Shenyang tunnel plugging welcomes your service hotline: 13961999789 Mr. Zhou in concrete construction, seepage treatment expansion joints, construction joints and temperature stress fracture is a worldwide problem. To the maximum extent possible to reduce the incidence of concrete during construction of various cracks in the concrete construction process now, even though we in the selection, terms of the construction process of its raw materials are carried out constant research and improvement, however, can not completely be avoided, such as in Three Gorges, Xiaolangdi, and Wanjiazhai water conservancy and hydropower and other large and medium projects, although the use of a variety of construction technology, strict quality assurance system and control measures, but in concrete construction are found in varying degrees various cracks generation. Concrete various cracks produced, not only in their structure had a negative impact on the entire building may also have a direct harm, especially hydraulic structures, due to the generation of cracks in the concrete, such as the underwater part located Cracks can cause water leakage along cracks, crack above the water line, and is due to repeated changes in temperature, so that the cracks in the structure of capillary water to cause further damage, which may result in damage to the structure of matter. Chemical grouting is a very effective method of concrete construction defect process. Chemical grouting methods described herein, it is possible for different fracture types, using their different treatment process, not only reduces the labor intensity of the construction process, but also to ensure that the defect processing quality, shorten the construction period, lower processing costs, thereby obtaining good economic and social benefits. Second, the defects of the type of concrete cracks and water seepage defect general concrete cracks appearing are: expansion joints, construction joints, thermal stress cracks. 2.1 joints: It is arranged according to the lateral seam structure, geological conditions and construction layout, construction strength set in the structure, in order to meet the requirements of structural deformation, among seam surface generally should not have a rigid filler, just upstream of the dam sealing surface facilities located nearby. During operation, the water seepage because of the following two aspects: a, the original construction process, due to various causes damage sealing sheet; b, groundwater along the sealing piece formed part of concrete seepage around the defective portion. 2.2 Construction joints: Another seepage seam is horizontal concrete construction joints, the main reason for water seepage, did not seek to carry out joint surface treatment, concrete pouring process less binding mortar and concrete materials at high altitude, resulting in partial separation of mortar and concrete aggregate, and insufficient regional vibrated along part of the joint surface, causing part of the seepage channel. 2.5 Temperature stress cracks: cracks in concrete up to that temperature stress cracks in the construction process due to the temperature difference between the foundation and concrete inside and outside temperature difference is too large or due to other causes of stress relief and so is the main concrete temperature stress cracks. According to temperature stress cracks different forms of expression, thermal stress cracks can be divided into surface *, deep, penetrating three. General principles 2.4 crack treatment based on fracture type and location different from their processing methods are different, the concrete crack treatment should follow the following principles: a. Surface weathering, seepage, erosion, abrasion resistance requirements should be part of the fracture surface treatment. Over the years the company is willing to extensive construction experience plugging, first-class technology, first-class management, first-class service for the various owners of service and dedication to provide the most satisfied with the best, most worry about the benefits of products for the domestic and foreign customers. I. Project Overview City of Grandview Plaza PARKnSHOP basement built for years, affected by a variety of reasons, some local produce leakage. Affect the normal use of the building. Now for the actual site of the leaking portion of the concrete body grouting plugging construction specific construction program. for selection. Second, the construction program The field observation to understand, concrete slab reason seepage occurs, trachoma or cracks appearing along the channel leaking concrete panels. Our company based on years of construction experience, decided to adopt its construction chemical grouting method, the leakage blisters or cracks channel blocked, to plugging purposes. ? 