An external wall water stop screw hydraulic cutting device and its installation method and use method

Abstract

The application provides a kind of hydraulic cutting device of external wall water stop screw and its installation method and use method, including shell, handle located outside shell, blade assembly for cutting water stop screw, positioning sleeve set on water stop screw and abutting against the innermost wall surface of recess, limit baffle adhering concrete outer wall surface, hydraulic cylinder and manual hydraulic pump are equipped in the shell, the manual hydraulic pump is communicated with hydraulic cylinder by hydraulic oil circuit, reset elastic member is equipped in the hydraulic cylinder, one end of reset elastic member abuts against piston in hydraulic cylinder, the other end of reset elastic member abuts against the end wall of hydraulic cylinder for piston rod to extend, the blade assembly is detachably connected with piston rod of hydraulic cylinder, positioning sleeve and limit baffle are detachably connected with the same side of shell, limit baffle is equipped with through hole for positioning sleeve to pass through, positioning sleeve and the clearance fit of through hole, handle is connected with the driving end of manual hydraulic pump.

Description

Technical Field

[0001] This invention relates to the field of building construction tools, and in particular to a hydraulic cutting device for external wall waterstop screws, its installation method, and its usage method. Background Technology

[0002] Water-stop tie rods are tie rods with water-stop flanges, widely used in formwork support systems for cast-in-place concrete walls requiring waterproofing. Unlike ordinary tie rods, water-stop tie rods have a water-stop steel plate or water-stop flange welded to the middle, embedded inside the wall to stop water seepage. The two ends of the water-stop tie rod extend out of the wall for formwork fixing. After formwork removal, the treatment of exposed water-stop tie rods is a necessary procedure; improper treatment can lead to leakage, damage to the decorative layer, and structural corrosion.

[0003] Currently, the commonly used processing methods in the industry include:

[0004] Gas welding cutting: The screw is melted by acetylene-oxygen flame, but the open flame produced poses a risk of combustion and explosion in poorly ventilated environments such as basements. The high temperature burns the surrounding concrete, causing micro-cracks. The cut is uneven and requires secondary grinding. In addition, the operators must be certified and acetylene cylinders are dangerous chemicals and their transportation and storage are restricted.

[0005] Angle grinder grinding: Using a handheld angle grinder with diamond blades to grind the screw directly, but the dust is serious and harmful to the respiratory system, the cutting direction is difficult to be perpendicular to the wall, resulting in an uneven and tilted cut, the grinding wheel may break and cause injury, and it takes about 5 to 8 minutes per screw, which is inefficient.

[0006] Electric hydraulic shears: These are hydraulic rebar shears driven by batteries, but the equipment is relatively heavy (5-10kg), causing fatigue from prolonged hand use. The battery life is also limited, and the fixed blade opening does not conform well to the wall surface, resulting in cuts protruding from the wall. Purchase and maintenance costs are also relatively high.

[0007] In addition, all of the above-mentioned existing technologies have a common problem: after the template is removed, the exposed end of the water-stop screw is often located in the groove inside the template cavity. The groove depth is generally 15-25mm. Existing tools cannot push the blade to the bottom of the groove to cut against the wall surface, resulting in the cut protruding 5-15mm from the wall surface. Secondary grinding is required, which increases the process and labor costs.

[0008] In summary, existing cutting methods generally have problems such as open flame safety hazards, dust pollution, poor cut quality, low work efficiency, and inability to deal with grooves inside the template cavity. The safety risks are even more prominent when working in enclosed spaces such as basements.

[0009] Therefore, it is necessary to design a new hydraulic cutting device for external wall waterstop screws to overcome the above problems. Summary of the Invention

[0010] The purpose of this invention is to overcome the defects of the prior art and provide an external wall water-stop screw hydraulic cutting device and its installation and usage methods. This invention solves at least some of the problems in the prior art.

[0011] This invention is implemented as follows:

[0012] This invention provides a hydraulic cutting device for exterior wall water-stop screws, comprising a housing, a handle located outside the housing, a blade assembly for cutting the water-stop screw, a positioning sleeve sleeved on the water-stop screw and pressed against the innermost side wall of the groove, and a limiting baffle conforming to the concrete exterior wall. The housing contains a hydraulic cylinder and a manual hydraulic pump. The manual hydraulic pump is connected to the hydraulic cylinder via a hydraulic oil circuit. The hydraulic cylinder contains a reset elastic element, one end of which abuts against a piston inside the hydraulic cylinder, and the other end of which abuts against the end wall of the hydraulic cylinder where the piston rod extends. The blade assembly is detachably connected to the piston rod of the hydraulic cylinder. The positioning sleeve and the limiting baffle are both detachably connected to the same side of the housing. The limiting baffle has a through hole for the positioning sleeve to pass through, and the positioning sleeve is clearance-fitted with the through hole. The handle is connected to the drive end of the manual hydraulic pump.

