Pipe roofing construction process

Abstract

The invention discloses a pipe roofing construction process. The pipe roofing construction process comprises the following steps of construction preparation; excavating a starting well and a receiving well, wherein the starting well and the receiving well are located at the two ends of the tunnel; a pipe jacking platform is erected in the starting well, and the pipe jacking position is determined; pipe jacking operation is conducted in sequence, and the adjacent pipe fittings are connected to form a pipe curtain; the space below the pipe roofing is excavated, interval supporting is conducted along with the excavation process through a supporting assembly in the excavation operation till excavation is through, and the supporting assembly is of an integrated telescopic structure; primary reinforcement is conducted between the spaced supports; after primary reinforcement and consolidation, the support is removed, and secondary reinforcement is conducted on the original support position; and pouring the bottom plate. The interior of the tunnel excavated below the pipe roofing is supported through the supporting assembly, the pipe roofing is temporarily supported through the supporting assembly of the integrated telescopic structure, follow-up permanent curing is facilitated, the problem that an extra measure is needed for making up errors between a prefabricated I-shaped steel framework and the tunnel excavated on site is solved, and time and labor are saved.

Description

Technical Field

[0001] The invention relates to the technical field of pipe curtain support, in particular to a pipe curtain construction process. Background Art

[0002] With the increasing utilization of urban space, pipe curtain technology has been increasingly used, enabling construction without affecting existing ground facilities, greatly reducing the impact of construction on people’s production and life, and has great application potential.

[0003] The Nansha Pearl Bay Cross-River Channel Project (Phase II) starts from Huanshi Avenue in the north. The cross-river tunnel passes through the Jiaomen Waterway and connects with the Phase I section at Jiangling South Road in the south. The total length of the road is 3.13km. It passes through the mangrove wetlands at the Jiaomenjiao River estuary. In order to protect the mangrove wetlands, it is necessary to carry out pipe curtain construction under the mangroves.

[0004] During the pipe curtain construction process, the pipe curtain needs to be temporarily supported and then reinforced. The existing temporary support is spliced ​​with I-beam structures. Although it can achieve the purpose of support, the splicing of I-beam structures requires additional measures to compensate for the error between the prefabricated I-beam structures and the tunnel excavated on site, which is time-consuming and labor-intensive. Summary of the invention

[0005] The invention provides a pipe curtain construction process to solve the problems raised in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A pipe curtain construction process comprises the following steps:

[0008] S1: Construction preparation;

[0009] S2: excavating a starting well and a receiving well, the starting well and the receiving well being located at both ends of the tunnel;

[0010] S3: Set up a pipe jacking platform in the launch well and determine the pipe jacking position;

[0011] S4: Pipe jacking is carried out sequentially, and adjacent pipes are connected to each other to form a pipe curtain;

[0012] S5: hollowing out the space below the pipe curtain, and during the hollowing out operation, providing interval support by using a support assembly accompanying the excavation process until the excavation is completed, wherein the support assembly is an integrated telescopic structure;

[0013] S6: Carry out reinforcement between the support intervals;

[0014] S7: After the primary reinforcement is completed, the support is removed and secondary reinforcement is carried out at the original support location;

[0015] S8: Casting the base plate.

[0016] Preferably, in step S1, the construction preparation includes conducting a detailed geological survey of the construction site and formulating a corresponding construction plan.

[0017] Preferably, in step S4, the pipe jacking operation includes the following steps:

[0018] S41: Pre-reinforcement of the tunnel bottom, using all-round high-pressure jet grouting technology to reinforce the constructed lower pipe curtain;

[0019] S42: Mud and water balance pipe jacking, the mud and water adjusted to a certain concentration and specific gravity are delivered to the excavation surface in front of the pipe jacking machine head through the mud and water delivery system;

[0020] S43: Grouting water stop on the side wall. Grouting holes are reserved between the side wall pipe curtains. After the construction of two adjacent sections of the pipe curtain is completed, grouting water stop on the side wall is carried out. Cement-water glass double liquid grouting material is used to completely seal the space between the side wall gaps to achieve the water stop effect.

[0021] S44: The pipe is filled with concrete. C40 slightly expansive fine stone concrete is used for grouting inside the pipe. Grouting is carried out from one end, and the slurry outlet is set at the top of the steel pipe at the other end. When the slurry flows out of the slurry outlet, the valve is closed and the pressure is increased to 0.8MPa. When the slurry is initially solidified and no longer flows, the curtain pipe outlet is closed for secondary grouting. Plain cement slurry can be used for grouting.

