CN110500060A - A rapid grouting device, system and grouting method for staged advancing drill pipe - Google Patents

Abstract

The invention discloses a rapid grouting device for section-advancing drill pipes, which comprises: a plurality of double-tube drill pipes, each double-tube drill pipe is a concentric double-layer pipe structure, and an annular shape is formed between the outer pipe and the inner pipe. The channel and the inner tube are hollow structures; each double-tube drill pipe is arranged axially in the grouting hole in sections and in sequence, and the front and rear are detachably connected and communicated in sequence. The drill bit is provided with a single through hole in the axial direction, and is connected with and communicated with the end of a double-tube drill rod at the front end. A plurality of hydraulic bladder infusion tubes, each hydraulic bladder infusion tube is a tube body with two ends open, which are juxtaposed and closely attached to the double-pipe drill pipe. The anti-slurry hydraulic bladder is a hollow elastic bladder, which is wrapped around the outer wall of the front section of the double-pipe drill pipe at the front end, and communicates with the infusion tube of the hydraulic bladder at the front end. When the grouting device is used for grouting, the fixed-point grouting can be quickly sealed at any time without withdrawing from the drill pipe, and then the seal can be removed to continue drilling forward to realize the segmented forward grouting.

Description

A rapid grouting device, system and grouting method for staged advancing drill pipe

【Technical field】

The invention belongs to the technical field of civil engineering tunnel construction, and in particular relates to a rapid grouting device, a system and a grouting method of a section-advancing drill pipe.

【Background technique】

In the construction of tunnels and underground projects, weak water-rich strata are often encountered, which are prone to water and mud inrush and large deformation at the excavation surface, which endangers the safety of tunnel construction. At present, the grouting method is often used to improve the properties of the surrounding rock, that is, the cementitious material is injected into the surrounding rock under a certain pressure and consolidated, filling the pores and compacting the soil, and achieving a good effect of reinforcement and water blocking.

At present, there are two main horizontal grouting methods: that is, segmental forward grouting and drill pipe segmental retreat grouting. Segmented forward grouting is suitable for poor formation conditions. During drilling, if a large amount of water and sand gushing occurs, or the hole collapses seriously and it is impossible to continue drilling, then withdraw the drill pipe for grouting. After improving the surrounding rock in this section, drill again For this hole, the drill hole shall be deepened section by section until the design drilling depth is reached, and the drill pipe and grouting shall be withdrawn for the last time to complete the design grouting task of the hole. The grouting effect of this method is better, but the workload of repeated drilling is large, the overall grouting volume is large, the loss of grouting materials is large, and the construction period is long.

【Content of invention】

The purpose of the present invention is to provide a rapid grouting device, system and grouting method for drill pipes advancing in sections. When grouting, the fixed-point grouting can be quickly sealed at any time without withdrawing from the drill pipe, and then the seal can be canceled to continue Drilling forward to realize segmented forward grouting.

The present invention adopts the following technical solutions: a rapid grouting device for segmented advancing drill pipes, comprising:

A plurality of double-tube drill pipes, each of which is a concentric double-layer pipe structure, the inner pipe is a hollow structure, and an annular channel is formed between the outer pipe and the inner pipe; each of the double-pipe drill pipes Axially drill into the grouting hole sequentially, and each root can be detachably connected; the double-tube drill pipe at the rear end is used to connect the external grout or high-pressure water and air supply system; define the inside of the hole as the front, and the outside as the rear .

The drill bit has a single through hole in the axial direction, which is connected to and communicated with the end of the double-tube drill pipe at the front end;

A plurality of hydraulic bladder infusion tubes, the length of each hydraulic bladder infusion tube is consistent with the length of a double-pipe drill pipe; it is used to be arranged in the grouting hole in the axial direction in sequence, and the front and rear are detachably connected and connected in sequence, and It fits tightly with the double-pipe drill pipe; the hydraulic bladder infusion tube at the rearmost end is used to connect with the electric hydraulic pump pipeline;

The anti-slurry hydraulic bladder is a hollow elastic bladder, which covers the outer wall of the front section of the double-pipe drill pipe at the forefront, and is connected and communicated with the hydraulic bladder infusion tube at the forefront; when the bladder is filled with When entering the liquid, it fits closely with the side wall of the borehole and forms a sealing area at the front of the borehole.

Further, the front end of the anti-slurry hydraulic bag is in close contact with the rear end of the drill bit.

