Narrow groove pipeline installation backfilling structure system

Abstract

The utility model relates to a narrow groove pipeline installation backfilling structure system which comprises an installation positioning support, a cast-in-place foundation, a water pumping and draining system and a backfilling structure layer, the cast-in-place foundation is arranged below the installation positioning support, the installation positioning support comprises an arc-shaped supporting plate, a bearing plate and supporting screw rods, and the supporting screw rods are arranged at the four corners of the bearing plate. The supporting screw penetrates through the cast-in-place foundation and is inserted into a soil body at the bottom of a pipeline groove, the bearing plate is supported on the cast-in-place foundation, the arc-shaped supporting plate is supported above the bearing plate, the pipeline is supported on the arc-shaped supporting plate, the backfill structure layer comprises a tamping sand layer on the lower portion of the groove 1 and a clay sealing layer on the upper portion of the groove 1, and the water pumping and draining system comprises a water injection pipe, a water pumping pipe and inverted filter geotechnical cloth. The water pumping pipe is arranged below the sand layer to be tamped, water is injected into the sand layer to be tamped through the water injection pipe and pumped out through the water pumping pipe, the sand layer to be tamped is tamped through the hydraulic tamping effect, and the inverted filter geotechnical cloth is arranged among the groove bottom, the surface of the groove wall and the backfill structure layer, so that water and soil loss around the pipeline is avoided.

Description

Technical Field

[0001] The utility model relates to the construction of backfilling of pipeline trenches, in particular to an installation and backfilling structure system for pipelines in narrow trenches. Background Art

[0002] When carrying out the installation of municipal pipelines, it is usually necessary to first excavate a trench, carry out operations such as installing and docking pipelines in the trench, and then backfill the trench. Since the drainage pipeline is a linear project with segments spliced one by one, it is difficult to control the elevation of the entire pipeline. Therefore, the elevation of the head and tail segments or several nodes is usually controlled. This method is likely to form low-lying areas or steep slopes in the pipeline, which not only affects the drainage efficiency of the pipeline, but also easily accumulates sediment and blocks the pipeline after long-term use. In addition, in some areas with limited space, the excavation width of the trench is small, resulting in that the operators cannot enter the trench to carry out operations such as trench foundation ramming, pipeline installation, docking, and subsequent backfilling, which is likely to cause situations such as foundation settlement and slippage of pipeline segments. In addition, mechanical equipment cannot be used for ramming during the backfilling operation, and the compaction degree of the trench backfilling is insufficient, which is likely to cause settlement of the road surface. Summary of the Utility Model

[0003] The purpose of the utility model is to propose an installation and backfilling structure system for pipelines in narrow trenches aiming at the problems of difficult pipeline installation and insufficient compaction degree of trench backfilling caused by narrow pipeline trenches due to limited construction space. To achieve the purpose, the utility model adopts the following technical solutions:

[0004] The installation and backfilling structure system for pipelines in narrow trenches involved in the utility model includes an installation positioning bracket, a cast-in-place foundation, a drainage system, and a backfilling structure layer. The cast-in-place foundation is arranged below the installation positioning bracket. The installation positioning bracket includes an arc-shaped support plate, a bearing plate, and support screws. The support screws are arranged at the four corners of the bearing plate. The support screws pass through the cast-in-place foundation and are inserted into the soil at the bottom of the pipeline trench. The bearing plate is supported on the cast-in-place foundation. The arc-shaped support plate is supported above the bearing plate. The pipeline is supported on the arc-shaped support plate. The backfilling structure layer includes a rammed sand layer at the lower part of the trench and a clay sealing layer at the upper part. The drainage system includes a water injection pipe, a water extraction pipe, and an anti-filter geotextile. The water extraction pipe is arranged below the sand layer to be rammed. Water is injected into the sand layer to be rammed through the water injection pipe and extracted through the water extraction pipe. The sand layer to be rammed is rammed through the hydraulic ramming effect. The anti-filter geotextile is arranged between the surface of the trench bottom, the trench wall, and the backfilling structure layer to prevent water and soil loss around the pipeline.

[0005] Preferably, longitudinal and transverse support ribs are arranged below the arc-shaped support plate to support the arc-shaped support plate and transfer the load thereon to the bearing plate; a rubber cushion layer is arranged above the arc-shaped support plate to increase the contact area with the pipeline and form a stress buffer layer between the arc-shaped support plate and the pipeline.

[0006] Preferably, the cast-in-place foundation is composed of a steel bar mesh and cast-in-place concrete. By setting the cast-in-place reinforced concrete foundation, the bearing capacity of the foundation structure is improved, and settlement caused by insufficient bearing capacity of the bottom of the trench is avoided.

