Method for inspection well hatch manufacturing

FIELD: construction and community facilities, particularly hatches for inspection wells, underground distribution pipelines, cellars, road pavings and other structures.

SUBSTANCE: method involves installing reinforcing cage of support ring and reinforcing cage of lid in mold bottom plate, wherein reinforcing cage of support ring includes inner ring formed of sheet metal and/or profiled metal and round steel rod connected to the inner ring by means of fixedly secured partitions, reinforcing cage of the lid includes outer ring made of sheet metal and/or profiled metal, reinforcing mesh fixedly connected thereto, round steel rod and upper reinforcing mesh; pouring non-metal binding material into the mold bottom plate, wherein above round steel rods of support ring and lid are pre-stressed by heat-treating thereof before filling with binding material and by tightening round steel rods with stretchers, wherein the stretchers are made as at least 12 reinforcement posts uniformly distributed along annular rod perimeter inside thereof and rigidly fastened to mold bottom plates; providing binding material strength generation; removing the ready articles from molds and cutting projected bar ends.

EFFECT: increased strength, crack-resistance and rigidity under the action on outer vertical dynamic load, increased service life, reliability and workability duration, as well as extended fatigue limit and vehicle safety during vehicle passage over hatch.

1 cl, 11 dwg

The invention relates to the construction, utilities, in particular, to structures and methods of manufacture manholes inspection chambers, and can be used in any underground utilities, cellars, roads and various other structures.

Known inspection hatch well and the manufacturing method containing the support ring and the cover, which have a reinforcing cage filled non-metallic binder material, thus reinforcing cage support ring comprises an inner ring of sheet and/or profiled metal and rigidly United with him with jumpers steel ring rods and reinforcement cage cover consists of outer and inner rings of sheet metal and rigidly United with them steel rods forming the upper and lower belts, in addition, as the binder material used in concrete, polymer concrete, vibrostation, polymer composite materials, this cover has handles for lifting [1].

The main disadvantage of the known construction of the hatch and method of its manufacture is low mechanical strength and rigidity, and low crack resistance with application of an external vertical dynamic loads, which reduces the durability, reliability, durability and safety is viginia transport when you hit the hatch.

The objective of the invention is to increase the strength, fracture toughness and hardness with application of an external vertical dynamic loads, longer life, reliability and security of the health, endurance limits, and safety traffic when you hit the hatch.

The problem is solved by the proposed method of manufacturing the hatch observation wells, in which the reinforcing cage support ring comprising an inner ring of sheet and/or profiled metal and connected with it by using a rigid jumpers steel ring core and the armature frame cover, consisting of an outer ring of sheet and/or profiled metal and rigidly connected with it a lower wire mesh, steel ring rod and the upper reinforcing mesh, installed in the tray and pour non-metallic binder material, and the aforementioned annular rod support ring and cover used as prestressed, namely before pouring subjected to heat treatment - heat and set on the tensioner, which represents a reinforcement of the rack, the number of which not less than twelve evenly spaced within the ring terminal on the periphery and fixed in bogdonovich, upon completion of the curing of the binder material and the extraction of products from pallets-form protruding ends of the uprights cut off.

The features of the proposed method of manufacturing the hatch observation well illustrated by the drawings.

Figure 1 shows the support ring roof top view relative to its location, for example, in observation wells; figure 2 - cross section b-b In figure 1; figure 3 is an element G in figure 2; figure 4 is a manhole cover, a top view relative to its location, for example, the anchor ring on the observation wells; figure 5 - cross section a-a in figure 4; figure 6 is an element B in figure 5; figure 7 - pallet-shape to cover the hatch with fixed racks; Fig - type E figure 7; figure 9 - item D figure 7; figure 10 - pallet-form for cap installed on it reinforcing cage with fixed racks and pre-strained circular rod; figure 11 is a view W figure 10.

The proposed method of manufacturing the hatch observation wells containing the support ring (Fig.1-3) and the cover (4-6), consists of fabrication of reinforcement cages, making prestressed reinforcing steel circular rods, casting non-metallic binder material and curing, and trim the protruding ends of the tension struts. As a non-metallic binder material used be is he, polymer concrete, vibrostation, polymer composite materials.

The support ring has a hole in which an internal circuit is the support belt 1 made, for example, from the rolling angular equilateral angle steel according to GOST 8509-72, collapsed in the ring. Reinforcement cage support ring comprises an inner ring 2 of the sheet and/or corrugated metal, rigidly connected with the supporting belt 1 (for example, by welding at least 12 points, evenly spaced around the diameter with the length of the seam is not less than 30 mm). Outside the ring 2 is rigidly fixed to the ring 3 from round reinforcing steel (for example, by welding at least 12 points, evenly spaced around the diameter with the length of the seam is not less than 30 mm). To the ring 3 and the supporting belt 1 is rigidly by welding fixed jumpers 4 and 5, which are arranged radially and rigidly connected (welded) to each other, at least 12 pairs, evenly spaced around the diameter. Closer to the periphery of the support ring evenly in diameter are supporting tension 6 hours of round hot-rolled reinforcing steel in the amount of not less than 12 units and a minimum diameter of 14 mm, an Outside stretch racks 6 based on radial jumper 4 is a steel ring shank 7, which is pre-strained.

