilling rig, and the pumping elbow is arranged on the power drilling rig, and 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 annular pipe pile; The pipe pile connector and the power drilling rig are fixedly connected through threads, and the power drilling rig is connected with the pipe pile through the pipe pile connector;

2) Drilling operation

The power drilling rig is powered on and turned on, the power drilling rig drives the pipe pile to rotate through the pipe pile connector, the pullable drill bit at the bottom of the pipe pile rotates synchronously at the same time, the drill body continuously cuts the rock and soil, and the pipe pile continuously extends into the soil vertically. in the body;

3) Separate pipe pile

After the drilling is completed, the tie rod is lifted up, and the lower end of the tie rod end lifts the shaft body, which drives the support boss to rotate counterclockwise. As the tie rod continues to be pulled, the support boss and the rotating shaft serve as the fulcrum, and the drill tooth bracket is guided counterclockwise based on the principle of leverage. Rotation, so that the collar of the clamp and the groove of the clamp are disengaged along with the rotation of the rotating shaft, and the whole drill bracket is folded inward.

The support protruding head and the bottom groove are disengaged, and the pulling drill bit can be moved up from the inner cavity of the pipe pile under the driving of the tie rod.

4) Repeat the job

After the pipe pile is separated, the whole drilling rig equipment runs to the next position by itself; and then injects cement slurry into the inner cavity of the pipe pile until it is full, and finally the pipe pile is installed.

In 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 support device and the method thereof of the present application have the advantages that the overall structure is simple and easy to implement, easy to disassemble and reassemble again; The large-depth pipe pile drilling and grouting construction can effectively save the construction period and reduce the difficulty and construction cost of on-site operations.

Description of drawings

The present application will now be further described in conjunction with the following drawings;

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

Fig. 2 is the front view and the top view comparison schematic diagram of the pipe pile connector;

Fig. 3 is the use state diagram of the pipe pile connector connected to the top of the pipe pile;

Fig. 4 is the structural representation of pipe pile;

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

Fig. 6 is the top view schematic diagram of the drill bit that can be pulled;

Figure 7 is a schematic diagram of the connection with the pullable drill bit when the pull rod is retracted upward;

Figure 8 is a schematic diagram of the self-drilling tubular 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 Slot; 5. Pullable drill bit; 5-1, Drill tooth body; 5-2 Drill tooth bracket; 5-3, Clamp boss; 5-4, Clamp groove; 5-5, Rotating shaft; 6. Support boss; 5-7, shaft body; 6, drill bracket; 7, tie rod; 7-1, upper end of tie rod end; 7-2, lower end of tie rod end.

Detailed ways

Example 1, in order to further illustrate the technical means adopted by the present application to achieve the predetermined purpose of the invention, the following preferred embodiments are now proposed with reference to the accompanying drawings.

The self-drilling pipe string support device described in the present application provides a new pipe string support system and combines the existing large-diameter pipe pile special drilling rig equipment and special annular pipe pile, and mainly includes: The power drilling rig 1 , the pumping elbow 2 and the pipe pile connector 3 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 drilling rig 1 and the pipe pile 4;

The tie rod 7 is vertically connected to the power drilling rig 1, the pipe pile connector 3 and the pipe pile 4 in sequence, and a pullable drill bit 5 is connected to the vertical bottom end of the tie rod 7;

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, and is pivotally connected with a plurality of drill tooth brackets with drill tooth bodies 5-1 on the outer peripheral side of the shaft body 5-7. 5-2;

The said drill tooth bracket 5-2 has a tendency to move in the circumferential direction along the pivot connection point on the outer peripheral side of the shaft body 5-7;

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

The top of the pipe pile connector 3 is fixedly connected to the power drilling rig 1 through threads, and the bottom end of the pipe pile connector 3 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 inner annular bottom groove 4-1. When the drill bracket 5-2 is stretched upward, the drill 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 and fixedly connected to the bottom end of the pipe pile 4.

