A test method and test device for bite-jointed pipe jacking construction

Abstract

The present invention provides a test method for interlocking jacking construction: S1. Using a cast-in-place concrete platform to simulate bedrock strata, using concrete of different grades to simulate rocks of different compressive strengths, and designing different concrete combinations as needed to simulate the uneven hardness of the excavation face; S2. First, jacking the pilot pipes at both ends, and after penetrating, measuring the construction deviation of the pilot pipes; S3. Then, jacking the interlocking jacking pipe, which includes an interlocking jacking pipe body, a first guide pipe, and a second guide pipe, one end of the interlocking jacking pipe body is fixedly connected to the first guide pipe, and the other end of the interlocking jacking pipe body is connected to the second guide pipe via a flexible joint; S4. The jacking process of the interlocking jacking pipe is monitored and the monitoring data is recorded; S5. As the interlocking jacking pipe is advanced, the previously constructed pilot pipe is pushed out section by section, and the construction performance of the interlocking jacking pipe is evaluated based on the jacking time and monitoring data of the interlocking jacking pipe. The present invention also provides a test device for interlocking jacking construction.

Description

Technical Field

[0001] The invention belongs to the field of tunnel engineering, can be applied to bite-joint jacking construction tests, and particularly relates to a test method and a test device for bite-joint jacking construction. Background Art

[0002] The combined interlocking jacking pipe is a newly proposed construction machine that combines multiple jacking pipes together and overlaps the cutterhead excavation contours of adjacent jacking pipes. It can be widely used in pre-built and post-excavation tunnels, underground structure partition protection and other projects.

[0003] The adjacent cutterheads of the interlocking pipe jacking equipment are staggered front and back, and the cutterheads are subjected to uneven force during rotation, which may lead to problems such as difficulty in controlling the excavation direction, large construction errors, and large construction vibrations. In addition, when constructing interlocking pipe jacking, the jacking pipes at both ends are constructed first, and then the jacking pipes at both ends are used as pilot pipes to position the interlocking pipe body for subsequent construction. In order to adapt to the construction errors of the pilot pipes at both ends, the jacking structure of the subsequent construction must have a flexible joint with the guide pipes on both sides at least at one end, that is, there is a certain gap between the subsequent jacking structure and the guide pipe, so that there is a certain space between the two to allow relative displacement. In order to ensure construction safety, the gap between the two structures must be equipped with a corresponding water-stopping device. The deviation between the two structures will directly affect the water-stopping effect of the connection part.

[0004] In view of the possible problems in the construction of interlocking pipe jacking, especially the low excavation efficiency, difficult direction control, large vibration, and high waterproof requirements for structural construction in bedrock formations, it is necessary to design a method and test platform device for the construction test of interlocking pipe jacking, so as to detect possible problems before construction and propose feasible solutions. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a test method and a test device for bite-type jacking construction. The present invention at least solves some of the problems in the prior art.

[0006] The present invention is achieved in that:

[0007] The present invention provides a test method for bite-joint pipe jacking construction, comprising:

[0008] S1. Use a cast-in-place concrete platform to simulate bedrock strata. Use concrete of different grades to simulate rocks of different compressive strengths. Design concrete combinations of different grades as needed to simulate uneven hardness and softness on the excavation face. The longitudinal length of the concrete platform is the length of the test jacking. The test interlocking jacking pipe assembly starts excavation from one end of the concrete platform and is received from the other end.

[0009] S2. First push in the pilot pipes at both ends, measure the construction deviation of the pilot pipes after penetration, and keep records;

[0010] S3. Push the interlocking jacking pipe again. The interlocking jacking pipe includes an interlocking jacking pipe body, a first guide pipe located on one side of the interlocking jacking pipe body, and a second guide pipe located on the other side of the interlocking jacking pipe body. The guide pipes are connected one-to-one with the previously constructed pilot pipes. One end of the interlocking jacking pipe body is fixedly connected to the first guide pipe, and the other end of the interlocking jacking pipe body is connected to the second guide pipe via a flexible joint.

[0011] S4. Monitor the jacking process of the bite jacking pipe and record the monitoring data;

[0012] S5. As the interlocking pipe jacking advances, the pilot pipe constructed earlier is pushed out section by section. The construction performance of the interlocking pipe jacking is evaluated based on the time of the interlocking pipe jacking and the above-mentioned monitoring data.

[0013] Furthermore, in S1 , the shapes of the structural surfaces between concretes of different grades are designed and arranged according to requirements.

[0014] Furthermore, in S1, a construction space of not less than 1 m is left on both sides of the test bite jacking pipe combination in the width direction of the cross section of the concrete platform, a construction space of not less than 1 m is left above the test bite jacking pipe combination in the height direction of the concrete platform, and a construction space of not less than 0.5 m is left below the test bite jacking pipe combination in the height direction of the concrete platform.

[0015] Furthermore, in S3, the body of the bite-jack pipe is a box-shaped structure.

[0016] Furthermore, in S3, the design of the flexible joint adopts: the second guide tube opens toward one side of the bite top tube body, and an upper end plate and a lower end plate are provided on the inner side of the pipe at the opening, and the bite top tube body extends into the second guide tube, and the bite top tube body is located between the upper end plate and the lower end plate, and the upper end plate and the lower end plate are both connected to the bite top tube body through a water-stopping rubber plate that plays a water-stopping role, and the upper end plate and the lower end plate both extend longitudinally.

[0017] Furthermore, in S4, the advancement process of the interlocking jacking pipe is monitored, including setting displacement monitoring in the lateral and normal directions at the end of the interlocking jacking pipe body extending into the second guide pipe, measuring the displacement changes in real time, and keeping records.

[0018] Furthermore, in S4, the jacking process of the interlocking jacking pipe is monitored, and a water injection pipe is pre-buried in the concrete platform, and water is injected into the concrete platform through the water injection pipe to increase pressure, simulate different water pressure conditions, and monitor the water leakage of the water-stop rubber plate.

[0019] Furthermore, in S4, the jacking process of the interlocking jacking pipe is monitored, which also includes setting a vibration monitoring point at the end of the interlocking jacking pipe body extending into the second guide pipe to measure and record the amplitude of the construction vibration.

[0020] The present invention also provides a test device for interlocking jacking construction, including a concrete platform simulating bedrock formations, and a test interlocking jacking combination for jacking construction in the concrete platform. The concrete platform includes concrete of several different grades. The test interlocking jacking combination includes two guide pipes that are first jacked into the concrete platform and an interlocking jacking pipe that is later jacked into the concrete platform. The interlocking jacking pipe includes a first guide pipe, a second guide pipe, and an interlocking jacking pipe body located between the first guide pipe and the second guide pipe. The guide pipes are welded and fixed to the guide pipes in a one-to-one correspondence. The first guide pipe and the second guide pipe are located behind the corresponding guide pipe along the jacking direction. One end of the interlocking jacking pipe body is fixedly connected to the first guide pipe, and the other end of the interlocking jacking pipe body is connected to the second guide pipe via a flexible joint.

[0021] Furthermore, the interlocking jacking pipe body is a box-type structure, and the second guide pipe is open to one side of the interlocking jacking pipe body. An upper end plate and a lower end plate are provided on the inner side of the pipe at the opening. The interlocking jacking pipe body extends into the second guide pipe, and the interlocking jacking pipe body is located between the upper end plate and the lower end plate. The upper end plate and the lower end plate are both connected to the interlocking jacking pipe body through a water-stopping rubber plate that plays a water-stopping role. The upper end plate and the lower end plate both extend longitudinally, and a water injection pipe is pre-buried in the concrete platform, and the water injection pipe is arranged close to the flexible joint.

