A box girder observation structure and box girder erection method for facilitating accurate positioning

Abstract

The present invention discloses a box girder observation structure and a box girder erection method which are convenient for accurate positioning, and belong to the field of bridge erection construction. The structure comprises a base, a support and an observation trolley, wherein a trolley passage is arranged in the base, the support is installed on the upper side of the base, the support is provided with an observation opening, the observation trolley is provided with an observation box, and an upward laser emitter and a camera are installed on the observation box. The bottom of the box girder is emitted with a laser through the observation trolley for observation, and the observation result is displayed on a display screen in the cab. There is no need for observers to conduct real-time observation, which saves construction manpower, improves construction efficiency, reduces safety hazards, and solves the problem in the prior art that, during the process of hoisting the box girder, personnel are required to conduct real-time observation to accurately position the box girder, resulting in low construction efficiency and safety hazards.

Description

Technical Field

[0001] The invention relates to the field of box girder erection construction, and in particular to a box girder observation structure and a box girder erection method which are convenient for accurate positioning. Background Art

[0002] During the box girder erection process, several box girders need to be erected on supports in sequence by a crane. In order to ensure the accuracy of the box girder erection position, the prior art requires personnel to conduct real-time position observation to cooperate with the operator in the crane cab, which results in insufficient construction efficiency. In addition, there are safety hazards as the observers are close to the moving box girders.

[0003] For example, the "Method for Erecting Steel Box Girders" disclosed in Chinese patent literature has a publication number of CN202111136900.5, which includes: constructing cast-in-place concrete main beams; setting up steel-concrete combined section brackets below the designed position of the steel-concrete combined section in the direction of the mid-span; installing a storage device below the designed position of the 1# segmental steel box girder for storing the 1# segmental steel box girder; using a floating crane to hoist the steel-concrete combined section onto the steel-concrete combined section bracket, and then using a floating crane to hoist the 1# segmental steel box girder onto the storage device; using a beam erection crane to hoist the 1# segmental steel box girder into place and install it; and erecting the remaining segmental steel box girders until the erection of the steel box girder is completed. A storage device is installed on the ground on the river side. After the floating crane hoists the 1# segmental steel box girder onto the storage device, the floating crane can be withdrawn in advance, reducing the use cost of the floating crane and the construction cost of erecting the 1# segmental steel box girder. It also avoids the problem of long construction period, high cost and high safety risk of setting up super-high underwater support required for erecting 1# segment steel box girder; the disadvantage of this patent is that during the process of lifting the box girder, personnel are required to conduct real-time position observation to cooperate with the operator in the crane cab, which leads to insufficient construction efficiency, and there are safety hazards because the observers are close to the moving box girder. Summary of the invention

[0004] The present invention aims to overcome the problem in the prior art that, during the process of hoisting the box girder, personnel are required to conduct real-time observation to accurately position the box girder, resulting in low construction efficiency and potential safety hazards. A box girder observation structure and a box girder erection method that are convenient for accurate positioning are provided, which do not require observers to conduct real-time observation, thus saving construction manpower, improving construction efficiency and reducing potential safety hazards.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a box girder observation structure that is easy to be precisely positioned, comprising a base, a support and an observation trolley, wherein the base is provided with a trolley channel, the support is installed on the upper side of the base, the support is provided with an observation opening, the base is provided with an observation limit opening concentric with the observation opening, the observation limit opening is communicated with the trolley channel, the observation trolley is provided with an observation box and an observation box mounting groove, a compression spring connected to the observation box is installed in the observation box mounting groove, an upward laser emitter and a camera are installed on the observation box, a reinforcing clamp is installed in the observation opening, the lower end of the reinforcing clamp is interference fit with the observation limit opening, and a display screen for displaying the camera image is installed in the crane cab.

[0007] The observation trolley can continuously move the laser transmitter and the camera to the center position of the support where the box girder needs to be installed by moving in the trolley channel. A light spot can be formed at the bottom of the box girder through the laser transmitter. The camera can be used to observe whether the light spot is located at the installation center of the box girder, thereby judging whether the box girder is accurately in place. Since the display screen is installed in the cab, the driver can control the falling position of the box girder in real time through the display screen without the need for observers; and the compression spring causes the observation box to receive an upward elastic force during the movement of the trolley. When the observation box moves to the observation limit opening, the observation box will bounce upward and get stuck in the observation limit opening. The trolley stops in the observation limit opening, and after the box girder falls completely, the reinforcing clamp will be completely pressed into the observation limit opening, and the observation box will be squeezed downward. After the observation box is squeezed out of the observation limit opening, the observation trolley continues to move forward to the next observation limit opening to facilitate the erection of the next box girder. This structure allows the observation trolley to achieve automatic positioning, and the reinforcing clamp can also support and reinforce the base while being pressed into the observation limit opening to increase the strength of the base. The above structure allows the entire box girder erection process to be completed by only one crane driver without the need for observation personnel, reducing safety hazards and allowing the driver to have higher construction efficiency.

[0008] Preferably, a power supply assembly is installed in the observation box, an upper power connection block is provided on the lower side of the observation box, a lower power connection block is provided in the observation box installation groove, and a driving wheel is installed on the lower side of the observation trolley; the power supply assembly in the observation box can continuously supply power to the camera and the laser transmitter, and the drive of the observation trolley is controlled by the position of the power connection block, that is: when the observation box bounces upward in the observation limit opening, the upper and lower power connection blocks are disengaged, and the driving wheel of the observation trolley stops rotating; when the observation box is pressed down by the reinforced clamp or is limited in the observation channel, the upper and lower power connection blocks are in contact, and the driving wheel continues to rotate to drive the observation trolley forward.

[0009] Preferably, the upper side and both left and right sides of the observation trolley are equipped with limiting wheels; the limiting wheels limit the observation trolley in the trolley channel and generate rolling friction with the side walls of the trolley channel to reduce friction.

[0010] Preferably, an elastic seat is provided in the observation box mounting groove, and the lower electrical block is installed in the elastic seat. The elastic seat generates an extrusion force between the upper electrical block and the lower electrical block when the observation box is pressed down, making the contact more reliable.

[0011] Preferably, a wear-resistant wheel is installed on the upper side of the observation box; the wear-resistant wheel ensures that when the observation trolley moves in the trolley channel, the upper side of the observation box will not have sliding friction with the upper wall of the trolley channel, but rather rolling friction occurs between the wear-resistant wheel and the trolley channel. Since the observation box is subjected to the upward elastic force from the compression spring, the friction between the observation box and the upper wall of the trolley channel is correspondingly larger, and the wear-resistant wheel can increase the service life of the structure here.

[0012] Preferably, the base is cast from concrete, and the support is made of metal.

[0013] A box girder erection method that facilitates precise positioning, characterized in that it comprises the following steps:

[0014] ① Make a cross mark at the position where the bottom of the box girder needs to be aligned with the center of the support;

[0015] ② Place the observation trolley at the starting position of the trolley passage, and install the display screen used to display the images captured by the observation trolley camera in the cab of the crane;

[0016] ③ Start the observation trolley and move it to the center position of the first support;

[0017] ④ Construction workers erect box beams in the cab and precisely position them by aligning the laser emitted by the observation trolley with the cross mark;

[0018] ⑤ After the erection of the box girder at this location is completed, the observation trolley moves to the center position of the next support and proceeds with the erection of the next box girder until all the box girders are erected.

[0019] Therefore, the present invention has the following beneficial effects: (1) The observation trolley emits laser to the bottom of the box girder and observes it. The observation result is displayed on the display screen in the cab. There is no need for observers to conduct real-time observation, which saves construction manpower, improves construction efficiency, and reduces safety hazards; (2) The trolley automatically runs and automatically positions itself at the center of the support. When a box girder is erected, the trolley runs to the support of the next box girder to be installed, and no logic circuit is required for control; (3) The supporting structure of the box girder is reliable; (4) The observation trolley has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic top view of the present invention.

[0021] Figure 2 It is a partially enlarged top view schematic diagram of the present invention.

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure when the observation vehicle of the present invention is located at the observation position.

[0023] Figure 4 yes Figure 3 A partial enlarged view of .

[0024] In the figure: 1, base 2, support 3, observation trolley 4, trolley channel 5, mounting pad 6, observation opening 7, observation limit opening 8, observation box mounting groove 9, compression spring 10, laser emitter 11, reinforcing clamp 12, power supply assembly 13, upper power block 14, lower power block 15, driving wheel 16, limit wheel 17, elastic seat 18, wear-resistant wheel 19, box beam 20, observation box. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figure 1-4In the embodiment shown, a box girder observation structure that is easy to be precisely positioned includes a base 1, a support 2 and an observation trolley 3, wherein a trolley channel 4 is provided in the base, the support is installed on the upper side of the base, and a mounting pad 5 is also provided on the support, a circular observation opening 6 is provided at the center position of the support, an observation limit opening 7 concentric with the observation opening is provided on the base, the diameter of the observation limit opening is slightly smaller than the observation opening, and the observation limit opening is connected to the trolley channel, an observation box 20 and an observation box mounting groove 8 are provided on the observation trolley, the observation box is cylindrical in shape, a compression spring 9 connected to the bottom surface of the observation box is installed in the observation box mounting groove, an upward laser emitter 10 and a camera are installed on the observation box, and a A reinforcing clamp 11, the lower end of which is interference fit with the observation limit opening, and the upper end of which is exposed above the observation opening when the box girder is in the state of being erected, and a display screen for displaying the camera image is installed in the crane cab; a power supply assembly 12 is installed in the observation box, an upper power block 13 is provided on the lower side of the observation box, a lower power block 14 is provided in the observation box mounting groove, and a driving wheel 15 is installed on the lower side of the observation trolley; limit wheels 16 are installed on the upper side and left and right sides of the observation trolley; an elastic seat 17 is provided in the observation box mounting groove, and the lower power block is installed in the elastic seat; a wear-resistant wheel 18 is installed on the upper side of the observation box, the base is cast in concrete, and the support is made of metal.

