Prefabricated concrete circular pipe hoisting tool

Abstract

The utility model discloses a prefabricated concrete circular tube hoisting tool which comprises at least two groups of shear fork pieces which are the same in structure and synchronously act, and the shear fork pieces are connected in series through rod pieces; the shear fork piece comprises a first shear fork arm and a second shear fork arm, the middle portions of the first shear fork arm and the second shear fork arm are hinged, and the lower half sections of the first shear fork arm and the second shear fork arm are bent oppositely so as to surround the prefabricated concrete round pipe. One rod piece is connected with the first shear fork arms, and the other rod piece is connected with the second shear fork arms. According to the hoisting tool, the shear fork pieces of the same structure are adopted to surround the prefabricated concrete circular pipe for hoisting, the traditional hoisting mode that a steel wire rope penetrates into the prefabricated concrete circular pipe is replaced, and the position of a hoisting point is changed into a pipe body from a traditional pipe opening. Extrusion and friction between the steel wire rope and a pipe opening of the prefabricated concrete circular pipe during hoisting are avoided, damage to the prefabricated concrete circular pipe is reduced, meanwhile, abrasion caused by long-term friction between the steel wire rope and the prefabricated concrete circular pipe is avoided, the fracture risk of the steel wire rope is reduced, and the stability of the hoisting tool is improved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of prefabricated pipe installation, in particular to a prefabricated concrete circular pipe hoisting tool. Background Art

[0002] Concrete round tubes are prefabricated components commonly used in civil engineering construction, especially in road construction. Due to their heavy weight, they often require lifting equipment to move.

[0003] In the existing technology, due to the lack of dedicated lifting tools, on-site construction workers usually use wire ropes as simple lifting tools. During lifting, they insert the wire ropes into the precast concrete circular tubes, then secure both ends to the lifting tools. The lifting tools are then used to pull the wire ropes to lift and move the precast concrete circular tubes. This method of using wire ropes as lifting tools has obvious disadvantages: during the lifting process, the wire ropes are squeezed and rubbed against the tube ends of the precast concrete circular tubes, which can easily damage the precast concrete circular tubes and create gaps. Correspondingly, the wire ropes will also wear out due to long-term friction with the precast concrete circular tubes, which may cause them to break, posing a serious safety hazard. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a prefabricated concrete circular pipe hoisting tool.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A precast concrete circular pipe lifting tool comprises at least two sets of scissor parts with identical structures and synchronous movements, wherein the scissor parts are connected in series via a rod; the scissor parts comprise a first scissor arm and a second scissor arm, the middle portions of the two being hinged, and the lower halves of the two arms being bent towards each other so as to be able to embrace the precast concrete circular pipe; there are two rods, one connecting the first scissor arms and the other connecting the second scissor arms.

[0007] At least two sets of scissor parts with the same structure are used to embrace the precast concrete circular pipe for lifting, replacing the traditional lifting form of the steel wire rope passing through the precast concrete circular pipe, and the position of the lifting point is changed from the traditional pipe mouth to the pipe body. Specifically, two connecting rods are used to connect the first scissor arm and the second scissor arm in series to lift the precast concrete circular pipe. The first scissor arm and the second scissor arm are opened towards each other and can smoothly embrace the precast concrete circular pipe. The lifting work can be completed by connecting the connecting rods with a lifting rope. The present application avoids the squeezing and friction between the steel wire rope hoisting and the pipe mouth of the precast concrete circular pipe, reduces the damage to the precast concrete circular pipe, and at the same time, avoids the wear of the steel wire rope due to long-term friction with the precast concrete circular pipe, reduces the risk of steel wire rope breakage, and improves the stability of the lifting tool.

[0008] In the above-mentioned precast concrete circular pipe lifting tool, preferably, the lower ends of the first scissor arm and the second scissor arm are both provided with abutment plates, and the ends of the abutment plates facing away from the hinge axis are configured as arc surfaces adapted to the curvature of the outer surface of the precast concrete circular pipe.

[0009] The end of the abutment plate facing away from the hinge axis is designed to have a curved surface that matches the curvature of the outer surface of the precast concrete tube. This curved surface increases the contact area between the abutment plate and the precast concrete tube, ensuring that the abutment plate can better conform to the outer surface of the precast concrete tube.

[0010] In the above-mentioned precast concrete round pipe lifting tool, preferably, a side of the abutment plate for contacting the precast concrete round pipe is provided with an anti-slip layer.

