A method for quickly positioning and hoisting a prefabricated box girder in close proximity to high-speed rail double-machine lifting

Abstract

The present application relates to a kind of for high-speed rail double-machine lifting in close proximity to the prefabricated box girder quick positioning hoisting method, respectively arranged traction equipment in the four corner positions of prefabricated box girder, each traction equipment is respectively connected with the corresponding corner position of prefabricated box girder, while hoisting equipment is arranged in the two sides of prefabricated box girder, hoisting equipment connects prefabricated box girder, and the position state of prefabricated box girder can be controlled when hoisting by traction equipment and hoisting equipment;Limiting device is installed between adjacent support cushion stone, and limiting device is used to limit the beam position of prefabricated box girder;Using traction equipment and hoisting equipment to move prefabricated box girder to its design position and carry out beam, and prefabricated box girder is fixed temporarily with support cushion stone, and removes traction equipment and hoisting equipment.The present application has the advantages that: reduce manual labor time, reduce dangerous coefficient, improve positioning accuracy, and can improve construction efficiency, effectively shorten construction period.

Description

Technical Field

[0001] This invention relates to the field of bridge erection technology, and in particular to a method for rapid positioning and hoisting of precast box girders using dual-machine lifting systems adjacent to high-speed railways. Background Technology

[0002] With the development of transportation engineering at home and abroad, precast box girders are widely used in bridge construction due to their many advantages, such as stable and controllable quality, faster construction progress, and reduced construction costs. The erection of precast box girders is a key process. The common positioning method is to use a crane to repeatedly lift and align the girders, which will have a significant impact on the appearance quality of the box girders. This method also involves high manual labor intensity, a high risk factor, low positioning accuracy, low construction efficiency, and a long construction period, which does not meet the strict time requirements of construction adjacent to high-speed railways. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by providing a method for rapid positioning and hoisting of precast box girders for use in close proximity to high-speed railways using dual-machine lifting. By controlling the attitude of the precast box girder during hoisting and limiting its position during lowering, the box girder can be accurately lowered to the designed position, achieving rapid and high-precision construction of the precast box girder erection.

[0004] The objective of this invention is achieved through the following technical solutions: A method for rapid positioning and hoisting of precast box girders for use in close proximity to high-speed railway double-lift hoisting, used to lower the precast box girder onto the support pad, characterized in that the method includes the following steps: Traction devices are arranged at the four corners of the precast box girder, and each traction device is connected to a corresponding corner of the precast box girder. At the same time, hoisting devices are arranged on both sides of the precast box girder, and the hoisting devices are connected to the precast box girder. Both the traction devices and the hoisting devices can control the position of the precast box girder during hoisting. A limiting device is installed between adjacent support pads, the limiting device being used to limit the placement position of the precast box girder; The precast box girder is moved to its designed position and lowered using the traction equipment and the hoisting equipment. The precast box girder is lowered onto the support pad stone under the limiting action of the limiting device. The precast box girder is temporarily fixed to the bearing pad, and the traction equipment and the hoisting equipment are removed.

[0005] GPS signal transmitters are arranged at the center positions of both ends of the top surface of the precast box girder. The position status of the GPS signal transmitters is determined by collecting their position information, and the relative relationship between their current position status and the design position is compared. Based on this, the working parameters of the traction equipment and the hoisting equipment are controlled.

[0006] The limiting device includes a limiting device base and a limiting panel. The limiting device base can be locked onto the adjacent support pads on the cap beam by the locking platform. The limiting panel is hinged to the limiting device base by a limiting panel bracket. The limiting panel bracket can rotate the limiting panel by a certain angle through its connection with the limiting device base. The reaction force support of the limiting panel during rotation is provided by a hydraulic spring.

[0007] The limiting device is a single-sided limiting device, that is, the limiting panel and the limiting panel bracket are provided on one side of the limiting device base, the limiting panel is provided on one side of the limiting panel bracket, and the other side is connected to the other side of the limiting device base through the limiting panel diagonal brace. The hydraulic spring is provided on the limiting panel diagonal brace. The two ends of the limiting panel diagonal brace are respectively hinged to the limiting device base and the limiting panel bracket.

[0008] The limiting device is a double-sided limiting device, that is, the limiting panel and the limiting panel bracket are respectively provided on both sides of the limiting device base, the limiting panel is respectively provided on the opposite outer side of the limiting panel bracket on both sides, and the hydraulic spring is provided between the limiting panel brackets on both sides.