[0013] Furthermore, the reset elastic element is a reset spring, which is sleeved on the piston rod of the hydraulic cylinder.

[0014] Furthermore, the blade assembly includes a blade body, with a blade on each of the opposite sides of the blade body. The blades are provided with cutting edges to facilitate cutting the water-stop screw. The blade body is snap-fitted to the end of the piston rod.

[0015] Furthermore, a heat-dissipating copper base is fixed on the non-shearing surface of the blade assembly.

[0016] Furthermore, the hydraulic cutting device for the external wall water-stop screw also includes an extended guide sleeve for extending the positioning sleeve, the extended guide sleeve being coaxial with the positioning sleeve and detachably connected.

[0017] Furthermore, both the housing and the extended guide sleeve are threadedly connected to the positioning sleeve.

[0018] Furthermore, the limiting baffle and the housing are connected by bolts.

[0019] Furthermore, the handle is connected to the drive end of the manual hydraulic pump via a lever.

[0020] The present invention also provides an installation method for an external wall water-stop screw hydraulic cutting device, comprising the following steps:

[0021] S1. Insert the reset elastic element into the piston rod and install it into the hydraulic cylinder, so that one end of the reset elastic element abuts against the piston inside the hydraulic cylinder, and the other end of the reset elastic element abuts against the end wall of the hydraulic cylinder where the piston rod extends.

[0022] S2. Secure the blade assembly to the front end of the piston rod;

[0023] S3. Install the hydraulic cylinder into the housing, so that the piston rod and blade assembly protrude from the front opening of the housing, and then fix the end cap of the hydraulic cylinder.

[0024] S4. Install the manual hydraulic pump inside the housing. The manual hydraulic pump is connected to the hydraulic cylinder through the hydraulic oil circuit.

[0025] S5. The limiting baffle is fixed at the front end of the housing, so that the plane of the limiting baffle is perpendicular to the movement direction of the blade assembly, and the center hole of the limiting baffle is aligned with the movement axis of the blade.

[0026] S6. Fix the positioning sleeve to the front end of the housing, making the positioning sleeve coaxial with the movement direction of the blade assembly, and make the blade assembly and the heat dissipation copper base extend into the positioning sleeve; depending on the construction needs, choose whether to add an extension guide sleeve to the positioning sleeve for extension.

[0027] S7. The handle is hinged to the lever, and the lever is connected to the drive end of the manual hydraulic pump via a hinge pin.

[0028] S8. Inject hydraulic oil into the manual hydraulic pump through the filler port, press the handle repeatedly to expel air from the hydraulic oil circuit, and complete the assembly of the device.

[0029] The present invention also provides a method for using the hydraulic cutting device for external wall waterstop bolts, comprising the following steps:

[0030] S1. Before construction, select the corresponding specification of positioning sleeve according to the diameter of the water-stop screw, and install the positioning sleeve to the front end of the shell; if the groove depth of the concrete exterior wall is greater than 15mm, add an extension guide sleeve to the positioning sleeve to extend the length of the positioning sleeve.

[0031] S2. Remove the plastic plug from the exposed end of the water-stop bolt on the concrete exterior wall;

[0032] S3. Insert the positioning sleeve and the extended guide sleeve into the exposed water-stop screw rod, and push the device to make the limit baffle completely fit the concrete exterior wall surface.

[0033] S4. Manually press the handle repeatedly to amplify the pressing force through the labor-saving lever, drive the manual hydraulic pump to press hydraulic oil into the hydraulic cylinder through the hydraulic oil circuit, and the hydraulic oil pushes the piston to drive the piston rod and blade assembly to extend outward.

[0034] S5. The blade assembly passes through the positioning sleeve and the extended guide sleeve in sequence. Under the action of hydraulic thrust, the blade presses against the water-stop screw, generating a shearing effect and cutting the water-stop screw against the wall at the deepest part of the groove.

[0035] S6. Release the handle, and the reset elastic element will push the piston rod and blade assembly to automatically return to their original positions;

[0036] S7. Remove the positioning sleeve and extended guide sleeve from the housing, move the device to the next water-stop screw, and repeat steps S3 to S6.

