CN111438816A - Construction method of concrete combined box girder integral prefabricated wall type guardrail - Google Patents

Construction method of concrete combined box girder integral prefabricated wall type guardrail Download PDF

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Publication number
CN111438816A
CN111438816A CN202010230744.8A CN202010230744A CN111438816A CN 111438816 A CN111438816 A CN 111438816A CN 202010230744 A CN202010230744 A CN 202010230744A CN 111438816 A CN111438816 A CN 111438816A
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CN
China
Prior art keywords
guardrail
construction
box girder
counterweight
rigid
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Granted
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CN202010230744.8A
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Chinese (zh)
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CN111438816B (en
Inventor
王贤强
李�昊
张建东
刘朵
李海涛
练强
顾立君
杨羿
冯晓楠
闫畅
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JSTI Group Co Ltd
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JSTI Group Co Ltd
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/245Curing concrete articles
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/10Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
    • E01D19/103Parapets, railings ; Guard barriers or road-bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

Abstract

The invention relates to the technical field of bridge construction, in particular to a construction method of a concrete combined box girder integral prefabricated wall type guardrail, which comprises the following steps: installing a side beam template and binding reinforcing steel bars; arranging embedded parts, and pouring and molding concrete; arranging a temporary support under the side flange plate of the boundary beam guardrail; prefabricating a guardrail; installing a heavy beam; transporting the integral precast box girder to a bridge position for erection, mounting a rigid crossbeam on the rigid crossbeam embedded part, then removing a counterweight girder, and pouring the diaphragm girders and wet joints of the side girders and the middle girders; and after the strength of the diaphragm beam and the wet joint meets the requirement, the rigid cross beam is removed, and the construction of the guardrail is completed. According to the invention, through prefabrication of the boundary beam and the guardrail, the integral prefabrication work of the boundary beam is completed in a factory, and only erection and connection work is needed on site, so that the construction efficiency of the guardrail is improved; through the whole prefabrication of guardrail for the box girder erects the completion back, and the whole linearity of guardrail is more pleasing to the eye, and bulk strength has obtained the assurance.

