Cast-in-place beam of plain concrete pile foundation support and construction method of cast-in-place beam

Abstract

The invention discloses a plain concrete pile foundation support cast-in-place beam and a construction method thereof, and the construction method comprises the steps of firstly constructing plain concrete piles and erecting a strip-shaped foundation, constructing a supporting support on the strip-shaped foundation, erecting a plate buckle scaffold on the supporting support, and then erecting a beam template and constructing a beam body structure. The problem that the bearing capacity of a cast-in-place bridge construction foundation is insufficient under the deep soft foundation geological condition can be effectively solved, the construction technology is complete, the construction process is safe, quality control is effective, follow-up large-area plain concrete pile support cast-in-place beam construction can be effectively guided, driving movement can be conducted through the carrying and moving mechanism structure, and the construction efficiency is improved. And during moving, the whole parts can be moved, so that the moving is more efficient and convenient, the whole body can be effectively ensured, and the subsequent building construction is more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, in particular to a plain concrete pile foundation support cast-in-place beam and a construction method thereof. Background Art

[0002] Bridge construction refers to the process of building a bridge according to the design content, mainly referring to bridge construction technology and construction organization, construction management, construction quality and other contents. In construction, bridge, aviation and pipeline projects, a beam with three or more supports is often encountered, which is called a continuous beam.

[0003] During the construction and erection of the existing cast-in-place beams, after the Bailey beam construction is completed, the entire beam cannot be disassembled and moved effectively and quickly. Most of the disassembly and movement is done by personnel, and then the beam is erected later, which makes the subsequent construction not very efficient.

[0004] Therefore, it is necessary to provide a plain concrete pile foundation support cast-in-place beam and a construction method thereof to solve the above technical problems. Summary of the Invention

[0005] The object of the present invention is to provide a cast-in-place beam of a plain concrete pile foundation support and a construction method thereof, so as to solve the problem in the above-mentioned background technology that the existing cast-in-place beam cannot be effectively and quickly disassembled and moved after the Bailey beam is completed during construction and erection, and it is mostly disassembled and moved by personnel and then erected, which makes the subsequent construction not very efficient.

[0006] In order to solve the above technical problems, the present invention provides the following technical solution: a method for constructing a cast-in-place beam with a plain concrete pile foundation support, comprising first constructing plain concrete piles and setting up a strip foundation, constructing a support support on the strip foundation, setting up a buckle scaffold on the support support, and then setting up a beam formwork and constructing the beam structure. The method is characterized in that:

[0007] S1: Site leveling. Clear the working surface according to the construction drawings. Mechanically level the construction site first. The leveling elevation is 50 cm above the design elevation of the top of the plain concrete pile. Excavate and fill the uneven areas with clay or medium-coarse sand. Refer to the foundation treatment design drawings for the leveling range. Reserve a 2% to 4% horizontal slope on the leveling surface for drainage. The width of the leveling site extends outward by 3 to 4 meters to ensure that the construction position of the pile foundation is flat.

[0008] S2: Plain concrete pile construction. The construction process is as follows: pile position setting → pile driver positioning and installation → drilling → mixing material pumping → driver relocation → cleaning and leveling → pile head removal → acceptance. After the concrete strength reaches the design value, the pile top is polished and leveled according to the test requirements. The single pile bearing capacity is then tested using a flat plate static load test. One pile is randomly selected for inspection.

[0009] S3: Scaffolding

[0010] (1) Erection of the support, including steel pipe columns and Bailey beams. Before constructing the steel pipe columns, pre-buried steel plates are placed on the strip foundation. Triangular steel plates are used around the pre-buried steel plates as tie plates and evenly welded to reinforce them. Steel pipe columns are welded on the pre-buried steel plates. The bottom of the steel pipe columns are connected with channel steel.

[0011] (2) A steel plate is welded above the steel pipe column. The size of the steel plate is 7000×7000×200mm. A crossbeam is set above the steel plate. The crossbeam is made of double or triple I-beams. The I-beam is welded to the steel plate on the steel pipe column and angle steel is used as an eight-shaped support to prevent displacement. The gap between the I-beam and the steel plate is filled with steel plates and fully welded;

[0012] (3) The longitudinal Bailey beams are laid on the I-beams. The Bailey beams are arranged in groups of three or two. The special-shaped Bailey beams are processed synchronously according to the curve shape of the box beam. The Bailey beams in each group are connected laterally by standard support frames. To prevent the Bailey beams from moving sideways, a limiter is welded on the side of the Bailey lower chord on the load-bearing beam.

[0013] (4) Lay transverse I-beam distribution beams on top of the Bailey beams. The spacing between the distribution beams at the bottom, web thickening section, diaphragm and beam end solid section is 60 cm, and the spacing at other parts is 120 cm. Then, set up a disc-type scaffolding on the transverse distribution beams, and set limiters at the connection between the transverse I-beam distribution beams and the Bailey beams.

[0014] S4: Construction of scaffolding with buckles

[0015] (1) The longitudinal direction of the scaffolding is arranged according to the horizontal distribution beam spacing. I-beams are installed on the top support of the vertical poles along the bridge direction. Square timber is laid horizontally above the I-beams, and bamboo plywood formwork is laid on top of the I-beams.

[0016] (2) Determine the support height based on the actual on-site layout, combine the socket-type vertical poles, the top adjustable brackets and the bottom adjustable base. If the support vertical poles are located within the range of the bridge piers, the vertical poles can be placed under the beams;

[0017] (3) Vertical diagonal bars should be set on each layer of the first span of the outer facade of the scaffolding frame. Vertical diagonal bars should be set on the bottom and top layers of the frame. The inclination angle of the diagonal bars to the ground should be 45°-60°, and the diagonal bars and vertical bars should be connected by buckles;

[0018] (4) Set up support scissor braces. Vertical diagonal bars shall be set up on each layer of the first span on the inner facade of the support frame. Vertical diagonal bars shall be set up on the bottom and top layers of the entire frame. Vertical diagonal bars or horizontal scissor braces with fasteners and steel pipes shall be set up in the vertical and horizontal directions from the bottom to the top every 5 spans in the internal area of the frame.

[0019] S5: Bracket preload

[0020] Prestressing monitoring is carried out on the erected supports. Monitoring sections are set at both ends of the prestressing area and at the positions of L / 4, L / 2, and 3 / 4L. Measuring points are arranged at the bottom and middle positions of the top plate and the middle position of the web at the side span interface. Five monitoring points are arranged on the foundation of each monitoring section and on the center line of the symmetrical concrete beam on the top surface of the support to detect the settlement value during the prestressing process. According to the settlement value, the weak position is adjusted and the support is readjusted;

[0021] S6: Concrete pouring

[0022] The box girder is cast in sections and layers, and the prestressed pipes are tied and sealed in place; before pouring concrete, an elevation strip is set every 5m and marked. When pouring the top plate concrete, channel steel is used to scrape it flat, and then the surface is manually finished according to the elevation marks.

[0023] Furthermore, a transfer track is provided on the crossbeam in the S3 bracket erection, and a transporting and moving mechanism is provided on the transfer track, wherein the transporting and moving mechanism is connected to a Bailey frame. When centering, the Bailey frame is moved left and right by the hydraulic cylinder of the transporting and moving mechanism to ensure accurate positioning; when it is necessary to move to the next working condition to install the Bailey frame, the Bailey frame is moved as a whole to the next working condition by centering the transfer track and coordinating the movement of the hydraulic cylinder.

[0024] Furthermore, the method includes constructing a plurality of plain concrete piles at certain positions in the deep silt soil layer, wherein the plain concrete piles are friction piles, and setting reinforced concrete strip foundations on the pile tops of the plain concrete piles.

[0025] A cast-in-situ beam of a plain concrete pile foundation support, comprising the cast-in-situ beam construction method of the plain concrete pile foundation support according to any one of claims 1-2, wherein a plurality of plain concrete piles are provided at the lower end of the strip foundation, a plurality of steel pipe columns are provided at the upper end of the plain concrete piles, a connection assembly is provided between the steel pipe columns, a pile head is provided at the upper end of the pile head, a pile top distribution beam is provided at the upper end of the pile top distribution beam, a Bailey beam is provided at the upper end of the Bailey beam, a scaffolding bottom distribution beam is provided at the upper end of the scaffolding bottom distribution beam, and a buckle foot is provided at the upper end of the scaffolding bottom distribution beam. The hand scaffolding is provided with a box beam body at the upper end of the disc-shaped scaffolding, and the disc-shaped scaffolding and the box beam body are fixedly connected by a pull rod; a demoulding pad is provided between the pile top distribution beam and the pile head; the Bailey beam and the scaffolding bottom distribution beam are provided with a limiter; the connecting assembly includes a cross-connecting rod, a rod connecting block and a transverse connecting rod, and rod connecting blocks are provided at both ends of the cross-connecting rod, and a transverse connecting rod is provided between the two rod connecting blocks, and the rod connecting block is connected to the steel pipe column; the Bailey beam is moved by the transporting and moving mechanism when it is transported and moved.

