A pre-tightening self-locking device

Abstract

The present invention relates to a pre-tightening self-locking device, which is used to prevent the sliding formwork body of dam panel concrete pouring from falling. The device comprises a fixed support, a main shaft, a hoisting drum, a safety steel rope, a pre-tightening assembly and a self-locking assembly; one end of the safety steel rope is fixed on the hoisting drum and wound on the hoisting drum, the hoisting drum, the self-locking assembly and the pre-tightening assembly are connected and sleeved on the main shaft in sequence, and the two ends of the main shaft are fixedly connected to the fixed support. The pre-tightening self-locking device of the present invention can fix the sliding formwork body on the dam top for a second time through the safety steel rope, so as to prevent the sliding formwork body from falling when the hoisting machine wire rope is broken, and play a secondary insurance role.

Description

Technical Field

[0001] The invention belongs to the field of water conservancy and hydropower engineering construction, and specifically relates to the anti-falling of a sliding formwork body during dam panel concrete pouring construction, in particular to a pre-tightening self-locking device for preventing the sliding formwork body from falling during dam panel concrete pouring construction for safety protection. Background Art

[0002] The panel rockfill dam is the most common dam type for water conservancy and hydropower construction design in my country (and even abroad). The main dam body is made of rockfill. When the rockfill dam is filled to a certain elevation (generally around 70-100 meters), it is necessary to cast concrete panels on the water retaining surface. The purpose is to prevent the water in the reservoir from leaking from the dam body and the scouring of the water flow from causing dam breach accidents when the reservoir is filled with water in the future. Therefore, the casting of concrete panels is an important construction process.

[0003] The main method for pouring concrete for the dam panel is slipform construction. The entire dam panel is divided into several construction blocks. The formwork is supported on both sides of each block, and then a slipform body is placed on the two formworks. It is slowly pulled up from the bottom of the dam by two winches installed on the top of the dam. The sliding speed should be determined according to the designed concrete pouring speed. The winch traction speed is generally 10 meters / minute. The sliding distance each time is about 0.2-0.5 meters. The dam has an inclination of about 35° (slope ratio of 1:1.4) and a slanted length of about 160 meters.

[0004] Since the slipform body weighs 7-9 tons, there are construction workers on the slipform body during the construction process. These workers accompany the entire dam panel slipform construction process. Once the traction wire rope of the winch pulling the slipform body is broken, the slipform body will slide down at a high speed, causing safety problems for the construction workers.

[0005] Therefore, the problem of how to prevent the sliding form body from falling when the winch traction wire rope breaks needs to be solved. Summary of the invention

[0006] The present invention provides an additional safety guarantee by arranging a pre-tightening self-locking device on the concrete counterweight column of the sliding form body or the load-bearing sliding form body. When the traction wire rope of the winch is broken, the pre-tightening self-locking device will pull the sliding form body, thereby preventing the sliding form body from falling and providing insurance.

[0007] Specifically, the present invention provides a pre-tightening self-locking device for preventing the dam panel concrete pouring slipform from falling. The device comprises a fixed support, a main shaft, a winch drum, a safety steel rope, a pre-tightening assembly and a self-locking assembly; one end of the safety steel rope is fixed on the winch drum and wound on the winch drum, the winch drum, the self-locking assembly and the pre-tightening assembly are sequentially connected and sleeved on the main shaft, and both ends of the main shaft are fixedly connected to the fixed support.

[0008] In some preferred embodiments, the fixed support is fixed to a concrete counterweight column on a side wall of the slipform body or a dam top.

[0009] In some preferred implementations, the pre-tightening self-locking device connects the slipform body to the concrete counterweight column on the dam top via a safety steel rope.

[0010] There are two ways to install the pre-tensioning self-locking device: one is to install the pre-tensioning self-locking device on the dam top, fix it on the concrete counterweight column, and connect it to the slipform body through steel ropes. The other is to install the pre-tensioning self-locking device directly on both ends of the slipform body, and fix the other end to the concrete counterweight column or the steel rope fixing point on the dam top through steel ropes. When the hoist traction wire rope is broken, the safety steel rope of the pre-tensioning self-locking device can prevent the slipform body from sliding down and falling, thereby ensuring the safety of the construction workers.

[0011] In some preferred embodiments, the preload assembly includes an inner ratchet fixed wheel, a turbine and a preload spring which are sequentially sleeved on the main shaft; the ratchet pawl of the turbine is meshed with the inner ratchet of the inner ratchet fixed wheel.

