Large-span prestressed bent cap support

Abstract

This invention discloses a large-span prestressed cap beam support, comprising: embedded steel plates and a load-bearing bottom beam; the embedded steel plates are fixed by anchor bolts and horizontally buried under the roadbed, and steel columns perpendicular to them are provided on the embedded steel plates, with at least two embedded steel plates symmetrically arranged; the load-bearing bottom beam is symmetrically erected between the tops of the two steel columns, and multiple vertically arranged support columns are provided on the load-bearing bottom beam, with a load-bearing top beam fixed at the top of the support columns; inclined struts are provided between adjacent support columns, with both ends of the struts located at the ends of the support columns; buffer columns connected to the struts are provided on the load-bearing bottom beam, and the buffer columns are used to disperse the force on the struts; this invention, through the setting of buffer columns, in conjunction with the struts, disperses the pressure on the load-bearing top beam during the cap beam casting and construction process, improves its bending strength under pressure, ensures the levelness of the cap beam during casting and construction, and also facilitates the reuse of the cap beam support.

Description

Technical Field

[0001] This invention relates to the field of highway bridge construction technology, specifically to a large-span prestressed cap beam support. Background Technology

[0002] In highway construction, the most direct and effective way to ensure that the overpass bridge structure does not affect vehicle traffic during construction is to set up a prestressed cap beam that spans the entire width of the highway.

[0003] Currently, the most commonly used method for constructing cap beams is the ground-supported scaffolding method. The scaffolding can be constructed using universal joints or steel pipe supports. The weight of all temporary facilities and the cap beam itself is borne by the scaffolding and directly transferred to the ground. Because the form and height of the scaffolding can be varied according to the surrounding terrain and the height of the pier, this method is flexible and does not require embedded parts on the pier, thus not affecting the appearance of the pier, and is therefore widely used in cap beam construction.

[0004] However, the scaffolding method requires high bearing capacity of the foundation, generally necessitating compaction of the foundation, and for soft soil foundations, a concrete slab needs to be poured. Therefore, foundation treatment requires significant manpower and resources. Even slight negligence in foundation treatment can cause the entire scaffolding to sink, severely impacting the construction quality of the cap beam. When the piers are high, the scaffolding must be pre-stressed to eliminate inelastic deformation, which consumes substantial manpower and resources. Adjusting the bottom formwork height due to changes in pier height is economically unfeasible for steel pipe scaffolding, and also requires a large amount of unnecessary manpower. For high piers, the scaffolding is massive, requiring huge investment, and installation is time-consuming and labor-intensive. Thus, while the scaffolding method is convenient and flexible, it has inherent drawbacks, and special attention must be paid to the stability of the scaffolding, inelastic deformation, and foundation settlement during construction.

[0005] Therefore, there is a need to provide a large-span prestressed cap beam support to solve the problems of poor bending strength and stability of the cap beam support under pressure in the existing technology, which affect the levelness of the cap beam during casting and construction. Summary of the Invention

[0006] The purpose of this invention is to provide a large-span prestressed cap beam support to solve the problems of poor bending strength and stability of cap beam supports under pressure in the prior art, which affect the levelness of the cap beam during casting and construction.

[0007] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0008] In a first aspect of the invention, a large-span prestressed cap beam support is provided, comprising: an embedded steel plate, which is fixed by anchor bolts and horizontally buried under the roadbed, and a steel column perpendicular to it is provided on the embedded steel plate, and at least two embedded steel plates are symmetrically arranged; a load-bearing bottom beam, which is symmetrically erected between the tops of the two steel columns, and a plurality of vertically arranged support columns are provided on the load-bearing bottom beam, and a load-bearing top beam is fixed on the top of the support columns; wherein, an inclined strut is provided between adjacent support columns, and the two ends of the strut are respectively located at the ends of the support columns, and a buffer column connected to the strut is provided on the load-bearing bottom beam, the buffer column being used to distribute the force on the strut.

[0009] Furthermore, the buffer column includes a rubber column, the top surface of which is inclined along the direction of the strut; wherein, a through groove for the strut to pass through is provided radially on the top surface of the rubber column, and the central axis of the rubber column passes through the center of gravity of the strut.

[0010] Furthermore, the strut is provided with convex rings arranged equidistantly along its axial direction, and the through groove is provided with concave rings arranged equidistantly along its axial direction; wherein, the convex rings and concave rings can be locked together to stabilize the relative position of the strut and the rubber column.

