CN211006375U - Bridge steel pipe strength nature skeleton concrete encircles construction structures - Google Patents

Abstract

The utility model discloses a bridge steel pipe stiffness framework concrete arch ring construction structure, which comprises an arch ring body of a steel pipe stiffness framework structure which is spliced in sections, wherein a steel pipe at the upper part of the arch ring body is an upper chord pipe, a steel pipe at the lower part of the arch ring body is a lower chord pipe, and the bottom of the arch ring body is a precast concrete bottom plate; the upper surface of the upper chord pipe is provided with an exhaust hole, and the upper surface of the lower chord pipe is provided with an exhaust pipe with the top end extending out of the surface of the precast concrete bottom plate. The utility model has the characteristics of the operation degree of difficulty is less, and the danger coefficient is lower, and the construction speed is very fast.

Description

Bridge steel pipe strength nature skeleton concrete encircles construction structures

Technical Field

The utility model relates to a bridge encircles circle construction structures, especially a bridge steel pipe strength nature skeleton concrete encircles circle construction structures.

Background

The steel pipe stiff skeleton concrete arch bridge is a reinforced concrete arch bridge formed by coating concrete on a steel pipe stiff skeleton erected into an arch to form an arch ring, and is a typical self-erecting system bridge.

Because the steel pipe stiff framework concrete arch ring is large in size and heavy in weight, and the hoisting capacity of a hoisting system is limited, the construction mode of the existing steel pipe stiff framework concrete arch ring is generally that a steel pipe stiff framework is firstly split into a plurality of sections, the sections are hoisted to installation positions and then are assembled, then a template is built, and filling of concrete in a steel pipe and pouring of a bottom plate, a web plate and a top plate are carried out.

Because the steel pipe strength nature skeleton is the skeleton of fretwork, in the template process of building, there is the operation degree of difficulty big, danger coefficient is high, construction speed is slow problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bridge steel pipe strength nature skeleton concrete encircles circle construction structures. The utility model has the characteristics of the operation degree of difficulty is less, and the danger coefficient is lower, and the construction speed is very fast.

The technical scheme of the utility model: a bridge steel pipe stiff framework concrete arch ring construction structure comprises an arch ring body of a steel pipe stiff framework structure which is spliced in sections, wherein steel pipes on the upper portion of the arch ring body are upper chord pipes, steel pipes on the lower portion of the arch ring body are lower chord pipes, and a precast concrete bottom plate is arranged at the bottom of the arch ring body; the upper surface of the upper chord pipe is provided with an exhaust hole, and the upper surface of the lower chord pipe is provided with an exhaust pipe with the top end extending out of the surface of the precast concrete bottom plate.

According to the concrete arch ring construction structure with the stiff skeleton of the bridge steel pipe, the cross section of the arch ring body is in the shape of a Chinese character ri, and the upper chord pipe and the lower chord pipe are respectively located on the nodes of the Chinese character ri.

In the concrete arch ring construction structure with the stiff skeleton of the bridge steel pipe, the arch ring body is connected with the bolts through the lining pipe and the flange plate.

In the concrete arch ring construction structure with the stiff skeleton of the bridge steel pipe, the exhaust pipe is a PVC pipe.

In the construction structure of the concrete arch ring with the steel pipe stiff skeleton of the bridge, the aperture of the exhaust hole and the exhaust pipe is 1 cm.

The beneficial effects of the utility model

The precast concrete bottom plate is arranged at the bottom of the arch ring body, and can be used as an operation platform in the later construction process to carry out construction of a web plate, a top plate and other processes, so that the construction safety is greatly improved, and the danger coefficient is reduced; meanwhile, the procedures of formwork erecting and pouring of the aerial bottom plate are reduced, the operation difficulty is reduced, and the construction speed is accelerated.

And simultaneously, the utility model discloses a set up exhaust hole and blast pipe on the steel pipe and can play the carminative effect in the steel pipe when filling.

