Rotary jet grouting drilling equipment and drilling method for pebble bed

Abstract

The invention discloses pebble bed jet grouting drilling equipment and a drilling method, and belongs to the technical field of stratum drilling, the drilling equipment comprises a hollow drilling cylinder, the drilling cylinder comprises a drill bit and a cylinder body fixedly connected with the drill bit, and the outer diameter of the cylinder body is smaller than that of the drill bit; a plurality of grouting rods are fixedly arranged on the outer wall of the barrel in the circumferential direction with the axis of the barrel as the center, a plurality of grouting holes are formed in the grouting rods side by side in the axis direction of the barrel, the outer diameter of the circumference formed by the grouting rods is smaller than that of the drill bit, a sliding groove is formed between every two adjacent grouting rods, and sliding rods capable of sliding in the radial direction of the barrel are slidably connected into the sliding grooves in a limited mode. When the sliding rod slides to the side away from the barrel, the outer wall of the sliding rod and the outer wall of the drill bit are located on the same arc face. In the rotating process of the drilling barrel, slurry can be smeared along the inner wall of a hole through the sliding rod; and after the concrete is initially set, the sliding rod slides in the direction close to the axis of the cylinder body, so that the sliding rod is separated from the inner wall of the hole, and the drill cylinder is conveniently taken out.

Description

Technical Field

[0001] The invention belongs to the technical field of stratum drilling, and in particular relates to a pebble layer rotary jet drilling device and a drilling method. Background Art

[0002] Cast-in-place pile foundations are a ground treatment technology that involves drilling holes into the ground and pouring concrete to create pile foundations, enhancing the foundation's bearing capacity and stability. This technology is widely used in construction projects, particularly in infrastructure projects requiring heavy loads or under complex geological conditions. However, when this technology is employed in gravel-based terrain, the pores are large and loose. Due to a lack of cohesion, the pore walls of the gravel layers are prone to deformation or collapse during or after drilling. Furthermore, during the application of mixed concrete after drilling, the instability of the pore walls can lead to concrete sloughing or uneven distribution, compromising subsequent construction quality.

[0003] In the prior art, for example, a drilling device for pebble formations disclosed in publication number CN119244159B flows quick-drying concrete along a flow groove in the drill barrel between the borehole and the drill barrel. The rotation of the drill barrel squeezes the concrete into the pebble layer to prevent the pebble layer from collapsing. However, after the quick-drying concrete solidifies, the drill barrel adheres to the inner wall of the borehole, i.e., the solidified concrete tightly surrounds the drill barrel, making it difficult to remove the drill barrel.

[0004] Therefore, it is necessary to propose a pebble layer rotary jet drilling equipment and a drilling method to solve the above problems. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a pebble layer rotary jet drilling equipment and drilling method, which is used to solve the problem in the prior art that the drill barrel is difficult to remove because the concrete is immersed in the pebble layer by rotating the drill barrel.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: The present invention provides a pebble layer rotary jet drilling device, comprising a hollow drill barrel, the drill barrel comprising a drill bit and a barrel fixedly connected to the drill bit, the outer diameter of the barrel being smaller than the outer diameter of the drill bit, a plurality of grouting rods being fixedly arranged circumferentially with the barrel axis as the center on the outer wall of the barrel, a plurality of grouting holes being arranged side by side on the grouting rods along the barrel axis, the outer diameter of the circle formed by the plurality of grouting rods being smaller than the outer diameter of the drill bit, a slide groove being formed between two adjacent grouting rods, a sliding rod which can slide radially along the barrel body being limitedly slidably connected in the slide groove, and when the sliding rod slides to the side away from the barrel body, the outer wall of the sliding rod and the outer wall of the drill bit are located on the same arc surface.

[0007] The top wall of the cylinder body is provided with a sliding ring that can limit sliding along the axis direction of the cylinder, and the bottom wall of the sliding ring is fixedly provided with a second push rod that cooperates with the second inclined edges of the multiple slide rods one by one. Pushing the sliding ring downward can cause the second push rod to squeeze the second inclined edge to make the slide rod slide in a direction away from the axis center of the cylinder.

[0008] Furthermore, a fixing sleeve is threadedly connected to the base, and the positioning sleeve is connected to the fixing sleeve for limited rotation.

