CN2044310U

CN2044310U - Wrapped cement pressur pipe with antiseep layer

Info

Publication number: CN2044310U
Application number: CN 88218679
Authority: CN
Inventors: 曾民先
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-12-08
Filing date: 1988-12-08
Publication date: 1989-09-13

Abstract

The utility model relates to a wrapped cement pressure pipe with anti-seep layer which is mainly used as the pressure pipes of the hydraulic power plants. Glass fibre reinforced plastics or light gauge sheets are taken as the anti-seep layer, and high-strength carbon steel wires are taken as the circular-wrapped layer, and the utility model is made up of a high-strength cement sand bed [2], a middle cement sand bed [3], a circular-wrapped layer [40361, and a cement sand bed protective layer [5]. The sealing device at the interface seam of the pipe union is composed of a rubber hollow pipe [6], a rubber plate ring [7], a steel plate ring [8] and an epoxy resin cement sand bed [9]. Factories or site pre-casting productions and professional installations are available. The pressure pipe of the utility model has the advantages of high strength, strong anti-cracking and anti-tarnishing performance, light in weight and no leakage. The utility model can be installed on the continuous saddle-shaped concrete pedestal, and the utility model which is with medium stiffness can resist the bending and destabilization causing by external pressure. The utility model can replace pure steel pipes so as to save rolled steels and decrease fabrication costs.

Description

Wrapped cement pressur pipe with antiseep layer

The utility model belongs to a kind of wrapping wire cement pressure tube of making impervious barrier with glass fibre reinforced plastics or sheet metal.Be mainly used in the pressure tube in water power plant.

Pressure tube is the weight constituent element of Hydropower Project, bear very big hydraulic head pressure, does not allow big crack and leaks and the disrepair phenomenon generation.The pressure tube of prior art is generally concrete reinforced pipe, ferro-cement pipe and steel pipe.Concrete reinforced pipe can be gathered materials on the spot, and shortcoming is that tube wall easily produces the crack, and the corrosion reinforcing bar that causes seeping water is so generally can only be used for the pressure tube in head power station below 50 meters.The ferro-cement pipe is newer a kind of, and is light with the concrete reinforced pipe weight/power ratio, can prefabricatedly produce, and lifting is convenient, and shortcoming also is easily to produce the crack, and the corrosion steel wire that leaks generally only is used for the minor diameter pressure tube.Steel pipe is that present high head hydroelectric power plant adopts maximum a kind of pressure tubes, and the intensity height is impervious durable, but shortcoming one is to cost an arm and a leg; The 2nd, do not give full play to the high advantage of steel tensile strength, because steel tensile strength height, it is best being used for resisting the hoop tensile stress, but it is upright that the invar pipe generally is a frame, in the effect of axially wanting beam, cause the structural stress complexity, and genus thin-shell construction, be opposing external pressure unstability, opposing is corroded, and will thicken tube wall in the design, and add a lot of stiffening rings, supporting ring, slip joint, buttress and support rolling structure etc., the high advantage of steel tensile strength is not fully exerted, causes waste.In addition, steel pipe manufacturing and the strictness of lifting operation complex process, regular paint in service and maintenance load are big.

The purpose of this utility model is that a kind of new pressure pipe in hydraulic power station will be provided, to replace the clean steel pipe, have intensity height, anti-leakage, durable, resistant to rust and advantages such as enough rigidity are arranged, can save steel in a large number, reduce cost, and have batch production or the on-the-spot condition of production line prefabricated production pressure tube coupling and professional contingent's installation of setting up.

The technological scheme of the utility model pressure tube is: make impervious barrier with glass fibre reinforced plastics or with sheet metal; twine high-strength carbon steel wire with special machinery and make the wrapping wire layer with anti-hoop tensile stress, structural pipe wall from inside outwards is followed successively by: cement sand bed, frp layer or sheet metal layer, middle cement sand bed, hoop wrapping wire layer, outer cement mortar protective course constitute in the high grade.The short silk of a certain amount of glass fibre can be admixed in each layer mortar,, when making impervious barrier, 2% natrium nitrosum can be added in the wherein interior screed as the employing sheet metal to improve intensity and cracking resistance, antirust with the protection steel plate.

Sealing facility between pressure tube coupling joint seam: main is the Rubber water stop of a border rubber hollow tubular and sheet rubber global formation, its hollow core rubber tube is to be crimped between two pressure tube coupling walls, sheet rubber is to be placed on the outer wall at two pressure tube coupling joint seam places, sheet rubber is fixed with the steel plate circle outward again, and side seams mouth place is stifled firm with the epoxy resin slush in the pressure tube.And the tube coupling joint sealing in anchor block or buttress is to add a sheet rubber circle between anchor block or buttress concrete and the tube wall.