[0037] The present invention has the following beneficial effects:

[0038] 1. Wall-based cutting: In this invention, the positioning sleeve and the limiting baffle are designed in tandem. The limiting baffle has a through hole in the middle, through which the positioning sleeve passes. The positioning sleeve and the through hole are fitted with a clearance fit, and the through hole restricts the radial movement of the positioning sleeve. The front end of the positioning sleeve extends into the groove of the concrete exterior wall, and the end abuts against the inner wall of the deepest part of the groove, playing an axial positioning role. The limiting baffle fits against the concrete exterior wall surface as a positioning reference. The positioning sleeve and the limiting baffle work together to ensure that the blade accurately reaches the cutting position. The blade passes through the positioning sleeve and extends into the conical groove, cutting the water-stop screw tightly against the wall surface at the deepest part of the groove. This ensures that the cut protrudes from the wall surface by no more than 1mm, eliminating the need for secondary grinding and reducing the quality rework rate from 25%–30% to less than 3%.

[0039] 2. Addressing the inner cavity groove of the template: In this invention, two types of extended guide sleeves, 30mm and 40mm, are configured to address construction scenarios where the inner cavity of the template is 15-25mm deep, solving the technical problem that existing tools cannot reach the bottom of the groove to cut against the wall surface.

[0040] 3. Labor-saving operation: In this invention, the labor-saving lever ratio is ≥1:8, and the pressure of the handle is amplified by more than 8 times and transmitted to the hydraulic pump, reducing the labor intensity of the operator and making it suitable for long-term continuous operation.

[0041] 4. High-efficiency heat dissipation: In this invention, the blade assembly integrates a heat dissipation copper base, which effectively dissipates heat during continuous cutting, preventing the blade from overheating and softening or sticking, and extending the blade's service life.

[0042] 5. Lightweight and portable: In this invention, the hydraulic cylinder is optimized to a small diameter of φ28mm, and can output 15kN shearing force with 25MPa. The weight of the whole machine is controlled within 2.8kg, and the folding handle is easy to carry.

[0043] 6. High safety: This invention uses manual hydraulic transmission, which requires no power supply or open flame, eliminating the risk of fire, explosion and electric shock during construction in enclosed spaces such as basements.

[0044] 7. Improved efficiency: Using the hydraulic cutting device provided by this invention, the single-root cutting time is reduced from 6-7 minutes to about 2.5 minutes, improving efficiency by about 170%.

[0045] 8. Multi-purpose: This invention can be adapted to four common water-stop screws of φ12~φ18mm by changing the positioning sleeve, and the extended guide sleeve can cope with different groove depths.

[0046] 9. Economic efficiency: The overall construction cost of this invention is about 64% lower than that of traditional methods, and the device can be reused repeatedly.

[0047] 10. Green and environmentally friendly: The hydraulic cutting device provided by this invention has no dust emission and no noise pollution, which meets the requirements of green construction. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the hydraulic cutting device for external wall waterstop screws provided in an embodiment of the present invention.

[0050] In the diagram: 1. Housing; 2. Hydraulic cylinder; 3. Manual hydraulic pump; 4. Blade assembly; 5. Positioning sleeve; 6. Water-stop screw; 7. Limiting baffle; 8. Folding handle; 9. Water-stop screw for cutting off the innermost wall surface of the groove; 10. Piston rod; 11. Hydraulic oil circuit; 12. Oil filler port; 13. Heat dissipation copper base; 14. Extended guide sleeve; 15. Force-saving lever; 16. Water-stop wing ring on the water-stop screw; 17. Concrete exterior wall; 18. Concrete exterior wall surface; 19. Groove. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] like Figure 1 This invention provides a hydraulic cutting device for external wall water-stop screws, comprising a housing 1, a handle located outside the housing 1, a blade assembly 4 for cutting the water-stop screw, a positioning sleeve 5 sleeved on the water-stop screw and pressed against the innermost side wall of the groove, and a limiting baffle 7 conforming to the concrete external wall surface. The housing 1 contains a hydraulic cylinder 2 and a manual hydraulic pump 3. The manual hydraulic pump 3 is connected to the hydraulic cylinder 2 via a hydraulic oil circuit 11. The hydraulic cylinder 2 contains a reset elastic element. One end of the reset elastic element abuts against the piston inside the hydraulic cylinder 2, and the other end abuts against the end wall of the hydraulic cylinder 2 where the piston rod extends. The blade assembly 4 is detachably connected to the piston rod of the hydraulic cylinder 2. The positioning sleeve 5 and the limiting baffle 7 are both detachably connected to the same side of the housing 1. The limiting baffle 7 has a through hole for the positioning sleeve 5 to pass through, and the positioning sleeve 5 is clearance-fitted with the through hole. The handle is connected to the drive end of the manual hydraulic pump 3. In this embodiment, the reset elastic element is a reset spring, which is sleeved on the piston rod of the hydraulic cylinder 2. In this embodiment, the handle is connected to the drive end of the manual hydraulic pump 3 via a lever. The folding handle 8 is hinged to the lever 15, which is connected to the drive end of the manual hydraulic pump 3 via a hinge pin. In this embodiment, the housing 1 is provided with a filler port 12 that communicates with the oil storage chamber inside the manual hydraulic pump 3.

