CN212105894U - Bridge bearing structure passing through giant karst cave - Google Patents
Bridge bearing structure passing through giant karst cave Download PDFInfo
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- CN212105894U CN212105894U CN202020611053.8U CN202020611053U CN212105894U CN 212105894 U CN212105894 U CN 212105894U CN 202020611053 U CN202020611053 U CN 202020611053U CN 212105894 U CN212105894 U CN 212105894U
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Abstract
The utility model relates to a tunnel and underground works field, concretely relates to bridge bearing structure who passes through huge solution cavity. The bridge bearing structure comprises a bridge structure and a protection structure; the protection structure comprises a first support beam and a second support beam, and further comprises a open cut tunnel structure or a shed tunnel structure, wherein the first support beam spans the karst cave, two ends of the first support beam are arranged on the stable bases at two sides of the karst cave, the second support beam spans the karst cave, two ends of the second support beam are arranged on the stable bases at two sides of the karst cave, and two sides below the open cut tunnel structure or the shed tunnel structure are respectively fixed on the first support beam and the second support beam; the bridge structure is arranged in the open cut tunnel structure or the shed tunnel structure and spans the karst cave, and two ends of the bridge structure are arranged on the stable foundation at two sides of the karst cave. Compared with the traditional cave crossing method by a backfilling method, the cave crossing method by adopting the prestressed concrete has the advantages of convenient construction and reliable structure, and avoids the defect of large post-construction settlement caused by backfilling huge cave slag.
Description
Technical Field
The utility model relates to a tunnel and underground works, especially a bridge bearing structure that passes through huge solution cavity.
Background
In the twenty-first century, along with the high-speed development of railway construction in China, high-standard double-track railways with the speed of 200km per hour are increasingly constructed, and particularly in mountainous areas in the middle and western parts, route selection is limited by various factors such as large curve radius, complex terrain and geological conditions and the like, the scale of a tunnel is rapidly increased, and the situation that the tunnel passes through karst is increasingly increased. When a large karst cave is spanned on a tunnel, the foundation collapse and the structural damage are possibly caused because the substrate is not densely backfilled or suspended, and therefore, an effective bearing structure is required to be adopted, and the safety of the tunnel during construction and operation can be ensured.
At present, when a karst cave is spanned on a tunnel, a treatment measure of abandoned slag backfilling is generally adopted, but aiming at the huge karst cave, the depth of the cave is as high as dozens of meters or even hundreds of meters, if backfilling is adopted, great post-construction settlement is inevitably generated, the defects of uneven stress, cracking damage and the like of the tunnel structure are caused, and the operation safety of tunnel engineering is seriously influenced. Therefore, the research on the novel tunnel bearing structure which has stable and reliable structure, small deformation and can span the huge karst cave has important engineering significance and practical value for solving the problems of cracking, damage, large settlement and the like of the tunnel structure under the extremely unfavorable condition.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the problems in the prior art, a bridge bearing structure passing through a huge karst cave is provided.
In order to realize the purpose, the utility model discloses a technical scheme be:
a bridge bearing structure passing through a huge karst cave comprises a bridge structure and a protective structure; the protection structure comprises a first support beam and a second support beam, and further comprises a open cut tunnel structure or a shed tunnel structure, wherein the first support beam spans across the karst cave, two ends of the first support beam are arranged on the stable bases at two sides of the karst cave, the second support beam spans across the karst cave, two ends of the second support beam are arranged on the stable bases at two sides of the karst cave, and two sides below the open cut tunnel structure are respectively fixed on the first support beam and the second support beam; the bridge structure is arranged in the open cut tunnel structure or the shed tunnel structure and spans the karst cave, and two ends of the bridge structure are arranged on the stable foundation of two sides of the karst cave.
The utility model provides a bridge bearing structure, for strideing across disconnect-type bearing structure, promptly: the first support beam, the second support beam and the bridge structure penetrate through the karst cave in a crossing mode, dynamic load generated by train operation is borne by the bridge structure, and static load of surrounding rocks is borne by the first support beam and the second support beam, so that separation of dynamic load and static load of the structure is achieved. Compared with the traditional cave crossing method by a backfilling method, the cave crossing method by adopting the bridge structure has the advantages of convenient construction and reliable structure, and avoids the defect of large post-construction settlement caused by backfilling huge cave slag. The structure form of dynamic and static separation is adopted, the stress of each part of the structure is clear, and the reliability is high. If a dynamic and static separation mode is not adopted, the open cut tunnel structure is directly arranged on the bridge structure, so that the load of the bridge structure is greatly increased, and the design difficulty is increased; on the other hand, the train generates fatigue damage to the open cut tunnel structure under the action of repeated periodic dynamic load, so that the structure is cracked, and once the structure is cracked, concrete falling blocks can be formed to influence the operation safety of the train.
