CN111270606B - Connecting structure of assembled steel bridge floor concrete anti-collision guardrail and complete construction method thereof - Google Patents
Connecting structure of assembled steel bridge floor concrete anti-collision guardrail and complete construction method thereof Download PDFInfo
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- CN111270606B CN111270606B CN202010086600.XA CN202010086600A CN111270606B CN 111270606 B CN111270606 B CN 111270606B CN 202010086600 A CN202010086600 A CN 202010086600A CN 111270606 B CN111270606 B CN 111270606B
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- 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
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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
- E01D2101/30—Metal
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Abstract
The invention discloses a connecting structure of an assembled steel bridge floor concrete crash barrier and a complete set of construction method thereof, wherein the connecting structure comprises the following components: prefabricating a concrete guardrail; the precast concrete guardrail comprises pre-embedded inverted T-shaped perforated steel plate connecting pieces, pre-embedded angle steels, pre-embedded high-strength bolts, guardrail anti-collision steel bars and a guardrail body, wherein the guardrail anti-collision steel bars, the pre-embedded inverted T-shaped perforated steel plate connecting pieces and the pre-embedded angle steels are connected in a welding mode, and the precast concrete guardrail is precast after the high-strength bolts are pre-embedded; the precast concrete guardrail is reliably connected with the steel bridge deck through the high-strength bolts. The invention solves the problems of large welding residual stress, complex construction procedures and the like in the current steel bridge deck guardrail construction; and provides technical support for the assembling construction of the steel bridge deck concrete guardrail by the proposed complete construction technology.
Description
Technical Field
The invention belongs to the field of bridges, and particularly relates to a connecting structure of a fabricated steel bridge deck concrete crash barrier and a complete construction technology thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The steel bridge has the characteristics of light dead weight, large bearing capacity, high assembly degree, quick construction and the like, and is widely applied to roads and urban bridges. Generally speaking, steel bridge surface crash barriers can be divided into rigid barriers (e.g., concrete barriers) and semi-rigid barriers (e.g., steel barriers). The concrete guardrail has the characteristics of high rigidity, low manufacturing cost and good coordination with the concrete guardrails of adjacent concrete bridges, so that the concrete guardrail occupies a certain proportion in the steel bridge guardrail.
The traditional construction method of the concrete guardrail of the steel bridge deck mainly adopts the construction method that the anti-collision steel bars or embedded parts in the body are directly welded with the steel bridge deck, and then a template is erected and the concrete guardrail is cast in place. However, the inventor finds that: the method carries out a large amount of welding on the steel bridge deck, so that the steel bridge generates larger welding residual stress and residual deformation, the service life of the steel bridge is influenced, the working procedures are more complicated, and the construction progress is delayed.
Disclosure of Invention
In order to overcome the problems, the invention provides a novel connecting structure of a steel bridge deck concrete anti-collision guardrail, aiming at solving the problems of welding residual stress, complicated construction procedures and the like existing in the current steel bridge deck guardrail construction; and provides technical support for the assembling construction of the steel bridge deck concrete guardrail by the proposed complete construction technology.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a connection structure of an assembled steel bridge floor concrete crash barrier, comprising: precast concrete guard rails (guard rails for short); the bottom of the precast concrete guardrail is provided with a pre-buried inverted T-shaped perforated steel plate connecting piece; the embedded reverse T-shaped perforated steel plate connecting piece is connected with the embedded angle steel in a welded mode, a reserved hole is formed in the bottom flange of the embedded reverse T-shaped perforated steel plate connecting piece, and a cushion block is further arranged at the embedded angle steel.
The research of the invention finds that: the high-strength bolt connection is adopted to replace welding connection, so that the welding residual stress and the residual deformation can be avoided, and the service life of the steel bridge is prolonged; but also has the problems of complex assembly and difficult hoisting. Therefore, the groove is formed in the corner of the precast concrete guardrail, the cushion block is additionally arranged, and the support effect of the cushion block is utilized, so that the precast concrete guardrail can be vertically placed and is convenient to transport and install, the overhanging screw rod of the high-strength bolt can be protected, and collision is avoided; on the other hand, the cushion block is provided with a round angle, and a high-strength steel wire penetrates through the round angle, so that the cushion block is easy to hoist and convenient to disassemble and install; the problems that when the precast concrete guardrail is connected with a steel bridge deck through the high-strength bolt, the installation is inconvenient, and the overhanging screw rod of the high-strength bolt is easy to collide and damage are effectively solved. As shown in fig. 9.
