Blasting tube for foundation reinforcement and method for reinforcing foundation through carbon dioxide blasting

Abstract

The invention provides a blasting tube for foundation reinforcement and a method for reinforcing a foundation through carbon dioxide blasting, the blasting tube comprises a tube body with two closed ends, a liquid storage tank is arranged in the tube body, and an air leakage head is arranged at one end of the tube body. The air leakage plate is provided with a plurality of air leakage holes communicated with the interior of the air leakage head. The method has the beneficial effects of being high in safety, environmentally friendly, low in cost, high in efficiency and good in soil body reinforcing effect.

Description

Technical Field

[0001] The invention relates to the field of engineering construction, in particular to a blasting tube for foundation reinforcement and a method for reinforcing the foundation by carbon dioxide blasting. Background Art

[0002] Since the 1990s, civil engineering construction has developed rapidly. The requirements of various buildings and structures for foundations have become prominent, mainly stability problems, deformation problems and permeability problems. When the natural foundation cannot meet the requirements of the building (structure) in the above three aspects, the natural foundation needs to be treated. According to the experimental research and engineering practice in the past four decades, the dynamic tamping method is more effective in strengthening the foundation. Dynamic tamping construction is a rapid consolidation method of the foundation that quickly compacts the foundation with a heavy hammer to improve the bearing capacity of the soft foundation. The defects of traditional dynamic tamping technology are: traditional dynamic tamping technology usually only considers the treatment of 6-8 meters. If the treatment depth needs to be increased, the method of increasing the hammer energy, increasing the hammer weight and increasing the height of the tamping hammer is often adopted. This not only increases the safety risk sharply, reduces the construction efficiency, and increases the construction cost, but also the guarantee rate of the traditional dynamic tamping treatment effect will be greatly reduced as the depth increases. Summary of the invention

[0003] The concept of the present invention is to use carbon dioxide blasting technology, arrange blasting points by drilling at boundary points under the strong compaction treatment depth, and use the explosion to produce compaction and vibration to reinforce the soil. The traditional carbon dioxide blasting tube is modified so that the blasting force is mainly directed to the soil below the blasting tube, thereby reinforcing the soil. By arranging release tubes, semicircular vents, venting holes, explosion time, explosion energy, explosion range and other methods, effective blasting of foundation treatment at fixed points and in fixed quantities is achieved.

[0004] Principle of carbon dioxide blasting: carbon dioxide gas can be transformed into liquid under a certain high pressure. Liquid carbon dioxide is compressed into a cylindrical container (blasting tube) through a high-pressure pump, and rupture discs, heat-conducting rods and sealing rings are loaded. The alloy cap is tightened to complete the preparations before blasting; the blasting tube, the safety cloud milli-difference initiator and the power cord are brought to the blasting site, the blasting tube is inserted into the drilled hole and fixed, and the initiator power supply is connected; when the micro-current passes through the high-heat-conducting rod, the high temperature generated breaks through the safety film, gasifies the liquid carbon dioxide, and the high-pressure shock wave generated by the rapid expansion causes the pressure relief valve to open automatically, and the blasted objects or deposits are pushed outward by the geometric equivalent impact. The blasting process only takes 0.4ms, and it runs at low temperature, does not produce any harmful gases, does not produce arcs and sparks, is not affected by high temperature, high heat, high humidity, high cold, and has no vibration or dust. Carbon dioxide is an inert gas, and the principle of blasting is volume expansion, which is a physical reaction rather than a chemical reaction.

[0005] The technical solution adopted by the present invention is: a blasting tube for foundation reinforcement, suitable for blasting with a single blasting tube, including a tube body with closed ends, a liquid storage tank provided in the tube body, a degassing head provided at one end of the tube body, a degassing plate provided at the end of the degassing head, and a plurality of degassing holes on the degassing plate that are connected with the interior of the degassing head.

[0006] Optionally, the air release plate is a spherical structure with a convex surface facing the outside of the air release head, and the air release holes are evenly distributed on the spherical structure.