[0022] Preferably, in step S4, adjacent pipe fittings are connected to each other via a clamping assembly, the clamping assembly comprising a clamping rib and a clamping block, the clamping rib and the clamping block are arranged between adjacent pipe fittings, the clamping rib and the clamping block are fixedly connected to the pipe curtain body, and the clamping rib is clamped in the clamping block.

[0023] Preferably, the clamping block is fixedly connected to the fixing block, and the fixing block is fixedly connected to the tube curtain body;

[0024] A clamping groove is arranged in the clamping block, a plurality of balls are arranged in the clamping groove, the balls are in contact with the clamping ribs, a shift bar is arranged outside the balls, shift fixing plates are arranged at both ends of the clamping ribs, and the shift fixing plates are fixedly connected to the clamping block.

[0025] Preferably, in step S5, the space below the pipe curtain is supported by a support assembly, wherein the support assembly comprises a support base plate, a support column is arranged on the support base plate, the support column can be extended, a driving telescopic rod is arranged on the outer side of the support column, a support frame group is connected to the top of the support column, the support frame group is connected to the driving telescopic rod, and the support frame group is rotatably connected to a connecting protruding rod arranged on the top of the support column;

[0026] The support frame groups are symmetrically arranged on both sides of the support column.

[0027] Preferably, the support frame group includes a plurality of support frames, and the plurality of support frames are rotatably connected to each other;

[0028] The support frame includes two groups of support frame units arranged side by side, and the two adjacent groups of support frame units are connected by a first connecting column and a second connecting column.

[0029] Preferably, the support frame unit includes a first support frame rod, a second support frame rod, a third support frame rod, and a fourth support frame rod, one end of the first support frame rod is rotatably connected to the connecting protruding rod, the other end of the first support frame rod is rotatably connected to one end of the fourth support frame rod, one end of the second support frame rod is rotatably connected to the driving telescopic rod, the other end of the second support frame rod is rotatably connected to one end of the third support frame rod, the other end of the third support frame rod is rotatably connected to the second support frame rod of the next-level support frame unit, and the other end of the fourth support frame rod is rotatably connected to the first support frame rod of the next-level support frame unit;

[0030] The third support frame rod and the fourth support frame rod are rotatably connected at the middle section.

[0031] Preferably, the middle section of the second support frame rod is rotatably connected to one end of the first connecting column, and the other end of the first connecting column is rotatably connected to the second support frame rod of the side support frame unit;

[0032] The first support frame rod is provided with a slide groove;

[0033] The first connecting column is slidably connected in the sliding groove;

[0034] One end of the second linkage rod is rotatably connected to the first connection column, the other end of the second linkage rod is rotatably connected to one end of the first linkage rod, and the other end of the first linkage rod is rotatably connected to the middle of the upper section of the fourth support frame rod.

[0035] Preferably, a portion of the first connecting column located in the slide slot is provided with a groove, and the groove provided on the first connecting column is adapted to the protrusion provided in the slide slot;

[0036] A convex block is provided at the connection between the first connecting column and the second linkage rod, and a boss is provided at the connection between the second linkage rod and the first connecting column. The convex block provided on the first connecting column is adapted to the boss of the second linkage rod.

[0037] Compared with the prior art, the present invention has at least the following beneficial effects:

[0038] The present application uses a support assembly to support the tunnel excavated under the pipe curtain, and uses a support assembly with an integrated telescopic structure to temporarily support the pipe curtain, which is convenient for subsequent permanent solidification. Compared with the existing support structure spliced ​​by I-beam structures, it solves the problem that the prefabricated I-beam structure needs additional measures to compensate for the error between the tunnel excavated on site, saving time and effort;

[0039] The method of first reinforcing between support components and then removing the support for secondary reinforcement can not only meet the safety requirements of construction, but also shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a flow chart of the steps of the present invention;

[0041] Figure 2 This is a schematic diagram of the unreinforced state of the lower side of the pipe roof of the present invention;

[0042] Figure 3 It is a schematic diagram of the reinforcement state of the lower side of the pipe curtain of the present invention;

[0043] Figure 4 It is a schematic diagram of the structure of the clamping assembly of the present invention;

[0044] Figure 5 It is a schematic diagram of the supporting state of the supporting assembly of the present invention;

[0045] Figure 6 It is a schematic diagram of the structure of the support frame group of the present invention;

[0046] Figure 7 It is a schematic diagram of the support frame structure of the present invention;

[0047] Figure 8 It is a schematic diagram of the support frame unit structure of the present invention;

[0048] Fig. 9 It is a partial structural schematic diagram of a support frame unit of the present invention;

[0049] Fig.10 It is another partial structural schematic diagram of the support frame unit of the present invention.

