Anti-slope retaining device and construction method for pipeline installation under concrete pavement

Abstract

A soil retaining device and construction method for preventing slope collapse for pipe installation under a concrete pavement, comprising fixed piles and retaining plate assemblies. A row of retaining plate assemblies arranged in sequence along the length direction of the groove are provided on each side of a groove opened under the concrete pavement. Fixed piles arranged at intervals along the length direction of the groove are provided behind the retaining plate assemblies. The top of the fixed piles passes upward through the pavement through-holes on the concrete pavement. The retaining plate assemblies and the fixed piles are connected to each other via connectors. The construction method is to dig trenches in layers and install the retaining plate assemblies in layers in groups. The advantages of the present invention are: avoiding the occurrence of soil collapse on both sides during the excavation of soil for pipe installation under the concrete pavement above the groundwater level. The structure is simple and the construction is convenient.

Description

Technical Field

[0001] The invention relates to an anti-slope retaining device for pipeline installation under a concrete pavement and a construction method, belonging to the technical field of pipeline installation engineering of the civil engineering technology category. Background Art

[0002] For pipeline installation, the maximum height difference of the slope is generally less than 0.2%, the maximum excavation depth is no more than 4m, and a maintenance well (sedimentation tank) is set every 1-2km. For pipeline trench excavation, the traditional method is to slope the two sides according to the practice of small-scale canal projects for water conservancy construction, so that the cross-section of the pipeline trench that meets the design requirements after excavation is trapezoidal. The amount of earth excavation is large, and the damage to the existing concrete pavement and various pipelines is greater. If the traditional method is used for pipeline installation, it will be too destructive to the existing complete supporting facilities (including roads, communications, water supply and thermal gas pipelines), and it is not suitable for use. Summary of the invention

[0003] The invention provides an anti-slope-collapse retaining device and a construction method for pipeline installation under a concrete pavement, so as to solve the technical problem in the prior art that, under the premise of vertical layered excavation without slope relief, the side slopes of a sewage pipeline trench (clay and sandy soil layers except a pebble soil layer) collapse, causing the project progress to be interrupted and the work to be stopped.

[0004] The technical solution of the present invention is: an anti-slope retaining device for installing pipelines under a concrete pavement, characterized in that it includes: fixed piles and retaining plate assemblies, a row of retaining plate assemblies arranged in sequence along the length direction of the groove are provided on each side of a groove opened under the concrete pavement, fixed piles arranged at intervals along the length direction of the groove are provided behind the retaining plate assemblies, and one of the fixed piles is provided behind the two vertical sides of the retaining plate assembly corresponding to each side; the top of the fixed pile passes through the pavement through hole on the concrete pavement upward, and each vertical side of the retaining plate assembly is connected to a corresponding one of the fixed piles through a connecting piece, and the connecting piece can slide up and down on the fixed pile.

[0005] A construction method using the anti-slope retaining device for installing pipelines under concrete pavement is characterized by comprising the following steps:

[0006] (1) Drilling openings and road surface through holes: First, drill an opening in the concrete road surface, and use a water drill to symmetrically drill two rows of road surface through holes on both sides of the opening; the distance between two through holes corresponding to a set of retaining plate components is 1500-2500 mm; the distance between two adjacent through holes is enough to allow the U-shaped lock to pass through;

[0007] (2) Driving fixed piles: Use pile driving equipment to statically press a fixed pile into each road surface through hole from top to bottom. The bottom end of the fixed pile should penetrate the bottom of the groove by more than 1500mm.

[0008] (3) Digging the first trench: After removing the concrete debris in the crushing area, use an excavator to dig the first layer of soil in the opening from the starting point of the construction section to form the first trench;

[0009] (4) Install the bottom retaining plate assembly: press a bottom retaining plate assembly into both sides of the excavated first layer trench so that a bottom cross rib below it is basically flush with the bottom surface of the first layer trench; use U-shaped lock buckles to lock each bottom pile with a corresponding fixed pile;

[0010] (5) Digging the second trench and pressing down the bottom retaining plate assembly: Use an excavator to dig down the bottom of the first trench to form a second trench, and then statically press down the bottom retaining plate assemblies installed on both sides so that a bottom cross rib below is basically flush with the bottom surface of the second trench; during the pressing process, the installed U-shaped lock slides downward on the fixed pile as the bottom retaining plate assembly is pressed in.

