CN114215961B - A construction method suitable for pipeline engineering support structures in landslide areas - Google Patents

Abstract

The invention discloses a construction method suitable for a pipeline engineering supporting structure in a landslide area, wherein the supporting structure comprises a ditch, a pipeline and a supporting structure; the ditch is buried under the ground, the pipeline is placed in the ditch, shock absorbing pieces are arranged between the pipeline and the two inner walls of the ditch, and the shock absorbing pieces comprise a plurality of shock absorbing pieces which are arranged at intervals; the supporting structure comprises anti-slide piles positioned at two sides of the ditch, and connecting beams are poured at the tops of the anti-slide piles; the anti-slide pile close to one side of the mountain is also connected with a prestressed anchor rod, and an anchoring section of the anchor rod penetrates through the sliding surface to be fixed on a landslide stratum. The construction method comprises the following steps: 1) Construction of the slide-resistant pile; 2) Constructing a prestressed anchor rod; 3) Constructing a pipe ditch; 4) Installing a pipeline; 5) Backfilling a pipeline; 6) Constructing a connecting beam; 7) Stretching and locking the anchor rod; the miniature anti-slip pile groups on the two sides of the pipeline not only can balance the thrust of the landslide slide body, but also can bear the load function of the river side, so that the pipeline is effectively protected in the landslide deformation process, and the pipeline is prevented from deformation and damage.

Description

A construction method suitable for pipeline engineering support structures in landslide areas

Technical field

The invention belongs to the field of construction technology, and specifically relates to a construction method suitable for pipeline engineering support structures in landslide areas.

Background technique

During pipeline construction, it is inevitable to cross the landslide development area in the topsoil. Although the landslide was controlled in the early stage of construction, the landslide was kept in a stable state. However, under the influence of factors such as heavy rainfall or earthquakes, the surface soil will creep or move significantly, causing small-scale landslides. Due to the movement of the surface soil, the pipeline will be deformed and even broken, causing major harm to the pipeline operation and the surrounding environment. Therefore, it is very necessary to take reasonable protective measures for pipelines in surface soil landslide areas.

Contents of the invention

The present invention provides a construction method suitable for pipeline engineering support structures in landslide areas, aiming to solve the above technical problems.

To this end, the present invention adopts the following technical solutions:

A construction method suitable for supporting structures of pipeline projects in landslide areas, specifically according to the following steps:

1) Anti-slide pile construction: According to the pipeline construction drawing, drill holes vertically on the left and right sides of the pipeline along the direction of the pipeline extension to form pile holes, and pour concrete in the pile holes to form anti-slide piles;

2) Prestressed anchor construction: After the anti-slide pile maintenance is completed, the prestressed anchors are connected to the top of the anti-slide piles on the side of the mountain, and the anchoring section of the anchor rod passes through the sliding surface and is fixed to the landslide bedrock layer;

3) Pipe trench construction: Excavate a trench for placing pipes between two rows of anti-slide piles, and construct a pipe trench in the trench;

4) Pipeline installation: After the construction of the pipe trench is completed, the pipe is lifted and placed in the pipe trench; shock-absorbing parts are installed at intervals on the pipe, and the shock-absorbing parts are located between the pipe and the two side walls of the trench; the shock-absorbing parts include The straight plate, spring and arc plate are fixed in sequence, the straight plate is close to the side wall of the ditch, and the arc plate is close to the outer wall of the pipe;

5) Pipe backfilling: Place a trench cover on the top of the trench, then backfill the trench to bury the trench beneath the surface;

6) Construction of connecting beams: tie connecting bars on top of two rows of anti-slide piles to form a steel mesh. Fix the formwork around the steel mesh and then pour concrete to form a connecting beam. During pouring, anchor holes are reserved on the connecting beams;

7) Anchor tension and locking: After the connecting beam is firmly formed, set a pedestal on the connecting beam and tension and lock the anchor (6).

Furthermore, at least two rows of anti-slide piles are built near the side of the mountain.

Further, the anti-slide piles are micro-threaded piles.

Further, the concrete poured in the pile hole is chopped basalt fiber concrete.

Further, the outer wall of the pipeline is covered with EPS flexible material.

Furthermore, the surface of the spring is covered with waterproof and anti-corrosion material.