[0050] In the figure: 1. pipe curtain body; 2. clamping assembly; 4. fixing block; 5. clamping block; 6. clamping groove; 7. gear fixing plate; 8. gear bar; 9. support bottom plate; 10. support column; 11. driving telescopic rod; 12. connecting convex rod; 13. support frame group; 14. support frame; 15. support frame unit; 16. first connecting column; 17. second connecting column; 18. first support frame rod; 19. second support frame rod; 20. third support frame rod; 21. fourth support frame rod; 22. first linkage rod; 23. second linkage rod; 24. slide groove. DETAILED DESCRIPTION

[0051] In the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish the protective components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] Example 1

[0053] See also Figure 1-3 , an embodiment provided by the present invention: a pipe curtain construction process, comprising the following steps:

[0054] S1: Construction preparation;

[0055] S2: excavating a starting well and a receiving well, the starting well and the receiving well being located at both ends of the tunnel;

[0056] S3: Set up a pipe jacking platform in the launch well and determine the pipe jacking position;

[0057] S4: Pipe jacking is carried out sequentially, and adjacent pipes are connected to each other to form a pipe curtain;

[0058] S5: hollowing out the space below the pipe curtain, and during the hollowing out operation, providing interval support by using a support assembly accompanying the excavation process until the excavation is completed, wherein the support assembly is an integrated telescopic structure;

[0059] S6: Carry out reinforcement between the support intervals;

[0060] S7: After the primary reinforcement is completed, the support is removed and secondary reinforcement is carried out at the original support location;

[0061] S8: Casting the base plate.

[0062] In step S1, the construction preparation includes conducting a detailed geological survey of the construction site and formulating a corresponding construction plan.

[0063] In step S4, the pipe jacking operation includes the following steps:

[0064] S41: Pre-reinforcement of the tunnel bottom, using all-round high-pressure jet grouting technology to reinforce the constructed lower pipe curtain;

[0065] The all-round high-pressure jet spraying technology is a water-stopping reinforcement method that is suitable for narrow spaces, large torque, and all-round swing spraying construction. Through the unique porous tube and front-end device of the equipment, the surrounding soil is cut and destroyed by high-pressure jets, and the hardened material slurry is pressurized and transported, sprayed, cut the formation, mixed, drained, and concentrated. From slurry making and spraying to subsequent slurry drainage and mud and water treatment, an engineering construction chain is formed. Auxiliary flow and pressure data acquisition modules are used to realize the controllable construction process;

[0066] S42: Mud and water balance pipe jacking, the mud and water adjusted to a certain concentration and specific gravity are delivered to the excavation surface in front of the pipe jacking machine head through the mud and water delivery system;

[0067] The basic principle of mud-water balanced pipe jacking technology is to send mud-water with a certain concentration and specific gravity to the excavation surface in front of the pipe jacking machine head through the mud-water delivery system. The mud-water forms an impermeable mud film on the excavation surface to prevent the mud-water from penetrating into the excavation surface. At the same time, the mud-water pressure is adjusted to balance the groundwater pressure and soil pressure to achieve the purpose of stabilizing the excavation surface. When the pipe jacking machine head moves forward, the cutterhead cuts the soil. After the cut residual soil is fully mixed with the mud-water, it is transported to the ground mud-water separation equipment for treatment by the mud discharge system. The separated residual soil is transported away, and the mud-water is sent to the water delivery system for recycling. The pipe jacking accuracy is ≤50mm.

[0068] S43: Grouting water stop on the side wall. Grouting holes are reserved between the side wall pipe curtains. After the construction of two adjacent sections of the pipe curtain is completed, grouting water stop on the side wall is carried out. Cement-water glass double liquid grouting material is used to completely seal the space between the side wall gaps to achieve the water stop effect.

