CN111472283A - Construction method and structural system for ensuring installation accuracy of steel box girder of cable-stayed bridge - Google Patents
Construction method and structural system for ensuring installation accuracy of steel box girder of cable-stayed bridge Download PDFInfo
- Publication number
- CN111472283A CN111472283A CN202010330476.7A CN202010330476A CN111472283A CN 111472283 A CN111472283 A CN 111472283A CN 202010330476 A CN202010330476 A CN 202010330476A CN 111472283 A CN111472283 A CN 111472283A
- Authority
- CN
- China
- Prior art keywords
- block
- support
- pier
- cushion
- steel box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
-
- 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
-
- 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
Abstract
The application discloses a construction method and a structural system for ensuring the installation accuracy of a steel box girder of a cable-stayed bridge. The construction method for ensuring the installation precision of the steel box girder of the cable-stayed bridge comprises the following steps: (1) dividing the beam sections; (2) mounting a bracket; (3) retesting and pretreating pier cushion stones; (4) hoisting a support; (5) hoisting the block body IV; (6) jacking the second support; (7) primarily welding the block body IV; (8) hoisting the block II and the block VI; (9) welding the block body IV; (10) jacking the first support and the third support; (11) integrally welding the beam sections; (12) and (5) grouting the support. The problem of among the correlation technique steel box girder segment's the construction precision not enough is solved in this application.
Description
Technical Field
The application relates to the field of steel box girder construction, in particular to a construction method and a structural system for ensuring the installation precision of a steel box girder of a cable-stayed bridge.
Background
With the continuous development of domestic urban bridges, the steel structure cable-stayed bridge is well applied to municipal engineering. Steel construction box roof beam is than concrete beam, has more beautifully, environmental protection, weight light weight advantage such as reliable, but its 0# piece of big section can form very big difficulty in municipal works transportation, consequently will divide into a plurality of fritters according to its structure to accomplish assembling on the support, guarantee its installation accuracy, the general step of the installation of 0# piece of steel construction is: bracket installation (or bracket installation) → support primary positioning → support and bracket elevation adjustment → support grouting positioning → steel structure 0# block hoisting → 0# block and support welding → next stage construction is carried out.
The disadvantages of this approach are: (1) municipal works roads do not have large-segment 0# block transportation conditions, and large-tonnage 0# block weight common hoisting machinery cannot meet the use requirements, so that the overall hoisting feasibility is poor.
(2) After the support grouting is finished and fixed, the elevation and the position of the 0# block are fixed, the 0# block cannot be adjusted in the later period, and the irreversibility exists, so that the process of the 0# block of the steel structure cable-stayed bridge with extremely high installation precision requirements needs to be improved.
Aiming at the problem of insufficient construction precision of a large steel box girder segment in the related art, an effective solution is not provided at present.
Disclosure of Invention
The application mainly aims to provide a construction method for ensuring the installation precision of a steel box girder of a cable-stayed bridge, so as to solve the problem of insufficient construction precision of a large steel box girder segment in the related art.
In order to achieve the above object, the present application provides a construction method for ensuring the installation accuracy of a steel box girder of a cable-stayed bridge, which comprises the following steps:
(1) dividing a beam section, namely dividing the steel box beam into at least seven blocks in the transverse bridge direction, namely a block I, a block II, a block III, a block IV, a block V, a block VI and a block VII, wherein the block IV is positioned at the center of a tower beam combining area, the block I, the block II and the block III are distributed on one side of the block IV in the bridge direction, and the block V, the block VI and the block VII are distributed on the other side of the block IV in the bridge direction;
(2) mounting a bracket, namely mounting the steel pipe bracket to the side surface of the pier by adopting the steel pipe bracket, so that the steel pipe bracket corresponds to the positions of two ends of each block body, and mounting a jack on a distribution beam of the steel pipe bracket;
(3) retesting and pretreating pier cushion stones, namely hoisting the cushion stones onto the pier and pretreating, wherein at least three cushion stones are hoisted to the center position and two sides of the pier respectively;
(4) hoisting supports, namely at least three supports, namely a first support, a second support and a third support, welding a top plate and a cushion block of each support and integrally hoisting the supports to each cushion stone, wherein the second support is positioned at the center of the pier;
(5) hoisting the block IV, namely hoisting the block IV to a position above the pier, finely adjusting the horizontal position of the block IV when the block IV is suspended, then placing the block IV on a jack corresponding to the steel pipe support, and adjusting the elevation through the jack;
(6) jacking the second support, and jacking the second support by a jack until the cushion block is tightly attached to the bottom plate of the block body IV;
(7) primarily welding the block IV, and performing positioning welding on the cushion block on the second support and the bottom plate of the block IV;
(8) hoisting the second block and the sixth block, hoisting the second block and the sixth block on two sides of the fourth block to the positions above the pier, finely adjusting the horizontal positions of the second block and the sixth block when the second block and the sixth block are suspended, then placing the second block and the sixth block on a jack corresponding to the steel pipe support, and adjusting the elevation through the jack so as to enable the second block and the sixth block to be tightly attached to two sides of the fourth block;
(9) welding a bottom plate of the block four with the rest part of the cushion block on the second support, then respectively installing a horse plate on the block four, the block two and the block six, installing a liner at the joint of the bottom plate where the cushion block is not welded, and carrying out full penetration welding on the bottom plate;
(10) jacking the first support and the third support to the extent that cushion blocks are respectively attached to the bottom plates of the second block and the sixth block through a jack, welding the bottom plate of the second block and the cushion block of the first support, welding the bottom plate of the sixth block and the cushion block of the third support, and then performing intermittent side-to-side girth welding;
(11) integrally welding the beam sections, hoisting the first block, the third block, the fifth block and the seventh block to the position above the pier, finely adjusting the horizontal positions of the first block, the third block, the fifth block and the seventh block when the first block, the third block, the fifth block and the seventh block are suspended, then placing the first block, the third block, the fifth block and the seventh block on a jack corresponding to the steel pipe support, adjusting the elevation through the jack so that the first block and the third block are tightly attached to the second block and the fourth block, the fifth block and the seventh block are tightly attached to the fourth block and the sixth block, then integrally welding the beam sections, and fixing the transverse and longitudinal joints through horse boards;
(12) and grouting the first support, the second support and the third support in sequence.
