Cast-in-situ box girder prestress intelligent tensioning construction process

Abstract

The application relates to a cast-in-place box girder prestress intelligent tensioning construction process and belongs to the field of prestress tensioning, mainly comprising the following steps: S1, steel strands are arranged; S2, a working anchor is sleeved on the steel strands, a plurality of clamping pieces on one tensioning position are simultaneously inserted into and abut against the hole positions of the working anchor through a quick mounting mechanism, a jack is sleeved on the steel strands, a tool anchor is sleeved on the steel strands, and the plurality of clamping pieces are again simultaneously inserted into and abut against the hole positions of the tool anchor through the quick mounting mechanism; S3, the jack is controlled by a numerical control hydraulic pump station to tension the steel strands; S4, the tool anchor and the jack are disassembled; and S5, a grouting pump is used for grouting the tensioning position duct and sealing the anchors at both ends of the tensioning position duct. The quick mounting mechanism is used for realizing the quick mounting and quick abutment of the plurality of clamping pieces, and the construction efficiency of prestress tensioning of the box girder is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of prestressed tensioning, in particular to a cast-in-place box girder prestressed intelligent tensioning construction process. BACKGROUND

[0002] Prestressed tensioning is to add tension in the component in advance, so that the prestressed tensioning component subjected to compressive stress, and then produce certain deformation to cope with the load of the structure itself, including the load of the component itself weight, wind load, snow load, earthquake load, etc.

[0003] At present, steel strands are usually arranged in cast-in-place box girders, then the anchor sleeve is sleeved on the steel strands, and the clamping piece is inserted into the hole position of the anchor sleeve, so that the clamping piece clamps the steel strands, then the jack is used to tension the steel strands, and then prestressed tensioning is applied to the box girder. However, there are usually multiple tensioning positions on the box girder, and each tensioning position contains multiple steel strands. When the construction personnel tension the steel strands of each tensioning position, the clamping piece needs to be clamped into the hole position on the anchor sleeve one by one, and then the steel pipe is used to tightly clamp the clamping piece into the hole position on the anchor sleeve one by one, which is time-consuming and laborious, and greatly affects the construction efficiency. SUMMARY

[0004] In order to improve the construction efficiency of prestressed tensioning of the box girder, the present application provides a cast-in-place box girder prestressed intelligent tensioning construction process.

[0005] The cast-in-place box girder prestressed intelligent tensioning construction process provided by the present application adopts the following technical scheme:

[0006] A cast-in-place box girder prestressed intelligent tensioning construction process mainly includes the following steps:

[0007] S1: arranging steel strands;

[0008] S2: sleeving a working anchor on the steel strands, inserting and tightly clamping multiple clamping pieces on one tensioning position into the hole position of the working anchor through the quick mounting mechanism, sleeving a jack on the steel strands, sleeving a tool anchor on the steel strands, and inserting and tightly clamping multiple clamping pieces into the hole position of the tool anchor again through the quick mounting mechanism;

[0009] S3: controlling the jack to tension the steel strands through the numerical control hydraulic pump station;

[0010] S4: disassembling the tool anchor and the jack;

[0011] S5: performing grouting on the tensioning position channel through the grouting pump, and sealing the anchor at both ends of the tensioning position channel.

[0012] Through the technical scheme, the construction personnel inserts the steel strand into the box girder, then inserts a working anchor at both ends of the steel strand, then simultaneously inserts multiple clamping pieces into the hole positions of the working anchor through the quick-assembly mechanism, then inserts a jack onto the steel strand, then inserts a tool anchor onto the steel strand, then simultaneously inserts multiple clamping pieces into the hole positions of the tool anchor through the quick-assembly mechanism, then connects the numerical control hydraulic pump station to the jack, controls the jack to tension the steel strand through the numerical control hydraulic pump station, removes the tool anchor and the jack from the steel strand after the steel strand is tensioned, then performs grouting on the tensioning position channel through the grouting pump, and seals the anchors at both ends of the tensioning position channel, thereby completing the prestress tensioning of the box girder, and the quick-assembly mechanism is used to quickly assemble and tightly clamp the multiple clamping pieces, thereby effectively improving the construction efficiency of the prestress tensioning of the box girder.

[0013] Optionally, the quick-assembly mechanism comprises a support frame, a support rod, a support base, a telescopic rod, a quick-assembly disc, a first driving assembly and a second driving assembly, the support rod is slidingly arranged on the support frame along a direction parallel to the steel strand, the support base is slidingly arranged on the support rod along a direction perpendicular to the steel strand, the telescopic rod is arranged on the support base, the length of the telescopic rod is telescopic, the quick-assembly disc is arranged on the telescopic rod, and multiple clamping slots for clamping the clamping pieces are formed in the quick-assembly disc; the first driving assembly is arranged on the support frame and is used to drive the support rod to slide on the support frame; and the second driving assembly is arranged on the support base and is used to drive the support base to slide on the support rod.

[0014] Through the technical scheme, the construction personnel drives the support rod to slide on the support frame along a direction parallel to the steel strand through the first driving assembly, drives the support base to slide on the support rod along a direction parallel to the steel strand through the second driving assembly, adjusts the length of the telescopic rod, and then adjusts the quick-assembly disc to be opposite to the tensioning position channel to be tensioned, then the construction personnel clamps the assembled clamping pieces into the clamping slots, then drives the support rod to slide on the support frame through the first driving assembly, so that the quick-assembly disc moves towards the box girder, multiple steel strands at the tensioning position channel are inserted into one clamping piece during the movement, and then the quick-assembly disc is continuously driven to move towards the working anchor or the tool anchor, so that multiple clamping pieces are simultaneously inserted into and tightly clamped into the hole positions of the working anchor or the tool anchor, and the quick-assembly disc can abut against the tool anchor, preventing the clamping pieces from being separated from the tool anchor during subsequent tensioning of the steel strand, and improving the stability of the clamping pieces when clamping the steel strand.

[0015] Optionally, the first driving assembly comprises a first motor and a lead screw, the first motor is arranged on the support frame, the lead screw is coaxially arranged on the output shaft of the first motor, and the lead screw is threadedly arranged on the support rod.

[0016] By adopting the technical scheme, the construction personnel starts the first motor, the output shaft of the first motor drives the screw rod to rotate, the screw rod drives the support rod to slide on the support frame along the direction parallel to the steel strand, and then the fast mounting disc is close to or away from the box girder, and the installation of the clamping piece is realized.

[0017] Optionally, the second driving assembly comprises a second motor, a gear and a rack, the second motor is arranged on the support base, the gear is coaxially arranged on the output shaft of the second motor, and the rack is arranged on the support rod along the length direction of the support rod.

[0018] By adopting the technical scheme, the construction personnel starts the second motor, the output shaft of the second motor drives the gear to rotate, the support base is driven to move on the support rod along the length direction of the rack, the fast mounting disc is driven to move along the direction perpendicular to the steel strand, and the fast mounting disc can correspond to the tension hole of the box girder at different positions, and the applicability of the fast mounting disc to different tension holes is improved.

[0019] Optionally, the telescopic rod comprises a large rod, a small rod, a screw rod, a worm gear and a worm, the large rod is arranged on the support base, the large rod is hollow and open at one end away from the support base, the small rod is slidingly arranged in the large rod, and the fast mounting disc is arranged on the small rod; the screw rod is rotationally arranged on the inner bottom wall of the large rod, the screw rod is threaded into the small rod, the worm gear is coaxially arranged on the screw rod, the worm is rotationally arranged in the large rod, and the worm is engaged with the worm gear.

[0020] By adopting the technical scheme, the construction personnel rotates the worm, the worm drives the worm gear to rotate, and the worm gear drives the screw rod to rotate, so that the small rod slides in the large rod towards the large rod or away from the large rod, the fast mounting disc moves towards the large rod or away from the large rod, the fast mounting disc is aligned with the tension hole of the box girder at different heights, and the applicability of the fast mounting disc to different tension holes is further improved.

[0021] Optionally, the tool anchor is provided with a clamping block, the jack is provided with a ring piece, the ring piece and the jack form a space for the clamping block to be clamped into, and the ring piece is provided with a notch for the clamping block to be clamped into.

[0022] By adopting the technical scheme, when the tool anchor is installed, the construction personnel pushes the tool anchor to make the clamping block clamped into the space formed by the ring piece and the jack, then rotates the jack to turn the notch away from the clamping block, the connection between the tool anchor and the jack is completed, the jack is retracted after tensioning the steel strand, and the jack can drive the tool anchor to move together, at this time, the clamping piece can be separated from the hole position on the tool anchor due to the friction between the clamping piece and the steel strand, the clamping plate and the tool anchor are automatically separated, the clamping piece is prevented from being clamped on the tool anchor, and the convenience of the construction personnel to separate the clamping piece from the tool anchor is improved.

