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CN-121976478-A - High pier large cantilever special-shaped structure under difficult canyon landform condition and construction method

CN121976478ACN 121976478 ACN121976478 ACN 121976478ACN-121976478-A

Abstract

The application discloses a high pier large cantilever special-shaped structure and a construction method under the condition of difficult canyon landform, wherein the high pier large cantilever special-shaped structure comprises a rigid framework, the rigid framework is connected with the pier body, an externally-hung template is connected to the rigid framework, a pouring area is formed in the externally-hung template, and the rigid framework is located in the pouring area. The rigid framework is manufactured by adopting factory segments, the processing precision is high, the installation speed is high, meanwhile, the rigid framework is combined with the externally-hung template, the high-altitude professional working procedures are reduced, the high-altitude operation risk is reduced, a plurality of working faces can be operated simultaneously, the construction progress is accelerated, in addition, the rigid framework is utilized to replace the traditional stressed steel bars, the high-altitude steel bar binding is optimized to be assembled on land, the construction quality is ensured, the investment of a large temporary structure is reduced, and the construction cost is saved through the arrangement of the rigid framework.

Inventors

  • WANG JIE
  • ZHOU WEN
  • ZHENG ZHEN
  • TAN LIZHONG
  • Peng Zhenjin

Assignees

  • 中铁广州工程局集团有限公司

Dates

Publication Date
20260505
Application Date
20260202

Claims (10)

  1. 1. The utility model provides a high mound big cantilever dysmorphism structure under difficult danger canyon landform condition, its characterized in that includes rigid skeleton (2), rigid skeleton (2) are connected with pier shaft (1), be connected with on rigid skeleton (2) and hang template (3), be formed with in hanging template (3) and pour regional (36), rigid skeleton (2) are located and pour regional (36).
  2. 2. The high pier large cantilever special-shaped structure under the difficult canyon landform condition of claim 1 is characterized in that a steel skeleton (11) is pre-buried on the side wall of the pier body (1), the rigid skeleton (2) is welded with the steel skeleton (11), connecting steel bars are arranged on the steel skeleton (11), and the rigid skeleton (2) is connected with the connecting steel bar planting bars.
  3. 3. The high pier large cantilever special-shaped structure under the difficult canyon landform condition according to claim 2, wherein the externally hung template (3) comprises a bottom die (31), side dies (32) and side dies, the bottom die (31) is connected with the rigid framework (2) through externally hung pull rods (33), the side dies (32) are provided with two groups, the two groups of the side dies (32) are oppositely arranged on two sides of the rigid framework (2), the two groups of the side dies (32) are connected through opposite-pull screws (35), the side dies are arranged at one end, far away from the pier body (1), of the rigid framework (2), and the side dies are connected with the rigid framework (2) through connecting screws.
  4. 4. The high pier large cantilever special-shaped structure under the difficult canyon landform condition according to claim 3, wherein the rigid framework (2) is connected with a diagonal buckling rope (5), the pier body (1) is connected with a steel buckling tower (6), and one end of the diagonal buckling rope (5) far away from the rigid framework is connected with the steel buckling tower (6).
  5. 5. The special-shaped structure of the high pier large cantilever under the difficult canyon landform condition of claim 4, wherein the rigid framework (2) is connected with a diagonal lug plate (51), and the diagonal lug plate (51) extends out of the pouring area (36) and is connected with a diagonal buckling rope (5).
  6. 6. The special-shaped structure of the high pier large cantilever under the difficult canyon landform condition of claim 5, wherein the rigid framework (2) is also connected with a prestressed cable, and one end of the prestressed cable, which is far away from the rigid framework (2), is connected with a steel buckling tower (6).
  7. 7. The high pier large cantilever special-shaped structure under the difficult canyon landform condition according to claim 6, wherein a construction platform (4) is further connected below the rigid framework (2), two groups of railings (41) are arranged on the construction platform (4), and a construction channel (42) is arranged between the railings (41) and the side mould (32).
  8. 8. The construction method based on the high pier large cantilever special-shaped structure under the difficult canyon landform condition of claim 7 is characterized by comprising the following steps: S1, constructing a high pier body (1) by utilizing tower crane cooperation; s2, installing a rigid framework (2) on the pier top, and constructing a pier cap (12); S3, integrally installing a steel buckling tower (6) on the pier top by using a tower crane, and hoisting a rigid framework (2), an externally-hung template (3) and a construction platform (4) by using the tower crane; S4, installing a diagonal buckle cable (5), and adjusting the elevation of the rigid framework (2) by using the diagonal buckle cable (5); S5, repeating the steps S3 and S4 until all the rigid frameworks (2), the externally hung templates (3) and the construction platform (4) are hoisted; S6, installing a prestressed cable, and integrally piling up to form a construction large cantilever concrete beam structure; And S7, after the construction of the large cantilever concrete beam structure and the tensioning prestress are completed, removing the external formwork (3), the construction platform (4) and the cable-stayed buckling cables (5) to complete the special-shaped high pier construction.
  9. 9. A construction method according to claim 8, wherein in step S3, the rigid frame (2) is lifted first, then the bottom mold (31) and the construction platform (4) are lifted, and then the side mold (32) and the side mold are lifted.
  10. 10. The construction method according to claim 8, wherein in the step S3, the rigid framework (2), the external formwork (3) and the construction platform (4) are assembled into a whole, and then the whole rigid framework (2), the external formwork (3) and the construction platform (4) are hoisted by using a tower crane.

