Bridge precast box girder transport device

Abstract

The application discloses a bridge prefabricated box girder transport device and relates to the technical field of prefabricated box girder transport vehicles, which comprises a transport placing base used for being fixedly installed on a flat carriage of a transport vehicle, a limiting groove for limiting and placing a prefabricated box girder is formed in the transport placing base; a placing flat plate is arranged above the bottom end face of the limiting groove; the placing flat plate is elastically connected to the bottom end face of the limiting groove through an elastic movable structure; side wall plates are arranged on the two side walls of the limiting groove, and the side wall plates are movably connected to the side walls of the limiting groove through movable structures. The transport device is used for being installed on a flat carriage (a carriage top) of a transport vehicle; the transport device can protect the prefabricated box girder during transportation and hoisting, and the quality of the prefabricated box girder during transportation and construction is ensured.

Description

Technical Field

[0001] This invention relates to the field of precast box girder transport vehicle technology, specifically to a bridge precast box girder transport device. Background Technology

[0002] Precast box girders are key components in modern bridge construction. Precast box girders can be classified according to different standards in bridge engineering as follows:

[0003] 1. Classification by structural form

[0004] Single-box single-cell: Single-box single-cell box girders are suitable for small and medium span bridges. They have a simple structure and are easy to construct.

[0005] Multi-box multi-cell box girders are often used in long-span or wide-deck bridges, with high lateral stiffness and good overall integrity.

[0006] 2. Classified by material

[0007] Prestressed concrete box girder: Enhanced crack resistance and load-bearing capacity through prestressing technology, suitable for highway and railway bridges.

[0008] Steel box girder: Made of steel, it is lightweight and high-strength, and is often used in long-span bridges (such as cable-stayed bridges and suspension bridges).

[0009] 3. Classification by construction method

[0010] Precast box girder: It is prefabricated in the factory and then transported to the site for assembly. It is efficient and suitable for standardized construction.

[0011] Cast-in-place box girder: cast-in-place with formwork on site, suitable for complex terrain or special structural requirements.

[0012] 4. Classification by span

[0013] Small-span box girders (e.g., 20-35 meters): commonly used in urban viaducts or highway bridges, with relatively low beam height (e.g., a 30-meter box girder is 1.6 meters high), and strict clearance requirements.

[0014] Large-span box girders (e.g., over 40 meters): require the use of prestressed technology or steel box girders to meet the requirements of large spans.

[0015] 5. Categorized by application scenario

[0016] Box girders for highway bridges: Emphasis is placed on economy and durability, and prestressed concrete box girders are mostly used.

[0017] Railway bridge box girders: To meet higher load and stability requirements, multi-cell structures are often used.

[0018] Precast box girders are all constructed in precast plants. After passing inspection, they are transported to the bridge construction site for assembly and construction. Existing transport vehicles for precast box girders place them directly on the flatbed of the vehicle. During transport, bumps and jolting can cause the precast box girders to shift on the flatbed, damaging their edges and corners and affecting their quality (including appearance and load-bearing capacity). Summary of the Invention

[0019] The objective of this invention is achieved through the following technical solution:

[0020] A bridge precast box girder transport device includes a transport placement base for mounting and fixing on a flatbed trailer of a transport vehicle, wherein the transport placement base has a limiting groove for limiting the placement of the precast box girder;

[0021] A placement plate is provided above the bottom end face of the limiting groove, and the placement plate is elastically connected to the bottom end face of the limiting groove through an elastic movable structure.

[0022] The two side walls of the limiting groove are respectively provided with side wall plates, and the side wall plates are respectively movably connected to the side walls of the limiting groove through a movable structure.

[0023] Two elastic movable structures are provided, one at each end of the bottom of the plate.

[0024] Each of the elastic movable structures includes an elastic movable guide shaft and an elastic spring;

[0025] One end of the elastic movable guide shaft is used to be fixedly connected to the bottom end of the plate. The bottom end face of the limiting groove is provided with a movable guide blind hole. The other end of the elastic movable guide shaft is used to movably pass through the movable guide blind hole, and the outer wall of the elastic movable guide shaft is in a limiting contact with the inner wall of the movable guide blind hole for lifting and lowering movement.

[0026] An elastic spring is sleeved on the elastic movable guide shaft. One end of the elastic spring is used to connect with the bottom end of the plate, and the other end of the elastic spring is used to connect with the bottom end face of the limiting groove.