As an optional scheme of the utility model, the bridge structures is prestressing force continuous beam structure, and its cross section is box or T type.
As an optional solution of the present invention, the first supporting beam and the second supporting beam are fish-bellied beams. The first supporting beam and the second supporting beam are arranged to be fish-belly beams, and the fish-belly beams have the advantages of being high in bending rigidity and saving materials.
As an optional scheme of the utility model, the protection structure further comprises a first supporting beam support and a second supporting beam support which are arranged on the stable foundation at two sides of the karst cave, wherein the first supporting beam support is used for supporting the first supporting beam, and the second supporting beam support is used for supporting the second supporting beam; the karst cave is characterized in that a first supporting beam support and a second supporting beam support are arranged on the stable foundation on one side of the karst cave, and a first supporting beam support and a second supporting beam support are also arranged on the stable foundation on the other side of the karst cave.
As an optional scheme of the utility model, the bridge structure further comprises a support and a bearing platform which are arranged on the stable foundation at two sides of the karst cave, two ends of the bridge structure are arranged on the bearing platform, and the bridge structure is arranged on the support; the bearing platform is in contact with the tunnels at the two ends of the bridge bearing structure.
As an optional scheme of the present invention, the protection structure includes a first layer protection structure and a second layer protection structure, the first layer protection structure includes the first support beam and the second support beam, and the first layer protection structure further includes the open cut tunnel structure or the shed tunnel structure; and the second layer of protection structure comprises a karst cave top anchor net spraying structure and a vertical long anchor rope, and the anchor net spraying structure and the vertical long anchor rope are used for anchoring surrounding rock on the upper part of the karst cave. Spout structure and vertical long anchor rope through the anchor net and realize outer protection, realize the inlayer protection through the open cut tunnel structure, adopt inside and outside double-deck protective structure, can defend the potential safety hazard and the accident that the piece produced fall in solution cavity top, ensure safety during the circuit operation.
As an optional scheme of the utility model, the open cut tunnel structure is the reinforced concrete structure, the shed tunnel structure is reinforced concrete component or steel structural component.
A construction method of a bridge bearing structure passing through a huge karst cave comprises the following steps:
s1, excavating stable foundations at two ends of a karst cave;
s2, constructing a first supporting beam support and a second supporting beam support;
s3, constructing a support and a bearing platform;
s4, constructing a first supporting beam and a second supporting beam;
s5, constructing a bridge structure;
s6, constructing an anchor net spraying structure at the top of the karst cave and a vertical long anchor rope;
and S7, constructing a open cut tunnel structure or a shed tunnel structure.
As an optional solution of the present invention, in the step S3, the step S4 and/or the step S5, a hanging basket construction is adopted.
As an alternative scheme of the utility model in step S6, treat that bridge construction and a supporting beam reach design strength after to bridge construction and a supporting beam conduct work platform, carry out the construction that the anchor net spouts structure and long anchor rope. The utility model provides an above-mentioned construction method to bridge structures and a supporting beam are as work platform, construction convenience, efficient.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. compared with the traditional cave crossing method by a backfilling method, the cave crossing method by adopting the prestressed concrete continuous box girder bridge structure has the advantages of convenient construction and reliable structure, and avoids the defect of large post-construction settlement caused by backfilling huge cave slag.
2. By adopting the structure form of dynamic and static separation, the internal bridge structure bears the dynamic load of the ballast bed and the train, the fish-belly beams on the left side and the right side bear the lining load of the open cut tunnel, the dynamic and static loads are transmitted and dispersed, the stress of each structure is clear, and the reliability is high.
3. Adopt inside and outside double-deck protective structure, outer anchor net spouts structure and vertical long anchor rope and seals, consolidate solution cavity top country rock, has avoided the solution cavity top large-scale piece that falls, and the inlayer adopts open cut tunnel structure or shed tunnel structure to carry out the shade to inside bridge structures, can defend the local fritter footpath in solution cavity top and fall the piece, and safety, reliability are high during the circuit operation.
4. The fish-bellied beam design of circuit both sides, abundant consideration simply supported beam structure moment of flexure distribution rule, stride the characteristics that the limit is little to the well big span, alleviateed the dead weight of structure on the one hand and reduced the engineering investment, on the other hand has also ensured the reliability of structure.
5. Aiming at the giant cave engineering which develops by crossing the underground river, the scheme can avoid the construction period delay and the investment increase caused by line change or the change of the existing water system, and save the cost of large-scale cave slag backfilling and base treatment. Has good economic benefit and social benefit.
Drawings
Fig. 1 is a schematic structural view of a bridge bearing structure passing through a huge karst cave provided by the embodiment of the present invention along the longitudinal direction of a bridge.
