CN110847052A - Porous large-section cast-in-situ box girder and construction method - Google Patents
Porous large-section cast-in-situ box girder and construction method Download PDFInfo
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- CN110847052A CN110847052A CN201911191647.6A CN201911191647A CN110847052A CN 110847052 A CN110847052 A CN 110847052A CN 201911191647 A CN201911191647 A CN 201911191647A CN 110847052 A CN110847052 A CN 110847052A
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- box girder
- support
- foundation
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
Abstract
The invention provides a porous large-section cast-in-situ box girder and a construction method, comprising the following steps of: step one, foundation treatment: excavating steps on the original foundation, adopting a Z-shaped dragging sliding device to carry out mortar plastering construction, and then carrying out foundation construction; step two, erecting a support: after the foundation reaches a certain strength, a bracket system is erected; step three, bottom die installation: mounting a bottom die of the box girder; step four, pre-pressing the bracket: pre-pressing a bracket system by using a water bag; step five, installing an internal mold; constructing a box girder; dismantling the box girder template; and step eight, dismantling the support system, effectively reducing the engineering cost and accelerating the construction speed aiming at the construction method of the porous large-section cast-in-place box girder ultrahigh full-space support system, and obtaining better technical and economic benefits when being applied to actual engineering.
Description
Technical Field
The invention relates to the field of civil engineering, in particular to a porous large-section cast-in-place box girder and a construction method thereof, which are suitable for construction of a porous large-section cast-in-place box girder ultrahigh full-space support system.
Background
With the rapid development of social economy, bridge engineering becomes the key point of attention of people, and at the present stage, the role expression of highway bridges in the social economy development of China is more and more prominent, and the requirements of people on the aspects of style, structure, aesthetic degree and the like of continuous bridges are continuously improved. With the development of scientific technology in China, the construction technology of continuous box girder construction is also changing day by day.
The problems of difficult control of the construction quality of the cast-in-place box girder, poor stability of the support structure, poor integral pre-pressing effect, complex mounting and dismounting procedures of the box girder inner mould and the like easily occur in the construction process of the box girder at the present stage.
Disclosure of Invention
The invention aims to provide a porous large-section cast-in-situ box girder and a construction method aiming at the problem of construction of the porous large-section cast-in-situ box girder, and the requirements of structural construction are met.
A construction method of a porous large-section cast-in-situ box girder mainly comprises the following construction processes:
step one, foundation treatment: excavating steps on an original foundation, performing mortar plastering construction by adopting a Z-shaped dragging sliding device, adjusting the height of the steps to adapt to the different heights by adjusting a height adjusting steel plate and a bolt on an upper cross beam, and then performing foundation construction;
step two, erecting a support: after the foundation reaches a certain strength, erecting a bracket system;
step three, bottom die installation: mounting a bottom die of the box girder, and mounting a bottom film of the box girder on the support system;
step four, pre-pressing the bracket: pre-pressing a bracket system by using a water bag;
step five, internal mold installation: the separated type stereotyped internal molds are connected and fixed through connecting beams and internal mold connecting positioning pins, T-shaped battens are arranged between the separated type stereotyped internal molds for filling, vertical supports are fixed through internal mold internal trusses and bolts to adjust the shapes of the separated type stereotyped internal molds, and the upper parts of the separated type stereotyped internal molds are fixed through compression beams and supporting rods to prevent templates from floating upwards in the concrete pouring process;
step six, box girder construction: binding steel bars of the box girder and pouring concrete, and constructing the box girder on a box girder bottom die;
step seven, dismantling the box girder template: the inner mold dismantling and sizing support is used for dismantling the separated type sizing inner mold, and the geotextile is wrapped outside the upper supporting plate to prevent the poured concrete from being damaged in the dismantling process;
step eight, dismantling a support system: and (5) dismantling the bracket system.
A porous large-section cast-in-situ box girder is prepared according to the construction method of the porous large-section cast-in-situ box girder.