[0009] The limiting panel is made of polytetrafluoroethylene (PTFE).

[0010] The traction device is connected to the expansion joint steel bars or the special traction steel bars pre-embedded at both ends of the precast box girder.

[0011] The advantages of this invention are: it can quickly analyze the relative position of the box girder during its descent using the girder erection command and control system, and issue operation instructions in a timely manner. It can also use an electronic winch to adjust the relative position of the descent in a timely manner, and use a limiting device to quickly and accurately lower the box girder to the design position, thereby improving construction efficiency, greatly shortening the construction time adjacent to the high-speed railway, and thus reducing the impact on the high-speed railway operation. At the same time, it can also reduce the time for manual intervention, effectively reducing labor costs and construction safety risks. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the right side structure of the left-side limiting device in this invention; Figure 2 This is a schematic diagram of the left side structure of the left-side limiting device in this invention; Figure 3 This is a schematic diagram of the right side structure of the right-side limiting device in this invention; Figure 4 This is a schematic diagram of the left side structure of the right-side limiting device in this invention; Figure 5 This is a schematic diagram of the right side structure of the double-sided limiting device in this invention; Figure 6 This is a schematic diagram of the left side structure of the double-sided limiting device in this invention; Figure 7 This is a schematic diagram of the structure of the left and right limiting devices of the present invention when used in combination; Figure 8 This is a schematic diagram of the structure of the left limiting device, the right limiting device, and the double-sided limiting device when used in combination in this invention; Figure 9 This is a schematic diagram of the construction layout structure of the present invention. Detailed Implementation

[0013] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art: like Figure 1-9 As shown in the figure, markings 1-15 represent: 1. Polytetrafluoroethylene limiting panel, 2. Limiting panel bracket, 3. Limiting panel diagonal brace, 4. Hydraulic spring, 5. Limiting device base, 6. Support pad, 7. Cap beam, 8. Left limiting device, 9. Right limiting device, 10. Double-sided limiting device, 11. Precast box girder, 12. Truck crane, 13. Electric winch, 14. GPS signal transmitter, 15. Girder erection command and control system.

[0014] Example: Figures 1 to 9 As shown, the rapid positioning and hoisting method for precast box girders used in this embodiment for lifting adjacent high-speed rail double cranes is used to erect precast box girders 11 on cap beam 7. The cap beam 7 has a support pad 6, which is used to support the precast box girder 11. The limiting device in this embodiment is used to quickly and accurately lower the precast box girder 11 to the position of the support pad 6.

[0015] The method in this embodiment specifically includes the following steps: 1) such as Figure 9As shown, four electric winches 13 are arranged at the four corners of the precast box girder 11 as traction equipment. These four electric winches 13 can cooperate with each other and are mainly used to adjust the horizontal position of the precast box girder 11. The four electric winches 13 are respectively connected to the girder erection command and control system 15 configured in the construction site. The girder erection command and control system 15 can control these four electric winches 13 in a coordinated manner to accurately control the horizontal position of the precast box girder 11. Truck cranes 12 are arranged at a reasonable location away from the high-speed rail side as hoisting equipment to ensure that the normal operation of the high-speed rail is not affected in the event of overturning of the hoisting machinery, breakage of the traction or hoisting wire rope, or other extreme adverse factors. In this embodiment, the two truck cranes 12 arranged on both sides of the precast box girder 11 are mainly used to adjust the height of the precast box girder 11, and also to ensure that the precast box girder 11 is horizontal in the direction of the line connecting the two truck cranes 12. Meanwhile, a GPS signal transmitter 14 is installed at the center of both ends of the top surface of the precast box girder 11. The GPS signal transmitter 14 forms a wireless data connection with a GPS signal receiver configured in the girder erection command and control system 15.

[0016] In this embodiment, each electric winch 13 is connected to the expansion joint steel bars or the special traction steel bars pre-embedded at both ends of the precast box girder 11.

[0017] 2) Arrange cap beams 7 on both sides of the construction site to support the precast box girder 11. Arrange several bearing pads 6 on the cap beams 7 at intervals according to the design requirements. The beam ends of the precast box girder 11 on both sides rest on a corresponding set of bearing pads 6. Install limiting devices between adjacent bearing pads 6.

