CN216692703U

CN216692703U - Pipeline protection structure

Info

Publication number: CN216692703U
Application number: CN202123197624.1U
Authority: CN
Inventors: 张峻伟; 赵钪; 严浩
Original assignee: CISDI Engineering Co Ltd
Current assignee: CISDI Engineering Co Ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-06-07
Anticipated expiration: 2031-12-17

Abstract

The utility model discloses a pipeline protection structure, which comprises a foundation, a pipeline, a protection layer and a support layer, wherein the protection layer at least comprises a geotechnical cloth layer covering the pipeline and a sand retention layer covering the geotechnical cloth layer; the supporting layer is arranged between the pipeline and the geotechnical cloth layer, two ends of the supporting layer in the radial direction respectively continue to extend towards the foundation to form a coating for the pipeline, and the part of the protective layer exposed out of the foundation is trapezoidal; the device can resist the erosion of sea waves, prevent the pipeline from being damaged and play a role in effectively protecting the pipeline.

Description

Pipeline protection structure

Technical Field

The utility model relates to the field of sea area pipeline protection, in particular to a pipeline protection structure.

Background

At present, in order to facilitate logistics and marine transportation, a plurality of large-scale industrial enterprises (such as steel enterprises) are built in coastal areas; industrial enterprises need to use water, and a water source diversion pipeline and a wastewater final discharge pipeline of a plant area can have a section which needs to cross over a beach section outside the plant and is laid along the coast; if the sand beach floor is on an erosion coast, the absolute elevation of the terrace at the sand beach can be lowered after a period of time due to serious erosion of seawater and sea waves, so that the pipeline is exposed, abraded and damaged; for the protection of the pipeline, a coating structure is generally arranged according to the national standard of water supply and drainage in design, and then a balancing weight is coated or a twisted king block is compacted; in combination with the examination of the implemented project, the conventional method cannot effectively protect the pipeline; the erosion action of sea waves during the ebb tide can empty the sandstone at the lower part, and then the balancing weight or the twisted king block abrades the pipeline under the washing of the sea waves, so that the pipeline water leakage is caused.

Therefore, in order to solve the above problems, a pipeline protection structure is needed, which can resist against the erosion of sea waves, prevent the pipeline from being damaged, and effectively protect the pipeline.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to overcome the drawbacks of the prior art, and to provide a protection structure for a pipeline, which can resist against the erosion of sea waves, prevent the pipeline from being damaged, and effectively protect the pipeline.

The pipeline protection structure comprises a foundation, a pipeline, a protection layer and a supporting layer, wherein the protection layer at least comprises a geotechnical cloth layer covering the pipeline and a sand retention layer covering the geotechnical cloth layer; the supporting layer is arranged between the pipeline and the geotextile layer, the supporting layer respectively continues to extend towards the foundation along the radial two ends to form a coating for the pipeline, the part of the protective layer exposed out of the foundation is trapezoidal, the pipeline is laid on the foundation, the pipeline at least comprises an exposed section exposed out of the foundation, the protective layer forms a coating for the exposed section, the supporting layer covers the exposed section, the supporting layer respectively continues to extend towards the foundation along the radial two ends to form a coating for the exposed section, and the geotextile layer covers the supporting layer. The protective layer which is in a trapezoidal structure and is exposed out of the foundation can resist the impact of sea waves and improve the interception effect on sand and stones.

Furthermore, the sand-retaining layer at least comprises a gravel layer, a block stone layer and a twisted king character block layer, wherein the particle size of the gravel layer is gradually increased, and the gravel layer, the block stone layer and the twisted king character block layer are covered on the geotechnical cloth layer by layer from bottom to top.

Furthermore, a compaction pit is dug at the offshore side of the foundation, and the pipeline is pre-buried at the rear side of the compaction pit along the sea wave erosion direction; the protective layer comprises an embedded section and a covering section, the covering section comprises a protective slope for resisting sea wave impact and an interception slope for preventing sand and stone loss, the protective slope is positioned on the front side of the covering section along the sea wave erosion direction, and the interception slope is positioned on the rear side of the covering section along the sea wave erosion direction; the protection slope extends towards the compaction pit to form an embedding section, and the embedding section is embedded into the compaction pit.

Furthermore, the cross section of the compaction pit in the direction of erosion by sea waves is in an inverted trapezoid shape, two trapezoid waists respectively form an offshore slope and a far-sea slope, and the embedding section covers the far-sea slope and extends along the upper bottom of the trapezoid to cover the upper bottom of the trapezoid.