[0027] A method for erecting a box girder that is convenient for accurate positioning is carried out through the above-mentioned box girder observation structure, comprising the following steps:

[0028] Make cross marks at the positions at both ends of the bottom of the box beam 19 that need to be aligned with the center of the support;

[0029] ② Place the observation trolley at the starting position of the trolley passage, and install the display screen used to display the images captured by the observation trolley camera in the cab of the crane;

[0030] ③ Start the observation trolley and move it to the center of the first support. During the movement of the trolley, the compression spring is in a compressed state, the upper power block and the lower power block are in contact, and the power supply in the observation box supplies energy for the rotation of the trolley. When the observation trolley moves to the center of the first support, the observation box is stuck in the observation limit opening under the action of the compression spring, and stops moving due to the limit of the observation limit opening. At the same time, since the upper power block and the lower power block are separated, the power supply stops supplying energy to the driving wheel, so that the trolley temporarily stops at the first observation position.

[0031] ④ The construction workers erect the box beam in the cab and accurately position it by aligning the laser emitted by the observation trolley with the cross mark; when the light spots formed by the laser at both ends of the bottom of the box beam are exactly in the center of the cross mark, it means that the box beam has been accurately positioned; in the process of the box beam falling, it will first contact the reinforcing clamp ring, and press down the reinforcing clamp ring that is interference fit with the observation limit opening. In the process of pressing down the reinforcing clamp ring, the observation box will be pressed into the observation box installation groove. When the lower side of the box beam completely falls on the support, the reinforcing clamp ring is completely pressed in. At this time, the upper side of the reinforcing clamp ring is flush with the upper side of the installation pad, and the upper side of the observation box is away from the observation limit opening and is located in the trolley channel;

[0032] ⑤ After the erection of the box girder at this location is completed, the observation trolley moves to the center position of the next support and erects the next box girder until all the box girders are erected; since the box girder is erected, the observation box is no longer limited by the observation limit mouth, and the upper and lower power blocks are in contact again, the driving wheel rotates again, and the observation trolley continues to move forward until the observation box is stuck in the next observation limit mouth, and the observation trolley stops again.

Claims

1. A box girder observation structure that facilitates accurate positioning, characterized in that: It includes a base, a support and an observation trolley, the base is provided with a trolley channel, the support is installed on the upper side of the base, the support is provided with an observation opening, the base is provided with an observation limit opening concentric with the observation opening, the observation limit opening is communicated with the trolley channel, the observation trolley is provided with an observation box and an observation box mounting groove, a compression spring connected to the observation box is installed in the observation box mounting groove, an upward laser emitter and a camera are installed on the observation box, a reinforcing clamp ring is installed in the observation opening, the lower end of the reinforcing clamp ring is interference fit with the observation limit opening, a display screen for displaying the camera image is installed in the crane cab, an upper electrical block is provided on the lower side of the observation box, a lower electrical block is provided in the observation box mounting groove, and a driving wheel is installed on the lower side of the observation trolley.

2. The box girder observation structure that facilitates accurate positioning according to claim 1 is characterized in that: A power supply component is installed in the observation box.

3. The box girder observation structure that facilitates accurate positioning according to claim 2 is characterized in that: The upper side and the left and right sides of the observation trolley are all equipped with limited wheels.

4. The box girder observation structure that facilitates accurate positioning according to claim 2 is characterized in that: An elastic seat is arranged in the observation box installation groove, and the lower electrical connection block is installed in the elastic seat.

5. The box girder observation structure that facilitates accurate positioning according to claim 1 is characterized in that: A wear-resistant wheel is installed on the upper side of the observation box.

6. A box girder observation structure that facilitates accurate positioning according to any one of claims 1 to 5, characterized in that: The base is cast in concrete, and the support is made of metal.

7. A method for erecting a box girder that facilitates accurate positioning, characterized in that: The box girder observation structure for facilitating precise positioning as described in any one of claims 1 to 5 comprises the following steps: ① Make a cross mark at the position where the bottom of the box girder needs to be aligned with the center of the support; ② Place the observation trolley at the starting position of the trolley passage, and install the display screen used to display the images captured by the observation trolley camera in the cab of the crane; ③ Start the observation trolley and move it to the center position of the first support; ④ Construction workers erect box beams in the cab and precisely position them by aligning the laser emitted by the observation trolley with the cross mark; ⑤ After the erection of the box girder at this location is completed, the observation trolley moves to the center position of the next support and proceeds with the erection of the next box girder until all the box girders are erected.

Images