CN115356063A

CN115356063A - Highway bridge bearing capacity detection device

Info

Publication number: CN115356063A
Application number: CN202210995979.5A
Authority: CN
Inventors: 王春波; 孔维康; 郭彬; 丁稀海
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2022-11-18

Abstract

The invention discloses a highway bridge bearing capacity detection device, which comprises a bottom plate detachably connected with a transport vehicle, wherein two sides of the top surface of the bottom plate are respectively and fixedly connected with a supporting plate, the two supporting plates are symmetrically arranged, a lifting plate is arranged between the two supporting plates, two ends of the lifting plate are respectively and correspondingly and slidably connected with the supporting plates, a secondary lifting part for controlling the lifting plate to move up and down is arranged in each supporting plate, two sliding plates are symmetrically arranged at two ends of the side surface of the lifting plate, the sliding plates are slidably connected with the lifting plate, each sliding plate is fixedly connected with a telescopic arm, an adjusting part for controlling the distance between the two telescopic arms is arranged on the side wall of the lifting plate, a control part and a limiting part for controlling the telescopic arms to stretch are arranged in each telescopic arm, and a measurement sensing assembly is arranged at one end, away from the sliding plates, of each telescopic arm; the telescopic arm height adjusting device is reasonable in structure and convenient to use, can ensure the adjusting precision on the premise of ensuring the height adjusting speed, can limit and protect the telescopic length of the telescopic arm, and has high stability.

Description

Highway bridge bearing capacity detection device

Technical Field

The invention relates to the technical field of bridge detection, in particular to a device for detecting the bearing capacity of a highway bridge.

Background

The bridge detection device is used for observing the stress part of the bridge, the deformation degree of the bridge deck and the flatness of the joint of the bridge deck; the traditional bridge detection is manual detection, the bridge structure is observed at the bottom of the bridge by a detection person to evaluate the state of the bridge, the detection method is characterized in that the detection person is far away from the bridge, so that the detection person is difficult to comprehensively observe the details of the bridge structure, the detection accuracy is reduced, and the danger coefficient of the detection person is increased, the detection device is generally adopted for detection in the prior art, but the detection device in the prior art is generally arranged on an automobile, and a support arm similar to a crane is utilized to move an induction device to the position near the bridge, but the vertical height in the prior art is rapidly adjusted but the accuracy is poor, and the induction device cannot be moved to the optimum observation height, another kind of precision is high but altitude mixture control is slow from top to bottom, make whole regulation time overlength, and press close to the bridge as far as possible in order to make induction system among the prior art, generally be extending structure with the support arm design, but the flexible support arm among the prior art lacks limit structure, after stopping the drive, the length of flexible arm can change, and then influence the distance between induction system and the bridge, and because flexible arm only has one end fixed, the other end is unsettled, the event is very important to the protection limit structure of flexible arm, so it is higher to need a altitude mixture control rapidly and the precision urgently, can carry out timely spacing public road bridge roof beam bearing capacity detection device to flexible length of flexible arm.

Disclosure of Invention

The invention aims to provide a device for detecting the bearing capacity of a highway bridge, which is used for solving the problems in the prior art.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a highway bridge bearing capacity detection device which comprises a bottom plate detachably connected with a transport vehicle, wherein two sides of the top surface of the bottom plate are respectively and fixedly connected with supporting plates, the two supporting plates are symmetrically arranged, a lifting plate is arranged between the two supporting plates, two ends of the lifting plate are respectively and correspondingly and slidably connected with the supporting plates, a secondary lifting part for controlling the lifting plate to move up and down is arranged in each supporting plate, two sliding plates are symmetrically arranged at two ends of the side surface of the lifting plate, the sliding plates are slidably connected with the lifting plate, each sliding plate is fixedly connected with a telescopic arm, an adjusting part for controlling the distance between the two telescopic arms is arranged on the side wall of the lifting plate, a control part and a limiting part for controlling the telescopic arms to stretch are arranged in each telescopic arm, and a measurement sensing assembly is arranged at one end, far away from each sliding plate, of each telescopic arm.

Preferably, second grade lift portion is including seting up in sliding chamber in the backup pad, sliding chamber intracavity sliding connection has the lift seat, sliding chamber top fixed mounting has flexible electric jar, flexible electric jar flexible end with lift seat top fixed connection, lift seat bottom rotates and is connected with the rotary drum, the one end of rotary drum bottom fixedly connected with telescopic link, the telescopic link other end runs through sliding chamber diapire and with sliding chamber diapire rotates to be connected, install two in the bottom plate the synchronous pivoted rotation portion of telescopic link, sliding chamber is close to the holding tank has been seted up to one side of lifter plate, the equal fixedly connected with connecting plate in lifter plate both sides, the connecting plate with holding tank sliding connection, the rotary drum runs through the connecting plate and with connecting plate threaded connection.