A clamp boss 5-3 is formed circumferentially on the outer side of the shaft body 5-7 of the pullable drill bit 5; a clamp groove 5-4 is formed at the horizontal inner end of the drill bracket 5-2, The convex head 5-3 and the clamp groove 5-4 form a nesting structure that cooperates with each other; the horizontal outer end of the drill tooth bracket 5-2 is formed with a supporting convex head 5-6, and the supporting convex head 5-6 and the bottom groove are formed 4-1 Form a nested structure that cooperates with each other;

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

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

The self-drilling pipe string support device applying the above structural design scheme is used. After determining the position to be piled, first connect and install the special large-diameter annular pipe pile 4 on the drilling rig 1. After the power drilling rig 1 is positioned, it is driven by the drilling rig. The annular pipe pile 4 rotates synchronously as a whole. The pullable drill bit 5 fits with the bottom end of the pipe pile 4, and the pipe pile 4 rotates and drives the drill bit to rotate together. During the continuous drilling and rotation of the annular pipe pile 4, the drill body 5-1 will break the inner and outer parts of the pipe wall. Soil or rock mass. So as to realize the construction of geotechnical engineering in various soil conditions such as gravel, clay, gravel, etc.

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

1) Equipment installation

As shown in FIG. 1 , the power drilling rig 1 is fixedly installed on the drilling rig bracket 6 , the pumping elbow 2 is arranged on the power drilling rig 1 , and the inner cavity of the pumping elbow 2 is communicated 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 . The pipe pile connector 3 and the power drilling rig 1 are fixedly connected by threads, and the power drilling rig 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 FIGS. 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 clamped at the end of the pipe pile 4 , The surface-to-surface fit ensures that the two are fixed together.

As shown in FIGS. 4 to 6 , the bottom groove 4-1 of the pipe pile 4 fits with the supporting protrusion 5-5 of the pullable drill bit 5, so as to fix the pullable drill bit 5 and drive the pullable drill bit 5 to be synchronously integrated. It is used to drive the drill body 5-1 on the drill bracket 5-2 to perform cutting geotechnical operations.

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

As shown in Fig. 1 and Fig. 7, the pull rod 7 runs through the whole device and is fixed with the pullable drill bit 5 as a whole, and the upper end 7-1 of the pull rod end ensures the horizontal positioning of the drill tooth bracket 5-2.

2) Drilling operation

The power drilling rig 1 is powered on, the power drilling rig 1 drives the pipe pile 4 to rotate through the pipe pile connector 3, the pullable drill bit 5 at the bottom of the pipe pile 4 rotates simultaneously and synchronously, and the drill body 5-1 continuously cuts the rock and soil, and the pipe The piles 4 are continuously extended vertically into the soil.

3) Separate pipe pile

After the drilling is completed, the tie rod 7 is lifted upward, and the lower end 7-2 of the tie rod end lifts the shaft body 5-7, which drives the support boss 5-6 to rotate counterclockwise. The rotating shaft 5-5 is used as a fulcrum, and the principle of the lever guides the drill tooth bracket 5-2 to rotate counterclockwise, so that the clamp head 5-3 and the clamp groove 5-4 are disengaged with the rotation of the rotating shaft 5-5. The tooth bracket 5-2 is folded inward as a whole.

As shown in FIG. 7 , the support protruding head 5-6 is disengaged from the bottom groove 4-1, and the pullable drill bit 5 is moved upward from the inner cavity of the pipe pile 4 under the driving of the pull rod 7. The disengagement of the pipe pile connector 3 and the pipe pile 4 is that the bottom cover 3-1 of the pipe pile connector is moved upward and separated from the inner cavity of the pipe pile 4 through the upper end 7-1 of the tie rod end.

4) Repeat the job

As shown in Figure 8, after the pipe pile is separated, the whole 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 pull rod 7 to install a new pipe pile 4, and repeat the above operation steps until the specified depth is drilled.

