A rock box device and a tunnel boring machine cutter rock breaking experiment platform

Abstract

The application belongs to the technical field of shield construction, and provides a rock box device and a tunnel boring machine cutter rock breaking experiment platform. The rock box device comprises a bottom plate, a frame body and a support seat. The frame body is arranged above the bottom plate. The support seat is provided with sliding rails and is located below the bottom plate. The bottom plate is connected with a first driving mechanism. The first driving mechanism is used for driving the frame body to move along the sliding rails. The frame body is spliced by multiple layers of rock box frames. The rock box frame comprises two outer frames and two inner frames. The two outer frames are connected by a screw rod and are pulled tight, so that the sample, the inner frame, the outer frame and the bottom plate are connected as a whole. The two inner frames are fixed with exposed steel bars of the sample. The inner frame and the sample are clamped by the outer frame.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shield construction, and particularly relates to a rock box device and a tunnel boring machine cutter rock breaking experiment platform. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The shield construction method has become the most important and most commonly used method in tunnel construction. In the shield construction process, cutter rock breaking is the most important process, and its efficiency directly affects the construction period, cost and even construction safety of the tunnel construction. Therefore, it is necessary to carry out shield cutter rock breaking experimental research according to the actual engineering environment in the early stage of engineering construction, so as to guide the engineering cost budget, on-site tunneling parameter selection and the like.

[0004] The shield cutter rock breaking experiment is mainly to carry out rock breaking research in the laboratory by using a shield cutter under the condition of trying to approach the on-site construction environment. The shield cutter rock breaking mechanism experiment equipment has two difficulties, one is how to simulate the on-site shield cutter action to break rock and collect relevant data, and the other is how to more realistically simulate the geological environment, especially the formation confining pressure, because the confining pressure under different conditions has a great influence on the cutter rock breaking efficiency and rock breaking force.

[0005] The existing shield cutter rock breaking mechanism experiment equipment cannot simulate the geological environment, and has limitations for carrying out shield cutter rock breaking experimental research. In addition, the thrust of the shield cutter is large when breaking rock, which causes great damage to the rock box, resulting in short service life of the rock box, increased experimental cost, and the existing rock breaking equipment rock box ignores the simulation of the strong anchoring working condition of the two ends of the steel bar in the project, reducing the accuracy of the experimental data. SUMMARY

[0006] In order to solve the technical problems in the background art, the present application provides a rock box device and a tunnel boring machine cutter rock breaking experiment platform, which can simulate the breaking of reinforced concrete test environment with multiple cutters and multiple angles, making the experimental data more accurate and reliable.

[0007] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0008] The first aspect of the present application provides a rock box device.

[0009] A rock box device comprises a bottom plate, a frame body and a support seat; the frame body is arranged above the bottom plate; the support seat is provided with a sliding rail and is located below the bottom plate; the bottom plate is connected with a first driving mechanism, and the first driving mechanism is used to drive the frame body to move along the sliding rail;

[0010] The frame body is spliced by multiple rock box frames, the rock box frame comprises two outer frames and two inner frames; the two outer frames are connected by a screw rod and are pulled tight, so that the sample, the inner frame, the outer frame and the bottom plate are connected as a whole; the two inner frames are fixed with exposed steel bars of the sample; the inner frame together with the sample is clamped by the outer frame.

[0011] The rock box device is suitable for rock sample tests of various sizes, can simulate a test environment of breaking reinforced concrete by multiple cutters at multiple angles, makes experimental data more accurate and reliable, and is beneficial to processing and manufacturing and manual operation.

[0012] As an implementation form, the outer frame is directly connected with the bottom plate through bolts, the bolt head is embedded in the bottom plate and is provided with a running gap.

[0013] As an implementation form, the inner frame is installed on both sides of the sample.

[0014] As an implementation form, a reserved hole is arranged on the inner frame, and a steel bar is arranged in the reserved hole.

[0015] As an implementation form, the inner frame is fixed with the steel bar through a bolt.

[0016] The advantage of the above scheme is that the rock box is provided with a steel bar constraint tool, so that the steel bar is not lost after the concrete is broken.

[0017] As an implementation form, the bottom plate comprises an upper steel plate, a lower steel plate and a second driving mechanism, the second driving mechanism is arranged between the upper steel plate and the lower steel plate, and the second driving mechanism is used for adjusting the angle between the cutting surface of the sample and the cutting direction of the cutter.

[0018] The advantage of the above scheme is that various working conditions can be simulated, and the actual rock breaking state of the cutter can be more truly reflected.

[0019] As an implementation form, a slide rail clamping groove is arranged at the bottom of the bottom plate, and the slide rail clamping groove is fixed with the bottom plate through a bolt.

