A construction method for stacking and counter-pressure above pipe jacking

Abstract

The present application discloses a method for constructing a back-pressure pile on top of a jacking pipe, which relates to the field of back-pressure operations in jacking pipe projects, and comprises the following steps: S1, inserting side support plates in a lake along the layout direction of the jacking pipes, so that the side support plates are located on both sides of the two jacking pipe jacking areas, and forming two groups of enclosures on both sides of the two jacking pipe jacking areas; S2, installing a covering film at one end of the two groups of enclosures, and pulling the covering film along the layout direction of the jacking pipes so that the covering film covers the area between the two groups of side support plates; S3, installing a water retaining plate at the end where the enclosure is in contact with the retaining wall in the lake, so that the top surface of the water retaining plate extends out of the water surface, and the outer periphery and bottom surface of the water retaining plate are in contact with the covering film; S4, pulling the water retaining plate toward the end where a gap is left between the enclosure and the retaining wall in the lake, and draining the water in the covering film, so that the covering film is in a water-free state; S5, filling the covering film with sand bags; S6, installing a top pressure plate group at the top of the two groups of enclosures to compact the sand bags. This application has the effect of preventing the loosening of the soil layer caused by pipe jacking construction.

Description

Technical Field

[0001] The invention relates to the field of counter-pressure operations in pipe jacking projects, and in particular to a method for constructing a counter-pressure construction method by stacking loads above a pipe jacking project. Background Art

[0002] When building a new sewage pipeline in the lake, the working well is first constructed using the reverse method, and then the jacking method is used to pass through the lake bottom soil layer.

[0003] When it is necessary to carry out double jacking pipe crossing construction at the bottom of the lake, due to the limitations of the construction site environment, the distance between the two jacking pipes is small. When the jacking pipes are inserted into the soil layer at the bottom of the lake, the soil layer is greatly disturbed, and the soil layer is prone to loosening. In severe cases, it may even cause the jacking pipe segment at the front end to float up, resulting in the forced interruption of the jacking pipe construction.

[0004] Based on this, the present application proposes a method for heap-loaded back-pressure construction above the jacking pipe in the lake bottom soil layer at the location of heap-loaded back-pressure jacking pipe construction. Summary of the Invention

[0005] In order to avoid loosening of the soil layer caused by pipe jacking construction, the present application provides a construction method of back pressure loading above the pipe jacking.

[0006] The present application provides a method for construction of a pipe jacking with a back-pressure heap load, which adopts the following technical solutions:

[0007] A method for back-pressure construction above a pipe jacking comprises the following steps:

[0008] S1. Insert side support plates in the lake along the direction of the jacking pipe installation, so that the side support plates are located on both sides of the two jacking pipe installation areas. Two sets of enclosures are formed on both sides of the two jacking pipe installation areas, with one end of the enclosure fitting against the retaining wall in the lake and a gap left between the other end of the enclosure and the retaining wall in the lake;

[0009] S2. Install a covering film at one end of the two sets of enclosures and pull the covering film along the layout direction of the jacking pipe so that the covering film covers the area between the two sets of side support plates;

[0010] S3. Install a water retaining plate at the end where the enclosure meets the retaining wall in the lake, so that the top surface of the water retaining plate extends out of the water surface and the outer periphery and bottom surface of the water retaining plate are in contact with the covering film;

[0011] S4. Pull the water retaining plate toward the end where there is a gap between the enclosure and the retaining wall in the lake to drain the water in the coating film, leaving the coating film free of water;

[0012] S5, filling the covering film with sand bags;

[0013] S6. Install the top pressure plate group on the top of the two groups of enclosures to compact the sand bags.

[0014] By adopting the above technical solution, before constructing a new sewage pipeline in the lake, the soil layer is first compacted by means of back-loading above the area where the pipe is to be constructed. This prevents the soil layer from loosening during the pipe jacking process, thereby preventing the frontmost pipe section from floating up, and ensuring the normal construction of the pipe jacking process.

[0015] After the covering film is pulled to cover the area between the two side support plates, the water in the area inside the covering film is discharged by moving the water baffle, which is conducive to the subsequent filling of the area inside the covering film with sandbags to ensure the effect of the back pressure of the stacking.

[0016] Preferably, the top pressure plate group includes a connecting beam connected to the enclosure and a pressure plate unit slidably connected to the connecting beam. Several pressure plate units are provided along the layout direction of the top pipe. Adjacent pressure plate units are hinged by a hinge shaft. The pressure plate unit includes two mutually hinged pressure plate units. Both ends of the hinge shaft are slidably connected to the connecting beam along the length direction of the connecting beam.

