Large steel bracket on concrete structure and construction method thereof

Abstract

The present invention discloses a large steel corbel on a concrete structure and a construction method thereof, comprising: an embedded device, which comprises an embedded steel box and a plurality of pressure transmission components; the embedded steel box is composed of a plurality of narrow steel boxes with one side opening fixedly connected in sequence, and the upper and lower planes and two mutually parallel side surfaces of the embedded steel box are fixedly connected with a plurality of the pressure transmission components; a shear device, which comprises a plurality of webs with I-shaped cross-sections, one end of each web can be correspondingly inserted into one of the narrow steel boxes, and the upper and lower planes of the web not inserted into the narrow steel box are respectively fixedly connected with supporting steel plates. The present invention has a simple installation and construction process, a fast construction speed, can effectively shorten the construction period, and the construction process has basically no damage to the main concrete structure.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction facilities, and more specifically, to a large steel corbel on a concrete structure and a construction method thereof. Background Art

[0002] In modern large-span bridge structures, cable towers are important load-bearing components and are key components for transmitting the force of tension (suspension) cables to the foundation. The cable towers used are H-shaped towers or portal towers. The construction of the beams (especially the upper beams) on such cable towers often adopts the form of brackets. Concrete bridge towers need to withstand huge shear forces, and steel structure brackets that can withstand huge loads need to be installed on the bridge towers.

[0003] Conventional pre-buried anchor bars + pre-buried anchor plates cannot meet the requirements due to limited force; if large-diameter steel bars or pre-buried large steel structure boxes are used, the main bars need to be cut, affecting the safety and reliability of the main structure. Therefore, it is necessary to design a steel bracket with large bearing capacity, easy construction and basically no damage to the concrete main structure as a supporting structure for the upper construction structure. Summary of the invention

[0004] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0005] In order to achieve these purposes and other advantages according to the present invention, a large steel corbel on a concrete structure is provided, characterized in that it comprises:

[0006] The embedded device comprises an embedded steel box and a plurality of pressure transmission components; the embedded steel box is composed of a plurality of narrow steel boxes with one side opening and fixedly connected in sequence, and the upper and lower planes and two mutually parallel side surfaces of the embedded steel box are fixedly connected with a plurality of the pressure transmission components;

[0007] The shear resistance device comprises a plurality of webs with I-shaped cross-sections, one end of each web can be correspondingly inserted into one of the narrow steel boxes, and the upper and lower planes of the web not inserted into the narrow steel box are respectively fixedly connected with supporting steel plates.

[0008] Preferably, a pressure diffusion plate is fixedly connected to the lower plane of the embedded steel box, a plurality of pressure transmission components are fixedly connected to the lower plane of the pressure diffusion plate, and the number of pressure transmission components fixedly connected to the lower plane of the pressure diffusion plate is greater than the number of pressure transmission components fixedly connected to the upper plane of the embedded steel box.

[0009] Preferably, the plurality of pressure transfer components fixedly connected to two side surfaces of the embedded steel box are symmetrically arranged.

[0010] Preferably, a plurality of connecting steel plates are fixedly connected at equal intervals between two adjacent narrow steel boxes, and the connecting steel plates connected on both sides of any narrow steel box are symmetrically arranged.

[0011] Preferably, there is a gap between the portion of the web inserted into the narrow steel box and the inner wall of the narrow steel box.

[0012] Preferably, a plurality of stiffening plates are arranged between the portions of two adjacent webs that are not inserted into the narrow steel box, and the stiffening plates connected to both sides of any web are symmetrically arranged.

[0013] A construction method for a large steel corbel on a concrete structure, characterized in that it comprises the following steps:

[0014] Step 1: welding the narrow steel box, the pressure transmission member, the connecting steel plate and the pressure diffusion plate to form the embedded device, and welding the web, the supporting steel plate and the stiffening plate to form the shear resistance device;

[0015] Step 2: When pouring the concrete main structure, embed the prefabricated embedded device;

[0016] Step 3: After the concrete pouring is completed, curing is performed. After the embedded device is fully combined with the surrounding concrete structure to reach the connection strength, grouting is poured into the narrow steel box, and at the same time, one end of the shear device is inserted into the narrow steel box;

[0017] Step 4: After the anti-shear device is firmly connected to the narrow steel box, the installation of the steel corbel is completed.

[0018] Preferably, in step 2, when the horizontal space is limited, when pouring the concrete structure, two of the embedded devices can be embedded in the vertical direction, with a certain distance between the two embedded devices, and after the upper and lower embedded devices are fully combined with the surrounding concrete structure to achieve the connection strength, the shear device is installed; after the upper and lower shear devices are firmly connected to the embedded devices respectively, an auxiliary device is installed between the upper and lower shear devices.

