CN112211113A - Cast-in-place construction method for large-span diamond-shaped bent cap of high pier - Google Patents
Cast-in-place construction method for large-span diamond-shaped bent cap of high pier Download PDFInfo
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- CN112211113A CN112211113A CN202011039660.2A CN202011039660A CN112211113A CN 112211113 A CN112211113 A CN 112211113A CN 202011039660 A CN202011039660 A CN 202011039660A CN 112211113 A CN112211113 A CN 112211113A
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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
- E01D21/10—Cantilevered erection
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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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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Abstract
The invention relates to a construction method for cast-in-place of a large-span diamond-shaped bent cap beam of a high pier, which adopts a two-part support system to realize the construction of cast-in-place of a diagonal leg and a bent cap beam, wherein the first part forms a combined support system through 45a double-spliced I-steel, a channel steel bracket and an inclined bracket, and realizes the construction of cast-in-place of a diagonal leg supporting bent cap beam structure; and the second part is that fastener type steel pipe full-space supports are erected at the hollow structure on the tie beam after pouring and consolidation, square timber and templates are laid, and the cast-in-place construction of the beam is realized. The construction method is a very simple, effective, safe, reliable, rapid and economic construction scheme for viaducts and municipal bridges constructed under complex conditions of high piers crossing rivers, valleys, soft soil foundations and the like. By adopting the construction technology, the defects of difficult construction, long construction period, high cost, high risk, multiple potential safety hazards and the like of the traditional bracket are overcome.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a construction method of a bridge, in particular to a cast-in-place construction method of a large-span diamond-shaped bent cap of a high pier.
Background
Most of pier bent caps of the existing highway and municipal bridge are of cylindrical pier connection square bent cap structures, and the construction method mainly comprises 3 steps: the method comprises the following steps that firstly, a steel bar method is adopted, namely, the steel bar is arranged on a cylindrical pier, a screw jack is arranged on the steel bar, and an I-shaped steel beam is arranged on the screw jack to form a template supporting system; the second is the anchor ear method, namely while constructing the cylinder pier, increase the back arris outside the template, as the bearing point, mount jack or wedge steel plate on the back arris, mount the I-steel crossbeam on the steel plate, form the template support system; and thirdly, a support method, namely, a support is erected from the ground to the bottom of the capping beam to be used as a capping beam construction bearing frame body. The first and second construction methods are mainly applicable to common bent cap beams and are not applicable to bent cap beams with large span, ultra-wide sections and ultra-long inclined legs; the third method is only suitable for low pier capping beam construction, and when high pier capping beam construction is carried out, the length-slenderness ratio of the frame body is large, the stability is poor, and the construction cost is high.
Disclosure of Invention
The invention aims to solve the problems of difficult template erection, long construction period, high cost, large risk, multiple hidden dangers and the like of the existing high pier capping beam construction method, and provides a high pier long-span diamond-shaped capping beam cast-in-situ construction method.
The method is realized by the following technical scheme:
a construction method for cast-in-place of a large-span diamond-shaped bent cap of a high pier comprises the following steps:
1) construction of a cantilever type supporting structure: reserving holes on the standard section of the built straight pier, inserting steel bars into the reserved holes, erecting 45a double-spliced I-shaped steel on the steel bars, oppositely pulling and fixing two ends of the 45a double-spliced I-shaped steel by using diagonal draw bars, and forming a cantilever type supporting structure by the fixed 45a double-spliced I-shaped steel;
2) and (3) beam tying construction: erecting a support tie beam bottom die full support platform on the 45a double-spliced I-shaped steel, installing a template, and pouring concrete to build a tie beam;
3) oblique leg construction: the method comprises the following steps that 45a double-spliced I-steel is used as a force bearing point, channel steel brackets which are integrally square are respectively installed and fixed at positions, located on two sides of a transverse bridge towards a pier stud, on the 45a double-spliced I-steel, inclined plane brackets which are integrally triangular prism-shaped are erected on the channel steel brackets, inclined leg side dies are installed and bound with reinforcing steel bars, inclined leg formworks are connected with the inclined plane brackets, and the channel steel brackets, the inclined plane brackets and the inclined leg formworks form a stress system integrally; then arranging a through length pair pull rod between the inclined leg side forms to reinforce the inclined leg template, and pouring concrete to build the inclined leg;
4) and (3) bent cap construction: and erecting a fastener type steel pipe full support at a hollow structure between the two groups of oblique legs on the poured and consolidated tie beam, installing a capping beam template, pouring concrete to build the capping beam, and finally forming a diamond-shaped structure by the capping beam, the two groups of oblique legs and the tie beam.
As an optimal technical scheme, in the construction process of the cantilever type supporting structure, the reserved holes are made of steel pipes with the diameter of 16cm, and the length of the 45a double-spliced I-shaped steel is 24 m.
As an optimal technical scheme, an upper layer of tie beam working platform and a lower layer of tie beam working platform are arranged in the tie beam construction process, the bottom layer is erected along 45a double-spliced I-shaped steel, and the top layer is erected along a tie beam template.
As a preferred technical scheme, in the construction process of the inclined leg, at least 2 through-length counter-pull rods are arranged on each formwork according to the block length of an inclined leg formwork, and the through-length counter-pull rods are subjected to threaded finish rolling with the diameter of 32 mm.
As the preferred technical scheme, in the construction process of the bent cap, the step pitch of the fastener type steel pipe full-space bracket is 60cm by 30cm, and the top support and the bottom support are arranged above and below the steel pipe.
The diamond-shaped bent cap in the method is formed by two groups of inclined legs and a bent cap arranged between the two groups of inclined legs, a hollow structure is arranged between the two groups of inclined legs, and the bent cap, the inclined legs and the hollow structure form a structure similar to a diamond shape. The method of the invention mainly realizes the cast-in-place construction of the inclined leg and the cover beam by adopting two parts of support systems, wherein the first part is a combined support system, and the second part is a cover beam template support system. The combined supporting system consists of a cantilever type supporting structure, a channel steel bracket and an inclined plane bracket, 45a double-spliced I-shaped steel is used as a main supporting structure of the bent cap template, and two ends of the I-shaped steel are fixed at the bottom of an inclined leg by a diagonal draw bar, so that the stability of the supporting system is ensured; channel-section steel bracket and inclined plane bracket are as the main bearing structure of slant leg template, and the logical length between the slant leg template is to the pull rod and can consolidate the slant leg template stability under the high buttress condition to the quality and the safety of construction have been guaranteed. The bent cap formwork support system is a fastener type steel pipe full support which is arranged on the tie beam and located in a hollow structure between the two groups of inclined legs, and laid square timbers, bent cap formworks and the like, and finally cast-in-place construction of the bent cap is achieved.
The construction method is a very simple, effective, safe, reliable, rapid and economic construction scheme for viaducts and municipal bridges constructed under complex conditions of high piers crossing rivers, valleys, soft soil foundations and the like. By adopting the construction technology, the defects of difficult construction, long construction period, high cost, high risk, multiple potential safety hazards and the like of the traditional bracket are overcome.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of the construction method of the present invention.
In the figure: 1-straight pier, 2-45a double-spliced I-steel, 3-diagonal draw bars, 4-tie beams, 5-channel steel brackets, 6-inclined plane brackets, 7-through long counter-draw bars, 8-inclined legs, 9-fastener type steel pipe full-space supports and 10-bent cover beams.
Detailed Description
In order that those skilled in the art will better understand the present invention, a more complete and complete description of the present invention is provided below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
As shown in fig. 1, a construction method for cast-in-place of a large-span diamond-shaped bent cap of a high pier comprises the following steps:
1) construction of a cantilever type supporting structure: reserving holes in a standard section of the built straight pier 1, wherein the reserved holes are made of steel pipes with the diameter of 16cm, inserting steel rods into the reserved holes, erecting 45a double-spliced I-shaped steel 2 with the length of 24m on the steel rods, oppositely pulling and fixing two ends of the 45a double-spliced I-shaped steel 2 by using diagonal draw bars 3, and forming a cantilever type supporting structure by the fixed 45a double-spliced I-shaped steel 2;
2) and (3) beam tying construction: erecting a supporting tie beam bottom die full support platform on the 45a double-spliced I-shaped steel 2, arranging an upper tie beam working platform and a lower tie beam working platform, erecting a bottom layer along the 45a double-spliced I-shaped steel 2, erecting a top layer along a tie beam template, installing a template, and pouring concrete to build a tie beam 4;
3) oblique leg construction: the method comprises the following steps that 45a double-spliced I-steel 2 is used as a force bearing point, channel steel brackets 5 which are integrally square are respectively installed and fixed at positions, located on two sides of a pier column, of a transverse bridge on the 45a double-spliced I-steel 2, inclined plane brackets 6 which are integrally triangular prism-shaped are erected on the channel steel brackets 5, inclined leg side dies are installed and bound with reinforcing steel bars, inclined leg templates are connected with the inclined plane brackets 6, and the channel steel brackets 5, the inclined plane brackets 6 and the inclined leg templates form a stress system integrally; then arranging a through-length counter-pull rod 7 between the inclined leg side dies to reinforce the inclined leg template, reasonably distributing inclined leg template sections during specific implementation, ensuring that at least 2 through-length counter-pull rods are arranged on each template to bear force according to the block length of the inclined leg template, and adopting threaded finish rolling with the diameter of 32mm for the through-length counter-pull rods; finally, pouring concrete to build the inclined leg;
4) and (3) bent cap construction: and erecting a fastener type steel pipe full-space bracket 9 at a hollow structure between the two groups of oblique legs 8 on the poured and consolidated tie beam 4, wherein the step pitch of the fastener type steel pipe full-space bracket 9 is 60cm x 30cm, the upper part and the lower part of the steel pipe are provided with a top support and a bottom support, installing a template, pouring concrete to build a cover beam 10, and finally forming a diamond modeling structure by the cover beam 10, the two groups of oblique legs 8 and the tie beam 4.
The following provides a specific construction example to further describe and explain the technical scheme of the invention:
a construction method for cast-in-place of a large-span diamond-shaped bent cap of a high pier comprises the following steps:
construction of straight pier body
1. Measuring line
A total station is adopted to discharge four corners of the pier body, and the height of the first mold is determined (the pier body is prevented from being integrally lifted, and 2cm is reserved for adjusting the height of the first mold during pouring of the bearing platform);
and when the template is raised, the total station is adopted to measure the position of the template again to prevent the deviation of the pier stud after each die assembly.
2. Binding reinforcing steel bar
Prepare to connect the racking muscle, with cushion cap or pier shaft top surface clearance, chisel hair, wash totally, back according to design requirement ligature pier shaft reinforcing bar, main muscle interval of adjustment guarantees main muscle perpendicular to horizontal plane, and main muscle is linked and is adopted muffjoint, and adjustment pier shaft four sides protective layer thickness is if carry out the reinforcement after the ligature reinforcing bar height is too high needs the compound die.
3. Formwork installation
Pier shaft steel mould is for the factory-made bold design steel mould, every template height 2.5M (the straight pier is furnished with in addition with 0.5M, the high regulation festival of 1M), the pull rod is phi 20mm round steel, connection between the template adopts M22 bolt band cap, the steel mould installation adopts the manual fit crane to go on, when installing the steel mould bolt, should one just anti-installing, and screw up, every bolt must not all neglected loading, the steel mould of installing must stabilize firmly, the installation allowable deviation limit value is: the axial position is 5mm, the surface flatness is 3mm, the elevation is +/-5 mm, the lateral bending h/1000 (mm) of the template, the inner side width is +10, -5mm, and the height difference between the surfaces of two adjacent templates is 2 mm. The pull rod is made of round steel with the diameter of 20mm, the round steel extends out of the hoop by about 6-10cm, the length of the mantle fiber is 15cm, the pull rod is in a double-cap type, the pull rod must be tightened, the steel bars inside the pier body cannot be in contact with the pull rod, the deformation of the pull rod is prevented, a PE pipe is sleeved outside the pull rod and separated from concrete, and a formwork seam is sealed by a double-sided rubber sealing strip.
A working platform: every 2.5m standard festival template top surface sets up ring pier body work platform, and the platform supports and adopts the bracket to link in the template, and the platform footboard adopts the plank of enough thickness to lay (the plank must prevent the plank perk in the bracket is fixed), and the platform guardrail adopts scaffold steel pipe to set up.
4. Installation ladder stand
When the pier stud is constructed, a safe ladder stand is erected, a safety net is arranged, and when the pier stud is installed, the upper layer vertical rod and the lower layer vertical rod are connected and locked by matched screws when each layer is heightened, so that the overall stability of the ladder stand is ensured, reasonable adhesion with the pier stud is carried out according to the actual height, and the pier stud cannot be installed upwards continuously when the corresponding adhesion is not carried out; when the ladder is not horizontally arranged, one end of the connecting ladder stand body is lower than one end connected with the pier column main body structure, and the gradient of the pier connecting piece is smaller than (1: 3); the adhesion is required to be strengthened at the height of more than 30 m, one layer of adhesion is required to be made every 3m, the adhesion is ensured to be firm, the erected safe ladder stand channel pier stud is adhered together when in adhesion, only a reliable adhesion body is required, the scaffold steel pipe and the fastener are firmly fixed on the adhesion body, and the scaffold steel pipe and the fastener can also be fixed in a welding mode.
5. Pouring concrete
Before pouring, removing impurities in the template, stains on the steel bars and the like, and further checking whether the template, the reinforcement, the support, the steel bar framework and the embedded members meet the requirements or not; when the pouring height of each pier of concrete reaches 1.67m of the bottom of the girder, 4 steel pipes with the diameter of 16cm are embedded in the longitudinal direction of the bridge; in the process of pouring, a special person is arranged to check the template, the bracket and the like, and the problems of deformation, mold expansion and the like are found and treated in time; the free pouring height of the concrete during pouring is not more than 2m, so that the phenomena of overlarge impact on the template and segregation are prevented; continuously and horizontally pouring the pier body concrete in layers, wherein the thickness of each layer is not more than 1.25 times of the length of the action part of the tamping bar, and the output quantity of the concrete is correctly calculated according to the engineering quantity and the pouring and tamping speed of each layer so as to ensure that the connection time of the upper layer concrete and the lower layer concrete is finished before initial setting; when the intermittence time exceeds the allowable time (generally the initial setting time of concrete) due to reasons, performing interruption treatment according to pouring, leveling the surface, reserving construction joints, and when new concrete is continuously connected, pre-burying the joint ribs according to the construction joint treatment; when the concrete is vibrated, the inserted vibrating rod is used for vibrating, the vibrating time and the vibrating times are controlled based on the condition that the concrete does not generate air bubbles and sink, over-vibration or leakage vibration is prevented, and meanwhile, when the concrete on the upper layer is vibrated, the vibrating rod is inserted into the position which is more than 50mm below the surface of the lower layer, so that the upper layer and the lower layer are connected into a whole.
6. Demolishing form
Installing the top layer, the outer layer of railings and the upright post, and paving the scaffold board, wherein the scaffold board with obvious scars and cracks cannot be used, and workers cannot step on the probe board when walking; the template dismounting and mounting are both double-layer operation, when the template is dismounted, the template dismounting and mounting are carried out according to a specified procedure, firstly, the hanger hook is fastened, and then the template is dismounted; the template, materials and tools cannot be thrown downwards, and a certain safety distance should exist between constructors and the template.
7. Maintaining
Manual demoulding, mechanical hoisting, light taking and light placing are carried out, and the structure and the appearance quality of concrete are prevented from being damaged; after the pier is removed, the pier body is tightly covered by a plastic film immediately, the water vapor of the concrete evaporates and is maintained, and the top surface of each layer of poured pier body needs to be maintained by sprinkling water to prevent the water of the concrete from evaporating too fast to form shrinkage cracks.
Second, tie beam construction
1. Installation support system
The method comprises the steps of pre-embedding 4 steel pipes with the diameter of 16cm into steel rods with the diameter of 12cm before pouring straight piers at the bottom of a beam, wherein the steel rods are used for supporting 45a double-spliced I-steel with the length of 24m, the I-steel is installed in place by a crane, the I-steel on the two sides of a pier column is pulled oppositely by diagonal draw bars to prevent displacement, and a supporting beam bottom die full-hall support platform is erected by 25a I-steel after the 45a double-spliced I-steel is fixed.
2. Bottom die and working platform
The tie beam working platform is provided with two layers, the bottom layer is erected along 45a double-spliced I-shaped steel, the bottom layer working platform needs to be erected after the 45a double-spliced I-shaped steel is fixed, and the top layer working platform is erected along the tie beam template.
3. The procedures of binding the reinforcing steel bars, closing the dies, pouring and the like are the same as those of the construction of the straight pier.
Construction of three-oblique leg
A welded channel steel bracket which is integrally square is arranged on 45a double-spliced I-shaped steel for supporting tie beams on two sides of a pier stud of a transverse bridge, an inclined plane bracket which is integrally triangular prism-shaped is erected on the channel steel bracket, the inclined plane bracket is an inclined leg side mold tripod, an inclined leg side mold (an inclined leg mold plate is two sections of mold plates with the height of 2 m) is installed after the inclined plane bracket is installed in place, reinforcing steel bars begin to be bound after a first section of four-side mold plate and a second section of transverse bridge are installed, and an inclined leg second section of mold plate needs to be installed when the binding height of the reinforcing steel bars exceeds that of the first section of mold plate.
And after the template and the steel bars are bound, 9 fine rolled steel screws with the inclined legs of 32mm in diameter are installed, the deformed steel screws penetrate from the middle to the two sides, and two connectors are arranged in the middle.
And after the finish-rolled thread steel is installed, the top surface position of the inclined leg is retested, the position of the inclined leg is adjusted by using the counter-pulling of the finish-rolled thread steel, the inclined plane bracket is reinforced, and then concrete pouring and subsequent processes are performed.
Construction of four, capping beam
The bottom template of the hollow part of the capping beam utilizes the part of a bottom template at a normal section, a fastener type steel pipe full support is arranged on a poured tie beam, the steel pipe support with the step pitch of 60cm x 30cm is used for bottom template support, a jacking and a bottom support are arranged above and below the steel pipe, and the jacking and the bottom support are adjusted according to the measured elevation so that the elevation of the bottom plate of the capping beam reaches the design elevation; the top support and the bottom support of the support are provided with 10cm square timbers for connection, the support top is provided with working platforms along the transverse bridge to two sides, and the platforms are connected with the inclined leg action platform.
1. Form making and installation
The bent cap template is processed by a professional manufacturer, a shaped steel template is adopted, and the template is formed by rolling a thick steel plate; in order to improve the appearance quality of concrete, the templates are assembled on site in a trial mode, rust is removed, and staggered platforms are leveled by a handheld electric grinding wheel; before the template is installed each time, the rust on the surface of the template must be polished by an electric steel wire brush, after the template is smooth, bright and free of dirt, a release agent is brushed, a thin rubber belt is clamped at a joint, and putty is used for leveling the thin rubber belt; the template coated with the release agent is used as soon as possible, and the template which is not used for a long time is cleaned and then coated with the release agent again.
The bent cap template adopts the installation of manual work cooperation crane, and the thickness that will pay attention to the reinforcing bar protective layer during the template installation satisfies design and standard requirement, and the template installation back guarantees that the pull rod is taut, adjusts the straightness that hangs down of template to guarantee the stability of template.
And after the installation is finished, detecting the top deviation by using a total station, and reporting to a field management group for inspection and acceptance.
2. Pouring of concrete
The bent cap adopts the stirring station to concentrate and mixes, and the concrete mixer truck transportation adopts crane hoist and mount hopper pouring concrete or pump truck to pour, should calculate the construction mix proportion according to theoretical mix proportion and the water content of gathering materials before mixing the station and opening the dish, and when mixing the concrete batching, various weighing apparatus of stirring station should keep accurate, should often detect the water content of aggregate, and rainy day construction should increase the survey number of times, according to adjustment aggregate and water consumption. The stirring time of the concrete is strictly controlled during construction, the concrete is required to be uniform and consistent in color after being stirred, segregation and bleeding phenomena cannot occur, and the slump meets the requirement.
In order to meet the requirements of the setting speed and the pouring speed of the concrete, the pouring work is uninterrupted, and the uniformity and the specified slump are still kept when the concrete is transported to a pouring place, wherein the concrete is transported by adopting a mixing transport vehicle.
Before concrete pouring, the template and the steel bar are checked and recorded, and after the concrete is checked to meet the design requirements, concrete construction is started. When pouring the pier concrete, in order to prevent the concrete from segregating, the concrete adopts layered pouring, and is paved layer by layer according to a layer of 30cm, and the concrete discharge hopper must be separated from the template during pouring, so as to avoid colliding the reinforcing steel bars in the operation process. During the operation of the discharge hopper, the concrete is guided by the directional cylinder in the falling process, so that the concrete is prevented from being separated, the aggregates falling at one position are dispersed and poured, and the aggregates with large particles are not allowed to be concentrated on the side of the leaning template. The concrete is vibrated by adopting an inserted vibrator, the distance between a vibrating rod and a template is not less than 10cm during vibration, the vibrating rod is kept vertical as much as possible, the principle of fast inserting and slow pulling and equidistant arrangement of vibration points is followed during vibration, and the concrete is vibrated until the concrete does not sink any more, the surface is flat, no obvious bubbles rise and thin cement paste appears on the surface, so that the quality problems and the appearance defects caused by early vibration, leakage vibration, under vibration, over vibration and the like are avoided.
During concrete pouring, a specially-assigned person is arranged to check the stability of the bracket, the template, the steel bar, the embedded part and the like, and timely treatment is carried out when looseness, deformation and displacement are found.
After the strength of the concrete reaches more than 2.5Mpa, the side mould can be removed.
3. Concrete health preserving
And (5) after the concrete is finally set, watering and maintaining, and covering the top surface of the pier column with geotextile to keep moist. And (3) immediately removing the formwork after the concrete reaches the formwork removal strength, then integrally wrapping the cover beam by using a plastic film, carrying out drip curing, and placing a leakage bucket on the top of the cover beam to keep the humidity.
The embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (5)
1. A construction method for cast-in-place of a large-span diamond-shaped bent cap of a high pier is characterized by comprising the following steps:
1) construction of a cantilever type supporting structure: reserving holes on the standard section of the built straight pier, inserting steel bars into the reserved holes, erecting 45a double-spliced I-shaped steel on the steel bars, oppositely pulling and fixing two ends of the 45a double-spliced I-shaped steel by using diagonal draw bars, and forming a cantilever type supporting structure by the fixed 45a double-spliced I-shaped steel;
2) and (3) beam tying construction: erecting a support tie beam bottom die full support platform on the 45a double-spliced I-shaped steel, installing a template, and pouring concrete to build a tie beam;
3) oblique leg construction: the method comprises the following steps that 45a double-spliced I-steel is used as a force bearing point, channel steel brackets which are integrally square are respectively installed and fixed at positions, located on two sides of a transverse bridge towards a pier stud, on the 45a double-spliced I-steel, inclined plane brackets which are integrally triangular prism-shaped are erected on the channel steel brackets, inclined leg side dies are installed and bound with reinforcing steel bars, inclined leg formworks are connected with the inclined plane brackets, and the channel steel brackets, the inclined plane brackets and the inclined leg formworks form a stress system integrally; then arranging a through length pair pull rod between the inclined leg side forms to reinforce the inclined leg template, and pouring concrete to build the inclined leg;
4) and (3) bent cap construction: and erecting a fastener type steel pipe full support at the hollow structure between the two groups of oblique legs on the poured and consolidated tie beam, installing a template, pouring concrete to build a capping beam, and finally forming a diamond-shaped structure by the capping beam, the two groups of oblique legs and the tie beam.
2. The high pier large-span diamond-shaped capping beam cast-in-place construction method according to claim 1, characterized in that: in the cantilever type supporting structure construction process, the reserved hole is made of a steel pipe with the diameter of 16cm, and the length of the 45a double-spliced I-shaped steel is 24 m.
3. The high pier large-span diamond-shaped capping beam cast-in-place construction method according to claim 1, characterized in that: in the process of tie beam construction, an upper tie beam working platform and a lower tie beam working platform are arranged, the bottom layer is erected along 45a double-spliced I-shaped steel, and the top layer is erected along a tie beam template.
4. The high pier large-span diamond-shaped capping beam cast-in-place construction method according to claim 1, characterized in that: in the inclined leg construction process, according to the length of each inclined leg template block, at least 2 through-length counter-pull rods are arranged on each template, and the through-length counter-pull rods are subjected to threaded finish rolling with the diameter of 32 mm.
5. The high pier large-span diamond-shaped capping beam cast-in-place construction method according to claim 1, characterized in that: in the capping beam construction process, the step pitch of the fastener type steel pipe full-space support is 60cm x 30cm, and the upper portion and the lower portion of each steel pipe are provided with a jacking portion and a bottom support.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113089487A (en) * | 2021-03-26 | 2021-07-09 | 上海啸崇建设工程有限公司 | Construction method of bridge pier |
| CN114657882A (en) * | 2022-03-25 | 2022-06-24 | 南通大学 | Super-huge type 0# block cast-in-place box girder bracket structure and mounting method thereof |
| CN114892530A (en) * | 2022-05-22 | 2022-08-12 | 中建八局第二建设有限公司 | Arc-shaped body combined template supporting structure of ultrahigh double-layer arc-shaped tie beam and construction method |
| CN118004904A (en) * | 2024-04-08 | 2024-05-10 | 中铁三局集团有限公司 | Hoisting type construction work platform |
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| CN113089487A (en) * | 2021-03-26 | 2021-07-09 | 上海啸崇建设工程有限公司 | Construction method of bridge pier |
| CN113089487B (en) * | 2021-03-26 | 2023-01-13 | 上海啸崇建设工程有限公司 | Construction method of bridge pier |
| CN114657882A (en) * | 2022-03-25 | 2022-06-24 | 南通大学 | Super-huge type 0# block cast-in-place box girder bracket structure and mounting method thereof |
| CN114892530A (en) * | 2022-05-22 | 2022-08-12 | 中建八局第二建设有限公司 | Arc-shaped body combined template supporting structure of ultrahigh double-layer arc-shaped tie beam and construction method |
| CN114892530B (en) * | 2022-05-22 | 2023-10-03 | 中建八局第二建设有限公司 | Arc body combined formwork supporting structure of ultrahigh double-layer arc tie beam and construction method |
| CN118004904A (en) * | 2024-04-08 | 2024-05-10 | 中铁三局集团有限公司 | Hoisting type construction work platform |
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