Hoisting construction method for deep earth wall-connecting reinforcement cage

Abstract

The invention discloses a hoisting construction method for a deep earth continuous wall reinforcement cage, which is characterized in that a first hoisting point of a main crane is flexibly added, so that the main weight of the reinforcement cage is still borne by the main crane during horizontal hoisting, the model selection of an auxiliary crane is more flexible, and the cost is saved. Meanwhile, the first lifting points are uniformly distributed at intervals, so that the reinforcement cage can be put down in a multi-time rope rewinding manner, various indexes can be conveniently controlled during cage putting down, the risk that workers hang ropes up and down is reduced, and the rewound ropes and the reinforcement cage are prevented from being wound together in the process. The method solves the problems that main lifting points are few, and a reversed rope is too long to be easily wound with the underground diaphragm wall reinforcement cage in a traditional underground diaphragm wall reinforcement cage lifting method.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a method for hoisting a steel cage for a deep ground-connected wall. Background Art

[0002] With the rapid development of urbanization, the urban rail transit network has been further expanded, and the scale of new underground stations, especially transfer stations, has repeatedly set new records. As an important structure of underground stations, underground continuous walls are also the first part of the construction. The hoisting of steel cages in the construction of ground-connected walls is a dangerous project. How to carry out the construction safely and efficiently is a difficult point to control on site.

[0003] In the traditional installation of ground-anchored wall reinforcement cage, the top lifting ring of the reinforcement cage is made of φ28 round steel; the lifting point position uses φ28 "J" round steel welded with the main reinforcement as the lifting reinforcement; the surface layer and the bottom layer of reinforcement at the lifting point position are welded and connected with φ28 "door" shaped round steel.

[0004] The arrangement of longitudinal and transverse hanging points is usually determined according to the length and width of the steel cage. The transverse hanging points are usually arranged at a spacing of no more than 1.5m, and the distance from the edge is no less than 0.5m. Taking a 6m wide conventional steel cage as an example, 4 transverse hanging points are set. The longitudinal hanging points are arranged according to the length of the steel cage. Generally, the main hanging is set with 2 rows of hanging points and the auxiliary hanging is set with several rows of hanging points. The specific position is determined according to the actual length combined with the bending moment calculation during horizontal hanging.

[0005] After the ground-connected wall steel cage is erected, the auxiliary hoist is connected and the main hoist is used to lift the steel cage in the straight slot to lower the cage. When it is lowered to the auxiliary hoisting point, the main hoist stops lowering and uses a horizontal bar to clamp the steel cage at the horizontal bar so that the weight of the steel cage is borne on the horizontal bar, and the cables and shackles of the auxiliary hoist are removed.

[0006] For the hoisting construction of deep-ground wall steel cages, the traditional hoisting method usually only sets two hoisting points on the main hoist. The main hoist has a small coverage area, which makes the auxiliary hoist bear a larger hoisting weight. In the final hoisting, the weight of the steel cage is borne entirely by the main hoist, so the main and auxiliary hoists must be large in size during the hoisting construction, which results in high rental costs. On the other hand, because there are only two main hoisting points with large spacing, when the fall rope is connected to the cable at the end, if the fall rope is too long, it is easy to get entangled with the steel cage. If it is too short, the operator needs to climb, which is a high risk operation.

[0007] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0008] In order to overcome the defects of the existing technology, a method for hoisting and constructing a deep and large ground-connected wall steel cage is provided to solve the problems that the traditional ground-connected wall steel cage hoisting method has few main hoisting points and the inverted rope is too long and easily entangled with the ground-connected wall steel cage.