[0007] A blasting tube for foundation reinforcement, suitable for single-rod blasting or multiple-rod blasting in series, comprises a tube body with closed ends, a liquid storage tank in the tube body, a gas relief head at one end of the tube body, a plurality of gas relief holes arranged on the side of the gas relief head around its axis, and is characterized in that: an inclined gas guide tube is arranged on the gas relief hole, and the outlet of the gas guide tube is inclined toward the end of the gas relief head.

[0008] Optionally, two ends of the tube body have a groove and a protrusion respectively, the sizes of the groove and the protrusion are adapted, and the side surfaces of the groove and the side surfaces of the protrusion both have pin holes.

[0009] A method for reinforcing foundation by carbon dioxide blasting using the above-mentioned blasting tube comprises the following steps:

[0010] ⑴ Drill blast holes on the surface of the soil to be reinforced. The depth of each blast hole is greater than the length of a single blasting tube, the inner diameter of the blast hole is greater than the outer diameter of a single blasting tube, and multiple air holes are arranged on the surface of the soil;

[0011] (2) Connect the tail end of a single blasting tube to a steel pipe. The total length of the steel pipe and the blasting tube is greater than the depth of the blasthole. The steel pipe is connected to the clamp on the lifting rod. The deflation head of the blasting tube faces the bottom of the blasthole. Slowly put it into the blasthole, keeping the wire connector on the blasting tube outside the blasthole. When the lifting rod contacts the ground, the blasting tube is suspended in the blasthole. At this time, the end of the steel pipe connected to the blasting tube is in the blasthole, and the other end extends above the ground.

[0012] ⑶Fill and block the blast hole with the blasting tube, connect the wire on the blasting tube with the wire of the detonator, and detonate the blasting tube through the detonator;

[0013] (4) After the detonated blasting tube is taken out from the blast hole, small particles of building materials are injected into the gaps in the soil body caused by blasting through the blast hole and the air duct;

[0014] ⑸ Carry out compaction construction after the site is leveled.

[0015] Optionally, the air intake holes are arranged in the fissure area after blasting.

[0016] Optionally, the material used to fill the blasthole in step (3) is a mixture of one or more of slag, clay, and rock powder, and the small-particle building material is a mixture of one or more of soil, gravel, sand, slag, and rock powder.

[0017] A method for reinforcing foundation by carbon dioxide blasting using the above-mentioned blasting tube comprises the following steps:

[0018] ⑴ Drill blast holes on the surface of the soil to be reinforced. The depth of each blast hole is greater than the length of a single blasting tube, the inner diameter of the blast hole is greater than the outer diameter of a single blasting tube, and multiple air holes are arranged on the surface of the soil;

[0019] (2) Connect the tube bodies and wires of multiple blasting tubes in series, fix adjacent blasting tubes to each other, the total length of the multiple blasting tubes in series is greater than the depth of the blasthole, the blasting tube at one end of the multiple blasting tubes in series is a blasting tube with an air release plate at the end, and the air release holes of the remaining blasting tubes are all located on the side of the air release head, and the blasting tube with the air release plate at the end faces the bottom of the blasthole. The clamp on the lifting rod clamps the multiple blasting tubes in series, and slowly puts the blasting tubes in series into the blasthole, keeping the wire connector on the blasting tube outside the blasthole. When the multiple blasting tubes in series reach a predetermined depth, the lifting rod contacts the ground, and the blasting tubes in series are suspended in the blasthole. At this time, one end of the blasting tube located at the top of the blasting tubes in series extends above the ground;

[0020] ⑶Fill and block the blast hole with the blasting tube, connect the wire on the blasting tube with the wire of the detonator, and detonate the blasting tube through the detonator;

[0021] (4) After the detonated blasting tube is taken out from the blast hole, small particles of building materials are injected into the gaps in the soil body caused by blasting through the blast hole and the air duct;

[0022] ⑸ Carry out compaction construction after the site is leveled.

[0023] Optionally, the air intake holes are arranged in the fissure area after blasting.

[0024] Optionally, the material used to fill the blasthole in step (3) is a mixture of one or more of slag, clay, and rock powder, and the small-particle building material is a mixture of one or more of soil, gravel, sand, slag, and rock powder.

