JP3761002B2 - On-site assembly installation method for valve turbines - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an on-site assembly and installation method for a valve turbine.
[0002]
[Prior art]
Conventionally, when assembling the inner casing, outer casing, inner guide vane ring, outer guide vane ring and guide vane horizontally divided into two in large valve water turbines, the inner casing and outer casing are first assembled, welded and installed. Fix in place and place concrete around the outer casing. After the concrete has hardened, the inner guide vane ring, the guide vane and the outer guide vane ring are assembled, and the downstream flange of the fixed inner casing and the upstream flange of the inner guide vane ring are coupled with bolts and the outer casing. The downstream flange and the upstream flange of the outer guide vane ring are connected by bolts.
[0003]
[Problems to be solved by the invention]
However, in the conventional assembly and installation method, when casting concrete, the inner casing and outer casing are deformed into an elliptical shape due to the casing's own weight + concrete load + heat generated when the concrete is hardened. Since it spreads in the lateral direction and distortion occurs in the flange surfaces of the inner casing and the outer casing on the downstream side, it is necessary to correct the distortion after the concrete is hardened, and a great deal of time is spent on the work.
[0004]
It is an object of the present invention to provide an on-site assembly and installation method for a valve turbine in which the rigidity of the inner casing and the outer casing on the downstream side is increased, and distortion is not generated in the inner casing and the outer casing when placing concrete. .
[0005]
[Means for Solving the Problems]
This invention provides a field assembly installation method of the valve water wheel, first after the horizontal two divided inner casing and out installation wick in place, and installed horizontally bisected outer casing around the inner casing, wherein The inner casing and the outer casing are joined together by welding , and then the preassembled inner guide vane ring, the guide vane and the outer guide vane ring are integrally suspended by a lifting jig, and the downstream side of the inner casing The flange and the upstream flange of the inner guide vane ring are connected by bolts, the downstream flange of the outer casing and the upstream flange of the outer guide vane ring are connected by bolts, and one end is fixed to the concrete building. The other end is downstream of the outer guide vane ring Attaching a plurality of pipes jacks devoted on the flange surface horizontally, then a shall cured by Da設concrete a plurality of times on the outer circumference of the outer casing. According to the present invention, the relatively strong inner guide vane ring and outer guide vane ring are joined to the inner casing and the outer casing , which are less rigid, by the flange before placing the concrete , respectively, thereby increasing the rigidity of the inner casing and the outer casing. Since the concrete is cast after being made, the occurrence of distortion of the inner casing and the outer casing due to the concrete casting can be prevented. However, in this method, the inner casing and the outer casing on which concrete is not placed as in the prior art are not coupled to the inner guide vane ring and the outer guide vane ring, so that the weight of each casing is supported and the casing is troublesome. In order to prevent this, a horizontal pipe jack that supports the flange of the outer casing is required. In addition, during concrete placement, the strain can be checked by measuring the temperature and strain of the inner casing, outer casing and concrete by means of sensors installed in the inner casing, outer casing and concrete.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal sectional view of a valve turbine showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. In FIG. 1, an outer casing 2 is positioned outside the inner casing 1, a guide vane 5 is positioned between the inner guide vane ring 3 and the outer guide vane ring 4, and concrete 8 is placed outside the outer casing 2. Is done. In FIG. 2, the inner casing 1 is indicated by a double line because the diameter is reduced in the flow direction, and the inside of the concrete 8 coincides with the outer surface of the outer casing 2. Water flows in a water channel between the inner casing 1 and the outer casing 2. An embodiment of on-site assembly installation of a valve turbine will be described below. First, the inner casing 1 divided into two horizontally is centered at a predetermined position, and then the outer casing 2 divided into two horizontally is installed around the inner casing 1 and the inner casing 1 and the outer casing 2 are welded to be joined together. Next, the previously assembled inner guide vane ring 3, outer guide vane ring 4 and guide vane 5 are united and suspended by a crane, and the downstream flange 1a of the inner casing and the upstream flange 3a of the inner guide vane ring are connected. While connecting with a volt | bolt, the downstream flange 2a of an outer casing and the upstream flange 4a of an outer guide vane ring are couple | bonded with a volt | bolt. Further, a plurality of pipe jacks 7 having one end fixed to the concrete building and the other end equally spaced on the surface of the downstream flange 4b of the outer guide vane ring are horizontally attached.
