PK segmental beam high-altitude prefabricated support structure

Abstract

The utility model discloses a PK segmental beam high-altitude prefabricated support structure which comprises side box support systems and a bilateral inter-box support system, the side box support systems are arranged on the two sides of the bilateral inter-box support system, and each side box support system comprises a side box pile foundation, a side box bearing platform, a side box steel pipe stand column supporting structure, a side box steel mold supporting structure and a side box steel mold structure. The side box steel mold supporting structure is connected with the side box steel mold supporting structure sliding rail, the double-side-box support system comprises a middle pile foundation, a middle bearing platform, a middle steel pipe stand column supporting structure and a middle area formwork supporting frame body, and the middle steel pipe stand column supporting structure comprises an upper frame body and a lower frame body. The two sides of the upper frame body are connected with the inner side of the side box steel pipe stand column supporting structure through telescopic jacks, a lifting adjusting device is arranged on the top of the lower frame body, and the lower frame body is arranged below the upper frame body in a sliding mode. The problems that when an existing ultra-wide PK type box girder is prefabricated through a high-altitude support method, demolding is difficult, and a girder body is prone to cracking are solved.

Description

Technical Field

[0001] The utility model relates to the field of bridge engineering construction, in particular to a PK segment beam high-altitude prefabricated bracket structure. Background Art

[0002] For ultra-wide concrete beam bridges, the short-line segment prefabrication method is currently the main construction method. For prefabricated PK segmental beams, there are generally two methods: ground prefabrication and high-altitude support prefabrication. As the acquisition and demolition of construction land becomes increasingly difficult, the high-altitude support prefabrication process is becoming more and more common, because it does not require a large area of ​​site (prefabrication site and beam storage site) and does not require the use of large-scale transportation equipment and lifting equipment, which greatly reduces the construction cost.

[0003] However, for the extra-wide PK box girders, the prefabrication by the high-altitude support method currently has the following disadvantages: 1. Because there are generally two horizontal partitions between the double-sided boxes and the double-sided boxes have no bottom plate, it is difficult to demould the formwork in this area after prefabrication on the high-altitude support. At present, manual demoulding is generally adopted, and the formwork is disassembled into small pieces and transported manually. During installation, the formwork is transported and installed manually, which greatly reduces the construction efficiency and increases the safety of personnel; 2. If the area is lowered as a whole using large steel formwork, a truss system is generally used to bear the load. For the extra-wide PK beam, the middle span is large and the rigidity requirements of the truss are high, resulting in an abnormally high operating risk. If the rigidity of the truss is small, it is easy to cause the beam body to crack. Utility Model Content

[0004] The utility model aims to provide a PK segment beam high-altitude prefabricated support structure to solve the problems of difficulty in demoulding and easy cracking of the beam body when the existing ultra-wide PK box beam is prefabricated by the high-altitude support method.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A PK segmental beam high-altitude prefabricated support structure, comprising a side box support system and a bilateral box-inter-box support system, the side box support system being arranged on both sides of the bilateral box-inter-box support system, the side box support system comprising a side box pile foundation, a side box pedestal, a side box steel pipe column support structure, a side box steel mold support structure and a side box steel mold structure which are arranged in sequence from bottom to top, a side box steel pipe column support structure sliding track is provided in the middle of the top of the side box steel pipe column support structure, the side box steel mold support structure is connected to the side box steel mold support structure sliding track, the bilateral box-inter-box support system comprising a middle pile foundation, a middle pedestal, a middle steel pipe column support structure and a middle area formwork support frame which are arranged in sequence from bottom to top, the middle steel pipe column support structure comprising an upper frame and a lower frame, the lower parts of both sides of the upper frame are connected to the upper parts of the inner sides of the side box steel pipe column support structure through telescopic jacks, the top of the lower frame is provided with a lifting and adjusting device, and the lower frame is slidably arranged below the upper frame through the support sliding track.

