Static blasting anti-punching device and construction method

Abstract

The invention provides a static blasting anti-punching device and a construction method, the static blasting anti-punching device comprises a sealing cover, a liquid injection pipe, a plurality of telescopic mechanisms and a plugging cap, the liquid injection pipe is vertically arranged and used for extending into a drill hole and injecting crushing agent slurry into the drill hole, and the sealing cover is arranged at the upper end of the liquid injection pipe and can plug the drill hole. The multiple telescopic mechanisms are arranged in the circumferential direction of the liquid injection pipe, and top plates of the telescopic mechanisms are used for being attached to the inner wall of the drill hole. Due to the fact that the sealing cover, the liquid injection pipe and the telescopic mechanism are connected into a whole, when crushing agent slurry expands, the top plate can be pushed to apply extrusion force to the inner wall of a drill hole, the friction force between the top plate and the inner wall of the drill hole is increased accordingly, upward impact force borne by the sealing cover can be offset, and the function of preventing punching is achieved.

Description

Technical Field

[0001] This invention belongs to the field of static blasting technology, specifically relating to a static blasting anti-burr hole device and construction method. Background Technology

[0002] In densely populated areas such as towns and cities, when encountering foundation pits or concrete that require fracturing, explosive blasting cannot be used; only static blasting can be employed. Static blasting involves drilling holes in the rock and filling them with a fracturing agent. The agent hydrates and expands, applying stress from within the rock, causing it to fracture. Static blasting offers advantages such as low noise, low dust, low vibration, and ease of implementation.

[0003] The effectiveness and speed of static blasting are related to the borehole diameter and the amount of fracturing agent used. To improve the fracturing effect and speed up the construction process, static blasting typically uses a large borehole diameter of 5-10 cm and a larger amount of fracturing agent. However, using large-diameter static fracturing agents can lead to perforation. Perforation refers to the phenomenon where the fracturing agent is ejected from the borehole when the internal pressure reaches a certain level. Perforation reduces the expansion pressure generated by the fracturing agent, affecting the effectiveness of static blasting and even causing blasting failure. Summary of the Invention

[0004] This invention provides a static blasting anti-burr-burr device and construction method, aiming to solve the problem that burr-burr phenomenon occurs during static blasting in the prior art, which reduces the expansion pressure generated by the fracturing agent, affects the effect of static blasting, and may even lead to blasting failure.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a static blasting anti-blowout device, comprising: The cap is round. The injection tube is vertically arranged, with its upper end penetrating the cap and forming an inlet. The portion of the injection tube located below the cap has an outlet. Multiple telescopic mechanisms are located below the cap and evenly distributed along the circumference of the injection tube. Each telescopic mechanism includes a sleeve, a sliding rod, and a top plate. One end of the sleeve is connected to the injection tube, and the other end extends radially along the injection tube. One end of the sliding rod is slidably disposed within the sleeve, and the other end is connected to the top plate. The top plate is an arc-shaped plate, and the sidewall of the arc-shaped plate is designed to fit against the inner wall of the borehole. A sealing cap is detachably mounted on the upper end of the injection tube to seal the inlet.

[0006] In one possible implementation, the telescopic mechanism further includes an elastic element disposed within the sleeve, the slide rod abutting against the elastic element, and the elastic element being configured with a preload to move the slide rod away from the injection tube.

[0007] In one possible implementation, the injection tube has multiple outlets along its length.

[0008] In one possible implementation, multiple telescopic mechanisms are provided at intervals along the length of the injection tube.

[0009] In one possible implementation, the sealing cap is threaded to the upper end of the injection tube.

[0010] In one possible implementation, the upper end of the injection tube is provided with an annular retaining ring, the cap has a clearance hole for the injection tube to pass through, the lower surface of the cap abuts against the retaining ring, and the lower end of the sealing cap abuts against the upper surface of the cap.

