Super-long curved pipe jacking construction method with shallow covering and super-large caliber

Abstract

This invention relates to a method for constructing ultra-large diameter, ultra-long curved pipe jacking in shallow overburden sections, comprising a long-distance pipe jacking sludge removal system, a movable counterweight structure in shallow overburden sections, a shallow overburden grouting system, a curve pre-adjustment device, and a movable support frame; including the following steps: sludge application in the shallow overburden section, counterweight application in the shallow overburden section, pipe jacking adjustment in the curved section, and construction at the underwater pipe joints. The beneficial effects of this invention are: it introduces a long-distance pipe jacking sludge removal system and a shallow overburden grouting system, solving the problem of sludge sedimentation over long distances and achieving precise control of grouting pressure; it proposes a movable counterweight structure in shallow overburden sections, which, by setting a ring plate at the bottom of the pipe, avoids damage to the pipe sections due to pressure and prevents the pipe from floating in the shallow overburden section, resulting in excellent anti-buoyancy performance; and it develops a curve pre-adjustment device with a reasonable structural design, enabling rapid positioning of the pipe in the curved section and simplifying operation.

Description

Technical Field

[0001] This invention belongs to the field of pipe jacking construction, and particularly relates to a method for constructing ultra-large diameter ultra-long curved pipe jacking in shallow soil, which is mainly applicable to the construction of ultra-large diameter ultra-long curved pipe jacking in shallow soil. Background Technology

[0002] With the rapid development of China's economy, the development and exploration of urban underground space has become a hot topic in urban construction. The demand for underground space development is increasing, and pipe jacking has become an important part of trenchless underground construction. Pipe jacking offers certain advantages for dealing with the complex underground pipelines, traffic, environmental protection, and geological conditions in cities. Currently, domestic pipe jacking technology is maturing, and its development is moving towards higher construction challenges, gradually moving towards longer distances, larger diameters, greater burial depths, and shallower overburden, placing increasingly higher demands on pipe jacking construction techniques.

[0003] Traditional shallow-covered soil construction employs open excavation followed by pipe jacking. This method is suitable for excavation work on land, with low construction difficulty, simple pipe installation, and good seepage prevention at the pipe joints. However, when underwater pipe jacking encounters shallow-covered soil strata, especially when the thinnest soil cover is only 9m with 7m of silt, such high-risk pipe jacking can easily cause problems such as head displacement, body displacement, and poor segment installation accuracy. Therefore, it is necessary to innovate the control of shallow-covered soil jacking construction parameters, underwater mud replacement technology, and underwater emergency treatment technology.

[0004] In view of this, in response to a series of problems encountered in the construction of ultra-large diameter and ultra-long curved pipe jacking in shallow soil, there is an urgent need to invent a simple and effective construction method for ultra-large diameter and ultra-long curved pipe jacking in shallow soil to improve the safety of pipe jacking construction, especially for pipe jacking construction in shallow soil and curved pipe jacking areas, which can significantly save construction costs, speed up construction progress and improve construction safety performance. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for constructing ultra-large diameter, ultra-long curved pipe jacking in shallow soil.

[0006] This shallow-covered, ultra-large-diameter, ultra-long curved pipe jacking construction structure includes a long-distance pipe jacking mud removal system, a shallow-covered movable counterweight structure, a shallow-covered grouting system, a curve pre-adjustment device, and a mobile support frame.

[0007] The long-distance pipe jacking sludge removal system includes pipe jacking sections and counterweight guide rails; counterweight water tanks are installed on the counterweight guide rails, and the counterweight water tanks are connected to multi-stage sedimentation tanks.

[0008] The shallow overburden grouting system includes a grouting ring pipe and grouting holes at the joints of the jacking pipe sections;

[0009] The shallow-covered movable counterweight structure includes a counterweight frame that moves at the bottom of the jacking pipe section, and a water supply pipe is installed at the bottom of the counterweight frame.

[0010] The curve pre-adjustment device includes a locking steel plate and a jack. The locking steel plate and jack are installed at the tongue and groove of the jacking pipe section, and a grouting steel pipe is welded under the locking steel plate.

[0011] The movable support frame includes an inner ring frame, an outer ring frame, and a steel ring frame. Fixed supports are welded onto the inner and outer ring frames. One end of the fixed support is equipped with a self-rotating handle, and the other end supports the steel ring frame through a movable support rod. A movable bracket is welded to the bottom of the outer ring frame.

[0012] As a preferred embodiment: in the long-distance pipe jacking and sludge removal system, the pipe sections are connected by ring plates, a counterweight guide rail is provided behind the pipe jacking machine, a guide rail frame is provided on the counterweight guide rail, a counterweight water tank is provided on the guide rail frame, the counterweight water tank is connected to a multi-stage sedimentation tank through a water supply pipe, a water pump is provided on the water supply pipe, and a water storage tank is provided outside the caisson.

[0013] As a preferred embodiment: In the shallow overburden grouting system, grouting holes are provided at the joints of the jacking pipe sections, the grouting holes are connected to grouting ring pipes, the grouting ring pipes are connected to main pipes, grouting check valves are provided in the grouting holes, grouting check valves are connected to pressure-resistant rubber valves, and pressure-resistant rubber valves are connected to tees.

[0014] As a preferred embodiment: In the shallow overburden movable counterweight structure, grouting pipes, ventilation pipes, and ventilation ducts are respectively installed on both sides of the jacking pipe section via angle steel supports. The angle steel supports are provided with positioning grooves, and one end of a screw is inserted into the positioning groove. The other end of the screw is connected to a sleeve, which is pre-embedded inside both sides of the jacking pipe section. A ring plate is provided at the bottom of the jacking pipe section, and a channel steel frame is provided on the ring plate. An anti-slip walkway is laid on the channel steel frame, and a guide rail is provided on the channel steel frame. The guide rail is connected to a counterweight frame, and baffle plates are provided on both sides of the counterweight frame. A water supply pipe is provided at the bottom of the counterweight frame.

[0015] Preferably, the tongue and groove joint of the jacking pipe section is provided with a locking steel plate, and a grouting steel pipe is welded under the locking steel plate. Water-swellable rubber strips are pre-embedded between the jacking pipe sections. A cylinder groove is pre-set at the tongue and groove joint of the jacking pipe section. A jack is installed in the cylinder groove. A pine board is placed in front of the jack. Ear plates and connecting vertical plates are provided at the bottom of the jacking pipe section interface. The connecting vertical plates are fixed together with bolts.

[0016] As a preferred embodiment: In the movable support frame, a connecting rib is welded between the inner ring frame and the outer ring frame, a fixed support is welded on the inner ring frame and the outer ring frame, a movable support rod is sleeved on the fixed support, a self-rotating handle is provided at one end of the fixed support, an enlarged end is provided at one end of the movable support rod, the enlarged end supports the inner side of the steel ring frame, a movable bracket is welded to the bottom of the outer ring frame, and a fixing screw is provided on the movable bracket.

[0017] The construction method for this type of shallow-cover, ultra-large-diameter, ultra-long curved pipe jacking structure includes the following steps:

[0018] S1. Mud construction in shallow overburden sections; construction of long-distance pipe jacking and mud removal system. During the pipe jacking process, thixotropic mud is injected into the outer wall of the pipe. The pipe jacking machine is equipped with three pipe sections with grouting holes. After that, one pipe section with grouting holes is set in every three sections. The grouting holes are connected to the main pipe by grouting ring pipes.

[0019] S2, counterweight construction in shallow overburden sections; when the jacking area of ​​the pipe jacking machine is located in a shallow overburden section, grouting pipes, ventilation pipes and ventilation ducts are respectively installed on both sides of the pipe section;

[0020] S3. Curved section pipe jacking adjustment construction: A curve pre-adjustment device is set between three consecutive pipe jacking sections after the pipe jacking machine. The jacks form an opening gap between the pipe jacking sections, so that the pipe jacking sections advance according to the design curve.

[0021] S4. Construction at the joint of the underwater pipe section: When the joint of the jacking pipe section is underwater and leaks, a movable support frame is used to support the steel ring frame.

