Stress-testable spiral unearthing pipe curtain structure and testing method

Abstract

The present application relates to the technical field of tunnel engineering pipe curtain support, in particular to a spiral unearthing pipe curtain structure capable of stress testing and a testing method, two groups of male and female buckles are respectively arranged on the upper and lower sides of two steel pipe curtains, and are connected through the male and female buckles, a gap is formed between the two groups of male and female buckles, a pipe joint stress testing device is arranged in the gap, the pipe joint stress testing device is effectively protected, stress testing of the steel pipe curtain not yet jacked into the soil body is facilitated, the pipe joint stress testing device changes due to different pipe-soil frictional resistance during the process of jacking the steel pipe curtain into the soil body, and the change data is transmitted to an automatic acquisition system through a data transmission cable, stress data of the steel pipe curtain not yet jacked into the soil body during the process of jacking into the soil body is effectively acquired, and the difficulty of pipe joint stress testing during the jacking construction process of the spiral unearthing steel pipe curtain is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel engineering pipe curtain support, in particular to a spiral unearthing pipe curtain structure capable of stress testing and a testing method. BACKGROUND

[0002] The rapid development of cities leads to an increasing scale of buildings and population, resulting in a series of "urban problems" such as crowded building space, traffic jam, and backward infrastructure. The underground space of a city greatly expands the living space of human beings due to its significant land-saving property, and is widely developed and utilized in the sustainable development of a city. However, with the increasingly complex structure of underground engineering and the gradually reduced distance between the underground engineering and surrounding existing structures, the traditional open excavation method is no longer suitable for densely populated and land-constrained urban center areas because it brings about adverse effects such as municipal pipeline relocation, surrounding traffic, dust and noise pollution, and destruction of green landscape during the construction of underground space. The pipe curtain method, as a new type of underground crossing method, can construct large-span and large-section underground engineering on the basis of small-diameter pipe curtain, and can effectively control the ground deformation, so it is widely used in urban areas with dense buildings and busy traffic and shallow-buried large-section underground engineering.

[0003] The spiral unearthing pipe curtain construction refers to "hydraulic jacking of steel pipe and spiral unearthing in the pipe", that is, the pipe curtain steel pipe is used as a casing pipe, a spiral drill rod with a special drill bit is installed inside the casing pipe, and the pipe curtain equipment provides the rotation power of the spiral drill rod and the jacking force of the casing pipe. When the pipe curtain steel pipe is jacked, the spiral drill rod transmits the drilling pressure and torque to the drill bit to cut the soil layer, and the drill cuttings are spirally discharged from the inside of the pipe to the outside of the pipe at the hole opening, so that the pipe curtain steel pipe is jacked forward section by section to the end of the construction of the construction unit. After the subsequent unit construction is repeatedly performed, the pipe curtain structure is gradually formed outside the excavation line.

[0004] During the pipe jacking construction of the spiral unearthing pipe curtain, the pipe joint is in a complex and variable force system, and it is subjected to axial jacking force, head-on resistance, pipe-soil friction resistance, self-weight, and possibly existing ground traffic load. Moreover, the jacking of the steel pipe curtain is a cyclic process, and the pipe joint is constantly loaded and unloaded during the entire process. In addition, compared with the ordinary reinforced concrete pipe jacking, the pipe joint of the steel pipe curtain is a thin-walled structure with good deformation performance and poor stability, which further aggravates the complexity of the stress. If the actual stress characteristics of the pipe joint during the jacking of the steel pipe curtain are not correctly mastered, the overall stability of the pipe curtain structure will be seriously affected.

[0005] Among them, the existing technology has the following problems:

[0006] ①Unlike the stress testing of pipe joints of large-diameter shield pipe jacking, steel pipe jacking after pre-excavation, and the like, there are few reports on the stress testing method of pipe joints of small-diameter steel pipe jacking of the spiral unearthing type;

[0007] ②Because the pipe spiral is out of the soil, the inner side of the pipe curtain is in the state of cutting and slagging during the jacking process, so it is impossible to install the pipe joint stress testing device on the inner side of the pipe curtain;

[0008] ③Because the pipe curtain is in contact with the soil during the jacking process, if the pipe joint stress testing device is installed on the outer side of the pipe curtain, the testing device and the connecting cable are easily damaged.

