Soil retaining structure for existing pipeline to penetrate through foundation pit support and construction method of soil retaining structure

Abstract

The invention discloses a soil retaining structure for an existing pipeline penetrating through a foundation pit support and a construction method thereof.The soil retaining structure comprises a mother board, the mother board comprises a plurality of unit boards arranged side by side, flanges are formed on the two opposite sides of each unit board, and the flanges of every two adjacent unit boards are connected together through a connecting line board; a socket through groove is defined by the flanges of every two adjacent unit plate blocks and the connecting wire plate, and first reinforcing plates are connected between the two flanges of the unit plate blocks and the unit plate blocks. One end of the daughter board is attached to the back faces of the multiple unit boards of the mother board, multiple rib boards are formed on the daughter board, one ends of the multiple rib boards are arranged in the multiple socket through grooves in the mother board in a sliding mode respectively, and a second reinforcing board is connected between the other ends of the multiple rib boards and the side, facing the mother board, of the daughter board; and the dowel bar is connected to the first reinforcing plate and the second reinforcing plate. The problems that when an existing pipeline transversely penetrates through a foundation pit, soil around the existing pipeline cannot be supported, and collapse of the surrounding soil and breakage of the pipeline are easily caused are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a retaining structure for existing pipelines penetrating through a foundation pit support and a construction method thereof. BACKGROUND

[0002] In the process of existing city municipal road reconstruction, various existing pipelines such as gas pipelines, heat pipelines, power cables, communication pipelines and intelligent pipelines are encountered in the process of foundation pit excavation. In the process of city municipal road reconstruction, steel sheet piles are usually used for foundation pit support. When the existing pipelines cross the foundation pit, the steel sheet piles must be disconnected at the position of the existing pipelines to prevent the existing pipelines from being damaged, which results in the fact that the surrounding soil of the existing pipelines cannot be supported, and the surrounding soil collapses and the pipelines are broken. Therefore, the support of the surrounding soil of the existing pipelines is particularly important in the process of city municipal road reconstruction. SUMMARY

[0003] In order to overcome the defects of the prior art, the present application provides a retaining structure for existing pipelines penetrating through a foundation pit support and a construction method thereof, so as to solve the problem that the surrounding soil of the existing pipelines cannot be supported when the existing pipelines cross the foundation pit, which easily causes the surrounding soil to collapse and the pipelines to be broken.

[0004] In order to achieve the above-mentioned purpose, a retaining structure for existing pipelines penetrating through a foundation pit support is provided, which comprises:

[0005] A mother plate comprises a plurality of unit plate blocks arranged side by side, the unit plate blocks have a front surface and a back surface, opposite sides of the unit plate blocks form flanges, the flanges of adjacent two unit plate blocks are connected together through a connecting line plate, a socket slot is formed between the flanges of adjacent two unit plate blocks and the front surface of the connecting line plate, and first reinforcing plates are connected between the flanges of the unit plate blocks and the unit plate blocks;

[0006] A daughter plate is attached to the back surfaces of the plurality of unit plate blocks of the mother plate at one end, a plurality of rib plates are formed on the daughter plate, one end of the plurality of rib plates is respectively slidably arranged in the plurality of socket slots on the mother plate, and second reinforcing plates are connected between the other end of the plurality of rib plates and the side of the daughter plate facing the mother plate;

[0007] A force transmission rod is connected to the first reinforcing plates and the second reinforcing plates, and the other end of the daughter plate and the end of the mother plate away from the daughter plate are inserted between the foundation pit support and the soil outside the foundation pit.

[0008] Further, the width of the daughter plate is adapted to the width of the mother plate.

[0009] Furthermore, a notch is formed on one end of the flange away from the sub-plate and one end of the rib plate away from the mother plate respectively, and the fracture of the foundation pit support is inserted into the notch.

[0010] Furthermore, the ribs are arranged along the length direction of the sub-plate, and a plurality of the ribs are arranged at intervals along the width direction of the sub-plate.