[0020] The advantage of the above scheme is that the sample can be uniformly pushed forward or stressed during the test.

[0021] As an implementation form, a downward protrusion is arranged on one side of the bottom plate, and a bolt hole is reserved.

[0022] The advantage of the above scheme is that the downward protruding bolt hole of the bottom plate can connect the first driving mechanism, so that the test can be smoothly carried out.

[0023] As an implementation form, the bottom of the sample is provided with an adjustable height pad iron.

[0024] The advantage of the above scheme is that the angle adjustment perpendicular to the cutting direction can be realized.

[0025] The second aspect of the present application provides a rock breaking experimental platform for a tunnel boring machine cutter.

[0026] A rock breaking experimental platform for a tunnel boring machine cutter comprises the rock box device as described above, which is arranged below the cutter and connected to the main frame through a sliding rail.

[0027] The beneficial effects of the present application are:

[0028] (1) The rock box device of the present application has a simple structure, including a bottom plate, a frame body and a support seat, and is suitable for rock sample tests of various sizes. The simple device is conducive to processing and manufacturing and manual operation, and can bring great convenience to the popularization of the device.

[0029] (2) The rock box device of the present application increases a steel reinforcement constraint tool at the draw screw, which is composed of two inner frames with bolt fixing holes. The steel reinforcement constraint tool can further strengthen and fix the protruding steel reinforcement of the reinforced concrete sample, effectively avoiding the loss of constraint of the steel reinforcement after the concrete is broken, thereby ensuring the accuracy of the test results and the consistency with the actual working conditions. The hole steel reinforcement constraint tool is designed for reinforced concrete samples to meet the working conditions of reinforced concrete test blocks in addition to rock cutting experiments, thereby widening the application range and test accuracy of the rock box and better meeting the actual working conditions.

[0030] (3) The rock box device of the present application is provided with an adjustable height pad iron at the bottom of the sample, which realizes the angle adjustment perpendicular to the cutting direction. The sample on both sides of the cutter can be adjusted to be "high on the left and low on the right" or "low on the left and high on the right" through the angle and height of the pad iron, thereby simulating the cutting of rock samples under various complex working conditions.

[0031] (4) The rock box device of the present application has two driving mechanisms. One driving mechanism is used to control the relative movement of the rock box and the cutter to realize the cutting rock sample test of the test bench. The other driving mechanism is arranged between the upper and lower steel plates of the bottom plate in the vertical plane to control the inclination angle of the rock sample along the cutting direction of the cutter.

[0032] The advantages of the additional aspects of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and their description serve to explain the present application, and do not constitute an improper limitation of the present application.

[0034] Figure 1It is the whole structure installation schematic view of the rock box device of the present application;

[0035] Figure 2 It is the front structure schematic view of the rock box device of the present application;

[0036] Figure 3 It is the bottom plate structure schematic view of the rock box device of the present application;

[0037] Figure 4 It is the partial enlarged schematic view of the present application;

[0038] Wherein: 1-normal pusher, 2-main frame, 3-horizontal pusher, 4-supporting seat, 5-rock box device, 6-cutter, 501-reserved hole, 502-inner frame, 503-outer frame, 504-bottom plate, 505-hydraulic pusher, 506-rail clamping groove, 507-bolt hole, 508-pull screw reserved hole, 509-pull screw. DETAILED DESCRIPTION

[0039] The present application is further described below in conjunction with the accompanying drawings and examples.

[0040] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0041] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of a feature, step, operation, device, component and / or combination thereof.

[0042] Example 1

[0043] Referring to Figure 1 The present embodiment provides a rock box device, which comprises a bottom plate 504, a frame body and a supporting seat 4; the frame body is arranged above the bottom plate 504; the supporting seat 4 is provided with a slide rail and is located below the bottom plate 504; the bottom plate 504 is connected with a first driving mechanism (such as a horizontal pusher 3, a horizontal hydraulic cylinder, etc.), and the first driving mechanism is used to drive the frame body to move along the slide rail.

[0044] Wherein, the bottom of the bottom plate 504 is provided with a slide rail clamping groove 506, and the slide rail clamping groove 506 is fixed with the bottom plate 504 through a bolt. In this way, it can ensure that the sample is uniformly pushed forward or stressed during the test.

[0045] One side of the base plate 504 has a downward protrusion and a pre-drilled bolt hole 507. This allows the pre-drilled bolt hole 507 on the downward protrusion of the base plate to connect to the first drive mechanism, thus ensuring the smooth progress of the test.

