Bracket-free rapid construction method for hollow pier partition plate of bridge
1. A bracket-free rapid and efficient construction method for a hollow pier partition plate of a bridge is characterized by comprising the following steps:
a, constructing a reinforced concrete support bracket while constructing a hollow bridge pier;
when a reinforcement cage of a hollow bridge pier (1) is bound, a reinforcement cage of a reinforced concrete support bracket (3) is bound together, two reinforced concrete support brackets (3) which are opposite left and right are arranged at a chamfer position at the top of the hollow bridge pier (1), the reinforcement cage of the reinforced concrete support bracket (3) is embedded and bound in the reinforcement cage of the hollow bridge pier (1) and is bound with the reinforcement cage of the hollow bridge pier (1) integrally, then integral casting is carried out, and a pit is reserved at the top of the hollow bridge pier (1) after casting; the exposed top surface of the reinforced concrete support bracket (3) is consistent with the designed elevation of the bridge hollow pier (1), and the side wall of the reinforced concrete support bracket (3) is flush with the side wall of the bridge hollow pier (1);
b, hoisting the reinforced concrete precast slab into a pit at the top of the hollow bridge pier;
hoisting a plurality of reinforced concrete precast slab steel bars (4) to the top of the bridge hollow pier (1) one by one through a crane, and placing the steel bars into a pit at the top of the bridge hollow pier (1) for splicing, so that two ends of each reinforced concrete precast slab (4) are respectively lapped with the corresponding reinforced concrete support bracket (3), the inner side end of a steel reinforcement cage of the cast-in-place reinforced concrete support bracket (3) is ensured to extend inwards to exceed the lapping position, and the top surface of each reinforced concrete precast slab (4) is consistent with the design elevation of the bridge hollow pier (1);
c, filling mortar;
the lap joints of the reinforced concrete precast slabs (4) and the reinforced concrete support bracket (3) at the splicing positions of all the reinforced concrete precast slabs (4) are filled with joint filling mortar;
and D, constructing the hollow pier partition of the bridge by taking the reinforced concrete precast slab (4) as a construction platform.
2. The bracket-free rapid and efficient construction method for the hollow pier partition plate of the bridge according to claim 1, which is characterized in that: the steel reinforcement cage of the reinforced concrete support bracket (3) is formed by binding a main reinforcement (3a), a bent reinforcement (3b), a horizontal reinforcement (3c) and a first stirrup (3 d); the main reinforcements (3a) are in a bracket shape with an unsealed lower end formed by bending steel bars, and the main reinforcements (3a) are arranged at equal intervals along the length direction; the bent-up steel bar (3b) has the contour consistent with that of the main bar (3a) except that the corner at the top of the inner side is obliquely arranged, and is bound together with the main bar (3 a); the horizontal steel bars (3c) are vertically bound along the upper edge and the lower oblique edge of the bracket shape at equal intervals to connect all the main bars (3a) in series; the first stirrups (3d) are used for hooping and binding all the main reinforcements (3a) in a ring sleeve manner at equal intervals from top to bottom.
3. The bracket-free rapid and efficient construction method for the hollow pier partition plate of the bridge according to claim 2, which is characterized in that: the steel reinforcement framework of the reinforced concrete precast slab (4) is formed by welding an upper-layer longitudinal steel bar (4a), a lower-layer longitudinal steel bar (4b), a second stirrup (4c) and a hanging ring (4d), and the upper-layer longitudinal steel bar (4a) and the lower-layer longitudinal steel bar (4b) are sleeved in the second stirrup (4c) in a ring mode.
4. The bracket-free rapid and efficient construction method for the hollow pier partition plate of the bridge according to claim 3, characterized in that: the diameter of the second stirrup (4c), the diameter of the upper-layer longitudinal steel bar (4a) and the diameter of the lower-layer longitudinal steel bar (4b) are sequentially increased and respectively are phi 10mm, phi 12mm and phi 22mm, and the diameter of the steel bar of the hanging ring (4d) is phi 20 mm.