Compared with the prior art, the technical scheme has the following characteristics and beneficial effects:
(1) the step is excavated on the slope foundation, and the strip foundation is arranged on the step to support the lower part of the support, so that the overall stability of the support is improved;
(2) arranging mortar plastering on the slope surface step to prevent the slope from being washed by rainwater on the ground surface to cause instability of the foundation under the slope, and adopting a Z-shaped dragging sliding device to carry out step mortar plastering construction so as to improve the construction speed;
(3) adopt disconnect-type regularization centre form, integral hoisting after the assembly, adopt the centre form to demolish the regularization support and carry out the centre form and demolish, improve centre form installation and demolish speed, centre form demolish regularization support upper portion and set up the protection that geotextile demolishd in-process case roof beam concrete to the template, prevent that the centre form from demolising the in-process and causing the case roof beam concrete damage.
Drawings
FIG. 1 is a structural diagram of a porous large-section cast-in-place box girder ultrahigh full-space support system;
FIG. 2 is a block diagram of a Z-shaped drag slide;
FIG. 3 is a structural view of an internal mold of a cast-in-situ box girder;
fig. 4 is a structural diagram of the inner mold removing and sizing bracket.
In the figure: 1, pier stud; 2, a scaffold system; 3, a foundation; 4, plastering mortar; 5, pile foundation; 6, foundation; 7, a step; 8, an abutment; 9, a box girder; 10, a box girder bottom die; 11, vertical columns; 12, height adjusting steel plates; 13, a bolt; 14, obliquely supporting; 15, an adjustable screw; 16, a steel template; 17, a cross beam; 18, a tab; 19, a Z-shaped drag slide; 20, separating a sizing inner die; 21, a lower cross brace; 22, a hinge shaft; 23, connecting a positioning pin with the inner die; 24, connecting the cross beam; 25, vertical support; 26, inner truss of inner mold; 27, fixing the bolt; 28, a support rod; 29, inner mold stay bars; 30, T-shaped laths; 31, a compression beam; 32, a travelling wheel; 33, a lower support plate; 34, removing the shaped bracket from the inner die; 35, a support column; 36, an upper support plate; 37, geotextile.
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. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Fig. 1 is a structural view of a porous large-section cast-in-place box girder full-hall support system, fig. 2 is a structural view of a Z-shaped dragging sliding device, fig. 3 is a structural view of an inner mold of a cast-in-place box girder, and fig. 4 is a structural view of a shaped support for removing the inner mold.
The technical scheme provides a construction method of a porous large-section cast-in-place box girder, which comprises the following main construction processes:
step one, foundation treatment: excavating steps (7) on an original foundation (6), constructing a mortar plastering surface (4) by adopting a Z-shaped dragging sliding device (19), adjusting the height of the steps (7) with different heights by adjusting a height adjusting steel plate (12) and a bolt (13) on an upper cross beam (17), and constructing a foundation (3);
step two, erecting a support: after the foundation (3) reaches a certain strength, the bracket system (2) is erected;
step three, bottom die installation: mounting a box girder bottom die (10), and mounting a box girder bottom film (10) on the support system (2);
step four, pre-pressing the bracket: a water bag is adopted for prepressing the bracket system (2);
step five, internal mold installation: the separated type sizing internal molds (20) are fixedly connected through connecting cross beams (24) and internal mold connecting positioning pins (23), T-shaped battens (30) are arranged between the separated type sizing internal molds (20) for filling, vertical supports (25) are fixed through internal mold internal trusses (26) and bolts (13) to adjust the shapes of the separated type sizing internal molds (20), and the upper parts of the separated type sizing internal molds (20) are fixed through compression beams (31) and supporting rods (28) to prevent templates from floating upwards in the concrete pouring process;
step six, box girder construction: binding reinforcing steel bars of the box girder (9) and pouring concrete, wherein the box girder (9) is constructed on a box girder bottom die (10);
step seven, dismantling the box girder template: the inner mold removing and sizing support (34) is used for removing the separated type sizing inner mold (20), geotextile (37) is wrapped outside the upper support plate (36) to prevent the damage of the poured concrete in the removing process, and the inner mold removing and sizing support (34) moves through the travelling wheels (32) to reduce friction force;
step eight, dismantling a support system: and (3) dismantling the bracket system (2).