[0069] S44: The pipe is filled with concrete. C40 slightly expansive fine stone concrete is used for grouting inside the pipe. Grouting is carried out from one end, and the slurry outlet is set at the top of the steel pipe at the other end. When the slurry flows out of the slurry outlet, the valve is closed and the pressure is increased to 0.8MPa. When the slurry is initially solidified and no longer flows, the curtain pipe outlet is closed for secondary grouting. Plain cement slurry can be used for grouting.

[0070] The working principle and beneficial effects of the above scheme:

[0071] The present application uses a support assembly to support the tunnel excavated under the pipe curtain, and uses a support assembly with an integrated telescopic structure to temporarily support the pipe curtain, which is convenient for subsequent permanent solidification. Compared with the existing support structure spliced ​​by I-beam structures, it solves the problem that the prefabricated I-beam structure needs additional measures to compensate for the error between the tunnel excavated on site, saving time and effort;

[0072] The method of first reinforcing between support components and then removing the support for secondary reinforcement can not only meet the safety requirements of construction, but also shorten the construction period.

[0073] Example 2

[0074] Reference Figure 2-4 On the basis of Example 1, in step S4, adjacent pipe fittings are connected to each other through a clamping assembly 2, and the clamping assembly includes a clamping rib and a clamping block 5, and the clamping rib and the clamping block 5 are arranged between adjacent pipe fittings, and the clamping rib and the clamping block 5 are fixedly connected to the pipe curtain body 1, and the clamping rib is clamped in the clamping block 5.

[0075] The clamping block 5 is fixedly connected to the fixing block 4, and the fixing block 4 is fixedly connected to the tube curtain body 1;

[0076] A clamping groove 6 is provided in the clamping block 5, and a plurality of balls are provided in the clamping groove 6. The balls are in contact with the clamping ribs. A shift bar 8 is provided on the outer side of the balls. Shift fixing plates 7 are provided at both ends of the clamping ribs. The shift fixing plates 7 are fixedly connected to the clamping block 5.

[0077] The working principle and beneficial effects of the above scheme:

[0078] Adjacent tube curtain bodies 1 are connected by the clamping assembly 2, thereby ensuring the consistency between the tube curtain bodies 1 and improving the strength of the tube curtain;

[0079] When adjacent tube curtain bodies 1 are connected, the clamping edge strips on one of the tube curtain bodies 1 are inserted into the clamping groove 6 of the clamping block 5 to complete the connection between the two. During the insertion process, the ball rolling connection between the clamping edge strip and the clamping groove 6 and the shifting strip 8 is more labor-saving and smoother than the sliding friction hybrid friction.

[0080] The shift bar 8 is used to prevent the balls from falling off.

[0081] Example 3

[0082] Reference Figure 5-10 On the basis of Embodiment 1-2, in step S5, the space below the pipe curtain is supported by a support assembly, the support assembly includes a support base plate 9, a support column 10 is arranged on the support base plate 9, the support column 10 is telescopic, a driving telescopic rod 11 is arranged on the outer side of the support column 10, a support frame group 13 is connected to the top of the support column 10, the support frame group 13 is connected to the driving telescopic rod 11, and the support frame group 13 is rotatably connected to the connecting protruding rod 12 arranged on the top of the support column 10;

[0083] The support frame set 13 is symmetrically arranged on both sides of the support column 10 .

[0084] The support frame group 13 includes a plurality of support frames 14, and the plurality of support frames 14 are rotatably connected to each other;

[0085] The support frame 14 includes two groups of support frame units 15 arranged side by side, and two adjacent groups of support frame units 15 are connected by a first connecting column 16 and a second connecting column 17 .

[0086] The support frame unit 15 includes a first support frame rod 18, a second support frame rod 19, a third support frame rod 20, and a fourth support frame rod 21, wherein one end of the first support frame rod 18 is rotatably connected to the connecting protruding rod 12, the other end of the first support frame rod 18 is rotatably connected to one end of the fourth support frame rod 21, one end of the second support frame rod 19 is rotatably connected to the driving telescopic rod 11, the other end of the second support frame rod 19 is rotatably connected to one end of the third support frame rod 20, the other end of the third support frame rod 20 is rotatably connected to the second support frame rod 19 of the next-level support frame unit 15, and the other end of the fourth support frame rod 21 is rotatably connected to the first support frame rod 18 of the next-level support frame unit 15;

[0087] The third support frame rod 20 and the fourth support frame rod 21 are rotatably connected at the middle section.

[0088] The middle section of the second support frame rod 19 is rotatably connected to one end of the first connection column 16, and the other end of the first connection column 16 is rotatably connected to the second support frame rod 19 of the side support frame unit 15;

[0089] The first support frame rod 18 is provided with a slide groove 24;

[0090] The first connecting column 16 is slidably connected in the sliding groove 24;

[0091] One end of the second linkage rod 23 is rotatably connected to the first connection column 16 , the other end of the second linkage rod 23 is rotatably connected to one end of the first linkage rod 22 , and the other end of the first linkage rod 22 is rotatably connected to the middle of the upper section of the fourth support frame rod 21 .

[0092] The portion of the first connecting column 16 located in the slide slot 24 is provided with a groove, and the groove provided on the first connecting column 16 is adapted to the protrusion provided in the slide slot 24;

[0093] A protrusion is provided at the connection between the first connecting column 16 and the second linkage rod 23 , and a boss is provided at the connection between the second linkage rod 23 and the first connecting column 16 . The protrusion provided on the first connecting column 16 is adapted to the boss of the second linkage rod 23 .

[0094] The working principle and beneficial effects of the above scheme:

[0095] When temporarily supporting the space under the pipe curtain, it is only necessary to place the support assembly under the support area, extend the support column 10 so that the upper end of the support column 10 abuts against the lower side of the pipe curtain, and then extend the telescopic rod 11 to drive the support frame group 13 to expand, so as to support the lower part of the pipe curtain;

[0096] When the support frame assembly 13 is unfolded, the groove of the first connecting column 16 in the slide groove 24 interferes with the protrusion provided in the slide groove 24, and the first connecting column 16 cannot slide in the slide groove 24, but can only rotate in the slide groove 24, and the support frame assembly 13 extends. When the first connecting column 16 rotates through a certain angle in the slide groove 24, the protrusion provided in the slide groove 24 cannot restrict the first connecting column 16, and the first connecting column 16 slides in the slide groove 24, causing the support frame assembly 13 to bend, forming a shape as shown in the figure. Figure 5 The state shown completes the support of the pipe curtain;

[0097] When one reinforcement is completed, the support column 10 and the driving telescopic rod 11 are retracted, and the support frame group 13 is folded to reduce the volume for easy transportation.

[0098] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A pipe curtain construction process, characterized in that: The following steps are involved: S1: Construction preparation; S2: excavating a starting well and a receiving well, the starting well and the receiving well being located at both ends of the tunnel; S3: Set up a pipe jacking platform in the launch well and determine the pipe jacking position; S4: Pipe jacking is carried out sequentially, and adjacent pipes are connected to each other to form a pipe curtain; S5: hollowing out the space below the pipe curtain, and during the hollowing out operation, providing interval support by using a support assembly accompanying the excavation process until the excavation is completed, wherein the support assembly is an integrated telescopic structure; S6: Carry out reinforcement between the support intervals; S7: After the primary reinforcement is completed, the support is removed and secondary reinforcement is carried out at the original support location; S8: Casting the base plate.

2. A pipe-roof construction process according to claim 1, characterized in that: In step S1, the construction preparation includes conducting a detailed geological survey of the construction site and formulating a corresponding construction plan.

3. A pipe-roof construction process according to claim 1, characterized in that: In step S4, the pipe jacking operation includes the following steps: S41: Pre-reinforcement of the tunnel bottom, using all-round high-pressure jet grouting technology to reinforce the constructed lower pipe curtain; S42: Mud and water balance pipe jacking, the mud and water adjusted to a certain concentration and specific gravity are delivered to the excavation surface in front of the pipe jacking machine head through the mud and water delivery system; S43: Grouting water stop on the side wall. Grouting holes are reserved between the side wall pipe curtains. After the construction of two adjacent sections of the pipe curtain is completed, grouting water stop on the side wall is carried out. Cement-water glass double liquid grouting material is used to completely seal the space between the side wall gaps to achieve the water stop effect. S44: The pipe is filled with concrete. C40 slightly expansive fine stone concrete is used for grouting inside the pipe. Grouting is carried out from one end, and the slurry outlet is set at the top of the steel pipe at the other end. When the slurry flows out of the slurry outlet, the valve is closed and the pressure is increased to 0.8MPa. When the slurry is initially solidified and no longer flows, the curtain pipe outlet is closed for secondary grouting. Plain cement slurry can be used for grouting.