[0007] Preferably, an adjusting nut is provided on the support screw rod, and the bearing plate is adjusted to the design elevation by screwing the adjusting nut; through holes are provided on the bearing plate to facilitate pouring concrete under the bearing plate through the through holes, and the phenomenon of voids under the bearing plate is avoided.

[0008] Preferably, a perforated water collecting pipe is provided below the water extraction pipe, and the perforated water collecting pipe is wrapped with an anti-filter geotextile to prevent backfill materials from flowing out through the perforated water collecting pipe.

[0009] Preferably, cement mortar is injected into the water extraction pipe and the perforated water collecting pipe. After the trench is backfilled to the design height, a clay sealing layer is backfilled and mechanically compacted. Before the construction of the clay sealing layer, cement mortar is injected into the water extraction pipe and the perforated water collecting pipe for sealing.

[0010] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0011] 1. An installation positioning bracket is adopted to assist the pipeline installation operation. First, the installation positioning bracket is set at the bottom of the trench, and the elevation is adjusted through the adjusting nut, and then the pipeline is directly erected on the arc-shaped support plate of the installation positioning bracket, which improves the control accuracy of the pipeline elevation, reduces the difficulty of operation in narrow spaces and the on-site operation efficiency.

[0012] 2. The installation positioning bracket is borne on the cast-in-place foundation, and the cast-in-place foundation is a reinforced concrete structure, which evenly transfers the pipeline load to the bottom of the trench and avoids settlement caused by insufficient bearing capacity.

[0013] 3. The trench backfill uses gravel materials and is compacted by water injection, which solves the problem that backfill operations cannot be carried out in narrow trenches; in addition, water extraction pipes are arranged layer by layer to quickly extract the water in the backfill materials, accelerate the compaction of the backfill layer, and prevent water from flowing into the soil at the bottom of the trench and reducing the bearing capacity of the foundation.

[0014] 4. A clay sealing layer is provided above the trench, and anti-filter geotextiles are provided between the bottom, side walls and backfill layer of the trench to prevent water flow from scouring and carrying away the backfill materials, improve the durability and stability of the trench backfill structure, and ensure the safety during the pipeline operation period. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional view of the pipeline installation and backfill structure system in a narrow trench;

[0016] Figure 2 is a top view of the installation of the positioning installation bracket and the drainage system;

[0017] Figure 3This is a schematic diagram of the backfilling structure for narrow trench pipeline installation;

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the installation positioning bracket;

[0019] Figure 5 This is the large-scale drawing of the installation of the positioning bracket;

[0020] Figure 6 This is a large-scale drawing of the pumping pipe structure.

[0021] Markings in the figure: 1-groove, 11-groove bottom, 12-groove wall, 21-arc support plate, 22-support rib, 23-rubber cushion, 24-bearing plate, 25-through hole, 26-support screw, 27-adjusting nut, 31-steel mesh, 32-concrete, 41-water injection pipe, 42-water pumping pipe, 43-porous water collecting pipe, 44-anti-filter geotextile, 45-cement mortar, 51-pipeline, 52-compacted sand layer, 53-sand layer to be compacted, 54-clay sealing layer. DETAILED DESCRIPTION

[0022] In order to deepen the understanding of the present invention, the following reference will be made to the attached Figure 1 To Attachment Figure 6 , the embodiments of the utility model are described in detail. The following embodiments are implemented on the premise of the technical scheme of the utility model, and detailed implementation methods are given, but the protection scope of the utility model is not limited to the following embodiments.

[0023] As attached Figure 1 , 2 As shown, the utility model relates to a narrow groove pipeline installation backfill structure system, including an installation positioning bracket, a cast-in-place foundation, a drainage system, and a backfill structure layer. The cast-in-place foundation is arranged below the installation positioning bracket, and the installation positioning bracket includes an arc-shaped support plate 21, a bearing plate 24, and a support screw 26. The support screw 26 is arranged at the four corners of the bearing plate 24. The support screw 26 passes through the cast-in-place foundation and is inserted into the soil body of the bottom 11 of the pipeline groove 1. The bearing plate 24 is supported on the cast-in-place foundation, and the arc-shaped support plate 21 is supported above the bearing plate 24. The pipeline 51 supports On the arc-shaped support plate 21, the backfill structure layer includes a compacted sand layer 52 at the bottom of the trench 1 and a clay sealing layer 54 at the top. The drainage system includes an injection pipe 41, a pumping pipe 42 and a geotextile 44. The pumping pipe 42 is arranged below the sand layer 53 to be compacted. Water is injected into the sand layer 53 to be compacted through the injection pipe 41 and pumped out through the pumping pipe 42. The sand layer 53 to be compacted is compacted by hydraulic compaction. The geotextile 44 is arranged between the surface of the trench bottom 11, the trench wall 12 and the backfill structure layer to avoid soil and water loss around the pipeline.