[0009] ④Because the pipe curtain is in the state of "invisible" in the soil, when the jacking force suddenly increases and the jacking line deviates during the jacking construction process of the small-diameter steel pipe curtain with spiral out of the soil, it is impossible to solve the problem in the first time by adjusting the jacking force and posture.

[0010] ⑤The existing mechanical research on the jacking construction process of the small-diameter steel pipe curtain with spiral out of the soil mainly relies on formula derivation and numerical simulation analysis, and there is a serious lack of pipe joint stress measurement data of this type of pipe curtain, whether the research results are correct needs further comparison and verification. SUMMARY

[0011] In order to overcome the defects of the prior art, the purpose of the present application is to provide a stress testable spiral out of the soil pipe curtain structure and a testing method, to solve the difficulty of pipe joint stress testing in the jacking construction process of the existing spiral out of the soil steel pipe curtain, and to further affect the technical problems of the site construction and theoretical research of this type of pipe curtain.

[0012] The present application is realized by the following technical solutions:

[0013] A stress testable spiral out of the soil pipe curtain structure, comprising a first steel pipe curtain, a second steel pipe curtain, a pipe joint stress testing device and a stress automatic acquisition system; the upper and lower ends of one side of the first steel pipe curtain are respectively provided with female buckles along the long edge direction of the pipe body; the upper and lower ends of one side of the second steel pipe curtain are respectively provided with male buckles along the long edge direction of the pipe body, the first steel pipe curtain is respectively connected with the two groups of male buckles on the second steel pipe curtain through the two groups of female buckles, and a gap is formed between the upper and lower groups of female and male buckles, the pipe joint stress testing device is assembled on the first steel pipe curtain or the second steel pipe curtain in the gap, and the stress automatic acquisition system is connected with the pipe joint stress testing device through a data transmission cable; wherein, when the pipe joint stress testing device is assembled on the second steel pipe curtain, the first steel pipe curtain is a steel pipe curtain that has been jacked into the soil, and the second steel pipe curtain is a steel pipe curtain that has not been jacked into the soil; when the pipe joint stress testing device is assembled on the first steel pipe curtain, the second steel pipe curtain is a steel pipe curtain that has been jacked into the soil, and the first steel pipe curtain is a steel pipe curtain that has not been jacked into the soil.

[0014] Preferably, the pipe joint stress testing device comprises a wire outlet box, two groups of metal fixing components and a test pipe.

[0015] The outlet box is assembled on the test pipe, two ends of the test pipe are respectively fixed and assembled on the first steel pipe curtain or the second steel pipe curtain through two groups of metal fixing assemblies, the test pipe is provided with a vibrating string, two ends of the vibrating string are respectively connected to the two groups of metal fixing assemblies, and the stress automatic acquisition system is connected to the vibrating string through the data transmission cable through the outlet box.

[0016] Further, the data transmission cable is fixed on the first steel pipe curtain or the second steel pipe curtain through a plurality of metal cable buckles along the long edge direction of the pipe body.

[0017] Further, two ends of the vibrating string are pulled tight to a tight structure through the two groups of metal fixing assemblies.

[0018] Further, the metal fixing assembly comprises a metal connecting block, a metal fixing base, a column head screw and a fixing bolt; the metal fixing base comprises a base and an upper cover, the metal connecting block is placed on the base, and the upper cover is pressed on the metal connecting block, wherein one side of the upper cover is fixed on the base through the fixing bolt, and the other side is fixed on the base through the column head screw, wherein a spring pad is arranged between the column head screw and the upper cover; two sides of the base are respectively welded on the pipe wall of the first steel pipe curtain or the second steel pipe curtain, and two ends of the vibrating string are respectively connected to the metal connecting block.

[0019] Preferably, the pipe joint stress test equipment is externally provided with a soil retaining box.

[0020] Preferably, the male buckle and the female buckle are both L-shaped metal plate structures.

[0021] A test method of a stress-testable spiral unearthing pipe curtain structure, based on the above-mentioned stress-testable spiral unearthing pipe curtain structure, comprises the following processes:

[0022] When the first steel pipe curtain is a steel pipe curtain that has been jacked into the soil body, and the second steel pipe curtain is a steel pipe curtain that has not been jacked into the soil body, the pipe joint stress test equipment is assembled on the second steel pipe curtain, the side wall of the second steel pipe curtain contacts the soil body during the jacking construction process, is mainly subjected to the pipe-soil friction resistance opposite to the jacking direction, the pipe joint stress test equipment changes with the size of the pipe-soil friction resistance that the second steel pipe curtain is subjected to, and changes the data to the automatic acquisition system through the data transmission cable, the automatic acquisition system converts the frequency into stress through the set conversion formula, and then completes the acquisition of the pipe joint stress of the pipe curtain during the jacking process.

[0023] Preferably, the pipe joint stress test equipment changes with the size of the pipe-soil friction resistance that the second steel pipe curtain is subjected to, and the specific change process is as follows:

[0024] The pipe joint stress testing equipment is connected with metal fixing assemblies at two ends, the positions of the two metal fixing assemblies change with the pipe-soil friction force of the second steel pipe pipe curtain, a vibrating string in the pipe joint stress testing equipment changes with the positions of the metal fixing assemblies, the resonance frequency changes with the tightness of the vibrating string, and the resonance frequency is transmitted to the automatic acquisition system through the data transmission cable.

[0025] Preferably, the jacking work in the second steel pipe pipe curtain is performed through a spiral drill rod.

[0026] Compared with the prior art, the pipe joint stress testing equipment has the following beneficial technical effects:

[0027] The pipe joint stress testing equipment is connected with metal fixing assemblies at two ends, the positions of the two metal fixing assemblies change with the pipe-soil friction force of the second steel pipe pipe curtain, a vibrating string in the pipe joint stress testing equipment changes with the positions of the metal fixing assemblies, the resonance frequency changes with the tightness of the vibrating string, and the resonance frequency is transmitted to the automatic acquisition system through the data transmission cable.

[0028] Further, the pipe joint stress testing equipment comprises a wire outlet box, two metal fixing assemblies and a test pipe, the wire outlet box is assembled on the test pipe, the two ends of the test pipe are fixed and assembled on the first steel pipe pipe curtain or the second steel pipe pipe curtain through the two metal fixing assemblies, a vibrating string is arranged in the test pipe, the two ends of the vibrating string are connected to the two metal fixing assemblies, a stress automatic acquisition system is connected to the vibrating string through the wire outlet box through a data transmission cable, and the stress data of the steel pipe pipe curtain in the process of jacking in the soil body is collected through the vibrating string between the two metal fixing assemblies, so that the stress data is collected.

[0029] Further, the data transmission cable is fixed on the first steel pipe pipe curtain or the second steel pipe pipe curtain through a plurality of metal cable buckles along the long edge direction of the pipe body, so that the data transmission cable is prevented from falling off and affecting the collection of stress data.

[0030] Further, the pipe joint stress testing equipment is provided with a soil retaining box, so that the pipe joint stress testing equipment is effectively protected and damage of the pipe joint stress testing equipment caused by the soil body is avoided.

[0031] Further, the male buckle and the female buckle are both L-shaped metal plate structures, facilitating the clamping of the two steel pipe roofs to each other and improving the stability of the two steel pipe roofs in stress testing.

[0032] The application further provides a testing method of the stress-testable spiral-excavation pipe roof structure. The pipe joint stress testing device is assembled on the second steel pipe roof. In the process of jacking construction, the side wall of the second steel pipe roof is in contact with the soil body and mainly bears the pipe-soil friction resistance in the direction opposite to the jacking direction. The pipe joint stress testing device changes with the size of the pipe-soil friction resistance borne by the second steel pipe roof, and transmits the change data to the automatic acquisition system through the data transmission cable. The automatic acquisition system converts the frequency into stress through the set conversion formula, and then completes the acquisition of the pipe joint stress of the pipe roof in the jacking process. Through the real-time acquisition of the pipe joint stress data of the pipe roof, the structural stability in the jacking process of the pipe roof can be judged in the first time, and then the jacking force, pressure, torque and rotating speed can be adjusted in time, effectively guiding the construction of the pipe roof.

