□ Sun Puyu Wenxiong Zhu Feng
↑ Party members went to the national "pioneering and striving for excellence" demonstration village - Jiang Village under Maple Ridge in Chun'an County to study
Core reading
In Kaihua County, Quzhou City, located at the junction of the three provinces of Zhejiang, Anhui and Gansu, the mountains and rivers are intertwined, the valleys are narrow and steep, and the Qiantang River originates from here. The majestic mountains are undulating, and the forest coverage rate of the county town has reached 80.7%. The Jiujingqu Railway enters Zhejiang from Jiangxi, passing through mountains and mountains from here, and also opens a new chapter in the history of the railway here. The 24th Bureau of China Railway undertook the construction of the Zhejiang section I bid, and its subordinate Zhejiang Company formed a second branch, which played a pioneering role in the construction of the Zhejiang section of the Jiujingqu Railway. ‘’
↑ Carry out an emergency rescue drill for tunnel collapse
Rise to the occasion
The length of the Zhejiang section of the Jiujingqu Railway is 11.46 kilometers, of which 9 tunnels total 7.1 kilometers, 8 bridges with a total of 2.47 kilometers, and 15 subgrade sections totaling 1.89 kilometers.
According to the survey data of karst tunnels in the Zhejiang section of the Jiujingqu Railway, 14 karst tunnels are among the 23 tunnels, and 9 tunnels in the I standard two division are all listed among them. In addition, the Yanglin Tunnel and peiling No. 2 tunnel are suspected of having gas.
All bridges undertaken by The Second Division are located in karst developmental areas. Although the bridge is not long, only 977 meters, and there are 27 piers, the drilling results show that there are 26 caves of different sizes under the piers. The caves between piers 8 and 20 are dense, and some are strung together like sugar gourds. In the process of bridge drilling pile construction in karst areas, it is very easy to collapse holes, card drilling, buried drilling and other phenomena, which not only threaten construction safety, affect the quality of the project, but also restrict the progress of the project.
In addition to karst development, pier No. 12 to No. 18 across the Hangzhou Xinjing Expressway Special Bridge is still a paleohe channel, a layer of nearly 6 meters thick pebbles are loose as loose sand, drilling piles are easy to collapse holes, light buried drill bits, heavy cause the pile machine foundation to collapse. The rock formation under the bridge is hugely undulating, with Pier 9 piles only more than 20 meters long and Pier 8 piles more than 60 meters long.
Upon learning of these circumstances, some people in the Second Division retreated.
Project manager Rui Brave said: "Difficulties are the way, you can't be afraid, as long as you do it, you won't be afraid if you do more." As the saying goes: "Is it difficult or easy to do things in the world?" For this, it is easy for those who are difficult. "Shout out your throat, it's better to shake off your arms." At the branch production meeting, he called on everyone to face the difficulties and fight steadily.
In view of the problems of shallow burial of tunnels in the project, rapid change of surrounding rock, multiple caves and bridges spanning the Hangzhou Xinjing Expressway under construction, the branch set up 4 division points and purchased tools such as gas detectors.
Zuo Songting, chief engineer of the branch, organized technical personnel to learn technical specifications together, repeatedly optimized the construction plan, submitted it to the company, the bureau headquarters, the supervision and the owner for multi-party review, and actively consulted experts from Southwest Jiaotong University and the Iron Research Institute for advice. After full preparation, the team of the second division was riveted and sounded the charge, and on March 15, 2014, the construction began ahead of the other divisions.
Step by step to get through the difficulties
"Zhou Yi Qian" has a saying: "A gentleman works hard all day long, and if he is fierce, there is no blame." "Be careful, as in a situation of danger, and not slacken off, so as to avoid evil." This is especially true of participating in high-risk project construction. "Never sacrifice safety to rush the progress!" This concept has been deeply rooted in the minds of everyone in the project department and practiced in every aspect of engineering construction.
