SU1129278A1 - Method and apparatus for rendering monolithic a massive concrete structure - Google Patents

Abstract

1. A device for monolithing a massive concrete structure containing placed in a structure /// // Z / 7 ////////. ut.i research institutes injection channels with outlets, characterized in that in order to reduce labor costs, injection channels are designed as cylindrical horizontal channels located along the building in height, and outlets are formed by temperature-shrinking cracks diverging from the cylindrical cavities of the channels. 2. A method of homonolishing a massive concrete structure, including concreting the structure, the formation of injection channels and sleeves and feeding into the channels in the cement mortar, characterized in that, in order to reduce labor costs, injection channels form during the concrete concreting process, and the outlets - after concrete concreting .

Description

The invention relates to the construction of massive concrete structures, mainly dams. A device for monolithing a massive concrete structure, including vertical wells passing from the surface fl 3, is known. The drawbacks of this device are the high costs of drilling, the wells and their low performance due to the fact that during drilling of a well their walls are sloped and the slurry overlaps (putty fractures intersected (intersected by wells. Subsequent flushing of wells with water does not allow the removal of sludge that clogs the cracks. A method of homonolishing of a massive concrete structure nor by drilling vertical wells. The disadvantage of this method is the large labor costs for drilling wells. A device for homonolishing massive concrete structures containing injection channels placed in a structure is known.} The disadvantage of this device is the high costs of injecting injection channels and the release, as for ensuring the operation of the releases, they are installed on pre-arranged (fixed surfaces, the fixation of which requires making seams across the axis of the dams You need to install costly formwork between adjacent concreting sections (pillars) to obtain such transverse joints. A method of homonolishing a massive concrete structure is also known, including concreting the structure, forming injection channels and outlets, and feeding the channels into the cementitious substance L2. The disadvantage of this method is the high cost of its implementation. The purpose of the invention is to reduce labor costs. The goal is achieved by the fact that, in a device for the monolithic casting of a solid concrete structure, including injection canals placed in the building, injection canals are made in the form of cylindrical horizontal canals located in Russian in height along the structure, and the outlets are formed by temperature-shrinking cracks diverging from cylindrical cavities of channels. According to the Method of monolithing massive concrete structures, injection channels are formed during the process of concreting the structure and doubles after the concreting of the structure. FIG. 1 shows a dam, a transverse section; in fig. 2 shows section A-A in FIG. 1. The device includes injection channels 1 and outlets 2 located in the building 3. Channels 1 are made in the form of cylindrical cavities in concrete located along the buildings of Rus. The dimensions and number of channels and their channels, as well as their direction in the plan, are chosen in each particular case on the basis of calculations depending on the parameters of the structure and the pressure applied to it. If the structure has a large width at which temperature-shrinkage cracks can form, only transverse, but also longitudinal (i.e. in the direction of the axis of the dam), in addition to the above-mentioned longitudinal channels, they also arrange transverse, directed along the normal or at an angle to the axis of the dam. The outlets 2 are formed in the form of temperature-shrinkage cracks in the concrete of the structure 3, which intersect the cylindrical cavities 1. The method is carried out as follows. The formwork is installed along the upstream and downstream sides of the dam, the concrete mixture is laid in continuous layers over the entire area of the dam from one bank to the other, while the injection channels 1 are made horizontal along the entire dam in several places along its height. The walls of the channels must be concrete in the body of the dam; therefore, the channels are formed, for example, by means of recoverable cavity-forming agents consisting of rubber-fabric hoses that, under pressure from the filling water of the hose, can increase their diameter by 10-15%. After curing the concrete

3

mixtures of water from the sleeves are released, their diameter is reduced by the force of elasticity, and the sleeves are removed for later use.

Due to the absence of intersection joints in the concrete of the dam, vertical cracks appear, forming plugs 2, perpendicular to the dam crest, caused by temperature and shrinkage deformations.

292784

After completion of the construction, and after the opening of the cracks reaches a maximum value, the outcrops of the cracks are sealed to the exposed surfaces of the dam, for example, by caulking (putty) with cement mortar on the expanding cement. Then, the construction is monolithic by cementation of trowels by known methods through the aforementioned channels in concrete f

Claims (2)

1. Device for monopolizing a massive concrete structure, 1980, p. 290 CONSTRUCTION MONITORING ·. injection channels with outlets, characterized in that for the purpose of reducing labor costs, injection channels are made in the form of cylindrical horizontal channels located along the structure, placed in a tier in height, and the outlets are formed by heat-shrinkable cracks diverging from the cylindrical cavity of the channels. 2. The method of monolithic massive concrete structures, including concrete structures, the formation of injection channels and outlets and the supply of cement binder into the channels, characterized in that, in order to reduce labor costs, injection channels form the structure during concreting, and the releases after concrete