Prestressed tendon threading device and silo prestressed tendon rapid construction method

Abstract

The application relates to a prestressed tendon threading device and a silo prestressed tendon rapid construction method. The prestressed tendon threading device comprises a threading channel and a lifting self-anchor connecting mechanism located in the threading channel. The lifting self-anchor connecting mechanism comprises a self-anchor locking frame. A steel wire rope self-locking head is arranged on the self-anchor locking frame. A fixing rod and a lifting rod are arranged on the self-anchor locking frame in the axial direction. One end of the fixing rod is fixed on the inner wall of the self-anchor locking frame, and the other end is provided with a fixing self-anchor ring. The lifting rod penetrates through the side wall of the self-anchor locking frame. A lifting self-anchor ring is arranged at the inner end of the lifting rod. A spring is sleeved on the lifting rod between the lifting self-anchor ring and the inner wall of the self-anchor locking frame. The application can realize bidirectional prestressed tendon rapid threading, greatly improves the slip form construction efficiency and continuity of the silo, and guarantees the quality of the silo construction.

Description

TECHNICAL FIELD

[0001] The present application relates to a prestressed silo steel strand construction technology, in particular to a prestressed tendon threading device and a silo prestressed tendon rapid construction method. BACKGROUND

[0002] The prestressed silo is a reinforced concrete structure of a circular silo, generally adopts slip form construction, is a continuous construction forming construction technology, and the common prestressed silo has a diameter of about 40m~60m. The construction process is generally as follows: firstly, measurement and lofting are performed, and components such as a slip form steel formwork, a lifting frame, a climbing support rod, a hydraulic jack, a slip form platform and a hydraulic lifting device are installed in place on the ground in advance; secondly, with the prestressed reinforcement laying of the silo wall, the wall reinforcement is bound, and the concrete is poured in layers every 30cm, the hydraulic lifting equipment is used to make it continuously slide upwards, and the cycle operation construction is performed until the silo top is reached. The prestressed silo construction increases the prestressed tendon threading process compared with the general silo, and the prestressed tendon threading is generally performed by manual threading or mechanical threading.

[0003] Manual threading: in the prestressed tendon construction process of the silo structure, the manual prestressed tendon threading and placing in the U-shaped measure tendon made of round steel are adopted by the construction workers. In the manual prestressed tendon threading process, multiple workers need to work together, the prestressed tendon is prone to friction and collision with the main tendon of the silo, the lifting frame and other components, the outer wall protection cover of the prestressed tendon is easily damaged, the number of workers for assisting the prestressed tendon threading is large, the threading time is long, and the construction efficiency is low.

[0004] Mechanical threading: in the prestressed tendon construction of the silo structure, the prestressed tendon is pulled to the specified position by using the prestressed tendon threading channel and the traction equipment, the prestressed tendon is taken out by the workers and placed in the U-shaped measure tendon, and the workers also need to manually pull the steel wire rope of the traction equipment to the prestressed tendon threading starting point and connect the prestressed tendon, so that the construction efficiency is low.

[0005] If the prestressed tendon threading, reinforcement binding and other construction processes cannot be completed in time during the construction process, the concrete of the silo wall and the buttress column may be pulled and cracked during the lifting of the slip form, thereby affecting the pouring quality of the buttress column and even the continuity of the slip form construction. SUMMARY

[0006] The purpose of the present application is to provide a prestressed tendon threading device and a silo prestressed tendon rapid construction method to solve the problem of low prestressed tendon threading efficiency in the prestressed tendon threading construction of the existing silo structure.

[0007] The application is implemented as follows: a prestressed tendon threading device, comprising a threading channel and a pulling self-anchoring connecting mechanism located inside the threading channel, the pulling self-anchoring connecting mechanism comprising a self-anchoring clamping frame, a steel wire rope self-locking head is arranged on the self-anchoring clamping frame, a fixing rod and a pulling rod are arranged on the self-anchoring clamping frame in the axial direction, one end of the fixing rod is fixed on the inner wall of the self-anchoring clamping frame, the other end of the fixing rod is provided with a fixing self-anchoring ring, the pulling rod passes through the side wall of the self-anchoring clamping frame, a pulling self-anchoring ring is arranged on the inner end of the pulling rod, and a spring is sleeved on the pulling rod between the pulling self-anchoring ring and the inner wall of the self-anchoring clamping frame.

