CN113463510A - Prefabricated T-beam integral embedded guardrail structure and construction method thereof - Google Patents
Prefabricated T-beam integral embedded guardrail structure and construction method thereof Download PDFInfo
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- CN113463510A CN113463510A CN202110758015.4A CN202110758015A CN113463510A CN 113463510 A CN113463510 A CN 113463510A CN 202110758015 A CN202110758015 A CN 202110758015A CN 113463510 A CN113463510 A CN 113463510A
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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
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-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
- 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention relates to the technical field of construction, in particular to a prefabricated T-beam integral embedded guardrail structure and a construction method thereof, wherein the prefabricated T-beam integral embedded guardrail structure comprises embedded guardrails which are arranged on two sides of a prefabricated beam along the length direction of the prefabricated beam; the embedded guardrail comprises guardrail embedded parts which are arranged in parallel and a concrete cast-in-place layer which is poured outside the guardrail embedded parts; the guardrail embedded part is connected with a steel bar framework of the precast beam; the guardrail embedded part is of a broken line type structure formed by continuously bending a steel bar into an inclined section, a right-angle section and a broken line section; the embedded part of the anti-collision guardrail adopts an integrally formed structure, so that the use of materials is reduced, and the economic cost is reduced.
Description
Technical Field
The invention relates to the technical field of beam bridge construction, in particular to a prefabricated T-shaped beam integral embedded guardrail structure and a construction method thereof.
Background
The existing T-beam anti-collision guardrail steel bar is pre-buried and later-stage welding process, the anti-collision guardrail is composed of multiple sections, the guardrail steel bar is formed by welding multiple sections, double-sided vertical welding is needed, the process is complex, the welding quantity is large, the processing difficulty is increased, the construction flow is increased, the work efficiency is reduced, in the actual field construction process, the welding quality of the guardrail steel bar is frequently encountered, the cost consumption is high, and hidden dangers exist in later-stage quality.
Disclosure of Invention
The invention aims to provide a prefabricated T-shaped beam integral pre-embedded guardrail steel bar structure, which solves the problems that in the prior art, an anti-collision guardrail needs to be welded after being pre-embedded through a multi-section structure, time and labor are wasted, and the construction efficiency is low.
Meanwhile, the invention also provides a construction method of the prefabricated T-beam integral embedded guardrail structure.
The technical scheme for achieving the aim comprises the following steps: a prefabricated T-beam integral pre-buried guardrail structure is characterized by comprising pre-buried guardrails which are arranged on two sides of a prefabricated beam along the length direction of the prefabricated beam; the embedded guardrail comprises guardrail embedded parts which are arranged in parallel and a concrete cast-in-place layer which is poured outside the guardrail embedded parts; the guardrail embedded part is connected with a steel bar framework of the precast beam; the guardrail embedded part is a broken line type structure formed by continuously bending a steel bar into an inclined section, a right-angle section and a broken line section.
Further limiting, the right-angle section comprises a first right-angle side and a second right-angle side, the bottom of the inclined section is connected with the first right-angle side, the included angle between the bottom of the inclined section and the vertical direction is 4-6 degrees, and the broken line section comprises a first broken line section vertically connected with the second right-angle side, a third broken line section inclined in the same direction as the inclined section and a second broken line section connected between the first broken line section and the third broken line section; the inclined section, the right-angle section and the broken line section are connected to form a b-shaped structure.
Further limiting, the ratio of the length of the first right-angle side to the length of the second right-angle side is 1: 1-1.2, and the length of the first right-angle side is 20-35 cm.
Further inject, the slope section includes the minor face section of long limit section and long limit section top buckling, long limit section is connected with first right-angle side, the minor face section is parallel with the second right-angle side, the minimum interval between long limit section and the third fold line section is 2 ~ 5 cm.
Further limiting, the horizontal arrangement distance of the guardrail embedded parts is 10-15 cm, and the total height of the guardrail embedded parts is 80-150 cm.