[0025] The advantages and positive effects of the present invention are:

[0026] 1. Use spherical air vents or side air vents with oblique air guides, and set air guide holes within the crack area on the ground, so that most of the energy during blasting acts on the lower part, with less impact on the upper soil, achieving effective soil foundation treatment results;

[0027] 2. CO2 blasting achieves effective blasting below the critical foundation point of strong compaction. High-quality small-particle engineering building materials are replaced through blastholes and air holes. Strong compaction foundation treatment is then used to strengthen the effect of CO2 blasting on the upper soil, achieving effective reinforcement of the shallow and deep layers of the soil, and further reducing residual settlement. This effective combination makes foundation treatment more efficient and effective;

[0028] 3. High safety: ① The chemical and physical properties of carbon dioxide are stable and very safe. No harmful substances are produced during the entire explosion process. In terms of physical properties, the critical temperature of carbon dioxide is close to room temperature; ② Carbon dioxide will not explode when it encounters fire during production, storage, and transportation; ③ Carbon dioxide blasting is cold blasting. The so-called "cold" means that carbon dioxide blasting is a process of changing from liquid to gas, which will absorb a lot of heat, lower the surrounding temperature, and will not detonate gas or coal dust. Carbon dioxide blasting is a blasting technology with advanced concepts, safe methods, and significant effects. It has the advantages of no sparks exposed during the blasting process, strong blasting power, no need for gun inspection, and easy operation. In addition, the transportation, storage, and use of carbon dioxide can be exempted from approval; ④ The vibration generated by carbon dioxide cold blasting is weak and has little destructive power, which is convenient for protecting surrounding buildings. The detonation velocity of carbon dioxide cold explosion is much lower than that of explosive blasting, and the impact force is generally 400MPa, which is much lower than the 1000-5000MPa of explosive blasting. Its detonation velocity is about 3m / s, and the destruction radius is only 2-3m; ⑤ The blasting does not produce new harmful gases. Except for the area within 1m of the blasting radius, there is no hazard of excessive carbon dioxide.

[0029] 4. Not regulated, easy to use: Carbon dioxide is a non-explosive item, non-hazardous chemical, not an object of supervision, and not supervised by the quality inspection department. The volume of devices such as carbon dioxide blasting tubes is less than 500L, and they are pressure vessels not supervised by the quality inspection department. There is no need to worry about causing major or serious safety accidents. In addition, the application of carbon dioxide cold blasting system can reduce the probability of major or serious production safety accidents.

[0030] 5. More environmentally friendly: ① The carbon dioxide used comes from chemical plants and coal-fired power plants, which is waste gas recycling. Therefore, carbon dioxide does not need to be prepared and does not consume energy; ② The process of carbon dioxide cold blasting is different from that of explosive explosion, and it will not produce toxic and harmful gases such as carbon monoxide, nor will it produce dust.

[0031] 6. Low cost and easy availability of raw materials: Carbon dioxide resources are widely distributed, easy to purchase, and have no regulatory costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an implementation mode of a bursting tube in the present invention;

[0033] Figure 2 yes Figure 1Schematic diagram of the plane structure of the middle air release plate;

[0034] Figure 3 It is a structural schematic diagram of another embodiment of the bursting tube in the present invention;

[0035] Figure 4 It is a schematic diagram of the distribution of rupture areas after blasting;

[0036] Figure 5 It is a schematic diagram of the layout of a single blasting tube for blasting;

[0037] Figure 6 It is a schematic diagram of the blasting arrangement method of connecting multiple blasting tubes in series;

[0038] Figure 7 It is a schematic diagram of the dynamic compaction construction process;

