Deep foundation pit supporting drilling device and method

Abstract

The application relates to a deep foundation pit supporting drilling device and method, which comprises a front baffle and a rear baffle, a reaming ring is arranged between the front baffle and the rear baffle, a driving displacement assembly is arranged on the reaming ring, a supporting anchor rod is slidably arranged in the reaming ring, the end of the supporting anchor rod close to the front baffle is in a pointed end structure, a guide inclined surface is arranged at the end of the reaming ring close to the front baffle, a cross groove is arranged at the center of the front baffle, four sealing sliding blocks are circumferentially and slidably connected in the cross groove, and an arc-shaped groove is arranged on the inner side of the sealing sliding block; the contact position of the extrusion pipe and the supporting anchor rod enters the pouring hole, and finally is discharged from the multiple discharge holes, so that the hole gap generated by the reaming ring when the reaming ring exits the hole is filled with the concrete mortar, the synchronous filling of the concrete mortar prevents the hole from collapsing, and the stability of the hole pouring is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit support, in particular to a deep foundation pit support drilling device and method. BACKGROUND

[0002] The patent document with publication number CN118148488B discloses a deep foundation pit support drilling mechanism and its assembly and disassembly method. The mechanism includes a drill sleeve and an anchor rod. The drill sleeve is a hollow cylindrical structure, and the anchor rod is transversely arranged inside the drill sleeve. The drill sleeve is provided with a helically extending cutting edge at one end, and a plug is detachably fixed to the end of the anchor rod away from the cutting edge. A steel cable is fixed to the outside of the plug and extends transversely into the drill sleeve. The ends of the steel cable extend outward along the cutting edge of the drill sleeve.

[0003] In the prior art, when the drill bit drills a hole, the hole wall is prone to instability, collapse or peeling, which not only causes the drill to be buried or stuck, but also causes the entire hole to be scrapped, resulting in huge economic losses and safety risks. After the drill bit is withdrawn from the hole, the hole wall is prone to collapse and soil peeling due to the lack of support from the drill bit, which reduces the quality of the drilled hole. SUMMARY

[0004] The present application aims to solve the problems in the prior art and provides a deep foundation pit support drilling device and method.

[0005] To achieve the above purpose, the technical solution adopted by the present application is as follows: a deep foundation pit support drilling device, comprising a front baffle and a rear baffle, a reaming ring is arranged between the front baffle and the rear baffle, a driving displacement assembly is arranged on the reaming ring, a support anchor rod is slidably inserted into the inside of the reaming ring, the end of the support anchor rod close to the front baffle is a pointed end structure, a guide inclined surface is formed at the end of the reaming ring close to the front baffle, a cross slot is formed at the center of the front baffle, four sealing sliding blocks are connected to the cross slot in a circumferential direction, arc-shaped grooves are formed on the inner side of the sealing sliding blocks, the four arc-shaped grooves form a complete circular profile and are in sliding fit with the surface of the support anchor rod, and the sealing sliding blocks are in contact with the guide inclined surface of the reaming ring.

[0006] A contact plate is fixedly connected to the side of the front baffle away from the rear baffle, a circular groove is formed at the center of the contact plate, the inner diameter of the circular groove is the same as the diameter of the reaming ring, and an elastic displacement assembly is arranged on each sealing sliding block.

[0007] The side of the back baffle away from the front baffle is provided with an extrusion pipe, one end of the extrusion pipe penetrates through the back baffle and is in contact with one end of the support anchor rod, the inside of the support anchor rod is provided with a pouring hole, the surface of the end of the support anchor rod close to the front baffle is provided with a plurality of discharge holes in the circumferential direction, the plurality of discharge holes are in communication with the pouring hole, a cooperation displacement assembly is arranged on the extrusion pipe, when the driving displacement assembly drives the reaming ring to move towards the front baffle, the cooperation displacement assembly drives the extrusion pipe to move synchronously with the reaming ring, when the reaming ring moves reversely, the extrusion pipe is in a static positioning state.