The beneficial effects of the present invention are:

1. The anti-slide piles on both sides of the pipeline can not only balance the thrust of the mountain side sliding body, but also balance the load on the river side, effectively protect the pipeline during the landslide deformation process, and effectively prevent pipeline deformation and damage;

2. Use threaded piles as anti-slide piles, which are easy to construct, have less soil discharge, no vibration, little disturbance to the surrounding soil, and have a squeezing effect on the surrounding soil. They not only play a supporting role but also strengthen the landslide soil itself. stability;

3. The threaded pile body is made of chopped basalt fiber concrete material. Compared with traditional plain concrete threaded piles, its crack resistance and impact resistance can be improved, thereby increasing the normal service life of the pipeline;

4. The connecting beam connects the anti-slide piles on both sides of the pipeline into a common reinforcement, improving the support performance of the support structure;

5. The outer circumference of the pipeline is covered with EPS flexible material to prevent pipeline damage and cracks during construction; shock absorbers are installed on both sides of the pipeline to effectively buffer the landslide thrust, reduce pipeline vibration, and effectively protect pipeline safety.

Description of the drawings

Figure 1 is a schematic structural diagram of the pipeline of the present invention;

Figure 2 is a schematic structural diagram of the shock absorber of the present invention;

Figure 3 is a schematic cross-sectional view of the anti-slide pile of the present invention;

In the picture: 1-anti-slide pile, 2-pipe trench, 3-pipe, 4-shock absorbing parts, 41-straight plate, 42-spring, 43-arc plate, 5-connecting beam, 6-anchor rod.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings:

A construction method suitable for supporting structures of pipeline projects in landslide areas, specifically according to the following steps:

1) Construction of anti-slide piles: First, plan the direction of the pipeline in the landslide area, draw the pipeline design and construction drawings, determine the burial depth of pipeline 3, and determine the depth of the pile hole and construction location according to the burial depth; the pile driver is put in place, and the pile driver is put in place according to the pipeline design According to the construction drawing, holes are drilled vertically on the left and right sides of Pipe 3 along the direction of the pipeline extension to form pile holes; in order to improve the support and anti-slip performance, at least two rows of pile holes can be drilled on the side of the mountain;

When drilling, the pile driver controls the drill rod to align with the designed pile position, starts the pile driver, and controls the hollow drill rod to descend. The relationship between the drill rod descending speed and the rotation speed is: each time the drill rod descends by one pitch, it rotates clockwise for one revolution at the same time; When reaching the design depth, the relationship between the rising speed of the drill pipe and the rotation speed is: each time the drill pipe rises by one pitch, it rotates counterclockwise for one revolution at the same time, thus forming a more complete threaded pile hole. While the drill pipe is rising, chopped basalt fiber concrete is injected into the hole through the grouting pipe in the hollow drill pipe. After the concrete solidifies, an anti-slide pile 1 is formed;

Mixing of chopped basalt fiber concrete: Use a forced mixer. When mixing, add the fiber, sand, stone, cement, etc. to the mixer at the same time. Dry mix first and then wet mix. The mixing time is strictly in accordance with the specifications to ensure that the fibers can be mixed evenly in the concrete.

2) Prestressed anchor construction: After the maintenance of the anti-slide pile 1 is completed, a prestressed anchor 6 with an inclined angle is set on the top plane of the anti-slide pile 1 close to the mountain side, and the anchor section of the anchor 6 is fixed through the sliding surface. in the landslide bedrock layer. The prestressed anchor rod 6 with an inclined angle can increase the tensile force, thereby increasing the lateral compressive strength of the anti-slide pile 1.

3) Pipe trench construction: Excavate a trench for placing pipeline 3 between two rows of anti-sliding piles 1, and the excavation depth is greater than the marked depth of pipeline 3; construct concrete pipe trench 2 in the trench, and the horizontal direction of concrete pipe trench 2 The cross-section is rectangular or U-shaped. In order to shorten the construction period, the concrete pipe trench 2 can use prefabricated parts; during construction, the prefabricated parts are placed closely in the trench one after another, and concrete is poured at the interface of the two prefabricated parts to improve the connection strength of the prefabricated parts.

