Construction method for erecting bridge girder erection machine through tunnel box girder

Abstract

The invention provides a construction method for erecting a tunnel-passing box girder of a bridge girder erection machine, and belongs to the technical field of bridge girder erection machine construction. The construction method comprises the following steps that before the bridge girder erection machine passes through a tunnel, all supporting legs of the bridge girder erection machine are contracted and turned over, so that the width and height of the bridge girder erection machine meet the tunnel passing requirements, and a girder transporting machine is used for carrying the bridge girder erection machine to pass through the tunnel; the bridge girder erection machine is adjusted to a girder erection state after going out of the tunnel; a beam transporting machine is used for feeding beams; a bridge erecting machine is used for erecting beams; the bridge girder erection machine falls a girder, and a support on the box girder is installed in place; adjusting fulcrum counterforce; the bridge girder erection machine moves longitudinally to cross a span, and then the girder transporting machine is repeatedly used for feeding girders and the following steps are repeatedly used for continuous construction; the technical problems that an existing bridge girder erection machine is inconvenient to operate and low in construction efficiency during tunnel passing construction are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge erection machine construction, and in particular relates to a construction method for erecting a box girder for a bridge erection machine passing through a tunnel. Background Art

[0002] A bridge erection machine is a device that places prefabricated box girders on prefabricated bridge piers. A bridge erection machine belongs to the category of cranes because its main function is to lift the box girder, transport it to the location, and then put it down. During the construction process, the bridge erection machine needs to move along the extension direction of the bridge, or longitudinal movement. During the longitudinal movement, it is necessary to achieve the switching of the outriggers, especially the forward switching of the front outriggers. During the switching of the front outriggers, other outriggers, such as auxiliary outriggers, are needed to support the fuselage frame of the bridge erection machine.

[0003] Specifically, during the bridge construction process, it is inevitable to encounter working conditions where tunnels and bridges coexist, and it is necessary to construct the bridge after passing through the tunnel. At this time, the prefabricated box girder and the bridge-building machine need to be transported through the tunnel for construction. Especially when the bridge-building machine is transported through the tunnel, due to the large size of the bridge-building machine itself, it is easy to collide with the tunnel after passing through the tunnel after assembly. However, if the bridge-building machine is disassembled and transported through the tunnel, it is difficult to assemble the bridge-building machine in the narrow space at the end of the tunnel and it is inconvenient to erect the first section of the box girder after passing through the tunnel.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a construction method for erecting a box girder for a bridge erecting machine through a tunnel, so as to solve the technical problems of inconvenient operation and low construction efficiency of the existing construction of a bridge erecting machine through a tunnel.

[0006] In order to achieve the above-mentioned purpose, the construction method of the box girder erection by the bridge erection machine of the present invention provides the following technical solutions:

[0007] A construction method for erecting a box girder for a bridge erecting machine through a tunnel, comprising the following steps:

[0008] Before the bridge erector passes through the tunnel, all the legs of the bridge erector are retracted and turned over to make the width and height of the bridge erector meet the requirements of passing through the tunnel, and the bridge erector is carried by a beam transporter to pass through the tunnel;

[0009] Adjust the bridge erecting machine to the beam erecting state after exiting the tunnel;

[0010] Use beam transport machine to feed beams;

[0011] Bridge erection machine frame beam;

[0012] The bridge erecting machine drops the beam and installs the supports on the box beam in place;

[0013] Adjust the reaction force of the fulcrum;

[0014] The bridge erecting machine moves longitudinally across the span, and then the beam crane is used to feed the beams and the subsequent steps are repeated for continuous construction.

[0015] As a further optimized technical solution, the middle legs of the bridge erecting machine include:

[0016] A connecting beam, wherein two connecting beams are symmetrically arranged on both sides of the bridge erecting machine arm, one end of the connecting beam is hinged to the bridge erecting machine arm, and the other end extends in a direction perpendicular to the bridge erecting machine arm under normal working conditions;

[0017] A column, wherein the column is arranged below the connecting beam, one end of the column is hinged to the connecting beam, and the other end of the column is bent and extended toward the direction close to the bottom of the bridge erecting machine under normal working state;

[0018] The lower cross beam is arranged below the connecting beam, and the two ends of the lower cross beam are respectively detachably connected to a column.

[0019] As a further optimized technical solution, the front legs of the bridge erector include:

[0020] An upper crossbeam, wherein the upper crossbeam is fixedly connected to the arm of the bridge erecting machine;

[0021] A telescopic support column, the top of which passes through the upper crossbeam and slidably cooperates with the upper crossbeam to achieve telescopic extension of the telescopic support column in the height direction;

[0022] A lower column, the top end of which is hinged to the bottom end of the telescopic support column;

[0023] A supporting crossbeam is arranged at the bottom end of the lower column and is fixedly connected to the lower column.