[0011] (6) Digging the third trench and continuing to press down the bottom retaining plate assembly: Repeat the previous step, digging the third trench and continuing to press down the bottom retaining plate assembly, and the installed U-shaped lock slides downward on the fixed pile as the bottom retaining plate assembly is pressed in;

[0012] (7) Install the upper retaining plate assembly: insert the two plug connectors at the lower end of the upper retaining plate assembly into the holes at the top of the bottom piles of the bottom retaining plate assembly; and use the U-shaped lock to lock the two vertical sides of the upper retaining plate assembly with the corresponding fixed piles; if the designed depth has not been reached, dig multiple layers of trenches. For each layer of trench excavation, press the upper retaining plate assembly together with the bottom retaining plate assembly below to the depth of one layer of trench, install another upper retaining plate assembly on top of the installed upper retaining plate assembly, and lock it with the corresponding fixed piles with the U-shaped lock until the trench reaches the designed depth.

[0013] (8) Repeat the above steps to install multiple sets of retaining plate assemblies one by one;

[0014] (9) Installation of pipelines and removal of retaining wall assemblies: Pipes are placed at the bottom of the trenches of the completed retaining wall assemblies. Then, when backfilling the third layer of soil, the U-shaped lock is simultaneously unlocked. First, the upper retaining wall assembly at the top is removed, and then the lower retaining wall assembly is pulled out. Then, the soil is backfilled and compacted layer by layer. Repeat the above process until all pipelines are installed and all retaining wall assemblies are removed. Finally, the trench is completely filled and compacted to complete the laying of the pipeline.

[0015] The advantages of the present invention are: avoiding the occurrence of soil collapse on both sides during the excavation of soil for pipe installation under the concrete pavement above the groundwater level, so that the project that has been forced to stop can be resumed in time. The sewage pipe is placed on the design elevation according to the design requirements, and after it is in place, the soil is backfilled and compacted in layers in time to restore the concrete pavement and successfully complete the installation of the pipe. The structure is simple and the construction is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the anti-slope collapse retaining device for pipeline installation under a concrete pavement after installation of the present invention;

[0017] Figure 2 yes Figure 1 AA section view;

[0018] Figure 3 yes Figure 1 BB cross-sectional view;

[0019] Figure 4 yes Figure 1 CC section view;

[0020] Figure 5 It is a structural schematic diagram of an embodiment of a bottom retaining plate assembly of the present invention;

[0021] Figure 6 It is a structural schematic diagram of an upper retaining plate assembly embodiment of the present invention;

[0022] Figure 7 It is a schematic diagram of the exploded structure of a bottom retaining plate assembly and two upper retaining plate assemblies of the present invention;

[0023] Figure 8 It is a structural schematic diagram of another embodiment of a bottom retaining plate assembly of the present invention;

[0024] Fig. 9 It is a structural schematic diagram of another embodiment of an upper earth retaining plate assembly of the present invention.

[0025] Explanation of the reference numerals in the accompanying drawings: 1. Concrete pavement; 2. (Concrete pavement) opening; 3. Pavement through hole; 4. Fixed piles; 5. Bottom retaining plate assembly; 51. Bottom transverse ribs; 52. Bottom piles; 53. Bottom baffle; 6. Upper retaining plate assembly; 61. Upper transverse ribs; 62. Vertical ribs, 63. Upper baffle; 64. Plug connector; 65. Locking hole; 7. Bending and shear reinforcement ribs; 8. Soil; 9. Pipeline; 10. Groove; 11. U-shaped lock; 12. Design elevation of groove bottom; 13. Groundwater level. DETAILED DESCRIPTION

[0026] See also Figure 1-Figure 9 The present invention discloses an anti-slope retaining device for installing pipelines under a concrete pavement, comprising: a fixed pile 4 and a retaining plate assembly. A row of retaining plate assemblies arranged in sequence along the length direction of the groove 10 are respectively arranged on both sides of a groove 10 opened under the concrete pavement 1, and fixed piles 4 arranged at intervals along the length direction of the groove 10 are arranged behind the retaining plate assembly. One of the fixed piles 4 is respectively arranged behind the two vertical sides of the retaining plate assembly corresponding to each side; the top of the fixed pile 4 passes through the pavement through hole 3 on the concrete pavement 1 upward, and each vertical side of the retaining plate assembly is connected to a corresponding fixed pile 4 through a connecting piece, and the connecting piece can slide up and down on the fixed pile 4.

