Structure and construction method for connecting steel tube concrete bridge pier and steel box girder by convex steel diaphragm

Abstract

The present application belongs to the technical field of bridge structure, and particularly relates to a structure for connecting a steel pipe concrete pier and a steel box girder by using convex steel diaphragms and a construction method thereof. The present application provides a structure for connecting a steel pipe concrete pier and a steel box girder by using convex steel diaphragms, which can realize at least three connecting relationships of insertion, concrete pouring connection and convex diaphragm unit reinforced concrete pouring connection between the steel pipe concrete pier and the steel box girder by setting pre-poured concrete columns, box girder bottom plates, diaphragms, box girder top plates, mounting holes, insertion slots, convex diaphragm units and cast-in-place concrete blocks on the pier steel pipe, so that the overall structure has greater structural stability and can be used stably for a long time.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bridge structure, and particularly relates to a structure for connecting a steel pipe concrete pier and a steel box girder by using a convex steel diaphragm and a construction method thereof. BACKGROUND

[0002] The steel pipe concrete pier has a specific structural composition of an outer steel pipe and inner concrete. Therefore, the pier has the advantages of tensile resistance of the steel structure and compressive resistance of the concrete structure.

[0003] The steel box girder has a structure similar to a box and a general cuboid shape. The stable connection between the pier and the steel box girder is one of the necessary conditions for the long-term stability of the overall bridge structure.

[0004] Generally, the connection methods mainly include screwing, welding, and concrete pouring.

[0005] For example, the Chinese utility model patent with the authorization announcement number CN216474576U and the authorization announcement date of May 10, 2022 discloses a solidification structure of a swivel rigid frame bridge steel box girder and a concrete pier, which comprises a turntable, a concrete pier, and a solidification device. The surface of the concrete pier is rotationally connected with the surface of the turntable, and the surface of the concrete pier is provided with a bridge. The solidification device is arranged at the connection between the concrete pier and the bridge. The solidification device comprises a limiting frame, the surface of the limiting frame is fixedly connected with the surface of the concrete pier, the surface of the limiting frame is fixedly connected with a resisting plate, the surface of the resisting plate is provided with a insertion hole, the inner wall of the insertion hole is threadedly connected with a fixed bolt column, the surface of the concrete pier is sleeved with a supporting ring, the inner wall of the supporting ring is fixedly connected with a connecting bolt column, the surface of the supporting ring is provided with a constraint groove, and the inner wall of the constraint groove is rotationally connected with a load frame.

[0006] The solidification structure of the utility model patent has the advantages of increasing the stability of the bridge body, reducing the solidification difficulty of the bridge body, improving the assembly efficiency of the bridge body, and improving the firmness of the bridge body by arranging the solidification device.

[0007] However, the solidification structure has at least the following deficiency in actual use, which is also the technical problem to be solved by the present application, namely:

[0008] The direct connection part between the solidification device and the bridge is only a plurality of fixed bolt columns, so the transverse fixing strength is not enough, the stability of the entire connection structure is insufficient, and the structure is difficult to be used for a long time.

[0009] Therefore, as described above, there is an urgent need for an overall stable structure for high-strength connection of a pier and a bridge, so that the bridge has vertical and horizontal installation stability on the pier. SUMMARY

[0010] The present application provides a structure for connecting a steel pipe concrete bridge pier and a steel box girder by using a convex steel diaphragm, which can realize at least three connecting relationships, i.e., insertion, concrete pouring connection and convex diaphragm unit reinforced concrete pouring connection, by setting a pre-poured concrete column, a box girder bottom plate, a diaphragm, a box girder top plate, a mounting hole, an insertion slot, a convex diaphragm unit and a cast-in-place concrete block on the bridge pier steel pipe, so that the overall structure has greater structural stability and can be used stably for a long time.