In some embodiments, the embedded high-strength bolt penetrates through the preformed hole on the bottom flange of the embedded inverted T-shaped perforated steel plate connecting piece and the corresponding round hole of the steel bridge floor, so that the precast concrete guardrail is effectively connected with the steel bridge floor through the high-strength bolt, the welding influence on the service life of the steel bridge is avoided, and the construction progress is accelerated.
In order to firmly connect the cushion block with the precast concrete guardrail, in some embodiments, the cushion block is fixed by adopting a longitudinal steel bar extending out of the precast concrete guardrail, the longitudinal steel bar can effectively fix the cushion block and can be used as an internal steel bar of a post-pouring part of the guardrail, so that the post-pouring guardrail and the precast concrete guardrail form a whole, and the overall strength of the connection structure is improved.
In some embodiments, in order to further ensure the reliability of the connection between the cushion block and the precast concrete guardrail, an annular clamp may be further disposed at the end of the cushion block, as shown in fig. 2, so as to ensure that the cushion block does not fall off during the hoisting and transportation of the precast concrete guardrail.
In some embodiments, the precast concrete guardrail is provided with first steel bars arranged along the outline of the guardrail, second steel bars arranged obliquely, third steel bars penetrating through corresponding holes of the steel plates with the holes on the inner side and the outer side, and longitudinal fourth steel bars and longitudinal fifth steel bars arranged along the height of the guardrail, so that the overall strength of the guardrail is improved. The first steel bar extends downwards along the outline of the guardrail and is welded with the bottom flange of the embedded inverted T-shaped perforated steel plate connecting piece at the two sides after being bent in opposite directions at the bottom of the guardrail. And the second steel bar is bent after being welded with the bottom flange of the inner side embedded inverted T-shaped perforated steel plate connecting piece, extends upwards in an inclined mode until the second steel bar is intersected with the first steel bar, and then is bound with the first steel bar. And the third steel bar penetrates through the corresponding holes of the steel plates with the holes in the inner side and the outer side at the bottom of the guardrail. Vertical fourth reinforcing bar is along guardrail highly uniform, and length equals guardrail prefabricated length. And the longitudinal fifth steel bar is arranged on the lower part of the guardrail and penetrates through the circular hole of the embedded angle steel to extend out of the prefabricated guardrail body. As shown in fig. 1 and 4. Adopt the precast concrete guardrail and the high strength bolt cooperation of above-mentioned structure, can adjust the joint strength of steel bridge floor and precast concrete guardrail through the range form of high strength bolt, the adjustment of range interval to satisfy the assembly requirement of different operating modes, the practicality is strong.
The research of the invention finds that: the connecting structure of the assembled steel bridge floor concrete crash barrier has a plurality of technical problems to be solved in the implementation process: firstly, the screw rod of the high-strength bolt extends out of the bottom of the guardrail, so that the high-strength bolt is easy to collide and damage, and the storage and transportation of the guardrail are inconvenient, so that a key problem is how to protect the extending screw rod from collision; secondly, the dense round holes of the steel bridge deck bring inconvenience to the laying of the bridge deck leveling layer, and a new technology is required to be developed so that slurry is not leaked and the round holes are not blocked when the leveling layer is laid; ensuring the high-strength bolt to be prevented from being soaked and corroded is another key problem; how to simplify the lifting and installation of the guardrail sections to the maximum extent is another technical problem to be solved.