[0011] In one possible implementation, the upper surface of the retaining ring is provided with a sealing groove surrounding the injection tube, and an annular sealing ring is provided in the sealing groove.

[0012] In one possible implementation, the top plate has anti-slip textures on the side that is used to fit against the inner wall of the borehole.

[0013] In one possible implementation, four telescopic mechanisms are provided along the circumference of the injection tube, and the arc angle of the arc plate is 90°.

[0014] Compared with the prior art, the beneficial effects of the static blasting anti-burr hole device provided by the present invention are: The static blasting anti-blowout device provided by this invention includes a cap, an injection pipe, multiple telescopic mechanisms, and a sealing cap. The injection pipe is vertically arranged and is used to extend into the borehole to inject fracturing agent slurry into the borehole. The cap is located at the upper end of the injection pipe and can seal the borehole. The multiple telescopic mechanisms are arranged along the circumference of the injection pipe, and the top plate of the telescopic mechanism is used to fit against the inner wall of the borehole. Since the cap, injection pipe, and telescopic mechanisms are connected as a whole, when the fracturing agent slurry expands, it can push the top plate to apply a compressive force to the inner wall of the borehole. The friction between the top plate and the inner wall of the borehole increases accordingly, which can counteract the upward impact force on the cap and play the role of preventing blowout.

[0015] In a second aspect, the present invention provides a static blasting anti-blowout hole construction method, employing a static blasting anti-blowout hole device according to any of the above-described implementation methods, comprising the following steps: Select the appropriate type of fracturing agent based on the construction environment and the object being constructed, and determine the hole spacing, diameter, and depth. Drill holes in the construction object according to the construction requirements; Select a static blasting anti-blowout device that corresponds to the borehole diameter, and install the static blasting anti-blowout device into the borehole. The fracturing agent is delivered into the borehole through the inlet; After the fracturing agent is delivered, the inlet is sealed with a sealing cap.

[0016] The present invention provides a static blasting anti-blowout hole construction method, which adopts any of the above-mentioned implementation methods of a static blasting anti-blowout hole device and has the same technical effect, and will not be described in detail here. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a static blasting anti-burr hole device provided in one embodiment of the present invention; Figure 2 This is an internal cross-sectional view of a static blasting anti-burst hole device provided in one embodiment of the present invention; Figure 3 for Figure 2 A magnified view of part A in the middle.

[0018] Explanation of reference numerals in the attached figures: 10. Cap; 20. Injection tube; 21. Inlet; 22. Outlet; 23. Retaining ring; 30. Telescopic mechanism; 31. Sleeve; 32. Slide rod; 33. Top plate; 34. Elastic element; 40. Sealing cap. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0020] Please refer to the following: Figures 1 to 3 The following describes a static blasting anti-burr hole device and a static blasting anti-burr hole method provided by embodiments of the present invention.

[0021] When static blasting is carried out at high ambient temperatures, the hydration reaction of the fracturing agent is intense, and a large amount of heat can be released in a short time. The internal temperature of the fracturing agent rises rapidly to over 100°C. The internal water vaporizes at high temperature, generating high-pressure water vapor. When the pressure reaches a certain level, the water vapor will carry the fracturing agent slurry out of the borehole, resulting in a blowout phenomenon. This phenomenon reduces the expansion pressure generated by the fracturing agent, affecting the effect of static blasting, and may even lead to blasting failure. Sealing the borehole after the fracturing agent is filled can effectively improve the blasting effect. The currently disclosed anti-blowout technologies mainly include: (1) installing rivets outside the hole and covering the top of the borehole with a hole cover. The hole cover is fixed by rivets to seal the borehole and achieve anti-blowout. (2) excavating a narrow-at-the-top and wide-at-the-bottom irregular hole at the borehole opening and using a wedge to seal it to prevent blowout. (3) using a low-temperature physical method at the borehole opening to reduce the heat of hydration of the fracturing agent to prevent blowout, etc.