[0018] Specifically, combined Figure 7 and Figure 8 As shown, in this embodiment, the limiting devices are classified according to their relative positional relationship with the precast cap beam 11 into a left limiting device 8, a right limiting device 9, and a double-sided limiting device, which are single-sided limiting devices. Among them, as... Figure 7 As shown, the left-side limiting device 8 refers to a device arranged on the left side of the precast cap beam 11 that can limit its movement from the left side; similarly, the right-side limiting device 9 refers to a device arranged on the right side of the precast cap beam 11 that can limit its movement from the right side; and for the double-sided limiting device, such as Figure 8 As shown, it is a device arranged between two adjacent precast cap beams 11 so that it can limit the two precast cap beams 11 on both sides from the left and right sides respectively.

[0019] Specifically, combined Figure 1 and Figure 2As shown, the left limiting device 8 in this embodiment includes a limiting device base 5. A locking platform is provided at the lower part of the limiting device base 5, allowing it to be locked between two adjacent support pads 6 on the cap beam 7. This utilizes the existing support pads 6 to restrict the position of the limiting device, thereby limiting the falling position of the precast box girder 11, ensuring it falls precisely to the designed position. A limiting panel bracket 2 is provided on one side of the limiting device base 5, forming a hinge with the limiting device base 5. A polytetrafluoroethylene (PTFE) limiting panel 1, serving as the limiting panel, is provided on the outer side of the limiting panel bracket 2. An upper limiting panel diagonal brace 3 is hinged to the other side of the limiting panel bracket 2. The upper limiting panel diagonal brace 3 is connected to the lower limiting panel diagonal brace 3 via a hydraulic spring 4, and the lower limiting panel diagonal brace 3 forms a hinge with the limiting device base 5.

[0020] Combination Figure 3 and Figure 4 as well as Figure 7 As shown, the right limiting device 9 and the left limiting device 8 in this embodiment have basically the same structure. The two structures are mirror symmetrical. That is, the difference between the two structures is due to the different arrangement positions of the polytetrafluoroethylene limiting panel 1. Therefore, the specific structure of the right limiting device 9 will not be described again.

[0021] Combination Figure 5 and Figure 6 As shown, the double-sided limiting device 10 in this embodiment also includes a limiting device base 5, but two polytetrafluoroethylene panels 1 are respectively provided on both sides of the limiting device base 5. These two polytetrafluoroethylene panels 1 each have a corresponding limiting panel bracket 2. The top ends of the two limiting panel brackets 2 are connected by a hydraulic spring 4, so that the polytetrafluoroethylene panels 1 on both sides can react to each other through the hydraulic spring 4 when subjected to force.

[0022] like Figure 7As shown, taking a precast box girder 11 as an example, before hoisting the precast box girder 11, a left limiting device 8 and a right limiting device 9 are installed on both sides of its designed position. The precast box girder 11 can be lifted above the support pad 6 by two truck cranes and then lowered to the position between the left limiting device 8 and the right limiting device 9. Afterwards, the outer side of the web of the precast box girder 11 can fall onto the support pad 6 under the guidance of the polytetrafluoroethylene (PTFE) limiting panel 1. During this process, the PTFE limiting panel 1 may deflect to the side of the hydraulic spring 4 under the load of the precast box girder 11. At this time, the hydraulic spring 4 provides reaction support and transfers part of the load during the descent of the precast box girder 11, which can effectively reduce the wear of the limiting device. In addition, the limiting device also uses the high lubricity and non-adhesion characteristics of PTFE plate to replace steel plate or pulley, reducing the friction between the limiting device and the precast box girder 11 and effectively protecting the appearance quality of the precast box girder 11. After the beam is lowered, the left limiting device 8 and the right limiting device 9 can be pulled out and moved to the next station for installation.

[0023] like Figure 8 As shown, when multiple precast box girders 11 need to be hoisted, a double-sided limiting device 10 can be installed between adjacent precast box girders 11 to limit the precast box girders 11 on both sides through the polytetrafluoroethylene limiting panels 1 on both sides. The limiting principle is the same as that of a single-sided limiting device. Figure 9 As shown, a limiting device has been installed below the precast box girder 11 being hoisted in the diagram.

