Box girder erecting method and box girder prefabricating mould for high-speed railway construction

Abstract

The application provides a box girder erection method and a box girder prefabrication mould for high-speed railway construction, and the box girder erection method comprises the following steps: driving two gantry travelling crane frames to move to a preset position along a longitudinal linear track, lifting the gantry travelling crane frames by a jacking assembly on a pier column, so that the track wheels of the two gantry travelling crane frames are separated from the longitudinal linear track; disassembling longitudinal positioning beams on both sides of the pier column, and installing a transverse positioning beam at a corresponding position, the transverse positioning beam being provided with a transverse linear track arranged along a second preset direction; changing the longitudinal arrangement of the track wheels of the gantry travelling crane frames into a transverse arrangement, placing the gantry travelling crane frames on the transverse positioning beam by the jacking assembly, and enabling the track wheels of the gantry travelling crane frames to be in sliding connection with the transverse linear track; and driving the two gantry travelling crane frames to move away from each other along the transverse linear track, so that the box girder is deflected by a preset angle. Compared with the erection mode of a bridge erecting machine, the application has lower cost, is not limited by the width of the beam surface for movement, and is not prone to overturning.

Description

Technical Field

[0001] This invention relates to the field of high-speed railway construction technology, and more specifically, to a method for erecting box girders and a prefabricated mold for box girders used in high-speed railway construction. Background Technology

[0002] With the rapid development of railway construction, higher requirements have been placed on the construction of new high-speed railways. The following problems exist in the process of erecting bridge slabs for curved high-speed railways:

[0003] 1. Using a bridge erecting machine to erect box girders requires a high cost, which will result in significant construction costs.

[0004] 2. When erecting box girders inside the tunnel, the existing bridge erecting machines are too tall due to the height of the tunnel ceiling, making normal construction impossible.

[0005] 3. When erecting box girders on curved railway tracks, existing bridge erecting machines need to make turns on the surface of the box girder. Due to the narrowness of the girder surface, the front and rear wheels of the bridge erecting machine are suspended in the air and lack sufficient traction points, which can easily lead to overturning. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] The technical problem to be solved by the present invention is that existing bridge erecting machines are prone to overturning when erecting box girders on curved high-speed railway paths in tunnels.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] In a first aspect, the present invention provides a method for erecting a box girder, comprising the following steps:

[0011] S1. Longitudinal positioning beams are arranged on both sides of the pier, and the longitudinal positioning beams of adjacent piers are connected by straight track beams to form two longitudinal straight tracks set along the first preset direction.

[0012] S2. Two gantry cranes are set up in front and behind on the longitudinal straight track. The two gantry cranes are used to carry box girders. The box girders are detachably connected to the gantry cranes through connectors. The track wheels of the gantry cranes are slidably connected to the longitudinal straight track.

[0013] S3. Drive the two gantry crane frames to move along the longitudinal straight track to the preset position. The lifting assembly on the pier will lift the gantry crane frames so that the track wheels of the two gantry crane frames are disengaged from the longitudinal straight track.

[0014] S4. Disassemble the longitudinal positioning beams on both sides of the pier column and install the transverse positioning beams at the corresponding positions. The transverse positioning beams have transverse straight tracks set along a second preset direction, which do not coincide with the first preset direction.

[0015] S5. Change the track wheels of the gantry crane from a longitudinal setting to a transverse setting, and place the gantry crane on the transverse positioning beam, so that the track wheels of the gantry crane slide in connection with the transverse straight track.

[0016] S6. Drive the two gantry cranes to move in opposite directions along the transverse straight track so that the box girder deflects at a preset angle;

[0017] S7. Remove the connecting piece and lift the box girder using the lifting assembly on the pier to detach the gantry crane frame from the box girder;

[0018] S8. Place a supporting material between the pier and the box girder, and lower the box girder using the lifting assembly on the pier so that the box girder is placed on the supporting material, thus completing the erection of the box girder.

[0019] Preferably, in step S1, two adjacent piers are a first pier and a second pier. Two longitudinal positioning beams are arranged on both sides of the first pier, such that the centerline of the longitudinal positioning beams coincides with the centerline of the first pier. Two other longitudinal positioning beams are arranged on both sides of the second pier, such that the centerlines of the other two longitudinal positioning beams coincide with the centerline of the second pier.

[0020] Preferably, before laying the longitudinal positioning beam and the straight track beam, multiple steel plates are laid on the ground along the length of the railway, and the longitudinal positioning beam and the straight track beam are placed on the steel plates.

