Earth pressure balance shield machine trolley mortar tank translation method

Abstract

The present application relates to a kind of earth pressure balance shield machine platform trolley mortar tank translation method, in construction process, specific device is used to the inward translation operation of shield trolley mortar tank, so that shield can be smoothly advanced in narrow station.When translation is needed, first, a portal frame support structure with guide rail is installed beside the mortar tank support leg, then the original mortar tank support leg is removed, so that the original mortar tank support point acts on the portal frame.Then use the hoist to move the mortar tank along the guide rail on the portal frame to a specific position, meet the small limit size requirement, ensure that shield is normally advanced.After the shield starts, the same device and method are used for reverse operation to restore the platform car to the initial position.The present application is simple and safe to operate, reliable, can effectively improve the efficiency and adaptability of shield construction in narrow station environment, and has wide application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to a tunnel shield construction method, in particular to a method for translating and restoring a shield trolley to realize normal shield propulsion within a small limit size, aiming at the case that the station is too narrow and the shield trolley mortar tank is too wide. BACKGROUND

[0002] In modern urban rail transit construction, shield construction technology is widely used. However, in the actual construction process, various complex working conditions are often encountered. Among them, when the shield construction faces a narrow station, a series of problems will occur.

[0003] Under normal circumstances, the shield trolley, as an important supporting equipment for shield construction, undertakes important functions such as storing mortar, transporting materials, and providing power. The shield trolley is mainly composed of multiple parts, and its working principle is to move synchronously with the shield machine by connecting with it. During shield construction, the shield machine excavates the tunnel in front, while the shield trolley provides various support behind. For example, the mortar tank is used to store and supply the mortar needed for shield construction to ensure the normal excavation of the shield machine; the transportation part is responsible for transporting the excavated spoil out of the tunnel and transporting the materials needed for construction; the power system provides power for the entire shield construction.

[0004] However, in some specific station designs, due to space limitations, the station is too narrow, and the mortar tank of the shield trolley often has a certain width, which makes it difficult for the shield trolley to pass or advance normally within a small limit size.

[0005] If effective measures are not taken, this situation will seriously affect the progress and quality of shield construction. On the one hand, it may cause the shield to fail to advance smoothly, delay the construction period, and increase the construction cost; on the other hand, it may also pose a potential threat to construction safety, such as damaging equipment or causing structural safety problems during forced advancement.

[0006] Currently, traditional solutions often have many shortcomings. For example, using temporary removal of parts of the mortar tank and other equipment can solve the space problem to some extent, but the removal and reinstallation process is tedious, time-consuming and labor-intensive, and may cause damage to the equipment. Or try to change the construction sequence, but this may disrupt the progress arrangement of the entire project and affect the progress of other procedures.

[0007] Therefore, in order to meet the normal advancement of the shield within a small limit size while ensuring construction efficiency and quality, an innovative technical solution is needed to translate the shield trolley inward and restore it after departure to adapt to the special construction environment of the narrow station. SUMMARY

[0008] The present application provides a kind of earth pressure balance shield machine trolley mortar tank translation method to solve the above technical problems.

[0009] In order to achieve the purpose of the present application, the technical scheme adopted is: a kind of earth pressure balance shield machine trolley mortar tank translation method, characterized by comprising the following steps:

[0010] Step N1: welding guide rail sliding groove on the frame of shield machine trolley mortar tank;

[0011] Step N2: symmetrically remove a group of bolts connecting shield machine trolley mortar tank support leg and frame, and use hydraulic jack to lift the mortar tank to a set height;

[0012] Step N3: after the mortar tank is lifted to the set height, install a gantry support structure with guide rail beside the shield machine trolley mortar tank support leg;

[0013] Step N4: after the gantry support structure is fixed, remove the original mortar tank support leg, retract the hydraulic jack, and make the guide rail sliding groove on the mortar tank frame fall on the gantry support structure with guide rail;

[0014] Step N5: repeat steps N2-N4, i.e. remove other groups of support leg bolts, install corresponding gantry support structures, until the original support legs are replaced by gantry support structures;

[0015] Step N6: install a backrest on the guide rail on the gantry support structure;

[0016] Step N7: use a hand-operated hoist to slowly move the mortar tank along the guide rail on the gantry to a specific position, and the shield machine trolley mortar tank translation is completed;

[0017] Step N8: remove the lateral walkway frame under the mortar tank support leg to meet the station small limit size requirement and ensure normal advancement of the shield, and then reset the reverse sequence operation after the shield machine trolley mortar tank passes through the station small limit size.