[0026] Furthermore, the transporting and moving mechanism includes a track walking machine base, a hydraulic telescopic cylinder, a sliding shoe, a locking mechanism and a transfer rail, the upper end of the transfer rail is provided with a track walking machine base, the outer end of the track walking machine base is movably provided with a hydraulic telescopic cylinder through a pin shaft, the front end of the piston rod of the hydraulic telescopic cylinder is movably provided with a sliding shoe through a pin shaft, the sliding shoe and the Bailey frame are fixedly connected by a pin, and are locked by a locking mechanism after being transported to a set position; when the sliding shoe is sleeved on the transfer rail to convert the working condition, the transfer rail with similar working conditions is connected according to the setting of the transfer rail, so as to facilitate the overall movement of the Bailey frame, the hydraulic telescopic cylinder retracts and pulls the track walking machine base to move forward on the transfer rail to the maximum stroke, the track walking machine base is fixed on the transfer rail through the locking mechanism, and then the piston rod of the hydraulic telescopic cylinder is extended to drive the sliding shoe to move forward on the transfer rail to the maximum stroke, and move back and forth, and the transfer rail includes a first rail and a second rail.

[0027] Furthermore, the cross-connecting rod and the rod body connecting block are fixedly connected by screws.

[0028] Furthermore, the locking mechanism includes a locking coupling, a locking telescopic cylinder, a locking sleeve, a locking hard plate, a locking inner oblique movable block, a locking rebound spring, and a locking movable cone head; the locking inner oblique movable block is installed and fixed in the sleeve holes at both ends of the locking sleeve, and a locking rebound spring is provided between the two locking inner oblique movable blocks. The locking hard plate is welded and connected to the movable end of the locking inner oblique movable block, and the oblique edge of the locking inner oblique movable block is located inside the locking inner oblique movable block and a locking movable cone head is provided. The rear end of the locking movable cone head is fixed with a locking telescopic cylinder through a locking coupling, and the locking telescopic cylinder is connected to the outer wall of the track walking machine base by screws, and the locking sleeve is fixed to the inner wall of the track walking machine base by screws.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The overall construction method can effectively solve the problem of insufficient bearing capacity of the foundation for cast-in-place bridge construction under deep soft ground conditions. The construction process is perfect, and safety and quality control are effective during the construction process. It can effectively guide the subsequent construction of large-scale plain concrete pile support cast-in-place beams;

[0031] 2. By carrying the mobile mechanism structure, it can be driven to move. When moving, the entire component can be moved, which is more efficient and convenient when moving, and can effectively ensure the overall structure, making it more convenient when setting up construction later. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 It is a schematic diagram of the side construction and erection structure of the present invention;

[0034] Figure 2 It is a schematic diagram of the bottom erection structure of the present invention;

[0035] Figure 3 It is a schematic diagram of the structure of the Bailey beam, pile top distribution beam and limiter of the present invention;

[0036] Figure 4 This is a schematic diagram of the Bailey beam and limiter assembly structure of the present invention;

[0037] Figure 5 Schematic diagram of the steel pipe pile and connection system structure of the present invention;

[0038] Figure 6 It is a schematic structural diagram of the transport and movement mechanism of the present invention;

[0039] Figure 7It is a structural schematic diagram of the locking mechanism of the present invention.

[0040] In the figure: 1. Box girder body; 2. Pull rod; 3. Disc-type scaffolding; 4. Bailey beam; 5. Scaffolding bottom distribution beam; 6. Pile top distribution beam; 7. Pile head; 8. Connection system; 81. Cross connecting rod; 82. Rod body connecting block; 83. Horizontal connecting rod; 9. Steel pipe column; 10. Strip foundation; 11. Plain concrete pile; 12. Limiter; 13. Track walking machine base; 14. Hydraulic telescopic cylinder; 15. Slide shoe; 16. Transfer rail; 17. Demoulding pad; 18. Transport and moving mechanism; 19. Locking mechanism; 191. Locking coupling; 192. Locking telescopic cylinder; 193. Locking sleeve block; 194. Locking hard plate; 195. Locking inner inclined movable block; 196. Locking rebound spring; 197. Locking movable cone head. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Example 1

[0043] See also Figure 1-Figure 7 The present invention provides a technical solution: a method for constructing a cast-in-place beam of a plain concrete pile foundation support, comprising first constructing a plain concrete pile 11 and setting up a strip foundation 10, constructing a support support on the strip foundation 10, setting up a buckle scaffolding 3 on the support support, and then setting up a beam formwork and constructing a beam structure. The method is characterized in that:

[0044] S1: Site leveling. Clear the working surface according to the construction drawings. Mechanically level the construction site first. The leveling elevation is 50 cm above the design elevation of the top of the plain concrete pile 11. Excavate and fill the uneven areas with clay or medium-coarse sand. Refer to the foundation treatment design drawings for the leveling range. Reserve a 2% to 4% horizontal slope on the leveling surface for drainage. The width of the leveling site extends outward by 3 to 4 meters to ensure that the construction position of the pile foundation is flat.