Preferably, the adjusting portion includes a rotating sheet located in the middle of the side wall of the lifting plate, the rotating sheet is rotatably connected with the side wall of the lifting plate, two ends of the rotating sheet are fixedly connected with a connecting column, an adjusting rod is rotatably connected to the connecting column, a push rod is fixedly connected to one side of the sliding plate, which is close to the rotating sheet, the push rod is rotatably connected with the adjusting rod, a limiting sleeve is fixedly mounted on the side wall of the lifting plate, which corresponds to the push rod, the push rod penetrates through the limiting sleeve and is slidably connected with the limiting sleeve, an adjusting motor is fixedly mounted in the lifting plate, and an output shaft of the adjusting motor is fixedly connected with the rotating sheet.

Preferably, the telescopic arm comprises a support arm fixedly connected with the sliding plate, a sliding groove is formed in one side of the support arm, the sliding arm is connected in the sliding groove in a sliding mode, the measurement sensing assembly is located at the end portion of the sliding arm, and the control portion and the limiting portion are located on the support arm.

Preferably, the control portion includes a control groove formed in the support arm, the control groove is communicated with the sliding groove, a control gear is rotationally connected in the control groove, a groove is formed in one side, close to the control gear, of the sliding arm, a rack is fixedly connected in the groove and meshed with the control gear, a control motor is fixedly mounted in the support arm, and an output shaft of the control motor is fixedly connected with the control gear.

Preferably, spacing portion including set up in first sliding tray and second sliding tray in the support arm, first sliding tray and second sliding tray all with the control tank communicates mutually, sliding connection has the stopper in the first sliding tray, the stopper with fixedly connected with tension spring between the first sliding tray diapire, the stopper is close to one side of sliding arm be provided with the joint of rack looks adaptation is protruding, the stopper is close to one side of control gear seted up with the tooth's socket that the control gear meshed mutually, stopper top fixedly connected with baffle, sliding connection has the promotion piece in the second sliding tray, promote the piece with second sliding tray looks adaptation, promote the piece with the baffle contact sets up, support arm outside fixed mounting has the air pump, the air pump with the second sliding tray is kept away from the one end of baffle is linked together.

Preferably, the rotation portion is including offering in the chamber that holds of bottom plate, the telescopic link bottom is located hold the intracavity and with hold intracavity wall and rotate and connect, it is connected with the axis of rotation to hold the rotation of chamber middle part, two first sprockets of fixedly connected with in the axis of rotation, two the telescopic link is located hold one end week side and the difference in chamber first sprocket corresponds the fixedly connected with second sprocket, first sprocket with correspond the second sprocket passes through chain drive, axis of rotation middle part fixedly connected with driven gear, hold chamber bottom fixedly connected with motor, rotate motor output shaft fixedly connected with driving gear, the driving gear with driven gear meshes mutually.

Preferably, the telescopic rod comprises a plurality of sliding sleeves which are connected in a sliding mode along the axial direction, the sizes of the sliding sleeves in the same telescopic rod are gradually reduced, the sliding sleeve with the smallest size is fixedly connected with the rotary drum, and the sliding sleeve with the largest size is fixedly connected with the second chain wheel.

The invention discloses the following technical effects: according to the invention, the accurate height of the lifting plate can be adjusted after the height of the lifting plate is rapidly adjusted through the secondary lifting part, the accuracy is improved, so that the measurement sensing assembly is more fit with the optimal detection height, meanwhile, the control part and the limiting part are arranged in the telescopic arm, the telescopic length of the telescopic arm is controlled and limited, the length of the telescopic arm is ensured, meanwhile, the telescopic arm is limited and protected, accidents are prevented, the distance between two measurement sensing assemblies can be adjusted through the adjusting part, two ends of bridges with different sizes can be simultaneously detected, the detection accuracy is high, the structure is reasonable, the use is convenient, the adjustment accuracy can be ensured on the premise of ensuring the height adjustment speed, the telescopic length of the telescopic arm can be limited and protected, and the stability is higher.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a detecting device according to the present invention;

