Cable-stayed large-span cantilever steel platform system and construction method

Abstract

The cable-stayed large-span cantilever steel platform system and construction method belong to the field of cantilever structure construction of buildings, and the system is used for supporting a large-span concrete structure, a cable-stayed triangular system is formed by using a steel main beam and a cable-stayed rod, the stability of the triangular system is increased by connecting the steel main beams through connecting beams, and a secondary beam is laid on the steel main beam, so that a steel platform is formed. The cable-stayed rod can transmit the stress of the cantilever beam to the closed outer wall to form a stable support system, which can effectively bear the weight and load of the concrete structure. The cable-stayed triangular system is adopted to transmit the load, the performance of the material can be fully utilized, the total steel consumption is reduced, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of construction of cantilever structure of building, and particularly relates to a cable-stayed large-span cantilever steel platform system and a construction method. BACKGROUND

[0002] With the development of economy, various buildings with peculiar shapes are springing up like mushrooms. In order to improve the living comfort, most buildings are provided with large cantilever balcony plates. The construction of the cantilever balcony plates with large span is one of the difficulties of such projects, but the platform is usually set up by using external scaffolding.

[0003] CN107023154A discloses a new cantilever scaffold member and a construction method thereof. The cantilever scaffold member comprises a I-beam cantilever frame, the I-beam cantilever frame is connected with a floor slab through a U-shaped hoop, and a cable-stayed rod assembly is connected to the I-beam cantilever frame. The cable-stayed rod assembly comprises a cable-stayed rod, the end of the cable-stayed rod is provided with a coarse screw thread, a sleeve pipe is embedded on the coarse screw thread, and an adjusting nut is arranged on the sleeve pipe. When the cantilever scaffold is installed, the I-beam cantilever frame needs to be installed first, and then the cable-stayed rod is installed. When the upper end of the cable-stayed rod of the cantilever frame is fixed, it needs to pass through the floor slab. Therefore, the cantilever frame cannot be installed after the I-beam cantilever frame and the cable-stayed rod are connected as a whole. For a closed outer wall, due to the obstruction of the outer wall, it is difficult for the installer to reach the end of the I-beam cantilever frame through the inside of the floor slab with the I-beam cantilever frame to connect the I-beam cantilever frame and the cable-stayed rod. Therefore, the cantilever scaffold cannot be applied to the closed outer wall.

[0004] In addition, with the increase of the span of the large-span cantilever concrete structure, the load of the large-span cantilever concrete structure also increases. In order to cope with the increase of the load, the cross-sectional size, length and connection mode of each component of the cantilever scaffold are usually increased. The above-mentioned new cantilever scaffold connects the cable-stayed rod I-beam through the hole on the I-beam, and the connecting steel beam does not take reinforcing measures after the hole is opened, which limits the bearing capacity of the connecting joint. Therefore, the cantilever scaffold cannot be applied to support the large-span concrete structure. SUMMARY

[0005] The present application aims to provide a cable-stayed large-span cantilever steel platform system and a construction method, so as to solve the technical problem that the common cantilever scaffold cannot be used to support the large-span concrete structure.

[0006] To this end, the present application provides a cable-stayed large-span cantilever steel platform system, which is used to support a large-span concrete structure. The system comprises:

[0007] a steel main beam, which is a plurality of cantilever beams connected perpendicularly to an outer wall;

[0008] a connecting beam, which is horizontally connected between two adjacent steel main beams;

[0009] A diagonal pull rod, the bottom of which is connected with the waist of the steel main beam, and the top of which is connected with the outer wall, and the diagonal pull rod and the steel main beam form a diagonal pull triangle system.

[0010] A secondary beam, which is laid between the tops of the steel main beams.

[0011] Preferably, the top of the diagonal pull rod is connected with an upper base, and the upper base is connected with the outer wall through a pull bolt.