[0018] As a further improvement of the present application, in step N2, use 2 50-ton hydraulic jacks to lift the mortar tank to at least 10 cm high.

[0019] As a further improvement of the present application, in step N3, at least two gantry support structures with guide rails are provided, and the at least two gantry support structures with guide rails are arranged in parallel.

[0020] As a further improvement of the present application, in step N3, all guide rails are arranged on the crossbeam of the gantry support structure, and the surfaces of all guide rails are on the same horizontal plane, and the guide rail sliding groove on the shield machine trolley mortar tank frame can move on the gantry guide rail surface.

[0021] As a further improvement of the application, in step N4, the mortar tank is slowly lowered by using two 50-ton hydraulic jacks.

[0022] As a further improvement of the application, H-shaped steel 250*250*9*14 is selected as the gantry support structure, and rails are installed on the top of the beam of the gantry support structure.

[0023] As a further improvement of the application, in step N4, lubricating oil is pre-applied on the contact surface between the mortar tank rail sliding groove and the rail on the top of the beam of the gantry support structure.

[0024] As a further improvement of the application, in step N6, the gantry support structure with rails further includes a limiting abutment, which is arranged at both ends of the rail on the beam of the gantry support structure to limit the mortar tank from being pulled by the chain hoist beyond the limit.

[0025] Compared with the prior art, the application has the following advantages:

[0026] The soil pressure balance shield machine trolley mortar tank translation method of the application can accurately control the lifting height of the mortar tank by welding a rail sliding groove on the frame of the shield machine trolley mortar tank and using a hydraulic jack, and ensures the operation space for installing the gantry support structure. The multiple gantry support structures with rails are arranged in parallel and at intervals, which improves the stability of the support. The rail surfaces are on the same horizontal plane, which ensures the smoothness of the translation of the mortar tank. H-shaped steel 250*250*9*14 is selected as the gantry support structure, which has high strength and good stability. The pre-applied lubricating oil on the contact surface reduces friction and makes the translation easier. The arrangement of the limiting abutment effectively prevents the mortar tank from being pulled by the chain hoist beyond the limit, which improves the safety of the operation.

[0027] The application is suitable for some specific station designs. Due to space limitations, the station is too narrow, and the mortar tank of the shield trolley often has a certain width. In this small limit size, the shield trolley is difficult to pass or advance normally. In order to meet the normal advancement of the shield in the small limit size and ensure the construction efficiency and quality, the application adopts an innovative technical scheme, which can translate the mortar tank of the shield trolley inward and restore it after departure to adapt to the special construction environment of the narrow station, thereby greatly shortening the construction period and saving costs.

[0028] The translation described in the application can be operated in a narrow space, has low requirements for the construction environment, simple and convenient translation steps, and reduces the construction difficulty. The device used can be constructed on site, has low construction risk, can greatly save the time required for translation, and has high translation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1It is the soil pressure balance shield machine trolley mortar tank translation method step flow chart of the present application;

[0030] Figure 2 It is the soil pressure balance shield machine trolley mortar tank translation device structure schematic diagram of the present application;

[0031] Figure 3 It is the soil pressure balance shield machine trolley mortar tank translation device use front view of the present application;

[0032] Figure 4 It is the soil pressure balance shield machine trolley mortar tank translation device use elevation view of the present application;

[0033] In the figure: 1, H-shaped steel 250x250x9x14; 2, stiffened plate; 3, cardama; 4, steel rail; 5, guide rail sliding groove; 6, fixed channel steel; 7, back mountain; 8, mortar tank (mortar tank frame); 9, mortar tank leg platform. DETAILED DESCRIPTION

[0034] The application will be further described in detail below in combination with the accompanying drawings and specific embodiments:

[0035] As Figure 1 shown, the soil pressure balance shield machine trolley mortar tank translation method provided by the embodiment of the present application comprises the following steps:

[0036] Step N1: After the trolley enters the field, the construction personnel need to carefully measure and plan the installation position of the guide rail sliding groove on the mortar tank frame to ensure the accuracy and stability of its installation. Then, professional welders use appropriate welding processes and equipment to start welding the guide rail sliding groove at the specific position of the mortar tank frame. During the welding process, the welding temperature, welding speed and welding current and other parameters are strictly controlled to ensure that the welding quality meets the standard requirements.

[0037] Step N2: The construction personnel need to remove a group of bolts symmetrically connecting the shield machine trolley mortar tank leg and the frame. Before removing the bolts, the position and number of the bolts are carefully confirmed and marked to ensure the accuracy of the removal operation. At the same time, safety protection measures should be taken to prevent the bolts from falling accidentally during the removal process and causing injury. Then, prepare the hydraulic jack and place it in the appropriate position. When placing the hydraulic jack, ensure its stability and reliability to avoid tilting or sliding during use. Then, use the hydraulic jack to slowly raise the mortar tank to the set elevation. During the lifting process, closely monitor the pressure change of the hydraulic jack and the lifting of the mortar tank to ensure that the lifting speed is uniform and stable. At the same time, arrange a person to monitor and command the lifting process to prevent accidents. When the mortar tank is raised to the set elevation, it should be fixed and supported in time to ensure its stability and safety at that elevation.

[0038] Step N3: When the mortar tank is successfully jacked to the set elevation, the construction personnel need to quickly install a gantry support structure with guide rails beside the shield machine trolley mortar tank support legs. During installation, the flatness and perpendicularity of the guide rails must be ensured to ensure their smooth operation. After installation, the gantry support structure is comprehensively inspected and tested to ensure that it can withstand the weight of the mortar tank and various forces during construction.

[0039] Step N4: After the gantry support structure is fixed and stable, the construction personnel can begin to remove the original mortar tank support legs. Before removal, the connection method of the support legs and the mortar tank must be carefully confirmed to ensure safe and efficient removal. At the same time, necessary tools and equipment, etc. are prepared. During the removal process, the construction personnel must strictly follow the operating procedures to prevent accidents caused by improper operation. After removal, the hydraulic jack is slowly retracted. During the retraction of the hydraulic jack, the state of the mortar tank must be closely observed to ensure its smooth descent. When the hydraulic jack is completely retracted, the guide rail sliding groove on the mortar tank frame will fall onto the gantry support structure with guide rails. At this time, the contact between the guide rail sliding groove and the gantry support structure must be checked to ensure that the two are tightly and stably matched. If necessary, appropriate adjustments and reinforcements can be made to ensure that the mortar tank can safely and reliably operate on the new support structure.

[0040] Step N5: Repeat steps N2-N4, i.e. remove the other group of support leg bolts, install the corresponding gantry support structure, and during installation, accurately measure the installation position of the gantry support structure to ensure that it is accurately matched with the guide rail sliding groove of the mortar tank frame. Special attention must be paid to the stability and perpendicularity of the gantry, which can be measured and adjusted using a level and other tools. When fixing, attention must be paid to the positional accuracy of the guide rails and the firmness of the fixing to avoid the guide rails becoming loose or offset during subsequent use. After installing a gantry support structure, check its cooperation with the mortar tank frame to ensure that the gap between the guide rail sliding groove and the guide rail is uniform and smooth. Then, repeat the operation of removing the other group of support leg bolts and installing the gantry support structure according to the same steps until all the original support legs are replaced by gantry support structures.

[0041] Step N6: Prepare the required supports and installation tools. Conduct a thorough inspection of the guide rails on the gantry support structure to ensure that the rail surfaces are smooth, undamaged, and clean, providing a good foundation for the installation of the supports. Then, determine the installation position of the supports on the guide rails according to actual needs. Use measuring tools to make accurate measurements to ensure that the installation position of the supports is accurate and can meet the requirements of subsequent construction or equipment operation. Then, carefully place the supports at the designated position on the guide rails. Use welding fixation to securely install the supports on the guide rails. During installation, ensure that the connection between the supports and the guide rails is tight and stable, and there should be no looseness or shaking. After installation, conduct a thorough inspection of the installation of the supports again to ensure that the supports can play the best supporting role on the guide rails of the gantry support structure.