Further, when the slurry-stop hydraulic bladder is in a contracted state, its length is not less than 2m, and its width is at least 2cm smaller than the widest point of the drill bit.

Further, a semicircular groove is provided in the axial direction on the outer wall of each of the double-tube drill rods, which is used to hold the hydraulic bladder infusion tube; the inner diameter of each groove is the same as that of the hydraulic bladder infusion tube. The diameter of the tube is the same.

Further, the adjacent double-pipe drill rods and adjacent hydraulic bladder infusion tubes are all connected by quick joints.

Further, a rubber sleeve is provided at the quick joints between the adjacent double-tube drill rods and the adjacent hydraulic bladder infusion tubes.

Further, a single tube is integrally connected between the double-tube drill rod and the drill bit at the bottom of the hole.

The present invention also discloses a rapid grouting system for segmented advancing drill pipes, which includes the above-mentioned rapid grouting device for segmented advancing drill pipes, and further includes:

High-pressure water and air supply system, when drilling, the high-pressure water supply system is connected to the outer pipe pipeline of a double-pipe drill pipe at the rear end; the high-pressure air supply system is connected to the inner pipe pipeline;

The slurry machine is connected with the inner tube and the outer tube of the double-tube drill pipe at the rearmost end when injecting double slurry;

The electric hydraulic pump is detachably connected with the hydraulic bladder infusion line at the rearmost end, and is used to fill the hydraulic bladder with liquid.

The present invention also discloses a rapid grouting method for a section-advance drill pipe, using the above-mentioned section-advance type drill pipe rapid grouting device, the grouting method is as follows:

Step 1. Connect the high-pressure water and air supply system to the first double-tube drill pipe pipeline, start the machine, and drill at the set position;

Step 2. After drilling to the depth of the double-tube drill pipe, take another double-tube drill pipe and hydraulic bladder infusion tube to connect with the double-tube drill pipe and hydraulic bladder infusion tube in the hole, and continue Drill until the depth of the double-tube drill pipe, and then continue to connect each of the double-tube drill pipes in sequence; when the drilling reaches the design depth, stop drilling and directly perform step 4; when the drilling process In case of water gushing and mud bursting or hole collapse, perform step 3;

Step 3. Withdraw the double-pipe drill pipes connected together by 20-30 cm toward the orifice side, connect the electric hydraulic pump to the inlet pipeline of the hydraulic bladder infusion tube near the orifice, start it, and pass the liquid through the A plurality of hydraulic bladder infusion tubes are input into the grouting hydraulic bladder until its volume expands and sticks to the side wall of the borehole. After expansion, the grouting hydraulic bladder forms a sealing area with the space at the front end of the borehole until the pressure is at least the designed grouting pressure. 1.5 times the pressure, stop filling;

Step 4. Remove the high-pressure water and air supply system, connect the grouting machine to the inlet pipeline of the double-tube drill pipe near the orifice, and start it, so that the slurry passes through multiple double-tube drill pipes and drill bits in turn, and injects the sealant area until the grout solidifies; then discharge the liquid in the grout-stop hydraulic bladder to restore it to a contracted state;

Step 5. Repeat steps 1 to 4 until the hole is drilled to the designed depth.

The beneficial effects of the present invention are:

1. It realizes one-time sweeping to the design depth, avoids the work of repeated drilling and multiple withdrawal of drill pipes, greatly reduces the workload and improves the grouting construction speed.

2. Direct grouting with drill pipe simplifies the connection between drilling work and grouting work, and the construction speed is faster.

3. A grout-stop closed area is formed at the drill bit, the grout diffusion area is small, the pertinence and accuracy of local grouting are high, the effect of local grouting is more guaranteed, and the loss of grout is indirectly reduced.

【Description of drawings】

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural view of the construction state of the embodiment of the present invention.

Fig. 3 is an enlarged cross-sectional view of a double-tube drill pipe.

Among them: 1. Slurry stop hydraulic bladder, 2. Hydraulic bladder infusion tube, 3. Rubber sleeve, 4. Quick connector, 5. Electric hydraulic pump, 6. Pressure gauge, 10. Drill bit, 11. Double tube drill pipe.

