A composite foundation system for buried pipelines

Abstract

The application provides a buried pipeline composite foundation system, which comprises a supporting foundation arranged in a soil body, the supporting foundation comprising a base, the base being provided with a concave part in an arc-shaped cross section, and a plurality of holes being arranged on the concave part; and further comprising a flexible isolation layer, a filler layer and a pipeline which are sequentially arranged from outside to inside on the inner side of the concave part, the flexible isolation layer being capable of flexible deformation and having a drainage performance; the filler layer being capable of being in contact with the soil body through the holes under the wrapping of the flexible isolation layer, and transmitting the load on the pipeline to the soil body. The buried pipeline composite foundation system can effectively improve the overall mechanical properties of the buried flexible pipeline, solve the damage and diseases caused by the uneven settlement of the uneven foundation under the common pipeline, and increase the service life of the pipeline; the use amount of building materials can be obviously reduced, the construction speed can be improved, and the engineering cost can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of buried pipeline, in particular to a buried pipeline composite foundation system. BACKGROUND

[0002] With the expansion of city size, the demand for pipeline construction is increasing. In the conventional design of buried pipeline structure, for flexible pipeline, a trench is usually excavated in the soil, the pipeline is installed in the trench, and medium-coarse sand foundation and dock are backfilled under and around the pipeline and then compacted, so that the pipeline upper load is borne by the soil and pipeline together, to achieve the purpose of protecting the pipeline and controlling the uneven settlement of the pipeline.

[0003] In actual construction, medium-coarse sand filler is backfilled in the entire width range of the trench, and the amount of medium-coarse sand is large and the construction speed is slow; in the later pipeline operation process, the medium-coarse sand foundation and the pipeline have no integrity in the vertical direction and have poor deformation coordination ability. When the additional load of the pipeline and the compression performance of the soil layer change greatly, the uneven settlement of the pipeline is often difficult to control, which easily causes damage to the pipeline structure and functional defects. SUMMARY

[0004] In view of the above defects, the purpose of the present application is to provide a buried pipeline composite foundation system to solve the damage problem caused by excessive pipeline deformation and uneven settlement, and to reduce the construction cost and shorten the construction period to a certain extent.

[0005] The present application provides a buried pipeline composite foundation system, which comprises a supporting foundation arranged in the soil, the supporting foundation comprising a base, the base being provided with a concave portion with an arc-shaped cross section, and a plurality of holes being formed in the concave portion; and further comprising a flexible isolation layer, a filler layer and a pipeline which are sequentially arranged from outside to inside on the inner side of the concave portion, the flexible isolation layer being flexible and having drainage performance; the filler layer being in contact with the soil through the holes under the wrapping of the flexible isolation layer, and transmitting the load on the pipeline to the soil.

[0006] Preferably, the supporting foundation is made of polyethylene.

[0007] Preferably, the supporting foundation further comprises a plurality of stiffening ribs which are arranged at the bottom of the concave portion and are spaced apart along the extension direction of the concave portion.

[0008] Preferably, a plurality of anti-skid teeth are further arranged on the concave portion, and the anti-skid teeth are used to resist the horizontal thrust on the pipeline.

[0009] Preferably, a connecting beam is arranged between two adjacent anti-skid teeth along the extension direction of the concave portion.

[0010] Preferably, one end of the recess is provided with a connecting groove along the extension direction of the recess, and the other end is provided with a connecting piece inserted into the connecting groove.

[0011] Preferably, the flexible isolation layer comprises geotextile.

[0012] Preferably, the filler layer comprises medium-coarse sand.

[0013] The buried pipeline composite foundation system of the present application can effectively improve the overall mechanical properties of the buried flexible pipeline, solve the damage and disease caused by the uneven subsoil differential settlement under the pipeline, and increase the service life of the pipeline; can significantly reduce the amount of building materials, improve the construction speed, and effectively reduce the engineering cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Fig. 1 is a cross-sectional view of the buried pipeline composite foundation system of the present application;

[0015] Figure 2 Fig. 4 is a structural schematic view of the supporting foundation.

