CN214738116U

CN214738116U - Bridge is faced excavation of water foundation ditch and is propped up retaining wall device

Info

Publication number: CN214738116U
Application number: CN202120722325.6U
Authority: CN
Inventors: 邢佰强
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2021-11-16
Anticipated expiration: 2031-04-09

Abstract

The utility model discloses a bridge is close to water foundation ditch excavation retaining wall device, including retaining wall device body, retaining wall device body comprises a plurality of U-shaped supporting plates lock one by one, the inboard of retaining wall device body is provided with consolidates supporting mechanism, it includes two first branches and two second branches to consolidate supporting mechanism, and two second branches are located between two first branches, and one side movable contact that front end and rear end of second branch are close to each other with two first branches respectively is equipped with two sets of adjustable supporting mechanism between two second branches. The utility model relates to a rationally, be convenient for to the inboard reinforcement support of a revetment device body that a plurality of U-shaped backplate are constituteed, and be convenient for to consolidating the strutting arrangement dismouting, reduce the phenomenon of revetment device body to inboard slope behind the excavation of foundation ditch upper portion part partly, improve and strut stability, satisfy the user demand.

Description

Bridge is faced excavation of water foundation ditch and is propped up retaining wall device

Technical Field

The utility model relates to a buttress wall technical field especially relates to a bridge is close to foundation ditch excavation buttress wall device of water.

Background

A bridge, which is generally a structure erected on rivers, lakes and seas to enable vehicles, pedestrians and the like to smoothly pass through; with the development of society, more and more bridges are continuously renovated, foundation excavation and pile driving are inevitably carried out at positions close to water in the renovating and building process of the bridges, and supporting protection is required by means of supporting walls during foundation pit excavation so as to prevent the phenomenon that a soil layer close to water is deformed and collapsed; the existing bridge near-water foundation pit excavation supporting wall is mostly formed by mutually buckling a plurality of U-shaped supporting plates to form a retaining frame, the U-shaped supporting plates are mostly driven into the ground by adopting a hydraulic vibration hammer instrument in the prior art, the U-shaped supporting plates are pulled out by adopting a hydraulic vibration hammer subsequently, the U-shaped supporting plates are driven into the ground to form a mutual buckling state, a frame type supporting wall surrounding a foundation pit is formed, and then the foundation pit can be excavated.

In the existing device for excavating the supporting wall of the bridge near-water foundation pit, after the upper part of the supporting wall is excavated, because soil is excavated, the upper part of the inner side of the supporting wall is suspended, and a plurality of U-shaped supporting plates forming the supporting wall are easy to incline towards the middle; it lacks the function to the inboard reinforcement support of retaining wall, and stability is lower, in case incline or topple over seriously to the inboard side, then leads to the foundation ditch can't continue excavation work, can not satisfy the user demand, to this phenomenon, therefore we have proposed a bridge foundation ditch excavation retaining wall device that is close to water for solve above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the shortcoming that exists among the prior art, and the bridge that proposes is close to water foundation ditch excavation retaining wall device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a supporting wall device for excavation of a bridge near-water foundation pit comprises a supporting wall device body, wherein the supporting wall device body is formed by buckling a plurality of U-shaped supporting plates one by one, a reinforcing and supporting mechanism is arranged on the inner side of the supporting wall device body and comprises two first supporting rods and two second supporting rods, the two second supporting rods are located between the two first supporting rods, the front ends and the rear ends of the second supporting rods are respectively in movable contact with one side, close to the two first supporting rods, of each other, and two groups of adjustable supporting mechanisms are arranged between the two second supporting rods;