Furthermore, the number of the transverse bridge directions of the cushion stones is four, two cushion stones are positioned at the center of the pier and symmetrically distributed, and the two second supports are respectively a second support A and a second support B and are hoisted to the cushion stones at the center of the pier one by one;
the second support jacking specifically comprises the following steps:
(601) two supporting I-beams with the length larger than the width of the second support top plate are arranged at the lower end of the second support top plate, and a jack is arranged at the lower end of the I-beam;
(602) jacking the second support B by a jack until the cushion block is tightly attached to the four bottom plates of the block body;
(603) welding the block body IV and the second support B in a positioning manner;
(604) jacking the second support A through a jack until the cushion block is tightly attached to the four bottom plates of the block body;
(605) and welding the block body IV and the second support A in a positioning manner.
Furthermore, when the segment needs to be adjusted along the bridge direction, one end of the chain block is connected with a steel box girder lifting lug or a temporary welding lifting lug, and the other end of the chain block is stressed through a ground pre-buried anchor and is determined through measurement and rechecking; when the beam section needs to be transversely knocked to adjust the section, one end of the chain block is fixed with the steel box beam, and the other end of the chain block is connected with a stress bracket welded on the embedded cushion block and determined through measurement and rechecking.
Further, the positioning welding specifically comprises: and (3) carrying out three-side tack welding on the cushion block and the bottom plate, wherein the thickness of a tack weld is 5mm, the length of the weld is 100mm, the interval is 300mm, and a middle weld is reserved to be integrally formed with the beam body at last.
Further, block two and six hoists of block include that install the left and right sides both ends of block two respectively on first support and adjacent second support, and the left and right sides both ends of block six are installed respectively on adjacent second support and third support.
Further, the support grouting specifically comprises:
(120) grouting the foundation bolt, removing oil stain and iron rust on the surface of the foundation bolt before grouting, when the foundation bolt forms a hole, the horizontal deviation of a bolt hole is not more than 5mm, the verticality deviation is not more than 5 degrees, the hole wall of the bolt is rough, cleaning the hole, removing impurities such as floating ash and oil stain, soaking the hole in water for 8-12 h before grouting, and removing accumulated water in the hole;
(121) and (5) secondary grouting.
Further, the secondary grouting specifically comprises:
(a) before grouting, cleaning the equipment bottom plate and the surface of the concrete foundation which are in contact with a grouting material, and removing loose crushed stones, floating slurry, floating ash, oil stains and wax;
(b) installing templates along the periphery of the support, wherein the sizes of two sides of the templates along the transverse axis direction of the pier are larger than the width of the support by 100mm respectively, and the elevation of the top of the template is not lower than the upper surface of the base of the support by 50 mm;
(c) before grouting, adjusting the support base plate to a horizontal position;
(d) grouting from one side until the other side overflows;
(e) after grouting is finished, cutting a 45-degree bevel outwards along the edge of the template plate within 3-6 h;
(f) and (5) maintaining and removing the mold.
Further, the construction method further comprises the following steps:
(13) installing a pier top stabilizing support, embedding eight steel plate small struts at the pier top, enabling the steel plate small struts to be distributed along the circumferential direction of the pier top, adopting 40# I-shaped steel for the embedded steel plate small struts, accurately calculating the welding length of the supporting small struts according to the design elevation and considering the influence of the longitudinal gradient on site, and performing professional finish machining.
Furthermore, the steel pipe support is supported by a phi 325 × 6 steel pipe, a double-spliced 32a # I-steel beam and a dental lamina, and adjacent steel pipes are connected by an inclined support and a flat support which are made of channel steel.
Furthermore, the first support adopts a tension-compression spherical support, and the second support and the third support adopt spherical supports.