[0024] As a further optimized technical solution, a lifting cylinder is provided at the bottom of the upper cross beam, and the end of the lifting cylinder is fixedly connected to the telescopic support column to drive the telescopic support column to slide along the upper cross beam.

[0025] As a further optimized technical solution, a positioning assembly is provided between the telescopic support column and the upper crossbeam, for limiting the telescopic state of the telescopic support column along the upper crossbeam.

[0026] As a further optimized technical solution, the positioning assembly includes pin holes arranged along the length direction of the telescopic support column, the upper cross beam is provided with positioning holes corresponding to the pin holes, and the positioning assembly also includes a positioning pin, which is used to pass through the positioning hole and the pin hole at the same time.

[0027] As a further optimized technical solution, the tunneling step includes:

[0028] Before the tunnel entrance, support the front legs, rear legs and rear auxiliary legs of the bridge erector;

[0029] Remove the lower cross beam of the middle leg, and transport the removed lower cross beam to the front end of the bridge erecting machine arm through the front transport trolley of the bridge erecting machine;

[0030] The rear transfer trolley of the bridge erecting machine moves to the front end of the arm of the bridge erecting machine;

[0031] The rear legs are flipped upward;

[0032] The beam transporter enters under the bridge erecting machine;

[0033] Raise the carriage on the top of the beam transporter until it contacts the bottom surface of the arm of the bridge erecting machine;

[0034] The rear transfer trolley moves to the rear outrigger, the rear auxiliary outrigger is folded upward, the telescopic support column of the front outrigger is retracted upward, and the lower column is folded forward;

[0035] The far end of the connecting beam of the middle leg is folded toward the direction close to the bridge erecting machine, and the bottom end of the column of the middle leg is folded upward;

[0036] Adjust the bracket on the beam transporter to retract downward until the top of the bridge erecting machine is lower than the height of the tunnel;

[0037] The beam transporter carries the bridge erecting machine through the tunnel.

[0038] As a further optimized technical solution, the steps of adjusting the bridge erection machine to the bridge erection state after passing through the tunnel include:

[0039] The beam transporter carries the bridge erecting machine to the tunnel entrance abutment, and the front end of the bridge erecting machine extends out of the tunnel exit;

[0040] Flip the front legs of the bridge erector into position and support them on the abutments;

[0041] Fold down the rear auxiliary legs and provide support;

[0042] The rear transfer trolley runs to the front end of the bridge erecting machine;

[0043] Place the lower crossbeam of the middle leg on the abutment;

[0044] The beam transporter exits;

[0045] The rear legs flip down and prop into place;

[0046] The front transfer trolley and the rear transfer trolley run to the tail of the bridge erecting machine;

[0047] The rear auxiliary legs are folded upwards;

[0048] The bridge erecting machine moves forward as a whole until the middle leg passes through the tunnel to the lower crossbeam position on the abutment;

[0049] Lift the entire bridge erecting machine upwards by a set distance until the middle outrigger can be fully extended;

[0050] Fold the connecting beam of the middle leg and the column into place;

[0051] Install the lower crossbeam of the middle leg;

[0052] Move the front legs of the bridge erecting machine forward and support them on the piers near the tunnel entrance;

[0053] The front transfer trolley and the rear transfer trolley move forward to the beam taking position and flip the rear outriggers upward;

[0054] The bridge-erecting machine is in a state of waiting to erect beams at the exit of the tunnel.

[0055] As a further optimized technical solution, the steps for erecting the box girder after passing the tunnel include:

[0056] Beam transport machine transports beams;

[0057] The bridge erecting machine is supported by the front and middle legs, and the rear legs are folded upward and attached to the bottom of the machine arm, in a state of waiting for beam erection. The beam transport machine feeds the beam into the bridge erecting machine;

[0058] A trolley is used to transport beams in front of the bridge erecting machine;

[0059] The transport trolley and beam transport machine in front of the bridge erection machine synchronously drag the beam into place;

[0060] The bridge erecting machine is followed by a trolley to fetch the beams, and the beam transport machine returns to the beam yard;

[0061] The front transfer trolley and the rear transfer trolley work together to move the beam into place;

[0062] The beams are in place.

[0063] As a further optimized technical solution, the beam transport machine is provided with an automatic driving system to prevent the box beam and the bridge erecting machine from colliding with the tunnel when the beam is transported and the bridge erecting machine is transported through the tunnel.

