Method for lowering a shield tailgate

Abstract

The application discloses a method for lowering a step of a shield rear matching device, and aims to solve the technical problems of the existing rear matching device lowering step, such as falling from the edge of the step and limited installation area of the formal wheel pair. The method comprises the following steps: (1) pouring an arc-shaped guide table of a sinking section; (2) pre-burying a winch fixing part; (3) setting a pre-buried steel plate; (4) fixing a sliding rail; (5) arranging a corresponding pulley block; (6) installing an intermediate box culvert below a connecting bridge, and installing side rails on both sides of the intermediate box culvert; (7) before 2#-5# trailers go down into a well, sliding shoes are arranged at the bottom of the trailers; (8) starting the winch to pull the trailers to translate along the sliding rail; and trailer wheel pairs corresponding to the side rails are arranged at the corresponding positions of the sinking section at the bottom of the trailers. The step lowering method has the advantages of high construction safety, effectively improved construction efficiency, increased trailer wheel pair installation operation space and the like.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of shield construction, in particular to a method for lowering a step of a shield rear supporting device. BACKGROUND

[0002] The shield machine is a comprehensive tunnel excavation device with multiple functions, which integrates all functions such as excavation, earth removal, support, grouting and guidance in the shield construction process. The shield machine is not affected by conditions such as ground traffic, river, navigation, season and climate. The tunneling, earth removal, lining and assembly of the shield machine can be realized automatically, intelligently and informatizedly, and the construction and transportation control is informatized. The shield machine has a faster tunneling speed, higher efficiency and lower construction labor intensity, and is widely used as the preferred equipment in underground traffic engineering and tunnel construction.

[0003] The shield machine mainly comprises a shield main body and a rear supporting device. The shield main body comprises a cutter head, a shield body, a driving device, a segment assembling machine and a soil removal mechanism. The rear supporting device of the shield machine generally comprises a connecting bridge and a plurality of trailers. The function of the rear supporting device is to provide various support for the tunneling of the shield main body, including power, control, grouting, lubrication, spoil conveying, segment transportation and soil improvement. According to the functional requirements, the rear supporting device mainly comprises an electric control system, a hydraulic system, a grouting system, a bentonite system, a foam system, a spoil and segment conveying system and the like.

[0004] When the shield machine starts, in order to meet the requirements of the whole shield hoisting assembly process, and because the rear supporting device comprises a connecting bridge and a plurality of trailers, the rear supporting device needs a certain time to be lowered into the well. In order to speed up the efficiency of starting and lowering into the well and shorten the assembly period of lowering into the well, two shield machine lowering work surfaces are arranged in the construction site, which are the main machine hoisting assembly well mouth and the rear supporting device hoisting assembly well mouth, respectively, and are called the main starting well and the auxiliary starting well. The main starting well and the auxiliary starting well are connected to each other, and the shield machine main body and the rear supporting device are assembled in the main starting well and the auxiliary starting well. However, considering that the connection tunnel between the main starting well and the auxiliary starting well also needs a certain time to be opened, the connection tunnel between the main starting well and the auxiliary starting well is designed to be stepped, the main starting well side is a sinking section, and the auxiliary starting well side is provided with a ladder platform, so as to avoid excavation at the ladder platform and shorten the time.

[0005] When the shield main body part is lowered into the main starting shaft and the auxiliary equipment is lowered into the auxiliary starting shaft, the auxiliary equipment needs to pass the ladder platform with a height difference when moving forward. The inventor knows a mud-water shield starting trailer step-down construction method (CN112502718B), which continuously displaces the shield machine forward until the trailer is displaced to the front temporary wheel located at the edge of the step, stops, and uses a hydraulic cylinder to push the trailer against the step to suspend the front temporary wheel by 20 mm. An adjusting seat, a high support seat, and a front official wheel pair are sequentially installed on the suspended side of the front end of the trailer. The high support seat is installed with the adjusting seat at the upper end and the walking wheel at the lower end. The trailer, the adjusting seat, the high support seat, and the front official wheel pair are connected by bolts. After the bolt connection is completed, the hydraulic cylinder is slowly lowered until the front official wheel pair is on the rail.

[0006] However, the inventor found at least the following technical problems in the process of implementing the technical solutions in the embodiments of the present application: the temporary wheel of the trailer stops running at the edge of the step. Since the official wheel pair is installed in the suspended position in front of the temporary wheel, the temporary wheel needs to be as close to the edge of the step as possible, which may cause the temporary wheel to slide off the edge of the step and the installation area of the official wheel pair is limited, resulting in low installation efficiency of the temporary wheel.

[0007] The information disclosed in this BACKGROUND section is only for the purpose of enhancing the understanding of the background of the present disclosure and should not be considered as admitting or implying in any form that this information constitutes prior art known to those skilled in the art. SUMMARY

[0008] In view of at least one of the above technical problems, the present disclosure provides a shield auxiliary equipment step-down method, which aims to solve the technical problems of existing auxiliary equipment step-down from the edge of the step and limited installation area of the official wheel pair.