[0019] Preferably, the auxiliary device comprises:

[0020] A support frame, comprising an upper bottom plate, a lower bottom plate, side plates and a reinforcing plate; the side plates and the reinforcing plate are perpendicular to each other and are fixedly connected to the upper bottom plate and the lower bottom plate;

[0021] A viscous damper, one end of which is fixed to the upper base plate, and the other end of which is fixed to the bottom surface of the anti-shear device located above;

[0022] A screw, the upper end of which is fixed on the bottom surface of the lower bottom plate;

[0023] A buffer rod, which is a barrel-shaped structure with an open upper end, wherein the inner wall of the buffer rod is provided with a thread matching the screw rod, and the screw rod is threadedly connected to the buffer rod;

[0024] An elastic member, one end of which is fixed to the bottom of the screw rod, and the other end of which is fixed to the inner bottom surface of the buffer rod; the length of the auxiliary device can be adjusted by adjusting the screw rod and the buffer rod.

[0025] The present invention has at least the following beneficial effects:

[0026] 1. The embedded device and the anti-shear device in the present invention can be prefabricated before construction. The embedded device is cast together with the concrete structure. After the embedded device is fully combined with the surrounding concrete structure to reach the connection strength, the anti-shear device is inserted to complete the installation of the steel bracket. The construction process is simple and the construction speed is fast, which can effectively shorten the construction period and cause basically no damage to the main concrete structure.

[0027] 2. The embedded steel box in the embedded device of the present invention is provided with pressure transmission components in the horizontal and vertical directions to ensure the stability of the force of the embedded device, and multiple narrow steel boxes are inserted into multiple webs to withstand shear force, which can effectively increase the load-bearing capacity of the steel corbel.

[0028] 3. When the embedded device in the present invention is poured together with the main concrete structure, no additional holes need to be opened on the template, the template will not be damaged, and the efficiency of module installation and removal will not be affected.

[0029] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A top view of a cross-sectional structure of an embodiment of the present invention;

[0031] Figure 2 It is a front view of the cross-sectional structure of the above embodiment of the present invention;

[0032] Figure 3 It is a right side view of the embedded device described in the above embodiment of the present invention;

[0033] Figure 4 is a top view of the cross-sectional structure of the anti-shear device in the above embodiment of the present invention;

[0034] Figure 5 It is a right side view of the anti-shear device described in the above embodiment of the present invention;

[0035] Figure 6 It is a front view of the auxiliary device described in the above embodiment of the present invention;

[0036] Figure 7 It is a front view of the support frame in the auxiliary device described in the above embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0038] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] like Figure 1 to Figure 7 As shown, the present invention provides a large steel corbel on a concrete structure, characterized in that it includes:

[0040] The embedded device 1 comprises an embedded steel box and a plurality of pressure transmission components 14; the embedded steel box is composed of a plurality of narrow steel boxes 11 with one side opening and fixedly connected in sequence, and the upper and lower planes and two parallel side surfaces of the embedded steel box are fixedly connected with a plurality of the pressure transmission components 14;

[0041] The shear resistance device 2 comprises a plurality of webs 21 with an I-shaped cross section. One end of each web 21 can be correspondingly inserted into one of the narrow steel boxes 11. Support steel plates 22 are fixedly connected to the upper and lower planes of the web portion not inserted into the narrow steel box.

[0042] In this technical solution, a plurality of the pressure transmission components 14 are provided in the horizontal and vertical directions of the embedded steel box to increase the stability of the force on the embedded steel box. The pressure transmission components can be force transmission components such as steel bars and steel plates. The embedded steel box is composed of a plurality of the narrow steel boxes 11. The anti-shear device 2 bears the shear force by correspondingly inserting a plurality of the webs 21 into the narrow steel boxes 11, and shares the shear force through a plurality of the narrow steel boxes 11 and the webs 21 to increase the force-bearing capacity of the steel corbel. The required number of the narrow steel boxes 11 and the webs 21 can also be determined according to the size of the shear force. The cross-sectional shape of the web 21 is an I-shape, which can increase the stability of the web 21 when it is inserted into the narrow steel box 11, and facilitate the downward transmission of the load on the upper end, thereby further ensuring the shear resistance performance of the web 21.

[0043] In another embodiment, a pressure diffusion plate 13 is fixedly connected to the lower plane of the embedded steel box, and a plurality of pressure transmission components 14 are fixedly connected to the lower plane of the pressure diffusion plate 13, and the number of pressure transmission components 14 fixedly connected to the lower plane of the pressure diffusion plate 13 is greater than the number of pressure transmission components 14 fixedly connected to the upper plane of the embedded steel box. The pressure diffusion plate 13 assists in diffusing and transmitting the pressure on the narrow steel box 11 downward, so as to increase the stability of the narrow steel box 11 after being subjected to force.

[0044] In another embodiment, the multiple pressure transmission members 14 fixedly connected to the two sides of the embedded steel box are symmetrically arranged. The pressure transmission members 14 on both sides of the embedded steel box are used to diffuse and transmit the horizontal force of the embedded steel box, and at the same time provide horizontal support to the embedded steel box in the opposite direction.

[0045] In another embodiment, a plurality of connecting steel plates 12 are fixedly connected between two adjacent narrow steel boxes 11 at equal intervals, and the connecting steel plates 12 connected on both sides of any narrow steel box 11 are symmetrically arranged. The connecting steel plates 12 are used to evenly disperse the plurality of narrow steel boxes 11, so as to prevent the embedded steel boxes from being subjected to large shear forces.

[0046] In another embodiment, there is a gap between the portion of the web 21 inserted into the narrow steel box 11 and the inner wall of the narrow steel box 11. When the steel corbel is installed, the web 21 needs to be inserted into the narrow steel box 11 while grouting is being poured into the narrow steel box 11, so that the shearing device 2 is firmly connected to the embedded device 1. The gap between the portion of the web 21 inserted into the narrow steel box 11 and the inner wall of the narrow steel box 11 provides space for grouting.

[0047] In another embodiment, a plurality of stiffening plates 23 are arranged between the portions of two adjacent webs 21 that are not inserted into the narrow steel box 11, and the stiffening plates 23 connected to both sides of any web 21 are symmetrically arranged. The stiffening plates 23 are used to increase the overall strength of the shearing device 2, so as to improve the shearing resistance performance of the shearing device 2.

[0048] A construction method for a large steel corbel on a concrete structure, characterized in that it comprises the following steps:

[0049] Step 1: Weld the narrow steel box 11, the pressure transmission member 14, the connecting steel plate 12 and the pressure diffusion plate 13 to form the embedded device 1, and weld the web 21, the supporting steel plate 22 and the stiffening plate 23 to form the shear resistance device 2;

[0050] Step 2: When pouring the concrete main structure, embed the prefabricated embedded device 1;

[0051] Step 3: After the concrete pouring is completed, curing is performed. After the embedded device 1 is fully combined with the surrounding concrete structure to achieve the connection strength, grouting is poured into the narrow steel box 11, and at the same time, one end of the shear device 2 is inserted into the narrow steel box 11;

[0052] Step 4: After the anti-shear device 2 is firmly connected to the narrow steel box 11, the installation of the steel corbel is completed.

[0053] The embedded device 1 and the anti-shear device 2 are prefabricated before construction, which can effectively shorten the construction period. The embedded device 1 is cast together with the main concrete structure, and the anti-shear device 2 is inserted after the embedded device 1 is fully combined with the surrounding concrete structure to achieve the connection strength, and then the two are firmly connected by grouting to complete the installation of the steel bracket. The construction process is simple, the construction speed is fast, and the construction process does not cause any damage to the main concrete structure.

[0054] In another embodiment, in step 2, when the horizontal space is limited, when pouring the concrete structure, two of the embedded devices 1 can be embedded in the vertical direction, with a certain distance between the two embedded devices 1, and after the upper and lower embedded devices 1 are fully combined with the surrounding concrete structure to reach the connection strength, the shear device is installed; after the upper and lower anti-shear devices 2 are firmly connected to the embedded devices 1 respectively, the auxiliary device 3 is installed between the upper and lower anti-shear devices.

[0055] In this technical solution, when a larger load needs to be borne but the horizontal space is limited and the use of more narrow steel boxes 11 and webs 21 is not allowed, two embedded devices 1 can be embedded in the vertical direction. A certain distance needs to be spaced between the two embedded devices 1. If they are too close, the concrete main structure will be subjected to excessive stress locally, increasing the risk of damage.

[0056] In another embodiment, the auxiliary device 3 comprises:

[0057] The support frame 32 includes an upper bottom plate 321, a lower bottom plate 324, a side plate 322 and a reinforcing plate 323; the side plates 322 and the reinforcing plate 323 are perpendicular to each other and are fixedly connected to the upper bottom plate 321 and the lower bottom plate 324;

[0058] A viscous damper 31, one end of which is fixed on the upper base plate 321, and the other end of which is fixed on the bottom surface of the anti-shear device located above;

[0059] A screw rod 33, the upper end of which is fixed on the bottom surface of the lower bottom plate 324;

[0060] The buffer rod 34 is a barrel-shaped structure with an open upper end. The inner wall of the buffer rod 34 is provided with a thread that matches the screw rod 33. The screw rod 33 is threadedly connected to the buffer rod 34.