[0022] As a preferred embodiment, in step S1: each jacking pipe section is provided with a grouting hole, and each grouting hole is individually controlled by a grouting check valve; the grouting check valve is connected to a pressure-resistant rubber valve, and the pressure-resistant rubber valve is connected to a tee.

[0023] The beneficial effects of this invention are:

[0024] 1) A long-distance pipe jacking mud removal system and a shallow overburden grouting system were proposed, which solved the problem of mud sedimentation over long distances and achieved precise control of grouting pressure.

[0025] 2) A movable counterweight structure for shallow overburden was proposed. By setting a ring plate at the bottom of the jacking pipe, damage to the jacking pipe section due to pressure was avoided, and the jacking pipe was prevented from floating in the shallow overburden section, with good anti-buoyancy effect.

[0026] 3) A curve pre-adjustment device was developed. The device has a reasonable structural design and can quickly position the jacking pipe on the curve section. It is easy to operate.

[0027] 4) A mobile support frame was developed, which can quickly support the steel ring frame. A mobile support is welded to the bottom of the outer ring frame, which solves the problem of transporting the support frame inside the jacking pipe and quickly solves the problem of leakage at the jacking pipe interface. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the long-distance sludge removal system of the present invention;

[0029] Figure 2 This is a schematic diagram of the shallow soil covering grouting structure of the present invention;

[0030] Figure 3 yes Figure 2 Enlarged view of region A in the middle;

[0031] Figure 4 This is a schematic diagram of the shallow-covered movable counterweight structure of the present invention;

[0032] Figure 5 This is a cross-sectional view of the curved pipe section adjustment structure of the present invention;

[0033] Figure 6 This is a plan view of the curved pipe section adjustment structure of the present invention;

[0034] Figure 7 This is a diagram showing the layout of the curved pipe section adjustment structure of the present invention;

[0035] Figure 8 This is a schematic diagram of the movable support structure of the present invention.

[0036] Among them: 1-ventilation pipe, 2-grouting pipe, 3-positioning groove, 4-sleeve, 5-angle steel bracket, 6-screw, 7-anti-slip walkway plate, 8-blocking plate, 9-guide rail, 10-counterweight frame, 11-water supply pipe, 12-guide rail frame, 13-channel steel frame, 14-ring plate, 15-ventilation duct, 16-jacking pipe section, 17-main pipe, 18-grouting hole, 19-grouting ring pipe, 20-pressure resistant rubber valve, 21-tee, 22-grouting check valve, 23-jacking machine, 24-counterweight water tank, 25-... - Water pump, 26- Multistage sedimentation tank, 27- Water storage tank, 28- Counterweight guide rail, 29- Ear plate, 30- Pine board, 31- Locking steel plate, 32- Grouting steel pipe, 33- Water-swellable rubber strip, 34- Jack, 35- Bolt, 36- Fixed vertical plate, 37- Inner ring frame, 38- Connecting rib, 39- Outer ring frame, 40- Fixed support, 41- Self-rotating handle, 42- Movable support rod, 43- Enlarged end, 44- Fixing screw, 45- Steel ring frame, 46- Sliding wheel, 47- Hydraulic cylinder groove. Detailed Implementation

[0037] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0038] Example 1

[0039] As one example, such as Figures 1 to 8 As shown, a construction structure for ultra-large diameter ultra-long curved pipe jacking in shallow soil includes a long-distance pipe jacking mud removal system, a movable counterweight structure in shallow soil, a shallow soil grouting system, a curve pre-adjustment device, and a mobile support frame.

[0040] like Figure 1As shown, the pipe sections 16 are connected by ring plates 14. A counterweight guide rail 28 is set behind the pipe jacking machine 23. A guide rail frame 12 is set on the counterweight guide rail 28. A counterweight water tank 24 is set on the guide rail frame 12. The counterweight water tank 24 is connected to the multi-stage sedimentation tank 26 through a water supply pipe 11. A water pump 25 is equipped on the water supply pipe 11. A water storage tank 27 is set outside the caisson.

[0041] like Figure 2 and Figure 3 As shown, grouting holes 18 are evenly arranged at the joint of the jacking pipe section 16. The main pipe 17 is connected to the grouting ring pipe 19. A grouting check valve 22 is installed in the grouting hole 17. The grouting check valve 22 is connected to the pressure-resistant rubber valve 20. The pressure-resistant rubber valve 20 is connected to the tee 21.