the adjustable supporting mechanism comprises a rectangular box arranged between two second supporting rods, one side, close to each other, of each rectangular box is provided with an opening, one side, close to each other, of each second supporting rod is provided with two clamping grooves, the two sides of each rectangular box are fixedly connected with transverse pipes, transverse rods are sleeved in the transverse pipes in a sliding mode, one ends, far away from the corresponding rectangular boxes, of the transverse rods extend out of the transverse pipes and are fixedly connected with limiting blocks, one sides, near the corresponding second supporting rods, of the limiting blocks are movably contacted with the second supporting rods, one sides, far away from the corresponding rectangular boxes, of the limiting blocks are fixedly connected with clamping blocks, the clamping blocks are clamped with the corresponding clamping grooves, one ends, near the corresponding rectangular boxes, of the transverse rods are provided with rectangular grooves, rectangular blocks are sleeved in the rectangular grooves in a sliding mode, one sides, near the corresponding rectangular boxes, of the rectangular blocks are rotatably provided with screw rods, nuts are sleeved in the rectangular grooves in a welding mode, and the nut threads are sleeved on the corresponding screw rods, the screw rod rotates and installs in the violently pipe that corresponds, the one end that the corresponding rectangular block was kept away from to the screw rod extends to in the rectangular box and the first bevel gear of fixedly connected with, two first bevel gear symmetry settings that are located in same rectangular box, it has same second bevel gear to be located to mesh between two first bevel gear in the same rectangular box, the equal fixedly connected with pivot in one side that two second bevel gears are close to each other, the one end that corresponding second bevel gear was kept away from in the pivot extends to outside the rectangular box and fixedly connected with knob, the outside of knob is four handle bars of annular equidistant fixedly connected with, the equal fixedly connected with apron in one side that two rectangular boxes are close to each other, the apron rotates the cover and establishes in the pivot that corresponds.

Preferably, a first strut located on the rear side of the two first struts is screwed to the front sides of the plurality of U-shaped supporting and protecting plates on the rear side, a first strut located on the front side is screwed to the rear sides of the plurality of U-shaped supporting and protecting plates on the front side, a second strut located on the left side is screwed to the right sides of the plurality of U-shaped supporting and protecting plates on the left side, and a second strut located on the right side is screwed to the left sides of the plurality of U-shaped supporting and protecting plates on the right side.

Preferably, two U-shaped backplate in the a plurality of U-shaped backplate that are located the front side, two U-shaped backplate in a plurality of U-shaped backplate that are located the rear side, two U-shaped backplate that are located a plurality of U-shaped backplate on left and be located a plurality of U-shaped backplate on right side all seted up threaded hole on two U-shaped backplate in a plurality of U-shaped backplate, threaded hole endotheca is equipped with T shape bolt, and two bolt perforation have all been seted up to one side that two first branch poles are close to each other and one side that two second branch poles are close to each other, and the outside swing joint of the fenestrate inner wall of bolt and the T shape bolt that corresponds.

Preferably, one side of the rectangular block, which is close to the corresponding rectangular box, is fixedly connected with a first bearing, and the inner ring of the first bearing is welded and sleeved with the outer side of the corresponding screw rod.

Preferably, the same second bearing is fixedly connected between the front side inner wall and the rear side inner wall of the transverse pipe, and the inner ring of the second bearing is welded and sleeved with the outer side of the corresponding screw rod.

Preferably, the limiting groove is formed in one side, away from each other, of the two transverse rods which are opposite in the front-back direction, the limiting blocks are fixedly connected to the inner wall, away from each other, of one side of the two transverse rods which are opposite in the front-back direction, and the limiting blocks are connected with the corresponding limiting grooves in a sliding mode.

Preferably, the rear side of the cover plate is provided with a first round hole, a third bearing is fixedly sleeved in the first round hole, and an inner ring of the third bearing is welded and sleeved with the outer side of the corresponding rotating shaft.

Preferably, the inner walls of the two sides of the rectangular box are provided with second round holes, and the screw rods are located in the corresponding second round holes and are not in contact with the inner walls of the second round holes.

Compared with the prior art, the beneficial effects of the utility model are that:

the purpose of reinforcing and supporting the inner side of the support wall device body is realized through the matching of the two first supporting rods, the two second supporting rods and the two groups of adjustable supporting mechanisms;

during installation, after a part of the upper part of a foundation pit is excavated, two first supporting rods are respectively fixed on a plurality of U-shaped supporting plates positioned on the front side and the rear side through two T-shaped bolts, two second supporting rods are respectively fixed on a plurality of U-shaped supporting plates positioned on the left side and the right side through two T-shaped bolts, a handle rod is pulled to drive a corresponding knob to rotate in the forward direction, the knob drives a second bevel gear to rotate through a corresponding rotating shaft, the second bevel gear drives two screw rods to rotate through two corresponding first bevel gears, the screw rods can drive corresponding nuts to move in the direction far away from a rectangular box through rotation, the nuts drive corresponding transverse rods to slide in a transverse pipe in the direction far away from the rectangular box, the transverse rods drive corresponding rectangular grooves to slide on rectangular blocks, the transverse rods drive clamping blocks to be clamped with clamping grooves through corresponding limiting blocks, and the limiting blocks on the two sides support the two second supporting rods in the middle, the installation is accomplished, and when follow-up needs are demolishd, then the reverse rotation knob, the stopper change into the direction removal to being close to the rectangle box that corresponds this moment to drive the fixture block and the draw-in groove separation that corresponds, alright tear a plurality of T shape bolts down this moment, can accomplish the dismantlement of consolidating the supporting mechanism, the convenience is to consolidating the strutting arrangement dismouting.

The utility model relates to a rationally, be convenient for to the inboard reinforcement support of a revetment device body that a plurality of U-shaped backplate are constituteed, and be convenient for to consolidating the strutting arrangement dismouting, reduce the phenomenon of revetment device body to inboard slope behind the excavation of foundation ditch upper portion part partly, improve and strut stability, satisfy the user demand.

Drawings

Fig. 1 is a schematic view of a top view structure of a device for excavating a supporting wall of a foundation pit near water of a bridge, which is provided by the utility model;

fig. 2 is an enlarged sectional view of a portion a in fig. 1.

In the figure: the device comprises a 100U-shaped supporting plate, a 1 second supporting rod, a 2 first supporting rod, a 3 clamping groove, a 4 rectangular box, a 5 transverse pipe, a 6 transverse rod, a 7 limiting block, an 8 clamping block, a 9 rectangular groove, a 10 rectangular block, an 11 screw rod, a 12 nut, a 13 first bevel gear, a 14 second bevel gear, a 15 rotating shaft, a 16 knob and a 17T-shaped bolt.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-2, a supporting wall device for excavation of a bridge near-water foundation pit comprises a supporting wall device body, wherein the supporting wall device body is formed by buckling a plurality of U-shaped supporting plates 100 one by one, a reinforcing and supporting mechanism is arranged on the inner side of the supporting wall device body, the reinforcing and supporting mechanism comprises two first supporting rods 2 and two second supporting rods 1, the two second supporting rods 1 are positioned between the two first supporting rods 2, the front end and the rear end of each second supporting rod 1 are respectively in movable contact with one side, close to the two first supporting rods 2, and two groups of adjustable supporting mechanisms are arranged between the two second supporting rods 1;

the adjustable supporting mechanism comprises rectangular boxes 4 arranged between two second supporting rods 1, one side, close to each other, of each rectangular box 4 is provided with an opening, one side, close to each other, of each second supporting rod 1 is provided with two clamping grooves 3, two sides of each rectangular box 4 are fixedly connected with transverse pipes 5, each transverse pipe 5 is sleeved with a transverse rod 6 in a sliding mode, one end, far away from the corresponding rectangular box 4, of each transverse rod 6 extends out of each transverse pipe 5 and is fixedly connected with a limiting block 7, one side, close to the corresponding second supporting rod 1, of each limiting block 7 is in movable contact with the corresponding second supporting rod 1, one side, far away from the corresponding rectangular box 4, of each limiting block 7 is fixedly connected with a clamping block 8, each clamping block 8 is clamped with the corresponding clamping groove 3, one end, close to the corresponding rectangular box 4, of each transverse rod 6 is provided with a rectangular groove 9, a rectangular block 10 is sleeved in each rectangular groove 9 in a sliding mode, one side, close to the corresponding rectangular box 4, of each rectangular block 10 is rotatably provided with a screw rod 11, the nut 12 is welded in the rectangular groove 9, the nut 12 is screwed on the corresponding screw rod 11, the screw rod 11 is rotatably mounted in the corresponding transverse pipe 5, one end of the screw rod 11 far away from the corresponding rectangular block 10 extends into the rectangular box 4 and is fixedly connected with a first bevel gear 13, two first bevel gears 13 in the same rectangular box 4 are symmetrically arranged, the same second bevel gear 14 is meshed between the two first bevel gears 13 in the same rectangular box 4, one sides of the two second bevel gears 14 close to each other are fixedly connected with a rotating shaft 15, one end of the rotating shaft 15 far away from the corresponding second bevel gear 14 extends out of the rectangular box 4 and is fixedly connected with a knob 16, the outer side of the knob 16 is fixedly connected with four handle rods at equal intervals in a ring shape, one sides of the two rectangular boxes 4 close to each other are fixedly connected with a cover plate, the cover plate is rotatably sleeved on the corresponding rotating shaft 15, the utility model relates to a rationally, be convenient for to the inboard reinforcement support of retaining wall device body that a plurality of U-shaped supporting plates 100 are constituteed, and be convenient for to consolidating the strutting arrangement dismouting, reduce the phenomenon of retaining wall device body to the inboard slope after excavation of foundation ditch upper portion is partly, improve and strut stability, satisfy the user demand.

The utility model discloses in, 2 threaded fastening of first branch that are located the rear side in two first branches 2 are in the front side of a plurality of U-shaped supporting plates 100 of rear side, 2 threaded fastening of first branch that are located the front side are in the rear side of a plurality of U-shaped supporting plates 100 of front side, be located the right side of 1 threaded fastening of left second branch at left a plurality of U-shaped supporting plates 100, be located the left side of a plurality of U-shaped supporting plates 100 of right side, be located two U-shaped supporting plates 100 in a plurality of U-shaped supporting plates 100 of front side, be located two U-shaped supporting plates 100 in a plurality of U-shaped supporting plates 100 of rear side, be located two U-shaped supporting plates 100 in a plurality of U-shaped supporting plates 100 of left, and be located all seted up threaded hole on two U-shaped supporting plates 100 in a plurality of U-shaped supporting plates 100 on right side, the threaded hole cover is equipped with T-shaped bolt 17, one side that two first branches 2 are close to each other and one side that two second branches 1 are close to each other are all seted up Two bolt through holes, the inner walls of the bolt through holes are in movable contact with the outer sides of corresponding T-shaped bolts 17, one side, close to a corresponding rectangular box 4, of each rectangular block 10 is fixedly connected with a first bearing, the inner ring of each first bearing is welded and sleeved with the outer side of a corresponding screw rod 11, the same second bearing is fixedly connected between the inner wall at the front side and the inner wall at the rear side of each transverse pipe 5, the inner ring of each second bearing is welded and sleeved with the outer side of a corresponding screw rod 11, one side, away from each other, of each front transverse rod 6 and one side, away from each other, of each transverse pipe 5, opposite to each front transverse rod and the other, each inner wall at one side, away from each other, of each front transverse pipe 5 and the other, each limiting block is connected with a corresponding limiting groove in a sliding manner, a first round hole is formed in the rear side of the cover plate, a third bearing is fixedly sleeved in the first round hole, the inner ring of the third bearing is welded and sleeved with the outer side of a corresponding rotating shaft 15, second round holes are formed in the inner walls at two sides of the rectangular box 4, screw rod 11 is located the second round hole that corresponds and contactless with the inner wall of second round hole, the utility model relates to a rationally, be convenient for consolidate the support to the retaining wall device body inboard that a plurality of U-shaped supporting plates 100 are constituteed, and be convenient for to consolidating the strutting arrangement dismouting, reduce the phenomenon of retaining wall device body to the inboard slope behind the excavation of foundation ditch upper portion part, improve and strut stability, satisfy the user demand.

The working principle is as follows: when the device is used, the two second supporting rods 1 are positioned between the two first supporting rods 2, at the moment, the two second supporting rods 1 support the two first supporting rods 2 to prevent the two first supporting rods 2 from displacing towards the middle, so that the U-shaped supporting plates 100 on the rear side and the front side are prevented from inclining towards the inner side, the two groups of adjustable supporting mechanisms support the two second supporting rods 1 at the middle, the two second supporting rods 1 can be prevented from displacing towards the middle, so that the U-shaped supporting plates 100 on the left side and the right side are prevented from inclining towards the inner side, and the purpose of reinforcing and supporting the inner side of the supporting wall device body is realized under the matching of the two first supporting rods 2, the two second supporting rods 1 and the two groups of adjustable supporting mechanisms;