[0008] Two protrusions are arranged on the outer wall of the self-anchoring clamping frame, the protrusions are located on the opposite sides of the pulling rod, and the steel wire rope self-locking head is arranged on the protrusions.

[0009] The fixing rod and the pulling rod are arranged alternately, and the fixing rod and the pulling rod each have at least two.

[0010] A anti-disengagement end head is arranged on the outer end of the pulling rod.

[0011] The threading channel is a semi-closed structure, and an inner protrusion is arranged on the inner side of the opening of the threading channel.

[0012] The application further discloses a silo prestressed tendon rapid construction method, which is realized based on the prestressed tendon threading device.

[0013] a. Bundling the silo wall reinforcement of the circular silo bottom and assembling the slip-form platform.

[0014] b. Installing a fixed sleeve on the slip-form portal on the outer side of the silo wall, and installing a threading channel between the two tensioning end buttress columns, wherein the threading channel is fixed by the fixed sleeve.

[0015] c. Installing a first power threading device and a second power threading device at the two tensioning end buttress columns respectively.

[0016] d. Artificially conveying the steel wire rope of the first power threading device from the threading channel to the buttress column close to the second power threading device, connecting the steel wire rope end head of the first power threading device and the steel wire rope end head of the second power threading device with the pulling self-anchoring connecting mechanism, and placing the pulling self-anchoring connecting mechanism in the threading channel.

[0017] e. Connecting the prestressed tendon end head with the pulling self-anchoring connecting mechanism.

[0018] f. Starting the first power threading device to positively pull the steel wire rope, and starting the second power threading device to reversely convey the steel wire rope, so as to thread the prestressed tendon through the threading channel.

[0019] g. After the prestressed tendon is placed in position, the first power threading device and the second power threading device are stopped, the prestressed tendon end is disconnected from the pulling self-anchoring connecting mechanism, the prestressed tendon is taken out from the opening of the threading channel and placed on the measure tendon of the silo wall.

[0020] h. The end of another prestressed tendon is connected with the pulling self-anchoring connecting mechanism at the buttress column close to the first power threading device, the second power threading device is started to positively pull the steel wire rope, and the first power threading device is started to reversely convey the steel wire rope, so as to thread the prestressed tendon through the threading channel.

[0021] i. After the prestressed tendon is placed in position, the first power threading device and the second power threading device are stopped, the prestressed tendon end is disconnected from the pulling self-anchoring connecting mechanism, the prestressed tendon is taken out from the opening of the threading channel and placed on the measure tendon of the silo wall, and the bidirectional prestressed threading construction is completed.

[0022] The silo prestressed tendon rapid construction method further comprises the following steps.

[0023] j. Pouring concrete on the wall part where the bidirectional prestressed threading construction is completed.

[0024] k. Raising the slip form and binding the wall reinforcement.

[0025] l. Repeating steps e~k until the construction of the entire wall is completed.

[0026] In step e, the pulling rod is pulled to make the center of the pulling self-anchoring ring and the fixed self-anchoring ring be located on the same straight line, the prestressed tendon is threaded through all the pulling self-anchoring rings and the fixed self-anchoring rings, and after the pulling rod is loosened, the pulling self-anchoring rings and the fixed self-anchoring rings are automatically staggered to fix the prestressed tendon.

[0027] The threading channel is composed of a plurality of arc segments, and the end of each arc segment is fixed in the fixed sleeve.

[0028] A stroke limiter is arranged at the end of the threading channel, and the first power threading device and the second power threading device stop running when the pulling self-anchoring connecting mechanism touches the stroke limiter.

[0029] The pulling self-anchoring connecting mechanism of the prestressed tendon threading device can realize rapid connection of the two-end steel wire ropes and the prestressed tendon, and can ensure the reliability of the connection. Under the traction of the one-end steel wire rope, the pulling self-anchoring connecting mechanism moves in the threading channel along the threading channel, so as to thread the prestressed tendon in the threading channel and realize rapid threading of the prestressed tendon. Since the two-end steel wire ropes can be used as traction ropes, bidirectional rapid threading of the prestressed tendon can be realized.