Therefore, the invention also provides a complete construction method of the assembled steel bridge floor concrete crash barrier, which comprises the following steps:
1) determining the length of the precast concrete guardrail section according to the transportation and hoisting capacity of a construction site;
2) welding first steel bars of the precast concrete guardrail with bottom flanges of embedded inverted T-shaped perforated steel plate connecting pieces arranged on the inner side and the outer side; welding a second steel bar of the precast concrete guardrail with the bottom flange of the embedded inverted T-shaped perforated steel plate connecting piece at the inner side, bending, extending obliquely upwards until the second steel bar is intersected with the first steel bar, and then binding the second steel bar with the first steel bar; arranging a longitudinal fourth reinforcing steel bar and a longitudinal fifth reinforcing steel bar;
3) pre-buried angle steel is arranged at the corner of the precast concrete guardrail section and is welded with the pre-buried inverted T-shaped perforated steel plate connecting piece; the first steel bar and the second steel bar are welded with the embedded angle steel at the end part of the prefabricated section; the longitudinal fifth steel bar penetrates through the circular hole of the embedded angle steel and extends out of the precast concrete guardrail;
4) inserting the embedded high-strength bolt and the third steel bar into the corresponding round hole;
5) setting a cushion block with a round hole at the corner of the precast concrete guardrail, wherein the cushion block can be sleeved on a fifth longitudinal steel bar and is fixed by an annular clamp;
6) pouring the concrete anti-collision guardrail, and prefabricating sections;
7) a round hole is formed in the corresponding position of the steel bridge deck, a rubber ring is pasted on the round hole, and then a high-strength mortar leveling layer is paved on the steel bridge deck within the range of the guardrail; the rubber ring ensures that the round hole on the steel bridge surface is not blocked when mortar is laid, and can be sleeved outside the high-strength bolt screw after the guardrail is installed to seal the screw, thereby playing the roles of preventing water immersion and rust corrosion.
8) When the guardrail is hoisted, the high-strength steel wire penetrates into round holes at the corners of the prefabricated sections and is anchored into a ring, and the high-strength steel wire on the two sides of the guardrail sections is hoisted and installed;
9) hoisting the precast concrete guardrail and the cushion block to the installation position, and performing early centering; after centering, removing the cushion block and installing the guardrail; after the pre-embedded high-strength bolt is accurately inserted into the corresponding hole of the steel bridge deck, screwing the high-strength bolt;
10) and pouring and sealing the pre-opened notches at the corners of the prefabricated sections and the installation seams among the sections by using high-strength mortar.
The steel bridge deck concrete guardrail connected through the high-strength bolts can effectively solve the problems by adopting a prefabricated assembly construction technology, and provides technical support for the assembly construction of the steel bridge deck concrete guardrail.
The invention has the beneficial effects that:
(1) the steel bridge deck does not have any welding operation in the construction process of the guardrail, so that the universal welding residual stress and residual deformation of the steel bridge deck are avoided, the stress of the cross section is improved, and the service life of the steel bridge deck is prolonged;
(2) the guardrail adopts a prefabricated assembly construction process, so that the construction is simplified, the construction period can be effectively shortened, and the construction cost is reduced;
(3) when the guardrail is damaged due to factors such as vehicle collision, the damaged sections can be maintained and replaced, and the guardrail is convenient, quick, economical and environment-friendly.
(4) The proposed complete construction technology is simple, convenient, safe and reliable, and can provide effective technical support for the connection structure.
(5) The method has the advantages of simple operation method, low cost, universality and easy large-scale production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, 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 a prefabricated section of a fabricated steel deck concrete crash barrier according to embodiment 1 of the present invention.
Fig. 2 is a schematic view of a prefabricated section (only part of embedded parts are shown) of the assembled steel deck concrete crash barrier in the embodiment 1 of the invention.
Fig. 3 is a schematic view of a fabricated steel deck concrete crash barrier head block in embodiment 1 of the present invention.
Fig. 4 is a schematic view of the connection between the assembled steel deck concrete crash barrier and the steel deck in embodiment 1 of the invention.
Fig. 5 is a schematic view of connection between the crash-proof steel bars of the guardrail and the pre-buried inverted T-shaped perforated steel plate connector in embodiment 1 of the invention.
Fig. 6 is a sectional view taken along line a-a of fig. 4 in example 1 of the present invention.
