CN215635482U

CN215635482U - Optimization device for improving stability of PCCP (prestressed concrete cylinder pipe) pipe foundation

Info

Publication number: CN215635482U
Application number: CN202121786453.3U
Authority: CN
Inventors: 詹新民; 林松青; 张增辉; 刘鹏峰; 詹芷叶; 张智远; 黄志涛; 林兴铭
Original assignee: Huaneng Luoyuan Power Generation Co Ltd
Current assignee: Huaneng Luoyuan Power Generation Co Ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-01-25
Anticipated expiration: 2031-08-02

Abstract

The utility model relates to an optimization device for improving the stability of a PCCP (prestressed concrete cylinder pipe) pipe foundation, which comprises a pipe groove, a PCCP pipe and an anti-scouring layer arranged in the pipe groove, wherein the anti-scouring layer is composed of a plurality of laying blocks, the laying blocks are three layers in total, the top layer and the bottom layer of each laying block are geotextiles, and a geogrid is clamped between the two layers of geotextiles; the utility model has strong practicability and very simple operation, can not only enable rainwater on the ground to permeate, but also prevent the underground seawater from scouring the PCCP pipe foundation, ensures that the foundation layer is not damaged, and provides a good cushion layer foundation for the PCCP pipe, thereby ensuring the safe operation of the PCCP pipe equipment, improving the equipment reliability, having low cost and not influencing the performance of the original PCCP pipe.

Description

Optimization device for improving stability of PCCP (prestressed concrete cylinder pipe) pipe foundation

Technical Field

The utility model relates to an optimization device for improving the stability of a PCCP (prestressed concrete cylinder pipe) pipe foundation, which is applied to the field of circulating water PCCP pipe foundations.

Background

The supercritical unit engineering circulating water pipeline adopts a prestressed steel cylinder concrete pipeline (PCCP pipeline), and the joint is usually installed by adopting a double-rubber-ring socket joint type joint so as to ensure the tightness of the pipeline joint; however, the distance between the PCCP pipe foundation and the sea is only about 20 meters, the ground elevation is 5.0 meters, the PCCP pipe foundation elevation is 0.0 meter, when the sea water is at a high tide level (first or fifteen days in lunar calendar every month), one meter of deep sea water exists in the foundation pit, and mainly water seepage exists in rock cracks; once the tide level is high, the foundation ditch water level rises, the tide level is low, the water level whereabouts, the time has been of a specified duration, PCCP pipe foundation's the type of moulding is washed by the sea water and will be destroyed, long-term pipeline foundation will be the height uneven, bell and spigot department will have stress so that the crack appears, and last bell and spigot appears leaking, and then leads to circulating water system, unit to be forced to shut down, consequently has very big hidden danger.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides an optimization device for improving the stability of a PCCP pipe foundation, which can not only enable ground rainwater to permeate, but also prevent underground seawater from scouring the PCCP pipe foundation, ensure that a foundation layer is not damaged, and provide a good cushion layer foundation for the PCCP pipe, thereby ensuring the safe operation of PCCP pipe equipment and improving the reliability of the equipment.

The technical scheme of the utility model is as follows:

the utility model provides an improve stable optimizing apparatus in PCCP pipe foundation, includes pipe slot, PCCP pipe and sets up the scour prevention layer in the inside pipe slot, the scour prevention layer is laid the piece by a plurality of and is constituted, lay the total three-layer of piece, the top layer and the bottom of every piece of laying are geotechnological cloth, it is equipped with one deck geogrid to press from both sides between the two-layer geotechnological cloth.

The specification of the paving blocks is preferably 20m by 20m, and the overlapping length between two adjacent paving blocks is not less than 1000 mm.

The geotextile is a strong filament woven geotextile, the mass per unit area of the geotextile is not less than 400g/m, the weft-wise and warp-wise breaking strength of the geotextile is not less than 100KN/m, and the bursting strength of the geotextile is not less than 10 KN.

The geogrid is a bidirectional warp knitting geogrid, the longitudinal tensile strength of the geogrid is 120KN/m, and the transverse tensile strength of the geogrid is 120 KN/m.

The elongation of the geogrid is not more than 10%, the mesh size is 25X25mm, and the width of the geogrid is more than or equal to 5 m.