[0045] S2: Construction of plain concrete piles 11. The construction process is as follows: pile position setting → pile driver positioning and installation → drilling → mixing material pumping → driver relocation → cleaning and leveling → pile head 7 removal → acceptance. After the concrete strength reaches the design value, the pile top is polished and leveled according to the test requirements. The single pile bearing capacity is then tested using a flat plate static load test. One pile is randomly selected for inspection.

[0046] S3: Scaffolding

[0047] (1) Erection of the support, including the steel pipe column 9 and the Bailey beam 3. Before constructing the steel pipe column 9, a steel plate is pre-buried on the strip foundation 10. Triangular steel plates are used around the pre-buried steel plate as gussets for uniform welding and reinforcement. The steel pipe column 9 is welded on the pre-buried steel plate. The bottom of the steel pipe column 9 is connected with channel steel;

[0048] (2) A steel plate is welded above the steel pipe column 9. The steel plate has a size of 7000×7000×200 mm. A crossbeam is set above the steel plate. The crossbeam is made of double or triple I-beams. The I-beam is welded to the steel plate on the steel pipe column 9 and angle steel is used as an eight-shaped support to prevent displacement. The gap between the I-beam and the steel plate is filled with steel plates and fully welded;

[0049] (3) The longitudinal Bailey beams are laid on the I-beams. The Bailey beams are arranged in groups of three or two. The special-shaped Bailey beams 3 are processed synchronously according to the curve shape of the box beam. The three Bailey beams in each group are connected laterally using standard support frames. To prevent the Bailey beams from moving sideways, a limiter 12 is welded on the side of the Bailey lower chord on the load-bearing beam.

[0050] (4) Lay a transverse I-beam distribution beam on the top of the Bailey beam 3. The spacing between the distribution beams at the bottom, web thickening section, diaphragm and beam end solid section is 60 cm, and the spacing at other parts is 120 cm. Then, set up a disc-type scaffolding on the transverse distribution beam, and set a limiter 12 at the connection between the transverse I-beam distribution beam and the Bailey beam 3;

[0051] S4: Construction of scaffolding 3

[0052] (1) The scaffolding 3 is arranged longitudinally according to the horizontal distribution beam spacing. I-beams are set on the top supports of the vertical poles along the bridge direction. Square timber is laid horizontally above the I-beams, and bamboo plywood formwork is laid on top of the I-beams.

[0053] (2) Determine the support height based on the actual on-site layout, combine the socket-type vertical poles, the top adjustable brackets and the bottom adjustable base. If the support vertical poles are located within the range of the bridge piers, the vertical poles can be placed under the beams;

[0054] (3) Vertical diagonal bars should be set on each layer of the first span of the outer facade of the scaffolding 3 frame. Vertical diagonal bars should be set on the bottom and top layers of the frame. The angle between the diagonal bars and the ground should be 45°-60°. The diagonal bars and the vertical bars should be connected by a buckle.

[0055] (4) Set up support scissor braces. Vertical diagonal bars shall be set up on each layer of the first span on the inner facade of the support frame. Vertical diagonal bars shall be set up on the bottom and top layers of the entire frame. Vertical diagonal bars or horizontal scissor braces with fasteners and steel pipes shall be set up in the vertical and horizontal directions from the bottom to the top every 5 spans in the internal area of the frame.

[0056] S5: Bracket preload

[0057] Prestressing monitoring is carried out on the erected supports. Monitoring sections are set at both ends of the prestressing area and at the positions of L / 4, L / 2, and 3 / 4L. Measuring points are arranged at the bottom and middle positions of the top plate and the middle position of the web at the side span interface. Five monitoring points are arranged on the foundation of each monitoring section and on the center line of the symmetrical concrete beam on the top surface of the support to detect the settlement value during the prestressing process. According to the settlement value, the weak position is adjusted and the support is readjusted;

[0058] S6: Concrete pouring

[0059] The box girder is cast in sections and layers, and the prestressed pipes are tied and sealed in place; before pouring concrete, an elevation strip is set every 5m and marked. When pouring the top plate concrete, channel steel is used to scrape it flat, and then the surface is manually finished according to the elevation marks.

