CN212247899U - Construction system for cast-in-place box girder at excavation section of existing line bridge-changing section in active service - Google Patents
Construction system for cast-in-place box girder at excavation section of existing line bridge-changing section in active service Download PDFInfo
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Abstract
The utility model provides an active service existing line bridge-changing excavation section cast-in-place box girder construction system, wherein a stand column of a stand column pre-isolation structure is pre-embedded in the backfill soil of a foundation; the foam light soil pipe is positioned and sleeved on the upright post; a tie beam side die and a tie beam bottom die of the tie beam supporting structure are positioned at the outer side of the tie beam; the tie beam side forms are arranged between the upright posts, and two ends of the tie beam side forms are respectively connected with the upright posts; the tie beam bottom die is positioned and supported through a low bracket and used for realizing the positioning arrangement of the tie beam; the lower part of the outer side die of the box girder template structure is positioned and arranged on the bottom die of the box girder through a support frame, and the upper part is positioned and arranged through a pull rod assembly; the box girder inner side die is positioned in the box girder outer side die. The utility model discloses a set up stand isolation structure, tie beam bearing structure and case roof beam template structure in advance, realized not needing to carry out full hall support and set up and demolish its construction support template that corresponds, labour saving and time saving has more reduced the time limit for a project greatly, and economical and practical is fit for extensively promoting.
Description
Technical Field
The utility model relates to a cast-in-place box girder construction technical field of bridge, concretely relates to existing circuit of labour changes the cast-in-place box girder construction system of bridge excavation section.
Background
With the continuous development of Chinese economy, the infrastructure of each large city is also continuously carried out, new planned roads are prepared for construction almost every day, the new planned roads must intersect with a plurality of existing roads, and at the moment, two options are generally available, namely underpass and overpass. When the planned road is a downward crossing road, the old road with crossing is changed into a bridge. Because of the short construction period and the limited construction site of the underpass road engineering, cast-in-place box girders are generally adopted, and the construction process is generally full framing.
In the construction, due to the elevation factor of the bridge, the consumption of erecting and dismantling the construction support templates of the full-scale support is large, the construction period is long, the limitation on the mountainous bridges and high piers is large, and a large amount of manpower, working hours and construction cost are consumed. In addition, when the existing active route is expanded and constructed and the road is reconstructed into a lower crossing road according to special construction requirements, active traffic, construction period and safety problems need to be considered.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an existing circuit of active service changes the cast-in-place case roof beam construction system of bridge excavation section, aim at solving in the existing highway of active service widens the operation, full hall support is set up and is demolishd construction support template consumption and big, the period is long, the technical problem who wastes time and energy.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
the existing line of active service changes the bridge and excavates the cast-in-place case roof beam construction system of section, including the pillar is isolated structure in advance, tie beam bearing structure and case roof beam template structure;
the upright post pre-isolation structure comprises an upright post and a foam light soil pipe; the upright posts are pre-buried in the backfill soil of the foundation; the foam light soil pipe is sleeved on the upright post in a positioning way;
the tie beam supporting structure comprises a tie beam, a tie beam side die and a tie beam bottom die; the tie beam side die and the tie beam bottom die are positioned at the outer side of the tie beam; the tie beam side die is arranged between the upright posts, and two ends of the tie beam side die are respectively connected with the upright posts; the tie beam bottom die is positioned and supported through a low support and used for realizing positioning arrangement of the tie beam;
the box girder template structure comprises a box girder bottom template, a box girder outer side template and a box girder inner side template; the lower part of the outer side die of the box girder is positioned on the bottom die of the box girder through a support frame, and the upper part of the outer side die of the box girder is positioned through a pull rod assembly; the box girder inner side die is positioned in the box girder outer side die.
As a further improvement, the box girder bottom die is a hardening place of the upper surface of the backfill soil.
As a further improvement, the hardened site is smeared epoxy paint after pouring concrete on the backfill soil that is less than the bent cap until the surface flushes with the bent cap.