The division adopts the method of exploration and irrigation combination of karst roadbed, and 30% of the pore positions are extracted for pilot hole exploration and perfusion. When the roadbed grouting, technical supervisor Zhu Hongbin has been hanging his heart, he recalled: "One day in September 2014, the grouting pressure gauge suddenly did not respond, and normal should be falling. We suspended the construction, an interval of one night, or the same situation, quickly filled the glass with quick-setting agent, and filled the sand. ”
The construction of karst drilled piles is very difficult, and Tong Feng, deputy minister in charge of bridges in the Engineering Department, has a deep understanding: "The drilled piles that are usually constructed for two days will take more than 5 days to construct when they encounter a cave, and some even up to 10 days." "The pile foundation of Pier 8 of the Special Bridge across Hangzhou Xinjing Expressway is 64 meters long, the construction is more complicated, and there is a jam hammer when playing pile 11, which really makes the project department staff nervous." They repeatedly studied the drawings and the actual situation on the spot, and chose to combine the throwing and filling method with the steel cylinder follow-up method, and finally controlled the unfavorable situation.
In order to cope with the situation of caves and gas encountered in tunnel construction, Wei Wei, minister of engineering, specially bought professional books, immersed himself in research, and mastered the knowledge of geological advance forecasting, construction organization, hazard source identification and emergency plan. He also found supervisors and designers with rich experience in this area to seek advice and explore and improve technical management measures together.
In order to strengthen the safety and quality control of tunnel construction, the project department erected warning signs at each tunnel entrance and announced the contents of the "Nine Provisions on Tunnel Construction Safety" to all tunnel staff. The safety sword hangs high above the head, and the on-site construction is carried out step by step.
The first karst tunnel encountered by the division was the Camphor Wood Tunnel. On January 4, 2015, when the tunnel was excavated to the mileage DK240+041, a small area of the arch wall on the right side of the palm face collapsed. This section was originally designed as a grade III .b surrounding rock, and Wang Hao, the technical supervisor, immediately reported to the leader of the branch, contacted the on-site design team to come to investigate, and changed to IV .b level for support. On January 8, a karst roof erupted on the right arch of the palm face. After the project department took measures such as piling sandbag retainers, backfilling the hole slag, and sealing the sprayed concrete, it set up a hole pipe shed and injected cement slurry. After the collapse cavity section is treated, the advance pre-support adopts a small catheter, and the initial support and secondary lining are constructed according to the Vb grade surrounding rock, and finally pass through this section safely.
In July 2015, after several days of heavy rainfall, the karst roof of the DK243+170 section of the Peiling No. 2 Tunnel was excavated, and the tunnel excavation had passed through the shallow burial section. However, Zhang Guohua, deputy manager and safety director in charge of the tunnel, was pleased: "With the actual combat experience and technical exchanges of the Zhangshuwu Tunnel in front, the on-site management and operators handled such problems more calmly and skillfully." He took the tunnel supervisor Wang Qingchao and others to arrange for the operators to grout on the slope of the roof and backfill the hole. The contact design team changed the surrounding rock grade of the subsequent 45 meters to Vb level, and the construction method was changed to a three-step temporary upward arch method.
"Meritorious service, extensive and diligent work." The morale of the project department personnel was high, they worked hard, broke through the siege when the difficulties were at the top, and fought a beautiful battle.
On September 29, 2015, the 24th Bureau of China Railway held a tunnel construction technology exchange meeting at the Zhejiang section I of the Jiujingqu Railway. At the exit of the Yanglin Tunnel at the "standardized construction site", Rui bravely explained to more than 60 people who came to visit the measures and accumulated experience through shallow burial and karst sections under the condition of crushing of surrounding rock, joint development and large risk of gas.
Strive for excellence and build fine products
"If you are poor, you will change, if you change, you will be general, and if you are poor, you will be long-lasting." Only by changing according to the situation can we promote development and achieve outstanding results.
During the construction of the cobblestone layer of the original ancient river channel across the Hangzhou Xinjing Expressway Special Bridge, the water flow of the foundation pit of the pile was large, and multiple high-power pumps were required to pump water together to carry out the construction of the pile. No. 15 and No. 16 pile construction, even with more than 10 high-power pumps to pump water is difficult to dry. In the case of the steel sheet pile can not be beaten, the sandbag cofferdam effect is not good, inspired by the Zhangshuwu tunnel collapse treatment plan, the project department adopted the method of grouting around the foundation pit to fill the pebble gap, which is both economical and practical, and provides a guarantee for the smooth completion of the pile construction.