[0060] It also includes a transfer track provided on the crossbeam in the S3 bracket erection, and a transporting and moving mechanism is provided on the transfer track, wherein the transporting and moving mechanism is connected to a Bailey frame, and when centering, the Bailey frame is moved left and right by the hydraulic cylinder of the transporting and moving mechanism to ensure accurate positioning; when it is necessary to move to the next working condition to install the Bailey frame, the Bailey frame is moved as a whole to the next working condition through the centering of the transfer track and the movement of the hydraulic cylinder. The transporting and moving mechanism can determine the moving direction through the transfer track, and then the transporting and moving mechanism can creep on the transfer track, thereby driving the Bailey frame at the upper end of the transporting and moving mechanism to move, so that it can be moved to the next working condition for use.

[0061] The cast-in-place beam construction method of the plain concrete pile foundation support includes constructing a number of plain concrete piles at certain positions in the deep silt soil layer. The plain concrete piles are friction piles, and reinforced concrete strip foundations are set on the top of the plain concrete piles, so that the overall foundation is more stable and firm, and not easy to be damaged, effectively improving the overall service life.

[0062] The construction method of cast-in-place beams with plain concrete pile foundation supports effectively solves the problem of insufficient bearing capacity of the foundation for cast-in-place bridge construction under deep soft ground conditions. The construction process is perfect, and safety and quality control are effective during the construction process. It can effectively guide the subsequent construction of large-scale cast-in-place beams with plain concrete pile supports.

[0063] Example 2

[0064] like Figure 1 、 Figure 2 、 Figure 3 and Figure 5A cast-in-place beam of a plain concrete pile foundation support, a plurality of plain concrete piles 11 are provided at the lower end of the strip foundation 10, a plurality of steel pipe columns 9 are provided at the upper end of the plain concrete piles 11, a connecting assembly is provided between the steel pipe columns 9, a pile head 7 is provided at the upper end of the pile head 7, a pile top distribution beam 6 is provided at the upper end of the pile top distribution beam 6, a Bailey beam 4 is provided at the upper end of the Bailey beam 4, a scaffolding bottom distribution beam 5 is provided at the upper end of the scaffolding bottom distribution beam 5, a disc buckle scaffolding 3 is provided at the upper end of the disc buckle scaffolding 3 is provided with a box beam body 1 at the upper end, and the buckle scaffolding 3 and the box beam body 1 are fixedly connected by a tie rod 2; a demoulding pad 17 is provided between the pile top distribution beam 6 and the pile head 7; a limiter 12 is provided between the Bailey beam 4 and the scaffolding bottom distribution beam 5; the connection assembly includes a cross connecting rod 81, a rod connecting block 82 and a transverse connecting rod 83, and a rod connecting block 82 is provided at both ends of the cross connecting rod 81. A transverse connecting rod 83 is provided between the two rod connecting blocks 82, and the rod connecting block 82 is connected to the steel pipe The Bailey beam 4 is moved by the transport mechanism 18 during transportation. The strip foundation 10 can be effectively and stably supported by the multiple plain concrete piles 11 below, dispersing the overall downward pressure. The steel pipe column 9 on the strip foundation 10 is effectively pulled by the connection system 8, so that the steel pipe column 9 can be positioned and placed. The steel pipe column 9 can support the pile top distribution beam 6 through the upper pile head 7. The area above the pile top distribution beam 6 can support the scaffolding bottom distribution beam 6 due to the Bailey beam 4 above the pile top distribution beam 6. Beam 5, a buckle scaffolding 3 can be set up above the bottom distribution beam 5 of the scaffolding. The buckle scaffolding 3 and the box beam body 1 are fixedly connected by the pull rod 2, so that they can be erected for construction. The Bailey beam 4 can be quickly transported to the next working condition through the transport and movement mechanism 18 during transportation. The rod connection block 82 of the connecting system 8 is integrally connected to the steel pipe column 9, so that the cross connecting rod 81 and the transverse connecting rod 83 on the inner side of the rod connection block 82 can be effectively pulled and used, so that the steel pipe column 9 can be stably supported and used.

