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

A pressure steel pipe and channel structure technology, applied in hydropower stations, water conservancy projects, hydroelectric power generation, etc., can solve the problems of delaying the construction period, single function of the manhole for inspection and maintenance, and long tunnel lines, etc., so as to reduce the amount of excavation work, Ease of daily management and maintenance, and shorten the construction period

Active Publication Date: 2011-11-23
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

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Embodiment 1

[0027] Such as Figure 4-6 As shown, in this embodiment, there is only one construction support tunnel 1 used to excavate a long tunnel to increase the construction working surface during the construction period. One end of the construction support tunnel is with two parallel penstocks (penstock I 7 and penstocks) as the main tunnel of the tunnel. II 8) Vertically intersecting arrangement, each penstock is connected with inclined shaft 6 (one upward, the other downward). The construction support tunnel 1 and the end penstock (penstock I 7) are arranged in a T shape, and the construction support tunnel 1 and the other penstock (penstock II 8) are arranged in a cross shape. In this example, the penstock I 7 is an embedded pipe. The plugging body 3 is poured at the end of the construction branch tunnel 1 at the junction with the penstock I. The maintenance access passage 4 is pre-embedded in the plugging body and in the channel Access door 5 is set on the outside. The penstock II...

Embodiment 2

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

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

[0035] 1. The construction support tunnel 1 passes through two penstocks vertically, namely the penstock I 7 at the end of the construction tunnel and the penstock II 8 at the middle of the construction tunnel. Both penstocks are designed as exposed pipes. After the installation of I is completed (the section at the junction with the construction branch tunnel), directly set up an access passage 4 for the penstock I 7 and an access door 5 on the outside of the passage;

[0036] 2. After the installation of the penstock II 8 is co...

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

Claims

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Application Information

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IPC IPC(8): E02B9/06
CPCY02E10/22Y02E10/20
Inventor 姚敏杰冯仕能袁翔
Owner POWERCHINA HUADONG ENG COPORATION LTD
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