Manhole cover observation well has peripherin the Yu conical bearing surface and the armature frame. The armature frame cover comprises an outer ring 11 having the shape of a truncated cone, of a sheet and/or profiled metal and rigidly connected with it by welding the bottom of the wire mesh, consisting of mutually perpendicular reinforcing rods 12 and 13. Uniformly in diameter are supporting the tension of the rack 14 of round hot-rolled reinforcing steel in the amount of not less than 12 units and a minimum diameter of 14 mm, an Outside stretch racks 14 supported on the lower reinforcing mesh is a steel ring shank 15, which is pre-strained. The top (according to figure 5 and 6) on the ring core 15 is set to the upper reinforcing mesh. The lid has two through holes for lifting and for ventilation of the well. On the peripheral surface of the cover is welded to the retainer 16 and the support ring has a slot under the latch.

Consider the proposed method on the example of the manufacture of the cover, meaning that the production of a supporting ring in the same way. For the manufacture hatch observation wells required to produce a rigid structure of the pallet-form 17 (Fig.7-9), with holes for installation and fastening of the tensioning struts 14 with the sleeves 18 and screws 19. To move pallet-form it is equipped with keyhole mounting tabs 20. After you install the tension racks 14 to the desired height and Zhestkov the fastening them with screws 19 on the pallet-form 17 is installed reinforcement cage of the outer ring 11 and the lower wire mesh, which is centered relative to the tension of the uprights 14 by the flange 21 located on the upper surface of the pallet-form 17 (figure 10). Then installed the steel ring shank 15 so that the tension of the rack 14 to be inside that ring rod, with the ring terminal preheated and its circumference maximized. Heating of the annular core made of reinforcing steel class V, implement, for example, on the electrical installation. The recommended temperature to 400°C. the Elongation ring rod, for example, the length of 1852 mm, forming a ring with a diameter of 590 mm, is 69 mm In the heated ring rod is freely worn on the stretch rack and cool to room temperature ring terminal 15 is in a state of stress, perceived tension struts 14.

After driving concrete or other binding material and its compaction (for example, on the shaker) the product is gaining strength together with the pallet in the heat treatment chamber. Only at the end of curing, the product is recovered from the tray, pre-loosening the screws 19. The final operation in the technological process of manufacturing the cap is cutting the protruding parts of the uprights 14.

Thus, long before the concrete within the limits of elasticity and WWS is held against the tension devices after concreting and acquisition of concrete of adequate strength (usually about 70% of required) o-ring rod tends to return to its original condition and compresses the concrete. When this ring rod being in contact with the rack, cover the compressive stress at the roof height equal to the height of the uprights [2].

Prestressed design of the cover and the support ring of the hatch observation wells produced by the proposed method have the following advantages:

- security against premature cracking - cracking;

- the possibility of rational use of high strength steel and a binder material (e.g. concrete) and, as a consequence, the economy of metal and facilitating mass structures (30%);

- increased stiffness is smaller deflections that result from the absence of hairline cracks and the presence of elements (bending) deformation obtained in the preliminary voltage, opposite in direction to the deformation of the load;

- durability of structures - again thanks fracture toughness at service loads;

higher fatigue limit, caused by a slight fluctuation of stresses in the tensile reinforcement under repeated load.

Sources of information

1. RF patent for useful model No. 32141, IPC⁷E02D 29/12, 29/14, E03F. Inspection hatch well. Korotkov, A.A. Application No. 2003106252/20; 07.03.2003; 10.09.2003. Bull. No. 25 - a prototype.

2. Sakhnovskaya C.V. reinforced Concrete design the work. Ed. 2nd, Rev. M: Gastrolyzer, 1961. S-376.

A method of manufacturing a manhole observation wells, in which the reinforcing cage support ring comprising an inner ring of sheet and/or profiled metal and connected with it by using a rigid jumpers steel ring core and the armature frame cover, consisting of an outer ring of sheet and/or profiled metal and rigidly connected with it a lower wire mesh, steel ring rod and the upper reinforcing mesh, installed in the tray and pour non-metallic binder material, characterized in that the said annular rod support ring and cover used as prestressed, namely before fill is subjected to heat treatment - heat and set on the tensioner, which represents a reinforcement of the rack, the number of which not less than twelve evenly spaced within the ring terminal on the periphery and fixed to the pallet-forms, while at the end of the curing of the binder material and the extraction of products from pallets-form protruding ends of the uprights cut off.