FIG. 2 is a schematic view of a telescopic arm according to the present invention;

wherein: 1. a base plate; 2. a support plate; 3. a lifting plate; 4. a sliding plate; 5. a telescopic arm; 6. a measurement sensing assembly; 7. a sliding cavity; 8. a lifting seat; 9. a telescopic electric cylinder; 10. a drum; 11. a telescopic rod; 12. accommodating grooves; 13. a connecting plate; 14. a rotating sheet; 15. adjusting a rod; 16. a push rod; 17. a position limiting sleeve; 18. a support arm; 19. a chute; 20. a slide arm; 21. a control slot; 22. a control gear; 23. a groove; 24. a first sliding groove; 25. a second sliding groove; 26. a limiting block; 27. a tension spring; 28. a baffle plate; 29. a pushing block; 30. an air pump; 31. an accommodating chamber; 32. a rotating shaft; 33. a first sprocket; 34. a second sprocket; 35. a driven gear; 36. rotating the motor; 37. a drive gear.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.

Referring to fig. 1-2, the invention provides a device for detecting the bearing capacity of a highway bridge, which comprises a bottom plate 1 detachably connected with a transport vehicle, wherein two sides of the top surface of the bottom plate 1 are respectively and fixedly connected with supporting plates 2, the two supporting plates 2 are symmetrically arranged, a lifting plate 3 is arranged between the two supporting plates 2, two ends of the lifting plate 3 are respectively in sliding connection with the supporting plates 2 correspondingly, a second-stage lifting part for controlling the lifting plate 3 to move up and down is arranged in the supporting plates 2, two sliding plates 4 are symmetrically arranged at two ends of the side surface of the lifting plate 3, the sliding plates 4 are in sliding connection with the lifting plate 3, a telescopic arm 5 is fixedly connected to each sliding plate 4, an adjusting part for controlling the distance between the two telescopic arms 5 is arranged on the side wall of the lifting plate 3, a control part and a limiting part for controlling the telescopic arms 5 to stretch are arranged in the telescopic arms 5, and a measuring induction component 6 is arranged at one end of the telescopic arms 5, which is far away from the sliding plates 4. Second grade lift portion can adjust the accurate height of lifter plate 3 after 3 high of quick adjustment lifter plates, improve its precision and make and measure response subassembly 6 best detection height of laminating more, set up control part and spacing portion simultaneously in flexible arm 5, control and spacing flexible length to flexible arm 5, guarantee the length of flexible arm 5, carry out spacing and protection to flexible arm 5 simultaneously, prevent unexpected the emergence, the regulating part can adjust two distances of measuring between the response subassembly 6, can detect the both ends of not unidimensional bridge simultaneously, it is high to detect the precision.

Further optimization scheme, second grade lift portion is including offering the sliding chamber 7 in backup pad 2, sliding connection has lift seat 8 in

sliding chamber

7, 7 top fixed mounting in sliding chamber have flexible electric jar 9, flexible end of flexible

electric jar

9 and 8 top fixed connection of lift seat, 8 bottom rotations of lift seat are connected with rotary drum 10, the one end of rotary drum 10 bottom fixedly connected with telescopic link 11, the telescopic link 11 other end runs through 7 diapalls in sliding chamber and rotates with 7 diapalls in sliding chamber to be connected, install two synchronous pivoted rotation portions of telescopic link 11 of control in the bottom plate 1, sliding chamber 7 has been close to one side of lifter plate 3 and has been seted up holding tank 12, the equal fixedly connected with connecting plate 13 in 3 both sides of lifter plate, connecting plate 13 and 12 sliding connection of holding tank, rotary drum 10 runs through connecting plate 13 and 13 threaded connection with connecting plate. Thereby drive 8 up-and-down motion fast adjustment lifter plate's height through flexible electric jar 9, then drive the rotary drum 10 through the rotation portion and rotate, and then make lifter plate 3 carry out the adjustment of high accuracy, make lifter plate 3 stabilize at best detection height to it stabilizes at best detection height to make and measure the response subassembly.