[0017] By adopting the above technical solution, when connecting the top pressure plate group, first connect the top pressure plate group as a whole to one end of the enclosure, and then pull the top pressure plate group to the other end of the enclosure, so that the top pressure plate group can be unfolded to compact the sandbags; since it is difficult to ensure that the top surface of the sandbag is completely flat, the mutually hinged pressure plate units can fit more closely with the top of the sandbag according to the direction of the top of the sandbag, which has a better compaction effect on the sandbag.

[0018] Preferably, the pressure plate unit is located inside the enclosure.

[0019] By adopting the above technical solution, when the top surface of the sandbag is lower than the top surface of the enclosure, the pressure plate unit located on the inner side of the enclosure can be flipped downward to abut against the top surface of the sandbag, ensuring the compaction effect of the sandbag.

[0020] Preferably, a drawstring is provided at the top end of the covering film along its edge, and a lug for connecting the drawstring is provided on the enclosure.

[0021] By adopting the above technical solution, the connection between the covering film and the enclosure is achieved through a drawstring, and the connection method is simple.

[0022] Preferably, the lugs are located on the outer wall of the enclosure.

[0023] By adopting the above technical solution, after the top edge of the covering film is connected to the support ear, it is ensured that the top of the covering film always extends out of the water surface and is above the water surface, so that the covering film has a better covering effect on the sandbag.

[0024] Preferably, the enclosure is provided with a pressing member for pressing the unfolded covering film.

[0025] By adopting the above technical solution, the top edge of the covering film is pressed against the enclosure, preventing the top edge of the covering film from sliding inward and separating from the enclosure under the action of the gravity of the sandbag.

[0026] Preferably, the side support plates in step S1 are arranged at intervals, and after the side support plates are inserted, fences are arranged between adjacent side support plates to connect the adjacent side support plates.

[0027] By adopting the above technical solution, the number of side support plates to be inserted is reduced, which reduces the construction difficulty. At the same time, adjacent side support plates are connected by fences to block the sides of the sandbags and prevent them from tipping over to the sides.

[0028] Preferably, an air bag is provided on the outer peripheral surface of the water baffle;

[0029] In step S3, before pulling the water baffle, the airbag is inflated to make the outer wall of the airbag fit with the inner wall of the covering film.

[0030] By adopting the above technical solution, since the shape of the covering membrane is uncertain after being placed underwater, it is difficult to ensure that the outer wall of the water retaining plate is completely in contact with the inner wall of the covering membrane; by setting up an airbag and inflating the airbag, the outer wall of the airbag is tightly fitted with the inner wall of the covering membrane, thereby improving the drainage effect when the water retaining plate moves.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. Before constructing a new sewage pipeline in the lake, the soil layer is first compacted by applying back pressure above the area where the pipe jacking is to be constructed. This prevents the soil from loosening during the pipe jacking process, thereby preventing the frontmost pipe section from floating up and ensuring the normal construction process.

[0033] 2. After the covering film is pulled to cover the area between the two side support plates, the water in the area inside the covering film is drained by moving the water retaining plate, which is convenient for the subsequent filling of the area inside the covering film with sand bags to ensure the effect of the back pressure of the heap load;

[0034] 3. When connecting the top pressure plate group, first connect the top pressure plate group as a whole to one end of the enclosure, and then pull the top pressure plate group to the other end of the enclosure to expand the top pressure plate group to compact the sandbags; since it is difficult to ensure that the top surface of the sandbag is completely flat, the hinged pressure plate units can fit more closely with the top of the sandbag according to the direction of the top of the sandbag, which has a better compaction effect on the sandbag. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram showing the positional relationship between the enclosure, the retaining wall and the water surface in the embodiment.

[0036] Figure 22 is a schematic structural diagram showing the stacking back pressure structure in the embodiment.

[0037] Figure 3 yes Figure 2 A partial enlarged schematic diagram of part A.

[0038] Figure 4 It is a partial structural schematic diagram showing the connection structure between the covering film and the side support plate in the embodiment.

[0039] Description of reference numerals:

[0040] 1. Enclosure; 11. Side support plate; 111. Support ear; 12. Fence; 121. Crossbeam; 122. Longitudinal beam; 123. Insert rod; 2. Covering film; 21. Pull rope; 3. First connecting beam; 4. Pressing plate; 5. Water retaining plate; 51. Sliding support plate; 52. Airbag; 6. Top pressure plate group; 61. Second connecting beam; 62. Pressure plate unit; 621. Pressure plate monomer; 63. Articulated shaft; 631. Sliding vertical rod. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-4 This application is described in further detail.