Drawings

FIG. 1 is a schematic structural view of a stiff framework arch ring of the present invention;

FIG. 2 is a partial schematic view of a steel pipe at the lower part of a stiff skeleton;

FIG. 3 is a partial schematic view of a steel pipe at the upper part of a stiff skeleton;

fig. 4 is a cross-sectional view of fig. 1.

Description of reference numerals: 1-an arch ring body, 11-an upper chord tube, 12-a lower chord tube, 2-a filling tube, 3-an exhaust tube, 4-an exhaust hole and 5-a precast concrete bottom plate.

Detailed Description

The present invention will be further described with reference to the following examples, which are not intended as a limitation of the present invention.

Embodiments of the utility model

A bridge steel pipe stiff skeleton concrete arch ring construction structure is shown in attached figures 1-4 and comprises an arch ring body 1 of a steel pipe stiff skeleton structure which is spliced in sections, wherein steel pipes on the upper portion of the arch ring body 1 are upper chord pipes 11, steel pipes on the lower portion of the arch ring body are lower chord pipes 12, and the bottom of the arch ring body 1 is a precast concrete bottom plate 5; the upper surface of the upper chord pipe 11 is provided with an exhaust hole 4, and the upper surface of the lower chord pipe 12 is provided with an exhaust pipe 3 the top end of which extends out of the surface of the precast concrete bottom plate 5.

The section of the arch ring body 1 is in a shape of a Chinese character 'ri', and the upper chord tube 11 and the lower chord tube 12 are respectively positioned on the nodes of the Chinese character 'ri'.

The arch ring body 1 is connected with a bolt through a lining pipe and a flange plate.

The exhaust pipe 3 is a PVC pipe.

The aperture of the exhaust hole 4 and the exhaust pipe 3 is 1 cm.

The construction steps are as follows:

(1) designing the length of an arch ring body 1 according to the span of a bridge, wherein the cross section of the arch ring body 1 is in a shape of a Chinese character 'ri', an upper chord pipe 11 and a lower chord pipe 12 are positioned on a node and are split into a plurality of sections to be prefabricated, and when the prefabricated arch ring is prefabricated, an exhaust hole 4 (the aperture is 1 cm) is arranged on the upper surface of the upper chord pipe 11, and a PVC exhaust pipe 3 (the aperture is 1 cm) is arranged on the upper surface of the lower chord pipe 12;

(2) transporting the prefabricated arch ring body 1 to a construction site, prefabricating the precast concrete bottom plate 5 of each section of steel pipe stiff framework on the ground, wherein the precast concrete bottom plate 5 adopts concrete with the reference number of C55, and the top end of the exhaust pipe 3 extends out of the precast concrete bottom plate 5 during prefabrication;

(3) hoisting the steel pipe stiff skeleton of the prefabricated concrete bottom plate to a mounting position through a hoisting system for splicing, wherein the splicing is realized by matching a conventional lining pipe with a flange plate and a bolt;

(4) after the concrete is spliced into an arch (as shown in figure 1), self-compacting concrete with the reference number of C80 is poured into the upper chord tube 11 and the lower chord tube 12 through the pouring tube 2, the diameter of the pouring tube 2 is consistent with the inner diameters of the upper chord tube 11 and the lower chord tube 12, and through design, the pouring tube 2 is preferably arranged at the 1/2 position, the 3/8 position and the 1/4 position (as shown in figure 1) of an arch ring respectively, when in pouring, the concrete is poured from the top of the pouring tube 2, the inner spaces of the upper chord tube 11 and the lower chord tube 12 are fully filled with the concrete through high head, the void ratio is reduced, and then wet joint concrete pouring between prefabricated concrete bottom plates is carried out;

(5) and after the pouring of the wet joint concrete of the bottom plate is finished, the precast concrete bottom plate 5 is taken as an operation platform, and the concrete web and the concrete top plate are poured by using the concrete with the reference number of C55.

After the construction is finished, the extended perfusion tube 2 is cut off.

