Buoyancy pipe penetrating construction method

Abstract

The invention discloses a buoyancy pipe penetrating construction method, which is characterized in that a water source is used as a medium between an outer sleeve and an inner penetrating pipe, so that the smoothness of the construction process is ensured, and an inlet hole water stopping device and an outlet hole water stopping device are respectively arranged at two ends of the outer sleeve and are used as a sealing system of the water source. In addition, a limiting device, a limiting roller and an anti-collision roller are installed at the position of the inlet hole, the inner wall of the outer sleeve and the end of the inner penetrating pipe respectively. And finally, the inner penetrating pipe is smoothly pushed into the outer sleeve under the action of buoyancy. The problems that in a traditional roller launching method, a method for installing trundles on the outer wall of a pipeline and a pulley block propelling method, the roller structural strength is insufficient, durability is poor, and an outer anticorrosive coating of the pipeline is prone to being damaged are effectively solved, and the method is particularly suitable for large-diameter and long-distance inner penetrating pipe construction with the high requirement for finished product protection; and the method has good economical efficiency and implementation effect.

Description

Technical Field

[0001] The invention relates to the technical field of trenchless construction, and in particular to a buoyancy pipe-penetrating construction method. Background Art

[0002] At present, trenchless pipe jacking technology has been widely used in municipal pipeline engineering and other fields. However, in the process of laying pipelines, some areas with complex geological conditions are often encountered, especially when the pipeline needs to cross rivers, roads, and railways, which requires higher safety for pipeline operation. In recent years, the application of internal pipe jacking in pipeline construction has become more and more common, and it is an important means to solve the problem of pipelines crossing important buildings.

[0003] At present, in the existing internal pipe penetration engineering cases at home and abroad, traditional roller launching method, pipe outer wall caster installation method, pulley block propulsion method and other technologies are generally used. These methods are mainly suitable for projects with small pipe diameter, short internal penetration distance and low requirements for finished product protection. However, in internal pipe penetration construction involving large diameter, long distance, and high requirements for pipeline anti-corrosion finished product protection, these traditional methods often encounter problems such as insufficient support structure strength and poor durability, and are easy to cause damage to the anti-corrosion layer on the outer layer of the pipeline. Therefore, it is necessary to propose a new pipe penetration construction method to solve the above problems.

[0004] It should be understood that the above statements merely provide background technology related to the present invention and do not necessarily constitute prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a buoyancy pipe penetration construction method to overcome the problems of insufficient support structure strength and poor durability in traditional pipe penetration construction methods.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a buoyancy pipe penetration construction method, which utilizes buoyancy to penetrate the inner pipe in the middle part of the outer sleeve, and specifically comprises the following steps: S1, installing an inlet water-stopping device and an inlet limiting device at one end of the outer sleeve as an inlet, and installing an outlet water-stopping device and an outlet water-stopping wall at the other end of the outer sleeve as an outlet; S2, arranging precast concrete pads at uniform intervals along the axial direction at the bottom of the cavity inside the outer sleeve, and installing limiting rollers on the inner wall of the outer sleeve; S3, using a power system to push the end of the first section of the inner pipe into the inlet water-stopping device for a first set distance, and then making an inner pipe end water-stopping wall at the end of the inner pipe, and installing an inner pipe end anti-collision roller at the end of the inner pipe; S4, pushing the inner pipe end water-stopping wall to the inner pipe end. Water is injected between the outer sleeve and the inner pipe, and after reaching the predetermined water level line, the inner pipe continues to be connected and pushed forward normally; S5, when the inner pipe is pushed to the second set distance in front of the water-stopping device at the exit, the pushing is suspended, and the anti-collision roller at the end of the inner pipe is removed, and then the pushing is continued; S6, after the inner pipe is pushed out of the water-stopping device at the exit, the pushing is suspended, the water source between the water-stopping device at the exit and the water-stopping wall at the exit is discharged, and the water-stopping wall at the exit is removed; S7, the pushing is continued, and the inner pipe is pushed to the outside of the exit of the outer sleeve to complete the pushing of the inner pipe; S8, the water source between the inner pipe and the outer sleeve is drained, so that the inner pipe falls vertically onto the precast concrete pad; S9, the water-stopping wall at the end of the inner pipe is removed to complete the buoyancy pipe construction.

[0007] Preferably, the cave inlet water-stopping device comprises: a cave inlet flange, a cave inlet rubber water-stopping curtain, a cave inlet water-stopping baffle and a plurality of cave inlet connecting parts.

[0008] Among them, the inlet flange is an annular structure with a T-shaped cross-section, and its T-shaped longitudinal beam is installed on the inner wall of the inlet of the outer casing, and the T-shaped cross beam is connected to the inlet water stop baffle through a plurality of the inlet connecting parts; the inlet rubber water stop curtain is located in the middle part of the inlet flange and the inlet water stop baffle, and is clamped and fixed by the inlet flange and the inlet water stop baffle.

