Existing concrete box girder top collaborative stress system and construction method

Abstract

The invention aims to provide the cooperative stress system for the top of the existing concrete box girder and the construction method, which can adapt to long-time stress and improve the local supporting force of the box girder platform. The device comprises a box girder, wherein a supporting cavity is formed in the box girder; the canopy supporting legs are fixedly connected with the upper surface of the box girder; the anchor plate is arranged on the upper surface of the supporting cavity, and the anchor plate is fixedly connected with the canopy supporting legs through a plurality of locking pieces; the fixed base is fixedly connected to the lower surface of the supporting cavity, and a groove is formed in the middle of the fixed base; the upper part of the upper supporting piece is fixedly connected with the anchor plate; the lower supporting piece is fixedly connected with the groove, and a plurality of connecting holes are formed in the upper surface of the lower supporting piece; the two supporting assemblies are symmetrically arranged between the upper supporting piece and the lower supporting piece and used for transmitting loads. The platform box girder supporting system is applied to the technical field of platform box girder supporting systems.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of platform box girder support system, in particular to a existing concrete box girder top collaborative stress system and construction method. BACKGROUND

[0002] In recent years, China's railway construction has developed rapidly, and the platform canopy project is an important part of the railway station, which is a traffic channel between the train and the station building and a waiting position for the crowd, ensuring the comfort and safety of passengers. Due to the increasing number of high-speed trains, some station supporting facilities cannot meet the current operation needs, and some station platforms need to be extended, and the canopy on the platform needs to be extended simultaneously according to the needs of the platform.

[0003] The extension of the canopy of the station platform is mainly to extend the steel structure canopy, and when the steel structure canopy is extended, a plurality of support columns are added to the surface of the box girder structure platform to provide stable support force. Because the area of the added column connection point is much smaller than the area of the top surface of the platform box girder, the local stress of the top surface of the box girder is easily too large to cause damage. The current common top tightening reinforcement measure of the platform uses a hydraulic system or a screw tightening device to enhance the support force of the box girder structure, but vibration occurs when the train passes, and the hydraulic system or the screw tightening device forms mechanical fatigue under long-term high-frequency vibration, which reduces the support force and affects the stability of the box girder structure, and frequent maintenance and repair are required. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide an existing concrete box girder top collaborative stress system and construction method which can adapt to long-term stress and improve the local support force of the box girder platform.

[0005] The technical solution adopted by the present application is: the present application comprises a box girder, a support cavity is formed in the box girder; a canopy support foot is fixedly connected with the upper surface of the box girder; an anchor plate is arranged on the upper surface of the support cavity, and the anchor plate is fixedly connected with the canopy support foot through a plurality of locking members; a fixed base is fixedly connected to the lower surface of the support cavity, and a recess is formed in the middle of the fixed base; an upper support member is fixedly connected with the anchor plate; a lower support member is fixedly connected with the recess, and a plurality of connecting holes are formed on the upper surface of the lower support member; two groups of support assemblies are symmetrically arranged between the upper support member and the lower support member, and are used for transmitting load.

[0006] Further, the middle part of the lower surface of the upper support is provided with two groups of first ear plates, and each first ear plate is provided with a second ear plate on both sides; the support assembly comprises two connecting seats, two first support rods, two inclined support rods and an adjusting pull rod, each connecting seat is detachably connected with a corresponding connecting hole, one end of each first support rod is hingedly connected with a corresponding second ear plate, the other end of each first support rod is hingedly connected with a corresponding connecting seat, one end of each inclined support rod is hingedly connected with the first ear plate, and the other end of each inclined support rod is hingedly connected with a corresponding connecting seat, and the end of the adjusting pull rod is hingedly connected with a corresponding connecting seat, and the middle part of the adjusting pull rod is provided with a tension sleeve for adjusting the length.

[0007] Further, the upper part of the lower support is provided with a mounting plate, and a plurality of connecting holes are symmetrically arranged on the mounting plate; the connecting seat comprises a bottom plate, a connecting ear plate, a connecting pin shaft, a pressing plate and two pads, the bottom plate is above the mounting plate, the connecting ear plate is arranged in the middle part of the bottom plate, the connecting pin shaft penetrates the middle part of the connecting ear plate, the ends of the connecting pin shaft are hingedly connected with the first support rod and the inclined support rod respectively, the pressing plate is arranged below the mounting plate, the pressing plate is detachably connected with the bottom plate through a fixing bolt, one pad is arranged between the bottom plate and the mounting plate, and the other pad is arranged between the pressing plate and the mounting plate.

[0008] Further, the pad is made of polytetrafluoroethylene.

[0009] Further, the adjusting pull rod is provided with two fixed pull rods, and each fixed pull rod is provided with a threaded segment threadedly matched with the tension sleeve.

[0010] Further, the length of the first support rod is greater than the distance between the lower surface of the lower support and the upper surface of the lower support.

[0011] Further, the angle between the first support rod and the inclined support rod connected with the same connecting seat ranges from 43 to 47 degrees.

[0012] Further, the construction method comprises the following steps: S1, the upper support and the lower support are prefabricated and processed in the factory, a fixed base is prefabricated at the bottom of the support cavity, and the anchor plate and the shed foot are connected and fixed through the locking member at the upper part of the support cavity; S2, the upper part of the upper support is welded and fixed with the anchor plate, and the lower part of the lower support is put into the groove and aligned with the upper support; S3, the lower support is fixed by filling concrete in the groove; S4, each connecting seat is connected with a corresponding connecting hole and is tightened by a fixing bolt. S5, measure the distance between the upper support and the lower support, and record as H, preliminarily determine the length of the first struts and the inclined struts; S6, install the adjusting pull rods between the first struts on both sides and the two connecting seats, adjust the tensioning sleeves to move the two connecting seats to the center line direction of the lower support, and the two first struts are in a preliminary clamping state; S7, install the inclined struts in the middle, the inclined struts cooperate with the first struts to form a W-shaped web, and the tensioning sleeves are adjusted again to move the two connecting seats to the center line direction of the lower support, and the multiple first struts and the multiple inclined struts are finally clamped.

[0013] Further, in step S3, the fixed base is C30 concrete, and the concrete filled into the groove is C40 concrete.

[0014] Further, in step S2, the distance between the upper support and the lower support is controlled between 200mm to 300mm.

[0015] The beneficial effects of the present application are: the present application increases the support assembly between the top plate and the bottom plate of the box girder, so that the top plate load is transmitted to the bottom plate along the support assembly, and the top and bottom plates achieve a synergistic stress effect; the adjusting pull rod is connected to the intermediate tensioning sleeve through threads, the length of the two fixed pull rods is adjusted, and the length of the adjusting pull rod changes while pulling the connecting seat, so that the connecting seat slides along the center line direction of the lower support through the pad, and then drives the first struts on both sides to tighten to the center line direction, realizes kinetic energy transmission, and through the deformation adjustment of the first struts and the inclined struts, the upper support and the lower support are in a clamping state, and the upper support, the lower support and the support assembly cooperate to form a truss system, so that the top plate load is transmitted to the bottom plate, and the top and bottom plates achieve a synergistic stress effect, which is flexible and convenient to use, and the clamping state can be adjusted according to the actual situation; the W-shaped support structure is formed by multiple groups of connecting rods, the load transmission is stable, the vibration resistance is high, and long-term use and stress resistance can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of the present application; Figure 2 is Figure 1 is a partial enlarged view of part A in the middle; Figure 3 is Figure 1 is a partial enlarged view of part B in the middle; Figure 4 is a first sectional view of the present application; Figure 5 is a second sectional view of the present application.

[0017] In the figure: 1, canopy foot; 2, box girder; 3, anchor plate; 4, locking piece; 5, fixed base; 6, upper support; 61, first ear plate; 62, second ear plate; 7, lower support; 71, connecting hole; 72, mounting plate; 8, support assembly; 81, connecting seat; 811, bottom plate; 812, connecting ear plate; 813, connecting pin shaft; 814, pressing plate; 815, pad plate; 816, fixing bolt; 82, first brace; 83, diagonal brace; 84, adjusting pull rod; 85, tension sleeve. DETAILED DESCRIPTION

[0018] As Figures 1 to 5 shown in the embodiment, the present application comprises a box girder 2, a support cavity is formed in the box girder 2; a canopy foot 1 is fixedly connected with the upper surface of the box girder 2; an anchor plate 3 is arranged on the upper surface of the support cavity, and the anchor plate 3 is fixedly connected with the canopy foot 1 through a plurality of locking pieces 4; a fixed base 5 is fixedly connected to the lower surface of the support cavity, and a recess is formed in the middle of the fixed base 5; an upper support 6 is fixedly connected with the anchor plate 3 at the upper portion; a lower support 7 is fixedly connected with the recess, and a plurality of connecting holes 71 are formed on the upper surface of the lower support 7; two groups of support assemblies 8 are symmetrically arranged between the upper support 6 and the lower support 7, and are used to transmit load.

[0019] Specifically, the recess depth is not less than 50 mm, and is controlled to be between 50 mm and 100 mm; the connecting hole 71 is a waist-shaped hole, and the connecting seat 81 can move forward and backward in the connecting hole 71 to achieve the effect of adjusting the clamping state; The distance between the upper support 6 and the lower support 7 is between 200 mm and 300 mm. If the distance between the upper support 6 and the lower support 7 is greater than 300 mm, the load borne by the support assembly 8 is increased, and the stability of the support assembly 8 is weakened. If the distance between the upper support 6 and the lower support 7 is less than 200 mm, the construction difficulty is increased, and the construction efficiency is reduced.

[0020] The support assembly 8 is arranged between the top plate and the bottom plate 811 of the box girder 2, so that the top plate load is transmitted to the bottom plate 811 along the support assembly 8, and the top plate and the bottom plate 811 achieve a synergistic stress effect; the adjusting pull rod 84 is connected to the intermediate tension sleeve 85 through screw connection, the length of the two fixed pull rods is adjusted, and the length of the adjusting pull rod 84 is changed at the same time, so that the connecting seat 81 slides along the center line direction of the lower support 7 through the base plate 815, and then drives the first struts 82 on both sides to be tightened in the center line direction, so that the kinetic energy is transmitted, and the upper support 6 and the lower support 7 are in a tight state through the deformation adjustment of the first struts 82 and the inclined struts 83, and the upper support 6, the lower support 7 and the support assembly 8 cooperate to form a truss system, so that the top plate load is transmitted to the bottom plate 811, and the top plate and the bottom plate 811 achieve a synergistic stress effect, which is flexible and convenient to use, and the tight state can be adjusted according to the actual situation; the "W" shaped support structure is formed through a plurality of connecting rod modes, the load transmission is stable, the vibration resistance is high, and long-term use and stress resistance can be realized.

[0021] As shown in Figure 2 In the embodiment, the middle part of the lower surface of the upper support 6 is provided with two groups of first ear plates 61, and each first ear plate 61 is provided with a second ear plate 62 on both sides; the support assembly 8 includes two connecting seats 81, two first struts 82, two inclined struts 83 and an adjusting pull rod 84, each connecting seat 81 is detachably connected with the corresponding connecting hole 71, one end of each first strut 82 is hingedly connected with the corresponding second ear plate 62, the other end of each first strut 82 is hingedly connected with the corresponding connecting seat 81, one end of each inclined strut 83 is hingedly connected with the first ear plate 61, and the other end of each inclined strut 83 is hingedly connected with the corresponding connecting seat 81, and the end of the adjusting pull rod 84 is hingedly connected with the corresponding connecting seat 81, and the middle part of the adjusting pull rod 84 is provided with a tension sleeve 85 for adjusting the length.

[0022] Specifically, the first struts 82 and the inclined struts 83 cooperate to form a "W" shaped web structure, and the W shaped support can yield in tension and compression under the action of vibration, and the hysteresis loop is full; the hinged nodes allow the end of the first struts 82 and the inclined struts 83 to rotate freely, avoid the overall instability caused by the support buckling, and ensure that the vertical bearing capacity does not decrease.

[0023] As shown in Figures 3 to 5As shown, in the embodiment, the upper portion of the lower support 7 is provided with a mounting plate 72, and a plurality of connecting holes 71 are symmetrically arranged on the mounting plate 72; the connecting seat 81 comprises a bottom plate 811, a connecting lug plate 812, a connecting pin shaft 813, a pressing plate 814 and two gaskets 815, the bottom plate 811 is above the mounting plate 72, the connecting lug plate 812 is arranged at the middle portion of the bottom plate 811, the connecting pin shaft 813 penetrates the middle portion of the connecting lug plate 812, the ends of the connecting pin shaft 813 are respectively hinged with the first supporting rod 82 and the inclined supporting rod 83, the pressing plate 814 is arranged below the mounting plate 72, the pressing plate 814 is detachably connected with the bottom plate 811 through a fixing bolt 816, one of the gaskets 815 is arranged between the bottom plate 811 and the mounting plate 72, and the other gasket 815 is arranged between the pressing plate 814 and the mounting plate 72.

[0024] In the embodiment, the gasket 815 is made of polytetrafluoroethylene.

[0025] Specifically, polytetrafluoroethylene has lubricity, and the relative movement between the connecting seat 81 and the mounting plate 72 can be driven when the tightening state is adjusted.

[0026] In the embodiment, the adjusting pull rod 84 is provided with two fixed pull rods, and the end of each fixed pull rod is provided with a threaded segment threadedly matched with the tension sleeve 85.

[0027] In the embodiment, the length of the first supporting rod 82 is greater than the distance between the lower surface of the lower support 7 and the upper surface of the lower support 7.

[0028] Specifically, the length of the first supporting rod 82 is 2-5 mm longer than the distance between the lower surface of the lower support 7 and the upper surface of the lower support 7.

[0029] In the embodiment, the angle between the first supporting rod 82 and the inclined supporting rod 83 connected to the same connecting seat 81 ranges from 43 to 47 degrees.

[0030] As shown, Figures 1 to 5 In the embodiment, the construction method comprises the following steps: S1, the upper support 6 and the lower support 7 are prefabricated and processed in the factory, the fixed base 5 is prefabricated at the bottom of the supporting cavity, and the anchor plate 3 and the canopy leg 1 are connected and fixed at the upper portion of the supporting cavity through the locking member 4; S2, the upper portion of the upper support 6 is welded and fixed with the anchor plate 3, and the lower portion of the lower support 7 is put into the groove and aligned with the upper support 6; S3, the lower support 7 is fixed by filling concrete in the groove; S4, each connecting seat 81 is connected with the corresponding connecting hole 71 and is fastened by a fixing bolt 816; S5, the distance between the upper support 6 and the lower support 7 is measured and recorded as H, and the length of the first support rod 82 and the inclined support rod 83 is preliminarily determined; S6, the first support rod 82 located on both sides and the adjusting pull rod 84 between the two connecting seats 81 are installed, the tensioning sleeve 85 is adjusted to move the two connecting seats 81 to the center line direction of the lower support 7, and the two first support rods 82 are in a preliminary fastening state; S7, the inclined support rod 83 located in the middle is installed, the inclined support rod 83 cooperates with the first support rod 82 to form a “W” shaped web member, the tensioning sleeve 85 is adjusted again to move the two connecting seats 81 to the center line direction of the lower support 7, and the multiple first support rods 82 and the multiple inclined support rods 83 are finally fastened.

[0031] In the embodiment, in step S3, the fixed base 5 is C30 concrete, and the concrete filled in the groove is C40 concrete.

[0032] In the embodiment, in step S2, the distance between the upper support 6 and the lower support 7 is controlled between 200mm to 300mm.

[0033] Specifically, if the distance between the upper support 6 and the lower support 7 is greater than 300mm, the load borne by the support assembly 8 is increased, and the stability of the support assembly 8 is weakened; if the distance between the upper support 6 and the lower support 7 is less than 200mm, the construction difficulty is increased, and the construction efficiency is reduced.

[0034] Although the embodiments of the present application are described in actual schemes, but do not constitute a limitation on the meaning of the present application, for those skilled in the art, according to the modification of the embodiments and the combination with other schemes according to the present application are obvious.

Claims

1. A top force-sharing system for an existing concrete box girder, comprising a canopy leg (1) and a box girder (2), the canopy leg (1) being fixedly connected to the upper surface of the box girder (2), and a support cavity being formed in the box girder (2), characterized in that, Also include: The anchor plate (3) is arranged on the upper surface of the support cavity, and the anchor plate (3) is fixedly connected with the rain shed support (1) through a plurality of locking members (4); The fixed base (5) is fixedly connected to the lower surface of the support cavity, and the middle part of the fixed base (5) is formed with a groove; The upper support member (6) is fixedly connected with the anchor plate (3) at the upper part thereof; The lower support member (7) is fixedly connected with the groove, and the upper surface of the lower support member (7) is formed with a plurality of connecting holes (71); Two groups of support assemblies (8) are symmetrically arranged between the upper support member (6) and the lower support member (7), and are used for transmitting load.

2. The system according to claim 1, wherein: The middle part of the lower surface of the upper support member (6) is provided with two groups of first ear plates (61), and the two sides of each first ear plate (61) are provided with second ear plates (62); The support assembly (8) comprises two connecting seats (81), two first struts (82), two inclined struts (83) and an adjusting pull rod (84), each connecting seat (81) is detachably connected with the corresponding connecting hole (71), one end of each first strut (82) is hingedly connected with the corresponding second ear plate (62), the other end of each first strut (82) is hingedly connected with the corresponding connecting seat (81), one end of each inclined strut (83) is hingedly connected with the first ear plate (61), the other end of each inclined strut (83) is hingedly connected with the corresponding connecting seat (81), and the end of the adjusting pull rod (84) is hingedly connected with the corresponding connecting seat (81). The middle part of the adjusting pull rod (84) is provided with a tension sleeve (85) for adjusting the length.

3. The system according to claim 2, wherein: The upper part of the lower support member (7) is provided with a mounting plate (72), and a plurality of connecting holes (71) are symmetrically arranged on the mounting plate (72); The connecting seat (81) comprises a bottom plate (811), a connecting ear plate (812), a connecting pin shaft (813), a pressing plate (814) and two gaskets (815), the bottom plate (811) is above the mounting plate (72), the connecting ear plate (812) is arranged in the middle of the bottom plate (811), the connecting pin shaft (813) penetrates the middle of the connecting ear plate (812), the ends of the connecting pin shaft (813) are hingedly connected with the first struts (82) and the inclined struts (83) respectively, the pressing plate (814) is arranged below the mounting plate (72), the pressing plate (814) is detachably connected with the bottom plate (811) through a fixing bolt (816), one of the gaskets (815) is arranged between the bottom plate (811) and the mounting plate (72), and the other gasket (815) is arranged between the pressing plate (814) and the mounting plate (72).

4. The system according to claim 3, wherein: The gasket (815) is made of polytetrafluoroethylene material.

5. The system of claim 2, wherein: The adjusting pull rod (84) is provided with two fixed pull rods, and the end of each fixed pull rod is provided with a threaded segment which is threadedly connected with the tension sleeve (85).

6. The system of claim 2, wherein: The length of the first brace (82) is greater than the distance between the lower surface of the lower support (7) and the upper surface of the lower support (7).

7. The system of claim 2, wherein: The angle between the first brace (82) and the inclined brace (83) connected to the same connecting seat (81) ranges from 43 to 47 degrees.

8. A construction method of the top collaborative force system of the existing concrete box girder according to any one of claims 1-7, characterized in that, The construction method comprises the following steps: S1, the upper support (6) and the lower support (7) are prefabricated and processed in the factory, the fixed base (5) is prefabricated at the bottom of the support cavity, and the anchor plate (3) and the canopy foot (1) are connected and fixed through the locking piece (4) at the upper part of the support cavity; S2, the upper part of the upper support (6) is welded and fixed with the anchor plate (3), and the lower part of the lower support (7) is put into the groove and aligned with the upper support (6); S3, fill the concrete in the groove to fix the lower support (7); S4, each connecting seat (81) is connected with the corresponding connecting hole (71) and is tightly clamped through the fixing bolt (816); S5, measure the distance between the upper support (6) and the lower support (7), and record it as H, and preliminarily determine the length of the first brace (82) and the inclined brace (83); S6, install the first brace (82) located on both sides and the adjusting pull rod (84) between the two connecting seats (81), adjust the tension sleeve (85) to move the two connecting seats (81) to the center line direction of the lower support (7), and the two first braces (82) are in a preliminary clamping state; S7, install the inclined brace (83) located in the middle, the inclined brace (83) cooperates with the first brace (82) to form a "W" shaped web member, and the tension sleeve (85) is adjusted again to move the two connecting seats (81) to the center line direction of the lower support (7), and the multiple first braces (82) and the multiple inclined braces (83) are finally clamped.

9. The method of construction according to claim 8, wherein: In step S3, the fixed base (5) is C30 concrete, and the concrete filled into the groove is C40 concrete.

10. The method of construction of claim 8, wherein: In step S2, the distance between the upper support (6) and the lower support (7) is controlled between 200mm to 300mm.

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