5. The bracket-free rapid and efficient construction method for the hollow pier partition plate of the bridge according to claim 3, characterized in that: the diameters of the main reinforcement (3a) and the bent reinforcement (3b) are both phi 22mm, the diameter of the horizontal reinforcement (3c) is phi 16mm, and the diameter of the first stirrup (3d) is phi 12 mm.
Background
The construction of the bridge high pier is an important part in the bridge construction, and the construction of the hollow pier partition plate is a difficult point and a key point in the construction process of the bridge high pier. Combine shown in fig. 1-3, high mound 1 of bridge adopts hollow mound, erects hollow mound baffle 2 between two sections adjacent hollow mounds from top to bottom, need set up manhole 2a in the position department placed in the middle of hollow mound baffle 2a bit, need not set up the manhole on hollow mound baffle 2a bit, both ends are provided with chamfer 1a about hollow mound top corresponds hollow mound baffle 2.
At present, the construction of the hollow pier partition of the domestic bridge usually adopts a full support, a pre-embedded I-shaped steel or a bracket support as a support system of the hollow pier partition, but all face the difficulties of difficult support installation and dismantling, high safety risk and large labor intensity. How to complete the construction of the hollow pier partition plate of the bridge quickly, safely and efficiently becomes a problem which needs to be researched and solved urgently by bridge construction technical workers.
Disclosure of Invention
The invention aims to solve the problem that a support system for the construction of the hollow pier partition plate of the bridge is difficult to erect and dismantle, and provides a quick, safe, efficient and reliable support-free construction method for the hollow pier partition plate of the bridge, which improves the construction efficiency and reduces the construction cost of the support system.
Therefore, the technical scheme adopted by the invention is as follows: a bracket-free rapid and efficient construction method for a hollow pier partition plate of a bridge comprises the following steps:
a, constructing a reinforced concrete support bracket while constructing a hollow bridge pier;
the method comprises the following steps that when a reinforcement cage of a hollow bridge pier is bound, reinforcement cages of reinforced concrete support brackets are bound together, two reinforced concrete support brackets which are opposite left and right are arranged at the position of a chamfer at the top of the hollow bridge pier, the reinforcement cages of the reinforced concrete support brackets are embedded into the reinforcement cage bound on the hollow bridge pier and are bound with the reinforcement cage of the hollow bridge pier integrally, then integral pouring is carried out, and a pit is reserved at the top of the hollow bridge pier after pouring; the exposed top surface of the reinforced concrete support bracket is consistent with the designed elevation of the bridge hollow pier, and the side wall of the reinforced concrete support bracket is flush with the side wall of the bridge hollow pier;
b, hoisting the reinforced concrete precast slab into a pit at the top of the hollow bridge pier;
hoisting a plurality of reinforced concrete precast slabs to the top of the hollow bridge pier one by one through a crane, and placing the precast slabs into a pit at the top of the hollow bridge pier for splicing, so that two ends of each reinforced concrete precast slab are respectively lapped with the corresponding reinforced concrete support bracket, the inner side end of a reinforcement cage of the cast-in-place reinforced concrete support bracket is ensured to extend inwards to a position beyond the lapping position, and the top surface of each reinforced concrete precast slab is consistent with the designed elevation of the hollow bridge pier;
c, filling mortar;
the splicing positions of all the reinforced concrete prefabricated plates and the lap joints of the reinforced concrete prefabricated plates and the reinforced concrete support brackets are filled with gap filling mortar;
and D, constructing the hollow pier partition of the bridge by taking the reinforced concrete precast slab as a construction platform.
Preferably, the steel reinforcement cage of the reinforced concrete support bracket is formed by binding a main reinforcement, a bent reinforcement, a horizontal reinforcement and a first stirrup; the main reinforcements are in a bracket shape with the lower end not closed formed by bending steel bars, and the main reinforcements are arranged at equal intervals along the length direction; the bent-up steel bars are obliquely arranged except the corners at the top of the inner sides, the outlines of the bent-up steel bars are consistent with the outlines of the main bars, and the bent-up steel bars are bound together along with the main bars; the horizontal steel bars are vertically bound at equal intervals along the upper edge and the lower oblique edge of the bracket shape to connect all the main bars in series; and the first stirrups hoop all the main reinforcement rings at equal intervals from top to bottom. The reinforcement is combined with a bent reinforcement, a horizontal reinforcement and a first stirrup to be bound to form a reinforcement cage, the bent reinforcement is additionally provided with a corner inclination at the top of the inner side and is bound with a main reinforcement in a doubling manner, so that the stress capacity at the splicing position is better ensured, and the reinforcement cage can bear better shearing force; the horizontal steel bars are connected with all the main bars in series, the first stirrups are used for hooping and binding all the main bar rings, and the whole steel reinforcement cage is very good in strength and strong in bearing capacity.
Preferably, the reinforcement framework of the reinforced concrete precast slab is formed by welding an upper longitudinal reinforcement, a lower longitudinal reinforcement, a second stirrup and a hanging ring, and the second stirrup surrounds the upper longitudinal reinforcement and the lower longitudinal reinforcement. The second stirrups are used as main steel reinforcement frameworks of the reinforced concrete prefabricated slab, the upper-layer longitudinal steel bars and the lower-layer longitudinal steel bars are connected into a whole, the structural design is ingenious, and arrangement of the steel bars is facilitated.
More preferably, the diameter of the second stirrup, the diameter of the upper-layer longitudinal steel bar and the diameter of the lower-layer longitudinal steel bar are sequentially increased to be phi 10mm, phi 12mm and phi 22mm respectively, and the diameter of the steel bar of the hanging ring is phi 20 mm.
More preferably, the diameters of the main reinforcement and the bent reinforcement are both phi 22mm, the diameter of the horizontal reinforcement is phi 16mm, and the diameter of the first stirrup is phi 12 mm.
The invention has the beneficial effects that: the supporting system can guarantee that during construction of the hollow pier partition plates, construction of the hollow pier partition plates without supports is achieved, the problem that a supporting system of the hollow pier partition plates is difficult to erect is effectively solved, supporting brackets and the prefabricated plates are integrally formed after construction is completed, the supporting system does not need to be dismantled manually, construction efficiency of the hollow pier partition plates is improved, labor and material costs of the supporting system are reduced, and the supporting system has important practical significance for safe and efficient construction of the hollow pier partition plates.
Drawings
FIG. 1 is an elevation view of a bridge.
Fig. 2 is a sectional view of the hollow pier of the bridge.
Fig. 3 is a cross-sectional view of a hollow pier spacer.
Fig. 4 is a schematic structural diagram of the invention.
Fig. 5 is a schematic elevation view of a reinforcement cage of a cast-in-place reinforced concrete support bracket.
Fig. 6 is an exploded view of fig. 5.
Fig. 7 is a perspective view of a reinforced concrete precast slab.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
referring to fig. 4 to 7, a bracket-free rapid and efficient construction method for a hollow pier partition of a bridge comprises the following steps:
and step A, constructing a reinforced concrete support bracket while constructing the hollow bridge pier.
When the reinforcement cages of the hollow bridge pier 1 are bound, the reinforcement cages of the reinforced concrete support brackets 3 are bound together, and two reinforced concrete support brackets 3 which are opposite to each other left and right are arranged at the chamfer angle position at the top of the hollow bridge pier 1.
The reinforcement cage of the reinforced concrete support bracket 3 is embedded and bound in the reinforcement cage of the hollow bridge pier 1 and integrally bound with the reinforcement cage of the hollow bridge pier 1, then the integral casting is carried out, and the pit is reserved at the top of the hollow bridge pier 1 after the casting.
The exposed top surface of the reinforced concrete support bracket 3 is consistent with the designed elevation of the bridge hollow pier 1, and the side wall of the reinforced concrete support bracket 3 is flush with the side wall of the bridge hollow pier 1.
When the reinforcement cage of hollow mound 1 of ligature bridge, just with the reinforcement cage embedding ligature of two reinforced concrete support brackets 3 wherein to pour integrative after with the integrative ligature of reinforcement cage of hollow mound 1 of bridge, its purpose is to improve the support intensity of the top chamfer position department of hollow mound 1 of bridge, prepare for subsequent reinforced concrete prefabricated plate 4's installation, will support the bracket and directly imbed the ligature and pour in hollow mound of bridge, neither influence the appearance of hollow mound of bridge, can increase support intensity again, realize concealed installation, need not demolish after the construction of hollow mound baffle of bridge is accomplished.
Preferably, the reinforcement cage of the cast-in-place reinforced concrete support bracket 3 is formed by binding a main reinforcement 3a, a bent reinforcement 3b, a horizontal reinforcement 3c and a first stirrup 3 d. The main reinforcement 3a is a cow leg shape with an unsealed lower end formed by bending a steel bar, and the main reinforcements 3a are arranged at equal intervals along the length direction. The curved reinforcing steel bar 3b is consistent with the outline of the main bar 3a except that the inner side top corner is inclined, and the main bar 3a is reinforced along with the doubling and binding of the main bar 3a, and the inner side top corner is inclined at the same time, so that the stress capacity of the splicing position is better, and the better shearing force can be borne. The horizontal reinforcing bars 3c are vertically bound along the upper and lower diagonal edges of the bracket shape at equal intervals, thereby connecting all the main bars 3a in series. All main muscle 3a ring covers banding from the top down equidistance interval ground of first stirrup 3d, and the first stirrup 3d profile size on upper portion is unanimous, and the first stirrup 3d profile of lower part diminishes gradually.
Preferably, the diameters of the main reinforcement 3a and the bent-up reinforcement 3b are both 22mm, the diameter of the horizontal reinforcement 3c is 16mm, and the diameter of the first stirrup 3d is 12 mm.
And step B, hoisting the reinforced concrete precast slab into a pit at the top of the hollow bridge pier.
Hoisting a plurality of reinforced concrete precast slabs 4 to the top of the hollow bridge pier 1 one by one through a crane, and placing the precast slabs into a pit at the top of the hollow bridge pier 1 for assembly, so that the two ends of each reinforced concrete precast slab 4 are respectively lapped with the corresponding reinforced concrete support bracket 3, the inner side end of a reinforcement cage of the cast-in-place reinforced concrete support bracket 3 is ensured to extend inwards to a position beyond the lapping position, the top surface of each reinforced concrete precast slab 4 is consistent with the design elevation of the hollow bridge pier 1, and the whole construction support system is ensured to be matched with the design size of the hollow bridge pier 1.
The steel reinforcement framework of the reinforced concrete precast slab 4 is formed by welding an upper longitudinal steel reinforcement 4a, a lower longitudinal steel reinforcement 4b, a second stirrup 4c and a hanging ring 4 d. The upper longitudinal steel bars 4a and the lower longitudinal steel bars 4b are sleeved in the second stirrups 4c, and two lifting rings 4d are arranged and are respectively positioned at two ends of the reinforced concrete precast slab 4, so that the hoisting is convenient.
Preferably, the diameter of the second stirrup 4c, the diameter of the upper-layer longitudinal reinforcement 4a, and the diameter of the lower-layer longitudinal reinforcement 4b are sequentially increased to be phi 10mm, phi 12mm, and phi 22mm, respectively, and the reinforcement diameter of the suspension ring 4d is phi 20 mm.
In view of the need for a manhole at the center of some hollow pier bulkheads 2, there is no need for a manhole on some hollow pier bulkheads 2. And the two reinforced concrete precast slabs are respectively provided with half manhole holes which are closed to form a complete manhole hole.
And step C, filling mortar.
And joint filling mortar is filled at the splicing positions of all the reinforced concrete prefabricated plates 4 and the lap joints of the reinforced concrete prefabricated plates 4 and the reinforced concrete support brackets 3.
And D, constructing the hollow pier partition of the bridge by taking the reinforced concrete precast slab 4 as a construction platform.
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