[0009] Preferably, the outer wall of the hole entrance of the outer sleeve is provided with an outer sleeve hole entrance flange in an annular shape, and the hole entrance limiting device is welded to the outer side of the outer sleeve hole entrance flange.

[0010] Preferably, the hole entrance limiting devices are respectively arranged directly above the hole entrance of the outer sleeve and on two corresponding sides in the horizontal direction.

[0011] Among them, each of the entrance limiting devices includes: a first L-shaped limiting device, a first nylon roller and a first connecting piece, and the first nylon roller is arranged toward the outer wall of the inner tube 1; the first L-shaped limiting device is formed by vertically welding two first H-shaped steels; the first nylon roller is connected to a first H-shaped steel through a first connecting piece; and another first H-shaped steel is welded to the outer sleeve hole flange.

[0012] Preferably, a guide rail is further provided on the outside of the outer sleeve entrance hole to support the inner tube.

[0013] Preferably, the outlet water stop wall is located at the outlet position of the outer casing, and is built upward from the bottom of the inner wall of the outlet pipe wall, and is stacked, and its horizontal height is higher than the predetermined water level line; the inner pipe end water stop wall is arranged at the end of the inner pipe in the first section, and is built upward from the bottom of the inner wall of the end of the inner pipe, and is stacked, and its horizontal height is higher than the predetermined water level line.

[0014] Preferably, the outlet water-stopping device comprises: an outlet flange, an outlet rubber water-stopping curtain, an outlet water-stopping baffle and a plurality of outlet connecting pieces.

[0015] Among them, the outlet flange is an annular structure, located on the inner side of the outlet water stop wall, with an L-shaped cross section, and its L-shaped longitudinal beam is installed on the inner wall of the outlet of the outer sleeve, and the L-shaped cross beam is connected to the outlet water stop baffle through a plurality of the outlet connecting parts; the outlet rubber water stop curtain is located in the middle part of the outlet flange and the outlet water stop baffle, and is clamped and fixed by the outlet flange and the outlet water stop baffle.

[0016] Preferably, the limiting roller is installed on the inner wall of the outer sleeve, and each of the limiting rollers includes: a second H-shaped steel, a support plate, a fastener, a second nylon roller and a second connecting piece, and the second nylon roller is arranged toward the outer wall of the inner tube.

[0017] Wherein, the second nylon roller is connected to the upper part of the second H-shaped steel through a second connecting piece; the lower part of the second H-shaped steel is welded to the support plate; a fixing hole is opened on the support plate, and the support plate can be fixed to the inner wall of the outer sleeve by fasteners.

[0018] Preferably, the anti-collision roller at the inner tube end includes: a third H-shaped steel, a third nylon roller and a third connecting piece, and the third nylon roller is arranged toward the inner wall of the outer tube.

[0019] Wherein, the third nylon roller is connected to the upper part of the third H-shaped steel through a third connecting piece; the lower part of the third H-shaped steel is welded to the outer wall of the end of the inner pipe.

[0020] Preferably, the limit roller is symmetrically installed below the horizontal center line of the outer tube, forming a certain angle with the horizontal center line of the outer tube; the anti-collision roller at the end of the inner tube is installed above the horizontal center line of the inner tube, forming a certain angle with the horizontal center line of the inner tube.

[0021] In summary, compared with the prior art, the buoyancy pipe penetration construction method provided by the present invention has at least the following beneficial effects:

[0022] (1) The present invention uses water as a carrier between the outer casing and the inner pipe, which greatly increases the bearing capacity and wear resistance of the carrier between the casings, reduces the friction force of the inner pipe, improves the construction efficiency, and shortens the overall construction period;

[0023] (2) The present invention is provided with an inlet water-stopping device and an outlet water-stopping device at both ends of the outer casing, and both use rubber water-stopping curtains to seal the water source, which has good airtightness and can effectively prevent water from leaking out;

[0024] (3) The present invention effectively solves the problems of insufficient roller structure strength, poor durability, and easy damage to the outer anti-corrosion layer of the pipeline in the traditional roller launching method, the caster method for installing the caster on the outer wall of the pipeline, and the pulley group propulsion method. It is particularly suitable for internal pipe construction with large diameter, long distance, and high requirements for the protection of finished products, and has good economy and implementation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A flow chart of a buoyancy pipe threading process provided by an embodiment of the present invention;

[0026] Figure 2 A schematic longitudinal section diagram of a buoyancy pipe penetration according to an embodiment of the present invention;

[0027] Figure 3 A schematic cross-sectional view of a buoyancy pipe entry hole provided by an embodiment of the present invention;

