CN214871544U - Device for preventing end part from stretching and cracking for precast beam - Google Patents
Device for preventing end part from stretching and cracking for precast beam Download PDFInfo
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- CN214871544U CN214871544U CN202120275535.5U CN202120275535U CN214871544U CN 214871544 U CN214871544 U CN 214871544U CN 202120275535 U CN202120275535 U CN 202120275535U CN 214871544 U CN214871544 U CN 214871544U
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Abstract
The utility model provides a prevent tip stretch-draw crack device for precast beam belongs to bridge construction auxiliary assembly technical field. This prevent tip stretch-draw crack device includes track, base one, base two and glide machanism, and glide machanism includes channel-section steel one, and the top of channel-section steel one is provided with bolt one, and the top of bolt one can be dismantled and be connected with steel sheet one, and base sliding connection is on the track, and steel sheet one is located between base one and the base two and the tip of steel sheet one supports respectively to lean on base one and base two. This prevent tip stretch-draw crack device when stretch-draw operation, base one can slide to the direction that is close to base two along the track, and the tensile stress that the arch camber of release roof beam piece produced avoids the roof beam body to go up tensile stress concentration, prevents that the tip of precast beam from appearing the crack when stretch-draw.
Description
Technical Field
The utility model belongs to the technical field of bridge construction auxiliary assembly, a prevent tip stretch-draw crack device for precast beam is related to.
Background
The beam bridge upper structure has various forms, and the cross section forms of the beam bridge upper structure commonly include rectangular plate beams, hollow plate beams, T beams, box beams and the like, and the stress characteristics of the beam bridge upper structure commonly include simply supported beams, simply supported continuous beams, continuous beams and the like. In recent years, prestressed concrete box girder bridges are widely applied to the construction of domestic highways and urban road viaducts. In order to improve the phenomenon that the early prestressed box girder bridge is commonly wound in a middle span and a lower span after being operated for years, engineers adopt a method for increasing the pre-throwing height and the prestress degree to prolong the service life of the bridge structure.
In the prior art, a pedestal bottom die is adopted for the construction of the precast beam and is a rigid structure combination of concrete-section steel, a step is arranged at a support to prevent the damage of lower concrete when the prestress is tensioned, a box beam template is manufactured and is provided with a blocking section, and the blocking process of a reserved hole of an anchorage device is only reserved after the template removal of the beam template is completed by pouring the beam template.
The above capping process mainly has the following disadvantages: firstly, when a beam plate is tensioned, tensile stress appears when a beam body is arched, and the beam end of a rigid combined pedestal is not provided with a movable space to release the tensile stress, so that the bottom web plate has larger tensile stress, the tensile stress is mainly born by a steel bar and not by concrete, and the concrete is tensioned and cracks easily appear; secondly, the box girder template is of a thin-wall structure with a sealing end section, concentrated stress occurs at the end part of the girder in the tensioning process, and the traditional rigid bottom die cannot release the concentrated stress, so that concrete falling from the sealing end section at the front end of the anchorage device cannot fall along with the main body, and end part cracks are caused.
Disclosure of Invention
The utility model discloses to the above-mentioned problem that prior art exists, provide a prevent tip stretch-draw crack device for precast beam, the utility model aims to solve the technical problem that: how to prevent the end of the precast beam from cracking when being tensioned.
The purpose of the utility model can be realized by the following technical proposal:
the utility model provides a prevent tip stretch-draw crack device for precast beam, a serial communication port, prevent tip stretch-draw crack device includes track, base one, base two and glide machanism, glide machanism includes channel-section steel one, the top of channel-section steel one is provided with bolt one, the top of bolt one can be dismantled and be connected with steel sheet one, a base sliding connection be in on the track, the steel sheet one is located between base one and the base two and the tip of steel sheet one supports and leans on respectively on base one and the base two.
The working principle is as follows: in this prevent tip stretch-draw crack device, a base is used for placing the roof beam body of precast beam, glide machanism's steel sheet one is located between base one and the base two, the top at bolt one can be dismantled to steel sheet one, before the stretch-draw, dismantle the steel sheet one and make the interval have between base one and the base two, during the stretch-draw operation, base one can slide to the direction that is close to base two along the track, release beam piece arch camber tensile stress that produces, avoid the roof beam body to go up tensile stress concentration, prevent that the tip of precast beam from appearing the crack when the stretch-draw.
Preferably, the rails are two, the first base has two ends, and the first base is slidably connected to the two rails.
In foretell an end stretch-draw crack device of preventing for precast beam, one side of base one is provided with elevating system, elevating system includes steel sheet two and steel sheet three, steel sheet two is connected on the track, the bottom of steel sheet three is provided with bolt two, be provided with nut two on the steel sheet two, bolt two threaded connection are in on the nut two, threaded connection has nut one on the bolt one, the connection can be dismantled to steel sheet one on the nut one.
The height of the steel plate III can be adjusted through the rotating bolt II, and when the steel plate III is stretched, the structure can enable the end-sealed section to reserve concrete and have a descending space so as to release compressive stress and better prevent the end part of the precast beam from cracking when the precast beam is stretched.
In foretell an prevent tip stretch-draw crack device for precast beam, prevent tip stretch-draw crack device still includes wedge mechanism, wedge mechanism includes steel sheet four and steel sheet five, steel sheet four is connected on the track, the bottom of steel sheet five is provided with bolt three, the steel sheet is four to be provided with nut three, three threaded connection of bolt are in nut three is last, steel sheet five is located between elevating system and the base.
The first steel plate and the third steel plate are parallel and level, the fifth steel plate is located between the first steel plate and the third steel plate and is lower than the first steel plate and the third steel plate, the first steel plate, the third steel plate and the fifth steel plate form a wedge-shaped groove structure, the third rotating bolt can adjust the height of the fifth steel plate, and therefore the depth of the groove structure is adjusted, and the gradient of a beam piece wedge block is accurately adjusted.
In the device for preventing the end tension crack of the precast beam, the number of the second bolts is two, the second bolts are divided into two rows, and the second bolts in each row are respectively positioned on two sides of the center line of the third steel plate.
The more the second bolts are, the more stable support can be carried out on the third steel plate, preferably, the second bolts are four, and every two bolts form a row and are distributed on two sides of the third steel plate.
In the device for preventing the end tension crack of the precast beam, the number of the first bolts is two, and the first bolts in each row are respectively positioned on two sides of the center line of the first steel plate.
The more the bolts are, the more stable support can be carried out to steel plate one, preferably, the bolts one is four, and every two bolts form a row and are distributed on two sides of steel plate one.
In the device for preventing the end part of the precast beam from being stretched and cracked, the first base comprises a third steel plate and a second channel steel, the second channel steel is fixed at the bottom of the third steel plate, and the second channel steel is two and the two are arranged oppositely.
Compared with the prior art, the utility model has the advantages as follows:
1. this prevent tip stretch-draw crack device when stretch-draw operation, base one can slide to the direction that is close to base two along the track, and the tensile stress that the arch camber of release roof beam piece produced avoids the roof beam body to go up tensile stress concentration, prevents that the tip of precast beam from appearing the crack when stretch-draw.
2. