Test system and method for high-water-pressure water-rich stratum pipe jacking construction evaluation

Abstract

The invention relates to the technical field of underground structure construction, in particular to a test system and method for high-water-pressure water-rich stratum pipe jacking construction evaluation, and the test system mainly comprises a test box, a pipeline, a grouting device, a pushing device, a monitoring device and a water injection device. Through the structural cooperation of the test box, the pipeline, the grouting device, the pushing device, the monitoring device and the water injection device, the grouting test environment under the high-water-pressure water-rich stratum can be effectively simulated; and a comprehensive data basis is provided for evaluating the pressure influence of the grout on the pipeline in the pipe jacking construction process and the influence of different grout proportions, different grouting hole arrangement forms and different grouting time on the drag reduction effect, so that the technical effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of underground structure construction, and in particular to a test system and method for evaluating pipe jacking construction in high water pressure and water-rich strata. Background Art

[0002] Mud-water balanced pipe jacking is an advanced trenchless construction technology in underground structure construction projects. It has the advantages of fast construction speed, high construction precision, and small construction disturbance. It is widely used in urban water supply and drainage systems, natural gas and oil pipelines, communication and power cable laying and other fields. However, when encountering high water pressure and water-rich strata during pipe jacking construction, many problems will be faced, including unstable strata, increased pipeline advancement resistance, and soil erosion. These problems not only increase the difficulty of construction, but may also lead to engineering accidents.

[0003] In order to cope with the above-mentioned problems, grouting technology has become an important auxiliary construction method in pipe jacking construction. Grouting technology is widely used to improve formation conditions, reduce construction resistance and prevent soil erosion. By injecting slurry into the formation, the stability of the formation can be enhanced, the friction resistance during the pipe jacking process can be reduced, and the construction environment can be improved. However, in high-pressure water-rich formations, when the slurry displaces groundwater, the groundwater will also dilute the slurry. It is necessary to continuously test and adjust parameters such as the grouting ratio in order to achieve a better drag reduction effect. At the same time, grouting is difficult under water-rich conditions, and the grouting pressure tends to increase. A large grouting pressure may pose a threat to pipeline safety, such as partial or overall floating, misalignment, and cracking of the pipeline. Therefore, it is also necessary to evaluate the impact of grouting pressure on the pipe segment. Therefore, how to evaluate the impact of grouting pressure and the drag reduction effect of slurry in high-pressure water-rich formations has become a key technical problem that needs to be solved in pipe jacking construction. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a test system and method for evaluating pipe jacking construction in high water pressure and water-rich formations, so as to achieve the technical effect of providing comprehensive data support for the evaluation of the influence of grouting pressure and the drag reduction effect of slurry in high water pressure and water-rich formations.

[0005] A first aspect of an embodiment of the present invention discloses a test system for evaluating pipe jacking construction in a high water pressure and water-rich formation, comprising:

[0006] A test box, the test box comprising a containing space;

[0007] A pipeline, the pipeline comprising a first pipe section and a second pipe section connected to each other, the first pipe section and the second pipe section being arranged in the accommodating space;

[0008] A grouting device, the grouting device comprising a grouting assembly and a grouting hole that are interconnected, and the grouting hole is arranged on the second pipe section;

[0009] A pushing device, the pushing device comprising a pushing rod and a pushing rod controller, the pushing rod and the pushing controller are connected by electrical signals, wherein the pushing device pushes the pipeline to move;

[0010] A monitoring device, the monitoring device comprising a data collector, a first sensor, a second sensor and a third sensor, the data collector being electrically connected to the first sensor, the second sensor and the third sensor respectively, wherein the first sensor is arranged in the accommodating space and collects additional pressure data generated by the grout-tight soil body, the second sensor is arranged in the accommodating space and collects additional pressure data caused by grout seepage, and the third sensor is arranged on the first pipe section and collects pressure data of the grout acting on the pipeline;

[0011] A water injection device is communicated with the accommodating space.

[0012] Preferably, the pipeline includes a plurality of first pipe sections and second pipe sections that are connected to each other, and the plurality of first pipe sections and second pipe sections are alternately arranged in sequence.

[0013] Preferably, the pipeline further comprises: a third pipe section, one end of the third pipe section is connected to the first pipe section or the second pipe section, the other end of the third pipe section is connected to the pushing device, and the third pipe section is arranged outside the accommodating space.

[0014] Preferably, the first sensors include a plurality of sensors, the plurality of first sensors are arranged above the pipeline, and each of the first sensors is distributed within the range of the additional pressure generated by the grout-tight soil body;

[0015] The second sensors include a plurality of second sensors, which are arranged above the pipeline, and each of the second sensors is distributed within the range of the additional pressure caused by the slurry seepage.

[0016] Preferably, the jacking device also includes: a flange plate and a reaction wall, one end of the thrust rod is connected to the flange plate, and the other end is connected to the reaction wall.

[0017] Preferably, the test box includes: a bottom plate, on which a first side panel, a second side panel, a third side panel and a fourth side panel connected in sequence are arranged, and the first side panel and the third side panel are arranged opposite to each other, and the second side panel and the fourth side panel are arranged opposite to each other; wherein, the oppositely arranged first side panel and the third side panel are respectively provided with mounting holes, and the two mounting holes are respectively arranged correspondingly, or the oppositely arranged second side panel and the fourth side panel are respectively provided with mounting holes, and the two mounting holes are respectively arranged correspondingly.

[0018] Preferably, the bottom plate is made of steel plate; the first side plate and the third side plate are made of transparent organic glass, and the second side plate and the fourth side plate are made of steel plate; or, the first side plate and the third side plate are made of steel plate, and the second side plate and the fourth side plate are made of transparent organic glass.

[0019] Preferably, there are four grouting holes, which are evenly arranged on the second pipe section along the circumference of the second pipe section; or, there are six grouting holes, which are evenly arranged on the second pipe section along the circumference of the second pipe section.

[0020] Preferably, the grouting assembly further comprises: a grouting pump; and a grouting pipe, wherein the grouting pump is connected to the grouting hole through the grouting pipe.

[0021] The present invention adopts a test system composed of a test box, a pipeline, a grouting device, a jacking device, a monitoring device and a water injection device, and achieves a test environment that can effectively simulate grouting in a high-pressure water-rich formation through structural coordination among the test box, the pipeline, the grouting device, the jacking device, the monitoring device and the water injection device, and provides a comprehensive data basis for evaluating the pressure influence of slurry on the pipeline during the jacking construction process and the influence of different slurry ratios, different grouting hole arrangements and different grouting times on the drag reduction effect.

[0022] A second aspect of an embodiment of the present invention discloses a test method for evaluating pipe jacking construction in a high-water-pressure, water-rich formation. The method is applied to a test system for evaluating pipe jacking construction in a high-water-pressure, water-rich formation. The method comprises the following steps:

[0023] Step 1: Fill the accommodating space of the test box with soil and compact it so that the upper surface of the compacted soil is flush with the lower surface of the mounting hole;

[0024] Step 2: Install the pipe in the accommodation space of the test chamber through the installation hole, and connect the pipe to the push device;

[0025] Step 3: Continue to fill the accommodating space of the test box with soil and compact it, and set the first sensor and the second sensor above the pipeline, and connect the first sensor, the second sensor and the third sensor to the data collector for electrical signals respectively;

[0026] Step 4: Start the water injection device to inject water into the fill to the designed water level, and record the first data collected by the first sensor, the second sensor and the third sensor;

[0027] Step 5: Without grouting, start the jacking device to push the pipeline and record the first jacking force;

[0028] Step 6: Start the grouting device to inject slurry into the fill soil, and record the second data collected by the first sensor, the second sensor and the third sensor;

[0029] Step 7: Close the grouting device, start the jacking device to push the pipeline to move, and record the second jacking force;

[0030] Step 8: Repeat the above steps 1-7 by changing the slurry ratio, grouting hole arrangement and grouting time.

[0031] The present invention can collect data on the pressure effect of slurry on the pipeline during the pipe jacking construction process in each test test and the impact of different slurry ratios, different grouting hole arrangements, and different grouting times on the drag reduction effect through the above method steps. At the same time, the above method steps can be repeated by changing parameters such as the slurry ratio, grouting hole arrangement, and grouting time to obtain data from multiple test tests, thereby obtaining the optimal parameters of the slurry ratio, grouting hole arrangement, and grouting time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0033] Figure 1 is a schematic structural diagram of a first viewing angle disclosed in a first embodiment of the present invention;

[0034] Figure 2 is a structural schematic diagram of a second viewing angle disclosed in the first embodiment of the present invention;

[0035] Figure 3 is a schematic structural diagram of a third viewing angle disclosed in the first embodiment of the present invention;

[0036] Figure 4 is a schematic structural diagram of a fourth viewing angle disclosed in the first embodiment of the present invention;

[0037] Figure 5 It is a structural schematic diagram of the first second pipe segment disclosed in the first embodiment of the present invention;

[0038] Figure 6 It is a structural schematic diagram of the second pipe segment of the second type disclosed in the first embodiment of the present invention;

[0039] Reference numerals:

[0040] 1-test box, 11-bottom plate, 12-first side plate, 13-second side plate, 14-third side plate, 15-fourth side plate, 16-water outlet, 17-installation hole, 18-water stop ring;

[0041] 2-pipeline, 21-first pipe section, 22-second pipe section, 23-third pipe section;

[0042] 3-grouting device, 31-grouting hole, 32-grouting pipe, 33-grouting pump;

[0043] 4-thrust device, 41-flange, 42-thrust rod, 43-reaction wall, 44-thrust rod controller;

[0044] 5-monitoring device, 51-data collector, 52-first sensor, 53-second sensor, 54-third sensor;

[0045] 6-water injection device, 61-water storage tank, 62-water injection pump, 63-water injection pipe. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0047] In the present invention, the directions or positional relationships indicated by "upper", "lower", "outer", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0048] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0049] In addition, the terms "installed", "set", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0051] The inventive concept of the present invention is: due to the technical problems of the prior art in pipe jacking construction, such as unstable strata, increased pipeline propulsion resistance, and soil erosion, which will cause great construction difficulties and lead to engineering accidents, in order to solve the above problems, it is necessary to use auxiliary construction methods such as grouting technology in pipe jacking construction. However, during the grouting process, the setting of parameters such as grouting ratio and grouting pressure will affect the drag reduction effect of the pipeline and the pipeline body in the pipe jacking construction. Therefore, how to evaluate the influence of grouting pressure and the drag reduction effect of slurry under high water pressure and water-rich strata has become a key technical problem that needs to be solved in pipe jacking construction. The improvement provided in this example is to provide a test system and method for evaluating pipe jacking construction in high water pressure and water-rich strata to solve the above technical problems, as follows:

[0052] Example 1

[0053] like Figure 1-6 The test system for evaluating the construction of a pipe jacking in a high-pressure water-rich formation shown in the figure comprises: a test box 1, the test box 1 comprises a containing space; a pipeline 2, the pipeline 2 comprises a first pipe section 21 and a second pipe section 22 connected to each other, the first pipe section 21 and the second pipe section 22 are arranged in the containing space; a grouting device 3, the grouting device 3 comprises a grouting assembly and a grouting hole 31 connected to each other, the grouting hole 31 is arranged on the second pipe section 22; a pushing device 4, the pushing device 4 comprises a thrust rod 42 and a thrust rod controller 44, the thrust rod 42 and the thrust controller 44 are electrically connected, wherein the pushing device 4 pushes the pipeline 2 to move ; Monitoring device 5, the monitoring device 5 includes a data acquisition device 51, a first sensor 52, a second sensor 53 and a third sensor 54, the data acquisition device 51 is electrically connected to the first sensor 52, the second sensor 53 and the third sensor 54 respectively, wherein the first sensor 52 is arranged in the accommodating space and collects additional pressure data generated by the grout-tight soil body, the second sensor 53 is arranged in the accommodating space and collects additional pressure data caused by slurry seepage, and the third sensor 54 is arranged on the first pipe section 21 and collects pressure data of the slurry acting on the pipeline; Water injection device 6, the water injection device 6 is connected to the accommodating space.