[0030] The silo prestressed tendon rapid construction method of the application uses a prestressed tendon threading device in the slip form construction process of the silo. Except that the steel wire of a power threading device needs to be manually threaded through the threading channel to the other end at the beginning, the remaining steel wire traction is realized by the power threading device, which saves manpower and greatly improves the threading efficiency. Since the lifting type self-anchoring connecting mechanism of the prestressed tendon threading device can quickly connect or detach the prestressed tendon, the prestressed tendon at the other end can be quickly threaded to this end and the prestressed tendon at this end can be quickly threaded to the other end, through the bidirectional prestressed tendon rapid threading, combined with the lifting of the slip form, so that the slip form construction efficiency of the prestressed silo can be greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the silo prestressed tendon rapid construction method of the application.

[0032] Figure 2 is Figure 1 A-A view of.

[0033] Figure 3 is a prestressed tendon threading diagram of the application.

[0034] Figure 4 is a structure diagram of the prestressed tendon threading device of the application.

[0035] Figure 5 is an end view of the prestressed tendon threading device of the application.

[0036] In the figure: 1, slip form platform; 2, slip form portal; 3, slip form climbing pole; 4, silo wall; 5, prestressed tendon; 6, first power threading device; 7, steel wire; 8, pulley; 9, first buttress column; 10, lifting type self-anchoring connecting mechanism; 11, fixed sleeve; 12, sleeve fixing device; 13, threading channel; 14, second buttress column; 15, second power threading device; 10-1, self-anchoring locking frame; 10-2, protruding block; 10-3, steel wire self-locking head; 10-4, fixed rod; 10-5, lifting rod; 10-6, fixed self-anchoring ring; 10-7, lifting self-anchoring ring; 10-8, spring; 13-1, inner protruding rib. DETAILED DESCRIPTION

[0037] The prestressed tendon 5 threading device of the application, as shown in Figure 4 , Figure 5 , includes a threading channel 13 and a lifting type self-anchoring connecting mechanism 10 inside the threading channel 13.

[0038] The self-anchoring connection mechanism 10 comprises a self-anchoring clamping frame 10-1, a steel wire rope self-locking head 10-3 is arranged on the self-anchoring clamping frame 10-1, a fixing rod 10-4 and a pulling rod 10-5 are arranged on the self-anchoring clamping frame 10-1 in the axial direction, one end of the fixing rod 10-4 is fixed on the inner wall of the self-anchoring clamping frame 10-1, the other end is provided with a fixing self-anchoring ring 10-6, the pulling rod 10-5 penetrates through the side wall of the self-anchoring clamping frame 10-1, a pulling self-anchoring ring 10-7 is arranged at the inner end of the pulling rod 10-5, and a spring 10-8 is sleeved on the pulling rod 10-5 between the pulling self-anchoring ring 10-7 and the inner wall of the self-anchoring clamping frame 10-1.

[0039] The self-anchoring clamping frame 10-1 has a certain length and is used for mounting the fixing rod 10-4 and the pulling rod 10-5. The self-anchoring clamping frame 10-1 can be a complete cylinder or a cylinder with an open side, and the cross section of the cylinder with an open side is in the shape of C. The cylinder with an open side is convenient for observing the position of the pulling self-anchoring ring 10-7.

[0040] Two protrusions 10-2 are arranged on the outer wall of the self-anchoring clamping frame 10-1, the protrusions 10-2 are located on the opposite sides of the pulling rod 10-5, and the steel wire rope self-locking head 10-3 is arranged on the protrusions 10-2.

[0041] The two protrusions 10-2 are respectively used for connecting the steel wire rope 7 of the first power threading device 6 and the steel wire rope 7 of the second power threading device 15, so the two protrusions 10-2 are respectively located at the two ends of the self-anchoring clamping frame 10-1.

[0042] The steel wire rope self-locking head 10-3 adopts an existing self-locking structure, for example, a tapered hole is formed in the protrusion 10-2, a plurality of petal bodies are arranged in the tapered hole, the petal bodies can be combined to form a frustum, the end of the steel wire rope 7 is located between the plurality of petal bodies, and when the steel wire rope 7 is subjected to a pulling force, the petal bodies move to the end with a smaller diameter of the tapered hole, so that the petal bodies lock the steel wire rope 7.