[0012] In some preferred embodiments, the self-locking assembly includes a self-locking pawl disk and an inner ratchet wheel which are sequentially sleeved on the main shaft; the inner ratchet wheel is meshed with the self-locking pawl disk.

[0013] In some preferred embodiments, the preload spring is in a spiral structure; the inner spring hook of the preload spring is fixedly connected to the pin of the preload pawl disk; and the outer spring hook of the preload spring is fixedly connected to the pin of the self-locking pawl disk.

[0014] In some preferred embodiments, the hoisting drum is fixedly connected to the inner ratchet wheel by bolts.

[0015] In some preferred embodiments, a manual lever is provided on the inner ratchet wheel.

[0016] In some preferred embodiments, a worm is provided on the turbine, and the worm is mounted on the circumferential end surface of the worm wheel through engagement with a thread on the worm.

[0017] In some preferred embodiments, the main shaft further includes a key pin; the inner ratchet fixing wheel is fixedly connected to the main shaft after engaging with the key pin.

[0018] Some preferred embodiments further include a back-moving assembly; the back-moving assembly includes a back-moving pawl plate and a back-moving pawl; the back-moving pawl plate is fixedly connected to the winch drum by bolts; an outer back-moving ratchet gear is provided on the outer periphery of the back-moving pawl plate; the outer back-moving ratchet gear is fixed on one side of the winch drum; the back-moving pawl is fixedly mounted on a fixed support.

[0019] In some preferred embodiments, the inner ratchet wheel and the stop pawl disc are connected to the main shaft via bearings.

[0020] Beneficial Effects

[0021] The pre-tightening self-locking device of the present invention can fix the sliding form body on the dam top for a second time through the safety steel rope, so as to prevent the sliding form body from falling when the hoist wire rope is broken, thus playing a secondary insurance role. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the pre-tightening self-locking device of the present invention;

[0023] Figure 2 This is a schematic diagram of the exploded structure of the pre-tightening self-locking device of the present invention;

[0024] Figure 3 It is an enlarged schematic diagram of a partially exploded structure of the pre-tightening self-locking device of the present invention;

[0025] Figure 4 It is an enlarged schematic diagram of a partially exploded structure of the pre-tightening self-locking device of the present invention;

[0026] Figure 5 It is a schematic diagram of the pre-tightening self-locking device of the present invention installed on the dam top;

[0027] Figure 6 It is a schematic diagram of the pre-tightening self-locking device of the present invention installed on the sliding mold body.

[0028] Reference numerals

[0029] Preload self-locking device 20, main shaft 1, inner ratchet fixed wheel 2, inner ratchet 21, turbine 3, pawl 31, pin 32, preload spring 4, inner spring hook 42, outer spring hook 41, self-locking pawl plate 5, pawl 51, pin 52, inner ratchet rotating wheel 6, inner ratchet 61, winch drum 7, insurance steel rope 8, bolt 9, key pin 10, worm 11, locking lever 12, anti-retraction pawl plate 22, anti-retraction outer ratchet 13, anti-retraction pawl 14, fixed support 15, sliding form body 16, concrete counterweight column 17, bearing 18, handle 19, winch 81, traction wire rope 82, steel rope fixing point 83 DETAILED DESCRIPTION

[0030] The following further describes the structures or technical terms used in the present invention. In the following detailed description, the reference text attached to the legend is a part of this part, which is described in the way of illustrating the specific specific scheme that the present invention may be implemented. We do not exclude that the present invention can also implement other specific schemes and change the structure of the present invention without violating the scope of use of the present invention.