[0042] An embodiment of the present application discloses a method for construction by heaping back pressure above a jacking pipe, which is used to perform heaping back pressure on the area to be constructed above the jacking pipe, compacting the soil layer to avoid loosening of the soil layer during the jacking pipe construction process, thereby avoiding floating of the jacking pipe segment at the front end, and ensuring the normal construction of the jacking pipe construction process.

[0043] S1. Construction enclosure:

[0044] Side support plates 11 are inserted at intervals in the lake along the direction of the jacking pipe, so that the lower part of the side support plates 11 is inserted into the soil layer and the side support plates 11 are located on both sides of the two jacking pipe jacking areas. After the side support plates 11 are inserted, fences 12 are installed between adjacent side support plates 11 to connect the adjacent side support plates 11.

[0045] One side of the fence 12 in the length direction is in contact with the retaining wall in the lake, and a distance is left between the other side of the fence 12 in the length direction and the retaining wall in the lake.

[0046] The fence 12 includes a plurality of horizontal beams 121 distributed at vertical intervals and longitudinal beams 122 for connecting the horizontal beams 121. Two longitudinal beams 122 are symmetrically arranged on both sides of the horizontal beam 121. The longitudinal beams 122 are located above the water surface and are connected to the side support plates 11 by screws. The bottom end of the longitudinal beam 122 is provided with an insertion rod 123, which is inserted downward into the soil layer.

[0047] The side support plates 11 and the fence 12 located on the same side together constitute the enclosure 1.

[0048] S2. Install the covering film:

[0049] A covering film 2 is installed at one end of the enclosure 1 to cover the side walls of the enclosure 1 and the lake bottom soil. Lugs 111 are provided on the outer walls of the side support plates 11 at both ends of the enclosure 1, and a drawstring 21 is provided at the top outer edge of the covering film 2. To install the covering film 2, first connect the drawstring 21 at one end of the covering film 2 to the lug 111. Then, pull the covering film 2 toward the other end of the enclosure 1 until the covering film 2 covers the side walls of the enclosure 1 and the lake bottom soil. Finally, connect the drawstring 21 at the other end of the covering film 2 to the lug 111, completing the installation of the covering film 2.

[0050] To further enhance the fit between the edge of the covering film 2 and the enclosure 1 and prevent the edge of the covering film 2 from separating from the enclosure 1 due to external forces during subsequent construction, a first connecting beam 3 is provided on the outer wall of the enclosure 1, and the first connecting beam 3 is arranged along the length of the enclosure 1. An L-shaped pressing plate 4 is bolted to the first connecting beam 3, and the pressing plate 4 is arranged along the length of the first connecting beam 3. After the covering film 2 is installed, the side of the pressing plate 4 away from the first connecting beam 3 is placed over the portion of the covering film 2 located on the top surface of the side support plate 11, and the other side of the pressing plate 4 is bolted to the first connecting beam 3.

[0051] S3. Install the water retaining plate:

[0052] A water retaining plate 5 is installed at the end of the enclosure 1 that abuts the inner retaining wall of the lake, so that the side wall of the water retaining plate 5 facing away from the inner area of the covering film 2 is in contact with the inner retaining wall of the lake and the top of the water retaining plate 5 protrudes from the water surface. An air bag 52 is provided on the outer peripheral surface of the water retaining plate 5, the top of the air bag 52 protrudes from the water surface, and the inflation port of the air bag 52 is located above the water surface.

[0053] A slide groove is provided on the first connecting beam 3, and sliding support plates 51 are fixed on both sides of the top of the water retaining plate 5. The sliding support plate 51 is located on the side of the clamping plate 4 away from the enclosure 1. The end of the sliding support plate 51 away from the slide groove extends into the slide groove and is slidably connected to the slide groove.

[0054] After the water baffle 5 is installed, air is inflated into the airbag 52 so that the outer wall of the airbag 52 is tightly fitted to the inner wall of the covering film 2 .

[0055] S4. Drainage of the inner area of the coating:

[0056] The water retaining plate 5 is pulled toward the end where a gap is left between the enclosure 1 and the retaining wall in the lake to discharge the water in the coating film 2 so that the coating film 2 is free of water.

[0057] S5. Sand bag filling:

[0058] Sand bags are filled into the inner area of the covering film 2 until the top of the sand bag is located at the top position of the enclosure 1 .