Fig. 7 is a sectional view B-B of fig. 4 in embodiment 1 of the present invention.
Fig. 8 is a cross-sectional view of C-C of fig. 5 in embodiment 1 of the present invention.
Fig. 9 is a schematic longitudinal sectional view of the guardrail during hoisting in embodiment 1 of the invention.
The steel bridge deck comprises a steel bridge deck top plate 1, a longitudinal stiffening rib 2, a transverse stiffening rib 3, a side sealing plate 4, a first anti-collision guardrail steel bar 5, a second anti-collision guardrail steel bar 6, a third anti-collision guardrail steel bar 7, a longitudinal fourth steel bar 8, a longitudinal fifth steel bar 9, a pre-embedded inverted T-shaped perforated steel plate connecting piece 10, a pre-embedded high-strength bolt 11, pre-embedded angle steel 12, a cushion block 13, a high-strength steel wire 14 and an annular clamp 15.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background art, the concrete crash barrier welded on the steel bridge deck at present has the problems of residual stress and residual deformation, influence on the service life of the steel bridge, complex working procedures and delay of the construction progress. Therefore, the invention provides a connection structure of an assembly type steel bridge floor concrete crash barrier, which comprises an embedded inverted T-shaped perforated steel plate connecting piece, an embedded high-strength bolt, embedded angle steel, a guardrail crash reinforcement and a precast concrete guardrail. Before concrete pouring, welding guardrail anti-collision steel bars with pre-embedded inverted T-shaped perforated steel plate connecting pieces and pre-embedded angle steels, and pre-embedding high-strength bolts; the corner of the guardrail is pre-notched, and is provided with a cushion block, and the cushion block is fixed through a longitudinal steel bar extending out of the precast concrete guardrail, so that the guardrail can be stored and the pre-buried high-strength bolt can be protected. And a round hole is formed in the corresponding position of the steel bridge deck, a rubber ring is pasted at the round hole, and then a high-strength mortar leveling layer is laid. After the guardrail is hoisted and centered, the cushion blocks are disassembled, so that the high-strength bolts are accurately inserted into the corresponding round holes of the steel bridge deck, and then the high-strength bolts are screwed down to realize the reliable connection of the precast concrete crash barrier and the steel bridge deck.
It should be noted that, in the present application, "high strength steel wire", "high strength mortar" and "high strength bolt" are all concepts or terms known in the art, and there are clear definitions and standards in the art, and when in use, a person skilled in the art can make routine selections according to actual working conditions.
Furthermore, the connecting structure of the assembly type steel bridge floor concrete anti-collision guardrail is characterized in that first reinforcing steel bars arranged along the outline of the guardrail, second reinforcing steel bars arranged obliquely, third reinforcing steel bars penetrating through corresponding holes of the steel plates with the holes in the inner side and the outer side, pre-embedded high-strength bolts and pre-embedded angle steel at the corners of the prefabricated sections are arranged in the concrete anti-collision guardrail. The first steel bar extends downwards along the outline of the guardrail and is welded with the bottom flange of the embedded inverted T-shaped perforated steel plate connecting piece at the two sides after being bent in opposite directions at the bottom of the guardrail. And the second steel bar is bent after being welded with the bottom flange of the inner side embedded inverted T-shaped perforated steel plate connecting piece, extends upwards in an inclined mode until the second steel bar is intersected with the first steel bar, and then is bound with the first steel bar. And the third steel bar penetrates through the corresponding holes of the steel plates with the holes in the inner side and the outer side at the bottom of the guardrail. Vertical fourth reinforcing bar is along guardrail highly uniform, and length equals guardrail prefabricated length. And the longitudinal fifth steel bar is arranged on the lower part of the guardrail and penetrates through the circular hole of the embedded angle steel to extend out of the precast concrete guardrail. The embedded angle steel is positioned at the corner of the precast concrete guardrail section and is welded with an embedded inverted T-shaped perforated steel plate connecting piece; the first steel bar and the second steel bar are welded with the embedded angle steel at the end part according to the arrangement mode of other positions. And the embedded high-strength bolt is inserted into an opening of the bottom flange of the embedded inverted T-shaped opening steel plate connecting piece.