Fig. 2 is a partially enlarged view of a portion C in fig. 1.
Fig. 3 is a schematic view along the section a-a in fig. 1.
Fig. 4 is a schematic view along section B-B in fig. 1.
Fig. 5 is a schematic structural diagram of a first support beam according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of the construction method according to the embodiment of the present invention when step S4 is performed.
Fig. 7 is a schematic diagram of the completion of step S4 in the construction method according to the embodiment of the present invention.
Fig. 8 is a schematic diagram of the completion of step S5 in the construction method according to the embodiment of the present invention.
Fig. 9 is a schematic diagram of the completion of step S6 in the construction method according to the embodiment of the present invention.
Icon: 1-bridge structure; 2-a support; 3-a cushion cap; 4-anchor net spraying structure; 5-vertical long anchor cable; 6-open cut tunnel structure; 701-a first support beam; 702-a second support beam; 801-support beam support I; 802-support beam support two; 9-a stable base; 10-karst cave.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
Please refer to fig. 1-9. The embodiment of the utility model provides a cross bridge bearing structure of huge karst cave 10, it includes bridge construction 1 and protective structure.
Please refer to fig. 3 and 4. The protective structure comprises a first layer of protective structure and a second layer of protective structure, wherein the first layer of protective structure comprises a cut-and-tunnel structure 6, a first support beam 701, a second support beam 702, a first support beam support 801 and a second support beam support 802. The second layer of protective structure includes that anchor net spouts structure 4 and vertical long anchor rope 5 to strut.
Specifically, the anchor net spraying structure 4 and the vertical long anchor cable 5 support and are used for fixing surrounding rocks at the top of the karst cave 10. Through setting up vertical long anchor rope 5, ensure that the bold rock mass at solution cavity 10 top can be anchored, vertical long anchor rope 5 spouts structure 4 with the anchor net and combines together, can improve the security of structure.
The first support beam 701 and the second support beam 702 are respectively arranged on two sides of the line direction, the first support beam 701 and the second support beam 702 both span the karst cave 10, and two ends of the first support beam 701 and the second support beam 702 are respectively arranged on the stable foundation 9 on two sides of the karst cave 10.
Furthermore, two ends of the first support beam 701 are respectively fixed on the stable foundation 9 at two sides of the cave 10 through a first support beam support 801. Two ends of the second support beam 702 are respectively fixed on the stable foundation 9 at two sides of the cave 10 through a second support beam support 802. The first support beam 701 and the second support beam 702 are both fish-bellied beams. Please refer to fig. 5.
The open cut tunnel structure 6 is arch-shaped, and the lower part of one side of the open cut tunnel structure is fixed on the first support beam 701, and the lower part of the other side of the open cut tunnel structure is fixed on the second support beam 702. In the present embodiment, the open cut tunnel is a reinforced concrete structural member.
Referring to fig. 1 and 2, the bridge bearing structure further includes a support 2 and a bearing platform 3. A support 2 and a bearing platform 3 are respectively arranged on the stabilizing bases 9 at two sides of the cave 10. The bridge structure 1 is arranged in the open cut tunnel structure 6 and spans across the karst cave 10, two ends of the bridge structure 1 are respectively positioned on bearing platforms 3 on the stable foundations 9 on two sides, and the bridge structure 1 is arranged on a support 2 on the stable foundations 9 on two sides.
The two bearing platforms 3 are respectively contacted with the tunnels at the two ends of the bridge bearing structure.
Specifically, in the present embodiment, the bridge structure 1 is a prestressed concrete continuous box girder.
The embodiment of the utility model provides a still provide a construction method to above-mentioned bridge bearing structure who passes through huge karst cave 10, it includes following step:
s1, excavating stable foundations 9 at two ends of a karst cave 10;
s2, constructing a first supporting beam support 801 and a second supporting beam support 802;
s3, constructing a support 2 and a bearing platform 3;
s4, constructing a first supporting beam 701 and a second supporting beam 702;
referring to fig. 6 and 7, in step S4, a first support beam 701 and a second support beam 702 are constructed by a basket construction method;
s5, constructing a bridge structure 1;
referring to fig. 8, in step S5, a hanging basket construction method is used to construct the bridge structure 1;
s6, constructing an anchor net spraying structure 4 and supporting a vertical long anchor cable 5;
referring to fig. 9, in step S6, after the bridge structure 1, the first support beam 701, and the second support beam 702 reach the designed strength, the bridge structure 1, the first support beam 701, and the second support beam 702 are used as a construction platform to protect the anchor net-spraying structure 4 and the long vertical anchor cables 5.
And S7, constructing a open cut tunnel structure 6.
The structure after step S7 is completed is shown in fig. 3 and 4.