[0065] Example 3

[0066] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5The transport and moving mechanism 18 includes a track walking machine base 13, a hydraulic telescopic cylinder 14, a sliding shoe 15, a locking mechanism 19 and a transfer rail 16. The upper end of the transfer rail 16 is provided with a track walking machine base 13, and the outer end of the track walking machine base 13 is provided with a hydraulic telescopic cylinder 14 through a pin shaft. The front end of the piston rod of the hydraulic telescopic cylinder 14 is provided with a sliding shoe 15 through a pin shaft. The sliding shoe 15 and the Bailey frame are fixedly connected by a pin and are locked by the locking mechanism 19 after being transported to the set position; when the sliding shoe 15 is sleeved on the transfer rail 16 and the working condition is converted, the transfer rail 16 with a similar working condition is connected according to the setting of the transfer rail 16, so as to facilitate the overall movement of the Bailey frame, and the hydraulic telescopic cylinder 14 retracts and pulls the track walking machine base 13 in the transfer The transport rail 16 moves forward to the maximum stroke, the rail traveler seat 13 is fixed on the transport rail 16 by the locking mechanism 19, and then the piston rod of the hydraulic telescopic cylinder 14 is extended to drive the sliding shoe 15 to move forward to the maximum stroke on the transport rail 16, and moves back and forth. The transport rail 16 includes a first rail and a second rail. The transport rail 16 of the handling and moving mechanism 18 can determine the overall moving direction and position, and the rail traveler seat 13 passing through the upper end of the transport rail 16 can be driven forward. The hydraulic telescopic cylinder 14 on the rail traveler seat 13 can be hydraulically extended, and the hydraulic telescopic cylinder 14 can be extended to drive the sliding shoe 15 to move on the transport rail 16, and the transfer rail 16 drives the upper end of the Bailey beam 4 to move.

[0067] Example 4

[0068] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6, the locking mechanism 19 includes a locking coupling 191, a locking telescopic cylinder 192, a locking sleeve 193, a locking hard plate 194, a locking inner oblique movable block 195, a locking rebound spring 196, and a locking movable cone head 197; the locking inner oblique movable block 195 is installed and fixed in the sleeve holes at both ends of the locking sleeve 193, and a locking rebound spring 196 is provided between the two locking inner oblique movable blocks 195. The locking hard plate 194 is welded to the movable end of the locking inner oblique movable block 195, and the bevel of the locking inner oblique movable block 195 is located inside the locking inner oblique movable block 195 and a locking movable cone head 197 is provided. The rear end of the locking movable cone head 197 is fixed with a locking telescopic cylinder 192 through the locking coupling 191. The locking telescopic cylinder 192 is connected to the outer wall of the track walking machine base by screws, and the locking sleeve 193 is screwed to the track walking machine On the inner wall of the seat, when the piston rod of the locking telescopic cylinder 192 of the locking mechanism 19 is extended, the locking telescopic cylinder 192 drives the locking coupling 191 to move forward, and the locking coupling 191 drives the locking movable cone head 197 to move forward. When moving forward, the locking movable cone head 197 conflicts with the inclined surface of the locking inner oblique movable block 195, so that the locking inner oblique movable block 195 moves outward in the locking sleeve block 193, and the locking inner oblique movable block 195 drives the locking hard plate 194 to conflict with the track walking machine seat 13, so that it can be locked and fixed. When the locking movable cone head 197 is separated from the locking inner oblique movable block 195, the locking inner oblique movable block 195 is pulled back to its original position by the locking rebound spring 196, so that the locking hard plate 194 at the outer end of the locking inner oblique movable block 195 is separated from the track walking machine seat 13, so that it can be opened for walking.

[0069] Working principle: After the construction steps of S1, S2, S3, S4, S5 and S6, the problem of insufficient bearing capacity of the foundation of cast-in-place bridge construction under deep soft ground conditions is effectively solved. The construction process is perfect, and the safety and quality control are effective during the construction process. It can effectively guide the construction of subsequent large-scale plain concrete pile supports for cast-in-place beams. In addition, during the erection construction, the strip foundation 10 can be effectively and stably supported by the multiple plain concrete piles 11 below, dispersing the overall downward pressure. The steel pipe column 9 on the strip foundation 10 is effectively pulled by the connection system 8, so that the steel pipe column 9 can be positioned and placed, and the steel pipe column 9 can support the upper end pile head 7. The pile top distribution beam 6 and the area above the pile top distribution beam 6 can support the scaffolding bottom distribution beam 5 due to the Bailey beam 4 above the pile top distribution beam 6. A buckle scaffolding 3 can be set up above the scaffolding bottom distribution beam 5. The buckle scaffolding 3 and the box beam body 1 are fixedly connected by the pull rod 2, so that they can be erected for construction. During transportation, the Bailey beam 4 can be quickly transported to the next working condition through the transportation and moving mechanism 18. The rod connection block 82 of the connecting system 8 is integrally connected to the steel pipe column 9, so that the cross connecting rod 81 and the transverse connecting rod 83 on the inside of the rod connection block 82 can be effectively pulled and used, so that the steel pipe column 9 can be stably supported and used.

[0070] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0071] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for constructing cast-in-situ beams with plain concrete pile foundation supports, comprising first constructing plain concrete piles and setting up strip foundations, constructing support supports on the strip foundations, setting up a buckle scaffold on the support supports, and then setting up beam formwork and constructing the beam structure, characterized in that: The specific construction method includes: S1: Site leveling. Clear the working surface according to the construction drawings. Mechanically level the construction site first. The leveling elevation is 50 cm above the design elevation of the top of the plain concrete pile. Excavate and fill the uneven areas with clay or medium-coarse sand. Refer to the foundation treatment design drawings for the leveling range. Reserve a 2% to 4% horizontal slope on the leveling surface for drainage. The width of the leveling site extends outward by 3 to 4 meters to ensure that the construction position of the pile foundation is flat. S2: Plain concrete pile construction. The construction process is as follows: pile position setting → pile driver positioning and installation → drilling → mixing material pumping → driver relocation → cleaning and leveling → pile head removal → acceptance. After the concrete strength reaches the design value, the pile top is polished and leveled according to the test requirements. The single pile bearing capacity is then tested using a flat plate static load test. One pile is randomly selected for inspection. S3: Scaffolding (1) Erection of the support, including steel pipe columns and Bailey beams. Before constructing the steel pipe columns, pre-buried steel plates are placed on the strip foundation. Triangular steel plates are used around the pre-buried steel plates as tie plates and evenly welded to reinforce them. Steel pipe columns are welded on the pre-buried steel plates. The bottom of the steel pipe columns are connected with channel steel. (2) A steel plate is welded above the steel pipe column. The size of the steel plate is 7000×7000×200mm. A crossbeam is set above the steel plate. The crossbeam is made of double or triple I-beams. The I-beam is welded to the steel plate on the steel pipe column and angle steel is used as an eight-shaped support to prevent displacement. The gap between the I-beam and the steel plate is filled with steel plates and fully welded; (3) The longitudinal Bailey beams are laid on the I-beams. The Bailey beams are arranged in groups of three or two. The special-shaped Bailey beams are processed synchronously according to the curve shape of the box beam. The Bailey beams in each group are connected laterally by standard support frames. To prevent the Bailey beams from moving sideways, a limiter is welded on the side of the Bailey lower chord on the load-bearing beam. (4) Lay transverse I-beam distribution beams on top of the Bailey beams. The spacing between the distribution beams at the bottom, web thickening section, diaphragm and beam end solid section is 60 cm, and the spacing at other parts is 120 cm. Then, set up a disc-type scaffolding on the transverse distribution beams, and set limiters at the connection between the transverse I-beam distribution beams and the Bailey beams. S4: Construction of scaffolding with buckles (1) The scaffolding is arranged longitudinally according to the horizontal distribution beam spacing. I-beams are installed on the top supports of the vertical poles along the bridge direction. Square timber is laid horizontally above the I-beams, and bamboo plywood formwork is laid on top of the I-beams. (2) Determine the support height based on the actual on-site layout, combine the socket-type vertical poles, the top adjustable brackets and the bottom adjustable base. If the support vertical poles are located within the range of the bridge piers, the vertical poles can be placed under the beams; (3) Vertical diagonal bars should be set on each layer of the first span of the outer facade of the scaffolding frame. Vertical diagonal bars should be set on the bottom and top layers of the frame. The inclination angle of the diagonal bars to the ground should be 45°-60°, and the diagonal bars and vertical bars should be connected by buckles; (4) Set up support scissor braces. Vertical diagonal bars shall be set up on each layer of the first span on the inner facade of the support frame. Vertical diagonal bars shall be set up on the bottom and top layers of the entire frame. Vertical diagonal bars or horizontal scissor braces with fasteners and steel pipes shall be set up in the vertical and horizontal directions from the bottom to the top every 5 spans in the internal area of the frame. S5: Bracket preload Prestressing monitoring is carried out on the erected supports. Monitoring sections are set at both ends of the prestressing area and at the positions of L / 4, L / 2, and 3 / 4L. Measuring points are arranged at the bottom and middle positions of the top plate and the middle position of the web at the side span interface. Five monitoring points are arranged on the foundation of each monitoring section and on the center line of the symmetrical concrete beam on the top surface of the support to detect the settlement value during the prestressing process. According to the settlement value, the weak position is adjusted and the support is readjusted; S6: Concrete pouring The box girder is cast in sections and layers, and the prestressed pipes are tied and sealed in place; before pouring concrete, an elevation strip is set every 5m and marked. When pouring the top plate concrete, channel steel is used to scrape it flat, and then the surface is manually finished according to the elevation marks.