[0009] According to one aspect of the present disclosure, a shield auxiliary equipment step-down method is provided for the forward movement of the auxiliary equipment between the ladder platform section and the sinking section between the main starting shaft and the auxiliary starting shaft. The auxiliary equipment includes a 1# trailer, a connecting bridge, and 2#-5# trailers to be sequentially connected. The method includes the following steps:

[0010] (1) Pouring arc-shaped guide platforms on both sides of the sinking section, the arc-shaped platform surface of the arc-shaped guide platform matches the 1# trailer sheave pair, and a certain distance is left between the arc-shaped guide platform and the side wall of the ladder platform section for installing a winch;

[0011] (2) Pre-burying winch front end fixing parts, winch rear end fixing parts, and winch base fixing parts on the sinking section bottom plate between the side wall of the ladder platform section, the side wall of the ladder platform section, and the arc-shaped guide platform;

[0012] (3) At the bottom plate of the sinking section and the arc-shaped guide table and both sides of the bottom plate of the ladder section, a plurality of embedded steel plates are embedded, and the connecting line between the embedded steel plates on both sides is parallel; the distance between the connecting lines between the embedded steel plates on both sides is less than the width of the connecting bridge and / or the trailer, and is not equal to the distance between the wheel pairs at the bottom of the trailer;

[0013] (4) A corresponding winch support frame is arranged between the arc-shaped guide table and the side wall of the ladder section, and is fixedly connected with the front end fixing part of the winch, the rear end fixing part of the winch, and the base fixing part of the winch; the winch is fixed on the winch support frame;

[0014] (5) Corresponding sliding rails are fixed at the embedded steel plates on both sides, and the embedded steel plates and the sliding rails are fixedly connected through support columns;

[0015] (6) After the 1# trailer is lowered into the main starting shaft, a corresponding pulley block is arranged at the corresponding winch, the pulley block includes a first pulley block and a second pulley block, the first pulley block is fixedly connected with the rear end fixing part of the winch arranged at the side wall of the ladder section, the second pulley block is fixedly connected with the tail of the 1# trailer to be towed, a steel wire rope is wound around the pulley blocks, one end of the steel wire rope is fixedly connected with the first pulley block or the second pulley block, and the other end is wound on the winch; the winch is started to tow the tail of the 1# trailer to the corresponding position at the end of the sliding rail;

[0016] (7) A plurality of support wheel groups matched with the sliding rails are arranged at the bottom of the connecting bridge on both sides; after the connecting bridge is lowered into the auxiliary starting shaft, the connection between the second pulley block and the 1# trailer is disconnected, the second pulley block is fixedly connected to the corresponding position of the connecting bridge, and a roller is arranged in the range of the steel wire rope at the corner of the ladder;

[0017] (8) The winch is started to tow the connecting bridge to translate along the sliding rail and be connected with the 1# trailer; an intermediate box culvert is installed below the connecting bridge, and side rails are installed on both sides of the intermediate box culvert;

[0018] (9) Before the 2#-5# trailers are lowered, sliding shoes matched with the sliding rails are fixedly arranged at the front and rear sides of the bottom of the trailers;

[0019] (10) After the 2# trailer is lowered into the auxiliary starting shaft, the connection between the second pulley block and the connecting bridge is disconnected, and the second pulley block is fixedly connected to the corresponding position of the 2# trailer; the winch is started to tow the 2# trailer to translate along the sliding rail and be connected with the connecting bridge; trailer wheel pairs matched with the side rails are installed at the corresponding positions of the sinking section at the bottom of the 2# trailer;

[0020] (11) with the continuous advancement of the shield main body part, the 1# trailer, the connecting bridge and the 2# trailer are driven to advance, and step (10) is repeated to complete the corresponding connection of the 3#-5# trailers and the installation of the trailer wheel pairs.

[0021] In some embodiments of the present disclosure, in the step (1), the arc-shaped guide table arc-shaped table surface is coplanar with the inner ring surface of the shield tunneling machine to-be-assembled segment ring.

[0022] In some embodiments of the present disclosure, in the step (2), the hoist rear end fixing member is arranged at a height higher than the height of the hoist.

[0023] In some embodiments of the present disclosure, in the step (4), the hoist is selected by calculating the maximum friction force , wherein μ is the friction coefficient, m is the mass of the trailer, g is the acceleration of gravity, and α is the initial slope; the required pulling force is calculated according to the maximum friction force, and the required pulling force of the corresponding hoist steel wire rope.

[0024] In some embodiments of the present disclosure, in the step (5), the sliding rail is located at the end position of the side of the arc-shaped guide table, so that the connecting bridge or the 2#-5# trailer does not deviate from the sliding rail when connected to the 1# trailer or each other.

[0025] In some embodiments of the present disclosure, in the step (5), a cross beam is arranged between the support column and the side wall of the corresponding side sinking section, and an inclined brace or a scissor brace is arranged between each support column.

[0026] In some embodiments of the present disclosure, in the step (6), after one end of the steel wire rope is fixedly connected to the second pulley set, the steel wire rope is alternately wound around each pulley of the first pulley set and the second pulley set.

[0027] In some embodiments of the present disclosure, in the step (7), the support wheel set includes a walking wheel set and a support body for fixed connection with the connecting bridge, the walking wheel set includes two walking wheels arranged in front and back for rolling on the sliding rail; the height of the support wheel set is consistent with the distance between the connecting bridge bottom plate and the sliding rail after the connecting bridge is connected to the 1# and 2# trailers.