[0064] Beneficial effect: By using the technical solution of the present invention, all the legs of the bridge-erecting machine are folded and flipped before the bridge-erecting machine passes through the tunnel so that the width and height of the bridge-erecting machine meet the requirements for passing through the tunnel. The bridge-erecting machine can be carried through the tunnel by a beam transporter without having to disassemble the machine for transportation. At the end of the tunnel, the bridge-erecting machine can be put into a bridge-erecting state after relevant operations on the bridge-erecting machine, which facilitates the subsequent smooth bridge-erecting at the rear side of the tunnel. Compared with the prior art of assembling the bridge-erecting machine in the narrow space inside the end of the tunnel, the operation is more convenient and the operating efficiency is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0066] Figure 1 A flowchart of an embodiment of the present invention;

[0067] Figure 2 A schematic diagram of the coordination structure of a bridge erecting machine and a beam transporting machine according to an embodiment of the present invention;

[0068] Figure 3 A schematic diagram of a bridge erecting machine in an embodiment of the present invention showing a state in which the legs are deployed;

[0069] Figure 4 It is a schematic diagram of the supporting legs of a bridge erecting machine in a retracted state according to one embodiment of the present invention;

[0070] Figure 5 A schematic diagram of the front legs of a bridge erecting machine in a main view and a side view according to an embodiment of the present invention;

[0071] Figure 6 A schematic diagram of the bending of the front legs of a bridge erecting machine according to an embodiment of the present invention;

[0072] Figure 7 The state diagram of the bridge erecting machine according to one embodiment of the present invention is shown in FIG. Figure 1 ;

[0073] Figure 8 The state diagram of the bridge erecting machine according to one embodiment of the present invention is shown in FIG. Figure 2 ;

[0074] Fig. 9 The state diagram of the bridge erecting machine according to one embodiment of the present invention is shown in FIG. Figure 3 ;

[0075] Fig.10 Schematic diagram of a bridge erecting machine according to an embodiment of the present invention being adjusted to a beam erecting state after passing through Figure 1 ;

[0076] Fig.11 Schematic diagram of a bridge erecting machine according to an embodiment of the present invention being adjusted to a beam erecting state after passing through Figure 2 ;

[0077] Fig.12 Schematic diagram of a bridge erecting machine according to an embodiment of the present invention being adjusted to a beam erecting state after passing through Figure 3 ;

[0078] Fig.13 Schematic diagram of a bridge erecting machine according to an embodiment of the present invention being adjusted to a beam erecting state after passing through Figure 4 ;

[0079] Fig.14 Schematic diagram of a bridge erecting machine according to an embodiment of the present invention being adjusted to a beam erecting state after passing through Figure 5 ;

[0080] Fig.15 Schematic diagram of a bridge erecting machine according to an embodiment of the present invention being adjusted to a beam erecting state after passing through Figure 6 ;

[0081] Fig.16 Schematic diagram of a bridge erecting machine according to an embodiment of the present invention being adjusted to a beam erecting state after passing through Figure 7

[0082] Fig.17 Schematic diagram of a bridge erecting machine according to an embodiment of the present invention being adjusted to a beam erecting state after passing through Figure 8 .

[0083] In the figure: 100, bridge erecting machine; 110, middle outrigger; 111, connecting beam; 112, column; 113, lower beam; 120, machine arm; 130, front outrigger; 131, upper beam; 132, telescopic support column; 133, lower column; 134, supporting beam; 135, connecting beam; 136, lifting cylinder; 137, pin hole; 138, positioning pin; 140, rear outrigger; 150, rear auxiliary outrigger; 160, front transfer trolley; 170, rear transfer trolley; 180, front auxiliary outrigger; 200, beam transport machine; 210, pack frame; 300, tunnel; 400, abutment; 500, bridge pier. DETAILED DESCRIPTION

[0084] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0085] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0086] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0087] like Figure 1 As shown, the present invention provides a construction method for erecting a box girder through a tunnel by a bridge erecting machine, comprising the following steps:

[0088] S1. Before the bridge erecting machine 100 passes through the tunnel, all legs of the bridge erecting machine 100 are retracted and flipped so that the width and height of the bridge erecting machine 100 meet the requirements for passing through the tunnel, and the beam transporting machine 200 is used to carry the bridge erecting machine 100 through the tunnel.

[0089] like Figure 2-4 As shown, in this embodiment, the middle leg 110 of the bridge-building machine 100 is arranged near the middle of the arm 120 of the bridge-building machine 100, and the middle leg 110 includes a connecting beam 111, a connecting beam 111 and a lower cross beam 113.

[0090] Two connecting beams 111 are symmetrically arranged on both sides of the arm 120 of the bridge erecting machine 100, one end of the connecting beam 111 is hinged to the arm 120 of the bridge erecting machine 100, and the other end of the connecting beam 111 extends in a direction perpendicular to the arm 120 of the bridge erecting machine 100 under normal working conditions. The purpose of the connecting beam 111 being hinged to the arm 120 is to enable the end of the connecting beam 111 away from the arm 120 to rotate toward the side close to the arm 120.