[0009] Furthermore, a cavity corresponding to the grouting holes is provided in the grouting rod, a closing plate capable of closing the grouting holes is rotatably connected in the cavity, a gear corresponding to the cavity is rotatably connected to the outer wall of the grouting rod, one end of the gear is fixedly connected to a threaded rod, the threaded rod is threadedly connected to the grouting rod, and the threaded rod is coaxially fixedly connected to a fixing rod, the fixing rod extends into the cavity and is limitedly slidably connected to the closing plate, and a plurality of racks corresponding to the grouting rods are circumferentially arranged on the positioning sleeve with the axis of the positioning sleeve as the center, and the racks can engage with the gear.

[0010] Furthermore, limiting grooves are provided on the two opposite side walls of the slide groove, and a connecting rod that cooperates with the limiting groove is fixedly provided on the slide rod, and the connecting rod is limitedly slidably connected in the limiting groove. When the connecting rod slides to the limiting groove away from the axis of the cylinder, the outer wall of the slide rod and the outer wall of the drill bit are located on the same arc surface. When the connecting rod slides to the side of the limiting groove close to the axis of the cylinder, the circumferential diameter formed by the outer walls of the multiple slide rods is larger than the circumferential diameter formed by the multiple grouting rods, and the positioning sleeve is provided with a key groove that cooperates with the slide rod.

[0011] Furthermore, the drill bit is detachably fixed to the bottom end of the cylinder by bolts.

[0012] A drilling method for a pebble layer rotary jet drilling device comprises the following steps: S1: Fix the base to the pre-drilled hole, then fix the drill bit and the barrel with bolts to form a drill barrel, and put the positioning sleeve on the barrel near the drill bit, and turn the gear to close the grouting hole. S2: sliding the sliding ring downwards to make the second push rod extrude the second inclined side to make the slide rod slide in the direction away from the axis of the barrel, until the outer wall of the slide rod is located on the same arc surface with the outer wall of the drill bit, and then fixing the sliding ring; S3: drilling down through the drill barrel, wherein, during the drilling down of the drill barrel, the barrel drives the gear to move downwards, and the gear can rotate to drive the closing plate to rotate and open the grouting hole, and the concrete is injected into the grouting rod through the grouting device and sprayed out from the opened grouting hole; S4: after the drill barrel is drilled down to the designed depth, the drill barrel is continuously rotated for a preset time, and the grouting device continuously injects the concrete to spray out from the grouting hole within the preset time; S5: sliding the sliding ring upwards to make the second push rod disengage from the slide rod, then rotating the fixing sleeve to drive the positioning sleeve to slide downwards, so that the first push rod extrudes the first inclined side to make the slide rod slide in the direction close to the axis of the barrel, so that the plurality of slide rods are synchronously disengaged from the inner wall of the pebble layer hole, and then the drill barrel is taken out; wherein, during the taking out of the drill barrel, the gear rotating through the rack drives the closing plate to close the grouting hole.

[0013] The beneficial effects of the present application are: The present application is provided by the setting of the chute, the gap is provided between the adjacent slide rods, so that the concrete slurry can be sprayed from the grouting hole to the inner wall of the pebble layer hole through the gap, and the slurry can be "painted" along the inner wall of the hole through the slide rod during the rotation of the drill barrel; after the initial setting of the concrete, the slide rod is slid in the direction close to the axis of the barrel to disengage the slide rod from the inner wall of the hole, so as to facilitate the taking out of the drill barrel.

[0014] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, and it is intended to cover any alternatives, modifications, or equivalents included within the scope of the present application. The objects and other advantages of the present application can be achieved and obtained by the following specification. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the purposes, technical solutions and beneficial effects of the present application clearer, the present application provides the following drawings for illustration: Figure 1 It is a drilling profile view of the rotary spraying drilling device of the embodiment of the present application; Figure 2 It is a partial view of the rotary spraying drilling device of the embodiment of the present application; Figure 1 It is an enlarged view of the partial A; Figure 3 It is a barrel top view partial sectional view when the slide rod of the embodiment of the present application is slid to the side away from the axis of the barrel; Figure 4 It is a barrel top view partial sectional view when the slide rod of the embodiment of the present application is slid to the side close to the axis of the barrel; Figure 5 This is a schematic diagram of the installation of a closing plate according to an embodiment of the present invention.