Furthermore, the connection structure of the assembly type steel bridge surface concrete crash barrier is characterized in that the steel bridge surface is an orthotropic plate structure consisting of a steel bridge surface top plate, longitudinal stiffening ribs and transverse stiffening ribs.
Furthermore, pre-buried type of falling T trompil steel sheet connecting piece, the connecting piece bottom flange flushes with the guardrail bottom surface, trompil steel sheet perpendicular to connecting piece bottom flange to carry out the double-sided fillet weld with it and be connected. The perforated steel plate is longitudinally provided with a plurality of round holes at equal intervals, the interval between every two adjacent round holes is 10-20 cm, and the diameter of each round hole is 6-8 cm. The pre-buried type of falling T trompil steel sheet connecting piece bottom flange is provided with the preformed hole, the high strength bolt passes the preformed hole and carries out pre-buried.
Furthermore, the precast concrete guardrail is of a reinforced concrete structure consisting of concrete and guardrail anti-collision steel bars.
In order to achieve the purpose, the invention provides a complete construction technology for providing technical support for the assembly construction of the steel bridge deck concrete guardrail, and the complete construction technology comprises the following steps:
(1) the length of the precast concrete guardrail sections is determined according to the transportation and hoisting capacity of a construction site, the length is generally 2-3 m, and installation seams of 2cm are reserved among the precast sections.
(2) And welding the first steel bar of the precast concrete guardrail with the bottom flange of the embedded inverted T-shaped perforated steel plate connecting piece arranged on the inner side and the outer side. And (3) welding the second steel bar of the precast concrete guardrail and the bottom flange of the inner side embedded inverted T-shaped perforated steel plate connecting piece, bending, extending obliquely upwards until the second steel bar is intersected with the first steel bar, and binding the second steel bar with the first steel bar. The fourth longitudinal reinforcement and the fifth longitudinal reinforcement are arranged according to fig. 4.
(3) Pre-buried angle steel is arranged at the corner of the precast concrete guardrail section and is welded with the pre-buried inverted T-shaped perforated steel plate connecting piece; the first steel bars and the second steel bars are welded with the embedded angle steel at the end of the prefabricated section according to the arrangement mode of other positions; and the longitudinal fifth steel bar penetrates through the circular hole of the embedded angle steel and extends out of the precast concrete guardrail.
(4) And inserting the pre-buried high-strength bolt and the third steel bar into the corresponding round hole.
(5) And a cushion block is arranged at the position of the pre-groove of the precast concrete guardrail, and the cushion block is sleeved on a longitudinal fifth steel bar extending out of the guardrail and can be fixed by an annular clamp. The cushion block is easy and convenient to disassemble and assemble, low in manufacturing cost and capable of effectively solving the technical problem by matching with the high-strength steel wire.
Preferably, the cushion block is 3-5 cm higher than the end part of the embedded bolt, so that the prefabricated concrete guardrail can be stored and hoisted conveniently, further, the embedded high-strength bolt at the bottom of the guardrail can be protected, and the technical problem is solved effectively.
(6) And pouring the concrete anti-collision guardrail, and prefabricating the segments.
(7) And a round hole is formed in the corresponding position of the steel bridge deck, a rubber ring is pasted at the round hole, the inner diameter of the rubber ring is the same as that of the round hole, the thickness of the rubber ring is 1cm, and then a high-strength mortar leveling layer with the thickness of 1cm is paved on the steel bridge deck within the range of the guardrail. The rubber ring has the leakproofness, can prevent that moisture from invading high strength bolt, reduces the bolt corrosion risk, effectively solves aforementioned technical problem thirdly. Meanwhile, the rubber ring can be used as a 'template' for laying a leveling layer, and the technical problem II is effectively solved.
(8) When the guardrail is hoisted, the high-strength steel wire penetrates into the round hole at the corner of the prefabricated section, and is anchored into a ring, and the high-strength steel wire on the two sides of the guardrail section is hoisted and installed.