[0091] The column 112 is arranged below the connecting beam 111. One end of the column 112 is hinged to the connecting beam 111, and the other end is bent and extended toward the direction close to the bottom of the bridge erecting machine 100 under normal working conditions. The purpose of hinged connection between the column 112 and the connecting beam 111 is to realize that the bottom end of the column 112 can be rotated and folded upwards. In this way, the rotation and folding of the column 112 and the connecting beam 111 can fully reduce the space occupied by the middle leg 110. The specific condition of the middle leg 110 after fully folding is as follows: Figure 4 As shown, it is convenient for the bridge erecting machine 100 to enter the tunnel 300 .

[0092] The lower cross beam 113 is arranged below the connecting beam 111 , and the two ends of the lower cross beam 113 are respectively detachably connected to a column 112 . When the connecting beam 111 and the columns 112 are fully extended, the lower cross beam 113 is installed at the bottom ends of the two columns 112 to further increase the supporting performance of the middle leg 110 .

[0093] like Figure 5 , Figure 6 As shown, the front support leg 130 of the bridge-building machine 100 is arranged at a position close to the front end of the arm 120 of the bridge-building machine 100, and the front support leg 130 includes an upper beam 131, a telescopic support column 132, a lower column 133 and a support beam 134.

[0094] The upper cross beam 131 is fixedly connected to the arm 120 of the bridge erecting machine 100 .

[0095] The top of the telescopic support column 132 passes through the upper crossbeam 131 and slides with the upper crossbeam 131 to achieve the telescopic support column 132 in the height direction. In order to facilitate the telescopic support column 132 to slide along the upper crossbeam 131, a lifting cylinder 136 is provided at the bottom of the upper crossbeam 131, and the end of the lifting cylinder 136 is fixedly connected to the telescopic support column 132, which is used to drive the telescopic support column 132 to slide along the upper crossbeam 131. Specifically, during the telescopic process, the position can be limited by a positioning assembly arranged between the telescopic support column 132 and the upper crossbeam 131, thereby ensuring the stability of the position state of the telescopic support column 132 after the telescopic adjustment along the upper crossbeam 131. In this embodiment, the positioning assembly includes a pin hole 137 arranged along the length direction of the telescopic support column 132, and a positioning hole corresponding to the pin hole 137 is provided on the upper crossbeam 131. The positioning assembly also includes a positioning pin 138, and the positioning pin 138 is used to pass through the positioning hole and the pin hole 137 at the same time.

[0096] The top of the lower column 133 is hinged to the bottom of the telescopic support column 132 through a connecting beam 135. Specifically, the bottom of the telescopic support column 132 is fixedly connected to the connecting beam 135, so that the bottom of the lower column 133 can be folded and retracted toward the side close to the machine arm 120.

[0097] The supporting cross beam 134 is disposed at the bottom end of the lower column 133 and fixedly connected to the lower column 133 , and is used to increase the area of ​​the front legs 130 contacting the ground, thereby ensuring the overall stability of the front legs 130 when supporting.

[0098] In addition, the arm 120 of the bridge crane 100 usually also has a front auxiliary support leg 180 located at the front end of the front support leg 130, a rear support leg 140 arranged near the rear end of the arm 120, and a rear auxiliary support leg 150 arranged on the rear side of the rear support leg 140.

[0099] like Figure 7-9 As shown, the specific steps of the bridge erection machine 100 passing through the tunnel include:

[0100] First, before the entrance of the tunnel 300, the front legs 130, rear legs 140 and rear auxiliary legs 150 of the bridge erecting machine 100 are supported. The lower cross beam 113 of the middle leg 110 is removed, and the removed lower cross beam 113 is transferred to the front end of the arm 120 of the bridge erecting machine 100 by the front transfer trolley 160 of the bridge erecting machine 100. The rear transfer trolley 170 of the bridge erecting machine 100 runs to the front end of the arm 120 of the bridge erecting machine 100. After the rear leg 140 is flipped upward, the beam transporting machine 200 enters under the bridge erecting machine 100. Then the carriage 210 on the top of the beam transporting machine 200 is raised to contact the bottom surface of the arm 120 of the bridge erecting machine 100. The rear transfer trolley 170 runs to the rear leg 140, the rear auxiliary leg 150 is folded upward, the telescopic support column 132 of the front leg 130 is retracted upward, and the lower column 133 is folded forward. After the above operations are completed, the assembly state of the bridge erecting machine 100 and the beam transporting machine 200 is as follows: Figure 7 shown.