[0007] As a further preferred embodiment of the present invention, the side box steel pipe column supporting structure includes side box steel pipe columns, side box column top beams, side box lifting jacks, side box distribution beam connecting beams and side box distribution beams. The side box steel pipe columns include side box outer columns, side box middle columns and side box inner columns. The side box column top beams are arranged on the top of the side box middle columns. The side box steel mold supporting structure sliding track is arranged in the middle of the top surface of the side box column top beam. The side box lifting jacks are arranged on both sides of the bottom surface of the side box distribution beam connecting beam. The side box outer columns and the side box middle columns are connected by the side box distribution beam connecting beam. The side box inner columns and the side box middle columns are also connected by the side box distribution beam connecting beam. The side box distribution beam is arranged on the top of the side box distribution beam connecting beam.

[0008] As a further preferred embodiment of the present invention, side box column parallel connections and side box column diagonal braces are further provided between the side box steel pipe columns.

[0009] As a further preference of the utility model, the side box steel mold structure includes a flange outer steel mold and a side box bottom steel mold arranged in sequence from the outside to the inside, and a transverse jack is also provided on the outside of the flange outer steel mold, and the transverse jack is connected to the top surface of the side box distribution beam connecting the side box steel pipe column support structure.

[0010] As a further preferred embodiment of the present invention, the upper frame includes upper frame steel pipe columns, upper frame column top cross beams and upper frame distribution beams which are arranged in sequence from bottom to top.

[0011] As a further preferred embodiment of the present invention, upper frame column parallel connections and upper frame column diagonal braces are further provided between the upper frame steel pipe columns.

[0012] As a further preferred embodiment of the present invention, the lower frame includes lower frame steel pipe columns, and lower frame column parallel connections and lower frame column diagonal braces are provided between the lower frame steel pipe columns.

[0013] As a further preferred embodiment of the utility model, the bracket sliding track includes a side box platform sliding track and a middle platform sliding track, and the side box platform sliding track and the middle platform sliding track are respectively arranged on the inner side of the side box platform top surface and the middle of the middle platform top surface.

[0014] First, construct the support pile foundation and pedestal. When constructing the pedestal, pay attention to the embedded parts connected to the steel pipe columns, set up the steel pipe columns and their parallel diagonal bracing system, continue to set up the column top beam upwards, install the lifting jack, set up the side box distribution beam connecting the beam and the distribution beam, install the flange outer steel formwork, the side box bottom steel formwork, and the side box middle area formwork support frame, install the box girder sliding track and sliding support system, debug and improve other auxiliary systems of the support and formwork, and then pour the box girder concrete.

[0015] After the segmental beam is poured, the demoulding operation is carried out: Step 1: Start the lifting jacks of the steel formwork on the outer side of the flange and the steel formwork on the bottom of the side box, so that the upper formwork moves downward as a whole, and the formwork and the concrete surface are separated from each other up and down; Step 2: Start the transverse jack of the steel formwork on the outer side of the flange, so that the steel formwork on the outer side of the flange moves horizontally outward as a whole, and the formwork and the concrete surface are separated horizontally; Step 3: The telescopic jack is started so that it can bear the weight of the upper frame; Step 4: Adjust the lifting and adjusting device between the upper and lower frames to shorten it downward to complete the separation of the upper and lower frames; Step 5: Use a hand-held winch to pull the lower frame to move it longitudinally to create space for the overall lowering of the upper frame; Step 6: Start the telescopic jack to extend it and lower the upper frame by 3m, completing the separation of the formwork support frame and the concrete in the middle area without causing the segmental beam to be unable to slide longitudinally due to the obstruction of the cross partitions at both ends; Step 7: At this point, the cast segmental beam and the entire formwork support system The system is completely detached, and the traction device of the box beam can be started to make it move out longitudinally along the sliding track smoothly; Step 8: Start pouring the next segment beam, first lift the lifting jacks of the outer steel formwork of the flange and the bottom steel formwork of the side box to meet the height requirements; Step 9: Start the transverse jack of the outer steel formwork of the flange to make the outer steel formwork of the flange move horizontally inward as a whole to complete the mold closing operation of the template; Step 10: Start the telescopic jack to shorten it and raise the upper frame by 3m to complete the mold closing operation of the template support frame in the middle area; Step 11: Use a hand-held winch to pull the lower steel pipe support to move it longitudinally to the bottom of the upper frame, and adjust the lifting and lowering adjustment device to press against the upper frame steel pipe column of the upper frame; Step 12: Unload the telescopic jack slowly to complete the conversion of the force system of the upper and lower frames of the template support frame in the middle area; Step 13: Pour the segment beam concrete, and the subsequent operations cycle steps 1 to 12 until all segment beams are poured.

