CN114382230B

CN114382230B - Prestressed beam structure and construction method thereof

Info

Publication number: CN114382230B
Application number: CN202210090546.5A
Authority: CN
Inventors: 柯清堂; 沈丽娟; 林正旺
Original assignee: China Construction Lugang Construction Co ltd
Current assignee: China Construction Lugang Construction Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2023-04-14
Anticipated expiration: 2042-01-25
Also published as: CN114382230A

Abstract

The application relates to a prestressed beam structure and a construction method thereof, the prestressed beam structure comprises a beam body, corrugated pipes arranged in a curve manner are pre-buried in the beam body, steel strands are arranged inside the corrugated pipes in a penetrating manner, aiming plates are arranged at two ends of the corrugated pipes, one side, close to the corrugated pipes, of each aiming plate is installed at the end part of the beam body, one side, far away from the beam body, of each aiming plate is provided with an operating groove, aiming holes for the steel strands to penetrate are formed in the bottom of each operating groove, the aperture of each aiming hole is gradually increased from one end, close to the beam body, to the other end, at least two first clamping pieces are wound on the steel strands at intervals, each first clamping piece is in an arc shape and surrounds the steel strands, connecting ropes are sleeved on the steel strands, arc grooves for the connecting ropes to be placed are formed in the first clamping pieces, one side, far away from the steel strands, is obliquely arranged on the inner wall, operation ports communicated with the inside of the operating grooves are formed in the periphery of the aiming plates, and penetrate one side, far away from the beam body, of the beam body, and the operating ports penetrate through the aiming plates. The method has the effect of reducing the error between the size of the prestress of the beam body and the size of the pre-designed prestress.

Description

Prestressed beam structure and construction method thereof

Technical Field

The application relates to the field of constructional engineering, in particular to a prestressed beam structure and a construction method thereof.

Background

The construction process of the prestressed beam comprises a pre-tensioning method and a post-tensioning method. The pre-tensioning method is simple in construction and is generally applied to industrial production of small and medium-sized components. And the post-tensioning method is generally applied to the industrial production of large components.

The post-tensioning construction process comprises the following steps: binding the steel bars of the beam body and installing the corrugated pipe; a steel strand is penetrated in the corrugated pipe, and an aiming plate and a clamping piece are arranged at two ends of the steel strand; erecting a template on the steel bars of the beam body and then pouring concrete; after the concrete reaches a certain strength, putting the jack, the auxiliary sighting device and the auxiliary clamp into the steel strand, starting the jack, and pushing the auxiliary sighting device and the sighting plate to be away from each other by the jack so as to stretch the steel strand, wherein the jack is a cylindrical jack; after the steel strand is stretched, closing the jack, and then taking down the jack, the auxiliary sighting telescope and the auxiliary clamp; and pouring concrete into the corrugated pipe, and sealing and aiming. The sealing and aiming are that an aiming plate exposed outside the beam body and the steel strand are wrapped by concrete.

In view of the above-mentioned related technologies, the inventor believes that the jack releases the steel strand after stretching the steel strand, and the steel strand retracts, thereby driving the clamping piece to enter the hole inside the panel, and then the clamping piece clamps the steel strand. And the steel strand retracts, so that the error between the prestress of the beam body and the pre-designed prestress is increased.

Disclosure of Invention

In order to reduce the error between the magnitude of the prestress of the beam body and the magnitude of the pre-designed prestress, the application provides a prestressed beam structure and a construction method thereof.

The application provides a prestressed beam structure and a construction method thereof, which adopts the following technical scheme:

the utility model provides a prestressed beam structure, includes the roof beam body, the internal pre-buried bellows that is the curve setting that has of roof beam, corrugated pipe wears to be equipped with steel strand wires in the inside, the both ends of corrugated pipe are provided with aims the board, aim one side that the board is close to the bellows and install in the tip of the roof beam body, aim one side that the roof beam body was kept away from to the board and seted up the operation groove, the tank bottom in operation groove is seted up and is supplied the aiming hole that steel strand wires wore to establish, aim the aperture in hole and crescent to the other end by the one end that is close to the roof beam body, steel strand wires interval is around there being two at least first clamping pieces, first clamping piece is the arc and surrounds steel strand wires, the steel strand wires cover is equipped with the connection rope, the arc groove that supplies the connection rope to place is seted up to first clamping piece, the lopsidedness that steel strand wires was kept away from to first clamping piece sets up and is used for the laminating to aim the inner wall in hole, aim the week side of board and set up the operation mouth with the inside intercommunication of operation groove, operation mouth runs through and aims one side that the board and keeps away from the roof beam body.