[0023] Optionally, a backing plate is sleeved on the working anchor, and the jack is sleeved on the backing plate.

[0024] By adopting the above technical scheme, the construction personnel sleeves the backing plate on the working anchor, and then sleeves the jack on the backing plate. The backing plate provides support for the jack, thereby improving the stability of the jack on the steel strand.

[0025] Optionally, a hand-operated hoist is arranged on the support frame, and the hand-operated hoist is hooked on the jack.

[0026] By adopting the above technical scheme, the construction personnel controls the hand-operated hoist to tighten or loosen, so as to adjust the jack to the tensioning position hole of different box girders, thereby facilitating the hoisting and shifting of the jack by the construction personnel.

[0027] Optionally, S5 further includes: air in the tensioning position hole is extracted by a negative pressure mechanism.

[0028] By adopting the above technical scheme, the air in the tensioning position hole is extracted by the negative pressure mechanism first, and then the tensioning position hole is grouted by the grouting pump, thereby improving the grouting effect of the tensioning position hole.

[0029] Optionally, the negative pressure mechanism includes a negative pressure container, a vacuum pump and a vacuum gauge. The negative pressure container is communicatively arranged on the tensioning position hole. The vacuum pump is communicatively arranged on the negative pressure container. The vacuum gauge is arranged on the communication pipe between the vacuum pump and the negative pressure container.

[0030] By adopting the above technical scheme, before grouting, the construction personnel starts the vacuum pump, the vacuum pump extracts the air in the tensioning position hole, so that negative pressure is formed in the tensioning position hole. After the vacuum gauge detects that the vacuum degree between the vacuum pump and the negative pressure container reaches the set requirement, grouting is performed. The negative pressure container provides transition, preventing sundries or liquid in the tensioning position hole from being directly sucked into the vacuum pump, thereby affecting the service life of the vacuum pump.

[0031] In summary, the present application has the following at least one beneficial technical effect:

[0032] 1. The fast mounting mechanism realizes fast mounting and fast abutting of the plurality of clamping pieces, thereby effectively improving the construction efficiency of prestressed tensioning of the box girder.

[0033] 2. The fast mounting disc can abut on the tool anchor, preventing the clamping piece from being separated from the tool anchor during subsequent tensioning of the steel strand, thereby improving the stability of the clamping piece when clamping the steel strand.

[0034] 3. After the completion of the jack tensioning steel strand, the jack is recovered, and the jack can drive the tool anchor to move together, and at this time the clamping piece can be separated from the hole position on the tool anchor due to the friction between the clamping piece and the steel strand, and the convenience of the construction personnel driving the clamping piece to separate from the tool anchor. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural schematic diagram of a cast-in-place box girder prestressed intelligent tensioning construction process of an embodiment of the present application.

[0036] Figure 2 is an exploded schematic diagram of a working anchor, a clamping piece, a backing plate, a jack, a tool anchor and a quick mounting disc of an embodiment of the present application.

[0037] Figure 3 is a structural schematic diagram of the grouting of a tensioning hole channel of an embodiment of the present application.

[0038] Figure 4 is a partial sectional view of an extension rod of an embodiment of the present application.

[0039] Figure 5 is a structural schematic diagram of a clamping piece and a quick mounting disc of an embodiment of the present application.

[0040] Figure 6 is Figure 1 a partial enlarged schematic diagram of part A.

[0041] Reference signs: 1, steel strand; 2, working anchor; 3, clamping piece; 4, jack; 5, tool anchor; 6, quick mounting mechanism; 61, support frame; 62, support rod; 63, support seat; 64, extension rod; 641, large rod; 642, small rod; 643, screw rod; 644, worm wheel; 645, worm; 65, quick mounting disc; 66, first driving assembly; 661, first motor; 662, lead screw; 67, second driving assembly; 671, second motor; 672, gear; 673, rack; 7, grouting pump; 8, clamping block; 9, ring piece; 91, notch; 10, backing plate; 11, hand-operated hoist; 12, negative pressure mechanism; 121, negative pressure container; 122, vacuum pump; 123, vacuum gauge. DETAILED DESCRIPTION

[0042] The following will be described in detail in combination with the accompanying Figures 1-6 The present application is further described in detail.

[0043] An embodiment of the present application discloses a cast-in-place box girder prestressed intelligent tensioning construction process.