[0043] The fixing rod 10-4 and the pulling rod 10-5 are both perpendicular to the surface of the self-anchoring clamping frame 10-1, and all the fixing rods 10-4 and the pulling rods 10-5 are located on the same generatrix of the self-anchoring clamping frame 10-1.

[0044] The fixing rod 10-4 and the pulling rod 10-5 are arranged alternately, and there are at least two fixing rods 10-4 and at least two pulling rods 10-5. Figure 4As shown, the fixed rod 10-4 has two, and the pull rod 10-5 has three. When the prestressed tendon 5 passes through the front and rear staggered fixed self-anchor ring 10-6 and the pull self-anchor ring 10-7, under the action of the spring 10-8, the pull self-anchor ring 10-7 and the fixed self-anchor ring 10-6 are staggered in the height direction, and the prestressed tendon 5 is firmly fixed and fixedly locked by the friction between the pull self-anchor ring 10-7 and the prestressed tendon 5 and the friction between the fixed self-anchor ring 10-6 and the prestressed tendon 5.

[0045] In order to improve the friction between the pull self-anchor ring 10-7 and the prestressed tendon 5 and the friction between the fixed self-anchor ring 10-6 and the prestressed tendon 5, sharp protrusions are arranged on the inner circle of the pull self-anchor ring 10-7 and the fixed self-anchor ring 10-6.

[0046] The outer end of the pull rod 10-5 is provided with a anti-disengagement end, which can prevent it from disengaging from the side wall of the self-anchor locking frame 10-1 under the action of the spring 10-8 when the prestressed tendon 5 is not inserted.

[0047] The through-passage 13 is a semi-closed structure, and an inner protruding rib 13-1 is arranged on the inner side of the opening of the through-passage 13. The inner protruding rib 13-1 can prevent the pull type self-anchor connecting mechanism 10 from disengaging from the opening, and can limit the rotation of the pull type self-anchor connecting mechanism 10 in the through-passage, preventing the prestressed tendon 5 and the steel wire rope 7 from being wound together. The opening on the through-passage 13 is used to take out the whole from the side opening of the through-passage 13 after the prestressed tendon 5 is inserted in place.

[0048] The pull type self-anchor connecting mechanism 10 can realize the rapid connection of the two-end steel wire rope 7 and the prestressed tendon 5, and can ensure the reliability of the connection. Under the traction of the one-end steel wire rope 7, the pull type self-anchor connecting mechanism 10 moves in the through-passage 13 along the through-passage 13, so as to insert the prestressed tendon 5 in the through-passage 13, realizing the rapid insertion of the prestressed tendon 5. Since both ends of the steel wire rope 7 can be used as the traction rope, the bidirectional rapid insertion of the prestressed tendon 5 can be realized.

[0049] As shown in Figure 1 , Figure 2 and Figure 3 , the application also discloses a silo prestressed tendon 5 rapid construction method, which is realized based on the prestressed tendon 5 insertion device described above, and comprises the following steps.

[0050] a. Bundling the silo wall 4 steel bars of the circular silo bottom, and assembling the slip-form platform 1.

[0051] b. Install a fixed sleeve 11 on each of the slip-form scaffolds 2 outside the silo wall 4, and fix the fixed sleeve 11 below the slip-form scaffold 2 by means of a sleeve fixing device 12, and install a threading channel 13 between the two tensioning end buttresses (the first buttress 9 and the second buttress 14), and the threading channel 13 is fixed by the fixed sleeve 11.

[0052] c. Install a first power threading device 6 and a second power threading device 15 at the two tensioning end buttresses respectively.

[0053] The first power threading device 6 is located at the side of the first buttress 9, and the second power threading device 15 is located at the side of the second buttress 14.

[0054] d. Manually transfer the steel wire rope 7 of the first power threading device 6 from the threading channel 13 to the second buttress 14 close to the second power threading device 15, and connect the end of the steel wire rope 7 of the first power threading device 6 and the end of the steel wire rope 7 of the second power threading device 15 with the lifting self-anchoring connecting mechanism 10, and the lifting self-anchoring connecting mechanism 10 is placed in the threading channel 13.

[0055] At this time, the lifting self-anchoring connecting mechanism 10 is located in the port of the threading channel 13 at the second buttress 14.

[0056] e. Connect the end of the prestressed tendon 5 with the lifting self-anchoring connecting mechanism 10 from the second buttress 14.