[0021] Preferably, the gantry crane frame includes a crossbeam, columns, and track wheels. The columns are fixedly connected to both ends of the crossbeam, and the track wheels are detachably connected to the bottom of the columns.

[0022] Preferably, the first preset direction is perpendicular to the second preset direction.

[0023] Preferably, the longitudinal positioning beam, the linear track beam, and the transverse positioning beam are provided with rectangular tracks, and the track wheel is provided with a wheel groove that matches the rectangular track.

[0024] Preferably, the method further includes the following steps:

[0025] S9. The lifting assembly on the pier lifts the gantry crane frame so that the track wheels of the two gantry crane frames are disengaged from the transverse straight track. The transverse positioning beams on both sides of the pier are disassembled, and longitudinal positioning beams are installed at the corresponding positions to form a longitudinal straight track.

[0026] Preferably, the method further includes the following steps:

[0027] S10, drive the two longitudinal linear tracks to move to the next span of the bridge.

[0028] Preferably, the method further includes the following steps:

[0029] S11. The lifting assembly lowers the gantry crane frame onto the longitudinal straight track, and drives the two gantry crane frames to move along the longitudinal straight track to the pier position of the next span of the bridge.

[0030] Secondly, the present invention also provides a prefabricated box girder mold for high-speed railway construction, including an outer mold, an inner mold, a first support component, a second support component, and a third support component. The outer mold and the inner mold can be closed to form a mold cavity for forming the box girder. The outer mold includes a bottom mold, a first side mold, and a second side mold. The first side mold and the second side mold are arranged opposite to each other and are respectively hinged to the bottom mold. The first support component is connected to the first side mold and the second side mold. The inner mold includes a first petal mold, a second petal mold, a third petal mold, and a fourth petal mold. The first petal mold is hinged to the second petal mold, and the third petal mold is hinged to the fourth petal mold. The two ends of the second support component are respectively connected to the first petal mold and the second petal mold, and the two ends of the third support component are respectively connected to the third petal mold and the fourth petal mold.

[0031] (III) Beneficial Effects

[0032] The above-described technical solution of the present invention has at least the following advantages:

[0033] In this invention, longitudinal positioning beams of two adjacent piers are connected by straight track beams to form two longitudinal straight tracks set along a first preset direction. This allows two gantry cranes to move along the length of the longitudinal straight tracks, thereby realizing the longitudinal movement and transportation of box girders. The longitudinal positioning beams are set at corresponding positions on both sides of the piers. The longitudinal positioning beams are detachable, allowing for direct installation of transverse positioning beams after disassembly, which is convenient and quick. After the transverse positioning beams are installed at the corresponding positions, they have transverse straight tracks set along a second preset direction. When the gantry cranes are lowered, they can move along the transverse straight tracks, thereby swinging the box girders placed on them at a preset angle to achieve the erection of box girders on curved paths. Compared to the erection method using bridge erecting machines, this invention is not limited by the beam width and is less prone to overturning. Furthermore, it eliminates the need to rent bridge erecting machines, and the components are readily available, significantly reducing construction costs. The height of the gantry cranes only needs to be slightly higher than the height of the piers, resulting in a smaller overall equipment height. This makes it suitable for use in situations where the space between the top of the pier and the top of the tunnel is limited, ensuring smooth construction. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is one of the implementation flowcharts of the box girder erection method provided in the embodiments of the present invention.

[0036] Figure 2 This is the second implementation flowchart of the box girder erection method provided in this embodiment of the invention.

[0037] Figure 3 This is a schematic diagram showing the positions of the first pier, the second pier, and the third pier provided in an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of the structure of the prefabricated box girder mold for high-speed railway construction provided in an embodiment of the present invention.

[0039] The labels for the attached figures are as follows:

[0040] 1. First pier; 2. Second pier; 3. Third pier; 4. Longitudinal positioning beam; 5. Straight track beam; 6. First gantry crane frame; 7. Second gantry crane frame; 8. Lifting assembly; 9. Transverse positioning beam; 61. Track wheel; 91. Transverse straight track; 100. First box girder; 200. Second box girder; 101. First support assembly; 102. Second support assembly; 103. Third support assembly; 104. Bottom formwork; 105. First side formwork; 106. Second side formwork; 107. First petal formwork; 108. Second petal formwork; 109. Third petal formwork; 110. Fourth petal formwork. Detailed Implementation

[0041] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0042] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be located directly on or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component.