[0028] Figure 4 A schematic cross-sectional view of a buoyancy pipe jacking process provided by an embodiment of the present invention;

[0029] Figure 5 A schematic cross-sectional view of a buoyancy pipe outlet provided by an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of a buoyancy pipe entry water-stopping device provided in one embodiment of the present invention;

[0031] Figure 7 A schematic diagram of a buoyancy pipe-through-hole water-stopping device provided in one embodiment of the present invention;

[0032] FIG8(a) is a front view of a buoyancy tube-through-hole-entry limiting roller provided in one embodiment of the present invention; FIG8(b) is a side view of a buoyancy tube-through-hole-entry limiting roller provided in one embodiment of the present invention;

[0033] FIG9(a) is a front view of an anti-collision roller at the end of a buoyant pipe-through outer casing provided by an embodiment of the present invention; FIG9(b) is a side view of an anti-collision roller at the end of a buoyant pipe-through outer casing provided by an embodiment of the present invention;

[0034] FIG10( a ) is a top view of a buoyant tube-penetrating inner limiting roller provided in one embodiment of the present invention; FIG10( b ) is a front view of a buoyant tube-penetrating inner limiting roller provided in one embodiment of the present invention; FIG10( c ) is a side view of a buoyant tube-penetrating inner limiting roller provided in one embodiment of the present invention;

[0035] Fig.11 A reference diagram for calculating the buoyancy of a buoyancy pipe provided in accordance with an embodiment of the present invention.

[0036] Reference numerals:

[0037] Internal pipe 1

[0038] Outer sleeve 2

[0039] Outer casing hole flange 3

[0040] Water stop device at the entrance 4

[0041] Entrance limit device 5

[0042] Water-stop device at the exit 6

[0043] Internal pipe end water stop wall 7

[0044] Exit water stop wall 8

[0045] Precast concrete pad 10

[0046] Predetermined water level 11

[0047] Limit roller 12

[0048] Internal pipe end anti-collision roller 13

[0049] Inlet flange 14

[0050] Rubber waterproof curtain for entrance 15

[0051] Water stop baffle at the entrance 16

[0052] Entrance connector 17

[0053] Outlet flange 18

[0054] Rubber waterproof curtain at the exit 19

[0055] Water stop baffle 20

[0056] Outlet connector 21

[0057] First H-beam 22

[0058] First nylon roller 23

[0059] First connecting member 24

[0060] Second H-beam 25

[0061] Support plate 26

[0062] Second nylon roller 27

[0063] The second connecting member 28

[0064] Fasteners 29

[0065] The third H-beam 30

[0066] The third nylon roller 31

[0067] The third connecting member 32

[0068] Guide Rail 33 DETAILED DESCRIPTION

[0069] The following is combined with Figures 1 to 11 , the present invention is further explained by describing a preferred specific embodiment in detail.

[0070] It should be noted that the drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the embodiments of the present invention, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention.

[0071] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only the elements explicitly listed, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0072] like Figure 1 , Figure 2 , Figure 4 As shown, the present invention provides a buoyancy pipe penetration construction method, which utilizes buoyancy to penetrate the inner pipe 1 in the middle part of the outer sleeve 2, and specifically comprises the following steps:

[0073] S1, install an inlet water stop device 4 and an inlet limit device 5 at one end of the outer sleeve 2 as the inlet, and install an outlet water stop device 6 and an outlet water stop wall 8 at the other end of the outer sleeve 2 as the outlet;

[0074] S2, precast concrete pads 10 are evenly spaced along the axial direction at the bottom of the cavity inside the outer sleeve 2, and limiting rollers 12 (such as Figure 4 shown);

[0075] S3, using the power system to push the end of the first section of the inner tube 1 into the water-stopping device 4 at the entrance of the cave for a first set distance, and then making the inner tube end water-stopping wall 7 at the end of the inner tube 1, and installing the inner tube end anti-collision roller 13 at the end of the inner tube 1; it should be noted that, in this embodiment, the inner tube 1 is composed of a plurality of sections of tubular structures rather than a very long complete continuous pipe, and the use of a plurality of relatively short pipes is conducive to the jacking of the inner tube 1, which is convenient for operation and improves efficiency; in this embodiment, the first set distance is preferably 0.5m;

[0076] S4, inject water between the outer sleeve 2 and the inner sleeve 1, and after reaching the predetermined water level 11, the inner sleeve 1 continues to take over and advance normally; it should be noted that the predetermined water level 11 of water injection needs to be calculated in advance according to the buoyancy of the inner sleeve 1, and due to factors such as the advancement of the inner sleeve 1, the leakage of the outer sleeve 2, and the evaporation of water, the water level in the outer sleeve 2 will change continuously, so it is necessary to perform operations such as pumping and draining in real time, and monitor the water level in real time to ensure that the water level is always at the predetermined water level 11;

[0077] S5, when the inner pipe 1 is pushed to the second set distance in front of the water stop device 6 at the exit, the pushing is stopped, and the anti-collision roller 13 at the end of the inner pipe is removed, and the pushing is continued; in this embodiment, the second set distance is preferably 1m;

[0078] S6, after the inner pipe 1 pushes out of the hole water-stopping device 6, the advancement is stopped, the water source between the hole water-stopping device 6 and the hole water-stopping wall 8 is discharged, and the hole water-stopping wall 8 is removed;

[0079] S7, continue to push the inner tube 1 to the outside of the hole of the outer tube 2, and complete the pushing of the inner tube 1;

[0080] S8, draining the water source between the inner pipe 1 and the outer pipe 2, so that the inner pipe 1 falls vertically onto the precast concrete pad 10;

[0081] S9, dismantle the inner pipe end water stop wall 7 to complete the buoyancy pipe construction.

[0082] In this embodiment, the outer casing 2 is a reinforced concrete jacking pipe with an inner diameter of 4000 mm; the inner pipe 1 is a steel pipe with an outer diameter of 3600 mm and a wall thickness of 30 mm; before the buoyancy pipe construction, the following preparations need to be performed:

[0083] like Figure 2 and Figure 4 As shown, the entrance water-stopping device 4 and the entrance limiting device 5 need to be installed at the entrance; the exit water-stopping device 6 and the exit water-stopping wall 8 need to be installed at the exit; the precast concrete pads 10 are evenly spaced below the cavity inside the outer casing 2, and limiting rollers 12 are installed on the corresponding two sides of the inner wall of the outer casing 2.

[0084] Further, such as Figure 3 and Figure 6 As shown, the inlet water-stopping device 4 comprises: an inlet flange 14, an inlet rubber water-stopping curtain 15, an inlet water-stopping baffle 16 and a plurality of inlet connectors 17. The inlet flange 14 is an annular structure with a T-shaped cross section, and its T-shaped longitudinal beam is installed on the inner wall of the inlet of the outer casing 2, and the T-shaped cross beam is connected to the inlet water-stopping baffle 16 through a plurality of inlet connectors 17; the inlet rubber water-stopping curtain 15 is located in the middle part of the inlet flange 14 and the inlet water-stopping baffle 16, and is clamped and fixed by the inlet flange 14 and the inlet water-stopping baffle 16. Among them, the inlet water-stopping baffle 16 and the inlet rubber water-stopping curtain 15 are both annular structures, and a plurality of inlet connectors 17 are distributed around the inlet flange 14 to fix the inlet water-stopping baffle 16 on the inlet flange 14. In addition, the length of the inlet rubber waterproof curtain 15 is respectively greater than the length of the inlet flange 14 and the inlet waterproof baffle 16, so as to ensure that the inner pipe 1 can fit tightly with the inlet rubber waterproof curtain 15 when pushing in, so as to prevent water leakage. In this embodiment, the inlet connector 17 adopts a bolt assembly, and the inlet flange 14 is a pipe flange.

[0085] Further, such as Figure 3As shown in FIG8(a) and FIG8(b), the outer wall of the hole entrance of the outer sleeve 2 is annularly provided with an outer sleeve hole flange 3, and the hole entrance limiting device 5 is welded to the outer side of the outer sleeve hole flange 3. Specifically, there are three hole entrance limiting devices 5, which are respectively arranged directly above the hole entrance of the outer sleeve and on the corresponding two sides in the horizontal direction. Each hole entrance limiting device 5 includes: a first L-shaped limiting device, a first nylon roller 23 and a first connecting member 24, and the first nylon roller 23 is arranged toward the outer wall of the inner tube 1. Among them, the first L-shaped limiting device is formed by vertically welding two first H-shaped steels 22, and then the lower rib of one of the first H-shaped steels 22 is cut to form a slot for installing the first nylon roller 23, and the first nylon roller 23 is connected to the first H-shaped steel 22 through the first connecting member 24, and finally the other first H-shaped steel 22 is welded to the outer sleeve hole flange 3, thereby obtaining the hole entrance limiting device 5. In this embodiment, the first connecting member 24 adopts a bolt assembly, and the first nylon roller 23 is spaced 20 to 30 mm away from the outer wall of the inner pipe 1 to ensure that the inner pipe 1 will not be excessively rubbed due to the small distance between the first nylon roller 23 and the pipe wall during jacking. This can effectively protect the outer wall of the inner pipe 1, extend its service life, and reduce maintenance costs during construction.

[0086] Further, such as Figure 2 and Figure 3 As shown, a guide rail 33 is further provided outside the hole entrance of the outer sleeve 2 to carry the inner tube 1 and guide the pushing direction of the inner tube 1.

