CN110804953A - Bridge construction site selection method suitable for deep mountains - Google Patents
Bridge construction site selection method suitable for deep mountains Download PDFInfo
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- CN110804953A CN110804953A CN201911123716.XA CN201911123716A CN110804953A CN 110804953 A CN110804953 A CN 110804953A CN 201911123716 A CN201911123716 A CN 201911123716A CN 110804953 A CN110804953 A CN 110804953A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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Abstract
The invention discloses a bridge construction site selection method suitable for a deep mountain, belonging to the field of bridge construction site selection methods, and the method comprises the steps of generating a topographic map of a bridge construction area by a satellite remote sensing image technology, selecting a plurality of groups of preset preselected positions for bridge construction, finely adjusting and correcting the preselected positions by an Internet of things technology, scanning and imaging the preselected positions by using an unmanned aerial vehicle remote sensing imaging technology and further correcting the preselected positions, simultaneously, in the scanning and imaging process of an unmanned aerial vehicle, once a phenomenon of poor signal connection occurs, the unmanned aerial vehicle can put in a plurality of signal transfer devices to increase the working radius of the unmanned aerial vehicle, simultaneously provide signal transfer service for subsequent bridge constructors, and finally, the technical personnel and the constructors examine the preselected positions on site, greatly reduces the difficulty of field investigation and greatly improves the efficiency of bridge site selection.
Description
Technical Field
The invention relates to the field of bridge construction site selection methods, in particular to a bridge construction site selection method suitable for a deep mountain.
Background
The bridge is a building constructed for a road to cross natural or artificial barriers, is erected on rivers, lakes and seas, enables vehicles, pedestrians and the like to smoothly pass through, gradually extends to remote areas along with infrastructure, tunnels are dug in mountainous areas, and the erection of the bridge is gradually becoming sparse and common.
The satellite remote sensing image technology detects the reflection of the earth surface objects to the electromagnetic waves and the electromagnetic waves emitted by the objects in the space through a satellite, thereby extracting the information of the objects and completing the remote identification of the objects. The images obtained by converting and identifying the radio wave information are satellite images, and are commonly used for assisting the early planning stage and the subsequent construction stage of multiple infrastructures, so that the construction cost of the infrastructures is greatly reduced, and the construction efficiency of the infrastructures is improved.
Different from the traditional method for constructing the bridge in a relatively flat area, the difficulty of bridge construction in a mountainous area with complex and variable terrain is high, the difficulty is not closely reflected in the bridge construction process, and the difficulty of site selection of bridge piers and bridge head tower plates of the bridge is far higher than that of the flat area. In the mountainous areas, the risk of field investigation is high, the efficiency is low, even though the field investigation of transmission is difficult to replace by the satellite remote sensing image technology, the image generated by the satellite remote sensing image technology can only be used as a reference at most, is difficult to be used as a decisive material, and the normal construction work of the bridge is easily influenced.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a bridge construction site selection method suitable for a deep mountain, which can generate a topographic map of a bridge construction area through a satellite remote sensing image technology, select multiple groups of preset preselected positions for bridge construction, finely adjust and correct the preselected positions through an internet of things technology, scan and image the preselected positions by using an unmanned aerial vehicle remote sensing imaging technology, further correct the preselected positions, and finally carry out field investigation on the preselected positions by technical personnel and constructors, thereby greatly reducing the difficulty of the field investigation and greatly improving the efficiency of the bridge site selection.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A bridge construction site selection method suitable for a deep mountain mainly comprises the following steps:
s1, satellite scanning imaging, namely scanning the bridge construction area by using a satellite remote sensing image technology to build a three-dimensional map of the bridge construction area, and transmitting the obtained three-dimensional map data to a processing terminal;
s2, correcting the three-dimensional map acquired in the S1 through a local solid map of the bridge construction area stored in the cloud server by the processing terminal to acquire a preselected map;
s3, marking preset points, and selecting a plurality of bridge construction preset points by using a preselected map obtained by the staff through S2;
s4, scanning by an unmanned aerial vehicle, carrying out field scanning imaging on a plurality of preset points of bridge construction by using the unmanned aerial vehicle, and transmitting corresponding data of the scanning imaging to a processing terminal;
s5, scanning data correction, wherein the processing terminal further corrects the preselected map obtained in S2 by using data obtained by scanning of the unmanned aerial vehicle to obtain a field survey map, and deletes, supplements and revises the preset points by using the field survey map;
s6, carrying out on-site survey on the preset point by the staff according to the on-site survey map obtained by the staff in S5, and obtaining detailed information of geological and landform of the preset point;
and S7, selecting a bridge site, wherein the worker uses the S5 to obtain a field survey map, the S6 to obtain geological and geomorphic data of the field survey and bridge construction data of other areas with similar construction conditions stored in the cloud server to budget and estimate the bridge site.