[0009] To achieve the above object, a method for hoisting a deep and large ground-connected wall reinforcement cage is provided, comprising the following steps:

[0010] a. A plurality of first hanging points are arranged at the upper part of the steel cage of the ground-connected wall along the length direction of the steel cage of the ground-connected wall, a top hanging lug is arranged at the top of the steel cage, and a second hanging point is arranged at the lower part of the steel cage of the ground-connected wall;

[0011] b. Installing shoulder pole beams on the slings of the main crane respectively, and installing fixed pulleys c on the shoulder pole beams;

[0012] c. Connecting the two ends of the primary hanging cable to two adjacent first hanging points below the upper part of the steel cage;

[0013] d. Wrapping the middle part of the primary hanging rope around the primary movable pulley a;

[0014] e. Connecting the first end of the secondary hanging rope to the first hanging point of the upper track of the two adjacent first hanging points, and connecting the second end of the secondary hanging rope to the primary movable pulley a;

[0015] f. Wrapping the middle part of the secondary hanging rope around the secondary movable pulley b;

[0016] g. Repeat steps e to f until one end of the N-1th hanging rope is connected to the first hanging point at the top of the steel cage, the N-1th hanging rope is wound around the fixed pulley c, and the other end of the N-1th hanging rope is connected to the N-2th movable pulley, wherein N is the number of tracks at which the first hanging point is set;

[0017] h. Install the sling of the auxiliary crane on the second sling point;

[0018] i. When lowering the steel cage to the second lifting point by the main crane and the auxiliary crane, a horizontal bar is passed through the steel cage and both ends of the horizontal bar are placed on the notches of the groove of the ground-connected wall;

[0019] j. Remove the sling of the auxiliary crane on the second lifting point;

[0020] k. Remove the horizontal bar;

[0021] 1. The main crane lowers the steel cage to the first lifting point below the upper part of the steel cage, and then passes the cross bar through the steel cage and places the two ends of the cross bar on the notches of the grooves of the ground-connected wall;

[0022] m. Remove the primary hanging rope from the first hanging point below the upper part of the steel cage, and connect one end of the removed primary hanging rope to the first hanging point adjacent to the upper part;

[0023] n. Remove the horizontal bar;

[0024] o, the main crane lowers the steel cage to the first upper adjacent lifting point, then passes the cross bar through the steel cage and places the two ends of the cross bar on the notches of the grooves of the ground-connected wall;

[0025] p. Remove the primary hanging rope and connect one end of the secondary hanging rope to the first hanging point adjacent to the upper side;

[0026] q. Repeat steps n to p until the main crane lowers the steel cage to the N-1 first hanging point of the steel cage, remove the other end of the N-1th level hanging rope and connect it to the fall rope on the top first hanging point of the upper part of the steel cage;

[0027] r, removing the horizontal bar;

[0028] s. The main crane lowers the steel cage to the first lifting point on the top of the steel cage, and passes the cross bar through the steel cage and places the two ends of the cross bar on the notches of the grooves of the ground-connected wall;

[0029] t. Remove the N-1th level hanging rope and connect it to the top lifting lug;

[0030] u, remove the horizontal bar;

[0031] v. The main crane lowers the steel cage to a preset position.

[0032] Furthermore, there are multiple second hanging points, and the multiple second hanging points are arranged along the length direction of the steel cage.

[0033] Furthermore, the number of the first hanging points is at least four.

[0034] Furthermore, a side lifting lug is provided at the first lifting point, and the side lifting lug is connected to the bottom steel bar and the top steel bar of the steel cage.

[0035] The beneficial effect of the present invention is that the construction method of the deep ground-connected wall steel cage hoisting construction method of the present invention is more flexible and has a wider scope of application. By flexibly adding the first hoisting point of the main hoist, the main weight of the steel cage is still borne by the main hoist during horizontal hoisting, making the selection of the auxiliary hoist more flexible and saving costs. At the same time, because the spacing between the first hoisting points is evenly distributed, the steel cage can be lowered by multiple rope reversing, which is convenient for controlling various indicators when lowering the cage and reducing the risk of workers hanging the rope up and down, and avoiding the rope reversing and the steel cage being entangled during the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0037] Figure 1 This is a schematic diagram of the hoisting state of the steel cage of the ground-connected wall according to an embodiment of the present invention.