The practical application case of the structure is as follows: the method comprises the following steps of constructing the grand bridge of the fishing pond in the project from the G352 Zhengan county Greens to the big yard subroad expansion project, wherein the grand bridge of the fishing pond grand bridge adopts a net-200 upper bearing type reinforced concrete rigid framework box arch, two side column type bent frames are arranged on the arch, the web hole is 19.3m, 1-span 30m fabricated prestressed concrete T-beam guide holes are respectively arranged on two banks, and the main arch ring is designed by a steel pipe rigid framework.

The main arch ring is characterized in that the net rise span ratio of a main hole is 1/5, the main arch axis is a catenary, the arch axis coefficient is m =1.988, the arch axis range is equal in section, the height of the arch ring is 360cm, the width of the arch ring is 850cm, the sections of two chambers of a single box are respectively 35cm, the thicknesses of the top and bottom plates of the arch ring are respectively 35cm, the thicknesses of the side and middle webs are respectively 35cm, the bottom plate is prefabricated, the upper chamfer and the lower chamfer of the chamber are respectively 45 × 45cm, the transverse partition plate of the arch ring is provided with 1 web plate with the thickness of 40cm at the position corresponding to an upright post, the total transverse partition plate of the full bridge is 21, the arch ring is arched by adopting a rigid framework process, the mark of arch ring concrete is C55 high-performance concrete, C80 self-compacting concrete is poured in a pipe, the division of the main arch ring section is controlled according to the component transportation length and the hoisting weight, the main arch ring section.

The arch springing joint: the rigid framework is connected from the hoisting arch foot section to the arch top section, and the arch feet are hinged. The design realizes the hinge taking the end part of the lower chord as a rotating fulcrum by embedding the upper and lower chord steel sleeves with different depths in the arch center. The design is that in order to increase the rigidity of the end part of the lower chord, a back cover steel plate and a cross stiffening rib within the range of 50cm are additionally arranged. After the arch ring is closed, the chord pipe and the steel sleeve are welded at the stable time of the temperature environment, and the stiffening ribs are welded at the same time to form arch foot consolidation. The arch springing is fixed at the rear of the arch springing and can be disassembled.

The middle joint is bolted by adopting an inner lining pipe matched with an outer flange plate and 12M 3690 mm 10.9S-grade high-strength bolts, the joints are not subjected to any welding work except the bolting of the outer flange plate for convenience of construction, the web members at the joints are adjusted to be 2-limb L75 × mm angle steel at each of two sides of the joints by 4-limb L × mm angle steel, chord members are arranged at two sides of the joints in parallel connection and transverse connection, namely, the aerial welding work is avoided by the modes of double web members, double parallel connection and double transverse connection, the clear distance between the web members at the joints is 6cm, the free length of the chord members is very short, and the stress is not influenced.

The design theoretical value of the arch crown closure segment length is 20cm, but because of length errors caused by segment manufacture and temperature influence, the gap length of each steel pipe is required to be accurately measured in a period of 10-15 ℃ and stable air temperature, an embedding and filling pipe with the same diameter and wall thickness as the steel pipe is processed according to the size of the steel pipe, annular steel embedding and filling sheets (such as 1mm thickness, 2mm thickness and the like are suitable) with the same outer diameter as the chord pipe are prepared, gaps among the segments are tightly filled by the embedding and filling sheets, then two semicircular outer clamping plates with the thickness of 20mm are installed between the closure gaps (the positions of the clamping plates are positioned by overlapping the length center of the outer clamping plates with the closure gap center), and 24M 24 × 90mm 10.9S-level high-strength bolts are used for bolting, and the pipe orifices of the clamping plates and the pipe walls of the chord pipes are welded.