Further limiting, the tops of the guardrail embedded parts are connected with each other through steel strands.
Further inject, guardrail built-in fitting, the beam section part of setting between the front beam end of precast beam and back beam end, the guardrail built-in fitting of the front beam end of precast beam and back beam end both sides extends to the upper surface of precast beam or pre-buries the reinforcing bar that is equipped with local bending respectively in the front beam end of precast beam and back beam end both sides.
The construction method for integrally embedding the guardrail in the prefabricated T-shaped beam is characterized by comprising the following steps of:
step 2, paving guardrail embedded parts in sequence along the length direction of the T beam away from the middle beam section part of the front beam end and the rear beam end, and then pouring concrete;
step 3, additionally arranging a support mechanism on the beam end of the T beam and the diaphragm plate to ensure the integral stability of the beam body;
step 4, increasing the clearance height of the hoisting device to finish hoisting the T-shaped beam;
and 5, heightening the longitudinal slope of the bridge with the rear anchor support legs of the bridge girder erection machine, disassembling the support legs and the runway in the bridge girder erection machine, respectively transferring and advancing, and finishing the cross-span process by the bridge girder spanning machine, namely finishing the construction of the integrally pre-buried guardrail of the prefabricated T-shaped beam.
Further limiting, the length of the front beam end in the step 2 corresponds to the position width of a support leg in the bridge erecting machine; the length of the rear beam end corresponds to the width of the position of the rear anchor supporting leg of the bridge girder erection machine.
Further limiting, the concrete method for continuously bending and processing the reinforcing steel bars into the guardrail embedded parts according to the design requirements comprises the following steps:
1.1, bending from the top end of the steel bar to form a short side section of an inclined section;
step 1.2, bending the short edge section to form a long edge section of an inclined section, wherein an included angle between the long edge section and the short edge section is 84-86 degrees, and the length of the long edge section is 80-115 cm;
step 1.3, bending the long side section to form a first right-angle side and a second right-angle side which are perpendicular to each other, wherein the length ratio of the first right-angle side to the second right-angle side is 1: 1-1.2, and the length of the first right-angle side is 20-35 cm;
step 1.4, bending the second right-angle edge to form a first fold line segment in the fold line segments, wherein the first fold line segment is perpendicular to the second right-angle edge, and the length of the first fold line segment is the same as that of the first right-angle edge;
step 1.5, bending the first broken line segment to form a second broken line segment, wherein the second broken line segment is inclined towards the long side segment, and the included angle between the second broken line segment and the first broken line segment is 45-65 degrees;
and step 1.6, bending the second broken line segment to form a third broken line segment, and finishing the processing of the guardrail embedded part, wherein the third broken line segment and the long side segment have the same inclination direction, the minimum distance between the third broken line segment and the long side segment is 2-5 cm, and the overall height of the guardrail embedded part is 80-150 cm.
Compared with the prior art, the beneficial effect of this application:
1. the embedded part of the anti-collision guardrail adopts an integrally formed structure, the use of materials is reduced, the economic cost is reduced, most importantly, a curve-shaped structure is formed by an inclined section, a right-angle section and a broken line section of embedded steel bars, on one hand, no welding point exists, the problem that the welding quality is unreliable caused by a traditional multi-section double-side welding construction mode is solved, on the other hand, the embedded part is processed into a special b-shaped structure through integrally forming the whole section of steel bars, the stress and the bearing capacity of the guardrail are greatly increased, the stress of a T beam can be effectively dispersed and decomposed, and the clearance height and the bearing capacity of the T beam are improved;
2. this application integrated into one piece's anticollision barrier built-in fitting has avoided a large amount of welding jobs, has improved work efficiency, has avoided welding quality problem, has guaranteed construction quality, has further reduced the input cost.
Drawings
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
in the figure: 1-embedded parts of guardrails; 11-an inclined section; 12-a right angle section; 13-broken line segment.
Detailed Description
Referring to fig. 1, an embodiment of the present invention: the utility model provides a whole pre-buried guardrail structure of prefabricated T roof beam, includes pre-buried guardrail, pre-buried guardrail is including the guardrail built-in fitting 1 that arranges side by side and the cast-in-place layer of concrete of pouring in the 1 outside of guardrail built-in fitting, guardrail built-in fitting 1 is including connecting gradually and lie in the slope section 11, right angle section 12 and broken line section 13 in the coplanar, guardrail built-in fitting 1 is buckled in succession by a reinforcing bar and is formed, can select the reinforcing bar that the diameter is 18mm in order to satisfy structural strength, satisfies the bearing capacity.
Guardrail built-in fitting 1 is whole to be inverted-Y-shaped structure, whole height is 80 ~ 150cm, slope section 11 is 7 font structures, slope section 11 is including the short side section and the long side section that connect gradually, short side section level sets up, the one end that long side section was kept away from to the short side section is provided with the arc hook structure of an opening towards long side section, arc hook structure is including the circular arc section and the straightway that connect gradually, the straightway is located the below of circular arc section, the central angle of circular arc section is 60 ~ 85, the straightway is tangent with the bottom of circular arc section, the other end of short side section is connected with the top of long side section, long side section is 4 ~ 6 with the contained angle of vertical direction, the contained angle of long side section and short side section is 84 ~ 86 promptly, the length of long side section is 80 ~ 115 cm.
The right-angle section 12 comprises a first right-angle side and a second right-angle side which are perpendicular to each other, the first right-angle side is vertically arranged and connected with the bottom of the long-edge section, the second right-angle side is horizontally arranged and parallel to the short-edge section, the length of the first right-angle side is 20-35 cm, the length ratio of the first right-angle side to the second right-angle side is 1: 1-1.2, in order to avoid stress concentration, the corner where the first right-angle side and the second right-angle side are connected can be bent into an arc with a central angle of 90 degrees, and the structural strength is improved.
The broken line section 13 is a three-section structure, including first broken line section in proper order from bottom to top, second broken line section and third broken line section, the bottom of first broken line section is connected with the end on second right-angle side, first broken line section sets up with the second right-angle side is perpendicular, it is excessive to adopt the circular arc like above-mentioned mode, the contained angle that second broken line section and third broken line section formed is 45 ~ 65, second broken line section inclines to long limit section, namely second broken line section from the bottom up is close to long limit section gradually, third broken line section slope sets up, and long limit section is kept away from bottom to top to third broken line section, make the minimum interval of third broken line section and long limit section be 2 ~ 5cm, reserve the interval and can avoid the reinforcing bar contact of two places to increase the rate of rotting embroidery, in subsequent construction, make the concrete of pouring fill form the protective layer between third broken line section and long limit section, increase of service life.
The top parts of adjacent fence embedded parts 1 are connected through steel strands, the guardrail embedded parts 1 are arranged on beam sections between the front beam end and the rear beam end of the precast beam, and the guardrail embedded parts 1 on the two sides of the front beam end and the rear beam end of the precast beam extend to the upper surface of the precast beam or are respectively embedded with local bent steel bars on the two sides of the front beam end and the rear beam end of the precast beam.