According to another aspect of the present application, there is provided a structural system using a construction method for ensuring installation accuracy of a steel box girder of a cable-stayed bridge, including: the bridge comprises a bridge pier, steel pipe supports arranged on the periphery of the bridge pier and a cushion stone arranged on the upper end surface of the bridge pier and distributed along the length direction of the bridge pier; the steel box girder is hoisted to the steel pipe bracket; the support is arranged on the cushion stone, and a gap is formed between a top plate of the support and a bottom plate of the steel box girder; and the jack is arranged between the support top plate and the cushion stone and used for jacking the support top plate to be tightly attached to the steel box girder bottom plate.
Furthermore, at least four cushion stones are arranged, wherein two cushion stones are positioned at the center of the bridge pier and are symmetrically distributed; the number of the supports is at least four, and the supports are respectively a first support, a second support A, a second support B and a third support;
further, the steel box girder is divided into at least seven blocks along the transverse bridge direction, namely a block I, a block II, a block III, a block IV, a block V, a block VI and a block VII, wherein the block IV is positioned at the center of the combination area of the tower girder, the block I, the block II and the block III are distributed on one side of the block IV along the bridge direction, and the block V, the block VI and the block VII are distributed on the other side of the block IV along the bridge direction; wherein the content of the first and second substances,
the block body IV is arranged on a second support A and a second support B, two ends of the block body II are respectively arranged on the first support A and the second support A, and two ends of the block body VI are respectively arranged on a third support and the second support B; the first block, the second block, the third block, the fourth block, the fifth block, the sixth block and the seventh block are integrally welded.
In the embodiment of the application, adopt the mode of anti-installation, divide into seven at least through with monoblock steel box girder, thereby reduce the weight of steel box girder, be convenient for transportation and hoist and mount, then hoist and mount the block four that is located the middle part earlier to second support top, jack-up the second support with the position of location block four again, then hoist and mount block two and the block six that are located block four both sides to first support and third support on, accomplish the whole location of block four, hoist remaining block to the pier and accomplish the beam section integral welding again, grout each support again at last, the elevation and the horizontal position of confirming steel box girder earlier have been reached, the purpose of fixing support again, thereby realized reducing the error of steel box girder installation, improve the technological effect of installation accuracy, and then solved the not enough problem of the construction accuracy of steel box girder segment in the correlation technique.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
FIG. 1 is a schematic structural diagram of beam segment division according to an embodiment of the present application;
FIG. 2 is a schematic view of a construction plan according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a top-view structure in construction according to an embodiment of the present application;
FIG. 4 is a schematic top view of a bridge pier according to an embodiment of the present application;
FIG. 5 is a schematic view of a welded structure of a spacer according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a second pedestal jacking structure according to an embodiment of the present application;
FIG. 7 is a schematic top view of a second pedestal jacking according to an embodiment of the present application;
FIG. 8 is a schematic structural view of a support after grouting according to an embodiment of the application;
FIG. 9 is a schematic side view of a construction structure according to an embodiment of the present application;
FIG. 10 is a schematic illustration of a construction flow according to an embodiment of the present application;
the bridge comprises a bridge pier 1, a support 2, a steel box girder 3, a block four 31, a block two 32, a block six 33, a block seven 34, a block five 35, a block one 36, a block three 37, a block three 4, a second support 5, a second support A51, a second support B52, a small support 6, a first support 7, a cushion block 8, a cushion stone 9, a support I-steel 10 and a jack 11.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used.
In this application, the terms "upper", "lower", "inside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "disposed," "provided," "connected," "secured," and the like are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 10, an embodiment of the present application provides a construction method for ensuring installation accuracy of a steel box girder of a cable-stayed bridge, where the construction method for ensuring installation accuracy of a steel box girder of a cable-stayed bridge includes the following steps:
(1) dividing a beam section, namely dividing the steel box girder 3 into at least seven blocks along a transverse bridge direction as shown in fig. 1, wherein the seven blocks are respectively a first block 36, a second block 32, a third block 37, a fourth block 31, a fifth block 35, a sixth block 33 and a seventh block 34, the fourth block 31 is positioned at the center of a tower girder combining area, the first block 36, the second block 32 and the third block 37 are distributed on one side of the fourth block 31 along the bridge direction, the fifth block 35, the sixth block 33 and the seventh block 34 are distributed on the other side of the fourth block 31 along the bridge direction, and the weight and the size of the steel box girder 3 divided into the seven blocks are reduced, so that the steel box girder is convenient to transport and hoist;
(2) the method comprises the following steps that (1) a support 2 is installed, a steel pipe support 2 is adopted, the steel pipe support 2 is hoisted to the side face of a pier 1, so that the steel pipe support 2 corresponds to the positions of two ends of each block, jacks are installed on distribution beams of the steel pipe support 2 and used for adjusting elevation, the steel pipe support 2 mainly plays a supporting role, when a steel box beam 3 is divided into seven blocks, the steel pipe support 2 is arranged into 14 groups as shown in figure 2, 8 groups are distributed on the left side and the right side of the pier 1, 6 groups are distributed on the front side and the rear side of the pier 1, the steel pipe support 2 can adopt the existing support 2 structure, for example, a phi 325 × 6 steel pipe, a double-spliced 32a # I-steel beam and a tooth plate are adopted, and adjacent steel pipes;