The main construction process of the whole bridge is as follows:

the first process is as follows: the site construction mainly comprises a mixing station of the project part, a T beam of a pilot hole of a super bridge of a fishpond and a belly

The method comprises the following steps of arranging a hole T beam, a steel pipe stiff skeleton segment, an arch ring steel pipe stiff skeleton segment bottom plate concrete pouring platform, arch ring bent frame columns, arch ring bent frame cover beams, a prefabricated site and prefabricated component stacking sites, wherein the arrangement comprises equipment type selection, power supply, water supply, channel arrangement and the design of various component lifting appliances;

and a second process: finishing abutment of No. 0 and No. 3 bridge platforms of the fishing pond grand bridge and finishing installation of a cable hoisting system cable tower;

and a third process: performing main cable post-anchor construction;

and (4) a fourth process: erecting a main cable and a working cable, and installing a hoisting and traction system;

and a fifth process: according to the excavation progress of the arch foundation, 1# and 2# arches of 25-ton cranes or cable hoisting systems

A seat and a juncture pier;

and a sixth process: prefabricated guide hole T beam, steel pipe stiff skeleton segment assembly and segment bottom plate concrete prefabrication

Pouring;

a seventh process: assembling a guide hole T beam to complete the pouring of the diaphragm plate and the wet joint;

and (eight) flow: hoisting No. 1-6 segments of the arch ring stiff framework, and tensioning the buckle cable and the back cable;

the process is nine: installing a buckle tower;

and (5) a flow ten: installing No. 7-9 sections of the rigid frameworks of the arch ring steel pipes, and tensioning the buckling cables and the back cables;

the first procedure is that self-compacting concrete is poured into the arch ring steel pipe, C80 high-strength high-performance concrete is adopted, the self-weight of the concrete is used for compacting, pouring steel pipes are arranged at the positions of the arch axes 1/2, 3L/8 and L/4, the height of each pouring pipe is 6m, and the steel pipes with the same size as the chord members are adopted and are perpendicular to the upper chord members for welding;

a twelfth process: carrying out concrete wet joint of the arch ring bottom plate, removing the buckling cables and the back cables, and removing the buckling tower;

a thirteen process: pouring concrete on the web plate, the top plate and the bent base, and removing the arch ring wave wind rope;

the process is fourteen: constructing an upper arch row frame and a cover beam;

a fifteenth procedure: and hoisting and erecting the web hole T beam to complete the pouring of the transverse clapboard and the wet joint of the T beam:

sixthly, the process is as follows: and (5) dismantling the temporary cable tower facilities, and carrying out bridge deck auxiliary facility construction.

The above, only do the utility model discloses create the embodiment of preferred, nevertheless the utility model discloses the protection scope of creation is not limited to this, and any technical personnel who is familiar with this technical field are in the utility model discloses create the technical scope of disclosure, according to the utility model discloses technical scheme and the utility model design that creates of the utility model are equivalent replacement or change, all should be covered within the protection scope of creation of the utility model.

Claims (5)

1. The utility model provides a bridge steel pipe strength nature skeleton concrete encircles construction structures which characterized in that: the steel pipe arch ring comprises an arch ring body (1) of a steel pipe stiff skeleton structure which is spliced in sections, wherein the steel pipe at the upper part of the arch ring body (1) is an upper chord pipe (11), the steel pipe at the lower part of the arch ring body is a lower chord pipe (12), and the bottom of the arch ring body (1) is a precast concrete bottom plate (5); the upper surface of the upper chord pipe (11) is provided with an exhaust hole (4), and the upper surface of the lower chord pipe (12) is provided with an exhaust pipe (3) the top end of which extends out of the surface of the precast concrete bottom plate (5).

2. The bridge steel pipe stiff skeleton concrete arch ring construction structure of claim 1, characterized in that: the section of the arch ring body (1) is in a shape of Chinese character ri, and the upper chord tube (11) and the lower chord tube (12) are respectively positioned on the nodes of the Chinese character ri.

3. The bridge steel pipe stiff skeleton concrete arch ring construction structure of claim 1, characterized in that: the arch ring body (1) is connected with a bolt through a lining pipe and a flange plate.

4. The bridge steel pipe stiff skeleton concrete arch ring construction structure of claim 1, characterized in that: the exhaust pipe (3) is a PVC pipe.

5. The bridge steel pipe stiff skeleton concrete arch ring construction structure of claim 1, characterized in that: the aperture of the exhaust hole (4) and the exhaust pipe (3) is 1 cm.

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