[0054] In this embodiment, the blade assembly 4 includes a blade body, with a blade on each of its opposite sides. Each blade has a cutting edge to facilitate cutting the water-stop screw. The blade body is snap-fitted to the end of the piston rod 10. A heat-dissipating copper base 13 is fixed to the non-shearing surface of the blade assembly 4. The heat-dissipating copper base 13 is brazed to the back of the blade of the blade assembly 4 to continuously dissipate cutting heat.

[0055] In this embodiment, the hydraulic cutting device for the external wall waterstop screw also includes an extended guide sleeve 14 for extending the positioning sleeve 5. The extended guide sleeve 14 is coaxial with the positioning sleeve 5 and detachably connected. In this embodiment, the limiting baffle 7 and the housing 1 are connected by bolts (extended screws). Both the housing 1 and the extended guide sleeve 14 are threadedly connected to the positioning sleeve 5.

[0056] Specifically, in this embodiment, the housing 1 is made of high-strength aluminum alloy with a wall thickness of 4mm, external dimensions of 90mm×150mm×55mm, and an overall weight controlled within 2.8kg. The housing 1 contains a hydraulic cylinder 2 mounting cavity, a manual hydraulic pump 3 mounting cavity, and an oil passage. The hydraulic cylinder 2 is a double-acting hydraulic cylinder with an inner diameter of φ28mm, a stroke of 35mm, a rated thrust of 15kN, and a maximum working pressure of 25MPa. A return spring is installed inside the hydraulic cylinder; one end of the return spring abuts against the piston inside the hydraulic cylinder 2, and the other end abuts against the end wall of the hydraulic cylinder 2 where the piston rod extends. When the hydraulic oil is depressurized, the spring pushes the piston to automatically return to its original position. The manual hydraulic pump 3 is integrated into the housing 1 and driven by a folding handle 8. The output force is amplified through a lever 15 with a lever ratio ≥1:8, and a maximum working pressure of 25MPa. Each press of the folding handle 8 pumps approximately 0.5mL, at a pressing frequency of 20-30 times / minute, the rated working pressure can be established in about 60 seconds; the blade assembly 4 is made of cemented carbide YG8 material, with a cutting angle of 30°, a double-edged reversible structure, which can be flipped over for use after one side is worn. Each set of blades can cut about 300 screws. The back of the blade integrates a heat dissipation copper base 13, which is 2mm thick and has an area of ​​30mm×15mm; the 30° cutting angle at the front end of the blade generates a shearing component force from the thrust, converting the horizontal thrust into a vertical shearing force, thereby cutting off the water-stopping screw 6; the blade assembly 4 and the piston rod are connected by a snap-fit, which can be replaced by hand; the positioning sleeve 5 is standardly equipped. Available in φ14mm and φ16mm sizes, with φ12mm and φ18mm optional sizes. The positioning sleeve 5 is 60mm long, with specification markings engraved on the outer wall and hard chrome plated on the inner wall to reduce friction with the screw. The positioning sleeve 5 is threaded to the housing 1 for easy assembly and disassembly. The extended guide sleeve 14 comes in two lengths, 30mm and 40mm, to accommodate construction scenarios with template cavity depths of 15-25mm. The return spring is a compression spring that automatically pushes the piston rod 10 and blade assembly 4 back to their original positions. The limiting baffle 7 is a 3mm thick stainless steel plate with a central opening for the positioning sleeve 5 to pass through. The hole, conforming to the concrete wall surface as a positioning reference, ensures precise cutting position of the blade; the limiting baffle 7 is fixed to the front end of the housing 1 by bolts; the blade passes through the positioning sleeve 5 and extends into the conical groove 19, cutting the water-stop screw 6 tightly against the wall surface at the deepest point of the groove 19, ensuring the cut does not protrude from the wall surface; the folding handle 8 has an unfolded length of 420mm and a folded length of 260mm for easy carrying; the folding handle 8 is connected to the rear end of the force-saving lever 15 via a hinge, and the hinge is equipped with a locking device to prevent the handle from accidentally folding during operation; the sealing rings include two types: polyurethane Y-shaped sealing rings and dustproof sealing rings, with the polyurethane Y-shaped sealing rings installed in the hydraulic cylinder 2. On the piston, a dustproof sealing ring is installed in the sealing groove of the end cap of the hydraulic cylinder 2, with a pressure resistance of 25MPa and an operating temperature of -20℃ to +80℃. The piston rod 10 connects the hydraulic cylinder 2 and the blade assembly 4, transmitting hydraulic thrust. The hydraulic oil circuit 11 connects the manual hydraulic pump 3 and the hydraulic cylinder 2, and is equipped with a check valve and a relief valve. The check valve ensures unidirectional flow of hydraulic oil, and the relief valve automatically relieves pressure when the pressure exceeds 25MPa, protecting system safety. The manual hydraulic pump 3 has a built-in oil reservoir, which is replenished with oil through the oil filler port 12. The oil filler port 12 is located on the side of the housing 1 and is equipped with a sealing plug for replenishing hydraulic oil (ISO VG46). The labor-saving lever 15 is a labor-saving lever mechanism integrated into the front end of the folding handle 8, amplifying the pressure of the handle by more than 8 times and transmitting it to the manual hydraulic pump 3, significantly reducing the operator's labor intensity. The heat dissipation copper base 13 is made of copper, with a thickness of 2mm and an area of ​​30mm × 15mm, and is brazed and fixed to the back of the blade of the blade assembly 4, continuously dissipating cutting heat.

