CN220015180U - A kind of hard rock formation pipe curtain and pipe construction device - Google Patents

Abstract

The utility model discloses a construction device for pipe curtains and pipes in hard rock formations, which includes a spiral drill rod, a down-the-hole impactor and a reaming drill bit. The spiral drill rod and the down-the-hole impactor are connected end-to-end and are installed in the steel pipe; the reaming drill bit The front end surface of the reamer bit is radially slidably connected with a number of slide blocks. A first annular step is provided on the outer circle of the front end of the reaming drill bit, and the first annular step is located behind the slide block; the front end of the steel pipe is fixedly connected with a pipe shoe, and the pipe shoe is A second annular step is provided on the inner circle, the front end of the reaming drill bit is set in the pipe shoe and the slider extends out of the pipe shoe, the rear end of the reaming drill bit is connected to the front end of the down-the-hole impactor, and the first annular step It abuts against the second annular step, so that when the reaming drill bit moves forward, it drives the steel pipe to move forward. This device realizes the construction of pipe curtains and pipes in hard rock formations, is simple to operate, and improves construction efficiency.

Description

A kind of hard rock formation pipe curtain and pipe construction device

Technical field

The utility model belongs to the technical field of pipe curtain construction, and specifically relates to a pipe curtain and pipe construction device in hard rock formations.

Background technique

The pipe curtain method uses steel pipes with larger diameters to be driven into the soil one by one and in rows according to the designed elevation, orientation, and slope. The steel pipes are sometimes densely arranged underground or connected with locks to form a curtain in advance to achieve the effect of advanced pre-support, thereby constructing large sections. Construction methods of underground spaces. The pre-support effect of the pipe curtain method is stronger than that of pipe sheds, grouting, horizontal jet spraying and other reinforcement methods. It is particularly effective in projects with shallow soil cover, environmental impact and settlement control requirements. It is widely used in railways and highways at home and abroad. , airports, industrial and civil buildings and other high-risk control projects.

At present, the main pipe curtain construction methods include: fixed (guided) directional drilling method, horizontal auger drilling method, rammed pipe construction method, pipe jacking method, micro tunnel construction method, etc. However, the above methods were mainly concentrated in soft soil strata in the past. In the construction of underground projects in hard soil strata, weak strata and silty strata, for the construction of hard rock strata, due to their high hardness, the "lead hole jacking method" of drilling first and then intubating is usually used, that is, First, use an ordinary drill bit slightly larger than the diameter of the steel pipe to drill to the design depth. After the hole is made, withdraw the drill bit and other drilling tools, and then use a drill rig or other jacking equipment to continuously jack the steel pipe to the design depth. However, this method cannot drill holes in a timely manner. The hole wall provides wall protection, so in areas where poor rock quality causes collapse, the steel pipe may not be able to enter the hole smoothly and the construction may not be completed smoothly.

Utility model content

In order to solve the above-mentioned problems existing in the prior art, the utility model provides a hard rock formation pipe curtain and pipe construction device. The technical problems to be solved by this utility model are achieved through the following technical solutions:

A hard rock formation pipe curtain and pipe construction device, including an auger drill rod, a down-the-hole impactor and a reaming drill bit. The auger drill rod and the down-the-hole impactor are connected end-to-end and installed in the steel pipe; the reaming drill bit A number of slide blocks are radially slidingly connected to the front end surface, and a first annular step is provided on the outer circle of the front end of the reaming drill bit, and the first annular step is located behind the slide block; the front end of the steel pipe is fixedly connected There is a pipe shoe, and a second annular step is provided on the inner circle of the pipe shoe. The front end of the reaming drill bit is arranged in the pipe shoe and the slider extends out of the pipe shoe. The rear end of the hole drill bit is connected to the front end of the down-the-hole impactor, and the first annular step abuts the second annular step, so that when the reaming drill bit moves forward, the steel pipe is driven to move forward.

Further, the front end surface of the reaming drill bit has a number of backward inclined chute evenly distributed in the radial direction, and the slide block is clamped in the chute and can slide freely along the chute.