[0011] The side of the adapter plate that contacts the precast concrete tube is equipped with an anti-slip layer. This increases friction between the two surfaces, preventing the tube from sliding along the adapter plate under its own weight. This anti-slip layer is applied using conventional techniques. This can be achieved by applying an anti-slip coating (such as a rubber coating) to the adapter plate or by directly applying anti-slip ridges to the plate.

[0012] In the above-mentioned precast concrete circular pipe lifting tool, preferably, the scissors member also includes an elastic member, which is clamped between the upper half of the first scissors arm and the lower half of the second scissors arm, or / and between the lower half of the first scissors arm and the upper half of the second scissors arm, or / and between the upper half of the first scissors arm and the upper half of the second scissors arm, or / and between the lower half of the first scissors arm and the lower half of the second scissors arm; in the no-load state, the lower end of the first scissors arm and the lower end of the second scissors arm are open, and the end spacing M and the outer diameter N of the precast concrete circular pipe satisfy: 1 / 4N≤M≤1 / 2N.

[0013] During the process of hoisting the precast concrete circular tube, the elastic member drives the lower half of the first scissor arm and / or the second scissor arm connected thereto to open. When hoisting the precast concrete circular tube, the elastic member drives the lower half of the first scissor arm and / or the second scissor arm connected thereto to close, and provides a force in the opposite direction, so that the abutment plate connected to its end can tightly contact the outer surface of the precast concrete circular tube, thereby improving the reliability of the hoisting tool. The lower ends of the first scissor arm and the second scissor arm are open, and the relationship between their ends and the outer diameter N of the precast concrete circular tube satisfies the following conditions: 1 / 4N≤M≤1 / 2N. Ensure that the openings of the lower halves of the first scissor arm and the second scissor arm can reach or pass through the central axis of the precast concrete circular tube, so that they can smoothly embrace the precast concrete circular tube, and ensure that the abutment plate at its lower end can contact the central axis of the precast concrete circular tube and the outer surface below the central axis, thereby ensuring the effectiveness of the selection of the hoisting point.

[0014] In the above-mentioned precast concrete circular pipe lifting tool, preferably, the upper ends of the first scissor arm and the second scissor arm are both formed with sleeves, and the rod passes through the sleeves; a plurality of limiting holes are formed at intervals on the rod, and limiting pins for limiting the slippage of the scissor parts are detachably inserted into the limiting holes.

[0015] The rod directly passes through the first and second scissor arms, each equipped with a formed sleeve, to connect the rod and scissor member. This reduces the deflection of the connection, mitigates the impact of concentrated loads on the rod connection during lifting, and increases the rod's service life. Several limiting holes are spaced apart on the rod to allow for timely adjustment of the scissor member's position according to varying lifting requirements. Removable limiting pins are inserted into the limiting holes to prevent the scissor member from slipping. Furthermore, the simple connection structure facilitates both disassembly and installation, making it easy to replace different types of scissor members according to the outer diameter of the precast concrete circular pipe.

[0016] In the above-mentioned precast concrete circular pipe lifting tool, preferably, the length P of the sleeve and the diameter Q of the rod satisfy: 2Q≤P≤4Q.

[0017] The length P of the sleeve and the diameter Q of the rod satisfy: 2Q≤P≤4Q. On the one hand, it prevents the length of the sleeve from being too short, which will cause stress concentration during the lifting process and cause deformation of the rod; on the other hand, it prevents the length of the sleeve from being too long, which will cause failure of the rod connection.

[0018] In the above-mentioned precast concrete circular pipe lifting tool, preferably, the limiting holes are distributed at equal intervals, and the minimum spacing R between adjacent limiting holes is consistent with the length P of the sleeve.

[0019] The limiting holes are evenly distributed on the outside of the hanging ring, and the minimum spacing R between adjacent limiting holes is consistent with the length P of the sleeve, that is, the minimum spacing of the limiting holes is adapted to the length of the sleeve. The installation position of the scissors parts can be determined according to the limiting holes, which facilitates the installation and positioning of the scissors parts and ensures that the scissors parts at both ends of the rod are symmetrically distributed.

[0020] In the above-mentioned precast concrete circular pipe lifting tool, preferably, each rod is formed with at least two hanging rings for connecting external lifting ropes.