Further, the embedded section is backfilled into a compaction pit through natural sandy soil, and the depth H of the compaction pit is not less than 1.5 times of the sea wave erosion depth of the design year; the slope ratio of the offshore slope is not more than 1/3, and the slope ratio of the offshore slope is not more than 1/3.

Further, the slope ratio of the protection slope is the same as that of a far sea slope, and the slope ratio of the interception slope is not more than 1/2.

Furthermore, a floating pressure section covered on the pipeline is arranged between the protective slope and the interception slope, and the covering section is formed by respectively connecting two ends of the floating pressure section in the direction of the erosion of the sea waves along the floating pressure section with the protective slope and the interception slope; the floating pressure section comprises a middle section covering right above the pipeline, a front section connected to the protective slope by extending forwards from the middle section and a rear section connected to the retaining slope by extending backwards from the middle section.

Furthermore, the middle section is formed by upward protruding of the floating pressure section, so that the top surface of the front section and the top surface of the rear section are not higher than the top surface of the middle section; the middle section is transited to the front section through a front slope, and the slope ratio of the front slope is not more than 1/2; the middle section is transited to the rear section through a rear slope, and the slope ratio of the rear slope is not more than 1/2; the pipeline is located in the middle of the middle section, and the width of the middle section is not less than 3 times of the diameter of the pipeline.

Further, the whole width of inoxidizing coating is not less than 8 pipeline diameters, the back end width is 2 times of anterior segment width at least.

The utility model has the beneficial effects that: the utility model discloses a pipeline protection structure, wherein a pipeline is laid on a foundation and partially exposed out of the foundation to form an exposed section, the pipeline is protected by a geotextile layer covering the exposed section and a sand retaining layer covering the geotextile layer, the geotextile has high water permeability by utilizing the water permeability and sand impermeability of the geotextile, the sand passes through the geotextile, the sand is retained, the upper layer can concentrate stress diffusion, the lower layer sand and the upper layer stone are prevented from being mixed, the sand is retained by combining the sand retaining layer, and the sand is not lost or is rarely lost during sea wave erosion, so that the pipeline is effectively protected, the erosion degree of the pipeline caused by sea wave impact and ebb can be reduced, and the pipeline protection erosion effect is achieved.

Drawings

The utility model is further described below with reference to the following figures and examples:

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

Fig. 1 is a schematic structural diagram of the present invention, as shown in the drawing, the direction indicated by the arrow is the sea wave erosion direction, the front in the scheme is that the position close to the sandy soil backfilling area along the sea wave erosion direction is the front, the position far away from the sandy soil backfilling area is the back, the upper and lower parts are the upper and lower parts in the high direction in the drawing, the width is the distance in the front-back direction, the thickness is the distance in the up-down direction, because of the structural characteristics of irregular shapes such as gravel and the like and the influence of the conditions such as construction, corrosion, loss and the like, the related data are divisors, i.e. not exact numerical values in strict sense, and the description is omitted herein; the pipeline 02 protection structure for resisting sea wave erosion in the embodiment comprises a foundation 01, a pipeline 02 and a protection layer, wherein the pipeline 02 is laid on the foundation 01, the pipeline 02 at least comprises an exposed section exposed out of the foundation 01, the protection layer forms a covering for the exposed section, and the protection layer at least comprises a geotextile layer 03 covering the exposed section and a sand retention layer covering the geotextile layer 03. As shown in the figure, the pipeline 02 is laid on the foundation 01 and partially exposed out of the foundation 01 to form an exposed section, the pipeline 02 is protected by the geotextile layer 03 covering the exposed section and the sand-retaining layer covering the geotextile layer 03, and the sand-retaining layer can be the one in the prior artThe sandstone mixed coating or the coating of the twisted Chinese character 'wang' block can also be formed by covering the sandstone mixed coating or the twisted Chinese character 'wang' block layer by layer, and the construction for retaining the sandstone is achieved, which is not described again; utilize the ability that geotechnological cloth permeates water and does not pass through the sand, and geotechnological cloth possesses high water permeability, and rivers pass through, and the sand is held back, can concentrate stress diffusion with the upper strata, prevents mixing of lower floor's sand and upper strata lamella stone simultaneously, combines to stay the sand and holds the sand, and the sand does not take place to run off or the loss of taking place for a short time when the wave corrodes for pipeline 02 obtains effective protection, can reduce and lead to the fact the degree of erosion to pipeline 02 by wave impact and ebb tide, plays the effect of protecting pipeline 02 protection erosion, geotechnological cloth density is not less than 350g/m²The density of the geotextile is 350g/m²～500g/m²The density of the geotextile in the scheme is 350g/m²。