[0027] The retaining plate assembly comprises a bottom retaining plate assembly 5 and an upper retaining plate assembly 6. At least one layer of upper retaining plate assembly 6 is connected to the top of the bottom retaining plate assembly 5.

[0028] The connecting piece is a U-shaped lock 11.

[0029] See also Figure 5 The bottom retaining plate assembly 5 includes two vertical tubular bottom piles 52, at the bottom end of which a tip 54 is provided and inserted into the soil 8 below the bottom surface of the groove 10; two horizontal bottom cross ribs 51 are connected between the upper parts of the two bottom piles 52, and a bottom retaining plate 53 is welded in a rectangular frame formed by the two bottom cross ribs 51 and the two bottom piles 52.

[0030] At least one bottom locking hole 55 can be provided on each side of the bottom baffle 53 (see Figure 8 ), used to pass through the U-shaped lock buckle 11 and fit together with the fixing pile 4.

[0031] See also Figure 6 The upper retaining plate assembly 6 includes an upper transverse rib 61, a vertical rib 62, an upper baffle 63 and a plug connector 64. Two horizontally arranged upper transverse ribs 61 and the vertical ribs 62 at both ends are connected to each other to form a rectangular frame, and the upper baffle 63 is welded in the rectangular frame; a plug connector 64 for inserting into the top hole of the bottom pile 52 is provided at the bottom end of each of the two vertical ribs 62; and one (or two) locking holes 65 are provided on both sides of the upper baffle 63.

[0032] At least one upper locking hole 65 may be provided on each side of the upper baffle 63 (see Fig. 9 ), used to pass through the U-shaped lock buckle 11 and fit together with the fixing pile 4.

[0033] The U-shaped lock 11 has two installation methods:

[0034] One installation method is Figure 1-Figure 4As shown, the roots of the two plug connectors 64 of the two adjacent upper retaining plate assemblies 6 are inserted into each other with a corresponding fixing pile 4; and a bottom pile 52 of the bottom retaining plate assembly 5 is inserted into each other with a corresponding fixing pile 4 using a U-shaped lock buckle 11.

[0035] Another installation method of the U-shaped lock buckle 11 is to pass the U-shaped lock buckle 11 through the upper locking hole 65 on the upper earth retaining plate assembly 6 or through the bottom locking hole 55 on the bottom earth retaining plate assembly 5, and each is inserted into the corresponding fixing pile 4.

[0036] The fixed pile 4 is made of a galvanized hollow water pipe with an outer diameter of 60 to 80 mm. The upper end of the fixed pile 4 protrudes 200 to 300 mm above the concrete pavement 1. The lower part of the fixed pile 4 is inserted into the soil 8. On the pipe wall of the lower part of the fixed pile 4 (from the tip 54 upward) 300 mm, a circle of multiple small holes with a size of about 3 mm are set every 100 to 200 mm. A rubber film sleeve is put on the outer side of the part with the small holes and tightened with iron wire, and a needle hole is provided on the rubber film sleeve. Tighten with iron wire. If it is difficult to press the pile statically, water can be injected into the hollow water pipe of the fixed pile 4 to make the pipe wall in a wet state to reduce the resistance of the static pile. The rubber film sleeve can prevent the small holes on the pipe wall of the fixed pile 4 from being blocked by soil during the pile pressing process.

[0037] The bottom transverse ribs 51, bottom piles 52, upper transverse ribs 61, vertical ribs 62 and plug connectors 64 are all made of round iron pipes; the bottom baffles 53 and upper baffles 63 are made of iron plates.