[0028] In some embodiments of the present disclosure, in the step (7), the roller includes rib plates matched with the corners of the ladder table on both sides, each roller is arranged between the rib plates through bearings, and the connecting line of each roller on the rib plate is arc-shaped.

[0029] In some embodiments of the present disclosure, a blocking rail is arranged at the corresponding position of the slide rail in any one of steps (8), (10) and (11) for connecting the bridge and / or positioning the trailer, and the bottom of the blocking rail includes bolts for clamping the blocking rail on the slide rail.

[0030] The one or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages:

[0031] 1. The slide rail extending from the ladder section to the arc-shaped guide rail at the sunken section, the support wheel set matched with the slide rail, and the slide shoe are adopted, the support of the rear matching trailer is provided through the slide rail at the sunken section, the trailer wheel set is arranged at the sunken section, and the trailer runs on the side rail, so that the rear matching equipment can go down the step, and the problems of inconvenient arrangement, low installation efficiency and safety caused by arranging the wheel set in the limited space at the end of the rear matching equipment in the prior art are avoided.

[0032] 2. The blocking rail is arranged at the corresponding position of the slide rail, the blocking rail is used to position and stop the connecting bridge or the trailer at a specific position on the slide rail, and the vehicle is prevented from sliding along the slide rail with a certain slope.

[0033] 3. The winch is connected with the corresponding rear matching equipment through the pulley block to realize traction, and the pulley block relies on the principle of force saving, so that the traction requirement of the winch is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 FIG. 1 is a sectional view of a ladder-shaped tunnel between a main primary well and an auxiliary primary well in an embodiment of the present application.

[0035] Figure 2 FIG. 2 is a sectional view of a sunken section in an embodiment of the present application.

[0036] Figure 3 FIG. 3 is a cross-sectional view of a ladder-shaped tunnel between a main primary well and an auxiliary primary well in an embodiment of the present application.

[0037] Figure 4 FIG. 4 is a schematic view of the layout of a pulley block when a 1# trailer is pulled in an embodiment of the present application.

[0038] Figure 5 FIG. 5 is a schematic view of the layout and structure of a support wheel set in an embodiment of the present application.

[0039] Figure 6 FIG. 6 is a schematic view of the structure of a roller in an embodiment of the present application.

[0040] Figure 7 FIG. 7 is a schematic view of the structure of a blocking rail in an embodiment of the present application.

[0041] Figure 8It is the installation schematic view of the intermediate box culvert and the side rail in an embodiment of the present application.

[0042] In the above figures, 10 is a sinking section, 11 is a ladder section, 2 is an arc-shaped guide platform, 21 is a front end fixing piece of the winch, 22 is a rear end fixing piece of the winch, 23 is a winch base fixing piece, 3 is a pre-buried steel plate, 4 is a slide rail, 50 is a winch, 51 is a first pulley block, 52 is a second pulley block, 53 is a 1# trailer, 54 is a connecting bridge, 55 is a 2# trailer, 6 is a supporting wheel set, 71 is a rib plate, 72 is a roller, 8 is a blocking rail device, 80 is a blocking rail device bolt, 9 is a slide shoe, 90 is an intermediate box culvert, 91 is a side rail, and 92 is a trailer wheel pair. DETAILED DESCRIPTION

[0043] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified, the "connection" and "coupling" involved in the present application include direct and indirect connections (couplings).

[0044] In order to better understand the technical solutions of the present application, the above technical solutions will be described in detail below in combination with the drawings in the specification and specific embodiments.

[0045] In this example, the shield tunnel is constructed by a 1068 mud-water pressurized balanced shield machine, the excavation diameter is 13.32m, the overall machine length is about 135m, the main machine weight is about 2027T, and the rear supporting equipment weight is about 1119T. The rear supporting equipment is composed of a 1# trailer, a connecting bridge, and 2#-5# trailers connected in sequence. Since the present shield machine is a large-diameter shield machine with a large weight, it needs to be hoisted and assembled in blocks. Due to the complex structure of the shield machine, in order to improve the hoisting and assembly efficiency, a main starting shaft and a vice starting shaft are opened to simultaneously perform hoisting and assembly operations in two working faces, so as to shorten the assembly period. The main starting shaft and the vice starting shaft are connected, but in order to reduce the excavation amount, see Figure 1, therefore, a ladder-shaped connecting tunnel including a sinking section 10 and a ladder section 11 is arranged, and the ladder section is used to reduce excavation and improve efficiency. In this example, the 1# trailer is lowered into the main starting well, and the connecting bridge and the 2#-5# trailers are lowered into the auxiliary starting well. Due to the limitation of the ladder section, when the connecting bridge and the 2#-5# trailers lowered into the auxiliary starting well are moved forward, they need to pass through the gap between the sinking section and the ladder section. Therefore, this example discloses a method for lowering the shield rear supporting equipment step by step, which is used for moving the rear supporting equipment between the ladder section and the sinking section between the main starting well and the auxiliary starting well. The method includes the following steps:

[0046] (1) Pouring arc-shaped guide platforms on both sides of the sinking section, the arc-shaped platform surface of the arc-shaped guide platform is matched with the 1# trailer skew wheel pair, and a certain distance is left between the arc-shaped guide platform and the side wall of the ladder section for arranging winches.

[0047] In this example, the 1# trailer is lowered into the main starting well. After being lowered, it does not affect the lowering of the remaining shield structure at the main starting well. In order to facilitate the fixed connection between the 1# trailer and the connecting bridge in the ladder section 11, the 1# trailer needs to be translated to the sinking section 10. Considering that the 1# trailer is provided with a pair of eight-shaped skew wheels at the bottom, as shown in Figure 2 , arc-shaped guide platforms 2 are poured on both sides of the sinking section 10. In this example, the arc-shaped guide platforms 2 include a top platform surface parallel to the bottom plate of the sinking section and an arc-shaped platform surface matched with the eight-shaped skew wheel pair of the 1# trailer. Considering that the 1# trailer will subsequently move along the inner wall of the tunnel pipe ring laid along with the tunneling of the shield machine main body, the arc-shaped platform surface of the arc-shaped guide platform is arranged to coincide with the inner surface of the pipe ring laid along with the shield machine, so that after the eight-shaped skew wheel pair of the 1# trailer leaves the arc-shaped guide platform, it can smoothly move along the pipe ring. In addition, since the 1# trailer needs to be translated towards the auxiliary starting well after being lowered into the main starting well, and the connecting bridge and the 2#-5# trailers need to be translated towards the main starting well after being lowered into the auxiliary starting well, in order to facilitate the connection between the rear supporting equipment, a corresponding traction equipment needs to be arranged to provide traction in two directions. In this example, winches are arranged at the joint of the ladder section and the sinking section as the traction power source. Considering that the connecting bridge and each trailer have a large weight, two winches are arranged to increase the traction force. In order to realize the reliable fixation of the winches, and considering that the two winches occupy a certain space position, when the arc-shaped guide platforms are poured, the space for arranging the winches is reserved between the arc-shaped guide platforms and the side walls of the ladder section.

[0048] (2) Embedding winch front end fixing members, winch rear end fixing members, and winch base fixing members on the sinking section bottom plate between the side walls of the arc-shaped guide platforms opposite the ladder section, the side walls of the ladder section, and the side walls of the arc-shaped guide platforms and the ladder section.

[0049] Considering the space arrangement of the winch, the space arrangement of the winch is reserved between the side walls of the arc-shaped guide table and the ladder table section. However, in order to increase the reliability of the winch fixation, the winch is fixed with the help of the side walls of the arc-shaped guide table and the ladder table section. See Figure 2 In the present embodiment, the arc-shaped guide table 2 is pre-buried with a winch front end fixing member 21 at the end side wall close to the ladder table section before pouring, and is pre-buried with a winch rear end fixing member 22 at the position corresponding to the rear of the winch on the side wall of the ladder table section. In the present example, a pulley block is used to assist traction, and in order to provide a pulley block fixing point, the height of the winch rear end fixing member 22 is set to be higher than the top of the winch, so as to avoid interference between the traction rigging and the winch, and to affect the traction effect. In addition, see Figure 3 The present example is also pre-buried with a winch base fixing member 23 on the bottom plate of the sinking section between the arc-shaped guide table and the side wall of the ladder table section, and further strengthens the connection between the winch and the bottom plate of the sinking section through the winch base fixing member 23.

[0050] (3) A plurality of pre-buried steel plates are pre-buried at the bottom plate of the sinking section and the arc-shaped guide table and on both sides of the bottom plate of the ladder table section, and the connecting lines between the pre-buried steel plates on both sides are parallel; the distance between the connecting lines between the pre-buried steel plates on both sides is less than the width of the connecting bridge and / or the trailer, and is not equal to the distance between the wheel pairs at the bottom of the trailer.

[0051] In the present embodiment, in order to facilitate the translation of the connecting bridge and the 2#-5# trailer, a sliding rail is arranged on the surface of the ladder table section, so that the connecting bridge and the 2#-5# trailer slide on the sliding rail under the traction of the winch, to achieve the purpose of corresponding connection with the 1# trailer or other rear supporting equipment. Therefore, in order to ensure the stability of the arrangement of the sliding rail, see Figure 3 The pre-buried steel plates 3 are pre-buried on the surface of the ladder table, and the stability of the fixation of the sliding rail 4 is strengthened through the pre-buried steel plates 3. Considering that the use of existing technology will cause the connecting bridge or the 2#-5# trailer to easily slide off at the edge of the ladder table and the space for arranging the wheel pairs is limited, in the present embodiment, the sliding rail 4 is extended, and the pre-buried steel plates 3 are arranged on the top surface of the arc-shaped guide table and the bottom plate between the arc-shaped guide table and the side wall of the ladder table, so as to facilitate the support and fixation of the sliding rail. In addition, since the sliding rail 4 is used for the sliding of the trailer wheel pairs thereon, it is necessary to ensure that the connecting lines between the pre-buried steel plates 3 on both sides are parallel and the distance between the two parallel connecting lines is less than the width of the connecting bridge and the trailer, so as to facilitate the subsequent arrangement of the sliding member corresponding to the sliding rail at the bottom of the connecting bridge or the trailer. Considering that if the sliding member is collinear with the arrangement points of the wheel pairs on both sides of the trailer, it will interfere with the arrangement of the wheel pairs of the trailer, therefore, the distance between the two connecting lines corresponding to the pre-buried steel plates 3 on both sides is not equal to the distance between the wheel pairs at the bottom of the trailer. In the present example, the distance between the pre-buried steel plates 3 on both sides is set to be greater than the distance between the wheel pairs at the bottom of the trailer.