The construction method of the prefabricated T-beam integral pre-buried guardrail steel bar based on the prefabricated T-beam integral pre-buried guardrail structure comprises the following steps:
the concrete method for continuously bending and processing the reinforcing steel bars into the guardrail embedded part according to the design requirement comprises the following steps:
1.1, bending from the top end of the steel bar to form a short side section of an inclined section 11;
step 1.2, bending the short edge section to form a long edge section of the inclined section 11, wherein an included angle between the long edge section and the short edge section is 84-86 degrees, and the length of the long edge section is 80-115 cm;
step 1.3, bending the long side section to form a first right-angle side and a second right-angle side which are perpendicular to each other, wherein the length ratio of the first right-angle side to the second right-angle side is 1: 1-1.2, and the length of the first right-angle side is 20-35 cm;
step 1.4, bending the second right-angle edge to form a first fold line segment in the fold line segments 13, wherein the first fold line segment is perpendicular to the second right-angle edge, and the length of the first fold line segment is the same as that of the first right-angle edge;
step 1.5, bending the first broken line segment to form a second broken line segment, wherein the second broken line segment is inclined towards the long side segment, and the included angle between the second broken line segment and the first broken line segment is 45-65 degrees;
and step 1.6, bending the second broken line segment to form a third broken line segment, and finishing the processing of the guardrail embedded part, wherein the third broken line segment and the long side segment have the same inclination direction, the minimum distance between the third broken line segment and the long side segment is 2-5 cm, and the overall height of the guardrail embedded part is 80-150 cm.
Step 2, paving guardrail embedded parts 1 in sequence along the length direction of the T beam away from the middle beam section part of the front beam end and the rear beam end, and then pouring concrete;
in the step 2, the length of the front beam end corresponds to the width of the position of a supporting leg in the bridge girder erection machine; the length of the rear beam end corresponds to the width of the position of a rear anchor supporting leg of the bridge girder erection machine, and meanwhile, the technical personnel in the field design the spacing distance of the guardrail embedded part 1 according to the parameters of the precast beam.
Step 3, additionally arranging a support mechanism on the beam end of the T beam and the diaphragm plate to ensure the integral stability of the beam body;
because guardrail built-in fitting 1 is integrated into one piece, the whole weight of guardrail built-in fitting 1 compares the increase with original design, so in order to ensure the overall stability of T roof beam, strengthen beam-ends and cross slab position support pad in T roof beam prefabrication, stretch-draw, deposit, hoist and mount, transportation, erect the course such as, ensure roof beam body overall stability.
Step 4, increasing the clearance height of the hoisting device to finish hoisting the T-shaped beam;
the guardrail embedded part 1 on the T beam is of an integral structure, so that the height is increased compared with the original design, and in order to ensure the safety and the reliability of the T beam in the conveying process or the hoisting process of the beam lifter, the clearance height of the hoisting device is increased to ensure the safety and the reliability;
t roof beam is when hoist and mount, 1 high influence hoist device of integrated into one piece's guardrail built-in fitting is connected with the cooperation of T roof beam hole of hoist, simultaneously when the T roof beam is installed to the bridging machine, conflict takes place for guardrail built-in fitting 1 can well landing leg and the sideslip nose girder of bridging machine, then only need the front beam end 3m department of T roof beam this moment, landing leg position in the corresponding bridging machine, the back beam end 1m department of T roof beam, it is unchangeable pre-buried to correspond anchor landing leg position department handle hole position behind the bridging machine, perhaps bend the whole embedded steel bar part.
Step 5, heightening the longitudinal slope of the bridge with rear anchor legs of the bridge girder erection machine, disassembling the legs and the runway in the bridge girder erection machine, respectively transferring and moving forwards, and finishing a cross-over process by the bridge girder erection machine, namely finishing the construction of the prefabricated integral T-shaped beam embedded guardrail;
taking a 40mT beam as an example, the height of the beam is 2.5m, the height of the guardrail embedded part 1 is 1.2-1.3 m, and the height is 1.25m, so that the total clearance of the beam body can be calculated to be 2.5m +1.25m which is 3.75 m.
When a 40mT beam is erected for an uphill bridge, the clearance height of the middle support leg is not less than 3.75m +1 m-4.75 m because 40m is 2.5%, wherein 2.5% is a reverse value of the maximum clearance height of the bridge erecting machine, the adjustable range of the front support leg is 4.5m +/-0.8 m-3.7 m/5.3m and is a critical range, the distance between the middle support leg and the reverse support is 20m, the height difference of a longitudinal slope is 0.8m, the clearance of a reserved safety space of an overhead crane is not less than 3.74m +0.8 m-4.85 m, the jacking height of the reverse support hydraulic cylinder is 0.90m and is a critical range, and the height of a lower cushion is 0.3 m.