[0031] like Figure 2As shown, the pre-tightening self-locking device 20 of the present invention has two major functions: pre-tightening function and self-locking function. The pre-tightening self-locking device is a kind of pre-tightening spring (spring spring) that is tightened by manually adjusting the worm wheel and worm, driving the linkage mechanism to realize the winding of the safety wire rope by the winch drum. After a certain distance of traction, the elastic force of the pre-tightening spring is released and the winding effect is lost. At this time, it is necessary to rotate the worm wheel and worm to tighten the spring, and the purpose of pre-tightening self-locking is achieved repeatedly. Through pre-tightening and self-locking, the sliding form body 16 connected thereto and the dam top have a relatively fixed relationship, and the pre-tightening self-locking device 20 can move together with the sliding form body 16 when it moves toward the dam top. After moving a certain distance, the sliding form body 16 stops moving and construction is carried out. In this process, the pre-tightening self-locking device 20 realizes the pre-tightening and self-locking functions, so that the sliding form body 16 and the dam top are tensioned and fixed by the steel rope 8. At this time, if the load-bearing winch steel rope breaks, the pre-tightening self-locking device 20 keeps the sliding form body 16 in place and does not move, that is, it does not fall. The pre-tightening self-locking device 20 of the present invention can be fixed on the sliding form body 16, and can also be fixed on the dam top. Figure 5 , the pre-tightening self-locking device 20 is installed on the concrete counterweight column 17 on the dam top, fixed by the pre-buried anchor rod, and the other end of the steel rope 8 is fixed to the side end of the sliding form body 16. Figure 6 As shown, the pre-tightening self-locking device 20 is directly installed on the side end of the sliding formwork 16, and the other end of the steel rope 8 is fixed on the concrete counterweight column 17 or the steel rope fixing point 83 on the dam top. Regardless of whether the pre-tightening self-locking device 20 is fixed on the sliding formwork 16 or the concrete counterweight column 17 on the dam top, the traction object is the sliding formwork 16. In actual use, the sliding formwork 16 itself is pulled upward by a winch 81 on the left and right sides of the dam top. The sliding process of the winch 81 pulling the sliding formwork 16 is not continuous sliding, but intermittent sliding; that is, each time the winch 81 pulls the sliding formwork 16 up about 0.2-0.7 meters, waits for the completion of this section of concrete pouring construction, and then slides up the same distance. The construction process takes about 30-60 minutes, and this cycle is repeated until the sliding formwork 16 slides to the dam top. When the traction wire rope 82 of the hoist 81 connected to the sliding form body 16 is broken, the steel rope 8 of the pre-tightening self-locking device 20 can prevent the sliding form body 16 from sliding down and falling, thereby ensuring the safety of the construction workers. Specifically, in order to add an insurance to the sliding form body 16 to prevent the falling accident, the pre-tightening self-locking device 20 and the safety steel rope 8 connected to the pre-tightening self-locking device 20 are added. The safety steel rope 8 does not directly produce a traction effect, but only serves as an additional insurance when the traction wire rope 82 of the hoist 81 is accidentally broken. In the actual operation of the sliding form body 16, it is only necessary to keep the safety steel rope 8 taut. Therefore, the present invention adopts a relatively elastic spring 4 for tensioning. Since the tightening length of the spring spring is limited, when the hoist drum 7 reels the safety steel rope 8 to a certain distance, the spring spring 4 needs to be tightened again to achieve the winding force of the hoist drum 7 to tighten the safety steel rope 8.

[0032] In some embodiments, each sliding form body 16 is equipped with two pre-tightening self-locking devices 20 , and the pre-tightening self-locking devices 20 are respectively fixed on both sides of the sliding form body 16 or on two concrete counterweight columns 17 on the dam top.

[0033] like Figure 1 and Figure 2 As shown in the figure, the specific structure of the pre-tightening self-locking device 20 is shown, and the device 20 includes a main shaft 1, a hoisting drum 7, a pre-tightening assembly, a self-locking assembly, a fixed support 15 and a steel rope 8. The hoisting drum 7, the pre-tightening assembly and the self-locking assembly are installed on the main shaft 1, and the pre-tightening assembly, the self-locking assembly and the hoisting drum 7 are connected in sequence. The two ends of the main shaft 1 are connected to the fixed support 15, so that the main shaft 1 is fixed to the fixed support 15, that is, the main shaft 1 is fixed to the sliding form 16 (or the concrete counterweight column 17). The steel rope 8 is wound on the hoisting drum 7, one end of the steel rope 8 is connected to the hoisting drum 7, and the other end is fixedly connected to the concrete counterweight column 17 on the top of the dam (when the pre-tightening self-locking device 20 is fixedly connected to the side end of the sliding form 16), or the other end is fixedly connected to the side end of the sliding form 16 (when the pre-tightening self-locking device 20 is fixedly connected to the concrete counterweight column 17 on the top of the dam). When the sliding form body 16 moves toward the dam top, the steel rope 8 is automatically wound onto the hoisting drum 7 under the drive of the hoisting drum 7 .

[0034] The preload assembly includes an inner ratchet fixed wheel 2, a turbine 3 and a preload spring 4, and the inner ratchet fixed wheel 2, the turbine 3 and the preload spring 4 are sleeved on the main shaft 1 in sequence. A ratchet 31 is processed on one side of the worm wheel 3, which matches the inner ratchet 21. A pin 32 is processed on the other side of the worm wheel 3. The worm 11 is installed in contact with the circumferential end surface of the worm wheel 3. By rotating the handle 19 of the worm 11, the worm 11 is rotated, and the thread on the worm 11 rotates. Since the thread on the worm 11 is engaged with the circumferential thread of the turbine 3, the turbine 3 is driven to rotate. The preload spring 4 is a spiral structure. The inner spring hook 42 of the preload spring 4 is fixedly connected to the pin 32 of the turbine 3 so that the preload spring 4 is connected to the preload ratchet disc 3. When the worm 11 drives the worm wheel 3 to rotate, the pin 32 will tighten the inner spring hook 42, so that the preload spring 4 generates a winding elastic force. Specifically, the handle 19 is rotated to link the worm 11 , and the pin 32 on the turbine 3 is adjusted to tighten the preload spring 4 through the force transmission principle of the worm 11 of the turbine 3 .