[0022] The present invention has the following beneficial effects:

[0023] 1. The test device and method proposed in the present invention can simulate various working conditions such as rock formations of different strengths, uneven hardness and softness, and structural surface distribution, and test the adaptability of the jacking machine, jacking structure, etc. to the stratum before the jacking construction.

[0024] 2. The test device and method proposed in the present invention can simulate different water pressure conditions, test the waterproof effect of the waterproof material at the flexible joints of the bite-jacking structure, and then check or optimize the material, size, layout, etc. of the waterproof material before the bite-jacking construction.

[0025] 3. The test device and method proposed in the present invention can measure the construction accuracy, vibration conditions and relative displacement between the bite pipe jacking machine and the guide pipe with a flexible joint, so as to formulate an accuracy and vibration control plan before the bite pipe jacking construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A test device for bite-joint pipe jacking construction provided in an embodiment of the present invention;

[0028] Figure 2 A diagram showing the relationship between the occlusal pipe jacking cutter head provided in an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the movable end of the occlusal jacking pipe provided in an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the structure of a flexible joint provided in an embodiment of the present invention;

[0031] Figure 5 The present invention provides an embodiment of the present invention for the arrangement of measuring points for the bite pipe jacking construction test. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] like Figure 1-Figure 5 The first embodiment of the present invention provides a test method for bite-jointed pipe jacking construction, comprising:

[0034] S1. Use a cast-in-place concrete platform 1 to simulate bedrock formations. Use concrete of different grades to simulate rocks of different compressive strengths. Design concrete combinations of different grades as needed to simulate uneven hardness and softness on the tunneling face. The longitudinal length of the concrete platform 1 is the length of the test jacking. The test interlocking jacking pipe assembly 3 starts excavation from one end of the concrete platform 1 and is received from the other end.

[0035] S2. First push in the pilot pipes at both ends, measure the construction deviation of the pilot pipes after penetration, and keep records;

[0036] S3. Push the interlocking jacking pipe again. The interlocking jacking pipe includes an interlocking jacking pipe body 5, a first guide pipe 4-1 located on one side of the interlocking jacking pipe body 5, and a second guide pipe 4-2 located on the other side of the interlocking jacking pipe body 5. The guide pipes are connected to the previously constructed pilot pipes in a one-to-one correspondence. One end of the interlocking jacking pipe body 5 is fixedly connected to the first guide pipe 4-1, and the other end of the interlocking jacking pipe body 5 is connected to the second guide pipe 4-2 via a flexible joint.

[0037] S4. Monitor the jacking process of the bite jacking pipe and record the monitoring data;

[0038] S5. As the interlocking jacking advances, the previously constructed pilot pipe is pushed out section by section. The interlocking jacking performance is evaluated based on the interlocking jacking advancement time and the aforementioned monitoring data, and the interlocking jacking construction plan is further optimized. In this embodiment, the cast-in-place concrete platform 1 includes a first concrete block 1-1 and a second concrete block 1-2. The first concrete block 1-1 is made of one grade of concrete, and the concrete block 1-2 is made of another grade of concrete. The shape of the structural surface between the two concrete blocks can also be designed and arranged as required.

[0039] In S1, the structural surface shapes between concretes of different grades are designed and arranged according to requirements. In S1, a cast-in-place concrete platform 1 is constructed at an appropriate location, and the lower foundation of the concrete platform 1 satisfies the requirement of not sliding or overturning under the jacking force of the jacking pipe. In S1, a construction space of not less than 1m is left on both sides of the test interlocking jacking pipe combination 3 in the cross-sectional width direction of the concrete platform 1, a construction space of not less than 1m is left above the test interlocking jacking pipe combination 3 in the height direction of the concrete platform 1, and a construction space of not less than 0.5m is left below the test interlocking jacking pipe combination 3 in the height direction of the concrete platform 1.

