The treatment plan and construction technology of the leakage of the underground integrated pipe corridor.

In the period of rapid urbanization, promoting the construction of urban underground integrated pipe corridors and coordinating the planning, construction and management of various municipal pipelines can solve the problems of repeated excavation of road surfaces, dense overhead network and frequent pipeline accidents, and ensure urban safety, improve urban functions, beautify urban landscape, and promote urban intensive efficiency and transformational development.
1
Integrated Pipe Gallery Classification
Integrated Corridor according to the pipeline it is hosting different, can be divided into trunk integrated pipe corridor, branch integrated pipe corridor, cable integrated pipe corridor (cable ditch) three.
mainline integrated corridor:
is located under the center of a motorway or road, using a separate compartment to lay the main pipeline integrated corridor, responsible for providing distribution services to the branch integrated

. It is characterized by large structure section size, deep soil cover, stable system and large transport volume, with a high degree of safety, maintenance and testing requirements.
Branch Integrated Corridor: The
Branch Common Trench is a link between the mainline integrated pipe corridor and the end user, and is located on either or one side of the road, with a single or two-cabin distribution line. It is characterized by small effective section, lower construction costs, higher system stability and safety. The section size of the pipe corridor is generally the same as that of the mainline integrated pipe gallery, and some are larger than the trunk integrated pipe corridor.
cable integrated pipe corridor (cable ditch):
cable ditch is generally buried under the sidewalk, the use of shallow buried ditch construction, with open cover but its internal space can not meet the normal requirements of personnel. Its characteristics are small space section, buried deep shallow, less construction costs, no ventilation, monitoring and other equipment, in maintenance and management is relatively simple.
2
integrated pipe gallery waterproof characteristics, difficult analysis
integrated pipe corridor as an urban underground facilities artery project for urban construction has a long-term strategic significance. The problem of leakage has always been a common problem in the quality of underground construction projects, to put an end to the long-term leakage of pipeline immersion phenomenon, to solve the waterproof problem is one of the technical problems that must be considered in the construction of integrated pipe corridor. Effectively solve the waterproof problem to ensure the construction quality of the integrated pipe ditch, but also can fundamentally reduce the safety hazards, reduce the cost of post-operation maintenance, extend the service life.
integrated pipe gallery shall be waterproof design according to climatic conditions, hydrogeological conditions, structural characteristics, construction methods and conditions of use, and the waterproof grade standard shall be level two.
water resistance should be prevented mainly, to row as a supplement, follow the "anti-, row, interception, blocking combination, according to local conditions, economically reasonable" principle.
the difficulty of waterproofing the integrated pipe gallery lies in the waterproofing of the detailed structure, including the construction seam, deformation seam, through the wall casing, through the wall bolt and other parts, if these parts are not handled well, leakage phenomenon is very common. Underground waterproof has the so-called "ten seams nine leaks" said, so it must be given sufficient attention.
Integrated pipe corridor waterproof belongs to the hidden works under the municipal road, after the road is completed and opened to traffic, can not easily dig the road to repair or repair it, therefore, after the leakage of the underground corridor, timely and correct maintenance of leakage situation becomes inevitable.
3
Underground pipe gallery roof and vertical wall regional leakage repair program
program design:
using inter-layer slurry re-engineering waterproof layer technology, indoor/or outdoor construction of job exploration holes, will repair 1 s slurry material perfusion on the outside of reinforced concrete structure, high-concentration modified asphalt refrauth waterproof layer, Re-construct an attachable waterproof film on the outer surface of the concrete structure, form a plastic filler in the concrete construction defects (cellular, void, crack), and form a creeping shrinkage at the breakage of the high-cluster waterproof coil to block the leakage channel and gradually repair the water-resistant layer of the coil.
-layer re-filling waterproof layer technology is designed to repair the waterproof system constructed by the waterproof layer of modified asphalt-based coils directly on the roof and side wall of the basement. This technology can not only effectively solve the leakage problem of underground reinforced concrete enclosing structure (top plate and side wall), but also protect the reinforced concrete enclosing structure from water erosion.
process of inter-layer pulping:
. 1. The slurry method
using the indoor construction work probe hole (injection hole), will repair the 1 syrup material in the leakage repair area reinforced concrete structure and coil waterproof layer between the pressure perfusion type of operation.
2. Perfusion cloth point
the actual project in the operation of the hole-hole cloth point to the most serious leakage area (leakage surface) center for the expansion of the initial point, plum-shaped cloth point expansion, the hole distance is generally about 3 meters, the specific hole distance needs to be determined by the field engineering and technical personnel after experimental irrigation, and can be adjusted according to the actual engineering effect.
3. Job exploration holes
creating of working holes in the interior: job exploration holes should run through the reinforced concrete structure.
work hole creation: in the leakage repair area corresponding to the outdoor part of the local excavation, the specific excavation requirements need to be determined according to the actual project situation.
4. Perfusion Control
Repair No. 1 needs to use low-pressure, high-flow grouting machine perfusion construction work, the control of the slurry injection machine exit pressure, injection flow, slurry injection total comprehensive control. The environmental pressure of the slurry head and the range of slurry diffusion were estimated by the outlet pressure of the slurry press and the amount of injection per unit time.
5. Repair effect determination
the use of inter-layer slurry re-engineering waterproof layer technology to repair the waterproof system will experience an indoor apparent leakage initial increase, and then reduce, to gradually disappear, the surface began to dry, to the wet completely disappeared process. The process of wet trace disappearance needs a certain interval, the length of the time period depends on the evaporation of water vapor in the basement, the speed of distribution to the outdoor, the length of time according to the quality of concrete good or bad, indoor ventilation conditions change, strengthening indoor and outdoor ventilation cycle is a necessary measure, in general, the process of wet trail disappearance is about 2 to 7 days, when the indoor moisture completely disappeared indicates that the repair is successful.
Note:
Repair 1 s slurry material: micron-based water milk-type high-concentration modified asphalt as a base material, mixed with a variety of alkali metal enses, made of special perfusion-type slurry material. With excellent initial fluidity, permeability, in the set environment of milk shrinking into creepy plastic solids, can be contaminated on the surface of silicate concrete adhere to impermeable film, can be collected in concrete gaps, void filling, when the condensate surface dry can be gradually restored under pressure surface adhesion and other characteristics.
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