the installation of the reinforcing and supporting mechanism is that after a part of the upper part of a foundation pit formed in the interior of a supporting wall device body is excavated, namely after a part of the upper part of the foundation pit is excavated, in order to prevent the U-shaped supporting plates 100 from inclining inwards due to the disappearance of soil on the upper part, after a part of the upper part of the foundation pit is excavated, before the installation, the clamping blocks 8 and the clamping grooves 3 are in an unclamped state, firstly, two first supporting rods 2 are respectively fixed on a plurality of U-shaped supporting plates 100 positioned on the front side and the rear side through two T-shaped bolts 17, two second supporting rods 1 are respectively fixed on a plurality of U-shaped supporting plates 100 positioned on the left side and the right side through two T-shaped bolts 17, then, a handle rod is pulled to drive a corresponding knob 16 to rotate in a forward direction, the knob 16 drives a second bevel gear 14 to rotate through a corresponding rotating shaft 15, the second bevel gear 14 drives two first bevel gears 13 meshed with the second bevel gear 13 to rotate in an opposite direction, the first bevel gear 13 drives the corresponding screw rod 11 to rotate on the rectangular block 10, the screw rod 11 can drive the corresponding nut 12 to move in a direction away from the rectangular box 4 by rotating, the nut 12 drives the corresponding cross rod 6 to slide in a direction away from the rectangular box 4 in the transverse pipe 5, the cross rod 6 drives the corresponding rectangular groove 9 to slide on the rectangular block 10, meanwhile, the cross rod 6 drives the corresponding limiting block 7 to gradually move to be in contact with the second supporting rod 1, the limiting block 7 drives the corresponding clamping block 8 to be clamped with the clamping groove 3, at the moment, the knob 16 stops rotating, under the self-thread locking force of the screw rod 11 and the nut 12, the position fixing of the limiting block 7 is realized, the installation is completed, at the moment, the limiting blocks 7 on the two sides support the two second supporting rods 1 in the middle, the two second supporting rods 1 are prevented from moving towards the middle, and the reinforcing support for the inner side of the supporting wall device body is realized;

after the use, when needing to demolish, then the reverse rotation knob 16, the motion direction that rotates knob 16 with above-mentioned forward is opposite with the same reason, and stopper 7 changes into and removes to the direction that is close to corresponding rectangle box 4 this moment to drive the separation of fixture block 8 and the draw-in groove 3 that corresponds, make things convenient for personnel to dismantle adjustable supporting mechanism fast, alright tear a plurality of T shape bolts 17 down this moment, can accomplish the dismantlement of consolidating supporting mechanism.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A supporting wall device for excavation of a bridge near-water foundation pit comprises a supporting wall device body, wherein the supporting wall device body is formed by buckling a plurality of U-shaped supporting plates (100) one by one, and the supporting wall device is characterized in that a reinforcing and supporting mechanism is arranged on the inner side of the supporting wall device body and comprises two first supporting rods (2) and two second supporting rods (1), the two second supporting rods (1) are located between the two first supporting rods (2), the front ends and the rear ends of the second supporting rods (1) are respectively in movable contact with one sides, close to the two first supporting rods (2), of the two first supporting rods (2), and two groups of adjustable supporting mechanisms are arranged between the two second supporting rods (1);