[0044] Reference Figure 1 , Figure 2 , the cast-in-place box girder prestressed intelligent tensioning construction process mainly includes the following steps:

[0045] S1: the steel strand 1 is arranged;

[0046] S2: the working anchor 2 is sleeved on the steel strand 1, the plurality of clamping pieces 3 in one tensioning position are simultaneously inserted into and abut against the hole position of the working anchor 2 through the quick-assembly mechanism 6, the backing plate 10 is sleeved on the working anchor 2, the jack 4 is sleeved on the backing plate 10 through the steel strand 1, and the tool anchor 5 is sleeved on the steel strand 1, and the plurality of clamping pieces 3 are again simultaneously inserted into and abut against the hole position of the tool anchor 5 through the quick-assembly mechanism 6;

[0047] S3: the steel strand 1 is tensioned through the numerical control hydraulic pump station control jack 4;

[0048] S4: the tool anchor 5 and the jack 4 are disassembled;

[0049] S5: combined Figure 3 , the air in the tensioning position channel is extracted through the negative pressure mechanism 12, the tensioning position channel is grouted through the grouting pump 7, and the tensioning position channel is anchored at both ends.

[0050] Referring to Figure 1 , S1 includes: arranging the steel strand 1, in the embodiment, a plurality of corrugated pipes are arranged inside the box girder before pouring, the plurality of corrugated pipes form the tensioning position channel of the box girder, the corrugated pipes are welded on the box girder reinforcement, and both ends of the corrugated pipes are provided with spiral reinforcement and positioning plates, so that the end portions of the corrugated pipes are more stable in the box girder after the pouring of the box girder is completed; after the structural strength of the box girder after pouring reaches a set value, the construction personnel again arrange the steel strand 1 in the corrugated pipe through a threading machine, and the end portion of the steel strand 1 is wrapped with a rubber sleeve head during threading to prevent the corrugated pipe from being punctured.

[0051] Referring to Figure 1 , Figure 2 , S2 includes: sleeving one working anchor 2 on both ends of the steel strand 1 and clamping the working anchor 2 to the positioning plate; the plurality of clamping pieces 3 in one tensioning position are simultaneously inserted into and abut against the hole position of the working anchor 2 through the quick-assembly mechanism 6, in the embodiment, the clamping piece 3 includes two conical pieces, the two conical pieces are fitted to form a conical shape, the end of the two conical pieces with a larger diameter is clamped through a rubber ring, and when the two conical pieces are assembled, plastic adhesive tape is adhered to the end surfaces of the two conical pieces, so as to facilitate subsequent disassembly of the two conical pieces; the backing plate 10 is sleeved on the working anchor 2 and clamped to the working anchor 2, in the embodiment, the end of the backing plate 10 close to the working anchor 2 is arranged in a concave manner, so that the backing plate 10 can be sleeved on the working anchor 2, the stability of the backing plate 10 is increased, then the jack 4 is sleeved on the backing plate 10 through the steel strand 1, the backing plate 10 provides support for the jack 4, and the stability of the jack 4 when sleeved on the steel strand 1 is increased; the tool anchor 5 is sleeved on the steel strand 1, and the plurality of clamping pieces 3 are again simultaneously inserted into and abut against the hole position of the tool anchor 5 through the quick-assembly mechanism 6.

[0052] Referring to Figure 1 , Figure 4 , the fast-assembly mechanism 6 comprises a support frame 61, a support rod 62, a support base 63, a telescopic rod 64, a fast-assembly disc 65, a first driving assembly 66 and a second driving assembly 67. The support rod 62 is slidingly installed on the support frame 61 along a direction parallel to the steel strand 1, and the support rod 62 is perpendicular to the steel strand 1. In this embodiment, the top of the support frame 61 is provided with a guide rail, and both ends of the support rod 62 are slidingly arranged on the guide rail, thereby improving the stability of the support rod 62 during sliding;

[0053] The telescopic rod 64 is installed on the support base 63, and the length of the telescopic rod 64 is telescopic. The telescopic rod 64 comprises a large rod 641, a small rod 642, a screw rod 643, a worm wheel 644 and a worm 645. The large rod 641 is installed on the support base 63, and the large rod 641 is hollow inside and open at an end away from the support base 63. The small rod 642 is slidingly installed in the large rod 641. The screw rod 643 is rotationally installed on the inner bottom wall of the large rod 641, and the end of the screw rod 643 away from the large rod 641 is threadedly arranged in the small rod 642. In this embodiment, the shape of the opening in the large rod 641 is rectangular, and the cross-sectional shape of the small rod 642 is also rectangular, so as to prevent the small rod 642 from rotating synchronously with the screw rod 643. In other embodiments, the shape of the opening in the large rod 641 can also be triangular, pentagonal or the like, as long as the small rod 642 can be prevented from rotating in the large rod 641. The worm wheel 644 is coaxially installed on the screw rod 643, and the worm 645 is rotationally installed on the large rod 641 and extends into the large rod 641 to engage with the worm wheel 644. In this embodiment, the construction personnel drives the worm 645 to rotate by using a wrench or the like. In other embodiments, the construction personnel can also drive the worm 645 to rotate by using a servo motor. The fast-assembly disc 65 is installed on the small rod 642, and a plurality of clamping grooves for clamping the clamping piece 3 are formed in the fast-assembly disc 65. In this embodiment, a plurality of through holes for the steel strand 1 to pass through are formed in the fast-assembly disc 65, and the plurality of through holes and the holes on the working anchor 2 and the tool anchor 5 are one-to-one corresponding. The clamping grooves are formed at the through holes, and the diameter of the clamping grooves is the same as the larger end of the clamping piece 3. Figure 5 In this embodiment, a plurality of through holes for the steel strand 1 to pass through are formed in the fast-assembly disc 65, and the plurality of through holes and the holes on the working anchor 2 and the tool anchor 5 are one-to-one corresponding. The clamping grooves are formed at the through holes, and the diameter of the clamping grooves is the same as the larger end of the clamping piece 3.

[0054] Referring to Figure 1 , Figure 6The first driving assembly 66 is installed on the support frame 61, and the first driving assembly 66 is used to drive the support rod 62 to slide on the support frame 61. The first driving assembly 66 comprises a first motor 661 and a lead screw 662. The first motor 661 is installed on the support frame 61. In this embodiment, the first motor 661 is a servo motor. The lead screw 662 is coaxially installed on the output shaft of the first motor 661. The length direction of the lead screw 662 is parallel to the steel strand 1, and the lead screw 662 is threaded through the support rod 62.

[0055] The second driving assembly 67 comprises a second motor 671, a gear 672 and a rack 673. The second motor 671 is installed on the support seat 63. In this embodiment, the second motor 671 is a servo motor. The gear 672 is coaxially installed on the output shaft of the second motor 671. The rack 673 is installed on the support rod 62 along the length direction of the support rod 62. The gear 672 is engaged with the rack 673.

[0056] After the construction workers attach the working anchor 2 to the steel strand 1, they start the second motor 671. The output shaft of the second motor 671 drives the gear 672 to rotate, which in turn drives the rack 673 to rotate. This causes the support seat 63 to move on the support rod 62 in a direction perpendicular to the steel strand 1. The telescopic rod 64 then drives the quick-release plate 65 to move to the same vertical plane as the tensioning position channel to be tensioned. Then, the construction workers rotate the worm gear 645, which drives the worm wheel 644 to rotate. The worm wheel 644 drives the screw 643 to rotate, which in turn drives the small rod 642 to move closer to or further away from the large rod 641. The small rod 642 moves in a certain direction, which in turn moves the quick-release plate 65 to be aligned with the tensioning position channel to be tensioned. Then, the construction workers assemble multiple clamping plates 3 and insert them into the quick-release plate 65. Then, the first motor 661 is started. The output shaft of the first motor 661 drives the lead screw 662 to rotate, causing the support rod 62 to slide on the support frame 61 in a direction parallel to the steel strand 1. The support rod 62 drives the telescopic rod 64 to move, which in turn causes the quick-release plate 65 to move the clamping plates 3 towards the working anchor 2. The construction workers ensure that each steel strand 1 passes through a clamping plate 3, and then continue to drive the quick-release plate 65 towards the working anchor 2. Moving the quick-release disc 65 in one direction causes multiple clamping plates 3 on the quick-release disc 65 to simultaneously engage with multiple holes on the working anchor 2, securing the clamping plates 3 against the holes on the working anchor 2. Then, the construction worker drives the first motor 661 in reverse, causing the quick-release disc 65 to retract from the steel strand 1. The pad 10 is then placed onto the steel strand 1 and onto the working anchor 2. The jack 4 is then hoisted onto the pad 10. The tool anchor 5 is then placed onto the steel strand 1. The clamping plates 3 are once again engaged with the quick-release disc 65. Moving the quick-release disc 65 towards the tool anchor 5 again allows multiple clamping plates 3 to be simultaneously inserted and secured against the working anchor. Within the holes of tool anchor 5 or 2, and during the subsequent tensioning process, the construction personnel drive the quick-release plate 65 to move synchronously with tool anchor 5 away from the box girder. The quick-release plate 65 can also continuously press against tool anchor 5 to prevent clamping plate 3 from detaching from tool anchor 5 when tensioning steel strand 1, thereby improving the stability of clamping steel strand 1 by clamping plate 3. Furthermore, the construction personnel drive support rod 62 to move support seat 63 through second motor 671. By adjusting the length of telescopic rod 64, the quick-release plate 65 can be aligned with different tensioning holes on the box girder, thereby improving the applicability of quick-release plate 65 to different tensioning holes.

[0057] Reference Figure 1 , Figure 2 The tool anchor 5 is equipped with a locking block 8. The jack 4 has a ring plate 9 installed circumferentially on the side wall where the tool anchor 5 is locked. The ring plate 9 and the jack 4 form a space for the locking block 8 to be locked, and the ring plate 9 has a notch 91 reserved for the locking block 8 to be locked.

[0058] When the tool anchor 5 is installed, the construction personnel pushes the tool anchor 5 so that the clamping block 8 is clamped into the space formed by the ring piece 9 and the jack 4, and then rotates the jack 4, so that the gap 91 is turned away from the clamping block 8, and the jack 4 tensioning the steel strand 1 is completed. After the jack 4 is recovered, the jack 4 can drive the tool anchor 5 to move together. At this time, the clamping piece 3 can be separated from the hole position on the tool anchor 5 due to the friction between the clamping piece 3 and the steel strand 1, so as to realize the automatic separation of the clamping piece 3 and the tool anchor 5, prevent the clamping piece 3 from being clamped on the tool anchor 5, and improve the convenience of the construction personnel to drive the clamping piece 3 and the tool anchor 5 to separate.

[0059] With reference to Figure 1 , the support frame 61 is provided with a chain hoist 11, and the movable end of the chain hoist 11 is hooked on the jack 4. In this embodiment, two chain hoists 11 are installed on the support frame 61, and the two chain hoists 11 are respectively hooked on the two ends of the jack 4, so as to improve the stability of lifting the jack 4. The construction personnel can hoist the jack 4 to different tensioning hole channels on the box girder by loosening or tightening the two chain hoists 11, so as to improve the convenience of the construction personnel to move the jack 4, and the chain hoist 11 can also hoist and support the jack 4, so as to improve the stability of the jack 4 during work.

[0060] With reference to Figure 1 , S3 comprises tensioning the steel strand 1 by the numerical control hydraulic pump station controlling the jack 4. In this embodiment, the jack 4 is a through-type jack, and the numerical control hydraulic pump station is an LZ-type intelligent prestressed tensioning system, which comprises a main numerical control hydraulic pump station, a vice numerical control hydraulic pump station, a high-pressure oil pipe, a high-precision hydraulic sensor, a displacement sensor, a data monitoring computer, an operating system software and the like. Before tensioning, the tensioning parameters of each tensioning hole channel of the whole box girder are pre-set according to the tensioning sequence. During tensioning, the sequence number is adjusted, and the tensioning is directly completed by pressing the start key.

[0061] With reference to Figure 1 , Figure 2 , S4 comprises disassembling the tool anchor 5, the jack 4 and the pad plate 10. After tensioning is completed, the construction personnel disassembles the tool anchor 5, the jack 4 and the pad plate 10 from the steel strand 1 in sequence, and cuts a section of the steel strand 1 extending from the working anchor 2. At this time, the steel strand 1 always has a tendency to drive the clamping piece 3 to move towards the working anchor 2, so that the clamping piece 3 is always tightly clamped in the hole position on the working anchor 2, and the clamping piece 3 clamps the steel strand 1.

[0062] With reference to Figure 1 , Figure 3S5 includes: through the negative pressure mechanism 12 to extract the air in the tension hole, the negative pressure mechanism 12 includes negative pressure container 121, vacuum pump 122 and vacuum table 123, negative pressure container 121 is communicated in the tension hole, vacuum pump 122 is communicated and installed on negative pressure container 121, vacuum table 123 is installed on the communication pipe of vacuum pump 122 and negative pressure container 121, in the embodiment, the communication of negative pressure container 121 and tension hole is installed with valve; through the pressure grouting pump 7 to the tension hole is grouted, and the both ends of tension hole are sealed anchor, in the embodiment, the communication pipe of pressure grouting pump 7 and tension hole is installed with pressure gauge, to facilitate the construction personnel to detect the pressure when grouting, and the communication of pressure grouting pump 7 and tension hole is installed with valve and protective cover, the valve is closed to extract the air in the hole when the end of hole is closed, the protective cover prevents cement slurry splashing.

