Earth pressure balance shield machine trolley mortar tank translation method

Abstract

The invention relates to an earth pressure balance shield machine trolley mortar tank translation method, in the construction process, a shield machine trolley mortar tank is subjected to inward translation operation through a specific device, so that a shield machine can be smoothly propelled in a narrow station. When translation is needed, firstly, a portal frame supporting structure with a guide rail is installed beside the mortar tank supporting legs, then the original mortar tank supporting legs are dismantled, and original mortar tank supporting points act on the portal frame. And then the mortar tank is moved inwards to a specific position along a guide rail on the portal frame through a chain block, the requirement for the small boundary size is met, and normal propulsion of the shield is ensured. And after shield launching, reverse operation is carried out by adopting the same device and method, and the trolley is restored to the initial position. The method is easy and convenient to operate, safe, reliable and capable of effectively improving the efficiency and adaptability of shield construction in the excessively narrow station environment, and has wide application prospects.

Description

Technical Field

[0001] The present invention relates to a tunnel shield construction method, in particular to a trolley translation and recovery method for achieving normal shield advancement within a small limit size in response to a situation where a station is too narrow and a mortar tank of a shield trolley is too wide. Background Art

[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 shield construction faces narrow stations, a series of problems will arise.

[0003] Generally speaking, the shield trolley, as an important supporting equipment for shield construction, undertakes important functions such as storing mortar, transporting materials, and providing electricity. The shield trolley is mainly composed of multiple parts. Its working principle is to connect with the shield machine and move synchronously with the advancement of the shield machine. During the shield construction process, the shield machine digs the tunnel in the front, while the shield trolley provides various supports in the back. For example, the mortar tank is used to store and supply the mortar required for shield construction to ensure the normal excavation of the shield machine; the transportation part is responsible for transporting the excavated slag out of the tunnel and transporting the materials required 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, while 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 the small boundary 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 construction costs; 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] At present, traditional solutions often have many shortcomings. For example, temporarily removing some equipment such as mortar tanks can solve the space problem to a certain extent, but the removal and reinstallation process is cumbersome, time-consuming and labor-intensive, and may cause damage to the equipment. Or try to change the construction sequence, but this may disrupt the schedule of the entire project and affect the progress of other processes.

[0007] Therefore, in order to ensure the normal advancement of the shield within the small boundary size while ensuring construction efficiency and quality, an innovative technical solution is needed that can move the shield trolley inward and restore it after starting to adapt to the special construction environment of narrow stations. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a method for translating a mortar tank of a trolley of an earth pressure balance shield machine.

[0009] In order to achieve the purpose of the present invention, the technical solution adopted is: a method for translating a mortar tank of a trolley of an earth pressure balance shield machine, characterized in that it includes the following steps:

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

[0011] Step N2: Symmetrically remove a set of bolts connecting the legs of the mortar tank of the shield machine trolley and the frame, and use a hydraulic jack to raise the mortar tank to the set elevation;

[0012] Step N3: After the mortar tank top is raised to the set elevation, a gantry support structure with guide rails is installed next to the mortar tank legs of the shield machine trolley;

[0013] Step N4: After the gantry support structure is fixed, the original mortar tank legs are removed, and the hydraulic jack is retracted so that the guide rail slide on the mortar tank frame falls onto the gantry support structure with the guide rail;

[0014] Step N5: Repeat steps N2 to N4, that is, remove the other pairs of leg bolts and install the corresponding gantry support structure until the original leg supports are replaced with the gantry support structure;

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

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

[0017] Step N8: Remove the lateral walkway frame under the mortar tank legs to meet the small boundary size requirements of the station and ensure the normal advancement of the shield. When the mortar tank of the shield locomotive passes the small boundary size of the station, reset the steps in reverse order.

[0018] As a further improvement of the present invention, in step N2, two 50-ton hydraulic jacks are used to raise the mortar tank to a height of at least 10 cm.

[0019] As a further improvement of the present invention, 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 at intervals and parallel to each other.

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

[0021] As a further improvement of the present invention, in step N4, two 50-ton hydraulic jacks are used to slowly lower the mortar tank.

[0022] As a further improvement of the present invention, H-shaped steel 250×250×9×14 is selected as the gantry support structure, and guide rails are installed on the cross beams of the gantry support structure.

[0023] As a further improvement of the present invention, in step N4, lubricating oil is pre-applied on the contact surface between the guide rail slide groove of the mortar tank and the guide rail on the crossbeam of the gantry support structure.