Further optimize the scheme, the regulation portion is including the rotor plate 14 that is located 3 lateral walls middle parts of lifter plate, rotor plate 14 rotates with 3 lateral walls of lifter plate to be connected, 14 both ends fixedly connected with spliced poles of rotor plate, rotate on the spliced pole and be connected with regulation pole 15, sliding plate 4 is close to one side fixedly connected with push rod 16 of rotor plate 14, push rod 16 rotates with regulation pole 15 to be connected, correspond fixed mounting with push rod 16 on 3 lateral walls of lifter plate and have stop collar 17, push rod 16 run through stop collar 17 and with stop collar 17 sliding connection, fixed mounting has adjusting motor in the lifter plate 3, adjusting motor output shaft and rotor plate 14 fixed connection. The rotating sheet 14 is driven to rotate through the adjusting motor, and then the push rod 16 is pushed or pulled through the two adjusting rods 15, so that the sliding plates 4 slide in the opposite direction or in the opposite direction, the distance between the two telescopic arms 5 is adjusted, and the distance between the two measuring induction assemblies is adjusted.

Furthermore, a plurality of sliding protrusions are fixedly connected to the side wall of the lifting plate 3, a matching groove matched with the sliding protrusions is formed in the bottom of the sliding plate 4, and the sliding plate 4 is connected with the sliding protrusions in a sliding mode through the matching groove to enable the sliding plate 4 to slide on the lifting plate 3 in the opposite direction or in the opposite direction.

Further optimize the scheme, telescopic boom 5 includes the support arm 18 with sliding plate 4 fixed connection, and support arm 18 one side has seted up spout 19, and sliding connection has slide arm 20 in spout 19, measures response subassembly 6 and is located the tip of slide arm 20, and control part and spacing portion all are located support arm 18.

Further optimize the scheme, the control portion is including offering in the control groove 21 of support arm 18, and control groove 21 is linked together with spout 19, and the internal rotation of control groove 21 is connected with control gear 22, and recess 23 has been seted up to one side that slide arm 20 is close to control gear 22, fixedly connected with in the recess 23 and the rack of control gear 22 engaged with, and fixed mounting has control motor in the support arm 18, control motor output shaft and control gear 22 fixed connection. The control motor drives the control gear 22 to rotate, and the control gear 22 is meshed with the rack to drive the sliding arm 20 to move, so that the length of the telescopic arm 5 is controlled.

Further optimize the scheme, spacing portion is including offering first sliding tray 24 and the second sliding tray 25 in the support arm 18, first sliding tray 24 and second sliding tray 25 all are linked together with control slot 21, sliding connection has stopper 26 in first sliding tray 24, fixedly connected with tension spring 27 between stopper 26 and the 24 diapire of first sliding tray, one side that stopper 26 is close to slide arm 20 is provided with the joint arch with rack looks adaptation, stopper 26 is close to one side of control gear 22 and has seted up the tooth's socket with control gear 22 engaged with, stopper 26 top fixedly connected with baffle 28, sliding connection has promotion piece 29 in the second sliding tray 25, promotion piece 29 and second sliding tray 25 looks adaptation, promotion piece 29 and baffle 28 contact setting, support arm 18 outside fixed mounting has air pump 30, air pump 30 is linked together with the one end that baffle 28 was kept away from to second sliding tray 25. When the limit is needed, air is blown into the second sliding groove 25 through the air pump 30, the pushing block 29 is further pushed to move, the pushing block 29 pushes the limiting block 26 to move through the baffle 28, the limiting block 26 moves towards the sliding arm 20 under the action of the control gear 22 and the pushing block 29 and is in contact with the rack to form the limit, when the limit is needed to be cancelled, the air pump 30 is started to evacuate the second sliding groove 25, then the control gear 22 is used for driving the extension part of the telescopic rod 11, the limiting block 26 moves into the first sliding groove 24 under the action of the control gear 22 and the tension spring 27 and is not in contact with the rack, and then the length of the telescopic rod 11 is adjusted through the control gear 22.

Further optimize the scheme, the portion of rotating is including offering the chamber 31 that holds in

bottom plate

1, 11 bottom of telescopic link are located and hold chamber 31 in and with hold chamber 31 inner wall rotation and be connected, hold chamber 31 middle part rotation and be connected with axis of rotation 32, two first sprockets 33 of fixedly connected with on the axis of rotation 32, two telescopic link 11 are located and hold the one end week side of chamber 31 and correspond fixedly connected with second sprocket 34 with different first sprockets 33, first sprocket 33 passes through chain drive with the second sprocket 34 that corresponds, axis of rotation 32 middle part fixedly connected with driven gear 35, hold chamber 31 bottom fixedly connected with and rotate motor 36, rotate motor 36 output shaft fixedly connected with driving gear 37, driving gear 37 meshes with driven gear 35 mutually. The driving gear 37 is driven to rotate by the rotating motor 36, and then the rotating shaft 32 is driven to rotate by the driven gear 35, and then the two telescopic rods 11 are driven to synchronously rotate by the chain transmission between the first chain wheel 33 and the second chain wheel 34, so as to provide power for the rotation of the rotary drum 10.