【Detailed ways】

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

The embodiment of the present invention discloses a section-advancing drill pipe rapid grouting device, as shown in Figures 1, 2 and 3, comprising: a plurality of double-tube drill pipes 11, each double-tube drill pipe 11 is a concentric double Layer tube structure, both ends are open, the inner tube is a hollow structure, and an annular channel is formed between the outer tube and the inner tube; each double tube drill pipe 11 is used to be axially arranged in the grouting hole in sections Inside, front and rear are detachably connected and communicated in sequence, and a double-pipe drill pipe 11 at the rear end is used to connect to an external slurry or high-pressure water and air supply system; the inside of the borehole is defined as the front, and the outside is the back. The inner tube and the outer tube can be connected by partitions arranged at intervals. For the safety of grouting, a one-way valve can be installed at the front end of the annular passage and the inner pipe. In order to inject the slurry into the borehole, a drill bit 10 is provided, and a single through hole is provided in the axial direction, which is connected to and communicated with the end of a double-tube drill rod 11 at the front end in the hole.

A plurality of hydraulic bladder infusion tubes 2, the length of each hydraulic bladder infusion tube 2 is consistent with a double-pipe drill pipe 11; it is used to be arranged axially in the grouting hole in sequence in sections, and the front and back are detachably connected and connected in sequence and is closely attached to the double-pipe drill pipe 11; the hydraulic bladder infusion tube 2 at the rearmost end is used to connect with the electric hydraulic pump 5 pipeline; The outer wall of the front section of the double-pipe drill pipe 11 at the front end is connected and communicated with the frontmost hydraulic bladder infusion tube 2; when the bladder is filled with liquid, it is closely attached to the side wall of the borehole, The front part forms a sealing area. The front end is closely attached to the rear end of the drill bit 10; when the capsule is filled with liquid, the capsule expands radially along the borehole; it is closely attached to the side wall of the borehole, forming a sealing area at the front of the borehole. When the fluid is released, the sac returns to its contracted state. When the slurry-stop hydraulic bag 1 is in a contracted state, the length of the slurry-stop hydraulic bag 1 is not less than 2m, and its width is at least 2cm smaller than the widest point of the drill bit 10 . In order to facilitate the hole sweeping process, the slag can be smoothly discharged from the hole wall gap; after the volume expansion of the grout stop hydraulic bag 1, it is close to the drill bit 10 to form a grout stop zone with the front end of the drill hole to prevent the grout from forming a solid in the hole wall gap. It will affect the continuous drilling and slag discharge; the length of the grout stop hydraulic bag 1 is greater than 2m, so as to have sufficient grout stop and sealing ability after expansion.

On the outer wall of each double-pipe drill rod 11, there is a semicircular groove along the axial direction for clamping the hydraulic bladder infusion tube 2; the inner diameter of each groove is consistent with the diameter of the hydraulic bladder infusion tube 2.

The adjacent double-pipe drill rods 11 and the adjacent hydraulic bladder infusion tubes 2 are all connected by quick joints. There are many specifications of quick connectors, and the quick connectors suitable for pipe connection can be selected, all of which are existing finished products.

Each adjacent double pipe drill pipe 11 and the quick joint between the adjacent hydraulic bladder infusion tubes 2 are all sleeved with a rubber sleeve 3, and the rubber sleeve 3 is used to tighten and cover the joint.

The present invention also discloses a rapid grouting system for segmented advancing drill pipes, which includes the aforementioned rapid grouting device for segmented advancing drill pipes, and also includes: a high-pressure water and air supply system. The water supply system is connected to the outer pipe pipeline of a double-tube drill pipe 11 near the orifice; the high-pressure air supply system is connected to the inner pipe pipeline; The inner pipe and the outer pipe of a double-pipe drill pipe 11 are connected with pipelines; the electric hydraulic pump 5 is detachably connected with a hydraulic bladder infusion tube 2 pipeline near the orifice, which is used to fill the slurry hydraulic bladder 1 liquid. The high-pressure water, air supply system and slurry machine all adopt existing equipment, which are selected according to different construction conditions such as required pressure and speed.

The present invention also discloses a rapid grouting method for a section-advance type drill pipe. Using the above-mentioned section-advance type drill pipe rapid grouting device, the grouting method is as follows:

Step 1. Connect the high-pressure water and air supply system to the first double-tube drill pipe 11, start the machine, and drill at the set position;

Step 2, after drilling to the depth of the double-pipe drill pipe 11, another double-pipe drill pipe 11 and hydraulic bladder infusion tube 2 are connected to the double-pipe drill pipe 11 in the hole and the hydraulic bladder infusion tube 2, Continue drilling until the depth of the double-pipe drilling rod 11, and then continue to connect each double-pipe drilling rod 11 in sequence; when the drilling reaches the design depth, stop drilling and directly perform step 4; when the drilling process When there is water gushing and mud bursting or hole collapse, perform step 3;