[0087] It can be understood that the jacking principle of the inner pipe 1 of the present invention is as follows: first, the first section of the inner pipe 1 is jacked on the guide rail 33. After the first section of the inner pipe 1 is partially jacked, the pipe connection operation is performed on the guide rail 33, and the second section of the inner pipe is welded to the first section of the inner pipe 1. Then, the jacking is continued and the third section of the inner pipe is welded. This cycle is repeated until the entire jacking process is completed.

[0088] In addition, the hole entrance limiting device 5 combined with the guide rail 33 supporting the inner pipe 1 at the bottom can play a good limiting and fixing role, so that the inner pipe 1 that has been pushed in will not be displaced due to water buoyancy when the pipe is connected, thereby improving the efficiency of the pipe connection construction.

[0089] Further, such as Figure 2 and Figure 5As shown, the outlet water-stop wall 8 is located at the outlet position of the outer casing 2, and is built upward from the bottom of the inner wall of the outlet pipe wall and stacked, and its height is higher than the predetermined water level line 11; in this embodiment, the outlet water-stop wall 8 is built with concrete solid bricks and MU10 cement mortar, with a wall thickness of 400mm, a wall top height of 300mm to 500mm higher than the predetermined water level, and cement mortar is used to plaster both sides of the wall to prevent water leakage between the casings.

[0090] Further, such as Figure 2 , Figure 5 and 7 As shown, the exit water-stopping device 6 is installed on the inner side of the exit water-stopping wall 8 and has a third set distance from the inner wall of the exit water-stopping wall 8. In this embodiment, the third set distance is set to 1m.

[0091] Furthermore, the outlet water-stop device 6 comprises: an outlet flange 18, an outlet rubber water-stop curtain 19, an outlet water-stop baffle 20 and a plurality of outlet connectors 21. The outlet flange 18 is an annular structure, located on the inner side of the outlet water-stop wall 8, and has an L-shaped cross section. Its L-shaped longitudinal beam is installed on the inner wall of the outlet of the outer sleeve 2, and the L-shaped cross beam is connected to the outlet water-stop baffle 20 through a plurality of outlet connectors 21; the outlet rubber water-stop curtain 19 is located in the middle part of the outlet flange 18 and the outlet water-stop baffle 20, and is clamped and fixed by the outlet flange 18 and the outlet water-stop baffle 20. The outlet water-stop baffle 20 and the outlet rubber water-stop curtain 19 are both annular structures, and a plurality of the outlet connectors 21 are distributed around the outlet flange 18 to fix the outlet water-stop baffle 20 on the outlet flange 18. In addition, the length of the outlet rubber water-stop curtain 19 is respectively greater than the length of the outlet flange 18 and the outlet water-stop baffle 20, so as to ensure that the inner pipe 1 can fit tightly with the outlet rubber water-stop curtain 19 when it continues to push forward, so as to avoid water leakage. In this embodiment, the outlet connector 21 adopts a bolt assembly, and the outlet flange 18 is a pipe flange.

[0092] Further, such as Figure 2 and Figure 4 As shown, the height of the precast concrete pad 10 is the designed clearance height between the inner tube 1 and the outer tube 2, which is designed according to the requirements, and is evenly spaced at the bottom of the cavity inside the outer tube 2. In this embodiment, the precast concrete pad 10 is precast with C30 concrete, the height is the designed clearance height between the inner tube 1 and the outer tube 2, the width is 1m, the length is 0.4m, and one is arranged at intervals of 8 to 10m.

[0093] Further, such as Figure 4 , Figure 10(a) , 10(b) As shown in FIG. 10( c ), the limiting roller 12 is made of a second H-shaped steel 25, a support plate 26, a fastener 29, a second nylon roller 27 and a second connecting member 28, and the second nylon roller 27 is arranged toward the outer wall of the inner tube 1. Specifically, firstly, the upper rib of the second H-shaped steel 25 is cut to form a slot for installing the second nylon roller 27, and the second nylon roller 27 is connected to the second H-shaped steel 25 through the second connecting member 28; secondly, the lower part of the second H-shaped steel 25 is welded to the support plate 26; finally, holes are opened at the four corners of the support plate 26 to install the fastener 29, and the support plate 26 is fixed to the inner wall of the outer tube 2 through the fastener 29 to achieve the function of limiting and fixing. In this embodiment, the fastener 29 is an expansion bolt, and the second connecting member 28 is a bolt assembly. In the present invention, the limiting roller plays the role of fixing the pipe position, limiting the movement range of the pipeline, and promoting the guide, so that the present invention can be applied to some internal pipe construction with a large curvature radius.