[0039] In the figure: 1. vent head; 1-1. side vent hole; 1-2. air guide tube; 1-3. protrusion; 1-4. groove; 2. connector; 3. liquid storage tube; 4. liquid carbon dioxide; 5. push / pull rod; 6. heater; 7. vent plate; 7-1. bottom vent hole; 8. first carbon dioxide blasting tube; 9. ground; 10. lifting rod; 11. steel pipe; 12. critical soil depth; 13. second carbon dioxide blasting tube; 14. third carbon dioxide blasting tube; 15. vent hole outlet; 16. crushing area; 17, 18. fissure area; 19. vibration area. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0041] like Figure 1 , Figure 2 As shown, the present invention provides a blasting tube for foundation reinforcement, including a tube body with closed ends, a liquid storage tank in the tube body, a degassing head 1 at one end of the tube body, a degassing plate 7 at the end of the degassing head 1, and a plurality of degassing holes on the degassing plate 7 that are connected with the inside of the degassing head 1, wherein the degassing hole is a bottom degassing hole 7-1.

[0042] The air release plate 7 is a spherical structure with protrusions 1-3 toward the outside of the air release head 1, and the air release holes are evenly distributed on the spherical structure.

[0043] The blasting tube can be used for single blasting. The difference between the blasting tube and the carbon dioxide blasting tube in the prior art lies in the arrangement position of the air leakage hole. The blasting purpose of the carbon dioxide blasting tube in the prior art is to crush the soil. Therefore, its air leakage hole is arranged on the side of the air leakage head 1 of the tube body, and the axis of the air leakage hole is perpendicular to the axis of the tube body, so that the high-pressure gas is dispersed as much as possible around the blasting tube during blasting to achieve the purpose of crushing the soil. The blasting purpose of the blasting tube of the present invention is to compress the soil below the blasting tube while minimizing the impact on the soil above. Therefore, the air leakage hole of the present invention is arranged at the lower end of the tube body, and the surface of the air leakage plate 7 is a spherical surface, so that the high-pressure gas ejected from the air leakage hole is in a downward divergent state, thereby achieving the purpose of compacting the soil below.

[0044] like Figure 3 As shown, a blasting tube for foundation reinforcement, which can be used for blasting as a single tube or in series with a blasting tube with an air leakage hole at the lower end, comprises a tube body with closed ends, a liquid storage tank in the tube body, an air leakage head 1 is arranged at one end of the tube body, a plurality of air leakage holes are arranged on the side of the air leakage head 1 around its axis, the air leakage hole is a side air leakage hole, characterized in that: an air guide tube 1-2 is arranged obliquely on the air leakage hole, and the outlet of the air guide tube 1-2 is inclined toward the end direction of the air leakage head 1; a groove 1-4 and a protrusion 1-3 are respectively provided at both ends of the tube body, the sizes of the groove 1-4 and the protrusion 1-3 are adapted, and the side of the groove 1-4 and the side of the protrusion 1-3 are provided with pin holes.

[0045] The blasting tube uses the air guide 1-2 welded on the side air leakage hole 1-1 to guide the injection direction of the high-pressure gas during blasting toward the lower soil, so as to achieve the purpose of compacting the lower soil. The arrangement of the groove 1-4, the protrusion 1-3 and the pin hole is used for connecting multiple blasting tubes in series. When used in conjunction with a blasting tube with a bottom air leakage hole 7-1, a protrusion 1-3 adapted to the groove 1-4 needs to be arranged on the blasting tube with the bottom air leakage hole 7-1.

[0046] The present invention relates to a method for reinforcing foundation by carbon dioxide blasting using the above-mentioned blasting tube. This embodiment introduces a method for blasting with a single tube, comprising the following steps:

[0047] (1) Drilling blast holes on the surface of the soil to be reinforced, the depth of each blast hole is greater than the length of a single blasting tube, the inner diameter of the blast hole is greater than the outer diameter of a single blasting tube, and multiple air holes are arranged on the surface of the soil, and the air holes are arranged on the crack areas 17 and 18 after blasting;

[0048] ⑵ If Figure 5 As shown, the tail end of a single blasting tube is connected to a steel tube 11, the total length of the steel tube 11 and the blasting tube is greater than the depth of the blast hole, the steel tube 11 is connected to the clamp on the lifting rod 10, the air release head 1 of the blasting tube is facing the bottom of the blast hole, and it is slowly put into the blast hole, keeping the wire connector on the blasting tube outside the blast hole, when the lifting rod 10 contacts the ground 9, the blasting tube is suspended in the blast hole, at this time, one end of the steel tube 11 connected to the blasting tube is located in the blast hole, and the other end extends above the ground 9;