4) Pipeline installation: After the pipe trench construction is completed, pipe 3 is lifted and placed in pipe trench 2. Pipeline 3 needs to be placed centrally in the center of pipe trench 2. Then install the shock-absorbing parts 4 on the pipe 3, and the adjacent shock-absorbing parts 4 are spaced 0.8-1.5m apart. The shock absorber 4 includes a straight plate 41, a spring 42 and an arc plate 43 that are fixedly connected in sequence. The curvature of the arc plate 43 matches the outer wall of the pipeline 3; the straight plate 41 is close to the side wall of the ditch, and the arc plate 43 is close to the outer wall of the pipeline 3 (as shown in the figure) shown in 2). The shock-absorbing part 4 is used to improve the stability of the pipeline 3. During an earthquake, the shock-absorbing part 4 plays a buffering role, which can reduce the swing amplitude of the pipe 3 in the left and right directions and prevent the pipe 3 from cracking or even breaking due to excessive amplitude. . In addition, since the pipeline 3 vibrates at a small amplitude during the transportation of materials, the shock absorber 4 can also reduce the amplitude of the pipeline 3, prevent micro-cracks in the pipeline 3, and increase the life of the pipeline 3.

In addition, the outer wall of the pipe 3 is covered with EPS flexible material to prevent damage to the pipe 3 during lifting; the surface of the spring 42 is covered with waterproof and anti-corrosion materials to prevent the elasticity of the spring 42 from decreasing due to rust and increase the service life of the spring 42.

5) Pipe backfilling: Place a trench cover above the pipe trench 2. No concrete is required to be poured between the trench covers to facilitate later maintenance of pipeline 3. Then backfill the trench, compact the backfill soil, and expose the pile head of the anti-slip pile 1 to the rammed soil. outside.

6) Construction of connecting beam: tie the connecting bars on the top of the anti-slide pile 1 to form a steel mesh. The steel mesh completely covers the anti-slide piles 1 on both sides; fix the formwork around the steel mesh and then pour it to form the connecting beam 5; pay attention when pouring Cover the PVC pipe at the end of anchor rod 6, leaving an anchor hole.

7) Anchor rod tensioning and locking: After the connecting beam 5 is formed and stabilized, a pedestal is set on the connecting beam 5 and the anchor rod 6 is tensioned and locked to complete the construction operation.

Claims (1)

1. A construction method suitable for pipeline engineering support structures in landslide areas, which is characterized by following the following steps: 1) Anti-slide pile construction: According to the pipeline construction drawing, drill holes vertically on the left and right sides of the pipe (3) along the extension direction of the pipe (3) to form pile holes, and pour concrete in the pile holes to form the anti-slide piles (1); At least two rows of anti-slide piles (1) are built on one side of the mountain, and the anti-slide piles (1) are micro-threaded piles; the concrete poured in the pile holes is chopped basalt fiber concrete; 2) Construction of prestressed anchors: After the maintenance of the anti-slide piles (1) is completed, connect the prestressed anchors (6) to the top of the anti-slide piles (1) on the side of the mountain, and pass the anchoring section of the anchors (6) through The sliding surface is fixed to the landslide bedrock layer; 3) Pipe trench construction: Excavate a trench for placing the pipeline (3) between the two rows of anti-slide piles (1), and construct the pipe trench (2) in the trench; 4) Pipeline installation: After the construction of the pipe trench (2) is completed, the pipe (3) is lifted and placed in the pipe trench (2). The outer wall of the pipe (3) is covered with EPS flexible material; the upper spacer installation of the pipe (3) reduces the The shock absorbing member (4) is located between the pipe (3) and the two side walls of the trench; the shock absorbing member (4) includes a straight plate (41), a spring (42) and a spring (42) that are fixedly connected in sequence. The arc plate (43) and the straight plate (41) are close to the side wall of the trench, and the arc plate (43) is close to the outer wall of the pipe (3); the surface of the spring (42) is covered with waterproof and anti-corrosion materials; 5) Pipeline backfilling: Place a trench cover on the top of the pipe trench (2), then backfill the trench, and bury the pipe trench (2) beneath the surface; 6) Construction of connecting beams: tie connecting bars on top of two rows of anti-sliding piles (1) to form a steel mesh. Fix the formwork around the steel mesh and pour concrete to form connecting beams (5). During pouring, reserve the connecting beams (5). Anchor hole; 7) Anchor tension locking: After the connecting beam (5) is firmly formed, set a pedestal on the connecting beam (5) and tension and lock the anchor rod (6).