As a further improvement of the utility model, the foam light soil pipe is coaxially and tightly sleeved outside the upright post; and the foam light soil pipe is filled with filling gravels.
As a further improvement, the tie beam side forms are connected with the hoops arranged on the stand columns through connecting lugs, and the tie beam bottom moulds are supported through the low supports supported on the backfill soil.
As a further improvement of the utility model, the box girder bottom die comprises backfill and epoxy paint; the epoxy paint is smeared on the surface of the concrete on the backfill soil.
As a further improvement of the utility model, a pull rod assembly is arranged at the top between the outer side dies of the box girder, and the top of the outer formwork is fixed through a rotating nut after being limited; a support frame is arranged on the outer side of the lower part of the outer side die of the box girder; the upper part of the inner side die of the box girder is positioned on the outer side die of the box girder through a positioning rod; the bottom of the box girder inner side die is positioned and arranged on the bottom of the box girder inner side die through a support frame.
As a further improvement, the box girder bottom die is respectively provided with concrete, a basal plane repairing layer, a primer, an epoxy mortar layer, a putty layer and a finish paint from bottom to top according to the preface.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a set up stand isolation structure, tie beam bearing structure and case roof beam template structure in advance, realized not needing to carry out full hall support and set up and demolish its construction support template that corresponds, labour saving and time saving has more reduced the time limit for a project greatly, and more economical and practical is fit for extensively promoting.
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 of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the construction of the excavation cast-in-place box girder for improving the existing line in service;
FIG. 2 is a column pre-isolation system of the present invention;
FIG. 3 is a schematic view of the construction of the tie beam of the present invention;
FIG. 4 is a schematic view of the tie beam formwork system of the present invention;
FIG. 5 is a top view of the tie beam formwork hoop of the present invention;
FIG. 6 is a schematic view of the cast-in-place box girder template for bridge-changing excavation of the existing line in active service of the utility model;
FIG. 7 is a schematic structural view of a bottom die of a cast-in-place box girder for bridge-changing and excavation of an existing line in service;
FIG. 8 is a schematic view of the construction process of the excavation cast-in-place box girder for improving the existing line in service;
the reference numbers in the figures illustrate:
1. a column pre-isolation structure; 11. a column; 111. hooping; 12. a foamed lightweight soil pipe; 2. a tie beam support structure; 21. tying a beam; 211. connecting a lifting lug; 22. tying a beam side die; 23. tying a beam bottom die; 24. a low bracket; 3. a box girder template structure; 31. a box girder bottom die; 311. backfilling; 312. epoxy paint; 32. the outer side die of the box girder; 33. an inner side die of the box girder; 34. a support frame; 35. a drawbar assembly; 36. positioning a rod; 37. a limiting rod; 4. a capping beam; 5. and (5) positioning the ribs.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Combine attached drawing 1 to 8, the utility model provides an existing circuit of labour changes bridge excavation section cast-in-place case roof beam construction system aims at solving in the existing highway of labour widens the operation, carries out setting up of full hall support and demolishs the technical problem that wastes time and energy when constructing the support template.
Specifically, the existing line in service bridge-changing excavation section cast-in-place box girder construction system comprises an upright post pre-isolation structure 1, a tie beam support structure 2 and a box girder template structure 3;
the upright post pre-isolation structure 1 comprises upright posts 11 and a foam light soil pipe 12; the upright post 11 is pre-buried in the backfill 311 of the foundation; the foam light soil pipe 12 is sleeved on the upright post 11 in a positioning way;
the tie beam support structure 2 comprises a tie beam 21, a tie beam side die 22 and a tie beam bottom die 23; the tie beam side die 22 and the tie beam bottom die 23 are positioned at the outer side of the tie beam; the tie beam side die 22 is arranged between the upright posts 11, and two ends of the tie beam side die are respectively connected with the upright posts 11; the tie beam bottom die 23 is positioned and supported through a low bracket 24 and used for realizing the positioning arrangement of the tie beam 21;
the box girder template structure 3 comprises a box girder bottom die 31, a box girder outer side die 32 and a box girder inner side die 33; the lower part of the box girder outer side die 32 is positioned and arranged on the box girder bottom die 31 through a support frame 34, and the upper part is positioned and arranged through a pull rod assembly 35; the box girder inner side die 33 is positioned in the box girder outer side die 32.
The utility model discloses a set up stand isolation structure, tie beam bearing structure and case roof beam template structure in advance, realized not needing to carry out full hall support and set up and demolish its construction support template that corresponds, labour saving and time saving has more reduced the time limit for a project greatly, and more economical and practical is fit for extensively promoting.
With reference to fig. 1, the box girder bottom mold 31 is a hardening site on the upper surface of the backfill 311; in the hardening field, after concrete is poured on the backfill soil 311 lower than the cover beam 4, epoxy paint 312 is coated until the surface is flush with the cover beam 4.
With reference to fig. 2, the foamed lightweight soil pipe 12 is coaxially and tightly sleeved outside the upright post 11; and the foam light soil pipe 12 is filled with filling gravels.
With reference to fig. 3, 4 and 5, it should be noted that, when the pre-isolation system of the column 11 is constructed to the designed position of the tie beam, soil is backfilled below the pre-isolation system of the column 11, and the installation and construction of the template system of the tie beam 21 are performed.
Specifically, the tie beam side die 22 is connected with the anchor ear 111 arranged on the upright post 11 through the connecting lug 211, and the tie beam bottom die 23 is supported through the low bracket 24 supported on the backfill soil 311.
With reference to fig. 6, the box girder bottom mold 31 includes backfill 311 and epoxy paint 312; the epoxy paint 312 is coated on the surface of the concrete on the backfill 311.
A pull rod assembly 35 is arranged at the top between the outer side dies 32 of the box girder, and the top of the outer formwork is limited and then fixed through a rotating nut; a support frame 34 is arranged on the outer side of the lower part of the box girder outer side die 32; the upper part of the box girder inner side die 33 is positioned on the box girder outer side die 32 through a positioning rod 36; the bottom of the box girder inner side die 33 is positioned and arranged on the bottom of the box girder inner side die 33 through a support bracket 34.
Referring to fig. 7, specifically, the box girder bottom mold 31 is sequentially provided with 6 layers from bottom to top, which are sequentially concrete, a base surface repairing layer, a primer, an epoxy mortar layer, a putty layer and a finish paint.
With reference to the attached drawing 8, the construction method of the cast-in-place box girder at the excavation section of the existing line bridge-changing excavation section in service comprises the following steps:
s1, construction preparation: preparing materials and equipment required by construction, entering hydropower stations, and leveling the field; before backfilling the foundation pit at the front-stage upright post 11, draining water, airing and solidifying the foundation pit, removing surface floating soil, and ensuring that the bearing capacity of the original ground meets the requirement;
s2, measurement lofting: determining the center of the upright post 11 by using a total station, and popping up an accurate position by using an ink line;
s3, heightening construction of the cast-in-place pile: heightening the sounding pipe before the roadbed is excavated, and bonding a concrete pouring elevation monitoring device on the top of the sounding pipe to accurately control the pouring height;
s4, pouring the upright column: the pouring template of the upright post 11 adopts a large customized steel template, and the periphery of the large customized steel template is tightened and fixed by a guy cable and turnbuckle screws; the concrete is intensively mixed by a mixing station, is pumped into a mould by a delivery pump, is matched by a serial cylinder or a chute during pouring, and is vibrated in layers;
s5, setting a column pre-isolation system: after the concrete pouring of the upright post is finished and the curing is finished for 14 days, pouring a circle of foam lightweight soil pipe 12 with the thickness of 3cm on the periphery of the upright post 11 as a pre-isolation layer of the upright post 11;
s6, backfilling the foundation pit: after the construction of the lower position structure of the upright post 11 is finished, backfilling the foundation pit in layers and rolling and compacting;
s7, pouring the tie beam: installing a template of the tie beam at the design position of the tie beam 21, connecting and positioning the tie beam side molds 22 and the anchor ears 111 of the upright posts 11, supporting the tie beam bottom mold 23 through the low brackets 24, and pouring the tie beam 21 after the template is installed;