(9) And hoisting the precast concrete guardrail (including the cushion block) to the installation position, and performing early centering. And after centering, removing the cushion blocks and installing the guardrails. After the pre-buried high-strength bolt is accurately inserted into the corresponding hole of the steel bridge deck, the high-strength bolt is screwed, and then the concrete crash barrier can be reliably connected with the steel bridge deck.
(10) Pouring and sealing the pre-opened groove of the prefabricated segment and the mounting joint between the segments by using high-strength mortar, preferably, the longitudinal fifth steel bar extending out of the prefabricated concrete guardrail can be used as an internal steel bar of post-pouring high-strength mortar.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1:
referring to fig. 1 to 9, reference numerals 1 to 15 in the drawings are: the concrete guardrail comprises 1-steel bridge deck top plate, 2-longitudinal stiffening ribs, 3-transverse stiffening ribs, 4-side sealing plates, 5-precast concrete guardrail first reinforcing steel bars, 6-precast concrete guardrail second reinforcing steel bars, 7-precast concrete guardrail third reinforcing steel bars, 8-longitudinal fourth reinforcing steel bars, 9-longitudinal fifth reinforcing steel bars, 10-embedded inverted T-shaped perforated steel plate connecting pieces, 11-embedded high-strength bolts, 12-embedded angle steel, 13-cushion blocks, 14-high-strength steel wires and 15-annular clamps.
As shown in fig. 4, the present embodiment provides a coupling structure of an assembly type steel deck concrete crash barrier. The steel bridge deck is composed of a steel bridge deck top plate 1, longitudinal stiffening ribs 2, transverse stiffening ribs 3 and side sealing plates 4. The concrete crash barrier includes sets up the first reinforcing bar of a plurality of groups precast concrete guardrail 5, precast concrete guardrail second reinforcing bar 6, precast concrete guardrail third reinforcing bar 7, along vertical fourth reinforcing bar 8, vertical fifth reinforcing bar 9 and pre-buried type of falling T trompil steel sheet connecting piece 10 that guardrail height evenly arranged, set up in the pre-buried angle steel 12 of prefabricated segment corner department along guardrail length direction.
As shown in fig. 4 to 9, the precast concrete guardrail first steel bar 5 extends downwards along the outline of the guardrail, and is bent oppositely at the bottom of the guardrail and then is welded with the bottom flange of the embedded inverted T-shaped perforated steel plate connecting piece 10 at two sides by double-sided fillet welding. And the second steel bars 6 of the precast concrete guardrail and the bottom flange of the inner side embedded inverted T-shaped perforated steel plate connecting piece 10 are welded by a double-sided fillet weld, and then are bent upwards in an inclined manner and extended until being intersected with the first steel bars 5 of the precast concrete guardrail, and then are bound with the first steel bars 5 of the precast concrete guardrail. The precast concrete guardrail third reinforcing steel bar 7 runs through the corresponding holes of the inner and outer side perforated steel plates at the bottom of the guardrail. The longitudinal fourth reinforcement 8 and the longitudinal fifth reinforcement 9 are arranged according to fig. 4. Pre-buried angle steel 12 is arranged at the corner of the precast concrete guardrail section and is welded with a pre-buried inverted T-shaped perforated steel plate connecting piece 10; the first steel bars 5 and the second steel bars 6 are welded with the embedded angle steel 12 at the ends of the segments according to the arrangement mode of other positions. And the longitudinal fifth reinforcing steel bars 9 penetrate through the round holes of the embedded angle steels 12 and extend out of the precast concrete guardrail, as shown in figure 1. The embedded high-strength bolt 11 is inserted into the opening of the bottom flange of the embedded inverted T-shaped opening steel plate connecting piece 10.
And a cushion block 13 with a round hole is arranged at the position of the pre-groove of the precast concrete guardrail, the longitudinal fifth steel bar 9 can be sleeved in the cushion block 13, and the cushion block is fixed through an annular clamp 15. Preferably, the cushion block can be of a wood structure and is 3-5 cm higher than the embedded bolts, a round angle is formed at the position, close to the embedded angle steel 12, of the cushion block, and the cushion block 13 can serve as a protection device for the high-strength bolts 11 in the storage and transportation processes, as shown in fig. 2 and 3.
