CN115070925B - Long and short line combined prefabrication method for segment assembled continuous beam - Google Patents
Long and short line combined prefabrication method for segment assembled continuous beam Download PDFInfo
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- CN115070925B CN115070925B CN202210874418.XA CN202210874418A CN115070925B CN 115070925 B CN115070925 B CN 115070925B CN 202210874418 A CN202210874418 A CN 202210874418A CN 115070925 B CN115070925 B CN 115070925B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
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Abstract
The invention belongs to the technical field of bridge construction, and particularly relates to a long and short line combined prefabrication method for a segmental assembling continuous beam; the concrete construction steps are as follows: s1: prefabricating a shared 0# segment at one end of the prefabricating pedestal; s2: prefabricating a side span side segment at the other end of the prefabricating pedestal; s3: prefabricating adjacent sections by taking the side span side section as a matching section; s4: sequentially matching the prefabricated middle segment to the 2# segment; s5: one end of the common beam adjusting trolley is a 2# section, and the other end of the common beam adjusting trolley is used for hoisting the common 0# section to the beam adjusting trolley to be adjusted to a matching position; s6: prefabricating a segment No. 1; s7: sequentially lifting and storing the poured prefabricated sections, and pouring the midspan side section; s8: pouring the middle sections to 2#' sections in sequence; s9: one end of the beam adjusting trolley is used as a matching section, the other end of the beam adjusting trolley is used for hoisting the shared 0# section to the beam adjusting trolley to adjust to a matching position, and the 1# section is poured; s10: and (4) sequentially lifting and storing the prefabricated sections, and repeating the steps to prefabricate the next T-shaped section.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a long and short line combined prefabrication method for a segmental assembling continuous beam.
Background
With the rapid development of high-speed railway construction in China and the continuous rise of labor cost and time cost, the competitiveness of the segment prefabrication and assembly technology must be continuously improved. The prefabricated bridge construction mode is adopted, so that the prefabricated bridge construction mode actively responds to national policies, a green development concept is realized, an important gripper for engineering management specialization, standardization, informatization and refinement is realized, the construction quality of a bridge can be effectively improved, the structure safety and durability are improved, and the whole life cycle cost is reduced. The segment assembled continuous beam is a development trend of the high-speed railway bridge industry, the main construction method for prefabricating the segment assembled beam at present has a long line method and a short line method, and the advantages and the disadvantages of the long line method are that: all beam sections forming the beam body are poured in the movable template on the fixed pedestal, splicing surfaces of adjacent sections are mutually attached and poured, and an isolating agent is smeared before pouring of the splicing surfaces so as to facilitate demoulding. The bridge has the advantages that the pedestal is fixed reliably, the bridge body line type is better after the bridge is formed, the defects are that the occupied area is larger, the foundation is required to be firm, and the pouring and the maintenance of the concrete are moved and dispersed. The short-line method comprises the following steps: the beam section is poured in a die of which the fixed pedestal can move longitudinally. And (3) arranging a fixed mould frame at one end of the beam section to be cast, arranging the beam section to be cast (matched) at the other end of the beam section to be cast, conveying out the original matched beam section after the beam section is cast after the beam section reaches the strength after the beam section is cast, and matching the beam section to be cast for the beam section to be cast below according to the strength requirement, wherein the steps are repeated in such a way that the pedestal only needs 3 beam sections. The adjustable bottom and side forms have the advantages that the occupied area is small, the casting templates and the equipment basically do not need to be moved, the prefabrication of the horizontal and vertical curved beam sections is facilitated due to the adjustable bottom and side forms, the precision requirement is high, the construction requirement is strict, and the construction period is relatively long.
Disclosure of Invention
The invention aims to provide a construction method for long and short line combined prefabrication of a continuous beam assembled on a high-speed railway section.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a long and short line combined prefabrication method for a segmental assembling continuous beam is characterized in that an integral continuous beam is divided into two T-shaped prefabricated sections by taking a mid-span closure section as a boundary according to a beam shape; the prefabricated sections connected with the main piers in each T-structure prefabricated section serve as shared 0# sections, the shared 0# sections are sequentially 1# ' sections, 2# ' sections and 3# ' sections … … midspan side sections in the starting direction and the midspan closure section direction, and the shared 0# sections are sequentially 1# sections, 2# sections and 3# sections … … side-span side sections in the starting direction and the side-span direction;
the concrete construction steps are as follows:
s1: prefabricating a shared 0# segment at one end of the prefabricating pedestal;
s2: prefabricating a side span side segment at the other end of the prefabricating pedestal;
s3: the side span side segment is used as a matching segment to prefabricate adjacent segments, and the 0# segment is shared to be adjusted away and stored after reaching the design strength;
s4: sequentially matching the prefabricated middle segment to the 2# segment;
s5: one end of the common beam adjusting trolley is a 2# section, and the other end of the common beam adjusting trolley is used for hoisting the common 0# section to the beam adjusting trolley to be adjusted to a matching position;
s6: prefabricating a segment No. 1;
s7: sequentially lifting and storing the poured prefabricated sections, and pouring the midspan side section;
s8: sequentially pouring the middle sections to 2#' sections;
s9: one end of the beam adjusting trolley is used as a matching section, the other end of the beam adjusting trolley is used for hoisting the shared 0# section to the beam adjusting trolley to adjust to a matching position, and the 1# section is poured;
s10: and (4) sequentially lifting and storing the prefabricated sections, and repeating the steps to prefabricate the next T-shaped section.