Description

Construction method of concrete combined box girder integral prefabricated wall type guardrail
Technical Field
The invention relates to the technical field of bridge construction, in particular to a construction method of a concrete combined box girder integral prefabricated wall type guardrail.
Background
The box girder guard rail is a rigid structure which is arranged on two sides of the box girder and used for guaranteeing the passing safety of the bridge. The combined box girder bridge guardrail is constructed in a cast-in-place mode mostly, so that the construction period is long, the procedures are complicated, the influence of adverse conditions of a construction site is obvious, and the appearance quality is difficult to control. At present, with the gradual improvement of the prefabrication and assembly levels of bridge construction, most of domestic concrete combined box girder bridges are constructed in a prefabrication and assembly mode, so that the construction quality can be effectively controlled, and the production efficiency is improved.
In the prior art, the mode of singly prefabricating guardrail sections is adopted for prefabricating the box girder guardrail, namely, after the box girder is built, the guardrail prefabricated in sections is fixed on the flange plates of the boundary beams. However, the general length of this kind of segmental type prefabricated guardrail is shorter, because the manufacturing error and the installation error of segmental type prefabricated guardrail when connecting, has the discrepancy in elevation between the festival, influences the whole linear shape of guardrail, is connected through the built-in fitting mostly between guardrail and the boundary beam moreover, and joint strength has the hidden danger.
In view of the above problems, the designer actively makes research and innovation based on the practical experience and professional knowledge that the engineering of the products is applied for many years, so as to create a construction method of the concrete combined box girder integral prefabricated wall type guardrail, and the construction method is more practical.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the construction method of the concrete combined box girder integral prefabricated wall type guardrail is provided, and the integrity and the construction efficiency of the prefabricated guardrail are improved.
In order to achieve the purpose, the invention adopts the technical scheme that: a construction method of a concrete combined box girder integral prefabricated wall type guardrail comprises the following steps:
installing a side beam template and binding reinforcing steel bars;
embedding a counterweight beam embedded part and a rigid cross beam embedded part on binding steel bars of the side beam, and pouring and forming the side beam;
arranging a temporary support under the side flange plate of the boundary beam guardrail;
prefabricating a guardrail on the flange side of the formed side beam;
mounting a heavy beam on the counterweight beam embedded part;
transporting the integral precast box girder to a bridge position for erection, mounting a rigid cross beam on the rigid cross beam embedded part, then removing a counterweight beam, and pouring edge beams, middle beam diaphragm beams and wet joints;
and after the strength of the diaphragm beam and the wet joint meets the requirement, the rigid cross beam is removed, and the construction of the guardrail is completed.
Furthermore, in the step of installing the side beam template and binding the steel bars, the pre-arching degree value of the bottom die is adjusted according to the self weight of the guardrail so as to ensure that the side beam and the middle beam are consistent in elevation when being connected with the diaphragm beam.
Furthermore, the method also comprises the step of arranging hoisting holes, wherein the counterweight beam embedded parts and the rigid cross beam embedded parts are embedded in the binding steel bars of the boundary beams in the step of embedding, and the hoisting holes are used for hoisting.
Further, in the step of arranging the temporary support under the side flange plate of the boundary beam guardrail, the temporary support is contacted and tightly propped with the outer side of the lower side web plate of the flange plate.
Further, in the step of prefabricating the guardrail on the flange side of the side beam after molding, a broken seam needs to be arranged when the guardrail is prefabricated.
Further, in the step of mounting the counterweight beam on the counterweight beam embedded part, the counterweight beam is equivalent to the torque from the guardrail to the center line of the box beam, the counterweight beam is disconnected at the position of the preset rigid cross beam, and the longitudinal bridge is sectionally configured in the longitudinal direction.
Furthermore, after the step of mounting the counterweight beam on the counterweight beam embedded part, the method also comprises the steps of removing the temporary support and hoisting the box beam to move to a beam storage field.
Further, the rigid cross beam embedded parts are arranged at the junction positions of the cross-section top plates and the webs in midspans, 1/4 midspans and 3/4 midspans, and the rigid cross beams penetrate through the section gaps of the counterweight beams and are bolted and fixed with the rigid cross beam embedded parts.
The invention has the beneficial effects that: according to the invention, through prefabrication of the boundary beam and the guardrail, the integral prefabrication work of the boundary beam is completed in a factory, and only erection and connection work is needed on site, so that the site construction time is greatly shortened, and the construction efficiency of the guardrail is improved; by integrally prefabricating the guardrail, the integral linearity of the guardrail is more attractive after the box girder is erected, and the integral strength is ensured; in addition, through the arrangement of the counterweight beam, the unbalance loading effect of the side beam is avoided in the transportation and erection stages of the box beam, the instability risk caused by integral prefabrication is overcome, and the construction safety is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a construction method of a concrete composite box girder integral prefabricated wall type guardrail in the embodiment of the invention;
FIG. 2 is a schematic view of an integral prefabricated structure of an edge beam and a guardrail in the embodiment of the invention;
FIG. 3 is a schematic diagram illustrating positions of an embedded part of a top plate of a side beam and a hoisting reserved hole in the embodiment of the invention;
FIG. 4 is a schematic structural view of an edge beam addition I-shaped steel counterweight beam according to an embodiment of the invention;
FIG. 5 is a schematic view of the connection constraint of the rigid beam after erection in the embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an embedded part according to an embodiment of the present invention.
Reference numerals: 1-a boundary beam; 2, a guardrail; 3-counterweight beam embedded parts; 4-hoisting the preformed hole; 5-temporary support frame; 6-rigid beam embedded parts; 7-i-steel counterweight beam; 8-a rigid cross beam; 9-a diaphragm beam; 10-wet seaming; 11-embedding bent ribs; 12-a steel backing plate; 13-vertical screw.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In order to solve the problem that the segmented guard rail in the prior art is not attractive as a whole, the inventor tries to perform the integral prefabrication, but finds that after the integral prefabrication, a plurality of problems exist, for example, after the integral prefabrication, the camber of the side beam can be changed, and in the transportation and erection processes, as the guard rail is arranged on one side of the side beam, the transportation can be inclined or even overturned.
The construction method of the concrete combined box girder integral prefabricated wall type guardrail shown in figure 1 comprises the following steps:
s10: installing a side beam bottom die and binding reinforcing steel bars;
s20: embedding a counterweight beam embedded part and a rigid cross beam embedded part on binding steel bars of the side beam, and pouring and forming the side beam;
s30: arranging a temporary support under the side flange plate of the boundary beam guardrail;
s40: prefabricating a guardrail on the flange side of the formed side beam;
s50: mounting a heavy beam on the counterweight beam embedded part;
s60: transporting the integral prefabricated box girder to a bridge position for erection, mounting a rigid cross beam on the rigid cross beam embedded part, then removing a counterweight beam, and pouring edge beams, middle beam diaphragm beams and wet joints;
s70: and after the strength of the diaphragm beam and the wet joint meets the requirement, the rigid cross beam is removed, and the construction of the guardrail is completed.
In the embodiment, the boundary beam and the guardrail are prefabricated, the integral prefabrication work of the boundary beam is completed in a factory, and only the erection and connection work is needed on site, so that the site construction time is greatly shortened, and the construction efficiency of the guardrail is improved; by integrally prefabricating the guardrail, the integral linearity of the guardrail is more attractive after the box girder is erected, and the integral strength is ensured; in addition, through the arrangement of the counterweight beam, the unbalance loading effect of the side beam is avoided in the transportation and erection stages of the box beam, the instability risk caused by the whole prefabrication is overcome, and the construction safety is improved.