[0033] Further, the pipe joint stress testing device is connected with metal fixing components at both ends. The positions of the two metal fixing components change with the size of the pipe-soil friction resistance borne by the second steel pipe roof. Meanwhile, there is a vibrating string in the pipe joint stress testing device. The tightness of the vibrating string changes with the position change of the metal fixing component, and the resonance frequency changes. The resonance frequency is transmitted to the automatic acquisition system through the data transmission cable. In the research on the stress characteristics in the construction process of the spiral-excavation small-diameter steel pipe roof, the traditional thinking of only formula derivation and numerical analysis verification can be broken through by acquiring the pipe joint stress measured data, and the research results are more convincing by comparing and verifying with the measured data. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 FIG. 1 is a structural schematic view of the pipe joint stress testing device in the application;

[0035] Figure 2 FIG. 2 is a schematic view of the pipe joint stress testing device fixing device in the application;

[0036] Figure 3 FIG. 3 is a schematic view of the stress-testable spiral-excavation pipe roof structure in the application;

[0037] Figure 4 FIG. 4 is a side view of the stress-testable spiral-excavation pipe roof structure in the application;

[0038] Figure 5 FIG. 5 is a structural schematic view of the pipe joint stress testing device protection device in the application;

[0039] Figure 6 FIG. 6 is a structural schematic view of the data transmission cable fixing device in the application;

[0040] Figure 7 A front view of a stress testable spiral-excavation pipe-roof structure in the present application.

[0041] In the figure: 1-pipe joint stress test equipment; 2-vibrating string; 3-metal connecting block; 4-outlet box; 5-data transmission cable; 6-metal fixed base; 7-stub screw; 8-spring pad; 9-automatic stress collection system; 10-metal fixed base welding point; 11-fixing bolt; 12-soil retaining box; 13-metal cable buckle; 14-first steel pipe pipe-roof; 15-second steel pipe pipe-roof; 16-spiral drill rod; 17-male buckle; 18-female buckle; 19-test pipe; 61-base; 62-upper cover. DETAILED DESCRIPTION

[0042] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0043] The present application will be further described in detail below in conjunction with the accompanying drawings:

[0044] The present application aims to provide a stress testable spiral-excavation pipe-roof structure and a test method, to solve the technical problem of difficulty in pipe joint stress testing in the existing spiral-excavation steel pipe pipe-roof jacking construction process, thereby affecting the on-site construction and theoretical research of such pipe-roof.

[0045] Specifically, according to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the stress testable spiral unearthing pipe curtain structure includes a first steel pipe curtain 14, a second steel pipe curtain 15, a pipe joint stress test device 1 and a stress automatic acquisition system 9; the first steel pipe curtain 14 is provided with female buckles 18 at the upper and lower ends of one side along the long edge direction of the pipe body; the second steel pipe curtain 15 is provided with male buckles 17 at the upper and lower ends of one side along the long edge direction of the pipe body, the first steel pipe curtain 14 is correspondingly clamped with the two groups of male buckles 17 on the second steel pipe curtain 15 through the two groups of female buckles 18, and a gap is formed between the upper and lower groups of female buckles 18 and male buckles 17, the pipe joint stress test device 1 is assembled on the first steel pipe curtain 14 or the second steel pipe curtain 15 in the gap, and the stress automatic acquisition system 9 is connected with the pipe joint stress test device 1 through a data transmission cable 5; wherein, when the pipe joint stress test device 1 is assembled on the second steel pipe curtain 15, the first steel pipe curtain 14 is a steel pipe curtain that has been jacked into the soil body, and the second steel pipe curtain 15 is a steel pipe curtain that has not been jacked into the soil body; when the pipe joint stress test device 1 is assembled on the first steel pipe curtain 14, the second steel pipe curtain 15 is a steel pipe curtain that has been jacked into the soil body, and the first steel pipe curtain 14 is a steel pipe curtain that has not been jacked into the soil body.

[0046] Specifically, according to Figure 1 and Figure 2 , the pipe joint stress test device 1 includes a wire outlet box 4, two groups of metal fixing assemblies and a test pipe 19.