[0008] Preferably, the driving displacement assembly comprises a limiting ring, the limiting ring is fixedly connected to one end of the reaming ring close to the back baffle, a plurality of light rods are slidingly inserted on the reaming ring, the light rods are fixedly connected between the front baffle and the back baffle, a screw rod is rotatably connected between the front baffle and the back baffle, the limiting ring is threadedly connected to the screw rod, a motor is fixedly installed on the back baffle, and an output shaft of the motor is fixedly connected to one end of the screw rod.

[0009] Preferably, the cooperation displacement assembly comprises a fixed block, the fixed block is fixedly connected to one end of the extrusion pipe away from the reaming ring, two limiting pins are slidingly inserted on the fixed block, one end of the two limiting pins penetrates through the back baffle and is fixedly connected to the limiting ring, two mounting blocks are fixedly connected to the back baffle in the circumferential direction, the adjacent side of the two mounting blocks is provided with a wedge-shaped stopper, two first connecting pins are fixedly connected to the wedge-shaped stopper, the first connecting pins are slidingly inserted in the corresponding mounting blocks, a first spring is sleeved on the first connecting pin, and the first spring is fixedly connected between the corresponding wedge-shaped stopper and the mounting block.

[0010] Preferably, the elastic displacement assembly comprises two second connecting pins, the two second connecting pins are fixedly connected to the sealing sliding block, a connecting block is slidingly inserted on the second connecting pin, the connecting block is fixedly connected to the front baffle, a second spring is sleeved on the second connecting pin, and the second spring is fixedly connected between the sealing sliding block and the corresponding connecting block.

[0011] Preferably, four U-shaped rods are slidingly connected between the front baffle and the back baffle in the circumferential direction, one end of the U-shaped rod is fixedly connected to the corresponding sealing sliding block, the other end of the U-shaped rod is fixedly connected to a limiting insertion rod, and four insertion grooves are formed in the limiting ring in the circumferential direction.

[0012] Preferably, one of the sealing sliding blocks is provided with a mounting groove on the side close to the contact plate, and a pressure sensor is fixedly installed in the mounting groove.

[0013] Preferably, a circular groove is formed in the inside of the circular groove, an annular shell is fixedly connected in the annular groove, a plurality of drainage pipes are fixedly connected to the inside of the annular shell in the circumferential direction, an inlet pipe is fixedly connected to the outside of the annular shell, and one end of the inlet pipe penetrates through the contact plate and extends to the outside of the contact plate.

[0014] Preferably, one end of the drainage pipe is fixedly connected with a character-shaped nozzle.

[0015] Preferably, the contact plate is fixedly connected with a plurality of anti-skid rivets in a circumferential direction on the side away from the front baffle plate, and the plurality of anti-skid rivets are conical in structure.

[0016] A drilling method of a deep foundation pit support drilling device, the method comprising the following steps:

[0017] Step one, the contact plate is contacted and attached to the foundation pit revetment, and the driving displacement assembly is driven to move the reaming ring to the front baffle plate direction, the cooperating movement assembly is driven to move the extrusion pipe synchronously, and the extrusion pipe is contacted and extruded with the support anchor rod, so that the tip of the support anchor rod is moved into the soil body of the foundation pit revetment to drill a hole;

[0018] Step two, after the support anchor rod moves to a fixed depth in the revetment soil body, the driving displacement assembly drives the reaming ring to move reversely and return to the initial position, and the cooperating movement assembly is in a static positioning state, so that the support anchor rod is still located in the drilled hole, the concrete mortar conveying pipe is connected to the end of the extrusion pipe away from the front baffle plate, and the concrete mortar is conveyed along the inside of the extrusion pipe;

[0019] Step three, after the reaming ring returns to the initial position, the guide inclined surface at one end of the reaming ring moves to between the four sealing sliding blocks, then the four sealing sliding blocks are driven to move close to the center through the action of the elastic displacement assembly, and the arc-shaped groove is contacted and attached to the support anchor rod to block the opening of the drilled hole.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1. The arc-shaped groove is contacted and attached to the support anchor rod to block the opening of the drilled hole, so that the concrete mortar is prevented from overflowing during the pouring process, and after the concrete mortar is preliminarily solidified in the hole, the device is taken out and the support anchor rod is left in the poured hole, so that the drilling, rod setting and pouring work are completed at one time.

