CN112227204A - Side span pushing closure construction method for cable-stayed bridge - Google Patents
Side span pushing closure construction method for cable-stayed bridge Download PDFInfo
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- CN112227204A CN112227204A CN202010788860.1A CN202010788860A CN112227204A CN 112227204 A CN112227204 A CN 112227204A CN 202010788860 A CN202010788860 A CN 202010788860A CN 112227204 A CN112227204 A CN 112227204A
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- side span
- beam section
- closure
- span beam
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a side span pushing closure construction method of a cable-stayed bridge, which comprises the following steps: s001: firstly, storing side span beam sections on a side span high support and connecting the side span beam sections into a whole, and hoisting a closure opening secondary side span beam section to a closure opening when a main bridge cantilever is hoisted to a side span closure section; s002: hoisting the closure opening secondary side span beam section in place and then connecting the closure opening secondary side span beam section with the previous beam section, adjusting the closure opening secondary side span beam section elevation to be close to the side span beam section elevation through a tensioning stay cable, adjusting the closure opening secondary side span beam section axis through a chain block, pushing the side span beam section through a pushing device below the side span beam section after the adjustment is in place, and enabling the side span beam section to be sequentially connected with the closure opening secondary side span beam section; s003: and finely adjusting the elevation of the closure opening secondary side span beam section through a screw jack, and connecting the closure opening secondary side span beam section and the side span beam section through a splice plate and a high-strength bolt to complete the closure of the side span of the cable-stayed bridge.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a side span pushing closure construction method of a cable-stayed bridge.
Background
With the increasing construction scale of large-span bridges, the cable-stayed bridge is a common bridge type at home and abroad by virtue of the advantages of strong spanning capability, economy and beauty. The side span closure construction is a key process of cable-stayed bridge construction, and the closure precision is of great importance to the influence of the full-bridge quality. At present, the closure method adopted by the cable-stayed bridge in China is greatly influenced by temperature, and the closure precision and the structural stress after closure are difficult to achieve the expected effect.
Disclosure of Invention
In view of the above, the present invention provides a method for constructing a cable-stayed bridge by side span pushing closure, which overcomes the above problems or at least partially solves or alleviates the above problems.
The invention provides a side span pushing closure construction method of a cable-stayed bridge, which is characterized by comprising the following steps of: s001: firstly, storing side span beam sections on a side span high support and connecting the side span beam sections into a whole, and hoisting a closure opening secondary side span beam section to a closure opening when a main bridge cantilever is hoisted to a side span closure section; s002: hoisting the closure opening secondary side span beam section in place and then connecting the closure opening secondary side span beam section with the previous beam section, adjusting the closure opening secondary side span beam section elevation to be close to the side span beam section elevation through a tensioning stay cable, adjusting the closure opening secondary side span beam section axis through a chain block, pushing the side span beam section through a pushing device below the side span beam section after the adjustment is in place, and enabling the side span beam section to be sequentially connected with the closure opening secondary side span beam section; s003: and finely adjusting the elevation of the closure opening secondary side span beam section through a screw jack, and connecting the closure opening secondary side span beam section and the side span beam section through a splice plate and a high-strength bolt to complete the closure of the side span of the cable-stayed bridge.
In step S001: firstly, hoisting the closure opening secondary side span beam section in place, then completing the connection with the previous beam section, wherein one end of the closure opening secondary side span beam section is fixedly connected, the other end is a free end, and the elevation of the closure opening secondary side span beam section is close to that of the side span beam section by adjusting the stay cable.
In step S001, the elevation of the free end of the closure gap secondary side span beam section can be raised by tensioning the stay cable, and the elevation of the free end of the closure gap secondary side span beam section is lowered by tensioning the stay cable of the previous beam section.
In step S002, the two chain blocks are connected to the middle web of the closure opening secondary side span beam section and the side span beam section respectively, and then the two chain blocks are pulled oppositely to make the axes of the closure opening secondary side span beam section and the side span beam section coincide.
In step S002, the connection directions of the two chain blocks cross each other.