[0038] The length of the bottom retaining plate assembly 5 corresponds to the spacing of the fixed piles 4, the spacing between the two bottom transverse ribs 51 is 500-1000mm, and the length of the bottom piles 52 below the bottom transverse ribs 51 is 1000-1500mm; the length of the upper retaining plate assembly 6 is the same as the length of the bottom retaining plate assembly 5, and the heights of the vertical ribs 62 and the plug connector 64 are 500 and 500-1000mm respectively.

[0039] A bending and shearing resistant reinforcement rib 7 is inserted into the hollow steel pipe hole of the fixing pile 4 .

[0040] The diameter of the road surface through hole 3 is 100-200 mm, corresponding to a distance of 1500-2500 mm between two retaining plate components of a group.

[0041] The construction process of the present invention is described as follows:

[0042] (1) Drilling the opening 2 and the road surface through holes 3: First, drill the opening 2 on the concrete road surface 1, and use a water drill to drill two rows of road surface through holes 3 symmetrically on both sides of the opening 2 (with the center line of the concrete road surface opening 2 as the symmetry line, which is also the axis of the pipeline 9). The spacing between two through holes 3 corresponding to a set of retaining plate components is 1500-2500 mm; the spacing between two adjacent through holes 3 only needs to leave a space for passing through the U-shaped lock buckle 11.

[0043] (2) Driving fixed piles 4: Use pile driving equipment to statically press a fixed pile 4 into each road surface through hole 3 from top to bottom. The lower end of the fixed pile 4 is a distance (greater than 1500mm) lower than the bottom surface of the groove 10. The fixed pile 4 serves as the main fixing mechanism of the entire retaining device. The top of the fixed pile 4 is fixed by the concrete road surface 1, and the bottom is fixed by the soil 8. Finally, a bending and shear reinforcement rib 7 of the same length is inserted into the hole of the fixed pile 4 to enhance the bending stiffness of the galvanized hollow steel pipe (fixed pile 4). The bending and shear reinforcement rib 7 is made of steel bars, and its diameter is slightly smaller than the hole diameter of the fixed pile 4.

[0044] (3) Digging the first trench: After removing the concrete debris in the crushing area, use an excavator to dig the first layer of soil in opening 2 from the starting point of the construction section to form the first trench. The depth of a single trench is about 1 meter (determined by the soil quality, with the principle of no collapse).

[0045] (4) Installing the bottom retaining plate assembly 5: Press a bottom retaining plate assembly 5 into both sides of the excavated first-layer trench so that a bottom cross rib 51 below it is basically flush with the bottom surface of the first-layer trench; use U-shaped lock buckles 11 to lock each bottom pile 52 with a corresponding fixed pile 4.

[0046] (5) Digging the second trench and pressing down the bottom retaining plate assembly 5: Use an excavator to dig down the bottom of the first trench to form the second trench, and then statically press down the bottom retaining plate assembly 5 installed on both sides so that a bottom cross rib 51 below is substantially flush with the bottom surface of the second trench. During the pressing process, the U-shaped lock buckle 11 continues to slide down on the fixing pile 4.

[0047] (6) Digging a third trench and continuing to press down the bottom retaining plate assembly 5: Repeat the previous step, digging a third trench and continuing to press down the bottom retaining plate assembly 5, and the U-shaped lock 11 can slide downward on the fixed pile 4.

[0048] (7) Install the upper retaining plate assembly 6: Insert the two plug connectors 64 at the lower end of the upper retaining plate assembly 6 into the holes at the top of the bottom piles 52 of the bottom retaining plate assembly 5 (see Figure 7); and lock the root of the plug connector 64 (or through the locking hole 65) with the corresponding fixed pile 4 with the U-shaped lock buckle 11. If the designed depth has not been dug yet, dig multiple layers of trenches. Each time a layer of trench is dug, press the upper retaining plate assembly 6 together with the lower bottom retaining plate assembly 5 into a layer of depth, install another upper retaining plate assembly 6 on the upper retaining plate assembly 6 that has been installed, and lock it with the corresponding fixed pile 4 with the U-shaped lock buckle 11 until the designed depth is reached.

[0049] (8) Repeat the above steps until all retaining plate assemblies are completed.