[0022] 2. When the fixed block passes between the two wedge-shaped blocks and is located between the rear baffle plate and the wedge-shaped block, the first spring is reset through the elastic stretching action and extrudes the wedge-shaped block to return to the initial position, so as to block the fixed block and limit the return of the fixed block, when the limiting ring drives the reaming ring to return, the limiting pin moves along the sliding insertion of the fixed block, and the fixed block is blocked by the wedge-shaped block, so that the extrusion pipe extrudes and limits the support anchor rod, so that the support anchor rod is always located in the hole and cannot return with the reaming ring.

[0023] 3. The sealing slider seals the circular groove at the center of the contact plate through the elastic action of the second spring. At this time, the limiting ring continues to drive the expanding ring to move, causing the limiting ring to continue moving towards the rear baffle. The movement of the limiting ring ensures that the limiting rods are inserted into the corresponding insertion grooves, thereby positioning the sealing slider and preventing it from moving due to the impact of the concrete mortar pouring pressure during the sealing process, thus ensuring the stability of the seal. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the first structure of the present invention;

[0025] Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the diagram;

[0026] Figure 3 For the present invention Figure 1 Enlarged schematic diagram of the structure at point B in the diagram;

[0027] Figure 4 This is a schematic diagram of the second structure of the present invention;

[0028] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point C;

[0029] Figure 6 For the present invention Figure 4 Enlarged schematic diagram of the structure at point D;

[0030] Figure 7 This is a cross-sectional structural diagram of the present invention;

[0031] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point E in the diagram;

[0032] Figure 9 For the present invention Figure 7 Enlarged schematic diagram of the structure at point F;

[0033] Figure 10 This is a schematic diagram of the first mating structure of the front baffle and the contact plate of the present invention;

[0034] Figure 11 This is a schematic diagram of the second mating structure of the front baffle and the contact plate of the present invention (the contact plate has been cut out).

[0035] Figure 12 For the present invention Figure 11 A magnified schematic diagram of the structure at point G in the diagram.

[0036] In the figure: 1, front baffle; 2, rear baffle; 3, hole expanding ring; 4, support anchor rod; 5, cross groove; 6, sealing sliding block; 7, arc-shaped groove; 8, contact plate; 9, circular groove; 10, extrusion pipe; 11, pouring hole; 12, discharge hole; 13, limiting ring; 14, polished rod; 15, screw rod; 16, motor; 17, fixed block; 18, limiting pin; 19, mounting block; 20, wedge-shaped stop block; 21, first connecting pin; 22, first spring; 23, second connecting pin; 24, connecting block; 25, second spring; 26, U-shaped rod; 27, limiting plug rod; 28, plug-in groove; 29, mounting groove; 30, pressure sensor; 31, annular groove; 32, annular shell; 33, liquid discharge pipe; 34, liquid inlet pipe; 35, linear-shaped nozzle; 36, anti-skid rivet. DETAILED DESCRIPTION

[0037] The following description is provided to enable those skilled in the art to implement the present application. The preferred embodiments in the following description are only examples of the present application, and other obvious modifications can be made by those skilled in the art.

[0038] As Figures 1 to 12 shown in a deep foundation pit support drilling device and method, comprising front baffle 1 and rear baffle 2, front baffle 1 and rear baffle 2 between the setting has hole expanding ring 3, hole expanding ring 3 on the setting has driven displacement assembly, hole expanding ring 3 inside sliding plug-in support anchor rod 4, support anchor rod 4 near the front baffle 1 one end for the tip structure, hole expanding ring 3 near the front baffle 1 one end is provided with guide slope, as Figure 10 and Figure 11 shown, the center of front baffle 1 is provided with cross groove 5, cross groove 5 in the circumferential direction sliding connection has four sealing sliding block 6, the inner side of sealing sliding block 6 is provided with arc-shaped groove 7, four arc-shaped groove 7 forms a complete circular profile and with the surface of support anchor rod 4 sliding fit, sealing sliding block 6 and hole expanding ring 3 guide slope contact fit;