[0011] The present invention provides a construction method for a retaining structure where an existing pipeline passes through a foundation pit support, comprising the following steps:

[0012] Based on the length of the fracture where the existing pipeline passes through the foundation pit support, adjust the length of one end of the rib of the sub-plate slidingly arranged in the socket groove on the mother plate so that the distance from the other end of the rib to the flange of the mother plate away from the end of the sub-plate is greater than the length of the fracture;

[0013] Connecting the force transmission rod to the first reinforcement plate and the second reinforcement plate to fix the length of the retaining structure where the existing pipeline passes through the foundation pit support;

[0014] The retaining structure where the existing pipeline passes through the foundation pit support is set at the fracture, and the other end of the sub-plate and the end of the mother plate away from the sub-plate are inserted between the foundation pit support and the soil outside the foundation pit to close the fracture above and below the existing pipeline.

[0015] The beneficial effect of the present invention is that the layered support construction of the retaining structure at the support point of the existing pipeline through the foundation pit can well protect the safety of the foundation pit around the existing pipeline, effectively prevent the collapse of the soil around the existing pipeline, and ensure that the existing pipeline is not damaged. At the same time, the retaining structure at the support point of the existing pipeline through the foundation pit of the present invention can be quickly assembled and used on site, meeting the requirements of green, low-carbon and environmentally friendly construction. The aluminum alloy has the characteristics of light weight and high strength, which greatly reduces the risk of displacement, deformation and collapse of the foundation pit around the existing pipeline, and improves the safety and stability of the foundation pit around the existing pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0017] Figure 1 This is a structural schematic diagram of an existing pipeline passing through a retaining structure at a foundation pit support according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 Cross-sectional view at AA in.

[0019] Figure 3 for Figure 1 Cross-sectional view at BB in.

[0020] Figure 4 is a sectional view at C-C in Figure 1

[0021] Figure 5 is a structural schematic diagram of a mother plate of an embodiment of the present application.

[0022] Figure 6 is a structural schematic diagram of a daughter plate of an embodiment of the present application.

[0023] Figure 7 is a structural schematic diagram of a fracture of a foundation pit support of an embodiment of the present application.

[0024] Figure 8 is a use state schematic diagram of a retaining structure of a foundation pit support where an existing pipeline penetrates of an embodiment of the present application.

[0025] Figure 9 is a local enlarged structural schematic diagram of a use state of a retaining structure of a foundation pit support where an existing pipeline penetrates of an embodiment of the present application.

[0026] Reference signs:

[0027] Mother plate 1, unit plate 11, flange 12, connecting line plate 13, first reinforcing plate 14, notch a;

[0028] Daughter plate 2, rib plate 21, second reinforcing plate 22;

[0029] Force transmission rod 3;

[0030] Foundation pit support 4, fracture 40;

[0031] Soil body 5;

[0032] Existing pipeline 6. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0034] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0035] Referring to Figures 1 to 9 , the present application provides a retaining structure of a foundation pit support where an existing pipeline penetrates, comprising: a mother plate 1, a daughter plate 2, and a force transmission rod 3.

[0036] ​In the present embodiment, the mother plate 1 comprises a plurality of unit plate blocks 11. The plurality of unit plate blocks 11 are arranged side by side. The plurality of unit plate blocks 11 are spaced apart.

[0037] The unit plate block is in the shape of a long strip or a rectangle. The unit plate block has two ends opposite in the length direction thereof. The unit plate block has two sides opposite in the width direction thereof. The unit plate block 11 has a front face and a back face. In the present embodiment, as shown in Figures 7 to 9 the back face of the unit plate block is arranged to face the soil mass outside the foundation pit support.

[0038] The two opposite sides of the unit plate block 11 form flanges 12. The flanges 12 of two adjacent unit plate blocks 11 are connected together by a connecting web plate 13. In the present embodiment, the connecting web plate is connected to the side of the flange away from the unit plate block. The flanges 12 of two adjacent unit plate blocks 11 and the front face of the connecting web plate 13 enclose a socket channel. The two flanges 12 of the unit plate block 11 and the unit plate block 11 are connected by a first reinforcing plate 14.

[0039] The sub plate 2 is in the shape of a long strip or a rectangle. The sub plate has two ends opposite in the length direction thereof. One end of the sub plate 2 (i.e. the plate face of the sub plate) is attached to the back face of the plurality of unit plate blocks 11 of the mother plate 1. The sub plate 2 is formed with a plurality of rib plates 21. One end of the plurality of rib plates 21 is respectively slidably arranged in the plurality of socket channels on the mother plate 1. The other end of the plurality of rib plates 21 and the side of the sub plate 2 facing the mother plate 1 are connected by a second reinforcing plate 22.