[0024] As a further improvement of the present invention, in step N6, the gantry support structure with guide rails also includes a limit backrest, which is arranged at both ends of the guide rails on the crossbeam of the gantry support structure to limit the hand winch from pulling the mortar tank beyond the limit.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention provides a method for translating a mortar tank of a trolley of an earth pressure balance shield machine. By welding a guide rail slide on the frame of the mortar tank of the trolley of the shield machine, the height of the mortar tank can be precisely controlled by using a hydraulic jack to lift the mortar tank, thereby ensuring the operating space for installing the gantry support structure. Multiple gantry support structures with guide rails are parallel to each other and arranged at intervals, thereby improving the stability of the support. The guide rail surfaces are on the same horizontal plane, thereby ensuring the smooth 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. Lubricating oil is pre-applied on the contact surface to reduce friction and make translation easier. The setting of the limit backrest effectively prevents the hand winch from pulling the mortar tank beyond the limit, thereby improving the safety of operation.

[0027] The present invention is applicable to 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. Within this small boundary size, it is difficult for the shield trolley to pass or advance normally. In order to meet the normal advancement of the shield within the small boundary size and ensure the construction efficiency and quality at the same time, the present invention adopts an innovative technical solution, which can translate the mortar tank of the shield trolley inward and restore it after starting 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 present invention can be performed in a small space, has low requirements on the construction environment, and the translation steps are simple and convenient, which reduces the construction difficulty. The device used can be constructed and manufactured on site, with low construction risks, can save the time required for translation to a large extent, and has high translation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a flow chart of the steps of the method for translating the mortar tank of the earth pressure balance shield machine trolley of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the mortar tank translation device of the earth pressure balance shield machine trolley of the present invention;

[0031] Figure 3 It is a front view of the earth pressure balance shield machine trolley mortar tank translation device in use of the present invention;

[0032] Figure 4 This is a vertical view of the earth pressure balance shield machine trolley mortar tank translation device in use according to the present invention;

[0033] In the figure: 1. H-shaped steel 250×250×9×14; 2. Stiffening plate; 3. Kama; 4. Rail; 5. Guide rail slide; 6. Fixed channel steel; 7. Backrest; 8. Mortar tank (mortar tank frame); 9. Mortar tank support leg platform. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0035] like Figure 1 As shown, an embodiment of the present invention provides a method for translating a mortar tank of an earth pressure balance shield machine trolley, comprising the following steps:

[0036] Step N1: After the trolley enters the site, the construction personnel need to carefully measure and plan the installation position of the guide rail chute 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 chute at a specific position on the mortar tank frame. During the welding process, parameters such as welding temperature, welding speed and welding current must be strictly controlled to ensure that the welding quality meets the standard requirements.

[0037] Step N2: Construction workers need to remove a set of bolts connecting the legs of the shield machine trolley mortar tank to the frame in a symmetrical manner. Before removing the bolts, the position and number of the bolts must be carefully confirmed and marked to ensure the accuracy of the removal operation. At the same time, safety precautions must be taken to prevent the bolts from accidentally falling and causing injuries during the removal process. Next, prepare the hydraulic jack and place it in a suitable 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, pay close attention to the pressure changes 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 special personnel to monitor and direct the lifting process to prevent unexpected situations. When the mortar tank is raised to the set elevation, it must be fixed and supported in time to ensure its stability and safety at this elevation.

[0038] Step N3: When the mortar tank is successfully lifted to the set elevation, the construction personnel need to quickly install a gantry support structure with a guide rail next to the mortar tank support legs of the shield machine trolley. During the installation process, the flatness and verticality of the guide rail must be ensured to ensure that it can function smoothly. After the installation is completed, the gantry support structure is fully inspected and tested to ensure that it can withstand the weight of the mortar tank and various forces during the construction process.

[0039] Step N4: After the gantry support structure is securely fixed, the construction personnel can proceed to remove the original mortar tank legs. Before removal, it is necessary to carefully confirm the connection method between the legs and the mortar tank to ensure a safe and efficient removal process. At the same time, prepare the necessary tools and equipment. During the removal process, the construction personnel must strictly follow the operating procedures to prevent accidents caused by improper operation. After the removal is completed, slowly retract the hydraulic jack. During the process of retracting the jack, pay close attention to the state of the mortar tank to ensure that it descends smoothly. When the hydraulic jack is fully retracted, the guide rail chute on the mortar tank frame will fall onto the gantry support structure with the guide rail. At this time, check the contact between the guide rail chute and the gantry support structure 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 operate safely and reliably on the new support structure.

[0040] Step N5: Repeat steps N2 to N4, that is, remove the other pairs of leg bolts and install the corresponding gantry support structure. During the installation process, accurately measure the installation position of the gantry support structure to ensure that it is accurately matched with the guide rail slide of the mortar tank frame. Pay special attention to the stability and verticality of the gantry, and use tools such as a level to measure and adjust. When fixing, pay attention to the position accuracy of the guide rail and the firmness of the fixation to avoid loosening or offset of the guide rail during subsequent use. After installing a gantry support structure, check its matching with the mortar tank frame to ensure that the gap between the guide rail slide and the guide rail is uniform and runs smoothly. Then, repeat the same steps to remove the other pairs of leg bolts and install the gantry support structure until all the original leg supports are replaced with the gantry support structure.

[0041] Step N6: Prepare the required backrests and installation tools. Perform a comprehensive inspection of the guide rails on the gantry support structure to ensure that the surface of the guide rails is flat, undamaged and clean, providing good basic conditions for the installation of the backrests. Next, determine the installation position of the backrest on the guide rails according to actual needs. Use measuring tools to perform precise measurements to ensure that the installation position of the backrest is accurate and can meet the requirements of subsequent construction or equipment operation. Then, carefully place the backrest in the predetermined position on the guide rail. Use welding to fix the backrest firmly on the guide rail. During the installation process, ensure that the connection between the backrest and the guide rail is tight and stable, and no looseness or shaking is allowed. After the installation is completed, conduct a comprehensive inspection of the installation of the backrest again. To ensure that the backrest can play the best supporting role on the guide rails of the gantry support structure.

[0042] Step N7: First, select a suitable chain hoist to ensure that its load-bearing capacity can meet the weight requirements of the mortar tank. Perform a comprehensive inspection of the chain hoist to confirm that its components are intact, the chain is not rusted or twisted, and the brake device is sensitive and reliable. Before preparing to move the mortar tank, check the guide rail again to ensure that the guide rail surface is smooth and there are no obstacles that hinder the movement of the mortar tank. At the same time, check the overall stability of the gantry to confirm that it can withstand the various forces during the movement of the mortar tank. The construction personnel stand in a safe position and slowly pull the chain of the chain hoist to make the mortar tank move inward along the guide rail on the gantry. During the movement, keep the movement smooth and slow to avoid violent shaking or impact. Arrange a special person to observe and direct nearby to ensure that the mortar tank moves in the predetermined direction and path. Always pay attention to the working status of the chain hoist, such as the tension of the chain and the connection of the hook. If any abnormality is found, the movement should be stopped immediately for inspection and treatment. As the hand chain hoist is continuously pulled, the mortar tank gradually moves to a specific position. When the mortar tank reaches the specified position, stop pulling the hand chain hoist and fix the mortar tank to ensure its stability at that position. At this point, the horizontal movement of the mortar tank on the shield machine trolley is completed. During the entire process, construction personnel must strictly abide by the safety operating procedures to ensure construction safety.

[0043] Step N8: First remove the lateral walkway frame under the mortar tank legs. This operation is to meet the small boundary size requirements of the station, so as to ensure that the shield can advance normally. After the shield locomotive mortar tank successfully passes the small boundary size of the station, follow the reset steps in reverse order.

[0044] like Figure 2 , 3As shown in , 4, the gantry support structure, that is, a mortar tank translation device of an earth pressure balance shield machine trolley for implementing the method, includes an H-shaped steel (250×250×9×14mm) 1, a stiffening plate 2, a kama 3, a rail 4, a guide rail slide 5, a fixed channel steel 6, and a backrest 7.

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

[0046] H-shaped steel (250×250×9×14mm) 1: As the main load-bearing component of the gantry support structure, H-shaped steel has high strength and rigidity. Its size is 250×250×9×14, which ensures that it can withstand large weight and various forces during the translation of the mortar tank, providing a stable basic support for the entire translation device.

[0047] Stiffening plate 2: Stiffening plates are used to enhance the structural strength and stability of H-shaped steel. Stiffening plates are made of the same steel as H-shaped steel and connected to H-shaped steel by welding. Stiffening plates are set at intervals of 400mm on both sides of H-shaped steel to ensure that H-shaped steel will not be deformed or damaged during the translation of the mortar tank. The shape and size of the stiffening plates match those of H-shaped steel to ensure the tightness and reliability of the connection.

[0048] Kama 3; Kama plays a role of connection and fixation in the translation device. It is made of high-strength steel and has good wear resistance and corrosion resistance. Kama works closely with H-beam, rails and other components to ensure that there will be no loosening or falling off during the translation of the mortar tank. Kama sets a gear at an interval of 300mm on both sides of the rail to ensure that it can effectively play the role of connection and fixation.