[0047] The wire outlet box 4 is assembled on the test pipe 19, and the two ends of the test pipe 19 are fixedly assembled on the first steel pipe curtain 14 or the second steel pipe curtain 15 through the two groups of metal fixing assemblies, the test pipe 19 is provided with a vibrating string 2, the two ends of the vibrating string 2 are connected to the two groups of metal fixing assemblies, and the stress automatic acquisition system 9 is connected to the vibrating string 2 through the data transmission cable 5 and the wire outlet box 4.

[0048] Among them, the data transmission cable 5 is fixed on the first steel pipe curtain 14 or the second steel pipe curtain 15 through a plurality of metal cable buckles 13 along the long edge direction of the pipe body.

[0049] Among them, the two ends of the vibrating string 2 are pulled tight to form a tight structure through the two groups of metal fixing assemblies.

[0050] Among them, according to Figure 1 and Figure 2As shown, the metal fixing assembly comprises a metal connecting block 3, a metal fixing base 6, a head screw 7 and a fixing bolt 11; the metal fixing base 6 comprises a base 61 and an upper cover 62, the metal connecting block 3 is placed on the base 61, and the upper cover 62 is tightly pressed on the metal connecting block 3, wherein one side of the upper cover 62 is fixed on the base 61 through the fixing bolt 11, and the other side is fixed on the base 6 through the head screw 7, wherein a spring pad 8 is arranged between the head screw 7 and the upper cover 62; the two sides of the base 61 are respectively welded on the pipe wall of the first steel pipe pipe curtain 14 or the second steel pipe pipe curtain 15, and the two ends of the vibrating string 2 are respectively connected to the metal connecting block 3.

[0051] Specifically, the pipe segment stress testing equipment 1 is externally provided with a soil blocking box 12, effectively protecting the pipe segment stress testing equipment and avoiding damage to the pipe segment stress testing equipment by the soil.

[0052] Specifically, the male buckle 17 and the female buckle 18 are both L-shaped metal plate structures, facilitating the clamping of the two steel pipe curtains with each other and improving the stability of the two steel pipe curtains in the stress test.

[0053] In the assembly, when the first steel pipe curtain 14 is a steel pipe curtain that has been jacked into the soil, and the second steel pipe curtain 15 is a steel pipe curtain that has not been jacked into the soil, in the jacking process of the second steel pipe curtain 15, the soil is discharged through the spiral drill rod 16 in the pipe, the inner side of the second steel pipe curtain 15 is always in a cutting and slagging state, so the pipe segment stress testing device cannot be installed on the inner side of the second steel pipe curtain 15; at the same time, since the second steel pipe curtain 15 is always in contact with the soil during the jacking process, if the pipe segment stress testing device is installed on the outer side of the second steel pipe curtain 15, the testing device and the connecting cable are extremely easy to be damaged. Therefore, it is first proposed to install the pipe segment stress testing equipment 1 between the male buckle 17 of the second steel pipe curtain 15 and the female buckle 18 of the first steel pipe curtain 14.

[0054] After determining the specific installation position of the pipe segment stress testing equipment 1, the surface of the installation position of the second steel pipe curtain 15 is polished with coarse gauze, and the metal fixing base 6 is fixed on the second steel pipe curtain 15 by spot welding at the metal fixing base welding point 10.

[0055] ③After the metal fixing base 6 cools down, the pipe segment stress testing equipment 1 is installed in the metal fixing base 6 through the metal connecting block 3, and then the pipe segment stress testing equipment 1 is fixed by the head screw 7 and the spring pad 8, and the outlet box 4 faces upwards.

[0056] ④The high-strength data transmission cable 5 drawn from the outlet box 4 is connected to the automatic acquisition system 9 by tightly adhering to the surface of the second steel pipe curtain 15 through the metal cable buckle 13.

[0057] 5. The second steel pipe pipe curtain 15 before jacking construction, through the automatic acquisition system 9 measures whether the inherent data of pipe joint stress test equipment 1 is stable, otherwise it needs to be reinstalled.

[0058] 6. After reading the stable, welding the soil box 12 around the pipe joint stress test equipment 1, prevent the pipe joint stress test equipment 1 from being damaged by contacting with the soil.