[0024] 3) Start the truck crane 12 to suspend the precast box girder 11; simultaneously, activate the girder erection command and control system 15 to collect real-time position information of the precast box girder 11 from GPS signal transmitters 14 at both ends. The electronic information processing and control system compares the current position information of the precast box girder 11 with the design position information to determine the relative relationship between the current position and the design position. The girder erection command and control system 15 issues movement commands to the operators of the electric winch 13 and the truck crane 12 until the precast box girder 11 moves above its corresponding support pad 6. In some cases, when the electric winch 13 and the truck crane 12 are automated, the girder erection command and control system 15 can automatically adjust the automated equipment based on data, which can also improve construction accuracy.

[0025] 4) Weld the temporary reinforcing bars between the precast box girder 11 and the bearing pad 6 to form a temporary fixed connection between the precast box girder 11 and the bearing pad 6. After ensuring stability, remove the connection between the truck crane 12 and the electric winch 13 and the precast box girder 11 to complete the hoisting operation of the precast box girder 11.

[0026] In this process, the hoisting accuracy of the precast box girder 11 in this embodiment is mainly controlled by two aspects. First, the position information of the precast box girder 11 is collected by the GPS signal transmitter 14 to accurately judge and further precisely control its travel during the hoisting process. Second, the accuracy of its placement during the beam is directly controlled by the limiting device. Even if there are small position errors in the precast box girder 11 during the beam lowering process, these errors can be eliminated by the guidance of the limiting device, so that the precast box girder 11 can be accurately placed on the support pad 6.

[0027] In this embodiment, the three limiting devices can be combined into different limiting methods. That is, the left limiting device 8 and the right limiting device 9, which are single-sided limiting devices, can be used in combination at the same time. Alternatively, a single-sided limiting device (left limiting device 8 or right limiting device 9) can be combined with a double-sided limiting device 10. Or, the left limiting device 8, the right limiting device 9, and the double-sided limiting device 10 can be used in combination at the same time.

[0028] The base 5 of the limiting device is prefabricated according to the relative position dimensions of the adjacent support pad 6, while the polytetrafluoroethylene limiting panel 1, the prefabricated panel bracket 2 and the limiting panel diagonal brace 3 are prefabricated according to the dimensions of the prefabricated box girder 11.

[0029] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A method for rapid positioning and hoisting of precast box girders for use in close proximity to high-speed railway double-lifting machines, used to lower the precast box girder onto the support pad, characterized in that: The method includes the following steps: Traction devices are arranged at the four corners of the precast box girder, and each traction device is connected to a corresponding corner of the precast box girder. At the same time, hoisting devices are arranged on both sides of the precast box girder, and the hoisting devices are connected to the precast box girder. Both the traction devices and the hoisting devices can control the position of the precast box girder during hoisting. A limiting device is installed between adjacent support pads, the limiting device being used to limit the placement position of the precast box girder; The precast box girder is moved to its designed position and lowered using the traction equipment and the hoisting equipment. The precast box girder is lowered onto the support pad stone under the limiting action of the limiting device. The precast box girder is temporarily fixed to the bearing pad, and the traction equipment and the hoisting equipment are removed. The limiting device includes a limiting device base and a limiting panel. The limiting device base can be fixed in position between adjacent support pads on the cap beam by a locking plate. The limiting panel is hinged to the limiting device base by a limiting panel bracket. The limiting panel bracket can rotate the limiting panel by a certain angle through its connection with the limiting device base. The reaction force support of the limiting panel during rotation is provided by a hydraulic spring. The limiting device is a double-sided limiting device, that is, the limiting panel and the limiting panel bracket are respectively provided on both sides of the limiting device base, the limiting panel is respectively provided on the opposite outer side of the limiting panel bracket on both sides, and the hydraulic spring is provided between the limiting panel brackets on both sides.

2. The method for rapid positioning and hoisting of precast box girders for dual-machine lifting adjacent to high-speed railways, as described in claim 1, is characterized in that: GPS signal transmitters are arranged at the center positions of both ends of the top surface of the precast box girder. The position status of the GPS signal transmitters is determined by collecting their position information, and the relative relationship between their current position status and the design position is compared. Based on this, the working parameters of the traction equipment and the hoisting equipment are controlled.

3. The method for rapid positioning and hoisting of precast box girders for dual-machine lifting adjacent to high-speed railways, as described in claim 1, is characterized in that: The limiting panel is made of polytetrafluoroethylene (PTFE).

4. The method for rapid positioning and hoisting of precast box girders for dual-machine lifting adjacent to high-speed railways, as described in claim 1, is characterized in that: The traction device is connected to the expansion joint steel bars or the special traction steel bars pre-embedded at both ends of the precast box girder.

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