In a further optimized scheme, the telescopic rod 11 comprises a plurality of sliding sleeves which are in sliding connection along the axial direction, the sizes of the plurality of sliding sleeves in the same telescopic rod 11 are gradually reduced, the sliding sleeve with the minimum size is fixedly connected with the rotary drum 10, and the sliding sleeve with the maximum size is fixedly connected with the second chain wheel 34. The telescopic rod 11 can be guaranteed to rotate under the action of the rotating part on the premise of maintaining the telescopic performance by sliding along the axis between the sliding sleeves, and then the rotating drum 10 is driven to rotate.

Further optimize the scheme, measure response subassembly 6 and be bridge health monitoring sensor, can detect the various parameters of bridge, this device is prior art, does not do the perusal once more.

The working process of the invention is as follows: when the device is used, the whole device is moved to a designated working area, then the measurement sensing assembly is checked to ensure normal work of the measurement sensing assembly, the telescopic electric cylinder 9 is started, the telescopic electric cylinder 9 drives the lifting seat 8 to move up and down rapidly, when the measurement sensing assembly is close to the optimal detection height, the device stops, then the rotating motor 36 is started, the rotating motor 36 is meshed with the driven gear 35 through the driving gear 37 to drive the rotating shaft 32 to rotate, further the telescopic rod 11 is driven to rotate through chain transmission between the first chain wheel 33 and the second chain wheel 34, further the rotary drum 10 is driven to rotate, the connecting plate 13 can be driven to move up and down due to the threaded connection between the rotary drum 10 and the connecting plate 13, further the height of the measurement sensing assembly is accurately adjusted to be stabilized at the optimal detection height, then the rotating plate 14 is driven to rotate through the adjusting motor, the push rod 16 is pulled or pushed through the adjusting rod 15 in the rotating process of the rotating plate 14, the sliding plate 4 is made to transversely slide on the side wall of the lifting plate 3, so as to adjust the distance between the two telescopic arms 5, thereby adjusting the distance between the two measurement induction components, so that the detection is suitable for detecting bridges with various sizes, then the control motor is started, the control motor drives the control gear 22 to rotate, further the sliding arm 20 is driven to move up and down through the rack, when the telescopic arms 5 extend, the air pump 30 pumps negative pressure in the second sliding groove 25, then the limiting block 26 moves into the first sliding groove 24 under the action of the negative pressure, the tension spring and the control gear 22, the limiting block 26 does not limit the rack, when the length is suitable, the control gear 22 is reversely rotated, meanwhile, air is blown into the second sliding groove 25 by the air pump 30, so that the limiting block 26 contacts with the rack under the action of the air and the control gear 22 to form clamping connection, thereby limiting and protecting the sliding arm 20, the stability of the device is improved.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims

1. The utility model provides a highway bridge bearing capacity detection device which characterized in that: include bottom plate (1) that can dismantle the connection with the transport vechicle, bottom plate (1) top surface both sides fixedly connected with backup pad (2) respectively, two backup pad (2) symmetry sets up, two be provided with lifter plate (3) between backup pad (2), lifter plate (3) both ends respectively with backup pad (2) correspond sliding connection, be provided with control in backup pad (2) the second grade lifting part of lifter plate (3) up-and-down motion, lifter plate (3) side both ends symmetry is provided with two sliding plates (4), sliding plate (4) with lifter plate (3) sliding connection, every equal fixedly connected with telescopic arm (5) on sliding plate (4), two are controlled to lifter plate (3) lateral wall the regulating part of distance between telescopic arm (5), be provided with its flexible control part and spacing portion of control in telescopic arm (5), telescopic arm (5) are kept away from the one end of sliding plate (4) is installed and is measured response subassembly (6).

2. The device for detecting the bearing capacity of the road bridge according to claim 1, wherein: second grade lift portion is including seting up in sliding chamber (7) in backup pad (2), sliding chamber (7) sliding connection has lift seat (8), sliding chamber (7) top fixed mounting has flexible electric jar (9), flexible electric jar (9) flexible end with lift seat (8) top fixed connection, lift seat (8) bottom is rotated and is connected with rotary drum (10), the one end of rotary drum (10) bottom fixedly connected with telescopic link (11), telescopic link (11) other end runs through sliding chamber (7) diapire and with sliding chamber (7) diapire rotates to be connected, install two in bottom plate (1) control telescopic link (11) synchronous rotation portion, sliding chamber (7) are close to holding tank (12) have been seted up to one side of lifter plate (3), the equal fixedly connected with in lifter plate (3) both sides (13), connecting plate (13) with holding tank (12) sliding connection, rotary drum (10) run through connecting plate (13) and with connecting plate (13) threaded connection.

