Buried pressure pipeline anti-push structure

Abstract

The utility model relates to the technical field of building and municipal engineering, in particular to an anti-push structure of a buried pressure pipeline. A buttress is arranged at a pipeline internal pressure direction changing node, a supporting structure is arranged on one side generating thrust, the buttress and the supporting structure are tightly attached or connected through a support and an enclosing purlin, undisturbed soil is arranged on the back face of the supporting structure, and the thrust is balanced through passive soil pressure of the undisturbed soil. The supporting structure can utilize fender posts during excavation and can also be driven separately. According to the scheme, the size of the buried pressure pipeline buttress can be greatly reduced, the original flexible connector connecting mode of the pipeline does not need to be changed, and therefore the construction cost is reduced, the construction progress is accelerated, and the advantages of being high in economical efficiency and simple in construction process are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of building and municipal engineering, and concretely relates to a buried pressure pipeline anti-push structure. BACKGROUND

[0002] In the building and municipal engineering, when the laying direction of the buried pressure pipeline with flexible interface changes, the bend node at the change position will be subjected to the push force caused by the internal pressure. The push force needs to be balanced with the resistance of the pier set at the bend or the constraint force between the pipeline and the soil body to avoid the flexible interface from slipping. In the city sensitive environment, setting the pipeline bend pier will occupy the underground space outside the pipeline, and the time for pouring and maintaining the pier is also long, which greatly influences the present traffic and other pipelines around. When the steel pipe rigid interface pipeline is replaced, the time required for on-site welding is long, the quality is difficult to control, and the detection is too complicated, which will also prolong the construction period and influence the surrounding environment. When the self-anchored interface pipeline is replaced, the manufacturing process is complex, and the required cost is often very high, so the economy is poor. Therefore, an effective anti-push structure that can effectively resist the push force, reduce the influence on the surrounding environment, and reduce the cost is urgently needed. SUMMARY

[0003] In order to solve the above problems, the utility model provides a buried pressure pipeline anti-push structure. The buried pressure pipeline anti-push structure is mainly composed of a pier, a supporting structure, a force transmission support and a surrounding purlin, and each part works cooperatively to resist the push force generated by the change of the internal pressure of the pipeline. The structure has the characteristics of small construction surface, good economy and simple construction process.

[0004] In order to achieve the above purpose, the utility model is realized by the following technical scheme:

[0005] A buried pressure pipeline anti-push structure, comprising:

[0006] A buried pressure pipeline, which generates a push force at the flexible interface due to the change of the internal pressure direction;

[0007] A pier, which is arranged at the internal pressure direction change node of the buried pressure pipeline;

[0008] A supporting structure, which is located on the side of the buried pressure pipeline subjected to the push force;

[0009] A force transmission assembly, which connects the pier and the supporting structure, and the force transmission assembly comprises a force transmission support and a surrounding purlin; or the pier is directly and closely combined with the supporting structure;

[0010] The back of the supporting structure is the original soil, and the push force generated by the buried pressure pipeline is transmitted to the supporting structure through the force transmission assembly or directly, and is balanced by the passive earth pressure of the original soil.

[0011] Further, when the trench construction surface width is less than a preset threshold, the buttress directly matches the support structure; when the trench construction surface width is greater than or equal to the preset threshold, the force transmission support connects the buttress and the support structure.

[0012] Further, the support structure is a temporary support pile formed when the trench is excavated, or a separately cast permanent support pile.

[0013] Further, the force transmission assembly is arranged in alignment on both sides of the center of the buried pressure pipeline.

[0014] Further, the buttress is in one of a concrete buttress, a steel buttress, a trapezoidal envelope buttress, and a semi-envelope buttress.

[0015] Further, the gap between the surrounding purlin and the support structure is filled and compacted with fine stone concrete.

[0016] Correspondingly, the utility model also provides a buried pressure pipeline anti-push structure construction method, comprising the following steps:

[0017] Setting buttresses at nodes and a certain range on both sides of a change in the laying direction of the pressure pipeline;

[0018] Setting a force transmission support and a surrounding purlin between the buttress and the support pile, or directly closely matching the buttress and the support pile, and the force transmission structure is preferably aligned with the center of the pipeline;

[0019] The number and range of the buttresses, the support piles, the force transmission supports, and the surrounding purlins are determined according to force calculation, and the calculation conditions include the pushing force generated by the pressure pipeline, the resistance of the support, and the resistance of the support pile and the soil; the above structures can be implemented inside the excavated trench, without the need to expand the construction surface.

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] The utility model can fully utilize the support structure when the trench is excavated, and a support pile can also be separately cast according to needs; the land occupation space of the support pile itself is very small, and the influence on the surrounding environment is controllable, and the utility model is particularly suitable for urban roads or sites with tight land use;

[0022] The utility model only needs to set the buttresses and the force transmission supports in the trench along with the pipeline backfill to resist the pushing force generated when the laying direction of the pressure pipeline changes, avoids the need to cast large-volume concrete due to the setting of large force buttresses, and also avoids the need to change the interface form of the pipeline to increase investment or risks, and therefore can produce good economic and social benefits;

[0023] The support structure can utilize the support piles of the buried pressure pipeline to be constructed once and used permanently. Taking the pipeline construction under the urban road as an example, without additional support structure, the disturbance to the surrounding soil is reduced, and the influence on the surrounding buildings, underground pipelines and traffic is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a plan view of one embodiment of the present application;

[0025] Figure 2 is a cross-sectional view of one embodiment of the present application.