[0039] Front baffle 1 away from the rear baffle 2 side fixedly connected with contact plate 8, the center of contact plate 8 is provided with circular groove 9, the inner diameter of circular groove 9 is same with the diameter of hole expanding ring 3, sealing sliding block 6 is provided with elastic accommodation assembly;

[0040] Rear baffle 2 away from the front baffle 1 side is provided with extrusion pipe 10, extrusion pipe 10 one end through the rear baffle 2 after with support anchor rod 4 one end contact (as Figure 8 shown), the inside of support anchor rod 4 is provided with pouring hole 11, the surface of support anchor rod 4 near the front baffle 1 one end is provided with multiple discharge hole 12 (as Figure 9As shown in the figure), a plurality of discharge holes 12 are connected with the pouring hole 11, and the extrusion pipe 10 is provided with a matching movement assembly. When the driving displacement assembly drives the reamer ring 3 to move towards the front baffle 1, the matching movement assembly drives the extrusion pipe 10 to move synchronously with the reamer ring 3. When the reamer ring 3 moves reversely, the extrusion pipe 10 is in a static positioning state;

[0041] The contact plate 8 is in contact with the foundation pit slope, and the driving displacement assembly drives the reamer ring 3 to move towards the front baffle 1. One end of the reamer ring 3 passes through the cross groove 5 and the circular groove 9 in turn and enters the soil of the foundation pit slope. Meanwhile, the extrusion pipe 10 is driven to move synchronously by the matching movement assembly, and the contact and extrusion between the extrusion pipe 10 and the supporting anchor rod 4 enable the tip of the supporting anchor rod 4 to move and drill a hole in the soil of the foundation pit slope. During the movement of the reamer ring 3, the guiding slope at one end of the reamer ring 3 is in contact and extrusion with the arc surface of the sealing sliding block 6, and the four sealing sliding blocks 6 are driven to move away from the reamer ring 3 by the guiding effect, thereby moving and giving way.

[0042] After the supporting anchor rod 4 moves to a fixed depth in the slope soil along with the reamer ring 3, the driving displacement assembly drives the reamer ring 3 to move reversely and return to the initial position. At this time, the extrusion pipe 10 is in a static positioning state by the action of the matching movement assembly, thereby extruding and positioning the supporting anchor rod 4 so that the supporting anchor rod 4 still stays in the drilled hole. The concrete mortar conveying pipe is connected at the end of the extrusion pipe 10 away from the front baffle 1. The concrete mortar is conveyed inside the extrusion pipe 10 and enters the pouring hole 11 through the contact position between the extrusion pipe 10 and the supporting anchor rod 4, and finally is discharged from the plurality of discharge holes 12. Thus, while the reamer ring 3 exits the hole, the concrete mortar fills the gap of the hole caused by the exit of the reamer ring 3, prevents the hole from collapsing by synchronous filling of the concrete mortar, and ensures the stability of the hole pouring;

[0043] After the reamer ring 3 returns to the initial position, the guiding slope at one end of the reamer ring 3 moves between the four sealing sliding blocks 6 again. Then, the four sealing sliding blocks 6 are driven to move towards the center by the action of the elastic giving way assembly, and the opening of the drilled hole is blocked by the contact and adhesion between the arc-shaped groove 7 and the supporting anchor rod 4, thereby preventing the concrete mortar from overflowing during pouring. After the concrete mortar is preliminarily solidified in the hole, the equipment is removed and the supporting anchor rod 4 stays in the poured hole, thereby completing the drilling, rod setting and pouring work at one time.

[0044] As a further implementation of the present application, the driving displacement assembly comprises a limiting ring 13 fixedly connected to one end of the reamer ring 3 close to the rear baffle 2, a plurality of light rods 14 are slidingly inserted on the reamer ring 3, the light rods 14 are all fixedly connected between the front baffle 1 and the rear baffle 2, a lead screw 15 is rotatably connected between the front baffle 1 and the rear baffle 2, the limiting ring 13 is threadedly connected to the lead screw 15, a motor 16 is fixedly installed on the rear baffle 2, and an output shaft of the motor 16 is fixedly connected to one end of the lead screw 15;

[0045] The output shaft of the motor 16 drives the lead screw 15 to rotate, and the limiting ring 13 is limited to move along the sliding insertion of the plurality of light rods 14 through the threaded connection of the lead screw 15 and the limiting ring 13, so as to drive the reamer ring 3 to move and drill, and when the output shaft of the motor 16 reversely rotates, the reamer ring 3 reversely moves and exits from the hole.

