Rotary jet grouting drill anchor head capable of improving stability of reinforced surface and provided with detachable core

Abstract

The utility model discloses a core-detachable rotary jet grouting drill anchor head capable of improving the stability of a reinforced surface, and relates to the technical field of geotechnical engineering, in particular to the core-detachable rotary jet grouting drill anchor head capable of improving the stability of the reinforced surface. Comprising a drill bit core tube, a fixing mechanism, a first-stage pressurizing assembly, a second-stage pressurizing assembly, drill bit blades, a normal-pressure grout outlet, a second-stage rotary spraying grout outlet and a first-stage rotary spraying grout outlet, the drill bit blades are arranged on the lower side of the outer portion of the drill bit core tube, and the normal-pressure grout outlet is formed between the drill bit core tube and the drill bit blades; a second-stage rotary spraying slurry outlet and a first-stage rotary spraying slurry outlet are formed in the upper portion and the lower portion of the outer wall of the drill bit core pipe respectively, a first-stage pressurizing assembly and a second-stage pressurizing assembly are arranged in the drill bit core pipe, and a fixing mechanism is arranged outside the drill bit core pipe. Compared with the prior art, the utility model has the advantages that a plurality of columnar anchoring bodies are added, so that the frictional resistance is increased, and the mechanical property of a reinforced surface is improved; and the core is convenient to disassemble and recycle.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering, in particular to a detachable core jet grouting drill anchor head for improving the stability of the reinforcement surface. Background Technique

[0002] The jet grouting drill anchor head is a high-pressure jet grouting anchor cable construction technology used for deep foundation pit support. This technology uses a special jet grouting drill bit to spray cement slurry in the soil, and at the same time, the anchor cable is sent into the hole together during the hole-forming process, forming an integral structure. After applying prestress, a high-pressure jet grouting anchor cable is formed. This construction method is suitable for different geological and site conditions, especially in saturated soil layers. Compared with the traditional casing following hole-forming method, the high-pressure jet grouting anchor cable construction has the advantages of convenient construction, cost saving, etc., and can effectively solve the problems such as hole collapse, difficult hole-forming, and diameter reduction that are prone to occur in traditional anchor cable construction.

[0003] Although the prior art has solved certain problems, it still has the following disadvantages:

[0004] (1) At present, in the anchor cable drilling construction of underground projects, subways, tunnels, railways, bridges, etc., the anchor heads mostly used can only form a columnar anchor solid. Through a high-pressure spraying device, the mixing liquid is sprayed out at a high speed from the spraying port, directly mixed with the damaged geological soil layer for full stirring, and an irregular columnar anchor solid is formed in the soil. Due to the uncertainty of the formation, during the construction process in soft soil layers or sandy soil layers, when the steel strand is pulled out from the anchor cable body for recycling by the pulling method, due to uncertain reasons such as excessive force and poor formation soil quality, the anchor solid will be taken out together, thus destroying the stability of the overall reinforcement surface.

[0005] (2) After the anchor is used up, most of the anchors are left inside the drill hole, and the disassembly of the anchor cable is troublesome and not convenient for recycling. Content of the Utility Model

[0006] The purpose of the utility model is to provide a detachable core jet grouting drill anchor head for improving the stability of the reinforcement surface.

[0007] To achieve the above purpose, the utility model is realized through the following technical solutions:

[0008] A detachable core jet grouting drill anchor head for improving the stability of the reinforcement surface, comprising:

[0009] A drill bit core pipe, the lower end of the drill bit core pipe is fixedly connected with drill bit blades, and a number of evenly distributed normal pressure slurry outlets are arranged at the connection between the drill bit core pipe and the drill bit blades. A number of evenly distributed primary jet grouting slurry outlets are opened on the lower side of the outer wall of the drill bit core pipe, and a number of evenly distributed secondary jet grouting slurry outlets are opened on the upper side of the outer wall of the drill bit core pipe;

[0010] Fixing mechanism, the fixing mechanism is arranged outside the drill bit core pipe, and the fixing mechanism includes a first-stage pressure receiving plate, a second-stage pressure receiving plate, a connecting plate, a stop block and a U-shaped steel strand. The first-stage pressure receiving plate is sleeved on the lower side outside the drill bit core pipe, the second-stage pressure receiving plate is sleeved on the upper side outside the drill bit core pipe, the connecting plates are respectively fixedly connected to the front and rear of the lower side outside the first-stage pressure receiving plate, the stop blocks are respectively fixedly connected to the front, rear and two sides of the lower end outside the second-stage pressure receiving plate, and the U-shaped steel strand is arranged between the first-stage pressure receiving plate and the second-stage pressure receiving plate;