4. A pipe-roof construction process according to claim 1, characterized in that: In step S4, adjacent pipe fittings are connected to each other via a clamping assembly (2), wherein the clamping assembly comprises a clamping rib and a clamping block (5), wherein the clamping rib and the clamping block (5) are arranged between adjacent pipe fittings, wherein the clamping rib and the clamping block (5) are fixedly connected to the pipe curtain body (1), and wherein the clamping rib is clamped in the clamping block (5).

5. A pipe-roof construction process according to claim 4, characterized in that: The clamping block (5) is fixedly connected to the fixing block (4), and the fixing block (4) is fixedly connected to the tube curtain body (1); A clamping groove (6) is provided in the clamping block (5), a plurality of balls are provided in the clamping groove (6), the balls are in contact with the clamping ribs, a shift bar (8) is provided outside the balls, shift fixing plates (7) are provided at both ends of the clamping ribs, and the shift fixing plates (7) are fixedly connected to the clamping block (5).

6. A pipe-roof construction process according to claim 1, characterized in that: In step S5, the space below the pipe curtain is supported by a support assembly, wherein the support assembly comprises a support base plate (9), a support column (10) is arranged on the support base plate (9), the support column (10) is capable of being telescopic, a driving telescopic rod (11) is arranged on the outside of the support column (10), a support frame group (13) is connected to the top end of the support column (10), the support frame group (13) is connected to the driving telescopic rod (11), and the support frame group (13) is rotatably connected to a connecting protruding rod (12) arranged on the top end of the support column (10); The support frame group (13) is symmetrically arranged on both sides of the support column (10).

7. A pipe-roof construction process according to claim 6, characterized in that: The support frame group (13) comprises a plurality of support frames (14), and the plurality of support frames (14) are rotatably connected to each other; The support frame (14) comprises two groups of support frame units (15) arranged side by side, and the two adjacent groups of support frame units (15) are connected via a first connecting column (16) and a second connecting column (17).

8. A pipe-roof construction process according to claim 7, characterized in that: The support frame unit (15) comprises a first support frame rod (18), a second support frame rod (19), a third support frame rod (20), and a fourth support frame rod (21); one end of the first support frame rod (18) is rotatably connected to the connecting protruding rod (12); the other end of the first support frame rod (18) is rotatably connected to one end of the fourth support frame rod (21); one end of the second support frame rod (19) is rotatably connected to the driving telescopic rod (11); the other end of the second support frame rod (19) is rotatably connected to one end of the third support frame rod (20); the other end of the third support frame rod (20) is rotatably connected to the second support frame rod (19) of the next-level support frame unit (15); and the other end of the fourth support frame rod (21) is rotatably connected to the first support frame rod (18) of the next-level support frame unit (15); The third supporting frame rod (20) and the fourth supporting frame rod (21) are rotatably connected at the middle sections.

9. A pipe-roof construction process according to claim 8, characterized in that: The middle section of the second support frame rod (19) is rotatably connected to one end of the first connection column (16), and the other end of the first connection column (16) is rotatably connected to the second support frame rod (19) of the side support frame unit (15); The first support frame rod (18) is provided with a slide groove (24); The first connecting column (16) is slidably connected in the sliding groove (24); One end of a second linkage rod (23) is rotatably connected to the first connection column (16), the other end of the second linkage rod (23) is rotatably connected to one end of the first linkage rod (22), and the other end of the first linkage rod (22) is rotatably connected to the middle of the upper section of the fourth support frame rod (21).

10. A pipe-roof construction process according to claim 9, characterized in that: The portion of the first connecting column (16) located in the slide groove (24) is provided with a groove, and the groove provided on the first connecting column (16) is adapted to the protrusion provided in the slide groove (24); A convex block is provided at the connection between the first connecting column (16) and the second linkage rod (23), and a boss is provided at the connection between the second linkage rod (23) and the first connecting column (16). The convex block provided on the first connecting column (16) is adapted to the boss of the second linkage rod (23).

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