A grooving construction method for pipeline underpass

Abstract

The present invention discloses a grooving construction method for an underpass pipeline, wherein the construction method comprises the steps of: pipe exploration and laying out, excavation of a test pit, support erection and trench excavation, pipeline installation, support removal and trench backfilling. After the existing pipeline is properly supported and protected, trench excavation and installation of a new water diversion pipeline can be carried out, which not only ensures the absolute safety of the existing pipeline, but also greatly shortens the construction period and reduces construction costs.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline installation, in particular to a grooving construction method for an underpass pipeline. Background Art

[0002] In recent years, with the continued rise of urbanization in my country, the demand for water resources has increased. Due to geographical constraints, the imbalance between water supply and demand has become increasingly apparent. Water diversion pipeline projects are a key way to alleviate this imbalance and support sustainable development in water-scarce areas. However, water diversion pipelines are often long and involve complex underground pipelines. These existing pipelines severely squeeze the installation space available for pre-buried pipes, increasing construction complexity, costs, and duration, presenting significant challenges.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not mean that the above content is the closest prior art. Summary of the Invention

[0004] The object of the present invention is to provide a grooving construction method for an underpass pipe, so as to solve the problem of construction difficulties at the intersection of the existing pipe and the pre-buried pipe proposed in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for grooving a pipeline underpass, comprising the following steps:

[0006] Step 1: Probe line laying:

[0007] Before construction, understand the existing pipeline's direction, burial depth, diameter, and pipe material, and then lay out and mark the existing pipeline's centerline and sidelines;

[0008] Step 2: Excavation of the test pit:

[0009] First, after clearing the surface structures and vegetation, an I-shaped trench is excavated with the intersection of the pre-buried pipeline and the existing pipeline as the center. A test pit is then dug. Once the existing pipeline is found, all relevant pipe sections are exposed, the integrity is checked, and pipe joints and weak points are marked.

[0010] Step 3: Support construction:

[0011] It includes two actions: support erection and trench excavation. The support is erected while excavation is carried out, and adjacent supports are constructed in sequence.

[0012] Step 4: Pipeline installation: Use the lifting and moving method to install the embedded pipeline. The specific steps are as follows:

[0013] a: Fill the bottom of the trench with fine sand;

[0014] b: Lift the existing pipeline to the bottom of the trench from one side of the intersection;

[0015] c: Use a hydraulic device to drag the existing pipeline to the designated location and connect it with the pre-buried pipeline in the previous section;

[0016] Step 5: Support removal and trench backfilling:

[0017] First, backfill the trenches between different supports until they reach the bottom of the existing intersecting pipelines and compact them, then remove the supports. Adjacent supports should be removed in sequence.

[0018] Step 6: Pipeline deformation detection:

[0019] The main inspection content is the settlement and displacement of the soil at the existing pipeline, which requires continuous inspection;

[0020] Step 7: Data archiving and filing:

[0021] During the construction process, construction logs and photo information should be recorded, and monitoring videos should be retained. After the construction is completed, relevant information such as the pipeline burial depth and intersection coordinates should be recorded to form an archive.

[0022] Preferably, in step three, the support installation includes large-angle cross support and small-angle cross support, and different support installation methods are used when the intersection angle between the pre-buried pipeline and the existing pipeline is large / small.

[0023] Preferably, the large-angle cross support adopts pipe bottom support, and the support is set on both sides of the groove. Each group of large-angle cross supports includes a support base arranged along the direction of the existing pipeline and on both sides of the groove. A steel pipe bracket with a retractable height adjustment is arranged on the support base, and a lifting device is arranged on the upper end of the steel pipe bracket for placing the existing pipeline. By adjusting the height of the steel pipe bracket, the existing pipeline can fall into the arc groove of the lifting device.

[0024] Preferably, the small-angle cross support adopts the pipe bottom and two-side support method, and the support is set on both sides of the groove. Each group of small-angle support includes a support base set along the existing pipeline and on both sides of the groove at the intersection. A retractable height-adjustable steel pipe bracket is arranged on the support base. The two groups of steel pipe brackets are connected by an I-beam, and a lifting device is arranged on the upper end of the I-beam for placing the existing pipeline.