Through adopting above-mentioned technical scheme, after tensile steel strand wires, supply the construction of constructor through operation mouth and standing groove. And pushing the first clamping piece into the aiming hole. The first clamping piece gradually clamps the steel strand as the aperture of the aiming hole gradually increases from one end close to the beam body to the other end along with the first clamping piece entering the aiming hole. And then, after the jack is closed, the first clamping piece clamps the steel strand, so that the retraction length of the steel strand is reduced, and the error between the prestress of the beam body and the predesigned prestress is reduced.

Each of the first clip pieces is connected to each other by a connecting string so that each clip piece surrounds the periphery of the steel strand. Each clamping piece surrounds the periphery of the steel strand, so that the situation that the clamping pieces fall off from the steel strand after being pulled out from the aiming hole when the steel strand is stretched is reduced. The arc groove is used for placing the connection rope to reduce and connect the rope and keep away from steel strand wires one side protrusion and influence the condition appearance that first clamping piece inserted the sighting hole from first clamping piece.

Optionally, a limiting plate has been placed to the operation inslot portion, one side fixed mounting that the limiting plate is close to the roof beam body has the first sleeve that supplies steel strand wires to wear to establish, first sleeve runs through the limiting plate, first telescopic inner wall supports pastes in steel strand wires, first sleeve is worn to locate inside the sighting hole.

Through adopting above-mentioned technical scheme, after tensile steel strand wires, promote the limiting plate, the first sleeve of limiting plate removes, and inside first sleeve drove first clamping piece entering sighting hole. Drive inside first clamping piece gets into the sighting hole through first sleeve to make things convenient for the constructor to once only push back inside the sighting hole with all clamping pieces.

Optionally, a pressing plate is arranged inside the operation port, one side of the pressing plate is fixedly connected with the peripheral side wall of the limiting plate, and the other side of the pressing plate extends out of the peripheral side of the sighting plate along the operation port.

Through adopting above-mentioned technical scheme, promote the clamp plate to drive the limiting plate and remove. The pressing plate extends out of the periphery of the sighting plate, so that the construction personnel can conveniently push the limiting plate to move.

Optionally, a supporting block is arranged on one side, close to the beam body, of the pressing plate, the supporting block is fixedly installed on the peripheral side wall of the aiming plate, a screw hole is formed in the supporting block, a bolt is arranged in the screw hole in a matched mode, and a first through hole for the bolt to penetrate through is formed in the pressing plate.

Through adopting above-mentioned technical scheme, after jack tensioning steel strand wires, the bolt passes inside screw in screw behind the first through-hole. The bolt is constantly screwed into the screw hole, so that the limiting plate is driven to move towards the aiming plate, and the first clamping piece is pushed into the aiming hole by the first sleeve. After the jack is taken down, the bolt is screwed again, and the number of turns of the bolt which can be screwed again is reduced, so that the construction personnel can conveniently know the retraction length of the steel strand. When the length of the steel strand retraction is too long and the prestress of the beam body is not in accordance with the requirement, a constructor can re-stretch the steel strand, so that the situation that the error between the prestress of the beam body and the pre-designed prestress is large is reduced.

Optionally, the steel strand wires interval is surrounded there are two at least second clamping pieces, the second clamping piece is the arc and surrounds the steel strand wires, the steel strand wires cover is equipped with the second sleeve, second sleeve fixed mounting keeps away from the one side of the roof beam body in the limiting plate, the telescopic internal diameter of second reduces to the other end by the one end of keeping away from the limiting plate gradually, the one side slope that the steel strand wires were kept away from to the second clamping piece sets up and is used for laminating the telescopic inner wall of second, the second clamping piece is located the one side that the roof beam body was kept away from to the limiting plate.

Through adopting above-mentioned technical scheme, after first clamping piece presss from both sides tight steel strand wires, put into the second sleeve with the second clamping piece inside, along with the second clamping piece gets into inside the second sleeve, the internal diameter of second sleeve reduces gradually to make first and the clamping piece presss from both sides tight steel strand wires gradually. The steel strand is clamped through the second clamping piece, so that the situation that the steel strand retracts is reduced.

Optionally, the steel strand wires cover is equipped with the third sleeve, threaded connection between the outer wall of third telescopic inner wall and second sleeve, the inner wall fixed mounting that the one end of the roof beam body was kept away from to the third sleeve has the spacing ring, the inner wall of spacing ring supports pastes in the steel strand wires, one side damping that the roof beam body was kept away from to the second clamping piece is pegged graft and is had the bracing piece, the second through-hole that supplies the bracing piece to wear to establish is seted up to the spacing ring, the one end fixed mounting that the second clamping piece was kept away from to the bracing piece has the stopper.

Through adopting above-mentioned technical scheme, when putting into the jack steel strand wires tensile, to with the second sleeve part of third sleeve screw in to make the third sleeve fix at the second sleeve, and inside the second clamping piece did not get into the second sleeve. After the steel strand is stretched by the jack, the third sleeve is directly rotated, the third sleeve drives the limiting ring to move towards the second sleeve, and the limiting ring drives the second clamping piece to enter the second sleeve to clamp the steel strand. The bracing piece damping is pegged graft in the second clamping piece, and when the second clamping piece got into the sleeve inside, the frictional force increase between second clamping piece and the steel strand wires to make the bracing piece extract from the second clamping piece. Promote the second clamping piece through the third sleeve and get into the second sleeve to make things convenient for constructor to promote the chucking of second clamping piece inside the second sleeve. The bracing piece is used for temporarily fixing the second clamping piece to when reducing the tensile steel strand, the condition that the second clamping piece dropped from the steel strand appears.

Optionally, the first clamping piece and the second clamping piece are provided with anti-slip lines on the side close to the steel strand.

Through adopting above-mentioned technical scheme, first clamping piece and second clamping piece are tight the back with the steel strand wires clamp, through anti-skidding line increase frictional force to the condition that the steel strand wires retract is reduced and appears.

Optionally, the equal fixed mounting in both ends of bellows has the backing plate, steel strand wires run through the backing plate, the spring muscle is installed to one side that the backing plate is close to the bellows, the bellows is located to the spring muscle cover, aim board fixed mounting in the backing plate keep away from one side of bellows, backing plate and spring muscle all are located the inside of roof beam body.

Through adopting above-mentioned technical scheme, the backing plate is used for supporting and aims the board, and when tensile steel strand wires, jack is to aiming the board and exert pressure, aims the board and will exert the power dispersion at the roof beam body through the backing plate, and the spring muscle is used for improving the local compressive strength of the roof beam body to reduce the roof beam body and receive the extrusion of aiming the board and the condition of fracture appears.

Optionally, the outer walls of the two ends of the corrugated pipe are fixedly provided with first grouting pipes, one end of each first grouting pipe is communicated with the inside of the corrugated pipe, the other end of each first grouting pipe is fixedly installed on the corresponding backing plate, one side, away from the first grouting pipe, of each backing plate is provided with a second grouting pipe, the second grouting pipes are communicated with one ends, away from the corrugated pipe, of the first grouting pipes, the second grouting pipes are provided with valves, the outer wall of the corrugated pipe is fixedly provided with a plurality of inspection pipes, one ends of the inspection pipes are communicated with the inside of the corrugated pipe, and the inspection pipes are arranged at intervals along the length direction of the corrugated pipe.

Through adopting above-mentioned technical scheme, open the valve, to second slip casting pipe injection concrete, the concrete gets into first slip casting pipe from second slip casting pipe, later gets into inside the bellows. And after the concrete overflows from the inspection tube, the inspection tube is blocked. And pouring concrete into the corrugated pipe after each inspection pipe is plugged. Concrete overflows through the inspection tube to make things convenient for constructor to look over whether the corrugated pipe is inside to be full of the concrete.

Optionally, the steps are as follows: s1, binding beam body steel bars, and installing corrugated pipes; s2, penetrating steel strands into the corrugated pipe; s3, sequentially mounting spiral ribs, a base plate and an aiming plate at two ends of the steel strand, mounting a first grouting pipe and a second grouting pipe at two ends of the corrugated pipe, and mounting inspection pipes at intervals along the length direction of the corrugated pipe; s4, erecting a template along the reinforcing steel bars of the beam body and pouring concrete of the beam body; s5, tensioning the steel strand, which comprises the following steps: s501, sequentially placing the first clamping piece, the limiting plate, the jack, the auxiliary sight and the auxiliary clamp into the steel strand; s502, starting a jack to stretch a steel strand; s503, the bolt penetrates through the first through hole and then is screwed into the screw hole, and the first sleeve pushes the first clamping piece to enter the aiming hole to clamp the steel strand; s504, rotating a third sleeve, and driving a second clamping piece to enter the second sleeve to clamp the steel strand by the third sleeve; s505, closing the jack, and taking down and recycling the jack, the auxiliary sighting device and the auxiliary clamp; s506, screwing the bolt and the third sleeve again; s6, pouring concrete into the second grouting pipe, and the method comprises the following steps: s601, opening a valve, and pouring concrete into the second grouting pipe; s602, sealing the inspection pipe after the concrete overflows from the inspection pipe; s603, pouring concrete into the second grouting pipe after each inspection pipe is sealed; and S7, sealing and aiming.