[0042] Step N7: First, select a suitable hand-operated hoist that can meet the weight requirements of the mortar tank. Conduct a thorough inspection of the hand-operated hoist to confirm that all its parts are in good condition, the chain is free of rust and distortion, and the brake is sensitive and reliable. Before moving the mortar tank, re-inspect the guide rails to ensure that the rail surfaces are smooth and free of obstacles that may hinder the movement of the mortar tank. At the same time, check the overall stability of the gantry to ensure that it can withstand various forces during the movement of the mortar tank. Construction personnel stand in a safe position and slowly pull the chain of the hand-operated hoist to start moving the mortar tank along the guide rails on the gantry. During the movement, keep the action smooth and slow to avoid sudden shaking or impact. Assign someone to observe and direct from the side to ensure that the mortar tank moves in the predetermined direction and path. Always pay attention to the working state of the hand-operated hoist, such as the tension of the chain and the connection of the hook. If any abnormality is found, stop moving immediately and conduct inspection and treatment. As the hand-operated hoist is continuously pulled, the mortar tank gradually moves to a specific position. When the mortar tank reaches the designated position, stop pulling the hand-operated hoist and fix the mortar tank to ensure its stability at that position. Thus, the mortar tank translation of the shield tunneling machine is completed. Throughout the process, construction personnel must strictly follow safety operating procedures to ensure construction safety.

[0043] Step N8: First, remove the lateral walkway frame under the mortar tank support leg. This operation is designed to meet the small limit size requirements of the station to ensure that the shield can advance normally. After the shield tunneling machine mortar tank successfully passes through the small limit size of the station, operate in reverse order according to the reset steps.

[0044] As Figure 2 , 3, 4, a gantry support structure, namely a soil pressure balance shield machine trolley mortar tank translation device for implementing the method, comprising an H-shaped steel (250x250x9x14mm) 1, a stiffened plate 2, a cardama 3, a steel rail 4, a guide rail sliding groove 5, a fixed channel steel 6, a back mountain 7.

[0045] The following is a detailed description of the soil pressure balance shield machine trolley mortar tank translation device:

[0046] H-shaped steel (250x250x9x14mm) 1: H-shaped steel as the main load-bearing component of the gantry support structure, has high strength and stiffness. Its size is 250x250x9x14, which ensures that it can withstand large weight and various forces during the support of the mortar tank translation process, providing stable foundation support for the entire translation device.

[0047] Stiffened plate 2: The stiffened plate is used to enhance the structural strength and stability of the H-shaped steel. The stiffened plate is made of the same steel material as the H-shaped steel and is connected to the H-shaped steel by welding. The stiffened plate is set at an interval of 400mm on both sides of the H-shaped steel to ensure that the H-shaped steel does not deform or be damaged during the translation of the mortar tank. The shape and size of the stiffened plate match the H-shaped steel to ensure the tightness and reliability of the connection.

[0048] Cardama 3: Cardama plays a role in connecting and fixing in the translation device. It is made of high-strength steel and has good wear resistance and corrosion resistance. Cardama tightly cooperates with H-shaped steel, steel rail and other components to ensure that it does not loosen or fall off during the translation of the mortar tank. Cardama is set at an interval of 300mm on both sides of the steel rail to ensure that it can effectively play a role in connecting and fixing.

[0049] Steel rail 4: Steel rail as the track of the mortar tank translation has high flatness and hardness. Steel rail is made of standard railway steel rail or other high-strength steel, its size and specification: weight per meter 43KG / m, rail height 140mm, rail bottom width 114mm, rail head width 70mm, rail waist thickness 14.5mm. Steel rail is firmly fixed on H-shaped steel by welding to ensure that it does not displace or deform during the translation of the mortar tank. At the same time, lubricating oil is pre-applied to the surface of the steel rail to reduce friction and improve the translation efficiency of the mortar tank.

[0050] Guide rail sliding groove 5: The guide rail sliding groove is installed on the mortar tank frame and cooperates with the steel rail to realize the translation of the mortar tank. The guide rail sliding groove is made of high-strength steel and has good wear resistance and corrosion resistance. The shape and size of the guide rail sliding groove match the steel rail to ensure smooth sliding during translation. The installation position of the guide rail sliding groove is accurate to ensure tight cooperation with the steel rail and prevent jamming or derailment.

[0051] Fixed channel steel 6: The fixed channel steel is used to fix the gantry support structure, ensuring the stability of the entire device. The fixed channel steel is made of the same steel material as the H-shaped steel and is connected to the H-shaped steel through welding. The fixed channel steel is arranged on the upper part of the vertical H-shaped steel and there are four of them, to ensure that the entire device does not shake or tilt during the translation of the mortar tank.

[0052] Rely on the mountain 7: The rely on the mountain is installed on the guide rail, used to limit the moving range of the mortar tank, to ensure that it does not exceed the safe range during translation. The rely on the mountain is made of high-strength steel material, with good wear resistance and corrosion resistance. The rely on the mountain adopts a triangular shape, which can provide stable limiting effect. One of the right angles is closely attached to the guide rail (100mm long), and the other right angle is perpendicular to the guide rail (150mm long), to ensure that it can effectively limit the movement of the mortar tank. The installation position of the rely on the mountain is accurate, to ensure that it can play its due role during the translation of the mortar tank.

[0053] The above soil pressure balanced shield machine trolley mortar tank translation device and each component cooperate with each other to realize the safe and efficient translation of the mortar tank, providing a strong guarantee for the construction of the shield machine.

[0054] In summary, the present application has been as described in the specification and drawings, and actual samples have been made and tested in the field. From the effect of the use test, it can be proved that the present application can achieve its intended purpose, and the practical value is not in doubt. The above examples are only used to illustrate the present application conveniently, and do not limit the present application in any form. Any person skilled in the art can make equivalent embodiments by making partial changes or modifications within the scope of the technical features disclosed in the present application, without departing from the technical features of the present application, and the equivalent embodiments still belong to the scope of the technical features of the present application.

Claims

1. A method of translating a soil pressure balanced shield machine trolley mortar tank, characterized by: The method comprises the following steps: Step N1: welding a guide rail groove on the frame of the TBM cart mortar tank; Step N2: symmetrically removing a group of bolts connecting the TBM cart mortar tank support leg and the frame, and lifting the mortar tank to a set height by using a hydraulic jack; Step N3: after the mortar tank is lifted to the set height, a gantry support structure with a guide rail is installed beside the TBM cart mortar tank support leg; Step N4: after the gantry support structure is fixed, the original mortar tank support leg is removed, the hydraulic jack is retracted, and the guide rail groove on the mortar tank frame falls on the gantry support structure with a guide rail; Step N5: repeating steps N2-N4, i.e. removing other groups of support leg bolts, installing corresponding gantry support structures, until the original support legs are replaced by gantry support structures; Step N6: installing a backstop on the guide rail of the gantry support structure; Step N7: slowly moving the mortar tank to a specific position along the guide rail on the gantry by using a hand-operated hoist, and completing the translation of the TBM cart mortar tank; Step N8: removing the lateral walkway frame under the mortar tank support leg to meet the station small limit size requirement and ensure normal advancement of the shield, and then resetting the reverse sequence of operation after the TBM cart mortar tank passes through the station small limit size.

2. The EPB shield machine trolley mortar tank translation method of claim 1, wherein: In step N2, the mortar tank is lifted to at least 10 cm high by using two 50-ton hydraulic jacks.

3. The EPB shield machine trolley mortar tank translation method of claim 1, wherein In step N3, at least two gantry support structures with guide rails are provided, and the at least two gantry support structures with guide rails are arranged in parallel.

4. The EPB shield machine trolley mortar tank translation method of claim 1, wherein: In step N3, all the guide rails are arranged on the cross beam of the gantry support structure, all the guide rail surfaces are on the same horizontal plane, and the guide rail groove on the mortar tank frame of the TBM cart can move on the guide rail surface of the gantry.

5. The EPB shield machine trolley mortar tank translation method of claim 1, wherein: In step N4, the mortar tank is slowly lowered by using two 50-ton hydraulic jacks.

6. The earth pressure balance TBM cart mortar tank translation method according to claim 1, wherein: H-shaped steel 250*250*9*14mm is selected as the gantry support structure, and a guide rail is installed on the upper surface of the cross beam of the gantry support structure.

7. The earth pressure balance TBM cart mortar tank translation method according to claim 1, wherein: In step N4, lubricating oil is pre-applied on the contact surface between the mortar tank guide rail groove and the guide rail on the upper surface of the cross beam of the gantry support structure.

8. The EPB shield machine trolley mortar tank translation method of claim 1, wherein In step N6, the gantry support structure with a guide rail further comprises a limiting backstop, and the limiting backstop is arranged at both ends of the guide rail on the cross beam of the gantry support structure to limit the hand-operated hoist from pulling the mortar tank beyond the limit.

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