Step 3. Withdraw the connected double pipe drill pipe 11 towards the orifice side by 20-30cm, connect the electric hydraulic pump 5 to the inlet pipeline of the hydraulic bladder infusion tube 2 near the orifice, start it, and pass the liquid through multiple tubes in sequence. The root hydraulic bladder infusion tube 2 is fed into the grouting hydraulic bladder 1 until its volume expands and sticks to the side wall of the borehole. The expanded grouting hydraulic bladder 1 forms a sealed area with the space at the front end of the borehole until the pressure is at least equal to the designed grouting pressure. 1.5 times, stop filling;

Step 4. Remove the high-pressure water and air supply system, connect the grouting machine to the inlet pipeline of the double-tube drill pipe 11 near the hole, and start it, so that the slurry passes through multiple double-tube drill pipes 11 and drill bits 10 in sequence, and injects into the sealing area , until the slurry is solidified; then discharge the liquid in the slurry-stop hydraulic bag 1 to restore it to the contracted state;

Step 5. Repeat steps 1 to 4 until the hole is drilled to the designed depth.

The specific construction is as follows:

Preparation for drilling:

Embed a hydraulic bladder infusion tube 2 into a semicircular groove on the outer wall of a double-tube drill pipe 11, and tighten it with a rubber sleeve 3. At this time, the hydraulic bladder infusion tube 2 and the electric hydraulic pump 5 are in a disconnected state. The hydraulic bladder infusion tube 2 and the double-tube drill pipe 11 can rotate synchronously; the inner and outer pipes of the double-tube drill pipe 11 are respectively connected with high-pressure air and water;

Drilling work:

Open the high-pressure air and water, start the drilling rig and start drilling, and after drilling into a double-pipe drilling rod 11, extend a new double-pipe drilling rod 11; Utilize quick connector 4 to connect a new hydraulic bag infusion tube 2 simultaneously, put the new A hydraulic bladder infusion tube 2 is embedded in a semicircular groove on the outer wall of a new double-tube drill rod 11, and a rubber sleeve 3 is added to tighten it; similarly, the drill rod and infusion tube are continuously extended to increase the drilling depth .

Grouting preparation:

If the drilling reaches the section length designed by the grouting scheme, stop the machine directly; if the drilling suddenly encounters unfavorable geological conditions, such as water gushing mud or hole collapse, etc., retreat the drill pipe 2m and stop the machine;

Connect the hydraulic bladder infusion tube 2 with the electric hydraulic pump 5 through the quick connector 4, start the electric hydraulic pump 5, and inject liquid into the slurry hydraulic bladder 1 through the hydraulic bladder infusion tube 2 to expand its volume until the reading of the pressure gauge 6 Reach 1.5 times of the designed grouting pressure, form a good sealing grouting body, and form a sealing area with the front end of the drill hole; remove the high-pressure air and water connected to the double pipe drill pipe 11, and connect it to the grouting machine.

Grouting operation:

Inject quick-setting grout into the sealing area through the grouting machine, such as polyurethane or cement-water glass double liquid grout. After the grouting work in this section is completed and the grout is solidified, the liquid in the grout-stop hydraulic bag 1 is discharged to restore it. contracted state.

Repeat the above operations to proceed in stages for drilling and grouting operations until the designed drilling depth is reached, and the design grouting requirements for this hole are completed.

Claims (8)

1. a kind of quick grouting device of segmentation protrusive drilling rod characterized by comprising

More dual pipe drilling rods (11), each dual pipe drilling rod (11) are concentric two-layer pipe, and inner tube is hollow Structure forms circular passage between outer tube and inner tube；Each dual pipe drilling rod (11) is sequentially axial to be pierced in injected hole, It is detachably connected between each；The dual pipe drilling rod (11) of one of rearmost end is for connecting external slurries or high pressure water and wind Feed system；Before being in definition drilling, after being outside；

Drill bit (10), axially offers single-pass hole, is connected with the end of the dual pipe drilling rod (11) of front end, and even It is logical；

Multiple hydraulic bag perfusion tubes (2), the length phase one of each the hydraulic bag perfusion tube (2) and a dual pipe drilling rod (11) It causes；It is sequentially axially set in injected hole for being segmented, front and back is sequentially detachably connected and is connected, and bores with the dual pipe Bar (11) fits closely；The hydraulic bag perfusion tube (2) of rearmost end is used for and electric hydraulic pump (5) piping connection；

Hydraulic bag (1) only is starched, is a hollow resilient bladder body, is coated on the leading portion of the dual pipe drilling rod (11) of front end It outer wall one week, connect and is connected with the hydraulic bag perfusion tube (2) of front end；When being filled with liquid in cystidium, only Slurry hydraulic bag (1) is radially expanded along drilling, is fitted closely with borehole sidewall, forms seal area in the front of drilling.