[0094] Further, such as Figure 4 As shown in Figures 9(a) and 9(b), after the end of the first section of the inner tube 1 is pushed into the water-stopping device 4 at the entrance, the anti-collision roller 13 of the inner tube end is installed. Among them, the anti-collision roller 13 of the inner tube end is made of a third H-shaped steel 30, a third nylon roller 31 and a third connecting piece 32, and the third nylon roller 31 is arranged toward the inner wall of the outer sleeve 2. Specifically, firstly, the upper rib of the third H-shaped steel 30 is cut to form a groove for installing the third nylon roller 31, and the third nylon roller 31 is connected to the third H-shaped steel 30 through the third connecting piece 32; then, the lower part of the third H-shaped steel 30 is welded to the outer wall of the end of the inner tube 1, thereby playing an anti-collision role, avoiding the inner tube 1 from being damaged by impact during the jacking process, and even damaging the outer anti-corrosion coating of the inner tube 1.

[0095] Furthermore, if Figure 4As shown, in this embodiment, the limiting roller 12 is arranged in a group every 20m to 30m, and each group contains 2 rollers, which are symmetrically installed below the horizontal center line of the outer sleeve 2, and the angle with the horizontal center line of the outer sleeve 2 is 10°; the inner tube end anti-collision roller 13 is installed on both sides of the outer wall of the end of the inner tube 1, and contains 2 rollers in total, which are installed above the horizontal center line of the inner tube 1, and the angle with the horizontal center line of the inner tube 1 is 10°. It can be understood that the limiting roller 12 and the inner tube end anti-collision roller 13 are arranged alternately. In addition, the position of the limiting roller 12 under this design is higher than the predetermined water level line 11, which can make it easy to observe the use of the limiting roller 12 during the tube wearing process; the inner tube end anti-collision roller 13 under this design can play a good anti-collision role while avoiding the limiting roller 12.

[0096] Further, such as Figure 2 As shown, after the end of the first section of the inner tube 1 is pushed into the water-stopping device 4 at the entrance, an inner tube end water-stopping wall 7 is made at the end of the inner tube 1 of this section. The inner tube end water-stopping wall 7 is built from the bottom of the inner wall of the end of the inner tube 1 upwards and stacked, and its height is higher than the predetermined water level line 11. In this embodiment, the inner tube end water-stopping wall 7 is built with concrete solid bricks and MU10 cement mortar, with a wall thickness of 400mm, a wall top height of 300mm to 500mm higher than the predetermined water level, and both sides of the wall are plastered with cement mortar, which can prevent the water source between the outer casing 2 and the inner tube 1 from flowing into the inner tube 1, and effectively cut off the water flow.

[0097] Further, such as Figure 2 As shown, water is injected into the outer casing 2 from the receiving well to make the water level reach the height of a predetermined water level line 11, wherein the height of the predetermined water level line 11 is: the water surface height when the water buoyancy causes the inner pipe 1 to float to a height higher than the concrete pad 10.

[0098] like Fig.11 As shown, the predetermined water level line 11 is calculated by a preferred embodiment. In this embodiment, the outer sleeve 2 is a reinforced concrete pipe with an inner diameter of 4000mm, the inner pipe 1 has an outer diameter of 3260mm, a wall thickness of 30mm, and a steel density of 7.85t / m 3 The steel pipe, from which the weight of each meter of pipe is 2.3885t, the height of the predetermined water level line 11 is calculated as follows:

[0099] According to the buoyancy calculation formula: F 浮 =G 排 ;

[0100] It can be obtained that when the inner pipe 1 with an outer diameter of 3260mm and a wall thickness of 34mm floats on the water surface, the volume of water that needs to be displaced per meter of pipe is 2.3885m 3 ;

[0101] That is, the cross-sectional area of ​​the outer wall of the pipe immersed in water is S = 2.3885 m2;

[0102] Introduce the arc area formula: S = 0.5r 2 (θ-sinθ);

[0103] Substitute the value 2.3885 = 0.5 × 1.63 2 (θ-sinθ);

[0104] Using Newton's iteration method, we can solve for θ (center angle) = 2.44195 (radians);

[0105] Then the height of the predetermined water level line 11 from the center line of the inner pipe 1 is: h = r·cos(θ / 2);

[0106] Calculated h = 0.559m;

[0107] During the buoyancy pipe penetration process, the distance between the inner pipe 1 and the precast concrete pad 10 is controlled to be h′=50 mm;

[0108] Then the height of the predetermined water level line 11 is: H = (R + h') - h;

[0109] Substituting the numerical value, we get H=1.491m.

[0110] After the water source is injected to the predetermined water level line 11 of 1.491m, the conventional pipe connection and advancement stage is entered. However, due to the influence of factors such as water evaporation, leakage in small parts, the advancement length and volume increase of the inner pipe 1, the water level in the outer casing 2 will change. Furthermore, it is necessary to monitor the water level in the outer casing 2 during the conventional pipe connection and advancement stage, and adjust the water level in the pipe through measures such as pumping and drainage to keep it within the predetermined water level range of 1.491m±25mm; thereby avoiding collision between the inner pipe 1 and the outer casing 2 or the precast concrete pad 10 below due to excessively high or low water levels, or causing tearing of the rubber water-stop curtain 15 at the entrance and the rubber water-stop curtain 19 at the exit.