In this embodiment, the geotextile layer 03 covers the supporting layer 04, and the supporting layer 04 extends to the foundation 01 along the radial direction to form a covering for the exposed section. In order to enhance the compressive strength of the pipeline 02, a supporting layer 04 is arranged on the pipeline 02, the supporting layer 04 covers the exposed section and extends downwards along the radial outer wall of the pipeline 02 to form a coating for the pipeline 02, the coating is in a semi-surrounding structure and covers the top of the pipeline 02, the supporting layer 04 is embedded in the foundation 01 to form a stable supporting effect for the coating of the pipeline 02 with the foundation 01, a stable supporting and protecting structure is formed, the supporting strength and the compressive strength are improved, the supporting layer 04 is a concrete layer, the thickness of the concrete layer is not less than 20cm, the thickness of the further concrete is 20 cm-50 cm, the thickness of the concrete layer in the scheme is 20cm, the supporting layer 04 can also adopt a combined supporting structure of reinforced concrete or the substitution of other supporting materials for the concrete, and the description is omitted.

In this embodiment, the sand retention layer at least includes a gravel layer 05, a block stone layer 06 and a twisty king character block layer 07, the particle size of which gradually increases and which are covered on the geotextile layer 03 layer by layer from bottom to top.

The thickness of the crushed stone layer 05 is not less than 20cm, and the thickness of the further crushed stone layer 05 is between 20cm and 50 cm; the particle size of the crushed stone layer 05 is less than 20cm, and the particle size of the further crushed stone layer 05 is between 5cm and 20 cm; the relative bulk density Dr of the crushed stone layer 05 is more than or equal to 0.6, and the relative bulk density Dr of the crushed stone layer 05 is further between 0.6 and 0.9; the saturated compressive strength of the crushed stone layer 05 is not less than 30Mpa, and the saturated compressive strength of the crushed stone layer 05 is between 30Mpa and 50 Mpa; the mud content of the rubble layer 05 is less than 10 percent, and the mud content of the rubble layer 05 is 5 to 10 percent; according to the scheme, the thickness of the gravel layer 05 is 20cm, the particle size of the gravel is 5 cm-20 cm, the gravel layer 05 relative compression density, the saturated compressive strength of the gravel layer 05 and the mud content of the gravel layer 05 are adjusted to meet the standards, the particle size of the gravel is determined to be adjusted according to the thickness of the gravel layer 05 during actual construction, if the thickness of the gravel layer 05 is 30cm, the particle size of the gravel which can be adopted is 10 cm-30 cm, the gravel layer 05 relative compression density, the saturated compressive strength of the gravel layer 05 and the mud content of the gravel layer 05 are adjusted according to the erosion degree of the sea waves and construction conditions, and other parameters are adjusted to achieve the effects of resisting the sea waves and intercepting the silt with medium and small particle sizes, and the repeated description is omitted;

the thickness of the block stone layer 06 is not less than 50cm, and the thickness of the further block stone layer 06 is between 50cm and 100 cm; the particle size of the block stone layer 06 is not less than 20cm, and the particle size of the further block stone layer 06 is between 20cm and 50 cm; the porosity of the massive stone layer 06 is not more than 28 percent, and the further porosity of the massive stone layer 06 is between 5 and 28 percent; the saturated compressive strength of the stone layer 06 is not less than 30Mpa, and the further saturated compressive strength of the stone layer 06 is between 30Mpa and 50 Mpa; the mud content of the massive stone layer 06 is less than 10 percent, and the mud content of the further crushed stone layer 05 is between 5 and 10 percent; according to the scheme, the thickness of the stone layer 06 is 50cm, the particle size of broken stones is 20 cm-50 cm, the broken stones are mixed and laid, so that the porosity of the stone layer 06, the saturated compressive strength of the stone layer 06 and the mud content of the stone layer 06 can be adjusted according to the thickness of the stone layer 06, the particle size of the large broken stones can be adjusted according to the actual construction, if the thickness of the stone layer 05 is 100cm, the particle size of the broken stones which can be adopted is 50 cm-100 cm, the mixed laying is carried out, parameters such as the porosity of the stone layer 06, the saturated compressive strength of the stone layer 06 and the mud content of the stone layer 06 can be adjusted according to the erosion degree of sea waves and construction conditions, the expected effect of resisting sea waves and the effect of intercepting the large-particle-size gravel are achieved, and the repeated description is omitted;

