CN215629489U

CN215629489U - Connecting device for new and old beam plates for reconstruction and extension of highway

Info

Publication number: CN215629489U
Application number: CN202122086478.9U
Authority: CN
Inventors: 董丰源; 杜岩松; 范峰; 陈成勇
Original assignee: Shandong Jiaotong University
Current assignee: Shandong Jiaotong University
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-01-25
Anticipated expiration: 2031-08-31

Abstract

The utility model discloses a connecting device of new and old beam slabs, which is used for solving the problem of connecting the new and old beam slabs in the construction of reconstruction and expansion bridges and comprises the new and old beam slabs and a clamping plate assembly clamped at a gap between the new and old beam slabs, wherein the clamping plate assembly comprises an upper perforated steel plate, a lower perforated steel plate, prestressed steel bars and an anchoring head. Through steel sheet, stiffening rib and prestressed reinforcement, carry out mechanical connection with the upper and lower roof of new and old roof beam, this connecting device has fixed, biography power and load function, not only can guarantee integrality, the wholeness of old roof beam, the security during still having ensured the construction.

Description

Connecting device for new and old beam plates for reconstruction and extension of highway

Technical Field

The utility model relates to the field of reconstruction and extension construction of high-speed bridges, and designs a connecting device for helping new and old beam plates, which is applied to the problem of connection between the new beam plate and the old beam plate when a lane of a highway is widened.

Background

In recent years, the urban traffic volume of China is increased year by year, so that the load bearing degree of a bridge is increased continuously, the carrying capacity of the original expressway cannot meet the current transportation requirement, reconstruction and expansion become a great hot point of bridge construction, connection of new and old beam plates is a major technical key point, and the construction progress and the structural performance are influenced by the quality of the connection condition of the new and old beam plates.

In order to respond to national call of thrifty people and to determine whether old bridge plates can be recycled, a plurality of students in China carry out experimental research, and the results show that the old bridge plates mostly accord with 'road bridge bearing capacity detection and evaluation rules', so that for widening highways, the country adopts a method for combining a new beam and an old beam, but various research institutions and students have different opinions on the connection modes of the new and old bridge plates, and common mainstream connection modes comprise hinge joint connection, rigid connection, semi-rigid connection and up-and-down uneven connection.

The connection quality of the new and old beam plates seriously affects the structural performance of the beam plates.

For example, CN 212835030U discloses a new and old beam slab displacement prevention device for rebuilding and expanding T-shaped bridge, belonging to the technical field of building construction. The jacking structure comprises two symmetrically arranged jacking structures, wherein the jacking structures comprise two vertical plates which are arranged in parallel, upper horizontal plates are arranged at the upper ends of the adjacent surfaces of the two vertical plates, lower horizontal plates are arranged at the lower ends of the adjacent surfaces of the two vertical plates, the two upper horizontal plates are connected through a top connecting steel plate, and the two lower horizontal plates are connected through a bottom connecting steel plate; the top connecting steel plate and the bottom connecting steel plate are positioned at two end parts of the vertical plate; connecting pieces with threaded holes are arranged at the connecting part of the upper horizontal plate and the vertical plate and the connecting part of the lower horizontal plate and the vertical plate, and the connecting pieces are positioned at any end of the vertical plate; the connecting piece is provided with a screw rod through threaded connection. The utility model discloses a prevent that new and old roof beam slab of T type bridge from producing the displacement during connecting diaphragm stretch-draw, guarantee the connection quality.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem of connection of new and old beam plates in the reconstruction and expansion bridge construction, and provides a connecting device for the new and old beam plates.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a connecting device for reconstructing and expanding new and old beam slabs of a highway comprises the new and old beam slabs and a clamping plate assembly clamped at a gap between the new and old beam slabs, wherein the clamping plate assembly comprises an upper perforated steel plate, a lower perforated steel plate, prestressed reinforcements and anchoring heads,

two groups of through holes are formed in the upper perforated steel plate and the lower perforated steel plate respectively, each group of through holes is two, two pairs of prestressed steel bars are obliquely arranged in a crossed mode and are tensioned by prestress of anchoring heads on the upper perforated steel plate and the lower perforated steel plate, and the upper perforated steel plate and the lower perforated steel plate are clamped between a new beam plate and an old beam plate.

Ribbed plates are welded on the outer side surfaces of the upper perforated steel plate and the lower perforated steel plate, wherein the rib height of each stiffening ribbed plate is 2cm, the thickness of each stiffening ribbed plate is 0.8mm, and the length of each stiffening ribbed plate is 60 cm.

The prestressed reinforcement adopts phi 7 specification, the prestress is loaded at 1860MPa, and the two ends of the prestressed reinforcement are anchored by adopting anchoring heads.

And strong glue is smeared at the joint of the upper and lower perforated steel plates and the new and old beam plates.

Furthermore, the two ends of the upper and lower pore plates in the length direction are respectively provided with a local flanging.

The flanging part is provided with a concave-convex structure of wolf teeth.

The steel plate with the upper and lower holes is provided with a plurality of threaded holes at the combined part of the new and old beam plates, the threaded holes are distributed according to a certain rule, a jacking screw is arranged in each threaded hole, and the jacking screws are jacked on the new and old beam plates to expect to carry out micro-adjustment on the height difference between the new and old beam plates.

The utility model has the beneficial effects that:

the connecting device for the new and old beams and slabs mechanically connects the upper and lower top slabs of the new and old beams through the steel plates, the stiffening ribs and the prestressed steel bars, has the functions of fixing, force transferring and loading, can ensure the integrity and integrity of the old beams, and also ensures the safety during construction.

Different from the connection technology in the past, this utility model is convenient for the construction more, and can be better carry out the pre-fixing to the new and old beam slab of both sides to effectively prevent the position in the horizontal plane and slide, and possess better structural performance.

Drawings

Fig. 1 is a perspective view of an upper perforated steel plate.

Fig. 2 is a perspective view of a lower-bored steel plate.

Fig. 3 is a perspective view of the present device.

Fig. 4 is a use state diagram.

Fig. 5 is a state view after concrete is poured.

FIG. 6 is a perspective view of a steel plate according to a second embodiment.

FIG. 7 is a diagram of a second embodiment.

In the figure:

10 steel plates with holes, 10' steel plates with holes, 11 through holes, 12 rib plates, 13 turned-over edges,

20 of pre-stressed steel bars are pre-stressed,

30 of the reinforcing steel bar anchoring heads are arranged,

40 the screw is tightly pressed against the screw,

01 is a new beam slab, 02 is an old beam slab, and 03 is poured with concrete.

Detailed Description

In order to achieve the purpose, the utility model adopts the following technical measures:

a connecting device for new and old beam plates is used for connecting the new and old beam plates in road reconstruction and extension projects. Comprises new and old beam plates and a splint assembly clamped at the gap between the new and old beam plates, wherein the splint assembly is arranged in line according to unit modules along the splicing seams of the new and old beam plates, for example, one group of the components is used at intervals of 1 meter in the embodiment.

Example one

Referring to fig. 1 to 5, the cleat assembly includes an upper perforated steel plate 10, a lower perforated steel plate 10', a prestressed reinforcement 20, and a reinforcement anchor head 30. As a specific construction method, the upper open-hole steel plate 10 and the lower open-hole steel plate 10' are made of steel plates with the same size and specification, specifically, the steel plates are cut by the thickness of 2cm, the length of 60cm and the width of 30cm, and reinforcing steel bar through holes 11 are drilled in the steel plates and used for the penetration of the prestressed reinforcing steel bars. And each group of steel plates is tensioned through two pairs of prestressed steel bars which are arranged in a mutually crossed manner, and the steel plates are clamped between the repaired beam plates.

Further, rib plates 12 are welded in advance to the outer side surfaces of the two upper open-hole steel plates and the lower open-hole steel plates, wherein the rib height of the stiffening rib plate is 2cm, the thickness of the stiffening rib plate is 0.8mm, and the length of the stiffening rib plate is 60 cm.

Furthermore, the prestressed reinforcement 30 adopts a specification of phi 7, the prestress is loaded at 1860MPa, and the two ends of the prestressed reinforcement are anchored by adopting anchoring heads.

The steel plate pore canal is perforated according to the specific size of the prestressed external corrugated pipe.

The device is established and is demolishd the layer of mating formation on sideboard upper portion in advance, and the position of placing of the connecting device of new and old roof beam board is polished smoothly, and the steel sheet of being convenient for and the laminating of top bottom plate use the powerful to glue and carry out supplementary fixed to the steel sheet when necessary, prevent to take place the position in the horizontal direction and slide.

Further, in a preferred mode, the two ends of the upper and lower perforated plates in the length direction are respectively provided with a local flange 13, and the flanges 13 are subjected to secondary processing to form a protrusion of a wolf tooth bar structure, so that the protrusion can be effectively clamped and penetrated into the surface layer of the repaired beam surface, and the horizontal sliding between the upper and lower perforated steel plates and the bridge deck can be effectively prevented.

Furthermore, the local flanging is in a wolf tooth shape.

The concrete construction steps aiming at the connecting device are as follows:

the method comprises the following steps: chiseling off the paving layer on the upper portion of the old beam slab 02 bridge side plate, and placing the new beam slab 01 at a specific design position.

Step two: polishing and smoothing the connecting device placing positions of the new and old beam plates to prepare for placing the steel plate in the next step,

step three: and (4) coating super glue on the polished smooth position for assisting in temporarily fixing the steel plate.

Step four: and placing the steel plate, namely placing the upper open pore steel plate and the lower open pore steel plate in the device from the end position of the beam plate at intervals of 1 m. (Note: stiffening Ribs prewelded to Steel plate)

Step five: and placing prestressed reinforcements, wherein the two ends of the reinforcements are used for tensioning, four prestressed reinforcements can be tensioned simultaneously, or two reinforcements can be tensioned simultaneously in a symmetrical and staggered manner. In order to prevent the steel plates with the upper and lower holes from slightly moving, only a single prestressed reinforcement can be tensioned.

Step 6: and (3) supporting the template, namely supporting the bottom template at a gap between the upper steel plate and the lower steel plate, and then pouring concrete 03 to prevent the prestressed steel bars from being exposed to the outside and being oxidized, and further improve the structural performance.

The utility model provides a connecting device for new and old beam plates, which utilizes steel plates, stiffening ribs and prestressed steel bars to connect the new and old beam plates. The connection mode fully utilizes the material properties of each connecting piece, such as tension of the steel bars and bending resistance and crack resistance of the steel plates. The integrity and the integrity of the new and old beam plates are guaranteed to the maximum extent. The use of this device has reduced the construction degree of difficulty, has saved the engineering time, has ensured new and old beam slab integrality and wholeness and construction security, has strengthened structural performance greatly. Meanwhile, the operation is simple, and the construction management and the quality control are convenient.

Example two

In this embodiment, based on a modification of the first embodiment, referring to fig. 6 and 7, in this embodiment, two ends of the steel plate are not flanged, but a plurality of threaded holes are added outside the anchoring holes of the steel plate, specifically, at the position where the steel plate is combined with the new and old beam plates, and the threaded holes are distributed and arranged according to a certain rule, and a tightening screw 40 is installed in each threaded hole, and the tightening screw is pressed against the new and old beam plates, so that the height difference between the new and old beam plates is expected to be fine-adjusted.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the scope of the present invention, and various modifications and improvements of the present invention by those skilled in the art without departing from the spirit of the present invention are intended to fall within the scope of the present invention defined by the claims.

Claims

1. The connecting device for reconstructing and expanding new and old beam slabs of the expressway comprises the new and old beam slabs and a splint assembly clamped at a gap between the new and old beam slabs, wherein the splint assembly comprises an upper perforated steel plate (10), a lower perforated steel plate (10'), a prestressed reinforcement (20) and an anchoring head (30), and is characterized in that,

go up and set up two sets of perforation (11) respectively on trompil steel sheet and the lower trompil steel sheet, each group is perforated for two, and two pairs of prestressing steel alternately slant sets up and uses the first prestressing force of anchor taut on last trompil steel sheet and the lower trompil steel sheet for trompil steel sheet centre gripping is between new, old roof beam board from top to bottom.

2. The connecting device for new and old beam plates for highway reconstruction and expansion according to claim 1, wherein rib plates (12) are welded on the outer side surfaces of the upper perforated steel plate and the lower perforated steel plate, wherein the rib plates have the rib height of 2cm, the thickness of 0.8mm and the length of 60 cm.

3. The connecting device for reconstructing new and old beam slabs of expressway according to claim 1, wherein the prestressed reinforcement (30) adopts a specification of phi 7 and is prestressed under a load of 1860 MPa.

4. The connecting device for the new and old beam slabs for the reconstruction and expansion of the expressway as claimed in claim 1, wherein the joints between the upper and lower perforated steel plates and the new and old beam slabs are coated with super glue.

5. The connecting device for the new and old beam plates for the reconstruction and expansion of the expressway according to claim 1, wherein the upper and lower perforated plates are provided at both ends in the length direction with partial flanges (13), respectively.

6. The connecting device for reconstructing new and old beam slabs of an expressway according to claim 1, wherein the flange (13) has a concave-convex structure.

7. The connecting device for the new and old beam plates for the reconstruction and expansion of the expressway according to claim 1, wherein the combining parts of the upper and lower perforated steel plates and the new and old beam plates are provided with threaded holes, and the threaded holes are internally provided with tightening screws (40).