[0054] The test system provided in this embodiment is mainly composed of a test box 1, a pipeline 2, a grouting device 3, a jacking device 4, a monitoring device 5 and a water injection device 6. First, a test box 1 with a accommodating space is set up, and various test equipment is loaded through the test box 1, such as test backfill, test pipeline 2, various test sensors, etc., to provide sufficient preparation conditions for the test; then, the water injection device 6 is connected to the accommodating space of the test box 1, and water is injected into the test backfill in the accommodating space through the water injection device 6 to simulate the environment of high water pressure and water-rich formations. The grouting device 3 is formed by connecting the grouting assembly and the grouting hole 31 to each other, and the grouting hole 31 is set on the second pipe section 22, and the first The second pipe section 22 is arranged in the accommodating space, so that the slurry (specifically, the slurry can be cement slurry) can be injected into the test fill in the accommodating space through the grouting hole 31 by the grouting assembly. At the same time, by selecting different slurry raw materials, controlling the grouting time of the grouting assembly, and the arrangement of the grouting hole 31 on the second pipe section 22, the premise of different slurry ratios, different grouting hole arrangements and different grouting times can be simulated. Therefore, the required test conditions in the construction process of grouting in high water pressure and water-rich formations can be simulated by the cooperation of the water injection device 6 and the grouting device 3. Secondly, the data acquisition device 51 is connected to the first sensor 52, the second sensor 53 and the third sensor 54 respectively. The monitoring device 5 is connected and composed of a first sensor 52 arranged in the accommodation space, and the additional pressure data generated by the grouting tight soil can be collected by the first sensor 52 and transmitted to the data collector 51. The second sensor 53 is arranged in the accommodation space, and the additional pressure data caused by the grout seepage can be collected by the second sensor 53 and transmitted to the data collector 51. The third sensor 54 is arranged on the first pipe section 21, and the first pipe section 21 is arranged in the accommodation space, and the pressure data of the grout acting on the pipeline 2 can be collected by the third sensor 54 and transmitted to the data collector 51. Since the pressure effect of the grout on the pipeline 2 refers to the effect of grouting on the pipeline pressure, this effect can be mainly divided into three Part: one is the pressure of the grouting slurry directly acting on the pipeline; the second is the additional pressure generated by the grouting tight soil (the additional pressure generated by the grouting tight soil refers to the additional pressure exerted on the surrounding soil by the high-pressure injected slurry during the grouting reinforcement process); the third is the additional pressure caused by the slurry seepage (the additional pressure caused by the slurry seepage refers to the additional pressure generated in the soil or rock due to the flow and diffusion of the slurry during the grouting operation in the soil or rock, when the slurry penetrates and diffuses through the pores and cracks of the soil or rock). Therefore, by setting the first sensor 52, the second sensor 53 and the third sensor 54, the data can be quantified to provide test data for evaluating the impact of grouting on the pressure around the pipeline 2;Finally, the thrust device composed of the thrust rod 42 and the thrust rod controller 44 is used. The thrust rod controller 44 controls the thrust rod 42 to push the pipeline to move. Therefore, by obtaining the jacking force set in the thrust controller 44, the jacking force data of each jacking pipeline 2 movement can be obtained. For example, the difference between the jacking force data required for jacking without grouting and jacking after grouting is evaluated, thereby completing the evaluation of the drag reduction effect, thereby providing test data for evaluating the effects of different slurry ratios, different grouting hole 31 arrangements, and grouting time on the drag reduction effect. ;

[0055] In summary, this experimental system can effectively simulate the test conditions of grouting in high-pressure water-rich formations through the cooperation of various components such as the test box 1, the pipeline 2, the grouting device 3, the jacking device 4, the monitoring device 5 and the water injection device 6, and provide a comprehensive data basis for the evaluation of the pressure effect of the slurry on the pipeline during the jacking construction process and the influence of different slurry ratios, different grouting hole arrangements and different grouting times on the drag reduction effect.

[0056] In order to make the slurry more fully injected into the fill and to make the collected pressure data of the slurry acting on the pipeline more accurate, in this embodiment, preferably, the pipeline 2 includes a plurality of first pipe sections 21 and second pipe sections 22 connected to each other, and the plurality of first pipe sections 21 and second pipe sections 22 are alternately arranged in sequence. Specifically, the pipeline 2 includes five first pipe sections 21 and five second pipe sections 22. The five first pipe sections 21 include a first pipe section a, a first pipe section b, a first pipe section c, a first pipe section d and a first pipe section e. The five second pipe sections 22 include a second pipe section a. , second pipe section b, second pipe section c, second pipe section d and second pipe section e, by connecting the first pipe section a and the second pipe section a, the second pipe section a and the first pipe section b, the first pipe section b and the second pipe section b, the second pipe section b and the first pipe section c, the first pipe section c and the second pipe section c, the second pipe section c and the first pipe section d, the first pipe section d and the second pipe section d, the second pipe section d and the first pipe section e, and the first pipe section e and the second pipe section e, a layout structure in which a plurality of first pipe sections 21 and second pipe sections 22 are alternately arranged in sequence is formed.

[0057] In this embodiment, the pipeline 2 is firstly composed of a plurality of first pipe sections 21 and a second pipe section 22. Since the structure of the pipeline 2 has a plurality of first pipe sections 21 and a second pipe section 22, and the third sensors 54 are arranged on all the first pipe sections 21, and the grouting holes 31 are arranged on all the second pipe sections 22, the number of the grouting holes 31 and the third sensors 54 can be increased. At the same time, the plurality of first pipe sections 21 and the plurality of second pipe sections 22 are alternately arranged in sequence. Through such an arrangement, the number of the grouting holes 31 and the third sensors 54 can be arranged relatively reasonably on the pipeline 2 of a limited length (that is, as many as possible on the pipeline 2 of a limited length). The number of grouting holes 31 and third sensors 54 can be arranged as much as possible). Firstly, since multiple grouting holes 31 are arranged as much as possible on the limited length pipeline 2, slurry can be injected into the test backfill of the accommodating space from multiple directions through the multiple grouting holes 31, so that the injected slurry is more fully and evenly distributed in the backfill. Secondly, since multiple third sensors 54 are arranged as much as possible on the limited length pipeline 2, multiple groups of pressure data of the slurry acting on the pipeline 2 can be collected through the multiple third sensors 54. The collected pressure data of the slurry acting on the pipeline 2 can be made more accurate through the analysis of the multiple groups of pressure data.