In the following part of the embodiment of the present invention, in order to facilitate understanding of the present invention, a detailed embodiment of the present invention is explained in further detail by referring to fig. 2 to 6, and the method for constructing the concrete composite box girder integral prefabricated wall guardrail provided in the embodiment of the present invention specifically includes the following steps:
the method comprises the following steps: installing a side beam bottom die, polishing the bottom die, coating a release agent after the bottom die is processed, and ensuring that the elevation is consistent when the side beam is connected with the middle beam by considering the self-weight pre-camber value A of the guardrail (which is equivalent and reverse to the vertical deformation of the side beam caused by the self-weight of the guardrail) in the elevation of the vertical die. The height of the boundary beam is consistent when the boundary beam is connected with the middle beam through calculation of the self weight and the camber value of the guardrail, and the quality of the bridge is improved.
Step two: binding the edge beam reinforcing steel bars, positioning the corrugated pipe, arranging a rigid cross beam embedded part 6 (the middle beam is arranged at the same position) at the junction positions of cross-section top plates and webs in midspan, 1/4 midspan and 3/4 midspan, arranging a hoisting preformed hole 4 at the top surface position of the outer side of the web to an embedded counterweight beam embedded part 3 along the longitudinal bridge of the flange plate at the inner side of the edge beam bridge. The embedded part is composed of a steel base plate 12, embedded bent ribs 11 and vertical screws 13, as shown in fig. 6, the embedded bent ribs 11 are fixed with binding steel bars, and then the steel base plate 12 is poured in concrete, so that the connection strength of the embedded part is greatly improved. The uniform distribution of the rigid cross beam embedded parts 6 can improve the stress effect of the boundary beam 1 and prevent the phenomena of overturning, cracking and the like of the boundary beam in the building process.
Step three: installing a side beam template, pouring concrete, tensioning the prestressed tendons after the requirement of the age is met, demolding, and then maintaining according to the requirement.
Step four: and arranging a temporary support frame 5 under the side flange plate of the boundary beam guardrail, wherein the temporary support frame is contacted and tightly propped against the lower side of the boundary beam flange plate and the outer side of the web plate. The temporary support frame 5 is of a frame structure formed by welding channel steel, and the middle of the temporary support frame is provided with an inclined strut to enhance the stability of the temporary support frame. Due to the arrangement of the temporary support frame 5, the forming quality of the boundary beam 1 is improved, the supporting effect during the next step of guardrail pouring is facilitated, and the unbalance loading stress of the boundary beam is reduced.
Step five: after the life-span of boundary beam health preserving reaches 28 days, ligature wall formula guardrail reinforcing bar, found the mould and carry out concrete placement, set up the broken joint of about 2cm every 6m to 8m (the reinforcing bar is the same to be broken off and guarantees the concrete protective layer thickness simultaneously), reduce the influence of guardrail prefabrication to the bending resistance cross section inertia square of roof beam body.
Step six: after the guardrail is cured, the I-shaped steel counterweight beam 7 is fastened on the counterweight beam embedded part 3 by using nuts, and the torque from the weight of the counterweight beam to the central line of the box beam is equivalent to the guardrail. The counterweight beam is disconnected at the position of a preset rigid cross beam, and the longitudinal bridge is sectionally configured. And (3) removing the temporary support frame 5, lifting the integral prefabricated box girder out of the pit by adopting a gantry crane in a mode of supporting the bottom of the girder by a steel wire rope pocket, enabling the steel wire rope to penetrate out of the concrete box girder top plate from the lifting preformed hole 4, adopting a rubber sheet corner protector at the contact part of the steel wire rope and the edge angle of the box girder, supporting the integral prefabricated box girder on a sleeper, and placing the sleeper in a girder storage factory. Through the whole prefabrication at the boundary beam, saved the plenty of time of cast guardrail alone on-the-spot, through I-shaped steel counterweight beam 7's setting, the boundary beam does not take place the slope when having ensured hoist and mount, has ensured the product wholeness.
Step seven: transporting the integral precast box girder to the bridge position, erecting an edge girder and a middle girder, fastening a rigid cross girder 8 on the rigid cross girder embedded part 6 by using a high-strength nut, removing an I-shaped steel counterweight girder 7 on the edge girder, and pouring a diaphragm beam 9 and a wet joint 10. As shown in figure 5, the middle beam is also provided with a rigid cross beam embedded part, and the edge beam is prevented from torsional deformation under the unbalanced load action of the guardrail through the connection of the rigid cross beam, so that the reliability of wet joint construction is improved.
Step eight: and after the strength of the diaphragm beam 9 and the wet joint 10 meets the requirement, removing the rigid cross beam 8, repairing the wet joint below the rigid cross beam, and finishing the construction of the concrete combined box beam integral prefabricated guardrail.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. The construction method of the concrete combined box girder integral prefabricated wall type guardrail is characterized by comprising the following steps of:
installing a side beam template and binding reinforcing steel bars;
embedding a counterweight beam embedded part and a rigid cross beam embedded part on binding steel bars of the side beam, and pouring and forming the side beam;
arranging a temporary support under the side flange plate of the boundary beam guardrail;
prefabricating a guardrail on the flange side of the formed side beam;
mounting a heavy beam on the counterweight beam embedded part;
transporting the integral precast box girder to a bridge position for erection, mounting a rigid cross beam on the rigid cross beam embedded part, then removing a counterweight beam, and pouring edge beams, middle beam diaphragm beams and wet joints;
and after the strength of the diaphragm beam and the wet joint meets the requirement, the rigid cross beam is removed, and the construction of the guardrail is completed.
2. The construction method of the concrete composite box girder integrally precast wall type guardrail according to claim 1, wherein in the step of installing the side girder template and binding the steel bars, the pre-arching degree of the bottom mold is adjusted according to the self weight of the guardrail so as to ensure that the side girder and the middle girder are consistent in elevation when being connected with the diaphragm girder.
3. The construction method of the concrete combined box girder integrally prefabricated wall type guardrail according to claim 1, wherein the step of embedding the counterweight beam embedded part and the rigid cross beam embedded part on the binding steel bars of the side beam and pouring and forming the side beam further comprises arranging hoisting holes, wherein the hoisting holes are used for hoisting.
4. The construction method of the concrete composite box girder integrally precast wall type guard rail according to claim 1, wherein the step of arranging the temporary support in the lower side of the side flange plate of the side sill guard rail is performed such that the temporary support is in contact with and abuts against the outer side of the lower side web of the flange plate.
5. The construction method of the concrete composite box girder integrally precast wall type guard rail according to claim 1, wherein in the step of prefabricating the guard rail in the flange side of the side sill after molding, it is necessary to provide a break joint when prefabricating the guard rail.
6. The construction method of the concrete composite box girder integrally precast wall type guardrail according to claim 1, wherein in the step of installing the counterweight beam on the counterweight beam embedded part, the counterweight beam is equivalent to the torque from the guardrail to the center line of the box girder, the counterweight beam is disconnected at the position of the preset rigid cross beam, and the longitudinal bridge is sectionally configured.
7. The construction method of the concrete composite box girder integrally prefabricated wall type guardrail according to claim 6, wherein after the step of installing the counterweight beam on the counterweight beam embedded part, the step of removing the temporary support and hoisting the box girder to move to a beam storage field is further included.
8. The method for constructing the integral precast wall guardrail of the concrete combined box girder as recited in claim 1, wherein the rigid cross beam embedded parts are arranged at the junction positions of the top plate and the web of the midspan, 1/4 midspan and 3/4 midspan sections, and the rigid cross beams pass through the section gaps of the counterweight beams and are bolted and fixed with the rigid cross beam embedded parts.
CN202010230744.8A 2020-03-27 2020-03-27 Construction method of concrete combined box girder integral prefabricated wall type guardrail Active CN111438816B (en)