[0016] The markings in the accompanying drawings are as follows: drill bit 1, cylinder 2, slide groove 201, sliding ring 202, second push rod 203, limit groove 204, grouting rod 3, grouting hole 301, cavity 302, closing plate 303, gear 304, threaded rod 305, fixed rod 306, slide rod 4, first inclined edge 401, second inclined edge 402, connecting rod 403, base 5, fixing sleeve 501, positioning sleeve 502, first push rod 503, rack 504. DETAILED DESCRIPTION

[0017] like Figures 1 to 5 As shown, the present invention provides a pebble layer rotary jet drilling equipment, comprising: a hollow drill barrel, the drill barrel comprising a drill bit 1 and a barrel 2 fixedly connected to the drill bit 1, the outer diameter of the barrel 2 is smaller than the outer diameter of the drill bit 1, and the outer wall of the barrel 2 is circumferentially fixed with a plurality of grouting rods 3 centered on the axis of the barrel 2, and a plurality of grouting holes 301 are arranged side by side on the grouting rods 3 along the axial direction of the barrel 2. The outer diameter of the circle formed by the plurality of grouting rods 3 is smaller than the outer diameter of the drill bit 1, and a slide groove 201 is formed between two adjacent grouting rods 3, and a slide rod 4 that can slide radially along the barrel 2 is limitedly slidably connected in the slide groove 201. When the slide rod 4 slides to the side away from the barrel 2, the outer wall of the slide rod 4 and the outer wall of the drill bit 1 are located on the same arc surface.

[0018] In this solution, when the drill barrel is drilled, the slide bar 4 is slid so that the outer wall of the slide bar 4 and the outer wall of the drill bit 1 are located on the same arc surface. After the drill barrel is drilled, the pebbles in the drill barrel are removed by other equipment to form a preliminary drilled hole. After drilling to the specified position, concrete is injected into the grouting rod 3 by the grouting equipment, and sprayed to the inner wall of the pebble layer hole through the grouting hole 301, and the drill barrel is rotated synchronously to make the inner wall of the hole evenly sprayed. Due to the setting of the slide groove 201, a gap is set between adjacent slide bars 4, so that the concrete slurry can be sprayed from the grouting hole 301 through the gap to the inner wall of the pebble layer hole. During the rotation of the drill barrel, the slurry can be "smeared" along the inner wall of the hole through the slide bar 4; after the concrete is initially set, the slide bar 4 is slid in the direction close to the axis of the cylinder body 2 to make the slide bar 4 separate from the inner wall of the hole, so as to facilitate the removal of the drill barrel.

[0019] In one embodiment of the present invention, the pebble layer rotary jet drilling device also includes a base 5 fixedly installed on the top surface of the pebble layer, a fixing sleeve 501 is threadedly connected to the base 5, a positioning sleeve 502 is rotatably connected inside the fixing sleeve 501, and the positioning sleeve 502 is slidably connected to the base 5, and the positioning sleeve 502 is slidably sleeved on the outer wall of the cylinder 2, and the top wall of the slide rod 4 is provided with a first inclined edge 401 inclined downward on the side away from the axis of the cylinder 2, and the top wall of the slide rod 4 is provided with a second inclined edge 402 inclined downward on the side close to the axis of the cylinder 2, and the bottom wall of the positioning sleeve 502 is fixedly provided with a second inclined edge 402 inclined downward with multiple slide rods 4. A first push rod 503 that matches one of the inclined edges 401 one by one, pushing the positioning sleeve 502 downward can cause the first push rod 503 to squeeze the first inclined edge 401 so that the slide rod 4 slides in the direction close to the axis of the cylinder 2, and a sliding ring 202 is slidingly provided on the top wall of the cylinder 2, and the sliding ring 202 can slide limitedly along the axial direction of the cylinder 2, and the bottom wall of the sliding ring 202 is fixedly provided with a second push rod 203 that matches one by one with the second inclined edges 402 of multiple slide rods 4, and pushing the sliding ring 202 downward can cause the second push rod 203 to squeeze the second inclined edge 402 so that the slide rod 4 slides in the direction away from the axis of the cylinder 2.

[0020] In this solution, the verticality of the drill barrel during the drilling process can be improved by setting the base 5 and the positioning sleeve 502. During the drilling process, the sliding ring 202 needs to be slid downward first to make the second push rod 203 squeeze the second inclined edge 402 to make the slide rod 4 slide in the direction away from the axis of the barrel 2 until the outer wall of the slide rod 4 and the outer wall of the drill bit 1 are located on the same arc surface, and then the sliding ring 202 is fixed; when removing the drill barrel, the sliding ring 202 needs to be slid upward first to make the second push rod 203 disengage from the slide rod 4, and then the fixing sleeve 501 is rotated to drive the positioning sleeve 502 to slide downward, so that the first push rod 503 squeezes the first inclined edge 401 to make the slide rod 4 slide in the direction close to the axis of the barrel 2, so that multiple slide rods 4 are synchronously separated from the inner wall of the pebble layer hole, and then the drill barrel is removed.