[0011] In addition, the present application also provides a construction method for the above structure, which includes the following steps: pre-pouring the concrete column in a factory, then fixing a threaded steel in the bridge pier steel pipe, and finally appropriately shortening the construction period of the overall structure.

[0012] The present application solves the above problems by using a structure for connecting a steel pipe concrete bridge pier and a steel box girder by using a convex steel diaphragm, which includes a bridge pier steel pipe, a pre-poured concrete column, a box girder bottom plate, a diaphragm, a box girder top plate, a mounting hole arranged on the box girder bottom plate and inserted into the bridge pier steel pipe, an insertion slot opened downward from the upper end surface of the bridge pier steel pipe, a convex diaphragm unit arranged on the upper surface of the box girder bottom plate and engaged with the insertion slot, and a cast-in-place concrete block arranged in the bridge pier steel pipe and the box girder bottom plate and covering the convex diaphragm unit.

[0013] Further preferred technical solutions are that the number of the insertion slots is two, the convex diaphragm unit includes an end head convex plate arranged on the upper surface of the box girder bottom plate and engaged with the two insertion slots, and an end head slotting plate arranged on the end head convex plate and used for slotting the end head of the cast-in-place concrete.

[0014] Further preferred technical solutions are that the convex diaphragm unit further includes a vertical plate arranged on the end head convex plate and used for engaging the side of the insertion slot.

[0015] Further preferred technical solutions are that the pre-poured concrete column is provided with a threaded steel for inserting the cast-in-place concrete block, the convex diaphragm unit further includes a middle hole arranged on the end head convex plate and used for penetrating the threaded steel, and the threaded steel is further provided with a fastening nut for pressing down the end head convex plate.

[0016] Further preferred technical solutions are that the convex diaphragm unit further includes an extension pipe arranged on the lower surface of the end head convex plate and sleeved with the threaded steel.

[0017] Further preferably, the plug-in groove is further provided with a stiffener plate unit for welding the outer ring surface of the pier steel pipe and the lower surface of the box girder bottom plate.

[0018] Further preferably, the stiffener plate unit comprises a rectangular transverse plate plugged on the plug-in groove and supporting the box girder bottom plate, and a right-angled triangle plate provided on the rectangular transverse plate and used for welding the outer ring surface of the pier steel pipe and the lower surface of the box girder bottom plate.

[0019] Further preferably, the convex transverse diaphragm unit further comprises a reinforcing insertion slot opened upward from the lower end surface of the extension pipe and used for clamping the rectangular transverse plate.

[0020] Further preferably, the inner ring surface of the pier steel pipe is further provided with a radial plate used for connecting the threaded steel.

[0021] The construction method of the structure of the pier steel pipe concrete bridge pier and the steel box girder connected by the convex steel transverse diaphragm comprises the following steps: the precast concrete column is preformed in a factory, and then the threaded steel is fixed in the pier steel pipe. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a position structure schematic diagram of the present application.

[0023] Figure 2 It is a position schematic diagram of the mounting hole in the present application.

[0024] Figure 3 It is a position schematic diagram of the plug-in groove in the present application.

[0025] Figure 4 It is a position schematic diagram of the threaded steel in the present application.

[0026] Figure 5 It is a position schematic diagram of the convex transverse diaphragm unit in the present application.

[0027] Figure 6 It is a structure schematic diagram of the convex transverse diaphragm unit in the present application.

[0028] Figure 7 It is a position shape schematic diagram of the radial plate in the present application.

[0029] Figure 8 It is a position structure schematic diagram of the stiffener plate unit in the present application.

[0030] Figure 9 It is a position schematic diagram of the fastening nut in the present application from the perspective of the top view.

[0031] Figure 10 It is a structure schematic diagram of the pier steel pipe concrete bridge pier in the present application.