the twisting Chinese character 'wang' block is of a B type, the thickness is not less than 100cm, the thickness of the further twisting Chinese character 'wang' block is 100-120 cm, the number of blocks per 100 square meters of the protective area of the twisting Chinese character 'wang' block is not less than 150, the number of blocks per 100 square meters of the protective area of the further twisting Chinese character 'wang' block is 150-250, the thickness of the twisting Chinese character 'wang' block in the scheme is 100cm, the number of blocks per 100 square meters of the protective area of the twisting Chinese character 'wang' block is about 150, the twisting Chinese character 'wang' block is closely arranged, the laying direction of the twisting Chinese character 'wang' block is random, more specifically, two support rods in each twisting Chinese character 'wang' block need to be ensured to land simultaneously, the direction fixed points are randomly laid, the blocks are obliquely laid on a slope, the placing directions of adjacent blocks are different, and manual supporting is assisted in lifting, so that the two support rods land simultaneously in the block, and the function of weakening the impact force of waves and protecting the breakwater is achieved;

as shown in the figure, the sand layer that stays in this scheme includes that the successive layer covers in the metalling 05 of geotechnological cloth layer 03, the cubic stone layer 06 and turns round king's block layer 07, and the particle size successive layer increases, rubble and cubic stone do not take place to mix, the cooperation is turned round king's block, make intensity enough to resist the wave, and turn round the direction that king's block can break the wave, the concentrated impact force of wave dissipates the wave, the wholeness of cooperation metalling 05 and cubic stone layer 06 layering cladding can be maintained, the impact force of wave is consumed layer by layer, when the wave comes back, can effectively prevent the erosion of wave and the grit loss that causes when the wave returns the tide, water sees through the water work cloth, can not ponding pneumatosis, and natural grit, such as sand, mud, sand, soil is held up by the cladding structure of remaining sand layer, the wave erosion can not take away its, sand and soil loss does not take place during the wave erodees, make pipeline 02 effectively protected.

In this embodiment, a compaction pit is dug in the offshore side of the foundation 01, and the pipeline 02 is pre-buried in the rear side of the compaction pit along the erosion direction of the sea waves; the protective layer comprises an embedded section and a covering section, the covering section comprises a protective slope for resisting sea wave impact and an interception slope for preventing sand and stone loss, the protective slope is positioned on the front side of the covering section along the sea wave erosion direction, and the interception slope is positioned on the rear side of the covering section along the sea wave erosion direction; the protection slope extends towards the compaction pit to form an embedding section, and the embedding section is embedded into the compaction pit. As shown in the figure, the structure of the foundation 01 comprises a compaction pit dug deeply at the offshore side, the pipeline 02 is laid at the rear side of the compaction pit and has a protective distance with the compaction pit, the compaction pit is dug in the offshore direction during construction, then the pipeline 02 is laid, finally the cladding is covered on the pipeline 02 layer by layer, the pipeline 02 is provided with a buried section buried in the compaction pit and covered by natural sandy soil backfilling, the covering section covers the pipeline 02, the front end of the covering section close to the offshore position forms a protective slope, the rear end far away from the offshore position forms a retaining slope, so that the part of the protective layer exposed out of the foundation 01 is in a trapezoid shape, the protective layer exposed out of the foundation is in a trapezoid structure, the protective layer can resist the impact of sea waves and improve the retaining effect of sand and stones, the structure for protecting the pipeline 02 during sea wave impact and retaining the sandy soil during ebb is formed, and the whole protective layer forms a downward reverse-wrapping structure in the erosion direction of the sea waves, the protection effect is improved.