[0016] Compared with the prior art, the utility model can achieve at least one of the following beneficial effects:

[0017] 1. Since there are usually two transverse partitions in the middle of the ultra-wide PK box girder, it is difficult to demould the formwork of the internal cavity after prefabrication on the high-altitude bracket. The structural form of this bracket can cleverly avoid this influence, so that it can be demoulded quickly and conveniently in situ without blocking the longitudinal sliding of the segmental beam.

[0018] 2. The support structure adopts floor-standing steel pipe support, which has strong bearing capacity and high support rigidity. It will not cause segment beam cracking due to weak support system rigidity, thus increasing the safety performance of the whole system.

[0019] 3. This support structure is combined with a large number of automated hydraulic systems, making the opening and closing of the template convenient and easy to operate, achieving less-manpower or even unmanned operation, and further enhancing the human safety of the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cross-sectional view of the prefabricated bracket of the utility model when the bilateral inter-box bracket system is in a supporting state.

[0021] Figure 2 This is a cross-sectional view of the prefabricated bracket of the utility model when the bilateral inter-box bracket system is in a supporting state.

[0022] Figure 3 It is a longitudinal elevation view of the upper and lower frames of the utility model when they are moving. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Specific embodiment 1:

[0030] Figure 1 , Figure 2 , Figure 3A PK segment beam high-altitude prefabricated support structure is shown, including a side box support system and a bilateral box-to-box support system, wherein the side box support system is arranged on both sides of the bilateral box-to-box support system, and the side box support system includes a side box pile foundation 1, a side box cap 2, a side box steel pipe column support structure 3, a side box steel mold support structure 4 and a side box steel mold structure 5 which are arranged in sequence from bottom to top, and a side box steel mold support structure sliding track 6 is provided in the middle of the top of the side box steel pipe column support structure 3, and the side box steel mold support structure 3 is connected to the side box steel mold support structure sliding track 6 The bilateral box support system includes a middle pile foundation 7, a middle pedestal 8, a middle steel pipe column support structure 9 and a middle area formwork support frame 10 arranged in sequence from bottom to top. The middle steel pipe column support structure 9 includes an upper frame 91 and a lower frame 92. The lower parts of both sides of the upper frame 91 are connected to the upper part of the inner side of the side box steel pipe column support structure 3 through telescopic jacks 911. The top of the lower frame 92 is provided with a lifting and adjusting device 921. The lower frame 92 is slidably arranged below the upper frame 91 through a support sliding track 11. Specific embodiment 2:

[0032] This embodiment further illustrates the side box steel pipe column support structure 31 on the basis of the specific embodiment 1. The side box steel pipe column support structure 3 includes a side box steel pipe column 31, a side box column top cross beam 32, a side box lifting jack 33, a side box distribution beam connecting cross beam 34 and a side box distribution beam 35. The side box steel pipe column 31 includes a side box outer column 311, a side box middle column 312 and a side box inner column 313. The side box column top cross beam 32 is arranged on the top of the side box middle column 312. The side box steel mold supporting structure sliding track 6 is arranged in the middle of the top surface of the side box column top beam 32, the side box lifting jack 33 is arranged on both sides of the bottom surface of the side box distribution beam connecting beam 34, the side box outer column 311 and the side box middle column 312 are connected by the side box distribution beam connecting beam 34, the side box inner column 313 and the side box middle column 312 are also connected by the side box distribution beam connecting beam 34, and the side box distribution beam 35 is arranged on the top of the side box distribution beam connecting beam 34. Specific embodiment 3:

[0034] This embodiment further illustrates the side box steel pipe column support structure 31 on the basis of the specific embodiment 2, and side box column parallel connections and side box column diagonal braces are further provided between the side box steel pipe columns 31. Specific embodiment 4:

[0036] This embodiment further illustrates the side box steel mold structure 4 based on the specific embodiment 1, and the side box steel mold structure 4 includes a flange outer steel mold 41 and a side box bottom steel mold 42 arranged in sequence from the outside to the inside, and a transverse jack 411 is also provided on the outside of the flange outer steel mold 41, and the transverse jack 411 is connected to the top surface of the side box distribution beam connecting the side box steel pipe column support structure 3. Specific embodiment 5:

[0038] This embodiment further illustrates the upper frame 91 based on the specific embodiment 1. The upper frame 91 includes an upper frame steel pipe column 912, an upper frame column top cross beam 913 and an upper frame distribution beam 914 arranged in sequence from bottom to top. Specific embodiment 6:

[0040] This embodiment further illustrates the upper frame steel pipe columns 912 on the basis of the specific embodiment 5, and upper frame column parallel connections and upper frame column diagonal braces are further provided between the upper frame steel pipe columns 912. Specific embodiment 7:

[0042] This embodiment further illustrates the lower frame 92 based on the specific embodiment 1. The lower frame 92 includes lower frame steel pipe columns. Lower frame column parallel connections and lower frame column diagonal braces are provided between the lower frame steel pipe columns. Specific embodiment 8:

[0044] This embodiment further explains the bracket sliding rail 11 on the basis of the specific embodiment 1. The bracket sliding rail 11 includes a side box platform sliding rail 111 and a middle platform sliding rail 112. The side box platform sliding rail 111 and the middle platform sliding rail 112 are respectively arranged on the inner side of the top surface of the side box platform 2 and in the middle of the top surface of the middle platform 8.

[0045] After the segmental beam is poured, the demoulding operation is carried out: Step 1: Start the lifting jacks of the steel formwork on the outer side of the flange and the steel formwork on the bottom of the side box, so that the upper formwork moves downward as a whole, and the formwork and the concrete surface are separated from each other up and down; Step 2: Start the transverse jack of the steel formwork on the outer side of the flange, so that the steel formwork on the outer side of the flange moves horizontally outward as a whole, and the formwork and the concrete surface are separated horizontally; Step 3: The telescopic jack is started so that it can bear the weight of the upper frame; Step 4: Adjust the lifting and adjusting device between the upper and lower frames to shorten it downward to complete the separation of the upper and lower frames; Step 5: Use a hand-held winch to pull the lower frame to move it longitudinally to create space for the overall lowering of the upper frame; Step 6: Start the telescopic jack to extend it and lower the upper frame by 3m, completing the separation of the formwork support frame and the concrete in the middle area without causing the segmental beam to be unable to slide longitudinally due to the obstruction of the cross partitions at both ends; Step 7: At this point, the cast segmental beam and the entire formwork support system The system is completely detached, and the traction device of the box beam can be started to make it move out longitudinally along the sliding track smoothly; Step 8: Start pouring the next segment beam, first lift the lifting jacks of the outer steel formwork of the flange and the bottom steel formwork of the side box to meet the height requirements; Step 9: Start the transverse jack of the outer steel formwork of the flange to make the outer steel formwork of the flange move horizontally inward as a whole to complete the mold closing operation of the template; Step 10: Start the telescopic jack to shorten it and raise the upper frame by 3m to complete the mold closing operation of the template support frame in the middle area; Step 11: Use a hand-held winch to pull the lower steel pipe support to move it longitudinally to the bottom of the upper frame, and adjust the lifting and lowering adjustment device to press against the upper frame steel pipe column of the upper frame; Step 12: Unload the telescopic jack slowly to complete the conversion of the force system of the upper and lower frames of the template support frame in the middle area; Step 13: Pour the segment beam concrete, and the subsequent operations cycle steps 1 to 12 until all segment beams are poured. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PK segment beam high-altitude prefabricated support structure, characterized by: The invention comprises a side box support system and a bilateral box support system, wherein the side box support system is arranged on both sides of the bilateral box support system, and the side box support system comprises a side box pile foundation (1), a side box cap (2), a side box steel pipe column support structure (3), a side box steel mold support structure (5) and a side box steel mold structure (4) which are arranged in sequence from bottom to top, and a side box steel mold support structure sliding track (6) is arranged in the middle of the top of the side box steel pipe column support structure (3), and the side box steel mold support structure (5) is connected to the side box steel mold support structure sliding track (6). The bilateral box support system comprises a side box pile foundation (1), a side box cap (2), a side box steel pipe column support structure (3), a side box steel mold support structure sliding track (6) and a side box steel mold support structure sliding track (6) which are arranged in sequence from bottom to top. A middle pile foundation (7), a middle pedestal (8), a middle steel pipe column support structure (9) and a middle area formwork support frame (10) are sequentially arranged on the upper part, wherein the middle steel pipe column support structure (9) comprises an upper frame (91) and a lower frame (92), wherein the lower parts of both sides of the upper frame (91) are connected to the upper part of the inner side of the side box steel pipe column support structure (3) via telescopic jacks (911), and a lifting and adjusting device (921) is provided on the top of the lower frame (92), and the lower frame (92) is slidably arranged below the upper frame (91) via a bracket sliding track (11).