The method can generate a topographic map of a bridge construction area through a satellite remote sensing image technology, select multiple groups of preset preselected positions of bridge construction, finely adjust and correct the preselected positions through the Internet of things technology, then scan and image the preselected positions by using an unmanned aerial vehicle remote sensing imaging technology, further correct the preselected positions, and finally conduct field investigation on the preselected positions by technicians and constructors, so that the difficulty of field investigation is greatly reduced, and the efficiency of bridge site selection is greatly improved.
Furthermore, the processing terminal comprises a control terminal, the signal connection is connected with a scanning satellite, the signal connection of the scanning satellite is connected with a signal transmitting tower, the signal connection of the control terminal is connected with a cloud processing terminal, the scanning satellite can scan the bridge construction area by using a satellite remote sensing image technology to build a three-dimensional map of the bridge construction area, and the signal transmitting tower is a communication transfer device between the bridge construction area and the control terminal.
Furthermore, the device utilized in the scanning of the S4 unmanned aerial vehicle includes a scanning unmanned aerial vehicle group, the scanning unmanned aerial vehicle group is in signal connection with the control terminal, a plurality of signal relay devices are filled in the scanning unmanned aerial vehicle group, the signal relay devices are in signal connection with the portable mobile terminal, the scanning unmanned aerial vehicle group is in signal connection with the signal relay devices, and the scanning unmanned aerial vehicle group can increase the scanning working radius of the scanning unmanned aerial vehicle group by switching 3-4 signal relay devices once the signal connection between the scanning unmanned aerial vehicle group and the control terminal and the signal transmitting tower is poor in the process of executing the scanning work of the S4 unmanned aerial vehicle, and meanwhile, the signal relay devices can also provide the communication transfer work for the future bridge construction work.
Further, signal relay includes repeater main part and four fixed telescopic links, and fixed telescopic link and repeater main part fixed connection, four fixed telescopic link includes telescopic link fixed part and telescopic link movable part, and sliding connection between telescopic link fixed part and the telescopic link movable part, telescopic link fixed part and repeater main part fixed connection, the fixed tail nail of one end fixedly connected with of telescopic link fixed part is kept away from to the telescopic link movable part, and signal relay fixes on vegetation or other physiognomies in bridge construction area through the speed of high altitude whereabouts and fixed tail nail, is that signal relay is difficult for appearing great displacement under the effect of natural external force like strong wind, is difficult for influencing signal relay's relay communication work.
Further, a plurality of barbs of fixedly connected with on the fixed tail nail, the fixed tail nail of a plurality of barbs of fixedly connected with is more difficult to appear great displacement under the effect of nature external force after piercing vegetation or other landforms, is difficult for influencing signal relay's relay communication work.
Furthermore, the outer side of the relay device body is sleeved with a protective outer sleeve, a plurality of radiating holes are formed in the protective outer sleeve, the protective outer sleeve can protect the relay device body, impact on falling of the relay device body is reduced, the radiating holes can enable the relay device body to normally radiate heat, and the relay device body is not prone to being overheated and damaged.