Description

High pier large cantilever special-shaped structure under difficult canyon landform condition and construction method Technical Field The application relates to the technical field of high pier large cantilever special-shaped structures, in particular to a high pier large cantilever special-shaped structure under the condition of difficult canyon landform and a construction method. Background Under the condition of difficult canyon landform, the construction of the oversized cantilever special-shaped beam generally adopts the following construction methods: 1. the floor support method is characterized in that a high support is erected to construct a large cantilever special beam through a hardened ground construction site, the foundation is difficult to treat in difficult canyon landform environment, the site is not provided with conditions, the floor support is up to more than 60 meters, the wind-gusting effect in the canyon area is obvious, the support risk is large-! 2. The large cantilever bracket is designed by adopting the high pier embedded bracket to construct the large cantilever special-shaped beam, the large cantilever bracket is oversized, the high altitude installation is difficult, the integral instability risk exists, and the construction of the end part width-changing section of the large cantilever special-shaped beam cannot be solved. 3. The large cantilever special-shaped beam is constructed by adopting the hanging basket segments, namely the hanging basket is large in one-time investment, the construction is needed by adopting a segment method, the prestress design is complex, the construction period is long, the end part width-changing segment structure of the large cantilever special-shaped beam is complex (the width of the cantilever in general hanging basket construction is basically the same, so that the hanging basket can always move, but after the width of the large cantilever structure 7 is changed, the general hanging basket is not suitable, and the structural design of the hanging basket is difficult, as shown in figure 1). Because the traditional mode is difficult to construct the special-shaped beam of the oversized cantilever, a brand new construction mode is needed. Disclosure of Invention The application aims to provide a high pier large cantilever special-shaped structure under the condition of difficult canyon landform and a construction method thereof, so as to solve the problem of difficult construction of an oversized cantilever special-shaped beam under the condition of difficult canyon landform. In a first aspect, the application provides a high pier large cantilever special-shaped structure under difficult canyon landform conditions, which adopts the following technical scheme: The utility model provides a big cantilever dysmorphism structure of high mound under difficult dangerous canyon landform condition, includes the rigidity skeleton, the rigidity skeleton is connected with the pier shaft, be connected with the external template on the rigidity skeleton, be formed with in the external template and pour the region, the rigidity skeleton is located and pours the region. Through adopting above-mentioned technical scheme, the rigid skeleton adopts mill's section to make, machining precision is high, installation rate is fast, and rigid skeleton combines the external formwork simultaneously, has reduced high altitude professional process, has reduced high altitude construction risk, can a plurality of working faces simultaneous operation for construction progress, in addition, utilizes rigid skeleton to replace traditional atress reinforcing bar, optimizes high altitude reinforcing bar ligature to ground land and assembles, has guaranteed construction quality, through the setting of rigid skeleton, has reduced the input of facing the structure greatly, has practiced thrift construction cost. Optionally, the steel skeleton is pre-buried on the pier shaft lateral wall, rigid skeleton and steel skeleton welding are equipped with the connecting reinforcement on the steel skeleton, rigid skeleton is connected with connecting reinforcement planting muscle. Through above-mentioned technical scheme, through steel skeleton and connecting reinforcement cooperation, promoted the joint strength of rigidity skeleton and pier shaft. And the connection strength between the large cantilever structure formed after the concrete casting and forming and the pier body is also improved. Optionally, the external template includes die block, side form and side form, the die block is connected with the rigid skeleton through external pull rod, the side form is equipped with two sets ofly, two sets ofly the side form is located the rigid skeleton both sides relatively, two sets ofly the side form is connected through the counter-pulling screw, the side form is located the rigid skeleton and is kept away from the one end of pier shaft, the side form is connected with the rigid skeleton throu