[0040] The dowel bar 3 is connected to the first reinforcing plate 14 and the second reinforcing plate 22. The other end of the sub plate 2 and the end of the mother plate 1 away from the sub plate 2 are inserted between the foundation pit support 4 and the soil mass 5 outside the foundation pit.

[0041] In the present embodiment, the first reinforcing plate and the second reinforcing plate are respectively provided with through holes. The dowel bar is fixedly arranged in the through holes of the first reinforcing plate and the second reinforcing plate.

[0042] In the present embodiment, the width of the sub plate 2 is adapted to the width of the mother plate 1. The width of the sub plate is slightly greater than the sum of the widths of the plurality of unit plate blocks.

[0043] In combination Figure 5 and Figure 6 as shown, the end of the flange 12 away from the sub plate 2 and the end of the rib plate 21 away from the mother plate 1 are respectively formed with notches a. Referring to Figure 8 as shown, the break 40 of the foundation pit support 4 is inserted in the notches a.

[0044] Continuing to refer to Figure 6 as shown, the rib plates 21 are arranged along the length direction of the sub plate 2. The plurality of rib plates 21 are spaced apart along the width direction of the sub plate 2.

[0045] In the embodiment, the mother plate and the daughter plate are respectively prepared by using an aluminum alloy plate. According to the width of the fracture of the existing pipeline penetrating the foundation pit support, the length module of the mother plate and the daughter plate can be 1000 mm, 1500 mm or 2000 mm; the width module of the mother plate and the daughter plate can be 300 mm or 600 mm. The overall thickness of the mother plate and the daughter plate is 100 mm. The force transmission rod is an aluminum alloy rod, the outer diameter of which is 60 mm, the wall thickness of which is 5 mm, and the length module of which can be 1200 mm, 1500 mm or 1800 mm.

[0046] When the soil retaining structure combination of the existing pipeline penetrating the foundation pit support is completed, the force transmission rod can be transversely stretched and contracted, the aluminum alloy mother-daughter plate with a corresponding module is selected, and the fracture of the foundation pit support with different widths is adapted, so that the application range is greatly increased, and the material turnover is more convenient.

[0047] The flange of the mother plate and one end of the rib plate of the daughter plate are notched, that is, the width of the flange and the rib plate changes from 100 mm to 50 mm. In the embodiment, the foundation pit support is a Larsen steel sheet pile. By changing the width of the flange and the rib plate, the steel sheet pile can be more easily inserted into the soil on the back side of the steel sheet pile, and the use is more convenient.

[0048] The application provides a construction method of a soil retaining structure of an existing pipeline penetrating a foundation pit support, which comprises the following steps:

[0049] S1, based on the length of the fracture 40 of the existing pipeline 6 penetrating the foundation pit support 4, the length of one end of the rib plate 21 of the daughter plate 2 slidingly arranged in the socket through slot of the mother plate 1 is adjusted, so that the distance from the other end of the rib plate 21 to the end of the flange 12 of the mother plate 1 away from the daughter plate 2 is greater than the length of the fracture 40.

[0050] S2, the force transmission rod 3 is connected to the first reinforcing plate 14 and the second reinforcing plate 22 to fix the length of the soil retaining structure of the existing pipeline 6 penetrating the foundation pit support 4.

[0051] S3, the soil retaining structure of the existing pipeline 6 penetrating the foundation pit support 4 is arranged at the fracture 40, and the other end of the daughter plate 2 and the end of the mother plate 1 away from the daughter plate 2 are inserted between the foundation pit support 4 and the soil 5 outside the foundation pit to close the fracture 40 above and below the existing pipeline 6.

[0052] The construction process of the soil retaining structure of the existing pipeline penetrating the foundation pit support in the application is as follows:

[0053] Peripheral pipeline exploration and excavation → steel sheet pile support → earthwork layering excavation → existing pipeline peripheral soil layering support.

[0054] 1, peripheral pipeline exploration and excavation:

[0055] Before the rain and sewage pipe reconstruction construction of the urban municipal road, the surrounding existing pipelines need to be explored and dug to determine the position of the surrounding existing pipelines and ensure that the surrounding existing pipelines are not damaged during the site support and earthwork excavation process.

[0056] 2. Steel sheet pile support:

[0057] To ensure the safety of the foundation pit, the steel sheet pile support needs to be provided for the foundation pit before the trench excavation, the steel sheet pile support needs to be disconnected within 1m-2m of the existing pipeline according to the importance of the existing pipeline and the protection requirement, and the safety of the existing pipeline is ensured.