[0012] Preferably, the diagonal pull rod comprises:

[0013] A pull rod;

[0014] A diagonal pull rod upper lug, which is welded at the top of the pull rod, and the diagonal pull rod upper lug is connected with the upper base through a pin shaft;

[0015] A diagonal pull rod lower lug, which is welded at the bottom of the pull rod, and the diagonal pull rod lower lug is connected with the waist of the steel main beam.

[0016] Preferably, the waist position of the top of the steel main beam is connected with a diagonal pull rod connecting base, and the bottom of the diagonal pull rod is connected with the diagonal pull rod connecting base.

[0017] Preferably, the tie beam comprises a first tie beam and a second tie beam, the first tie beam is connected between the waists of two adjacent steel main beams at a diagonal pull rod bottom node, and the second tie beam is connected in a broken line shape between the waists and the roots of two adjacent steel main beams.

[0018] Preferably, a climbing cone is pre-buried in the outer wall at the end position of the steel main beam, and the end of the steel main beam is connected with the climbing cone.

[0019] Preferably, the two ends of the steel main beam are respectively connected with an end lifting ring and a root lifting ring.

[0020] Preferably, the secondary beam and the steel main beam are connected through a U-shaped bolt.

[0021] In addition, the present application also provides a construction method of the above-mentioned diagonal pull type large-span cantilever steel platform system, comprising the following steps:

[0022] S1, pre-buried steel main beam connecting pieces in the outer wall, and install diagonal pull rod top connecting pieces;

[0023] S2. Overall hoisting of the main steel beam and diagonal tie rod: First, install the lifting beam, then connect the bottom of the diagonal tie rod to the waist of the main steel beam. Use a hand-operated hoist to connect the top of the diagonal tie rod to the lifting ring at the root of the main steel beam. After passing one end of the first wire rope through the lifting ring at the end of the main steel beam, use a wire rope clip to connect the end of the first wire rope to the lifting ring at the root. Hook the hook at the other end of the first wire rope to the bottom of the lifting beam. Use the second wire rope to connect the top of the diagonal tie rod to the bottom of the lifting beam, lift the lifting beam, and thus hoist the main steel beam and diagonal tie rod as a whole.

[0024] S3. After hoisting the steel main beam to the installation position, first use the top connector of the diagonal tie rod to connect the top of the diagonal tie rod to the outer wall. Then, adjust the position of the steel main beam by adjusting the hand chain hoist so that the steel main beam can be connected to the outer wall through the steel main beam connector.

[0025] S4. Dismantle the hand chain hoist, the first wire rope, and the second wire rope;

[0026] S5. Install the first and second connecting beams;

[0027] S6. Install the secondary beam.

[0028] Preferably, in step S4, the construction worker stands at the base of the steel main beam to remove the hand-operated hoist and the second wire rope; disconnecting the connection between the wire rope clip and the base lifting ring allows the first wire rope to be removed.

[0029] Compared with the prior art, the features and beneficial effects of the present invention are as follows:

[0030] (1) This invention utilizes steel main beams and diagonal tie rods to form a diagonal triangular system. The main steel beams are connected by connecting beams to increase the stability of the triangular system. Secondary beams are laid on the main steel beams to form a steel platform. The diagonal tie rods can transfer the force of the cantilever beams to the enclosed exterior wall, forming a stable support system that can effectively bear the weight and load of the concrete structure. This invention uses a diagonal triangular system to transfer loads, which can make full use of the material properties, reduce the overall steel consumption, and save costs.

[0031] (2) The connection point between the diagonal tie rod and the main steel beam of this invention is located at the waist of the steel beam. Compared with the method of setting the connection point at the end of the steel beam, the maximum positive bending moment of the steel beam is smaller, which makes full use of the performance of steel and makes the load-bearing capacity of the steel beam with the same cross-section higher. The diagonal tie rod also adopts the form of combined double tie rod, which can withstand greater tensile force. The ear plate of the diagonal tie rod is connected to the diagonal tie rod connecting base welded to the steel beam, and the steel beam at the base is reinforced with ribs, which increases the load-bearing capacity of the connection node. The secondary beam and the main beam of this invention are connected by U-bolts, which increases the lateral stability of the steel beam and the stability of the entire steel platform. The diagonal-stayed large-span cantilever steel platform system of this invention has a large load-bearing capacity and a large cantilever span, and can be used to support large-span concrete structures.