[0040] In S3, the bite top pipe body 5 is Figure 3 The box-type structure in the middle. In other embodiments, the interlocking top tube body 5 may also be an interlocking circular structure. In S3, the design of the flexible joint adopts: the second guide tube 4-2 opens toward one side of the interlocking top tube body 5, and an upper end plate and a lower end plate are provided on the inner side of the pipe at the opening, and the interlocking top tube body 5 extends into the second guide tube 4-2, and the interlocking top tube body 5 is located between the upper end plate and the lower end plate, and the upper end plate and the lower end plate are both connected to the interlocking top tube body 5 through a water-stopping rubber plate 7 that plays a water-stopping role, and the upper end plate and the lower end plate both extend longitudinally (longitudinal direction, i.e., the jacking direction). The water-stopping rubber plate 7 is bent toward the outside of the second guide tube 4-2, and the water-stopping rubber plate 7 is fitted and connected to the interlocking top tube body 5. In this embodiment, there are two upper end plates and two lower end plates, and the upper end plates and the lower end plates are arranged symmetrically one by one, Figure 4 The mediolateral end plate 6-1 and the medial end plate 6-2 are both upper end plates.

[0041] During the construction of the interlocking jacking pipe, the end of the interlocking jacking pipe body 5 will move relatively inside the second guide pipe 4-2. In S4, the jacking process of the interlocking jacking pipe is monitored, including setting displacement monitoring in the lateral and normal directions at the end of the interlocking jacking pipe body 5 extending into the second guide pipe 4-2. Figure 5 Points A and B measure the horizontal displacement of the structure, and points A and C measure the normal position of the structure. The displacement changes are measured in real time and recorded.

[0042] When the interlocking jacking pipe body 5 and the second guide pipe 4-2 move relative to each other, the water-stopping rubber plate 7 is deformed. It is necessary to test the waterproof effect after the deformation. Therefore, in S4, the jacking process of the interlocking jacking pipe is monitored, and the process also includes pre-buried water injection pipe 2 in the concrete platform 1. Water is injected into the concrete platform 1 through the water injection pipe 2 to increase pressure, simulating different water pressure conditions, and monitoring the water leakage of the water-stopping rubber plate 7. The water injection pipe 2 is set close to the flexible joint. To avoid affecting the jacking excavation, a certain amount of concrete is reserved at the bottom of the water injection pipe 2 before the jacking cutter head excavates. The concrete at the bottom of the water injection pipe 2 is pierced after the cutter head passes through.

[0043] To monitor the vibrations caused by the cutterhead cutting the formation, the jacking process of the interlocking jacking pipe is monitored in S4. This includes setting a vibration monitoring point at point D, where the end of the interlocking jacking pipe body 5 extends into the second guide pipe 4-2, to measure and record the amplitude of the construction vibrations. The end of the jacking pipe body 5 extending into the second guide pipe 4-2 is a flat plate.

[0044] Embodiment 2 of the present invention provides a test device for interlocking jacking construction, including a concrete platform 1 simulating bedrock formations, and a test interlocking jacking assembly 3 for jacking construction in the concrete platform 1. The concrete platform 1 includes concrete of several different grades. The test interlocking jacking assembly 3 includes two guide pipes that are first jacked into the concrete platform 1 and an interlocking jacking pipe that is later jacked into the concrete platform 1. The interlocking jacking pipe includes a first guide pipe 4-1, a second guide pipe 4-2, and an interlocking jacking pipe body 5 located between the first guide pipe 4-1 and the second guide pipe 4-2. The guide pipes are welded and fixed to the guide pipes in a one-to-one correspondence. The first guide pipe 4-1 and the second guide pipe 4-2 are located behind the corresponding guide pipes along the jacking direction. One end of the interlocking jacking pipe body 5 is fixedly connected to the first guide pipe 4-1, and the other end of the interlocking jacking pipe body 5 is connected to the second guide pipe 4-2 through a flexible joint. The interlocking jacking pipe body 5 is a box-shaped structure. The second guide pipe 4-2 opens toward one side of the interlocking jacking pipe body 5. An upper end plate and a lower end plate are provided on the inner side of the pipe at the opening. The interlocking jacking pipe body 5 extends into the second guide pipe 4-2. The interlocking jacking pipe body 5 is located between the upper end plate and the lower end plate. The upper end plate and the lower end plate are connected to the interlocking jacking pipe body 5 through a water-stopping rubber plate 7 that has a water-stopping effect. The upper end plate and the lower end plate extend longitudinally. A water injection pipe 2 is pre-buried in the concrete platform 1. The water injection pipe 2 is provided near the flexible joint. Figure 2As shown, first push in the first pilot tube 3-1 and the second pilot tube 3-2, then push in the bite-jointed jacking tube body 5 at the position of the third tube 3-3 and the fourth tube 3-4. Figure 3 Shown are a first guide tube 4-1, a second guide tube 4-2, and a box-shaped interlocking top tube body 5.