In step S002, after the pusher is disposed below the side span beam section, the reaction seat of the pusher is disposed on the rail of the side span high bracket, and the side span beam section is slid by the pusher.
In step S003, a counter-force bracket is connected to each of the middle web of the closure secondary side span and the middle web of the side span, and a screw jack is installed between the two counter-force brackets, so that the closure secondary side span and the side span are driven by the screw jack between the two counter-force brackets to perform elevation adjustment.
In step S003, the two ends of the splice plate are respectively driven into the secondary side span beam section and the side span beam section of the dynamic closure gap by using a punch nail, and finally a high-strength bolt is screwed into the splice plate.
The invention has the beneficial effects that:
the construction method for the side span pushing closure of the cable-stayed bridge is not influenced by temperature during implementation, the closure precision is high, the closure method is simple and convenient to operate, the construction efficiency is high, and the side span closure time is effectively shortened.
Drawings
FIG. 1 is a schematic view of the arrangement of the side span closure construction elevation in the invention;
FIG. 2 is a schematic plan view of the side span closure construction of the present invention;
FIG. 3 is a schematic view of the adjustment of the cross beam section axis of the closure gap minor edge of the present invention;
FIG. 4 is a schematic diagram of fine height adjustment of the closure gap secondary side span beam section.
In the above figures: 1 closing a secondary side span beam section of a closure opening; 2, a side span beam section; 3, a bridge deck crane; 4, stay cables; 5, a high bracket; 6, a pushing device; 7 a middle web plate; 8, pulling a chain block; 9 counter-force corbels; 10 a screw jack; 11, splicing plates; 12 high-strength bolts; and 13 punching the nail.
The invention will be further explained in detail with reference to the drawings and the embodiments;
Detailed Description
Example 1
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, an embodiment of the present invention provides a cable-stayed bridge side span pushing closure construction method, including the following steps: s001: firstly, storing the side span beam section 2 on the side span high support 5 and connecting the side span beam section and the side span high support into a whole, and hoisting the closure opening secondary side span beam section 1 to the closure opening when the main bridge cantilever is hoisted to the side span closure section; s002: the closure opening secondary side span beam section 1 is hoisted in place and then is connected with the previous beam section, the elevation of the closure opening secondary side span beam section 1 is adjusted to be close to that of the side span beam section 2 through a tension stay cable 4, the axis of the closure opening secondary side span beam section 1 is adjusted through a chain block 8, the side span beam section 2 is pushed through a pushing device 6 below the side span beam section 2 after the adjustment is in place, and the side span beam section 2 and the closure opening secondary side span beam section 1 are connected in sequence; s003: and finely adjusting the elevation of the closure opening secondary side span beam section 1 through a screw jack 10, and connecting the closure opening secondary side span beam section 1 and the side span beam section 2 through a splice plate 11 and a high-strength bolt 12 to finish the closure of the side span of the cable-stayed bridge.
After a side span high support 5 is built in advance, a bridge section 2 is stored on the side span high support 5, connection of the side span bridge section 2 is completed according to design and monitoring requirements, when a main bridge cantilever is hoisted to a closure opening secondary side bridge section 1, the closure opening secondary side bridge section 1 is hoisted according to a normal construction flow cantilever, and after the closure opening secondary side bridge section 1 is regulated by a bridge crane 3 to meet the design and monitoring requirements when the main bridge cantilever is hoisted to the closure opening, the closure opening secondary side bridge section is connected with a previous bridge section. The elevation of one end of the closure opening secondary side span beam section 1 at the closure opening is adjusted by tensioning a stay cable 4 of the closure opening secondary side span beam section 1, the deviation of the axis of the closure opening secondary side span beam section 1 is adjusted by a chain block 8, and after the adjustment is in place, the sliding side span beam section 2 is pushed by a pushing device 6 below the side span beam section 2, so that the side span beam section 2 is in direct connection with the closure opening secondary side span beam section 1. The elevation of the closure opening secondary side span beam section 1 is finely adjusted through the screw jack 10, the closure opening secondary side span beam section 1 and the side span beam section 2 can be connected through the splicing plate 11 and the high-strength bolt 12, and the closure of the side span of the cable-stayed bridge is completed. And then, primarily screwing and finally screwing the high-strength bolts 12 of the splicing plates 11 between the webs, welding beam sections, pouring transverse wet joint concrete, and after the wet joint strength meets the design requirement, tensioning the external cables of the closure opening to finish side span closure.
Example 2
Referring to fig. 1, in step S001, the closure secondary-side beam section 1 is hoisted in place and then connected to the previous beam section, at this time, one end of the closure secondary-side beam section 1 is consolidated, and the other end is a free end, and the elevation of the closure secondary-side beam section 1 is made to approach that of the side beam section 2 by adjusting the stay cable 4.
One end of the stay cable 4 is connected to a cable tower of the cable-stayed bridge, and the other end is connected to the closure opening secondary side span beam section 1.
Example 3
Referring to fig. 1, in step S001 based on embodiment 2, the elevation of the free end of the closure secondary-side beam segment 1 can be raised by tensioning the stay cable 4, and the elevation of the free end of the closure secondary-side beam segment 1 can be lowered by tensioning the stay cable 4 of the previous beam segment.
During actual construction, elevation control is performed through the stay cables of the closure opening secondary side span beam section 1 in the second tensioning.
Example 4
Referring to fig. 3, in step S002, two chain blocks 8 are connected to the middle web 7 of the closure opening secondary side span beam section 1 and the side span beam section 2, respectively, and then the two chain blocks 8 are pulled to make the axes of the closure opening secondary side span beam section 1 and the side span beam section 2 coincide with each other.
Two people respectively operate a chain block 8 to respectively draw the secondary side span beam section 1 and the side span beam section 2 of the closure opening close until the axes of the two side span beam sections are overlapped in the horizontal direction.
Example 5
Referring to fig. 1 and 2, in step S002 of the embodiment 5, after the thruster 6 is disposed below the side span beam section 2, the reaction seat of the thruster 6 is disposed on the track of the side span high bracket 5, and the side span beam section 2 is slid by the thruster.
During actual construction, the pushing device 6 is arranged at the position of the diaphragm plate of the side-span beam section 2, the joint of the cushion block and the beam section needs to be fixed, and the cushion block and the beam section are prevented from sliding relatively when being pushed. Meanwhile, a tetrafluoro sliding plate is arranged between the cushion block and the high support 5 rail, so that the friction coefficient is reduced, and the jacking force of the jacking device 6 is reduced during jacking.
Example 6
Referring to fig. 4, on the basis of embodiment 6, in step S003, a reaction bracket 9 is connected to each of the middle web 7 of the closure secondary side span beam segment 1 and the middle web 7 of the side span beam segment 2, and then a screw jack 10 is installed between the two reaction brackets 9, and the closure secondary side span beam segment 1 and the side span beam segment 2 are driven to perform elevation adjustment by being pushed between the two reaction brackets 9 by the screw jack 10.
During actual construction, before the height of the closure secondary side span beam section 1 is finely adjusted, the axis of the beam section and the distance in the bridge direction are adjusted in place, when the vertical height is adjusted, the splice plate 11 on the lower layer of the middle web 7 is installed, the punching nail 13 on one side of the side span beam section 2 is firstly driven in, then the force is applied to the screw jack 10, and the height of the closure secondary side span beam section 2 is adjusted.
Example 7
Referring to fig. 4, in step S003 of embodiment 6, the two ends of the splice plate 11 are respectively driven into the secondary side-span beam segment 1 and the secondary side-span beam segment 2 of the dynamic closure gap by the punch nails 13, and finally the high-strength bolt 12 is screwed into the splice plate 11.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (8)
1. A side span pushing closure construction method for a cable-stayed bridge is characterized by comprising the following steps:
s001: firstly, storing a side span beam section (2) on a side span high support (5) and connecting the side span beam section and the side span high support into a whole, and hoisting a closure opening secondary side span beam section (1) to a closure opening when a main bridge cantilever is hoisted to a side span closure section;
s002: the secondary side span beam section (1) of the closure opening is hoisted in place and then is connected with the previous beam section, the elevation of the secondary side span beam section (1) of the closure opening is adjusted to be close to that of the side span beam section (2) through a tension stay cable (4), the axis of the secondary side span beam section (1) of the closure opening is adjusted through a chain block (8), the side span beam section (2) is pushed through a pushing device (6) below the side span beam section (2) after the adjustment is in place, and the side span beam section (2) is sequentially connected with the secondary side span beam section (1) of the closure opening;
s003: the elevation of the closure opening secondary side span beam section (1) is finely adjusted through a screw jack (10), and the closure opening secondary side span beam section (1) and the side span beam section (2) are connected through a splicing plate (11) and a high-strength bolt (12), so that the closure of the side span of the cable-stayed bridge is completed.
2. The cable-stayed bridge side-span pushing closure construction method according to claim 1, characterized in that in step S001, the closure secondary side-span beam section (1) is hoisted in place and then connected with the previous beam section, at this time, one end of the closure secondary side-span beam section (1) is consolidated, the other end is a free end, and the elevation of the closure secondary side-span beam section (1) is close to that of the side-span beam section (2) by adjusting a stay cable.
3. The cable-stayed bridge side span pushing closure construction method according to claim 2, characterized in that in step S001, the elevation of the free end of the closure opening secondary side span beam section (1) can be raised by tensioning the stay cable (4), and the elevation of the free end of the closure opening secondary side span beam section (1) is lowered by releasing the stay cable (4) of the previous beam section.
4. The side span pushing closure construction method of the cable-stayed bridge according to claim 1, wherein in step S002, the closure opening secondary side span beam section (1) and the middle web plate (7) of the side span beam section (2) are respectively connected through two chain blocks (8), and then the two chain blocks (8) are oppositely pulled to make the axis of the closure opening secondary side span beam section (1) coincide with the axis of the side span beam section (2).
5. The cable-stayed bridge side span pushing closure construction method according to claim 4, characterized in that in step S002, the connection directions of the two chain blocks (8) are crossed with each other.
6. The cable-stayed bridge side span jacking closure construction method according to claim 1, characterized in that in step S002, after the jacking device (6) is arranged below the side span beam section (2), the reaction seat of the jacking device (6) is arranged on the track of the side span high bracket (5), and the side span beam section (2) is made to slide by the jacking device.
7. The cable-stayed bridge side span jacking closure construction method according to claim 1, characterized in that in step S003, a reaction bracket (9) is respectively connected to the middle web (7) of the closure secondary side span beam section (1) and the middle web (7) of the side span beam section (2), a screw jack (10) is installed between the two reaction brackets (9), and the closure secondary side span beam section (1) and the side span beam section (2) are driven to perform elevation adjustment by jacking the screw jack (10) between the two reaction brackets (9).
8. The side span pushing closure construction method of the cable-stayed bridge according to claim 7, wherein in step S003, the two ends of the splice plate (11) are respectively driven into the secondary side span beam section (1) and the side span beam section (2) of the dynamic closure opening by using the punch nails (13), and finally the high-strength bolt (12) is screwed into the splice plate (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010788860.1A CN112227204A (en) | 2020-08-07 | 2020-08-07 | Side span pushing closure construction method for cable-stayed bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010788860.1A CN112227204A (en) | 2020-08-07 | 2020-08-07 | Side span pushing closure construction method for cable-stayed bridge |
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| CN112227204A true CN112227204A (en) | 2021-01-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113255039A (en) * | 2021-05-26 | 2021-08-13 | 中铁大桥勘测设计院集团有限公司 | Method for determining main beam closure opening of steel truss girder cable-stayed suspension cable cooperation system bridge |
| CN113356064A (en) * | 2021-06-11 | 2021-09-07 | 中交二公局第二工程有限公司 | Mid-span closure-section-free pushing closure construction method for three-tower cable-stayed bridge |
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| CN113356064A (en) * | 2021-06-11 | 2021-09-07 | 中交二公局第二工程有限公司 | Mid-span closure-section-free pushing closure construction method for three-tower cable-stayed bridge |
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