[0057] f. Start the first power threading device 6 to positively pull the steel wire rope 7, and the second power threading device 15 to reversely deliver the steel wire rope 7, so as to thread the prestressed tendon 5 through the threading channel 13, and deliver the end of the prestressed tendon 5 to the first buttress 9.

[0058] g. After the prestressed tendon 5 is threaded in place, stop the first power threading device 6 and the second power threading device 15, disconnect the end of the prestressed tendon 5 from the lifting self-anchoring connecting mechanism 10, take out the prestressed tendon 5 from the opening of the threading channel 13, and place it on the measure tendon of the silo wall 4.

[0059] h. Connect the end of another prestressed tendon 5 with the lifting self-anchoring connecting mechanism 10 at the first buttress 9 close to the first power threading device 6, start the second power threading device 15 to positively pull the steel wire rope 7, and the first power threading device 6 to reversely deliver the steel wire rope 7, so as to thread the prestressed tendon 5 through the threading channel 13, and deliver the end of the prestressed tendon 5 to the second buttress 14.

[0060] i. After the prestressed tendon 5 is set, the first power threading device 6 and the second power threading device 15 are stopped, the prestressed tendon 5 is disconnected from the pulling self-anchoring connecting mechanism 10, the prestressed tendon 5 is taken out from the opening of the threading channel 13 and placed on the measure tendon of the silo wall 4, and the bidirectional prestressed threading construction is completed.

[0061] The above is the threading step of the prestressed tendon 5 of the application. The silo prestressed tendon 5 rapid construction method further comprises the following steps.

[0062] j. The silo wall 4 is partially poured with concrete after the bidirectional prestressed threading construction is completed. The construction of one layer of the silo is completed, and then the slip form is lifted for subsequent silo construction.

[0063] k. The slip form platform 1 is lifted to the next height along the slip form climbing pole 3, the slip form platform 1 is fixed, and the silo wall 4 reinforcement is bound.

[0064] l. Steps e~k are repeated until the construction of the entire silo wall 4 is completed.

[0065] In step e, the pulling rod 10-5 is pulled to make the center of the pulling self-anchoring ring 10-7 and the fixed self-anchoring ring 10-6 be located on the same straight line, the prestressed tendon 5 is threaded through all the pulling self-anchoring ring 10-7 and the fixed self-anchoring ring 10-6, and after the pulling rod 10-5 is loosened, the pulling self-anchoring ring and the fixed self-anchoring ring 10-6 are automatically misaligned to fix the prestressed tendon 5.

[0066] When the prestressed tendon 5 is detached from the pulling self-anchoring connecting mechanism 10, the pulling rod 10-5 is pulled to make the center of the pulling self-anchoring ring 10-7 and the fixed self-anchoring ring 10-6 be located on the same straight line, the pulling self-anchoring ring 10-7 and the fixed self-anchoring ring 10-6 are loosened to the prestressed tendon 5, and the prestressed tendon 5 is extracted from the pulling self-anchoring connecting mechanism 10.

[0067] A pulley 8 is arranged near the power threading device, and the power threading device enters the threading channel 13 through the pulley 8.

[0068] The power threading device can be a winch.

[0069] The threading channel 13 is composed of a plurality of arc segments, and the end of each arc segment is fixed in the fixed sleeve 11.

[0070] A stroke limiter is arranged at the end of the threading channel 13, and when the pulling self-anchoring connecting mechanism 10 touches the stroke limiter, the first power threading device 6 and the second power threading device 15 stop running. Then the power threading device is manually controlled to adjust the threading length of the prestressed tendon 5.

[0071] The method is used for the prestressed steel bar 5 threading construction. Except that the steel wire rope 7 of a power threading device needs to be manually threaded through the threading channel 13 to the other end at the beginning, the remaining steel wire rope 7 traction is realized by the power threading device, which saves manpower and greatly improves the threading efficiency.

[0072] With the rising of the slip-form platform 1, the bidirectional threading of the prestressed steel bar 5 can be continuously completed, which greatly improves the slip-form construction efficiency and continuity of the silo, thereby ensuring the quality of the silo construction.