Through adopting above-mentioned technical scheme, first clamping piece and second clamping piece press from both sides the steel strand wires tightly, can promote inside first clamping piece gets into the sighting hole simultaneously to reduce the prestressing force size of the roof beam body and the error of the prestressing force size of predesigned.

In summary, the present application includes at least one of the following beneficial technical effects:

1. after the steel strand is stretched by the jack, an operation space for an operator to push the first clamping piece to enter the aiming hole is formed through the operation opening and the operation groove, after the operator pushes the first clamping piece into the aiming hole to clamp the steel strand, the jack is closed, and the first clamping piece clamps the steel strand, so that the retraction length of the steel strand is reduced, and the error between the prestress of the beam body and the pre-designed prestress is reduced;

2. the bolts are screwed so as to drive the limiting plates to push the first clamping pieces into the aiming holes, so that each first clamping piece can be conveniently pushed into the aiming holes by constructors at one time, meanwhile, after the jack is closed, the bolts are screwed again, the retraction length of the steel strand is known through the number of turns of the bolt, and when the retraction length of the steel strand is too long and the prestress of the beam body does not meet the design requirements, the constructors can timely re-stretch the steel strand;

3. the pressure applied to the beam body by the aiming plate is dispersed through the backing plate, and the local pressure resistance of the beam body is increased through the spring ribs, so that the condition that the beam body is fractured by the aiming plate is reduced.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic diagram of a portion of an embodiment of the present application;

FIG. 3 is a cross-sectional view of an embodiment of the present application taken along a radial direction of the bellows;

FIG. 4 is a schematic structural diagram of an address plate of an embodiment of the present application;

fig. 5 is a schematic structural diagram of a limiting plate according to an embodiment of the application;

FIG. 6 is an exploded view of an embodiment of the present application;

FIG. 7 is a schematic view of a first clip of an embodiment of the present application;

FIG. 8 is a schematic structural view of a second clip according to an embodiment of the present application;

FIG. 9 is a schematic block diagram of an embodiment of the present application;

FIG. 10 is a schematic block diagram of a construction of a tension steel strand according to an embodiment of the present application;

fig. 11 is a schematic block diagram illustrating a construction of pouring concrete into the second grouting pipe according to the embodiment of the present invention.

Description of the reference numerals: 1. a beam body; 2. a bellows; 3. steel strand wires; 4. a spring rib; 5. a backing plate; 6. a first through hole; 7. a second through hole; 8. an inspection tube; 9. an aiming plate; 10. an operation slot; 11. an operation port; 12. aiming holes; 13. a limiting plate; 14. a first sleeve; 15. a second sleeve; 16. a third sleeve; 17. pressing a plate; 18. a support block; 19. a screw hole; 20. a bolt; 21. a first clip; 22. a second clip; 23. an arc groove; 24. connecting ropes; 25. a limiting ring; 26. a limiting block; 27. a support bar; 28. a first grouting pipe; 29. a second grouting pipe; 30. and (4) a valve.

Detailed Description

The present application is described in further detail below with reference to figures 1-11.

The embodiment of the application discloses a prestressed beam structure and a construction method thereof.

Referring to fig. 1 and 2, the prestressed beam structure includes a beam body 1, and a corrugated pipe 2 arranged in a curve is pre-embedded in the beam body 1. The corrugated pipe 2 is provided with steel strands 3 in a penetrating manner. The both ends of bellows 2 all are equipped with spring muscle 4, and the both ends of bellows 2 still fixed mounting have backing plate 5, and spring muscle 4 fixed mounting is in one side that backing plate 5 is close to bellows 2. The steel strand 3 penetrates through the backing plate 5, and the aiming plate 9 is fixedly mounted on one side, far away from the spring rib 4, of the backing plate 5. The spring ribs 4 and the backing plate 5 are both positioned inside the beam body 1, and the sighting plate 9 is embedded at the end part of the beam body 1.

The spring ribs 4 are used for increasing the pressure resistance of the two ends of the beam body 1, and the backing plate 5 is used for dispersing the pressure applied by the aiming plate 9, so that the condition that the beam body 1 is fractured by the aiming plate 9 is reduced.

Referring to fig. 3 and 4, an operation slot 10 is formed in one side of the aiming plate 9, which is far away from the backing plate 5, an aiming hole 12 through which the steel strand 3 passes is formed in the bottom of the operation slot 10, and the aperture of the aiming hole 12 gradually increases from one end close to the beam body 1 to the other end.

