CN220414033U

CN220414033U - Back pressure device

Info

Publication number: CN220414033U
Application number: CN202320918566.7U
Authority: CN
Inventors: 赖泽云; 赵性营; 李敏; 朱寒松; 郭玉鹏; 胡云峰
Original assignee: Huadong Construction Co ltd Of China Railway No3 Engineering Group Co ltd; China Railway No 3 Engineering Group Co Ltd
Current assignee: Huadong Construction Co ltd Of China Railway No3 Engineering Group Co ltd; China Railway No 3 Engineering Group Co Ltd
Priority date: 2023-04-21
Filing date: 2023-04-21
Publication date: 2024-01-30
Anticipated expiration: 2033-04-21

Abstract

The utility model discloses a back pressure device, which comprises a bridge pier, a bridge, a bottom plate, a jacking unit and a plurality of supporting components, wherein the bridge is erected above the bridge pier, the bottom plate is paved on the bridge pier, the jacking unit is removably arranged on the bottom plate, the jacking unit is used for temporarily jacking a support to the bottom of the bridge, the plurality of supporting components are arranged on the periphery of the jacking unit in a surrounding mode, each supporting component comprises an outer sleeve piece and an inner part, the outer sleeve piece is arranged on the bottom plate, and the inner part is in threaded connection with the outer sleeve piece, so that the height of the inner part can be adjusted, and the support can be permanently jacked on the bottom of the bridge. The back pressure device only can not lift the bridge during construction, so that disturbance to the bridge structure is greatly reduced, and the safety and stability of the existing bridge are better protected; compression deformation of the support and settlement of the lower foundation can be eliminated in advance, the purpose of accurately falling beams is achieved, and stability and safety can be further improved.

Description

Back pressure device

Technical Field

The utility model relates to the technical field of bridge engineering, in particular to a back pressure device.

Background

The bridge support is an important structural component for connecting the upper structure and the lower structure of the bridge, can reliably transfer the load and deformation (displacement and rotation angle) born by the upper structure of the bridge to the lower structure of the bridge, and is an important force transmission component of the bridge.

With the development and utilization of urban underground space and large-scale development, new engineering wears existing bridges, and the lower foundation of the existing bridges needs to be underpinned; or, the bridge support is also required to be replaced due to the fact that the bridge support is affected by the field environment and is aged and excessively deformed. If the contact surface between the support and the bottom of the bridge is poor, the bridge is slightly cracked, and the use of the bridge is affected by heavy weight, so that how accurate recovery of the support and the beam body after underpinning or replacement is important. The conventional mode is a scheme that Liang Tiding L of 1-2cm is plugged into a support and then falls back to a beam body, and the mode can cause damage to the existing beam body (particularly a continuous beam), and meanwhile, the elevation of the beam body after falling back is difficult to accurately control.

Therefore, how to better protect the safety and stability of the existing bridge, and simultaneously eliminate the compression deformation of the support and the settlement of the lower foundation in advance, thereby achieving the aims of accurate beam falling and no subsequent settlement, and being an important problem to be solved at present.

Disclosure of Invention

The utility model aims to provide a back pressure device which is used for solving the problems of disturbance and accurate falling-back of the existing bridge in the processes of bridge underpinning, support replacement and the like.

The utility model adopts the following technical scheme:

the utility model provides a back pressure device, includes pier and bridge, the bridge erects the top of pier still includes:

the bottom plate is paved on the bridge pier;

the jacking unit is arranged on the bottom plate in a removable mode and is used for temporarily jacking the support to the bottom of the bridge;

the supporting components are arranged on the periphery of the jacking unit in a surrounding mode, the supporting components comprise an outer sleeve piece and an inner piece, the outer sleeve piece is arranged on the bottom plate, the inner piece is in threaded connection with the outer sleeve piece, the height of the inner piece is adjustable, and therefore the support is permanently propped against the bottom of the bridge.

