Bridge main pier bearing platform construction structure

Abstract

The invention relates to a bridge main pier bearing platform construction structure, and belongs to the field of bridge structure construction.The bridge main pier bearing platform construction structure comprises a main pier column and a supporting bearing platform, the main pier column comprises a plurality of unit precast blocks which are vertically arranged, the main pier column further comprises a cast-in-place body, and the cast-in-place body is formed through cast-in-place of concrete; the cast-in-place body is fixedly connected with the unit precast blocks. According to the main pier column, the multiple prefabricated unit prefabricated blocks are adopted for assembly type construction, and the construction efficiency of the main pier column is improved.

Description

Technical Field

[0001] The present application relates to the field of bridge structure construction, and in particular to a bridge main pier cap construction structure. Background Art

[0002] The bridge pier is a substructure that supports the bridge span structure and transmits the dead load and vehicle live load to the foundation. Its function is to support the bridge span structure. For a bridge with a larger width, the pier column below is also larger in volume. A cap is set on the top of the pier column. The cap is located between the bridge and the pier column. The cap supports the bridge across the width of the bridge. The pier column has multiple support points on the cap.

[0003] At present, the construction method of most bridge piers is still mainly cast-in-place. For large bridge piers, there are many cast-in-place construction processes, from pier reinforcement binding, formwork installation, concrete pouring to maintenance, the cycle is long, the on-site workload is large, and the construction progress cannot be guaranteed. Summary of the invention

[0004] In order to improve the above problems, the present application provides a bridge main pier cap construction structure.

[0005] The present application provides a bridge main pier cap construction structure adopting the following technical solution: A bridge main pier cap construction structure includes a main pier column and a supporting cap, wherein the main pier column includes a plurality of unit prefabricated blocks, and the plurality of unit prefabricated blocks are arranged vertically, and the main pier column also includes a cast-in-place body, which is formed by casting concrete in situ, and the cast-in-place body is fixedly connected to the plurality of unit prefabricated blocks.

[0006] Preferably, two adjacent unit prefabricated blocks abut against each other, a longitudinal through hole is opened on the unit prefabricated block, the longitudinal through holes on the multiple unit prefabricated blocks arranged vertically are coaxial, the cast-in-place body includes a longitudinal steel-concrete column, the longitudinal steel-concrete column includes a columnar steel cage, and the columnar steel cage coaxially passes through the longitudinal through hole.

[0007] Preferably, a guide channel steel is pre-embedded and fixedly connected on the wall of the longitudinal through hole on the unit prefabricated block, and the length direction of the guide channel steel is consistent with the length direction of the longitudinal through hole. A matching slider is fixedly connected to the columnar steel cage, and the matching slider is located in the guide channel steel and the two are in contact with each other.

[0008] Preferably, the cast-in-place body also includes a transverse cast-in-place body, which is located between two adjacent unit prefabricated blocks. The transverse cast-in-place body includes an expansion steel bar frame, which includes a central axis steel ring and a plurality of radial rods. The central axis steel ring is coaxial with the longitudinal through hole, and the length direction of the radial rod is the radial direction of the central axis steel ring. One end of the radial rod is fixedly connected to the outer side of the central axis steel ring.

[0009] Preferably, the cross-section of the radial rod body is circular, and adjacent unit prefabricated blocks are provided with butt joint grooves, and groove surfaces of the butt joint grooves are in contact with side walls of the radial rod body.

[0010] Preferably, the radial rod body includes a fixed tube and a reinforcing core rod, the reinforcing core rod and the fixed tube are coaxially detachably connected, the inner space of the fixed tube and the central axis steel ring is connected, an overflow hole is provided on the tube wall of the fixed tube, and a diffusion branch groove is provided on the unit prefabricated block, and the diffusion branch groove, the docking groove and the overflow hole are connected.