Furthermore, the length of the prefabricating pedestal is the length of a continuous beam side span, steel support legs are arranged at the bottom of the prefabricating pedestal and are welded and fixed with embedded steel plates on a concrete foundation, and a bottom die is arranged on the prefabricating pedestal.
Furthermore, the prefabricated sections are tightly attached to the matching sections during pouring, and an isolating agent is smeared before pouring of the seam surfaces.
Furthermore, the beam adjusting trolley is arranged at one end of the prefabricated pedestal and used for adjusting the line type of the common 0# segment as a matching segment, the longitudinal and transverse displacement of the support and the position of the plane are adjusted in a rotating mode through a hydraulic system, and the height of the support is adjusted through the jacking oil cylinder.
Compared with the prior art, the invention has the advantages that:
according to the long-short line combined prefabrication method for the segmental assembled continuous beam, provided by the invention, the defects and shortcomings in the prior art are effectively overcome by optimizing the long line prefabrication method and the short line prefabrication method, and the aims of controllable prefabrication line, shorter construction time, less construction occupied space, obvious cost control and the like are fulfilled.
Drawings
Fig. 1 is a schematic view of a prefabrication sequence of segmental erection of continuous beam in example 1.
Fig. 2 is a schematic diagram of a prefabrication sequence of the segmental assembled continuous beam in the embodiment 1.
Fig. 3 is a schematic diagram of a prefabrication sequence of the segment assembled continuous beam in the embodiment 1.
In the figure: 8-mid-span closure section; 9-prefabricating a pedestal; 10-adjusting the beam trolley.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
As shown in fig. 1, 2, and 3: a long and short line combined prefabrication method for a segmental assembling continuous beam comprises a prefabrication pedestal and a beam adjusting trolley; the length of the prefabricated pedestal is the length of a continuous beam side span, steel support legs are arranged at the bottom of the prefabricated pedestal and are welded and fixed with pre-buried steel plates on a concrete foundation, and a bottom die is arranged on the prefabricated pedestal. Dividing the integrated continuous beam into two T-shaped prefabricated sections by taking the mid-span closure section as a boundary according to the beam shape; the prefabricated sections connected with the main piers in each T-structure prefabricated section serve as shared 0# sections, the shared 0# sections are sequentially 1# ' sections, 2# ' sections and 3# ' sections … … midspan side sections in the direction from the midspan closure section, and the shared 0# sections are sequentially 1# sections, 2# sections and 3# sections … … side-span side sections in the direction from the midspan closure section.
Example 1
As shown in fig. 1, the present embodiment is described by taking an example in which each T-configuration prefabricated section includes 13 prefabricated sections.
The concrete construction steps are as follows:
s1: prefabricating a shared 0# segment at one end of the prefabricating pedestal;
s2: prefabricating an edge span side section, namely a 7# section, at the other end of the prefabricating pedestal;
s3: the side span side segment is used as a matching segment to prefabricate an adjacent segment, namely a 7# segment is used as a matching segment to prefabricate a 6# segment, and the shared 0# segment is taken away and stored after reaching the design strength;
s4: sequentially matching the prefabricated middle segment to the 2# segment, namely prefabricating the 5# segment by taking the 6# segment as a matching segment after prefabrication of the 6# segment is finished; after the prefabrication of the 5# segment is finished, the 5# segment is used as a matching segment to prefabricate the 4# segment; after the prefabrication of the 4# segment is finished, prefabricating the 3# segment by taking the 4# segment as a matching segment; after the prefabrication of the 3# segment is finished, prefabricating the 2# segment by taking the 3# segment as a matching segment;
s5: one end of the common beam adjusting trolley is a 2# section, and the other end of the common beam adjusting trolley is used for hoisting the common 0# section to the beam adjusting trolley to be adjusted to a matching position;
s6: prefabricating a segment No. 1;
s7: sequentially lifting and storing the poured prefabricated sections, and pouring midspan side sections, namely 5#' sections;
s8: pouring the middle sections to 2# ' sections in sequence, namely prefabricating 4# ' sections by taking 5# ' sections as matching sections; after prefabricating the 4# ' segment, prefabricating the 3# ' segment by taking the 4# ' segment as a matching segment; after the prefabrication of the 3# ' segment is finished, prefabricating a 2# ' segment by taking the 3# ' segment as a matching segment;
s9: one end of the beam adjusting trolley is used as a matching section, the other end of the beam adjusting trolley is used for hoisting the shared 0# section to the beam adjusting trolley to adjust to a matching position, and the 1# section is poured;
s10: and (4) sequentially lifting and storing the prefabricated sections, and repeating the steps to prefabricate the next T-shaped section.