[0016] Element number explanation:

[0017] 1 pipeline

[0018] 2 filler layer

[0019] 3 flexible isolation layer

[0020] 4 supporting foundation

[0021] 41 recess

[0022] 411 hole

[0023] 412 connecting groove

[0024] 413 connecting piece

[0025] 42 stiffening rib

[0026] 43 anti-skid tooth

[0027] 44 connecting beam

[0028] 45 base DETAILED DESCRIPTION

[0029] The specific embodiments of the present application will be further described in detail below in conjunction with the drawings. These embodiments are only used to illustrate the present application, and are not a limitation on the present application.

[0030] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "horizontal", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0033] Figure 1 The cross-sectional view of the composite foundation system of the buried pipeline of the present application is shown, and in the following description, the drawings in Figure 1 are taken as the reference basis of the direction, and in Figure 1 , the front direction is outward perpendicular to the view paper, the back direction is inward perpendicular to the view paper, the upward direction is upward along the view paper, the downward direction is downward along the view paper, the right direction is right along the view paper, and the left direction is left along the view paper.

[0034] As shown in Figure 1 and Figure 2 , the present application provides a composite foundation system of buried pipeline, which comprises a supporting foundation 4 arranged in the soil body, the supporting foundation 4 comprises a base 45, and the base 45 is provided with a concave portion 41 with an arc-shaped cross section. A plurality of spaced-apart holes 411 are formed in the concave portion 41. The above-mentioned supporting foundation 4 can be directly placed on the natural foundation at the bottom of the buried pipeline trench, and the peripheral space of the supporting foundation 4 in the trench can be backfilled with excavated soil. The holes 411 are used to communicate the inner side of the concave portion 41 and the soil body outside the concave portion 41.

[0035] The system further comprises a flexible isolation layer 3, a filler layer 2 and a pipeline 1 arranged in the recess 41 from outside to inside. The pipeline 1 is preferably a flexible pipeline. The filler layer 2 is arranged on the outer circumferential side of the lower half of the pipeline 1, and the flexible isolation layer 3 is arranged between the filler layer 2 and the inner side of the recess 41. The flexible isolation layer 3 is flexible and has a drainage function, which can prevent the filler layer 2 from being lost, help drainage and avoid the pipeline 1 from floating. The drained water can flow into the soil through the holes 411. During operation of the system, the filler layer 2 can be compacted in contact with the soil through the holes 411 under the wrapping of the flexible isolation layer 3, and the load on the pipeline 1 is transmitted to the soil.

[0036] As can be seen from the above, the buried pipeline composite foundation system composed of the filler layer 2, the flexible isolation layer 3 and the supporting foundation 4 can effectively improve the overall rigidity of the pipeline 1 and the filler layer 2 arranged on the outer periphery of the pipeline 1, increase the bearing capacity of the upper load and reduce the structural deformation of the pipeline 1. At the same time, the buried pipeline composite foundation system is connected in sequence to form a whole in the vertical direction, the displacement between pipe sections is limited by the lower part of the pipeline 1, and the damage caused by the differential settlement of the uneven subsoil under the buried pipeline is reduced. Different from the prior art which uses the scheme of laying filler with full width during trench backfilling, the buried pipeline composite foundation system of the present application is arranged in the trench, and only the filler layer 2 needs to be arranged inside the supporting foundation 4, which reduces the amount of filler and the amount of soil to be discarded outside, and the supporting foundation 4 is a prefabricated structure, which is simple to assemble and construct and can effectively improve the construction speed. The present application can effectively solve the damage problem caused by excessive deformation and uneven settlement of the pipeline in the prior art, and can reduce the construction cost and shorten the construction period to a certain extent.

[0037] In a preferred embodiment of the present application, the filler layer 2 comprises medium-coarse sand. The medium-coarse sand has the advantages of not sinking, not deforming and little shrinkage, and backfilling with medium-coarse sand can prevent the pipeline 1 from being damaged during extrusion by external force. At the same time, the medium-coarse sand can also ensure that the gravity load of the pipeline 1 has a certain stress diffusion angle, so as to avoid uneven settlement of the supporting foundation 4. Those skilled in the art can also select sand or other graded fillers that meet the relevant engineering standard technical requirements according to needs.