[0101] Then, the far end of the connecting beam 111 of the middle leg 110 is folded toward the bridge erecting machine 100, and the bottom end of the column 112 of the middle leg 110 is folded upward. The bracket on the beam transporting machine 200 is adjusted to be retracted downward until the top of the bridge erecting machine 100 is lower than the height of the tunnel 300. The adjusted state is as follows Figure 8 shown.

[0102] Finally, if Fig. 9 As shown, the beam transport machine 200 carries the bridge erecting machine 100 through the tunnel 300 .

[0103] S2. The bridge erecting machine 100 is adjusted to the beam erecting state after exiting the tunnel 300, ie, aligned at the bridgehead;

[0104] like Figure 10-17 As shown, the steps of adjusting the bridge erecting machine 100 to the bridge erecting state after passing through the tunnel include:

[0105] First, the beam transporter 200 carries the bridge erecting machine 100 to the abutment 400 at the tunnel 300, and the front end of the bridge erecting machine 100 extends out of the tunnel 300. Fig.10 shown.

[0106] like Fig.11 As shown, the front legs 130 of the bridge erecting machine 100 are flipped into place and supported on the abutment 400 .

[0107] The rear auxiliary support leg 150 is folded down and supported. The rear transfer trolley 170 runs to the front end of the bridge erection machine 100. The lower cross beam 113 of the middle support leg 110 is placed on the abutment 400. Then, the beam transport machine 200 withdraws, as shown in FIG. Fig.12 shown.

[0108] Afterwards, if Fig.13 As shown, the rear legs 140 are flipped downwardly and supported in place.

[0109] The front transfer trolley 160 and the rear transfer trolley 170 are moved to the rear of the bridge erecting machine 100. The rear auxiliary support leg 150 is folded upward. The bridge erecting machine 100 is moved forward longitudinally as a whole until the middle support leg 110 passes through the tunnel 300 to the position of the lower cross beam 113 on the abutment 400. Fig.14 shown.

[0110] like Fig.15 As shown, the bridge erecting machine 100 is lifted upward as a whole by a set distance until the middle leg 110 can be fully extended; then the connecting beam 111 and the column 112 of the middle leg 110 are folded into place; and then the lower cross beam 113 of the middle leg 110 is installed.

[0111] like Fig.16 As shown, the front legs 130 of the bridge erecting machine 100 are longitudinally moved forward and supported on the pier 500 near the tunnel 300 entrance, that is, the pier 500 receives the front legs 130 of the bridge erecting machine 100;

[0112] like Fig.17 As shown, the front transfer trolley 160 and the rear transfer trolley 170 move forward to the beam taking position, and the rear support leg 140 is turned upward. The bridge erecting machine 100 is in a state of waiting for beam erection at the exit of the tunnel 300.

[0113] S3. Use beam transporter 200 to feed beams.

[0114] Specifically, before the beam transport machine 200 feeds the beams, preparatory work needs to be done first, including the installation of supports for the box beams in the beam yard.

[0115] The connection between the support and the bottom surface of the box girder is installed on the beam storage platform in the beam yard. During the installation process, the construction should be carried out in accordance with the support installation design requirements.

[0116] After that, the beam is lifted by using a beam lifting machine. The beam lifting machine lifts the box beam at a low gear on the beam storage platform. When the box beam leaves the beam storage platform for about 100 mm, it stops for 5 minutes and then drops to the beam storage platform. This is repeated 3 times to check the braking performance. After meeting the requirements, the two beam lifting machines lift the box beam at the same time.

[0117] After the beam lifting machine lifts the box beam onto the beam transport machine, the beam transport machine starts to transport the beam.

[0118] Afterwards, the beam transporter transports the box beam to the bridge erecting machine 100 to complete the beam feeding.

[0119] S4. Bridge erecting machine erects 100 beams.

[0120] The steps for erecting the box girder after passing the tunnel include:

[0121] First, the beam transporter 200 completes the beam feeding action by transporting the beam. The front legs 130 and the middle legs 110 of the bridge erecting machine 100 are supported, and the rear legs 140 are folded upward and attached to the bottom of the machine arm 120, and are in a state of waiting for beam erection. The beam transporter 200 feeds the beam into the bridge erecting machine 100.

[0122] Afterwards, the lifting device on the front transfer trolley 160 of the bridge erecting machine 100 retrieves the box beam, and the front transfer trolley 160 of the bridge erecting machine 100 and the beam transporting machine 200 synchronously drag the beam into place.

[0123] The bridge erecting machine 100 is followed by the transport trolley 170 to take the beams, and the beam transporting machine 200 returns to the beam yard.

[0124] The front transfer trolley 160 and the rear transfer trolley 170 jointly lift the beam and move it to the position where the box beam needs to be installed, and then drop the beam into place.

[0125] S5. The bridge-erecting machine 100 drops the beam and installs the supports on the box beam in place.

[0126] The specific steps of beam dropping are as follows:

[0127] The front transfer trolley 160 and the rear transfer trolley 170 are started to smoothly drop the beams at a low speed of 0.25 m / min to ensure that the beam dropping force of the bridge erecting machine is stable.

[0128] When the beam is 500 mm away from the top surface of the support pad stone, stop dropping the beam, install the support lower base plate sleeve and anchor bolts, and then start the winches on the front transfer trolley 160 and the rear transfer trolley 170 to drop the beam at a low speed.

[0129] When it is about 200mm away from the top surface of the 500-support pad stone of the bridge pier, use a plumb line to guide, monitor and check the displacement of the center of the bearing; adjust the cross-line error of the bearing, and continue to drop the beam after the cross-line error is adjusted.

[0130] When it is about 50mm away from the top surface of the supporting cushion stone of pier 500, the longitudinal and transverse movement devices of the bridge erection machine 100 are used to slightly adjust the position of the box girder, reserve the expansion joint of the bridge, accurately align the box girder and the support, and then start the winch to drop the beam at a low speed to the jack on one side of the support to press the pier 500.

[0131] Finally, use the level to control the height difference of the top surface of the jack to complete the beam drop.

[0132] S6. Adjust the fulcrum reaction force.

[0133] After the beam is dropped, the stress state of the jacks near each support is adjusted to make the forces of each jack balanced. According to the principle of action and reaction, the box beam can also reach a balanced state. Then the supports on the box beam are connected with the bridge pier 500 by pouring.

[0134] The specific pouring steps are as follows:

[0135] The supporting stones of pier 500 are roughened and a prefabricated steel formwork is used for the grouting formwork.

[0136] Install the grouting template. The grouting template uses a prefabricated steel template and a 4mm thick foam leak-proof strip is set on the bottom of the template.

[0137] Then soak the surface of the supporting stone with water to prevent water from accumulating on the surface.

[0138] Pour the stirred material in, ensuring that the introduced gas can escape freely. When grouting the base plate, maintain sufficient pressure to allow the grouting material to flow.

[0139] Use gravity grouting method (grouting height must be higher than beam surface) to grout the gap between the lower part of the support and anchor bolt hole. Grouting process should be done from the center of the support to the surrounding area until the gap between the steel form and the support bottom plate is observed to be full of grouting material (the top surface of grouting material can be about 2mm higher than the support bottom plate to avoid bottom exposure). Grouting from four sides at the same time is not allowed.

[0140] The thickness of the grouting layer between each bearing base plate and the pad stone surface is between 20mm and 30mm. Vibration is strictly prohibited during the grouting process. Iron wire or the like can be used for diversion when necessary.

[0141] After each bearing is poured, the machine should be cleaned in time to prepare for the next pouring.

[0142] After pouring is completed, a quality inspection is carried out to ensure the construction quality of the box girder.

[0143] S7. The bridge erecting machine 100 moves longitudinally across the span, that is, the bridge erecting machine 100 continues to move longitudinally forward by the distance of a box beam, and then repeats the beam feeding by the beam transporting machine 200 and subsequent steps to perform continuous construction until the bridge construction is finally completed.

[0144] Furthermore, in order to prevent the box girder and the bridge erecting machine 100 from colliding with the tunnel 300 when the beam transporting and bridge erecting machine 100 passes through the tunnel, an automatic driving system is provided on the beam transporting machine 200 .

[0145] The automatic driving system uses a laser radar installed at the front center of the beam transporter 200 to scan the road surface and obstacles such as guardrails on both sides of the road surface, calculates the relative position of the center line of the road surface and the beam transporter 200, and displays it on the display screen. The driver can control the beam transporter 200 according to the display content to prevent the beam transporter 200 from running off the track.

[0146] Specifically, the autonomous driving system maps the coordinate central meridian, projection surface elevation and curve elements based on the actual situation of the construction site, and uses the first coordinate of the construction site as the starting coordinate to establish the entire driving route in the system. The autonomous driving system integrates lidar and camera sensors, using the high resolution of the camera to classify targets, and the reliability of lidar to detect and measure obstacles, integrating the advantages of both to complete environmental perception technology.

[0147] First, a model is established in advance for the known external dimensions of the beam transporter 200 and the inner diameter of the tunnel 300. During the driving of the vehicle, a laser radar is used to monitor the three-dimensional spatial contour dimensions in the driving direction and the dimensions of the vehicle body in space in real time, and the distance between the edge of the vehicle and the edge of the obstacle is predicted when the vehicle passes. When this distance is lower than the safety boundary, an alarm signal will be sent to the driver.

[0148] After knowing the position information of the vehicle body in three-dimensional space, the PID control algorithm is used to achieve automatic and precise alignment and tunnel passing before preparing to feed the beam.

[0149] A 3D point cloud map of the beam transporter's surroundings was constructed using 3D laser radar, and the point cloud image was classified and identified, which can accurately identify the lane line and calculate the position of the laser radar. The actual driving situation of the beam transporter was simulated, and within the rated travel speed of the beam transporter, the position of the vehicle body boundary from the road boundary can be accurately identified, and the travel direction can be adjusted in time.

[0150] The 3D LiDAR is used to perform all-round, blind-spot scanning of the environment around the vehicle, detect and track the position of obstacles, and can serve as a reliable anti-collision protection mechanism.

[0151] The laser radar (LiDAR) used in the alignment of the beam transporter 200 is an optical remote sensing technology. It is a sensor used to accurately obtain three-dimensional position information. It is like a human eye and can determine the position, size, external appearance and even material of an object. First, it emits a beam of laser to the target object, and then determines the actual distance of the target object based on the time interval between reception and reflection. Then, based on the distance and the angle of laser emission, the position information of the object can be derived through simple geometric changes, as shown in the figure. Since the propagation of laser is less affected by the outside world, the distance that LiDAR can detect can generally reach more than 100m. Compared with the radio waves used by traditional radar, LiDAR uses laser rays. The wavelength of laser rays used by commercial LiDAR is generally between 600nm and 1000nm, which is much lower than the wavelength used by traditional radar. Therefore, LiDAR can achieve higher accuracy in measuring the distance and surface shape of objects, and 101 can generally reach above the centimeter level.

[0152] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0153] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A construction method for erecting a box girder through a tunnel using a bridge erecting machine, characterized in that: The following steps are involved: Before the bridge erecting machine (100) passes through the tunnel, all legs of the bridge erecting machine (100) are retracted and turned over so that the width and height of the bridge erecting machine (100) meet the requirements for passing through the tunnel, and the bridge erecting machine (100) is carried by the beam transporting machine (200) to pass through the tunnel; Adjusting the bridge erecting machine (100) to a beam erecting state after exiting the tunnel (300); Feeding beams using a beam transporter (200); The bridge erecting machine (100) erects the beam; The bridge erecting machine (100) lowers the beam and installs the support on the box beam in place; Adjust the reaction force of the fulcrum; The bridge erecting machine (100) moves longitudinally across the span, and then the beam transporting machine (200) is repeatedly used to feed the beams and the subsequent steps are continuously constructed.

2. The construction method for erecting a box girder through a tunnel using a bridge erecting machine according to claim 1, characterized in that: The middle leg (110) of the bridge erecting machine (100) comprises: A connecting beam (111), wherein two connecting beams (111) are symmetrically arranged on both sides of the arm (120) of the bridge erecting machine (100), one end of the connecting beam (111) is hinged to the arm (120) of the bridge erecting machine (100), and the other end extends in a direction perpendicular to the arm (120) of the bridge erecting machine (100) in a normal working state; A column (112), wherein the column (112) is arranged below the connecting beam (111), one end of the column (112) is hinged to the connecting beam (111), and the other end of the column (112) is bent and extended toward a direction close to the bottom of the bridge erecting machine (100) in a normal working state; A lower cross beam (113) is arranged below the connecting beam (111), and two ends of the lower cross beam (113) are respectively detachably connected to a column (112).

3. The method for erecting a box girder through a tunnel using a bridge erecting machine according to claim 2, characterized in that: The front legs (130) of the bridge erecting machine (100) include: An upper crossbeam (131), wherein the upper crossbeam (131) is fixedly connected to the arm (120) of the bridge erecting machine (100); A telescopic support column (132), wherein the top of the telescopic support column (132) passes through the upper crossbeam (131) and is slidably matched with the upper crossbeam (131) to achieve telescopic movement of the telescopic support column (132) in a height direction; A lower column (133), the top end of the lower column (133) being hinged to the bottom end of the telescopic support column (132); A supporting crossbeam (134) is arranged at the bottom end of the lower column (133) and is fixedly connected to the lower column (133).

4. The construction method for erecting a box girder through a tunnel using a bridge erecting machine according to claim 3, characterized in that: A lifting cylinder (136) is provided at the bottom of the upper cross beam (131), and the end of the lifting cylinder (136) is fixedly connected to the telescopic support column (132) for driving the telescopic support column (132) to slide along the upper cross beam (131).

5. The construction method for erecting a box girder through a tunnel using a bridge erecting machine according to claim 3, characterized in that: A positioning assembly is provided between the telescopic support column (132) and the upper crossbeam (131), and is used to limit the telescopic state of the telescopic support column (132) along the upper crossbeam (131).