[0021] In this solution, the positioning sleeve 502 and the sliding ring 202 are provided to enable the multiple sliding rods 4 to slide synchronously.

[0022] In one embodiment of the present invention, a cavity 302 corresponding to the grouting hole 301 is provided in the grouting rod 3, and a closing plate 303 capable of closing the grouting hole 301 is rotatably connected in the cavity 302. The outer wall of the grouting rod 3 is rotatably connected to a gear 304 corresponding to the cavity 302. One end of the gear 304 is fixedly connected to a threaded rod 305, and the threaded rod 305 is threadedly connected to the grouting rod 3. The threaded rod 305 is coaxially fixedly connected to a fixing rod 306, and the fixing rod 306 extends into the cavity 302 and is limitedly slidably connected to the closing plate 303. A plurality of racks 504 corresponding to the grouting rod 3 are circumferentially arranged on the positioning sleeve 502 with the axis of the positioning sleeve 502 as the center, and the racks 504 can engage with the gear 304.

[0023] After the cylinder 2 is removed, the sliding rod 4 is first slid to the side close to the axis of the cylinder 2 through the sliding ring 202 and the positioning sleeve 502, and then the cylinder 2 is removed upward. At this time, the gear 304 passing through the rack 504 rotates, driving the closing plate 303 to close the grouting hole 301.

[0024] In one embodiment of the present invention, limiting grooves 204 are provided on opposite side walls of the slideway 201. Connecting rods 403 that cooperate with the limiting grooves 204 are fixedly provided on the slide bar 4. The connecting rods 403 are slidingly connected in the limiting grooves 204. When the connecting rods 403 slide to the limiting groove 204 away from the axis of the barrel 2, the outer wall of the slide bar 4 and the outer wall of the drill bit 1 are located on the same arc surface. When the connecting rods 403 slide to the limiting groove 204 close to the axis of the barrel 2, the circumferential diameter formed by the outer walls of the multiple slide bars 4 is larger than the circumferential diameter formed by the multiple grouting rods 3. The positioning sleeve 502 is provided with a keyway that cooperates with the slide bar 4. This prevents relative rotation between the barrel 2 and the positioning sleeve 502, thereby ensuring that the rack 504 and the gear 304 are in meshing state.

[0025] In one embodiment of the present invention, the drill bit 1 is detachably fixed to the bottom end of the barrel 2 by bolts.

[0026] A drilling method for a pebble layer rotary jet drilling device comprises the following steps: S1: Fix the base 5 to the pre-drilled hole, then fix the drill bit 1 and the barrel 2 with bolts to form a drill barrel, and put the positioning sleeve 502 on the barrel 2 near the drill bit 1, and rotate the gear 304 to close the grouting hole 301. S2: Slide the sliding ring 202 downward so that the second push rod 203 presses the second inclined edge 402 to slide the sliding rod 4 in a direction away from the axis of the barrel until the outer wall of the sliding rod 4 and the outer wall of the drill bit are located on the same arc surface, and then fix the sliding ring 202; S3: The drill barrel rotates to drill down. During the drilling process, the barrel body 2 drives the gear 304 to move downward. The gear 304 rotates via the rack 504 to drive the closing plate 303 to rotate and open the grouting hole 301. The concrete is injected into the grouting rod 3 through the grouting equipment and ejected from the opened grouting hole 301. S4: After the drill tube is drilled to the designed depth, the drill tube is rotated for a preset time. During the preset time, the grouting equipment continuously injects concrete and sprays it out from the grouting hole 301; S5: Slide the sliding ring 202 upward to disengage the second push rod 203 from the slide rod 4, and then rotate the fixing sleeve 501 to drive the positioning sleeve 502 to slide downward, so that the first push rod 503 squeezes the first inclined edge 401 to make the slide rod 4 slide in the direction close to the axis of the barrel 2, so that multiple slide rods 4 are synchronously disengaged from the inner wall of the pebble layer hole, and then the drill barrel is taken out; wherein, during the process of removing the drill barrel, the gear 304 passing through the rack 504 rotates, driving the closing plate 303 to close the grouting hole 301.