When a 40mT beam is erected for a downhill bridge, 40m is 1.8 percent and 0.72m is obtained, the clearance height of a middle supporting leg is not lower than 3.75+0.72 and 4.47m is obtained, wherein 1.8 percent is a reverse value of the maximum clearance height of a bridge erecting machine, the adjustable range of the middle supporting leg is 3.6m +/-0.72 m and 2.88m/4.32m and is a critical range, wherein 3.6m is the maximum height of a supporting leg structure in the bridge erecting machine, 0.72 is additionally heightened difference caused by a longitudinal slope, a sleeper needs to be laid for 30cm, the maximum clearance value of the bridge is 4.47-4.32 and 15cm, and the actual sleeper height value of 30cm is stable, so the sleeper needs to be laid for 30 cm.
The working principle is as follows: a reinforcing steel bar is continuously bent into a guardrail embedded part 1 through a reinforcing steel bar bending device, then the reinforcing steel bar is arranged on two sides of a precast beam along the length direction of the precast beam, the position of the guardrail embedded part 1 is arranged at intervals according to calculation, then a concrete cast-in-place layer is formed by pouring according to requirements, and the integral stability of a beam body is ensured by reinforcing beam ends and cross partition plate position support cushions in the processes of prefabricating, tensioning, storing, hoisting, transporting, erecting and the like of a T beam.
The T roof beam is when installation or hoist and mount, improves hoist device's headroom, with the front beam end 3m department of T roof beam, corresponds landing leg position in the bridge girder erection machine, and the back beam end 1m department of T roof beam corresponds bridge girder erection machine back anchor landing leg position department hoist and mount hole position and pre-buries according to original drawing paper design, perhaps bends full embedded steel bar part, causes the interference when avoiding bridge girder erection machine installation T roof beam.
And finally, when the bridge spanning machine strides, the longitudinal slope of the bridge with the rear anchor support legs is heightened, the middle support legs and the runway are disassembled and respectively transferred and moved forwards, so that the requirement of the bridge spanning machine for striding is met.
Claims (10)
1. A prefabricated T-beam integral pre-buried guardrail structure is characterized by comprising pre-buried guardrails which are arranged on two sides of a prefabricated beam along the length direction of the prefabricated beam; the embedded guardrail comprises guardrail embedded parts (1) which are arranged in parallel and a concrete cast-in-place layer poured on the outer sides of the guardrail embedded parts (1); the guardrail embedded part (1) is connected with a steel bar framework of the precast beam; the guardrail embedded part (1) is of a broken line type structure formed by continuously bending a steel bar into an inclined section (11), a right-angle section (12) and a broken line section (13).
2. The integral pre-buried guardrail structure of the prefabricated T-beam as claimed in claim 1, wherein the right-angle section (12) comprises a first right-angle edge and a second right-angle edge, the bottom of the inclined section (11) is connected with the first right-angle edge, an included angle between the bottom of the inclined section (11) and the vertical direction is 4-6 degrees, and the broken line section (13) comprises a first broken line section vertically connected with the second right-angle edge, a third broken line section inclined in the same direction as the inclined section (11) and a second broken line section connected between the first broken line section and the third broken line section; the inclined section (11), the right-angle section (12) and the broken line section (13) are connected to form a b-shaped structure.
3. The integral pre-buried guardrail structure of the prefabricated T-beam as claimed in claim 2, wherein the ratio of the length of the first right-angle side to the length of the second right-angle side is 1: 1-1.2, and the length of the first right-angle side is 20-35 cm.