In an alternative scheme, the bottom plate is a steel plate, and the thickness of the bottom plate is not less than 1cm.

In an alternative scheme, a plurality of fixing legs are arranged below the bottom plate, and the fixing legs are embedded in the bridge pier.

In an alternative scheme, the fixed leg is round steel, and the diameter of the fixed leg is not less than 2cm and the height is not less than 8cm.

In an alternative scheme, a positioning groove is formed in the central area of the bottom plate, and the positioning groove is matched with the jacking unit; or,

and an installation identification position is arranged in the central area of the bottom plate.

In an alternative scheme, the jacking unit is a thin-wall jack, and a hydraulic system is externally connected with the jacking unit.

In an alternative, the hydraulic system includes a hydraulic manual pump and an oil pipe, and the hydraulic manual pump is connected with the jacking unit through the oil pipe.

In an alternative, the strength level of the outer sleeve member and the inner sleeve member is from 8.8 to 10.9.

In an alternative, the external sleeve is a nut or a threaded sleeve, and the internal member is a bolt or a threaded post.

In an alternative, the surfaces of the base plate and the support assembly are each provided with a corrosion resistant layer.

Compared with the prior art, the utility model has the beneficial effects that at least:

1. the bridge is only jacked up and not lifted during construction, so that disturbance to a bridge structure is greatly reduced, and the safety and stability of the existing bridge are better protected.

2. Compression deformation of the support and settlement of the lower foundation can be eliminated in advance, the purpose of accurately falling beams is achieved, and stability and safety can be further improved.

3. The device is simple and convenient to operate, the construction period can be greatly shortened, the construction efficiency is improved, and the manufacturing and using costs of the device are low.

Drawings

Figure 1 is a schematic view of the structure of a counter-pressure device according to an embodiment of the utility model.

Figure 2 is a schematic representation of the use of a counter-pressure device according to an embodiment of the utility model.

Fig. 3 is a schematic diagram of the jacking state of the jacking unit in the back pressure device.

Figure 4 is a schematic view of the jacking unit in the counter-pressure apparatus in cooperation with the support assembly to support the support.

Figure 5 is a schematic view of the jacking unit in the counter-pressure apparatus in a retracted state.

In the figure: 1. pier, 2, bridge, 3, bottom plate, 4, jacking unit, 5, supporting component, 51, jacket spare, 52, built-in spare, 6, support, 7, fixed leg, 8, hydraulic pressure manual pump, 9, oil pipe.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.

The words expressing the positions and directions described in the present utility model are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present utility model.

Referring to fig. 1 to 2, the utility model provides a back pressure device, which comprises a bridge pier 1 and a bridge 2, wherein the bridge 2 is erected above the bridge pier 1, and further comprises a bottom plate 3, a jacking unit 4 and a plurality of supporting components 5.

Wherein, the bottom plate 3 is laid on pier 1 and can adopt the levelling rod to make level to make bottom plate 3 be in the horizontality, provide reliable basic assurance for follow-up construction. Through mounting plate 3, can increase jacking unit 4 and/or supporting component 5 reaction to pier 1's area and dispersion pressure, avoid pier 1 local bearing's load too big and cause damage or subsidence, improve stability and the security of supporting.

It will be appreciated that, to meet the above requirements, the base plate 3 needs to have better strength and bearing capacity, and in some embodiments, the base plate 3 is a steel plate, the steel plate is fixedly installed on the surface of the pier 1, and the thickness of the base plate 3 is not less than 1cm, and illustratively, the thickness of the steel plate may be 1cm, 1.2cm, 1.4cm, 2cm, and the like, so as to ensure good strength and bearing capacity of the steel plate itself.