[0011] First-stage pressurizing assembly, the first-stage pressurizing assembly is arranged between the first-stage rotary jet grouting outlet and the drill bit core pipe. The first-stage pressurizing assembly includes a first-stage rotary jet grouting collar and a first-stage rotary jet grouting ball. The first-stage rotary jet grouting collar is arranged on the lower side inside the drill bit core pipe, the first-stage rotary jet grouting ball is arranged inside the first-stage rotary jet grouting collar, and the first-stage rotary jet grouting ball is adapted to the inside of the first-stage rotary jet grouting collar;

[0012] Second-stage pressurizing assembly, the second-stage pressurizing assembly is arranged between the second-stage rotary jet grouting outlet and the drill bit core pipe. The second-stage pressurizing assembly includes a second-stage rotary jet grouting collar and a second-stage rotary jet grouting ball. The second-stage rotary jet grouting collar is arranged on the upper side inside the drill bit core pipe, the second-stage rotary jet grouting ball is arranged inside the second-stage rotary jet grouting collar, and the second-stage rotary jet grouting ball is adapted to the inside of the second-stage rotary jet grouting collar.

[0013] Furthermore, the first-stage pressure receiving plate is located on the lower side outside the first-stage rotary jet grouting outlet, the second-stage pressure receiving plate is located on the lower side outside the second-stage rotary jet grouting outlet, and both the first-stage pressure receiving plate and the second-stage pressure receiving plate are rotatably connected to the outside of the drill bit core pipe.

[0014] Furthermore, threading cavities for the use of the U-shaped steel strand are respectively formed inside the connecting plates, card slots for the use of the U-shaped steel strand are respectively formed on the lower sides of the stop blocks, communication holes for the use of the U-shaped steel strand are respectively formed on the front, rear and two sides of the upper end outside the second-stage pressure receiving plate, and the inside of the communication holes is respectively connected to the inside of the card slots in a penetrating manner.

[0015] Furthermore, the aperture of the first-stage rotary jet grouting outlet is smaller than that of the normal-pressure grouting outlet, the aperture of the second-stage rotary jet grouting outlet is smaller than that of the first-stage rotary jet grouting outlet, and the inner diameter of the first-stage rotary jet grouting collar is smaller than that of the second-stage rotary jet grouting collar.

[0016] Furthermore, a drill bit core pipe drilling edge is sleeved on the upper end outside the drill bit core pipe, the drill bit core pipe drilling edge is rotatably connected to the upper side outside the drill bit core pipe, anti-clamping rings are respectively arranged on the upper sides of the outside of the first-stage pressure receiving plate and the second-stage pressure receiving plate, and the anti-clamping rings are respectively rotatably connected to the outside of the drill bit core pipe.

[0017] The present utility model provides a detachable core rotary jet grouting anchor head for improving the stability of the reinforcement surface, having the following

[0018] Beneficial effects:

[0019] (1) The multi-stage jet grouting detachable core drill anchor head, through the setting of the built-in normal pressure slurry outlet, the first-stage jet grouting slurry outlet, the second-stage jet grouting slurry outlet, the first-stage jet grouting ball stopper, and the second-stage jet grouting ball stopper, finally completes the first-stage jet grouting body and the second-stage jet grouting body. It increases multiple columnar anchor solids from a single columnar anchor solid in the traditional process, thereby generating multi-stage anti-sliding resistance and increasing the frictional resistance, thus improving the mechanical properties of the reinforced surface and efficiently controlling the displacement of the reinforced body to promote the stability of the reinforced surface.

[0020] (2) By fixing one end of the U-shaped steel strand on the steel strand pulling device, pulling out the steel strand and gradually recovering it, it is convenient to recover the anchor cable and facilitate repeated use. And the steel strand exists in a U shape inside the borehole. When tensioning, the tension of the steel strand is transformed into pressure and acts on the anchor solid through the bending semi-circular plate and the bearing plate, giving full play to the advantages of the three-way constraint state and high compressive strength in the soil layer where the anchor is located, which can greatly improve the bearing capacity of the anchor cable. The U-shaped state of the steel strand has good stability and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0022] Figure 1 is a three-dimensional view of a detachable core jet grouting drill anchor head for improving the stability of the reinforced surface of the present invention Figure 1 .

[0023] Figure 2 is a three-dimensional view of a detachable core jet grouting drill anchor head for improving the stability of the reinforced surface of the present invention Figure 2 .