[0058] In order to avoid damage to the test box during the process of the pushing device pushing the pipeline, the present embodiment further includes: a third pipe section 23, one end of the third pipe section 23 is connected to the first pipe section 21 or the second pipe section 22, and the other end is connected to the pushing device 4, and the third pipe section 23 is arranged outside the accommodating space. Specifically, the third pipe section 23 includes four, and the four third pipe sections 23 are respectively a third pipe section a, b, c and d, wherein the third pipe section a is connected to the third pipe section b, the third pipe section b is connected to the first pipe section a, and the third pipe section a and the third pipe section b are located outside the accommodating space, the third pipe section c is connected to the third pipe section d, the third pipe section c is connected to the second pipe section e, and the third pipe section c and the third pipe section d are located outside the accommodating space, and the pushing device 4 is connected to the third pipe section a or the third pipe section d.

[0059] In this example, the pipeline 2 also includes a third pipe section 23, one end of the third pipe section 23 is connected to the first pipe section 21 or the second pipe section 22, and the other end is connected to the pushing device 4. When the pushing device 4 pushes the pipeline 2 to move, the pushing force generated by the pushing device 4 will directly act on the third pipe section 23 first, and then be transmitted to the first pipe section 21 or the second pipe section 22 connected to the third pipe section 23 through the third pipe section 23, thereby driving the pipeline 2 to move. The buffering effect of the third pipe section 23 in the middle avoids the problem that when the pushing device 4 directly applies the pushing force to the first pipe section 21 or the second pipe section 22 arranged in the accommodating space, the pushing force may be dispersed to the test box 1, thereby causing damage to the test box 1.

[0060] In order to make the collected additional pressure data generated by the grouting tight soil and the additional pressure data caused by the slurry seepage more accurate, in this embodiment, preferably, the first sensor 52 includes a plurality of first sensors 52, and the plurality of first sensors 52 are arranged above the pipeline 2, and each of the first sensors 52 is distributed within the range of the additional pressure generated by the grouting tight soil; specifically, the first sensor 52 includes six, and the six first sensors 52 are all arranged in the backfill above the pipeline 2, and each of the first sensors 52 is distributed within the range of the additional pressure generated by the grouting tight soil; the second sensor 53 includes a plurality of second sensors 53, and the plurality of second sensors 53 are arranged above the pipeline 2, and each of the second sensors 53 is distributed within the range of the additional pressure caused by the slurry seepage; specifically, the second sensor 53 includes six, and the six second sensors 53 are all arranged in the backfill above the pipeline 2, and each of the second sensors 53 is distributed within the range of the additional pressure caused by the slurry seepage.

[0061] In this embodiment, multiple first sensors 52 and second sensors 53 are provided. Since multiple grouting holes 31 will inject multiple streams of slurry into the fill during the grouting process, the slurry will generate multiple additional pressures on the fill caused by the grouting pressure-tightening soil body. Therefore, by providing multiple first sensors 52 and limiting the positions of the multiple first sensors 52 to be within the range of the additional pressures generated by the grouting pressure-tightening soil body, the first sensors 52 can collect multiple sets of additional pressure data generated by the grouting pressure-tightening soil body. The collected additional pressure data generated by the grouting pressure-tightening soil body can be made more accurate through the analysis of multiple sets of pressure data. At the same time, since the slurry will also generate multiple additional pressures caused by slurry seepage on the fill, multiple second sensors 53 are provided and limiting the positions of the multiple second sensors 53 to be within the range of the additional pressures caused by the slurry seepage. The collected additional pressure data caused by the slurry seepage can be made more accurate through the analysis of multiple sets of pressure data.

[0062] In order to make the jacking force provided by the jacking device act more evenly on the pipeline, the jacking device 4 further comprises: a flange 41, a reaction wall 43, and one end of the thrust rod 42 is connected to the flange 41 and the other end is connected to the reaction wall 43. Specifically, in order to facilitate multiple jacking and moving of the pipeline, the jacking device 4 includes two groups, the thrust rod 42 of the first group of jacking devices 4 is connected to the third pipe section a, and the thrust rod 42 of the second group of jacking devices 4 is connected to the third pipe section d.

[0063] In this embodiment, one end of the thrust rod 42 is connected to the flange 41, and the other end is connected to the reaction wall 43. Firstly, the reaction wall 43 can provide a fulcrum for the thrust rod 42 to apply the jacking force to the pipeline 2. Secondly, the flange 41 can evenly apply the jacking force generated by the thrust rod 42 to the pipeline 2. Therefore, through the interaction between the reaction wall 43 and the flange 41 on the thrust rod 42, the thrust rod 42 can apply the jacking force to the pipeline 2 more evenly.