In order to facilitate demolding, the prefabricated sections are tightly attached to the matching sections during pouring, and an isolating agent is smeared before pouring of the joint surface.
The beam adjusting trolley is arranged at one end of the prefabricated pedestal and used for adjusting the line type of the shared 0# section as a matching section, the horizontal and vertical displacement and the rotary adjustment plane position of the support are adjusted through a hydraulic system, and the height of the support is adjusted through the jacking oil cylinder.
The prefabricating method has the advantages that: compared with the long-line method prefabrication construction, the problems of large occupied area, large pedestal investment, high cost, low template utilization rate and the like are effectively avoided, and the advantage that the long-line method prefabrication line is easy to control is also kept. In the short-line prefabrication construction, because the bottom die is short, and the line type of the bridge after the bridge is formed is greatly influenced by the correct positions of the bottom die, the side die and the front section serving as the matched end die, the requirements on the prefabrication precision of the sections are very strict, and the prefabrication quality is not easy to control. After the construction by adopting the prefabricating method, the segment of the T structure is divided into two sections for prefabricating, so that the precision requirement of the prefabricating construction by a short line method is effectively reduced, the time for adjusting the template back and forth is reduced, and the construction period is also ensured. The prefabricating construction method is particularly suitable for prefabricating construction of the segmental assembling continuous beam.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A long and short line combined prefabricating method for a segment-assembled continuous beam is characterized by comprising the following steps of: dividing the integrated continuous beam into two T-shaped prefabricated sections by taking the mid-span closure section as a boundary according to the beam shape; the prefabricated sections connected with the main piers in each T-structure prefabricated section serve as shared 0# sections, the shared 0# sections are sequentially 1# ' sections, 2# ' sections and 3# ' sections … … midspan side sections in the starting direction and the midspan closure section direction, and the shared 0# sections are sequentially 1# sections, 2# sections and 3# sections … … side-span side sections in the starting direction and the side-span direction;
the concrete construction steps are as follows:
s1: prefabricating a shared 0# segment at one end of the prefabricating pedestal;
s2: prefabricating a side span side segment at the other end of the prefabricating pedestal;
s3: the side span side segment is used as a matching segment to prefabricate adjacent segments, and the 0# segment is shared to be adjusted away and stored after reaching the design strength;
s4: sequentially matching the prefabricated middle segment to the No. 2 segment;
s5: one end of the common beam adjusting trolley is a 2# section, and the other end of the common beam adjusting trolley is used for hoisting the common 0# section to the beam adjusting trolley to be adjusted to a matching position;
s6: prefabricating a segment No. 1;
s7: sequentially lifting and storing the poured prefabricated sections, and pouring the midspan side section;
s8: pouring the middle sections to 2#' sections in sequence;
s9: one end of the beam adjusting trolley is used as a matching section, the other end of the beam adjusting trolley is used for hoisting the shared 0# section to the beam adjusting trolley to adjust to a matching position, and the 1# section is poured;
s10: and (4) sequentially hoisting and storing the prefabricated sections, and repeating the steps to prefabricate the next T-shaped section.
2. The length and length combined prefabrication method of the segmental assembling continuous beam according to claim 1, wherein: the length of the prefabricated pedestal is the length of a continuous beam side span, steel support legs are arranged at the bottom of the prefabricated pedestal and are welded and fixed with pre-buried steel plates on a concrete foundation, and a bottom die is arranged on the prefabricated pedestal.
3. The length and length combined prefabrication method of the segmental assembling continuous beam according to claim 1, wherein: the prefabricated sections are tightly attached to the matching sections during pouring, and an isolating agent is smeared before pouring of the seam surfaces.
4. The long and short line combined prefabrication method for the segmental assembling continuous beam as claimed in claim 2, wherein the method comprises the following steps of: the beam adjusting trolley is arranged at one end of the prefabricated pedestal and used for adjusting the line type of the shared 0# section as a matching section, adjusting the position of a plane through longitudinal and transverse displacement and rotation of the hydraulic system adjusting support and adjusting the height of the support through the jacking oil cylinder.
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