[0032] (3) The present invention adopts unit-type overall hoisting during installation. The steel main beam and diagonal tie rod form a diagonal triangular system. Each diagonal triangular system is a unit. When hoisting a single diagonal triangular system, the installer only needs to stand near the wall to fix the steel beam and diagonal tie rod. The installer can remove the wire rope at the root of the steel beam without having to operate at the far end of the steel beam. For non-enclosed exterior wall floors, a temporary platform can be set up on the floor for installation. However, this method is difficult to achieve for enclosed exterior walls.

[0033] (4) For general exterior walls, the steel main beam opening is usually reserved in the cantilevered exterior wall first. Then, the steel main beam is placed on the floor slab through the reserved opening and fixedly connected to the floor slab. Finally, the end of the cantilevered steel beam is connected to the embedded parts on the upper floor slab by steel wire rope. This method is not suitable for closed exterior walls that cannot have large openings. To avoid opening large openings in the wall, the steel main beam and diagonal tie rod can only be fixed to the exterior wall by embedding parts in the exterior wall. This method makes it difficult to install the steel main beam and diagonal tie rod separately. If the steel main beam is installed first, it is difficult for a single steel main beam to form a stable system. It will be extremely dangerous for installers to install diagonal tie rods on a single steel main beam. When hoisting steel beams, a two-point lifting method is generally used, with the lifting points set at the base and end of the steel beam. The base of the steel beam is usually close to the building, making it easier to remove the hoisting wire ropes. However, the wire ropes at the end of the steel beam require a temporary platform to be erected for removal. This invention uses a lifting ring at the end of the steel beam to transfer the fixing point of the end wire rope to the base of the steel beam, enabling the removal of all hoisting wire ropes at the base of the steel beam.

[0034] (5) The inclined-stayed large-span cantilever steel platform system of the present invention is installed by hoisting the main steel beam and the inclined tie rod as a whole. The overall hoisting can install the main steel beam and the inclined tie rod together to form a complete support system, which improves the stability and load-bearing capacity of the entire system. Secondly, by using equipment such as hoisting beams and wire ropes, the main steel beam and the inclined tie rod can be hoisted into place at one time, avoiding the process of installing section by section and saving construction time. Compared with the general method of hoisting the main steel beam and the inclined tie rod separately, the overall hoisting scheme of the present invention not only saves time and labor, but also improves the safety of the large-span cantilever steel platform. On the one hand, the overall hoisting allows the main steel beam and the inclined tie rod to form the main force system in advance, and the load-bearing capacity is guaranteed when installing the steel beam; on the other hand, all hoisting wire ropes can be removed from the base of the steel beam, which greatly reduces the risk of installation personnel falling from height.

[0035] (6) The cable-stayed large-span cantilever steel platform system of the present invention does not require welding during installation, and is easy to dismantle and reuse. Attached Figure Description

[0036] Figure 1This is a schematic diagram of a cable-stayed, large-span cantilevered steel platform system (secondary beams omitted).

[0037] Figure 2 This is a side view of a cable-stayed, large-span cantilevered steel platform system.

[0038] Figure 3 This is a schematic diagram showing the connection between the steel main beam and the enclosed exterior wall.

[0039] Figure 4 This is a schematic diagram showing the connection between the tie rod and the enclosed exterior wall;

[0040] Figure 5 This is a schematic diagram of the steel main beam;

[0041] Figure 6 This is a schematic diagram of a tie rod;

[0042] Figure 7 This is a schematic diagram showing the connection between the tie rod and the upper base;

[0043] Figure 8 This is a schematic diagram showing the connection between the tie rod and the main steel beam;

[0044] Figure 9 This is a schematic diagram of the hoisting of a cable-stayed, large-span cantilevered steel platform system.