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CN111844352A (en) * 2020-08-24 2020-10-30 中交二公局第三工程有限公司 Construction process for prefabricating mechanical high-efficiency guardrail

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CN110847031A (en) * 2019-11-28 2020-02-28 北京市政路桥股份有限公司 Movable hanging basket for bridge construction
CN110847041A (en) * 2019-10-31 2020-02-28 上海市政工程设计研究总院(集团)有限公司 Temporary anchoring structure and anchoring method for segmental prefabricated assembled concrete box girder

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KR20130005081A (en) * 2011-07-05 2013-01-15 이호형 Various section box girder and manufacturing method thereof, and bridge construction method using the same
CN204491397U (en) * 2014-12-30 2015-07-22 上海浦东建筑设计研究院有限公司 A kind of Mid and minor spans pretensioned prestressing steel bar concrete has just connect small box girder structure
KR101954155B1 (en) * 2018-06-07 2019-03-05 컨텍이앤씨 주식회사 Bridge with full-deck and protective wall, and construction method for the same
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CN110205929A (en) * 2019-05-20 2019-09-06 浙江交工宏途交通建设有限公司 A kind of precast concrete assembly guardrail and installation method
CN110373987A (en) * 2019-07-24 2019-10-25 重庆交通建设(集团)有限责任公司 A kind of box beam fast installs composite structure and its installation method
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CN110847031A (en) * 2019-11-28 2020-02-28 北京市政路桥股份有限公司 Movable hanging basket for bridge construction

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111844352A (en) * 2020-08-24 2020-10-30 中交二公局第三工程有限公司 Construction process for prefabricating mechanical high-efficiency guardrail

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