Further, one side that the relay device main part is close to the telescopic link fixed part is equipped with the weight plate, and four telescopic link fixed parts all run through the weight plate and with weight plate fixed connection, the weight plate can make signal relay device's whole focus move down, throw the in-process of signal relay device down at scanning unmanned aerial vehicle crowd, under the effect of weight plate, one section at telescopic link movable part place is changeed downwards, the signal relay device of being convenient for utilizes the position indicating lamp anchoring of fixed connection on the telescopic link movable part at the in-process that drops.
Further, fixedly connected with limiting plate on the telescopic link movable part, and the limiting plate is located the one side that the relay device main part was kept away from to the weight plate, fixedly connected with compression spring between limiting plate and the weight plate, and compression spring cup joints in the outside of telescopic link movable part, and the reciprocating motion through compression spring's compression and extension can reduce the vibrations and the impact that produce when signal relay device collides with vegetation or landform by a wide margin, reduces the probability that relay device main part damaged by a wide margin.
Further, fixedly connected with position indicating lamp in the relay device main part, the position indicating lamp has the effect of indicating the position, makes things convenient for staff to maintain and retrieve signal relay device in the future.
Further, fixedly connected with ultrasonic wave generating device in the repeater main part, ultrasonic wave generating device can send the ultrasonic wave, has the effect of driving the animal, avoids signal repeater to destroy at animals such as the in-process cup bird beasts of normal use.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
this scheme can realize generating the topographic map of bridge construction area through satellite remote sensing image technology, and select the preselection position of the bridge construction that the multiunit was predetermine, through internet of things, finely tune the correction to these preselection positions, then utilize unmanned aerial vehicle remote sensing imaging technology to scan the preselection position and form an image and further revise the preselection position, and simultaneously, at the in-process that unmanned aerial vehicle scanned the imaging work, in case the relatively poor phenomenon of signal connection appears, unmanned aerial vehicle has a chance to drop a plurality of signal transfer devices, increase unmanned aerial vehicle's working radius, also provide signal transfer service for subsequent bridge constructor simultaneously, facilitate for the construction work, investigate on the spot to the preselection position by technical staff and constructor at last again, reduce the degree of difficulty of surveying on the spot and improve the efficiency of bridge site selection by a wide.
Drawings
FIG. 1 is a schematic diagram of the main structure of the present invention;
FIG. 2 is a schematic flow chart of the present invention;
FIG. 3 is a schematic structural diagram of a signal relay apparatus according to the present invention;
FIG. 4 is a schematic view of the structure at A in FIG. 3;
fig. 5 is a side view of a signal relay device of the present invention;
fig. 6 is a schematic structural view of a fixing tail pin of the signal relay device according to the present invention.
The reference numbers in the figures illustrate:
the system comprises a control terminal 1, a scanning satellite 2, a cloud processing terminal 3, a scanning unmanned aerial vehicle cluster 4, a signal transmitting tower 5, a signal relay device 6, a relay device main body 601, a telescopic rod fixing part 602, a telescopic rod moving part 603, a protective outer sleeve 604, a limiting plate 605, a compression spring 606, a counterweight plate 607, a position indicating lamp 608, an ultrasonic wave generating device 609, a portable mobile terminal 7, a fixed tail nail 8 and a barb 9.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
please refer to fig. 2, which mainly includes the following steps:
s1, satellite scanning imaging, namely scanning the bridge construction area by using a satellite remote sensing image technology to build a three-dimensional map of the bridge construction area, and transmitting the obtained three-dimensional map data to a processing terminal;
s2, correcting the three-dimensional map acquired in the S1 through a local solid map of the bridge construction area stored in the cloud server by the processing terminal to acquire a preselected map;
s3, marking preset points, and selecting a plurality of bridge construction preset points by using a preselected map obtained by the staff through S2;
s4, scanning by an unmanned aerial vehicle, carrying out field scanning imaging on a plurality of preset points of bridge construction by using the unmanned aerial vehicle, and transmitting corresponding data of the scanning imaging to a processing terminal;
s5, scanning data correction, wherein the processing terminal further corrects the preselected map obtained in S2 by using data obtained by scanning of the unmanned aerial vehicle to obtain a field survey map, and deletes, supplements and revises the preset points by using the field survey map;
s6, carrying out on-site survey on the preset point by the staff according to the on-site survey map obtained by the staff in S5, and obtaining detailed information of geological and landform of the preset point;
and S7, selecting a bridge site, wherein the worker uses the S5 to obtain a field survey map, the S6 to obtain geological and geomorphic data of the field survey and bridge construction data of other areas with similar construction conditions stored in the cloud server to budget and estimate the bridge site.