[0045] In view of the possible problems in the construction of interlocking pipe jacking, before construction, it is necessary to understand the difficulty of precision control of the interlocking pipe jacking equipment in the stratum to be constructed, the possible construction vibration, and verify the applicability of the interlocking pipe jacking structure and equipment in the stratum to be constructed; before construction, it is necessary to verify the waterproof effect of the flexible joints in the interlocking pipe jacking structure.

[0046] In response to possible problems in the construction of interlocking jacking pipes, especially the problems of low excavation efficiency, difficult direction control, large vibration, and high requirements for waterproofing of structural construction in bedrock formations, the present invention proposes a test method and test platform device for interlocking jacking pipe construction, including a concrete platform simulating bedrock formations, guide pipes at both ends and an interlocking jacking pipe in the middle, an interlocking jacking pipe body and joint structures at both ends, various detection instruments, a water pressure loading device, etc., which can simulate various working conditions such as bedrock formations of different strengths, uneven soft and hard formations, and different water pressures, and test the feasibility of the arrangement and combination of interlocking jacking pipes, precision control, waterproof materials and arrangement methods, waterproof effects, construction vibration conditions, etc., so as to detect possible problems before construction and propose feasible solutions.

[0047] The present invention proposes a test method and test device for bite-jointed jacking construction. According to its characteristics, a cast-in-place concrete platform is used to simulate bedrock strata and uneven hardness. Water is injected into the concrete platform using a water injection pipe to simulate different water pressure conditions. Measuring points are arranged on the bite-jointed jacking pipe body to measure the construction accuracy, vibration, relative displacement of the structure, waterproof effect, etc. during the bite-jointed jacking construction.

[0048] Based on the design conditions and construction or research requirements, determine the composition, layout, test jacking length, etc. of the test section's bite-jacking pipe segments, and determine the dimensions of the concrete test bench. Based on the geological conditions, determine the concrete grade used in the concrete test bench, structural surface position and other parameters.

[0049] First test the pilot pipes at both ends, measure the construction deviation of the pilot pipes after they are connected, and keep records.

[0050] Next, the interlocking jacking pipe is constructed. It consists of a central interlocking jacking pipe body and two guide pipes on either side. The guide pipes are connected to the previously constructed pilot pipe. As the interlocking jacking pipe advances, the previously constructed pilot pipe is pushed out section by section. One end of the interlocking jacking pipe body is welded to the guide pipe, and the other end of the guide pipe is equipped with a movable joint. The interlocking jacking pipe body extends into the guide pipe through the movable joint, allowing a certain amount of relative displacement in the lateral and normal directions. A waterproof rubber sheet is installed at the end of the steel pipe opening at the movable joint.

