CN212611890U

CN212611890U - Steel-concrete combined arch bridge crossing karst cave in tunnel

Info

Publication number: CN212611890U
Application number: CN202021650522.3U
Authority: CN
Inventors: 李玲玉; 黄灿; 陈松洲
Original assignee: Road and Bridge International Co Ltd; China Communication South Road and Bridge Co Ltd
Current assignee: Road and Bridge International Co Ltd; China Communication South Road and Bridge Co Ltd
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-02-26
Anticipated expiration: 2030-08-10

Abstract

The utility model provides a cross steel-concrete combination arched bridge of solution cavity in tunnel, including many shaped steel arch ribs that set up side by side, the both ends of every shaped steel arch rib and pour the hunch seat fixed connection on the wall of solution cavity both sides, have a determining deviation between adjacent shaped steel arch rib to connect through many crossbeams, the crossbeam upper berth is equipped with supporting steel plate, and a layer of concrete arch rib has been pour at steel sheet support and shaped steel arch rib top, and concrete filling layer has been pour at concrete arch rib top, and concrete filling layer top surface flushes with the tunnel bottom surface. During construction, firstly, the section steel arch rib is installed through vertical rotation construction, then the section steel arch rib is used as a concrete arch rib at the upper part of the support construction, the characteristics of small self weight, high strength and convenience and quickness in installation of the section steel arch rib are fully utilized, and a template support is prevented from being erected under a bridge, so that the construction difficulty is reduced, the construction quality is guaranteed, the safety risk is reduced, and the construction cost is reduced.

Description

Steel-concrete combined arch bridge crossing karst cave in tunnel

Technical Field

The utility model belongs to the technical field of tunnel construction, a steel-concrete combined arch bridge structure that adopts for strideing across the solution cavity is related to when meetting the solution cavity in the tunnel excavation process.

Background

When meeting the solution cavity in the tunnel excavation construction process, for the less solution cavity, generally adopt the backfill mode to handle, for bigger solution cavity, can adopt the bridge to stride across. However, for large and deep karst caves, large machinery is difficult to play a role due to the narrow field in the tunnel, and the construction efficiency of the bridge in the cave is low; particularly, for the overflow karst cave, the problems of difficult erection of template supports under the bridge and the like exist, and the difficulty of constructing the bridge in the karst cave is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at crossing over the big problem of the large-scale solution cavity degree of difficulty in the tunnel work progress, provide a steel-concrete combined arch bridge structure of crossing over the solution cavity in the tunnel, reduce the construction degree of difficulty, improve the efficiency of construction.

The utility model provides a pair of stride across reinforced concrete combination arched bridge of solution cavity in tunnel, its characterized in that: including many shaped steel arch ribs that set up side by side, the both ends of every shaped steel arch rib with pour the hunch seat fixed connection on the wall of solution cavity both sides, have a determining deviation between adjacent shaped steel arch rib to connect through many crossbeams, the crossbeam upper berth is equipped with supporting steel plate, and steel sheet support and shaped steel arch rib top have been pour one deck concrete arch rib, and concrete filling layer has been pour at concrete arch rib top, and concrete filling layer top surface flushes with the tunnel bottom surface.

The utility model discloses according to karst cave department topographic condition and bridge span structural feature, adopt shaped steel to stride across the karst cave as the arch rib, at first accomplish the installation of shaped steel arch rib through erecting the grouping of commentaries on classics construction process during the construction, the difficulty that large-scale mechanical equipment is difficult to the exhibition of execution in having solved the tunnel, then utilize the shaped steel arch rib as support construction upper portion concrete arch rib, shaped steel arch rib and concrete arch rib form the steel and concrete combination arch structure and undertake upper portion load jointly after the construction is accomplished, make full use of shaped steel arch rib dead weight is little, high strength, characteristics such as simple to operate is swift, avoid setting up the template support under the bridge, thereby reduce the construction degree of difficulty, construction quality has been ensured, safety risk is reduced, construction cost.

Drawings

FIG. 1 is a schematic side view of the steel-concrete composite arch of the present invention;

FIG. 2 is a schematic structural view of the steel-concrete composite arch in elevation;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic plan view of a steel section rib;

FIG. 5 is a schematic view of the state of hoisting a section steel arch rib by using a truck crane;

FIG. 6 is a schematic view showing the vertical rotation of the steel arch rib;

FIG. 7 is a schematic view of the installation of the section steel ribs across the karst cave.