Referring to fig. 3 and 5, a limiting plate 13 is placed inside the operation groove 10, a first sleeve 14 is fixedly installed on one side of the limiting plate 13 close to the beam body 1, and a second sleeve 15 is fixedly installed on the other side. The steel strand 3 passes through the first sleeve 14 and the second sleeve 15. The first sleeve 14 penetrates the limiting plate 13 and is communicated with the interior of the second sleeve 15. The inner wall of the first sleeve 14 is abutted against the steel strand 3, and the first sleeve 14 is arranged in the sighting hole 12 in a penetrating mode.

Referring to fig. 4, 5 and 6, an operation opening 11 is formed in an inner side wall of the operation slot 10. A pressure plate 17 is placed inside the operation port 11. One side of the pressure plate 17 is fixedly connected with the peripheral side of the limit plate 13, and the other side of the pressure plate 17 extends from the peripheral side of the sighting plate 9 along the operation opening 11. One side of the pressing plate 17 close to the beam body 1 is provided with a supporting block 18, the supporting block 18 is fixedly installed on the peripheral side wall of the sighting plate 9, and the supporting block 18 is provided with a screw hole 19. The screw hole 19 is provided with a bolt 20 in a matching way, and the pressing plate 17 is provided with a first through hole 6 for the bolt 20 to penetrate through.

Referring to fig. 6 and 7, at least two first clamping pieces 21 are wound around the steel strand 3 at intervals, and the first clamping pieces 21 surround the steel strand 3 in an arc shape. The steel strand 3 is equipped with the connection rope 24 in a cover way, and the arc groove 23 that supplies the connection rope 24 to place is seted up to first clamping piece 21. The first clamping piece 21 is positioned on one side of the limiting plate 13 close to the beam body 1. The connecting rope 24 enters the arc groove 23 to connect the first clamping pieces 21 on the same steel strand 3 with each other, thereby reducing the occurrence of the situation that the first clamping pieces 21 fall off the steel strand 3. Meanwhile, the connecting rope 24 enters the arc groove 23, so that the situation that the connecting rope 24 protrudes from the side, away from the steel strand 3, of the first clamping piece 21 is reduced.

After the steel strand 3 is tensioned by the jack, the bolt 20 is inserted through the first through hole 6 and screwed into the screw hole 19. When the bolt 20 is screwed into the screw hole 19, the pressing plate 17 is driven to move towards the beam body 1, and the pressing plate 17 drives the limiting plate 13 to move towards the beam body 1. The inner wall of the first sleeve 14 abuts against the steel strand 3, so that when the first sleeve 14 moves towards the beam body 1 along with the limiting plate 13, the first sleeve 14 pushes the first clamping piece 21 to enter the sighting hole 12. The inside diameter of the inside of the aiming hole 12 is gradually reduced so that the first clamping piece 21 gradually clamps the steel strand 3.

After the steel strand 3 is tensioned by the jack, a constructor can push the first clamping piece 21 into the sighting hole 12, so that the length of the steel strand 3 driving the first clamping piece 21 to retract is reduced, and the error between the prestress of the beam body 1 and the predesigned prestress is reduced. The bolt 20 is screwed into the screw hole 19, and the limiting plate 13 drives each first clamping piece 21 to enter the sighting hole 12, so that a constructor can conveniently insert the first clamping pieces 21 into the sighting hole 12.

Referring to fig. 6 and 8, at least two second clamping pieces 22 are arranged around the steel strand 3 at intervals, and the second clamping pieces 22 surround the steel strand 3 in an arc shape. The second clamping piece 22 is located on one side of the limiting plate 13 away from the beam body 1, and the second clamping piece 22 penetrates through the second sleeve 15. The inner diameter of the second sleeve 15 is gradually reduced from one end far away from the limiting plate 13 to the other end, and one side of the second clamping piece 22 far away from the steel strand 3 is obliquely arranged to be attached to the inner wall of the second sleeve 15.

The second sleeve 15 is provided with a third sleeve 16, and the inner wall of the third sleeve 16 is in threaded connection with the outer wall of the second sleeve 15. The inner wall of one end, away from the limiting plate 13, of the third sleeve 16 is fixedly provided with a limiting ring 25, and the inner wall of the limiting ring 25 abuts against the steel strand 3. The damping of one side of the second clamping piece 22 far away from the beam body 1 is inserted with a support rod 27, and the limit ring 25 is provided with a second through hole 7 for the support rod 27 to penetrate. The second support rod 27 has elasticity, and a limit block 26 is fixedly mounted at one end of the support rod 27 far away from the second clamping piece 22.