[0035] The self-locking assembly includes a self-locking pawl disk 5 and an inner ratchet wheel 6, and the self-locking pawl disk 5 and the inner ratchet wheel 6 are sequentially sleeved on the main shaft 1. The inner ratchet wheel 6 is meshed and fixed with the self-locking pawl disk 5. Specifically, the inner ratchet 61 of the inner ratchet wheel 6 and the pawl 51 of the self-locking pawl disk cooperate with each other. At the same time, the outer spring hook 41 of the preload spring 4 is fixedly connected to the pin 52 of the self-locking pawl disk 5 to connect the preload spring 4 with the self-locking pawl disk 5. In this way, the preload assembly and the self-locking assembly are connected together through the preload spring 4. The self-locking assembly is connected to one side of the hoisting drum 7, and the hoisting drum 7 is rotated and self-locked through the self-locking assembly. Specifically, the bolt 9 locks the inner ratchet wheel 6 and the winch drum 7, and the release force of the preload spring 4 is transmitted to the pin 52 through the outer spring hook 41, and then the inner ratchet 61 is rotated through the pawl 51, so that the winch drum 7 fixed with the inner ratchet wheel 6 winds up the safety steel rope 8, realizing the self-locking function.

[0036] also, Figure 2 , Figure 3 and Figure 4 As shown, in the pre-tightening self-locking device 20, the axis of the inner ratchet fixed wheel 2 has a bayonet, which is buckled on the key pin 10 at one end of the main shaft 1, so that the inner ratchet fixed wheel 2 is fixed to the main shaft 1, that is, the pre-tightening component is fixedly connected to the main shaft 1. The self-locking component is connected to the hoisting drum 7. Specifically, the hoisting drum 7 is fixedly connected to the inner ratchet wheel 6 by bolts 9. The pre-tightening and self-locking of the hoisting drum 7 are achieved by the pre-tightening component and the self-locking component, that is, the steel rope 8 wound on the hoisting drum 7 is pre-tightened and self-locked, thereby achieving the pre-tightening and self-locking fixation of the sliding mold body 16.

[0037] In some specific embodiments, the preload spring 4 can satisfy the preload elastic force of two turns. Under the action of the spring force, the preload spring 4 will automatically apply the rotational force to the self-locking pawl disk 5, and then act on the winch drum 7 through the manual inner ratchet wheel 6, so as to realize the preload of the winch drum 7. Specifically, since the safety steel rope 8 will be loose when the sliding body 16 is pulled upward by the winch 81, in order to prevent this phenomenon from occurring, the preload spring 4 can be tightened in advance by rotating the handle 19 of the worm 11 to drive the worm wheel to rotate. Under the action of the spring force, the rotational force will automatically act on the self-locking pawl disk 5, and then drive the inner ratchet wheel 6 to act on the winch drum 7. Therefore, when the sliding body 16 slides up a certain distance, the winch drum 7 will automatically tighten the safety steel wire rope under the action of the preload spring 4. When the preload spring 4 is loose, the worm 11 should be rotated to tighten it, and the cycle is repeated.

[0038] In addition, a manual lever 12 is provided on the inner ratchet wheel 6. Pulling the manual lever 12 locks the inner ratchet wheel 6 with the self-locking pawl plate 5 and the winch drum 7, thereby realizing the self-locking function of the winch drum and the steel rope. Usually, the locking plate rod 12 is used as a manual standby to tighten the winch drum.