[0049] ⑶Fill and block the blast hole with the blasting tube, connect the wire on the blasting tube with the wire of the detonator, and detonate the blasting tube through the detonator;

[0050] (4) After the detonated blasting tube is taken out from the blast hole, a mixture of one or more of soil, gravel, sand, slag and rock powder is injected into the voids in the soil body caused by blasting from the blast hole and the air duct hole;

[0051] ⑸ Carry out strong compaction construction.

[0052] The material used to fill the blasthole in step (3) is a mixture of one or more of slag, clay, and rock powder.

[0053] The present invention relates to a method for reinforcing foundation by carbon dioxide blasting using the above-mentioned blasting tube. This embodiment introduces a method for blasting by connecting multiple blasting tubes in series, including the following steps:

[0054] ⑴ Drill blast holes on the surface of the soil to be reinforced. The depth of each blast hole is greater than the length of a single blasting tube, the inner diameter of the blast hole is greater than the outer diameter of a single blasting tube, and multiple air holes are arranged on the surface of the soil;

[0055] ⑵ If Figure 6As shown, the tube bodies and wires of multiple blasting tubes are connected in series, and adjacent blasting tubes are fixed to each other by grooves 1-4, protrusions 1-3 and fixing pins passing through pin holes. The total length of the multiple blasting tubes connected in series is greater than the depth of the blast hole. The blasting tube at one end of the multiple blasting tubes connected in series is a blasting tube with an air release plate 7 at the end, and the air release holes of the remaining blasting tubes are all located on the side of the air release head 1, and the blasting tube with the air release plate 7 at the end faces the bottom of the blast hole. The clamp on the lifting rod 10 clamps the multiple blasting tubes connected in series, and slowly puts the blasting tubes connected in series into the blast hole, keeping the wire connector on the blasting tube outside the blast hole. When the multiple blasting tubes connected in series reach a predetermined depth, the lifting rod 10 contacts the ground 9, and the blasting tubes connected in series are suspended in the blast hole. At this time, one end of the blasting tube located at the top of the blasting tubes connected in series extends above the ground 9.

[0056] ⑶Fill and block the blast hole with the blasting tube, connect the wire on the blasting tube with the wire of the detonator, and detonate the blasting tube through the detonator;

[0057] (4) After the detonated blasting tube is taken out from the blast hole, a mixture of one or more of soil, gravel, sand, slag and rock powder is injected into the voids in the soil body caused by blasting from the blast hole and the air duct hole;

[0058] ⑸ Carry out strong compaction construction.

[0059] The principle of the soil reinforcement method using carbon dioxide blasting with a blasting tube is that carbon dioxide blasting creates a cavity underground, and a mixture of one or more of soil, gravel, sand, slag, and rock powder can be poured into the cavity through blast holes and air holes to replace a portion of high-quality soil, thereby achieving a replacement foundation treatment effect. The blasting produces compression of the lower soil layer, and the setting of the air holes reduces the force of the explosion on the upper soil layer, thereby achieving a foundation treatment effect.

[0060] Vibration waves are generated underground to achieve the effect of soil liquefaction foundation treatment, and can be used to treat deep foundations that cannot be treated by strong compaction;

[0061] It can effectively control the residual settlement of foundation treatment, overcome the deficiency of ordinary strong compaction that can only handle 6-8 meters of thickness, and achieve deep foundation treatment;

[0062] High-pressure gas is suddenly released in the blasthole and impacts the soil to generate stress waves. During the propagation of stress waves in the soil, cracks in the soil are generated, expanded, extended and connected.

[0063] In the crushing area, the high-pressure gas released instantly from the blasting port acts on the wall of the blasthole, generating a blasting stress wave. Since the impact force of the gas blasting is much greater than the dynamic compressive strength of the soil, the soil skeleton is severely deformed and damaged under the action of the blasting stress wave; the soil near the blasting hole is radially compressed and tangentially stretched, the medium unit moves, the soil breaks, and the original cracks expand. As the blasting stress wave propagates and attenuates, when its strength is no longer enough to break the soil, the soil medium unit will only vibrate, and the blasting stress wave propagates in the form of seismic waves until it disappears.