[0057] In this embodiment, the limiting baffle 7 has a through hole in the middle, through which the positioning sleeve 5 passes. The positioning sleeve 5 is clearance-fitted with the through hole, which restricts the radial movement of the positioning sleeve 5. The front end of the positioning sleeve 5 extends into the groove 19 of the concrete outer wall 17, and the end abuts against the inner wall of the deepest part of the groove, thus providing axial positioning. The limiting baffle 7 abuts against the concrete outer wall surface 18. The cooperation between the two allows the blade to accurately reach the cutting position. The diameter of the positioning sleeve 5 is selected according to the diameter of the water-stop screw 6 and the size of the blade; that is, the diameter of the positioning sleeve 5 should be adapted to the diameter of the water-stop screw 6 and accommodate the blade to pass through.

[0058] Before construction, select a positioning sleeve 5 of the corresponding specification according to the diameter of the water-stop screw 6. The positioning sleeve 5 is installed to the front end of the housing 1 by thread. If the exposed wall of the water-stop screw 6 is too long, add an extension guide sleeve 14 to the end of the positioning sleeve 5 away from the housing 1 to extend the length of the positioning sleeve 5. The extension guide sleeve 14 is threadedly connected to the positioning sleeve 5.

[0059] The blade assembly 4 includes a blade body and two blades installed at both ends of the blade body. One end is the main blade (working blade), and the other end is the spare blade. After the main blade wears out, the blade assembly 4 can be disassembled and flipped over to use the spare blade to cut the water-stop screw 6.

[0060] The blade assembly 4 is installed at the end of the piston rod 10 and extends along the horizontal axis with the piston rod 10. The front end of the blade is provided with a cutting angle (30°). When the blade moves to the cutting position along the outside of the water-stop screw 6, the cutting angle converts the horizontal thrust of the piston rod into a shearing force perpendicular to the axial direction of the water-stop screw 6, thereby achieving vertical cutting.

[0061] The blade assembly 4 passes sequentially through the positioning sleeve 5 and the extended guide sleeve 14, extending into the groove 19 to reach the root of the water-stop screw 6 for cutting, with the cut located within the groove 19. When the blade cuts the water-stop screw 6, it presses the water-stop screw 6 against the inner wall of the positioning sleeve 5, forming a stable shearing condition. The heat dissipation copper base 13 is a copper block fixed on the non-shearing surface of the blade assembly 4, serving a heat dissipation function.

[0062] Embodiment 2 of the present invention provides an installation method for a hydraulic cutting device for external wall waterstop bolts, comprising the following steps:

[0063] S1. Insert the return spring into the piston rod 10 and install it into the hydraulic cylinder 2, so that one end of the return elastic element abuts against the piston in the hydraulic cylinder 2, and the other end of the return elastic element abuts against the end wall of the hydraulic cylinder 2 where the piston rod extends.

[0064] S2. Install the Y-shaped sealing ring in the piston sealing groove of the hydraulic cylinder 2, and install the dustproof sealing ring in the end cover sealing groove of the hydraulic cylinder 2.

[0065] S3. Fix the heat dissipation copper base 13 to the back of the blade of the blade assembly 4 by brazing, and then fix the blade body of the blade assembly 4 to the front end of the piston rod 10 by snap-fit ​​connection, and confirm that the snap-fit ​​is locked in place.

[0066] S4. Install the hydraulic cylinder 2 into the housing 1, so that the piston rod 10 and the blade assembly 4 extend out from the front opening of the housing 1, and fix the end cap of the hydraulic cylinder with bolts.

[0067] S5. Install the manual hydraulic pump 3 inside the housing 1, connect the hydraulic oil circuit 11 to the manual hydraulic pump 3 and the hydraulic cylinder 2, and confirm that there is no leakage at each joint.

[0068] S6. The limiting baffle 7 is fixed to the front end of the housing 1 by bolts (extended screws), so that the plane of the limiting baffle 7 is perpendicular to the movement direction of the blade assembly 4, the center hole of the limiting baffle 7 is aligned with the movement axis of the blade, and the bolts are tightened.

[0069] S7. Connect the positioning sleeve 5 to the front end of the housing 1 by thread, so that the positioning sleeve 5 is coaxial with the movement direction of the blade assembly 4, and make the blade assembly 4 and the heat dissipation copper base 13 extend into the positioning sleeve 5, that is, the blade assembly 4 and the heat dissipation copper base 13 are initially located in the positioning sleeve 5, and tighten the positioning sleeve 5 into place; depending on the construction needs, choose whether to add an extension guide sleeve 14 to the positioning sleeve 5 to extend it.

[0070] S8. Integrate the labor-saving lever 15 into the front end of the folding handle 8. The folding handle 8 is hinged to the labor-saving lever 15. The labor-saving lever 15 is connected to the drive end of the manual hydraulic pump 3 through the hinge shaft. Lock the hinge shaft locking device.

[0071] S9. Inject hydraulic oil ISO VG46 into the manual hydraulic pump 3 through the filler port 12, press the handle repeatedly to expel air from the hydraulic oil circuit 11, and complete the assembly of the device.

[0072] Embodiment 3 of the present invention provides a method for using an external wall water-stop screw hydraulic cutting device, comprising the following steps:

[0073] S1. Before construction, select the corresponding specification of positioning sleeve 5 according to the diameter of the water-stop screw 6. The positioning sleeve 5 is installed to the front end of the housing 1 by thread. If the depth of the groove 19 of the concrete outer wall 17 is greater than 15mm, add an extension guide sleeve 14 to the positioning sleeve 5 to extend the length of the positioning sleeve 5.

[0074] S2. Remove the plastic plug from the exposed end of the water-stop screw rod 6 on the concrete exterior wall 17. No tools are needed; simply pry it off by hand or with a screwdriver.

[0075] S3. Insert the positioning sleeve 5 and the extended guide sleeve 14 into the exposed water-stopping screw 6, and push the device to make the limit baffle 7 completely fit the concrete outer wall surface 18, and confirm that the fit is tight.

[0076] S4. Manually press the folding handle 8 repeatedly to amplify the pressing force through the labor-saving lever 15, drive the manual hydraulic pump 3 to press the hydraulic oil into the hydraulic cylinder 2 through the hydraulic oil circuit 11, and the hydraulic oil pushes the piston to drive the piston rod 10 and the blade assembly 4 to extend outward. The pressing frequency of the folding handle 8 should be controlled at 20 to 30 times per minute to apply pressure evenly and avoid impact.

[0077] S5, the blade of the blade assembly 4 is pressed against the water-stop screw 6 under the action of hydraulic thrust, generating a shearing effect, cutting the water-stop screw 6 against the wall at the deepest part of the groove, so that the water-stop screw 6 protrudes from the wall surface by no more than 1mm; the heat dissipation copper base 13 continuously dissipates the heat of the blade to prevent the blade from overheating during continuous operation.