[0024] Figure 3 is a partial three-dimensional view of a detachable core jet grouting drill anchor head for improving the stability of the reinforced surface of the present invention Figure 1 .

[0025] Figure 4 is a partial three-dimensional view of a detachable core jet grouting drill anchor head for improving the stability of the reinforced surface of the present invention Figure 2 .

[0026] Figure 5 is a schematic diagram of the normal pressure columnar anchor solid of a detachable core jet grouting drill anchor head for improving the stability of the reinforced surface of the present invention.

[0027] Figure 6 is a schematic diagram of the first-stage jet grouting columnar anchor solid of a detachable core jet grouting drill anchor head for improving the stability of the reinforced surface of the present invention.

[0028] Figure 7 It is a schematic diagram of a secondary jet grouting columnar anchor solid of a detachable core jet grouting drill anchor head for improving the stability of the reinforcement surface in the utility model.

[0029] In the figure: 1, drill bit core tube; 2, fixing mechanism; 201, primary pressure receiving plate; 202, secondary pressure receiving plate; 203, connecting plate; 204, stop block; 205, U-shaped steel strand; 3, primary pressure boosting assembly; 301, primary jet grouting clamping ring; 302, primary jet grouting clamping ball; 4, secondary pressure boosting assembly; 401, secondary jet grouting clamping ring; 402, secondary jet grouting clamping ball; 5, drill bit blade; 6, normal pressure slurry outlet; 7, primary jet grouting slurry outlet; 8, secondary jet grouting slurry outlet; 9, wire threading cavity; 10, card slot; 11, communication hole; 12, drill moving edge of drill bit core tube; 13, anti-clamping ring. Detailed implementation manners

[0030] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] Embodiment 1:

[0033] As Figures 1 to 6 shown, this embodiment proposes a detachable core jet grouting drill anchor head for improving the stability of the reinforcement surface, including a drill bit core tube 1, a fixing mechanism 2, a primary pressure boosting assembly 3, a secondary pressure boosting assembly 4, a drill bit blade 5, a normal pressure slurry outlet 6, and a plurality of uniformly distributed secondary jet grouting slurry outlets 8 and primary jet grouting slurry outlets 7 respectively opened on the upper and lower sides outside the drill bit core tube 1.

[0034] Among them, an arrow-shaped drill blade 5 is fixedly connected to the outer lower end of the tubular drill core pipe 1. Four gaps are left at the connection between the drill core pipe 1 and the drill blade 5. These four gaps facilitate the cement mortar injected into the drill core pipe 1 to spray out from its lower end, which is called the normal pressure slurry outlet 6. A secondary pressure-receiving plate 202 and a primary pressure-receiving plate 201 are respectively arranged above and below the outside of the drill core pipe 1. Both the primary pressure-receiving plate 201 and the secondary pressure-receiving plate 202 are rotatably connected to the outside of the drill core pipe 1. And snap rings are arranged above and below the outside of the drill core pipe 1. The secondary pressure-receiving plate 202 and the primary pressure-receiving plate 201 are respectively located below the upper and lower two snap rings. And anti-snap rings 13 are arranged on the upper sides of the outsides of the primary pressure-receiving plate 201 and the secondary pressure-receiving plate 202. The snap rings are used to assist in fixing the two pressure-receiving plates, preventing the pressure-receiving plates from shifting or falling off, and playing a role in correction. The two pressure-receiving plates are rotatably connected to the outside of the drill core pipe 1 together. The anti-snap rings 13 are used to relieve the drilling pressure and play a role in buffering to replace the rubber pads. And when the drill pipe drills at a high frequency, the anti-snap rings 13 will also rotate with it.