In this embodiment, the cross section of the compaction pit in the coastal wave erosion direction is in an inverted trapezoid shape, two trapezoid waists respectively form an offshore slope and a far-sea slope, the embedded section covers the far-sea slope and extends along the upper bottom of the trapezoid to cover the upper bottom of the trapezoid, and the far-sea slope is close to the pipeline 02 in the coastal wave erosion direction. As shown in the figure, the embedding section covers the far-sea slope and continuously extends along the bottom of the compaction pit, and covers the bottom surface of the compaction pit, and further the embedding section extends to the slope surface of the near-sea slope, the compaction pit with the inverted trapezoid structure can further improve the protection effect on sea waves and the resistance and stabilization effect on sand stones and the like, can form the guide on the impact direction of the sea waves, reduce the impact force of erosion, and improve the protection effect.

In the embodiment, the embedded section is embedded into the compaction pit through natural sandy soil backfilling, the depth H of the compaction pit is not less than 1.5 times of the sea wave erosion depth of the design year, the depth of the compaction pit is further 1.5 times to 2 times of the sea wave erosion depth of the design year, and the depth of the compaction pit in the scheme is designed according to 1.5 times of the sea wave erosion depth of the design year; the slope ratio of the offshore slope is not more than 1/3, the slope ratio of the further offshore slope is 1/3-1/4, the slope ratio of the offshore slope in the scheme is 1/3, the slope ratio of the open sea slope is not more than 1/3, the slope ratio of the further open sea slope is 1/3-1/4, and the slope ratio of the open sea slope in the scheme is 1/3. In order to ensure the transverse (impact and moisture regain direction) stability of the protective layer, the slope ratio of two sides (offshore slope and open sea slope) of the compaction pit is not more than 1/3, the upper part of the compaction pit is backfilled by natural sandy soil, and the structure in the compaction pit and the foundation 01 are integrated, so that the protective effect is improved.

In the embodiment, the slope ratio of the protection slope is the same as that of the far sea slope, the slope ratio of the interception slope is larger than that of the protection slope, the protection slope with a smaller slope ratio can reduce wave impact and adjust the impact direction, the interception slope with a larger slope ratio can improve the interception effect on sand and stone, so that the effective protection effect is achieved, the slope ratio of the interception slope is not more than 1/2, the slope ratio of the interception slope is 1/2-1/3, and the slope ratio of the interception slope in the scheme is 1/2.

In this embodiment, a floating pressure section covering the pipeline 02 is further arranged between the protective slope and the interception slope, and the covering section is formed by connecting two ends of the floating pressure section in the sea wave erosion direction with the protective slope and the interception slope respectively; the floating pressure section comprises a middle section covering right above the pipeline 02, a front section connected to the protective slope by extending forwards from the middle section and a rear section connected to the retaining slope by extending backwards from the middle section. As shown in the figure, the middle section is formed by upward protruding of the floating pressing section, so that the top surface of the front section and the top surface of the rear section are not higher than the top surface of the middle section; the front section and the rear section are located on the same plane and are higher than the plane of the foundation 01, the middle section protrudes out of the front section and the rear section to form a structure which is gradually transited from the middle section to the two side steps, and the two sides are the two sides in the width direction, so that the protection effect is further improved.

In the embodiment, the middle section is transited to the front section through the front slope, the slope ratio of the front slope is not more than 1/2, the slope ratio of the front slope is further 1/2-1/3, and the slope ratio of the front slope in the scheme is 1/2; the middle section is transited to the rear section through a rear slope, the slope ratio of the rear slope is not more than 1/2, the slope ratio of the rear slope is further 1/2-1/3, and the slope ratio of the rear slope in the scheme is 1/2; pipeline 02 is located the middle part in middle section, the width in middle section is not less than 3 pipeline 02 diameters, and the width in further middle section is 3 ~ 5 times of pipeline 02 diameters, and the width in middle section is 3 pipeline 02 diameters doubly in this scheme, improves the safeguard effect, prevents that the too short prevention that causes in middle section is incomplete and the wasting of resources that the middle section overlength caused, improves economic nature.