[0078] S6. Release the folding handle 8, and the reset spring will push the piston rod 10 and the blade assembly 4 to automatically return to their original positions.

[0079] S7. Remove the positioning sleeve 5 and the extended guide sleeve 14 from the housing 1, move the device to the next water-stop screw 6, and repeat steps S3 to S6.

[0080] S8. After every 500 screws are cut, add hydraulic oil ISO VG46 to the manual hydraulic pump 3 through the oil filler port 12. After every 10 screws are cut, check the cut quality to confirm that there are no obvious burrs or protrusions. When the blade at one end of the blade assembly 4 is worn, it can be flipped over and the blade at the other end can be used. When both ends of the blade are worn, replace the blade assembly 4 with a new one.

[0081] In this embodiment, the length of the positioning sleeve 5 and the position of the limiting baffle 7 together determine the extension amount of the blade, thereby precisely controlling the length of the water-stop screw 6 protruding from the wall surface to be ≤1mm.

[0082] In another embodiment, the positioning sleeve 5 can adopt a split structure, that is, the positioning sleeve 5 is composed of a cylinder and a connecting section, and the cylinder and the connecting section are connected by threads, which makes it easy to select cylinders of different lengths according to the groove depth.

[0083] This invention provides a hydraulic cutting device for external wall water-stop screws. The device is based on manual hydraulic transmission. The positioning sleeve 5 is quickly inserted into the water-stop screw 6. The limiting baffle 7 is attached to the concrete wall surface as a cutting reference surface, and the carbide blade is driven to achieve the flat cutting of the exposed water-stop screw.

[0084] Insert the positioning sleeve 5 into the exposed water-stop screw 6, push the hydraulic cutting device to make the limit baffle 7 fit against the concrete wall 18, manually press the folding handle 8 repeatedly to drive the manual hydraulic pump 3, the hydraulic oil pushes the piston to drive the blade assembly 4 to extend outward, the blade cuts the water-stop screw 6 under the action of hydraulic thrust, and cuts against the wall at the deepest part of the groove 19; after releasing the folding handle 8, the reset spring pushes the piston and blade assembly 4 to automatically return to their original positions. In this invention, the positioning sleeve 5 and the limiting baffle 7 work together to achieve the function of "cutting deep into the groove against the wall". The limiting baffle 7 fits against the concrete outer wall surface 18 as a positioning reference. The blade passes through the limiting baffle 7 and extends into the conical groove 19 to cut at the deepest part of the groove, ensuring that the cut is flat and does not protrude more than 1mm from the wall surface. It adopts a labor-saving lever handle (lever ratio ≥1:8), which amplifies the output force by more than 8 times with a single press. The blade assembly integrates a copper-based heat dissipation structure, preventing the blade from sticking during continuous operation. The hydraulic cylinder is optimized with a small diameter of φ28mm, which can output 15kN shearing force at 25MPa. The lightweight design of the whole machine makes it easy to carry and operate. This device does not require power or open flame, eliminating the risk of fire, explosion and electric shock. The single cutting time is about 2.5 minutes, which is more than 170% more efficient than the traditional method. It can be reused and is suitable for cutting the exposed ends of water-stop screws in various concrete walls with waterproof requirements.

[0085] This invention is applicable to the cutting of exposed ends of water-stop screws in concrete structures with seepage prevention requirements, such as basement exterior walls, kitchens and bathrooms, and water tanks.

[0086] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic cutting device for external wall waterstop screws, characterized in that: The device includes a housing, a handle located outside the housing, a blade assembly for cutting a water-stop screw, a positioning sleeve fitted onto the water-stop screw and pressed against the innermost wall of the groove, and a limiting baffle that conforms to the concrete exterior wall. The housing contains a hydraulic cylinder and a manual hydraulic pump. The manual hydraulic pump is connected to the hydraulic cylinder via a hydraulic oil circuit. The hydraulic cylinder contains a reset elastic element, one end of which abuts against a piston inside the hydraulic cylinder, and the other end of which abuts against the end wall of the hydraulic cylinder where the piston rod extends. The blade assembly is detachably connected to the piston rod of the hydraulic cylinder. The positioning sleeve and the limiting baffle are both detachably connected to the same side of the housing. The limiting baffle has a through hole through which the positioning sleeve passes, and the positioning sleeve is clearance-fitted to the through hole. The handle is connected to the drive end of the manual hydraulic pump.

2. The hydraulic cutting device for external wall waterstop screws as described in claim 1, characterized in that: The reset elastic element is a reset spring, which is sleeved on the piston rod of the hydraulic cylinder.

3. The hydraulic cutting device for external wall waterstop bolts as described in claim 1, characterized in that: The blade assembly includes a blade body, with a blade on each of the opposite sides of the blade body. The blades are provided with cutting edges to facilitate cutting the water-stop screw. The blade body is snap-fitted to the end of the piston rod.

4. The hydraulic cutting device for external wall waterstop bolts as described in claim 1, characterized in that: A heat-dissipating copper base is fixed on the non-shearing surface of the blade assembly.

5. The hydraulic cutting device for external wall waterstop bolts as described in claim 1, characterized in that: The hydraulic cutting device for water-stopping screws on external walls also includes an extended guide sleeve for extending the positioning sleeve, the extended guide sleeve being coaxial with the positioning sleeve and detachably connected.

6. The hydraulic cutting device for external wall waterstop bolts as described in claim 5, characterized in that: Both the housing and the extended guide sleeve are threadedly connected to the positioning sleeve.

7. The hydraulic cutting device for external wall waterstop bolts as described in claim 1, characterized in that: The limiting baffle and the housing are connected by bolts.

8. The hydraulic cutting device for external wall waterstop bolts as described in claim 1, characterized in that: The handle is connected to the drive end of the manual hydraulic pump via a lever.

9. An installation method for a hydraulic cutting device for external wall waterstop bolts, comprising the following steps: S1. Insert the reset elastic element into the piston rod and install it into the hydraulic cylinder, so that one end of the reset elastic element abuts against the piston inside the hydraulic cylinder, and the other end of the reset elastic element abuts against the end wall of the hydraulic cylinder where the piston rod extends. S2. Secure the blade assembly to the front end of the piston rod; S3. Install the hydraulic cylinder into the housing, so that the piston rod and blade assembly protrude from the front opening of the housing, and then fix the end cap of the hydraulic cylinder. S4. Install the manual hydraulic pump inside the housing. The manual hydraulic pump is connected to the hydraulic cylinder through the hydraulic oil circuit. S5. The limiting baffle is fixed at the front end of the housing, so that the plane of the limiting baffle is perpendicular to the movement direction of the blade assembly, and the center hole of the limiting baffle is aligned with the movement axis of the blade. S6. Fix the positioning sleeve to the front end of the housing, making the positioning sleeve coaxial with the movement direction of the blade assembly, and make the blade assembly and the heat dissipation copper base extend into the positioning sleeve; depending on the construction needs, choose whether to add an extension guide sleeve to the positioning sleeve for extension. S7. The handle is hinged to the lever, and the lever is connected to the drive end of the manual hydraulic pump via a hinge pin. S8. Inject hydraulic oil into the manual hydraulic pump through the filler port, press the handle repeatedly to expel air from the hydraulic oil circuit, and complete the assembly of the device.

10. A method of using a hydraulic cutting device for exterior wall waterstop bolts, comprising the following steps: S1. Before construction, select the corresponding specification of positioning sleeve according to the diameter of the water-stop screw, and install the positioning sleeve to the front end of the shell; if the groove depth of the concrete exterior wall is greater than 15mm, add an extension guide sleeve to the positioning sleeve to extend the length of the positioning sleeve. S2. Remove the plastic plug from the exposed end of the water-stop bolt on the concrete exterior wall; S3. Insert the positioning sleeve and the extended guide sleeve into the exposed water-stop screw rod, and push the device to make the limit baffle completely fit the concrete exterior wall surface. S4. Manually press the handle repeatedly to amplify the pressing force through the labor-saving lever, drive the manual hydraulic pump to press hydraulic oil into the hydraulic cylinder through the hydraulic oil circuit, and the hydraulic oil pushes the piston to drive the piston rod and blade assembly to extend outward. S5. The blade assembly passes through the positioning sleeve and the extended guide sleeve in sequence. Under the action of hydraulic thrust, the blade presses against the water-stop screw, generating a shearing effect and cutting the water-stop screw against the wall at the deepest part of the groove. S6. Release the handle, and the reset elastic element will push the piston rod and blade assembly to automatically return to their original positions; S7. Remove the positioning sleeve and extended guide sleeve from the housing, move the device to the next water-stop screw, and repeat steps S3 to S6.

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