(3) retesting and pretreating the pad stones 9 of the bridge pier 1, hoisting the pad stones 9 to the bridge pier 1 for pretreatment, roughening the top surface of the pad stones 9, cleaning and washing the top surface and removing accumulated water, marking lines on the pad stones 9, and hoisting at least three pad stones 9 to the center position and two sides of the bridge pier 1 respectively;
(4) hoisting supports, wherein the number of the supports is at least three, the supports are respectively a first support 7, a second support 5 and a third support 4, a top plate and a cushion block 8 of each support are welded and integrally hoisted onto each cushion stone 9, the second support 5 is positioned at the center position of a pier 1, the supports are carefully and safely hoisted into the corresponding cushion stone 9 according to a lofting position, the direction of the supports is noticed when the supports are placed, the four angular points are aligned according to measurement lofting, the supports are placed after the directions are confirmed according to a construction design drawing, then whether the installation meets the requirements is detected, the traditional cushion block 8 is welded on a bottom plate of the steel box girder 3 after being divided, and in order to avoid the deformation of the cushion block 8 in the transportation process of the steel box girder 3, the cushion block 8 is welded on the top plate of the supports firstly, and the installation precision is further ensured;
(5) hoisting the block IV 31, namely hoisting the block IV 31 to a position above the pier 1, finely adjusting the horizontal position of the block IV 31 when the block IV 31 is suspended, then placing the block IV 31 on a jack corresponding to the steel pipe support 2, and adjusting the elevation through the jack, wherein because the block IV 31 is heavy in weight, the crane station is selected to be at a position close to the pier 1 and stops at the side surface, so when the block IV 31 is hoisted, the middle part support 2 in the step (2) needs to be installed after the block IV 31 is hoisted;
(6) jacking the second support 5, adopting two I14 supporting I-beams 10 with the length being 30cm greater than the width of a top plate of the support as supports, jacking the top plate of the second support 5 to a position where a cushion block 8 is tightly attached to a bottom plate of a block body IV 31 from four directions through at least four 50t jacks 10, reserving a gap of 50mm between the lower plate of the second support 5 and a cushion stone 9, and checking the installation center line and elevation for the second time;
(7) primarily welding the block body IV 31, performing positioning welding on the cushion block 8 on the second support 5 and the bottom plate of the block body IV 31, adjusting the jack 10, performing three-surface positioning welding on the cushion block 8 and the beam bottom after the cushion block 8 is closely attached to the beam bottom, wherein the thickness of a positioning welding line is 5mm, the length of the welding line is 100mm, the distance between the welding lines is 300mm, reserving a middle welding line, and finally integrally forming the middle welding line and the beam body;
(8) hoisting a second block 32 and a sixth block 33, hoisting the second block 32 and the sixth block 33 on two sides of the fourth block 31 to the position above the pier 1, finely adjusting the horizontal positions of the second block 32 and the sixth block 33 when the second block 32 and the sixth block 33 are suspended, then placing the second block 32 and the sixth block 33 on a jack corresponding to the steel pipe support 2, and adjusting the elevation through the jack so as to be tightly attached to two sides of the fourth block 31, wherein when the section needs to be adjusted along the bridge direction, one end of a chain block is connected with a lifting lug of a steel box girder 3 or a temporary welding lifting lug, and the other end of the chain block is stressed through a ground anchor embedded on the ground and is determined; when the beam section needs to be transversely knocked to adjust the section, one end of the chain block is fixed with the steel box beam 3, the other end of the chain block is connected with the stress support 2 welded on the pre-embedded cushion block 8, and the measurement and the rechecking are carried out to determine that the beam bottom is adjusted to the designed beam bottom elevation through the jack and the chain block, a tooth plate device with a proper size is welded between the distribution quantity and the beam bottom to play a supporting role, and the jack is removed;
(9) welding a fourth block 31, namely welding a bottom plate of the fourth block 31 with the rest part of the cushion block 8 on the second support 5, then respectively installing a horse plate on the fourth block 31, a second block 32 and a sixth block 33 to play a role in fixing the position of a beam section, installing a ceramic liner at a joint where the cushion block 8 is not welded on the bottom plate, carrying out full penetration welding on the bottom plate, and using the cushion block 8 as a steel liner;
(10) the first support 7 and the third support 4 are jacked up, the first support 7 and the third support 4 are jacked up to the cushion block 8 through a jack and are respectively attached to the bottom plates of the second block 32 and the sixth block 33, the bottom plate of the second block 32 and the cushion block 8 of the first support 7 are welded, and the bottom plate of the sixth block 33 and the cushion block 8 of the third support 4 are welded, so that in order to avoid deformation of a steel structure caused by heat concentration, intermittent butt welding is adopted for field girth welding, and thermal stress deformation is effectively controlled;
(11) integrally welding beam sections, namely hoisting the first block 36, the third block 37, the fifth block 35 and the seventh block 34 to the position above the pier 1, finely adjusting the horizontal positions of the first block 36, the third block 37, the fifth block 35 and the seventh block 34 when the bridge is suspended, then placing the first block 36, the third block 37, the fifth block 35 and the seventh block 34 on a jack corresponding to the steel pipe support 2, adjusting the elevation through the jack to enable the first block 36 and the third block 37 to be tightly attached to the second block 32 and the fourth block 31, enabling the fifth block 35 and the seventh block 34 to be tightly attached to the fourth block 31 and the sixth block 33, and then integrally welding the beam sections, wherein transverse and longitudinal joints are fixed through horse boards;
(12) and (3) grouting the support, namely grouting the first support 7, the second support 5 and the third support 4 in sequence.