[0038] The flexible isolation layer 3 preferably comprises geotextile, such as non-woven geotextile, woven geotextile and other geosynthetic materials with drainage function. The geotextile has good tensile strength, tear resistance, impact resistance and ultimate elongation, and also has good corrosion resistance and anti-microbial erosion resistance in soil, which is equivalent to a barrier that can prevent the filler layer 2 from being lost and allow water to flow, which is helpful for timely drainage; by maintaining uniform stress in a large area, the geotextile plays a role in enhancing the structure of the system and reducing soil loss.

[0039] The support base 4 is made of polyethylene (HDPE) or other chemical composites. A plurality of holes 411 are arranged on the recess 41 at equal intervals, which can make the stress and deformation of the support base 4 more uniform. The shape of the holes 411 is not limited, which can be circular, rectangular, etc.

[0040] In another preferred embodiment of the present application, as shown in Figure 2 The support base 4 further includes a plurality of stiffening ribs 42 arranged at equal intervals on the bottom of the recess 41 along the extension direction of the recess 41 (i.e. the front-rear direction). The stiffening ribs 42 are used to support the recess 41 and improve the structural stability of the recess 41. A plurality of anti-skid teeth 43 are arranged on the recess 41, which are used to resist the horizontal thrust on the pipeline 1. Further, one anti-skid tooth 43 is arranged on the left and right sides of each stiffening rib 42 and connected with the recess 41. The anti-skid tooth 43 is specifically a plate body extending in the up-down direction. Along the extension direction of the recess 41, the plurality of anti-skid teeth 43 are arranged at equal intervals, which can make the stress and deformation of the support base 4 more uniform. In order to improve the overall stress performance of the support base 4, a connecting beam 44 is arranged between the adjacent two anti-skid teeth 43 along the extension direction of the recess 41.

[0041] Further, in order to adapt to various lengths of pipelines, the buried pipeline composite foundation system provided by the present application includes a plurality of support bases 4. In each support base 4, one end of the recess 41 is provided with a connecting groove 412, and the other end is provided with a connecting piece 413 matched with the connecting groove 412. Through the matching of the connecting groove 412 and the connecting piece 413, the plurality of support bases 4 can be connected end to end in sequence, which makes the assembly more convenient and efficient. The structure of the connecting piece 413 is not limited, which can be an arc-shaped plate, a rectangular plate or a buckle, etc.

[0042] The above is only the preferred embodiment of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and replacements can be made, which should be considered as the protection scope of the present application.

Claims

1. A composite foundation system for a buried pipeline, characterized by, The supporting foundation (4) is arranged in the soil body, and the supporting foundation (4) comprises a base (45) provided with a concave portion (41) with an arc-shaped cross section, and a plurality of holes (411) are arranged in the concave portion (41); a flexible isolation layer (3), a filler layer (2) and a pipeline (1) are sequentially arranged in the concave portion (41) from outside to inside, the flexible isolation layer (3) is flexible and has a drainage performance; the filler layer (2) is in contact with the soil body through the holes (411) under the wrapping of the flexible isolation layer (3), and the load on the pipeline (1) is transmitted to the soil body.

2. The buried pipeline composite foundation system according to claim 1, wherein, The supporting foundation (4) is made of polyethylene.

3. The buried pipeline composite foundation system according to claim 1, wherein, The supporting foundation (4) further comprises a plurality of stiffening ribs (42) arranged at the bottom of the concave portion (41) and spaced along the extension direction of the concave portion (41).

4. The buried pipeline composite foundation system according to claim 1, wherein, A plurality of anti-skid teeth (43) are further arranged on the concave portion (41), and the anti-skid teeth (43) are used to resist the horizontal thrust on the pipeline (1).

5. The buried pipeline composite foundation system according to claim 4, wherein, Along the extension direction of the concave portion (41), a connecting beam (44) is arranged between two adjacent anti-skid teeth (43).

6. The buried pipeline composite foundation system of claim 1, wherein, Along the extension direction of the concave portion (41), one end of the concave portion (41) is provided with a connecting groove (412), and the other end is provided with a connecting piece (413) matched with the connecting groove (412).

7. The buried pipeline composite foundation system according to claim 1, wherein, The flexible isolation layer (3) comprises a geotextile.

8. The buried pipeline composite foundation system of claim 1, wherein, The filler layer (2) comprises medium-coarse sand.

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