[0021] The rods are provided with hanging rings for connecting external lifting ropes, and there are no less than two hanging rings on each rod, which increases the fulcrum points of the lifting ropes, ensures that the overall force of the rods is evenly distributed, reduces the swing amplitude of the precast concrete circular tubes during the lifting process, and improves the safety of the lifting tools.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] The precast concrete circular pipe lifting tool of the present invention adopts at least two sets of scissor parts with the same structure to embrace the precast concrete circular pipe for lifting, replacing the traditional lifting form of the steel wire rope passing through the precast concrete circular pipe, and changing the position of the lifting point from the traditional pipe mouth to the pipe body. Specifically, two connecting rods are used to connect the first scissor arm and the second scissor arm in series respectively to lift the precast concrete circular pipe. The first scissor arm and the second scissor arm are opened towards each other and can smoothly embrace the precast concrete circular pipe. The lifting work can be completed by connecting the connecting rods with a lifting rope. The present application avoids the squeezing and friction between the steel wire rope hoisting and the pipe mouth of the precast concrete circular pipe, reduces the damage to the precast concrete circular pipe, and at the same time, avoids the wear of the steel wire rope due to long-term friction with the precast concrete circular pipe, reduces the risk of steel wire rope breakage, and improves the stability of the lifting tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of a precast concrete circular pipe lifting tool;

[0025] Figure 2 This is the lifting process diagram Figure 1 ;

[0026] Figure 3 This is the lifting process diagram Figure 2 ;

[0027] Figure 4 This is the lifting process diagram Figure 3 ;

[0028] Figure 5 This is the lifting process diagram Figure 4 .

[0029] The numbers in the figure represent: 01, precast concrete circular tube; 02, lifting rope; 1, scissor member; 11, first scissor arm; 12, second scissor arm; 13, abutment plate; 14, elastic member; 15, sleeve; 2, rod; 21, limiting hole; 22, limiting pin; 23, hanging ring. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example

[0032] like Figure 1-Figure 5 As shown, the precast concrete circular tube lifting tool of this embodiment includes at least two groups of scissor parts 1 with the same structure and synchronous movement, and each scissor part 1 is connected in series through a rod 2; the scissor part 1 includes a first scissor arm 11 and a second scissor arm 12, the middle parts of the two are hinged, and the lower halves of the two are bent toward each other so as to be able to embrace the precast concrete circular tube 01; there are two rods 2, one of which is connected to each first scissor arm 11, and the other is connected to each second scissor arm 12.

[0033] In this embodiment, the lower ends of the first and second scissor arms 11, 12 are each provided with an abutment plate 13. The end of the abutment plate 13 facing away from the hinge axis is configured as an arc surface that matches the curvature of the outer surface of the precast concrete tube 01. When hoisting the precast concrete tube 01, the first and second scissor arms 11, 12 are opened and gradually moved downward until they can encircle the precast concrete tube 01 and the abutment plates 13 at their lower ends are in close contact with the outer surface of the precast concrete tube 01.

[0034] In this embodiment, the side of the abutment plate 13 that is used to fit the precast concrete circular tube 01 is provided with an anti-slip layer. The anti-slip layer can be a non-slip coating (such as a rubber coating) applied to the adapter plate, or anti-slip lines can be directly added to the adapter plate.

[0035] In this embodiment, the scissor member 1 further includes an elastic member 14, which is clamped between the upper half of the first scissor arm 11 and the lower half of the second scissor arm 12, and between the lower half of the first scissor arm 11 and the upper half of the second scissor arm 12; in the no-load state (that is, when the lifting tool is not in contact with the precast concrete circular tube 01), under the pulling action of the elastic member 14, the lower end of the first scissor arm 11 and the lower end of the second scissor arm 12 are opened, and the end distance M and the outer diameter N of the precast concrete circular tube 01 meet the following conditions: 1 / 4N≤M≤1 / 2N, such as Figure 2 When starting to hoist, first move the hoisting tool down until the abutment plate 13 hinged at the lower end of the first scissor arm 11 and the second scissor arm 12 contacts the precast concrete circular tube 01. Under the action of pressure, the abutment plate 13 adaptively flips and fits the surface of the precast concrete circular tube 01, as shown. Figure 3 Then, the lifting tool continues to move downward under the action of gravity. During this process, the elastic member 14 is compressed under the pressure, so that the distance between the lower end of the first scissor arm 11 and the lower end of the second scissor arm 12 gradually increases, and the abutment plate 13 always adaptively flips under the pressure and always fits with the surface of the precast concrete circular tube 01, as shown. Figure 4 As shown. After the lower ends of the first scissor arm 11 and the second scissor arm 12 pass through the widest part of the precast concrete circular tube 01 and continue to move downward, under the elastic force of the elastic member 14, the lower ends of the first scissor arm 11 and the lower ends of the second scissor arm 12 gradually shrink. During this process, the abutment plate 13 also adaptively flips under the pressure and always adheres to the surface of the precast concrete circular tube 01, so that the lifting tool forms an embrace around the precast concrete circular tube 01, as shown. Figure 5 As shown, the process can be completed by utilizing the deadweight of the lifting tool and the elastic force of the elastic member 14 in cooperation with each other, without manual participation, thus saving manpower.