[0042] like Figure 4 As shown, grouting pipe 2, ventilation pipe 1, and ventilation duct 15 are respectively installed on both sides of the jacking pipe section 16. The pipes are erected on angle steel brackets 5. Positioning grooves 3 are provided on the angle steel brackets 5. One end of the screw 6 is inserted into the positioning groove 3, and the other end is connected to the sleeve 4. The sleeve 4 is pre-embedded during the prefabrication of the jacking pipe section 16. A ring plate 14 is installed at the bottom of the jacking pipe section 16. A channel steel frame 13 is installed on the ring plate 14. An anti-slip walkway 7 is laid on the channel steel frame 13. A guide rail 9 is installed on the channel steel frame 13. The guide rail 9 is connected to the counterweight frame 10. A baffle plate 8 is installed on the counterweight frame 10. A water supply pipe 11 is installed at the bottom of the counterweight frame 10.

[0043] like Figure 5 , Figure 6 and Figure 7 As shown, a locking steel plate 31 is provided at the tongue and groove of the jacking pipe section 16, and a grouting steel pipe 32 is welded under the locking steel plate 31. Two water-swellable rubber strips 33 are pre-embedded between the jacking pipe sections 16. A cylinder groove 47 is set during the prefabrication of the jacking pipe section 16, and a jack 34 is set in the cylinder groove 47. A pine board 30 is set in front of the jack 34. An ear plate 29 and a connecting vertical plate 36 are set at the bottom of the interface of the jacking pipe section 16. The connecting vertical plates 36 are fixed together with bolts 35.

[0044] like Figure 8 As shown, a connecting rib 38 is welded between the inner ring frame 37 and the outer ring frame 39. A fixed support 40 is welded to the inner ring frame 37 and the outer ring frame 39. A movable support rod 42 is provided inside the fixed support 40. A self-rotating handle 41 is provided at one end of the fixed support 40. An enlarged end 43 is provided at one end of the movable support rod 42. The enlarged end 43 supports the steel ring frame 45. A movable bracket 46 is welded to the bottom of the outer ring frame 39. A fixing screw 44 is provided on the movable bracket 46.

[0045] Example 2

[0046] As another embodiment, a method for constructing ultra-large diameter ultra-long curved pipe jacking in shallow soil using the shallow soil overburden ultra-large diameter ultra-long curved pipe jacking construction structure proposed in Embodiment 1 includes the following steps:

[0047] S1. Mud slurry construction in shallow overburden sections; construction of a long-distance pipe jacking and mud removal system. During the pipe jacking process, thixotropic mud is injected into the outer wall of the pipe. The pipe jacking machine 23 is equipped with three pipe sections 16 with grouting holes 18. After that, every three sections are equipped with one pipe section 16 with grouting holes 18. The grouting holes 18 are connected to the main pipe 17 by grouting ring pipes 19, which are DN25 rubber pipes. Each pipe section 16 has 6 grouting holes 18. Each grouting hole 18 is individually controlled by a grouting check valve 22, which is a DN25 ball valve. The grouting check valve 22 is connected to a pressure-resistant rubber valve 20, which is connected to a tee 21.

[0048] S2, counterweight construction in shallow overburden sections; when the jacking area of ​​the pipe jacking machine 23 is located in a shallow overburden section, grouting pipe 2, ventilation pipe 1 and ventilation duct 15 are respectively installed on both sides of the pipe jacking section 16; grouting pipe 2, ventilation pipe 1 and ventilation duct 15 are respectively installed on both sides of the pipe jacking section 16, the pipes are erected on angle steel supports 5, positioning grooves 3 are set on angle steel supports 5, one end of the screw 6 is inserted into the positioning groove 3, and the other end is connected to the sleeve 4. The sleeve 4 is pre-embedded when the pipe jacking section 16 is prefabricated, a ring plate 14 is set at the bottom of the pipe jacking section 16, a channel steel frame 13 is set on the ring plate 14, an anti-slip walkway 7 is laid on the channel steel frame 13, a guide rail 9 is installed on the channel steel frame 13, the guide rail 9 is connected to the counterweight frame 10, a baffle plate 8 is set on the counterweight frame 10, and a water supply pipe 11 is set at the bottom of the counterweight frame 10.