[0046] As a further implementation of the present application, the cooperating moving assembly comprises a fixed block 17 fixedly connected to one end of the extrusion pipe 10 away from the reamer ring 3, two limiting pins 18 are slidingly inserted on the fixed block 17, one end of the two limiting pins 18 penetrates through the rear baffle 2 and is fixedly connected to the limiting ring 13, two installation blocks 19 are fixedly connected to the rear baffle 2 in the circumferential direction, the adjacent side of the two installation blocks 19 is provided with a wedge-shaped stop block 20, two first connecting pins 21 are fixedly connected to the wedge-shaped stop block 20, the first connecting pins 21 are slidingly inserted in the corresponding installation blocks 19, a first spring 22 is sleeved on the first connecting pin 21, and the first spring 22 is fixedly connected between the corresponding wedge-shaped stop block 20 and the installation block 19;

[0047] When the limiting ring 13 drives the reaming ring 3 to move to the inside of the soil body, the two limiting pins 18 move synchronously with the limiting ring 13, and through the sliding limiting action of the limiting pins 18 on the fixed blocks 17, the fixed blocks 17 are pulled to move synchronously with the extrusion pipe 10, and through the extrusion pipe 10, the supporting anchor rod 4 is extruded to move synchronously to the inside of the soil body, and in the moving process, the fixed blocks 17 are close to the wedge-shaped stop blocks 20, and through the contact extrusion of the inclined surface of the wedge-shaped stop blocks 20 and the fixed blocks 17, the two wedge-shaped stop blocks 20 are away from each other and move to make room, and in the moving process, the wedge-shaped stop blocks 20 drive the first connecting pins 21 to move along the sliding insertion of the mounting blocks 19, and extrude the first springs 22 to generate compression deformation, when the fixed blocks 17 pass between the two wedge-shaped stop blocks 20 and are located between the rear baffle 2 and the wedge-shaped stop blocks 20, the first springs 22 are reset through elastic extension, and extrude the wedge-shaped stop blocks 20 to return to the initial position, so as to block the fixed blocks 17 and return, when the limiting ring 13 drives the reaming ring 3 to return, the limiting pins 18 move along the sliding insertion of the fixed blocks 17, and the fixed blocks 17 are blocked by the wedge-shaped stop blocks 20, so that the extrusion pipe 10 extrudes and limits the supporting anchor rod 4, so that the supporting anchor rod 4 is always located in the hole and cannot return with the reaming ring 3.

[0048] As a further embodiment of the present application, the elastic room component includes two second connecting pins 23, both of which are fixedly connected to the sealing sliding block 6, and the second connecting pins 23 are both slidingly inserted with connecting blocks 24, both of which are fixedly connected to the front baffle 1, and the second connecting pins 23 are both sleeved with second springs 25, which are fixedly connected between the sealing sliding block 6 and the corresponding connecting block 24;

[0049] When the reaming ring 3 moves to the slope direction, the guide inclined surface on the surface of the reaming ring 3 contacts and extrudes the sealing sliding block 6, and through the inclined surface, the sealing sliding block 6 is extruded to move and make room, the sealing sliding block 6 drives the second connecting pins 23 to move along the sliding insertion of the connecting blocks 24, so that the sealing sliding block 6 is rotated from the guide inclined surface of the reaming ring 3 to the annular surface of the reaming ring 3, and extrudes the second spring 25 to generate compression deformation, when the reaming ring 3 moves reversely and returns to the initial position, the second spring 25 is reset through elastic extension, and extrudes the sealing sliding block 6 to return to the initial position, so that the four sealing sliding blocks 6 block the circular groove 9 at the center of the contact plate 8, preventing the concrete mortar from overflowing from the hole.

