CN114892530B - Arc body combined formwork supporting structure of ultrahigh double-layer arc tie beam and construction method - Google Patents

Arc body combined formwork supporting structure of ultrahigh double-layer arc tie beam and construction method Download PDF

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Publication number
CN114892530B
CN114892530B CN202210565841.1A CN202210565841A CN114892530B CN 114892530 B CN114892530 B CN 114892530B CN 202210565841 A CN202210565841 A CN 202210565841A CN 114892530 B CN114892530 B CN 114892530B
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tie beam
template
arc
arc body
concrete
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CN114892530A (en
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程玉涛
陈吉光
张誉镪
包希吉
郭洪彬
宋浩
史锦辉
王相伟
赵秀涛
王允帅
王龙
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Second Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd
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Second Construction Co Ltd of China Construction Eighth Engineering Division Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/02Piers; Abutments ; Protecting same against drifting ice
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/20Hydro energy

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The invention belongs to the technical field of double-layer arc-shaped tie beam construction, and particularly relates to an arc-shaped body combined formwork support structure of an ultrahigh double-layer arc-shaped tie beam and a construction method. The method comprises the steps of measuring and paying-off; the lower pier stud scaffold and the first tie beam side template are supported, and the first tie beam arc-shaped body bottom template is supported; binding first tie beam steel bars; the first tie beam arc body top template is supported; pouring and curing the concrete of the lower pier stud and the first tie beam; the upper pier stud scaffold and the second tie beam side template are supported, and the second tie beam arc bottom template is supported; binding second tie beam steel bars; the second tie beam arc body top template is supported; and (5) pouring concrete on the upper pier stud and the second tie beam, removing the mould and curing. The arrangement of the arc body bottom template and the arc body support backing plate effectively reduces the potential safety hazard caused by unstable support of the arc beam-tying template scaffold, and the arrangement of the vibration opening of the arc body top template effectively reduces the potential structural hazard caused by insufficient vibration of beam-tying concrete.

Description

Arc body combined formwork supporting structure of ultrahigh double-layer arc tie beam and construction method
Technical Field
The invention belongs to the technical field of double-layer arc-shaped tie beam construction, and particularly relates to an arc-shaped body combined formwork support structure of an ultrahigh double-layer arc-shaped tie beam and a construction method.
Background
In the prior traditional bridge engineering construction, in order to meet the field requirement, the tie beams of partial pier columns are characterized by large height difference and large section size, and some tie beams are designed into arc shapes for pursuing attractive appearance and better stress performance. The large tie beam height difference and the large section size bring a certain technical problem for supporting the project frame body. In addition, the tie beam presents an arc shape, when the second tie beam frame body is supported, the bottom support is arranged on the arc-shaped surface of the first tie beam, so that the partial frame body is easily supported unstably, and a large potential safety hazard is brought to engineering. And after the pier column template and the tie beam template are erected, when concrete is poured, the tie beam template is in a fully-closed state, so that the tie beam concrete cannot be vibrated in place, and the engineering structure safety cannot be ensured.
With the new technical innovation and development of foundation facilities such as bridges in China, research and deepening of pier stud tie beam steel templates according to the use requirements are urgently needed, and a set of arc-shaped body combined template supporting structure and a construction method which are safe and reliable and capable of greatly improving the tie beam construction quality are achieved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the arc body combined formwork support structure of the ultra-high double-layer arc-shaped tie beam and the construction method, which can effectively solve the problems of unstable tie beam support frame and insufficient tie beam concrete pouring, improve the construction progress and quality and save the construction cost.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the construction method of the arc body combined template supporting structure of the ultra-high double-layer arc tie beam comprises the following steps,
(1) Measuring and paying off;
(2) The lower pier stud scaffold and the first tie beam side template are supported, and the first tie beam arc-shaped body bottom template is supported;
(3) Binding first tie beam steel bars;
(4) The first tie beam arc body top template is supported;
(5) Pouring and curing the concrete of the lower pier stud and the first tie beam;
(6) The upper pier stud scaffold and the second tie beam side template are supported, and the second tie beam arc bottom template is supported;
(7) Binding second tie beam steel bars;
(8) The second tie beam arc body top template is supported;
(9) And (5) pouring concrete on the upper pier stud and the second tie beam, removing the mould and curing.
Solves the problems of the preferred solution of the present invention,
the specific steps of the step (1) comprise,
according to the coordinates of the center and the axis control points of the pier, accurately measuring and discharging the center elevation, the central axis and the peripheral side lines of the pier from the top surface of the bearing platform, ejecting the longitudinal and transverse axes of the corresponding upright post by using ink lines, and reserving corresponding leads for positioning when the upright template is used; after rechecking, carrying out the next procedure; after the template is erected to the pier top, the position and the axis control point of the pier top cap are accurately measured and released from the wire point, the pier top standard height and the rechecking of the positions of the pre-buried holes and pieces are finished.
Solves the problems of the preferred solution of the present invention,
the concrete steps of the step (2) and the upper pier column scaffold and the lower pier column scaffold of the step (6) and the second tie beam side template mounting mode comprise,
the method comprises the steps of mechanically polishing slurry on the surface before the first tie beam side template is installed, brushing salad oil release agent, and then assembling the first tie beam side template and an arc-shaped body bottom template, wherein the arc-shaped body bottom template is supported by vertical channel steel, is supported by horizontal channel steel and consists of an arc-shaped steel template, and consists of double-sided 6mm steel plates and 10# groove steel ring ribs; the vertical channel steel support and the horizontal channel steel support are 10# channel steel support which are arranged at intervals of 235 mm; the bottom of the vertical channel steel support is fixedly connected with the horizontal channel steel support by adopting a M20 bolt for 10# channel steel, and the common tie beam steel template is optimized into an arc-shaped body combined template with a flat bottom.
Solves the problems of the preferred solution of the present invention,
the specific steps of the step (3) and the step (7) comprise,
and processing the steel bars into the required size and radian of the drawing by using a positioning steel bar processing model, and binding tie bars.
Solves the problems of the preferred solution of the present invention,
the specific steps of the step (4) and the step (8) comprise,
the upper portion of the tie beam arc body top template is provided with two switchable concrete vibrating openings, a vibrating opening cover plate is closed after concrete vibrating is completed, the vibrating opening material is the same as that of the tie beam steel template, the edge of the vibrating opening cover plate is provided with a flange, M20 bolt holes are reserved, the cover plate is connected through M20 connecting bolts and is fixed on the tie beam steel template, the tie beam steel template is covered with the vibrating opening cover plate after concrete pouring is performed to the level of the vibrating opening, the M20 bolts and the steel template are used for connecting and fixing, and then the concrete pouring of the rest of the upper portion is performed.
Solves the problems of the preferred solution of the present invention,
the specific steps of the step (5) and the step (9) comprise,
after the pier column template is erected, before concrete is poured, gaps between the bottom of the template and a foundation are plugged by using mortar in advance, so that leakage of the mortar is prevented;
setting a string cylinder before concrete pouring, wherein the pouring height of each layer of concrete is 30-40 cm, a phi 50 plug-in vibrating rod is adopted for concrete tamping, and when in vibrating, a vibrator is vertically inserted, quickly and slowly out, and the depth of the vibrator inserted into the lower layer of concrete is 5-10cm, and the moving interval is not more than 1.5 times of the action radius of the vibrator, namely 45-60 cm;
when the first tie beam concrete is poured, two switchable concrete vibrating ports are formed in the upper portion of the tie beam template, flanges are arranged at the edges of the cover plates of the vibrating ports, M20 bolt holes are reserved, and after concrete vibrating is completed, the tie beam template is connected through M20 connecting bolts and fixed on the tie beam steel template; and (3) after concrete pouring and vibrating are completed, installing a vibrating port cover plate, and then pouring concrete on the pier column at the upper part of the tie beam, wherein the pouring height is 1m higher than the top elevation of the tie beam.
In a preferred embodiment of the present invention, the step (5) further includes,
when the strength of the concrete is more than or equal to 10MPa, chiseling the floating slurry on the top of the bearing platform on the concrete poured on the surface, washing the surface of the concrete after roughening treatment by using pressurized water, keeping the surface moist but not accumulating water, paving a layer of cement slurry or cement slurry with the same components as the concrete, and when the strength of the lower tie beam concrete reaches 75% of the design strength, building the upper tie beam support frame.
Solves the problems of the preferred solution of the present invention,
the specific steps of the step (6) comprise,
before the second tie beam supporting frame body is supported, an arc body combined supporting structure backing plate is placed at the top of the first tie beam, the arc body combined supporting structure backing plate is supported by vertical channel steel, the horizontal channel steel support and an arc steel template are formed, and the arc steel template is formed by double-side 6mm steel plates and 10# groove steel annular ribs; the vertical channel steel support and the horizontal channel steel support are 10# channel steel support which are arranged at intervals of 235 mm; the bottom of the vertical channel steel support is fixedly connected with the horizontal channel steel support by adopting a 10# channel steel through an M20 bolt, and the upper tie beam frame body is supported on the horizontal channel steel.
The support structure of the arc body combined template of the ultra-high double-layer arc-shaped tie beam comprises a first tie beam arc body support structure and a second tie beam arc body support structure, wherein the first tie beam arc body support structure is arranged at the upper end of the second tie beam arc body support structure;
the first tie beam arc body supporting structure comprises a lower pier column scaffold, a first tie beam arc body bottom template arranged at the upper end of the lower pier column scaffold, a first tie beam arc body top template arranged above the first tie beam arc body bottom template, two concrete vibrating ports arranged at the upper end of the first tie beam arc body top template, and first tie beam side templates arranged at two sides of the lower pier column scaffold and the first tie beam arc body bottom template;
the second tie beam arc body supporting structure comprises an arc body combined supporting structure base plate arranged at the top of the first tie beam, an upper pier column scaffold arranged on the arc body combined supporting structure base plate, a second tie beam arc body bottom template arranged at the upper end of the upper pier column scaffold, and second tie beam side templates arranged at two sides of the upper pier column scaffold and the second tie beam arc body bottom template and above the first tie beam side templates.
The invention solves the preferable scheme, the first tie beam arc body bottom template, the arc body combined supporting structure backing plate and the second tie beam arc body bottom template are supported by vertical channel steel, horizontal channel steel support and arc steel template, the arc steel template is composed of double-side 6mm steel plates and 10# groove steel ring ribs; the vertical channel steel support and the horizontal channel steel support are 10# channel steel support which are arranged at intervals of 235 mm; the bottom of the vertical channel steel support is fixedly connected with the horizontal channel steel support by adopting a M20 bolt for 10# channel steel.
The arc body combined formwork support structure of the ultra-high double-layer arc tie beam and the construction method thereof have the advantages that: the arrangement of the arc body bottom template and the arc body support backing plate effectively reduces the potential safety hazard caused by unstable support of the arc beam-tying template scaffold, and the arrangement of the vibration opening of the arc body top template effectively reduces the potential structural hazard caused by insufficient vibration of beam-tying concrete.
Drawings
FIG. 1 is a schematic view of a connection structure of a first tie beam arc support structure according to an embodiment of the present invention;
FIG. 2 is a schematic view of a connection structure of a second tie beam arc support structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a front view of a bottom formwork of an arc body and a pad of an arc body combined support structure according to an embodiment of the present invention;
FIG. 4 is a schematic perspective view of a bottom formwork of an arc body and a support structure backing plate of an arc body assembly according to an embodiment of the present invention;
FIG. 5 is a schematic top view of an arc body top template according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a front view of an arc-shaped body top template according to an embodiment of the present invention;
FIG. 7 is a schematic perspective view of an arc-shaped body top template according to an embodiment of the present invention;
description of the component reference numerals:
a first tie beam 100, a second tie beam 200, a lower pier stud 300, an upper pier stud 400, a lower pier stud scaffold 1, a first tie beam arc body bottom template 2, a first tie beam arc body top template 3, a concrete vibrating port 4, a first tie beam side template 5, an arc body combined support structure backing plate 6, an upper pier stud scaffold 7, a second tie beam arc body bottom template 8, a second tie beam side template 9,
the steel plate comprises a vertical channel steel support 10, a horizontal channel steel support 11, an arc steel template 12, double-sided steel plates 13 and channel steel annular ribs 14.
Detailed Description
The following description of the embodiments is provided in conjunction with the accompanying drawings.
Examples:
as shown in fig. 1-7, the arc body combined formwork support structure of the ultra-high double-layer arc-shaped tie beam comprises a first tie beam arc body support structure and a second tie beam arc body support structure, wherein the first tie beam arc body support structure is arranged at the upper end of the second tie beam arc body support structure;
the first tie beam arc body supporting structure is used for supporting and preparing a first tie beam 100 and comprises a lower pier column scaffold 1, a first tie beam arc body bottom template 2 arranged at the upper end of the lower pier column scaffold 1, a first tie beam arc body top template 3 arranged above the first tie beam arc body bottom template 2, two concrete vibrating ports 4 arranged at the upper end of the first tie beam arc body top template 3, and first tie beam side templates 5 arranged at two sides of the lower pier column scaffold 1 and the first tie beam arc body bottom template 2, wherein the first tie beam side templates 5 are used for preparing lower pier columns 300;
the second tie beam arc body supporting structure is used for supporting and preparing the second tie beam 200 and comprises an arc body combined supporting structure base plate 6 arranged at the top of the first tie beam 100, an upper pier column scaffold 7 arranged on the arc body combined supporting structure base plate 6, a second tie beam arc body bottom template 8 arranged at the upper end of the upper pier column scaffold 7, a second tie beam arc body top template arranged above the second tie beam arc body bottom template 8, and second tie beam side templates 9 arranged at two sides of the upper pier column scaffold 7 and the second tie beam arc body bottom template 8 and above the first tie beam side template 5, wherein the second tie beam side templates 9 are used for preparing the upper pier column 400.
The first tie beam arc body bottom template 2, the arc body combined supporting structure backing plate 6 and the second tie beam arc body bottom template 8 are respectively formed by a vertical channel steel support 10, a horizontal channel steel support 11 and an arc steel template 12, and the arc steel template 12 is formed by 6mm double-sided steel plates 13 and 10# channel steel annular ribs 14; the vertical channel steel support and the horizontal channel steel support are 10# channel steel support which are arranged at intervals of 235 mm; the bottom of the vertical channel steel support is fixedly connected with the horizontal channel steel support by adopting a M20 bolt for 10# channel steel.
The construction method of the arc body combined template supporting structure of the ultra-high double-layer arc tie beam comprises the following steps:
1. measuring pay-off
During construction, firstly, according to the coordinates of the center and the axis control points of the pier column, the center elevation, the central axis and the peripheral edge lines of the pier column are accurately measured and discharged from the top surface of the bearing platform by using a total station, the longitudinal and transverse axes of the corresponding upright column are popped up by using ink lines, and corresponding leads are reserved for positioning when the upright template is used. After rechecking by the measurement supervision engineer, the next procedure can be performed. Considering that the pier column of the section is higher, the theodolite is adopted to control the verticality of the pier body in the construction process. After the template is erected to the pier top, the position and the axis control point of the pier top cap are accurately measured and released from the wire point by using a total station, the pier top height and the rechecking of the positions of the pre-buried holes and the pieces are finished.
2. The scaffold of the lower pier stud and the side template of the first tie beam are supported, and the bottom template of the arc body of the first tie beam is supported
The vertical rod of the lower pier stud scaffold 1 adopts a socket type disc buckle type steel pipe support, the pipe diameter is 60.3mm, the wall thickness is 3.2mm, the material is Q355 strength steel, and the characteristics of high strength and high bearing capacity are achieved. The cross rod is made of Q235 steel with the pipe diameter of 48.3mm and the wall thickness of 2.5 mm. The horizontal diagonal draw bar is made of Q235 steel, and the pipe diameter of the horizontal diagonal draw bar is 42mm, the wall thickness of the horizontal diagonal draw bar is 2.5 mm. The vertical diagonal rod is made of Q195 steel, and the pipe diameter is 42mm, the wall thickness is 2.5 mm.
The upright pole is tightly forbidden to be connected with the tie beam supporting frame body, the upright pole connector is connected with the cross rod by adopting a disc buckle, and the upright pole is connected with the cross rod by adopting a disc buckle. The support is erected from 50cm to 60cm away from the outer edge of the structure, and the distance between the transverse rods of the buckle support is adjusted on site.
The vertical pole pitch is 0.9m, the transverse pitch is 0.9m, and the step pitch is 1.5m. The tie beam supporting mode is that the trabecula is perpendicular to the roof beam and strides the direction, and the transverse total width of tie beam bottom pole setting is 4.5m, and support frame top layer horizontal pole cloth distance is 1.0m, and the cantilever length that adjustable bracket stretches out top layer horizontal pole must not be greater than 0.5m, and the tie beam should set up in the middle of the position of pole setting from roof beam both sides.
The slurry produced in the last concrete pouring process is mechanically polished before the first tie beam side template 5 is installed, and then a salad oil release agent is coated, and then the first tie beam side template 5 and the first tie beam arc bottom template 2 are assembled. The first tie beam arc body bottom template 2 is composed of a vertical channel steel support 10, a horizontal channel steel support 11 and an arc steel template 12. The arc steel template 12 consists of 6mm double-sided steel plates 13 and 10# channel steel annular ribs 14; the vertical channel steel support and the horizontal channel steel support are 10# channel steel support which are arranged at intervals of 235 mm; the bottom of the vertical channel steel support is fixedly connected with the horizontal channel steel support by adopting a M20 bolt for 10# channel steel. And optimizing the common tie beam steel template into an arc-shaped body combined template with a flat bottom. The combined template system solves the technical problems that the construction difficulty of the bottom support of the arc-shaped tie beam template is high and the construction of the support frame is unstable.
3. First tie beam reinforcement
And processing the steel bars into the required size and radian of the drawing by using a positioning steel bar processing model, and binding tie bars.
4. The first tie beam arc body top template is supported
Two openable concrete vibrating openings 4 are arranged at the upper part of the first tie beam arc body top template 3. And closing the cover plate of the vibrating port 13 after the concrete is vibrated, wherein the vibrating port 13 is made of the same material as the first tie beam side template 5. The size of the vibrating opening 13 can be determined according to the size of the tie beam or the position of the keel of the first tie beam side template 5. The flange is arranged at the edge of the vibrating port cover plate, M20 bolt holes are reserved, and the cover plate can be connected through M20 connecting bolts and is fixed on the tie beam steel template. Because the arc-shaped tie beam is in a shape with two high ends and a low middle part, the method can fully vibrate the concrete of the tie beam, release air in the concrete pouring process and improve the molding quality of the concrete. And (3) after the concrete is poured to be flush with the vibrating opening, covering a cover plate of the vibrating opening, connecting and fixing the cover plate with an M20 bolt and a steel template, and then pouring the concrete at the rest part of the upper part. Thereby effectively improving the concrete entity quality of the arc-shaped tie beam.
5. Lower pier stud and first tie beam concrete pouring and curing
After the first tie beam side template 5 is erected, before concrete is poured, mortar is used in advance to seal gaps between the bottom of the first tie beam side template 5 and a foundation, so that leakage of mortar is prevented.
Because the lower pier stud 300 has larger height, a string cylinder is arranged before concrete pouring in order to avoid segregation phenomenon caused by larger concrete falling height during concrete pumping. The casting height of each layer of concrete is 30-40 cm, the concrete tamping adopts phi 50 inserted vibrating bars, four operators vibrate simultaneously, and the control range of each operator is 1/4 of the area of the pier column. When vibrating, the vibrator is vertically inserted, fast-in and slow-out, the depth of the vibrator inserted into the lower layer concrete is 5-10cm, and the moving distance is not more than 1.5 times of the radius of the vibrator, namely 45-60 cm.
When the first tie beam 100 is concreted, two switchable concrete vibrating openings 4 are formed in the upper portion of the first tie beam arc-shaped body top template 3, and the size of the vibrating openings 4 can be determined according to the size of the first tie beam 100 or the position of a keel of the first tie beam side template 5. The flange is arranged at the edge of the cover plate of the vibrating port 4, M20 bolt holes are reserved, and after concrete vibration is finished, the cover plate is connected through M20 connecting bolts and fixed on the tie beam steel template. And (3) installing a vibrating port cover plate after concrete pouring and vibrating are completed, and then performing concrete pouring on the pier column at the upper part of the first tie beam 100, wherein the pouring height is 1m higher than the top elevation of the tie beam. The vibration opening of the first tie beam arc body top template 3 can make the tie beam concrete vibrate fully and simultaneously release air generated in the tie beam in the concrete pouring process, so that the concrete forming quality of the tie beam is improved.
And when the strength of the concrete is more than or equal to 10MPa, manually holding a pneumatic pick to chisel off the floating slurry on the top of the bearing platform for the poured surface concrete. The surface of the concrete after roughening treatment is washed by using pressurized water, so that the surface is kept moist but not accumulated, a layer of cement paste (a proper amount of an interfacial agent can be used) or cement mortar with the same components as the concrete is paved, and when the concrete strength of the first tie beam 100 reaches 75% of the design strength, the second tie beam 200 can be erected on the support frame.
6. The scaffold of the upper pier column and the side template of the second tie beam are supported, and the bottom template of the arc-shaped body of the second tie beam is supported
The vertical rod of the upper pier stud scaffold 7 adopts a socket type disc buckle type steel pipe support, the pipe diameter is 60.3mm, the wall thickness is 3.2mm, the material is Q355 strength steel, and the characteristics of high strength and high bearing capacity are achieved. The cross rod is made of Q235 steel with the pipe diameter of 48.3mm and the wall thickness of 2.5 mm. The horizontal diagonal draw bar is made of Q235 steel, and the pipe diameter of the horizontal diagonal draw bar is 42mm, the wall thickness of the horizontal diagonal draw bar is 2.5 mm. The vertical diagonal rod is made of Q195 steel, and the pipe diameter is 42mm, the wall thickness is 2.5 mm.
The upright rod of the supporting frame body is strictly forbidden to be connected with the tie beam supporting frame body, the upright rod connector is connected with the cross rod by adopting a disc buckle, and the upright rod is connected with the cross rod by adopting a disc buckle. The support is erected from 50cm to 60cm away from the outer edge of the structure, and the distance between the transverse rods of the buckle support is adjusted on site.
The vertical pole pitch of the supporting frame body is 0.9m, the transverse pitch is 0.9m and the step pitch is 1.5m. The tie beam supporting mode is that the trabecula is perpendicular to the roof beam and strides the direction, and the transverse total width of tie beam bottom pole setting is 4.5m, and support frame top layer horizontal pole cloth distance is 1.0m, and the cantilever length that adjustable bracket stretches out top layer horizontal pole must not be greater than 0.5m, and the tie beam should set up in the middle of the position of pole setting from roof beam both sides.
An arc body combined support structure backing plate 6 is placed on top of the first tie beam 100 before the upper pier stud scaffold 7 is erected. The arc body combined support structure backing plate 6 consists of a vertical channel steel support 10, a horizontal channel steel support 11 and an arc steel template 12. The arc steel template 12 consists of 6mm double-sided steel plates 13 and 10# channel steel annular ribs 14; the vertical channel steel support and the horizontal channel steel support are 10# channel steel support which are arranged at intervals of 235 mm; the bottom of the vertical channel steel support is fixedly connected with the horizontal channel steel support by adopting a M20 bolt for 10# channel steel. The upper tie beam frame body is supported on the horizontal channel steel. And the stability of the frame body is improved. The physical damage to the first tie beam concrete caused by the overlarge local pressure is reduced.
7. Second tie beam reinforcement
And processing the steel bars into the required size and radian of the drawing by using a positioning steel bar processing model, and binding tie bars.
8. The second tie beam arc body top template is supported
The same as in step 4.
9. Pouring, demolding and curing of upper pier stud and second tie beam concrete
The same as in step 5.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.

Claims (1)

1. The construction method of the arc body combined formwork support structure of the ultra-high double-layer arc tie beam is characterized by comprising the following steps: the support structure comprises a first tie beam arc body support structure and a second tie beam arc body support structure, and the first tie beam arc body support structure is arranged at the upper end of the second tie beam arc body support structure;
the first tie beam arc body supporting structure is used for supporting and preparing a first tie beam and comprises a lower pier column scaffold, a first tie beam arc body bottom template arranged at the upper end of the lower pier column scaffold, a first tie beam arc body top template arranged above the first tie beam arc body bottom template, and first tie beam side templates arranged at two sides of the lower pier column scaffold and the first tie beam arc body bottom template, wherein the first tie beam side templates are used for preparing lower pier columns;
the second tie beam arc body supporting structure is used for supporting and preparing a second tie beam and comprises an arc body combined supporting structure base plate arranged at the top of the first tie beam, an upper pier column scaffold arranged on the arc body combined supporting structure base plate, a second tie beam arc body bottom template arranged at the upper end of the upper pier column scaffold, a second tie beam arc body top template arranged above the second tie beam arc body bottom template, and second tie beam side templates arranged at two sides of the upper pier column scaffold and the second tie beam arc body bottom template and above the first tie beam side template, wherein the second tie beam side templates are used for preparing upper pier columns;
the first tie beam arc body bottom template, the arc body combined supporting structure backing plate and the second tie beam arc body bottom template are supported by vertical channel steel, the horizontal channel steel is supported by an arc steel template, and the arc steel template is composed of 6mm double-side steel plates and 10# groove steel annular ribs; the vertical channel steel support and the horizontal channel steel support are 10# channel steel support which are arranged at intervals of 235 mm; the bottom of the vertical channel steel support is fixedly connected with the horizontal channel steel support by adopting a 10# channel steel through an M20 bolt;
the method comprises the following steps:
(1) Measuring pay-off
In the construction process, firstly, according to coordinates of a pier column center and an axis control point, a total station is used for accurately measuring and discharging the center elevation, the central axis and the peripheral edge of the pier column from the top surface of a bearing platform, ink lines are used for ejecting corresponding vertical and horizontal axes of the upright column, corresponding leads are reserved for positioning when a vertical template is erected, a measuring and supervising engineer can carry out a next procedure after rechecking, taking the fact that the pier column of the section is higher in verticality, a theodolite is adopted for controlling the pier body in the construction process, after the template is erected to the pier top, the total station is used for accurately measuring and discharging the position and the axis control point of the pier top cap from a lead point, the pier top elevation and each reservation are made, and rechecking of the pre-buried holes and part positions are carried out;
(2) The scaffold of the lower pier stud and the side template of the first tie beam are supported, and the bottom template of the arc body of the first tie beam is supported
The upright posts of the lower pier stud scaffold are socket-and-spigot type disc buckle type steel pipe brackets,
the upright posts are strictly forbidden to be connected with the tie beam support frame body, the upright post connectors are connected by adopting disc fasteners, and the upright posts are connected with the cross bars by adopting disc fasteners;
mechanically polishing the slurry in the last concrete pouring process before the first tie beam side template is installed, then brushing salad oil release agent, and then assembling the first tie beam side template and the first tie beam arc-shaped body bottom template;
(3) Binding of first tie beam steel bars
Machining the steel bars into the required size and radian of the drawing by using a positioning steel bar machining model, and binding tie bars;
(4) The first tie beam arc body top template is supported
Two openable concrete vibrating openings are formed in the upper part of the first tie beam arc body top template;
(5) Pouring and curing the concrete of the lower pier stud and the first tie beam
After the first tie beam side template is supported, before concrete is poured, gaps between the bottom of the first tie beam side template and a foundation are plugged by using mortar in advance, so that slurry leakage is prevented;
because the lower pier column is high, in order to avoid segregation phenomenon caused by high falling height of concrete during concrete pumping, a string cylinder is arranged before concrete pouring, the pouring height of each layer of concrete is 30-40 cm, phi 50 plug-in vibrating bars are adopted for concrete tamping, four operators vibrate simultaneously, each control range is 1/4 of the pier column area, when in vibration, a vibrator is vertically inserted, is quickly and slowly inserted into the lower layer of concrete, the depth of the vibrator is 5-10cm, and the moving distance of the vibrator is not more than 1.5 times the action radius of the vibrator, namely 45-60 cm;
when the first tie beam concrete is poured, the size of a vibrating port can be determined according to the size of the first tie beam or the position of a keel of a side template of the first tie beam, a flange is arranged at the edge of a vibrating port cover plate, M20 bolt holes are reserved, the concrete is connected through M20 connecting bolts after being vibrated, the concrete is fixed on the tie beam steel template, the vibrating port cover plate is installed after the concrete is poured and vibrated, and then the concrete pouring of pier columns at the upper part of the first tie beam is carried out, wherein the pouring height is 1M higher than the top elevation of the tie beam;
(6) The scaffold of the upper pier column and the side template of the second tie beam are supported, and the bottom template of the arc-shaped body of the second tie beam is supported
The upright posts of the upper pier stud scaffold are socket-and-spigot type disc buckle type steel pipe brackets,
the upright rod of the supporting frame body is strictly forbidden to be connected with the tie beam supporting frame body, the upright rod connector is connected with the cross rod by adopting a disc buckle, and the upright rod is connected with the cross rod by adopting a disc buckle;
before the upper pier stud scaffold is erected, an arc body combined supporting structure backing plate is placed at the top of the first tie beam, and the upper tie beam frame body is supported on horizontal channel steel of the structure backing plate;
(7) Binding of second tie beam steel bars
Processing the steel bars into the required size and radian of the drawing by using a positioning steel bar processing model, binding tie bars,
(8) The second tie beam arc body top template is supported
The same as (4);
(9) Pouring, demolding and curing the upper pier stud and the second tie beam
The same as in (5).
CN202210565841.1A 2022-05-22 2022-05-22 Arc body combined formwork supporting structure of ultrahigh double-layer arc tie beam and construction method Active CN114892530B (en)

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CN112211113A (en) * 2020-09-28 2021-01-12 中铁三局集团有限公司 Cast-in-place construction method for large-span diamond-shaped bent cap of high pier
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CN112211113A (en) * 2020-09-28 2021-01-12 中铁三局集团有限公司 Cast-in-place construction method for large-span diamond-shaped bent cap of high pier
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