[0027] Preferably, all of the movable structures include a movable hydraulic rod;

[0028] One end of the movable hydraulic rod is hinged to the side wall plate via a hinge seat. The side wall of the limiting groove is provided with a hydraulic rod mounting hole. The other end of the movable hydraulic rod is movably inserted into the hydraulic rod mounting hole and is connected to the inner wall of the hydraulic rod mounting hole via a hinge seat.

[0029] Preferably, hinged connecting rods are provided on both sides of the bottom of the sidewall near the limiting groove of the sidewall plate, and the hinged connecting rods are inclined.

[0030] One end of the hinged connecting rod is hinged to the side wall plate via a hinge seat, and the other end of the hinged connecting rod is hinged to the side wall of the limiting groove via a hinge seat.

[0031] Preferably, a damping force variable expansion joint is provided on both sides of the top of the side wall near the limiting groove of the side wall plate, and the damping force variable expansion joint is also inclined.

[0032] One end of the variable damping force expansion joint is hinged to the side wall plate via a hinge seat, and the other end of the variable damping force expansion joint is hinged to the expansion joint movable block via a hinge seat. The expansion joint movable block is used to slide and limit the movement of the side wall of the limiting groove.

[0033] Each of the damping force variable expansion joints is fitted with a telescopic spring. One end of the telescopic spring is used to connect to one end of the damping force variable expansion joint, and the other end of the telescopic spring is used to connect to the other end of the damping force variable expansion joint.

[0034] Preferably, the two side walls of the limiting groove are respectively provided with movable grooves corresponding to the movable block of the telescopic device, and the movable block of the telescopic device is placed in the movable groove and is slidably limited with the movable groove.

[0035] Preferably, movable support structures are provided on both sides of the bottom end of the placement plate;

[0036] Each of the movable support structures includes a movable support rod and a movable support block;

[0037] The movable support rod is inclined, one end of which is hinged to the bottom of the plate being placed via a hinge seat, and the other end of which is hinged to the movable support block via a hinge seat. The movable support block is slidably limited to the bottom of the limiting groove.

[0038] Preferably, the bottom end face of the limiting groove is provided with a supporting movable groove corresponding to the supporting movable block, and the supporting movable block is placed in the supporting movable groove and is slidably limited with the supporting movable groove.

[0039] Preferably, the end of the supporting movable block away from the movable support rod is provided with an elastic protective structure;

[0040] The elastic protection structure includes an elastic guide rod and a protective spring;

[0041] One end of the elastic guide rod is used to connect and fix it to the support movable block, and the other end of the elastic guide rod is movably inserted into the side wall of the support movable groove away from the movable support rod.

[0042] A protective spring is fitted on the elastic guide rod, and the protective spring is connected to the support movable block. The other end of the protective spring is movably connected to the side wall of the support movable groove away from the movable support rod.

[0043] Preferably, a lifting structure is provided on one side of the transport and placement base;

[0044] The lifting structure includes a first lifting arm and a second lifting arm;

[0045] The first lifting arm and the second lifting arm are rotatably and crosswise connected at their middle parts by a pin.

[0046] The bottom end of the first lifting arm is rotatably connected to the lifting fixed seat via a rotating shaft. The lifting fixed seat is fixed to one side of the fixed mounting plate, and one side of the fixed mounting plate is used to be fixedly connected to the transport and placement base.

[0047] The bottom end of the second lifting arm is rotatably connected to the lifting movable seat via a rotating shaft. The lifting movable seat is used for a limited movable connection with the fixed mounting plate.

[0048] Preferably, the top ends of the first lifting arm and the second lifting arm are rotatably connected by a rotating shaft with a movable roller.

[0049] The bottom end of the lifting seat is connected to a movable limiting slider. A limiting groove is provided on the side of the fixed mounting plate near the lifting seat. The movable limiting slider is placed in the limiting groove and is slidably limited with the limiting groove.

[0050] A telescopic hydraulic rod is provided at the end of the lifting movable seat away from the lifting fixed seat;

[0051] One end of the telescopic hydraulic rod is hinged to the lifting seat via a hinged seat, and the other end of the telescopic hydraulic rod movably passes through the reinforcing rib and is connected to the fixed plate.

[0052] One end of the reinforcing rib is used to connect and fix to one end of the transport and placement base, and the bottom end of the reinforcing rib is used to connect and fix to the top end of the fixed mounting plate.