In the embodiment, the steel box girder 3 is divided into sections by the support 2 to bear, the mounting precision of the steel box girder 3 is improved by the support reverse mounting process, the purposes of improving the construction efficiency, the economic benefit and the construction safety are achieved, and the structural stress of the steel box girder meets the standard requirement through the midas Civil check.
As shown in fig. 1 to 10, the transverse direction of the pad stones 9 is set to be four, two pad stones 9 are positioned at the center of the pier 1 and symmetrically distributed, and the second support 5 is set to be two, namely a second support a51 and a second support B52, and is lifted to the pad stones 9 at the center of the pier 1 one by one;
the second support 5 is specifically jacked up as follows:
(601) two supporting I-beams 10 with the length larger than the width of the top plate of the second support 5 are arranged at the lower end of the top plate of the second support 5, and a jack is arranged at the lower end of the I-beam;
(602) jacking the second support B52 by a jack until the cushion block 8 is tightly attached to the bottom plate of the block body IV 31;
(603) welding the block body four 31 and the second support B52 in a positioning manner;
(604) jacking the second support A51 by a jack until the cushion block 8 is tightly attached to the bottom plate of the block body IV 31;
(605) and welding the block body four 31 and the second support A51.
As shown in fig. 1 to 10, the hoisting of the second block 32 and the sixth block 33 includes that the left and right ends of the second block 32 are respectively installed on the first support 7 and the second support a51, the left and right ends of the sixth block 33 are respectively installed on the second support B52 and the third support 4, the first support 7 adopts a pull-press ball-type support, and the second support 5 and the third support 4 adopt a ball-type support.
As shown in fig. 1 to 10, the self-weight grouting method adopted for the support grouting specifically comprises the following steps:
(120) grouting the foundation bolt, removing oil stain and iron rust on the surface of the foundation bolt before grouting, when the foundation bolt forms a hole, the horizontal deviation of a bolt hole is not more than 5mm, the verticality deviation is not more than 5 degrees, the hole wall of the bolt is rough, cleaning the hole, removing impurities such as floating ash and oil stain, soaking the hole in water for 8-12 h before grouting, and removing accumulated water in the hole;
(121) secondary grouting:
(a) before grouting, cleaning the equipment bottom plate and the surface of the concrete foundation which are in contact with the grouting material, removing loose broken stones, floating slurry, floating ash, oil stains, wax and the like, and fully wetting the surface of the foundation concrete 24 hours before grouting. 1h before grouting, removing accumulated water;
(b) installing templates along the periphery of the support, wherein the sizes of two sides of the templates along the transverse axis direction of the pier 1 are larger than the width of the support by 100mm respectively, and the elevation of the top of each template is not lower than the upper surface of the base of the support by 50 mm;
(c) before grouting, adjusting the support base plate to a horizontal position;
(d) during grouting, grouting is carried out from one side until the other side overflows, grouting cannot be simultaneously carried out from two opposite sides, grouting must be continuously carried out after the grouting is started, the grouting time is shortened as much as possible, vibration is strictly prohibited during the grouting process, a grouting booster can be adopted as necessary, grouting materials are boosted along the flowing direction of slurry, pushing from the middle part and the upper part of grouting is strictly prohibited, and segmented construction can be carried out according to actual conditions for grouting construction with large support size;
(e) after grouting is finished, cutting a 45-degree bevel outwards along the edge of the template plate within 3-6 h;
(f) and after grouting is finished, timely curing the grouting material at the exposed part, spraying a curing agent or covering a plastic film on the spot, covering a wet straw bag or geotextile to keep wet, wherein the curing time is not less than 7d, when the plastic film is used for covering the spot, the exposed part of the cement grouting material needs to be tightly covered, the condensed water in the plastic film is kept, when the surface of the grouting material is inconvenient to spray water, the curing agent can be sprayed, and the template can be detached after the grouting is finished for 1 d.