As mentioned above, similar technical solutions can be derived from the content of the solutions given in combination with the drawings and descriptions. However, any solution content that does not depart from the structure of the present invention still belongs to the right scope of the technical solution of the present application.

Claims (6)

1. A self-drilling pipe string support device, characterized in that: it comprises a power drilling rig installed on a drill bit support, and the pumping elbow and the pipe pile connector are respectively connected to the power drilling rig; Wherein, 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 tie rod runs through and connects the power drilling rig, the pipe pile connector and the pipe pile in sequence along the vertical direction, and the pullable drill bit is connected to the vertical bottom end of the tie rod; The pullable drill bit includes a shaft body located in the axial center that accommodates the through connection of the tie rod, and is pivotally connected with a plurality of drill tooth brackets with drill tooth bodies on the outer peripheral side of the shaft body; The drill tooth bracket has a tendency to move in the circumferential direction along the pivot connection point on the outer peripheral side of the shaft body; When the tie rod moves upward in the vertical direction, the drill bracket is pushed horizontally toward and received at the bottom end of the pipe pile. 2 . The self-drilling pipe string support device according to claim 1 , wherein the top end of the pipe pile connector is fixedly connected to the power drilling rig by means of threads, and the bottom end of the self-drilling pipe string is provided with a device for nested connection to the power drilling rig. 3 . Pile connector bottom cover at the top of the pipe pile. 3. The self-drilling pipe string support device according to claim 1, wherein the bottom end of the pipe pile is provided with an inner annular bottom groove, when the drill teeth bracket is stretched upward, the drill teeth The bracket is horizontally positioned between the shaft body and the bottom groove, and the pullable drill bit is integrally and fixedly connected to the bottom end of the pipe pile. 4. The self-drilling pipe string support device according to claim 1, 2 or 3, characterized in that: a collar boss is formed circumferentially on the outer side of the shaft body of the pullable drill bit; The horizontal inner end of the drill tooth bracket is formed with a clamp groove, and the clamp convex head and the clamp groove form a nesting structure that cooperates with each other; 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 the pivot shaft of the rotating shaft. 5 . The self-drilling pipe string support device according to claim 4 , wherein the upper and lower ends of the tie rod end and the lower end of the tie rod end are sleeved on the tie rod and the upper and lower ends of the shaft body. 6 . 6. A method of applying the self-drilling pipe string support device according to claims 1 to 5, characterized in that: comprising the following steps: 1) Equipment installation The drilling rig bracket is fixedly installed with the power drilling rig, and the pumping elbow is arranged on the power drilling rig, and 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 annular pipe pile; The pipe pile connector and the power drilling rig are fixedly connected through threads, and the power drilling rig is connected with the pipe pile through the pipe pile connector; 2) Drilling operation The power drilling rig is powered on and turned on, the power drilling rig drives the pipe pile to rotate through the pipe pile connector, the pullable drill bit at the bottom of the pipe pile rotates synchronously at the same time, the drill body continuously cuts the rock and soil, and the pipe pile continuously extends into the soil vertically. in the body; 3) Separate pipe pile After the drilling is completed, the tie rod is lifted up, and the lower end of the tie rod end lifts the shaft body, which drives the support boss to rotate counterclockwise. As the tie rod continues to be pulled, the support boss and the rotating shaft serve as the fulcrum, and the drill tooth bracket is guided counterclockwise based on the principle of leverage. Rotate, so that the collar boss and the collar groove are disengaged with the rotation of the rotating shaft, and the drill bracket is folded inward as a whole; The support protruding head and the bottom groove are disengaged, and the drill bit can be pulled up from the inner cavity of the pipe pile under the drive of the tie rod; 4) Repeat the job After the pipe pile is separated, the whole 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 until it is filled, and finally the pipe pile is installed; In 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.

Images