Further, the rear end of the reaming drill bit is axially provided with an air inlet hole, and the front end of the reaming drill bit is provided with a first air outlet inclined outward, and the first air outlet hole is connected with the air inlet hole. Connected; a slag discharge groove is axially provided on the outer circumferential surface of the reaming drill bit between the adjacent slide blocks, and the air outlet of the first air outlet is located on the front end surface of the reaming drill bit between the adjacent slide blocks. And corresponds to the slag discharge tank.

Further, a second air outlet is provided at the front end of the reaming drill bit, the second air outlet is connected with the air inlet, and the air outlet of the second air outlet is located in the chute.

Further, balls are provided between the slide block and the chute.

Further, the auger drill rod and the down-the-hole impactor are connected through a reducing connector.

Beneficial effects of this utility model:

1. This construction device drives the auger drill rod through the drilling rig to drive the reaming drill bit to cut the hard rock, and breaks the rock through the down-the-hole impactor. It also uses the auger drill rod and high-pressure wind to discharge the rock slag out of the hole to achieve the geological conditions of the hard rock formation. At the same time, the annular step in the pipe shoe at the end of the steel pipe is used to cooperate with the annular step on the reaming drill to realize the construction of the pipe curtain and the pipe. The operation is simple and the construction efficiency is improved.

2. The reaming drill bit used in this construction device is a sliding block type reaming drill bit. The slide block on the reaming drill bit expands outwards under force during operation. After the operation is completed, it slides inward under force and exits the steel pipe smoothly. There is no need to press the pipe. A receiving well is set at the other end of the curtain, and the reaming drill bit can be reused, saving costs;

3. This construction device uses the high-pressure air delivered by the drill rig's own air compressor and the auger drill rod to jointly discharge slag, solving the problem of difficulty in slag discharge using high-pressure air alone during the construction of large-diameter pipe curtains (diameter greater than 200mm);

4. This construction device uses a reaming drill bit and a down-the-hole impactor to achieve hole formation in hard rock formations through the combined action of cutting and impact.

The utility model will be further described in detail below with reference to the accompanying drawings and examples.

Description of the drawings

Figure 1 is a schematic structural diagram of the utility model;

Figure 2 is a schematic structural diagram of the pipe shoe;

Figure 3 is a schematic diagram of the front structure of the reaming drill bit;

Figure 4 is a schematic cross-sectional structural diagram of A-A in Figure 3.

Explanation of reference symbols:

1-Auger drill rod; 2-Down-the-hole impactor; 3-Expanding drill bit; 4-Steel pipe; 5-Reducing connector; 6-Pipe shoe; 3-1-Chute; 3-2-Sliding block; 3 -3-Balls; 3-4-Rivets; 3-5-First annular step; 3-6-Air inlet hole; 3-7-First air outlet hole; 3-8-Slag discharge groove; 3-9- The air outlet of the first air outlet; 3-10-the second air outlet; 3-11-the air outlet of the second air outlet; 6-1-the second annular step.

Detailed ways

The present utility model will be described in further detail below with reference to specific embodiments, but the implementation of the present utility model is not limited thereto.

In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of To facilitate the description of the present invention and to simplify the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

Please refer to Figures 1 to 4. The embodiment of the present utility model provides a hard rock formation pipe curtain and pipe construction device, which specifically includes an auger drill rod 1, a down-the-hole impactor 2 and a reaming drill bit 3. The auger drill rod 1. The down-the-hole impactor 2 is connected end-to-end and installed in the steel pipe 4 of the pipe curtain construction, and the auger drill rod 1 and the down-the-hole impactor 2 are connected through a reducing connector 5.