[0050] (9) Installation of pipes 9 and removal of retaining wall assemblies: Place pipes 9 at the bottom of the trench 10 where retaining wall assemblies have been completed (reaching the designed depth and a certain length, generally the length of 2-3 sets of retaining wall assemblies), then simultaneously unlock the U-shaped lock 11 when backfilling the third layer of soil, first remove the upper retaining wall assembly 6 at the top, then pull out the lower retaining wall assembly 5, and then backfill the soil in layers and compact it in layers. The removed retaining wall assemblies are used as construction materials for the trench excavation in the previous step, and are used repeatedly and alternately to save construction materials. Repeat the above process until all pipes 9 are installed and all retaining wall assemblies are removed, and finally the trench 10 is completely filled and compacted to complete the laying of pipes 9.

Claims

1. A construction method using an anti-slope retaining device for pipeline installation under a concrete pavement, characterized in that: The following steps are involved: (1) drilling an opening (2) and a road surface through hole (3): first, drilling an opening (2) in a concrete road surface 1, and using a water drill to symmetrically drill two rows of road surface through holes (3) on both sides of the opening (2); the distance between two through holes (3) corresponding to a set of retaining plate components is 1500 to 2500 mm; the distance between two adjacent through holes (3) is sufficient to allow a U-shaped lock buckle (11) to pass through; (2) Driving a fixed pile (4): using a pile driving device to statically press a fixed pile (4) into each road surface through hole (3) from top to bottom, with the lower end of the fixed pile (4) penetrating the bottom surface of the groove (10) by a distance greater than 1500 mm; (3) Digging the first trench: After removing the concrete debris in the crushing area, use an excavator to dig the first layer of soil in the opening (2) from the starting point of the construction section to form the first trench; (4) Installing the bottom retaining plate assembly (5): Pressing a bottom retaining plate assembly (5) into both sides of the excavated first layer trench so that a bottom cross rib (51) below the bottom retaining plate assembly (5) is substantially flush with the bottom surface of the first layer trench; locking each bottom pile (52) with a corresponding fixing pile (4) using a U-shaped lock buckle (11); (5) Digging a second layer of trench and pressing down the bottom retaining plate assembly (5): using an excavator to dig down the bottom of the first layer of trench to form a second layer of trench, and then statically pressing down the bottom retaining plate assembly (5) installed on both sides so that a bottom cross rib (51) below is substantially flush with the bottom surface of the second layer of trench; during the pressing process, the installed U-shaped lock buckle (11) slides down on the fixing pile (4) as the bottom retaining plate assembly (5) is pressed in; (6) Digging the third trench and continuing to press the bottom retaining plate assembly (5) downward: Repeat the previous step, digging the third trench and continuing to press the bottom retaining plate assembly (5) downward, and the installed U-shaped lock (11) slides downward on the fixed pile (4) as the bottom retaining plate assembly (5) is pressed in; (7) Installing the upper retaining plate assembly (6): inserting the two plug connectors (64) at the lower end of the upper retaining plate assembly (6) into the holes at the top of the bottom piles (52) of the bottom retaining plate assembly (5); and locking the two vertical sides of the upper retaining plate assembly (6) with the corresponding fixed piles (4) using the U-shaped lock buckle (11); if the designed depth has not been reached, dig multiple layers of trenches, and for each additional layer of trench, press the upper retaining plate assembly (6) together with the bottom retaining plate assembly (5) below to the depth of one layer of trench, and install another upper retaining plate assembly (6) on top of the already installed upper retaining plate assembly (6), and lock it with the corresponding fixed pile (4) using the U-shaped lock buckle (11), until the trench reaches the designed depth; (8) Repeat the above steps to install multiple sets of retaining plate assemblies one by one; (9) Installation of pipelines and removal of retaining plate assemblies: Pipes are placed at the bottom of the trenches (10) of the multiple sets of retaining plate assemblies that have been completed, and then the U-shaped lock (11) is simultaneously unlocked when the third layer of soil is backfilled. The upper retaining plate assembly (6) at the top is first removed, and then the lower retaining plate assembly (5) is pulled out, and then the soil is backfilled and compacted layer by layer; the above process is repeated until all pipelines are installed and all retaining plate assemblies are removed, and finally the trenches (10) are completely filled and compacted to complete the laying of the pipelines; The anti-slope retaining device for installing pipelines under a concrete pavement comprises: a fixed pile (4) and a retaining plate assembly. A row of retaining plate assemblies arranged in sequence along the length direction of the groove (10) are respectively arranged on both sides of a groove (10) opened under the concrete pavement (1). Fixed piles (4) arranged at intervals along the length direction of the groove (10) are arranged behind the retaining plate assemblies. One fixed pile (4) is respectively arranged behind the two vertical sides of the retaining plate assembly corresponding to each side. The top of the fixed pile (4) passes upward through a pavement through hole (3) on the concrete pavement (1). Each vertical side of the retaining plate assembly is connected to a corresponding fixed pile (4) via a connecting piece. The connecting piece can slide up and down on the fixed pile (4). The retaining plate assembly comprises a bottom retaining plate assembly (5) and an upper retaining plate assembly (6), wherein the bottom retaining plate assembly (5) comprises two vertical tubular bottom piles (52), the bottom ends of the bottom piles (52) being provided with pointed ends (54) and inserted into the soil (8) below the bottom surface of the groove (10); two horizontal bottom transverse ribs (51) are connected between the upper parts of the two bottom piles (52), and a bottom retaining plate (53) is welded in a rectangular frame formed by the two bottom transverse ribs (51) and the two bottom piles (52); and at least one layer of upper retaining plate assembly (6) is connected to the top of the bottom retaining plate assembly (5); The upper earth retaining plate assembly (6) comprises an upper transverse rib (61), a vertical rib (62), an upper baffle (63) and a plug connector (64); two horizontally arranged upper transverse ribs (61) and the vertical ribs (62) at both ends are connected to each other to form a rectangular frame, and the upper baffle (63) is welded inside the rectangular frame; and a plug connector (64) for inserting into the top hole of the bottom pile (52) is respectively provided at the bottom end of the two vertical ribs (62).