[0049] S3. Curved section pipe jacking adjustment construction: A curve pre-adjustment device is set between three consecutive pipe jacking sections 16 after the pipe jacking machine 23. The jacks 34 form an opening gap between the pipe jacking sections 16, so that the pipe jacking sections 16 advance according to the design curve. A locking steel plate 31 is set at the tongue and groove of the pipe jacking section 16. A grouting steel pipe 32 is welded under the locking steel plate 31. Two water-swellable rubber strips 33 are pre-embedded between the pipe jacking sections 16. A cylinder groove 47 is set during the prefabrication of the pipe jacking section 16. The jacks 34 are set in the cylinder groove 47. A pine board 30 is set in front of the jacks 34. An ear plate 29 and a connecting vertical plate 36 are set at the bottom of the interface of the pipe jacking section 16. The connecting vertical plates 36 are fixed with bolts 35.

[0050] S4. Construction at the joint of the underwater pipe section: When the joint of the jacking pipe section 16 is underwater and leaks, a movable support frame is used to support the steel ring frame 45. A connecting rib 38 is welded between the inner ring frame 37 and the outer ring frame 39. A fixed support 40 is welded to the inner ring frame 37 and the outer ring frame 39. A movable support rod 42 is installed inside the fixed support 40. A self-rotating handle 41 is installed at one end of the fixed support 40. An enlarged end 43 is installed at one end of the movable support rod 42. The enlarged end 43 supports the steel ring frame 45. A movable bracket 46 is welded to the bottom of the outer ring frame 39. A fixing screw 44 is installed on the movable bracket 46.

Claims

1. A shallow-cover, ultra-large-diameter, ultra-long curved pipe jacking construction structure, characterized in that: It includes a long-distance pipe jacking and sludge removal system, a shallow-covered movable counterweight structure, a shallow-covered grouting system, a curve pre-adjustment device, and a mobile support frame; The long-distance pipe jacking sludge removal system includes pipe jacking sections (16) and counterweight guide rails (28); a counterweight water tank (24) is installed on the counterweight guide rails (28), and the counterweight water tanks (24) are connected to multi-stage sedimentation tanks (26). The shallow overburden grouting system includes a grouting ring pipe (19) and grouting holes (18) at the joint of the jacking pipe section (16). The shallow-covered movable counterweight structure includes a counterweight frame (10), which moves at the bottom of the jacking pipe section (16). A water supply pipe (11) is installed at the bottom of the counterweight frame (10). In the shallow-covered movable counterweight structure, grouting pipes (2), ventilation pipes (1) and ventilation ducts (15) are respectively installed on both sides of the jacking pipe section (16) through angle steel brackets (5). A positioning groove (3) is provided on the angle steel bracket (5), and one end of a screw (6) is inserted into the positioning groove (3). The other end is connected to a sleeve (4), which is embedded in the inside of the pipe section (16) on both sides. A ring plate (14) is provided at the bottom of the pipe section (16), a channel steel frame (13) is provided on the ring plate (14), an anti-slip walkway plate (7) is laid on the channel steel frame (13), a guide rail (9) is provided on the channel steel frame (13), a counterweight frame (10) is connected to the guide rail (9), a baffle plate (8) is provided on both sides of the counterweight frame (10), and a water supply pipe (11) is provided at the bottom of the counterweight frame (10). The curve pre-adjustment device includes a locking steel plate (31) and a jack (34). The locking steel plate (31) and the jack (34) are provided at the tongue and groove of the jacking pipe section (16). The locking steel plate (31) is provided at the tongue and groove of the jacking pipe section (16). A grouting steel pipe (32) is welded under the locking steel plate (31). Water-swellable rubber strips (33) are pre-embedded between the jacking pipe sections (16). A cylinder groove (47) is pre-set at the tongue and groove of the jacking pipe section (16). A jack (34) is provided in the cylinder groove (47). A pine board (30) is provided in front of the jack (34). An ear plate (29) and a connecting vertical plate (36) are provided at the bottom of the interface of the jacking pipe section (16). The connecting vertical plates (36) are fixed together with bolts (35). The movable support frame includes an inner ring frame (37), an outer ring frame (39), and a steel ring frame (45). Fixed supports (40) are welded on the inner ring frame (37) and the outer ring frame (39). One end of the fixed support (40) is equipped with a self-rotating handle (41), and the other end supports the steel ring frame (45) through a movable support rod (42). A movable bracket (46) is welded to the bottom of the outer ring frame (39).