[0011] Preferably, the cast-in-place body also includes a retaining steel concrete ring, and the edges of adjacent unit prefabricated blocks that are in contact with each other are provided with accommodating notch grooves, the retaining steel concrete ring is located in the accommodating notch grooves, the accommodating notch grooves are connected to the docking grooves, and the retaining steel concrete ring includes a plurality of steel mesh plates, which are located in the accommodating notch grooves and welded to the fixing pipes.

[0012] Preferably, the retaining steel concrete ring is cast by building a concrete formwork on the unit prefabricated block, the concrete formwork is provided with grouting holes, the grouting holes are connected to the receiving notch groove, and the pipe wall of the fixed pipe is provided with drainage holes, the drainage holes are connected to the receiving notch groove.

[0013] Preferably, a pressure block is provided on the inner side wall of the central axis steel ring, and a connecting spring is connected between the pressure block and the central axis steel ring. In a natural state, the pressure block and the central axis steel ring abut against and block the port of the fixed tube.

[0014] Preferably, a flow control pipe head is rotatably provided on the concrete formwork, the flow control pipe head is sleeved on the end of the fixed pipe, a control hole is opened on the flow control pipe head, and the control hole is selectively connected with the drainage hole.

[0015] The present application includes at least one of the following beneficial technical effects: 1. Through the setting of unit prefabricated blocks and cast-in-place bodies, the unit prefabricated blocks are prefabricated components with high assembly efficiency, and the volume proportion of cast-in-place bodies is low, which has little impact on construction efficiency, so the construction efficiency of the main piers can be improved; 2. Through the setting of the fixed pipe and the drainage hole, the longitudinal through hole in the middle of the main pier is connected through the inner cavity of the fixed pipe and the external accommodating notch groove, and the internal cast-in-place concrete structure and the external cast-in-place concrete structure are connected, thereby improving the overall structural stability of the main pier. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure used to reflect the construction structure of the main pier cap of the bridge in the embodiment of the present application.

[0017] Figure 2It is a schematic diagram of the cross-sectional structure used to illustrate the longitudinal through hole in the embodiment of the present application.

[0018] Figure 3 It is a structural schematic diagram used to reflect the unit prefabricated blocks and the expanded steel reinforcement frame in the embodiment of the present application.

[0019] Figure 4 It is a schematic cross-sectional view of the structure used to illustrate the concrete formwork closing the accommodating notch groove in the embodiment of the present application.

[0020] Figure 5 yes Figure 1 A partial enlarged view of part A in the middle.

[0021] Explanation of the reference numerals in the accompanying drawings: 1. Supporting abutment; 2. Main pier; 21. Unit prefabricated block; 211. Longitudinal through hole; 212. Accommodating notch groove; 213. Docking groove; 214. Diffusion branch groove; 22. Guide channel steel; 3. Cast-in-place body; 31. Columnar steel cage; 311. Matching slider; 32. Expansion steel frame; 321. Central axis steel ring; 322. Radial rod body; 3221. Fixed pipe; 3222. Overflow hole; 3223. Drainage hole; 3224. Strengthening core rod; 323. Pressure block; 324. Connecting spring; 33. Steel mesh; 4. Concrete formwork; 41. Grouting hole; 42. Flow control pipe head; 421. Control hole. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-5 This application is described in further detail.

[0023] The present application embodiment discloses a bridge main pier cap construction structure, such as Figure 1 and 2 As shown, it includes two main piers 2 and a supporting platform 1, and a single main pier 2 includes three unit prefabricated blocks 21 arranged vertically in sequence. The main pier 2 also includes a cast-in-place body 3. After the unit prefabricated blocks 21 are built, the cast-in-place body 3 is cast in situ by concrete, so as to be fixedly connected to the unit prefabricated blocks 21.

[0024] like Figure 1 and 2As shown, two adjacent unit prefabricated blocks 21 are abutted against each other, and a longitudinal through hole 211 is provided on the unit prefabricated block 21. The longitudinal through holes 211 on the three vertically arranged unit prefabricated blocks 21 are coaxially connected. The cast-in-place body 3 includes a longitudinal steel-concrete column, which is formed in the longitudinal through hole 211 by cast-in-place concrete; the longitudinal steel-concrete column includes a columnar steel cage 31, and the columnar steel cage 31 coaxially passes through the longitudinal through hole 211. A guide channel steel 22 is pre-embedded and fixedly connected on the unit prefabricated block 21 and on the hole wall of the longitudinal through hole 211. The length direction of the guide channel steel 22 is consistent with the length direction of the longitudinal through hole 211. A matching slider 311 is fixedly connected to the columnar steel cage 31. In the process of placing the columnar steel cage 31 in the longitudinal through hole 211, the matching slider 311 is located in the guide channel steel 22 and the two are in contact with each other. The matching of the two is used to improve the coaxiality of the columnar steel cage 31 and the longitudinal through hole 211.

[0025] like Figure 1 and 3 As shown, the cast-in-place body 3 also includes two cross-cast-in-place bodies, a single cross-cast-in-place body is located between two adjacent unit prefabricated blocks 21, and the cross-cast-in-place body includes an expansion steel bar frame 32, and the expansion steel bar frame 32 includes a central axis steel ring 321 and a plurality of radial rods 322, the central axis steel ring 321 is located in the longitudinal through hole 211 and is coaxial with the longitudinal through hole 211, and the outer wall of the central axis steel ring 321 abuts against the hole wall of the longitudinal through hole 211; one end of each radial rod 322 is fixedly connected to the outside of the central axis steel ring 321, and the length direction of the radial rod 322 is the radial direction of the central axis steel ring 321. During the construction process, after each unit prefabricated block 21 is placed, the expansion steel bar frame 32 is placed on it, and after the placement is completed, the upper unit prefabricated block 21 continues to be placed. In order to improve the placement smoothness of the upper unit prefabricated block 21, the cross section of the radial rod body 322 is circular, and the adjacent unit prefabricated blocks 21 are provided with a docking groove 213, and the groove surface of the docking groove 213 contacts the side wall of the radial rod body 322, so the cross section of the docking groove 213 is semicircular, and the inner and outer walls of the central axis steel ring 321 and the hole wall part where the longitudinal through hole 211 and the central axis steel ring 321 abut are all incomplete spherical surfaces. When the upper unit prefabricated block 21 is suspended, the cooperation of the docking groove 213 and the radial rod body 322 finally allows the adjacent two unit prefabricated blocks 21 to be corrected and positioned.

[0026] like Figure 1 and 3As shown, the radial rod body 322 includes a fixed tube 3221 and a reinforcing core rod 3224. The inner space of the fixed tube 3221 and the central axis steel ring 321 is connected. The reinforcing core rod 3224 and the fixed tube 3221 are coaxially threaded. When the unit prefabricated block 21 is suspended, the reinforcing core rod 3224 is located in the fixed tube 3221, which has a reinforcing support function for the structure of the fixed tube 3221, and reduces the impact damage of the upper unit prefabricated block 21 on the fixed tube 3221. After the unit prefabricated block 21 is placed, the reinforcing core rod 3224 can be pulled out of the fixed tube 3221, and the inner cavity of the fixed tube 3221 can be used for concrete slurry to flow. An overflow hole 3222 is provided on the tube wall of the fixed tube 3221, and a diffusion branch groove 214 is provided on the unit prefabricated block 21. The diffusion branch groove 214, the docking groove 213 and the overflow hole 3222 are connected, that is, the concrete slurry in the fixed tube 3221 can flow out through the overflow hole 3222 and spread to the remaining parts between the two unit prefabricated blocks 21 through the diffusion branch groove 214.

[0027] like Figure 3 and 4 As shown, the edges of the two adjacent unit prefabricated blocks 21 that are in contact with each other are provided with a receiving notch groove 212, the receiving notch groove 212 is connected to the docking groove 213, and the receiving notch grooves 212 of the two adjacent unit prefabricated blocks 21 are connected to each other; the cast-in-place body 3 also includes a retaining steel mixed ring, which is located in the receiving notch groove 212, and the steel bar structure inside it is formed by a plurality of steel mesh plates 33 tied together and connected, and the steel mesh plates 33 are located in the receiving notch groove 212 and are welded and fixed to the fixed pipe 3221. The retaining steel mixed ring is cast by building a concrete template 4 on the unit prefabricated block 21, and the concrete template 4 is provided with a grouting hole 41, and the grouting hole 41 is connected to the receiving notch groove 212, and the retaining steel mixed ring can be formed by pouring concrete into the receiving notch groove 212 through the grouting hole 41. A drainage hole 3223 is provided on the pipe wall of the fixed pipe 3221, and the drainage hole 3223 is connected to the receiving notch groove 212. A flow control pipe head 42 is rotatably provided on the concrete formwork 4. After the concrete formwork 4 is built, it abuts against the side wall of the unit prefabricated block 21, and the receiving notch groove 212 is closed. The flow control pipe head 42 is sleeved on the end of the fixed pipe 3221, and the rotation of the flow control pipe head 42 can be controlled from the outside. A control hole 421 is provided on the flow control pipe head 42. As the flow control pipe head 42 rotates, the control hole 421 and the drainage hole 3223 are selectively connected. When the two are connected, the concrete slurry in the receiving notch groove 212 can cross the control hole 421 and the drainage hole 3223 and enter the fixed pipe 3221, and then can also enter the diffusion branch groove 214 through the overflow hole 3222.

[0028] like Figure 1 , 3As shown in Figure 5, a pressure block 323 is provided on the inner wall of the central axis steel ring 321, and a connecting spring 324 is connected between the pressure block 323 and the central axis steel ring 321. The pressure block 323 is spherical, and its working principle is similar to that of a one-way valve. In a natural state, the pressure block 323 and the central axis steel ring 321 abut against and block the port of the fixed pipe 3221. When the grouting pressure in the fixed pipe 3221 increases to be greater than the pulling force of the connecting spring 324, the pressure block 323 is moved by the thrust, and the port of the fixed pipe 3221 is connected to the longitudinal through hole 211, and the concrete mud from the grouting hole 41 can enter the longitudinal through hole 211.

[0029] The implementation principle of a bridge main pier cap construction structure in the embodiment of the present application is: First, build each unit prefabricated block 21 and each expansion steel bar frame 32, then pull out the reinforcing core rod 3224, build and fix the steel mesh plate 33 and the lower columnar steel cage 31, then build and fix the concrete formwork 4 around the unit prefabricated block 21, rotate the flow control pipe head 42 to the position where the control hole 421 and the drainage hole 3223 are connected to each other, and inject concrete slurry into the receiving notch groove 212 through the grouting hole 41; when the concrete slurry in the fixed pipe 3221 enters the longitudinal through hole 211, stop grouting, and the pressure block 323 returns to block the fixed pipe 3221, and maintain pressure and curing until the surrounding steel-concrete ring and the cross-cast-in-place body are formed. Then, concrete is poured into the longitudinal through hole 211 to form the longitudinal steel-concrete column.

[0030] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bridge main pier cap construction structure, comprising a main pier column (2) and a supporting cap (1), characterized in that: The main pier column (2) comprises a plurality of unit prefabricated blocks (21), wherein the plurality of unit prefabricated blocks (21) are arranged vertically. The main pier column (2) further comprises a cast-in-place body (3), wherein the cast-in-place body (3) is formed by casting concrete in situ, and the cast-in-place body (3) and the plurality of unit prefabricated blocks (21) are fixedly connected.

2. A bridge main pier cap construction structure according to claim 1, characterized in that: Two adjacent unit prefabricated blocks (21) are in contact with each other, a longitudinal through hole (211) is provided on the unit prefabricated block (21), the longitudinal through holes (211) on a plurality of unit prefabricated blocks (21) arranged vertically are coaxial, the cast-in-place body (3) comprises a longitudinally penetrating steel-concrete column, the longitudinally penetrating steel-concrete column comprises a columnar steel cage (31), and the columnar steel cage (31) passes through the longitudinal through hole (211) coaxially.

3. A bridge main pier cap construction structure according to claim 2, characterized in that: A guide channel steel (22) is pre-embedded and fixedly connected on the wall of the longitudinal through hole (211) on the unit prefabricated block (21), the length direction of the guide channel steel (22) is consistent with the length direction of the longitudinal through hole (211), and a matching slider (311) is fixedly connected on the columnar steel cage (31), the matching slider (311) is located in the guide channel steel (22), and the two are in contact with each other.

4. A bridge main pier cap construction structure according to claim 2 or 3, characterized in that: The cast-in-place body (3) further comprises a transverse cast-in-place body, wherein the transverse cast-in-place body is located between two adjacent unit prefabricated blocks (21), and the transverse cast-in-place body comprises an expansion steel bar frame (32), wherein the expansion steel bar frame (32) comprises a central axis steel ring (321) and a plurality of radial rods (322), wherein the central axis steel ring (321) and the longitudinal through hole (211) are coaxial, wherein the length direction of the radial rods (322) is the radial direction of the central axis steel ring (321), and one end of the radial rods (322) is fixedly connected to the outer side of the central axis steel ring (321).

5. A bridge main pier cap construction structure according to claim 4, characterized in that: The cross section of the radial rod body (322) is circular, and adjacent unit prefabricated blocks (21) are provided with butt joint grooves (213), and the groove surface of the butt joint groove (213) contacts the side wall of the radial rod body (322).

6. The bridge main pier cap construction structure according to claim 5, characterized in that: The radial rod body (322) comprises a fixed tube (3221) and a reinforcing core rod (3224); the reinforcing core rod (3224) and the fixed tube (3221) are coaxially detachably connected; the inner space of the fixed tube (3221) and the central axis steel ring (321) are in communication; a grout overflow hole (3222) is provided on the tube wall of the fixed tube (3221); a diffusion branch groove (214) is provided on the unit prefabricated block (21); and the diffusion branch groove (214), the docking groove (213) and the grout overflow hole (3222) are in communication.

7. The bridge main pier cap construction structure according to claim 6, characterized in that: The cast-in-place body (3) further comprises a retaining steel concrete ring, and edges of adjacent unit prefabricated blocks (21) in contact with each other are provided with receiving notch grooves (212), the retaining steel concrete ring is located in the receiving notch grooves (212), the receiving notch grooves (212) and the docking grooves (213) are connected, and the retaining steel concrete ring comprises a plurality of steel mesh plates (33), the steel mesh plates (33) are located in the receiving notch grooves (212) and are welded to the fixing pipes (3221).

8. The bridge main pier cap construction structure according to claim 7, characterized in that: The enclosure steel concrete ring is cast by building a concrete formwork (4) on the unit prefabricated block (21); a grouting hole (41) is provided on the concrete formwork (4); the grouting hole (41) is connected to the receiving notch groove (212); a drainage hole (3223) is provided on the pipe wall of the fixed pipe (3221); the drainage hole (3223) is connected to the receiving notch groove (212).

9. A bridge main pier cap construction structure according to claim 8, characterized in that: A pressure block (323) is provided on the inner side wall of the central axis steel ring (321), and a connecting spring (324) is connected between the pressure block (323) and the central axis steel ring (321). In a natural state, the pressure block (323) and the central axis steel ring (321) abut against and block the port of the fixed tube (3221).

10. The bridge main pier cap construction structure according to claim 9, characterized in that: A flow control pipe head (42) is rotatably provided on the concrete formwork (4), the flow control pipe head (42) is sleeved on the end of the fixed pipe (3221), a control hole (421) is provided on the flow control pipe head (42), and the control hole (421) and the drainage hole (3223) are selectively connected.

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