[0025] Preferably, a flexible pad is provided on the lifting device.

[0026] Preferably, when the supporting foundation is placed, a pedestal for placing the supporting foundation is opened in the groove.

[0027] Preferably, during the trench excavation process, the side slope of the trench is reinforced by grouting with steel pipes.

[0028] Preferably, the lifting device and the steel pipe support are provided with height adjustment parts, and the height adjustment parts include two groups of symmetrically arranged lifting cylinders, the telescopic ends of the lifting cylinders are connected to the bottom of the lifting device, and the steel pipe support is provided with a placement plate for placing the lifting cylinders.

[0029] Preferably, the lifting device includes a lifting trough plate, which is arranged at the upper end of the steel pipe bracket and the lower end of which is connected to the lifting cylinder. Two groups of arc-shaped lifting seats are symmetrically arranged on the lifting trough plate, and the arc-shaped lifting seats and one side of the lifting trough plate are provided with pin shaft holes for matching use, and the pin shaft holes are provided on the pin shaft holes.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. This invention utilizes a simultaneous excavation and support installation method to ensure the stability of existing pipelines during pre-buried pipeline installation. Furthermore, the specific structural design of the support installation ensures that existing pipelines are properly supported and protected before trench excavation and installation of new water diversion pipelines. This not only ensures the absolute safety of existing pipelines but also significantly shortens construction time and reduces costs.

[0032] 2. The present invention can ensure the stability of the groove slopes by implementing steel flower pipe grouting on the slopes on both sides of the groove, thereby further improving the stability of the support installation and burial.

[0033] 3. The present invention uses steel components as the supporting structure, which can be quickly prefabricated and used, and is also convenient for later disassembly and reuse.

[0034] 4. The present invention implements different support and installation methods according to the different intersection angles between the existing pipeline and the pre-buried pipeline, so that the support and installation can provide stable support for the existing pipeline, thereby facilitating effective protection of the existing pipeline during the construction of the pre-buried pipeline.

[0035] 5. When installing the pre-buried pipeline, the present invention uses a pipe dragging method to facilitate the construction and installation of the pre-buried pipeline because the crane cannot directly lift the pre-buried pipeline to the bottom of the intersection due to the obstruction of the support and the existing pipeline at the intersection. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is the overall construction process flow chart of this embodiment;

[0037] Figure 2 This is a schematic diagram of the large-angle cross support plane layout of this embodiment;

[0038] Figure 3This is a schematic diagram of the small-angle cross support plane layout of this embodiment;

[0039] Figure 4 This is a three-dimensional structural diagram of the pipe bottom support in this embodiment;

[0040] Figure 5 This is a three-dimensional structural diagram of the two side supports of this embodiment;

[0041] Figure 6 This is a front view of the pipe bottom support of this embodiment;

[0042] Figure 7 This is a front view of the two side supports of this embodiment.

[0043] Figure numbers: 1-existing pipeline; 2-support erection; 3-trench; 4-support foundation; 41-steel plate; 42-sand and gravel foundation; 43-compacted original soil; 5-steel pipe support; 6-lifting device; 61-lifting trough plate; 62-arc-shaped lifting seat; 63-pin shaft hole; 64-pin shaft; 7-I-beam; 8-flexible pad; 9-height adjustment part; 91-lifting cylinder; 92-placement plate. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] Example 1

[0046] The present invention provides a technical solution: a grooving construction method for a pipeline underpass, characterized by comprising the following steps:

[0047] Step 1: Probe line laying:

[0048] Before construction, determine the direction, burial depth, diameter, and material of the existing pipeline 1, then lay out and mark the centerline and sidelines of the existing pipeline 1. Metal pipelines must be further detected and confirmed using a pipeline detector.

[0049] Step 2: Excavation of the test pit:

[0050] First, after clearing the surface structures and vegetation, an I-shaped trench 3 is excavated with the intersection of the pre-buried pipeline and the existing pipeline 1 as the center. After the existing pipeline 1 is found, all relevant pipe sections are excavated to expose them, and the integrity is checked and the pipe joints and weak points of the pipeline are marked.

