CN-116289488-B - Steel trestle capable of resisting flood season rapid flow and construction method thereof

CN116289488BCN 116289488 BCN116289488 BCN 116289488BCN-116289488-B

Abstract

The invention provides a steel trestle for resisting rapid flow in flood season, which comprises a steel trestle, a steel pipe and an anchoring device, wherein one end of the anchoring device is anchored on a steel support, and the other end of the anchoring device is anchored under water together with the lower section of the steel pipe and a sinking pipe hole through concrete. The upper section of the steel pipe can be recycled after construction is completed, the occupied time of turnover materials is short, the parallel connection of the trestle steel pipe piles can be used as a force transmission structure of an anchor beam, and the overall use cost of the flood fighting structure is low. The constraint connection of the anchoring device is reliable, the whole anchoring structure has the property of friction piles, the rock stratum is fully involved in the stress to provide effective constraint by utilizing the reaming structure, meanwhile, the self weight of the anchoring body also provides the constraint function of resisting the designed running water load, the construction method is less influenced by geology and topography, the problem of compression rod stability of the long steel pipe is avoided compared with the traditional flood fighting structure stress member, the adaptability is stronger, and the material utilization rate and turnover rate are improved.

Inventors

LI CHANG
GUO JINGSHENG
LI JIANMIN
MA YUNPENG
TAI HUASONG
ZHANG XIANGMING
SUN WENZHI
LI QIAN
GUO JINLONG
ZHU JIANHUA
ZHANG XUHUA
GUO HANSHU

Assignees

中铁九局集团第五工程有限公司
中铁九局集团有限公司

Dates

Publication Date: 20260508
Application Date: 20230210
Priority Date: 20221226

Claims (8)

1. A steel trestle of resistant flood season rapid current, its characterized in that includes: The steel trestle is provided with an anchor beam, and a steel support above a preset flood pressure acting surface is arranged on the anchor beam; the steel pipe comprises an upper steel pipe section and a lower steel pipe section which are spliced with each other in a detachable mode, wherein the upper end of the upper steel pipe section is used for transmitting the shock excitation force of the immersed pipe to the lower steel pipe section, the upper steel pipe section is lifted out after the immersed pipe is completed, the lower steel pipe section is left in an immersed pipe hole, is used as a steel pile casing of a weak stratum section during construction, and is used as an anchoring structure component part after the construction is completed; The anchoring device is anchored on the steel support at one end and anchored under water at the other end together with the lower section of the steel pipe and the immersed tube hole through concrete; The anchoring device comprises: The steel reinforcement cage is poured into the lower section of the steel pipe and the sinking pipe hole through concrete; one end of the anchor cable is connected to the reinforcement cage, and the other end of the anchor cable is connected to the steel support; an anchor connector close to the river bed surface is arranged between the anchor cable and the reinforcement cage and used for adjusting the angle of the free section of the anchor cable; The outer side of the lower edge of the lower section of the steel pipe is provided with at least two connecting plates extending upwards, the upper section of the steel pipe is provided with prefabricated hole grooves corresponding to the two sides of the connecting plates, fasteners are arranged in the prefabricated hole grooves, the two ends of each fastener are folded back, the two ends of each fold back extend to the outer side of the connecting plate and the inner side of the upper section of the steel pipe respectively, and a folding part at one end of each fastener is in threaded connection with a fastening bolt for propping up the outer side of the connecting plate; a gap is reserved between the upper section of the steel pipe and the lower section of the steel pipe in a hoisting state, a pushing plate is arranged in the middle of the outer side of the connecting plate, and the upper edge of the pushing plate is abutted against the fastening bolt; After sinking the pipe is completed by applying exciting force, the upper section of the steel pipe is tightly attached to the lower section of the steel pipe, and the fastener inclines and is separated from the connecting plate under the pushing of the pushing plate.
2. The steel trestle for resisting flood season rapid flow according to claim 1, wherein the lower section of the steel pipe and the immersed tube hole are provided with positioning steel reinforcement frameworks matched with the apertures of the steel pipe and the immersed tube hole, and the positioning steel reinforcement frameworks are fixedly connected with the steel reinforcement cages; And an isolation sleeve is sleeved at one end of the anchor cable corresponding to the reinforcement cage, and a hole between the end part of the isolation sleeve and the anchor cable is plugged by a rubber sleeve.
3. The steel trestle for resisting flood season rapid flow according to claim 1, wherein a plurality of groups of limiting plates are arranged on the upper edge of the lower section of the steel pipe, the limiting plates comprise inner limiting plates and outer limiting plates which are arranged on the inner side and the outer side of the upper section of the steel pipe, and gaps between the inner limiting plates and the outer limiting plates are matched with the wall thickness of the upper section of the steel pipe.
4. A construction method of a steel trestle for resisting flood season rapid flow, which is used for constructing the steel trestle according to any one of claims 1 to 3, and is characterized by comprising the following steps: S1, constructing a main structure of a steel trestle; s2, assembling the upper section and the lower section of the steel pipe, and carrying out steel pipe sinking operation by utilizing exciting force of a vibrating hammer after integral hoisting and sinking; Step S3, in the process of sinking the steel pipe, the upper section of the steel pipe and the lower section of the steel pipe are subjected to vibration by a vibration force to release connection locking, after the sinking pipe is in place, the upper section of the steel pipe is pulled out for recycling, and the lower section of the steel pipe is detained in a weak stratum to serve as a steel casing of the weak stratum section; And S4, lowering an anchoring device, wherein the lower end of the anchoring device is anchored in the lower section of the steel pipe and the immersed tube hole, and the other end of the anchoring device is stretched on an anchor beam of the steel trestle.
5. The steel trestle construction method for resisting flood season rapid flow according to claim 4, wherein in step S1, firstly, steel pipe pile construction of the steel trestle is performed; The method comprises the steps of installing longitudinal and transverse parallel joints between steel pipe piles of a steel trestle, and welding an anchor beam and a steel support based on the parallel joints, wherein the steel support is used for connecting an anchoring device and is positioned above a preset flood pressure acting surface; Backfilling sand filling in the steel pipe pile directly connected with the anchor beam through parallel connection, wherein the sand filling elevation is positioned above the steel support; and sequentially installing a bearing main beam, bei Leizhu longitudinal beams and a bridge deck system of the steel trestle, and completing the construction of the steel trestle.
6. The construction method of steel trestle for resisting flood season rapid flow according to claim 4, wherein in step S2, a guide frame is constructed by utilizing the existing structure of the steel trestle, and a sinking pipe hole is guided to be below the rock stratum surface through a hole guiding device; After the steel pipe is immersed in place, reaming the immersed tube hole by using reaming equipment, wherein the reaming angle is not less than 15 degrees; after the reaming process is completed and (5) performing hole cleaning operation.
7. The construction method of a steel trestle for resisting rapid flood season according to claim 5, wherein in step S4, the anchoring device comprises a steel reinforcement cage and an anchor cable, wherein the steel reinforcement cage is positioned in the lower section of the steel pipe and the immersed tube hole, one end of the anchor cable is connected to the steel reinforcement cage, and the other end is connected to the steel support; And pouring concrete into the lower section of the steel pipe and the sinking pipe hole to form an underwater anchoring structure system together with the anchor cable system, the lower section of the steel pipe, the reinforcement cage and the reinforcement cage.
8. The construction method of the steel trestle for resisting rapid flow in flood season according to claim 4, wherein the pre-tensioning value is set to 15% -30% of the minimum breaking force of the anchor cable after the concrete reaches the designated strength, and the included angle between the anchor cable and the reinforcement cage after the anchor cable is tensioned is not more than 10 degrees.