Claims

1. A tendon threading device, characterized in that The self-anchoring connection mechanism comprises a self-anchoring locking frame, a steel wire rope self-locking head is arranged on the self-anchoring locking frame, a fixing rod and a pulling rod are arranged on the self-anchoring locking frame in the axial direction, one end of the fixing rod is fixed on the inner wall of the self-anchoring locking frame, the other end of the fixing rod is provided with a fixing self-anchoring ring, the pulling rod passes through the side wall of the self-anchoring locking frame, a pulling self-anchoring ring is arranged on the inner end of the pulling rod, and a spring is sleeved on the pulling rod between the pulling self-anchoring ring and the inner wall of the self-anchoring locking frame.

2. The tendon threading device of claim 1, wherein Two protrusions are arranged on the outer wall of the self-anchoring locking frame, the protrusions are located on the opposite sides of the pulling rod, and the steel wire rope self-locking head is arranged on the protrusions.

3. The tendon threading device of claim 1, wherein The fixing rod and the pulling rod are arranged alternately, and the fixing rod and the pulling rod are at least two respectively.

4. The tendon threading device of claim 1, wherein A anti-disengagement end head is arranged on the outer end of the pulling rod.

5. The tendon threading device of claim 1, wherein, The threading channel is a semi-closed structure, and an inner protrusion is arranged on the inner side of the opening of the threading channel.

6. A method for rapid construction of prestressed tendons in silos, implemented on the basis of the tendon threading device according to any one of claims 1 to 5, characterized in that, The method comprises the following steps: a. binding the warehouse wall reinforcement of the circular silo bottom and assembling the slip-form platform; b. installing a fixed sleeve on the slip-form portal on the outer side of the silo warehouse wall, installing a threading channel between the two tensioning end buttress columns, and fixing the threading channel by the fixed sleeve; c. installing a first power threading device and a second power threading device at the two tensioning end buttress columns respectively; d. manually conveying the steel wire rope of the first power threading device from the threading channel to the buttress column close to the second power threading device, connecting the steel wire rope end head of the first power threading device and the steel wire rope end head of the second power threading device with the self-anchoring connection mechanism, and placing the self-anchoring connection mechanism in the threading channel; e. connecting the prestressed tendon end head with the self-anchoring connection mechanism; f. starting the first power threading device to positively pull the steel wire rope, and starting the second power threading device to reversely convey the steel wire rope, so as to thread the prestressed tendon through the threading channel; g. after the prestressed tendon is threaded in place, stopping the first power threading device and the second power threading device, disconnecting the prestressed tendon end head from the self-anchoring connection mechanism, taking out the prestressed tendon from the opening of the threading channel, and placing the prestressed tendon on the measure tendon of the silo warehouse wall; h. connecting the end head of another prestressed tendon with the self-anchoring connection mechanism at the buttress column close to the first power threading device, starting the second power threading device to positively pull the steel wire rope, and starting the first power threading device to reversely convey the steel wire rope, so as to thread the prestressed tendon through the threading channel; i. after the prestressed tendon is threaded in place, stopping the first power threading device and the second power threading device, disconnecting the prestressed tendon end head from the self-anchoring connection mechanism, taking out the prestressed tendon from the opening of the threading channel, and placing the prestressed tendon on the measure tendon of the silo warehouse wall, and completing the bidirectional prestressed threading construction.

7. The method of claim 6, wherein the method further comprises: The method further comprises the following steps: j. pouring concrete on the warehouse wall part after the bidirectional prestressed threading construction is completed; k. lifting the slip-form and binding the warehouse wall reinforcement; l. repeating steps e-k until the construction of the entire warehouse wall is completed.

8. The method of claim 6, wherein the method further comprises: In step e, pulling the pull rod makes the pull self-anchor ring and the fixed self-anchor ring have the same center line, the prestressed tendon is passed through all the pull self-anchor rings and the fixed self-anchor rings, and after the pull rod is loosened, the pull self-anchor ring and the fixed self-anchor ring are automatically staggered to fix the prestressed tendon.

9. The method of claim 6, wherein the method further comprises: The threading channel is composed of a plurality of arc segments, and the end of each arc segment is fixed in the fixed sleeve.

10. The method of claim 6, wherein the method further comprises: A stroke limiter is arranged at the end of the threading channel, and the first power threading device and the second power threading device stop running when the pull type self-anchor connecting mechanism touches the stroke limiter.

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