[0051] In response to the technical requirements of the bite-joint jacking construction test, the present invention proposes a test method and device suitable for bite-joint jacking. The specific test method and device are as follows:

[0052] Use cast-in-place concrete platform 1 to simulate bedrock strata, use different grades of concrete to simulate rocks with different compressive strengths, and design different grades of concrete combinations to simulate uneven hardness and softness of the excavation face (you can simulate uneven strength up and down, or you can simulate uneven strength left and right), so as to attach Figure 1 Taking the working condition shown as an example, the cast-in-place concrete platform 1 includes a first concrete block 1-1 and a second concrete block 1-2. The first concrete block 1-1 is made of concrete of one grade, and the concrete block 1-2 is made of concrete of another grade. The shape of the structural surface between the two concrete blocks can also be designed and arranged according to needs.

[0053] Furthermore, the size of the concrete platform 1 is determined in the following manner: the longitudinal length of the concrete platform 1 is the length of the test jacking, and the test interlocking jacking pipe assembly 3 starts to be excavated from one end of the concrete platform 1 and is received from the other end; a construction space of not less than 1m is left on both sides of the test interlocking jacking pipe assembly 3 in the cross-sectional width direction of the concrete platform 1, a construction space of not less than 1m is left above the test interlocking jacking pipe assembly 3 in the height direction, and a construction space of not less than 0.5m is left below the test interlocking jacking pipe assembly 3.

[0054] Furthermore, a cast-in-place concrete platform 1 is constructed at a suitable location, and the lower foundation of the concrete platform 1 should be able to withstand the jacking force of the jacking pipe without slipping or overturning.

[0055] The test steps can be the same as the construction sequence of the combined bite pipe jacking, with the following Figure 2 The bite jacking arrangement shown in the figure is used as an example to illustrate that the first pilot pipe 3-1 and the second pilot pipe 3-2 are first pushed in, and the construction error during the pushing process is measured at the same time; then the bite jacking pipe body 5 at the position of the third pipe 3-3 and the fourth pipe 3-4 is pushed in, and the cutter heads of the third pipe 3-3 and the fourth pipe 3-4 are staggered front and back. The shape of the bite jacking pipe body 5 can be Figure 3The box-type structure can also be an interlocking circular structure; one end of the interlocking top tube body 5 is welded and fixed to the first guide tube 4-1, and the other end of the interlocking top tube body 5 is connected to the second guide tube 4-2 through a flexible joint, and the interlocking top tube body 5 and the second guide tube 4-2 can move relatively; the first guide tube 4-1 is welded and fixed to the first pilot tube 3-1, and the second guide tube 4-2 is welded and fixed to the second pilot tube 3-2.

[0056] Furthermore, the specific structure of the flexible joint is as follows: the second guide tube 4-2 is open on one side, with two end plates arranged longitudinally along the inside of the pipe at the opening: an outer end plate 6-1 and an inner end plate 6-2. The distance between the upper and lower end plates meets the requirements for insertion and construction errors of the interlocking jacking pipe body 5. Two water-stopping rubber plates 7 are fixed to end plates 6-1 and 6-2, respectively, to provide water-stopping. During interlocking jacking construction, due to the inevitable deviation of the jacking axis, the end of the interlocking jacking pipe body 5 will move relative to the inside of the second guide tube 4-2.

[0057] For the above-mentioned flexible joint, when the engaging jack tube body 5 and the second guide tube 4-2 move relative to each other, the displacement in the lateral and normal directions needs to be monitored. Figure 5 The working conditions shown are explained. Transverse and normal displacement monitoring is set at the end of the bite jacking pipe body 5 extending into the flexible joint. The measuring points are divided into two groups, where points A and B measure the displacement along the transverse direction of the structure, and points A and C measure the normal position of the structure. The displacement changes are measured in real time and recorded.

