Pressure steel pipe overhaul access passage structure of high-water head hydropower station and construction method thereof

A technology of penstock and construction method, applied in the direction of hydropower station, water conservancy project, hydropower generation, etc., can solve the problems of delayed construction period, long hole line, single function of maintenance and entry hole, etc., so as to facilitate daily management and maintenance, shorten the The effect of reducing the construction period and reducing the amount of excavation works

Active Publication Date: 2013-03-20
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The construction branch tunnel 1 is used as an auxiliary cavern for excavating a long tunnel to increase the construction face during the construction period, and it is necessary to arrange it; while the maintenance access tunnel has a single function, and it is only excavated for the later arrangement of the maintenance access passage, and the maintenance progress Manhole 2 needs to be arranged around two penstocks (pipeline I 7, penstock II 8) on the plane, so that the tunnel line is often longer, resulting in a certain delay in the construction period
After the construction of the two access passages 4 for maintenance is completed, if access is required for maintenance, they need to arrive from the tunnels on both sides separately, and they need to be operated and managed separately, causing some inconvenience

Method used

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  • Pressure steel pipe overhaul access passage structure of high-water head hydropower station and construction method thereof
  • Pressure steel pipe overhaul access passage structure of high-water head hydropower station and construction method thereof
  • Pressure steel pipe overhaul access passage structure of high-water head hydropower station and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as Figure 4-6 As shown, the present embodiment has only one construction branch tunnel 1 that increases the construction face as the excavated long tunnel during the construction period, and one end of the construction branch tunnel is connected with two parallel pressure steel pipes (pressure steel pipes 1, 7 and pressure steel pipes) as the tunnel main tunnel. II 8) Arranged vertically and intersecting, each penstock is connected with an inclined well 6 (one upward, the other downward). The construction branch hole 1 is arranged in a T-shape with the end pressure steel pipe (the pressure steel pipe I 7), and the construction branch hole 1 is arranged in a cross shape with another pressure steel pipe (the pressure pipe II 8). In this example, the penstock 17 is a buried pipe, and the plugging body 3 is poured at the end of the construction branch hole 1 at the junction of the penstock 1, and the maintenance access channel 4 is pre-buried in the plugging body, and...

Embodiment 2

[0033] Such as Figure 7-9 As shown, the basic structure of this example is the same as Example 1, the difference is that the two penstocks are open pipes, the steel is 600MPa or 800MPa grade steel, and the thickness of the pipe wall is 30-50mm. (Under high internal water pressure, it is necessary to increase the thickness of the pipe wall, and it can also be upgraded to a steel plate with higher strength).

[0034] The construction method in this example includes steps:

[0035] 1. The construction branch tunnel 1 passes through two penstocks vertically, which are the penstock I 7 at the end of the construction branch tunnel and the penstock II 8 in the middle of the construction branch tunnel. Both penstocks are designed as open pipes. When the penstock After the I installation is completed (junction tunnel section with the construction branch tunnel), the maintenance access passage 4 is directly established on the penstock I 7, and the access door 5 is established on the o...

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Abstract

The invention relates to a pressure steel pipe overhaul access passage structure of a high-water head hydropower station and a construction method thereof. The invention aims at realizing the purposes of being capable of arranging overhaul access passages on two or more parallel pressure steel pipes and simultaneously reducing the excavation of an overhaul access hole with single function, further facilitating the reduction of the hole chamber excavation engineering quantity and the shortening of the construction period and simultaneously creating convenience for daily management and maintenance. In the technical scheme of the invention, a construction adit and a pressure steel pipe at the tail end are in T-shaped arrangement, the construction adit and other pressure steel pipes are in cross arrangement and a steel climbing ladder is erected at the upper parts of the other pressure steel pipes; and the overhaul access passage is arranged on the boundary of each pressure steel pipe andthe construction adit and at the inlet end, and an access door is arranged on the outer side of the passage.The invention is applicable to water diversion buildings of the hydropower stations.

Description

technical field [0001] The invention relates to a passageway structure and a construction method for the inspection and maintenance of penstocks in high-water-head hydropower stations. It is suitable for water diversion structures of hydropower stations. Background technique [0002] According to the "Code for Design of Penstocks in Hydropower Stations" (DL / T 5141-2001), all steel pipes that can enter people should be provided with manholes. In order to meet the requirements of venting and entering the penstock of high water head hydropower station for inspection and maintenance, it is necessary to arrange inspection and maintenance access passages in the flat tunnel section. In the prior art, the maintenance access of the upper flat hole can be through the vent hole behind the water inlet gate or the diversion surge well, and the maintenance access of the lower flat hole can be through the inlet hole of the ball valve or butterfly valve on the upstream side of the unit. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B9/06
CPCY02E10/20
Inventor 姚敏杰冯仕能袁翔
Owner POWERCHINA HUADONG ENG COPORATION LTD
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