[0064] In order to enable the test box to load various equipment used in the test, the present embodiment preferably includes: a bottom plate 11, on which a first side plate 12, a second side plate 13, a third side plate 14 and a fourth side plate 15 connected in sequence are arranged, and the first side plate 12 and the third side plate 14 are arranged oppositely, and the second side plate 13 and the fourth side plate 15 are arranged oppositely; wherein, the first side plate 12 and the third side plate 14 arranged oppositely are respectively provided with mounting holes 17, and the two mounting holes 17 are respectively arranged correspondingly, specifically, the mounting holes 17 arranged on the first side plate 1 The position of the mounting hole 17 on the second side plate 13 corresponds to the position of the mounting hole 17 set on the third side plate 14, that is, the line between the centers of the two mounting holes 17 is located on a horizontal line, or the second side plate 13 and the fourth side plate 15 which are arranged relatively to each other are respectively provided with mounting holes 17, and the two mounting holes 17 are respectively arranged correspondingly. Specifically, the position of the mounting hole 17 set on the second side plate 13 corresponds to the position of the mounting hole 17 set on the fourth side plate 15, that is, the line between the centers of the two mounting holes 17 is located on a horizontal line.

[0065] In this example, firstly, a first side panel 12, a second side panel 13, a third side panel 14 and a fourth side panel 15 which are connected in sequence are arranged on the bottom panel 11, so as to form a accommodating space in the test box 1. The accommodating space can be used to load test fill, various test sensors, etc., and at the same time, corresponding mounting holes 17 are respectively arranged on the relatively arranged first side panel 12 and the third side panel 14 or corresponding mounting holes 17 are respectively arranged on the relatively arranged second side panel 13 and the fourth side panel 15, and the test pipes 2 are respectively passed through the corresponding mounting holes 17 in sequence to complete the installation of the pipes 2 in the accommodating space. Therefore, the loading of various test equipment can be completed by the setting of the structure of the test box 1.

[0066] In order to ensure that the mechanical strength of the test box can meet the requirements for loading and filling soil and facilitate the observation of the internal conditions of the test box, in this embodiment, preferably, the bottom plate 11 is made of steel plate; the first side plate 12 and the third side plate 14 are made of transparent organic glass, and the second side plate 13 and the fourth side plate 15 are made of steel plate; or, the first side plate 12 and the third side plate 14 are made of steel plate, and the second side plate 13 and the fourth side plate 15 are made of transparent organic glass.

[0067] In this example, a bottom plate 11 and side plates made of steel plates are firstly used, and side plates made of transparent organic glass are used at the same time. Since the steel plates and transparent organic glass have good mechanical properties, the accommodation space enclosed by the above materials has good mechanical properties and can meet the requirements of loading fill. Secondly, due to the light-transmitting properties of transparent organic glass, the internal conditions of the accommodation space during the test can be observed through the transparent side plates, such as observing the situation of injecting water into the fill.

[0068] In order to meet the prerequisite test prerequisite of the grouting hole arrangement form, in this embodiment, preferably, there are four grouting holes 31, and the four grouting holes 31 are evenly arranged on the second pipe section 22 along the circumference of the second pipe section 22; or, there are six grouting holes 31, and the six grouting holes 31 are evenly arranged on the second pipe section 22 along the circumference of the second pipe section 22.

[0069] In this embodiment, a plurality of (for example, four or six) grouting holes 31 are provided on the pipeline 2 and are evenly arranged along the circumference of the pipeline 2 , thereby satisfying the test prerequisites for different arrangements of the grouting holes 31 .

[0070] In order to enable the grouting assembly to inject slurry into the grouting hole, the present embodiment further comprises: a grouting pump 33; a grouting pipe 32, and the grouting pump 33 is connected to the grouting hole 31 through the grouting pipe 32.

[0071] In this embodiment, the grouting pipe 32 is connected to the grouting hole 31 , so that the grouting pump 33 can transfer the slurry through the grouting pipe 32 to the grouting hole 31 , and the grouting of the fill is completed through the grouting hole 31 .