As shown in fig. 1, the step (7) is excavated and arranged on the foundation (6), the upper portion of the step surface of the step (7) is provided with a mortar plastering surface (4), the mortar plastering surface (4) is provided with a foundation (3), the foundation (3) is provided with a support system (2), a box girder bottom die (10) is arranged on the support system (2) for supporting, and a box girder (9) is constructed on the upper portion of the box girder bottom die (10).
The foundation (6) is a slope, the step (7) is excavated on the foundation (6) of the slope, the foundation (3) is arranged on the step (7) to support the lower part of the support system (2), and the overall stability of the support is improved.
Wherein the foundation (3) is a strip foundation (3).
A mortar plastering surface (4) is arranged at a step (7) of the slope surface to prevent the slope from being scoured by rainwater on the ground surface to cause the instability of the foundation under the slope, and the stability of the foundation under the support is improved.
As shown in fig. 2, a structure diagram of a Z-shaped dragging sliding device is shown, the Z-shaped dragging sliding device (19) comprises at least two cross beams (17) which are horizontally paved, the two cross beams (17) are arranged in parallel and are respectively an upper cross beam and a lower cross beam, a vertical upright post (11) is arranged between the upper cross beam and the lower cross beam, the vertical upright post (11) is arranged perpendicular to the cross beams (17), and the cross beams (17) and the vertical upright post (11) form a Z-shaped structure.
The bottom side of the lower cross beam is provided with a steel template (16), the lower cross beam (17) is provided with an adjustable screw (15), and the adjustable screw (15) penetrates through the lower cross beam (17) to be connected with the steel template (16) at the fixed bottom.
The height adjusting steel plate (12) is arranged on the vertical upright post (11), the position of the height adjusting steel plate (12) can be adjusted relative to the vertical upright post (11), and the height adjusting steel plate (12) is fixed on the vertical upright post (11) through a bolt (13). One end of the upper cross beam is connected to the height adjusting steel plate (12), and then height adjustment and positioning can be performed through the height adjusting steel plate (12) and the bolts (13).
An inclined support (14) is obliquely arranged between the vertical upright post (11) and the lower cross beam.
The crossbeam (17) is provided with a pull ring (18) for dragging movement.
The structure diagram of the cast-in-place box girder inner mold is shown, and the structure at least comprises:
the inner side of the separated type sizing inner die (20) is provided with an inner die support pull rod (29) at a position close to the upper side, the inner side of the separated type sizing inner die (20) is provided with a lower cross brace (21) at a position close to the lower side, and the inner die support pull rod (29) and the lower cross brace (21) are arranged in parallel at intervals; a vertical support (25) is vertically arranged in the separated type sizing internal mold (20), and the vertical support (25) is fixed through an internal mold internal truss (26) and a fixing bolt (27); wherein a pressing beam (31) and a supporting rod (28) are arranged above the separated type sizing inner die (20) for fixing.
This cast-in-place case roof beam centre form adopts disconnect-type regularization centre form, and disconnect-type regularization centre form is whole hoist and mount after the assemblage, demolishs after the separation position, improves case roof beam centre form ann and tears construction speed open.
Specifically, a support rod (28) is arranged above the separated type sizing internal mold (20), and a pressing beam (31) is arranged on the support rod (28). The separated type sizing internal molds (20) on the two sides are symmetrically provided with support rods (28), the support rods (28) are vertical to the separated type sizing internal molds (20), and the pressing beams (31) are transversely paved on the support rods (28).