Thereafter, the concrete 8 is placed on the outer periphery of the outer casing 2 a plurality of times, in FIG. The stay vane 9 is coupled to the outer casing 2. 10 is a reinforced concrete beam and 11 is a hatch cover.
The reason for placing concrete in multiple times is as follows. That is, if concrete is placed at once, the formwork may be broken due to the weight of the concrete itself, the concrete is easily solidified, and the structure inside the concrete is deformed by the heat generated when the concrete solidifies. In addition to the possibility, in the case of a valve turbine, if the entire valve is buried in concrete at once, buoyancy may occur in the valve, which may cause the valve core to go wrong. The purpose is to prevent the accumulation of air between the bottom and the distortion of the valve due to the heat of the concrete. In the case of FIG. 1, the concrete is placed in 8 steps, but if the valve is small, it may be placed in about 5 times. During the concrete placement, the temperature and strain of each of the inner casing 1, the outer casing 2 and the concrete 8 are measured by sensors.
According to this assembly and installation method, the inner casing 1 and the inner guide vane ring 3 are coupled to each other by the bolts 1a and 3a , and the outer casing 2 and the outer guide vane ring 4 are coupled to each other by the bolts 2a and 4a . Since the concrete 8 is casted by being bonded to each other, the inner casing 1 and the outer casing 2 are not crushed by their own weight + concrete load + heat generated at the time of hardening of the concrete and are not deformed into an oval shape.
[0007]
【The invention's effect】
In the present invention, first, the horizontally divided inner casing is installed and centered at a predetermined position, then the horizontally divided outer casing is installed around the inner casing, and the inner casing and the outer casing are welded. Then, the inner guide vane ring, the guide vane and the outer guide vane ring, which are assembled in advance, are suspended together by a lifting jig, and the downstream flange of the inner casing and the inner guide vane ring are The upstream flange is coupled with a bolt, the downstream flange of the outer casing and the upstream flange of the outer guide vane ring are coupled with a bolt, and one end is fixed to the concrete building and the other end is an outer guide vane. Level on the downstream flange face of the ring A plurality of pipe jacks applied at intervals are horizontally mounted, and then concrete is placed and cured on the outer periphery of the outer casing in multiple times, so that the inner casing and the outer casing on the downstream side are hardened. Since the concrete is cast after the rigidity is increased, the inner casing and the outer casing are not distorted even if their own weight, concrete load, and heat generated during concrete hardening are applied. As a result, the downstream casing flange surface distortion correction work performed in the conventional installation method can be omitted, and the on-site assembly installation work time of the valve turbine can be greatly shortened.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a valve turbine showing an embodiment of a method for on-site assembly and installation of the valve turbine according to the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner casing 1a Outer casing downstream flange 2 Outer casing 2a Outer casing downstream flange 3 Inner guide vane ring 3a Inner guide vane ring upstream flange 4 Outer guide vane ring 4a Outer guide vane ring upstream flange 4b Outside Guide vane ring downstream flange 5 Guide vane 6 Outer guide vane ring downstream flange vicinity conical circumferential weld 7 Pipe jack 8 Concrete 9 Stay vane

Claims (2)

First after the horizontal two divided inner casing and out installation wick in place, and it installed horizontally bisected outer casing around the inner casing, bound together by welding and the inner casing and the outer casing Then, the preassembled inner guide vane ring, the guide vane and the outer guide vane ring are suspended together by a lifting jig, and the downstream flange of the inner casing and the upstream flange of the inner guide vane ring are The bolts are coupled by a bolt, and the downstream flange of the outer casing and the upstream flange of the outer guide vane ring are coupled by a bolt, and one end is fixed to the concrete building and the other end is a downstream flange of the outer guide vane ring. a plurality of pipes jack that has been applied to on the surface Earnestly attachment, then local assembly installation method of the valve water wheel, wherein the curing by Da設concrete a plurality of times on the outer circumference of the outer casing. 2. The method of on-site assembly installation of a valve turbine according to claim 1, wherein during concrete placement, the temperature and strain of the inner casing, the outer casing and the concrete are measured by a sensor mounted in the inner casing, the outer casing and the concrete. A local assembly and installation method for valve turbines.

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