[0038] Figure 2 It is a schematic structural diagram of the top lifting ear of the reinforcement cage according to an embodiment of the present invention.

[0039] Figure 3 It is a schematic structural diagram of the side lifting ears of the steel cage according to an embodiment of the present invention.

[0040] Figures 4 to 7 It is a schematic diagram of the steps of the method for hoisting the deep earth-connected wall reinforcement cage according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] Reference Figures 1 to 7 As shown, the present invention provides a method for hoisting and constructing a deep ground-connected wall reinforcement cage, comprising the following steps:

[0044] a. Combination Figure 1 , Figure 2 and 4 As shown, a plurality of first hanging points are arranged at the upper part of the steel cage 1 of the ground-connected wall along the length direction of the steel cage 1 of the ground-connected wall, a top hanging lug 13 is arranged at the top of the steel cage 1, and a second hanging point is arranged at the lower part of the steel cage 1 of the ground-connected wall.

[0045] In this embodiment, the number of the first hanging points is at least four.

[0046] As a preferred implementation, see Figure 3 As shown, a side lifting lug 14 is provided at the first lifting point, and the side lifting lug 14 is connected to the bottom steel bars 11 and the top steel bars 12 of the steel cage 1 .

[0047] At the lifting point, a "J"-shaped lifting lug is made of φ28 round steel bars and welded to the steel cage. The lifting point should be set at the intersection of the longitudinal and transverse truss bars. The lifting point is connected to the cable through a shackle to facilitate the removal of the shackle during the lifting process. In addition, a "door" shape is made of φ28 round steel bars and reinforced at the lifting point, and the corresponding main bars on the top and bottom surfaces are pulled and connected.

[0048] At the first lifting point of the main crane (the top of the steel cage), the cables are clamped on the "J"-shaped lifting ears cross-set on the bottom and top surfaces of the steel cage using shackles. At the remaining lifting points, the cables are clamped on the "J"-shaped lifting ears cross-set on the top surface of the steel cage using shackles.

[0049] b. Install a shoulder pole beam on the sling of the main crane 2, and install a fixed pulley c on the shoulder pole beam.

[0050] c. Connect the two ends of the primary hanging rope 4 to the two adjacent first hanging points below the upper part of the steel cage 1 respectively.

[0051] d. Wrap the middle part of the primary hanging rope 4 around the primary movable pulley.

[0052] e. Connect the first end of the secondary hanging rope 5 to the first hanging point of the upper one of the two adjacent first hanging points, and connect the second end of the secondary hanging rope 5 to the primary movable pulley.

[0053] f. Wrap the middle part of the secondary hanging rope 5 around the secondary movable pulley.

[0054] g. Repeat steps e to f until one end of the N-1th hanging rope 6 is connected to the first hanging point at the top of the upper part of the steel cage 1, the N-1th hanging rope 6 is wound around the fixed pulley c, and the other end of the N-1th hanging rope 6 is connected to the N-2th movable pulley, where N is the number of tracks set for the first hanging point.

[0055] In this embodiment, the steel cage is about 40m long and 6m wide. The first suspension point is set to 4 rows of horizontal suspension points and 6 rows of longitudinal suspension points. The longitudinal suspension points are connected by pulleys, wherein the end of the cable of the first suspension point is connected to a row of movable pulleys, and the second and third suspension points are connected through the end movable pulleys.

[0056] If the steel cage is too long, the number of movable pulleys can be increased to increase the lifting points, that is, for each additional lifting point, one cable and one movable pulley are added, and the movable pulley is connected to the end of the previous cable. The additional cable connects the two lifting points through the additional movable pulley, thereby balancing the steel cage, making the lifting safer and more flexible to control.

[0057] h. Install the sling of the auxiliary crane 3 at the second sling point.

[0058] The number of the second hanging points is multiple and the multiple second hanging points are arranged along the length direction of the steel cage 1 .