In addition, the inner mold support pull rods (29) on the two sides are oppositely connected, the lower cross braces (21) on the two sides are oppositely connected, and the vertical supports (25) are perpendicular to the inner mold support pull rods (29) and the lower cross braces (21). And the inner mold support pull rods (29) are spaced at a certain distance from the top end of the separated type sizing inner mold (20).
The connection position of the vertical supports (25) at the two ends is provided with an inner die inner truss (26), and a fixing bolt (27) penetrates through the inner die inner truss (26) to fix the vertical supports (25).
In the embodiment of the technical scheme, the separated type sizing inner molds (20) on the two sides are connected and fixed through the connecting cross beam (24) and the inner mold connecting positioning pin (23). At the moment, the connecting ends of the upper position and the lower position of the separated type sizing internal molds (20) on the two sides are provided with hinge shafts (22), the hinge shafts (22) are connected with connecting cross beams (24), and the connecting cross beams (24) are fixed through internal mold connecting positioning pins (23).
The separated type sizing internal mold (20) comprises a bending section and a parallel section to form a claw-shaped structure, and the separated type sizing internal molds (20) on the two sides are connected to form a fan-shaped structure.
Set up T shape slat (30) between disconnect-type regularization centre form (20) and fill, it is closely knit effectively to improve the template seam, improves case roof beam concrete placement quality. Namely, the T-shaped strip plate (30) is arranged at the position where the two side separated type sizing inner molds (20) are connected, and the gap between the separated type sizing inner molds (20) is filled.
In addition, the separate type sizing inner die (20) is removed through an inner die removing sizing bracket (34).
As shown in fig. 2, the structure diagram of the inner mold removing and sizing support (34) is shown, the lower portion of the inner mold removing and sizing support (34) is provided with a lower support plate (33) and a traveling wheel (32), the traveling wheel (32) is arranged below the lower support plate (33), the upper portion of the inner mold removing and sizing support is provided with an upper support plate (36), the upper support plate (36) is externally wrapped with geotextile (37), the lower support plate (33) and the upper support plate (36) are arranged in parallel at intervals, and the lower support plate (33) and the upper support plate (36) are connected through a support column (35). In addition, a pull ring (34) is arranged at the lower part of the inner mold removing and sizing bracket (34) for dragging movement, and the pull ring (34) is arranged at the outer side of the supporting column (35) and at a position close to the lower supporting plate (33).
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (8)
1. A construction method of a porous large-section cast-in-situ box girder is characterized by comprising the following main construction processes:
step one, foundation treatment: excavating steps (7) on an original foundation (6), constructing a mortar plastering surface (4) by adopting a Z-shaped dragging sliding device (19), adjusting the height of a height adjusting steel plate (12) and a bolt (13) on an upper cross beam (17) of the Z-shaped dragging sliding device (19) to adapt to the steps (7) with different heights, and constructing a foundation (3);
step two, erecting a support: after the foundation (3) reaches a certain strength, the bracket system (2) is erected;
step three, bottom die installation: mounting a box girder bottom die (10), and mounting a box girder bottom film (10) on the support system (2);
step four, pre-pressing the bracket: a water bag is adopted for prepressing the bracket system (2);
step five, internal mold installation: the separated type sizing internal molds (20) are fixedly connected through connecting cross beams (24) and internal mold connecting positioning pins (23), T-shaped battens (30) are arranged between the separated type sizing internal molds (20) for filling, vertical supports (25) are fixed through internal mold internal trusses (26) and bolts (13) to adjust the shapes of the separated type sizing internal molds (20), and the upper parts of the separated type sizing internal molds (20) are fixed through compression beams (31) and supporting rods (28) to prevent templates from floating upwards in the concrete pouring process;
step six, box girder construction: binding reinforcing steel bars of the box girder (9) and pouring concrete, wherein the box girder (9) is constructed on a box girder bottom die (10);
step seven, dismantling the box girder template: the inner mold removing and sizing support (34) is used for removing the separated type sizing inner mold (20), geotextile (37) is wrapped outside the upper support plate (36) to prevent the damage of the poured concrete in the removing process, and the inner mold removing and sizing support (34) moves through the travelling wheels (32) to reduce friction force;
step eight, dismantling a support system: and (3) dismantling the bracket system (2).