[0064] The blasting tube in the above method needs to be installed in the operating room 9 on the ground, and the method is 1. Assembly - ① Place the liquid storage tube 3 on the display rack, insert the iron wire into the main tube, and make the end with the hook extend from the end of the main tube with the lettering, then hook the wire of the heater 6 with the iron wire and pull the iron wire to make the wire extend from the other end of the liquid storage tube 3; ② Install the sealing gasket on the constant pressure reducing slice, and connect it with the wire of the heater 6 (note that the end of the constant pressure reducing slice with protrusions 1-3 faces inward), then pull out the heater 6, so that the constant pressure reducing slice is completely inserted into the liquid storage tube 3; ③ Tighten the release tube first, and then tighten the filling valve, until they cannot be twisted by hand; ④ Place the screwed fracturing device (that is, the blasting tube mentioned above) on the jaws of the disassembly and assembly machine, and insert one end of the filling valve into the disassembly and assembly head. Then rotate the emergency stop button clockwise and press the start button to start the disassembler; ⑤ Press and hold the clamping button until the pressure rises to above 10MPa and then release it, then press and hold the tightening button. When the pressure rises to 10MPa, release the tightening button; ⑥ Press and hold the release button and turn the fracturing machine around; ⑦ Repeat step ⑤; ⑧ Measure the resistance, and a resistance of 1-2 ohms is normal.

[0065] 2. Inflation - ① Place the fracturator on the filling table and align the filling hole, tighten the clamping rod and use the hexagonal wrench to open the filling valve; then open the ball valve corresponding to the fracturator and close the ball valve without the fracturator; ② Press the reset button on the filling machine to reset the weighing instrument; ③ Deflation: Before the first work every day, it is necessary to deflate the air and empty the entire pipeline. First open the inlet and outlet ball valves on the filling table, then press the deflation button until the outlet ball valve sprays out continuous white gas, and then close the outlet ball valve; ④ Pipe cleaning: Press After pressing the deflation button, close the inlet ball valve and then open the outlet ball valve to release the carbon dioxide in the fracturing device. After releasing most of it, close the outlet ball valve and repeat two or three times; ⑤ Filling: After closing the outlet ball valve, press the boost button. The machine will stop automatically after the fracturing device is filled. After the machine stops, use an Allen wrench to close the filling valve of the fracturing device, then close the inlet ball valve, and then open the outlet ball valve to release excess gas; ⑥ Test the sealing: Put the filling valve and release tube of the fracturing device into the water respectively to ensure that there are no large bubbles.

[0066] Regarding the transportation of blasting tubes: (1) The blasting tube is 1m long and 73mm in outer diameter. After being filled with liquid carbon dioxide, its mass is about 25kg. The blasting tube is made of high-quality imported steel, is strong and durable, and can be reused 4000 times. In addition to being able to start the blasting by connecting the circuit, the device will not be damaged by bumps, collisions, or high temperatures; (2) After the blasting tube is filled with liquid carbon dioxide on the ground 9, the mine will arrange personnel to transport it to the blasting site in advance by mine car; liquid storage tubes 3 that cannot be carried out or are not used up must be promptly recovered and lifted to the surface for proper storage.

[0067] The blasthole is designed to be 1m deep. After blasting, the blaster and steel pipe 11 are pulled out, the hole is sealed in time, and the extraction pipeline is connected for extraction. The extraction concentration, negative pressure and other indicators of the blasting hole are measured twice a day in the morning and afternoon.