[0022] All three methods for preventing hole punching have some effect, but in practical applications, method (1) requires rivets around the hole opening, which is relatively complicated and has low installation efficiency. Method (2) requires machining the hole opening into an irregular shape, which is difficult to process, costly, and inefficient. Method (3) uses a low-temperature physical method to cool the hole opening, which is difficult to implement and will affect the hydration reaction of the breaking agent near the hole opening, making it not worthwhile. Therefore, it is necessary to invent a simple and quick hole sealing device with anti-hole punching function.

[0023] Please see Figure 1 , Figure 2 and Figure 3 In a first aspect, embodiments of the present invention provide a static blasting anti-burst device, including a cap 10, an injection pipe 20, multiple telescopic mechanisms 30, and a sealing cap 40. The cap 10 is circular; the injection tube 20 is vertically arranged, with its upper end penetrating the cap 10 and forming an inlet 21. The portion of the injection tube 20 located below the cap 10 has an outlet 22; multiple telescopic mechanisms 30 are respectively arranged below the cap 10 and are evenly distributed along the circumference of the injection tube 20. Each telescopic mechanism 30 includes a sleeve 31, a slide rod 32, and a top plate 33. One end of the sleeve 31 is connected to the injection tube 20, and the other end extends radially along the injection tube 20. One end of the slide rod 32 is slidably disposed inside the sleeve 31, and the other end is connected to the top plate 33. The top plate 33 is an arc-shaped plate, and the sidewall of the arc-shaped plate is used to fit against the inner wall of the borehole; the sealing cap 40 is detachably disposed at the upper end of the injection tube 20 and is used to seal the inlet 21.

[0024] Compared with the prior art, the beneficial effects of the static blasting anti-burr hole device provided in the embodiments of the present invention are: This invention aims to address the problem of hole punching during static blasting by providing a simple, convenient, and effective anti-hole punching device. Specifically, the static blasting anti-hole punching device provided in this embodiment includes a cap 10, an injection pipe 20, multiple telescopic mechanisms 30, and a sealing cap 40. The injection pipe 20 is vertically positioned to extend into the borehole and inject fracturing agent slurry. The cap 10 is positioned at the upper end of the injection pipe 20 to seal the borehole. The multiple telescopic mechanisms 30 are arranged along the circumference of the injection pipe 20, and the top plate 33 of each telescopic mechanism 30 is designed to fit against the inner wall of the borehole. Since the cap 10, injection pipe 20, and telescopic mechanisms 30 are integrated, when the fracturing agent slurry expands, it pushes the top plate 33 to exert pressure on the inner wall of the borehole. The friction between the top plate 33 and the inner wall of the borehole increases accordingly, counteracting the upward impact force on the cap 10 and thus preventing hole punching.

[0025] The cap 10 is circular, and its shape and size are adapted to the shape and size of the borehole opening for sealing the borehole. The cap 10 can be made of steel plate, and its thickness can be 2mm, 3mm, etc. The injection pipe 20 can be a hollow steel pipe, and the injection pipe 20 and the cap 10 can be connected as a whole by welding, screws, or other methods. The side wall and bottom of the injection pipe 20 can be provided with outlet holes, and the top of the injection pipe 20 is used to connect to the fracturing agent slurry delivery device. The fracturing agent slurry enters the borehole through the outlet 22 to fill the borehole.

[0026] Multiple telescopic mechanisms 30 are evenly distributed along the circumference of the injection pipe 20 and can extend and retract synchronously. The injection pipe 20 is located at the axial position of the borehole. The telescopic mechanism 30 includes a sleeve 31, a slide rod 32, and a top plate 33. The sleeve 31 can be made of metal pipe, the slide rod 32 can be made of metal rod, and the top plate 33 is an arc-shaped plate with the same diameter as the borehole. The top plate 33 is used to fit against the inner wall of the borehole. The top plate 33 and the slide rod 32 can be connected as one piece by welding, screw connection, or other methods.