[0035] A number of uniformly distributed secondary rotary slurry outlets 8 and primary rotary slurry outlets 7 are respectively opened above and below the outside of the drill core pipe 1. The secondary rotary slurry outlets 8 are on the upper side of the outside of the secondary pressure-receiving plate 202, and the primary rotary slurry outlets 7 are on the upper side of the outside of the primary pressure-receiving plate 201. Connecting plates 203 are fixedly connected to the front and back of the lower end of the outside of the primary pressure-receiving plate 201. Semi-circular wire threading cavities 9 are opened inside the connecting plates 203. Both sides inside the wire threading cavities 9 are connected to the upper side of the outside of the primary pressure-receiving plate 201 in a through manner. Blocks 204 are fixedly connected to the front, back, and both sides of the lower end of the outside of the secondary pressure-receiving plate 202. Semi-circular card slots 10 are opened on the lower sides of the blocks 204. Communication holes 11 that are connected to the inside of the card slots 10 in a through manner are opened on the front, back, and both sides of the upper end of the outside of the secondary pressure-receiving plate 202. One ends of two U-shaped steel stranded wires 205 between the primary pressure-receiving plate 201 and the secondary pressure-receiving plate 202 pass through one side of the communication holes 11 and then penetrate into the inside of the wire threading cavities 9, and then pass through the inside of the communication holes 11 on the other side from the lower side to lift the pressure-receiving plates. And the wound U-shaped steel stranded wires 205 can be fixed by using the card slots 10. A drill core pipe drilling edge 12 is sleeved on the upper end of the outside of the drill core pipe 1. The drill rod is operated to rotate so that it can effectively rotate in the same frequency and in the same direction to drive the drill blade 5 to rotate continuously, so as to fully stir and finally form an irregular columnar anchor body.

[0036] Embodiment 2:

[0037] The solution in Embodiment 1 will be further introduced below in combination with the specific working mode. See the following description for details:

[0038] In order to vary the pressure of the cement mortar ejected inside the drill bit core pipe 1, the ejected mortar forms multiple columnar anchor bodies, generating multi-level anti-slip resistance, increasing the frictional resistance, and improving the mechanical properties of the reinforcement surface. A first-stage jet grouting collar 301 is provided on the lower side inside the drill bit core pipe 1. The first-stage jet grouting collar 301 is on the lower side outside the first-stage jet grouting outlet 7, and the first-stage jet grouting collar 301 is fixedly connected to the inner wall of the drill bit core pipe 1. The inside of the first-stage jet grouting collar 301 is blocked by a first-stage jet grouting ball 302, so that the cement mortar originally ejected from the inside of the atmospheric pressure outlet 6 sprays outwards from the inside of the first-stage jet grouting outlet 7 with a smaller aperture, increasing the pressure of the ejected cement mortar. At the upper side position inside the drill bit core pipe 1, a second-stage jet grouting collar 401 is also provided. The second-stage jet grouting collar 401 is on the lower side outside the second-stage jet grouting outlet 8, and the outer side of the second-stage jet grouting collar 401 is also fixedly connected to the inner wall of the drill bit core pipe 1. The hole inside the second-stage jet grouting collar 401 is blocked by a second-stage jet grouting ball 402. In this way, the cement mortar originally ejected from the first-stage jet grouting outlet 7 can only spray out from the inside of the second-stage jet grouting outlet 8 with a smaller aperture for further pressure increase. And the inner diameter of the second-stage jet grouting collar 401 is larger than the inner diameter of the first-stage jet grouting collar 301, so that the first-stage jet grouting ball 302 can fall down.

[0039] Inject the well-mixed slurry into the inside of the drill bit core pipe 1. First, spray out the atmospheric pressure cement slurry through the atmospheric pressure outlet 6, and at the same time mix it with the soil quality in the damaged soil layer. Since the drill bit blades 5 keep rotating, it is fully stirred to finally form irregular columnar anchor bodies. When the drilling depth is reached, the first-stage jet grouting ball 302 is put into the inside of the drill bit core pipe 1. The first-stage jet grouting ball 302 will block the hole inside the first-stage jet grouting collar 301. After high-pressure grouting, the first-stage jet grouting outlet 7 is smaller than the atmospheric pressure outlet 6, so the jetting pressure is higher. The high-pressure cement slurry sprays out from the first-stage jet grouting outlet 7 to form irregular columnar anchor bodies (first-stage jet grouting columnar anchor bodies), as Figure 7 shown.

[0040] After completing the grouting and jetting task in this stage, the first-stage jet grouting ball 302 still remains inside the first-stage jet grouting collar 301. At this time, the second-stage jet grouting ball 402 is put into the inside of the drill bit core pipe 1. The second-stage jet grouting ball 402 blocks the inside of the second-stage jet grouting collar 401. After high-pressure grouting, the second-stage jet grouting outlet 8 will spray out high-pressure water slurry with a greater pressure, and fully mix and stir with the soil quality in the surrounding soil layer to form irregular columnar anchor bodies (second-stage jet grouting columnar anchor bodies). After reaching the strength required by the design, the U-shaped steel strand 205 brought into the soil layer is withdrawn. At this time, an irregular multi-level anchor body is formed in the soil layer. After the anchor cable is used up, remove the anchor fitting. Clamp one end of the U-shaped steel strand 205 with a steel strand pulling device, and gradually retract the U-shaped steel strand 205 to facilitate the removal and recovery of the core of the used anchor head.