[0063] The construction personnel first close the valve at the tension hole of one end of pressure grouting pump 7, then start vacuum pump 122, vacuum pump 122 extracts the air and sundries in the tension hole into negative pressure container 121, so that negative pressure is formed in the tension hole, after the vacuum degree between vacuum pump 122 and negative pressure container 121 is detected by vacuum table 123 to reach the set requirement, the construction personnel close the valve at the tension hole of one end of vacuum pump 122, then start pressure grouting pump 7 to press the cement slurry into the tension hole; after grouting, the end of tension hole is cleaned, then the reinforcement mesh is installed, and the end sealing concrete is poured.

[0064] The implementation principle of the cast-in-place box girder prestress intelligent tensioning construction process in the embodiment of the application is as follows: a construction worker passes the steel strand 1 through the threading machine to the corrugated pipe embedded in the box girder, then a working anchor 2 is sleeved on both ends of the steel strand 1, then the second motor 671 is started to drive the support seat 63 to move, the telescopic rod 64 drives the quick mounting disc 65 to move to the tensioning position hole to be tensioned, the length of the telescopic rod 64 is adjusted to align the quick mounting disc 65 with the tensioning position hole to be tensioned, then the assembled multiple clamping pieces 3 are clamped into the clamping grooves formed in the quick mounting disc 65, the first motor 661 is started to drive the quick mounting disc 65 to move towards the working anchor 2, in the process, the construction worker passes each steel strand 1 into a clamping piece 3 respectively, then the first motor 661 continues to drive the quick mounting disc 65 to move towards the working anchor 2, that is, the multiple clamping pieces 3 are simultaneously inserted into and abut against the hole positions of the working anchor 2, then the first motor 661 drives the quick mounting disc 65 to exit the steel strand 1, then the worker sleeves the pad 10 on the steel strand 1 and the working anchor 2, then the hand-operated hoist 11 is used to hoist and sleeve the jack 4 on the pad 10, then the tool anchor 5 is sleeved on the steel strand 1 and clamped into the jack 4, at this time, the clamping block 8 on the tool anchor 5 is clamped into the space formed by the ring piece 9 and the jack 4 from the gap 91, then the jack 4 is rotated, so that the gap 91 is turned away from the clamping block 8, then the multiple clamping pieces 3 are clamped into the multiple clamping grooves in the quick mounting disc 65 again, the first motor 661 drives the quick mounting disc 65 to move towards the tool anchor 5, so that the multiple clamping pieces 3 are simultaneously inserted into and abut against the hole positions of the tool anchor 5, then the numerical control hydraulic pump station is connected to the jack 4, the numerical control hydraulic pump station is used to control the jack 4 to tension the steel strand 1, in the tensioning process, the first motor 661 drives the quick mounting disc 65 to move away from the box girder, so that the quick mounting disc 65 moves synchronously with the tool anchor 5, after the steel strand 1 is tensioned to the position, the jack 4 is relieved of pressure, so that the tool anchor 5 moves synchronously, at this time, the clamping piece 3 is separated from the hole position of the tool anchor 5 due to the friction between the clamping piece 3 and the steel strand 1, so that the clamping piece and the tool anchor 5 are automatically separated, then the construction worker drives the quick mounting disc 65 to exit the steel strand 1, and the tool anchor 5, the jack 4 and the pad 10 are disassembled, the vacuum pump 122 is used to extract the air in the tensioning position hole, the pressure grouting pump 7 is used to pressure grout the tensioning position hole, and the tensioning position hole is sealed at both ends, the box girder prestress tensioning is completed, the quick mounting mechanism 6 is used to quickly mount and abut the multiple clamping pieces 3, which effectively improves the construction efficiency of the box girder prestress tensioning, the quick mounting disc 65 abuts on the clamping piece 3 in the tensioning process, which prevents the clamping piece 3 from being separated from the tool anchor 5, improves the safety of the tensioning process, and the clamping piece 3 is automatically separated from the tool anchor 5 when the jack 4 is relieved of pressure, which improves the convenience of the construction worker in disassembling the clamping piece 3 from the tool anchor 5.

[0065] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A cast-in-place box girder prestress intelligent tensioning construction process, characterized in that: The method mainly comprises the following steps: S1: threading the steel strand (1); S2: sleeving the working anchor (2) on the steel strand (1), inserting and tightly fitting the multiple clamping pieces (3) on one tensioning position into the hole position of the working anchor (2) through the quick-assembly mechanism (6), sleeving the jack (4) on the steel strand (1), sleeving the tool anchor (5) on the steel strand (1), and again inserting and tightly fitting the multiple clamping pieces (3) into the hole position of the tool anchor (5) through the quick-assembly mechanism (6); the quick-assembly mechanism (6) comprises a support frame (61), a support rod (62), a support base (63), an extension rod (64), a quick-assembly disc (65), a first driving assembly (66) and a second driving assembly (67); the support rod (62) is slidingly arranged on the support frame (61) along a direction parallel to the steel strand (1); the support base (63) is slidingly arranged on the support rod (62) along a direction perpendicular to the steel strand (1); the extension rod (64) is arranged on the support base (63); the length of the extension rod (64) is telescopic; the quick-assembly disc (65) is arranged on the extension rod (64); a plurality of clamping grooves for clamping the clamping pieces (3) are formed in the quick-assembly disc (65); the first driving assembly (66) is arranged on the support frame (61) and used for driving the support rod (62) to slide on the support frame (61); the second driving assembly (67) is arranged on the support base (63) and used for driving the support base (63) to slide on the support rod (62); the first driving assembly (66) comprises a first motor (661) and a lead screw (662); the first motor (661) is arranged on the support frame (61); the lead screw (662) is coaxially arranged on the output shaft of the first motor (661); and the lead screw (662) is threadedly arranged on the support rod (62); the second driving assembly (67) comprises a second motor (671), a gear (672) and a rack (673); the second motor (671) is arranged on the support base (63); the gear (672) is coaxially arranged on the output shaft of the second motor (671); the rack (673) is arranged on the support rod (62) along the length direction of the support rod (62); and the rack (673) is engaged with the gear (672); the extension rod (64) comprises a large rod (641), a small rod (642), a screw rod (643), a worm wheel (644) and a worm (645); the large rod (641) is arranged on the support base (63); the large rod (641) is hollow and has an opening at one end away from the support base (63); the small rod (642) is slidingly arranged in the large rod (641); and the quick-assembly disc (65) is arranged on the small rod (642); the screw rod (643) is rotationally arranged on the inner bottom wall of the large rod (641); the screw rod (643) is threadedly arranged in the small rod (642); the worm wheel (644) is coaxially arranged on the screw rod (643); the worm (645) is rotationally arranged in the large rod (641); and the worm (645) is engaged with the worm wheel (644). S3: control the jack (4) to stretch the steel strand (1) through the numerical control hydraulic pump station; S4: disassemble the tool anchor (5) and the jack (4); S5: carry out the grouting to the hole of the stretching position through the grouting pump (7), and seal the anchor at both ends of the hole of the stretching position.

2. The cast-in-place box girder prestress intelligent tensioning construction process according to claim 1, characterized in that: The tool anchor (5) is provided with a clamping block (8), the jack (4) is provided with a ring piece (9), the ring piece (9) and the jack (4) constitute a space for the clamping block (8) to be clamped into, and the ring piece (9) is reserved with a notch (91) for the clamping block (8) to be clamped into.

3. The cast-in-place box girder prestress intelligent tensioning construction process according to claim 1, characterized in that: The working anchor (2) is sleeved with a backing plate (10), and the jack (4) is sleeved on the backing plate (10).

4. The cast-in-place box girder prestress intelligent tensioning construction process according to claim 1, characterized in that: The supporting seat (63) is provided with a hand-operated hoist (11), and the hand-operated hoist (11) is hooked on the jack (4).

5. The cast-in-place box girder prestress intelligent tensioning construction process according to claim 1, characterized in that: S5 further comprises: air in the hole of the stretching position is extracted through a negative pressure mechanism (12).

6. The cast-in-place box girder prestress intelligent tensioning construction process according to claim 5, characterized in that: The negative pressure mechanism (12) comprises a negative pressure container (121), a vacuum pump (122) and a vacuum gauge (123), the negative pressure container (121) is communicated and arranged on the hole of the stretching position, the vacuum pump (122) is communicated and arranged on the negative pressure container (121), and the vacuum gauge (123) is arranged on the communication pipe between the vacuum pump (122) and the negative pressure container (121).

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