[0050] As a further embodiment of the present application, as Figure 2 , Figure 3 and Figure 8As shown, four U-shaped rods 26 are slidably connected between the front baffle 1 and the rear baffle 2 in the circumferential direction, one end of each of the U-shaped rods 26 is fixedly connected to a corresponding sealing sliding block 6, and the other end of each of the U-shaped rods 26 is fixedly connected to a limiting plug rod 27, and four plug slots 28 are formed in the limiting ring 13 in the circumferential direction;

[0051] After the limiting ring 13 drives the hole expanding ring 3 to return to the initial position, the sealing sliding block 6 blocks the circular slot 9 at the center of the contact plate 8 through the elastic effect of the second spring 25, at this time, the hole expanding ring 3 is continuously moved by the limiting ring 13, the limiting ring 13 is continuously moved towards the rear baffle 2, and the limiting plug rod 27 is inserted into the corresponding plug slot 28 through the movement of the limiting ring 13, thereby positioning the sealing sliding block 6, preventing the sealing sliding block 6 from moving due to the pouring pressure impact of the concrete mortar during the blocking process, and ensuring the stability of the sealing.

[0052] As a further embodiment of the present application, an installation slot 29 is formed on one side of the sealing sliding block 6 close to the contact plate 8, and a pressure sensor 30 is fixedly installed in the installation slot 29;

[0053] When the sealing sliding block 6 blocks the concrete mortar in the hole, the pressure sensor 30 in the installation slot 29 detects the hydraulic pressure of the concrete mortar poured in the hole, and stops pouring when the pressure value reaches the pouring requirement.

[0054] As a further embodiment of the present application, a ring-shaped slot 31 is formed in the inside of the circular slot 9 (as shown in the figure), Figure 12 As shown, a ring-shaped shell 32 is fixedly connected in the ring-shaped slot 31, a plurality of drainage pipes 33 are fixedly connected in the inside of the ring-shaped shell 32 in the circumferential direction, a liquid inlet pipe 34 is fixedly connected to the outside of the ring-shaped shell 32, and one end of the liquid inlet pipe 34 extends to the outside of the contact plate 8 after penetrating through the contact plate 8;

[0055] The hole expanding ring 3 enters the slope protection soil body along the inside of the circular slot 9, and the surface of the hole expanding ring 3 is scraped by the circular slot 9 during the returning process, thereby removing the soil adhered to the surface of the hole expanding ring 3, the guide slope at one end of the hole expanding ring 3 cannot be cleaned by the circular slot 9 when passing through the inside of the circular slot 9, and the soil adhered to the guide slope can easily affect the fit degree of the sealing sliding block 6 and the hole expanding ring 3, thereby affecting the sealing and blocking of the sealing sliding block 6 to the concrete mortar, the water source pipe is connected to one end of the liquid inlet pipe 34, the clean water source enters the ring-shaped shell 32 along the liquid inlet pipe 34, and is sprayed out through the plurality of drainage pipes 33 in the inside of the ring-shaped shell 32, the guide slope of the hole expanding ring 3 is flushed by the drainage pipes 33 when passing through the inside of the circular slot 9, the cleanliness of the guide slope of the hole expanding ring 3 is ensured, the contact and fit degree of the hole expanding ring 3 and the sealing sliding block 6 is improved, and the sealing and blocking effect of the poured concrete mortar is ensured.

[0056] As a further embodiment of the present application, one end of the drainage pipe 33 is fixedly connected with a plurality of one-word-shaped nozzles 35;

[0057] By installing the one-word-shaped nozzles 35 on the drainage pipe 33, the lateral range of the cleaning water source is increased during flushing, the flushing water pressure is improved, and the cleaning effect of the guide inclined surface of the reamer ring 3 is improved.

[0058] As a further embodiment of the present application, a plurality of anti-skid rivets 36 are fixedly connected to the side of the contact plate 8 away from the front baffle 1 in a circumferential direction, and the plurality of anti-skid rivets 36 are all conical in structure;

[0059] By providing the plurality of anti-skid rivets 36 on the contact plate 8, when the contact plate 8 is in contact with the foundation pit slope, the plurality of anti-skid rivets 36 can be embedded into the surface of the slope and increase the contact friction between the contact plate 8 and the slope, preventing relative sliding between the contact plate 8 and the slope caused by drilling pressure, and improving the verticality and stability of the hole.