[0027] The top plate 33 is connected to the injection pipe 20 via a telescopic structure consisting of a slide rod 32 and a sleeve 31, allowing it to move perpendicular to the depth within the borehole. The top plate 33 adheres to the inner wall of the borehole. When a fracturing agent is injected into the borehole, the expansion force generated by the expanding fracturing agent pushes the top plate 33 towards the inner wall of the borehole, creating significant friction between the top plate 33 and the borehole interior. As long as this friction is greater than the force required to open the cap 10 by the fracturing agent, it achieves the technical effect of preventing borehole impact.

[0028] In this embodiment, the slide bar 32 is slidably disposed inside the sleeve 31. On the one hand, as the fracturing agent slurry gradually expands, it can radially compress the top plate 33, causing the slide bar 32 to move together with the top plate 33, ensuring that the top plate 33 always fits against the inner wall of the borehole. On the other hand, the extension diameter of the slide bar 32 is adjustable, which can adapt to boreholes of different diameters, such as 100mm, 150mm, etc.

[0029] To improve product versatility, the cap 10 and grouting pipe can be designed to be detachable. The grouting pipe and sleeve 31 can remain unchanged, while the cap 10, slide bar 32, and top plate 33 can be designed differently according to different borehole diameters. When it is necessary to match boreholes of different diameters, only the cap 10, slide bar 32, and top plate 33 of the corresponding size need to be replaced. Specifically, users can flexibly select the size and quantity of the top plate 33 according to the borehole diameter, depth, and amount of fracturing agent used.

[0030] The sealing cap 40 is used to seal the inlet 21 of the injection pipe 20 after grouting is completed. The sealing cap 40 can be in the form of a rubber stopper, threaded stopper, or nut. For ease of installation, the sealing cap 40 can be designed with an external hexagon, making it easy for operators to tighten and fix it with a wrench.

[0031] The static blasting anti-blowout device provided by this invention has a simple structure, is easy to operate, and has a good blasting effect. Furthermore, the number and size of the top plate 33 can be flexibly increased according to the actual situation, thereby effectively improving the construction effect of the blasting agent and having strong versatility.

[0032] Please see Figure 2 and Figure 3 In some possible embodiments, the telescopic mechanism 30 further includes an elastic element 34 disposed inside the sleeve 31, the slide rod 32 abutting against the elastic element 34, and the elastic element 34 is configured with a preload force that causes the slide rod 32 to move away from the injection tube 20.

[0033] In this embodiment, the telescopic mechanism 30 also includes an elastic element 34. The elastic element 34 can be a spring, rubber block, or other structural component capable of elastic deformation. The elastic element 34 is disposed inside the sleeve and is used to apply a preload force to the slide rod 32 to extend the slide rod 32 outward. By providing the elastic element 34, the top plate 33 can fit snugly against the drill hole when inserted, improving the accuracy of product installation.

[0034] Please see Figure 1 and Figure 2 In some possible embodiments, the injection pipe 20 has multiple outlets 22 along its length. The outlets 22 are located on the side wall of the injection pipe 20 and can be machined using a drilling machine. By setting multiple outlets from bottom to top, it helps to ensure that the fracturing agent is filled evenly.

[0035] Please see Figure 1 and Figure 2 In some possible embodiments, when the drilling depth is deep, multiple telescopic mechanisms 30 are provided at intervals along the length of the injection tube 20 to securely fix the cap 10 at the drilling position.

[0036] Please see Figure 2 In some possible embodiments, the sealing cap 40 is threaded to the upper end of the injection tube 20, and the threaded connection is firm and reliable, and convenient for installation and disassembly.

[0037] Please see Figure 2 In some possible embodiments, the upper end of the injection tube 20 is provided with an annular retaining ring 23, the cap 10 has a clearance hole for the injection tube 20 to pass through, the lower surface of the cap 10 abuts against the retaining ring 23, and the lower end of the sealing cap 40 abuts against the upper surface of the cap 10.

[0038] In this embodiment, the upper end of the injection tube 20 is provided with an annular retaining ring 23. The retaining ring 23 can be integrally formed with the injection tube 20, or it can be processed by screws, welding, or other methods. The function of the retaining ring 23 is to stop and limit the sealing cap 10. In this embodiment, the sealing cap 10 has a circular clearance hole, the shape and size of which are adapted to the injection tube 20, and the sealing cap 10 and the injection tube 20 are detachably connected.

[0039] During installation, firstly, insert multiple sliding rods 32 with top plates 33 one by one into the corresponding sleeves. Then, adjust the sliding rods 32 to match the diameter of the borehole. Lower the injection pipe 20, the top plates 33, and the sliding rods 32 together into the borehole. After the injection pipe 20 reaches the preset position, install the cap 10 onto the injection pipe 20, so that the lower surface of the cap 10 abuts against the upper surface of the retaining ring 23. Then, connect the inlet 21 to the grouting agent injection equipment, which pumps grouting agent into the injection pipe 20. The grouting agent enters the borehole from the outlet 22, gradually filling the borehole. After the cracking agent slurry is injected, remove the cracking agent grouting equipment from the injection pipe 20, install the sealing cap 40 onto the injection pipe 20 to seal the inlet 21, and at the same time press the sealing cap 40 down to tighten the sealing cover 10, connecting the sealing cover 10 and the injection pipe 20 into one unit.

[0040] This embodiment designs the cap 10 as detachable and sets a retaining ring 23 on the injection tube 20 to stop and limit the cap 10, so that the operator can replace the cap 10 with the corresponding diameter according to different drilling sizes, thereby improving the versatility and adaptability of the product.

[0041] In the above embodiments, since the cap 10 and the injection tube 20 are detachably connected, the advantage is that the cap 10 can be replaced. The disadvantage is that the gap between the cap 10 and the sleeve 31 has poor sealing, which can easily lead to air leakage or leakage of the breaking agent. To solve this problem, please refer to... Figure 2 In some possible embodiments, the upper surface of the retaining ring 23 is provided with a sealing groove surrounding the injection tube 20, and an annular sealing ring is provided in the sealing groove.

[0042] In this embodiment, the retaining ring 23 is used on the side that fits against the cover 10. Specifically, an annular sealing groove is formed on the upper surface of the retaining ring 23, and a high-temperature resistant silicone sealing ring is placed inside the sealing groove. After installation, the cover 10 can apply a downward pressing force to the sealing ring, ensuring a tight seal between the cover 10 and the retaining ring 23. One or more sealing grooves can be provided as needed, with different diameters for each groove, and each groove can contain one sealing ring.

[0043] In some possible embodiments, to increase the friction between the top plate 33 and the inner wall of the borehole, the side of the top plate 33 that is in contact with the inner wall of the borehole is provided with anti-slip texture. This increases the friction between the top plate 33 and the inner wall of the borehole, thereby improving the anti-blowout effect. The shape of the anti-slip texture is not limited; it can be a mesh pattern, or it can be raised dots, pits, or other textures, as long as it can increase the friction.

[0044] In some possible embodiments, multiple telescopic mechanisms 30 are provided along the circumference of the injection tube 20, specifically two, three, four or more, and the arc angle of the arc plate can be 30°, 60°, 90°, 100°, etc. When the height of the arc plate is constant, the larger the angle of the arc plate, the larger its area, and the better the anti-punch effect of the product.

[0045] In a second aspect, the present invention provides a static blasting anti-blowout drilling construction method, which is implemented using a static blasting anti-blowout drilling device in any of the above embodiments, and includes the following steps: selecting a suitable type of fracturing agent according to the construction environment and the construction object, and determining the hole spacing, hole diameter and depth; drilling holes on the construction object according to the construction requirements; selecting a static blasting anti-blowout drilling device corresponding to the hole diameter, and installing the static blasting anti-blowout drilling device into the hole; conveying fracturing agent into the hole through the inlet 21; after the fracturing agent is conveyed, sealing the inlet 21 with the sealing cap 40.