[0039] The pre-tightening self-locking device 20 of the present invention also includes a backstop assembly. The backstop assembly is used to prevent the hoisting drum 7 from rotating in the opposite direction. If the hoisting drum 7 rotates in the opposite direction, the steel rope 8 between the hoisting drum 7 and the sliding form body 16 (or the concrete counterweight column 17) will become longer, causing the steel rope 8 to loosen between the hoisting drum 7 and the sliding form body 16 (or the concrete counterweight column 17), thereby failing to function as a safety rope and failing to prevent the sliding form body 16 from falling. The backstop assembly includes a backstop pawl disk 22 and a backstop pawl 14; the backstop pawl disk 22 is provided with a backstop outer ratchet gear 13, and the backstop outer ratchet gear 13 is located on the outer periphery of the backstop pawl disk 22. Among them, the backstop pawl disk 22 is fixed to the other side of the hoisting drum 7 (not on the same side as the inner ratchet wheel 6). Specifically, the backstop pawl disk 22 is locked to the hoisting drum 7 by a bolt 9. As Figure 2 and Figure 4 As shown, the anti-retraction pawl 14 is fixedly mounted on the fixed support 15. The anti-retraction outer ratchet gear 13 on the anti-retraction pawl disc 22 overlaps the anti-retraction pawl 14. Specifically, when the hoisting drum 7 rotates in the reverse direction, the anti-retraction pawl disc 22 located on the side wall of the hoisting drum 7 rotates in the reverse direction accordingly, but because the anti-retraction pawl 14 clamps the anti-retraction outer ratchet gear 13 on the anti-retraction pawl disc 22, it cannot rotate in this direction, and thus the hoisting drum 7 cannot rotate in the reverse direction either. When the hoisting drum 7 rotates forward, the anti-retraction pawl 14 slides along the anti-retraction outer ratchet gear 13 and does not prevent it from rotating. Therefore, when the steel rope 8 is wound around the hoisting drum 7 and subjected to force, the anti-retraction effect of the anti-retraction pawl 14 and the anti-retraction outer ratchet gear 13 prevents the steel rope 8 on the hoisting drum 7 from loosening.

[0040] In some preferred embodiments, a bearing 18 is mounted on each of the inner ratchet wheel 6 and the stop pawl plate 22 to fit tightly with the main shaft 1, so that the inner ratchet wheel 6 and the stop pawl plate 22 can rotate more flexibly, thereby allowing the winch drum 7 connected thereto to rotate flexibly.

[0041] In the present invention, there can be one or two pre-tightening self-locking devices 20. It is more secure if two pre-tightening self-locking devices 29 are respectively installed on both side ends of the sliding mold body 16.

Claims

1. A pre-tightening self-locking device for preventing the sliding formwork for pouring concrete of dam panels from falling, characterized in that: The device includes a fixed support, a main shaft, a winch drum, a safety steel rope, a pre-tightening assembly and a self-locking assembly; the fixed support is fixed on the side wall of the sliding formwork body or the concrete counterweight column on the dam top; the pre-tightening assembly includes an inner ratchet fixed wheel, a turbine and a pre-tightening spring which are sequentially sleeved on the main shaft; the pawl of the turbine is meshed with the inner ratchet of the inner ratchet fixed wheel; the self-locking assembly includes a self-locking pawl disk and an inner ratchet rotating wheel which are sequentially sleeved on the main shaft; the inner ratchet rotating wheel is meshed with the self-locking pawl disk; the pre-tightening spring has a spiral structure; the inner spring hook of the pre-tightening spring is fixedly connected to the pin shaft of the turbine; the outer spring hook of the pre-tightening spring is fixedly connected to the pin shaft of the self-locking pawl disk; one end of the safety steel rope is fixed on the winch drum and wound on the winch drum, the winch drum, the self-locking assembly and the pre-tightening assembly are sequentially connected and sleeved on the main shaft, and the two ends of the main shaft are fixedly connected to the fixed support.

2. The preload self-locking device according to claim 1, characterized in that: The pre-tightening self-locking device connects the sliding formwork body with the concrete counterweight column on the dam top through a safety steel rope.

3. The preload self-locking device according to claim 1, characterized in that: The winch drum is fixedly connected to the inner ratchet wheel through bolts.

4. The preload self-locking device according to claim 1, characterized in that: A manual lever is arranged on the inner ratchet wheel.

5. The preload self-locking device according to claim 1, characterized in that: A worm is provided on the turbine, and the worm is installed on the circumferential end surface of the worm wheel through thread engagement on the worm.

6. The preload self-locking device according to claim 1, characterized in that: The main shaft also includes a key pin; the inner ratchet fixed wheel is fixedly connected to the main shaft after engaging the key pin.

7. The preload self-locking device according to claim 1, characterized in that: It also includes a backstop assembly; the backstop assembly includes a backstop pawl plate and a backstop pawl; the backstop pawl plate is fixedly connected to the winch drum by bolts; an outer backstop ratchet gear is provided on the outer periphery of the backstop pawl plate; the outer backstop ratchet gear is fixed on one side of the winch drum; the backstop pawl is fixedly mounted on a fixed support.

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