[0072] Example 2

[0073] Example 2 provides a test method for evaluating the construction of a pipe jacking in a high-pressure water-rich formation: applied to the test system for evaluating the construction of a pipe jacking in a high-pressure water-rich formation as described in Example 1, the method comprises the following steps:

[0074] Step 1: Fill the accommodating space of the test box 1 with soil and compact it so that the upper surface of the compacted soil is flush with the lower surface of the mounting hole 17; specifically, the plane where the upper surface of the soil and the bottom of the mounting hole are located are located in the same horizontal plane;

[0075] Step 2: Install the pipe 2 in the accommodation space of the test box 1 through the installation hole 17, and connect the pipe 2 to the pushing device 4;

[0076] Step 3: Continue to fill the accommodating space of the test box 1 with soil and compact it, and set the first sensor 52 and the second sensor 53 above the pipeline 2, and connect the first sensor 52, the second sensor 53 and the third sensor 54 to the data acquisition device 51 for electrical signals respectively;

[0077] Step 4: Start the water injection device 6 to inject water into the fill to the designed water level, and record the first data collected by the first sensor 52, the second sensor 53 and the third sensor 54;

[0078] Step 5: without grouting, start the jacking device 4 to push the pipeline 2 to move, and record the first jacking force;

[0079] Step 6: Start the grouting device 3 to inject slurry into the fill soil, and record the second data collected by the first sensor 52, the second sensor 53 and the third sensor 54;

[0080] Step 7: close the grouting device 3, start the jacking device 4 to push the pipeline 2 to move, and record the second jacking force;

[0081] Step 8: Repeat the above steps 1-7 by changing the slurry ratio, grouting hole arrangement and grouting time.

[0082] In this embodiment, the accommodating space in the test box 1 is first filled with backfill, and the pipeline 2 is installed, the pipeline 2 is connected to the jacking device 4, and the first sensor 52, the second sensor 53 and the third sensor 54 are respectively connected to the data acquisition device 51 for electrical signals, and then water is injected into the test backfill in the accommodating space through the water injection device 6 to simulate the environment of high water pressure and water-rich formation, and the first sensor 52 is used to collect the additional pressure data generated by the grouting tight soil for the first time, the second sensor 53 is used to collect the additional pressure data caused by the slurry seepage for the first time, and the third sensor 54 is used to collect the pressure data of the slurry acting on the pipeline 2 for the first time. Secondly, without grouting, the jacking device 4 is started to push the pipeline 2 to move, and the first jacking force data is recorded, and the grouting device 3 is started again to inject slurry into the backfill, and the grouting device 3 is used to inject slurry into the backfill. The first sensor 52 collects the additional pressure data generated by the grouting-tight soil for the second time, the second sensor 53 collects the additional pressure data caused by the slurry seepage for the second time, and the third sensor 54 collects the pressure data of the slurry acting on the pipeline 2 for the second time. After the grouting is completed, the jacking device 4 is started again to jack the pipeline 2, and the second jacking force is recorded. Through the above method steps, the data basis for evaluating the pressure effect of the slurry on the pipeline 2 during the jacking construction process and the effects of different slurry ratios, different grouting hole 31 arrangements, and different grouting times on the drag reduction effect can be collected in this test. Finally, the above steps are repeated by changing parameters such as the slurry ratio, the arrangement of the grouting holes 31, and the grouting time to obtain data from multiple tests, thereby obtaining the optimal slurry ratio, the arrangement of the grouting holes 31, and the grouting time parameters.

[0083] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the rights of the present invention.

Claims

1. A test system for evaluating pipe jacking construction in high water pressure and water-rich formations, characterized in that: include: A test box (1), the test box (1) comprising a containing space; A pipeline (2), the pipeline (2) comprising a first pipe section (21) and a second pipe section (22) connected to each other, the first pipe section (21) and the second pipe section (22) being arranged in the accommodating space; A grouting device (3), the grouting device (3) comprising a grouting assembly and a grouting hole (31) which are interconnected, and the grouting hole (31) is arranged on the second pipe section (22); A pushing device (4), the pushing device (4) comprising a thrust rod (42) and a thrust rod controller (44), the thrust rod (42) and the thrust controller (44) being connected by electrical signals, wherein the pushing device (4) pushes the pipeline (2) to move; A monitoring device (5), the monitoring device (5) comprising a data collector (51), a first sensor (52), a second sensor (53) and a third sensor (54), the data collector (51) being electrically connected to the first sensor (52), the second sensor (53) and the third sensor (54), respectively, wherein the first sensor (52) is arranged in the accommodation space and collects additional pressure data generated by the grout-tight soil body, the second sensor (53) is arranged in the accommodation space and collects additional pressure data caused by grout seepage, and the third sensor (54) is arranged on the first pipe section (21) and collects pressure data of the grout acting on the pipeline; A water injection device (6), wherein the water injection device (6) is communicated with the accommodating space.