As shown in fig. 1 to 10, the construction method further includes:
(13) installing a pier top stabilizing support, embedding eight small steel plate pillars 6 on the pier top on site in order to increase the stability of the whole steel box girder 3 when a steel tower is installed, enabling the small steel plate pillars 6 to be distributed along the circumferential direction of the pier top, adopting 40# I-shaped steel for the embedded small steel plate pillars 6, accurately calculating the welding length of the small supporting pillars 6 on site according to the design elevation and considering the influence of the longitudinal gradient, and performing professional finish machining.
As shown in fig. 1 to 10, according to another aspect of the present application, there is provided a structural system to which a construction method for securing an installation accuracy of a steel box girder of a cable-stayed bridge is applied, including:
the bridge pier comprises a bridge pier 1, steel pipe supports 2 arranged on the periphery of the bridge pier 1 and a cushion stone 9 arranged on the upper end surface of the bridge pier 1 and distributed along the length direction of the bridge pier 1;
the steel box girder 3 is hoisted to the steel pipe bracket 2;
the support is arranged on the cushion stone 9, and a gap is formed between the top plate of the support and the bottom plate of the steel box girder 3;
and the jack 10 is arranged between the support top plate and the cushion stone 9 and used for jacking the support top plate to be tightly attached to the bottom plate of the steel box girder 3.
As shown in fig. 1 to 10, at least four cushion stones 9 are provided, wherein two cushion stones 9 are located at the center of the pier 1 and symmetrically distributed;
the number of the supports is at least four, namely a first support 7, a second support A51, a second support B52 and a third support 4;
as shown in fig. 1 to 10, the steel box girder 3 is divided into at least seven blocks in the transverse bridge direction, namely a block one 36, a block two 32, a block three 37, a block four 31, a block five 35, a block six 33 and a block seven 34, wherein the block four 31 is located at the center of the tower girder junction area, the block one 36, the block two 32 and the block three 37 are distributed on one side of the block four 31 in the bridge direction, and the block five 35, the block six 33 and the block seven 34 are distributed on the other side of the block four 31 in the bridge direction; wherein the content of the first and second substances,
the block body four 31 is arranged on a second support A51 and a second support B52, two ends of the block body two 32 are respectively arranged on the first support 7 and the second support A51, and two ends of the block body six 33 are respectively arranged on the third support 4 and the second support B52;
and the first block 36, the second block 32, the third block 37, the fourth block 31, the fifth block 35, the sixth block 33 and the seventh block 34 are integrally welded.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A construction method for ensuring the installation accuracy of a steel box girder of a cable-stayed bridge is characterized by comprising the following steps:
(1) dividing a beam section, namely dividing the steel box beam into at least seven blocks in the transverse bridge direction, namely a block I, a block II, a block III, a block IV, a block V, a block VI and a block VII, wherein the block IV is positioned at the center of a tower beam combining area, the block I, the block II and the block III are distributed on one side of the block IV in the bridge direction, and the block V, the block VI and the block VII are distributed on the other side of the block IV in the bridge direction;
(2) mounting a bracket, namely mounting the steel pipe bracket to the side surface of the pier by adopting the steel pipe bracket, so that the steel pipe bracket corresponds to each block position, and mounting a jack on a distribution beam of the steel pipe bracket;
(3) retesting and pretreating pier cushion stones, namely hoisting the cushion stones onto the pier and pretreating, wherein at least three cushion stones are hoisted to the center position and two sides of the pier respectively;
(4) hoisting supports, namely at least three supports, namely a first support, a second support and a third support, welding a top plate and a cushion block of each support and integrally hoisting the supports to each cushion stone, wherein the second support is positioned at the center of the pier;
(5) hoisting the block IV, namely hoisting the block IV to a position above the pier, finely adjusting the horizontal position of the block IV when the block IV is suspended, then placing the block IV on a jack corresponding to the steel pipe support, and adjusting the elevation through the jack;
(6) jacking the second support, and jacking the second support by a jack until the cushion block is tightly attached to the bottom plate of the block body IV;
(7) primarily welding the block IV, and performing positioning welding on the cushion block on the second support and the bottom plate of the block IV;
(8) hoisting the second block and the sixth block, hoisting the second block and the sixth block on two sides of the fourth block to the positions above the pier, finely adjusting the horizontal positions of the second block and the sixth block when the second block and the sixth block are suspended, then placing the second block and the sixth block on a jack corresponding to the steel pipe support, and adjusting the elevation through the jack so as to enable the second block and the sixth block to be tightly attached to two sides of the fourth block;
(9) welding a bottom plate of the block four with the rest part of the cushion block on the second support, then respectively installing a horse plate on the block four, the block two and the block six, installing a liner at the joint of the bottom plate where the cushion block is not welded, and carrying out full penetration welding on the bottom plate;
(10) jacking the first support and the third support to the extent that cushion blocks are respectively attached to the bottom plates of the second block and the sixth block through a jack, welding the bottom plate of the second block and the cushion block of the first support, welding the bottom plate of the sixth block and the cushion block of the third support, and then performing intermittent side-to-side girth welding;
(11) integrally welding the beam sections, hoisting the first block, the third block, the fifth block and the seventh block to the position above the pier, finely adjusting the horizontal positions of the first block, the third block, the fifth block and the seventh block when the first block, the third block, the fifth block and the seventh block are suspended, then placing the first block, the third block, the fifth block and the seventh block on a jack corresponding to the steel pipe support, adjusting the elevation through the jack so that the first block and the third block are tightly attached to the second block and the fourth block, the fifth block and the seventh block are tightly attached to the fourth block and the sixth block, then integrally welding the beam sections, and fixing the transverse and longitudinal joints through horse boards;
(12) and grouting the first support, the second support and the third support in sequence.