[0052] (4) The fixed corresponding winch support frame is arranged between the arc-shaped guide platform and the side wall of the ladder platform section, and is fixedly connected with the winch front end fixing part, the winch rear end fixing part and the winch base fixing part, and the winch is fixed on the winch support frame.

[0053] Since the winch front end fixing part, the winch rear end fixing part and the winch base fixing part are respectively pre-buried in the winch arrangement space range between the arc-shaped guide platform and the side wall of the ladder platform section, in order to ensure reliable fixing of the winch, in this example, the winch is fixed by the winch support frame which is fixedly welded with the winch front end fixing part, the winch rear end fixing part and the winch base fixing part. And considering that the single weight of the connecting bridge and the trailer is large, a large traction force is required, therefore, in this example, two winches are arranged to serve as the traction power source together, and cooperate with the pulley block to achieve the purpose of saving labor and reducing the load of the winch.

[0054] In terms of the selection of the winch, the winch with appropriate output is selected according to the load calculation and the demand. In this example, the 1# trailer weighs 399T, the initial slope is 25‰, which is about 1.43°, so the maximum friction force wherein μ is the friction coefficient, 0.5 is selected in this example, is the normal pressure of the trailer on the guide platform, therefore, wherein m is the mass of the trailer, g is the acceleration of gravity, and α is the initial slope, so and the required towing force is calculated according to the maximum friction force that is, the towing force generated by the winch needs to be greater than 205.2T, and considering the winch traction force margin, the required tension of the winch steel wire rope wherein 1.5 is the safety factor, and thus that is, the winch needs to have a traction force greater than 309T, and such a large traction force winch will inevitably increase the cost, therefore, in this example, the pulley block is arranged to reduce the output traction force required by the winch according to the pulley block labor-saving principle. In this example, one three-wheel pulley block and one four-wheel pulley block are arranged for each winch, and the pulley block system composed of the winding ropes can reduce the traction force to one eighth. Since the traction force required by the two winches is 309T / 16=20T, 16T winch is selected in this example, and the generated tension F=16*2=32T>20T, therefore, the required tension of the 1# trailer is met. Similarly, the required tension of the connecting bridge and the remaining trailers is calculated and reviewed to determine whether the selected winch meets the traction demand of each supporting equipment. After the winch is selected, it is fixedly connected with the winch support frame, and is symmetrically arranged about the center line of the two side rails, so as to symmetrically provide corresponding traction force by the two winches, and to smoothly slide each supporting equipment on the slide rail.

[0055] (5) Corresponding fixed slide rail at both sides of pre-buried steel plate, and pre-buried steel plate between sinking section and slide rail is fixedly connected through support column.

[0056] The slide rail is arranged at the corresponding pre-buried steel plate, and the line connecting the two slide rails and the two pre-buried steel plates coincides, and the arrangement of the slide rail is stabilized through the pre-buried steel plate. In the ladder section, the slide rail is directly fixedly connected between the pre-buried steel plate; the slide rail in the sinking section has a certain height difference with the pre-buried steel plate in the sinking section, so a support column is arranged between the pre-buried steel plate and the slide rail in the sinking section, and the support column is fixedly connected at both ends with the pre-buried steel plate and the slide rail. Considering that the support column has a certain height, only relying on the limited contact area between the bottom surface of the support column and the pre-buried steel plate, when the load of the later supporting equipment is heavy, the support column will shake or even break, therefore, in this embodiment, a cross beam is arranged between the support column and the side wall corresponding to the sinking section, and the position of the cross beam corresponding to the side wall of the sinking section is also pre-buried with a steel plate, so as to facilitate the fixation of the cross beam; in addition, a diagonal brace is arranged between each adjacent support column by using a channel steel, and in other embodiments, a cross-shaped scissors brace is arranged between each adjacent support column, so as to increase the stability of the support column.

[0057] Since the purpose of arranging the slide rail and extending it to a certain distance in the sinking section is to facilitate the connection between the later supporting equipment and the arrangement of the wheel set, the end position of the slide rail located on the side of the arc-shaped guide table makes the connecting bridge or the 2#-5# trailer not deviate from the slide rail when being connected with the 1# trailer or each other, that is, through the extension of the slide rail, the arrangement of the trailer bottom wheel set is carried out within the range of the sinking section, thereby increasing the operation area of the wheel set arrangement.

[0058] (6) After the 1# trailer is lowered into the main starting shaft, corresponding pulley blocks are arranged at the corresponding winch, the pulley blocks include a first pulley block and a second pulley block, the first pulley block is fixedly connected with the rear end fixing piece of the winch arranged at the side wall of the ladder section, the second pulley block is fixedly connected with the tail of the 1# trailer to be pulled, and a steel wire rope is wound between the pulley blocks; the winch is started to pull the tail of the 1# trailer to the end position corresponding to the slide rail.

