Precast beam pedestal

Abstract

The utility model discloses a precast beam pedestal which comprises a cross beam, a pair of mounting grooves formed in the top faces of the two ends of the cross beam correspondingly, and a pair of rubber plates arranged in the mounting grooves correspondingly. The rubber plates are adopted at the two ends of the pedestal to form a buffer structure, and after the precast beam is tensioned and arched, even if the stress at the two ends is increased, the footing concrete can be effectively prevented from cracking and being damaged.

Description

Technical Field

[0001] The present application belongs to the field of bridge construction, which involves the field of prefabricated beam technology, and specifically relates to a prefabricated beam pedestal. Background Art

[0002] With the rapid development of economic construction, higher requirements are placed on the construction quality of precast beams. The ends of precast beams are divided into expansion joint ends and continuous ends.

[0003] The continuous end means that the beam ends are connected in a cast-in-place form, elastic materials are filled in the expansion gap at the end of the bridge and waterproof materials are laid on it, and then viscoelastic composite materials are laid on the bridge deck pavement layer to form a continuum between the bridge deck pavement and other pavement parts.

[0004] The expansion joint end means that the beam end and the beam end are disconnected. The bridge expansion joint is set to coordinate the rotation and longitudinal displacement of the bridge end caused by natural factors. For example, when the temperature of the bridge changes, the bridge deck has longitudinal deformation due to expansion or contraction, and the vehicle load will also cause the rotation and longitudinal displacement of the beam end.

[0005] Connecting steel bars need to be reserved at the continuous end footings, while those at the expansion joint section do not. When the beam is tensioned, the prestressed steel strands are subjected to an upward bending moment, which drives the middle section of the beam to be subjected to an upward force, increasing the force on the footings at both ends. If the concrete at the footings at both ends is rectangular, excessive force will cause concrete damage and cracking. The general treatment method is to set the right-angled sides of the rectangle as chamfers to prevent stress concentration. During the actual construction process, when pouring concrete, it is necessary to insert a right-angled triangle formwork into the end. However, due to the reserved steel bars at the continuous end of the precast beam, the right-angled triangle formwork cannot be placed at the end to form a chamfer. Therefore, the concrete at the footing is damaged after the precast beam is tensioned.

[0006] To address this issue, it is necessary to develop a technical solution that is suitable for preventing the corner collapse of precast beam pedestals when precast beams are tensioned. Utility Model Content

[0007] This application proposes a simple measure to prevent the base of precast beams from cracking and breaking during the tensioning process. The advantage is that it buffers the stress on the beam body and protects the integrity of the beam body. It is suitable for various situations such as fixed pedestals, mobile pedestals, and beam ends with embedded steel bars. It has a wide range of applications and improves the quality of precast beams.

[0008]

Technical solution

[0009] A prefabricated beam pedestal, comprising:

[0010] beam,

[0011] A pair of mounting grooves are provided on the top surfaces of both ends of the beam.

[0012] A pair of rubber plates are respectively arranged in the installation grooves.

[0013] Optionally, the prefabricated beam pedestal is a concrete fixed pedestal or a steel structure movable pedestal.

[0014] After the precast beam is tensioned, its middle part bulges upward, while its two ends are pressed against the rubber plate. Due to the elasticity of the rubber plate, the rubber plate can form a buffer structure for the two ends of the precast beam. Although the force on the two ends of the precast beam increases after the precast beam is tensioned and arched, it can still effectively prevent the concrete at the base of the precast beam from cracking and damage.

[0015] Optionally, the shape of the rubber plate matches the shape of the mounting groove.

[0016] Optionally, the rubber sheet is used to contact both ends of a prefabricated beam placed on the crossbeam.

[0017] Optionally, the rubber plate is bonded to the mounting groove.

[0018] Optionally, the mounting groove is recessed downward from the top surface of the beam to form a plane, the mounting groove extends to both lateral edges of the beam, and the mounting groove is further provided with sliding grooves extending transversely along the beam on both longitudinal sides of the beam.

[0019] The rubber plate includes a bottom plate and a rubber panel fixed on the bottom plate. First sliding rods extend from opposite sides of the bottom plate respectively. The first sliding rods are used to be inserted into the sliding groove and slide laterally along the crossbeam.

[0020] Optionally, the distance between the two mounting grooves is greater than the length of the prefabricated beam.

[0021] Beneficial effects

[0022] The prefabricated beam pedestal of the present application has the following beneficial effects:

[0023] (1) Rubber plates are used at both ends of the pedestal steel plate to form a buffer structure. Even if the stress on both ends increases after the precast beam is tensioned and arched, it can effectively prevent the footing concrete from cracking and breaking;

[0024] (2) The rubber sheet can be replaced at any time after aging or damage, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above features and technical advantages of the present invention will become clearer and easier to understand by describing the embodiments thereof in conjunction with the following drawings.

[0026] Figure 1 It is a schematic diagram of the prefabricated beam in the embodiment of the present invention when being tensioned.

[0027] Figure 2It is a top view of a prefabricated beam pedestal in one embodiment of the present utility model.

[0028] Figure 3 It is a top view of a prefabricated beam pedestal in another embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of a rubber plate in another embodiment of the present invention.

[0030] Figure 5 It is a schematic diagram of a pressure plate in another embodiment of the present invention.

[0031] [Brief Explanation of Reference Numerals]

[0032] 20: Prefabricated beam pedestal 21: Crossbeam

[0033] 22: Mounting slot 23: Rubber sheet

[0034] 10: Precast beam 40: Chamfer

[0035] 50: Reserved steel bars 222: Slide groove

[0036] 231: Bottom plate 232: Rubber panel

[0037] 233: First sliding rod 60: Pressure plate

[0038] 61: Steel plate 62: Second sliding rod DETAILED DESCRIPTION

[0039] The following describes embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art will recognize that the described embodiments may be modified in various ways or combinations thereof without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of the claims. Furthermore, throughout this specification, the drawings are not drawn to scale, and like reference numerals represent like parts.

[0040] like Figure 1 、 Figure 2 As shown, a prefabricated beam pedestal 20 according to an embodiment of the present invention includes a crossbeam 21, mounting grooves 22 at both ends of the top surface of the crossbeam 21, and a rubber plate 23. The crossbeam 21 is a steel structure component. The steel structure is a structure composed of steel materials. The structure is mainly composed of steel beams, steel columns, steel trusses and other components made of steel sections and steel plates. The components or parts are connected by welds, bolts or rivets.

[0041] Mounting slots 22 are provided at both ends of the top surface of the crossbeam 21. The mounting slots 22 are recessed downward from the top surface of the crossbeam 21 to form a flat surface. A rubber sheet 23 is provided within each mounting slot 22. The shape of the rubber sheet 23 matches the shape of the mounting slot 22. For example, if the mounting slot 22 is rectangular, the rubber sheet 23 should also be rectangular. The rubber sheet 23 is designed to contact the ends of the precast beam 10 placed on the crossbeam 21. Specifically, the position of the mounting slots 22 should be determined based on the length of the precast beam to be manufactured. The distance between the two mounting slots 22 should be greater than the length of the precast beam 10 so that both ends of the precast beam 10 can be placed on the rubber sheet 23.

[0042] The rubber plate 23 may be fixed in the mounting groove 22 by bonding.

[0043] like Figure 1 In the figure, the precast beam 10 is placed on the top surface of the pedestal 20. The left end of the precast beam 10 is the expansion joint end. The foot of the expansion joint end has a chamfer 40, while the foot of the continuous end cannot be chamfered due to the reserved steel bars 50. Figure 1 This is the case where the precast beam 10 is arched after being tensioned. It can be seen that the middle part of the precast beam 10 bulges upward after being tensioned, while its two ends are pressed against the rubber plate 23. The two ends of the precast beam 10 are pressed against the rubber plate 23. Due to the elasticity of the rubber plate 23, the rubber plate 23 can form a buffer structure for the two ends of the precast beam. Although the forces on the two ends of the precast beam 10 increase after being tensioned and arched, it can still effectively prevent the concrete at the base of the precast beam from cracking and damage.

[0044] According to another embodiment of the present invention, further, Figure 3 As shown, the installation groove 22 extends to both side transverse edges of the crossbeam 21 , and the installation groove 22 is further provided with sliding grooves 222 extending transversely along the crossbeam on both sides of the longitudinal direction of the crossbeam 21 .

[0045] like Figure 4 As shown, the rubber plate 23 includes a bottom plate 231 and a rubber panel 232 covering the bottom plate 231. First sliding rods 233 extend from opposite sides of the bottom plate 231. The first sliding rods 233 are configured to be inserted into the slide grooves 222, thereby pushing the rubber plate 23 horizontally along the crossbeam 21 to a desired position.

[0046] The rubber panel 232 may be fixed to the bottom plate 231 by bonding.

[0047] like Figure 5As shown, the pedestal 20 further includes a pressure plate 60, which includes a steel plate 61 and second sliding rods 62 extending from opposite sides of the steel plate 61. In this way, when manufacturing the precast beam 10, the pressure plate can be installed in the installation groove 22, and the second sliding rods 62 of the pressure plate 60 can be inserted into the slide grooves 222 on both sides of the installation groove 22, thereby ensuring the supporting rigidity of the pedestal 20 when manufacturing the precast beam 10.

[0048] When the precast beam 10 needs to be tensioned, the pressure plate 60 is removed from the mounting slot 22 using the second sliding rod 62, and the first sliding rods 233 of the rubber plate 23 are inserted into the sliding slots 222, respectively, to push the rubber plate 23 into the appropriate position. During the tensioning process, the two ends of the precast beam 10 rest against the rubber plate 23, forming a buffer structure for the footings of the precast beam 10. Even if the stress on the two ends of the precast beam 10 increases after the precast beam 10 is tensioned and arched, the concrete at the footings can be effectively prevented from cracking or breaking.

[0049] The present application also provides a method for using a prefabricated beam pedestal, comprising:

[0050] Step S1, making a prefabricated beam 10 on a prefabricated beam pedestal 20 and curing it, wherein both ends of the prefabricated beam 10 should be placed on a rubber plate 23;

[0051] Step S2, after the curing is completed, the precast beam 10 is tensioned on the precast beam pedestal 20. During the tensioning process of the precast beam 10, since the two ends of the precast beam 10 are against the rubber plate 23, a buffer structure can be formed for the two end feet of the precast beam 10. Even if the force on the two ends of the precast beam 10 increases after the precast beam 10 is tensioned and arched, it can effectively prevent the footing concrete from cracking and damaging.

[0052] This application also provides another method for using a prefabricated beam pedestal, including:

[0053] Step S11, inserting the second sliding rod 62 into the sliding groove 222, sliding along the sliding groove 222, and moving the pressure plate 60 into position;

[0054] Step S12: fabricating and curing the precast beam 10 on the precast beam pedestal 20 , wherein both ends of the precast beam 10 should be placed on the bearing plate 60 ;

[0055] In step S13, after curing is completed, the first sliding rod 233 is inserted into the slide groove 222, pushing the rubber plate 23 to move, ejecting the pressure plate 60 from the mounting groove 22. The rubber plate 23 is moved into position so that both ends of the precast beam 10 are placed on the rubber plate 23. It should be noted that during the process of ejecting the pressure plate 60 using the rubber plate 23, a hydraulic rod can be used to push the rubber plate to move. This is a conventional technical method and will not be further explained here.

[0056] In step S14, the precast beam 10 is tensioned on the precast beam pedestal 20. During the tensioning process of the precast beam 10, since the two ends of the precast beam 10 are against the rubber plate 23, a buffer structure can be formed for the two end feet of the precast beam 10. Even if the force on the two ends of the precast beam 10 increases after the precast beam 10 is tensioned and arched, the concrete of the footing can be effectively prevented from cracking and breaking.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or 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 prefabricated beam pedestal, characterized in that: include: beam, A pair of mounting grooves are respectively arranged on the top surfaces of both ends of the beam. A pair of rubber plates are respectively arranged in the mounting grooves, The mounting groove is sunken downward from the top surface of the beam to form a plane, and the mounting groove extends to the two lateral edges of the beam, and the mounting groove is also provided with sliding grooves extending along the lateral direction of the beam on both longitudinal sides of the beam. The rubber plate comprises a bottom plate and a rubber panel fixed on the bottom plate. First sliding rods extend from opposite sides of the bottom plate respectively. The first sliding rods are used to be inserted into the sliding groove and slide transversely along the crossbeam.

2. The prefabricated beam pedestal according to claim 1, characterized in that: The prefabricated beam pedestal is a concrete fixed pedestal or a steel structure movable pedestal.

3. The prefabricated beam pedestal according to claim 1, characterized in that: The shape of the rubber plate matches the shape of the mounting groove.

4. The prefabricated beam pedestal according to claim 1, characterized in that: The rubber sheet is used to contact both ends of the precast beam placed on the crossbeam.

5. The prefabricated beam pedestal according to claim 1, characterized in that: The rubber plate is bonded to the mounting groove.

6. The prefabricated beam pedestal according to claim 1, characterized in that: The distance between the two mounting grooves is greater than the length of the precast beam.

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