[0059] 7. After everything is ready, the second steel pipe pipe curtain 15 jacking construction, spiral drill pipe 16 out of the earth, through the pipe joint stress test equipment 1 and automatic acquisition system 9 real-time record collection pipe joint stress in the process of jacking construction of the steel pipe curtain 15 to be jacked.

[0060] The application also provides a kind of stress testable spiral out of the earth pipe curtain structure test method based on the above described stress testable spiral out of the earth pipe curtain structure, including the following processes:

[0061] When the first steel pipe pipe curtain 14 is the steel pipe curtain in the jacked soil, and the second steel pipe pipe curtain 15 is the steel pipe curtain not jacked in the soil, the pipe joint stress test equipment 1 is assembled on the second steel pipe pipe curtain 15, and the side wall of the second steel pipe pipe curtain 15 contacts with the soil during jacking construction, mainly subjected to the pipe-soil friction resistance opposite to the jacking direction. The pipe joint stress test equipment 1 changes with the different pipe-soil friction resistance of the second steel pipe pipe curtain 15, and the change data is transmitted to the automatic acquisition system 9 through the data transmission cable 5. The automatic acquisition system 9 converts the frequency to stress through the set conversion formula, and then collects the pipe joint stress of the pipe curtain during jacking.

[0062] Wherein, the pipe joint stress test equipment 1 changes with the different pipe-soil friction resistance of the second steel pipe pipe curtain 15, and the specific change process is as follows:

[0063] The pipe joint stress test equipment 1 is connected with the metal fixing assembly at both ends, and the position of the two metal fixing assemblies changes with the different pipe-soil friction resistance of the second steel pipe pipe curtain 15. At the same time, there is a vibrating string 2 in the pipe joint stress test equipment 1, and the tightness of the vibrating string 2 changes with the position change of the metal fixing assembly, and the resonance frequency changes. The resonance frequency is transmitted to the automatic acquisition system 9 through the data transmission cable 5.

[0064] In summary, the present application provides a stress testable spiral unearthing pipe curtain structure and a test method, through a metal fixing base, for the first time proposes to weld a pipe joint stress test device between the gap between the male buckle outside the pipe curtain to be jacked and the female buckle outside the jacked pipe curtain, and weld a metal rectangular soil retaining box around the pipe joint stress test device. A high-strength data transmission cable is led out from the outlet box on the pipe joint stress test device, and is fixed by a metal cable buckle during the leading-out process, and is always close to the side wall of the pipe curtain to be jacked until the automatic acquisition system at the connection work platform. In the process of jacking the pipe curtain to be jacked, the metal connecting block is displaced, the vibrating string is loosened and changed, the resonance frequency is transmitted to the automatic acquisition system through the high-strength data transmission line, the automatic acquisition system converts the resonance frequency into stress, and then records the stress borne by the pipe joint of the steel pipe curtain at each construction stage.

[0065] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application and not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or replaced by the equivalent, without departing from the spirit and scope of the present application, any modification or equivalent replacement should be covered within the protection scope of the claims of the present application.