Specifically, the front end surface of the reaming drill bit 3 is evenly distributed with four backward inclined chute 3-1, and the slider 3-2 is installed in the chute 3-1, and the slider 3-2 is installed in the chute 3-1. 2 can slide freely along the chute 3-1. When the slider 3-2 slides backward along the chute 3-1, the working surface of the reaming drill bit 3 gradually becomes larger. When the reaming drill bit 3 is in working condition, The slider 3-2 slides to the rearmost end of the chute 3-1, and the working surface of the reamer bit 3 is the largest. At this time, the rear end of the reamer bit 3 without the slider 3-2 is the same as the one with the slider 3-2. There is a gap between the front ends of the reaming drill bit 3, which can accommodate the steel pipe 4; in addition, in order to ensure that the slider 3-2 slides smoothly, a ball 3 is provided between the slider 3-2 and the slide groove 3-1 -3, and the rivets 3-4 are used to prevent the ball 3-3 from falling off the slider 3-2. When the drilling rig drives the reaming drill bit 3 to rotate, the slider 3-2 is forced to expand outward along the chute 3-1. , when the reaming bit 3 stops working, the drilling rig drives the reaming bit 3 to withdraw outward, and the slider 3-2 slides inward under the force, and smoothly withdraws from the steel pipe 4. There is no need to set a receiving well at the other end of the pipe curtain, thus Improved work efficiency and saved economic costs.

At the same time, a first annular step 3-5 is provided on the outer circumference of the front end of the reaming drill bit 3, and the first annular step 3-5 is located behind the slider 3-2; at the front end of the steel pipe 4 A pipe shoe 6 is welded, and a second annular step 6-1 is provided on the inner circumferential surface of the pipe shoe 6. The front end of the reaming drill bit 3 is arranged in the pipe shoe 6 and causes the slider 3- 2 extends out of the pipe shoe 6, the rear end of the reaming drill bit 3 is connected to the front end of the down-the-hole impactor 2, and the first annular step 3-5 offsets the second annular step 6-1 connection, so that when the reaming drill bit 3 moves forward, through the cooperation of the first annular step 3-5 and the second annular step 6-1, the steel pipe 4 can be driven to move forward at the same time, providing timely support for the hole wall of the drilled hole. The protective wall function ensures construction safety and avoids the local collapse of the hard rock strata mentioned in the background technology, resulting in hole collapse, making it impossible for the steel pipe 4 to enter the hole smoothly; because the second annular step 6-1 and the first annular step 3- 5. The contact point needs to withstand a large impact. Therefore, the pipe shoe 6 is made of high-strength and high-wear-resistant 27SiMn material.

In addition, the rear end of the reaming drill bit 3 is provided with air inlets 3-6 in the axial direction, and the front end of the reaming drill bit 3 is provided with four first air outlets 3-7 inclined outward. An air outlet hole 3-7 is connected with the air inlet hole 3-6; a slag discharge groove 3-8 is axially provided on the outer peripheral surface of the reaming drill bit 3 between the adjacent slide blocks 3-2, and The air outlet 3-9 of the first air outlet is located on the front end surface of the reaming drill bit 3 between the adjacent slide blocks 3-2 and corresponds to the slag discharge slot 3-8. Under the action of the press, high-pressure air enters through the internal channels of the auger drill pipe 1, reducing connector 5, and down-the-hole impactor 2, and then is discharged through the reaming drill bit 3. The broken rock slag is discharged from the drill pipe under the action of high-pressure wind. The slag discharge groove 3-8 on the reaming drill bit 3 is blown to the gap between the auger drill rod 1 and the steel pipe 4, and then high-pressure air is used to discharge the rock slag to the outside of the steel pipe 4 through the rotation of the auger drill rod 1, thereby solving the problem. This solves the problem of using high-pressure air to remove slag alone during the construction of pipe curtains with diameters greater than 200mm. When the rock slag is too large, it accumulates in the steel pipe, causing the drill to get stuck and unable to drill smoothly.

Further, in order to prevent the sliding block 3-2 of the reaming drill bit 3 from blocking the gap between the sliding block 3-2 and the chute 3-1 when the drilling slag and rock powder are working, causing the sliding block 3-2 to get stuck, A second air outlet hole 3-10 is provided at the front end of the reaming drill bit 3. The second air outlet hole 3-10 is connected with the air inlet hole 3-6, and the outlet of the second air outlet hole 3-10 is connected with the air inlet hole 3-6. The air outlet 3-11 is located in the chute 3-1, and the high-pressure air enters the second air outlet 3-10 to promptly blow out the remaining drilling slag and rock powder between the slider 3-2 and the chute 3-1. , so that the slider 3-2 can slide normally along the chute 3-1.