s8, backfilling and rolling a foundation pit: backfilling the foundation pit in layers, excavating earth on the roadbed at the bridge span position, excavating to a designed elevation (the bottom of the beam is 12cm), and rolling by adopting a vibration road roller; after the earth excavation and backfilling are close to the designed elevation, the elevation cross slope needs to be accurately controlled, and the elevation of the top surface is ensured to be within the range of +/-2 cm; leveling by using a grader, leveling the compacted box girder bottom die 31 foundation by using a light feeler gauge after a ground is leveled and a rolling structure is leveled;
s9, flattening and hardening the field: after the bearing capacity of the foundation is detected to meet the requirements, performing concrete hardening treatment on the foundation, and leveling the hardening treatment by adopting a triangular vibration beam; mounting a # -shaped positioning rib 5 at the position of the beam surface according to the elevation point, wherein the specification is phi 16, and the reinforcing bars are arranged at intervals of 1 m; in order to ensure the bottom of the supporting rib to be firm, a transverse connecting rib is welded at the bottom of the triangular supporting leg to form a rigid box girder bottom die 31;
s10, surface polishing and epoxy paint coating: after the concrete reaches a certain strength, polishing the surface mortar by using a grinder to expose the cross section of the stone; after the dust is cleaned, the epoxy paint 312 is coated for 4 times in total, the coating effect is realized that the surface is free of bubbles, smooth and complete, and the cast-in-place box girder bottom die 31 is used;
s11, binding steel bars: after the construction of the bottom die 31 of the box girder is finished, the central line axes of each web plate and each cross beam are released, the central line axes are popped up by using ink lines, and the positions of reinforcing steel bars are determined according to the ink lines; binding the reinforcing steel bars is strictly carried out according to construction drawings and specification requirements; the transverse (vertical) steel bars of the top plate, the bottom plate and the web plate of the box girder are welded at intervals of 20cm to form a steel bar mesh so as to facilitate torsion resistance;
s12, mounting prestressed steel strands: strictly executing' web plate bundling first, then top plate bundling and bottom plate bundling; transversely and symmetrically tensioning steel bundles at each part, dividing the tensioning into three stages of pre-arching, mid-arching and post-arching for distinguishing control, and carrying out whole-process observation and monitoring by adopting a total station and a level gauge; simultaneously batching the steel bundles of each part, and waiting for 30 minutes at intervals after each batch of steel bundles are tensioned;
s13, template installation: the assembly type box girder template is arranged on a box girder bottom die 31, the space between two outer box girder dies 32 is controlled by a pull rod assembly 35, the inner box girder die 33 and the outer box girder die 32 are positioned by a positioning rod 36, a bottom plate at the end part of the inner box girder die 33 is fixed with the box girder bottom die 31 in a limiting way by a limiting rod 37, and the outer sides of the outer box girder dies 32 are supported by a supporting frame 34;
s14, pouring concrete: the box girder is poured in multiple times, and a bottom web plate is poured for the first time; pouring from the midspan to the pier top direction during pouring, finally pouring beam sections and transverse partition beams within the range of about 3m on two sides of the pier top, after the first pouring is finished, erecting a top plate template, binding top plate reinforcing steel bars, and pouring residual concrete;
s15, concrete curing: the concrete of the beam body is covered by adopting cotton felt on the surface of the beam body, and the position which cannot be covered is maintained by adopting water spraying;
s16, template removal: when the strength of the beam concrete reaches more than 60% of the design strength, the end mould is dismantled, and the internal mould is loosened; after the prestressed tendons are tensioned, the outer template can be loosened; after grouting is finished and the grouting strength in the pipeline reaches more than 90% of the design strength, the box girder bottom die 31 is removed; when the box girder bottom die 31 is dismantled, the middle span is dismantled firstly, and then the side spans are dismantled; firstly, removing the midspan, then removing the pier, and pushing the bridge to the pier at two sides from the midspan.