In this embodiment, the overall width of the protective layer is not less than 8 times of the diameter of the pipeline 02, and further the overall width of the protective layer is 8 times to 12 times of the diameter of the pipeline 02, and the overall width of the protective layer in this scheme is 8 times of the diameter of the pipeline 02; the anterior segment width is 3/10 ~ 7/10 of middle section width, and this scheme anterior segment width is 1/2 of middle section width, the back end width is 2 times of anterior segment width at least, and further the back end width is 2 times 2 ~ 4 times of anterior segment width, and the back end width is 2 times of anterior segment width in this scheme. In order to resist sea waves, the protective layer needs to have enough coating size, the width of the whole protective layer is not less than 8 times of the diameter of the pipeline 02, the floating covering width (the width of the middle section) of the protective layer on the pipeline 02 is not less than 3 times of the diameter of the pipeline 02, then the width of the compaction pit is determined according to the slope ratio, if the width of the protective layer is too short, the impact of sea waves cannot be completely resisted, and if the width of the protective layer is too large, the resource waste is caused, meanwhile, the laying area of the pipeline 02 is limited, the protection effect has to be improved to resist the impact of sea waves and improve the protection of the pipeline 02 under the condition of ensuring shorter laying length, meanwhile, the interception effect of sand and stone can be improved by the rear section with the width larger than that of the front section, the front section mainly plays a role in reducing the impact of sea waves, a longer front section wastes a larger area, the protection effect and the economical efficiency can be improved through reasonable design in the scheme.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. A pipe protection construction comprising a foundation and a pipe, characterized in that: the pipeline protection device at least comprises a pipeline and a protection layer, wherein the protection layer at least comprises a geotextile layer covering the pipeline and a sand retaining layer covering the geotextile layer; the supporting layer is arranged between the pipeline and the geotechnical cloth layer, the two ends of the supporting layer in the radial direction respectively continue to extend towards the foundation to form a coating for the pipeline, and the part of the protective layer exposed out of the foundation is trapezoidal.

2. The pipe protective construction as claimed in claim 1, wherein: the sand-retaining layer at least comprises a gravel layer, a rock block layer and a twister king character block layer, wherein the particle size of the gravel layer is gradually increased, and the gravel layer, the rock block layer and the twister king character block layer are covered on the geotechnical cloth layer from bottom to top layer by layer.

3. The pipe protective construction as claimed in claim 1, wherein: the whole width of the protective layer is not less than 8 times of the diameter of the pipeline.

4. The pipe protective construction as claimed in claim 1, wherein: a compaction pit is dug at the offshore side of the foundation, and the pipeline is embedded at the rear side of the compaction pit along the sea wave erosion direction; the protective layer comprises an embedded section and a covering section, the covering section comprises a protective slope for resisting sea wave impact and an interception slope for preventing sand and stone loss, the protective slope is positioned on the front side of the covering section along the sea wave erosion direction, and the interception slope is positioned on the rear side of the covering section along the sea wave erosion direction; the protection slope extends towards the compaction pit to form an embedded section, and the embedded section is embedded into the compaction pit.

5. The pipe protective construction according to claim 4, wherein: the cross-section of compaction pit coastal wave erosion direction is down trapezoidal, two trapezoidal waist forms coastal waters slope and far-sea slope respectively, bury the section and cover in far-sea slope and extend along trapezoidal upper base and cover in trapezoidal upper base, bury the section and bury the compaction pit through natural sand soil backfill.

6. The pipe protective construction according to claim 5, wherein: the depth H of the compaction pit is not less than 1.5 times of the sea wave erosion depth of the design age; the slope ratio of the offshore slope is not more than 1/3 and the slope ratio of the open sea slope is not more than 1/3.

7. The pipe protective construction according to claim 6, wherein: the slope ratio of the protection slope is the same as that of a far sea slope, the slope ratio of the interception slope is larger than that of the protection slope, and the slope ratio of the interception slope is not larger than 1/2.

8. The pipe protective construction according to claim 4, wherein: prevent the bank protection and hold back still to be equipped with between the slope and cover in the buoyancy section of pipeline, the cover section is by the both ends of buoyancy section coastal wave erosion direction respectively correspond and protect the slope and hold back the slope and be connected the formation.

9. The pipe protective construction according to claim 8, wherein: the floating pressure section comprises a middle section covering right above the pipeline, a front section extending forwards from the middle section and connected to the protection slope, and a rear section extending backwards from the middle section and connected to the interception slope, and the middle section is formed by upward protruding of the floating pressure section, so that the top surface of the front section and the top surface of the rear section are not higher than the top surface of the middle section; the middle section is transited to the front section through a front slope and the middle section is transited to the rear section through a rear slope.

10. The pipe protective construction according to claim 9, wherein: the slope ratio of the front slope is not more than 1/2, the slope ratio of the rear slope is not more than 1/2, the pipeline is positioned in the middle of the middle section, the width of the middle section is not less than 3 times of the diameter of the pipeline, and the width of the rear section is at least 2 times of the width of the front section.