[0068] For the case where multiple blasting tubes are connected in series: first connect the first carbon dioxide blasting tube 8 and the second carbon dioxide blasting tube 13, insert the fixing pin, and shorten the DC plug of the first carbon dioxide blasting tube, twist the two wires together, and wrap them with insulating tape, and then connect the cone head; first insert the two connected blasting tubes into the blast hole, and before inserting, connect the clamp on the lifting rod 10 to the second carbon dioxide blasting tube 13, and then insert it into the blast hole, and use the lifting rod 10 to support the blasting tube to prevent the blasting tube from falling into the blast hole; connect the third carbon dioxide blasting tube to the second carbon dioxide blasting tube After the blasting tube 13 is connected, clamp the third carbon dioxide blasting tube 14 with the clamp on the second lifting rod 10; then pull out the first lifting rod 10, and put the blasting tube into the blast hole; repeat the above steps to connect the remaining blasting tubes; use drilled slag, clay, rock powder, etc. to fill, and the filling length is strictly carried out according to the blasting design to ensure that the blasting tube cannot fly; use 15 steel wire rope to tie up the head of each blasting tube; connect all blasting tubes with wires according to the power of the smart cloud safety detonator (the blasting tubes in a single hole are connected in series, and the resistance value increases cumulatively).

[0069] After blasting, the blasting tube must be recovered: ① Transport the recovered blasting tube to the operating room by a mine car, place the blasting tube on the jaws of the disassembly machine, insert one end of the filling valve into the disassembly head, then rotate the emergency stop button clockwise, and press the start button to start the disassembly machine; ② Press and hold the clamping button until the pressure rises to above 10MPa and then release it, then press and hold the disassembly button, rotate it one to two times, and then release the disassembly button; ③ Press and hold the release button, then turn the blasting tube around; ④ Repeat step ②; ⑤ Clean up the residue inside the blasting tube for next use.

[0070] After the blasting construction is completed, the strong compaction technology, such as Figure 7As shown, the steps include: ⑴ If there is water accumulation on the surface of the site, it should be discharged in time, and pre-treatment methods such as mechanical walking disturbance can be adopted on site for drainage; ⑵ The site is leveled, and the leveling elevation is 7.2-7.35m; ⑶ Backfill 0.5m of medium-coarse sand, with an error of ±5; ⑷ Install plastic drainage boards, arranged in a square, with a spacing of 1m, and the bottom elevation is shown in the drainage board layout diagram; ⑸ Backfill 1m of mountain soil; ⑹ Excavate drainage ditches around the outer periphery of the reinforcement area, with a ditch depth of not less than 1.3m (below the top surface of the blown fill), and the specific width can be determined according to the actual situation on site; ⑺ Wait until the water level is about to reach The depth below the rammed surface is not less than 2m. First, full-line construction is carried out, and then spot ramming construction is carried out. The ramming energy is 800kN.m-2000kN.m. The number of ramming times and other processes refer to the strong ramming test ramming process and detection point layout diagram; ⑻ During spot ramming construction, if there is water in the ramming pit, it should be discharged in time. If the ramming pit is deep, sandy soil should be backfilled before subsequent construction; ⑼ After the strong ramming is completed, the site is leveled and the last full ramming is carried out; ⑽ Before strong ramming, it should be ensured that the pore water pressure dissipates by 75%, and the water level will be no less than 2m below the ramming surface. The full ramming energy is 500kN.m. The hammer print overlaps 1 / 4, and two hits are made each time; ⑾ Finally, use a 200kN vibratory roller to roll 6-8 times, and the compaction degree is not less than 90%.

[0071] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A blasting tube for foundation reinforcement, comprising a tube body with both ends closed, a liquid storage tank in the tube body, and a deflation head at one end of the tube body, characterized in that: A degassing plate is arranged at the end of the degassing head, and the degassing plate has a plurality of degassing holes which are communicated with the interior of the degassing head.

2. The blasting tube for foundation reinforcement according to claim 1, characterized in that: The air release plate is a spherical structure with a convex surface facing the outside of the air release head, and the air release holes are evenly distributed on the spherical structure.

3. A blasting tube for foundation reinforcement, comprising a tube body with both ends closed, a liquid storage tank in the tube body, a gas relief head at one end of the tube body, and a plurality of gas relief holes on the side of the gas relief head around its axis, characterized in that: The air leakage hole is provided with an air guide pipe which is arranged obliquely, and the outlet of the air guide pipe is inclined toward the end direction of the air leakage head.