In the process of construction of the exit of Zhangshuwu Tunnel, there is a section of about 800 meters of II. and III. surrounding rock, and the project management personnel and the operation team discuss together to strengthen the control of ultra-under-excavation, and improve the excavation method, using methods such as increasing the detonation cable, reducing the distance between the surrounding eye holes, and drilling the drilling hole on the lower stage of the excavation pad to ensure the direction of the drill hole, etc., and achieved good results of smooth surface blasting.
The entrance of Zhangshuwu Tunnel and the exit of Peiling No. 1 Tunnel were originally designed as CFG piles to reinforce the foundation, which was small in number and high in construction cost. The project department actively contacted the design team, and after a site survey, it was optimized for a concrete refill scheme. This not only saves costs, but also greatly facilitates construction and accelerates the progress.
If a worker desires to do a good thing, he must first use it. The project department improved the construction process of the trench cable channel and used a monolithic trolley. The traditional way of construction tunnel ditch, cable trough, need to assemble the formwork, generally take a day and a half to pour a gear, the formwork needs to be placed after demolition, affecting other processes of construction. The template of the trench cableway integral trolley is an integral steel mold, high strength, not easy to deform, to ensure that the cable trough as a whole is straight, can be poured 1 gear per day, and does not occupy the vehicle passage in the tunnel, the construction surface is clean and beautiful. They also purchased a number of small machines such as hair chiseling machines, waterstop belt hot melt welding machines, waterproof plate infrared hot melt welding machines, and advanced horizontal drilling rigs, which were promoted and applied at various work points.
In terms of quality control, the project department strictly implements the first piece acceptance system for tunnel construction, anchor support, waterproof plate hot melt welding, upward arch bottoming, bridge engineering steel spacing, prestress grouting, subgrade filling and compaction, particle control, etc., and establishes a problem library sales number system to achieve on-site control without dead ends. Unified standards such as foundation pits and pier scaffolding are protected, which effectively improves the level of on-site safety and quality management. Fang Chao, minister of the Ministry of Safety and Quality, led his apprentice Huang Zhi to conscientiously carry out daily safety and quality management in the form of safety inspections, special inspections, and weekly inspections with supervisors, and urged the operation team to rectify the hidden dangers found in a timely manner. The test results of the partial drilling pile are all qualified, and the construction period delayed due to the cave treatment is also controlled, which effectively avoids a large number of repeated leakage of slurry in the same cave.
Meritorious donation, Yuru Yucheng. The efforts of the second division of the project will eventually be rewarded. The key project of the tunnel construction QC team "Tunnel Construction Control through Karst Geological Section Quickly and Safely" won the second prize of Excellent QC Achievements in Zhejiang Province. The exit of Yanglin Tunnel was awarded the "Standardization Site Winner Cup" by the Shanghai Railway Bureau, and the continuous beam of the Trans-Hangzhou Xinjing Expressway was awarded the "Standardized Site Model" of the Jiujingqu Railway Zhejiang Company.
Culture leads to the gathering of people's hearts
A successful project must be supported by an excellent management culture.
At the beginning of the project, Qian Jianzhong, executive director and general manager of Zhejiang Company, and Chen Ming, secretary of the party committee, unanimously stressed that the water is not exciting, the people are not excited, and it is necessary to increase the intensity of labor competition and promote the construction and production of the project; to touch people with sincerity, people should also respond sincerely, and the company, the project department and the labor service team need to abide by integrity, deepen cooperation, and achieve a win-win situation.
It is precisely under the nourishment of this labor competition incentive culture and the culture of honest cooperation and win-win cooperation that the second branch of the project attacked the city and led the way, enjoying the reputation of Jiujingqu.
In June 2014, the second division set off a monthly labor competition boom, refining the production progress targets of each work site, strict assessment, heavy rewards and heavy penalties, and fully mobilizing the enthusiasm of the staff of the project department and the operation team. In the same month, the longitudinal sidewalk of the special bridge across the Hangzhou Xinjing Expressway began as scheduled, and Wu Jun, secretary of the party branch of the branch, and the early personnel received a total reward of 5,000 yuan; Shen Youchuan, deputy manager, and two technical supervisors were rewarded for the excavation of the exit of the Yanglin Tunnel, and the tunnel operation team was awarded 50,000 yuan; while the peiling No. 2 tunnel import did not complete the original planned task, and the operation team was fined 25,000 yuan.