2. The construction method for ensuring the installation accuracy of the steel box girder of the cable-stayed bridge according to claim 1, wherein the number of the transverse direction of the pad stones is four, two of the pad stones are symmetrically distributed at the center of a pier, the two second supports are respectively a second support A and a second support B, and the two second supports are respectively hoisted to the pad stones at the center of the pier;
the second support jacking specifically comprises the following steps:
(601) two supporting I-beams with the length larger than the width of the second support top plate are arranged at the lower end of the second support top plate, and a jack is arranged at the lower end of the I-beam;
(602) jacking the second support B by a jack until the cushion block is tightly attached to the four bottom plates of the block body;
(603) welding the block body IV and the second support B in a positioning manner;
(604) jacking the second support A through a jack until the cushion block is tightly attached to the four bottom plates of the block body;
(605) and welding the block body IV and the second support A in a positioning manner.
3. The construction method for ensuring the installation accuracy of the steel box girder of the cable-stayed bridge according to claim 1, wherein the horizontal position adjustment of the block body four is specifically as follows:
when the segment needs to be adjusted along the bridge direction, one end of the chain block is connected with a steel box girder lifting lug or a temporary welding lifting lug, and the other end of the chain block is stressed through a ground pre-buried anchor and is determined through measurement and rechecking; when the beam section needs to be transversely knocked to adjust the section, one end of the chain block is fixed with the steel box beam, and the other end of the chain block is connected with a stress bracket welded on the embedded cushion block and determined through measurement and rechecking.
4. The construction method for ensuring the installation accuracy of the steel box girder of the cable-stayed bridge according to claim 1, wherein the hoisting of the second block and the sixth block comprises the steps of respectively installing the left end and the right end of the second block on the first support and the second support A, and respectively installing the left end and the right end of the sixth block on the second support B and the third support.
5. The construction method for ensuring the installation accuracy of the steel box girder of the cable-stayed bridge according to claim 1, wherein the support grouting specifically comprises the following steps:
(120) grouting the foundation bolt, removing oil stain and iron rust on the surface of the foundation bolt before grouting, when the foundation bolt forms a hole, the horizontal deviation of a bolt hole is not more than 5mm, the verticality deviation is not more than 5 degrees, the hole wall of the bolt is rough, cleaning the hole, removing impurities such as floating ash and oil stain, soaking the hole in water for 8-12 h before grouting, and removing accumulated water in the hole;
(121) and (5) secondary grouting.
6. The construction method for ensuring the installation accuracy of the steel box girder of the cable-stayed bridge according to claim 1, wherein the secondary grouting specifically comprises the following steps:
(a) cleaning the equipment bottom plate and the concrete foundation surface which are in contact with the grouting material, and removing loose broken stones, floating slurry, floating ash, oil stains and wax;
(b) installing templates along the periphery of the support, wherein the sizes of two sides of the templates along the transverse axis direction of the pier are larger than the width of the support by 100mm respectively, and the elevation of the top of the template is not lower than the upper surface of the base of the support by 50 mm;
(c) before grouting, adjusting the support base plate to a horizontal position;
(d) grouting from one side until the other side overflows;
(e) after grouting is finished, cutting a 45-degree bevel outwards along the edge of the template plate within 3-6 h;
(f) and (5) maintaining and removing the mold.
7. The construction method for ensuring the installation accuracy of a steel box girder of a cable-stayed bridge according to claim 1, wherein the construction method further comprises:
(13) installing a pier top stabilizing support, embedding eight steel plate small struts at the pier top, enabling the steel plate small struts to be distributed along the circumferential direction of the pier top, adopting 40# I-shaped steel for the embedded steel plate small struts, accurately calculating the welding length of the supporting small struts according to the design elevation and considering the influence of the longitudinal gradient on site, and performing professional finish machining.
8. A structural system to which a construction method for securing an installation accuracy of a steel box girder for a cable-stayed bridge according to any one of claims 2 to 7 is applied, comprising:
the bridge comprises a bridge pier, steel pipe supports arranged on the periphery of the bridge pier and a cushion stone arranged on the upper end surface of the bridge pier and distributed along the length direction of the bridge pier;
the steel box girder is hoisted to the steel pipe bracket;
the support is arranged on the cushion stone, and a gap is formed between a top plate of the support and a bottom plate of the steel box girder;
and the jack is arranged between the support top plate and the cushion stone and used for jacking the support top plate to be tightly attached to the steel box girder bottom plate.