Preferably, when the concrete is cured, the concrete is cured once by spraying water at intervals, and the interval time is determined according to the current air temperature.
The device has the advantages of simple structure, convenient installation and operation, economy, practicality, reasonable design, compact structure and good market prospect.
It should be noted that the detailed description of the present invention is not included in the prior art, or can be obtained directly from the market, and those skilled in the art can obtain the detailed description without creative efforts, and the detailed connection method has a very wide application in the field or daily life, and is not described in detail herein.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (8)
1. Existing circuit of labour changes bridge excavation section cast-in-place case roof beam construction system, its characterized in that: the structure comprises an upright post pre-isolation structure, a tie beam supporting structure and a box girder template structure;
the upright post pre-isolation structure comprises an upright post and a foam light soil pipe; the upright posts are pre-buried in the backfill soil of the foundation; the foam light soil pipe is sleeved on the upright post in a positioning way;
the tie beam supporting structure comprises a tie beam, a tie beam side die and a tie beam bottom die; the tie beam side die and the tie beam bottom die are positioned at the outer side of the tie beam; the tie beam side die is arranged between the upright posts, and two ends of the tie beam side die are respectively connected with the upright posts; the tie beam bottom die is positioned and supported through a low support and used for realizing positioning arrangement of the tie beam;
the box girder template structure comprises a box girder bottom template, a box girder outer side template and a box girder inner side template; the lower part of the outer side die of the box girder is positioned on the bottom die of the box girder through a support frame, and the upper part of the outer side die of the box girder is positioned through a pull rod assembly; the box girder inner side die is positioned in the box girder outer side die.
2. The active service existing line bridge-changing excavation section cast-in-place box girder construction system according to claim 1, characterized in that: the box girder bottom die is a hardening field of the upper surface of the backfill soil.
3. The active service existing line bridge-changing excavation section cast-in-place box girder construction system according to claim 2, characterized in that: and in the hardening field, after concrete is poured on the backfill soil lower than the capping beam, epoxy paint is coated until the surface is flush with the capping beam.
4. The active service existing line bridge-changing excavation section cast-in-place box girder construction system according to claim 1, characterized in that: the foamed lightweight soil pipe is coaxially and tightly sleeved on the outer side of the upright post; and the foam light soil pipe is filled with filling gravels.
5. The active service existing line bridge-changing excavation section cast-in-place box girder construction system according to claim 1, characterized in that: the tie beam side die is connected with a hoop arranged on the stand column through a connecting lifting lug, and the tie beam bottom die is supported through a low bracket supported on backfill soil.
6. The active service existing line bridge-changing excavation section cast-in-place box girder construction system according to claim 1, characterized in that: the box girder bottom die comprises backfill and epoxy paint; the epoxy paint is smeared on the surface of the concrete on the backfill soil.
7. The active service existing line bridge-changing excavation section cast-in-place box girder construction system according to claim 1, characterized in that: a pull rod assembly is arranged at the top between the outer side dies of the box girder, and the top of the outer formwork is fixed through a rotating nut after being limited; a support frame is arranged on the outer side of the lower part of the outer side die of the box girder; the upper part of the inner side die of the box girder is positioned on the outer side die of the box girder through a positioning rod; the bottom of the box girder inner side die is positioned and arranged on the bottom of the box girder inner side die through a support frame.
8. The active service existing line bridge-changing excavation section cast-in-place box girder construction system according to claim 1, characterized in that: the box girder bottom die is sequentially provided with concrete, a base surface repairing layer, a primer, an epoxy mortar layer, a putty layer and finish paint from bottom to top.
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| CN113774802A (en) * | 2021-09-17 | 2021-12-10 | 黑龙江省龙建路桥第五工程有限公司 | Cast-in-place box girder edge protection structure and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113774802A (en) * | 2021-09-17 | 2021-12-10 | 黑龙江省龙建路桥第五工程有限公司 | Cast-in-place box girder edge protection structure and construction method |
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