[0058] 3. Earthwork layering excavation:

[0059] To ensure the safety of the foundation pit, the earthwork needs to be excavated layer by layer, the excavation depth of each layer needs to be excavated according to the layering support design requirement, the artificial excavation is adopted at the surrounding soil body part of the existing pipeline to prevent the existing pipeline from being damaged, and the layering excavation height of the surrounding soil body of the existing pipeline is determined according to the width of the aluminum alloy sub-plate.

[0060] 4. Layering support of the surrounding soil body of the existing pipeline:

[0061] After the surrounding soil body of the existing pipeline is excavated layer by layer according to the width of the sub-plate, one layer is supported by the retaining structure of the existing pipeline penetrating the foundation pit support of the application every time one layer is excavated, the surrounding soil body of the existing pipeline is ensured not to collapse, the support is continued downward when the support reaches the position of the existing pipeline, and the support is continued until the bottom of the foundation pit is supported.

[0062] Through the above construction method, the layering support construction of the retaining structure of the existing pipeline penetrating the foundation pit support of the application can well protect the safety of the surrounding foundation pit of the existing pipeline, effectively prevent the collapse of the surrounding soil body of the existing pipeline, and ensure that the existing pipeline is not damaged. Meanwhile, the retaining structure of the existing pipeline penetrating the foundation pit support of the application can be quickly assembled and used on site, meets the construction requirements of green low-carbon environmental protection, has the characteristics of light weight and high strength, greatly reduces the risk of displacement deformation and collapse of the surrounding foundation pit of the existing pipeline, and improves the safety and stability of the surrounding foundation pit of the existing pipeline.

[0063] The above description is only the preferred embodiment of the application and the explanation of the applied technical principles. It should be understood by those skilled in the art that the scope of the application involved in the application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the application (but not limited to) having similar functions to form a technical solution.

Claims

1. A retaining structure where an existing pipeline passes through a foundation pit support, characterized in that: include: A motherboard, comprising a plurality of unit panels arranged side by side, each unit panel having a front face and a back face, with flanges formed on opposite sides of the unit panels, the flanges of two adjacent unit panels being connected together by a connecting wire plate, the flanges of the two adjacent unit panels and the front face of the connecting wire plate enclosing a socket groove, and a first reinforcing plate being connected between the two flanges of the unit panels and the unit panels; a daughter plate, one end of which is attached to the back of the plurality of unit plates of the mother plate, the daughter plate being formed with a plurality of ribs, one end of each of which is slidably disposed in a plurality of socket grooves on the mother plate, and a second reinforcing plate being connected between the other end of each of the ribs and a side of the daughter plate facing the mother plate; A force transmission rod is connected to the first reinforcement plate and the second reinforcement plate. The other end of the sub-plate and the end of the mother plate away from the sub-plate are inserted between the foundation pit support and the soil outside the foundation pit.

2. The retaining structure for supporting a foundation pit where an existing pipeline passes through according to claim 1 is characterized in that: The width of the daughter board is adapted to the width of the mother board.

3. The retaining structure for supporting a foundation pit where an existing pipeline passes through according to claim 1 is characterized in that: One end of the flange away from the sub-plate and one end of the rib plate away from the mother plate are respectively formed with notches, and the fracture of the foundation pit support is inserted into the notches.

4. The retaining structure for supporting a foundation pit where an existing pipeline passes through according to claim 1 is characterized in that: The ribs are arranged along the length direction of the sub-plate, and a plurality of the ribs are arranged at intervals along the width direction of the sub-plate.

5. A construction method for a retaining structure where an existing pipeline passes through a foundation pit support as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Based on the length of the fracture where the existing pipeline passes through the foundation pit support, adjust the length of one end of the rib of the sub-plate slidingly arranged in the socket groove on the mother plate so that the distance from the other end of the rib to the flange of the mother plate away from the end of the sub-plate is greater than the length of the fracture; Connecting the force transmission rod to the first reinforcement plate and the second reinforcement plate to fix the length of the retaining structure where the existing pipeline passes through the foundation pit support; The retaining structure where the existing pipeline passes through the foundation pit support is set at the fracture, and the other end of the sub-plate and the end of the mother plate away from the sub-plate are inserted between the foundation pit support and the soil outside the foundation pit to close the fracture above and below the existing pipeline.

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