[0045] Attached diagram labels: 1. Main steel beam; 101. End lifting ring; 102. H-beam; 103. Diagonal tie rod connecting base; 104. Connecting ear plate; 105. Root lifting ring; 2. Secondary beam; 3. Diagonal tie rod; 301. Upper ear plate of diagonal tie rod; 302. Tie rod; 303. Lower ear plate of diagonal tie rod; 41. First connecting beam; 42. Second connecting beam; 5. Climbing cone; 6. Upper base; 7. Tie bolt; 8. U-bolt; 9. Enclosed outer wall; 10. Pin shaft; 11. First wire rope; 12. Lifting beam; 13. Wire rope clip; 14. Hand-operated hoist; 15. Second wire rope. Detailed Implementation

[0046] To make the technical means, innovative features, objectives and effects of this invention easier to understand, the invention will be further described below.

[0047] The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the invention, and are illustrative and exemplary, and should not be construed as limiting the implementation or scope of the invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0048] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] like Figure 1 and Figure 2 The diagram shows a cable-stayed, large-span cantilevered steel platform system used to support large-span concrete structures. The system includes main steel beams (1), connecting beams, diagonal braces (3), and secondary beams (2). The main steel beams (1) are multiple cantilever beams vertically connected to a closed outer wall (9). The closed outer wall (9) is a concrete wall. Connecting beams are horizontally connected between adjacent main steel beams (1), ensuring the stability of the entire system. The bottom of the diagonal braces (3) is connected to the waist of the main steel beams (1), and the top of the diagonal braces (3) is connected to the closed outer wall (9), forming a diagonal triangular system with the main steel beams (1). Secondary beams (2) are laid between the tops of the main steel beams (1). Preferably, the secondary beams (2) are connected to the main steel beams (1) by U-bolts (8). This invention utilizes a steel main beam (1) and diagonal tie rods (3) to form a diagonal triangular system. The steel main beams (1) are connected by connecting beams to increase the stability of the triangular system. Secondary beams (2) are laid on the steel main beams (1) to form a steel platform. The diagonal tie rods (3) can transfer the force of the steel main beams (1) to the closed outer wall (9) to form a stable support system that can effectively bear the weight and load of the concrete structure.

[0051] like Figure 5 As shown, the main steel beam (1) includes an H-beam (102), and a diagonal tie rod connecting base (103) is connected to the top waist position. The bottom of the diagonal tie rod (3) is connected to the diagonal tie rod connecting base (103) through a pin (10), as shown. Figure 8As shown. The two ends of the steel main beam (1) are respectively connected to end lifting rings (101) and root lifting rings (105).

[0052] like Figure 3 As shown, in one specific embodiment, climbing cones (5) are pre-embedded in the closed outer wall (9) at the end of the steel main beam (1), and the end of the steel main beam (1) is connected to the climbing cones (5). There are no fewer than two climbing cones (5) at the end of each steel main beam (1). Figure 4 As shown, the top of the diagonal tie rod (3) is connected to an upper base (6), which is connected to the enclosed outer wall (9) by tie bolts (7). The number of tie bolts (7) at the end of each diagonal tie rod (3) is not less than 4. The nuts of the tie bolts (7) should preferably be double nuts.

[0053] like Figure 6 As shown, the tie rod (3) includes a tie rod (302), an upper ear plate (301), and a lower ear plate (303). The upper ear plate (301) is welded to the top of the tie rod (302), and the upper ear plate (301) is connected to the upper base (6) via a pin (10). Figure 7 As shown. The lower ear plate (303) of the diagonal tie rod is welded to the bottom of the tie rod (302), and the lower ear plate (303) of the diagonal tie rod is connected to the waist of the steel main beam (1). Preferably, there are no fewer than two tie rods (302), in which case the top of the tie rod (302) is welded to both sides of the upper ear plate (301) of the diagonal tie rod, and the bottom of the tie rod (302) is welded to both sides of the lower ear plate (303) of the diagonal tie rod.