[0058] For the above-mentioned flexible joint, when the engaging jacking pipe body 5 and the second guide pipe 4-2 move relative to each other, the water-stopping rubber plate 7 is deformed. It is necessary to test the waterproof effect after deformation. The specific plan is: a water injection hole is set in the middle of the concrete platform 1, and a water injection pipe 2 is pre-buried. In order to avoid affecting the jacking excavation, a certain amount of concrete is reserved at the bottom of the water injection pipe 2 before the jacking cutter disc excavates. After the cutter disc passes, the concrete at the bottom of the water injection pipe 2 is pierced, water is injected and pressurized, and the water leakage of the water-stopping rubber plate 7 is observed.

[0059] In order to monitor the vibration of the cutterhead cutting the formation, a vibration monitoring point is set at the front end point D of the flat structure, and indicators such as the amplitude of the construction vibration are measured and recorded.

[0060] According to construction or research requirements, the next set of interlocking jacking pipes can be pushed in for testing.

[0061] The construction performance of the bite pipe jacking was evaluated based on the jacking time of the bite pipe jacking and the above monitoring data.

[0062] The above description is merely a description of the basic principles of the present invention and does not limit the test method and apparatus of the present invention to any specific shape, size, arrangement, measurement method, data acquisition and analysis method, material, or test steps. Therefore, all possible modifications and equivalents that may be utilized fall within the scope of the patent application of the present invention.

[0063] The present invention provides a method and a test device suitable for interlocking jacking pipes and tunneling tests between interlocking jacking pipes and adjacent jacking pipes. Concrete is used to simulate bedrock, and concrete of different grades is used to simulate rocks of different compressive strengths. Concrete combinations of different grades can also be used to simulate the working condition of uneven hardness of bedrock strata in a tunneling section. Displacement monitoring in the lateral and normal directions of the flat plate structure is provided at the movable end of the interlocking jacking pipe to measure the tunneling deviation of the interlocking jacking pipe in real time during advancement. A vibration monitoring point is provided at the movable end of the flat plate structure behind the interlocking jacking pipe to measure the vibration of the interlocking jacking pipe during tunneling in the bedrock. Openings are reserved in the concrete platform, pipes are pre-buried, and a certain concrete protective layer is reserved between the pipes and the excavation contour. After the cutterhead has tunneled, the reserved concrete protective layer is opened, and water is injected and pressurized through the pre-buried pipe to test the construction waterproofing ability of the movable end of the interlocking jacking pipe.

[0064] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A test method for bite-jointed pipe jacking construction, characterized in that: include: S1. Use a cast-in-place concrete platform to simulate bedrock strata. Use concrete of different grades to simulate rocks of different compressive strengths. Design concrete combinations of different grades as needed to simulate uneven hardness and softness on the excavation face. The longitudinal length of the concrete platform is the length of the test jacking. The test interlocking jacking pipe assembly starts excavation from one end of the concrete platform and is received from the other end. S2. First push in the pilot pipes at both ends, measure the construction deviation of the pilot pipes after penetration, and keep records; S3. Push the interlocking jacking pipe again. The interlocking jacking pipe includes an interlocking jacking pipe body, a first guide pipe located on one side of the interlocking jacking pipe body, and a second guide pipe located on the other side of the interlocking jacking pipe body. The guide pipes are connected one-to-one with the previously constructed pilot pipes. One end of the interlocking jacking pipe body is fixedly connected to the first guide pipe, and the other end of the interlocking jacking pipe body is connected to the second guide pipe via a flexible joint. S4. Monitor the jacking process of the bite jacking pipe and record the monitoring data; S5. As the interlocking pipe jacking advances, the pilot pipe constructed earlier is pushed out section by section. The construction performance of the interlocking pipe jacking is evaluated based on the time of the interlocking pipe jacking and the above monitoring data. In S1, the concrete platform includes a first concrete block and a second concrete block, the first concrete block is made of concrete of one grade, and the second concrete block is made of concrete of another grade, and the first concrete block and the second concrete block are arranged in the up-down direction or the left-right direction to simulate uneven strength in the up-down direction or the left-right direction.