[0059] The rated lifting capacity of the auxiliary crane is smaller than that of the main crane. If the main crane is a large model, the auxiliary crane can be a small model.

[0060] i. When the steel cage 1 is lowered to the second lifting point by the main crane 2 and the auxiliary crane 3, a cross bar is passed through the steel cage 1 and both ends of the cross bar are placed on the notches of the grooves of the ground-connected wall.

[0061] According to the longitudinal and transverse lifting point arrangement, the first lower cable of the shoulder beam of the main crane is installed at the first lifting point of the bottom layer and the first lifting point of the upper layer of the steel cage (cross-installed up and down), the second cable of the main crane is installed at the second lifting point of the upper layer of the steel cage, and the third cable of the main crane is installed at the third lifting point of the upper layer of the steel cage.

[0062] The fourth cable at the lower part of the shoulder beam of the auxiliary crane is installed at the fourth lifting point on the upper layer of the steel cage, the fifth cable of the auxiliary crane is installed at the fifth lifting point on the upper layer of the steel cage, and the sixth cable of the auxiliary crane is installed at the sixth lifting point on the upper layer of the steel cage.

[0063] After the steel cage is erected, the main crane will lift it to the target slot section alone. Double crane lifting is prohibited.

[0064] The lifting process is directed by a special commander. The crane must travel slowly and evenly to avoid excessive vibration. The travel speed should not exceed 6m / min.

[0065] During the lifting process, the crawler crane's tracks should maintain a distance of more than 0.5m from the edge of the guide wall wing to prevent damage to the guide wall or collapse of the slot section.

[0066] j. Remove the sling of the auxiliary crane 3 on the second lifting point.

[0067] k. Remove the horizontal bar.

[0068] 1. The main crane 2 lowers the steel cage 1 to the first lifting point below the upper part of the steel cage 1, and then passes the cross bar through the steel cage 1 and places the two ends of the cross bar on the notches of the grooves of the ground-connected wall.

[0069] m. Remove the primary hanging rope 4 of the first hanging point below the upper part of the steel cage 1, and connect one end of the removed primary hanging rope 4 to the adjacent first hanging point above.

[0070] n. Remove the horizontal bar.

[0071] o. The main crane 2 lowers the steel cage 1 to the first adjacent lifting point above, then passes the cross bar through the steel cage 1 and places the two ends of the cross bar on the notches of the groove of the ground-connected wall.

[0072] p. Remove the primary hanging rope 4, and connect one end of the secondary hanging rope 5 to the first adjacent hanging point above.

[0073] q. Repeat steps n to p until the main crane 2 lowers the steel cage 1 to the N-1 first hanging points of the steel cage 1, remove the other end of the N-1th level hanging rope 6 and connect it to the fall rope 7 on the top first hanging point of the upper part of the steel cage 1.

[0074] r. Remove the horizontal bar.

[0075] s. The main crane 2 lowers the steel cage 1 to the first lifting point at the top of the upper part of the steel cage 1, and passes the cross bar through the steel cage 1 and places the two ends of the cross bar on the notches of the grooves of the ground-connected wall.

[0076] t. Remove the N-1th level hanging rope 6 and connect it to the top lifting lug 13.

[0077] u. Remove the horizontal bar.

[0078] v. Main crane 2 lowers steel cage 1 to the preset position.

[0079] In this embodiment, when the steel cage is transported to the top of the slot section (the crawler crane track is not less than 2m away from the slot section), 3 to 4 assistants must go forward to straighten the steel cage, and then the on-site technicians will accurately position the steel cage when it is lowered. After that, the signalman will command the main crane to slowly lower the steel cage into the slot. When it is lowered to the auxiliary crane lifting point, the shackle is removed and the cable is evacuated. The specific operations are as follows:

[0080] (1) When the main crane is lowered to the second lifting point of the auxiliary crane, stop lowering the main crane, use a horizontal bar to clamp the steel cage through the horizontal bar, so that the weight of the steel cage is borne on the horizontal bar, and remove the cables and shackles of the auxiliary crane.