[0053] One end of the fixing plate is used to connect and fix to one end of the transport and placement base, and the bottom end of the fixing plate is used to connect and fix to the top end of the fixing mounting plate.

[0054] The beneficial effects of this invention are: the purpose of this invention is to provide a bridge precast box girder transport device, which is used to be installed on the flatbed (top) of a transport vehicle; through this transport device:

[0055] 1. The transport device is equipped with a placement plate for elastic support and protection, which can play the role of "shock absorption and protection" during the transport of precast box girders by transport vehicles, reduce "collision" to the bottom surface and edges of the precast box girders, and protect the bottom part of the precast box girders.

[0056] 2. The transport device is designed with side wall plates on both sides of the limiting groove opened in the transport and placement base. The side wall plates serve the purpose of "flexible limiting protection" for the side walls of the precast box girder transported by the transport vehicle.

[0057] 3. During transportation, the transportation device can adaptively protect the precast box girder that is limited in its transportation, reducing bumps and damage to the precast box girder during transportation;

[0058] 4. The transport device is also equipped with a "lifting structure". This lifting structure provides "lifting support" for the precast box girder, lifting it up and reducing "collision" with the precast box girder during lifting, thus further ensuring the quality of the precast box girder. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the connection structure of the bridge precast box girder transportation device of the present invention;

[0060] Figure 2 This is an exploded view of the connecting structure of the bridge precast box girder transportation device of the present invention;

[0061] Figure 3 This is a schematic diagram of the connection structure between the placement plate and the side wall plate of the bridge precast box girder transportation device of the present invention;

[0062] Figure 4 This is an exploded schematic diagram of the connection structure between the placement plate and the side wall panel of the bridge precast box girder transportation device of the present invention;

[0063] Figure 5 This is a schematic diagram of the placement plate connection structure of the bridge precast box girder transportation device of the present invention;

[0064] Figure 6 This is an exploded view of the placement plate connection structure of the bridge precast box girder transportation device of the present invention;

[0065] Figure 7 This is a schematic diagram of the side wall panel connection structure of the bridge precast box girder transportation device of the present invention;

[0066] Figure 8This is an exploded view of the side wall panel connection structure of the bridge precast box girder transportation device of the present invention;

[0067] Figure 9 This is a schematic diagram of the connection structure of the flexible movable connection mechanism of the bridge precast box girder transportation device of the present invention;

[0068] Figure 10 This is a schematic diagram of the transport and placement base structure of the bridge precast box girder transport device of the present invention;

[0069] Figure 11 This is a schematic diagram of the lifting structure of the bridge precast box girder transportation device of the present invention;

[0070] In the diagram, 1-transport and placement base, 2-placement plate, 3-side wall plate, 11-movable guide blind hole, 21-elastic movable guide shaft, 22-elastic spring, 23-movable support rod, 24-support movable block, 31-movable hydraulic rod, 32-hinged connecting rod, 33-damping force variable telescopic device, 34-telescopic device movable block, 41-first lifting arm, 42-second lifting arm, 43-telescopic movable hydraulic rod, 44-reinforcing rib plate, 45-movable rotating roller, 51-placement plate hinge block, 52-side wall plate hinge block, 53-movable hinge rod, 55-movable connecting guide rod, 241-elastic guide movable rod, 242-protective spring, 331-telescopic spring, 411-lifting fixed seat, 421-lifting movable seat, 431-fixed plate, 551-first ball head, 553-ball head seat. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0072] Example 1

[0073] like Figures 1 to 11 As shown, a bridge precast box girder transport device is installed on the flatbed (top) of the transport vehicle. This transport device can protect the precast box girder during the transportation process (avoiding damage to the surface and edges of the precast box girder).

[0074] The precast box girders that need to be moved to the construction site are placed on the transport vehicle and connected to the transport device (the limiting groove opened in the transport placement base 1). Since the precast box girders are long and heavy, several flatbed trailers of transport vehicles are required. Therefore, one of these transport devices needs to be installed and connected to each flatbed trailer of the transport vehicle. The following is a detailed description of one of the "transport devices":

[0075] The transport device includes a transport placement base 1 for mounting and fixing on the flatbed of a transport vehicle. The transport placement base 1 has a limiting groove for limiting the placement of the precast box girder. At the same time, a placement plate 2 is provided above the bottom end face of the limiting groove. The placement plate 2 is elastically connected to the bottom end face of the limiting groove through an elastic movable structure. The transport device is used to install on the flatbed (roof) of the box girder transport vehicle. The precast box girder is lifted and placed in the limiting groove of the transport placement base 1 of the transport device. At the same time, the placement plate 2 is elastically provided above the bottom end face of the limiting groove. The precast box girder is placed on the placement plate 2. The elastic placement plate 2 protects the bottom end face, edges (and the whole) of the precast box girder.