The utility model has the following beneficial effects:

by the improved optimization device for improving the stability of the PCCP pipe foundation, the stability of the circulating water PCCP pipe foundation can be improved, the PCCP pipe foundation layer is prevented from being washed by seawater, and a good foundation layer is provided, so that the safe operation of the PCCP pipe equipment is ensured, the reliability of the equipment is improved, the cost is low, and the performance of the original PCCP pipe is not influenced; the device is convenient to construct, low in cost and cost, high in safety and stability, capable of avoiding equipment abnormity, reducing maintenance cost and improving equipment reliability.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of a paving block of the present invention;

the reference numbers in the figures denote:

1. a tube groove; 2. an anti-scouring layer; 3. a PCCP pipe; 4. paving blocks; 41. geotextile; 42. geogrid.

Detailed Description

The utility model is described in detail below with reference to the figures and the specific embodiments.

Referring to fig. 1 to 2, the optimization device for improving the PCCP pipe foundation stability includes a pipe groove 1, a PCCP pipe 3 and an anti-scouring layer 2 arranged inside the pipe groove 1, wherein the anti-scouring layer 2 is composed of a plurality of laying blocks 4, the laying blocks 4 have three layers, the top layer and the bottom layer of each laying block 4 are geotextiles 41, and a geogrid 42 is sandwiched between the two layers of geotextiles 41.

The size of the paving blocks 4 is preferably 20m by 20m, and the overlapping length between two adjacent paving blocks 4 is not less than 1000 mm.

The geotextile 41 is a strong filament woven geotextile, the mass per unit area of the geotextile 41 is not less than 400g/m, the weft-wise warp breaking strength of the geotextile 41 is not less than 100KN/m, and the bursting strength of the geotextile 41 is not less than 10 KN.

The geogrid 42 is a bidirectional warp knitting geogrid, the longitudinal tensile strength of the geogrid is 120KN/m, and the transverse tensile strength of the geogrid is 120 KN/m.

The elongation of the geogrid 42 is not more than 10%, the mesh size is 25X25mm, and the width of the geogrid is more than or equal to 5 m.

The working principle of the utility model is as follows:

when the utility model is used, firstly, M20 cement mortar with the thickness of 100mm is adopted to level the bottom surface of the pipe groove 1, then each layer of the laying blocks 4 of the scour prevention layer 2 is processed into the specification of 20mX20M, the laying blocks 4 are further lapped, the lapping length between two adjacent laying blocks 4 is not less than 1000mm, firstly, a layer of strong filament woven geotextile 41 is laid, then a bidirectional warp-knitted geotextile geogrid 42 is laid above the strong filament woven geotextile 41, finally, a layer of strong filament woven geotextile 41 is laid above the geogrid 42, and then PCCP pipeline 3 installation, interface hydraulic pressure test, interface grouting and earthwork backfilling are carried out; the device after the improvement is at the in-process that sea water tide level rises or descends, provides a good bed course basis for PCCP pipe 3, avoids long-term use in-process PCCP pipe 3 basal layer to be washed away by the sea water, and then has improved the stability of circulating water PCCP pipe 3 basis, avoids socket department because of the crack that the stress so that appears, has avoided simultaneously that the bell and spigot appears leaking, circulating water system, unit to be forced the circumstances of shutting down and has taken place, has stopped the potential safety hazard.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides an improve stable optimizing apparatus in PCCP pipe basis which characterized in that: including pipe slot (1), PCCP pipe (3) and setting in inside scour prevention layer (2) of pipe slot (1), scour prevention layer (2) are laid piece (4) by a plurality of and are constituted, lay the total three-layer of piece (4), the top layer and the bottom layer of every laying piece (4) are geotechnological cloth (41), press from both sides between two-layer geotechnological cloth (41) and be equipped with one deck geogrid (42).

2. The optimized apparatus for improving the stability of a PCCP pipe foundation of claim 1, wherein: the specification of the laying blocks (4) is 20m by 20m, and the overlapping length between two adjacent laying blocks (4) is not less than 1000 mm.

3. The optimized apparatus for improving the stability of a PCCP pipe foundation of claim 1, wherein: the geotextile (41) is a strong filament woven geotextile, the mass per unit area of the geotextile (41) is not less than 400g/m, the weft-wise and warp-wise breaking strength of the geotextile (41) is not less than 100KN/m, and the bursting strength of the geotextile (41) is not less than 10 KN.

4. The optimized apparatus for improving the stability of a PCCP pipe foundation of claim 1, wherein: the geogrid (42) is a bidirectional warp knitting geogrid, the longitudinal tensile strength of the geogrid is 120KN/m, and the transverse tensile strength of the geogrid is 120 KN/m.

5. The optimized apparatus for improving the stability of a PCCP pipe foundation of claim 4, wherein: the elongation of the geogrid (42) is not more than 10%, the mesh size is 25X25mm, and the width of the geogrid is more than or equal to 5 m.