[0081] (2) After all the cables and shackles of the auxiliary crane are removed, the main crane is lifted to 0.3 meters and stopped, then the cross bar is pulled out and the main crane continues to lower the steel cage.

[0082] The measures for removing auxiliary hoisting ropes, shackles and other lifting equipment are consistent with conventional construction methods.

[0083] (3) When lowering to the third lifting point of the main crane, the main crane stops lowering, and uses a horizontal bar to clamp the steel cage through the horizontal bar, so that the weight of the steel cage is borne on the horizontal bar, remove the shackle of the third lifting point, and connect the end of the third cable with the shackle at the end of the second cable. After the installation is completed, the main crane is lifted 0.3 meters and stopped, and the horizontal bar is pulled out, and the main crane continues to lower the steel cage.

[0084] (4) When lowering to the second lifting point of the main crane, the main crane stops lowering, and uses a horizontal bar to clamp the steel cage through the horizontal bar so that the weight of the steel cage is borne on the horizontal bar. Remove the shackle of the second lifting point, and connect the end of the cable at the second lifting point and the end of the fall rope with the shackle. After the installation is completed, the main crane is lifted 0.3 meters and stopped, and the horizontal bar is pulled out, and the main crane continues to lower the steel cage.

[0085] (5) When the steel cage is lowered to the first lifting point under the cage top, clamp the cage head lifting point with the horizontal bar again, change the main crane's cable, install the main crane's cable on the lifting ring, lift the main crane, and pull out the horizontal bar after the main crane stops after lifting 0.3 meters. The lifting ring is about 4 meters high. When installing and removing the buckle, a mobile ladder needs to be set up for workers to go up and down.

[0086] (6) Continue to lower the steel cage. After the steel cage is in place, use the horizontal bar to pass through the lifting ring of the steel cage again. The steel cage is placed on the horizontal bar, and the shackles and slings of the cable are removed. The entire lifting process of the steel cage is completed.

[0087] Specifically, taking the steel cage of about 40m in length in this embodiment as an example, the steel cage needs to be roped four times in total during the process of entering the groove.

[0088] The first rope lowering: when the steel cage is lowered to the third lifting point of the main crane, the main crane stops lowering, the cross bar is inserted so that the weight of the steel cage is borne on the cross bar, the shackle of the third lifting point is removed, and the end of the third cable is connected with the shackle at the end of the second cable. After the installation is completed, the main crane is lifted 0.3 meters and stopped, the cross bar is pulled out, and the main crane continues to lower the steel cage.

[0089] Second rope lowering: When the steel cage is lowered to the second lifting point of the main crane, the main crane stops lowering, the cross bar is inserted so that the weight of the steel cage is borne on the cross bar, the shackle of the second lifting point is removed, and the end of the second cable and the end of the rope are connected with the shackle. After the installation is completed, the main crane is lifted 0.3 meters and stopped, the cross bar is pulled out, and the main crane continues to lower the steel cage.

[0090] The third rope lowering: when the steel cage is lowered to the first lifting point of the main crane, insert the horizontal bar so that the weight of the steel cage is borne on the horizontal bar, remove the shackles of the first 4 cables, and use the shackles to connect the 4 cables to the 8 lifting ears on the top of the steel cage. After the installation is completed, the main crane stops at 0.3 meters, pull out the horizontal bar, and continue to lower the steel cage.

[0091] For the fourth time, when the steel cage is lowered into place, four double-jointed horizontal bars are used to clamp the two sides of the lifting ears, so that the weight of the steel cage is borne by the horizontal bars above the guide wall, and then the shackles and lifting slings are removed.