the adjustable supporting mechanism comprises rectangular boxes (4) arranged between two second supporting rods (1), one side, close to each other, of each rectangular box (4) is provided with an opening, one side, close to each other, of each second supporting rod (1) is provided with two clamping grooves (3), two sides of each rectangular box (4) are fixedly connected with transverse pipes (5), each transverse pipe (5) is internally provided with a transverse rod (6) in a sliding sleeve mode, one end, far away from the corresponding rectangular box (4), of each transverse rod (6) extends out of each transverse pipe (5) and is fixedly connected with a limiting block (7), one side, close to the corresponding second supporting rod (1), of each limiting block (7) is in movable contact with the corresponding second supporting rod (1), one side, far away from the corresponding rectangular box (4), of each limiting block (7) is fixedly connected with a clamping block (8), each clamping block (8) is clamped with the corresponding clamping groove (3), one end, close to the corresponding rectangular box (4), of each transverse rod (6) is provided with a rectangular groove (9), and the sliding sleeve is equipped with rectangular block (10) in rectangular channel (9), one side that rectangular block (10) is close to corresponding rectangular box (4) is rotated and is installed screw rod (11), welding sleeve is equipped with nut (12) in rectangular channel (9), and nut (12) threaded sleeve is established on corresponding screw rod (11), screw rod (11) are rotated and are installed in corresponding violently pipe (5), the one end that corresponding rectangular block (10) was kept away from in screw rod (11) extends to in rectangular box (4) and fixedly connected with first bevel gear (13), two first bevel gear (13) that are located in same rectangular box (4) symmetry set up, it has same second bevel gear (14) to be located to mesh between two first bevel gear (13) in same rectangular box (4), the equal fixedly connected with pivot (15) in one side that two second bevel gear (14) are close to each other, the one end that corresponding second bevel gear (14) was kept away from in pivot (15) extends to outside rectangular box (4) and outside and the rectangular box (4) and the pivot (15) are Fixedly connected with knob (16), the outside of knob (16) is four handle bars of annular equidistant fixedly connected with, and the equal fixedly connected with apron in one side that two rectangle boxes (4) are close to each other, and the apron rotates the cover and establishes on corresponding pivot (15).

2. The bridge waterside foundation pit excavation supporting wall device according to claim 1, characterized in that, the first supporting rod (2) located at the rear side of the two first supporting rods (2) is fixed at the front side of the plurality of U-shaped supporting plates (100) at the rear side through threads, the first supporting rod (2) located at the front side is fixed at the rear side of the plurality of U-shaped supporting plates (100) at the front side through threads, the second supporting rod (1) located at the left side is fixed at the right side of the plurality of U-shaped supporting plates (100) at the left side through threads, and the second supporting rod (1) located at the right side is fixed at the left side of the plurality of U-shaped supporting plates (100) at the right side through threads.

3. The bridge waterside foundation pit excavation supporting wall device according to claim 2, wherein two U-shaped supporting plates (100) in the plurality of U-shaped supporting plates (100) on the front side, two U-shaped supporting plates (100) in the plurality of U-shaped supporting plates (100) on the rear side, two U-shaped supporting plates (100) in the plurality of U-shaped supporting plates (100) on the left side, and two U-shaped supporting plates (100) in the plurality of U-shaped supporting plates (100) on the right side are all provided with threaded holes, T-shaped bolts (17) are sleeved in the threaded holes, two bolt perforations are respectively arranged on one side, close to each other, of the two first supporting rods (2) and one side, close to each other, of the two second supporting rods (1), and inner walls of the bolt perforations are in movable contact with outer sides of the corresponding T-shaped bolts (17).

4. The bridge waterside foundation pit excavation supporting wall device according to claim 1, wherein one side of the rectangular block (10) close to the corresponding rectangular box (4) is fixedly connected with a first bearing, and an inner ring of the first bearing is welded and sleeved with the outer side of the corresponding screw rod (11).

5. The bridge waterside foundation pit excavation supporting wall device according to claim 1, wherein the same second bearing is fixedly connected between the front inner wall and the rear inner wall of the transverse pipe (5), and an inner ring of the second bearing is welded and sleeved with the outer side of the corresponding screw rod (11).

6. The bridge near-water foundation pit excavation supporting wall device as claimed in claim 1, wherein limiting grooves are formed in the sides, away from each other, of the two transverse rods (6) which are opposite from the front and the back, limiting blocks are fixedly connected to the inner walls, away from each other, of the two transverse pipes (5) which are opposite from the front and the back, and the limiting blocks are slidably connected with the corresponding limiting grooves.

7. The device for excavating and supporting a bridge near-water foundation pit according to claim 1, wherein a first circular hole is formed in the rear side of the cover plate, a third bearing is fixedly sleeved in the first circular hole, and an inner ring of the third bearing is welded and sleeved with the outer side of the corresponding rotating shaft (15).

8. The device for excavating and supporting a bridge near-water foundation pit according to claim 1, wherein second circular holes are formed in the inner walls of two sides of the rectangular box (4), and the screw rods (11) are located in the corresponding second circular holes and are not in contact with the inner walls of the second circular holes.