[0026] In the figure, the numbers are: 1, buried pressure pipeline, 2, support pier, 3, force transmission support, 4, surrounding purlin, 5, support structure. DETAILED DESCRIPTION

[0027] The present application will be further described below in combination with the drawings and embodiments.

[0028] Please refer to Figure 1 and 2 . The specific embodiment of the buried pressure pipeline anti-push structure of the present application is as follows:

[0029] Trench excavation: perform the trench excavation operation of the buried pressure pipeline, and excavate to the design elevation of the base. During the excavation process, if the temporary support structure available on site is available, it should be properly protected for subsequent use as the support structure 5; if there is no available temporary support structure, according to the design requirements, select appropriate equipment and process to install the support pile as the support structure 5.

[0030] Support pier manufacturing: along with the laying of the pipeline 1, the support pier 2 is manufactured according to the design size and shape at the nodes where the direction of the pipeline 1 changes and within a certain range on both sides. The manufacturing material of the support pier 2 can be selected according to the actual engineering conditions, such as concrete, reinforced concrete, etc. During the manufacturing process, the strength and stability of the support pier 2 are ensured to meet the design requirements, and at the same time, the connection between the support pier 2 and the pipeline 1 is ensured to be firm and reliable.

[0031] Force transmission structure installation: when the trench construction surface is small, the support pier 2 is directly and closely attached to the support structure 5. When attached, the contact area between the two should be large enough and the contact should be close enough to ensure that the pushing force can be effectively transmitted. For the gaps existing in the attached surface, fine stone concrete or other suitable filling materials are used to fill up, so that the support pier 2 and the support structure 5 form a whole force system.

[0032] When the construction surface is large: if the trench construction surface is large, the force transmission support 3 and the surrounding purlin 4 need to be installed. First, the force transmission support 3 is installed, and the position and quantity thereof are determined according to the design, so as to ensure that the force transmission support 3 is aligned with the center of the pipeline, so as to uniformly transmit the thrust. Then, the surrounding purlin 4 is installed, and the surrounding purlin 4 should be closely combined with the supporting pile 5. For the gap between the two, fine stone concrete or other materials are used to fill, so as to ensure that the force transmission path is smooth, and the thrust generated by the change of the internal pressure of the pipeline 1 can be sequentially transmitted to the supporting structure 5 through the supporting pier 2, the force transmission support 3 and the surrounding purlin 4.

[0033] Trench backfilling: after the installation of the supporting pier 2, the force transmission support 3 and the surrounding purlin 4 (or the close combination of the supporting pier 2 and the supporting structure 5) is completed, the remaining part of the trench is backfilled. The backfilling material should meet the design requirements, and generally, medium-coarse sand, clay soil and the like can be selected. During the backfilling process, the construction is carried out according to the principle of layering and tamping, so as to ensure that the compactness of the backfilling soil reaches the design standard, so as to enhance the stability and reliability of the entire anti-thrust structure, and at the same time, the pipeline 1 and the components of the anti-thrust structure are protected from external damage.

[0034] Through the above steps, the utility model realizes the purpose of efficiently resisting the pipeline thrust by the passive earth pressure of the supporting structure, reduces the amount of concrete, shortens the construction period, and meets the needs of the narrow construction site in the city.

Claims

1. A push-resisting construction for a buried pressure pipeline, characterized in that The utility model relates to a buried pressure pipeline (1) and its supporting structure, which comprises: a buried pressure pipeline (1) that generates a pushing force at a flexible interface due to a change in internal pressure direction; a support pier (2) arranged at a change node of the internal pressure direction of the buried pressure pipeline (1); a supporting structure (5) located on the side of the buried pressure pipeline (1) subjected to the pushing force; a force transmission assembly connecting the support pier (2) and the supporting structure (5), which comprises a force transmission support (3) and a surrounding purlin (4); or the support pier (2) directly and closely abuts against the supporting structure (5); the back of the supporting structure (5) is original soil, and the pushing force generated by the buried pressure pipeline (1) is transmitted to the supporting structure (5) through the force transmission assembly or directly, and is balanced by the passive earth pressure of the original soil.

2. Push-resisting construction for a buried pressure pipeline according to claim 1, characterized in that, When the width of the trench construction surface is less than a preset threshold, the support pier (2) directly abuts against the supporting structure (5); when the width of the trench construction surface is greater than or equal to the preset threshold, the force transmission support (3) and the surrounding purlin (4) connect the support pier (2) and the supporting structure (5).

3. Push-resisting construction for a buried pressure pipeline according to claim 1, characterized in that, The supporting structure (5) is a temporary retaining pile formed when a trench is excavated, or a separately cast permanent retaining pile.

4. Push-resisting construction for a buried pressure pipeline according to claim 1, characterized in that, The force transmission assembly is arranged in alignment on both sides of the center of the buried pressure pipeline (1).

5. Push-resisting construction for a buried pressure pipeline according to claim 1, characterized in that, The support pier (2) has one of the following structural forms: a concrete support pier, a steel structure support pier, a trapezoidal enclosed support pier, or a semi-enclosed support pier.

6. Push-resisting construction for a buried pressure pipeline according to claim 1, characterized in that, The gap between the surrounding purlin (4) and the supporting structure (5) is filled with dense fine stone concrete.

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