High-intensity earthquake area bridge bearing platform embedded sleeve in-place device and construction method

Abstract

The invention provides a high-intensity earthquake area bridge bearing platform embedded sleeve in-place device and a construction method, and relates to the technical field of building construction.The high-intensity earthquake area bridge bearing platform embedded sleeve in-place device comprises three layers of positioning jig frames used for manufacturing a steel bar sleeve module, and the three layers of positioning jig frames are connected into a whole through an outer vertical frame; two long angle steels and two short angle steels are connected to form a quadrilateral frame, and a plurality of steel sleeves are uniformly arranged on the angle steels; the middle jig frame comprises a steel plate structure, and a through hole corresponding to the position and shape of the embedded sleeve is formed in the steel plate structure; the upper jig frame comprises a steel plate and a steel plate back rib welded to the back side of the steel plate, and a positioning sleeve is welded to the position, corresponding to the stressed steel bar, of the inner side of the steel plate; the outer vertical frame is composed of four steel angles arranged at the four corners of the three-layer positioning jig frame, and the three-layer positioning jig frame is detachably connected with the outer vertical frame through bolts. The construction method has the beneficial effects that positioning adjustment of the embedded steel bars is guaranteed through the reasonable construction method, and then accurate positioning of the pier column steel bars within the bearing platform range is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a device and construction method for positioning embedded sleeves in bridge abutments in high-intensity earthquake zones. Background Technology

[0002] With urban renewal and development, road projects often involve the reconstruction of existing roads. During the construction of municipal bridges, there is often a long period of road occupancy, impacting traffic. Precast assembly construction can accelerate construction progress and alleviate traffic congestion. Precast piers have thus emerged. Traditionally, precast piers are constructed by pre-embedding reinforcing steel bars at the pier cap and setting pre-embedded ducts within the pier itself. However, in high seismic intensity areas, to avoid the risk of weak points at the pier base caused by the traditional method, a new method is used: pre-embedding reinforcing steel bars within the pier and setting ducts within the pier cap. This method requires higher installation precision and is more challenging than traditional methods. The accurate positioning of the pre-embedded ducts within the pier cap has a significant impact on the subsequent installation of the precast pier.

[0003] How to solve the above-mentioned technical problems is the challenge facing this invention. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a device and construction method for positioning embedded sleeves in bridge piers in high-intensity earthquake zones, which ensures the positioning and adjustment of embedded reinforcing bars through reasonable construction methods, thereby guaranteeing the accurate positioning of pier column reinforcing bars within the pier cap area.

[0005] The technical solution adopted by the present invention to solve its technical problem is: the present invention provides a bridge abutment pre-embedded sleeve positioning device in a high-intensity earthquake zone, including a three-layer positioning frame for making steel sleeve modules, the three-layer positioning frame being connected as a whole by an external frame; The three-layer positioning frame includes: The bottom frame, used for positioning the lower part of the reinforcing cage, is a quadrilateral frame formed by connecting two long angle steels and two short angle steels. Several steel sleeves for positioning the stressed reinforcing bars are evenly arranged on the angle steels. The middle frame, used for positioning the lower part of the sleeve, includes a steel plate structure, on which through holes are opened corresponding to the position and shape of the pre-embedded sleeve; The upper frame is used for positioning the upper part of the sleeve. It includes a steel plate and a steel plate back rib welded to its back side. A positioning sleeve is welded to the inner side of the steel plate at the position corresponding to the stressed reinforcing bar, which is used to insert and fix the upper end of the stressed reinforcing bar. The external frame is composed of four angle steels set at the four corners of the three-layer positioning frame, and the three-layer positioning frame is detachably connected to the external frame by bolts.

[0006] The steel bar sleeve module includes a steel bar skeleton formed by binding reinforcing bars and stirrups. The steel plate structure of the central frame includes an outer positioning plate and an inner positioning plate. There are four outer positioning plates, which are fixedly connected end to end by corner plates to form a rectangle. The inner side of each of the four outer positioning plates is fixedly connected to the inner positioning plate. Several through holes are opened between the outer positioning plates and the inner positioning plates.

[0007] A construction method for a pre-embedded sleeve placement device for bridge abutments in high-intensity earthquake zones includes the following steps: S1: In the steel bar processing yard, fabricate steel bar sleeve modules: assemble the bottom frame, outer frame and middle frame in sequence, then tie the steel bar skeleton inside the frame and install and fix the pre-embedded sleeve, finally install the upper frame and fix it to the upper part of the steel bar skeleton, then remove the outer frame, bottom frame and middle frame, leaving only the upper frame and steel bar skeleton as a whole to form a steel bar sleeve module; S2: Transport the steel bar sleeve module to the bridge abutment construction site; S3: Before the construction of the foundation cushion layer, sleeves are installed at the designed positions of the reinforcing bars at the four corners of the pier column. S4: Hoist the rebar sleeve module onto the embedded sleeve, and insert two 10# I-beams on both sides of the bottom. Set up jacks under the I-beams, adjust the elevation of the rebar sleeve module, and then weld and fix the rebar sleeve module to the embedded sleeve and the bottom rebar of the foundation. S5: After fixing, remove the jacks and I-beams. S6. Tie the top reinforcement of the foundation. After tying, use "#" shaped structural reinforcement to weld and fix it to the top reinforcement of the foundation slab at the top of the reinforcement sleeve module. S7. Install adjusting steel pipes around the top of the rebar sleeve module, and fine-tune the planar position of the rebar sleeve module by cooperating with the adjusting steel pipes and jacks.

[0008] When the pier is an H-shaped pier, after the two steel sleeve modules are installed and positioned, a positioning frame is installed between them for connection and fixation.

[0009] The beneficial effects of this invention are as follows: This device and installation method use a three-layer detachable positioning jig to prefabricate sleeve modules in the factory, ensuring initial accuracy; on-site, the bottom embedded parts, adjustable I-beams and jacks are used to control the elevation, and the top adjusting steel pipe is used for fine-tuning of the plane, forming a positioning system of factory prefabrication and on-site multi-level adjustment, which effectively ensures the ability of the embedded sleeve to resist deformation during complex construction processes such as rebar binding and concrete pouring, and realizes the precise positioning requirements of bridge abutments in high-intensity earthquake zones. Attached Figure Description

[0010] Figure 1This is a schematic diagram of the bottom frame structure of the present invention.

[0011] Figure 2 This is a schematic diagram of the structure of the central frame of the present invention.

[0012] Figure 3 This is a schematic diagram of the upper frame structure of the present invention.

[0013] Figure 4 This is a schematic diagram of the assembly of the rebar sleeve module of the present invention.

[0014] Figure 5 This is a schematic diagram of the steel bar sleeve module of the present invention after the outer frame, bottom frame and middle frame have been removed.

[0015] Figure 6 This is a three-dimensional structural diagram of the rebar sleeve module of the present invention.

[0016] The reference numerals in the attached drawings are as follows: 1. Bottom frame; 101. Steel sleeve; 2. Middle frame; 201. Outer positioning plate; 202. Inner positioning plate; 203. Corner plate; 3. Upper frame; 301. Positioning sleeve; 302. Steel plate back rib; 4. Outer frame; 5. Steel reinforcement cage; 6. Reinforcing steel bars. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0018] See Figures 1 to 6 As shown, this embodiment is a pre-embedded sleeve positioning device for bridge abutment in a high-intensity earthquake zone, including a three-layer positioning frame for making steel sleeve modules. The three-layer positioning frame is connected as a whole by an external frame 4. The three-layer positioning frame includes: The bottom frame 1 is a quadrilateral frame welded from two No. 5 angle steels with a length of 164cm and two with a length of 184cm. Several steel sleeves 101 are evenly welded on the angle steels, and the height of the steel sleeves 101 is 8cm. The middle frame 2 includes a 6mm thick steel plate structure, and through holes are provided on the steel plate structure corresponding to the position and shape of the pre-embedded sleeve; The upper frame 3 includes a 6mm thick steel plate and a 6mm thick steel plate back rib 302 welded to its back side. A positioning sleeve 301 is welded to the inner side of the steel plate at the position corresponding to the stressed reinforcing bar 6. The outer frame 4 is composed of four No. 10 angle steels set at the four corners of the three-layer positioning frame. The three-layer positioning frame is detachably connected to the outer frame 4 by bolts.

[0019] The rebar sleeve module includes a rebar skeleton 5 formed by binding the stressed rebar 6 and stirrups. The steel plate structure of the middle frame 2 includes an outer positioning plate 201 and an inner positioning plate 202. There are four outer positioning plates 201, which are fixedly connected end to end by corner plates 203 to form a rectangle. The inner side of each of the four outer positioning plates 201 is fixedly connected to the inner positioning plate 202. Several through holes are opened between the outer positioning plates 201 and the inner positioning plates 202.

[0020] A construction method for a pre-embedded sleeve placement device for bridge abutments in high-intensity earthquake zones includes the following steps: S1: In the rebar processing yard, fabricate rebar sleeve modules: Assemble the bottom jig 1, outer frame 4, and middle jig 2 sequentially. Then, tie the rebar cage 5 inside the jig and install and fix the pre-embedded sleeves. Finally, install the upper jig 3 and fix it to the upper part of the rebar cage 5. Figure 4 As shown, the outer frame 4, bottom frame 1, and middle frame 2 are then removed, leaving only the upper frame 3 and the steel reinforcement cage 5 as a whole, forming a steel reinforcement sleeve module, as shown. Figure 5 As shown; S2: Transport the steel bar sleeve modules to the bridge abutment construction site; S3: Before the construction of the foundation cushion layer, sleeves are installed at the designed positions of the reinforcing bars at the four corners of the pier column. S4: Hoist the rebar sleeve module onto the embedded sleeve, and insert two 10# I-beams on both sides of the bottom. Set up jacks under the I-beams, adjust the elevation of the rebar sleeve module, and then weld and fix the rebar sleeve module to the embedded sleeve and the bottom rebar of the foundation. S5: After fixing, remove the jacks and I-beams. S6. Tie the top reinforcement of the foundation. After tying, use "#" shaped structural reinforcement to weld and fix it to the top reinforcement of the foundation slab at the top of the reinforcement sleeve module. S7. Install adjusting steel pipes around the top of the rebar sleeve module, and fine-tune the planar position of the rebar sleeve module by cooperating with the adjusting steel pipes and jacks.

[0021] When the pier is an H-shaped pier, after the two steel sleeve modules are installed and positioned, a positioning frame is installed between them for connection and fixation.

[0022] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A device for positioning a pre-embedded sleeve in a bridge pier cap in a high-intensity earthquake zone, characterized in that, Includes a three-layer positioning frame for making steel bar sleeve modules, the three-layer positioning frame being connected as a whole by an external frame (4); The three-layer positioning frame includes: The bottom frame (1) is a quadrilateral frame formed by connecting two long angle steels and two short angle steels, and several steel sleeves (101) are evenly arranged on the angle steels. The middle frame (2) includes a steel plate structure, on which through holes are provided corresponding to the position and shape of the pre-embedded sleeve; The upper frame (3) includes a steel plate and a steel plate back rib (302) welded to its back side. A positioning sleeve (301) is welded to the inner side of the steel plate at the position corresponding to the stressed steel bar (6). The outer frame (4) is composed of four angle steels set at the four corners of the three-layer positioning frame. The three-layer positioning frame is detachably connected to the outer frame (4) by bolts.

2. The bridge abutment pre-embedded sleeve positioning device in high-intensity earthquake zones according to claim 1, characterized in that, The steel bar sleeve module includes a steel bar skeleton (5) formed by binding the reinforcing bars (6) and stirrups.

3. The pre-embedded sleeve positioning device for bridge abutments in high-intensity earthquake zones according to claim 1, characterized in that, The steel plate structure of the middle frame (2) includes an outer positioning plate (201) and an inner positioning plate (202). There are four outer positioning plates (201) and they are fixedly connected end to end by corner plates (203) to form a rectangle. The inner side of each of the four outer positioning plates (201) is fixedly connected to the inner positioning plate (202). Several through holes are opened between the outer positioning plate (201) and the inner positioning plate (202).

4. A construction method for a bridge pier pre-embedded sleeve placement device as described in claim 1 in a high-intensity earthquake zone, characterized in that, Includes the following steps: S1: Fabricate steel bar sleeve modules in the steel bar processing yard; S2: Transport the steel bar sleeve module to the bridge abutment construction site; S3: Before the construction of the foundation pad, sleeves are installed at the designed positions of the reinforcing bars at the four corners of the pier column. S4: Hoist the rebar sleeve module onto the embedded sleeve, and insert two I-beams on both sides of the bottom. Set up jacks under the I-beams, adjust the elevation of the rebar sleeve module, and then weld and fix the rebar sleeve module to the embedded sleeve and the bottom rebar of the foundation. S5: After fixing, remove the jacks and I-beams.

5. The construction method of the bridge pier pre-embedded sleeve placement device in high-intensity earthquake zones according to claim 4, characterized in that, Step S1 specifically includes: Assemble the bottom frame (1), the outer frame (4) and the middle frame (2) in sequence. Then tie the steel reinforcement cage (5) inside the frame and install the pre-embedded sleeve. Finally, install the upper frame (3) and fix it to the upper part of the steel reinforcement cage (5). Subsequently, the outer frame (4), bottom frame (1) and middle frame (2) are removed, leaving only the upper frame (3) and the steel reinforcement skeleton (5) as a whole to form the steel reinforcement sleeve module.

6. The construction method of the bridge pier pre-embedded sleeve placement device in high-intensity earthquake zones according to claim 4, characterized in that, When the pier is an H-shaped pier, after the two steel sleeve modules are installed and positioned, a positioning frame is installed between them for connection and fixation.

7. The construction method of the bridge pier pre-embedded sleeve placement device in high-intensity earthquake zones according to claim 4, characterized in that, It also includes step S6: After binding the top reinforcement of the foundation, use "#" shaped reinforcement to weld and fix it to the top reinforcement of the foundation slab at the top of the reinforcement sleeve module.

8. The construction method of the bridge pier pre-embedded sleeve placement device in high-intensity earthquake zones according to claim 4, characterized in that, It also includes step S7: Adjustable steel pipes are installed around the top of the rebar sleeve module, and the planar position of the rebar sleeve module is finely adjusted by cooperating with jacks through the adjustment steel pipes.

9. The construction method of the bridge pier pre-embedded sleeve placement device in high-intensity earthquake zones according to claim 1, characterized in that, In step S4, the I-beam is a 10# I-beam.

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