2. The method according to claim 1, characterized in that Bottom locking holes (55) are respectively provided on both sides of the bottom baffle (53); and upper locking holes (65) are respectively provided on both sides of the upper baffle (63).

3. The method according to claim 1, characterized in that The bottom transverse ribs (51), bottom piles (52), upper transverse ribs (61), vertical ribs (62) and plug connectors (64) are all made of round iron pipes; the bottom baffles (53) and upper baffles (63) are made of iron plates.

4. The method according to claim 1, characterized in that The bottom retaining plate assembly (5) The distance between the two bottom cross ribs (51) is 500-1000mm, and the bottom cross rib (51) below The length of the bottom pile (52) of the lower part is 500-1500mm; the length of the upper retaining plate assembly (6) is the same as the length of the bottom retaining plate assembly (5), and the height of the vertical rib (62) and the plug connector (64) is 500-1000mm.

5. The method according to claim 1, characterized in that The connecting piece is a U-shaped lock buckle (11).

6. The method according to claim 1, characterized in that The fixing pile (4) is made of a galvanized hollow water pipe with an outer diameter of 60 to 80 mm. On the wall of the lower part of the pipe inserted into the soil (8), a plurality of small holes with a diameter of 3 mm are arranged every 100 to 200 mm. A rubber film sleeve is put on the outer side of the part with the small holes, and needle holes are arranged on the rubber film sleeve. The upper end of the fixing pile (4) protrudes 200 to 300 mm above the concrete pavement (1).

7. The method according to claim 1, characterized in that Bending and shearing resistant reinforcing ribs (7) are provided in the holes of the fixing piles (4).

8. The construction method according to claim 1, characterized in that: In the step (2), if it is difficult to press the fixed pile (4), before pressing the fixed pile (4), a plurality of small holes with a diameter of 3 mm are arranged at intervals of 100 to 200 mm on the pipe wall at the bottom of the fixed pile (4), and a rubber film sleeve is put on the outer side of the part with the small holes and tightened with iron wire, and needle holes are arranged on the rubber film sleeve; when pressing the fixed pile (4), water is injected into the hollow water pipe of the fixed pile (4) to make the pipe wall in a moist state, thereby reducing the resistance of the static pressure pile.

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