[0060] A drilling method of a deep foundation pit supporting drilling device, the method comprising the following steps:

[0061] Step one, the contact plate 8 is in contact with the foundation pit slope, and the reamer ring 3 is driven to move towards the front baffle 1 by the driving displacement assembly, the extrusion pipe 10 is synchronously moved by cooperating with the movement assembly, and the tip of the supporting anchor rod 4 is synchronously moved into the soil of the foundation pit slope by the contact and extrusion of the extrusion pipe 10 and the supporting anchor rod 4;

[0062] Step two, after the supporting anchor rod 4 moves to a fixed depth in the slope soil along with the reamer ring 3, the reamer ring 3 is reversely moved and returned to the initial position by the driving displacement assembly, and is in a static positioning state by cooperating with the movement assembly, so that the supporting anchor rod 4 still locates in the drilled hole, and the concrete mortar conveying pipe is connected at the end of the extrusion pipe 10 away from the front baffle 1, and the concrete mortar is conveyed along the inside of the extrusion pipe 10;

[0063] Step three, after the reamer ring 3 returns to the initial position, the guide inclined surface at one end of the reamer ring 3 moves to between the four sealing sliding blocks 6, then the four sealing sliding blocks 6 are driven to move close to the center by the elastic displacement assembly, and the opening of the drilled hole is blocked by the contact and fitting of the arc-shaped groove 7 and the supporting anchor rod 4.

[0064] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only the principles of the present application. Various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A drilling device for deep foundation pit support, comprising a front baffle (1) and a rear baffle (2), characterized in that, An expansion ring (3) is provided between the front baffle (1) and the rear baffle (2). A drive displacement component is provided on the expansion ring (3). A support anchor rod (4) is slidably inserted inside the expansion ring (3). The end of the support anchor rod (4) near the front baffle (1) is a pointed structure. A guide slope is provided at the end of the expansion ring (3) near the front baffle (1). A cross groove (5) is provided at the center of the front baffle (1). Four sealing sliders (6) are slidably connected in the cross groove (5) along the circumference. An arc groove (7) is provided on the inner side of the sealing slider (6). The four arc grooves (7) form a complete circular outline and slide against the surface of the support anchor rod (4). The sealing slider (6) contacts and adheres to the guide slope of the expansion ring (3). A contact plate (8) is fixedly connected to the side of the front baffle (1) away from the rear baffle (2). A circular groove (9) is provided at the center of the contact plate (8). The inner diameter of the circular groove (9) is the same as the diameter of the expansion ring (3). An elastic clearance component is provided on the sealing slider (6). A compression tube (10) is provided on the side of the rear baffle (2) away from the front baffle (1). One end of the compression tube (10) passes through the rear baffle (2) and contacts one end of the support anchor rod (4). The support anchor rod (4) has an injection hole (11) inside. Multiple discharge holes (12) are provided on the surface of the support anchor rod (4) near the front baffle (1) along the circumferential direction. All discharge holes (12) are connected to the injection hole (11). A matching moving component is provided on the compression tube (10). When the driving displacement component drives the expansion ring (3) to move in the direction of the front baffle (1), the matching moving component drives the compression tube (10) to move synchronously with the expansion ring (3). When the expansion ring (3) moves in the opposite direction, the compression tube (10) is in a stationary positioning state.

2. The drilling device for deep foundation pit support according to claim 1, characterized in that, The drive displacement assembly includes a limiting ring (13), which is fixedly connected to one end of the expanding ring (3) near the rear baffle (2). Multiple light rods (14) are slidably inserted on the expanding ring (3). The light rods (14) are all fixedly connected between the front baffle (1) and the rear baffle (2). A lead screw (15) is rotatably connected between the front baffle (1) and the rear baffle (2). The limiting ring (13) is threadedly connected to the lead screw (15). A motor (16) is fixedly installed on the rear baffle (2). The output shaft of the motor (16) is fixedly connected to one end of the lead screw (15).