[0054] like Figure 1 and Figure 3 As shown, the connecting beam includes a first connecting beam (41) and a second connecting beam (42). The first connecting beam (41) is connected between the waist of two adjacent steel main beams (1) at the bottom node of the tie rod (3). The second connecting beam (42) is connected in a zigzag shape between the waist and root of two adjacent steel main beams (1).

[0055] The construction method for the above-mentioned cable-stayed, large-span cantilevered steel platform system includes the following steps:

[0056] S1. Embed steel main beam connectors and diagonal tie rod top connectors in the enclosed outer wall (9). Specifically, the steel main beam connector is a climbing cone (5), and the diagonal tie rod top connector includes tie bolts (7) and an upper base (6). After the tie bolts (7) are embedded, the upper base (6) is fastened to the enclosed outer wall (9) by the tie bolts (7).

[0057] S2, integral hoisting of the main steel beam (1) and diagonal tie rod (3): as follows Figure 9As shown, first install the lifting beam (12), then connect the lower ear plate (303) of the diagonal tie rod (3) at the bottom to the diagonal tie rod connecting base (103) at the waist of the steel main beam (1) through the pin (10), and use the hand chain hoist (14) to connect the upper ear plate (301) of the diagonal tie rod at the top of the diagonal tie rod (3) to the root lifting ring (105) of the steel main beam (1). After passing one end of the first wire rope (11) through the end lifting ring (101) of the steel main beam (1), connect the end of the first wire rope (11) to the root lifting ring (105) with the wire rope buckle (13), and hook the hook of the other end of the first wire rope (11) to the bottom of the lifting beam (12). Use the second wire rope (15) to connect the upper ear plate (301) of the diagonal tie rod at the top of the diagonal tie rod (3) to the bottom of the lifting beam (12). The lifting beam (12) is lifted, thereby hoisting the steel main beam (1) and the diagonal tie rod (3) as a whole.

[0058] S3. After hoisting the steel main beam (1) to the installation position, first use the top connector of the diagonal brace to connect the top of the diagonal brace (3) to the closed outer wall (9). Specifically, use the pin (10) to connect the upper ear plate (301) of the diagonal brace to the upper base (6). Then adjust the position of the steel main beam (1) by adjusting the hand hoist (14) so ​​that the steel main beam (1) can be connected to the closed outer wall (9) through the steel main beam connector. Specifically, the bolt holes of the end plate of the steel main beam (1) are aligned with the climbing cone (5). When installing the steel main beam (1), connect the load-bearing bolt of the climbing cone (5) to the bolt holes of the end plate of the steel main beam (1).

[0059] S4. Remove the hand chain hoist (14), the first wire rope (11), and the second wire rope (15). Specifically, the construction workers stand at the base of the main steel beam (1) to remove the hand chain hoist (14) and the second wire rope (15). Since the first connecting beam (41) and the second connecting beam (42) have not yet been installed, it is too dangerous for the construction workers to stand at the end of the main steel beam (1) to remove the hook. In this invention, the first wire rope (11) can be removed by disconnecting the connection between the wire rope clip (13) and the base lifting ring (105).

[0060] S5. Install the first connecting beam (41) and the second connecting beam (42). Specifically, both ends of the first connecting beam (41) and the second connecting beam (42) are provided with bolt holes. The bolts are used to connect the two ends of the first connecting beam (41) and the second connecting beam (42) to the connecting lugs (104) on the steel main beam (1).

[0061] S6. Install the secondary beam (2). Specifically, lay the secondary beam (2) on the main steel beam (1) and connect the main steel beam (1) and the secondary beam (2) using U-bolts (8).