2. The test system for evaluating pipe jacking construction in high water pressure and water-rich formations according to claim 1, characterized in that: The pipeline (2) comprises a plurality of first pipe sections (21) and second pipe sections (22) which are connected to each other, and the plurality of first pipe sections (21) and second pipe sections (22) are alternately arranged in sequence.

3. The test system for evaluating pipe jacking construction in high water pressure and water-rich formations according to claim 1, characterized in that: The pipeline (2) also includes: A third pipe section (23), one end of which is connected to the first pipe section (21) or the second pipe section (22), and the other end of which is connected to the pushing device (4), and the third pipe section (23) is arranged outside the accommodating space.

4. The test system for evaluating pipe jacking construction in high water pressure and water-rich formations according to claim 1, characterized in that : The first sensors (52) include a plurality of them, the plurality of the first sensors (52) are arranged above the pipeline (2), and each of the first sensors (52) is distributed within the range of the additional pressure generated by the grout-tight soil body; The second sensors (53) include a plurality of second sensors (53), which are arranged above the pipeline (2), and each of the second sensors (53) is distributed within the range of the additional pressure caused by the slurry seepage.

5. The test system for evaluating pipe jacking construction in high water pressure and water-rich formations according to claim 1, characterized in that: The pushing device (4) further comprises: Flange (41), A reaction wall (43), one end of the thrust rod (42) is connected to the flange (41), and the other end is connected to the reaction wall (43).

6. The test system for evaluating pipe jacking construction in high water pressure and water-rich formations according to claim 1, characterized in that: The test box (1) comprises: A bottom plate (11), wherein a first side plate (12), a second side plate (13), a third side plate (14) and a fourth side plate (15) are sequentially connected and arranged on the bottom plate (11); the first side plate (12) and the third side plate (14) are arranged opposite to each other, and the second side plate (13) and the fourth side plate (15) are arranged opposite to each other; The first side plate (12) and the third side plate (14) that are arranged opposite to each other are respectively provided with mounting holes (17), and the two mounting holes (17) are respectively provided correspondingly, or the second side plate (13) and the fourth side plate (15) that are arranged opposite to each other are respectively provided with mounting holes (17), and the two mounting holes (17) are respectively provided correspondingly.

7. The test system for evaluating pipe jacking construction in high water pressure and water-rich formations according to claim 6, characterized in that: The bottom plate (11) is made of steel plate; The first side panel (12) and the third side panel (14) are made of transparent organic glass, and the second side panel (13) and the fourth side panel (15) are made of steel plates; Alternatively, the first side panel (12) and the third side panel (14) are made of steel plates, and the second side panel (13) and the fourth side panel (15) are made of transparent organic glass.

8. The test system for evaluating pipe jacking construction in high water pressure and water-rich formations according to claim 1, characterized in that: There are four grouting holes (31), and the four grouting holes (31) are evenly arranged on the second pipe section (22) along the circumference of the second pipe section (22); Alternatively, there are six grouting holes (31), and the six grouting holes (31) are evenly arranged on the second pipe section (22) along the circumference of the second pipe section (22).

9. The test system for evaluating pipe jacking construction in high water pressure and water-rich formations according to claim 1, characterized in that: The grouting assembly also includes: Grouting pump (33); A grouting pipe (32), wherein the grouting pump (33) is connected to the grouting hole (31) through the grouting pipe (32).

10. A test method for evaluating pipe jacking construction in high water pressure and water-rich formations, characterized in that: The test system for evaluating pipe jacking construction in high water pressure and water-rich formations as claimed in any one of claims 1 to 9 comprises the following steps: Step 1: Fill the containing space of the test box (1) with soil and compact it so that the upper surface of the compacted soil is flush with the lower surface of the mounting hole (17); Step 2: Install the pipeline (2) in the accommodation space of the test box (1) through the installation hole (17), and connect the pipeline (2) to the pushing device (4); Step 3: Continue to fill the containing space of the test box (1) with soil and compact it, and set a first sensor (52) and a second sensor (53) above the pipeline (2), and connect the first sensor (52), the second sensor (53) and the third sensor (54) to the data acquisition device (51) via electrical signals respectively; Step 4: Start the water injection device (6) to inject water into the fill to the designed water level, and record the first data collected by the first sensor (52), the second sensor (53) and the third sensor (54); Step 5: without grouting, start the jacking device (4) to push the pipeline (2) to move, and record the first jacking force; Step 6: Start the grouting device (3) to inject grout into the fill soil, and record the second data collected by the first sensor (52), the second sensor (53) and the third sensor (54); Step 7: close the grouting device (3), start the jacking device (4) to push the pipeline (2) to move, and record the second jacking force; Step 8: Repeat the above steps 1-7 by changing the slurry ratio, grouting hole arrangement and grouting time.

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