[0061] An elastic member 35 has one end fixed to the bottom of the screw rod 33 and the other end fixed to the inner bottom surface of the buffer rod 34 ; the length of the auxiliary device 3 can be adjusted by adjusting the screw rod 33 and the buffer rod 34 .

[0062] The upper end of the auxiliary device 3 is connected to the upper shear device 2 through the viscous damper 31. Since the tower crossbeam is generally set at a higher position, the viscous damper 31 can absorb part of the vibration while transmitting the force from the upper shear device 2 to the lower shear device 2, consume the impact force caused by the vibration, and increase the stability of the structure. The auxiliary device 3 is adjusted in length by rotating the screw 33 and the buffer rod 34, and is tightly connected to the upper and lower shear devices 2. The elastic member 35 provides a certain elastic buffer, so that the auxiliary device 3 is non-rigidly connected to the lower shear device 2, avoiding the generation of instantaneous large pressure when transmitting the force to the lower shear device 2, thereby damaging its structure.

[0063] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A construction method for a large steel bracket on a concrete structure, the large steel bracket comprising: The embedded device includes an embedded steel box and a plurality of pressure transmission components; The embedded steel box is composed of a plurality of narrow steel boxes with one side opening that are fixedly connected in sequence, and the upper and lower planes and two mutually parallel side surfaces of the embedded steel box are fixedly connected with a plurality of the pressure transmission components; the shearing device comprises a plurality of webs with I-shaped cross-sections, one end of each web can be correspondingly inserted into one of the narrow steel boxes, and the upper and lower planes of the webs that are not inserted into the narrow steel box are respectively fixedly connected with supporting steel plates; the lower plane of the embedded steel box is fixedly connected with a pressure diffusion plate, and the lower plane of the pressure diffusion plate is fixedly connected with a plurality of pressure transmission components, and the pressure The number of pressure transmission components fixedly connected to the lower plane of the force diffusion plate is greater than the number of pressure transmission components fixedly connected to the upper plane of the embedded steel box; a plurality of connecting steel plates are fixedly connected at equal intervals between two adjacent narrow steel boxes, and the connecting steel plates connected on both sides of any narrow steel box are symmetrically arranged; there is a gap between the portion of the web inserted into the narrow steel box and the inner wall of the narrow steel box; a plurality of stiffening plates are arranged between the portions of two adjacent webs not inserted into the narrow steel box, and the stiffening plates connected on both sides of any web are symmetrically arranged; it is characterized in that the construction method comprises the following steps: Step 1: welding the narrow steel box, the pressure transmission member, the connecting steel plate and the pressure diffusion plate to form the embedded device, and welding the web, the supporting steel plate and the stiffening plate to form the shear resistance device; Step 2: When pouring the concrete main structure, embed the prefabricated embedded device; Step 3: After the concrete pouring is completed, curing is performed. After the embedded device is fully combined with the surrounding concrete structure to reach the connection strength, grouting is poured into the narrow steel box, and at the same time, one end of the shear device is inserted into the narrow steel box; Step 4: After the anti-shear device is firmly connected to the narrow steel box, the installation of the steel corbel is completed; In step 2, when the horizontal space is limited, when pouring the concrete structure, two embedded devices are embedded in the vertical direction, and a certain distance is spaced between the two embedded devices. After the upper and lower embedded devices are fully combined with the surrounding concrete structure to achieve the connection strength, the shear device is installed; after the upper and lower shear devices are firmly connected to the embedded devices respectively, the auxiliary device is installed between the upper and lower shear devices; The auxiliary device comprises: A support frame, comprising an upper bottom plate, a lower bottom plate, side plates and a reinforcing plate; the side plates and the reinforcing plate are perpendicular to each other and are fixedly connected to the upper bottom plate and the lower bottom plate; A viscous damper, one end of which is fixed to the upper base plate, and the other end of which is fixed to the bottom surface of the anti-shear device located above; A screw, the upper end of which is fixed on the bottom surface of the lower bottom plate; A buffer rod, which is a barrel-shaped structure with an open upper end, wherein the inner wall of the buffer rod is provided with a thread matching the screw rod, and the screw rod is threadedly connected to the buffer rod; An elastic member, one end of which is fixed to the bottom of the screw rod, and the other end of which is fixed to the inner bottom surface of the buffer rod; the length of the auxiliary device can be adjusted by adjusting the screw rod and the buffer rod.

2. The construction method of large steel bracket on concrete structure as claimed in claim 1, characterized in that: The multiple pressure transmission components fixedly connected to the two side surfaces of the embedded steel box are symmetrically arranged.

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