[0062] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A construction method of a cable-stayed large-span cantilever steel platform system, characterized by, The system is used for supporting large-span concrete structure, and the system comprises: a steel main beam (1) which is a plurality of cantilever beams connected perpendicularly with a closed outer wall (9); a connecting beam which is horizontally connected between two adjacent steel main beams (1); a diagonal pull rod (3) which is connected at the bottom with the waist of the steel main beam (1) and at the top with the closed outer wall (9), and which forms a diagonal pull triangle system with the steel main beam (1); a secondary beam (2) which is laid between the top of the steel main beam (1); the two ends of the steel main beam (1) are respectively connected with an end lifting ring (101) and a root lifting ring (105); the connecting beam comprises a first connecting beam (41) and a second connecting beam (42), the first connecting beam (41) is connected between the waists of two adjacent steel main beams (1) at the bottom node of the diagonal pull rod (3), and the second connecting beam (42) is connected in a broken line shape between the waists and the roots of two adjacent steel main beams (1); specifically comprising the following steps: S1, embedding a steel main beam connecting piece in the closed outer wall (9) and installing a diagonal pull rod top connecting piece; S2, hoisting the steel main beam (1) and the diagonal pull rod (3) as a whole: first, installing a lifting beam (12), then connecting the bottom of the diagonal pull rod (3) with the waist of the steel main beam (1), connecting the top of the diagonal pull rod (3) with the root lifting ring (105) of the steel main beam (1) by using a hand-operated hoist (14), connecting the end of the first steel wire rope (11) with the root lifting ring (105) by using a steel wire rope buckle (13) after the end of the first steel wire rope (11) passes through the end lifting ring (101) of the steel main beam (1), hooking the bottom of the lifting beam (12) by the hook part of the other end of the first steel wire rope (11), connecting the top of the diagonal pull rod (3) with the bottom of the lifting beam (12) by using a second steel wire rope (15), and hoisting the lifting beam (12) to hoist the steel main beam (1) and the diagonal pull rod (3) as a whole; S3, after hoisting the steel main beam (1) to the position to be installed, connecting the top of the diagonal pull rod (3) with the closed outer wall (9) by using the diagonal pull rod top connecting piece, and then adjusting the position of the steel main beam (1) by adjusting the hand-operated hoist (14) so that the steel main beam (1) can be connected with the closed outer wall (9) through the steel main beam connecting piece; S4, removing the hand-operated hoist (14), the first steel wire rope (11) and the second steel wire rope (15); S5, installing the first connecting beam (41) and the second connecting beam (42); S6, installing the secondary beam (2).

2. The construction method of the cable-stayed large-span cantilever steel platform system according to claim 1, characterized in that, The top of the diagonal pull rod (3) is connected with an upper base (6), and the upper base (6) is connected with the closed outer wall (9) by using a tension bolt (7).

3. The construction method of the cable-stayed large-span cantilever steel platform system according to claim 2, characterized in that, The diagonal pull rod (3) comprises: a pull rod (302); a diagonal pull rod upper ear plate (301) which is welded at the top of the pull rod (302) and connected with the upper base (6) by using a pin shaft; a diagonal pull rod lower ear plate (303) which is welded at the bottom of the pull rod (302) and connected with the waist of the steel main beam (1).

4. The construction method of the cable-stayed large-span cantilever steel platform system according to claim 1, characterized in that, The oblique pull rod connecting base (103) is connected to the waist position of the top of the steel girder (1), and the bottom of the oblique pull rod (3) is connected to the oblique pull rod connecting base (103).

5. The construction method of the cable-stayed large-span cantilever steel platform system according to claim 1, characterized in that, The climbing cone (5) is embedded in the closed outer wall (9) at the end position of the steel girder (1), and the end of the steel girder (1) is connected to the climbing cone (5).

6. The construction method of cable-stayed large-span cantilever steel platform system according to claim 1, characterized in that, The secondary girder (2) is connected to the steel girder (1) through the U-shaped bolt (8).

7. The construction method of cable-stayed large-span cantilever steel platform system according to claim 1, characterized in that, In S4, the construction personnel stand at the root of the steel girder (1) to remove the hand-operated hoist (14) and the second steel wire rope (15); the connection between the steel wire rope buckle (13) and the root lifting ring (105) is disconnected, and the first steel wire rope (11) can be removed.

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