[0024] As attached Figure 4As shown, longitudinal and transverse support ribs 22 are provided below the arc-shaped support plate 21 of the installation positioning bracket to support the arc-shaped support plate 21 and transfer the load thereon to the bearing plate 24; a rubber cushion layer 23 is provided above the arc-shaped support plate 21 to increase the contact area with the pipeline 51 and form a stress buffer layer between the arc-shaped support plate 21 and the pipeline 51. Preferably, an adjusting nut 27 is provided on the support screw 26, and the bearing plate 24 is adjusted to the design elevation by turning the adjusting nut 27; through holes 25 are provided on the bearing plate 24 to facilitate pouring concrete 32 under the bearing plate 24 through the through holes 25 to avoid the phenomenon of voids under the bearing plate 24.

[0025] As shown in the Figure 5 attachment, the cast-in-place foundation is composed of a steel bar mesh 31 and cast-in-place concrete 32. By setting the cast-in-place reinforced concrete foundation, the bearing capacity of the foundation structure is improved, and settlement caused by insufficient bearing capacity of the trench bottom 11 is avoided.

[0026] As shown in the Figure 6 attachment, a porous water collecting pipe 43 is provided below the water extraction pipe 42, and the porous water collecting pipe 43 is wrapped with an anti-filter geotextile 44 to prevent the backfill material from flowing out through the porous water collecting pipe 43. As shown in the Figure 4 attachment, cement mortar 45 is injected into the water extraction pipe 42 and the porous water collecting pipe 43. After the trench 1 is backfilled to the design height, a clay sealing layer 54 is backfilled and mechanically compacted. Before the construction of the clay sealing layer 54, cement mortar 45 is injected into the water extraction pipe 42 and the porous water collecting pipe 43 for sealing.

[0027] The above has described the present invention in detail in combination with the embodiments, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. Narrow groove pipeline installation and backfill structure system, including installation positioning brackets, cast-in-place foundations, drainage systems, and backfill structure layers, characterized in that, The cast-in-place foundation is arranged below the installation positioning bracket. The installation positioning bracket includes an arc-shaped support plate (21), a bearing plate (24), and support screws (26). The support screws (26) are arranged at the four corners of the bearing plate (24). The support screws (26) pass through the cast-in-place foundation and are inserted into the soil body at the bottom (11) of the pipe trench (1). The bearing plate (24) is supported on the cast-in-place foundation. The arc-shaped support plate (21) is supported above the bearing plate (24). The pipe (51) is supported on the arc-shaped support plate (21). The backfill structural layer includes a compacted sand layer (52) at the lower part of the trench (1) and a clay sealing layer (54) at the upper part. The drainage system includes a water injection pipe (41), a water extraction pipe (42), and an anti-filter geotextile (44). The water extraction pipe (42) is arranged below the sand layer (53) to be compacted. Water is injected into the sand layer (53) to be compacted through the water injection pipe (41) and extracted through the water extraction pipe (42). The sand layer (53) to be compacted is compacted through the action of hydraulic compaction. The anti-filter geotextile (44) is arranged between the surfaces of the bottom (11) and the wall (12) of the trench and the backfill structural layer.

2. The narrow groove pipeline installation and backfilling structure system according to claim 1, characterized in that, Longitudinal and transverse support ribs (22) are provided below the arc-shaped support plate (21); a rubber cushion layer (23) is provided above the arc-shaped support plate (21).

3. The narrow groove pipeline installation and backfilling structure system according to claim 1, characterized in that, The cast-in-place foundation is composed of a steel mesh (31) and cast-in-place concrete (32).

4. The narrow groove pipeline installation and backfilling structure system according to claim 1, characterized in that Adjusting nuts (27) are provided on the support screws (26), and through holes (25) are provided on the bearing plate (24).

5. The narrow groove pipeline installation and backfilling structure system according to claim 1, characterized in that, A perforated water collecting pipe (43) is provided below the water extraction pipe (42), and the perforated water collecting pipe (43) is wrapped with an anti-filter geotextile (44).

6. The narrow groove pipeline installation and backfilling structure system according to claim 1, characterized in that Cement mortar (45) is injected into the water extraction pipe (42) and the perforated water collecting pipe (43).

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