[0032] In the figure, the meaning of each mark is as follows:

[0033] Pier steel pipe 11, pre-poured concrete column 12, box girder bottom plate 13, partition plate 14, box girder top plate 15;

[0034] Mounting hole 1, insertion slot 2, protruding transverse partition plate unit 3, cast-in-place concrete block 4, threaded steel 5, fastening nut 6, stiffening plate unit 7, radial plate 8;

[0035] End protruding transverse plate 301, end slotted 302, vertical plate 303, middle opening 304, extension pipe 305, reinforcing insertion slot 306, rectangular transverse plate 701, right-angled triangular plate 702. DETAILED DESCRIPTION

[0036] The following description is only a preferred embodiment of the present application, and does not limit the scope of the present application.

[0037] As shown in the accompanying drawings, Figures 1-10 A structure for connecting a concrete-filled steel tube pier and a steel box girder by a convex steel transverse partition plate, comprising a pier steel pipe 11, a pre-poured concrete column 12, a box girder bottom plate 13, a partition plate 14, and a box girder top plate 15, further comprising a mounting hole 1 provided on the box girder bottom plate 13 and inserted into the pier steel pipe 11, an insertion slot 2 formed downward from the upper surface of the pier steel pipe 11, a protruding transverse partition plate unit 3 provided on the upper surface of the box girder bottom plate 13 and engaged with the insertion slot 2, and a cast-in-place concrete block 4 provided in the pier steel pipe 11 and the box girder bottom plate 13 and covering the protruding transverse partition plate unit 3.

[0038] In this embodiment, the main structure of the concrete-filled steel tube pier includes a pier steel pipe 11 and a pre-poured concrete column 12, and the main structure of the steel box girder includes a box girder bottom plate 13, a partition plate 14, and a box girder top plate 15. The connection structure of the above two structures mainly includes the protruding transverse partition plate unit 3 and the cast-in-place concrete block 4.

[0039] So far, the concrete-filled steel tube pier, the steel box girder, and the connection structure form a relatively complete structure. The high-strength connection and stable installation features of this structure are mainly reflected in the following three aspects:

[0040] First, the pier steel pipe 11 is inserted upward at the mounting hole 1;

[0041] Second, the cast-in-place concrete block 4 connects the concrete-filled steel tube pier and the steel box girder as a whole;

[0042] Thirdly, the convex diaphragm plate unit 3 further increases the insertion size and effective insertion degree of the steel pipe concrete pier and the cast-in-place concrete block 4, so that the above-mentioned concrete connection strength is further improved.

[0043] The shape of the mounting hole 1 is circular. The symmetric line of the insertion slot 2 passes through the central axis of the pier steel pipe 11 in the top view.

[0044] In addition, the convex diaphragm plate unit 3 is at least abutted against the upper surface of the box girder bottom plate 13, and can be further welded and fixed. The contour shape of the cast-in-place concrete block 4 is "upper cuboid and lower cylinder", which covers the entire convex diaphragm plate unit 3 and the upper end portion of the pier steel pipe 11, thereby realizing the effect of concrete pouring to connect the pier and the steel box girder.

[0045] Finally, the starting point of the concrete pouring of the cast-in-place concrete block 4 is the upper end surface of the pre-poured concrete column 12 and the upper surface of the box girder bottom plate 13, the lateral pouring boundary is the diaphragm 14, and the ending point of the pouring is the lower surface of the box girder top plate 15. The box girder top plate 15 can be welded and fixed after the cast-in-place concrete block 4 is solidified and formed, or it can be welded and fixed with the diaphragm 14 when it leaves the factory, but a concrete pouring opening is reserved thereon.

[0046] The number of the insertion slot 2 is 2; the convex diaphragm plate unit 3 includes an end convex plate 301 arranged on the upper surface of the box girder bottom plate 13 and engaged with the two insertion slots 2, and an end slotting 302 arranged on the end convex plate 301 and used for end slotting of the cast-in-place concrete in the pier steel pipe 11.

[0047] In the embodiment, the shape of the end convex plate 301 is rectangular, and the symmetric axis parallel to the long side thereof passes through the vertical central axis of the pier steel pipe 11, so that the end convex plate 301 can uniformly and symmetrically resist tension and reinforce the pier steel pipe 11 in the cast-in-place concrete block 4.

[0048] The width of the end convex plate 301 is equal to the width of the insertion slot 2. The shape of the end slotting 302 is rectangular, and the number thereof is 2. The transverse slotting depth is at least sufficient to expose the inner area of the pier steel pipe 11, otherwise the cast-in-place concrete block 4 cannot fill the pier steel pipe 11, and there is no "lower cylinder" shaped cast-in-place concrete part, which greatly reduces the structural strength of the structure.

[0049] Of course, the transverse slotting depth of the end slotting 302 cannot be too large, otherwise the structural strength of the convex diaphragm plate unit 3 will be reduced, which is not conducive to the stability of the structure.

[0050] At this time, the shape of the protruding diaphragm plate unit 3 is "H-shaped".

[0051] The protruding diaphragm plate unit 3 further comprises a vertical plate 303 arranged on the end protruding horizontal plate 301 and used for clamping the side of the plug-in slot 2.

[0052] In the embodiment, the two vertical plates 303 and the end protruding horizontal plate 301 are integrally formed, and the vertical sectional shape of the whole is "U-shaped". Compared with the mode of using the end protruding horizontal plate 301 alone, the advantages of this combination mode are that the clamping strength of the plug-in slot 2 and the insertion strength of the cast-in-place concrete block 4 can be significantly improved.

[0053] The pre-cast concrete column 12 is provided with a threaded steel 5 for inserting the cast-in-place concrete block 4; the protruding diaphragm plate unit 3 further comprises a middle opening 304 arranged on the end protruding horizontal plate 301 and used for passing through the threaded steel 5; and the threaded steel 5 is further provided with a fastening nut 6 for pressing down the end protruding horizontal plate 301.

[0054] In the embodiment, for the pre-cast concrete column 12, the threaded steel 5 serves to sufficiently reinforce the pre-cast concrete, thereby finally improving the structural strength of the whole steel pipe concrete pier.

[0055] On the other hand, the pre-cast concrete column 12 can also be reinforced in the form of a steel mesh cage in the manner of the prior art, and the structure of the steel pipe concrete pier can also be strengthened, as long as the position of the steel mesh cage does not affect the installation of the protruding diaphragm plate unit 3.

[0056] In addition, for the protruding diaphragm plate unit 3, the threaded steel 5 serves to:

[0057] First, it is inserted into the middle opening 304, thereby transversely reinforcing the whole protruding diaphragm plate unit 3;

[0058] Second, after cooperating with the fastening nut 6, it presses down the end protruding horizontal plate 301, thereby vertically reinforcing the whole protruding diaphragm plate unit 3.

[0059] Finally, it should be noted that:

[0060] When the protruding diaphragm plate unit 3 is installed, the threaded steel 5 has been completely fixed on the pre-cast concrete column 12;

[0061] The upper end of the threaded steel 5 can protrude outside the pier steel pipe 11, but cannot affect the installation of the box girder top plate 15.

[0062] The convex transverse partition plate unit 3 further comprises an extension pipe 305 arranged on the lower surface of the end convex transverse plate 301 and sleeving the threaded steel 5.

[0063] In the embodiment, no thread is arranged on the middle opening 304 and the extension pipe 305, and the direct function of the extension pipe 305 is to sleeve the threaded steel 5 together with the middle opening 304, increase the sleeving size between the convex transverse partition plate unit 3 and the threaded steel 5, and make the above-mentioned transverse reinforcing effect better.

[0064] The insertion slot 2 is further provided with a stiffening plate unit 7 for welding the outer ring surface of the pier steel pipe 11 and the lower surface of the box girder bottom plate 13.

[0065] In the embodiment, the main function of the stiffening plate unit 7 is to reinforce and connect the steel pipe concrete pier and the steel box girder together with the convex transverse partition plate unit 3 and the cast-in-place concrete block 4, that is, the stiffening plate unit 7 also belongs to the above-mentioned connecting structure.

[0066] The number of the stiffening plate unit 7 is 2-4, and the stiffening plate unit 7 is arranged uniformly in the ring direction of the pier steel pipe 11.

[0067] The stiffening plate unit 7 comprises a rectangular transverse plate 701 arranged in the insertion slot 2 and supporting the box girder bottom plate 13, and a right-angled triangle plate 702 arranged on the rectangular transverse plate 701 and used for welding the outer ring surface of the pier steel pipe 11 and the lower surface of the box girder bottom plate 13.

[0068] In the embodiment, another use method of the insertion slot 2 is that the rectangular transverse plate 701 is pressed on the bottom surface of the insertion slot 2, the box girder bottom plate 13 is pressed on the rectangular transverse plate 701, and the end convex transverse plate 301 is pressed on the box girder bottom plate 13.

[0069] At least the following advantages are obtained by the above-mentioned combined structure.

[0070] Firstly, the opening depth of the insertion slot 2 exceeds the box girder bottom plate 13 downward, but is blocked by the rectangular transverse plate 701, so that the insertion slot 2 does not leak concrete.

[0071] Secondly, for the stiffening plate unit 7, not only can the outer ring surface of the pier steel pipe 11 and the lower surface of the box girder bottom plate 13 be welded, but also the cast-in-place concrete block 4 can be inserted, so as to reinforce and install the stiffening plate unit 7 and improve the structural strength of the whole structure.

[0072] In addition, the two right-angle edges of the right-angled triangle plate 702 are welded with the outer ring surface of the pier steel pipe 11 and the lower surface of the box girder bottom plate 13 respectively.

[0073] The convex transverse partition unit 3 further comprises a reinforcing slot 306 which is opened upward from the lower end face of the extension pipe 305 and used for clamping the rectangular transverse plate 701.

[0074] In the embodiment, the stiffening plate unit 7 has the above-mentioned three fixing and mounting modes:

[0075] First, the rectangular transverse plate 701 is inserted into the cast-in-situ concrete block 4, and the latter is connected as a whole after solidification;

[0076] Second, the rectangular transverse plate 701 is inserted into the insertion slot 2.

[0077] Third, the right-angled triangular plate 702 is welded to the pier steel pipe 11 and the box girder bottom plate 13.

[0078] At this point, the stiffening plate unit 7 can realize its stable installation and reinforcement of the connection position of the steel pipe concrete pier and the steel box girder.

[0079] The setting of the reinforcing slot 306 directly clamps the rectangular transverse plate 701, and finally achieves:

[0080] First, the circumferential fixing of the convex transverse partition unit 3 makes the length direction of the convex transverse partition unit 3 can be set as needed, for example, the reinforcing effect is best when the length direction is the transverse bridge direction, then the connecting direction of the two stiffening plate units 7 can be set as the transverse bridge direction.

[0081] Second, as the fourth fixing and mounting mode of the stiffening plate unit 7, it further improves the stability of the fixing and mounting.

[0082] Of course, the appropriate transverse insertion of the rectangular transverse plate 701 on the reinforcing slot 306 will not block the threaded steel 5.

[0083] The radial plate 8 for connecting the threaded steel 5 is further arranged on the inner circumferential surface of the pier steel pipe 11.

[0084] In the embodiment, the pre-poured concrete column 12 is welded with the pier steel pipe 11, the radial plate 8, and the threaded steel 5 before pouring, so that the "steel pipe" part of the steel pipe concrete pier has a larger structural strength.

[0085] Moreover, the radial plate 8 can also avoid harmful transverse displacement of the threaded steel 5 when pouring concrete, and ensure that the fixed position of the threaded steel 5 is the center axis position of the pier steel pipe 11.

[0086] The construction method of the structure of the connection between the steel tube concrete bridge pier and the steel box girder reinforced by the convex steel diaphragm plate comprises the following steps: the precast concrete column 12 is preformed in a factory, and then the threaded steel 5 is fixed in the bridge pier steel tube 11.

[0087] In the embodiment, the upper end surface height of the precast concrete column 12 is lower than the bottom surface height of the insertion slot 2, so that the convex diaphragm plate unit 3 is entirely poured and fixed in the cast-in-place concrete block 4.

[0088] The above factory precasting step can not only fix the threaded steel 5 and the bridge pier steel tube 11, but also greatly shorten the overall construction period of the structure.

[0089] The embodiments of the application are described in detail above in combination with the drawings, but the application is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art in the technical field without departing from the purpose of the application. These are not creative modifications, and are protected by the patent law within the scope of the claims of the application.

Claims

1. A structure for connecting a steel-concrete composite pier and a steel box girder using convex steel diaphragms, comprising a pier steel pipe (11), a precast concrete column (12), a box girder bottom plate (13), a diaphragm (14), and a box girder top plate (15), characterized in that: It also includes an installation hole (1) set on the bottom plate (13) of the box girder and inserted into the steel pipe (11) of the pier, an insertion groove (2) opened from the upper end of the steel pipe (11) downward, a protruding transverse diaphragm unit (3) set on the upper surface of the bottom plate (13) of the box girder and engaged with the insertion groove (2), and a cast-in-place concrete block (4) set in the steel pipe (11) of the pier and on the bottom plate (13) of the box girder and covering the protruding transverse diaphragm unit (3). The number of the insertion slots (2) is 2; the protruding transverse diaphragm unit (3) includes an end protruding transverse plate (301) disposed on the upper surface of the bottom plate (13) of the box girder and engaged with the two insertion slots (2), and an end slot (302) disposed on the end protruding transverse plate (301) and used for casting concrete into the steel pipe (11) of the pier. The protruding transverse partition unit (3) also includes a vertical plate (303) disposed on the end protruding transverse plate (301) and used to engage the side of the insertion slot (2). The precast concrete column (12) is provided with a threaded steel bar (5) for inserting the cast-in-place concrete block (4); the protruding transverse diaphragm unit (3) also includes a central opening (304) provided on the end protruding transverse plate (301) and used to pass through the threaded steel bar (5); the threaded steel bar (5) is also provided with a fastening nut (6) for pressing down the end protruding transverse plate (301). The protruding transverse partition unit (3) also includes an extension tube (305) disposed on the lower surface of the end protruding transverse plate (301) and sleeved with the threaded steel (5). The insertion slot (2) is also provided with a stiffening plate unit (7) for welding the outer ring surface of the pier steel pipe (11) and the lower surface of the box girder bottom plate (13). The stiffening plate unit (7) includes a rectangular horizontal plate (701) that is inserted into the insertion slot (2) and supports the bottom plate (13) of the box girder, and a right-angled triangular plate (702) that is disposed on the rectangular horizontal plate (701) and used for welding the outer ring surface of the pier steel pipe (11) and the lower surface of the bottom plate (13) of the box girder. The protruding diaphragm unit (3) also includes a reinforcing slot (306) that is opened upward from the lower end of the extension tube (305) and is used to engage the rectangular diaphragm (701).

2. The structure for connecting the steel-concrete composite pier and the steel box girder using convex steel diaphragms as described in claim 1, characterized in that: The inner ring surface of the bridge pier steel pipe (11) is also provided with a radial plate (8) for connecting the threaded steel (5).

3. The construction method for the connection between the convex steel diaphragm reinforced steel tube concrete bridge pier and the steel box girder as described in claim 1, characterized in that: The precast concrete column (12) is precast in the factory and then the threaded steel (5) is fixed inside the pier steel pipe (11).

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