CN210856938U - Inclined tower point steel-concrete combined section structure - Google Patents

Abstract

The utility model discloses a leaning tower point reinforced concrete combined section structure, the reinforced concrete combined section of its steel tower point is provided with horizontal limit structure, the foundatin plate that has the fluke by concrete tower column end section department and the limit stop who sets up on the foundatin plate constitute, fluke on the foundatin plate and the reinforcing bar net welded fastening in the concrete tower column end section, steel tower point reinforced concrete combined section position baffle and limit stop are hugged closely, the indoor ligature ordinary reinforcing bar that is provided with of reinforced concrete combined section case and the whole bundle extrusion hot polyethylene steel strand wires to both sides stretch-draw according to the principle of symmetry from the centre.

Description

Inclined tower point steel-concrete combined section structure

Technical Field

The utility model belongs to the technical field of bridge engineering, in particular to oblique tower point reinforced concrete joint section structure.

Background

Along with the continuous progress of social life, the requirement on the aesthetic property of the urban bridge is gradually improved, the urban grade can be greatly improved by one bridge and one scene, and the tower tip shape of the cable-stayed bridge can often play the role of drawing a dragon and touching the eyes. The steel-concrete combined inclined tower tip is adopted for molding, and although the molding is simple and attractive and the dead weight is light, the construction difficulty is increased due to the fact that the height is high and the supporting is difficult. Different from a common reinforced concrete combining section, the inclined tower tensioning end is arranged on the concrete top surface of the reinforced concrete combining section, after concrete shrinks, a steel plate at the tensioning end is easy to be hollowed, after tensioning, the steel plate deforms to cause prestress loss, and the steel plate and the concrete cannot be closely combined to easily cause corrosion of the steel plate, so that the structure safety and the durability are influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a leaning tower point reinforced concrete combined section structure, which can reduce the use of a temporary supporting structure by utilizing a main body structure; the deformation, the prestress loss and the corrosion possibility of the steel plate are reduced, and the safety and the durability of the structure are ensured.

The technical scheme is as follows:

the utility model provides a leaning tower point reinforced concrete combines section structure which characterized in that:

the steel-concrete combined section of the steel tower tip 4 is provided with a horizontal limiting structure, the foundation plate 2 with an anchor hook 6 at the tail section 1 of the concrete tower column and a limit stop 5 arranged on the foundation plate 2 form the anchor hook 6 on the foundation plate 2 and a reinforcing mesh in the tail section 1 of the concrete tower column are welded and fixed, a partition plate at the steel-concrete combined section of the steel tower tip is closely attached to the limit stop 5, and common binding steel bars and a whole bundle of extruded hot polyethylene steel strands 3 stretched from the middle to two sides according to the symmetry principle are arranged in the steel-concrete combined section box chambers 7 to 14.

The utility model discloses the technological effect who gains:

the foundation plate 2 with the anchor hooks 6 is arranged, so that the contact area of the box chamber partition plate of the steel tower tip 4 and the tail section 1 of the concrete tower column can be increased, and the tail section 1 of the concrete tower column is prevented from being damaged; set up limit stop 5 on 2 upper portions of foundatin plate, 2 lower parts of foundatin plate set up fluke 6, and when hot polyethylene steel strand wires 3 of pretension, the horizontal thrust of production passes to limit stop 5, again from last to transmitting to foundatin plate 2 and fluke 6 down, can avoid steel tower point 4 to produce horizontal displacement.

Drawings

FIG. 1 is a sectional elevation view of a tip reinforced concrete combined section provided by the present invention;

FIG. 2 is a horizontal cross-sectional view of a tip reinforced concrete combined section provided by the invention;

FIG. 3 is a schematic elevation view of a foundation plate construction provided by the present invention;

description of reference numerals:

1-concrete tower column tail section, 2-foundation plate, 3-whole bundle of extruded hot polyethylene steel stranded wires, 4-steel tower tip, 5-limit stop, 6-anchor hook and 7-14-steel-concrete combined section box chamber.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following describes the structure of the oblique tower tip reinforced concrete joint section provided by the present invention in detail with reference to the following embodiments. The following examples are intended to illustrate the invention and are not intended to limit the scope of the invention.

Example 1

The utility model provides a leaning tower point reinforced concrete combined section structure, the reinforced concrete combined section of its steel tower point 4 is provided with horizontal limit structure, by 1 department of concrete tower post end have foundatin plate 2 of fluke 6 and set up limit stop 5 on foundatin plate 2 and constitute, fluke 6 on the foundatin plate 2 and the reinforcing bar net welded fastening in the concrete tower post end 1, steel tower point reinforced concrete combined section position baffle and limit stop 5 are hugged closely, be provided with ligature ordinary reinforcing bar in the steel concrete combined section box room 7 to 14 and extrude hot polyethylene steel strand wires 3 to the whole bundle of both sides stretch-draw from the centre according to the principle of symmetry.

The construction method of the inclined tower tip reinforced concrete combined section structure comprises the following steps:

step one, implementing a horizontal limiting measure of a reinforced concrete combining section of an embedded steel tower tip 4, embedding a foundation plate 2 with an anchor hook 6 when binding a reinforcing steel bar of a tail section 1 of a concrete tower column, and arranging a limiting stop block 5 on the foundation plate 2.

Marking the central position of the foundation plate 2 on the steel bar net of the main tower according to the position of a partition plate in the reinforced concrete combined section, then aligning the foundation plate 2 according to the marked position, adjusting the level, the center and the elevation to meet the requirements, welding and fixing the anchor hooks 6 on the foundation plate 2 and the steel bar net in the concrete tower column tail section 1 together, and pouring concrete in the concrete tower column tail section 1.

And step two, after the concrete tower column tail section 1 is poured and reaches the designed strength and is roughened, hoisting the steel tower tip 4 to enable the partition plate at the steel-concrete combined section part of the steel tower tip to be closely attached to the limit stop 5, and binding common steel bars and the whole bundle of extruded hot polyethylene steel strands 3 in the steel-concrete combined section box chambers 7-14.

And step three, vertically limiting the reinforced concrete combined section of the steel tower tip 4, namely stretching and extruding the whole bundle of hot polyethylene steel strands 3 to 0.05 sigma con from the middle to two sides according to the principle of symmetry, wherein at least two bundles of hot polyethylene steel strands are stretched each time.

Pouring concrete in the steel-concrete combined section by adopting compensation shrinkage self-compaction concrete from a cantilever end, wherein the thickness of each layer of cloth is controlled to be 30cm, the height difference of the concrete in blanking holes is controlled to be 30cm, so that back pressure is formed to smoothly discharge air bubbles of the concrete, and the concrete is vibrated by adopting an inserted vibrator until the concrete overflows from the air exhaust holes and the grout outlet holes; and after the water is poured to the top plate, vibrating the top plate for 3s by adopting an attached vibrator.

Fifthly, treating a gap at the top of the reinforced concrete combination section, namely grouting a gap between a top plate and the concrete of 7 to 14 box chambers of the reinforced concrete combination section after 7 days, adopting a prestressed special pore grouting agent for grouting, performing comprehensive knocking inspection on the top plate through a small iron hammer after 7 days, and marking a sound range; when the existing grouting pipe cannot be used for grouting, the magnetic drill is used for drilling holes, and the residual gaps between the top plates 7 to 14 of the box chambers of the reinforced concrete combined section and the concrete are subjected to supplementary grouting.

Step six, after the equal strength is finished, grouting is finished and the designed strength is reached, tensioning the whole bundle of extruded hot polyethylene steel strands 3, wherein the tensioning sequence is as follows: 0 → initial stress → 0.3 σ con → 0.6 σ con → 1.0 σ con design tonnage → hold load for 5 minutes → anchor.

The construction method of the steel-concrete combined section of the inclined tower tip is applied to the double-cable-side single-tower cable-stayed bridge without the back cable, the main tower is a prestressed concrete inclined tower, the total height of an upper tower column is 71.6m, the included angle between the upper tower column and the ground is 60 degrees, the prestressed concrete part is 60m, the top of the prestressed concrete part is provided with a steel structure decorative tower, and the construction method passes through the steel-concrete combined section. By adopting the construction method of the reinforced concrete combined section, a large number of support auxiliary measures are not additionally added, the construction period is greatly shortened, the risk of internal structure cracks is avoided, and the possibility of steel plate deformation, prestress loss and steel plate corrosion is reduced through multiple post grouting.

As shown in fig. 1, a foundation plate 2 with an anchor hook 6 is arranged, so that the contact area between a box chamber partition plate of a steel tower tip 4 and a concrete tower column tail section 1 can be increased, and the concrete tower column tail section 1 is prevented from being damaged; set up limit stop 5 on 2 upper portions of foundatin plate, 2 lower parts of foundatin plate set up fluke 6, and when 3 to 0.05 sigma con of hot polyethylene steel strand wires of pretension, the horizontal thrust of production passes to limit stop 5, from last transmission to foundatin plate 2, fluke 6 down again, avoids steel tower point 4 to produce horizontal displacement. The pre-tensioned hot polyethylene steel strand 3 can resist the overturning moment generated by steel of the overhanging part of the steel tower tip 4 and concrete of the combined section.

As shown in fig. 1 and 2, the steel-concrete joint section is cast by compensating shrinkage self-compacting concrete from the cantilever end in the sequence of the box chambers 7, 8, 9, 10, 11, 12, 13, 14 of the steel-concrete joint section, and if the concrete is not cast in the sequence, the cast concrete is affected by the bending moment generated by the casting of the cantilever end concrete once the concrete is initially set, and the cast concrete can crack.

The top plate of the steel-concrete combined section of the tower tip 4 is vibrated by the attached vibrator, and the concrete is vibrated by the inserted vibrator according to the test section result, so that bubbles discharged by the concrete are easy to form large disconnected bubbles on the top plate when the concrete is poured to the top plate, and the steel and concrete combination is influenced; the principle of the compensation shrinkage concrete is that the concrete shrinks firstly and then expands, and the mode of twice grouting is adopted, so that the gap can be effectively reduced, and the steel-concrete combination quality is greatly improved.

The present invention is not limited to the above-described examples, and various changes can be made without departing from the spirit of the present invention within the knowledge range of those skilled in the art.

Claims (1)

1. The utility model provides a leaning tower point reinforced concrete combines section structure which characterized in that: the steel-concrete combined section of the steel tower tip (4) is provided with a horizontal limiting structure, and consists of a foundation plate (2) with an anchor hook (6) at the tail section (1) of the concrete tower column and a limit stop block (5) arranged on the foundation plate (2), the anchor hook (6) on the foundation plate (2) is welded and fixed with a reinforcing mesh in the tail section (1) of the concrete tower column, a partition plate at the steel-concrete combined section of the steel tower tip is closely attached to the limit stop block (5), and a binding common steel bar and a whole bundle of hot extrusion tension polyethylene stranded wires (3) from the middle to two sides according to the symmetrical principle are arranged in a steel-concrete combined section box.

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