[0059] After the slide rail and the winch are arranged, the lowering of the later supporting equipment into the shaft can be carried out. In this example, the lowering of the 1# trailer from the main starting shaft is carried out first, after the 1# trailer is lowered into the shaft, since the subsequent lowering of other shield components into the shaft needs to be carried out at the main starting shaft, and the 1# trailer needs to be connected with the remaining equipment lowered into the shaft from the auxiliary starting shaft, therefore, the winch is used to pull and translate the 1# trailer to the sinking section. In order to reduce the output of the winch, pulley blocks are arranged to assist the winch to pull the equipment, see Figure 4, including a first pulley set 51 and a second pulley set 52, wherein the first pulley set 51 is specifically a three-wheel pulley set, the second pulley set 52 is specifically a four-wheel pulley set, and a lifting lug is welded on a lifting machine rear end fixing member pre-buried on the side wall of the ladder section behind the lifting machine, the first pulley set 51 is connected through a shackle, the second pulley set 52 is fixedly connected with the 1# trailer 53 to be pulled, a steel wire rope is wound between the two pulley sets, in this case, one end of the steel wire rope is fixedly connected with the first pulley set 51, then the steel wire rope is wound between the second pulley set 52 and the first pulley set 51 in turn, and the other end of the steel wire rope is wound on the lifting machine 50, thereby, through the cooperation of the pulley sets, a labor-saving structure is formed. In other embodiments, one end of the steel wire rope is fixedly connected with the second pulley set 52, and the other end is wound on the lifting machine 50, thereby achieving a labor-saving effect to different degrees.

[0060] After the lifting machine is connected with the 1# trailer through the pulley set, the two lifting machines are started at the same time to realize the pulling of the 1# trailer, until the 1# trailer approaches the end of the slide rail and does not interfere with the slide rail.

[0061] (7) A plurality of support wheel sets matched with the slide rail are arranged on both sides of the bottom of the connecting bridge respectively; after the connecting bridge is lowered into the auxiliary starting shaft, the connection between the second pulley set and the 1# trailer is disconnected, the second pulley set is fixedly connected to the corresponding position of the connecting bridge, and a roller is arranged in the range of the steel wire rope at the corner of the ladder.

[0062] After the 1# trailer is lowered into the main starting shaft, the connecting bridge can be lowered into the well, in this case, the connecting bridge is lowered into the auxiliary starting shaft, but considering that the connecting bridge is connected between the 1# trailer and the 2# trailer, the bottom of the connecting bridge is not supported, and the bottom edge of the connecting bridge is not in the same plane as the bottom surface of each trailer, therefore, in this embodiment, a plurality of support wheel sets are arranged on both sides of the bottom of the connecting bridge before the connecting bridge is lowered into the well, and in other embodiments, a pad is arranged on the bottom of the well after the connecting bridge is lowered into the well, and the support wheel set is welded and fixed. Referring to Figure 5 , the support wheel set 6 includes a walking wheel set and a support body for fixedly connecting with the connecting bridge, in this case, the walking wheel set includes two walking wheels, the two walking wheels are arranged in front of and behind each other and matched with the slide rail 4, and run on the slide rail; the top of the two walking wheels is provided with the support body, in this case, four slot steels of the same length are combined in a 2*2 shape and welded to ensure the reliable support performance of the support body, avoid bending deformation caused by the inability to bear the weight of the connecting bridge, and the height of the support wheel set is consistent with the distance between the connecting bridge bottom plate and the slide rail after the connecting bridge is connected with the 1# and 2# trailers, thereby the connecting part between the 1# trailer and the connecting bridge can be accurately and quickly aligned, and the adjustment of the height for alignment operation is avoided.

[0063] After the connecting bridge is connected and the support wheel group runs on the slide rail, the connection between the connecting bridge and the winch is established. Similarly, the connection between the second pulley group and the 1# trailer is disconnected, and the second pulley group is fixedly connected to the tail of the connecting bridge to avoid the problem that when the head of the connecting bridge is connected to the winch, the position of the second pulley group needs to be changed again after the head of the connecting bridge passes the winch so that the winch can pull the connecting bridge to continue moving forward. Then start the winch to pull the connecting bridge between the 1# trailer to align. In this process, since the first pulley group is fixed to the side wall of the ladder section, and the second pulley group is fixed to the connecting bridge at the ladder section, the end of the ladder section interferes with the traction steel wire rope between the pulley groups, causing wear. Therefore, in this example, rollers are provided in the range of the steel wire rope at the corners of the ladder section, as shown in Figure 6 The roller includes two rib plates 71 on both sides matched with the corners of the ladder, and each roller 72 is arranged between the rib plates 71 through bearings. The connecting line of each roller 72 on the rib plate 71 is arc-shaped. In use, the roller is placed under the steel wire rope at the corners of the ladder section. When the winch works to pull, the steel wire rope is taut, the roller is pressed at the corners of the ladder, and the rolling of the roller 72 avoids the wear caused by the interference between the steel wire rope and the corners of the ladder.

[0064] (8) Start the winch to pull the connecting bridge along the slide rail and connect with the 1# trailer. Install the intermediate box culvert under the connecting bridge, and install the side rail on both sides of the intermediate box culvert.

[0065] Start the winch. Under the cooperation of the steel wire rope and the pulley group, the support wheel group runs on the walking wheel of the slide rail to pull the connecting bridge to move forward and connect with the 1# trailer. In order to accurately position the connecting bridge on the slide rail so as to connect with the 1# trailer, a blocking rail device is provided on the slide rail in this example, as shown in Figure 7 The bottom of the blocking rail device 8 is provided with a groove embedded on the slide rail, and bolts 80 are provided on both sides of the groove for fixing the blocking rail device at any position on the slide rail. According to the position of the support wheel group of the connecting bridge, the stopping point of the support wheel group is calculated, and the blocking rail device is fixed at the stopping point. When the connecting bridge stops, it can be directly connected with the 1# trailer without position adjustment, thereby improving the construction efficiency.

[0066] In addition, since the bottom of the tunnel is concave, an inverted arch or an intermediate box culvert is generally provided at the bottom during the construction of the tunnel to provide a horizontal bearing surface for the subsequent installation of rails and the like. Therefore, in this embodiment, the intermediate box culvert is installed under the connecting bridge in sequence as the connecting bridge continuously moves forward with the 1# trailer, and the side rail for moving the 2#-5# trailers is installed on both sides of the intermediate box culvert.

[0067] (9) Before the 2#-5# trailers go down the well, the slide shoes corresponding to the slide rail are fixedly installed on the front and rear sides of the bottom of the 2#-5# trailers.

[0068] Because of the setting of the ladder section, the 2#-5# trailer bottom cannot be installed with wheel pairs, and in order to facilitate the 2#-5# trailer to move forward under the traction of the winch, see Figure 8 , the trailer bottom is provided with a sliding shoe 9 corresponding to the slide rail 4 on both sides, and the trailer can slide on the slide rail 4 through the sliding shoe 9, reducing the friction resistance.

[0069] (10) After the 2# trailer is lowered into the auxiliary starting well, the connection between the second pulley set and the connecting bridge is disconnected, the second pulley set is fixed to the corresponding position of the 2# trailer, the winch is started, the 2# trailer is translated along the slide rail, and is connected with the connecting bridge; the trailer wheel pairs corresponding to the side rail are installed at the corresponding position of the 2# trailer bottom in the sinking section.

[0070] The 2# trailer is lowered into the auxiliary starting well, the sliding shoes 9 on both sides of the trailer bottom are matched with the slide rail 4, and the translation of the connecting bridge is similar. The connection between the second pulley set and the connecting bridge is disconnected, and the second pulley set is fixed to the 2# trailer. The winch is started, and the sliding shoe of the 2# trailer bottom slides along the slide rail under the traction of the winch. In this example, according to the fixed position of the sliding shoe, a slide rail stopper is installed on the slide rail to facilitate the connection and fixation between the 2# trailer and the connecting bridge. After the 2# trailer and the connecting bridge are connected and fixed, the connecting bridge is firmly erected between the 1# trailer and the 2# trailer. With the forward movement of the connecting bridge, the supporting wheel groups of the connecting bridge bottom are removed from the slide rail in turn. With the further forward movement of the connecting bridge with the shield body, the 2# trailer is slid to the sinking section slide rail, see Figure 8 At this time, because the slide rails 4 on both sides support the trailer, the trailer wheel pairs 92 matched with the side rail 91 can be installed at the trailer wheel pair installation point of the sinking section slide rail, avoiding the problem that the trailer needs to be lifted by a hydraulic device for installation of the wheel pairs in the prior art, and avoiding the safety hazard that the trailer may slide off from the ladder section due to the installation of the wheel pairs at the end of the trailer exposed from the ladder section. Through the installed trailer wheel pairs, the 2# trailer continues to run on the side rail 91 on both sides of the intermediate box culvert 90, thereby completing the step-down operation of the 2# trailer.

[0071] (11) With the continuous advancement of the shield main body, the 1# trailer, the connecting bridge and the 2# trailer are driven to advance, and step (10) is repeated to complete the corresponding connection of the 3#-5# trailers and the installation of the trailer wheel pairs.

[0072] Although some preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0073] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the application, the application can be practiced otherwise than as specifically described.