2. The shallow-cover, ultra-large-diameter, ultra-long curved pipe jacking construction structure according to claim 1, characterized in that: In the long-distance pipe jacking and sludge removal system, the pipe sections (16) are connected by ring plates (14). A counterweight guide rail (28) is set behind the pipe jacking machine (23). A guide rail frame (12) is set on the counterweight guide rail (28). A counterweight water tank (24) is set on the guide rail frame (12). The counterweight water tank (24) is connected to a multi-stage sedimentation tank (26) through a water conveying pipe (11). A water pump (25) is equipped on the water conveying pipe (11). A water storage tank (27) is set outside the caisson.

3. The shallow-cover, ultra-large-diameter, ultra-long curved pipe jacking construction structure according to claim 1, characterized in that: In the shallow overburden grouting system, a grouting hole (18) is provided at the joint of the jacking pipe section (16). The grouting hole (18) is connected to a grouting ring pipe (19). The grouting ring pipe (19) is connected to a main pipe (17). A grouting check valve (22) is provided in the grouting hole (18). The grouting check valve (22) is connected to a pressure-resistant rubber valve (20). The pressure-resistant rubber valve (20) is connected to a tee (21).

4. The shallow-cover, ultra-large-diameter, ultra-long curved pipe jacking construction structure according to claim 1, characterized in that: In the movable support frame, a connecting rib (38) is welded between the inner ring frame (37) and the outer ring frame (39). A fixed support (40) is welded on the inner ring frame (37) and the outer ring frame (39). A movable support rod (42) is sleeved on the fixed support (40). A self-rotating handle (41) is provided at one end of the fixed support (40). An enlarged end (43) is provided at one end of the movable support rod (42). The enlarged end (43) supports the inner side of the steel ring frame (45). A movable bracket (46) is welded to the bottom of the outer ring frame (39). A fixing screw (44) is provided on the movable bracket (46).

5. The construction method for a shallow-cover, ultra-large-diameter, ultra-long curved pipe jacking structure as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Mud construction in shallow overburden section; construction of long-distance pipe jacking and mud removal system. During the pipe jacking process, thixotropic mud is injected into the outer wall of the pipe. The pipe jacking machine (23) is equipped with three pipe sections (16) with grouting holes (18). After that, one pipe section (16) with grouting holes (18) is set in every three sections. The grouting holes (18) are connected to the main pipe (17) by grouting ring pipe (19). S2, counterweight construction in shallow overburden section; when the jacking area of ​​the pipe jacking machine (23) is located in the shallow overburden section, grouting pipe (2), ventilation pipe (1) and ventilation duct (15) are respectively installed on both sides of the pipe section (16). S3, Curved section pipe jacking adjustment construction; A curve pre-adjustment device is set between three consecutive pipe jacking sections (16) after the pipe jacking machine (23). The jacks (34) form an opening gap between the pipe jacking sections (16) so that the pipe jacking sections (16) can advance according to the design curve. S4. Construction at the joint of the underwater pipe section; when the gap of the jacking pipe section (16) is underwater and the gap leaks, a mobile support frame (45) is used to support the steel ring frame.

6. The construction method for the shallow-cover, ultra-large-diameter, ultra-long curved pipe jacking structure according to claim 5, characterized in that, In step S1: Each jacking pipe section (16) is provided with 6 grouting holes (18), and each grouting hole (18) is provided with a grouting check valve (22) for individual control; the grouting check valve (22) is connected to the pressure-resistant rubber valve (20), and the pressure-resistant rubber valve (20) is connected to the tee (21).

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