2. The high-altitude prefabricated support structure of PK segment beam according to claim 1 is characterized by: The side box steel tube column support structure (3) comprises a side box steel tube column (31), a side box column top crossbeam (32), a side box lifting jack (33), a side box distribution beam connecting crossbeam (34) and a side box distribution beam (35); the side box steel tube column (31) comprises a side box outer column (311), a side box middle column (312) and a side box inner column (313); the side box column top crossbeam (32) is arranged on the top of the side box middle column (312); the side box steel mold support structure sliding track (6) is arranged In the middle of the top surface of the side box column top crossbeam (32), the side box lifting jack (33) is arranged on both sides of the bottom surface of the side box distribution beam connecting crossbeam (34), the side box outer column (311) and the side box middle column (312) are connected through the side box distribution beam connecting crossbeam (34), the side box inner column (313) and the side box middle column (312) are also connected through the side box distribution beam connecting crossbeam (34), and the side box distribution beam (35) is arranged on the top of the side box distribution beam connecting crossbeam (34).

3. The high-altitude prefabricated support structure of PK segment beam according to claim 1 is characterized by: A side box column parallel connection and a side box column diagonal brace are also provided between the side box steel pipe columns (31).

4. The high-altitude prefabricated support structure of PK segment beam according to claim 1 is characterized in that: The side box steel mold structure (4) comprises a flange outer steel mold (41) and a side box bottom steel mold (42) which are arranged in sequence from the outer side to the inner side. A transverse displacement jack (411) is also arranged on the outer side of the flange outer steel mold (41). The transverse displacement jack (411) is connected to the top surface of the side box distribution beam connecting the cross beam of the side box steel pipe column support structure (3).

5. The high-altitude prefabricated support structure of PK segment beam according to claim 1 is characterized by: The upper frame (91) comprises an upper frame steel pipe column (912), an upper frame column top cross beam (913), and an upper frame distribution beam (914) which are arranged in sequence from bottom to top.

6. The high-altitude prefabricated support structure of PK segment beam according to claim 5 is characterized in that: Upper frame column parallel connections and upper frame column diagonal braces are also provided between the upper frame steel pipe columns (912).

7. The high-altitude prefabricated support structure of PK segment beam according to claim 1 is characterized by: The lower frame (92) comprises lower frame steel pipe columns, and lower frame column parallel connections and lower frame column diagonal braces are provided between the lower frame steel pipe columns.

8. The high-altitude prefabricated support structure of PK segment beam according to claim 1 is characterized by: The support sliding track (11) comprises a side box support platform sliding track (111) and a middle support platform sliding track (112), and the side box support platform sliding track (111) and the middle support platform sliding track (112) are respectively arranged on the inner side of the top surface of the side box support platform (2) and in the middle of the top surface of the middle support platform (8).

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