2. The method for constructing a cast-in-situ beam of a plain concrete pile foundation support according to claim 1, characterized in that: It also includes a transfer track provided on the crossbeam in the S3 bracket erection, and a transport and movement mechanism provided on the transfer track, wherein the transport and movement mechanism is connected to a Bailey frame. When centering, the Bailey frame is moved left and right by the hydraulic cylinder of the transport and movement mechanism to ensure accurate positioning; when it is necessary to move to the next working condition to install the Bailey frame, the Bailey frame is moved as a whole to the next working condition by centering the transfer track and coordinating the movement of the hydraulic cylinder.

3. The method for constructing a cast-in-situ beam of a plain concrete pile foundation support according to claim 1, characterized in that: The method includes constructing a number of plain concrete piles at certain positions in a deep silt soil layer. The plain concrete piles are friction piles, and reinforced concrete strip foundations are set on the tops of the plain concrete piles.

4. A cast-in-place beam of a plain concrete pile foundation support, comprising the cast-in-place beam construction method of a plain concrete pile foundation support according to any one of claims 1 to 3, characterized in that: The lower end of the strip foundation is provided with a plurality of plain concrete piles, the upper end of the plain concrete piles is provided with a plurality of steel pipe columns, and a connecting assembly is provided between the steel pipe columns, the upper end of the steel pipe column is provided with a pile head, the upper end of the pile head is provided with a pile top distribution beam, the upper end of the pile top distribution beam is provided with a Bailey beam, the upper end of the Bailey beam is provided with a scaffolding bottom distribution beam, the upper end of the scaffolding bottom distribution beam is provided with a disc scaffold, the upper end of the disc scaffolding is provided with a box beam body, the disc scaffolding and the box beam body are fixedly connected by a pull rod; a demoulding pad is provided between the pile top distribution beam and the pile head; the Bailey beam and the scaffolding bottom distribution beam are provided with a limiter; the connecting assembly includes a cross-connecting rod, a rod connecting block and a transverse connecting rod, a rod connecting block is provided at both ends of the cross-connecting rod, a transverse connecting rod is provided between the two rod connecting blocks, and the rod connecting block is connected to the steel pipe column; the Bailey beam is moved by a transporting and moving mechanism when it is transported and moved.

5. The plain concrete pile foundation support cast-in-place beam according to claim 3, characterized in that: The transporting and moving mechanism includes a track walking machine seat, a hydraulic telescopic cylinder, a sliding shoe, a locking mechanism and a transfer rail, the upper end of the transfer rail is provided with a track walking machine seat, the outer end of the track walking machine seat is movably provided with a hydraulic telescopic cylinder through a pin shaft, and the front end of the piston rod of the hydraulic telescopic cylinder is movably provided with a sliding shoe through a pin shaft, the sliding shoe and the Bailey frame are fixedly connected by a pin, and are locked by a locking mechanism after being transported to a set position; when the sliding shoe is sleeved on the transfer rail to convert the working condition, the transfer rail with similar working conditions is connected according to the setting of the transfer rail, so as to facilitate the overall movement of the Bailey frame, the hydraulic telescopic cylinder retracts and pulls the track walking machine seat to move forward on the transfer rail to the maximum stroke, the track walking machine seat is fixed on the transfer rail by the locking mechanism, and then the piston rod of the hydraulic telescopic cylinder is extended to drive the sliding shoe to move forward on the transfer rail to the maximum stroke, and walk reciprocatingly, and the transfer rail includes a first rail and a second rail.

6. The plain concrete pile foundation support cast-in-place beam according to claim 4, characterized in that: The cross-connecting rod and the rod body connecting block are fixedly connected by screws.

7. The plain concrete pile foundation support cast-in-place beam according to claim 3, characterized in that: The locking mechanism includes a locking coupling, a locking telescopic cylinder, a locking sleeve, a locking hard plate, a locking inner oblique movable block, a locking rebound spring, and a locking movable cone head; the locking inner oblique movable block is installed and fixed in the sleeve holes at both ends of the locking sleeve, and a locking rebound spring is provided between the two locking inner oblique movable blocks. The locking hard plate is welded and connected to the movable end of the locking inner oblique movable block, and the oblique edge of the locking inner oblique movable block is located inside the locking inner oblique movable block and a locking movable cone head is provided. The rear end of the locking movable cone head is fixed with a locking telescopic cylinder through a locking coupling, and the locking telescopic cylinder is connected to the outer wall of the track walking machine base by screws, and the locking sleeve is screwed to the inner wall of the track walking machine base.

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