9. The structural system of the construction method for ensuring the installation accuracy of the steel box girders of the cable-stayed bridge according to claim 8, wherein the number of the pad stones is at least four, and two of the pad stones are positioned at the center of a pier and symmetrically distributed;
the support sets up to four at least, is first support, second support A, second support B and third support respectively.
10. The structural system of the construction method for ensuring the installation accuracy of the steel box girder of the cable-stayed bridge according to the claim 9, wherein the steel box girder is divided into at least seven blocks along the transverse bridge direction, namely a block I, a block II, a block III, a block IV, a block V, a block VI and a block VII, wherein the block IV is positioned at the center of the tower girder combining area, the block I, the block II and the block III are distributed at one side of the block IV along the bridge direction, and the block V, the block VI and the block VII are distributed at the other side of the block IV along the bridge direction; wherein the content of the first and second substances,
the block body IV is arranged on a second support A and a second support B, two ends of the block body II are respectively arranged on the first support A and the second support A, and two ends of the block body VI are respectively arranged on a third support and the second support B;
the first block, the second block, the third block, the fourth block, the fifth block, the sixth block and the seventh block are integrally welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010330476.7A CN111472283B (en) | 2020-04-23 | 2020-04-23 | Construction method and structural system for ensuring installation accuracy of steel box girder of cable-stayed bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010330476.7A CN111472283B (en) | 2020-04-23 | 2020-04-23 | Construction method and structural system for ensuring installation accuracy of steel box girder of cable-stayed bridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111472283A true CN111472283A (en) | 2020-07-31 |
| CN111472283B CN111472283B (en) | 2021-06-18 |
Family
ID=71761778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010330476.7A Active CN111472283B (en) | 2020-04-23 | 2020-04-23 | Construction method and structural system for ensuring installation accuracy of steel box girder of cable-stayed bridge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111472283B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112554064A (en) * | 2020-11-30 | 2021-03-26 | 中交路桥建设有限公司 | Installation method of few-bracket ultra-wide steel structure bridge |
-
2020
- 2020-04-23 CN CN202010330476.7A patent/CN111472283B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112554064A (en) * | 2020-11-30 | 2021-03-26 | 中交路桥建设有限公司 | Installation method of few-bracket ultra-wide steel structure bridge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111472283B (en) | 2021-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101781879B (en) | Construction method of single-pylon cable-stayed bridge without dorsal cables | |
| CN101691787B (en) | Converse construction process for middle-high steel structure building | |
| CN103061505B (en) | A kind of multi-functional split bolt and uses thereof | |
| CN103498425B (en) | One completely knocks down multifunctional assembled bearing bracket structure and construction method thereof | |
| CN102296542B (en) | Method for constructing high pier capping beams | |
| CN205025086U (en) | Strength nature skeleton concrete beam construction suspend template in midair | |
| CN212984489U (en) | Template connection structure on high-strength curve ultra-flat ground | |
| CN111980020A (en) | Construction method of double-wall steel suspension box cofferdam of main bridge bearing platform of super-large bridge | |
| CN106498853A (en) | A kind of construction method of high ferro across existing railway large-span steel bent cap | |
| CN106120835B (en) | A kind of circle concrete structures toe board panel guide rail and its levelling construction | |
| CN113202222A (en) | Construction method for assembled type superposed beam slab | |
| CN114183000A (en) | Manufacturing and mounting construction method for outer tank steel dome of large-scale low-temperature storage tank | |
| CN112227416A (en) | Construction method of assembled steel pipe support and distribution beam combined support | |
| CN111472283B (en) | Construction method and structural system for ensuring installation accuracy of steel box girder of cable-stayed bridge | |
| CN109881587B (en) | Integral installation method of main tower upper cross beam support in strong wind environment | |
| CN110700023A (en) | Steel spring floating plate integral ballast bed construction method based on rail engineering | |
| CN102777044A (en) | Hoisting method of steel-structured spraying layer of urea prilling tower | |
| CN110509424B (en) | Construction method for transversely moving beams by double-track trolley | |
| CN105040992B (en) | Reverse inverted-insertion type construction method for structural steel columns | |
| CN101693389A (en) | Method for precast concrete template | |
| CN201588172U (en) | Integral single-tower non-dorsal-cord cable-stayed-bridge king tower lifting template | |
| CN106592438A (en) | Two-column pier and middle tie beam construction method employing integral movement of trusses | |
| CN111186780A (en) | Movable arm type tower crane underframe weight type foundation and construction method | |
| CN215801777U (en) | Multi-group bolt fixing structure | |
| CN111622078B (en) | Steel box girder convenient to assemble for curved landscape bridge and hoisting construction process of steel box girder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Chuan Inventor after: Tian Lianmin Inventor after: Yan Wanghu Inventor after: Qu Kai Inventor after: Zhao Xiang Inventor after: Zhang Bingbing Inventor before: Tian Lianmin Inventor before: Li Chuan Inventor before: Yan Wanghu Inventor before: Qu Kai Inventor before: Zhao Xiang Inventor before: Zhang Bingbing |
|
| CB03 | Change of inventor or designer information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |