CN114382230A

CN114382230A - Prestressed beam structure and construction method thereof

Info

Publication number: CN114382230A
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: 2022-04-22
Anticipated expiration: 2042-01-25
Also published as: CN114382230B

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 technology 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:

a prestressed beam structure comprises a beam body, corrugated pipes arranged in a curve are pre-buried in the beam body, steel strands penetrate through the corrugated pipes, 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 operation groove, aiming holes for the steel strands to penetrate through are formed in the bottom of each operation 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 around the steel strands at intervals, the first clamping pieces surround the steel strands in an arc shape, 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, of the first clamping pieces is obliquely provided with an inner wall for laminating and aiming holes, operation ports communicated with the inner parts of the operation grooves are formed in the peripheral sides of the aiming plates, the operation opening penetrates through one side, far away from the beam body, of the aiming plate.

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. 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 pre-designed 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 when the steel strand is stretched, the clamping pieces are pulled out from the inside of the sighting holes, and the clamping pieces fall off from the steel strand. 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 is placed inside the operation groove, a first sleeve for the steel strand to penetrate is fixedly mounted on one side, close to the beam body, of the limiting plate, the first sleeve penetrates through the limiting plate, the inner wall of the first sleeve abuts against the steel strand, and the first sleeve penetrates through the aiming 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 opening, 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 opening.

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 of the pressing plate close to the beam body, the supporting block is fixedly installed on the peripheral side wall of the sighting 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 jack stretches the steel strand, 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 the fixed second clamping piece temporarily to when reducing the tensile steel strand wires, the condition that the second clamping piece dropped from the steel strand wires 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 one side that the bellows was kept away from to the backing plate, backing plate and spring muscle all are located the inside of the 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 bellows 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 backing 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 beam body steel bars and pouring concrete of the beam body; s5, tensioning the steel strand, comprising 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, wherein 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 bolt is screwed, so that the limiting plate is driven to push the first clamping pieces to enter the aiming hole, a constructor can conveniently push each first clamping piece into the aiming hole at one time, the bolt is screwed again after the jack is closed, the retraction length of the steel strand is known through the number of turns of the bolt, and the constructor can timely re-stretch the steel strand when the retraction length of the steel strand is too long and the prestress of the beam body does not meet the design requirement;

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 according to 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 structural diagram 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 the construction 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 reference numerals: 1. a beam body; 2. a bellows; 3. steel strand wires; 4. a spring rib; 5. a base 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 piece; 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. Both ends of bellows 2 all are equipped with spring muscle 4, and bellows 2's both ends are fixed mounting still has 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 runs through the backing plate 5, and the aiming plate 9 is fixedly installed 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 slot 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 then is communicated with the inside 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 inside of the arc groove 23 to connect the first clamping pieces 21 on the same steel strand 3 to each other, thereby reducing the occurrence of the first clamping pieces 21 falling 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 pressure plate 17 is driven to move towards the beam body 1, and the pressure plate 17 drives the limit 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 pre-designed 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 on 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 bar 27 has elasticity, and a limit block 26 is fixedly installed at one end of the support bar 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 bar 27 is used to temporarily fix the second jaw 22 so that the support bar 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 extent. 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, first grouting pipes 28 are fixedly installed on the outer walls of the two ends of the corrugated pipe 2, 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 installed 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. A second grout pipe 29 communicates with the end of the first grout pipe 28 remote from the corrugated pipe 2, the second grout pipe 29 being 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:

and S1, binding the steel bars of the beam body 1, and installing the 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.

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, comprising 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 to enter 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 and recovering the jack, the auxiliary sighting device and the auxiliary clamp.

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, including 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 run 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 steel strand 3 is clamped by the first clamping piece 21. 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 embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, 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) inside wears to be equipped with steel strand wires (3), the both ends of bellows (2) are provided with aims board (9), aim board (9) and install in the tip of roof beam body (1) near one side of bellows (2), aim board (9) and keep away from one side of roof beam body (1) and seted up operation groove (10), aim hole (12) that supply steel strand wires (3) to wear to establish are seted up to the tank bottom of operation groove (10), aim the aperture of hole (12) and increase gradually to the other end 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 connection rope (24), arc groove (23) that supply connection rope (24) to place are seted up to first clamping piece (21), one side slope that steel strand wires (3) were kept away from in first clamping piece (21) sets up the inner wall that is used for laminating to aim at hole (12), aim all sides of board (9) and offer operation mouth (11) with the inside intercommunication of operation groove (10), operation mouth (11) run through aim board (9) and keep away from one side of roof beam body (1).

2. The prestressed girder structure of claim 1, wherein: limiting plate (13) have been placed to operation groove (10) inside, one side fixed mounting that limiting plate (13) are close to the roof beam body (1) has first sleeve (14) that supply 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) is supported and is pasted in steel strand wires (3), first sleeve (14) are worn to locate inside aiming hole (12).

3. The prestressed girder structure of claim 2, wherein: the inside clamp plate (17) that is provided with of operation mouth (11), the week side wall fixed connection of clamp plate (17) one side and limiting plate (13), the other side of clamp plate (17) stretches out along operation mouth (11) from the week side of aiming at board (9).

4. A prestressed girder construction according to claim 3, wherein: 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), the supporting block (18) is provided with a screw hole (19), the screw hole (19) is provided with a bolt (20) in a matching mode, and the pressing plate (17) is provided with a first through hole (6) for the bolt (20) to penetrate through.

5. The prestressed girder structure of claim 2, wherein: steel strand wires (3) interval is around having two at least second clamping pieces (22), second clamping piece (22) are the arc and surround steel strand wires (3), steel strand wires (3) cover is equipped with second sleeve (15), one side of the roof beam body (1) is kept away from in limiting plate (13) second sleeve (15) fixed mounting, the internal diameter of second sleeve (15) reduces to the other end by the one end of keeping away from limiting plate (13) gradually, the one side slope 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), one side that the roof beam body (1) was kept away from in limiting plate (13) is located second clamping piece (22).

6. The prestressed girder construction of claim 5, wherein: the utility model discloses a steel strand wires (3) are 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 who keeps away from the one end of the roof beam body (1) 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 that the roof beam body (1) was kept away from in second clamping piece (22) is pegged graft and is equipped with bracing piece (27), second through-hole (7) that supply bracing piece (27) to wear to establish are seted up to spacing ring (25), the one end fixed mounting that second clamping piece (22) were kept away from in bracing piece (27) has stopper (26).

7. The prestressed girder construction of claim 5, 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).

8. The prestressed girder structure 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).

9. The prestressed girder structure of claim 8, wherein: the outer wall at both ends of bellows (2) all fixed mounting have first slip casting pipe (28), first slip casting pipe (28) one end and the inside intercommunication of bellows (2), first slip casting pipe (28) other end fixed mounting is in backing plate (5), one side that first slip casting pipe (28) were kept away from to backing plate (5) is provided with second slip casting pipe (29), the one end intercommunication of bellows (2) is kept away from with first slip casting pipe (28) in second slip casting pipe (29), second slip casting pipe (29) are provided with valve (30), the outer wall fixed mounting of bellows (2) has a plurality of inspection tubes (8), the one end of inspection tube (8) and the inside intercommunication of bellows (2), inspection tube (8) set up along the length direction interval of bellows (2).

10. A construction method of a prestressed beam structure is characterized by comprising the following steps: comprising the use of a prestressed beam structure according to claims 1-9, in the following steps: s1, binding steel bars of the beam body (1), and installing the corrugated pipe (2); s2, inserting steel strands (3) into the corrugated pipe (2); s3, sequentially mounting spiral ribs, a backing plate (5) and an aiming plate (9) at two ends of a steel strand (3), mounting a first grouting pipe (28) and a second grouting pipe (29) at two ends of a 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), comprising 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 a steel strand (3); 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) 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), and 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.