CN112195783A - Assembly type bracket mounting structure for cable tower beam construction and prepressing method - Google Patents
Assembly type bracket mounting structure for cable tower beam construction and prepressing method Download PDFInfo
- Publication number
- CN112195783A CN112195783A CN202010963597.5A CN202010963597A CN112195783A CN 112195783 A CN112195783 A CN 112195783A CN 202010963597 A CN202010963597 A CN 202010963597A CN 112195783 A CN112195783 A CN 112195783A
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- bracket
- cable tower
- tower
- mounting structure
- deformed steel
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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
- E01D11/02—Suspension 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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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 an assembled bracket mounting structure and a prepressing method for cable tower beam construction, wherein 4 pieces of finish-rolled deformed steel bars and 4 pieces of pin rods are arranged at the designed mounting position of a bracket on a cable tower, the finish-rolled deformed steel bars and the pin rod bracket penetrate through a bracket side plate, the bracket is fixed on a tower body through the finish-rolled deformed steel bars, and the pin rods provide a supporting force; before the bracket is installed on the cable tower, the bracket is subjected to a pre-pressing test on a test pier on the ground through the jack and the counter-force beam, and then the bracket is installed on the cable tower after being detected to be qualified, so that the complicated procedures and safety risks of high-altitude pre-pressing can be avoided.
Description
Technical Field
The invention belongs to the technical field of bridge construction, relates to beam construction of a suspension bridge cable tower, and particularly relates to an assembly type bracket mounting structure for cable tower beam construction and a method for pre-pressing a bracket.
Background
The pylons at each end of the suspension bridge typically include two pylons with a cross-beam disposed therebetween. Because the cross beam is high, the construction is usually carried out by adopting a high-altitude bracket method, brackets are respectively arranged on the opposite sides of the certain height positions of the two tower columns, and a bearing beam is erected between the brackets to serve as a main bearing structure of the bracket.
In the prior construction, a bracket is generally installed by embedding a steel plate or section steel in tower column concrete, and the bracket is welded with the embedded steel plate or section steel when being erected. Such a mounting structure has problems such as: the construction safety risk of the overhead welding operation is high, and the quality of the welding seam is difficult to control; the temperature is high when the bracket is welded and cut off, concrete of a tower body is easy to crack, appearance and entity quality control of the cable tower are not facilitated, the later repair workload is large, and an embedded part is easy to form a corrosion channel to influence the durability; the bracket and the embedded part are all thrown in one time, and can not be used circularly after being cut off, thereby causing material waste; the stress of the bracket can not be effectively transferred to the tower body, and the bearing capacity is limited.
In addition, the corbel is usually pre-pressed after being installed to detect its bearing capacity. At present, a stacking preloading method is often adopted, a large number of preloading loads need to be hoisted to high altitude, the process is complicated, and the safety is poor.
Disclosure of Invention
The invention aims to provide an assembly type bracket mounting structure and a prepressing method for cable tower beam construction, aiming at solving the problems of the existing welding type bracket and the prepressing method, so as to reduce the construction risk, improve the construction efficiency and ensure the construction quality.
The invention provides an assembly type bracket mounting structure for construction of a cable tower beam, which comprises a vertically arranged side plate, a horizontally arranged top plate welded on the side plate, and at least two support plates vertical to the side plate and the top plate welded between the side plate and the top plate, and is characterized in that: 4 pin rod jacks and 4 deformed steel bar jacks are arranged on the side plate below the top plate; the bracket design mounted position on the cable tower corresponds each round pin jack and screw-thread steel jack on the bracket curb plate and is equipped with round pin stick and the finish rolling screw-thread steel that runs through the body of the tower respectively, body one side is hugged closely to the curb plate of bracket, and the round pin jack on the curb plate is passed to the one end of each round pin stick, and the other end is outstanding to the opposite side of body of the tower, and the screw-thread steel jack on the curb plate is passed to the one end of each finish rolling screw-thread steel, and the other end is outstanding to the body of the tower opposite side, and fastening nut is installed respectively.
The invention provides a prepressing method of an assembled bracket for construction of a cable tower beam, which is characterized by comprising the following steps of:
(1) pouring two concrete test piers, arranging a counter-force beam between the two test piers, and respectively pouring two ends of the counter-force beam into the pier body concrete;
(2) simulating a mounting structure of a bracket on the cable tower, and mounting a bracket above the counter-force beam and on the opposite sides of the two test piers respectively;
(3) a bearing beam is erected between the two brackets, and two ends of the bearing beam are respectively supported on top plates of the two brackets;
(4) jacks are respectively and vertically arranged on the top surfaces of two ends of the bearing beam, a shoulder pole beam is arranged on the top of each jack, and two ends of each shoulder pole beam are respectively connected with the counter-force beams through pull rods;
(5) starting the jack to push the shoulder pole beam upwards, providing counter force through the counter-force beam and applying pressure to the bracket; and (4) continuing for a period of time after the pressure reaches the design load of the bracket, observing whether the bracket deforms or not, and meeting the design requirement if no deformation exists.
The assembled bracket mounting structure adopted by the invention has no welding and cutting operation in the bracket mounting process, has high construction efficiency and safety, and is beneficial to control of concrete entity and appearance quality of the tower body; the stress of the bracket can be effectively transferred to the concrete of the pier body through the pin rod, the respective characteristics of the concrete and the steel structure are fully exerted, and the bearing capacity is strong; the bracket can be used in a turnover mode after being detached, and construction cost is saved.
According to the invention, by utilizing the characteristic that the assembled bracket is convenient to mount and dismount, the bracket is subjected to a bearing force pre-pressing test on a lower test pier, the pressure is provided by the jack, the counter force is provided by the counter-force beam, the structure is simple, the stress is clear, the bearing force of the bracket can be rapidly detected, the detection result is accurate, and the safety is high. The bracket with the bearing capacity meeting the requirement can be directly installed on a cable tower and a high pier for use, and the complicated procedures of high-altitude prepressing and the safety risks of the high-altitude prepressing are avoided.
Drawings
FIG. 1 is a side elevational view of the corbel mounting structure of the present invention;
FIG. 2 is a front elevational view of the corbel mounting structure of the present invention;
FIG. 3 is a side elevational view of the corbel preloading structure of the present invention;
fig. 4 is a transverse elevational view of the corbel preloading structure of the present invention.
Detailed Description
As shown in fig. 1 and 2, the fabricated bracket mounting structure suitable for the construction of the cable tower beam comprises a side plate 1 which is vertically arranged, a top plate 2 which is horizontally arranged is welded on the side plate, and at least two support plates 3 which are vertical to the side plate and the top plate are welded between the side plate 1 and the top plate 2; 4 pin rod jacks 4 and 4 deformed steel bar jacks 5 are arranged on the side plate below the top plate; the bracket design mounted position on cable tower 15 corresponds each round pin jack and screw-thread steel jack on the bracket curb plate and is equipped with round pin 6 and the finish rolling screw-thread steel 7 that run through the body of the tower respectively, body one side is hugged closely to the curb plate of bracket, and round pin jack 4 on the curb plate is passed to the one end of each round pin 6, and the other end is outstanding to the opposite side of body of the tower, and screw-thread steel jack 5 on the curb plate is passed to the one end of each finish rolling screw-thread steel 7, and the other end is outstanding to the body of the tower opposite side, and fastening nut 8 is installed respectively at the both ends of.
In the specific implementation of the invention, in order to ensure the stress balance and the structural stability of the bracket, the 4 pin rod jacks on the bracket side plate are arranged on two sides of the vertical central line of the bracket side plate in a pairwise symmetry manner, and the 4 deformed steel bar jacks are also arranged on two sides of the vertical central line of the bracket side plate in a pairwise symmetry manner.
In the concrete implementation of the invention, when the cable tower is constructed, 4 pin rod mounting holes 9 and 4 deformed steel bar mounting holes 10 are preset in the concrete of the tower body according to the designed mounting position of the bracket and the distribution structure of the pin rod jacks and the deformed steel bar jacks on the bracket side plate; 125mm seamless steel pipes are adopted in the pin rod mounting holes, and phi is 63mm seamless steel pipes are adopted in the deformed steel bar mounting holes and are embedded into the tower body concrete. When the bracket is installed, the pin 6 and the finish-rolled deformed steel bar 7 are respectively and movably inserted into the pin mounting holes 9 and the deformed steel bar mounting holes 10.
In the specific implementation of the invention, the difference between the diameter of the pin and the inner diameter of the pin mounting hole corresponding to the pin can be set to be smaller than the difference between the diameter of the finish-rolled deformed steel bar and the inner diameter of the deformed steel bar mounting hole corresponding to the finish-rolled deformed steel bar. The structure is arranged, so that the vertical bearing capacity acting on the bracket is born by the pin, the vertical bending moment acting on the bracket is resisted and balanced by the horizontal finish-rolled deformed steel bar, the concrete fully exerts the characteristics of high compressive strength and the finish-rolled deformed steel bar fully exerts the characteristics of high tensile strength, the structure stress is clear and definite, and the design and the checking are convenient.
In order to ensure that the pin mounting holes and the deformed steel bar mounting holes can be accurately positioned during construction of the cable tower, two vertically arranged positioning steel plates 11 can be pre-embedded in concrete of a tower body during concrete pouring of the cable tower, positioning holes corresponding to the pin inserting holes and the deformed steel bar inserting holes in the bracket side plates are formed in each positioning steel plate, and two ends of each pin mounting hole and two ends of each deformed steel bar mounting hole respectively penetrate through the corresponding positioning holes in the two positioning plates.
When cable tower crossbeam construction bracket installation, the bracket spandrel girder both ends are supported on the bracket between two pylons, for guaranteeing that the spandrel girder installation is stable, can two brackets of bracket roof top surface welding and roof and the equal vertically baffle 12 of curb plate have a determining deviation and symmetry setting in the vertical central line both sides of curb plate between two baffle 12. When the bracket is erected, the end part of the bearing beam is supported between the two baffle plates on the top plate.
The bracket adopted by the invention is a heavy bracket, and hoisting equipment is required during installation. For the convenience of hoisting, opposite-penetrating hoisting holes 13 can be formed in the two baffles and are used for connecting hoisting ropes during hoisting.
Further, in order to improve the structural strength of the whole bracket, two stiffening plates 14 can be welded between the top surface of the top plate of the bracket and the outer side of each baffle plate, and two stiffening plates can be welded between the bottom surface of the top plate and the two supporting plates.
Usually, after the bracket is installed on the cable tower, the bracket is pre-pressed before the construction of the cross beam for detecting whether the bearing capacity of the bracket meets the requirement. But the high-altitude prepressing process is complicated and the safety is poor.
The invention utilizes the characteristic that the assembly bracket mounting structure is convenient to mount and dismount, carries out prepressing detection on the bearing capacity of the bracket on the ground in advance, and then mounts the bracket on the cable tower after the test meets the requirement, thereby avoiding the problems of inconvenient high-altitude prepressing construction and poor safety. The specific method comprises the following steps:
(1) two concrete test piers 16 are poured on the ground, the lower ends of the test piers are close to, a counter-force beam 17 is arranged between the two test piers, and two ends of the counter-force beam 17 are respectively poured into the concrete of the pier body;
(2) according to an assembly type mounting structure of a bracket on a cable tower, pin rod mounting holes and finish rolling deformed steel bar mounting holes are reserved in pier body concrete above a counterforce beam 17, and the opposite sides of two test piers 16 are respectively provided with a bracket through a pin rod 6 and a finish rolling deformed steel bar 7;
(3) a bearing beam 18 is erected between the two brackets, and two ends of the bearing beam 18 are respectively supported on the top plates 2 of the two brackets;
(4) jacks 19 are respectively and vertically arranged on the top surfaces of two ends of the bearing beam 18, a shoulder pole beam 20 is arranged on the top of each jack 19, and two ends of each shoulder pole beam 20 are respectively connected with the reaction beam 17 through pull rods 21;
(5) starting the jack 19 to push the shoulder pole beam 20 upwards, providing counter force through the counter force beam and applying pressure to the bracket; and (4) continuing for a period of time after the pressure reaches the design load of the bracket, observing whether the bracket deforms or not, and meeting the design requirement if no deformation exists.
After the bracket qualified in the test is installed on the cable tower, the pre-pressing is not needed, and the bracket can be directly used for beam construction.
Claims (9)
1. The utility model provides an assembled bracket mounting structure for construction of cable tower crossbeam, the bracket includes the curb plate of a vertical setting, the roof that welds a level setting on the curb plate, welds two at least and curb plate and the equal vertically backup pad of roof, its characterized in that between curb plate and roof: 4 pin rod jacks and 4 deformed steel bar jacks are arranged on the side plate below the top plate; the bracket design mounted position on the cable tower corresponds each round pin jack and screw-thread steel jack on the bracket curb plate and is equipped with round pin stick and the finish rolling screw-thread steel that runs through the body of the tower respectively, body one side is hugged closely to the curb plate of bracket, and the round pin jack on the curb plate is passed to the one end of each round pin stick, and the other end is outstanding to the opposite side of body of the tower, and the screw-thread steel jack on the curb plate is passed to the one end of each finish rolling screw-thread steel, and the other end is outstanding to the body of the tower opposite side, and fastening nut is installed respectively.
2. The fabricated corbel mounting structure for cable tower beam construction according to claim 1, wherein: 4 round pin stick jacks on the bracket curb plate pairwise symmetry set up in bracket curb plate vertical center line both sides, and 4 screw-thread steel jacks also pairwise symmetry set up in bracket curb plate vertical center line both sides.
3. The fabricated corbel mounting structure for cable tower beam construction according to claim 1, wherein: 4 pin rod mounting holes and 4 deformed steel bar mounting holes are preset in concrete of a tower body of the cable tower, and the pin rod mounting holes and the deformed steel bar mounting holes are all seamless steel tubes; each pin rod and the finish rolling deformed steel bar are movably inserted into each pin rod mounting hole and each deformed steel bar mounting hole respectively.
4. The fabricated corbel mounting structure for cable tower beam construction according to claim 3, wherein: and the difference value between the diameter of the pin rod and the inner diameter of the pin rod mounting hole corresponding to the pin rod is smaller than the difference value between the diameter of the finish-rolled deformed steel bar and the inner diameter of the deformed steel bar mounting hole corresponding to the finish-rolled deformed steel bar.
5. The fabricated corbel mounting structure for cable tower beam construction according to claim 3, wherein: two vertically-arranged positioning steel plates are pre-buried in concrete of a tower body of the cable tower, positioning holes corresponding to the pin jacks and the deformed steel jacks on the bracket side plate are formed in each positioning steel plate, and two ends of each pin mounting hole and two ends of each deformed steel mounting hole respectively penetrate through corresponding positioning holes in the two positioning plates.
6. The fabricated corbel mounting structure for cable tower beam construction according to claim 1, wherein: two baffles which are perpendicular to the top plate and the side plate are welded on the top surface of the bracket top plate, and a certain distance is reserved between the two baffles and symmetrically arranged on two sides of the vertical central line of the side plate.
7. The fabricated corbel mounting structure for cable tower beam construction according to claim 6, wherein: and opposite-penetrating lifting holes are formed in the two baffles.
8. The fabricated corbel mounting structure for cable tower beam construction according to claim 6, wherein: two stiffening plates are welded between the top surface of the top plate of the bracket and the outer side of each baffle and between the bottom surface of the top plate and the two supporting plates respectively.
9. A pre-pressing method of an assembled bracket for constructing a cable tower beam is characterized by comprising the following steps:
(1) pouring two concrete test piers, arranging a counter-force beam between the two test piers, and respectively pouring two ends of the counter-force beam into the pier body concrete;
(2) simulating a mounting structure of a bracket on the cable tower, and mounting a bracket above the counter-force beam and on the opposite sides of the two test piers respectively;
(3) a bearing beam is erected between the two brackets, and two ends of the bearing beam are respectively supported on top plates of the two brackets;
(4) jacks are respectively and vertically arranged on the top surfaces of two ends of the bearing beam, a shoulder pole beam is arranged on the top of each jack, and two ends of each shoulder pole beam are respectively connected with the counter-force beams through pull rods;
(5) starting the jack to push the shoulder pole beam upwards, providing counter force through the counter-force beam and applying pressure to the bracket; and (4) continuing for a period of time after the pressure reaches the design load of the bracket, observing whether the bracket deforms or not, and meeting the design requirement if no deformation exists.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010963597.5A CN112195783A (en) | 2020-09-14 | 2020-09-14 | Assembly type bracket mounting structure for cable tower beam construction and prepressing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010963597.5A CN112195783A (en) | 2020-09-14 | 2020-09-14 | Assembly type bracket mounting structure for cable tower beam construction and prepressing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112195783A true CN112195783A (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010963597.5A Pending CN112195783A (en) | 2020-09-14 | 2020-09-14 | Assembly type bracket mounting structure for cable tower beam construction and prepressing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855639A (en) * | 2022-06-15 | 2022-08-05 | 保利长大工程有限公司 | High altitude cable tower crossbeam construction bracket pre-compaction subassembly |
-
2020
- 2020-09-14 CN CN202010963597.5A patent/CN112195783A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855639A (en) * | 2022-06-15 | 2022-08-05 | 保利长大工程有限公司 | High altitude cable tower crossbeam construction bracket pre-compaction subassembly |
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