CN217438724U - Box girder vertical finish rolling screw-thread steel prestressing force stretch-draw base - Google Patents
Box girder vertical finish rolling screw-thread steel prestressing force stretch-draw base Download PDFInfo
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- CN217438724U CN217438724U CN202220514028.7U CN202220514028U CN217438724U CN 217438724 U CN217438724 U CN 217438724U CN 202220514028 U CN202220514028 U CN 202220514028U CN 217438724 U CN217438724 U CN 217438724U
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Abstract
The utility model belongs to the technical field of box girder vertical prestress tensioning construction, in particular to a box girder vertical finish rolling deformed steel prestress tensioning base; the steel plate welding counter-force seat comprises a steel plate welding counter-force seat and a piercing jack, wherein the counter-force seat comprises a horizontal top plate and supporting parts on the bottom surface of the top plate, the supporting parts are symmetrical relative to the horizontal and vertical central lines of the top plate, the top plate is provided with a central through hole, the upper end of each supporting part is positioned on the outer side of the central through hole, the lower end of each supporting part is positioned on the outer side of a reserved opening of a tensioning end of a box girder, the piercing jack is arranged on the top plate, a central channel of the piercing jack is aligned with the central through hole, finish rolling deformed steel bars extending out of the box girder are connected with a tensioning rod through an anchor sleeve, the tensioning rod penetrates through the central through hole and the piercing jack, and a locking nut on the tensioning rod is clamped with the top plate of the counter-force seat; the box girder vertical finish rolling deformed steel prestress tension base has high strength and strong stability; the tensioning base is safe and reliable as a whole, is simple and convenient to mount and dismount, and ensures the quality of vertical tensioning.
Description
Technical Field
The utility model belongs to the technical field of the vertical prestressing force tensioning construction of case roof beam, concretely relates to vertical finish rolling screw-thread steel prestressing force tensioning base of case roof beam.
Background
The prestressed concrete continuous (rigid frame) box girder bridge structure system has the advantages of large structural rigidity, smooth driving, few expansion joints, low maintenance cost, suitability for various spans and the like, and has become the first choice of a design scheme of large and medium-span concrete bridges for expressways and cities since the 70 s of the 20 th century. In order to reduce and control the main tensile stress of the box web and prevent the cracking of the web concrete, the arrangement of vertical prestressed tendons on the box girder web has become one of the important contents of the design. The precise threaded steel bar is used as the vertical prestressed reinforcement of the concrete box girder web, the concrete box girder web has the advantages of no welding restriction on connection, convenient anchoring, simple construction, high strength, good relaxation performance and the like, and the application of the precise threaded steel bar vertical prestressed system in the prestressed concrete continuous (rigid frame) box girder bridge with the single span exceeding 100m built and built in China up to now reaches hundreds.
The number of the start-stop piles of the x-river five-model bridge built by the applicant is K9+ 180.08-K9 +928.58, the length of the bridge is 748.5m, and the bridge holes are arranged in a spanning mode (m): (30+28.5)+(75+126+75)+(2*60)+(3*30)+(32+50+32)+(3*30). Full-bridge structural form: the main bridge adopts the short tower cable-stayed bridge, and main bridge deck width is 37m, and the total 1664 of total vertical finish rolling screw-thread steel of main bridge, anchor control stress 588.75Mpa, stretch-draw control stress 503.46KN all use diameter 32mm finish rolling screw-thread steel, overcoat phi 50mm bellows. The YGM-32 type anchorage device is used as the anchorage device, the bottom end is fixed, and the top end is stretched.
The box girder vertical tensioning finish rolling deformed steel bar has a great number, the anchor backing plate is below the girder surface, the reserved opening of the tensioning end is in an inverted trapezoid shape, a jack cannot be effectively attached to the girder surface by using a conventional tensioning method, the finish rolling deformed steel bar cannot be vertically tensioned and anchored in time, and tensioning quality is affected.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an anchor backing plate is less than the concrete beam surface, uses conventional tensioning method jack can not effectively laminate with the beam surface, can not carry out vertical stretch-draw and in time carry out the problem of anchor to the finish rolling screw-thread steel.
The utility model provides a following technical scheme: the utility model provides a vertical finish rolling screw-thread steel prestressing force stretch-draw base of case roof beam, including steel sheet welded counter-force seat, the punching jack, the counter-force seat includes the supporting part of a horizontally roof and roof bottom surface, the horizontal of the relative roof of supporting part, vertical central line symmetry, the roof has a central through-hole, the upper end of each supporting part is located the outside of central through-hole, the lower extreme is located the outside that the mouth was reserved to the end of stretching out of case roof beam, the punching jack is arranged in on the roof, central through-hole is aimed at to its central passage, the finish rolling screw-thread steel that stretches out in the case roof beam passes through the ground tackle sleeve and is connected with the stretch-draw pole, the stretch-draw pole passes central through-hole and punching jack, lock nut on the stretch-draw pole and the roof joint of counter-force seat.
Further, the support portion flares downward from the top plate.
Furthermore, the upper part of the supporting part is connected with the edge of the top plate in a closed mode, a plurality of supporting legs extend out of the lower part of the supporting part, and the supporting part is formed by welding a plurality of panels in a spliced mode.
Furthermore, the top plate is square, the supporting legs correspond to the corners of the top plate one by one, and the supporting legs are formed by butt welding of panels on two sides.
Furthermore, a reinforcing plate is welded at the connecting angle between the supporting leg in the abdominal cavity of the counter-force seat and the top plate.
Further, a horizontal support plate is fixed to the bottom end of the support leg.
Further, a base plate is lined between the locking nut and the top plate, and the finish-rolled deformed steel bar penetrates through the base plate.
Compared with the prior art, the utility model has the advantages that:
the utility model provides a box girder vertical finish rolling deformed steel bar prestress tension base, the strength of the counter-force seat is high, and the stability is strong; the tensioning base is safe and reliable as a whole, is simple and convenient to mount and dismount, and ensures the quality of vertical tensioning.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic view of the reaction force seat.
Fig. 3 is a bottom view of fig. 2.
In the figure: 1-a counter-force seat; 1.1-top plate; 1.2-central through hole; 1.3-legs; 1.4-reinforcing plate; 1.5-horizontal support plate; 2-a center-penetrating jack; 3-stretching a pull rod; 4-locking the nut; 5-backing plate; 6-an anchor sleeve; 7-finish rolling the deformed steel bar.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
As shown in fig. 1; the utility model provides a vertical finish rolling screw-thread steel prestressing force tensioning base of case roof beam, including steel sheet welded counter-force seat 1, punching jack 2, counter-force seat 1 includes the supporting part of a horizontally roof 1.1 and roof 1.1 bottom surface, the relative roof 1.1 of supporting part is horizontal, vertical central line symmetry, roof 1.1 has a central through-hole 1.2, the upper end of each supporting part is located the outside of central through-hole 1.2, the lower extreme is located the outside that the mouth was reserved to the tensioning end of case roof beam, punching jack 2 is arranged in on roof 1.1, central through-hole 1.2 is aimed at to its central passageway, finish rolling screw-thread steel 7 that stretches out in the case roof beam passes through anchorage device sleeve 6 and is connected with stretch-draw bar 3, stretch-draw bar 3 passes central through 1.2 and punching jack 2, lock nut 4 on the stretch-draw bar 3 and the roof joint of counter-force seat 1.
As shown in fig. 2; the supporting part expands downwards from the top plate 1.1, the contact range of the supporting part and the beam surface is enlarged, and the stability is improved.
The supporting part is overall structure, and the upper portion of supporting part and the edge closure of roof 1.1 are connected, and the lower part extends a plurality of landing leg 1.3, and the supporting part is formed by a plurality of panels tailor-welding.
The top plate 1.1 is square, the supporting legs 1.3 correspond to the corners of the top plate 1.1 one by one, and the supporting legs 1.3 are formed by butt welding of panels on two sides.
As shown in fig. 3; a reinforcing plate 1.4 is welded at the connecting angle of the supporting leg 1.3 in the abdominal cavity of the counter-force seat 1 and the top plate 1.1.
The bottom end of the supporting leg 1.3 is fixed with a horizontal supporting plate 1.5, so that the contact area of the supporting leg and a beam surface is increased, and an indentation is prevented from being left on the beam surface.
A backing plate 5 is also lined between the locking nut 4 and the top plate 1.1, and the finish-rolled deformed steel bar 7 passes through the backing plate 5.
The operation steps
1. Before the tensioning construction, the anchor recess is firstly cleaned, so that the exposed surface of the anchor backing plate is smooth and clean.
2. And secondly, cleaning the external leaked threads at the end part of the prestressed finish-rolled deformed steel bar to ensure that no sundries or concrete residues exist at the thread part.
3. And connecting the tension rod with the anchorage device sleeve to form a tension rod piece, and then connecting the tension rod piece with the end part of the finish-rolled deformed steel bar in a threaded manner.
4. The reaction seat is arranged, so that the tension rod can penetrate out of the central through hole of the reaction seat and can penetrate out of the center-penetrating jack, and the reaction seat is reliably arranged.
5. And installing a center-penetrating jack, tightening a locking nut on the top of the tension rod, and fixing the center-penetrating jack.
6. And (4) starting an oil pump to load to a design force value, and locking a finish rolling deformed steel bar tensioning end nut by using a double offset ring spanner.
7. Unloading the load, returning oil by the penetrating jack to reset, and sequentially dismantling; and performing other vertical finish rolling screw-thread steel tensioning operations according to the same steps.
650KN punching jacks are used in the engineering, the diameter is 20cm, and 22cm square steel plate top plates are designed to ensure that the top plates can be stably pressed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The utility model provides a vertical finish rolling screw-thread steel prestressing force tensioning base of case roof beam which characterized in that: including steel sheet welded reaction seat (1), punching jack (2), reaction seat (1) includes the supporting part of a horizontally roof (1.1) and roof (1.1) bottom surface, the horizontal of the relative roof (1.1) of supporting part, vertical central line symmetry, roof (1.1) has a central through hole (1.2), the upper end of each supporting part is located the outside of central through hole (1.2), the lower extreme is located the outside that the mouth was reserved to the stretch-draw end of case roof beam, punching jack (2) are arranged in on roof (1.1), central through hole (1.2) are aimed at to its central passageway, finish rolling screw-thread steel (7) that stretch out in the case roof beam are connected with stretch-draw pole (3) through ground tackle sleeve (6), stretch-draw pole (3) pass central through hole (1.2) and punching jack (2), lock nut (4) on the stretch-draw pole (3) and the roof joint of roof seat (1).
2. The box girder vertical finish rolling deformed steel bar prestress tension base of claim 1, which is characterized in that: the supporting part expands outwards from the top plate (1.1).
3. The box girder vertical finish rolling deformed steel bar prestress tension base of claim 2, which is characterized in that: the upper part of the supporting part is connected with the edge of the top plate (1.1) in a closed mode, a plurality of supporting legs (1.3) extend from the lower part of the supporting part, and the supporting part is formed by welding a plurality of panels.
4. The box girder vertical finish rolling deformed steel bar prestress tension base of claim 3, which is characterized in that: the top plate (1.1) is square, the supporting legs (1.3) correspond to the corners of the top plate (1.1) one by one, and the supporting legs (1.3) are formed by butt welding of panels on two sides.
5. The box girder vertical finish rolling deformed steel bar prestress tension base of claim 4, which is characterized in that: a reinforcing plate (1.4) is welded at the connecting angle between the supporting leg (1.3) in the abdominal cavity of the counter-force seat (1) and the top plate (1.1).
6. The box girder vertical finish rolling screw-thread steel prestress tension base according to claim 4 or 5, characterized in that: the bottom ends of the supporting legs (1.3) are fixed with horizontal supporting plates (1.5).
7. The box girder vertical finish rolling screw-thread steel prestress tensioning base according to any one of claims 1 to 5, which is characterized in that: and a base plate (5) is also lined between the locking nut (4) and the top plate (1.1), and the finish-rolled deformed steel bar (7) penetrates through the base plate (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220514028.7U CN217438724U (en) | 2022-03-10 | 2022-03-10 | Box girder vertical finish rolling screw-thread steel prestressing force stretch-draw base |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220514028.7U CN217438724U (en) | 2022-03-10 | 2022-03-10 | Box girder vertical finish rolling screw-thread steel prestressing force stretch-draw base |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217438724U true CN217438724U (en) | 2022-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220514028.7U Active CN217438724U (en) | 2022-03-10 | 2022-03-10 | Box girder vertical finish rolling screw-thread steel prestressing force stretch-draw base |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217438724U (en) |
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2022
- 2022-03-10 CN CN202220514028.7U patent/CN217438724U/en active Active
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