[0043] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate that the device or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or the number of technical features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. The specific implementation of this invention will be described in more detail below with reference to specific embodiments:

[0045] like Figure 1 , Figure 2 as well as Figure 3 As shown, this embodiment takes a specific curved high-speed railway path as an example for illustration: the curved high-speed railway path has a first pier 1, a second pier 2 and a third pier 3, wherein the central axes of the first pier 1 and the second pier 2 are located on the same straight line, and the central axis of the third pier 3 deviates from the central axis of the second pier 2 by a preset value, so as to form a curved path when the box girder is laid on it.

[0046] This invention provides a method for erecting box girders, comprising the following steps:

[0047] S1. Longitudinal positioning beams 4 are laid on both sides of the first pier 1, the second pier 2, and the third pier 3. Straight track beams 5 are used to connect the longitudinal positioning beams 4 between the first pier 1 and the second pier 2, and between the second pier 2 and the third pier 3, to form two longitudinal straight tracks set along a first preset direction. In this embodiment, the first preset direction is the direction of the central axis of the first pier 1. Specifically, to avoid relative movement between the two longitudinal straight tracks, multiple crossbars can be used to connect and fix the two longitudinal straight tracks. When it is necessary to move the two longitudinal straight tracks, the crossbars are removed. More specifically, the straight track beam 5 can be composed of multiple segments connected sequentially, or it can be a single integrated structure. The longitudinal positioning beams 4 and the straight track beams 5 are fastened together with bolts.

[0048] S2. Two gantry crane frames are set up in front and behind on the longitudinal straight track, namely the first gantry crane frame 6 and the second gantry crane frame 7. The distance between the first gantry crane frame 6 and the second gantry crane frame 7 is approximately equal to the distance between the first pier 1 and the second pier 2. The two ends of the first box girder 100 are respectively placed on the crossbeams of the first gantry crane 6 and the second gantry crane 7 for transporting the box girder. The first box girder 100 is detachably connected to the gantry crane via a connector. The track wheels 61 of the first gantry crane 6 and the second gantry crane 7 are slidably connected to the longitudinal straight track. Specifically, in this embodiment, the connector includes a first fixing ring pre-embedded in the first box girder 100, a second fixing ring fixedly connected to the first gantry crane 6, a third fixing ring fixedly connected to the second gantry crane 7, and a steel cable. After the steel cable is tensioned, it connects the first fixing ring and the second fixing ring, and connects the third fixing ring and the first fixing ring, so as to bind and fix the first box girder 100 to the first gantry crane 6 and the second gantry crane 7.

[0049] Then, the first gantry crane 6 and the second gantry crane 7 are moved along the longitudinal straight track to a first preset position. At this first preset position, the first gantry crane 6 is located near the first pier 1, and the second gantry crane 7 is located near the second pier 2. Then, the lifting components 8 on the first pier 1 and the second pier 2 contact the first box girder 100. The lifting components work to lift the first box girder 100, so that the first box girder 100 is separated from the first gantry crane 6 and the second gantry crane 7. At this time, the first gantry crane 6 and the second gantry crane 7 can move away from under the first box girder. A supporting material (specifically a rubber pad) is placed between the first pier 1 and the second pier 2 and the first box girder 100, and the first box girder 100 is lowered by the lifting components on the first pier 1 and the second pier 2 so that the first box girder 100 is placed on the supporting material, thus completing the erection of the first box girder 100. The specific method for moving the first gantry crane frame 6 and the second gantry crane frame 7 is as follows: two winches are installed in front of the second gantry crane frame 7, and the ropes of the two winches are respectively fixed to two columns of the second gantry crane frame 7. The second gantry crane frame 7 is moved forward by winding the ropes around the winches. The above steps describe the method of laying box girders on a straight path.

[0050] Next, we will continue to describe the method of laying box girders on curved paths:

[0051] S3. A second box girder 200 is loaded onto the first gantry crane frame 6 and the second gantry crane frame 7. The second box girder 200, the first gantry crane frame 6, and the second gantry crane frame 7 are connected by connectors. The first gantry crane frame 6 and the second gantry crane frame 7 are driven to move along the longitudinal straight track to a second preset position. At the second preset position, the first gantry crane frame 6 is located at the second pier 2, and the second gantry crane frame 7 is located at the third pier 3. The lifting components 8 on the second pier 2 and the third pier 3 respectively lift the first gantry crane frame 6 and the second gantry crane frame 7 (the second box girder 200 is lifted together with the first gantry crane frame 6 and the second gantry crane frame 7) so that the track wheels 61 of the first gantry crane frame 6 and the second gantry crane frame 7 are removed from the longitudinal straight track.