After the bolt 20 is screwed into the screw hole 19 and the first clamping piece 21 clamps the steel strand 3, the third sleeve 16 is rotated. The third sleeve 16 drives the second clip 22 into the second sleeve 15 through the stop ring 25. The second clamping piece 22 clamps the steel strand 3 after entering the second sleeve 15, so that the retraction length of the steel strand 3 is reduced, and the error between the pre-stress of the beam body 1 and the pre-designed pre-stress is reduced.

The support rod 27 is used to temporarily fix the second jaw 22, so that the support rod 27 is pulled out from the second jaw 22 by rotating the third sleeve 16 after the friction between the second jaw 22 and the steel strand 3 is large to a certain degree. The second clip 22 is temporarily fixed by the support rod 27, thereby reducing the occurrence of the second clip 22 dropping when the steel strand 3 is tensioned. The third sleeve 16 facilitates the insertion of the second clip 22 inside the second sleeve 15 by the operator.

The side of the first clamping piece 21 close to the steel strand 3 and the side of the second clamping piece 22 close to the steel strand 3 are both provided with anti-skid grains. The anti-slip patterns are used for increasing the friction force of the first clamping piece 21 and the second clamping piece 22 after clamping the steel strand 3, so that the condition that the steel strand 3 retracts is reduced, and the error between the pre-stress size of the beam body 1 and the pre-designed pre-stress size is reduced.

Referring to fig. 1 and 2, the outer walls of the two ends of the corrugated pipe 2 are fixedly provided with first grouting pipes 28, one end of each first grouting pipe 28 is communicated with the inside of the corrugated pipe 2, and the other end of each first grouting pipe 28 is fixedly arranged on the backing plate 5. The side of the backing plate 5 remote from the first grout tube 28 is provided with a second grout tube 29. The second grouting pipe 29 is communicated with one end of the first grouting pipe 28 far away from the corrugated pipe 2, and the second grouting pipe 29 is provided with a valve 30. A plurality of inspection tubes 8 are fixedly mounted on the outer wall of the corrugated pipe 2, and one ends of the inspection tubes 8 are communicated with the interior of the corrugated pipe 2. The inspection tubes 8 are spaced apart along the length of the bellows 2.

The two valves 30 are opened and then concrete is poured into the second pipe 29, along the second pipe 29 into the first pipe 28 and into the bellows 2. The inspection pipes 8 are plugged after concrete overflows from each inspection pipe 8. Valve 30 is then closed, thereby completing the pouring of concrete into the interior of bellows 2. Inspection tube 8 facilitates the constructor to know whether the concrete inside bellows 2 is filled.

Referring to fig. 9, 10, and 11, an embodiment of the present application further discloses a construction method of a prestressed beam structure, including the following steps:

s1, binding reinforcing steel bars of a beam body 1, and installing a corrugated pipe 2.

S2, inserting steel strands 3 into the corrugated pipe 2; before the steel strand 3 passes through the corrugated pipe 2, the end part of the steel strand 3 can be temporarily wrapped with soft substances such as cloth, sponge and the like, and the steel strand 3 is separated from the inner wall of the corrugated pipe 2 through the soft substances, so that the situation that the corrugated pipe 2 is scratched in the process that the steel strand 3 passes through the corrugated pipe 2 is reduced. After the steel strands 3 have passed through the corrugated tube 2, the soft material is removed from the steel strands 3.

And S3, sequentially mounting spiral ribs, a backing plate 5 and an aiming plate 9 at two ends of the steel strand 3, mounting a first grouting pipe 28 and a second grouting pipe 29 at two ends of the corrugated pipe 2, and mounting inspection pipes 8 at intervals along the length direction of the corrugated pipe 2.

And S4, erecting a template along the steel bars of the beam body 1 and pouring concrete of the beam body 1.

S5, tensioning the steel strand 3, which comprises the following steps:

s501, sequentially placing the first clamping piece 21, the limiting plate 13, the jack, the auxiliary sighting telescope and the auxiliary clamp into the steel strand 3; the jack is the tube-shape, and after steel strand wires 3 passed through the jack inside, steel strand wires 3 continued to pass through supplementary sighting device, and later supplementary anchor clamps pressed from both sides steel strand wires 3 tightly.

S502, starting a jack to stretch the steel strand 3; the jack pushes the sighting plate 9 and the sighting device, so that the steel strand 3 is tensioned.

S503, the bolt 20 penetrates through the first through hole 6 and then is screwed into the screw hole 19, and the first sleeve 14 pushes the first clamping piece 21 into the aiming hole 12 to clamp the steel strand 3.

S504, rotating the third sleeve 16, wherein the third sleeve 16 drives the second clamping piece 22 to enter the second sleeve 15 to clamp the steel strand 3;

and S505, closing the jack, and taking down the jack, the auxiliary sighting device and the auxiliary clamp for recovery.