[0046] The following describes a static blasting anti-blowout hole construction method provided by the present invention with reference to a specific embodiment: First, determine the specifications and dimensions of the device based on the crushing design parameters.

[0047] In this embodiment, the rock to be broken is Yanshanian granite. The hole spacing is determined to be 40 cm, the row spacing to be 32 cm, the hole diameter to be 5 cm, and the hole depth to be 1 m. Therefore, a circular steel plate with a diameter of approximately 4.8 cm is selected for the cap 10, and a circular steel pipe with a diameter of 1.5 cm is selected for the injection pipe 20. A circular hole with a diameter of 1.5 cm is drilled at the center of the cap 10 to allow the injection pipe 20 to pass smoothly through the cap 10. The upper end of the injection pipe 20 extends 1.5 cm beyond the cap 10. The injection pipe 20 and the cap 10 can be fixedly connected by welding or by fasteners for disassembly. The injection pipe 20 and the cap 10 together form the main body of the anti-blowout device, which serves to seal the drill hole. The part of the injection pipe 20 extending beyond the cap 10 is connected to the crushing agent injection equipment through a delivery hose.

[0048] The side wall of the injection pipe 20 is provided with multiple outlets 22, each outlet 22 having a diameter of 0.8 cm. The distance between each pair of outlets is 10 cm, and a total of 9 outlets are arranged. The bottom of the injection pipe 20 can also be used to supply slurry outflow.

[0049] The telescopic mechanism 30 is provided in two sets, upper and lower, each set including four telescopic mechanisms 30 surrounding the injection pipe 20. The sleeve 31 of the telescopic mechanism 30 is welded to the grouting pipe as a whole, and the position of the sleeve 31 should avoid the outlet 22. The slide rod 32 is slidably set inside the sleeve 31, and an arc-shaped top plate 33 is welded to the end of the slide rod 32 that extends out of the sleeve 31. The top plate 33 is made of arc-shaped steel plate. The outer diameter of the top plate 33 is 5 cm, and the top plate 33 can fit against the inner wall of the borehole.

[0050] The telescopic mechanism 30 is configured in two sets, one at the bottom and one in the middle of the hole, forming different anchoring sections to improve anchoring efficiency and enhance the effectiveness of the fracturing agent. When grouting is performed after the anti-blowout device is fabricated, the following steps should be followed: (1) Grouting: Select a suitable fracturing agent according to the air temperature or working environment temperature during construction; in this embodiment, the construction working environment is 20 ℃~35 ℃, so Type I fracturing agent is selected; in this embodiment, the pore size is 5 cm, so the fracturing agent dosage is selected as 2.8 kg / m and the water-cement ratio is 0.33. Weigh the required fracturing agent, add water and mix to form fracturing agent slurry, and pour the slurry into the grouting equipment.

[0051] (2) Installation of anti-blowout device: Place the prepared anti-blowout device into the hole to be broken.

[0052] (3) Grouting equipment connection: Connect the top of the injection pipe 20 to the grouting equipment. One grouting equipment can connect multiple injection pipes 20 at one time; (4) Grouting: The grout in the grouting equipment is injected into the borehole by pressurization; the grout is injected from the top inlet 21 of the injection pipe 20 and flows out from the bottom port and outlet 22, eventually filling the borehole. This method fills the hole tightly and indirectly improves the crushing effect of the crushing agent.

[0053] (5) Sealing the pipe: After the grouting is completed, use the sealing cap 40 to seal the injection pipe 20.

