CN112761081A

CN112761081A - Replacement structure and construction method for active ultra-wide beam body support

Info

Publication number: CN112761081A
Application number: CN202011566839.3A
Authority: CN
Inventors: 张威; 付建国; 张智勇; 余永丰
Original assignee: Hubei Provincial Road & Bridge Co ltd
Current assignee: Hubei Provincial Road & Bridge Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-05-07
Anticipated expiration: 2040-12-25
Also published as: CN112761081B

Abstract

The invention relates to an active service ultra-wide beam body support replacing structure, which comprises: rubber cushion, duplex style of calligraphy jacking crossbeam, jack group, support mesa, interim buttress and the interim basic mound that enlarges, interim expansion basis mound sets up subaerial, interim buttress sets up on interim expansion basis mound, support the mesa setting on interim buttress, jack group sets up on supporting the mesa, duplex style of calligraphy jacking crossbeam upper surface is equipped with rubber cushion, and duplex style of calligraphy jacking crossbeam sets up on jack group. The invention has the beneficial effects that: the pier body is protected from being damaged in construction, the structural integrity is strong, the pier is stable and reliable, a larger construction operation space is provided, and the technical advantage is obvious; a more convenient construction space is reserved for replacing the platform; the arrangement of jacks is reduced, the possibility of deviation in the synchronous jacking process is reduced, the stress of the beam body is more uniform, and the bridge structure is protected from being damaged.

Description

Replacement structure and construction method for active ultra-wide beam body support

Technical Field

The invention relates to the technical field of bridge engineering, in particular to an active ultra-wide beam body support replacing structure and a construction method.

Background

The support is an important structural component for connecting the upper structure and the lower structure of the bridge, is positioned between the bridge and the pad stone, can reliably transfer the load and the deformation born by the upper structure of the bridge to the lower structure of the bridge, and is an important force transfer device of the bridge. With the increase of the service life of the bridge, the support of the existing bridge has the defects of deviation, aging damage and the like, so that potential safety hazards are formed, and the normal use of the bridge is directly influenced. In order to keep the using function of the bridge support normal and maintain the structure safety, the bridge needs to be jacked, and maintenance construction operations such as support replacement, pad stone repair and the like are carried out.

At present, a plurality of jacks and oil pumps are adopted to jack up on an original pier column or a temporary support column, and a support is replaced. However, a lot of problems exist in the process of replacing the bridge support, particularly, when the existing super-wide beam support is replaced, the jack is easy to slide and dislocate during use, the effect of supporting the bridge by the jack is affected, the jacking support adopted by replacing the support is affected by the limitation of the bridge and the field construction environment, and the reliability is difficult to guarantee. Meanwhile, the ultra-wide beam body needs to be jacked to a certain height to treat the support with the disease, and the gap between the bottom of the beam body and the platform cap (or the bridge pier capping beam) is small, so that the problem that the jack at the top of the bridge pier is not enough in arrangement space and the jack and the support are not convenient to place, replace and install is often solved.

Therefore, it is very important to find an active ultra-wide beam support replacing structure and a construction method which have stable structure, strong integrity, large operation space and can be replaced and installed at one time.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a replacement structure and a construction method of an active ultra-wide beam body support.

The replacement structure for the support of the active ultra-wide beam body comprises a pier column protective hoop body arranged on the outer surface of a pier column below the ultra-wide beam body, jacking platforms on two sides of the pier column, and a support replacement platform arranged between the jacking platforms and attached to the pier column protective hoop body;

the jacking platform comprises a rubber cushion layer, a duplex-shaped jacking cross beam, a jack group, a supporting table top, a temporary buttress and a temporary expanded foundation pier, wherein the temporary expanded foundation pier is arranged on the ground, the temporary buttress is arranged on the temporary expanded foundation pier, the supporting table top is arranged on the temporary buttress, the jack group is arranged on the supporting table top, the rubber cushion layer is arranged on the upper surface of the duplex-shaped jacking cross beam, and the duplex-shaped jacking cross beam is arranged on the jack group;

the pier stud protective hoop body is connected with the temporary buttress through a connecting rod and a horizontal fixed hinged support, and the horizontal fixed hinged support is arranged on two sides of the connecting rod;

and the support replacement platform and the pier stud protection hoop body are bolted and fixed through a horizontal foundation bolt which is arranged on the pier stud protection hoop body in advance.

Preferably, the method comprises the following steps: the pier stud protective hoop body is formed by bolting a section steel unit hoop.

Preferably, the method comprises the following steps: the jacking platform is respectively provided with two at pier stud homonymy, and jacking platform's jack group strong point establishes in the edge of a wing below of super wide roof beam body both sides.

The construction method for the replacement structure of the active ultra-wide beam body support comprises the following steps:

1) leveling and hardening the ground around the bottom of the pier stud, bolting a hoop on the outer side of the pier stud to form a pier stud protective hoop body by utilizing the manufactured section steel unit, and bolting or welding horizontal foot bolts, connecting rods and horizontal fixed hinge supports at corresponding positions in advance;

2) reinforcing bars on the ground at two sides of a pier stud, erecting a template, pouring concrete to form a temporary expanded foundation pier pre-embedded with foundation bolts, bolting and installing a temporary buttress on the maintained temporary expanded foundation pier, installing a steel supporting table top at the top of the temporary buttress, connecting the supporting table top with a pier stud protective hoop body into a whole through a connecting rod and a horizontal fixed hinged support, simultaneously erecting a support replacing platform between two jacking platforms at the same side of the pier stud by using a scaffold, and fixedly connecting the horizontal foundation bolts with the pier stud protective hoop body;

3) installing a jack group on the supporting table surface, and then installing a full-length double-square-shaped jacking cross beam with a rubber cushion layer laid on the upper surface on the jack group on the same side of the pier column;

4) uniformly arranging an installation dial indicator as an observation point at the section position of the double-I-shaped jacking cross beam jacked by the jack group, performing final control on the jacking process and the jacking amount, cleaning the top of the pier column, performing test jacking, and performing formal jacking if no problem is observed; after jacking in place, adopting I-shaped steel as a wedge, arranging a temporary support beside the jack group to replace the jack group, adopting an iron hook or manpower to completely take out the old support at one time, and installing a new support; and finally, starting a synchronous jacking system, stably descending the ultra-wide beam body, positioning the beam body, dismantling the support replacing structure after the support is inspected to be qualified, and completing construction of replacing the support of the active ultra-wide beam body.

The invention has the beneficial effects that:

1. compared with the prior art, the jacking platform, the pier column protective hoop body and the support replacing platform arranged in the active ultra-wide beam body support replacing structure form an integrated structure, the pier body is protected from being damaged in construction, meanwhile, the structure is strong in integrity, stable and reliable, larger construction operation space is provided, and the technical advantage is obvious.

2. According to the jacking platform, the jack supporting points are arranged on the flanges on the two sides of the ultra-wide beam body, so that a more convenient construction space is reserved for replacing the platform.

3. The double-I-shaped jacking cross beam with the rubber cushion layer is adopted, so that the arrangement of jacks is reduced, the possibility of deviation in the synchronous jacking process is reduced, the stress of the beam body is more uniform, and the bridge structure is protected from being damaged.

Drawings

FIG. 1 is a schematic diagram of an active ultra-wide beam support replacement structure;

FIG. 2 is a plan view of the pier stud body;

FIG. 3 is a layout view of a jacking platform;

fig. 4 is a schematic plan layout of an active ultra-wide beam body support replacing structure.

Description of reference numerals: 1-ultra-wide beam body; 2-rubber cushion layer; 3-double-I-shaped jacking cross beam; 4-support replacing platform; 5-horizontal foundation bolt; 6-support; 7-jack group; 8-supporting the table top; 9-temporary buttress; 10-connecting rod; 11-temporary enlarged foundation pier; 12-pier column protective hoop body; 13-pier stud; 14-horizontal fixed hinged support; 15-ground.

Detailed Description

The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Example one

The structure is changed to super wide beam body support in active service, including setting up in the jacking platform of pier stud protection hoop body 12 and pier stud 13 both sides of the 13 surface of pier stud of super wide beam body 1 below to and set up between the jacking platform and depend on the support of pier stud protection hoop body 12 and change platform 4. The support 6 is positioned between the ultra-wide beam body 1 and the pier stud 13.

Jacking platform include rubber cushion 2, duplex style of calligraphy jacking crossbeam 3, jack group 7, support mesa 8, interim buttress 9 and enlarge basic mound 11 temporarily, enlarge basic mound 11 temporarily and set up on ground 15, interim buttress 9 sets up on enlarging basic mound 11 temporarily, support mesa 8 sets up on interim buttress 9, jack group 7 sets up on supporting

mesa

8, 3 upper surfaces of duplex style of calligraphy jacking crossbeam are equipped with rubber cushion 2, and duplex style of calligraphy jacking crossbeam 3 sets up on jack group 7. The pier stud protective hoop body 12 is connected with the temporary buttress 9 through a connecting rod 10 and a horizontal fixed hinged support 14, and the horizontal fixed hinged support 14 is arranged on two sides of the connecting rod 10 and used for reinforcing a stable jacking platform. Between platform 4 and pier stud protection hoop body 12 is changed to the support, it is fixed to bolt through the horizontal rag bolt 5 of setting in advance on pier stud protection hoop body 12.

The pier stud protective hoop body 12 is formed by bolting a section steel unit hoop.

The jacking platform respectively be equipped with two at pier stud 13 homonymy, and jacking platform's jack group 7 strong point establishes in the edge of a wing below of super wide body 1 both sides.

Example two

The construction method of the replacement structure of the active ultra-wide beam body support comprises the following steps:

1) as shown in fig. 2, the ground 15 around the bottom of the pier stud 13 is leveled and hardened, the outer side of the pier stud 13 is bolted with a hoop using the fabricated section steel unit to form a pier stud protective hoop body 12, and the horizontal foot bolt 5, the connecting rod 10 and the horizontal fixed hinge support 14 are bolted or welded in advance at the corresponding positions.

2) As shown in fig. 3 and 4, the ground 15 on both sides of the pier stud 13 is reinforced and provided with a template, the concrete is poured to form a temporary enlarged foundation pier 11 embedded with anchor bolts, a temporary buttress 9 is bolted and installed on the maintained temporary enlarged foundation pier 11, a steel supporting table 8 is installed at the top of the temporary buttress 9, the supporting table 8 is connected with the pier stud protective hoop body 12 into a whole through a connecting rod 10 and a horizontal fixed hinged support 14, and meanwhile, a support replacing platform 4 is arranged between two jacking platforms on the same side of the pier stud 13 by using a scaffold, and the horizontal anchor bolts 5 are fixedly connected with the pier stud protective hoop body 12.

3) As shown in fig. 1 and 4, a jack group 7 is installed on a supporting table surface 8, the flatness of the jack placement is guaranteed, then a full-length double-I-shaped jacking cross beam 3 with a rubber cushion layer 2 laid on the upper surface is installed on the jack group 7 on the same side of a pier column 13, and meanwhile, the full-surface contact stress of the jack group 7 is guaranteed.

4) The cross-section position equipartition of jacking two style of calligraphy jacking crossbeams 3 at jack group 7 jack-up establishes an installation percentage table as the observation point for carry out the final control of jacking process and jacking volume, clearance pier stud 13 top again guarantees that the support changes the operation face clean and tidy, then tries on the top, if observe not have the problem, carries out formal jacking. After jacking in place, I-shaped steel is used as a wedge, a temporary support is arranged beside the jack group to replace the jack group 7, an iron hook or a worker is used for taking out the old support at one time, and a new support is installed. And finally, starting a synchronous jacking system, stably descending the ultra-wide beam body 1, positioning the beam body, dismantling the support replacing structure after the support is inspected to be qualified, and completing construction of replacing the support of the active ultra-wide beam body.

Claims

1. The utility model provides a structure is changed to super wide roof beam body support in active service which characterized in that: the device comprises pier column protective hoop bodies (12) arranged on the outer surfaces of pier columns (13) below an ultra-wide beam body (1), jacking platforms on two sides of the pier columns (13), and support replacing platforms (4) arranged between the jacking platforms and attached to the pier column protective hoop bodies (12);

the jacking platform comprises a rubber cushion layer (2), a double-I-shaped jacking cross beam (3), a jack group (7), a supporting table top (8), a temporary buttress (9) and a temporary enlarged foundation pier (11), wherein the temporary enlarged foundation pier (11) is arranged on the ground (15), the temporary buttress (9) is arranged on the temporary enlarged foundation pier (11), the supporting table top (8) is arranged on the temporary buttress (9), the jack group (7) is arranged on the supporting table top (8), the rubber cushion layer (2) is arranged on the upper surface of the double-I-shaped jacking cross beam (3), and the double-I-shaped jacking cross beam (3) is arranged on the jack group (7);

the pier stud protective hoop body (12) is connected with the temporary buttress (9) through a connecting rod (10) and a horizontal fixed hinged support (14), and the horizontal fixed hinged support (14) is arranged on two sides of the connecting rod (10);

between platform (4) and pier stud guard hoop body (12) is changed to the support, it is fixed to carry out the bolt through setting up horizontal rag bolt (5) on pier stud guard hoop body (12) in advance.

2. The active ultra-wide beam body support replacement structure as claimed in claim 1, wherein: the pier stud protective hoop body (12) is formed by bolting a section steel unit hoop.

3. The active ultra-wide beam body support replacement structure as claimed in claim 1, wherein: the jacking platform is respectively provided with two jacks at the same side of the pier stud (13), and the supporting points of the jack group (7) of the jacking platform are arranged below the flanges at the two sides of the ultra-wide beam body (1).

4. The construction method for the replacement structure of the active ultra-wide beam body support based on the claim 1 is characterized by comprising the following steps:

1) leveling and hardening the ground (15) at the periphery of the bottom of the pier stud (13), bolting hoop rings on the outer side of the pier stud (13) by utilizing the manufactured section steel unit to form a pier stud protective hoop body (12), and bolting or welding horizontal foot bolts (5), connecting rods (10) and horizontal fixed hinged supports (14) at corresponding positions in advance;

2) reinforcing steel bars are arranged on the ground (15) on the two sides of a pier stud (13) and a template is erected, concrete is poured to form a temporary expanded foundation pier (11) embedded with foundation bolts, a temporary buttress (9) is installed on the maintained temporary expanded foundation pier (11) in a bolted mode, a steel supporting table top (8) is installed at the top of the temporary buttress (9), then the supporting table top (8) is connected with a pier stud protective hoop body (12) into a whole through a connecting rod (10) and a horizontal fixed hinged support (14), meanwhile, a support replacing platform (4) is erected between two jacking platforms on the same side of the pier stud (13) through a scaffold, and the horizontal foundation bolts (5) are fixedly connected with the pier stud protective hoop body (12);

3) a jack group (7) is installed on the supporting table top (8), and then a full-length double-I-shaped jacking cross beam (3) with a rubber cushion layer (2) laid on the upper surface is installed on the jack group (7) on the same side of the pier column (13);

4) arranging an installation dial indicator as an observation point at each section position of the double-I-shaped jacking cross beam (3) jacked by the jack group (7), performing final control on the jacking process and the jacking amount, cleaning the top of the pier column (13), performing test jacking, and performing formal jacking if no problem exists in observation; after jacking in place, I-shaped steel is used as a wedge, a temporary support is arranged beside the jack group to replace the jack group (7), an iron hook or a worker is used for taking out the old support at one time, and a new support is installed; and finally, starting a synchronous jacking system, stably descending the ultra-wide beam body (1), positioning the beam body, dismantling the support replacing structure after the support is inspected to be qualified, and completing construction of replacing the support of the active ultra-wide beam body.