2. The test method for bite-jointed pipe jacking construction according to claim 1, characterized in that: In S1, the shapes of the structural surfaces between concretes of different grades are designed and arranged according to requirements.

3. The test method for bite-jointed pipe jacking construction according to claim 1, characterized in that: In S1, a construction space of not less than 1m is reserved on both sides of the test bite-jacking pipe combination in the width direction of the cross section of the concrete platform, a construction space of not less than 1m is reserved above the test bite-jacking pipe combination in the height direction of the concrete platform, and a construction space of not less than 0.5m is reserved below the test bite-jacking pipe combination in the height direction of the concrete platform.

4. The test method for bite-jointed pipe jacking construction according to claim 1, characterized in that: In S3, the bite top pipe body is a box-shaped structure.

5. The test method for bite-jointed pipe jacking construction according to claim 4, characterized in that: In S3, the design of the flexible joint adopts: the second guide tube opens toward one side of the interlocking top tube body, and an upper end plate and a lower end plate are provided on the inner side of the pipe at the opening. The interlocking top tube body extends into the second guide tube, and the interlocking top tube body is located between the upper end plate and the lower end plate. The upper end plate and the lower end plate are both connected to the interlocking top tube body through a water-stopping rubber plate that plays a water-stopping role, and the upper end plate and the lower end plate both extend longitudinally.

6. The test method for bite-jointed pipe jacking construction according to claim 5, characterized in that: In S4, the advancement process of the interlocking jacking pipe is monitored, including setting displacement monitoring in the lateral and normal directions at the end of the interlocking jacking pipe body extending into the second guide pipe, measuring the displacement changes in real time, and keeping records.

7. The test method for bite-jointed pipe jacking construction according to claim 6, characterized in that: In S4, the jacking process of the interlocking jacking pipe is monitored, and water injection pipes are pre-buried in the concrete platform. Water is injected into the concrete platform through the water injection pipes to increase pressure, simulate different water pressure conditions, and monitor the water leakage of the water-stop rubber plate.

8. The test method for bite-jointed pipe jacking construction according to claim 7, characterized in that: In S4, the jacking process of the interlocking jacking pipe is monitored, which also includes setting a vibration monitoring point at the end of the interlocking jacking pipe body extending into the second guide pipe to measure and record the amplitude of the construction vibration.

9. A test device for bite-jointed pipe jacking construction, characterized by: The invention comprises a concrete platform simulating bedrock strata and a test interlocking jacking pipe combination for jacking construction in the concrete platform. The concrete platform comprises concrete of several different grades. The test interlocking jacking pipe combination comprises two guide pipes that are first jacked into the concrete platform and an interlocking jacking pipe that is later jacked into the concrete platform. The interlocking jacking pipe comprises a first guide pipe, a second guide pipe, and an interlocking jacking pipe body located between the first guide pipe and the second guide pipe. The guide pipes are welded and fixed to the guide pipes in a one-to-one correspondence. The first guide pipe and the second guide pipe are located behind the corresponding guide pipes along the jacking direction. One end of the interlocking jacking pipe body is fixedly connected to the first guide pipe, and the other end of the interlocking jacking pipe body is connected to the second guide pipe via a flexible joint.

10. The test device for bite-jointed pipe jacking construction according to claim 9, characterized in that: The interlocking jacking pipe body is a box-shaped structure, and the second guide pipe is open to one side of the interlocking jacking pipe body. An upper end plate and a lower end plate are provided on the inner side of the pipe at the opening. The interlocking jacking pipe body extends into the second guide pipe. The interlocking jacking pipe body is located between the upper end plate and the lower end plate. The upper end plate and the lower end plate are connected to the interlocking jacking pipe body through a water-stopping rubber plate that plays a water-stopping role. The upper end plate and the lower end plate both extend longitudinally, and a water injection pipe is pre-buried in the concrete platform. The water injection pipe is arranged close to the flexible joint.

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