[0059] S6. Sand bag compaction:

[0060] Install the top pressure plate group 6 on the top of the two groups of enclosures 1, and adjust the top pressure plate group 6 to compact the sandbags.

[0061] The top pressure plate group 6 includes a second connecting beam 61 fixedly connected to the outside of the enclosure 1 and a pressure plate unit 62 provided on the two second connecting beams 61. The second connecting beam 61 is provided parallel to and below the corresponding first connecting beam 3.

[0062] Several pressure plate units 62 are connected in sequence along the length direction of the second connecting beam 61. Any two adjacent pressure plate units 62 are hinged by a hinge shaft 63. The two ends of the hinge shaft 63 extend outward to the top of the second connecting beam 61. The two ends of the hinge shaft 63 are respectively fixed with sliding vertical rods 631, and the bottom end of the sliding vertical rod 631 is slidably connected to the second connecting beam 61.

[0063] The pressure plate unit 62 includes two mutually hinged pressure plate monomers 621, and the pressure plate monomers 621 are located on the inner side of the enclosure 1; in this embodiment, the pressure plate monomers 621 are selected to be steel plates that can compact the sandbags by their own weight.

[0064] After the top pressure plate group 6 is connected, the top pressure plate group 6 is pulled toward the other end of the enclosure 1 to unfold the top pressure plate group 6 and make the pressure plate monomer 621 fit tightly against the top of the sandbag to compact the sandbag.

[0065] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for back-pressure construction above a jacking pipe, characterized in that , including the following steps: S1, inserting side support plates (11) in the lake along the layout direction of the jacking pipe, so that the side support plates (11) are located on both sides of the two jacking pipe jacking areas, forming two sets of enclosures (1) on both sides of the two jacking pipe jacking areas, one end of the enclosure (1) is in contact with the retaining wall in the lake, and a gap is left between the other end of the enclosure (1) and the retaining wall in the lake; S2, installing a covering film (2) at one end of the two sets of enclosures (1), and pulling the covering film (2) along the layout direction of the top pipe so that the covering film (2) covers the area between the two sets of side support plates (11); S3, installing a water retaining plate (5) at one end of the enclosure (1) that is in contact with the retaining wall in the lake, so that the top surface of the water retaining plate (5) extends out of the water surface, and the outer periphery and bottom surface of the water retaining plate (5) are in contact with the coating film (2); S4, pulling the water retaining plate (5) toward the end where a gap is left between the enclosure (1) and the retaining wall in the lake, to discharge the water in the coating film (2), so that the coating film (2) is free of water; S5, filling the coating film (2) with sand bags; S6. Install the top pressure plate group (6) on the top of the two groups of enclosures (1) to compact the sand bags; An air bag (52) is provided on the outer peripheral surface of the water baffle (5); In step S3, before pulling the water retaining plate (5), the air bag (52) is inflated to make the outer wall of the air bag (52) fit the inner wall of the coating film (2).

2. The method for back-pressure construction above a pipe jacking according to claim 1, characterized in that: The top pressure plate group (6) includes a connecting beam connected to the enclosure (1) and a pressure plate unit (62) slidably connected to the connecting beam. The pressure plate units (62) are provided with a plurality of pressure plate units (62) along the layout direction of the top pipe. Adjacent pressure plate units (62) are hinged by a hinge shaft (63). The pressure plate unit (62) includes two mutually hinged pressure plate monomers (621). Both ends of the hinge shaft (63) are slidably connected to the connecting beam along the length direction of the connecting beam.

3. The method for back-pressure construction above a pipe jacking according to claim 2, characterized in that: The pressure plate unit (621) is located inside the enclosure (1).

4. The method for back-pressure construction above a pipe jacking according to claim 1, characterized in that: A drawstring (21) is provided at the top end of the covering film (2) along its edge, and a support ear (111) for connecting the drawstring (21) is provided on the enclosure (1).

5. The method for back-pressure construction above a pipe jacking according to claim 4, characterized in that: The support lug (111) is located on the outer wall of the enclosure (1).

6. The method for back-pressure construction above a pipe jacking according to claim 5, characterized in that: The enclosure (1) is provided with a pressing member for pressing the unfolded covering film (2).

7. The method for back-pressure construction above a pipe jacking according to claim 1, characterized in that: The side support plates (11) in step S1 are arranged at intervals. After the side support plates (11) are inserted and punched, fences (12) are arranged between adjacent side support plates (11) to connect the adjacent side support plates (11).

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