The utility model will be further described below in conjunction with embodiment that accompanying drawing is given.

Fig. 1 is the utility model structural pipe wall sectional arrangement drawing; Fig. 2 is tube coupling joint seam water sealing structure figure; Fig. 3 is rubber hollow tubular and the cross-section profile of sheet rubber before being squeezed.

Referring to Fig. 1, pressure tube is if make impervious barrier (2) with glass fibre reinforced plastics, can be earlier makes in the skeleton of required diameter with the alkyd resin layering bonding of about 4 layers glass fibre coarse cloth and modification and manages; If make impervious barrier (2), then can be welded into the interior pipe of skeleton of required diameter earlier with sheet metal (for example 2 millimeter) volume with sheet metal.Then water 1.2 centimetres of interior screeds (1) that the left and right sides is thick with centrifuge method, at 2 centimetres of middle screeds (3) that the left and right sides is thick of outer surface spray at the skeleton pipe internal surface.After maintenance is good, twine high-strength carbon steel wire, to form hoop steel wire floor (4) with special machinery.The steel wire size and the number of turns can be according to the pressure pipe ring tensile stress size decisions that calculates.The longitudinal steel bar of colligation φ 4 or φ 6 on the hoop steel wire floor is at last from middle screed parcel hoop steel wire and 2 centimetres of outer mortar covers (5) that the left and right sides is thick of longitudinal steel bar spray.

The utility model pressure tube for example be prefabricated into like this 5～10 meters as at the scene prefabricated prefabricated tube coupling that can be longer so that transporting and hoisting.During installation, elder generation lays continuous concrete saddle type basis and leaves the groove of sufficient size in the joint, so that setting pressure pipe joint sealing facility.Also to establish the gravity anchor block in the place that pressure tube is turned.

The utility model pressure connection sealing linkage structure as shown in Figure 2.The hollow pipeloop of rubber (6) is to be squeezed between two tube coupling joint walls, sheet rubber circle (7) is tightly to be enclosed within on the two tube coupling joint tube walls, with steel plate trim ring (8) the sheet rubber circle is fixed rate again, the side seams mouth is with the stifled jail of hoop resin mortar (9) in two tube couplings, but will separate with plastic sheet between itself and rubber hollow tubular.

When the required pressure tube diameter in water power plant is little, the utility model pressure tube can design and produce a kind of simple type, still with glass fibre reinforced plastics or sheet metal as the impervious barrier stress layer of holding concurrently, directly respectively spraying the certain thickness high-strength cement mortar layer of one deck then and get final product inside and outside impervious barrier, is thin cement steel pipe pressure tube.

The advantage that the utility model and existing reinforced concrete pressure pipe relatively have: in light weight, intensity is high, do not seep water in the crack, but millwork production is prefabricated in the making, does not need with expensive template, and quality is guaranteed; With existing clean steel force pipe ratio, it is firm to have enough bending resistance resisting to lose stability under external pressures Degree does not need stiffening ring, support ring, telescopic joint, support rolling structure etc., also has corrosion resistant, does not need periodic maintenance paint in service, and production process technology is simple. The tube coupling joint is sewed with reliably special Rubber water stop measure, can adapt to local changing of the relative positions depression, makes the joint seam water-tight.

Claims

1. wrapping wire cement pressure tube that impervious barrier is arranged.It is characterized in that making impervious barrier, make hoop wrapping wire layer, with the fixed formation of high-strength cement mortar layering with high-strength carbon steel wire with glass fibre reinforced plastics.Structural pipe wall outwards is followed successively by from the lining: interior cement sand bed (1), frp layer (2), middle cement sand bed (3), hoop wrapping wire layer (4) and outside cement mortar protective course (5).

2. according to the described pressure tube of claim 1, it is characterized in that the glass fibre reinforced plastics of making impervious barrier can replace with sheet metal.

3. according to claim 1,2 described pressure tubes, the main sealing facility that it is characterized in that tube coupling joint seam is the Rubber water stop of a border rubber hollow tubular (6) and sheet rubber circle (7) global formation, by steel plate circle (8) the sheet rubber circle is compressed, the inboard seam mouth of pressure tube coupling is stifled firm with epoxy resin slush (9) again.