Claims

1. A stress-testable spiral egression pipe curtain structure, characterized in that, The utility model provides a kind of steel pipe stress testing device, including first steel pipe curtain (14), second steel pipe curtain (15), pipe joint stress testing device (1) and stress automatic acquisition system (9);The upper and lower ends of the side of the first steel pipe curtain (14) are respectively provided with female buckle (18) along the long side direction of pipe body;The upper and lower ends of the side of the second steel pipe curtain (15) are respectively provided with male buckle (17) along the long side direction of pipe body, the first steel pipe curtain (14) is respectively connected with the two groups of male buckle (17) on the second steel pipe curtain (15) by two groups of female buckle (18), and gap is formed between the upper and lower groups of female buckle (18) and male buckle (17), the pipe joint stress testing device (1) is assembled on the first steel pipe curtain (14) or the second steel pipe curtain (15) in gap, and the stress automatic acquisition system (9) is connected with pipe joint stress testing device (1) by data transmission cable (5);Wherein, when pipe joint stress testing device (1) is assembled in the second steel pipe curtain (15), the first steel pipe curtain (14) is the steel pipe curtain that has been jacked into soil body, and the second steel pipe curtain (15) is the steel pipe curtain that has not been jacked into soil body;When pipe joint stress testing device (1) is assembled in the first steel pipe curtain (14), the second steel pipe curtain (15) is the steel pipe curtain that has been jacked into soil body, and the first steel pipe curtain (14) is the steel pipe curtain that has not been jacked into soil body; The pipe joint stress testing device (1) includes outlet box (4), two groups of metal fixed components and test pipe (19); The outlet box (4) is assembled on the test pipe (19), and the two ends of the test pipe (19) are fixedly assembled on the first steel pipe curtain (14) or the second steel pipe curtain (15) by the two groups of metal fixed components, the test pipe (19) is provided with vibrating string (2), and the two ends of the vibrating string (2) are connected to the two groups of metal fixed components, and the stress automatic acquisition system (9) is connected to the vibrating string (2) through the outlet box (4) by the data transmission cable (5); The metal fixed component includes metal connecting block (3), metal fixed base (6), stud bolt (7) and fixed bolt (11);The metal fixed base (6) includes base (61) and upper cover (62), the metal connecting block (3) is placed on the base (61), and the upper cover (62) is pressed on the metal connecting block (3), wherein one side of the upper cover (62) is fixed on the base (61) by the fixed bolt (11), and the other side is fixed on the base (61) by the stud bolt (7), wherein the stud bolt (7) and the upper cover (62) are provided with elastic pad (8);The two sides of the base (61) are respectively welded on the pipe wall of the first steel pipe curtain (14) or the second steel pipe curtain (15), and the two ends of the vibrating string (2) are respectively connected to the metal connecting block (3); The pipe joint stress testing device (1) is externally provided with soil retaining box (12).

2. A stress-testable helical ground anchoring structure according to claim 1, characterised in that, The data transmission cable (5) is fixed on the first steel pipe curtain (14) or the second steel pipe curtain (15) by a plurality of metal cable buckles (13) along the long side direction of pipe body.

3. A stress-testable helical ground anchoring structure according to claim 1, wherein, Two ends of the vibrating string (2) are pulled tight by two sets of metal fixing components to form a tight structure.

4. A stress-testable helical ground anchoring structure according to claim 1, wherein, The male buckle (17) and the female buckle (18) are both L-shaped metal plate structures.

5. A method of testing a stress-testable helical ground freezing structure according to any one of claims 1 to 4, characterised in that, The method comprises the following steps: When the first steel pipe curtain (14) is a steel pipe curtain that has been jacked into the soil, and the second steel pipe curtain (15) is a steel pipe curtain that has not been jacked into the soil, the pipe joint stress testing device (1) is assembled on the second steel pipe curtain (15), and the side wall of the second steel pipe curtain (15) contacts the soil during the jacking construction process, mainly resisting the pipe-soil friction resistance in the direction opposite to the jacking direction. The pipe joint stress testing device (1) changes with the pipe-soil friction resistance received by the second steel pipe curtain (15), and transmits the change data to the stress automatic acquisition system (9) through the data transmission cable (5). The stress automatic acquisition system (9) converts the frequency into stress through the set conversion formula, and then completes the acquisition of the pipe joint stress of the pipe curtain during the jacking process.

6. A method of testing a stress-testable helical ground anchoring structure according to claim 5, wherein, The pipe joint stress testing device (1) changes with the pipe-soil friction resistance received by the second steel pipe curtain (15), and the specific change process is as follows: The pipe joint stress testing device (1) is connected with metal fixing components at both ends, and the positions of the two metal fixing components change with the pipe-soil friction resistance received by the second steel pipe curtain (15). Meanwhile, the pipe joint stress testing device (1) has a vibrating string (2), and the tightness of the vibrating string (2) changes with the change of the positions of the metal fixing components, so that the resonance frequency changes. The resonance frequency is transmitted to the stress automatic acquisition system (9) through the data transmission cable (5).

7. A method of testing a stress-testable helical ground anchoring structure according to claim 5, wherein, The second steel pipe curtain (15) is jacked through the spiral drill rod (16).

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