4. The integral pre-buried guardrail structure of the prefabricated T-beam as claimed in claim 3, wherein the inclined section (11) comprises a long side section and a short side section with the top of the long side section bent, the long side section is connected with a first right-angle side, the short side section is parallel to a second right-angle side, and the minimum distance between the long side section and a third fold line section is 2-5 cm.
5. The integral pre-buried guardrail structure of the prefabricated T-beam as claimed in any one of claims 1 to 4, wherein the horizontal arrangement distance of the guardrail embedded parts (1) is 10-15 cm, and the total height of the guardrail embedded parts (1) is 80-150 cm.
6. The integral pre-buried guardrail structure of the prefabricated T-beam as claimed in claim 5, wherein the tops of the guardrail embedded parts (1) are connected with each other through steel strands.
7. The integral pre-buried guardrail structure of the prefabricated T-beam as claimed in claim 6, wherein the guardrail embedded parts (1) are arranged on the beam section part between the front beam end and the rear beam end of the prefabricated beam, and the guardrail embedded parts (1) on the two sides of the front beam end and the rear beam end of the prefabricated beam extend to the upper surface of the prefabricated beam or are respectively embedded with partially bent steel bars on the two sides of the front beam end and the rear beam end of the prefabricated beam.
8. The construction method of the integral pre-buried guardrail of the prefabricated T-shaped beam as claimed in claim 7, is characterized by comprising the following steps:
step 1, continuously bending and processing a steel bar into a guardrail embedded part according to design requirements;
step 2, paving guardrail embedded parts (1) in sequence along the length direction of the T beam away from the middle beam section part of the front beam end and the rear beam end, and then pouring concrete;
step 3, additionally arranging a support mechanism on the beam end of the T beam and the diaphragm plate to ensure the integral stability of the beam body;
step 4, increasing the clearance height of the hoisting device to finish hoisting the T-shaped beam;
and 5, heightening the longitudinal slope of the bridge with the rear anchor support legs of the bridge girder erection machine, disassembling the support legs and the runway in the bridge girder erection machine, respectively transferring and advancing, and finishing the cross-span process by the bridge girder spanning machine, namely finishing the construction of the integrally pre-buried guardrail of the prefabricated T-shaped beam.
9. The construction method of the integrally embedded guardrail of the prefabricated T-shaped beam as claimed in claim 8, wherein the length of the front beam end in the step 2 corresponds to the width of the position of a support leg in a bridge girder erection machine; the length of the rear beam end corresponds to the width of the position of the rear anchor supporting leg of the bridge girder erection machine.
10. The construction method of the integrally pre-buried guardrail of the prefabricated T-shaped beam as claimed in claim 8, wherein the concrete method of continuously bending and processing the steel bars into the guardrail pre-buried part according to the design requirement in the step 1 is as follows:
1.1, bending from the top end of a steel bar to form a short side section of an inclined section (11);
step 1.2, bending the short edge section to form a long edge section of the inclined section (11), wherein an included angle between the long edge section and the short edge section is 84-86 degrees, and the length of the long edge section is 80-115 cm;
step 1.3, bending the long side section to form a first right-angle side and a second right-angle side which are perpendicular to each other and are a right-angle section (12), wherein the length ratio of the first right-angle side to the second right-angle side is 1: 1-1.2, and the length of the first right-angle side is 20-35 cm;
step 1.4, bending the second right-angle edge to form a first fold line segment in the fold line segments (13), wherein the first fold line segment is vertical to the second right-angle edge, and the length of the first fold line segment is the same as that of the first right-angle edge;
step 1.5, bending the first broken line segment to form a second broken line segment, wherein the second broken line segment is inclined towards the long side segment, and the included angle between the second broken line segment and the first broken line segment is 45-65 degrees;
and step 1.6, bending the second broken line segment to form a third broken line segment, and finishing the processing of the guardrail embedded part, wherein the third broken line segment and the long side segment have the same inclination direction, the minimum distance between the third broken line segment and the long side segment is 2-5 cm, and the overall height of the guardrail embedded part is 80-150 cm.
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