[0076] Meanwhile, the two side walls of the limiting groove are respectively provided with side wall plates 3, and the side wall plates 3 are movably connected to the side walls of the limiting groove through a movable structure; by controlling and adjusting the side wall plates 3 on both sides, the side walls (edges) of the precast box girder of the limiting groove are "limited" and "adaptively" elastically protected.

[0077] Example 2

[0078] Based on Example 1, such as Figure 3 , Figure 4 as well as Figure 5 , Figure 6 As shown, the device has two elastic movable structures, one at each end of the bottom of the plate 2. Each elastic movable structure includes an elastic movable guide shaft 21 and an elastic spring 22. One end of the elastic movable guide shaft 21 is fixedly connected to the bottom of the plate 2. The bottom surface of the limiting groove has a movable guide blind hole 11. The other end of the elastic movable guide shaft 21 is movably inserted into the movable guide blind hole 11, and the outer wall of the elastic movable guide shaft 21 is in a limiting contact with the inner wall of the movable guide blind hole 11. At the same time, an elastic spring 22 is sleeved on the elastic movable guide shaft 21. One end of the elastic spring 22 is connected to the bottom of the plate 2, and the other end of the elastic spring 22 is connected to the bottom surface of the limiting groove.

[0079] In this embodiment, the precast box girders (all) are placed on the placement plate 2 on the bottom end of the limiting groove of the transport and placement base 1. Since the bottom ends of the placement plate 2 are respectively provided with "elastic movable structures", the elastic movable guide shaft 21 of the elastic movable structure is used to "support and guide" the placement plate 2. The elastic spring 22 connected to the elastic movable guide shaft 21 and "cooperate" with the elastic movable guide shaft 21 can provide "elastic shock absorption protection" for the placement plate 2, thereby reducing the damage to the surface and edges of the precast box girders caused by "bumps and vibrations" during the transport of the precast box girders by the transport vehicle.

[0080] Furthermore, since the transport device is fixedly installed on the flatbed of each transport vehicle, and the connection points of the flatbeds of each transport vehicle are all "flexible (hinged) connections," when the flatbeds of the transport vehicle "vibrate" due to "bumps and vibrations" during transportation, the placement plate 2 of the transport device adopts an "elastic limiting connection method." The placement plate 2 can "adapt to and attenuate" the "amplitude" caused by "bumps and vibrations" during the transport of the precast box girder, allowing the precast box girder to maintain a certain "levelness," thereby ensuring the "prestress" of the "prestressed tendons" inside the entire precast box girder, and further ensuring the overall quality of the precast box girder transported to the construction site.

[0081] Furthermore, to ensure that the placement plate 2 can provide "elastic protective support" for the precast box girder placed on it, movable support structures are respectively installed on both sides of the bottom end of the placement plate 2. Each movable support structure includes a movable support rod 23 and a movable support block 24. The movable support rod 23 is inclined, with one end hinged to the bottom end of the placement plate 2 via a hinge seat, and the other end hinged to the movable support block 24 via a hinge seat. The movable support block 24 is slidably limited and connected to the bottom end of a limiting groove. Simultaneously, the bottom surface of the limiting groove has a corresponding movable support groove, in which the movable support block 24 is placed and slidably limited. A "movable support structure" is symmetrically set between the bottom surface of the placement plate 2 and the limiting groove. The two movable support structures provide a further "flexible reinforcement connection" between the bottom surface of the placement plate 2 and the limiting groove. This ensures that when the precast box girder is placed on the placement plate 2 in the limiting groove, the placement plate 2 can be "vertically and flexibly moved". This avoids the "tilting and swaying" caused by the "uneven force" on the placement plate 2, which would cause bumps and damage to the surface and edges of the precast box girder, affecting the appearance and quality requirements.