The jacking unit 4 is removably arranged on the bottom plate 3, that is, the jacking unit 4 and the bottom plate 3 are separable, and as an example, a positioning groove (not shown) matched with the jacking unit 4 can be arranged on the bottom plate 3, and the jacking unit 4 is installed in the groove; alternatively, the installation identification position (not shown) is directly arranged on the bottom plate 3, and the jacking unit 4 is directly arranged on the installation identification position. The positioning groove or the mounting mark position is preferable to the central area of the bottom plate 3, so that the jacking unit 4 provides more balanced jacking force for the support 6, and the stability and safety of the support 6 in the jacking process are improved.

The jacking unit 4 is used for temporarily jacking the support 6 to the bottom of the bridge 2, and the jacking unit 4 is preferably a hydraulic jacking device in consideration of the weight of the bridge 2 and the reliability of jacking construction, for example, the jacking unit 4 is a thin-wall type jack, and the thin-wall type jack is small in size, flexible in operation and suitable for being used in a narrow operation environment. In addition, this jacking unit 4 is connected hydraulic system to control jacking unit 4, and as the preferred, hydraulic system includes hydraulic manual pump 8 and oil pipe 9, and hydraulic manual pump 8 passes through oil pipe 9 to be connected with jacking unit 4, and this hydraulic system easy operation, convenient to carry and use cost are lower.

It should be noted that, the jacking unit 4 only plays a role of temporary support, and for the bridge 2, the jacking unit 4 only does not lift the bridge, so as to greatly reduce disturbance to the structure of the bridge 2, thereby better protecting the safety and stability of the existing bridge 2.

The support assembly 5 serves as an actual support member for permanently supporting the support 6 against the bottom of the bridge 2, and a plurality of support assemblies 5 may be disposed around the outer circumference of the jacking unit 4 for improving the stability and reliability of the support, and illustratively, three, four, five or more support assemblies 5 may be uniformly disposed around the outer circumference of the jacking unit 4.

Specifically, the supporting component 5 comprises an outer sleeve member 51 and an inner member 52, the outer sleeve member 51 is arranged on the bottom plate 3, the inner member 52 is in threaded connection with the outer sleeve member 51, so that the height of the inner member 52 is adjustable, the support 6 can be tightly propped against the bottom of the bridge 2 by adjusting the height of the inner member 52, the compression deformation of the support 6 and the settlement of the lower foundation are eliminated in advance, the purpose of accurately falling beams is achieved, and the stability and safety can be further improved. In some embodiments, the outer sleeve member 51 may be a nut welded on the bottom plate 3, the built-in member 52 may be a bolt screwed with the nut, or the outer sleeve member 51 may be a threaded sleeve welded on the bottom plate 3, the built-in member 52 may be a threaded post screwed with the nut, and the bolt or the threaded post may be twisted by a wrench, a vice, or the like to tightly press against the support 6.

Referring to fig. 1 to 5, the construction flow of the back pressure device is as follows:

s1, mounting a bottom plate 3 on the surface of a pier 1 and leveling the surface;

s2, placing the jacking unit 4 on the bottom plate 3 and connecting a hydraulic system;

s3, placing the support 6 on the jacking unit 4, and adjusting the direction and the position of the support 6;

s4, starting oil feeding work by the hydraulic system, and jacking the support 6 to the beam bottom by the jacking unit 4 (see figure 3);

s5, adjusting the height of the supporting component 5 by using a tool, so that the built-in piece 52 is tightly propped against the support 6 (see fig. 4);

s6, the hydraulic system returns oil to control the jacking unit 4 to reset, the supporting assembly 5 supports the supporting seat 6, and the jacking unit 4 is taken out from the bottom plate 3 (see figure 5).

Referring to fig. 2, in a preferred embodiment, a plurality of fixing legs 7 are disposed below the base plate 3, the fixing legs 7 and the base plate 3 can be welded and fixed, the fixing legs 7 are pre-buried in the pier 1, specifically, before the fixing legs 7 are pre-buried, concrete is firstly perforated and poured on the pier 1, the fixing legs 7 are inserted into holes and the base plate 3 is leveled, and the pre-burying operation of the fixing legs 7 is completed after the concrete strength reaches the requirement, so that the binding force between the base plate 3 and the pier 1 is improved, and the stability of the base plate 3 after being mounted is ensured.

Preferably, the fixing legs 7 are made of round steel, the round steel has high strength and good bending resistance, the base plate 3 can be well prevented from being deviated, and the stability of the support is ensured. The diameter of the fixing leg 7 is not less than 2cm and the height is not less than 8cm, for example, the diameter of the fixing leg 7 is 2.4cm and the height is 8cm, or the diameter of the fixing leg 7 is 2.6cm and the height is 9cm, etc.

In a preferred embodiment, the strength levels of the external sleeve 51 and the internal member 52 are 8.8-10.9 to ensure that the support assembly 5 has sufficient strength to withstand the load of the bridge 2, and may be, for example, 8.8, 9.8, 10.9 or even 12.9.

In a preferred embodiment, the surfaces of the base plate 3 and the support assembly 5 are provided with corrosion resistant layers to avoid corrosion problems caused by long-term exposure of the base plate 3 and the support assembly 5 to the open air, and to extend the service life and the safety of the back pressure device. As an example, the corrosion-resistant layer may be a galvanized layer or a paint layer, which has the advantages of low cost and good corrosion resistance.

While embodiments of the present utility model have been shown and described, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that changes, modifications, substitutions and alterations may be made therein by those of ordinary skill in the art without departing from the spirit and scope of the utility model, all such changes being within the scope of the appended claims.

Claims

1. The utility model provides a back pressure device, includes pier (1) and bridge (2), bridge (2) erect in the top of pier (1), its characterized in that still includes:

a bottom plate (3), wherein the bottom plate (3) is paved on the bridge pier (1);

the jacking unit (4) is arranged on the bottom plate (3) in a removable mode, and the jacking unit (4) is used for temporarily jacking the support (6) to the bottom of the bridge (2);

the support assembly (5) comprises an outer sleeve member (51) and an inner member (52), wherein the outer sleeve member (51) is arranged on the bottom plate (3), the inner member (52) is in threaded connection with the outer sleeve member (51), so that the height of the inner member (52) is adjustable, and the support (6) is permanently propped against the bottom of the bridge (2).

2. The counter-pressure device according to claim 1, characterized in that the bottom plate (3) is a steel plate, the thickness of the bottom plate (3) being not less than 1cm.

3. Back pressure device according to claim 1, characterized in that a plurality of fixing legs (7) are arranged below the base plate (3), which fixing legs (7) are pre-buried in the pier (1).

4. A counter-pressure device according to claim 3, characterized in that the fixing legs (7) are round steel, the diameter of the fixing legs (7) being not less than 2cm and the height not less than 8cm.

5. The counter-pressure device according to claim 1, characterized in that the central area of the bottom plate (3) is provided with a positioning slot, which is adapted to the jacking unit (4); or,

the central area of the bottom plate (3) is provided with an installation identification position.

6. Back pressure device according to claim 1, characterized in that the jacking unit (4) is a thin-walled jack, the jacking unit (4) being externally connected with a hydraulic system.

7. Back pressure device according to claim 6, characterized in that the hydraulic system comprises a hydraulic manual pump (8) and an oil pipe (9), the hydraulic manual pump (8) being connected to the jacking unit (4) via the oil pipe (9).

8. The counter-pressure device according to claim 1, characterized in that the strength grade of the outer jacket element (51) and the inner insert element (52) is 8.8-10.9.

9. The counter-pressure device according to claim 1, characterized in that the outer sleeve member (51) is a nut or a threaded sleeve and the inner member (52) is a bolt or a threaded post.

10. Back pressure device according to claim 1, characterized in that the surfaces of the base plate (3) and the support element (5) are each provided with a corrosion resistant layer.