[0111] Furthermore, in this embodiment, the buoyancy tube propulsion process also includes the following contents:

[0112] Specifically, Figure 2 and Figure 4As shown, the inner tube 1 stops pushing when it reaches a certain interval position before the water-stopping device 6 at the hole. In this embodiment, the interval position is 50 cm. At this time, the anti-collision roller 13 at the end of the inner tube is removed to prevent the anti-collision roller 13 at the end of the inner tube from colliding with the water-stopping device 6 at the hole. At this time, the inner tube 1 is close to the water-stopping device 6 at the hole, and the limiting roller 12 in the outer sleeve 2 can be used to guide and continue to push, so that the end of the inner tube 1 passes through the water-stopping device 6 at the hole.

[0113] Specifically, the inner pipe 1 stops advancing 50 cm after passing through the exit water stop device 6. At this time, the inner pipe 1 is tightly fitted with the exit rubber water stop curtain 19, and the water source between the outer sleeve 2 and the inner pipe 1 is blocked by the inlet water stop device 4 and the exit water stop wall 8 instead of the inlet water stop device 4 and the exit water stop device 6; at this time, the water source between the exit water stop device 6 and the exit water stop wall 8 is drained, and the exit water stop wall 8 is removed to facilitate the inner pipe 1 to exit the hole.

[0114] Specifically, when the end of the inner tube 1 pushes out a distance from the end of the outer tube 2, the pushing of the inner tube 1 is completed. In the present embodiment, the distance is 0.5 m. At this time, the water source between the outer tube 2 and the inner tube 1 can be discharged by adjusting the outlet water-stopping baffle 20 of the outlet water-stopping device 6 and loosening the outlet rubber water-stopping curtain 19. At this time, the inner tube 1 will fall vertically onto the precast concrete pad 10 under the limit of the limit device 12 in the outer tube 2, reaching the designed height. Finally, the inner tube end water-stopping wall 7 is removed to complete all the work of pushing the inner tube 1.

[0115] In summary, the present invention provides a method for buoyancy pipe penetration of built-in pipes in a jacking casing, which uses a water source as a carrier between the outer casing and the inner pipe, greatly increasing the bearing capacity and wear resistance of the carrier between the casings, reducing the friction force of the inner pipe propulsion, improving the construction efficiency, and shortening the overall construction period. The present invention is provided with an inlet water-stopping device and an outlet water-stopping device at both ends of the outer casing, both of which use rubber water-stopping curtains to seal the water source, have good airtightness, and can prevent water leakage. The present invention is respectively equipped with limiting rollers at the inlet position, the inner wall of the outer casing, and the end of the inner pipe. The limiting rollers play the role of fixing the pipe position and promoting the guide, which can make the present invention suitable for some inner pipe construction with a large curvature radius; at the same time, the limiting rollers are all made of nylon, and the various devices and the inner pipe are all softly connected, which plays a good protective role for the anti-corrosion coating of the inner pipe. In addition, the present invention effectively solves the problems of insufficient roller structure strength, poor durability, and easy damage to the outer anti-corrosion layer of the pipeline in the traditional roller launching method, the caster method for installing the casters on the outer wall of the pipeline, and the pulley group propulsion method. It is particularly suitable for internal pipe construction with large diameter, long distance, and high requirements for finished product protection, and has good economy and implementation effect.

[0116] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A buoyancy pipe penetration construction method, which utilizes buoyancy to penetrate the inner pipe in the middle part of the outer sleeve, characterized in that: The specific steps include: S1. Install an inlet water stop device and an inlet limit device on one end of the outer casing as the inlet, and install an outlet water stop device and an outlet water stop wall on the other end of the outer casing as the outlet; S2, precast concrete pads are evenly spaced along the axial direction at the bottom of the cavity inside the outer sleeve, and limiting rollers are installed on the inner wall of the outer sleeve; S3, using a power system to push the end of the first section of the inner pipe into the water-stopping device at the entrance of the cave for a first set distance, then making an inner pipe end water-stopping wall at the end of the inner pipe, and installing an inner pipe end anti-collision roller at the end of the inner pipe; S4, injecting water between the outer sleeve and the inner pipe, and after reaching a predetermined water level, the inner pipe continues to be connected and advanced normally; S5, when the inner pipe is advanced to the second set distance in front of the water stop device at the exit hole, the advancement is stopped, and the advancement is continued after the anti-collision roller at the end of the inner pipe is removed; S6, after the inner pipe is pushed out of the hole water-stopping device, the advancement is stopped, the water source between the hole water-stopping device and the hole water-stopping wall is discharged, and the hole water-stopping wall is removed; S7, continue to push the inner tube to the outside of the hole of the outer tube, and complete the pushing of the inner tube; S8, draining the water source between the inner pipe and the outer pipe, so that the inner pipe falls vertically onto the precast concrete pad; S9, dismantle the inner pipe end water stop wall to complete the buoyancy pipe construction.