[0082] Furthermore, an elastic protective structure is provided at the end of the supporting movable block 24 away from the movable support rod 23; the elastic protective structure includes an elastic guide movable rod 241 and a protective spring 242; one end of the elastic guide movable rod 241 is used to connect and fix it to the supporting movable block 24, and the other end of the elastic guide movable rod 241 is movably inserted into the side wall of the supporting movable groove away from the movable support rod 23; a protective spring 242 is sleeved on the elastic guide movable rod 241, the protective spring 242 is connected to the supporting movable block 24, and the other end of the protective spring 242 is movably inserted into the side wall of the supporting movable groove away from the movable support rod 23. The movable support block 24 is "limited and slidable" in the movable support groove. When the inclined movable support rod 23 is subjected to the load (gravity of the precast box girder) on the plate 2, it pushes the movable support block 24 to slide in the movable support groove. Through the elastic guide rod 241 of the elastic protection structure and the "elastic guidance" of the protective spring 242, the movable support block 24 can slide "stable and guided" in the movable support groove. When the protective spring 242 is "compressed" to the limit, the elastic guide rod 241 "stops moving", preventing the movable support block 24 from continuing to slide in the movable support groove. In conjunction with the "elastic movable structure", the plate 2 is "flexibly supported" and placed stably, so that the plate 2 and the bottom end of the limiting groove of the transport and placement base 1 are kept at a certain distance. That is, the plate 2 is "flexibly and slidably" placed at a certain distance above the bottom end of the limiting groove of the transport and placement base 1, so as to provide "flexibility, stability and support" for the precast box girder placed on the plate 2. At the same time, it avoids the "swaying" of the plate 2 placed on different sections due to "bumps and vibrations" during transportation by the transport vehicle, which would cause different frequencies of swaying amplitude, thereby causing damage to the surface and edges of the precast box girder, and reducing the "impact" on the prestressing tendons inside the precast box girder, thus ensuring the quality of the precast box girder transported to the construction site.

[0083] It should be noted that the “elastic movable structure”, “movable support structure”, and “elastic protective structure connected to the movable support structure” set between the bottom surface of the limiting groove of the placement plate 2 and the transport placement base 1 should take into account their combined and coordinated effects.

[0084] Example 3

[0085] Furthermore, Figure 3 , Figure 4 as well as Figure 7 , Figure 8As shown, the movable structures on both sides of the limiting groove that are used to "connect" the side wall plate 3 each include a movable hydraulic rod 31; one end of the movable hydraulic rod 31 is hinged to the side wall plate 3 through a hinge seat, the side wall of the limiting groove is provided with a hydraulic rod mounting hole, and the other end of the movable hydraulic rod 31 is movably inserted into the hydraulic rod mounting hole and connected to the inner wall of the hydraulic rod mounting hole through the hinge seat.

[0086] Meanwhile, hinged connecting rods 32 are respectively provided on both sides of the bottom of the side wall near the limiting groove of the side wall plate 3. The hinged connecting rods 32 are inclined. One end of the hinged connecting rod 32 is used to hingely connect with the side wall plate 3 through a hinge seat, and the other end of the hinged connecting rod 32 is used to hingely connect with the side wall of the limiting groove through a hinge seat. On the top two sides of the sidewall of the sidewall near the limiting groove, there are two damping force variable expansion joints 33, which are also inclined. One end of the damping force variable expansion joint 33 is hinged to the sidewall 3 via a hinge seat, and the other end of the damping force variable expansion joint 33 is hinged to the expansion joint movable block 34 via a hinge seat. The expansion joint movable block 34 is used to slide and limit the movement with the sidewall of the limiting groove. A telescopic spring 331 is sleeved on the damping force variable expansion joint 33. One end of the telescopic spring 331 is used to connect to one end of the damping force variable expansion joint 33, and the other end of the telescopic spring 331 is used to connect to the other end of the damping force variable expansion joint 33. In addition, the two sidewalls of the limiting groove are respectively provided with movable grooves corresponding to the expansion joint movable block 34. The expansion joint movable block 34 is placed in the movable groove and is slidably limited with the movable groove.