S506, the bolt 20 and the third sleeve 16 are screwed again, and a constructor knows the retraction amount of the steel strand 3 according to the rotation angle of the bolt 20 and the third sleeve 16, and needs to re-stretch the steel strand 3 when the steel strand 3 retracts to enable the prestress of the beam body 1 to be not in accordance with the design requirement, so that the error between the prestress of the beam body 1 and the pre-designed prestress is reduced.

S6, pouring concrete into the second grouting pipe 29, and the method comprises the following steps:

s601, opening the valve 30, and pouring concrete into the second grouting pipe 29.

And S602, sealing the inspection pipe 8 after the concrete overflows from the inspection pipe 8.

And S603, pouring concrete into the second grouting pipe 29 after each inspection pipe 8 is sealed.

And S7, sealing and aiming. Concrete is poured at two ends of the beam body 1, and the sighting plate 9, the limiting plate 13, the first clamping piece 21 and the second clamping piece 22 are protected through the concrete.

The implementation principle of the prestressed beam structure and the construction method thereof in the embodiment of the application is as follows: after the steel strand 3 is tensioned by the jack, the bolt 20 is used to pass through the first through hole 6 and then screwed into the screw hole 19. The bolt 20 drives the pressing plate 17 to move towards the beam body 1, the pressing plate 17 drives the limiting plate 13 to move towards the beam body 1, the limiting plate 13 pushes the first clamping piece 21 to enter the sighting hole 12 through the first sleeve 14, and the first clamping piece 21 clamps the steel strand 3 tightly. Then, the third sleeve 16 is rotated, and the third sleeve 16 drives the second clamping piece 22 to be inserted into the second sleeve 15 through the limiting ring 25, so that the second clamping piece 22 clamps the steel strand 3. The steel strand 3 is clamped by the first clamping piece 21 and the second clamping piece 22, so that the recovery length of the steel strand 3 is reduced, and the error between the pre-stress size of the beam body 1 and the pre-designed pre-stress size is reduced.

After the jack is removed, the bolt 20 and the third sleeve 16 are rotated again, so that the retracted length of the steel strand 3 is known according to the rotation angle of the bolt 20 and the third sleeve 16. When the length of the retraction of the steel strand 3 is long and the prestress of the beam body 1 does not meet the design requirement, constructors need to re-stretch the steel strand 3, so that the error between the prestress of the beam body 1 and the pre-designed prestress is reduced.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A prestressed girder construction characterized in that: including the roof beam body (1), the inside pre-buried bellows (2) that are the curve setting that have of roof beam body (1), bellows (2) are inside wears to be equipped with steel strand wires (3), the both ends of bellows (2) are provided with aims board (9), aim one side that board (9) are close to bellows (2) and install in the tip of roof beam body (1), aim one side that board (9) are kept away from the roof beam body (1) and seted up operation groove (10), aim one side of hole (12) of establishing that confession steel strand wires (3) are seted up, aim the aperture of hole (12) and increase to the other end gradually by the one end that is close to roof beam body (1), steel strand wires (3) interval is encircleed there are two at least first clamping pieces (21), first clamping piece (21) are the arc and surround steel strand wires (3), steel strand wires (3) cover is equipped with connecting rope (24), first clamping piece (21) are seted up and are supplied connecting rope (24) to connect arc groove (23) that rope (24) were placed, the slope of inclining to one side of steel strand wires (3) and set up and are used for aiming operation hole (11) and operation inner wall (11) of aiming operation inner wall (11) and intercommunication of aiming board (11), operating groove (10) inside limiting plate (13) of having placed, one side fixed mounting that limiting plate (13) are close to the roof beam body (1) has first sleeve (14) that supplies steel strand wires (3) to wear to establish, limiting plate (13) are run through in first sleeve (14), the inner wall of first sleeve (14) supports pastes in steel strand wires (3), first sleeve (14) wear to locate to aim at hole (12) inside, operation mouth (11) inside is provided with clamp plate (17), the week side wall fixed connection of clamp plate (17) one side and limiting plate (13), the opposite side of clamp plate (17) stretches out from the week side of aiming at board (9) along operation mouth (11), one side that clamp plate (17) are close to the roof beam body (1) is provided with supporting shoe (18), supporting shoe (18) fixed mounting is in week side wall of aiming at board (9), screw (19) have been seted up in supporting shoe (18), screw (19) match and are provided with bolt (20), clamp plate (17) offer first through-hole (6) that supply bolt (20) to wear to establish, steel strand wires (3) surround two steel strand wires (3) at least around second steel strand wires (22) interval sleeve (22), second steel strand wires (22) are equipped with second clamping piece (22), second sleeve (15) fixed mounting keeps away from one side of the roof beam body (1) in limiting plate (13), the internal diameter of second sleeve (15) is reduced to the other end by the one end of keeping away from limiting plate (13) gradually, the lopsidedness that steel strand wires (3) were kept away from in second clamping piece (22) sets up the inner wall that is used for laminating second sleeve (15), second clamping piece (22) are located one side that the roof beam body (1) was kept away from in limiting plate (13), steel strand wires (3) cover is equipped with third sleeve (16), threaded connection between the inner wall of third sleeve (16) and the outer wall of second sleeve (15), the inner wall fixed mounting that the one end of the roof beam body (1) was kept away from in third sleeve (16) has spacing ring (25), the inner wall of spacing ring (25) supports and pastes in steel strand wires (3), one side damping grafting that the roof beam body (1) was kept away from in second clamping piece (22) is equipped with bracing piece (27), spacing ring (25) offer second through-hole (7) that supply bracing piece (27) to wear to establish, bracing piece (27) one end fixed mounting has stopper (26) that limiting plate (22).