2. The buoyancy pipe-threading construction method according to claim 1, characterized in that: The inlet water-stopping device comprises: an inlet flange, an inlet rubber water-stopping curtain, an inlet water-stopping baffle and a plurality of inlet connectors; The inlet flange is an annular structure with a T-shaped cross section, and its T-shaped longitudinal beam is installed on the inner wall of the inlet of the outer casing, and the T-shaped cross beam is connected to the inlet water stop baffle through a plurality of inlet connectors; The rubber waterproof curtain cloth at the entrance is located in the middle part of the entrance flange and the entrance waterproof baffle plate, and is clamped and fixed by the entrance flange and the entrance waterproof baffle plate.

3. The buoyancy pipe-threading construction method according to claim 1, characterized in that: The outer wall of the hole inlet of the outer sleeve is annularly provided with an outer sleeve hole inlet flange, and the hole inlet limiting device is welded to the outer side of the outer sleeve hole inlet flange.

4. The buoyancy pipe-threading construction method according to claim 3, characterized in that: The hole entrance limiting devices are respectively arranged directly above the hole entrance of the outer sleeve and on the corresponding two sides in the horizontal direction; wherein each of the hole entrance limiting devices includes: a first L-shaped limiting device, a first nylon roller and a first connecting piece, and the first nylon roller is arranged toward the outer wall of the inner tube 1; the first L-shaped limiting device is formed by vertically welding two first H-shaped steels; the first nylon roller is connected to a first H-shaped steel through a first connecting piece; and another first H-shaped steel is welded to the outer sleeve hole flange.

5. The buoyancy pipe-threading construction method according to claim 1, characterized in that: A guide rail is also provided outside the hole entrance of the outer sleeve to support the inner tube.

6. The buoyancy pipe-threading construction method according to claim 1, characterized in that: The outlet water stop wall is located at the outlet of the outer casing, and is built from the bottom of the inner wall of the outlet pipe wall upwards and stacked, and its horizontal height is higher than the predetermined water level line; The inner pipe end water stop wall is arranged at the end of the inner pipe of the first section, and is built upward from the bottom of the inner wall of the end of the inner pipe and stacked, and its horizontal height is higher than the predetermined water level line.

7. The buoyancy pipe-threading construction method according to claim 1, characterized in that: The outlet water-stopping device comprises: an outlet flange, an outlet rubber water-stopping curtain, an outlet water-stopping baffle and a plurality of outlet connectors; The outlet flange is an annular structure, located on the inner side of the outlet water stop wall, and has an L-shaped cross section. Its L-shaped longitudinal beam is installed on the inner wall of the outlet of the outer casing, and the L-shaped cross beam is connected to the outlet water stop baffle through a plurality of outlet connectors. The outlet rubber waterproof curtain is located in the middle part of the outlet flange and the outlet waterproof baffle, and is clamped and fixed by the outlet flange and the outlet waterproof baffle.

8. The buoyancy pipe-threading construction method according to claim 1, characterized in that: The limiting roller is installed on the inner wall of the outer sleeve, and each of the limiting rollers includes: a second H-shaped steel, a support plate, a fastener, a second nylon roller and a second connecting piece, and the second nylon roller is arranged toward the outer wall of the inner tube; Wherein, the second nylon roller is connected to the upper part of the second H-shaped steel through a second connecting piece; the lower part of the second H-shaped steel is welded to the support plate; a fixing hole is opened on the support plate, and the support plate can be fixed to the inner wall of the outer sleeve by fasteners.

9. The buoyancy pipe-threading construction method according to claim 8, characterized in that: The inner pipe end anti-collision roller comprises: a third H-shaped steel, a third nylon roller and a third connecting piece, and the third nylon roller is arranged toward the inner wall of the outer sleeve; Wherein, the third nylon roller is connected to the upper part of the third H-shaped steel through a third connecting piece; the lower part of the third H-shaped steel is welded to the outer wall of the end of the inner pipe.

10. The buoyancy pipe-threading construction method according to claim 9, characterized in that: The limit roller is symmetrically installed below the horizontal center line of the outer tube and forms a certain angle with the horizontal center line of the outer tube; the anti-collision roller at the end of the inner tube is installed above the horizontal center line of the inner tube and forms a certain angle with the horizontal center line of the inner tube.

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