6. The construction method for erecting a box girder through a tunnel using a bridge erecting machine according to claim 5, characterized in that: The positioning assembly comprises a pin hole (137) arranged along the length direction of the telescopic support column (132), the upper crossbeam (131) is provided with a positioning hole corresponding to the pin hole (137), and the positioning assembly also comprises a positioning pin (138), and the positioning pin (138) is used to pass through the positioning hole and the pin hole (137) at the same time.

7. The construction method for erecting a box girder through a tunnel using a bridge erecting machine according to claim 2, characterized in that: The tunneling step includes: Before the entrance of the tunnel (300), the front legs (130), the rear legs (140) and the rear auxiliary legs (150) of the bridge erecting machine (100) are supported; The lower cross beam (113) of the middle support leg (110) is removed, and the removed lower cross beam (113) is transported to the front end of the arm (120) of the bridge erecting machine (100) through the front transport trolley (160) of the bridge erecting machine (100); The rear transfer trolley (170) of the bridge erecting machine (100) moves to the front end of the arm (120) of the bridge erecting machine (100); The rear legs (140) are turned upwards; The beam transport machine (200) enters below the bridge erecting machine (100); The carrier (210) on the top of the beam transporting machine (200) is raised to contact the bottom surface of the arm (120) of the bridge erecting machine (100); The rear transfer trolley (170) moves to the rear supporting leg (140), the rear auxiliary supporting leg (150) is folded upward, the telescopic support column (132) of the front supporting leg (130) is retracted upward, and the lower column (133) is folded forward; The distal end of the connecting beam of the middle leg (110) is folded toward the bridge erecting machine (100), and the bottom end of the column (112) of the middle leg (110) is folded upward; Adjust the bracket on the beam transport machine (200) to retract downward as a whole until the top of the bridge erecting machine (100) is lower than the height of the tunnel (300); The beam transport machine (200) carries the bridge erecting machine (100) through the tunnel (300).

8. The method for erecting a box girder through a tunnel using a bridge erecting machine according to claim 7, characterized in that: The steps of adjusting the bridge erecting machine (100) to a bridge erecting state after passing through a tunnel include: The beam transporting machine (200) carries the bridge erecting machine (100) to the abutment (400) at the entrance of the tunnel (300), and the front end of the bridge erecting machine (100) extends out of the exit of the tunnel (300); Turn the front legs (130) of the bridge erecting machine (100) over to position and support them on the abutment (400); Fold down the rear auxiliary support leg (150) to provide support; The rear transfer trolley (170) moves to the front end of the bridge erecting machine (100); Place the lower cross beam (113) of the middle leg (110) on the abutment (400); The beam transport machine (200) exits; The rear legs (140) are flipped downwards and supported in place; The front transfer trolley (160) and the rear transfer trolley (170) run to the tail of the bridge erecting machine (100); The rear auxiliary supporting leg (150) is folded upward; The bridge erecting machine (100) moves forward longitudinally as a whole until the middle leg (110) passes through the tunnel (300) to the position of the lower cross beam (113) on the abutment (400); The bridge erecting machine (100) is lifted upward as a whole by a set distance until the middle legs (110) can be fully extended; Fold the connecting beam (111) and the column (112) of the middle leg (110) into place; Installing the lower cross beam (113) of the middle leg (110); The front legs (130) of the bridge erecting machine (100) are longitudinally moved forward to be supported on a bridge pier (500) near the entrance of the tunnel (300); The front transfer trolley (160) and the rear transfer trolley (170) move forward to the beam taking position, and the rear support leg (140) is turned upward; The bridge erecting machine (100) is in a state of waiting to erect bridges at the exit of the tunnel (300).

9. The method for erecting a box girder through a tunnel using a bridge erecting machine according to claim 8, characterized in that: The steps for erecting the box girder after passing the tunnel include: The beam transporter (200) transports beams; The bridge erecting machine (100) is supported by the front legs (130) and the middle legs (110), and the rear legs (140) are folded upward and attached to the bottom of the machine arm (120), and is in a state of waiting for beam erection, and the beam transporting machine (200) feeds the beam into the bridge erecting machine (100); The front transport trolley (160) of the bridge erecting machine (100) is used to take the beam; The front transfer trolley (160) of the bridge erecting machine (100) and the beam transporting machine (200) synchronously drag the beam into place; The bridge erecting machine (100) rearwardly dispatches a trolley (170) to take the beam, and the beam transporting machine (200) returns to the beam yard; The front transfer trolley (160) and the rear transfer trolley (170) jointly move the beam to the right position; The beams are in place.

10. The method for erecting a box girder through a tunnel using a bridge erecting machine according to any one of claims 1 to 9, characterized in that: The beam transport machine (200) is provided with an automatic driving system for preventing the box beam and the bridge erecting machine (100) from colliding with the tunnel (300) when the beam transport machine (200) and the bridge erecting machine (100) are passing through the tunnel.

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