[0052] S4. Disassemble the longitudinal positioning beams 4 on both sides of the second pier 2 and the third pier 3, and install the transverse positioning beams 9 at the corresponding positions. The transverse positioning beams 9 have transverse straight tracks 91 set along the second preset direction, which does not coincide with the first preset direction. The transverse positioning beams 9 and the straight track beams 5 are fastened together by bolts.

[0053] S5. Change the track wheels of the first gantry crane frame 6 and the second gantry crane frame 7 from longitudinal to transverse. The lifting assembly 8 places the first gantry crane frame 6 and the second gantry crane frame 7 on the transverse positioning beam 9, and makes the track wheels of the first gantry crane frame 6 and the second gantry crane frame 7 slide connected to the transverse straight track. Specifically, the track wheels of the first gantry crane frame 6 and the second gantry crane frame 7 are detachable. Fasteners (specifically bolts) detachably connect and fix the track wheels to the gantry crane frame. By removing the fasteners, the track wheels can be removed from the gantry crane frame. Then, rotate the preset connection angle (for example, when the first preset direction is perpendicular to the second preset direction, the preset connection angle is 90°) and then fasten the connection with the fasteners.

[0054] S6. Drive the first gantry crane 6 and the second gantry crane 7 to move in opposite directions along the transverse straight track, so that the second box girder 200 deflects at a preset angle; the driving method can be to set up a winch on one side of the first gantry crane 6 along the length of the transverse straight track, and the winch rope is fixedly connected to the first gantry crane 6, and the first gantry crane 6 is moved by pulling the winch; similarly, set up a winch on the other side of the second gantry crane 7 along the length of the transverse straight track, and the winch rope is fixedly connected to the second gantry crane 7, and the second gantry crane 7 is moved by pulling the winch.

[0055] S7. Remove the connecting parts and lift the second box girder 200 using the lifting components on the second pier 2 and the third pier 3 to separate the first gantry crane frame 6 and the second gantry crane frame 7 from the second box girder 200.

[0056] S8. Place supporting materials between the second pier 2 and the third pier 3 and the second box girder 200, and lower the second box girder 200 using the lifting components on the second pier 2 and the third pier 3 so that the second box girder 200 is placed on the supporting materials, thus completing the erection of the second box girder 200.

[0057] S9. The lifting assembly on the pier lifts the gantry crane frame so that the track wheels of the two gantry crane frames are separated from the transverse straight track. The transverse positioning beams 9 on both sides of the second pier 2 and the third pier 3 are disassembled, and the longitudinal positioning beams 4 are installed in the corresponding positions to form the longitudinal straight track.

[0058] S10. Drive the two longitudinal linear tracks to move to the next span of the bridge. Specifically, this can be done by using a winch to pull the longitudinal linear tracks.

[0059] S11, The lifting assembly lowers the first gantry crane 6 and the second gantry crane 7 onto the longitudinal straight track, and drives the first gantry crane 6 and the second gantry crane 7 to move along the longitudinal straight track to the pier position of the next span of the bridge.

[0060] Repeat steps S3 to S11 until all box girders are erected.

[0061] Preferably, in step S1, the two adjacent piers are a first pier 1 and a second pier 2. Two longitudinal positioning beams are arranged on both sides of the first pier 1, such that the centerline of the longitudinal positioning beams coincides with the centerline of the first pier 1. Two other longitudinal positioning beams are arranged on both sides of the second pier 2, such that the centerlines of the other two longitudinal positioning beams coincide with the centerline of the second pier 2. The transverse linear track 91 is set in the direction of the central axis of the transverse positioning beam 9. Through the above technical solution, the transverse positioning beam 9 can be quickly positioned after the longitudinal positioning beams are disassembled.

[0062] Preferably, before laying the longitudinal positioning beams and straight track beams, multiple steel plates are laid on the ground along the length of the railway, and the longitudinal positioning beams and straight track beams are placed on the steel plates. The steel plates can increase the strength of the ground and prevent ground settlement.

[0063] Preferably, the first gantry crane frame 6 and the second gantry crane frame 7 have the same structure. Taking the first gantry crane frame 6 as an example, the first gantry crane frame 6 includes a crossbeam, a column and a track wheel 61. The two ends of the crossbeam are respectively fixedly connected to the column, and the bottom of the column is detachably connected to the track wheel.

[0064] Preferably, the first preset direction is perpendicular to the second preset direction.

[0065] Preferably, the longitudinal positioning beam, the linear track beam, and the transverse positioning beam are provided with rectangular tracks, and the track wheels are provided with wheel grooves that are adapted to the rectangular tracks.

[0066] Preferably, the method further includes the following steps:

[0067] Secondly, such as Figure 4 As shown, the present invention also provides a prefabricated box girder mold for high-speed railway construction, including an outer mold, an inner mold, a first support component 101, a second support component 102, and a third support component 103. The outer mold and the inner mold can be closed to form a mold cavity for forming the box girder. The outer mold includes a bottom mold 104, a first side mold 105, and a second side mold 106. The first side mold 105 and the second side mold 106 are arranged opposite to each other and are respectively hinged to the bottom mold 104. The first support component 101 is connected to the first side mold 105 and the second side mold 106. The inner mold includes a first petal mold 107, a second petal mold 108, a third petal mold 109, and a fourth petal mold 110. The first petal mold is hinged to the second petal mold, and the third petal mold is hinged to the fourth petal mold. The two ends of the second support component are respectively connected to the first petal mold and the second petal mold, and the two ends of the third support component are respectively connected to the third petal mold and the fourth petal mold.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for erecting box girders, characterized in that, Includes the following steps: S1. Longitudinal positioning beams are arranged on both sides of the pier, and the longitudinal positioning beams of adjacent piers are connected by straight track beams to form two longitudinal straight tracks set along the first preset direction. S2. Two gantry cranes are set up in front and behind on the longitudinal straight track. The two gantry cranes are used to carry box girders. The box girders are detachably connected to the gantry cranes through connectors. The track wheels of the gantry cranes are slidably connected to the longitudinal straight track. S3. Drive the two gantry crane frames to move along the longitudinal straight track to the preset position. The lifting assembly on the pier will lift the gantry crane frames so that the track wheels of the two gantry crane frames are disengaged from the longitudinal straight track. S4. Disassemble the longitudinal positioning beams on both sides of the pier column and install the transverse positioning beams at the corresponding positions. The transverse positioning beams have transverse straight tracks set along a second preset direction, which do not coincide with the first preset direction. S5. Change the track wheels of the gantry crane from a longitudinal setting to a transverse setting, and place the gantry crane on the transverse positioning beam, so that the track wheels of the gantry crane slide in connection with the transverse straight track. S6. Drive the two gantry cranes to move in opposite directions along the transverse straight track so that the box girder deflects at a preset angle; S7. Remove the connecting piece and lift the box girder using the lifting assembly on the pier to detach the gantry crane frame from the box girder; S8. Place a supporting material between the pier and the box girder, and lower the box girder using the lifting assembly on the pier so that the box girder is placed on the supporting material, thus completing the erection of the box girder.

2. The box girder erection method as described in claim 1, characterized in that, In step S1, two adjacent piers are the first pier and the second pier. Two longitudinal positioning beams are arranged on both sides of the first pier, so that the centerline of the longitudinal positioning beams coincides with the centerline of the first pier. Two other longitudinal positioning beams are arranged on both sides of the second pier, so that the centerlines of the other two longitudinal positioning beams coincide with the centerline of the second pier.

3. The box girder erection method as described in claim 1, characterized in that, Before laying the longitudinal positioning beam and the straight track beam, multiple steel plates are laid on the ground along the length of the railway, and the longitudinal positioning beam and the straight track beam are placed on the steel plates.

4. The box girder erection method as described in claim 1, characterized in that, The gantry crane frame includes a crossbeam, columns, and track wheels. The columns are fixedly connected to both ends of the crossbeam, and the track wheels are detachably connected to the bottom of the columns.

5. The box girder erection method as described in claim 1, characterized in that, The first preset direction is perpendicular to the second preset direction.

6. The box girder erection method as described in claim 1, characterized in that, The longitudinal positioning beam, the linear track beam, and the transverse positioning beam are provided with rectangular tracks, and the track wheels are provided with wheel grooves that are adapted to the rectangular tracks.

7. The box girder erection method as described in claim 1, characterized in that, It also includes the following steps: S9. The lifting assembly on the pier lifts the gantry crane frame so that the track wheels of the two gantry crane frames are disengaged from the transverse straight track. The transverse positioning beams on both sides of the pier are disassembled, and longitudinal positioning beams are installed at the corresponding positions to form a longitudinal straight track.

8. The box girder erection method as described in claim 7, characterized in that, It also includes the following steps: S10, drive the two longitudinal linear tracks to move to the next span of the bridge.

9. The box girder erection method as described in claim 8, characterized in that, It also includes the following steps: S11. The lifting assembly lowers the gantry crane frame onto the longitudinal straight track, and drives the two gantry crane frames to move along the longitudinal straight track to the pier position of the next span of the bridge.

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