[0011] Furthermore, a limiting cylinder is fitted around the periphery of the rubber column, with a gap between the top of the limiting cylinder and the lowest point of the top surface of the rubber column; one end of the limiting cylinder is fixed to the load-bearing bottom beam to stabilize the relative position of the rubber column and the load-bearing bottom beam.

[0012] Furthermore, the strut is provided with a support rod perpendicular to it on its periphery; wherein, two support rods are arranged opposite each other on the periphery of the strut, and the ends of the support rods extend to the ends of the support column.

[0013] Furthermore, the limiting cylinder is provided with an air cushion cylinder whose periphery is in contact with the rubber column; wherein, the upper edge of the air cushion cylinder and the upper edge of the limiting cylinder are sealed to form a deformation cavity between the outer wall of the air cushion cylinder and the inner wall of the limiting cylinder; a number of air pressure holes are opened on the periphery of the limiting cylinder.

[0014] Furthermore, a movable plug is provided inside the air pressure hole; wherein, the plug is cylindrical and has a sealing rubber ring on its periphery to block the air pressure hole, so that the plug can slide axially when the air pressure in the deformation cavity changes.

[0015] Furthermore, the outer periphery of the air cushion cylinder is provided with protrusions corresponding to the air pressure holes, and the protrusions can enter the air pressure holes when the air cushion cylinder undergoes expansion deformation.

[0016] Furthermore, the outlet end of the air pressure port is provided with a limiting ring for restricting the position of the plug.

[0017] Furthermore, the plug is connected to a pressure scale rod that can extend into a pressure port.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] This invention aims to distribute the pressure on the load-bearing top beam during the construction of the cap beam by setting buffer columns in conjunction with struts, thereby improving its bending strength under pressure, ensuring the levelness of the cap beam during construction, and also facilitating the reuse of the cap beam support. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] Figure 1 A structural schematic diagram of a large-span prestressed cap beam support provided by the present invention;

[0022] Figure 2 for Figure 1 Enlarged view of section I;

[0023] Figure 3 This is a schematic diagram of the structure of the buffer column in one embodiment of the present invention;

[0024] Figure 4 for Figure 3 Exploded view;

[0025] Figure 5 This is a cross-sectional view of the buffer column in another embodiment provided by the present invention;

[0026] Figure 6 for Figure 5 Enlarged view of section II.

[0027] The labels in the diagram represent the following:

[0028] 1. Embedded steel plate; 11. Steel column; 2. Load-bearing bottom beam; 21. Support column; 22. Load-bearing top beam; 23. Support rod; 24. Convex ring; 25. Support rod; 3. Buffer column; 31. Rubber column; 32. Through groove; 33. Concave ring; 34. Limiting cylinder; 35. Air cushion cylinder; 36. Air pressure hole; 37. Plug; 38. Protrusion; 39. Limiting ring; 310. Pressure scale rod. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figure 1-2 As shown, the present invention provides a large-span prestressed cap beam support, comprising:

[0031] An embedded steel plate 1 is fixed by anchor bolts and horizontally buried under the roadbed. The embedded steel plate 1 is provided with steel columns 11 perpendicular to it. At least two embedded steel plates 1 are provided symmetrically.

[0032] The load-bearing bottom beam 2 is symmetrically erected between the tops of two steel columns 11. The load-bearing bottom beam 2 is provided with multiple vertically arranged support columns 21, and the top of the support columns 21 is fixed with a load-bearing top beam 22.

[0033] Among them, there is an inclined support rod 23 between adjacent support columns 21, with the two ends of the support rod 23 respectively located at the ends of the support column 21. The load-bearing bottom beam 2 is provided with a buffer column 3 connected to the support rod 23, and the buffer column 3 is used to distribute the force on the support rod 23.

[0034] This invention aims to disperse the pressure on the load-bearing top beam 22 during the construction of the cap beam by setting up buffer columns 3 in conjunction with support rods 23, thereby improving its bending strength under pressure, ensuring the levelness of the cap beam during construction, and facilitating the reuse of the cap beam support. Specifically, in the actual construction process, during foundation construction, the pre-embedded steel plate 1 is first flatly embedded under the roadbed using Ф25mm anchor bolts. The thickness of the pre-embedded steel plate 1 is 2cm. The top surface of the pre-embedded steel plate 1 is connected to the steel column 11 by perforated plug welding. Then, the position of the steel column 11 is fixed. The steel column 11 near the pier can be equipped with attachments connected to the pier. The attachments can be welded or clamped to the steel column 11, and the attachments can be welded or clamped to the pier using pre-embedded parts. Then, the steel column 11 is fixed in position. Four trapezoidal steel plates, each 16mm thick, 800mm long at the top (700mm long at the bottom), and 300mm wide, are welded around the head pipe opening to form a grid shape. A 16mm thick steel plate is then welded on top to serve as a sand cylinder support, on which a sand cylinder can be placed. Finally, the load-bearing bottom beam 2 is arranged transversely on the sand cylinder. Then, the load-bearing top beam 22 is installed transversely upwards by installing support columns 21. Support rods 23 are then installed between the support columns 21, and buffer columns 3 are set below the support rods 23 to achieve the joint load-bearing of the load-bearing bottom beam 2 and the load-bearing top beam 22.

[0035] In the above embodiments, the buffer column 3 is mostly made of flexible materials, such as rubber, silicone, plastic, etc. However, since it is in contact with the inclined support rod 23, in order to adapt to the inclination of the support rod 23, the top surface of the buffer column 3 often needs to be set as an inclined surface. This will cause the force on the buffer column 3 to be dispersed along the normal direction of the top inclined surface. When the contact surface of the support rod 23 pressing against the buffer column 3 is not firm, the buffer column 3 is easily bent by the non-circumferential pressure it receives, which is not conducive to improving the compressive and bending resistance of the load-bearing top beam 22.

[0036] To solve the above problems, such as Figure 3-4 As shown, in the preferred embodiment provided by the above embodiments of the present invention, the buffer column 3 includes a rubber column 31, the top surface of the rubber column 31 is inclined along the inclined direction of the support rod 23; wherein, a through groove 32 for the support rod 23 to pass through is radially opened on the top surface of the rubber column 31, and the central axis of the rubber column 31 passes through the center of gravity of the support rod 23.

[0037] More specifically, the strut 23 is provided with convex rings 24 arranged equidistantly along its axial direction, and the through groove 32 is provided with concave rings 33 arranged equidistantly along its axial direction; wherein the convex rings 24 and concave rings 33 can be locked together to stabilize the relative position of the strut 23 and the rubber column 31.

[0038] In this embodiment, the cooperation between the convex ring 24 on the support rod 23 and the concave ring 33 on the through groove 32 makes the relative position between the rubber column 31 and the support rod 23 more stable when under pressure, which can limit the bending deformation of the rubber column 31 due to excessive pressure.

[0039] The following describes the operation of the strut 23 and the through groove 32. Figure 3 A three-dimensional structural diagram of the strut 23 inside the rubber column 31 is shown. Figure 4 for Figure 3 The exploded view shows that a portion of the pressure on the strut 23 is transmitted to the rubber column 31 along the direction of gravity, and a portion of this force forms a component force along the normal direction of the top inclined surface of the rubber column 31. When this normal component force is too large, it will bend the rubber column 31, reducing its axial compressive strength to a certain extent. In this embodiment, the use of a convex ring 24 and a concave ring 33 that can lock into each other allows the strut 23 to be pressed into the concave ring 33 to limit its movement when it compresses the rubber column 31. Due to the limiting effect between the convex ring 24 and the concave ring 33, the bending resistance of the rubber column 31 is increased, thereby preventing the normal component force on the top inclined surface of the rubber column 31 from gradually bending the rubber column 31 and reducing its compressive strength.

[0040] In the above embodiments, since the rubber column 31 and the load-bearing bottom beam 2 are made of different materials, the effect of fixing them together by means of connectors is not good. During the compression process of the rubber column 31, there is a risk of fixation failure between the rubber column 31 and the load-bearing bottom beam 2.

[0041] To resolve the above issues, please continue reading Figure 3-4 As shown, a limiting cylinder 34 is sleeved around the rubber column 31, and a gap is left between the top of the limiting cylinder 34 and the lowest point of the top surface of the rubber column 31; wherein, one end of the limiting cylinder 34 is fixed to the load-bearing bottom beam 2 to stabilize the relative position of the rubber column 31 and the load-bearing bottom beam 2.

[0042] In this embodiment, by setting a limiting cylinder 34 that can be welded to the load-bearing bottom beam 2, most of the rubber column 31 is placed inside the limiting cylinder 34, which not only improves the bending resistance of the rubber column 31, but also makes its position on the load-bearing bottom beam 2 more stable.

[0043] In the above embodiments, since the span of the cap beam support is generally large, the length of the strut 23 that supports the load-bearing bottom beam 2 and the load-bearing top beam 22 is also relatively long. When only the buffer column 3 provides pressure buffering and transmission, the force distribution on the strut 23 will be uneven, resulting in stress concentration, reducing the bending resistance of the strut 23, and making its support effect on the load-bearing bottom beam 2 and the load-bearing top beam 22 poor.

[0044] To resolve the above issues, please continue reading Figure 1-2 As shown, a support rod 25 perpendicular to the support rod 23 is provided around the support rod 23;

[0045] Two support rods 25 are arranged opposite each other on the periphery of the strut 23, and the ends of the support rods 25 extend to the ends of the support column 21.

[0046] In this embodiment, the support rod 25 supports the strut 23, which allows the force on the load-bearing top beam 22 to be transmitted to the strut 23 in multiple directions, making the force distribution on the strut 23 more uniform. It can also form multiple triangular structures between the load-bearing bottom beam 2 and the load-bearing top beam 22, which is beneficial to improving the stability of the square area enclosed by the load-bearing bottom beam 2, the column 21, and the load-bearing top beam 22.

[0047] In the above embodiments, when the rubber column 31 is subjected to pressure, its overall compression causes the volume of the rubber column 31 located inside the limiting cylinder 34 to expand. During long-term use, this can easily cause cracks at the welded joints of the side wall and bottom surface of the limiting cylinder 34, or cracks at the welded joints of the side wall of the limiting cylinder 34 and the load-bearing bottom beam 2, reducing the service life of the limiting cylinder 34 and also reducing the limiting effect that the limiting cylinder 34 can play on the rubber column 31.

[0048] To solve the above problems, such as Figure 5As shown, in another embodiment of the present invention, the limiting cylinder 34 is provided with an air cushion cylinder 35 whose periphery is in contact with the rubber column 31;

[0049] The upper edge of the air cushion cylinder 35 and the upper edge of the limiting cylinder 34 are sealed to form a deformation cavity between the outer wall of the air cushion cylinder 35 and the inner wall of the limiting cylinder 34.

[0050] Several air pressure holes 36 are provided on the periphery of the limiting cylinder 34.

[0051] In this embodiment, by setting an air cushion 35 between the rubber column 31 and the inner wall of the limiting cylinder 34, the rubber column 31 is wrapped inside the air cushion 35. The deformation tension generated by the rubber column 31 when it is compressed is buffered by the air cushion 35 and then transmitted to the side wall of the limiting cylinder 34. This helps to protect the limiting cylinder 34 and avoid the problem of fastening failure caused by the deformation tension of the rubber column 31 for a long time. Furthermore, in order to prevent the air cushion 35 from being squeezed and to improve its durability, an air pressure hole 36 needs to be set on the side wall of the limiting cylinder 34 in actual use so that when the rubber column 31 squeezes the air cushion 35, the air in the deformation cavity can be discharged through the air pressure hole 36 to balance the air pressure inside and outside the limiting cylinder 34.

[0052] In the above embodiment, since the air pressure hole 36 is open, the inside of the limiting cylinder 34 cannot be isolated from the outside, which is not conducive to improving the overall sealing effect. Moreover, rainwater, dust and other environmental elements can easily enter the inside of the limiting cylinder 34 through the air pressure hole 36 and come into contact with the air cushion cylinder 35. Over time, this will cause the air cushion cylinder 35 to be corroded by weakly acidic rainwater, reducing its performance.

[0053] To solve the above problems, such as Figure 6 As shown, in another embodiment of the present invention, a movable plug block 37 is provided inside the air pressure hole 36;

[0054] The plug 37 is cylindrical and has a sealing rubber ring on its periphery to block the air pressure hole 36, so that the plug 37 can slide axially when the air pressure in the deformation cavity changes.

[0055] More specifically, in order to compress the air in the air pressure hole 36 more promptly during the deformation of the air cushion cylinder 35 and to more easily push the displacement of the plug 37, in another embodiment provided by the present invention, the outer periphery of the air cushion cylinder 35 is provided with a protrusion 38 corresponding to the air pressure hole 36, and the protrusion 38 can enter the air pressure hole 36 when the air cushion cylinder 35 undergoes expansion deformation.

[0056] More specifically, in order to prevent the plug 37 from coming out of the air pressure hole 36 during the process, in another embodiment of the present invention based on the above embodiments, the air outlet end of the air pressure hole 36 is provided with a limiting ring 39 for limiting the position of the plug 37.

[0057] More specifically, in order to monitor the pressure changes borne by the rubber column 31, in another embodiment of the present invention based on the above embodiments, the plug 37 is connected to a pressure scale rod 310 that can extend out of the air pressure hole 36.

[0058] The operation of the plug 37 in this embodiment will be described below. Figure 5 A cross-sectional view of the limiting cylinder 34 is shown. Figure 6 for Figure 5 A partial view. In the initial state, the rubber column 31 maintains its original shape without pressure, and the protrusion 38 on the air cushion cylinder 35 is close to and corresponds to the air pressure hole 36. When the upper part of the rubber column 31 is compressed, its lower part expands towards the side wall of the limiting cylinder 34 due to elastic deformation, thereby pressing against the air cushion cylinder 35 and compressing the gas in the deformation cavity. This uses compressed air to push the plug 37 to do work, causing the plug 37 to slide in the air pressure hole 36 until the plug 37 and the limiting ring 39 reach the maximum pressure load value. When the pressure on the rubber column 31 is relieved and it is no longer under pressure, during its deformation recovery process, the gas in the air pressure hole 36 returns to the deformation cavity due to the expansion of the deformation cavity volume. At the same time, due to the negative pressure formed inside the plug 37, the plug 37 can automatically reset. It should be noted that in order to further improve the buffering effect of the air cushion cylinder 35 and the deformation cavity formed between it and the limiting cylinder 34, the gas in the deformation cavity can be replaced with a buffer solution.

[0059] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A large-span prestressed cap beam support, characterized in that, include: An embedded steel plate (1) is fixed by anchor bolts and horizontally buried under the roadbed. The embedded steel plate (1) is provided with steel columns (11) perpendicular to it. At least two embedded steel plates (1) are provided symmetrically. The load-bearing bottom beam (2) is symmetrically mounted between the tops of the two steel columns (11). The load-bearing bottom beam (2) is provided with multiple vertically arranged support columns (21), and the top of the support columns (21) is fixedly provided with a load-bearing top beam (22). Among them, an inclined support rod (23) is provided between adjacent support columns (21), and the two ends of the support rod (23) are respectively provided at the ends of the support column (21). A buffer column (3) connected to the support rod (23) is provided on the load-bearing bottom beam (2). The buffer column (3) is used to disperse the force on the support rod (23). The buffer column (3) includes a rubber column (31), the top surface of which is inclined along the inclination direction of the support rod (23); The top surface of the rubber column (31) is provided with a through groove (32) for the support rod (23) to pass through, and the central axis of the rubber column (31) passes through the center of gravity of the support rod (23). The support rod (23) is provided with convex rings (24) arranged equidistantly along its axial direction, and the through groove (32) is provided with concave rings (33) arranged equidistantly along its axial direction. The convex ring (24) and concave ring (33) can be locked together to stabilize the relative positions of the support rod (23) and the rubber column (31).

2. The large-span prestressed cap beam support according to claim 1, characterized in that, A limiting cylinder (34) is sleeved around the periphery of the rubber column (31), and a gap is left between the top of the limiting cylinder (34) and the lowest point of the top surface of the rubber column (31). One end of the limiting cylinder (34) is fixed to the load-bearing bottom beam (2) to stabilize the relative position of the rubber column (31) and the load-bearing bottom beam (2).

3. A large-span prestressed cap beam support according to claim 2, characterized in that, The support rod (23) is provided with a support rod (25) perpendicular to it on its periphery; Two of the support rods (25) are arranged opposite each other on the periphery of the strut (23), and the ends of the support rods (25) extend to the ends of the support column (21).

4. A large-span prestressed cap beam support according to claim 3, characterized in that, The limiting cylinder (34) is provided with an air cushion cylinder (35) whose periphery is in contact with the rubber column (31). The upper edge of the air cushion cylinder (35) and the upper edge of the limiting cylinder (34) are sealed to form a deformation cavity between the outer wall of the air cushion cylinder (35) and the inner wall of the limiting cylinder (34). The limiting cylinder (34) has several air pressure holes (36) on its periphery.

5. A large-span prestressed cap beam support according to claim 4, characterized in that, The air pressure hole (36) is provided with a movable plug (37); The plug (37) is columnar and has a sealing rubber ring on its periphery to block the air pressure hole (36), so that the plug (37) can slide axially when the air pressure of the deformation cavity changes.

6. A large-span prestressed cap beam support according to claim 5, characterized in that, The outer periphery of the air cushion cylinder (35) is provided with a protrusion (38) corresponding to the air pressure hole (36). The protrusion (38) can enter the air pressure hole (36) when the air cushion cylinder (35) undergoes expansion deformation.

7. A large-span prestressed cap beam support according to claim 6, characterized in that, The air outlet end of the air pressure hole (36) is provided with a limiting ring (39) for limiting the position of the plug (37).

8. A large-span prestressed cap beam support according to claim 7, characterized in that, The plug (37) is connected to a pressure scale rod (310) that can extend out of the air pressure hole (36).

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