Original title: Hole guiding scheme of down-the-hole hammer Pile Foundation Project of Plot 1-02 of Xinghe Legend Garden Construction scheme of pile-sinking with down-hole hammer According to the geological survey report and site survey, when the construction of prestressed pipe pile in Block 1-02 of Xinghe Legend Garden crosses the gravelly clay layer, some areas will encounter moderately weathered and slightly weathered spheres or interlayers, which will cause pile breaking or cracking, and it is difficult to sink into the bearing stratum, so it is necessary to use large-diameter pneumatic down-the-hole hammer to cross the moderately weathered and slightly weathered spheres or interlayers. Therefore, a special scheme for down-the-hole hammer guiding hole is prepared. I. Technology and Parameter Analysis of Pile Sinking with Dth Hammer
Pile-sinking process with down-the-hole hammer Pneumatic down-the-hole hammer is also called pneumatic impactor. Under the action of air compressor, the large-diameter down-the-hole hammer uses compressed air as the power medium to drive its work, and carries out high-frequency crushing and impact on hard rock; In the process of pneumatic Dth hammer drilling, high-pressure air drives the piston in the impactor to do high-frequency reciprocating motion, and the kinetic energy generated by the motion is continuously transmitted to the drill bit, so that the drill bit can obtain certain impact work. Under the action of the impact energy, the drill bit continuously impacts the rock at the bottom of the hole. Under the action of the impact energy, the rock is crushed in volume. At the same time, the compressed air generated by the air compressor is also used as the well flushing medium to carry the rock debris crushed by the down-the-hole hammer out of the hole. The large diameter Dth hammer has achieved good results in the drilling of block stone, boulder, moderately weathered and slightly weathered hard rock strata, which meets the smooth pile formation of prestressed pipe piles. The hole guiding technology of large diameter pneumatic Dth hammer is to combine Dth hammer construction technology with prestressed pipe pile hole guiding technology to solve the problem of pile sinking in complex strata. The process flow of pile sinking construction in this project is shown in the following figure: A. Dth hammer leading hole; B. Down-the-hole hammer drilling with casing; C. Prestressed pipe pile sinking; D. Prestressed pipe pile sinking to the bearing stratum. \u2460 Lead the pile driver in place to ensure the verticality of the pile driver, and lower the down-the-hole hammer drilling tool (as shown in Fig. 1-a); \u2461 The guide hole penetrates the gravel layer. Start the air compressor and drill with the down-hole hammer until the pilot hole passes through the moderately weathered or slightly weathered sphere (as shown in Fig. 1-b); Expand the full text \u2462 Pile driver is in place. Pull out the drilling tool, install the pipe pile and conduct the pile sinking operation (as shown in Fig. 1-c); \u2463 Drive and send piles to the highly weathered mudstone layer, and stop hammering according to the standard (as shown in Fig. 1-d). 2. Machines and equipment: According to the process requirements, the following supporting equipment shall be selected to realize the construction of large diameter pneumatic down-the-hole hammer: Pneumatic Dth hammer and drill bit (Φ560): 2 sets of QZ26 type; \u2461 30m ³/min Ingersoll Rand medium air compressor: 2 sets; II) Analysis on technical parameters of down-the-hole hammer At present, the Dth hammer is mainly used below 300 mm in China, and the hole larger than 300 mm belongs to the scope of large diameter Dth hammer drilling. There are two main parameters in pneumatic Dth hammer drilling technology: air pressure and air volume. These two parameters mainly meet the requirements of two aspects: 1. Meet the requirements of rock breaking power of driving impactor; 2. The rock debris in the hole shall be discharged out of the well to avoid repeated crushing. Different hydrogeological conditions, borehole structure, borehole depth and borehole diameter parameters have different requirements for air volume and air pressure. The parameters of Dth hammer can be determined according to the following methods. Selected: (1) Air volume. The rated air volume of the impactor selected in this project is 30 m ³/min. With the increase of hole depth and hole diameter, it is necessary to ensure the discharge of rock debris at the bottom of the hole and reduce the repeated crushing of rock powder to achieve ideal drilling efficiency. Generally, it is required that the upward return velocity of air volume in the hole is ≥ 15m/s. At this time, the airflow velocity is greater than the suspension velocity of rock debris. The air volume can be calculated according to the following formula according to the conditions such as the diameter of the drill hole, the outer diameter of the drill pipe, and the upward return air speed on the slag discharge channel: Q=47.1K1K2（D2 -d2 ）V Where: Q — — air supply volume m ³/min; K1 — — correction coefficient of hole depth K1 = 1 ~ 1.1; K2 — — Gushing water system in the hole K2 = 1 ~ 1.5; D — — drilling diameter; D — — outer diameter of drill pipe; V — — Upward wind speed (15 ~ 25m/s). According to the formula, the air return velocity at the orifice is 15 m/s, the borehole correction coefficient of borehole depth is K1 = 1.0, and the water inflow coefficient in the borehole is K2 = 1.5; (2) Wind pressure. QZ26 Dth hammer is a low pressure Dth hammer, the required wind pressure is 0. 5 ~ 0. 7 MPa, but the drilling efficiency is directly affected by the wind pressure, mining dth bit , the greater the wind pressure, the greater the impact power, and the higher the rock breaking efficiency. Therefore, to complete the large-diameter pneumatic down-the-hole hammer drilling, first of all, the working pressure of the impactor should be met to make it work at full load, and at the same time, the pressure along the way (0.0015 MPa/m) brought by the increase of the drilling depth should also be met to overcome the water column pressure below the water level and the pressure difference for removing the debris in the hole. II. Treatment of Main Technical Problems in Hole Guide ConstructionInsufficient air volume of guide hole Countermeasures: According to the requirements of the borehole diameter and the air volume of the selected air compressor, the down-the-hole hammer and casing drilling process shall be used to guide the hole. According to the guide hole diameter capacity and casing specification met by the air compressor. Through practical application, Dth hammer drilling with casing solves the problem of insufficient air volume, and the ideal effect is obtained in the construction process. (II) Rock debris perforation Countermeasures: The reason why the cuttings are drilled in series is that the distance between the two pilot holes is small. Under the action of high-pressure air, the high-pressure air passes through the pores in the formation, and the boreholes are connected with each other, resulting in the reduction of high-pressure air pressure. In the construction process of prestressed pipe pile Dth hammer leading hole, because of the problem of rock debris string hole, the air volume at the leading hole outlet is less than 15m/s, which can not achieve the purpose of debris removal, so that rock debris enters another hole through the pore, and a certain thickness of sediment is formed in the adjacent hole. Through research and analysis, it is found that the sediment in the hole has little influence on the sinking of prestressed pipe piles, and there are two main reasons: On the one hand, because the sediment particles in the hole are small and the structure is loose, it has little influence on the resistance of pile sinking. On the other hand, the sediment in the hole forms a saturated sand layer under the action of water in the hole, and the saturated sand layer produces sand liquefaction under the action of vibration force during the construction of the pipe pile, so that the sediment in the hole has little influence on the pile sinking. Therefore, in the construction process, no special treatment was carried out on the pile-hole guide hole. Through the actual construction, it was found that the rock debris string hole phenomenon did not have a greater impact on the pile-hole guide pile sinking. (III) How to control the verticality of guide hole Countermeasures: Start the air compressor to drive the Dth hammer to start drilling. During the initial drilling, the drilling speed shall be low, the verticality of the drill pipe shall be rechecked frequently, and it shall be adjusted in time. The down-hole hammer and casing drilling technology is used to guide the hole, which not only solves the problem of insufficient outlet air volume, but also controls the verticality of the guide hole. III. Guarantee of construction period of down-the-hole hammer There are about 200 prestressed pipe piles to be drilled in the concentrated area of weathered and slightly weathered spheres or interlayers in this project. Two down-the-hole hammer drills are arranged to enter the site for construction. Each down-the-hole hammer drill can drill about 5 piles every day. The drilling operation of about 10 piles is completed every day. The drilling work in this area is completed within 20 days. After this part of hole guiding operation is completed, a down-the-hole hammer drill is left as a standby, and hole guiding operation is carried out when the remaining pipe pile construction area needs hole guiding. After receiving the Letter of Acceptance from Party A, immediately organize the mobilization of mechanical equipment and pipe pile materials. This project plans to arrange 2 down-the-hole drills for pipe pile hole guiding operation. During the construction process, the number of hole guiding equipment can be adjusted and increased according to the actual situation, so as to ensure the realization of the total construction period target. END Source: Baidu Library We are committed to protecting the copyright of the author, the source of the content has been marked,overburden drilling systems, only for the dissemination and sharing of knowledge. No other commercial profit, if there is infringement, please contact us to delete. Push Return to Sohu to see more Responsible Editor:. wt-dthtools.com
Original title: How to choose the drill bit of rotary drilling rig? All workers with experience in mechanical work are deeply concerned about the wear and tear of machinery. The selection of key parts of machinery directly determines the service life of mechanical equipment. In this regard, Nanjing Infinite Xiaobian introduces how to select drill bits for rotary drilling rigs. Select the drill bit according to the geological condition The main function of the rotary drilling rig is to form a hole slot on the surface, and the working object is rock. Because the depth of the pile hole is shallow, the rock structure, particle size, porosity, cementation condition, occurrence,dth rock bit, compressive strength and so on have undergone complex changes through tectonic movement, natural mechanical and chemical action. In addition, China has a vast territory, so the working object of the rotary drilling rig is particularly complex. To sum up,mining dth bit, there are the following categories. According to lithology, it can be divided into mud shale, sandstone, limestone, granite, etc.; according to genesis, Tapered Rock Bit ,dth button bits, it can be divided into magmatic rock Sedimentary rock, metamorphic rock; solid according to mechanical properties Plastic and loose. So how to choose the drill bit according to the formation conditions? The following is a classified introduction 。 (1) Clay: the rotary drilling bucket with single-layer bottom shall be selected. If the diameter is too small, the two-petal bucket or the drilling bucket with unloading plate can be used. (2) Sludge, soil layer with weak viscosity, sandy soil and pebble layer with poor cementation and small particle size can be equipped with double-bottom drilling bucket. (3) Hard daub: select rotary drilling bucket with single soil inlet (single and double bottoms) or straight screw with bucket teeth. (4) Frozen soil layer: the straight spiral drilling bucket and rotary drilling bucket with bucket teeth can be used if the ice content is low, and the conical spiral drill bit can be used if the ice content is high. It should be noted that the spiral drill bit is effective for soil layers (except silt), but it must be used when there is no groundwater, so as to avoid jamming caused by suction. (5) Cemented gravel and strongly weathered rocks: conical auger bits and rotary drilling buckets with double bottoms shall be provided (single port for larger particle size and double port for smaller particle size).
Wind bedrock: equipped with rotary drilling bucket with double-bottom of pick barrel coring bit and conical auger bit, or rotary drilling bucket with double-bottom of pick straight auger bit. (7) Slightly weathered bedrock: if the diameter of the rotary drilling bucket equipped with cone barrel coring bit and conical auger bit with double bottom is too large, the grading drilling process shall be adopted. As the basic distributor of XCMG, Nanjing Infinite has sold various series and models of rotary drilling rigs of XCMG to customers in Jiangsu, Zhejiang, Shandong, Fujian, Sichuan and other regions, and has served in the construction of Lianxu high-speed railway, Anjiu high-speed railway, Weilai high-speed railway and various piles. At the same time, it has more than 50 sets of self-owned equipment, 220, 280,fastest dth hammer, 360, 400 and other types of rotary drilling rigs for rent, and the leasing business is all over the country. Return to Sohu to see more Responsible Editor:. wt-dthtools.com
Original title: Automatic binding machine punching alarm processing method Automatic binding machine punching alarm is an early warning mechanism of automatic binding machine. Xiaobian has collected many questions about automatic binding machine punching alarm to answer them. Of course, if you have any questions and questions about buying automatic binding machine, you can also call us at 134-6631-0998. 1. Feeding alarm: In case of binding alarm, first check whether the nylon tube of the binding machine is used up. Handling method: replace the nylon tube 1. Insert the needle placed on the top of the binding machine from the material inlet ? Gently rotate clockwise 360 ° downward; 2. Sleeve the remaining tube over the needle And is pul out from that feeding port together with the clean needle; 3. Insert a new nylon tube and insert in place 。 Note that the nylon tube must be straight and cannot be bent, otherwise it cannot be used normally. II. Shield alarm: In case of passport alarm,DHD Drill bit, first check whether the shield is closed. Handling method: 1. Close the shield ? Continue to operate after the lamp is off. 2. Lift the shield ? Return to the original position. If it still does not work, check whether the connecting wire falls off and is desoldered. 3. Punching alarm: When punching alarm occurs, there may be several situations that need to be checked. 1. Check whether there are paper scraps in the cavity of the bit. 。 2. Check whether the bound paper vouchers are mixed with metal products. 。 3. Is it used too often? ? Causes the drill bit to become hot. 4. Is the drill bit dull? 。 5. Whether the upper part of the drill bit is unblocked 。 Handling method: 1. Open the shield ? Remove the drill bit and clean the drill bit cavity and the paper scraps in the drill bushing. 2. Staples in vouchers and paper ,rock drilling tools, paper clips, or other metallic foreign matter is checked out and removed. 3. Suspend use 。 4. Sharpening drill 。 Method: When the cutting edge of the drill is not sharp or needs to be cleaned: a. Remove the drill : Press the key to make the drill bit run downward for about 2cm. (Place a piece of paper on the bedplate below the drill bit, so that paper scraps may fall on the paper when the drill bit is removed.) Loosen the drill set screw with a T-shaped wrench. When loosening the second screw, hold the drill shank by hand to avoid damage to the drill due to its own weight. b. Clean the drill bit : Loosen the butterfly screw on the sharpener body, dhd drill bit ,dth hammer bit, pull out the insert rod, insert the drill bit into the sharpener body, align the end face of the tool handle with the end face of the sharpener body, fix it with the butterfly screw, reinsert the insert rod, and press its head with the palm of your hand to push out the paper scraps in the drill bit. Expand the full text c. Sharpening drill : Insert the drill bit into the sharpener body, align the end face of the tool handle with the end face of the sharpener, fix it with a butterfly screw, slowly insert the sharpening device into the sharpen body to make it touch the drill tip, and rotate the sharpeners clockwise and evenly for 5-6 times (do not use too much force, otherwise the drill tip will bend). Remove the drill bit and check if the mouth is sharp. d. Press Press the "Down" key to move the drilling motor down 2-3cm, open the transparent window on the upper part of the drill bit, and clean up the paper scraps inside. 4. Binding alarm: There are three possible phenomena. 1. Check whether there are paper scraps in the punched holes. 。 2. Whether the drill bit is installed in place in the drill bushing 。 3. Whether the binding paper has slipped from the binding position 。 Handling method: 1. Remove the paper scraps in the voucher 。 2. Remove the drill bit ? Press in place again and tighten the nut. 3. Rearrange the vouchers to be bound , and then bind. If the drill bit is too heavily loaded to drill smoothly, the LCD panel will display a service fault code (the light will flash). Reasons may include: 1. Some metal objects are mixed in the document; 2. There are paper scraps left in the drill bit during drilling; 3. The drill bit has become blunt; Workaround steps: (1) Open the safety cover and take out the drill bit to remove any remaining paper fragments. (2) Check whether there are paper clips, staples or other metal objects mixed in the documents,dth drilling hammer, and take them away. (3) Reinstall the drill bit, close the safety shield and restart drilling. (4) If the drilling lamp is still flashing, please take out the drill again and sharpen the drill. Return to Sohu to see more Responsible Editor:. wt-dthtools.com
Original title: What is the drilling technology of PC endurance board? As a good building material and equipment,mining drill bit,Mining Drilling Equipment, PC endurance board has high strength and durability. Even though it is very good, Borehole Drill Bits ,dth drill bits, it also causes losses to users due to a wrong construction method of cracks along nail holes. Therefore, drilling in PC endurance board is a very important technology. Considering that the raw material of the polycarbonate solid sheet will show thermal expansion and shortening, and thus its fixing time has a significant effect, the possibility of quality problems after the item is very high if the nails fixed on the board are not opened directly. It is necessary to pull the extension to reduce the failure rate of the solid board. So, how to process the PC endurance board-drilling operation? The simple way is to use the solid piece piercing bit directly, which can pick a thicker bit. ? Larger or wobbly holes. The diameter of the hole diameter is about two thirds larger than the left and right of the nail being drilled. The rear number is preferably larger. Return to Sohu to see more Responsible Editor: (function() { function getBrandHtml() { var brands = [],down the hole bit, html = ''; for(var i = 0; i < brands.length; i++) { var brand = brands; if(brands.length i+1) { html+= ''+brand.name+''; } else { html+= ''+brand.name+'、'; } } return html; }; if(document.getElementById('linkBtn')){ document.getElementById('linkBtn').onclick = function() { $('#brands').removeClass('brand');$ ( '# tipInfo').text ( 'Real name responded'); $ ('#linkBtn').remove();$ ('.real-response .content').css('line-height', '20px');$ ('.real-response .time').css('line-height', '20px'); }; document.getElementById('brands').innerHTML = getBrandHtml(); }; })();。 wt-dthtools.com
Original title: The Second Evaporation and Crystallization New Technology Industry Development Conference in 2022 The Second Evaporation Crystallization New Technology Industry Development Conference in 2022 All relevant units: 2021 is the centenary of the founding of the Communist Party of China, the first year of China's "14th Five-Year Plan", and the first year of our March towards the goal of the second century. With the concept of "green mountains are golden mountains and silver mountains" deeply rooted in the hearts of the people, the construction of ecological civilization in China is developing in a high-quality direction, and China attaches unprecedented importance to environmental protection. According to the forecast, the annual market space of chemical wastewater in China is 200 billion yuan, which is nearly three times that of urban sewage. For chemical wastewater, our country has also promulgated strict wastewater salt limit discharge standards. How to treat high salt wastewater efficiently has become an urgent problem to be solved in our country. As we all know, the treatment process of organic high-salinity wastewater is complex, and the target of resource utilization and zero discharge is heavy and demanding. Under the general trend of vigorously promoting energy conservation and environmental protection, the national industrial policy encourages the evaporation and