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

[0050] Guide rail chute 5: The guide rail chute is installed on the mortar tank frame and used in conjunction with the steel rail to achieve the translation of the mortar tank. The guide rail chute is made of high-strength steel and has good wear resistance and corrosion resistance. The shape and size of the guide rail chute match the steel rail to ensure smooth sliding during translation. The installation position of the guide rail chute is accurate to ensure a close fit with the steel rail without jamming or derailment.

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

[0052] Backrest 7: The backrest is installed on the guide rail to limit the movement range of the mortar tank and ensure that it does not exceed the safety range during the translation process. The backrest is made of high-strength steel and has good wear resistance and corrosion resistance. The backrest adopts a triangular shape and can provide a stable limiting effect. One of the right-angled sides fits tightly with the guide rail (100mm long), and the other right-angled side 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 backrest is accurate to ensure that it can play its due role during the translation of the mortar tank.

[0053] The various components of the above-mentioned earth pressure balance shield machine trolley mortar tank translation device 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 invention has been made into actual samples and tested on site as described in the specification and the illustrations. From the results of the test, it can be proved that the present invention can achieve its intended purpose, and its practical value is beyond doubt. The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention in any form. Any person with ordinary knowledge in the technical field, if it does not depart from the scope of the technical features of the present invention, uses the equivalent embodiments of the technical content disclosed by the present invention to make partial changes or modifications, and does not depart from the technical features of the present invention, all still fall within the scope of the technical features of the present invention.

Claims

1. A method for translating a mortar tank of an earth pressure balance shield machine trolley, characterized in that: The following steps are involved: Step N1: Welding the guide rail groove on the frame of the mortar tank of the shield machine trolley; Step N2: Symmetrically remove a set of bolts connecting the legs of the mortar tank of the shield machine trolley and the frame, and use a hydraulic jack to raise the mortar tank to the set elevation; Step N3: After the mortar tank top is raised to the set elevation, a gantry support structure with guide rails is installed next to the mortar tank legs of the shield machine trolley; Step N4: After the gantry support structure is fixed, the original mortar tank legs are removed, and the hydraulic jack is retracted so that the guide rail slide on the mortar tank frame falls onto the gantry support structure with the guide rail; Step N5: Repeat steps N2 to N4, that is, remove the other pairs of leg bolts and install the corresponding gantry support structure until the original leg supports are replaced with the gantry support structure; Step N6: Install a backrest on the guide rail on the gantry support structure; Step N7: Use a hand chain hoist to slowly move the mortar tank inward along the guide rail on the gantry to a specific position, and the translation of the mortar tank on the shield machine trolley is completed; Step N8: Remove the lateral walkway frame under the mortar tank legs to meet the small boundary size requirements of the station and ensure the normal advancement of the shield. When the mortar tank of the shield locomotive passes the small boundary size of the station, reset the steps in reverse order.

2. The method for translating the mortar tank of an earth pressure balance shield machine trolley according to claim 1 is characterized in that: In step N2, two 50-ton hydraulic jacks are used to raise the mortar tank to a height of at least 10 cm.

3. The method for translating the mortar tank of the earth pressure balance shield machine according to claim 1 is characterized in that In step N3, at least two gantry support structures with guide rails are provided, and at least two gantry support structures with guide rails are arranged at intervals and parallel to each other.

4. The method for translating the mortar tank of an earth pressure balance shield machine trolley according to claim 1 is characterized in that: In step N3, all guide rails are arranged on the crossbeams of the gantry support structure, all guide rail surfaces are on the same horizontal plane, and the guide rail slides on the mortar tank frame of the shield machine trolley can move on the gantry guide rail surface.

5. The method for translating the mortar tank of an earth pressure balance shield machine trolley according to claim 1 is characterized in that: In step N4, two 50-ton hydraulic jacks are used to slowly lower the mortar tank.

6. The method for translating the mortar tank of an earth pressure balance shield machine trolley according to claim 1 is characterized in that: H-shaped steel 250×250×9×14mm is selected as the gantry support structure, and the guide rail is installed on the crossbeam of the gantry support structure.

7. The method for translating a mortar tank of an earth pressure balance shield machine trolley according to claim 1, characterized in that: In step N4, lubricating oil is pre-applied on the contact surface between the guide rail slide groove of the mortar tank and the guide rail on the crossbeam of the gantry support structure.

8. The method for translating the mortar tank of an earth pressure balance shield machine according to claim 1 is characterized in that In step N6, the gantry support structure with guide rails also includes a limit backrest, which is arranged at both ends of the guide rails on the crossbeam of the gantry support structure to limit the hand winch from pulling the mortar tank beyond the limit.

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