[0027] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A pebble layer jet jet drilling device, comprising a hollow drill barrel, characterized in that: The drill barrel includes a drill bit and a barrel fixedly connected to the drill bit, the outer diameter of the barrel being smaller than the outer diameter of the drill bit, and a plurality of grouting rods are fixedly arranged on the outer wall of the barrel in a circumferential direction with the barrel axis as the center, and a plurality of grouting holes are arranged side by side on the grouting rods along the barrel axis. The outer diameter of the circle formed by the plurality of grouting rods is smaller than the outer diameter of the drill bit, and a slide groove is formed between two adjacent grouting rods, and a sliding rod that can slide radially along the barrel is limitedly connected in the slide groove. When the sliding rod slides to the side away from the barrel, the outer wall of the sliding rod and the outer wall of the drill bit are located on the same arc surface.

2. The pebble layer rotary jet drilling equipment according to claim 1, characterized in that: The cam is fixedly provided with a first push rod on the top wall of the sliding rod and is engaged with the first and second inclined edges of the sliding rods, and the cam is connected with the second push rod on the bottom wall of the sliding rod to stop the sliding of the sliding rod.

3. The pebble layer rotary jet drilling equipment according to claim 2, characterized in that: A fixing sleeve is threadedly connected to the base, and the positioning sleeve is connected to the fixing sleeve for limited rotation.

4. The pebble layer rotary jet drilling equipment according to claim 3, characterized in that: A cavity corresponding to the grouting holes is provided in the grouting rod, and a closing plate capable of closing the grouting holes is rotatably connected in the cavity. A gear corresponding to the cavity is rotatably connected to the outer wall of the grouting rod. One end of the gear is fixedly connected to a threaded rod, and the threaded rod is threadedly connected to the grouting rod. A fixing rod is coaxially fixed to the threaded rod, and the fixing rod extends into the cavity and is limitedly slidably connected to the closing plate. A plurality of racks corresponding to the grouting rods are circumferentially arranged on the positioning sleeve with the axis of the positioning sleeve as the center, and the racks can mesh with the gear.

5. The pebble layer rotary jet drilling equipment according to claim 4, characterized in that: Limiting grooves are provided on the two opposite side walls of the slide groove, and a connecting rod that cooperates with the limiting groove is fixedly provided on the slide rod. The connecting rod is slidingly connected in the limiting groove. When the connecting rod slides to the limiting groove away from the axis of the cylinder, the outer wall of the slide rod and the outer wall of the drill bit are located on the same arc surface. When the connecting rod slides to the side where the limiting groove is close to the axis of the cylinder, the circumferential diameter formed by the outer walls of the multiple slide rods is larger than the circumferential diameter formed by the multiple grouting rods, and the positioning sleeve is provided with a key groove that cooperates with the slide rod.

6. The pebble layer rotary jet drilling equipment according to claim 1, characterized in that: The drill bit is detachably fixedly connected to the bottom end of the cylinder through bolts.

7. The drilling method of the pebble layer rotary jet drilling equipment according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Fix the base to the pre-drilled hole, then fix the drill bit and the barrel with bolts to form a drill barrel, and put the positioning sleeve on the barrel near the drill bit, and turn the gear to close the grouting hole. S2: Slide the sliding ring downward so that the second push rod presses the second inclined edge to slide the sliding rod in a direction away from the axis of the barrel until the outer wall of the sliding rod and the outer wall of the drill bit are located on the same arc surface, and then fix the sliding ring; S3: Drilling is performed by rotating the drill barrel. During the drilling process, the barrel drives the gear to move downward, which in turn drives the gear to rotate through the rack to drive the closing plate to rotate and open the grouting hole. The concrete is injected into the grouting rod through the grouting equipment and ejected from the opened grouting hole. S4: After the drill tube is drilled to the designed depth, the drill tube is rotated for a preset time. During the preset time, the grouting equipment continuously injects concrete and sprays it out from the grouting hole; S5: Slide the sliding ring upward to disengage the second push rod from the sliding rod, and then rotate the fixing sleeve to drive the positioning sleeve to slide downward, so that the first push rod squeezes the first inclined edge to make the sliding rod slide in the direction close to the axis of the barrel, so that multiple sliding rods are synchronously disengaged from the inner wall of the pebble layer hole, and then the drill barrel is removed; wherein, during the process of removing the drill barrel, the gear passing through the rack rotates, driving the closing plate to close the grouting hole.

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