Compared with the traditional method of crossing the karst cave 10 by backfilling, the bridge bearing structure crossing the huge karst cave 10 hall has the advantages that the prestressed concrete continuous box girder is adopted to cross the karst cave 10, the construction is convenient, the structure is reliable, and the defect of large post-construction settlement caused by backfilling of 10 cave slag of the huge karst cave is avoided;
the structure form of dynamic and static separation is adopted, the stress of each part of the structure is clear, and the reliability is high;
an anchor net spraying structure 4 and a vertical long anchor cable 5 are used for supporting as an outer layer structure, and a open cut tunnel structure 6 is used as an inner layer protection structure, so that potential safety hazards and accidents caused by block dropping at the top of the karst cave 10 can be prevented, and the safety of a line during operation is ensured;
aiming at the giant karst cave 10 engineering developing through the underground river, the scheme can avoid the construction period delay and the investment increase caused by line change or the change of the existing water system, save the cost of large-scale cave slag backfilling and base treatment, and has good economic benefit and social benefit.
Example 2
The embodiment of the utility model provides a bridge bearing structure who passes through huge solution cavity 10, the difference with embodiment 1 lies in, in this embodiment, adopts the open cut tunnel structure 6 in embodiment 1 to replace the shed tunnel structure.
In this embodiment, the shed tunnel structure is a reinforced concrete member or a steel structural member.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A bridge bearing structure passing through a huge karst cave is characterized by comprising a bridge structure and a protective structure;
the protection structure comprises a first supporting beam and a second supporting beam, the protection structure further comprises a open cut tunnel structure or a shed tunnel structure, the first supporting beam spans across the karst cave, two ends of the first supporting beam are arranged on the stable bases at two sides of the karst cave, the second supporting beam spans across the karst cave, two ends of the second supporting beam are arranged on the stable bases at two sides of the karst cave, and two sides below the open cut tunnel structure or the shed tunnel structure are respectively fixed on the first supporting beam and the second supporting beam;
the bridge structure is arranged in the open cut tunnel structure or the shed tunnel structure and spans the karst cave, and two ends of the bridge structure are arranged on the stable foundation of two sides of the karst cave.
2. The bridge bearing structure for crossing a giant cavern of claim 1, wherein the bridge structure is a prestressed continuous beam structure having a box-shaped or T-shaped cross section.
3. The bridge bearing structure for crossing a giant cavern of claim 1, wherein the first support beam and the second support beam are fish-bellied beams.
4. The bridge bearing structure for crossing a giant cavern of claim 1, wherein the protection structure further comprises a first support beam support and a second support beam support on a stable foundation arranged at two sides of the cavern, the first support beam support is used for supporting the first support beam, and the second support beam support is used for supporting the second support beam;
the karst cave is characterized in that a first supporting beam support and a second supporting beam support are arranged on the stable foundation on one side of the karst cave, and a first supporting beam support and a second supporting beam support are also arranged on the stable foundation on the other side of the karst cave.
5. The bridge bearing structure for passing through the giant cavern of claim 1, wherein the bridge structure further comprises a support and a bearing platform arranged on a stable foundation at two sides of the cavern, two ends of the bridge structure are arranged on the bearing platform, and the bridge structure is arranged on the support;
the bearing platform is in contact with the tunnels at the two ends of the bridge bearing structure.
6. The bridge bearing structure for crossing a giant cavern of claim 1, wherein the protective structure comprises a first layer of protective structure and a second layer of protective structure, the first layer of protective structure comprises the first support beam and the second support beam, and the first layer of protective structure further comprises the open-cut tunnel structure or the shed-cave structure;
and the second layer of protection structure comprises a karst cave top anchor net spraying structure and a vertical long anchor rope, and the anchor net spraying structure and the vertical long anchor rope are used for anchoring surrounding rock on the upper part of the karst cave.
7. The bridge bearing structure for passing through the giant karst cave of claim 1, wherein the open cut tunnel structure is a reinforced concrete structural member;
the shed tunnel structure is a reinforced concrete member or a steel structure member.
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| CN202020611053.8U CN212105894U (en) | 2020-04-21 | 2020-04-21 | Bridge bearing structure passing through giant karst cave |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111411985A (en) * | 2020-04-21 | 2020-07-14 | 中铁二院工程集团有限责任公司 | Bridge bearing structure penetrating through giant karst cave and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111411985A (en) * | 2020-04-21 | 2020-07-14 | 中铁二院工程集团有限责任公司 | Bridge bearing structure penetrating through giant karst cave and construction method |
| CN111411985B (en) * | 2020-04-21 | 2024-06-11 | 中铁二院工程集团有限责任公司 | Bridge bearing structure penetrating through huge karst cave and construction method |
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