[0051] Step 3: Support construction:

[0052] It includes two actions: support erection 2 and trench excavation. The support is erected while excavation is carried out, and adjacent supports are constructed in sequence.

[0053] Among them, the support structure 2 can be made by prefabricating steel structures, and can be directly transported and used when in use;

[0054] Step 4: Pipeline installation: Use the lifting and moving method to install the embedded pipeline. The specific steps are as follows:

[0055] a: Fill the bottom of trench 3 with fine sand;

[0056] b: Lift the existing pipe 1 to the bottom of the trench 3 from one side of the intersection;

[0057] c: Use a hydraulic device to drag the existing pipeline 1 to the designated location and connect it to the pre-buried pipeline in the previous section;

[0058] The hydraulic device is used as the power to push the pre-buried pipe. At the same time, a roller device is set in the groove 3. When the crane places the pre-buried pipe on the roller device, the hydraulic device will push the pre-buried pipe to move on the roller device, so that the pre-buried pipe moves to the bottom of the intersection and docks with the previous pipe.

[0059] Since the existing pipeline 1 and support frame 2 occupy the space above the trench 3, the lifting operation is limited. Especially when the intersection angle of the existing pipeline 1 and support frame 2 is small, the conventional method cannot be installed. Therefore, this method is adopted to avoid the above problem.

[0060] Step 5: Support removal and trench 3 backfill:

[0061] First, backfill the trenches 3 between the different supports until they reach the bottom of the existing intersecting pipeline 1 and compact it, then remove the supports. Adjacent supports should be removed in sequence.

[0062] Step 6: Pipeline deformation detection:

[0063] The main inspection content is the settlement and displacement of the soil at the existing pipeline 1, and this step requires continuous inspection;

[0064] Among them, the specific detection contents include: a: abnormal changes in deformation or deformation rate; b: deformation or deformation rate reaches or exceeds the deformation warning value; c: slope collapse, landslide or abnormality in the surrounding environment occurs.

[0065] Step 7: Data archiving and filing:

[0066] During the construction process, construction logs and photo information should be recorded, and monitoring videos should be retained. After the construction is completed, relevant information such as the pipeline burial depth and intersection coordinates should be recorded to form an archive.

[0067] Example 2

[0068] This embodiment provides two specific implementation methods of the support installation 2 and under what circumstances to use which support installation 2, please refer to Figure 2-5 The support installation 2 includes large-angle cross supports and small-angle cross supports, which are used when the intersection angle between the pre-buried pipeline and the existing pipeline 1 is large / small. Different support installation methods 2 are adopted to make the installation more stable and fast, and the construction is faster and more material-saving than the existing installation method.

[0069] Among them, the large-angle intersection means that the angle between the existing pipeline and the pre-buried pipeline is between 45 and 90 degrees, and the small-angle intersection means that the angle between the existing pipeline and the pre-buried pipeline is between 0 and 45 degrees.

[0070] like Figure 2 and 4 and Figure 6 As shown, the large-angle cross support adopts pipe bottom support, and the support frame 2 is arranged on both sides of the groove 3. Each group of large-angle cross supports includes a support base 4 arranged along the direction of the existing pipeline 1 and on both sides of the groove 3. A steel pipe bracket 5 with a retractable height adjustment is arranged on the support base 4, and a lifting device 6 is arranged on the upper end of the steel pipe bracket 5 for placing the existing pipeline 1. By adjusting the height of the steel pipe bracket 5, the existing pipeline 1 can fall into the arc groove of the lifting device 6.

[0071] like Figure 3 and Figure 5 and Figure 7 As shown, the small-angle cross support adopts the pipe bottom and two-side support method, and the support frame 2 is set on both sides of the groove 3. Each group of small-angle support frames 2 includes a support base 4 arranged along the existing pipeline 1 and on both sides of the groove 3 at the intersection. A steel pipe bracket 5 with a retractable height adjustment is arranged on the support base 4. The two groups of steel pipe brackets 5 are connected by an I-beam 7. A lifting device 6 is arranged on the upper end of the I-beam 7 for placing the existing pipeline 1. Multiple groups of small-angle cross supports will be set along the layout direction of the existing pipeline 1. The specific number is determined by the length of the groove 3 passing through the existing pipeline 1 and the spacing between adjacent support frames 2.

