CN112411358B - Concrete protective layer control positioning device at pier joint and construction process - Google Patents
Concrete protective layer control positioning device at pier joint and construction process Download PDFInfo
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- CN112411358B CN112411358B CN202011363327.7A CN202011363327A CN112411358B CN 112411358 B CN112411358 B CN 112411358B CN 202011363327 A CN202011363327 A CN 202011363327A CN 112411358 B CN112411358 B CN 112411358B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/168—Spacers connecting parts for reinforcements and spacing the reinforcements from the form
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/18—Spacers of metal or substantially of metal
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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a concrete protective layer control positioning device at a pier connection part and a construction process thereof, wherein the device comprises a positioning bracket, a reference steel plate and a positioning steel plate, wherein the positioning bracket is arranged on a bearing platform and positioned in pier body steel bars; the reference steel plate is arranged around the positioning bracket, and the outer end of the reference steel plate is positioned at the outer side of the positioning bracket; the inboard of location steel sheet passes through detachable construction with the outer end of benchmark steel sheet and links to each other, is equipped with the location structure who is used for fixing a position pier shaft reinforcing bar on the outside of location steel sheet. The line shape of the steel bar can be accurately controlled, the thickness of the concrete protective layer can meet the design requirement, the quality of the concrete protective layer at the abutment joint can be ensured, and the construction time can be shortened; and the quick turnover of the positioning device can be effectively realized, the limitation that the conventional stiff framework cannot be turned over is overcome, the cost is reduced, and the device has wide usability for controlling the thickness of the protective layer at the pier joint.
Description
Technical Field
The invention relates to the technical field of bridges, in particular to a quickly detachable pier connection concrete protective layer control positioning device and a construction process.
Background
Along with the development of economy in China, more and more projects pay attention to the improvement of the whole life cycle and the durability as a guide, a concrete protective layer is used as an important index of the durability of a reinforced concrete structure according to the latest specification, namely the civil engineering project of the first volume of the highway engineering quality inspection and evaluation standard (JTG F80/1-2017), and the concrete protective layer is used as a key item in the quality acceptance process, and the quality qualification rate is required to be not lower than 95%.
The joint of the bridge cast-in-place concrete abutment and the pier body is used as an initial section of pier body construction, the structural stress of the section is complex, and whether the positioning accuracy of the section of steel bar is directly related to the qualified degree of the thickness of a protective layer of the whole pier body, so that the positioning accuracy degree of the steel bar at the joint of the bridge abutment and the pier body is especially important for the structural durability.
For cast-in-place concrete with a pier body with a pier height of more than 30m, the traditional process is to arrange a stiff framework, and the displacement of main ribs is restrained by the rigidity of the stiff framework, so that the thickness of a protective layer is controlled. However, the stiff skeleton cannot be removed and can only be poured into the pier body as a construction auxiliary measure, so that the construction cost is increased, and for projects with more bridge approach pier bodies, the cost investment of the measure cost is large and uneconomical.
At present, China is in the peak period of bridge infrastructure construction, and for the reasons, if all stiff frameworks are adopted, the investment of measure cost is huge. In order to save cost, relevant specifications stipulate that the thickness of the concrete protective layer can be controlled by directly lofting and positioning the position of a main rib on a bearing platform and controlling the distance between a concrete protective layer cushion block and a template without arranging a stiff framework for cast-in-place concrete of a pier body with the pier height not more than 30 m; however, the structural stress at the joint of the abutment and the pier body is complex, so that the steel bars are easy to deform, and the requirement on quality control of the concrete protective layer cannot be met without a rigid framework.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the technical problem of providing a concrete protective layer control positioning device at the pier connection part and a construction process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a concrete protection layer control positioning device at an abutment joint comprises:
the positioning bracket is arranged on the bearing platform and positioned inside the pier body steel bar;
the datum steel plate is arranged on the periphery of the positioning bracket, and the outer end of the datum steel plate is positioned on the outer side of the positioning bracket;
the inboard of location steel sheet passes through detachable construction with the outer end of benchmark steel sheet and links to each other, is equipped with the location structure who is used for fixing a position the pier shaft reinforcing bar on the outside of location steel sheet.
The positioning support is of a square frame structure and comprises four vertical columns and a support horizontal support arranged between the adjacent columns, and the inner end of the reference steel plate is arranged on the support horizontal support.
The positioning steel plate is a bar-shaped steel plate horizontally arranged, and the positioning structure is a group of steel bar positioning grooves arranged on the outer side of the bar-shaped steel plate side by side.
The outer end of the reference steel plate is provided with a positioning hole, the inner side of the positioning steel plate is provided with a connecting hole corresponding to the positioning hole, and the connecting hole penetrates through the connecting hole through a connecting bolt to be connected with the positioning hole.
The support horizontal brace that sets up between the adjacent stand is a set of that sets up side by side from top to bottom, and every support horizontal brace is improved level and is set up a set of benchmark steel sheet side by side.
And the support horizontal supports on the adjacent sides of the frame structure are arranged in a staggered manner in the vertical direction.
And a support diagonal brace is arranged between the opposite corner upright posts in the square frame structure.
The reinforcing bar positioning groove is an arc-shaped groove, and the opening size of the arc-shaped groove is larger than the diameter size of a main bar of the pier shaft reinforcing bar.
The positioning hole at the outer end of the reference steel plate is a waist-shaped hole.
A control positioning construction process for a concrete protection layer at a pier joint comprises the following steps:
pouring a bearing platform, leveling the surface, taking out a positioning point of a positioning device through measuring accurate lofting, hoisting the positioning device to a lofting position through a crane, installing a positioning steel plate on a reference steel plate, retesting and finely adjusting the positioning steel plate, welding and binding pier body steel bars, installing a concrete protective layer cushion block, removing the positioning steel plate, hoisting the positioning device away from the bearing platform, completing template installation of pier body concrete pouring, pouring concrete at a pier connection part, and removing a template after concrete curing is completed and the design strength is reached.
Compared with the prior art, the invention has the following advantages:
the control positioning device for the concrete protection layer at the abutment joint and the construction process are reasonable in design, not only can the line shape of the reinforcing steel bar be accurately controlled, the thickness of the concrete protection layer is ensured to meet the design requirement, the quality of the concrete protection layer at the abutment joint is ensured, and the construction time is shortened; and the quick turnover of the positioning device can be effectively realized, the limitation that the conventional stiff framework cannot be turned over is overcome, the cost is reduced, and the device has wide usability for controlling the thickness of the protective layer at the pier joint.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic view of the positioning device of the present invention placed on a platform.
FIG. 2 is a schematic view of a positioning device according to the present invention.
FIG. 3 is an enlarged view of the joint between the reference steel plate and the positioning steel plate according to the present invention.
FIG. 4 is a partial schematic view of a positioning plate according to the present invention.
Fig. 5 is a diagram illustrating the effect of the reinforcement construction of the pier body at the pier connection position according to the present invention.
FIG. 6 is a schematic diagram of the positioning device of the present invention being lifted away.
Fig. 7 is a diagram showing the effect of the completion of the construction of the pier body formwork at the pier connection position of the present invention.
In the figure:
1. the steel bar support comprises a bearing platform, 2 parts of a positioning device, 201 parts of a support upright post, 202 parts of a support horizontal support, 203 parts of a support inclined support, 204 parts of a reference steel plate, 205 parts of a positioning steel plate, 2051 parts of a connecting hole, 2052 parts of a steel bar positioning groove and 206 parts of a connecting bolt.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
As shown in fig. 1 to 7, the quickly detachable concrete protective layer control positioning device 2 at the abutment joint comprises a positioning bracket, a reference steel plate 204 and a positioning steel plate 205, wherein the positioning bracket is arranged on the bearing platform 1 and positioned inside the pier body steel bar; the reference steel plate 204 is arranged around the positioning bracket, and the outer end of the reference steel plate is positioned at the outer side of the positioning bracket; the inboard of location steel sheet passes through detachable construction with the outer end of benchmark steel sheet and links to each other, is equipped with the location structure who is used for fixing a position pier shaft reinforcing bar on the outside of location steel sheet 205.
The positioning bracket is of a square frame structure and comprises four bracket upright columns 201 which are vertically arranged and a bracket horizontal support 202 arranged between adjacent upright columns, and the inner end of a reference steel plate 204 is arranged on the bracket horizontal support; the positioning steel plate is the bar steel plate that the level set up, and location structure is for establishing a set of reinforcing bar positioning groove 2052 in the bar steel plate outside side by side, fixes a position the pier shaft reinforcing bar through positioning groove.
The horizontal supports of the supports arranged between the adjacent upright posts are a group arranged side by side up and down, and a group of reference steel plates are horizontally arranged on each horizontal support side by side; the support level on the adjacent side of frame construction props at vertical direction dislocation set, and pier shaft reinforcing bar location is reliable.
And a support diagonal brace 203 is arranged between the opposite corner upright posts in the square frame structure, so that the structural strength is high. The outer end of the reference steel plate is provided with a positioning hole, the inner side of the positioning steel plate 205 is provided with a connecting hole 2051 corresponding to the positioning hole, the connecting hole is penetrated through by a connecting bolt 206 and is connected with the positioning hole, and the positioning hole at the outer end of the reference steel plate is a kidney-shaped hole; the positioning steel plate is simple and convenient to mount and dismount, and the position of the positioning steel plate is finely adjusted within a certain range according to the actual construction condition.
The steel bar positioning groove 2052 is an arc-shaped groove, and the opening size of the arc-shaped groove is larger than the diameter size of the main bar of the pier shaft steel bar.
The control positioning construction process of the concrete protective layer at the abutment joint comprises the following steps:
pouring a bearing platform, leveling the surface, taking out a positioning point of a positioning device through measuring accurate lofting, hoisting the positioning device to a lofting position through a crane, installing a positioning steel plate on a reference steel plate, retesting and finely adjusting the positioning steel plate, welding and binding pier body steel bars, installing a concrete protective layer cushion block, removing the positioning steel plate, hoisting the positioning device away from the bearing platform, completing template installation of pier body concrete pouring, pouring concrete at a pier connection part, and removing a template after concrete curing is completed and the design strength is reached.
The invention can not only accurately control the line shape of the steel bar, ensure that the thickness of the concrete protective layer meets the design requirement, ensure the quality of the concrete protective layer at the abutment joint, and shorten the construction time; and the quick turnover of the positioning device can be effectively realized, the limitation that the conventional stiff framework cannot be turned over is overcome, the cost is reduced, and the device has wide usability for controlling the thickness of the protective layer at the pier joint.
Preferred specific examples are:
the positioning device comprises a positioning bracket arranged in the pier body steel bar, a positioning steel plate and a connecting bolt, wherein the positioning steel plate is arranged in the bracket and can be quickly detached from the steel bar; the positioning support is composed of an upright post, a horizontal joint, an inclined strut and a reference steel plate, the height of the support is 1.5m, the upright post, the horizontal joint and the inclined strut are welded and connected by I-shaped steel I14, the reference steel plate is a steel plate with the thickness of 10mm, and the reference steel plate is provided with bolt holes.
The positioning steel plate is a steel plate with the thickness of 10mm, the end of the positioning steel plate is provided with a positioning dent of the main rib, the dent is slightly larger than the diameter of the main rib, and the position of the main rib thread is avoided during the blanking of the main rib so as to avoid influencing the positioning precision.
A high-strength bolt is arranged between the reference steel plate and the positioning steel plate, and the reference steel plate and the positioning steel plate are connected into a whole through the pretightening force of the high-strength bolt, so that the steel plate is prevented from displacement and deformation when the main rib is erected.
The construction process of the structure:
should make level the cushion cap surface before the support mounting, through measuring the setpoint that accurate lofting goes out the support base, the support passes through crane hoist and mount to the position of lofting, installation location steel sheet to the benchmark steel sheet on to just twist through high strength bolt and tentatively fix, through carrying out retest and finely tune the plane position of locating plate again with high strength bolt one by one again and twist finally, accomplish positioner's installation.
And (4) installing, welding and binding the main reinforcement and the stirrup at the connection position of the abutment by the aid of the positioning device.
After the main pier body reinforcement and the stirrup are constructed to form a whole and a concrete protective layer cushion block is installed, the high-strength bolts between the positioning steel plates and the reference steel plates are gradually loosened, so that the positioning steel plates are gradually unloaded, the support is separated from the main reinforcement, and finally the support is lifted away from the bearing platform through a crane.
And finishing the template installation of pouring the pier body concrete.
And pouring concrete at the pier joint, removing the template after the concrete is cured and reaches the design strength, and completing the construction of the pier body segment at the pier joint.
The positioning device forms a rigid framework through the bracket, so that the integral deviation and deformation are avoided in the process of installing the steel bars at the abutment joint; the reference steel plate welded on the bracket is connected with the positioning steel plate through the high-strength bolt, so that the accurate positioning and the quick disassembly of the positioning device are effectively realized; the integral rigidity of the structure is high, the dead weight is light, and the positioning device can be quickly recycled; the implementation process has strong operability, does not increase equipment investment, does not influence the construction period, and reduces the cost.
The above-mentioned features are merely for describing preferred embodiments of the present invention and may be arbitrarily combined to form a plurality of embodiments of the present invention.
The invention is described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the above embodiments, and it is within the scope of the invention to use the concept and technical solution of the invention in other fields without substantial or direct modification.
Claims (7)
1. The utility model provides a pier connection department concrete protection layer control positioner which characterized in that: the method comprises the following steps:
the positioning bracket is arranged on the bearing platform and positioned inside the pier body steel bar;
the datum steel plate is arranged on the periphery of the positioning bracket, and the outer end of the datum steel plate is positioned on the outer side of the positioning bracket;
the inner side of the positioning steel plate is connected with the outer end of the reference steel plate through a detachable structure, and the outer side of the positioning steel plate is provided with a positioning structure for positioning pier body steel bars;
the positioning support is of a square frame structure and comprises four upright columns which are vertically arranged and a support horizontal support which is arranged between the adjacent upright columns, and the inner end of the reference steel plate is arranged on the support horizontal support;
the positioning steel plate is a horizontally arranged strip-shaped steel plate, and the positioning structure is a group of steel bar positioning grooves which are arranged on the outer side of the strip-shaped steel plate side by side; the outer end of the reference steel plate is provided with a positioning hole, the inner side of the positioning steel plate is provided with a connecting hole corresponding to the positioning hole, and the connecting hole penetrates through the connecting hole through a connecting bolt to be connected with the positioning hole.
2. The concrete protective layer control positioning device at the abutment joint according to claim 1, wherein: the support horizontal brace that sets up between the adjacent stand is a set of that sets up side by side from top to bottom, and every support horizontal brace is improved level and is set up a set of benchmark steel sheet side by side.
3. The concrete protective layer control positioning device at the abutment joint according to claim 1, wherein: and the support horizontal supports on the adjacent sides of the frame structure are arranged in a staggered manner in the vertical direction.
4. The concrete protective layer control positioning device at the abutment joint according to claim 1, wherein: and a support diagonal brace is arranged between the opposite corner upright posts in the square frame structure.
5. The concrete protective layer control positioning device at the abutment joint according to claim 1, wherein: the reinforcing bar positioning groove is an arc-shaped groove, and the opening size of the arc-shaped groove is larger than the diameter size of the main bar of the pier shaft reinforcing bar.
6. The concrete protective layer control positioning device at the abutment joint according to claim 1, wherein: the positioning hole at the outer end of the reference steel plate is a waist-shaped hole.
7. A construction process for controlling and positioning a device by utilizing the concrete protective layer at the abutment joint of any one of claims 1 to 6, which is characterized in that: the construction process comprises the following steps:
pouring a bearing platform, leveling the surface, taking out a positioning point of a positioning device through measuring accurate lofting, hoisting the positioning device to a lofting position through a crane, installing a positioning steel plate on a reference steel plate, retesting and finely adjusting the positioning steel plate, welding and binding pier body steel bars, installing a concrete protective layer cushion block, removing the positioning steel plate, hoisting the positioning device away from the bearing platform, completing template installation of pier body concrete pouring, pouring concrete at a pier connection part, and removing a template after concrete curing is completed and the design strength is reached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011363327.7A CN112411358B (en) | 2020-11-27 | 2020-11-27 | Concrete protective layer control positioning device at pier joint and construction process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011363327.7A CN112411358B (en) | 2020-11-27 | 2020-11-27 | Concrete protective layer control positioning device at pier joint and construction process |
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| CN112411358A CN112411358A (en) | 2021-02-26 |
| CN112411358B true CN112411358B (en) | 2022-07-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114108492A (en) * | 2021-12-21 | 2022-03-01 | 浙江交工集团股份有限公司 | Assembled framework for temporarily positioning cast-in-place stand column reinforcement cage and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201377141Y (en) * | 2009-02-20 | 2010-01-06 | 铁法煤业集团建设工程有限责任公司 | Reinforcing steel bar positioning clamp of reinforced concrete column |
| CN203420229U (en) * | 2013-09-05 | 2014-02-05 | 中铁上海工程局有限公司 | Positioner for reinforcement framework of round-ended solid pier body |
| NL2012852B1 (en) * | 2014-05-21 | 2016-03-07 | G Taekema Holding B V | A method of manufacturing a reinforced concrete floor on a base. |
| CN206256368U (en) * | 2016-12-12 | 2017-06-16 | 中铁上海工程局集团第五工程有限公司 | A kind of pier shaft bar spacer disk |
| CN109736205A (en) * | 2019-01-25 | 2019-05-10 | 云南省铁路总公司 | Protective layer thickness control method in pier stud work progress |
| CN110565518A (en) * | 2019-08-01 | 2019-12-13 | 中交二公局第二工程有限公司 | assembled stiff skeleton suitable for pier tower steel bar positioning and use method thereof |
| CN211596361U (en) * | 2019-12-17 | 2020-09-29 | 中铁七局集团第五工程有限公司 | Accurate positioner for pier body pad stone preformed hole |
| CN111455837B (en) * | 2020-05-06 | 2022-03-25 | 中国建筑土木建设有限公司 | Thin-wall hollow pier pouring connection structure and construction method thereof |
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