Description

Steel trestle capable of resisting flood season rapid flow and construction method thereof Technical Field The invention belongs to the technical field of steel trestle construction, and particularly relates to a steel trestle for resisting flood season rapid flow and a construction method thereof. Background The traditional steel trestle flood-fighting structure adopts vertical flood-fighting piles more, and is connected with the existing trestle through a combined steel section or steel pipe parallel structure, so that the flood-fighting performance of the steel trestle is improved. The traditional method has low material utilization rate under the working conditions of large water depth and high flow rate, has poor turnover rate and provides insufficient horizontal constraint. And the phenomenon that the steel trestle is destroyed after flood peak and the flood fighting pile is independent exists because the parallel connection strength of part of engineering is insufficient. The reason for the problems is mainly that under the emergency flow working condition in flood season, the controllable load running water pressure affecting the safety of the trestle structure is horizontal force, the action point of the controllable load running water pressure is positioned at the depth of 0.3 times of the water under the water line according to the related technical standard, and under the working condition of large water depth and high flow velocity, the bending moment at the theoretical embedding point of the steel pipe pile is larger due to the large horizontal load and the arm length of the acting force, and the steel pipe pile is easy to damage due to insufficient bending strength. Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art. Disclosure of Invention The application aims to overcome the defects in the prior art, and provides a steel trestle for resisting flood season rapid flow and a construction method thereof. In order to achieve the above object, the present invention provides the following technical solutions: A steel trestle for resisting flood season rapid flow, comprising: The steel trestle is provided with an anchor beam, and a steel support above a preset flood pressure acting surface is arranged on the anchor beam; the steel pipe comprises an upper steel pipe section and a lower steel pipe section which are spliced with each other in a detachable mode, wherein the upper end of the upper steel pipe section is used for transmitting the shock excitation force of the immersed pipe to the lower steel pipe section, the upper steel pipe section is lifted out after the immersed pipe is completed, the lower steel pipe section is left in an immersed pipe hole, is used as a steel pile casing of a weak stratum section during construction, and is used as an anchoring structure component part after the construction is completed; and one end of the anchoring device is anchored on the steel support, and the other end of the anchoring device is anchored under water together with the lower section of the steel pipe and the immersed tube hole through concrete. Preferably, the anchoring device comprises: The steel reinforcement cage is poured into the lower section of the steel pipe and the sinking pipe hole through concrete; one end of the anchor cable is connected to the reinforcement cage, and the other end of the anchor cable is connected to the steel support; An anchor connector close to the river bed surface is arranged between the anchor cable and the reinforcement cage and used for adjusting the angle of the free section of the anchor cable. Preferably, the lower section of the steel pipe and the immersed tube hole are provided with positioning steel reinforcement frameworks matched with the diameters of the steel pipe and the immersed tube hole, and the positioning steel reinforcement frameworks are fixedly connected with the steel reinforcement cages; And an isolation sleeve is sleeved at one end of the anchor cable corresponding to the reinforcement cage, and a hole between the end part of the isolation sleeve and the anchor cable is plugged by a rubber sleeve. Preferably, the upper edge of the lower section of the steel pipe is provided with a plurality of groups of limiting plates, each limiting plate comprises an inner limiting plate and an outer limiting plate which are arranged on the inner side and the outer side of the upper section of the steel pipe, and a gap between the inner limiting plate and the outer limiting plate is matched with the wall thickness of the upper section of the steel pipe. Preferably, the outer side of the lower edge of the lower section of the steel pipe is provided with at least two connecting plates extending upwards, the upper section of the steel pipe is provided with prefabricated hole grooves corresponding to the two sides of the connecting plates, fasteners are arranged in the prefabricated hole groove