crystallization equipment industry to develop in the direction of high-tech products. Evaporation and crystallization are important technical units in the treatment of high-salinity wastewater, and they are the key technologies to realize the recycling and reduction of waste. In order to promote the application of new evaporation and crystallization technologies and equipment, save energy consumption, improve the quality of target products and solve the problems encountered in the application, the Joint Authority of Industrial Environmental Protection Network will hold the "2022 Conference on the Development of New Evaporation and Crystallization Technologies Industry" in Hangzhou from March 11 to 12, 2022. At that time, authoritative experts from relevant scientific research institutes, cbd crystallization equipment ,wiped film evaporator, senior executives of well-known enterprises and engineers and technicians will be invited to participate in the discussion and exchange. All relevant units are invited to actively send personnel to participate, and the relevant matters are hereby notified as follows: I. Contents of the MeetingNew Evaporation Crystallization Technology 1. Industrial application of low temperature evaporation technology; 2. Case introduction of MVR evaporation and multi-effect evaporation combination process; 3. Selection and maintenance of pumps, compressors and centrifuges in the evaporation and crystallization system; 4. Scale prevention measures and treatment scheme of evaporation system; 5. Application of evaporation system in waste acid disposal and recycling; 6. Selection of materials for evaporation and crystallization equipment; 7. Form, type selection and material selection details of the evaporator; 8. Application of evaporation and crystallization technology in "zero discharge" of chemical wastewater; 9. Key points of organic matter removal, particulate matter removal and grease removal in evaporative influent water; (II) Water washing fly ash saline resource reduction 1. Domestic status and direction of fly ash treatment 2. Co-processing of fly ash in cement kiln; 3. Key issues of design optimization of potassium and sodium salt separation process and separate crystallization; 4. Discussion on the new technical route of extracting sylvite; Expand the full text 5. Optimization design of equipment combination of fly ash washing and dewatering system; (III) Resource reduction of waste salt 1. Centralized disposal route of regional and park waste salt 2. The long-term operation of the dual crystallization technology route 3. Harmless disposal technology of crystallization mother liquor 4. Concentrated brine water salt crystallization recycling technology 5. Seawater desalination and evaporation device for industrial waste heat 6. High-salinity wastewater concentration treatment technology 7. Selection and maintenance of pumps, compressors and centrifuges in the evaporation and crystallization system; 8. Resource treatment technology of mixed salt and strong brine 9. Analysis of the long-term operation of the dual crystallization technology 10. Application of MVR evaporation and crystallization technology in zero discharge of high-salinity wastewater; 10. Relevant engineering cases of salt-containing wastewater and waste solid crystallization salt separation (IV) Application of evaporator in wastewater treatment of lithium battery industry 1. Characteristics of wastewater from lithium battery industry and new treatment technologies; 2. Application and case sharing of MVR evaporation crystallization technology in lithium battery industry; 3. Selection and application of steam compressor in MVR process; 4. Selection and application scope of evaporator in wastewater treatment of lithium battery industry; 5. Evaporation crystallization homogeneous multi-component separation technology; 6. Research and application of low temperature heat pump evaporation technology in lithium battery industry; 7. Common problems and solutions in the application of evaporation crystallization process equipment in lithium battery industry; 8. Feasibility analysis of MVR evaporator to realize zero discharge of wastewater treatment in lithium battery industry; 9. Application and successful case sharing of multi-effect evaporator in lithium battery wastewater treatment. II. Participants Experts from evaporation and crystallization equipment manufacturing enterprises, scientific research institutions, environmental protection engineering companies, colleges and universities, engineering and technical personnel, representatives of wastewater treatment units, chemical enterprises and power enterprises, etc. III. Time and Place of the Meeting Meeting time: March 11-12, 2022 (all-day registration on March 10) Venue: Hangzhou (registration place after registration) IV. Speech Collection This seminar will collect new technologies, case sharing and conference speeches related to the theme for the whole country. 5. Participation fee: Conference fee (including preparation fee, venue fee, expert fee, lunch, conference journal, etc.) is free for members of Industrial Environmental Protection Network and 3500 yuan per person for other units. Remarks: Please consult the conference affairs group for conference co-sponsorship,molecular distillation systems, corporate speeches, conference journal covers, inserts and other related information. VI. Contact information: Return to Sohu to see more Responsible Editor:. toptiontech.com