[0072] Among them, the lifting device 6 and the steel pipe support 5 are provided with a height adjustment part 9, and the height adjustment part 9 includes two groups of symmetrically arranged lifting cylinders 91. The telescopic ends of the lifting cylinders 91 are connected to the bottom of the lifting device 6, and the steel pipe support 5 is provided with a placement plate 92 for placing the lifting cylinders 91.

[0073] In addition, the lifting device 6 includes a lifting slot plate 61, which is arranged on the upper end of the steel pipe support 5 and connected to the lifting cylinder 91 at its lower end. Two sets of arc-shaped lifting seats 62 are symmetrically arranged on the lifting slot plate 61. The arc-shaped lifting seats 62 and one side of the lifting slot plate 61 are provided with a pin shaft hole 63 for use in conjunction with each other, and a pin shaft 64 is provided on the pin shaft hole;

[0074] When docking with the existing pipeline 1, the two sets of arc-shaped lifting seats 62 can be moved from both sides of the lifting slot plate 61 to the lower end of the existing pipeline 1 and then fixed through the pin shaft hole 63 and the pin shaft. Then, the height of the lifting slot plate 61 can be fine-tuned by adjusting the lifting cylinder 91 to make the arc-shaped lifting seat 62 dock with the existing pipeline 1. By docking with the existing pipeline 1 in this way, the height of the steel pipe support 5 can be pre-set, and then only a short distance of fine-tuning of the lifting slot plate 61 is required. This avoids large-scale adjustment of the height of the steel pipe support 5, which causes construction difficulties. At the same time, the two-stage moving design of the arc-shaped lifting seat 62 can avoid the arc-shaped lifting seat 62 from being difficult to move to the lower end of the existing pipeline 1 during fine-tuning. At the same time, by supporting on both sides, the existing pipeline 1 can be better supported, making the support more stable.

[0075] Among them, the components in the support frame 2 are all made of steel components and are fixed by welding. At the same time, the support foundation 4 includes three layers: steel plate 41, gravel foundation 42 and compacted original soil 43, which are prefabricated from top to bottom, and the steel plate end 41 and the steel pipe bracket 5 are welded and fixed.

[0076] In addition, if Figure 4 and Figure 5 As shown, a flexible pad 8 is arranged on the lifting device 6 to provide flexible protection to the surface of the existing pipeline 1 when it is installed.

[0077] When the supporting foundation 4 is placed, a pedestal for placing the supporting foundation 4 is opened in the groove 3 .

[0078] Among them, the specific setting of the foundation depends on the foundation conditions. When the supporting foundation 4 is located in the bearing layer, over-excavate 30∽50cm, replace with rubble stones, fill the gaps with medium-coarse sand, level and compact, and then lay steel plates as the foundation; when the supporting foundation 4 is located in a weak stratum, adopt the method of throwing stones to squeeze out silt, fill 30∽50cm of rubble stones in the foundation part, use a small excavation hammer to repeatedly compact and add riprap in time until there are no obvious signs of pit excavation and no obvious settlement difference around; clean up the raised soil around, fill the gaps with sand and level, and lay steel plates as the foundation.

[0079] Finally, during the excavation of the trench 3, the slope of the trench 3 is reinforced by grouting with a steel pipe to prevent the slope from collapsing or landslides causing the support frame to tilt, shift or become unstable, thereby stabilizing the support frame 2.

[0080] Among them, the specific implementation of steel flower pipe grouting adopts the following requirements:

[0081] a. Grouting material should be ordinary Portland cement of PO32.5 grade or above, with water-cement ratio W:C=0.4∽0.5:1.

[0082] b. The grouting diffusion radius is 0.6m, and the grouting holes are arranged in a triangle on both sides of the trench 3 with a hole spacing of 1.2m and a row spacing of 1.2m. The depth of the grouting holes shall not be less than the excavation depth of the trench 3.

[0083] c. The grouting pressure should be controlled between 0.3 and 0.8 MPa. During the grouting process, attention should be paid to controlling the grouting rate and pressure changes.