2. The construction method of the porous large-section cast-in-situ box girder according to claim 1, wherein the foundation (6) is a slope surface, and the foundation (3) is a strip foundation (3).
3. The construction method of the porous large-section cast-in-situ box girder according to the claim 1, characterized in that the Z-shaped dragging sliding device (19) comprises at least two cross beams (17) which are paved transversely, the two cross beams (17) are arranged in parallel and are respectively an upper cross beam and a lower cross beam, a vertical upright (11) is arranged between the upper cross beam and the lower cross beam, the vertical upright (11) is arranged perpendicular to the cross beams (17), and the cross beams (17) and the vertical upright (11) form a Z-shaped structure.
4. The construction method of the porous large-section cast-in-situ box girder according to claim 3, wherein the steel form (16) is arranged on the bottom side of the lower cross beam, the adjustable screw (15) is arranged on the lower cross beam (17), and the adjustable screw (15) penetrates through the lower cross beam (17) to be connected with the steel form (16) fixed on the bottom.
5. The construction method of the porous large-section cast-in-situ box girder according to claim 3, wherein the vertical upright (11) is provided with a height adjusting steel plate (12), wherein the height adjusting steel plate (12) can adjust the position relative to the vertical upright (11), the height adjusting steel plate (12) is fixed on the vertical upright (11) through a bolt (13), and one end of the upper cross beam is connected to the height adjusting steel plate (12).
6. The construction method of the porous large-section cast-in-situ box girder according to claim 1, characterized in that the split type sizing inner molds (20) with symmetrical two sides are connected with each other, wherein inner mold brace pull rods (29) are arranged at positions close to the upper side and at the inner side of the split type sizing inner molds (20), lower cross braces (21) are arranged at positions close to the lower side and at the inner side of the split type sizing inner molds (20), and the inner mold brace pull rods (29) and the lower cross braces (21) are arranged in parallel at intervals; a vertical support (25) is vertically arranged in the separated type sizing internal mold (20), and the vertical support (25) is fixed through an internal mold internal truss (26) and a fixing bolt (27); wherein a pressing beam (31) and a supporting rod (28) are arranged above the separated type sizing inner die (20) for fixing.
7. The construction method of the porous large-section cast-in-situ box girder according to claim 1, wherein a lower support plate (33) and a traveling wheel (32) are arranged at the lower part of an inner mold removing and sizing support (34), the traveling wheel (32) is arranged below the lower support plate (33), an upper support plate (36) is arranged at the upper part of the inner mold removing and sizing support, geotextile (37) is wrapped outside the upper support plate (36), the lower support plate (33) and the upper support plate (36) are arranged in parallel at intervals, and the lower support plate (33) and the upper support plate (36) are connected through a support column (35).
8. A porous large-section cast-in-place box girder, which is prepared according to the construction method of the ultrahigh full-space bracket system of the porous large-section cast-in-place box girder of any one of claims 1 to 7.
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| CN201911191647.6A CN110847052B (en) | 2019-11-28 | 2019-11-28 | Porous large-section cast-in-situ box girder and construction method |
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| CN113699885A (en) * | 2021-05-31 | 2021-11-26 | 上海宝冶集团有限公司 | Method for erecting full-space support of cast-in-place box girder in reservoir and on dam body |
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| CN110847052B (en) | 2021-09-14 |
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Denomination of invention: Porous large cross-section cast-in-place box girder and its construction method Effective date of registration: 20230927 Granted publication date: 20210914 Pledgee: Industrial Bank Limited by Share Ltd. Wuhan branch Pledgor: HUBEI PROVINCIAL ROAD & BRIDGE Co.,Ltd. Registration number: Y2023980059401 |
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