The process of using this utility model to carry out pipe curtain and pipe construction is as follows:

Set up the initial working chamber of the pipe curtain in the section where the pipe curtain advance support is to be installed. Set up the construction bench and the pipe curtain drilling rig in the initial working cavity. The pipe curtain drilling rig is connected in sequence to the auger drill pipe 1, the reducing connector 5, and the down-the-hole impactor. 2 and the reaming drill bit 3, and the above-mentioned drilling tools all pass through the first section of the steel pipe 4. After the reaming drill bit 3 contacts the rock mass, the slider 3-2 opens under the action of thrust, and the reaming drill bit 3 rotates to cut the rock. At the same time, the down-the-hole impactor 2 impacts and breaks the rock mass. Under the action of high-pressure wind, the broken rock slag is discharged from the slag discharge groove 3-8 of the reaming drill bit 3 into the gap between the auger drill pipe 1 and the steel pipe 4. , and then the rock slag is discharged to the outside of the steel pipe 4 through the rotation of the auger drill pipe 1. While cutting the broken rock mass to form a hole, the first steel pipe 4 enters the hole with the drill bit at the same time; when the construction reaches the design depth, the construction is stopped, and The auger drill rod 1, the down-the-hole impactor 2, and the reaming drill bit 3 are dragged out of the steel pipe 4 through the pipe curtain drilling rig, and when the reaming drill bit 3 is dragged out, the slider 3-2 is forced to slide inward, causing the It exits from the steel pipe 4 smoothly.

The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be concluded that the specific implementation of the present utility model is limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, some simple deductions or substitutions can be made without departing from the concept of the present utility model, which should be regarded as belonging to the protection scope of the present utility model.

Claims (6)

1. A hard rock formation pipe curtain and pipe construction device, characterized in that it includes an auger drill rod, a down-the-hole impactor and a reaming drill bit, and the auger drill rod and the down-the-hole impactor are connected end-to-end and installed in the steel pipe; The front end surface of the reaming drill bit is radially slidably connected to a plurality of slide blocks, and a first annular step is provided on the outer circumference of the front end of the reaming drill bit, and the first annular step is located behind the slide block; The front end of the steel pipe is fixedly connected to a pipe shoe, and a second annular step is provided on the inner circle of the pipe shoe. The front end of the reaming drill bit is arranged in the pipe shoe and causes the slider to extend out of the pipe. Outside the shoe, the rear end of the reaming drill bit is connected to the front end of the down-the-hole impactor, and the first annular step abuts the second annular step, so that when the reaming drill bit moves forward, the steel pipe is driven toward Move forward. 2. The hard rock formation pipe curtain and pipe construction device according to claim 1, characterized in that the front end surface of the reaming drill bit is evenly distributed with a number of backward inclined slide grooves in the radial direction, and the slide block is clamped. In the chute and can slide freely along the chute. 3. The hard rock formation pipe curtain and pipe construction device according to claim 2, characterized in that the rear end of the reaming drill bit is axially provided with an air inlet, and the front end of the reaming drill bit is inclined outwards. There is a first air outlet hole, and the first air outlet hole is connected with the air inlet hole; a slag discharge groove is axially provided on the outer circumferential surface of the reaming drill bit between the adjacent slide blocks, and the first air outlet hole is connected with the air inlet hole. The air outlet of the air outlet is located on the front end surface of the reaming drill bit between adjacent slide blocks and corresponds to the slag discharge groove. 4. The hard rock formation pipe curtain and pipe construction device according to claim 3, characterized in that the front end of the reaming drill bit is provided with a second air outlet, and the second air outlet and the air inlet are are connected, and the air outlet of the second air outlet is located in the chute. 5. The hard rock formation pipe curtain and pipe construction device according to claim 1, characterized in that a ball is provided between the slide block and the chute. 6. The hard rock formation pipe curtain and pipe construction device according to claim 1, characterized in that the auger drill rod and the down-the-hole impactor are connected through a variable diameter connector.