[0084] d. Grouting should follow the principle of gradual density in sequence. The grouting holes in a row should be divided into several sequences, and drilling and grouting should be carried out in the method of sparse first and dense later, with holes inserted in the middle.

[0085] f. When overflow of grouting hole cannot be blocked or grouting occurs in the adjacent hole, stop grouting.

[0086] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0087] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A grooving construction method for a pipeline underpass, characterized in that: The steps include: Step 1: Probe line laying: Before construction, after determining the direction, buried depth, and diameter of the existing pipeline (1), the centerline and sideline of the existing pipeline (1) are marked; Step 2: Excavation of the test pit: Taking the intersection of the pre-buried pipeline and the existing pipeline (1) as the center, an I-shaped trench (3) is excavated to conduct an exploration pit. After the existing pipeline (1) is found, all relevant pipe sections are excavated to expose the integrity and mark the pipe sections and weak parts of the pipeline; Step 3: Support construction: It includes two actions: support erection (2) and trench excavation, and implements the erection and support of the existing pipeline suspended after excavation while excavating; Step 4: Pipeline installation: Use the lifting and moving method to move the pre-buried pipeline to the position below the existing pipeline for installation; Step 5: Support removal and trench (3) backfilling: First, backfill the trenches (3) between the different supports until they reach the bottom of the existing intersecting pipeline (1) and compact it, then remove the supports. Adjacent supports should be removed in sequence. In step three, the support installation (2) includes large-angle cross support and small-angle cross support, which are used when the intersection angle between the pre-buried pipeline and the existing pipeline (1) is large / small, and different support installation (2) methods are adopted; The large-angle cross support adopts a pipe bottom support, and the support frame (2) is arranged on both sides of the groove (3). Each group of large-angle cross supports includes a support base (4) arranged along the direction of the existing pipeline (1) and on both sides of the groove (3). A steel pipe bracket (5) with a retractable height adjustment is arranged on the support base (4). A lifting device (6) is arranged on the upper end of the steel pipe bracket (5) for placing the existing pipeline (1). By adjusting the height of the steel pipe bracket (5), the existing pipeline (1) can fall into the arc groove of the lifting device (6).

2. A grooving construction method for a pipeline underpass according to claim 1, characterized in that: The small-angle cross support adopts a pipe bottom and two-side support method, and the support structure (2) is arranged on both sides of the groove (3). Each group of small-angle support structures (2) includes a support base (4) arranged along the existing pipeline (1) and on both sides of the groove (3) at the intersection. A steel pipe bracket (5) with a retractable height adjustment is arranged on the support base (4). The two groups of steel pipe brackets (5) are connected by an I-beam (7). A lifting device (6) is arranged on the upper end of the I-beam (7) for placing the existing pipeline (1).

3. A grooving construction method for an underpass according to claim 1 or 2, characterized in that: A flexible pad (8) is provided on the lifting device (6).

4. A grooving construction method for an underpass according to claim 1 or 2, characterized in that: When the supporting foundation (4) is placed, a support platform for placing the supporting foundation (4) is opened in the groove (3).

5. The method for grooving a pipeline under the pipeline according to claim 1, characterized in that: During the trench (3) excavation process, the side slope of the trench (3) is reinforced by grouting with a steel pipe.

6. A method for grooving a pipeline underpass according to claim 1 or 2, characterized in that: The lifting device (6) and the steel pipe support (5) are provided with a height adjustment member (9), and the height adjustment member (9) includes two groups of symmetrically arranged lifting cylinders (91), the telescopic ends of the lifting cylinders (91) are connected to the bottom of the lifting device (6), and the steel pipe support (5) is provided with a placement plate (92) for placing the lifting cylinders (91).

7. A method for grooving a pipeline underpass according to claim 1 or 2, characterized in that: The lifting device (6) includes a lifting slot plate (61), which is arranged at the upper end of the steel pipe bracket (5) and connected to the lifting cylinder (91) at its lower end. Two groups of arc-shaped lifting seats (62) are symmetrically arranged on the lifting slot plate (61), and a pin shaft hole (63) for use with the arc-shaped lifting seat (62) and the lifting slot plate (61) is provided on one side, and a pin shaft (64) is provided on the pin shaft hole.

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