3. The drilling device for deep foundation pit support according to claim 2, characterized in that, The moving component includes a fixed block (17), which is fixedly connected to the end of the extrusion tube (10) away from the expansion ring (3). Two limiting pins (18) are slidably inserted on the fixed block (17). One end of each limiting pin (18) passes through the rear baffle (2) and is fixedly connected to the limiting ring (13). Two mounting blocks (19) are fixedly connected to the rear baffle (2) along the circumferential direction. A wedge-shaped stop (20) is provided on the adjacent side of each of the two mounting blocks (19). Two first connecting pins (21) are fixedly connected to each of the wedge-shaped stop (20). The first connecting pins (21) are slidably inserted on the corresponding mounting blocks (19). A first spring (22) is sleeved on each of the first connecting pins (21). The first spring (22) is fixedly connected between the corresponding wedge-shaped stop (20) and the mounting block (19).

4. The drilling device for deep foundation pit support according to claim 2, characterized in that, The elastic clearance component includes two second connecting pins (23), both of which are fixedly connected to the sealing slider (6). Each of the second connecting pins (23) has a connecting block (24) slidably inserted into it. The connecting blocks (24) are fixedly connected to the front baffle (1). A second spring (25) is sleeved on the second connecting pin (23), and the second spring (25) is fixedly connected between the sealing slider (6) and the corresponding connecting block (24).

5. The drilling device for deep foundation pit support according to claim 4, characterized in that, Four U-shaped rods (26) are slidably connected between the front baffle (1) and the rear baffle (2) along the circumference. One end of the U-shaped rod (26) is fixedly connected to the corresponding sealing slider (6), and the other end of the U-shaped rod (26) is fixedly connected to the limit plug rod (27). Four plug slots (28) are opened on the limit ring (13) along the circumference.

6. The drilling device for deep foundation pit support according to claim 5, characterized in that, One of the sealing sliders (6) has a mounting groove (29) on the side near the contact plate (8), and a pressure sensor (30) is fixedly installed inside the mounting groove (29).

7. The drilling device for deep foundation pit support according to claim 1, characterized in that, The circular groove (9) has an annular groove (31) inside. An annular shell (32) is fixedly connected in the annular groove (31). Multiple drain pipes (33) are fixedly connected to the inner side of the annular shell (32) along the circumferential direction. An inlet pipe (34) is fixedly connected to the outer side of the annular shell (32). One end of the inlet pipe (34) passes through the contact plate (8) and extends to the outside of the contact plate (8).

8. A drilling device for deep foundation pit support according to claim 7, characterized in that, One end of each drain pipe (33) is fixedly connected to a straight nozzle (35).

9. A drilling device for deep foundation pit support according to claim 1, characterized in that, Multiple anti-slip rivets (36) are fixedly connected circumferentially on the side of the contact plate (8) away from the front baffle (1), and all the multiple anti-slip rivets (36) are conical structures.

10. A drilling method for a deep foundation pit support drilling device, applicable to the deep foundation pit support drilling device described in any one of claims 1-9, characterized in that, The method includes the following steps: Step 1: Make the contact plate (8) contact and fit with the foundation pit slope protection, and drive the expansion ring (3) to move towards the front baffle (1) through the drive displacement component. Drive the extrusion tube (10) to move synchronously through the action of the moving component. And through the contact and extrusion of the extrusion tube (10) and the support anchor (4), make the tip of the support anchor (4) move synchronously into the soil of the foundation pit slope protection to drill holes. Step 2: After the expansion ring (3) moves to a fixed depth in the slope protection soil, the drive displacement component drives the expansion ring (3) to move in the opposite direction and return to the initial position. By cooperating with the action of the moving component, it is in a static positioning state, so that the support anchor (4) is still in the drilled hole. A concrete mortar conveying pipe is connected at the end of the extrusion pipe (10) away from the front baffle (1), and the concrete mortar is conveyed along the inside of the extrusion pipe (10). Step 3: After the expansion ring (3) returns to its initial position, the guide slope at one end of the expansion ring (3) moves back to between the four sealing sliders (6). Then, through the action of the elastic clearance component, the four sealing sliders (6) are driven to move closer to the center and are sealed at the opening of the drill hole by contacting and fitting with the support anchor rod (4) through the arc groove (7).

Images