[0046] like Figure 2 As shown, the frame body is assembled from multiple layers of rock box frames. Each rock box frame includes two outer frames and two inner frames (the inner frames can be made of steel plates). The two outer frames 503 are connected and tightened by screws, making the sample, inner frames, outer frames, and base plate a single unit. For example, the baffles of the two outer frames 503 are connected to the base plate 504 by three pairs of screws. The screw heads are embedded in the base plate and have a play gap, which can be adjusted according to the specific experimental conditions. The two outer frames 503 are connected by two pairs of tie rods 509, which serve to fix the sample. The tie rods 509 are set in the tie rod pre-drilled holes 508, which are set on the outer frames 503.

[0047] In the specific implementation process, the inner frame 502 is installed on both sides of the sample. The inner frame 502 is provided with pre-drilled holes 501, and reinforcing bars are inserted into the pre-drilled holes 501. For example... Figure 3 As shown, the two inner frames 502 are fixed to the exposed steel bars of the sample by bolts to prevent the steel bars from losing their restraint after the concrete breaks; the two inner frames 502 together with the sample are strictly clamped by the outer frame 503 to complete the fixation and confining pressure of the sample. In this way, steel bar restraint fixtures are added to the rock box to prevent the steel bars from losing their restraint after the concrete breaks.

[0048] Specifically, multiple slide rails and compression springs are evenly distributed at the bottom of the base plate 504 to ensure the relative displacement movement of the sample and the tool.

[0049] like Figure 2 and Figure 3 As shown, the base plate 504 consists of an upper steel plate, a lower steel plate, and a second driving mechanism (e.g., a hydraulic thruster 505). The second driving mechanism is located between the upper and lower steel plates and is used to adjust the angle between the sample cutting surface and the cutting direction of the tool. This allows for the simulation of various working conditions, more realistically reflecting the actual rock-breaking state of the tool.

[0050] In practice, the bottom of the sample is equipped with an adjustable-height shim. This allows for angle adjustment perpendicular to the cutting direction.

[0051] The working principle of the rock box device described in this embodiment is as follows:

[0052] The inner frame 502 fixes the exposed steel bar part of the sample, the outer frame 503 clamps the sample and the inner frame 502, and adjusts the position of the sample in the horizontal direction, the angle between the cutting surface of the sample and the cutting direction of the cutter, and the angle of the sample perpendicular to the horizontal direction by tightening the screw rod, so as to meet the cutting conditions of the cutter.

[0053] Embodiment two

[0054] The embodiment provides a tunnel boring machine cutter rock breaking experiment platform, which comprises the rock box device as described above, the rock box device is arranged below the cutter, and the rock box device is connected with the main frame through a sliding rail.

[0055] It should be noted that, in addition to the rock box device adopting the structure described in the above embodiment one, other structures of the tunnel boring machine cutter rock breaking experiment platform in the embodiment can adopt existing structures to realize, which will not be described in detail here.

[0056] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rock-breaking experimental platform for tunnel boring machine cutters, characterized in that, The test includes a rock box device, which is positioned below the cutting tool and connected to the main frame of the test bench via a slide rail. The rock box device comprises a base plate, a frame body, and a support base. The frame body is positioned above the base plate. The support base has a slide rail positioned below the base plate. The base plate is connected to a first driving mechanism, which drives the frame body to move along the slide rail. The base plate includes an upper steel plate, a lower steel plate, and a second driving mechanism, which is positioned between the upper and lower steel plates and is used to adjust the angle between the sample cutting surface and the cutting direction of the cutting tool. The frame body is assembled from multiple layers of rock box frames, each including two outer frames and two inner frames. The inner frames are installed on both sides of the sample, and each inner frame has pre-drilled holes through which reinforcing bars are inserted. The two inner frames are fixed to the exposed reinforcing bars of the sample with bolts to prevent the reinforcing bars from losing their restraint after the concrete breaks. The two inner frames, along with the sample, are tightly clamped by the outer frames, completing the fixation and confining pressure of the sample. The two outer frames are connected and tightened by screws, making the sample, inner frames, outer frames, and base plate a unified whole. The baffles of the two outer frames are connected to the base plate by screws, with the screw heads embedded in the base plate and having a play clearance. The two outer frames are connected by tie rods to fix the sample; the tie rods are located in pre-drilled holes on the outer frames.

2. The tunnel boring machine cutter rock-breaking test platform as described in claim 1, characterized in that, The bottom of the base plate is provided with a slide rail slot, which is fixed to the base plate by bolts.

3. The tunnel boring machine cutter rock-breaking test platform as described in claim 1, characterized in that, One side of the base plate has a downward protrusion and a pre-drilled bolt hole.

4. The tunnel boring machine cutter rock-breaking test platform as described in claim 1, characterized in that, The bottom of the sample is equipped with a shim for adjusting the height, so as to adjust the angle perpendicular to the cutting direction.

Images