[0087] In this embodiment, by controlling the "extension and retraction" of the movable hydraulic rod 31 (which can be done using a hydraulic jack), the side wall plate 3, which is hinged to the output end of the movable hydraulic rod 31, is driven to "move relative to each other." That is, by controlling the movement of the movable hydraulic rod 31, the movable hydraulic rod 31 drives the side wall plate 3 to move toward and contact the side wall of the precast box girder. The two side wall plates 3 "flexibly" limit and stabilize the precast box girder in the limiting groove of the transport and placement base 1. It can also adapt to precast box girders with different "width dimensions." Furthermore, when the movable hydraulic rod 31 causes the side wall panel 3 to "abut" against the side wall of the precast box girder, the side wall panel 3 causes the damping force variable expansion joints 33, which are "movably hinged" on both sides of the top of the side wall panel 3, to move; at the same time, the side wall panel 3 causes the hinged connecting rods 32, which are "fixed at one end and hinged at the other end" on both sides of the bottom of the side wall panel 3, to move; this allows the "top and bottom" of the side wall panel 3 to make better (larger area) "flexible contact" with the side wall of the precast box girder, thereby "blocking and limiting" the position of the side wall of the precast box girder and reducing the impact on the side wall, edges, etc. of the precast box girder. Because the side wall panel 3 is connected to the "damping force variable expansion joint 33", when "bumps and vibrations" occur during transportation, the precast box girder placed in the limiting groove of the transportation and placement base 1 "swings". The "flexible" side wall panels 3 on both sides can also "adapt" well to the amplitude of the "swing" of the precast box girder, and can effectively "block and limit" the side wall position of the precast box girder, thus protecting the precast box girder.

[0088] It should be noted that, in order to avoid the two side wall panels 3 making "rigid" contact with the side wall of the precast box girder, "flexible anti-collision strips" were installed on the end face of the two side wall panels 3 near the side wall of the precast box girder.

[0089] To ensure that the transport device can better protect the precast box girder during transportation, the transport device is designed with a flexible (deformable) connecting mechanism for connecting the plate 2 and the side wall panel 3. For example... Figure 3 , Figure 4 as well as Figure 9As shown, the flexible movable connection mechanism includes several plate hinge blocks 51, several side wall plate hinge blocks 52, and a movable hinge rod 53. One end of each plate hinge block 51 is hinged to one side of the plate 2 via a hinge seat, and the other end is rotated and limited by the movable hinge rod 53. The movable hinge rod 53 is arranged parallel to the plate 2 and the side wall plate 3. One end of each side wall plate hinge block 52 is hinged to one side (bottom) of the side wall plate 3 via a hinge seat, and the other end is rotated and limited by the movable hinge rod 53. Furthermore, both sides of the movable hinge rod 53 are flexibly connected to the lower inner wall of the transport placement base 1 (the side wall of the limiting groove in the transport placement base 1) near the side wall plate 3 via movable connectors. The movable connectors of this setup all include movable connecting guide rods 55; the inner side wall of the transport and placement base 1 is provided with a movable guide hole; a first ball head 551 is connected to one end of the movable connecting guide rod 55 near the movable guide hole, the first ball head 551 passes through the movable guide hole, and the diameter of the hole at the end of the movable guide hole near the movable connecting guide rod 55 is smaller than the diameter of the first ball head 551, so that the first ball head 551 can be "movably limited" in the movable guide hole; a second ball head is connected to one end of the movable connecting guide rod 55 near the movable hinge rod 53, the second ball head is flexibly and movably connected to the movable hinge rod 53 through a ball head seat 553 (the second ball head is flexibly and movably connected to the ball head seat 553, and the ball head seat 553 is used for limiting connection with the movable hinge rod 53).

[0090] In this embodiment, the placement plate 2 and the side wall panel 3 are flexibly moved by the flexible (deformable) connecting mechanism. During transportation, when bumps and vibrations occur, the placement plate 2 and the side wall panel 3 can adaptively "move" together with the transported precast box girder under the "flexible and deformable" connection of the flexible connecting mechanism, thereby better protecting the "bottom surface, side walls, and bottom corners" of the precast box girder.

[0091] Example 4

[0092] Furthermore, such as Figure 10 , Figure 11 As shown, a lifting structure is provided on one side of the transport and placement base 1. This lifting structure is used to "lift" the precast box girder transported to the construction site to a certain height on the transport vehicle, so as to avoid damage to the surface and edges of the precast box girder during lifting and moving.

[0093] The lifting structure includes a first lifting arm 41 and a second lifting arm 42. The middle parts of the first lifting arm 41 and the second lifting arm 42 are rotatably and cross-connected by a pin (the first lifting arm 41 and the second lifting arm 42 are configured as a "scissor" structure). The bottom end of the first lifting arm 41 is rotatably connected to the lifting fixed seat 411 by a rotating shaft. The lifting fixed seat 411 is fixed to one side of the fixed mounting plate 4, and one side of the fixed mounting plate 4 is used to fix it to the transport and placement base 1. The bottom end of the second lifting arm 42 is rotatably connected to the lifting movable seat 421 by a rotating shaft. The lifting movable seat 421 is used to limit the movement (sliding) connection with the fixed mounting plate 4.

[0094] Meanwhile, the top ends of the first lifting arm 41 and the second lifting arm 42 are rotatably connected by a rotating shaft to a movable roller 45 (the top ends of the first lifting arm 41 and the second lifting arm 42 are respectively "rotatably" connected to the movable roller 45); the bottom end of the lifting movable seat 421 is connected to a movable limiting slider, and a limiting groove is opened on the side of the fixed mounting plate 4 near the lifting movable seat 421, the movable limiting slider is placed in the limiting groove and is slidably limited with the limiting groove; a telescopic movable hydraulic rod 43 is provided at the end of the lifting movable seat 421 away from the lifting fixed seat 411; One end of the retractable hydraulic rod 43 is hinged to the lifting seat 421 via a hinged seat. The other end of the retractable hydraulic rod 43 passes through the reinforcing rib 44 and is connected to the fixing plate 431. One side of the reinforcing rib 44 is connected and fixed to one side of the transport and placement base 1, and the bottom surface of the reinforcing rib 44 is connected and fixed to the top surface of the fixing plate 4. One side of the fixing plate 431 is connected and fixed to one side of the transport and placement base 1, and the bottom surface of the fixing plate 431 is connected and fixed to the top surface of the fixing plate 4.

[0095] In this embodiment, by controlling the retraction of the movable hydraulic rods 31 on the "two side walls" of the limiting groove of the transport and placement base 1 (or by using hydraulic jacks), the two side wall plates 3 are separated from the two side walls of the precast box girder (by a certain distance); then, the telescopic movable hydraulic rod 43 is controlled to "telescopically move"; that is, by controlling the telescopic movable hydraulic rod 43, the lifting movable seat 421 connected to the output end of the telescopic movable hydraulic rod 43 can be driven to "limit and slide" along the limiting slide groove through the movable limiting slider; thus, the first lifting arm 41 and the second lifting arm 42 can be driven to "rise" relative to the fixed mounting plate 4; thus, the first lifting arm 41 and the second lifting arm 42 can be driven to "rise" relative to the fixed mounting plate 4. The two lifting arms 42 "rise," and the movable rollers 45, which are rotatably connected to the top ends of the first lifting arm 41 and the second lifting arm 42 respectively, lift and support the precast box girder, separating the bottom end of the precast box girder from the placement plate 2 (by a certain distance). This achieves a certain height separation between the bottom end of the precast box girder and the placement plate 2 on the limiting groove of the transport and placement base 1. The two movable rollers 45 are used to achieve lifting and limiting, keeping the precast box girder in a "suspended state." In this way, the possibility of "bumps" to the precast box girder is reduced during hoisting and transportation on the construction site, thereby ensuring the appearance and quality of the precast box girder during transportation. Furthermore, the fixed installation plate 4 is reinforcedly connected to the transport and placement base 1 through the provided reinforcing ribs 44, ensuring the overall stress distribution of the fixed installation plate 4.

Claims

1. A bridge precast box girder transport device, comprising a transport and placement base for mounting and fixing on a flatbed trailer of a transport vehicle, characterized in that, The transport and placement base is provided with a limiting groove for limiting the placement of the precast box girder; A placement plate is provided above the bottom end face of the limiting groove, and the placement plate is elastically connected to the bottom end face of the limiting groove through an elastic movable structure. The two side walls of the limiting groove are respectively provided with side wall plates, and the side wall plates are respectively movably connected to the side walls of the limiting groove through a movable structure. Two elastic movable structures are provided, one at each end of the bottom of the plate. Each of the elastic movable structures includes an elastic movable guide shaft and an elastic spring; One end of the elastic movable guide shaft is used to be fixedly connected to the bottom end of the plate. The bottom end face of the limiting groove is provided with a movable guide blind hole. The other end of the elastic movable guide shaft is used to movably pass through the movable guide blind hole, and the outer wall of the elastic movable guide shaft is in a limiting contact with the inner wall of the movable guide blind hole for lifting and lowering movement. An elastic spring is sleeved on the elastic movable guide shaft. One end of the elastic spring is used to connect with the bottom end of the plate, and the other end of the elastic spring is used to connect with the bottom end face of the limiting groove. All of the movable structures include movable hydraulic rods; One end of the movable hydraulic rod is hinged to the side wall plate via a hinge seat. The side wall of the limiting groove is provided with a hydraulic rod mounting hole. The other end of the movable hydraulic rod is movably inserted into the hydraulic rod mounting hole and is connected to the inner wall of the hydraulic rod mounting hole via a hinge seat. Hinged connecting rods are respectively provided on both sides of the bottom of the side wall near the limiting groove of the side wall plate, and the hinged connecting rods are inclined. One end of the hinged connecting rod is hinged to the side wall plate via a hinge seat, and the other end of the hinged connecting rod is hinged to the side wall of the limiting groove via a hinge seat. The top two sides of the sidewall near the limiting groove of the sidewall are respectively provided with damping force variable expansion joints, and the damping force variable expansion joints are also inclined. One end of the variable damping force expansion joint is hinged to the side wall plate via a hinge seat, and the other end of the variable damping force expansion joint is hinged to the expansion joint movable block via a hinge seat. The expansion joint movable block is used to slide and limit the movement of the side wall of the limiting groove. Each of the damping force variable expansion joints is fitted with a telescopic spring. One end of the telescopic spring is used to connect to one end of the damping force variable expansion joint, and the other end of the telescopic spring is used to connect to the other end of the damping force variable expansion joint.