And pouring the concrete anti-collision guardrail, and prefabricating the segments.
And (3) sticking a rubber ring to the opening of the steel bridge deck, wherein the inner diameter of the rubber ring is the same as that of the opening of the steel bridge deck, and the height of the rubber ring is 1 cm. And after the pasting, paving a high-strength mortar leveling layer with the thickness of 1cm in the range of the steel bridge surface guardrail.
And (3) penetrating the high-strength steel wire 14 into round holes at the corners of the prefabricated sections, anchoring the high-strength steel wire into a ring, and preparing for hoisting.
And hoisting the precast concrete guardrail (comprising the cushion block 13) to the installation position, and performing early centering. After centering, the ring clamp 15 and spacer 13 are removed. After the pre-embedded high-strength bolt 11 is accurately inserted into the corresponding hole of the steel bridge deck, the high-strength bolt is screwed, and then the concrete crash barrier can be reliably connected with the steel bridge deck.
And (4) dismantling the high-strength steel wires 14, and pouring and sealing the pre-grooved openings at the corners of the prefabricated sections and the installation seams among the sections by using high-strength mortar. Preferably, the longitudinal fifth steel bar 9 protruding from the precast concrete guard rail at this time can be used as an internal rib of high-strength mortar.
The invention is characterized in that: the steel bridge deck is free of any welding operation in the guardrail construction process, so that the universal welding residual stress and residual deformation of the steel bridge deck are avoided, the stress of the cross section is improved, and the service life of the steel bridge deck is prolonged; secondly, the guardrail adopts a prefabricated assembly construction process, so that the construction is simplified, the construction period can be effectively shortened, and the construction cost is reduced; when the guardrail is damaged due to factors such as vehicle collision, the damaged segments can be maintained and replaced, and the guardrail is convenient, quick, economical and environment-friendly. The complete construction technology is simple, convenient, feasible, safe and reliable, and can provide effective technical support for the connection structure.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. A complete construction method of an assembled steel bridge floor concrete crash barrier is characterized by comprising the following steps:
assembled steel bridge floor concrete crash barrier includes: prefabricating a concrete guardrail; the bottom of the precast concrete guardrail is provided with a pre-buried inverted T-shaped perforated steel plate connecting piece; the embedded inverted T-shaped perforated steel plate connecting piece is welded with embedded angle steel, a reserved hole is formed in the bottom flange of the embedded inverted T-shaped perforated steel plate connecting piece, and a cushion block is further arranged at the embedded angle steel;
the embedded high-strength bolt penetrates through a preformed hole in the bottom flange of the embedded inverted T-shaped perforated steel plate connecting piece and a corresponding round hole in the steel bridge deck;
the precast concrete guardrail is provided with first steel bars arranged along the outline of the guardrail, second steel bars arranged obliquely, third steel bars penetrating through holes corresponding to the steel plates with holes on the inner side and the outer side, and longitudinal fourth steel bars and longitudinal fifth steel bars arranged along the height of the guardrail;
the method comprises the following steps:
1) determining the length of the precast concrete guardrail section according to the transportation and hoisting capacity of a construction site;
2) welding first steel bars of the precast concrete guardrail with bottom flanges of embedded inverted T-shaped perforated steel plate connecting pieces arranged on the inner side and the outer side; welding a second steel bar of the precast concrete guardrail with the bottom flange of the embedded inverted T-shaped perforated steel plate connecting piece at the inner side, bending, extending obliquely upwards until the second steel bar is intersected with the first steel bar, and then binding the second steel bar with the first steel bar; arranging a longitudinal fourth reinforcing steel bar and a longitudinal fifth reinforcing steel bar;
3) pre-buried angle steel is arranged at the corner of the precast concrete guardrail section and is welded with the pre-buried inverted T-shaped perforated steel plate connecting piece; the first steel bar and the second steel bar are welded with the embedded angle steel at the end part of the prefabricated section; the longitudinal fifth steel bar penetrates through the circular hole of the embedded angle steel and extends out of the precast concrete guardrail;
4) inserting the embedded high-strength bolt and the third steel bar into the corresponding round hole;
5) setting a cushion block with a round hole at the corner of the precast concrete guardrail, wherein the cushion block can be sleeved on a fifth longitudinal steel bar and is fixed by an annular clamp;
6) pouring the concrete anti-collision guardrail, and prefabricating sections;
7) a round hole is formed in the corresponding position of the steel bridge deck, a rubber ring is pasted on the round hole, and then a high-strength mortar leveling layer is paved on the steel bridge deck within the range of the guardrail;
8) when the guardrail is hoisted, the high-strength steel wire penetrates into round holes at the corners of the prefabricated sections and is anchored into a ring, and the high-strength steel wire on the two sides of the guardrail sections is hoisted and installed;
9) hoisting the precast concrete guardrail and the cushion block to the installation position, and performing early centering; after centering, removing the cushion block and installing the guardrail; after the pre-embedded high-strength bolt is accurately inserted into the corresponding hole of the steel bridge deck, screwing the high-strength bolt;
10) and pouring and sealing the pre-opened notches at the corners of the prefabricated sections and the installation seams among the sections by using high-strength mortar.