2. a kind of quick grouting device of segmentation protrusive drilling rod according to claim 1, which is characterized in that the only slurries The front end and the rear end of the drill bit (10) for pressing capsule (1) fit closely, when it is described only starch hydraulic bag (1) and be in contraction state when, Its length is not less than 2m, and width is less than the widest part at least 2cm of the drill bit (10).

3. a kind of quick grouting device of segmentation protrusive drilling rod according to claim 2, which is characterized in that each described double A semi-circular recesses are provided in the axial direction on the outer wall of pipe drilling rod (11) again, for hydraulic bag perfusion tube (2) described in clamping；Each institute The internal diameter for stating groove is consistent with the diameter of the hydraulic bag perfusion tube (2).

4. a kind of quick grouting device of segmentation protrusive drilling rod according to claim 3, which is characterized in that each adjacent institute It states and is connected by quick coupling between dual pipe drilling rod (11), adjacent hydraulic bag perfusion tube (2).

5. a kind of quick grouting device of segmentation protrusive drilling rod according to claim 4, which is characterized in that each adjacent institute It states and is arranged with a rubber sleeve (3) at the quick coupling between dual pipe drilling rod (11), adjacent hydraulic bag perfusion tube (2).

6. a kind of quick grouting device of segmentation protrusive drilling rod according to claim 5, which is characterized in that the one of bottom hole A single tube is integrally communicated between dual pipe drilling rod (11) and drill bit (10) described in root.

7. a kind of quick grouting system of segmentation protrusive drilling rod, which is characterized in that including of any of claims 1-6 A kind of quick grouting device of segmentation protrusive drilling rod, further includes:

High pressure water and wind feed system, when drilling, one of the high pressure water supply system and rearmost end is described dual The outer tube piping connection of pipe drilling rod (11)；The high-pressure blast feed system and inner tube piping connection；

Slurries machine, the inner and outer tubes piping connection when infusing double slurries, with the rearmost end one dual pipe drilling rod (11)；

Electric hydraulic pump (5) is detachably connected with hydraulic bag perfusion tube (2) pipeline of rearmost end, is used for described Only liquid is filled in slurry hydraulic bag (1).

8. the quick grouting method of a kind of segmentation protrusive drilling rod, before a kind of segmentation of any of claims 1-6 Into the quick grouting device of formula drilling rod, which is characterized in that the grouting method is as follows:

Step 1: by high pressure water and wind feed system and first dual pipe drilling rod (11) piping connection, starting favourable turn, In Position is arranged to drill；

Step 2: drilling is to after the depth of the root dual pipe drilling rod (11), separately taking dual pipe drilling rod (11) and hydraulic Capsule perfusion tube (2) in hole the dual pipe drilling rod (11) and hydraulic bag perfusion tube (2) be connected, continue to drill, until should The depth of root dual pipe drilling rod (11) then successively continues to be sequentially connected with each dual pipe drilling rod (11)；When drilling is to setting After counting depth, stop drilling, directly execution step 4；When occurring the prominent mud of water burst or collapse hole in boring procedure, step 3 is executed；

Step 3: the dual pipe drilling rod (11) to link together is exited 20-30cm towards aperture side, by electric hydraulic pump (5) it is connect with the entrance pipe of the hydraulic bag perfusion tube (2) close to aperture, starts, liquid is passed sequentially through described in more Hydraulic bag perfusion tube (2) input only starches hydraulic bag (1), until its volume expansion is affixed on borehole sidewall, the only slurries after expansion It presses capsule (1) and drilling front end space to form seal area, until pressure at least designs 1.5 times of grouting pressure, stops filling liquid；

Step 4: remove high pressure water and wind feed system, by entering for slip casting machine and dual pipe drilling rod (11) in close aperture Mouth piping connection, starting make slurries pass sequentially through the more dual pipe drilling rods (11) and drill bit (10), inject seal area, directly To grout cures；The liquid being then discharged out in only slurry hydraulic bag (1), makes it restore to contraction state；

Step 5: step 1~step 4 is repeated, until drilling to projected depth.