[0036] In this embodiment, sleeves 15 are formed at the upper ends of the first and second scissor arms 11, 12, through which the rod 2 extends. A plurality of limiting holes 21 are formed at intervals on the rod 2, into which limit pins 22 are removably inserted for limiting the slippage of the scissor member 1. When assembling the lifting tool, the model of the scissor member is first determined based on the lifting requirements. The sleeves 15 of the first and second scissor arms 11, 12 are then respectively connected to the appropriate positions of the different rods 2. Finally, the limit pins 22 are inserted into the adjacent limit holes 21 at both ends of the sleeves 15.

[0037] In this embodiment, the length P of the sleeve 15 and the diameter Q of the rod 2 satisfy: 2Q≤P≤4Q.

[0038] In this embodiment, the limiting holes 21 are evenly spaced, and the minimum spacing R between adjacent limiting holes 21 is consistent with the length P of the sleeve 15. The limiting holes 21 are evenly spaced outside the hanging ring 23, and the installation position of the scissors can be determined according to their position.

[0039] In this embodiment, each rod 2 is formed with at least two hanging rings 23 for connecting the external hanging rope 02. Only the external hanging rope 02 needs to be tied to the hanging rings 23 to start the hoisting work of the precast concrete round pipe 01.

[0040] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the present invention, or modify it into equivalent embodiments with equivalent variations. Therefore, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the content of the present invention and are based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A precast concrete round pipe lifting tool, characterized by: The invention comprises at least two groups of scissor members (1) with identical structures and synchronous movements, wherein each of the scissor members (1) is connected in series via a rod member (2); the scissor member (1) comprises a first scissor arm (11) and a second scissor arm (12), the middle portions of the two being hinged, and the lower halves of the two being bent toward each other so as to be able to embrace a precast concrete circular tube (01); the rod member (2) has two members, one of which is connected to each first scissor arm (11) and the other is connected to each second scissor arm (12).

2. The precast concrete circular pipe lifting tool according to claim 1, characterized in that: The lower ends of the first scissor arm (11) and the second scissor arm (12) are both provided with abutment plates (13), and the ends of the abutment plates (13) facing away from the hinge axis are configured as arc surfaces adapted to the curvature of the outer surface of the precast concrete circular tube (01).

3. The precast concrete circular pipe lifting tool according to claim 2, characterized in that: The abutment plate (13) is provided with an anti-slip layer on one side thereof for contacting the precast concrete circular tube (01).

4. The precast concrete circular pipe lifting tool according to claim 1, characterized in that: The scissors member (1) further includes an elastic member (14), wherein the elastic member (14) is clamped between the upper half of the first scissors arm (11) and the lower half of the second scissors arm (12), or / and between the lower half of the first scissors arm (11) and the upper half of the second scissors arm (12), or / and between the upper half of the first scissors arm (11) and the upper half of the second scissors arm (12), or / and between the lower half of the first scissors arm (11) and the lower half of the second scissors arm (12); in an unloaded state, the lower end of the first scissors arm (11) and the lower end of the second scissors arm (12) are open, and the end spacing M and the outer diameter N of the precast concrete circular pipe (01) satisfy: 1 / 4N≤M≤1 / 2N.

5. The precast concrete circular pipe lifting tool according to claim 1, characterized in that: The upper ends of the first scissor arm (11) and the second scissor arm (12) are both formed with sleeves (15), and the rod (2) passes through the sleeves (15); a plurality of limiting holes (21) are formed at intervals on the rod (2), and limiting pins (22) for limiting the sliding of the scissor member (1) are detachably inserted into the limiting holes (21).

6. The precast concrete circular pipe lifting tool according to claim 5, characterized in that: The length P of the sleeve (15) and the diameter Q of the rod (2) satisfy: 2Q≤P≤4Q.

7. The precast concrete circular pipe lifting tool according to claim 5 or 6, characterized in that: The limiting holes (21) are distributed at equal intervals, and the minimum spacing R between adjacent limiting holes (21) is consistent with the length P of the sleeve (15).

8. The precast concrete circular pipe lifting tool according to claim 1, characterized in that: Each rod (2) is formed with at least two hanging rings (23) for connecting to external hanging ropes.

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