Claims

1. A method for lowering the platform of downstream supporting equipment in a tunnel boring machine (TBM), used for moving downstream supporting equipment between the ladder section and the sinking section between the main launching shaft and the auxiliary launching shaft, wherein the downstream supporting equipment includes trailer #1, a connecting bridge, and trailers #2-#5 to be connected sequentially, characterized in that... Includes the following steps: (1) Cast arc-shaped guide platforms on both sides of the sunken section. The arc-shaped guide platform is matched with the inclined wheel pair of the No. 1 trailer. A certain distance is left between the arc-shaped guide platform and the side wall of the ladder section for installing the winch. (2) The front end fixing component of the winch, the rear end fixing component of the winch, and the base fixing component of the winch are respectively embedded in the side wall of the arc-shaped guide platform relative to the ladder section, the side wall of the ladder section, and the bottom plate of the sunken section between the arc-shaped guide platform and the side wall of the ladder section; (3) Several pre-embedded steel plates are pre-embedded at the bottom plate of the sunken section and the arc-shaped guide platform and on both sides of the bottom plate of the ladder section, and the connecting lines between the pre-embedded steel plates on both sides are parallel; the distance between the connecting lines between the pre-embedded steel plates on both sides is less than the width of the connecting bridge and / or the trailer, and is not equal to the distance between the bottom wheelsets of the trailer. (4) A corresponding winch support frame is fixed between the arc-shaped guide platform and the side wall of the ladder section, and is fixedly connected to the front end fixing part, the rear end fixing part, and the base fixing part of the winch, and the winch is fixed on the winch support frame. (5) Fixed slide rails are respectively fixed at the pre-embedded steel plates on both sides, and the pre-embedded steel plates and slide rails between the sinking sections are fixedly connected by support columns. (6) After the No. 1 trailer is lowered into the main launching shaft, a corresponding pulley block is set up at the corresponding winch. The pulley block includes a first pulley block and a second pulley block. The first pulley block is fixedly connected to the rear end fixing part of the winch located on the side wall of the ladder section. The second pulley block is fixedly connected to the tail end of the No. 1 trailer to be pulled. A steel wire rope is wound between the pulley blocks. One end of the steel wire rope is fixedly connected to the first pulley block or the second pulley block, and the other end is wound on the winch. The winch is started to pull the tail end of the No. 1 trailer to the corresponding position at the end of the slide rail. (7) Several support wheel sets matching the slide rail are respectively set on both sides of the bottom of the connecting bridge; After the connecting bridge is lowered into the auxiliary launching shaft, the connection between the second pulley block and the No. 1 trailer is disconnected, the second pulley block is fixedly connected to the corresponding position of the connecting bridge, and rollers are installed at the corners of the ladder platform within the range corresponding to the wire rope. (8) Start the winch, pull the connecting bridge to move along the slide rail and connect it to trailer No. 1; install the intermediate box culvert under the connecting bridge and install side rails on both sides of the intermediate box culvert; (9) Before the No. 2-5 trailers are lowered into the well, slide shoes corresponding to the slide rails are fixedly installed on the front and rear sides of their bottoms respectively; (10) After the No. 2 trailer is lowered into the auxiliary launching shaft, disconnect the connection between the second pulley block and the connecting bridge, and fix the second pulley block to the corresponding position of the No. 2 trailer; start the winch to pull the No. 2 trailer to move along the slide rail and connect it to the corresponding connecting bridge; install the trailer wheelset corresponding to the side rail at the corresponding position of the bottom of the No. 2 trailer in the sinking section; (11) As the main body of the tunnel boring machine continues to advance, it drives trailer #1, connecting bridge and trailer #2 to advance. Repeat step (10) to complete the corresponding connection of trailers #3-5 and the installation of trailer wheelsets.

2. The method for lowering the shield tunneling equipment onto the platform according to claim 1, characterized in that, In step (1), the arc-shaped guide platform surface is coplanar with the inner ring surface of the tunnel segment ring to be assembled by the tunnel boring machine.

3. The method for lowering the shield tunneling equipment onto the platform according to claim 1, characterized in that, In step (2), the height of the winch rear end fixing component is higher than the height of the winch.

4. The method for lowering the shield tunneling equipment onto the platform according to claim 1, characterized in that, In step (4), the winch is selected: the maximum friction force is calculated. Where μ is the coefficient of friction, m is the trailer mass, g is the acceleration due to gravity, and α is the initial incline; the required towing force is calculated based on the maximum friction. The required tensile strength of the corresponding winch wire rope .

5. The method for lowering the shield tunneling equipment onto the platform according to claim 1, characterized in that, In step (5), the slide rail is located at the end of the arc-shaped guide platform, so that the connecting bridge or trailers #2-#5 do not detach from the slide rail when corresponding to trailer #1 or connected to each other.

6. The method for lowering the shield tunneling equipment onto the platform according to claim 1, characterized in that, In step (5), a crossbeam is provided between the support column and the side wall of the corresponding side sinking section, and diagonal bracing or scissor bracing is provided between each support column.

7. The method for lowering the shield tunneling equipment onto the platform according to claim 1, characterized in that, In step (6), after one end of the wire rope is fixedly connected to the first pulley group or the second pulley group, it is alternately wound around the corresponding pulleys of the first pulley group and the second pulley group.

8. The method for lowering the shield tunneling equipment onto the platform according to claim 1, characterized in that, In step (7), the support wheel set includes a walking wheel set and a support body for fixed connection with the connecting bridge. The walking wheel set includes two walking wheels arranged front and rear for rolling on the slide rail. The height of the support wheel set corresponds to the front and rear of the connecting bridge. After connecting with trailers #1 and #2, the distance between the bottom plate of the connecting bridge and the slide rail is consistent.

9. The method for lowering the shield tunneling equipment onto the platform according to claim 1, characterized in that, In step (7), the roller includes ribs on both sides that match the corners of the platform, and rollers are provided between the ribs through bearings, and the line connecting the rollers on the ribs is arc-shaped.

10. The method for lowering the shield tunneling equipment onto the platform according to claim 1, characterized in that, In steps (8), (10) or (11), a rail stop for connecting the bridge and / or positioning the trailer is provided at the corresponding position of the slide rail, and the bottom sides of the rail stop include bolts for clamping the rail stop onto the slide rail.

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