4. The blasting tube for foundation reinforcement according to claim 3, characterized in that: The two ends of the tube body are respectively provided with a groove and a protrusion, the sizes of the groove and the protrusion are adapted, and the side surfaces of the groove and the protrusion are both provided with pin holes.

5. A method for strengthening foundation by carbon dioxide blasting using a blasting tube as claimed in any one of claims 1 to 4, comprising the following steps: ⑴ Drill blast holes on the surface of the soil to be reinforced. The depth of each blast hole is greater than the length of a single blasting tube, the inner diameter of the blast hole is greater than the outer diameter of a single blasting tube, and multiple air holes are arranged on the surface of the soil; (2) Connect the tail end of a single blasting tube to a steel pipe. The total length of the steel pipe and the blasting tube is greater than the depth of the blasthole. The steel pipe is connected to the clamp on the lifting rod. The deflation head of the blasting tube faces the bottom of the blasthole. Slowly put it into the blasthole, keeping the wire connector on the blasting tube outside the blasthole. When the lifting rod contacts the ground, the blasting tube is suspended in the blasthole. At this time, the end of the steel pipe connected to the blasting tube is in the blasthole, and the other end extends above the ground. ⑶Fill and block the blast hole with the blasting tube, connect the wire on the blasting tube with the wire of the detonator, and detonate the blasting tube through the detonator; (4) After the detonated blasting tube is taken out from the blast hole, small particles of building materials are injected into the gaps in the soil body caused by blasting through the blast hole and the air duct; ⑸ Carry out compaction construction after the site is leveled.

6. The method for strengthening foundation by carbon dioxide blasting according to claim 5, characterized in that: The air vents are arranged on the fissure area after blasting.

7. The method for strengthening foundation by carbon dioxide blasting according to claim 5, characterized in that: The material for filling the blasthole in step (3) is a mixture of slag, clay and rock powder, and the small-particle building material is a mixture of one or more of soil, gravel, sand, slag and rock powder.

8. A method for strengthening foundation by carbon dioxide blasting using a blasting tube as claimed in any one of claims 1 to 4, comprising the following steps: ⑴ Drill blast holes on the surface of the soil to be reinforced. The depth of each blast hole is greater than the length of a single blasting tube, the inner diameter of the blast hole is greater than the outer diameter of a single blasting tube, and multiple air holes are arranged on the surface of the soil; (2) Connect the tube bodies and wires of multiple blasting tubes in series, fix adjacent blasting tubes to each other, the total length of the multiple blasting tubes in series is greater than the depth of the blasthole, the blasting tube at one end of the multiple blasting tubes in series is a blasting tube with an air release plate at the end, and the air release holes of the remaining blasting tubes are all located on the side of the air release head, and the blasting tube with the air release plate at the end faces the bottom of the blasthole. The clamp on the lifting rod clamps the multiple blasting tubes in series, and slowly puts the blasting tubes in series into the blasthole, keeping the wire connector on the blasting tube outside the blasthole. When the multiple blasting tubes in series reach a predetermined depth, the lifting rod contacts the ground, and the blasting tubes in series are suspended in the blasthole. At this time, one end of the blasting tube located at the top of the blasting tubes in series extends above the ground; ⑶Fill and block the blast hole with the blasting tube, connect the wire on the blasting tube with the wire of the detonator, and detonate the blasting tube through the detonator; (4) After the detonated blasting tube is taken out from the blast hole, small particles of building materials are injected into the gaps in the soil body caused by blasting through the blast hole and the air duct; ⑸ Carry out compaction construction after the site is leveled.

9. The method for strengthening foundation by carbon dioxide blasting according to claim 8, characterized in that: The air vents are arranged on the fissure area after blasting.

10. The method for strengthening foundation by carbon dioxide blasting according to claim 8, characterized in that: The material for filling the blasthole in step (3) is a mixture of one or more of slag, clay, and rock powder, and the small-particle building material is a mixture of one or more of soil, gravel, sand, slag, and rock powder.

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