3. The device for detecting the bearing capacity of the highway bridge according to claim 1, wherein: the adjusting part comprises a rotating sheet (14) located in the middle of the side wall of the lifting plate (3), the rotating sheet (14) is connected with the side wall of the lifting plate (3) in a rotating mode, connecting columns are fixedly connected with two ends of the rotating sheet (14), an adjusting rod (15) is connected to the connecting columns in a rotating mode, the sliding plate (4) is close to a push rod (16) fixedly connected with one side of the rotating sheet (14), the push rod (16) is connected with the adjusting rod (15) in a rotating mode, a limiting sleeve (17) is fixedly mounted on the side wall of the lifting plate (3) corresponding to the push rod (16), the push rod (16) penetrates through the limiting sleeve (17) and the limiting sleeve (17) in a sliding mode, an adjusting motor is fixedly mounted in the lifting plate (3), and an output shaft of the adjusting motor is fixedly connected with the rotating sheet (14).

4. The device for detecting the bearing capacity of the road bridge according to claim 1, wherein: the telescopic arm (5) comprises a supporting arm (18) fixedly connected with the sliding plate (4), a sliding groove (19) is formed in one side of the supporting arm (18), a sliding arm (20) is connected in the sliding groove (19) in a sliding mode, the measurement sensing assembly (6) is located at the end portion of the sliding arm (20), and the control portion and the limiting portion are located on the supporting arm (18).

5. The device for detecting the bearing capacity of the road bridge according to claim 4, wherein: the control part is including offering in control groove (21) of support arm (18), control groove (21) with spout (19) are linked together, control groove (21) internal rotation is connected with control gear (22), cursor slide (20) are close to recess (23) have been seted up to one side of control gear (22), fixedly connected with in recess (23) with the rack of control gear (22) engaged with, fixed mounting has control motor in support arm (18), the control motor output shaft with control gear (22) fixed connection.

6. The device for detecting the bearing capacity of the road bridge according to claim 5, wherein: the spacing portion is including offering first sliding tray (24) and second sliding tray (25) in support arm (18), first sliding tray (24) and second sliding tray (25) all with control groove (21) are linked together, sliding connection has stopper (26) in first sliding tray (24), stopper (26) with fixedly connected with tension spring (27) between first sliding tray (24) diapire, stopper (26) are close to one side of sliding arm (20) be provided with the joint of rack looks adaptation is protruding, stopper (26) are close to one side of control gear (22) seted up with control gear (22) engaged with's tooth's socket, stopper (26) top fixedly connected with baffle (28), sliding connection has in second sliding tray (25) and promotes piece (29), promote piece (29) with second sliding tray (25) looks adaptation, promote piece (29) with baffle (28) contact sets up, support arm (18) outside fixed mounting has air pump (30), air pump (30) and second sliding tray (25) one end are linked together.

7. The device for detecting the bearing capacity of the road bridge according to claim 2, wherein: rotation portion is including offering in chamber (31) that holds of bottom plate (1), telescopic link (11) bottom is located hold in chamber (31) and with hold chamber (31) inner wall and rotate and connect, it is connected with axis of rotation (32) to hold chamber (31) middle part rotation, two first sprocket (33) of fixedly connected with on axis of rotation (32), two telescopic link (11) are located hold the one end week side and the difference of chamber (31) first sprocket (33) correspond fixedly connected with second sprocket (34), first sprocket (33) and correspond second sprocket (34) pass through the chain drive, axis of rotation (32) middle part fixedly connected with driven gear (35), hold chamber (31) bottom fixedly connected with and rotate motor (36), rotate motor (36) output shaft fixedly connected with driving gear (37), driving gear (37) with driven gear (35) mesh mutually.

8. The device for detecting the bearing capacity of the road bridge according to claim 7, wherein: the telescopic rod (11) comprises a plurality of sliding sleeves which are connected in a sliding mode along the axial direction, the sizes of the sliding sleeves in the same telescopic rod (11) are gradually reduced, the sliding sleeve with the minimum size is fixedly connected with the rotary drum (10), and the sliding sleeve with the maximum size is fixedly connected with the second chain wheel (34).