2. The bridge precast box girder transport device according to claim 1, characterized in that, The two side walls of the limiting groove are respectively provided with movable sliding grooves corresponding to the movable block of the telescopic device. The movable block of the telescopic device is placed in the movable sliding groove and is slidably limited with the movable sliding groove.

3. The bridge precast box girder transport device according to claim 1, characterized in that, Movable support structures are provided on both sides of the bottom end of the plate; Each of the movable support structures includes a movable support rod and a movable support block; The movable support rod is inclined, one end of which is hinged to the bottom of the plate being placed via a hinge seat, and the other end of which is hinged to the movable support block via a hinge seat. The movable support block is slidably limited to the bottom of the limiting groove.

4. The bridge precast box girder transport device according to claim 3, characterized in that, The bottom end face of the limiting groove is provided with a supporting movable groove corresponding to the supporting movable block. The supporting movable block is placed in the supporting movable groove and is slidably limited with the supporting movable groove.

5. The bridge precast box girder transport device according to claim 4, characterized in that, The end of the movable support block away from the movable support rod is provided with an elastic protective structure; The elastic protection structure includes an elastic guide rod and a protective spring; One end of the elastic guide rod is used to connect and fix it to the support movable block, and the other end of the elastic guide rod is movably inserted into the side wall of the support movable groove away from the movable support rod. A protective spring is fitted on the elastic guide rod, and the protective spring is connected to the support movable block. The other end of the protective spring is movably connected to the side wall of the support movable groove away from the movable support rod.

6. The bridge precast box girder transport device according to claim 1, characterized in that, A lifting structure is provided on one side of the transport and placement base; The lifting structure includes a first lifting arm and a second lifting arm; The first lifting arm and the second lifting arm are rotatably and crosswise connected at their middle parts by a pin. The bottom end of the first lifting arm is rotatably connected to the lifting fixed seat via a rotating shaft. The lifting fixed seat is fixed to one side of the fixed mounting plate, and one side of the fixed mounting plate is used to be fixedly connected to the transport and placement base. The bottom end of the second lifting arm is rotatably connected to the lifting movable seat via a rotating shaft. The lifting movable seat is used for a limited movable connection with the fixed mounting plate.

7. The bridge precast box girder transport device according to claim 6, characterized in that, The top ends of the first lifting arm and the second lifting arm are rotatably connected by a rotating shaft with movable rollers. The bottom end of the lifting seat is connected to a movable limiting slider. A limiting groove is provided on the side of the fixed mounting plate near the lifting seat. The movable limiting slider is placed in the limiting groove and is slidably limited with the limiting groove. A telescopic hydraulic rod is provided at the end of the lifting movable seat away from the lifting fixed seat; One end of the telescopic hydraulic rod is hinged to the lifting seat via a hinged seat, and the other end of the telescopic hydraulic rod movably passes through the reinforcing rib and is connected to the fixed plate. One end of the reinforcing rib is used to connect and fix to one end of the transport and placement base, and the bottom end of the reinforcing rib is used to connect and fix to the top end of the fixed mounting plate. One end of the fixing plate is used to connect and fix to one end of the transport and placement base, and the bottom end of the fixing plate is used to connect and fix to the top end of the fixing mounting plate.

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