[0092] Compared with the traditional hoisting and reversing construction method, the deep ground wall steel cage hoisting construction method of the present invention is more flexible in construction and has a wider range of applications. By flexibly adding the first hoisting point of the main hoist, the main weight of the steel cage is still borne by the main hoist during horizontal hoisting, making the selection of the auxiliary hoist more flexible and cost-saving. At the same time, because the spacing between the first hoisting points is evenly distributed, the steel cage can be lowered by reversing the rope multiple times, which is convenient for controlling various indicators when lowering the cage and reducing the risk of workers hanging the rope up and down, and avoiding the reversing rope and the steel cage being entangled during the process.

[0093] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A method for hoisting and constructing a deep earth-connected wall reinforcement cage, characterized in that: The following steps are involved: a. A plurality of first hanging points are arranged at the upper part of the steel cage of the ground-connected wall along the length direction of the steel cage of the ground-connected wall, a top hanging lug is arranged at the top of the steel cage, and a second hanging point is arranged at the lower part of the steel cage of the ground-connected wall; b. Installing shoulder pole beams on the slings of the main crane respectively, and installing fixed pulleys c on the shoulder pole beams; c. Connecting the two ends of the primary hanging cable to two adjacent first hanging points below the upper part of the steel cage; d. Wrapping the middle part of the primary hanging rope around the primary movable pulley a; e. Connecting the first end of the secondary hanging rope to the first hanging point of the upper track of the two adjacent first hanging points, and connecting the second end of the secondary hanging rope to the primary movable pulley a; f. Wrapping the middle part of the secondary hanging rope around the secondary movable pulley b; g. Repeat steps e to f until one end of the N-1th hanging rope is connected to the first hanging point at the top of the steel cage, the N-1th hanging rope is wound around the fixed pulley c, and the other end of the N-1th hanging rope is connected to the N-2th movable pulley, wherein N is the number of tracks at which the first hanging point is set; h. Install the sling of the auxiliary crane on the second sling point; i. When lowering the steel cage to the second lifting point by the main crane and the auxiliary crane, a horizontal bar is passed through the steel cage and both ends of the horizontal bar are placed on the notches of the groove of the ground-connected wall; j. Remove the sling of the auxiliary crane on the second lifting point; k. Remove the horizontal bar; 1. The main crane lowers the steel cage to the first lifting point below the upper part of the steel cage, and then passes the cross bar through the steel cage and places the two ends of the cross bar on the notches of the grooves of the ground-connected wall; m. Remove the primary hanging rope from the first hanging point below the upper part of the steel cage, and connect one end of the removed primary hanging rope to the first hanging point adjacent to the upper part; n. Remove the horizontal bar; o, the main crane lowers the steel cage to the first upper adjacent lifting point, then passes the cross bar through the steel cage and places the two ends of the cross bar on the notches of the grooves of the ground-connected wall; p. Remove the primary hanging rope and connect one end of the secondary hanging rope to the first hanging point adjacent to the upper side; q. Repeat steps n to p until the main crane lowers the steel cage to the N-1 first hanging point of the steel cage, remove the other end of the N-1th level hanging rope and connect it to the fall rope on the top first hanging point of the upper part of the steel cage; r, removing the horizontal bar; s. The main crane lowers the steel cage to the first lifting point on the top of the steel cage, and passes the cross bar through the steel cage and places the two ends of the cross bar on the notches of the grooves of the ground-connected wall; t. Remove the N-1th level hanging rope and connect it to the top lifting lug; u, remove the horizontal bar; v. The main crane lowers the steel cage to a preset position.

2. The method for hoisting and constructing a deep earth-connected wall reinforcement cage according to claim 1 is characterized in that: There are multiple second hanging points, and the multiple second hanging points are arranged along the length direction of the steel cage.

3. The method for hoisting and constructing a deep earth-connected wall reinforcement cage according to claim 1 is characterized in that: The number of the first suspension points is at least four.

4. The method for hoisting and constructing a deep earth-connected wall reinforcement cage according to claim 1 is characterized in that: The first lifting point is provided with a side lifting lug, and the side lifting lug is connected to the bottom steel bar and the top steel bar of the steel cage.

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