[0054] After grouting has been completed for a period of time, the fracturing agent begins to hydrate and expand, pressing the top plate 33 against the inner wall of the borehole. This generates significant frictional resistance between the top plate 33 and the inner wall of the borehole. Simultaneously, the fracturing agent exerts an upward thrust on the cap 10, giving it a tendency to be ejected from the borehole. The frictional resistance generated by the top plate 33 and the thrust acting on the cap 10 cancel each other out, thus preventing the fracturing agent from being ejected from the borehole and suppressing the perforation effect.

[0055] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present invention specification has recorded each combined embodiment and can support different combined embodiments.

[0056] 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, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A static blasting anti-punching device, characterized in that: include: A cover (10) having a circular shape; A liquid injection pipe (20) is arranged vertically, the upper end of the liquid injection pipe (20) passes through the sealing cover (10) and is formed with a liquid inlet (21), and the portion of the liquid injection pipe (20) located below the sealing cover (10) is provided with a liquid outlet (22); A plurality of telescopic mechanisms (30) are arranged below the cover (10) and are evenly distributed along the circumferential direction of the injection tube (20). The telescopic mechanisms (30) include a sleeve (31), a slide rod (32) and a top plate (33). One end of the sleeve (31) is connected to the injection tube (20), and the other end extends radially along the injection tube (20). One end of the slide rod (32) is slidably arranged in the sleeve (31), and the other end is connected to the top plate (33). The top plate (33) is an arc-shaped plate, and the side wall of the arc-shaped plate is used to fit with the inner wall of the drilled hole. as well as A sealing cap (40) is detachably disposed on the upper end of the liquid injection tube (20) and is used to seal the liquid inlet (21).

2. A static blasting anti-punching device according to claim 1, characterized in that: The telescopic mechanism (30) further comprises an elastic member (34), wherein the elastic member (34) is disposed in the sleeve (31), the slide rod (32) abuts against the elastic member (34), and the elastic member (34) is provided with a pre-tightening force for causing the slide rod (32) to move in a direction away from the injection tube (20).

3. A static blasting anti-punching device according to claim 1, characterized in that: The liquid injection pipe (20) is provided with a plurality of liquid outlets (22) along its length direction.

4. A static blasting anti-punching device according to claim 1, characterized in that: A plurality of telescopic mechanisms (30) are arranged at intervals along the length direction of the liquid injection tube (20).

5. The static blasting anti-punching device according to claim 1, characterized in that: The blocking cap (40) is threadedly connected to the upper end of the liquid injection tube (20).

6. A static blasting anti-punching device according to claim 5, characterized in that: An annular retaining ring (23) is provided at the upper end of the liquid injection tube (20); the cover (10) has a relief hole for the liquid injection tube (20) to pass through; the lower surface of the cover (10) abuts against the retaining ring (23); and the lower end of the blocking cap (40) abuts against the upper surface of the cover (10).

7. A static blasting anti-punching device according to claim 6, characterized in that: The upper surface of the retaining ring (23) is provided with a sealing groove surrounding the liquid injection pipe (20), and an annular sealing ring is provided in the sealing groove.

8. The static blasting anti-punching device according to claim 1, characterized in that: The top plate (33) is provided with anti-slip patterns on one side thereof for contacting with the inner wall of the drill hole.

9. The static blasting anti-punching device according to claim 1, characterized in that: Four telescopic mechanisms (30) are provided along the circumferential direction of the liquid injection tube (20), and the arc angle of the arc plate is 90°.

10. A static blasting anti-punching construction method, characterized in that: The static blasting anti-punching device according to any one of claims 1 to 9 comprises the following steps: Select the appropriate type of crushing agent according to the construction environment and construction object, and determine the hole spacing, hole diameter and depth of the drilling hole; Drill holes on construction objects according to construction requirements; Selecting a static blasting anti-punch device corresponding to the borehole diameter, and installing the static blasting anti-punch device into the borehole; A crushing agent is delivered into the borehole through a liquid inlet (21); After the crushing agent is delivered, the liquid inlet (21) is blocked by the blocking cap (40).

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