True rewards and real punishments allow the latecomers to catch up with the advanced, and let the advanced move forward. Since 2014, the work of land acquisition and temporary borrowing, team entry, project promotion, safety and quality management, and technological innovation of the second division has been far ahead of the four divisions of the project department.
At the beginning of 2015, Rui Brave proposed the "work point supervisor responsibility system" of each of the 10 technical supervisors of tunnels, bridges and subgrades, which was recognized by Tao Jianguo, deputy general manager of Zhejiang Company, and implemented in the branch, which not only promoted the construction and production of the climb, but also greatly improved the ability of the branch management personnel to tackle the tough problems.
"The construction climax was reached in April 2015 and the momentum of the project has been maintained." Rui Yongyong said in the annual debriefing report that the annual output value of the branch was 290 million yuan, which was close to half of the contract cost.
In the early morning of September 28, 2015, they completed the pouring of continuous beams across the Hangzhou Xinjing Expressway, becoming the continuous beam of the first joint dragon of the Zhejiang section of the Jiujingqu Railway; in the early morning of December 29, 2015, the continuous beams across the cave (49.2 + 80 + 49.2) meters were successfully completed, so far, the main project of the cross-Hangzhou Xinjing Expressway Special Bridge was successfully completed; on August 10, 2016, the Zhangshuwu Tunnel broke through, marking the safe and smooth breakthrough of all 9 tunnels in the division.
If the culture of incentives for labor competition is a major engine for the success of projects, then a culture of win-win cooperation in good faith provides a strong impetus for the engine.
The second division invited the construction team to participate in the regular safety and quality meeting of the project department, conducted regular safety education and training for the newly hired operators, issued process quality control cards, and signed the "Construction Safety Responsibility Letter" and "Quality Commitment Letter" with the labor team. The external labor team is regarded as a partner with shared responsibilities and benefits, and it is fully integrated into the project management process, which effectively improves the level of on-site management. At the 2015 Labor Service Operation Team Symposium held by Zhejiang Company of China Railway 24th Bureau, the Yanglin Tunnel and the Special Bridge Operation Team Across Hangzhou Xinjing Expressway were rated as excellent and were solemnly commended.
During the tunnel construction, the project branch adheres to the system of on-site shifts by members of the leadership team and heads of departments. During the shift, two people who are proficient in tunnels and tunnels with less experience are deliberately formed into a class, which not only ensures that the on-site problems can be solved in a timely and effective manner, but also trains more tunnel technical management talents for the enterprise.
The party branch of the project focuses on party building around production, grasps party building and promotes production, actively carries out the "three strict and three realistic" special education, strengthens the "two studies and one doing" study and education, lets party members and cadres take the lead in labor competitions, and lets party members and cadres shine their identities and set an example in honest cooperation, ensuring that the safety, quality and progress of the project are orderly and controllable. The party branch also organized party members to study in Xiajiang Village, Maple Ridge Town, Chun'an County, a national demonstration base for "creating the first and striving for excellence", and organized activities such as collective movie watching, red education, and festival celebrations, which not only enriched the spiritual and cultural life of cadres and workers, but also improved team cohesion.
In 2014, in the monthly evaluation of the four divisions by the Zhejiang Section Headquarters of the 24th Bureau of China Railway, the second division won the first place 7 times. In the 2015 credit evaluation and evaluation of the owners, the project department of the 24th Bureau of China Railway won the first place in the first half of the year and the first place in the second half of the year, and the second division ranked first in the comprehensive ranking of each division.
"Stand on the tide and keep the red flag in your hand from getting wet." The brave do not shy away from the difficulties and dangers to fight the wind and waves, and stand majestically in the turbulent tide. When the rocks suddenly changed and the waves that were blocked by the obstruction of work rose and fell, the construction team of the I Bid Ii Branch of the Zhejiang Section of the Zhejiang Section of the 24th Bureau of China Railway stepped on the waves and stood on the waves, walking dangerously and showing a real brave demeanor.