Detailed Description

As shown in fig. 1, fig. 2, fig. 3, fig. 4, the utility model provides a stride across reinforced concrete combination arched bridge of solution cavity in tunnel, including many shaped steel arch ribs 1 that set up side by side, every shaped steel arch rib 1's both ends and pour 3 fixed connection of hunch seat on the wall of 2 both sides in solution cavity, have a determining deviation between adjacent shaped steel arch rib to connect through many crossbeams 4, crossbeam 4 upper berth is equipped with supporting steel plate 5, and one deck concrete arch rib 6 has been pour at supporting steel plate 5 and shaped steel arch rib top, and concrete filling layer 7 has been pour at concrete arch rib 6 top, and concrete filling layer 7 top surface flushes with 8 bottom surfaces in tunnel.

The utility model discloses during the concrete implementation, shaped steel arch rib 1 can adopt the I-steel system of bending to form, and the web both sides of I-steel have two connecting plates 9 at every certain interval symmetrical welding, and the both ends of every crossbeam 4 pass through bolted connection with two connecting plates 9 just right on the double-phase adjacent arch rib respectively.

The concrete-reinforced composite arch bridge spanning the karst cave in the tunnel has the following specific construction method:

(1) as shown in fig. 5, two opposite arch bases 3 are poured on two side walls of the karst cave 2, wherein a hinged support 31 is preset on one arch base, and a section steel arch rib embedded section 32 is arranged on the other arch base;

(2) bending a plurality of I-shaped steels into an arc-shaped arch rib 1, wherein the span of the arch rib is arranged according to the distance between two arch seats; connecting 2-3 arch ribs into a group by adopting a cross beam;

(3) hoisting a group of arch ribs above an arch base 3 provided with a hinged support by using a truck crane 10, and connecting one end of each arch rib 1 with the arch base 3 through a rotary hinge;

(4) as shown in fig. 6, a fixed pulley 11 is arranged at a certain height of the side wall of the karst cave above an arch seat hinged with the arch rib, and a buckle cable 12 is connected with the other end of the arch rib 1 after passing around the fixed pulley;

(5) slowly releasing the buckle cable 12 to enable the arch rib to rotate towards the arch base on the other side of the karst cave under the action of gravity;

(6) as shown in fig. 7, after the arch rib is vertically rotated to the right position, the arch rib and the hinged support of the arch base are fixedly sealed, and the other end of the arch rib 1 is welded with an arch rib embedded section 32 on the other arch base 3;

(7) sequentially mounting and fixing the groups of arch ribs on the arch seats according to the method, connecting the groups of arch ribs into a whole by using the cross beam, and welding a support steel plate on the upper part of the cross beam;

(8) the profile steel arch rib and the supporting steel plate welded on the cross beam are used as template supports, and a layer of concrete arch rib is poured on the profile steel arch rib;

(9) and after the concrete arch rib reaches the design strength, pouring a concrete filling layer at the top of the concrete arch rib until the concrete filling layer is flush with the bottom surface of the tunnel, and then performing upper tunnel structure construction.

Claims

1. The utility model provides a reinforced concrete combination arch bridge of karst cave is striden in tunnel which characterized in that: including many shaped steel arch ribs that set up side by side, the both ends of every shaped steel arch rib with pour the hunch seat fixed connection on the wall of solution cavity both sides, have a determining deviation between adjacent shaped steel arch rib to connect through many crossbeams, the crossbeam upper berth is equipped with supporting steel plate, and steel sheet support and shaped steel arch rib top have been pour one deck concrete arch rib, and concrete filling layer has been pour at concrete arch rib top, and concrete filling layer top surface flushes with the tunnel bottom surface.

2. The reinforced concrete composite arch bridge spanning a karst cave in a tunnel according to claim 1, wherein: the structural steel arch rib is formed by bending I-shaped steel, two connecting plates are symmetrically welded on two sides of a web plate of the I-shaped steel at intervals, and two ends of each cross beam are respectively connected with the two connecting plates which are opposite to the two adjacent arch ribs through bolts.