2. The method of constructing a modular steel deck concrete crash barrier of claim 1, wherein said spacer blocks are secured by longitudinal reinforcement extending from said precast concrete barrier.
3. The complete construction method of the fabricated steel bridge floor concrete crash barrier as recited in claim 1, wherein the first steel bars extend downwards along the outer contour of the crash barrier and are welded to the bottom flanges of the embedded inverted T-shaped steel plate connectors at both sides after the bottom of the crash barrier is bent towards each other.
4. The complete construction method of the assembled steel bridge deck concrete crash barrier according to claim 1, wherein the second steel bars are welded to the bottom flange of the inner embedded inverted T-shaped open-cell steel plate connecting member, bent, and extended obliquely upward until intersecting the first steel bars, and then bound with the first steel bars.
5. The method for constructing an assembled steel bridge floor concrete crash barrier according to claim 1, wherein the third reinforcing steel bars are perforated at the bottom of the crash barrier through corresponding holes on the inner and outer sides of the steel plate.
6. The method of claim 1, wherein the longitudinal fourth reinforcing bars are uniformly distributed along the height of the guardrail and have a length equal to the prefabricated length of the guardrail.
7. The complete construction method of the fabricated steel bridge deck concrete crash barrier according to claim 1, wherein the longitudinal fifth steel bars are arranged at the lower part of the crash barrier and extend out of the precast concrete crash barrier through the circular holes of the embedded angle steels.
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| CN111576251B (en) * | 2020-06-16 | 2021-09-21 | 中国铁路设计集团有限公司 | Construction method for on-site assembly of integral bridge deck system |
| CN112095460A (en) * | 2020-08-17 | 2020-12-18 | 上海市政工程设计研究总院（集团）有限公司 | Transition section connecting structure for connecting metal beam column type guardrail and concrete guardrail |
| CN112161514A (en) * | 2020-09-02 | 2021-01-01 | 南京理工大学 | A interior lining steel sheet subassembly for water target way bottom plate |
| CN112281654B (en) * | 2020-11-05 | 2024-06-25 | 安徽省公路桥梁工程有限公司 | Semi-assembled steel skeleton bridge anti-collision guardrail and construction method thereof |
| CN112538823A (en) * | 2020-12-05 | 2021-03-23 | 中铁十九局集团第一工程有限公司 | Construction method for mounting precast block of precast concrete protective wall |
| CN114032770A (en) * | 2021-10-20 | 2022-02-11 | 中国建筑第七工程局有限公司 | Construction method of cast-in-place concrete anti-collision guardrail for expressway bridge in earthquake-prone area |
| CN114164756A (en) * | 2021-12-22 | 2022-03-11 | 武汉理工大学 | Light high-strength assembly type bridge anti-collision guardrail |
| CN114411564A (en) * | 2022-02-25 | 2022-04-29 | 中交一公局第二工程有限公司 | Novel guardrail steel bar installation device and construction method |
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