1. The selection of materials for this type of leakage current can better plugging reinforcement materials are two types, one is the middle of the "656" class of chemical wood pulp, the material with water, excellent construction performance; Another material is a polymer grout HY high that the material strength, excellent adhesion. Sinochem "656" class of chemical pulp material has the following characteristics: ① small viscosity of the slurry having a viscosity of 1.2CP, and before curing cement has remained the same, so it has good permeability, under pressure to reverse poured leakage channel, full passage, and consolidation leakage passage blocked, so that the original leak site no longer leaking. ② consolidation plugging material can be accurately controlled in the range of tens of seconds to several minutes, consolidation occurs and instantaneous. Good ③ body impermeability plugging consolidation, permeability coefficient of 10-9 ~ 10-10cm / s. ④ concretion body durability, long-term use, does not pollute the environment. ⑤ concretion body from bacteria, acid and alkali erosion. ⑥ concretion body has good flexibility, water micro-swelling, can prevent recurrence of leakage fracture deformation. HY polymer grouting material has the following characteristics: ① bonding method can crack the chemical grouting, bonding defects, but also low-grade mortar can penetrate body reinforcement, to achieve concrete body to improve the effect of the label, which has excellent adhesion knot capability, strength and sealing performance of water. ② protection of concrete reinforced body, the slurry bond reinforced with concrete along loosening, to defect penetration, because this polymer material is also a good anti-corrosion materials, therefore, able to protect steel and concrete reinforcement and increase body double bonding effect. ③ different body types of concrete cracks, defects bonding, filling the cracks in the concrete bonding method, the defect has a wide range on the bond, can be bonded to a few centimeters big big cracks, expansion joints, less than 0.02mm minute cracks. ④ opening and closing of dynamic load changes Fix: can be bonded to the concrete grout body is in dynamic load opening and closing the case, such as the railway bridge unabated load operation is carried out warranty. ⑤ serious damage to the cracks in the concrete, loose bond defect repair: the use of grout may encounter resistance, high permeability, such as fire break repair more serious concrete body. ⑥ Temperature range: for concrete cracks, the adhesive material defects in long-term use in the range of -20 ~ 80 ℃. ⑦HY grouting material body reinforced concrete, high strength, good permeability, curing time can be adjusted, the mechanical properties of the material as follows: In this project, the construction will be based on the specific circumstances, the use of these two materials, a single or two kind used in conjunction with optimum sealing effect. 2, the construction process ①, clear the area: in order to find the leakage area. ②, look for leaking parts: a close look at the cracks and leaks leaks concrete panels in open water seepage at the concrete surface with a hammer, showed observe water seeping path in order to accurately open leaking concrete surface. ③, laying filling the mouth: scuttling leakage area, and try to find sources of leakage, according to a certain distance and then buried filling the mouth. ④, slurry preparation: according to project needs, the deployment of the relevant material as the main agent and a curing agent of the two components, and adjusting the setting time and the consolidation of good strength slurry. ⑤, filling: mouth filling material to be buried after a certain intensity, can be grouted. After the deployment of the good at filling the main agent and the curing agent were mixed by a certain percentage, using a special grout pump immediately after mixing, mixed slurry poured into the mouth from the filling of cracks in the leakage area until slurry solidification, namely filling the mouth can be carried out under a grout. Filling should regulate the setting time of the slurry to ensure that the slurry can be poured into the entire fissures and cracks can pass through the consolidation of sand along fissures and cracks outside. Both to protect the closed steel, and can greatly improve the effectiveness and long-term sealing. ⑥, sealed tube and surface treatment: After filling spout closed with cement mortar smooth the nozzle. ⑦, the above process is completed, re-examination and found a slight seepage secondary place, repeat the above construction process until no leakage. Third, the construction organization and quality assurance measures 1, the construction team reinforced by a rigorous professional and technical training waterproof, and have some practical experience in construction staff induction operation, known as the structural characteristics and practices of nodes details. 2, the construction team captain facility worker who is responsible for the overall construction, technical quality supervision and inspection of the construction process and to coordinate the work with the construction side. 3, the use of materials of construction quality should meet the design requirements. 4, leaking pipe to find the source, make sure the water from the source block, reducing rework. 5, when filling the slurry into the interior to make the leakage path, to ensure consolidation of the slurry body has sufficient depth and thickness. Fourth, safe and civilized construction measures 1, the construction of temporary facilities, materials piled up, etc., should be disposed of in accordance with the Party designated site. 2, before the official start, safety regulations must be carried out before entering the work of education workers. 3, in strict accordance with the construction practices for construction. 4, pay attention to the dormitory, factory hygiene, so civilized construction. 5, pay attention to fire prevention, strengthen fire inspection, to prevent fire hazards. 6, flammable materials and other chemical materials to be unified neatly stacked, to prevent others from misappropriation. 7, strict compliance with rules and regulations within the facility, subject to leadership and management. Shenyang tunnel plugging Welcome