2. The prestressed girder structure of claim 1, wherein: and anti-skid grains are arranged on one side of the first clamping piece (21) close to the steel strand (3) and one side of the second clamping piece (22) close to the steel strand (3).

3. The prestressed beam construction of claim 1, wherein: the equal fixed mounting in both ends of bellows (2) has backing plate (5), backing plate (5) are run through in steel strand wires (3), spring muscle (4) are installed to one side that backing plate (5) are close to bellows (2), bellows (2) are located to spring muscle (4) cover, aim board (9) fixed mounting in one side that bellows (2) were kept away from in backing plate (5), backing plate (5) and spring muscle (4) all are located the inside of the roof beam body (1).

4. A prestressed beam construction, according to claim 3, wherein: the outer wall of the two ends of the corrugated pipe (2) is fixedly provided with first grouting pipes (28), one end of each first grouting pipe (28) is communicated with the inside of the corrugated pipe (2), the other end of each first grouting pipe (28) is fixedly arranged on the corresponding backing plate (5), one side, far away from the corresponding first grouting pipe (28), of the backing plate (5) is provided with a second grouting pipe (29), the second grouting pipes (29) are communicated with the end, far away from the corrugated pipe (2), of the corresponding first grouting pipes (28), the second grouting pipes (29) are provided with valves (30), the outer wall of the corrugated pipe (2) is fixedly provided with a plurality of inspection pipes (8), one ends of the inspection pipes (8) are communicated with the inside of the corrugated pipe (2), and the inspection pipes (8) are arranged at intervals along the length direction of the corrugated pipe (2).

5. A construction method of a prestressed beam structure is characterized in that: comprising the use of a prestressed beam construction according to any one of claims 1-4, in the following steps: s1, binding steel bars of a beam body (1), and installing a corrugated pipe (2); s2, penetrating a steel strand (3) into the corrugated pipe (2); s3, sequentially mounting spiral ribs, a backing plate (5) and an aiming plate (9) at two ends of the steel strand (3), mounting a first grouting pipe (28) and a second grouting pipe (29) at two ends of the corrugated pipe (2), and mounting inspection pipes (8) at intervals along the length direction of the corrugated pipe (2); s4, erecting a template along the steel bars of the beam body (1) and pouring concrete of the beam body (1); s5, tensioning the steel strand (3), which comprises the following steps: s501, sequentially placing the first clamping piece (21), the limiting plate (13), the jack, the auxiliary sighting telescope and the auxiliary clamp into the steel strand (3); s502, starting a jack to stretch the steel strand (3); s503, a bolt (20) penetrates through the first through hole (6) and then is screwed into the screw hole (19), and the first sleeve (14) pushes the first clamping piece (21) to enter the sighting hole (12) to clamp the steel strand (3); s504, rotating the third sleeve (16), wherein the third sleeve (16) drives the second clamping piece (22) to enter the second sleeve (15) to clamp the steel strand (3); s505, closing the jack, and taking down and recycling the jack, the auxiliary sighting device and the auxiliary clamp; s506, screwing the bolt (20) and the third sleeve (16) again; s6, pouring concrete into the second grouting pipe (29), wherein the method comprises the following steps: s601, opening a valve (30), and pouring concrete into the second grouting pipe (29); s602, sealing the inspection pipe (8) after the concrete overflows from the inspection pipe (8); s603, pouring concrete into the second grouting pipe (29) after each inspection pipe (8) is sealed; and S7, sealing and aiming.