The method can generate a topographic map of a bridge construction area through a satellite remote sensing image technology, select multiple groups of preset preselected positions of bridge construction, finely adjust and correct the preselected positions through the Internet of things technology, then scan and image the preselected positions by using an unmanned aerial vehicle remote sensing imaging technology, further correct the preselected positions, and finally conduct field investigation on the preselected positions by technicians and constructors, so that the difficulty of field investigation is greatly reduced, and the efficiency of bridge site selection is greatly improved.
Referring to fig. 1, the processing terminal includes a control terminal 1, the signal connection is made with a scanning satellite 2, the scanning satellite 2 is signal-connected with a signal transmitting tower 5, the control terminal 1 is signal-connected with a cloud processing terminal 3, wherein the scanning satellite 2 can scan a bridge construction area by using a satellite remote sensing image technology to build a three-dimensional map of the bridge construction area, the signal transmitting tower 5 is a communication transfer device between the bridge construction area and the control terminal 1, the device used in S4 unmanned aerial vehicle scanning includes a scanning unmanned aerial vehicle group 4, the scanning unmanned aerial vehicle group 4 is signal-connected with the control terminal 1, the scanning unmanned aerial vehicle group 4 is filled with a plurality of signal relay devices 6, the signal relay devices 6 are signal-connected with a portable mobile terminal 7, the scanning unmanned aerial vehicle group 4 is signal-connected with the signal relay devices 6, the scanning unmanned aerial vehicle group 4 is in the process of performing S4 unmanned aerial vehicle scanning work, once the signal connection between the scanning unmanned aerial vehicle group 4 and the control terminal 1 and the signal transmitting tower 5 is poor, the scanning working radius of the scanning unmanned aerial vehicle group 4 can be increased by throwing 3-4 signal relay devices 6 and using the signal relay devices 6 as communication transfer devices, and meanwhile, the signal relay devices 6 are in signal connection with the portable mobile terminal 7, so that the communication transfer work can be provided for the future bridge construction work.
Referring to fig. 3-6, the signal relay device 6 includes a relay device main body 601 and four fixed telescopic rods, the fixed telescopic rods are fixedly connected to the relay device main body 601, the four fixed telescopic rods include a telescopic rod fixing portion 602 and a telescopic rod moving portion 603, the telescopic rod fixing portion 602 is slidably connected to the telescopic rod moving portion 603, the telescopic rod fixing portion 602 is fixedly connected to the relay device main body 601, one end of the telescopic rod moving portion 603 away from the telescopic rod fixing portion 602 is fixedly connected to a fixed tail nail 8, the signal relay device 6 is fixed to vegetation or other features of a bridge construction area through a high falling speed and the fixed tail nail 8, the signal relay device 6 is not prone to large displacement under the action of natural external force such as strong wind, the relay communication work of the signal relay device 6 is not prone to be affected, and a plurality of barbs 9 are fixedly connected to the fixed tail nail 8, after the fixing tail nail 8 fixedly connected with a plurality of barbs 9 is penetrated into vegetation or other landforms, the fixing tail nail is more difficult to generate larger displacement under the action of the external force in the natural world, the relay communication work of the signal relay device 6 is not easily influenced, the outer side of the relay device main body 601 is sleeved with a protective sleeve 604, a plurality of heat dissipation holes are dug in the protective sleeve 604, the protective sleeve 604 can protect the relay device main body 601 and reduce the impact on the falling of the relay device main body 601, the heat dissipation holes can enable the relay device main body 601 to normally dissipate heat, so that the relay device main body 601 is not easily overheated and damaged, one side of the relay device main body 601 close to the telescopic rod fixing part 602 is provided with a counterweight plate 607, four telescopic rod fixing parts 602 all penetrate through the counterweight plate 607 and are fixedly connected with the counterweight plate 607, the overall gravity center of the signal relay device 6 can be moved downwards by the counterweight plate 607, in the, under the effect of counterweight plate 607, one section at telescopic link movable part 603 place is changeed downwards, be convenient for signal relay 6 utilizes the anchoring of position indicating lamp 608 of fixed connection on telescopic link movable part 603 at the in-process that drops, fixedly connected with limiting plate 605 on the telescopic link movable part 603, and limiting plate 605 is located one side that relay main part 601 was kept away from to counterweight plate 607, fixedly connected with compression spring 606 between limiting plate 605 and the counterweight plate 607, and compression spring 606 cup joints the outside at telescopic link movable part 603, the reciprocating motion through compression and the extension of compression spring 606 can reduce the vibrations and the impact that produce when signal relay 6 collides with vegetation or landform by a wide margin, reduce the probability that relay main part 601 damaged by a wide margin.
Please refer to fig. 3 and 5, a position indicating lamp 608 is fixedly connected to the relay device main body 601, the position indicating lamp 608 has a position indicating function, and facilitates the maintenance and recovery of the signal relay device 6 by the worker in the future, an ultrasonic wave generating device 609 is fixedly connected to the relay device main body 601, the ultrasonic wave generating device 609 can generate ultrasonic waves, and the ultrasonic wave generating device has an effect of driving animals, so as to prevent the signal relay device 6 from being damaged by animals such as cup birds and beasts in the normal use process.
The relay device body 601 is provided with a lithium battery for power supply, and the position indicating lamp 608 and the ultrasonic wave generating device 609 are electrically connected to the lithium battery.
When the bridge site selection work is started, firstly, the scanning satellite 2 is used for scanning the bridge construction area to build a three-dimensional map of the bridge construction area, the obtained three-dimensional map data are transmitted to the control terminal 1, then the control terminal 1 corrects a local ground map stored in the root cloud processing terminal 3 to obtain a preselected map, the influence of vegetation on the three-dimensional map scanned and obtained by the scanning satellite 2 is reduced, then a plurality of bridge construction preset points are selected by a worker through the preselected map, then the control terminal 1 controls the scanning unmanned aerial vehicle cluster 4 to carry out field scanning imaging on the preset points, corresponding data of the scanning imaging are transmitted to the processing terminal, the scanning image obtained by the scanning unmanned aerial vehicle cluster 4 is used for further correcting the preselected map to obtain a field survey map, the preset points are deleted, supplemented and revised through the field map, particularly, in the process of working of scanning the unmanned aerial vehicle group 4, once signals of the control terminal 1 and the signal transmitting tower 5 received by the scanning unmanned aerial vehicle group 4 are weak, the scanning unmanned aerial vehicle group 4 puts down a plurality of signal relay devices 6, the signal relay devices 6 are used for relaying signals for the scanning unmanned aerial vehicle group 4, the scanning radius of the scanning unmanned aerial vehicle group 4 is increased, meanwhile, signal relay services are provided for portable mobile terminals 7 carried by subsequent constructors during entering construction, the construction work is convenient to carry out, and finally, the constructors budget and presume bridge sites by using on-site survey maps, on-site survey geological and bridge construction data of other areas with similar construction conditions stored by a cloud server, and select the most suitable bridge construction position.
Particularly, after the bridge erection work is completed, the signal relay device 6 thrown into the construction area needs to be recovered and processed, so that the influence of the bridge construction on the local environment is reduced.