[0041] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detachable core jet grouting drill anchor head for improving the stability of the reinforcement surface, characterized in that: include: A drill core tube (1), the lower end of the drill core tube (1) is fixedly connected to a drill blade (5), a plurality of evenly distributed normal pressure slurry outlets (6) are provided at the connection between the drill core tube (1) and the drill blade (5), a plurality of evenly distributed primary rotary slurry outlets (7) are provided on the lower side of the outer wall of the drill core tube (1), and a plurality of evenly distributed secondary rotary slurry outlets (8) are provided on the upper side of the outer wall of the drill core tube (1); A fixing mechanism (2), the fixing mechanism (2) being arranged outside the drill core tube (1), the fixing mechanism (2) comprising a primary pressure plate (201), a secondary pressure plate (202), a connecting plate (203), a stopper (204) and a U-shaped steel strand (205), the primary pressure plate (201) being sleeved on the lower side of the outside of the drill core tube (1), the secondary pressure plate (202) being sleeved on the upper side of the outside of the drill core tube (1), the connecting plate (203) being respectively fixedly connected to the front and rear of the lower side of the outside of the primary pressure plate (201), the stopper (204) being respectively fixedly connected to the front and rear and the same two sides of the lower end of the outside of the secondary pressure plate (202), and the U-shaped steel strand (205) being arranged between the primary pressure plate (201) and the secondary pressure plate (202); A first-stage booster assembly (3), the first-stage booster assembly (3) being arranged between the first-stage jet slurry outlet (7) and the drill core tube (1), the first-stage booster assembly (3) comprising a first-stage jet clamp ring (301) and a first-stage jet clamp ball (302), the first-stage jet clamp ring (301) being arranged at the lower side of the drill core tube (1), the first-stage jet clamp ball (302) being arranged inside the first-stage jet clamp ring (301), and the first-stage jet clamp ball (302) being adapted to the inside of the first-stage jet clamp ring (301); A secondary boosting component (4) is arranged between a secondary jet slurry outlet (8) and a drill core tube (1), and the secondary boosting component (4) comprises a secondary jet clamping ring (401) and a secondary jet clamping ball (402). The secondary jet clamping ring (401) is arranged on the upper side of the drill core tube (1), and the secondary jet clamping ball (402) is arranged inside the secondary jet clamping ring (401), and the secondary jet clamping ball (402) is adapted to the inside of the secondary jet clamping ring (401).

2. A detachable core jet grouting drill anchor head for improving the stability of the reinforcement surface according to claim 1, characterized in that: The first-level pressure plate (201) is located at the lower side of the outside of the first-level rotary jet slurry outlet (7), and the second-level pressure plate (202) is located at the lower side of the outside of the second-level rotary jet slurry outlet (8). The first-level pressure plate (201) and the second-level pressure plate (202) are both rotatably connected to the outside of the drill core tube (1).

3. The detachable core jet grouting drill anchor head for improving the stability of the reinforcement surface according to claim 1, characterized in that: The connection plate (203) is provided with a threading cavity (9) for use with the U-shaped steel strand (205), the lower side of the stopper (204) is provided with a slot (10) for use with the U-shaped steel strand (205), and the front and rear sides of the upper end of the secondary pressure plate (202) are provided with connecting holes (11) for use with the U-shaped steel strand (205), and the interior of the connecting hole (11) is connected to the interior of the slot (10).

4. The detachable core jet grouting drill anchor head for improving the stability of the reinforcement surface according to claim 1, characterized in that: The aperture of the first-stage rotary jet outlet (7) is smaller than that of the normal pressure outlet (6), the aperture of the second-stage rotary jet outlet (8) is smaller than that of the first-stage rotary jet outlet (7), and the inner diameter of the first-stage rotary jet clamp (301) is smaller than that of the second-stage rotary jet clamp (401).

5. The detachable core jet grouting drill anchor head for improving the stability of the reinforcement surface according to claim 1, characterized in that: The outer upper end of the drill core tube (1) is sleeved with a drill core tube drilling edge (12), and the drill core tube drilling edge (12) is rotatably connected to the outer upper side of the drill core tube (1). The outer upper sides of the first-level pressure plate (201) and the second-level pressure plate (202) are both provided with anti-clamping rings (13), and the anti-clamping rings (13) are both rotatably connected to the outer side of the drill core tube (1).

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