Claims (10)
1. A bridge construction site selection method suitable for a deep mountain is characterized by comprising the following steps: the method mainly comprises the following steps:
s1, satellite scanning imaging, namely scanning the bridge construction area by using a satellite remote sensing image technology to build a three-dimensional map of the bridge construction area, and transmitting the obtained three-dimensional map data to a processing terminal;
s2, correcting the three-dimensional map acquired in the S1 through a local solid map of the bridge construction area stored in the cloud server by the processing terminal to acquire a preselected map;
s3, marking preset points, and selecting a plurality of bridge construction preset points by using a preselected map obtained by the staff through S2;
s4, scanning by an unmanned aerial vehicle, carrying out field scanning imaging on a plurality of preset points of bridge construction by using the unmanned aerial vehicle, and transmitting corresponding data of the scanning imaging to a processing terminal;
s5, scanning data correction, wherein the processing terminal further corrects the preselected map obtained in S2 by using data obtained by scanning of the unmanned aerial vehicle to obtain a field survey map, and deletes, supplements and revises the preset points by using the field survey map;
s6, carrying out on-site survey on the preset point by the staff according to the on-site survey map obtained by the staff in S5, and obtaining detailed information of geological and landform of the preset point;
and S7, selecting a bridge site, wherein the worker uses the S5 to obtain a field survey map, the S6 to obtain geological and geomorphic data of the field survey and bridge construction data of other areas with similar construction conditions stored in the cloud server to budget and estimate the bridge site.
2. The bridge construction site selection method suitable for the deep mountains as claimed in claim 1, wherein: the processing terminal comprises a control terminal (1), the signal connection is provided with a scanning satellite (2), the signal connection of the scanning satellite (2) is provided with a signal transmitting tower (5), and the signal connection of the control terminal (1) is provided with a cloud processing terminal (3).
3. The bridge construction site selection method suitable for the deep mountains as claimed in claim 1, wherein: the device that S4 unmanned aerial vehicle utilized in scanning includes scanning unmanned aerial vehicle crowd (4), scanning unmanned aerial vehicle crowd (4) and control terminal (1) signal connection, be equipped with a plurality of signal relay device (6) in scanning unmanned aerial vehicle crowd (4), signal relay device (6) signal connection has portable mobile terminal (7), and scans unmanned aerial vehicle crowd (4) and signal relay device (6) signal connection.
4. The bridge construction site selection method suitable for the deep mountains as claimed in claim 3, wherein: signal relay (6) include relay main part (601) and four fixed telescopic links, and fixed telescopic link and relay main part (601) fixed connection, four fixed telescopic link includes telescopic link fixed part (602) and telescopic link movable part (603), and sliding connection between telescopic link fixed part (602) and telescopic link movable part (603), telescopic link fixed part (602) and relay main part (601) fixed connection, telescopic link movable part (603) are kept away from fixed tail nail (8) of one end fixedly connected with of telescopic link fixed part (602).
5. The bridge construction site selection method suitable for the deep mountains as claimed in claim 4, wherein: a plurality of barbs (9) are fixedly connected to the fixed tail nail (8).
6. The bridge construction site selection method suitable for the deep mountains as claimed in claim 3, wherein: a protective outer cover (604) is sleeved outside the relay device body (601), and a plurality of heat dissipation holes are drilled in the protective outer cover (604).
7. The bridge construction site selection method suitable for the deep mountains as claimed in claim 3, wherein: one side of the relay device main body (601) close to the telescopic rod fixing parts (602) is provided with a counterweight plate (607), and the four telescopic rod fixing parts (602) penetrate through the counterweight plate (607) and are fixedly connected with the counterweight plate (607).
8. The bridge construction site selection method suitable for the deep mountains as claimed in claim 3, wherein: the relay device is characterized in that a limiting plate (605) is fixedly connected to the telescopic rod movable portion (603), the limiting plate (605) is located on one side, away from the relay device main body (601), of the counterweight plate (607), a compression spring (606) is fixedly connected between the limiting plate (605) and the counterweight plate (607), and the compression spring (606) is sleeved on the outer side of the telescopic rod movable portion (603).
9. The bridge construction site selection method suitable for the deep mountains as claimed in claim 3, wherein: a position indicating lamp (608) is fixedly connected to the relay device body (601).
10. The bridge construction site selection method suitable for the deep mountains as claimed in claim 3, wherein: an ultrasonic wave generating device (609) is fixedly connected to the relay device body (601).
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Application publication date: 20200218 |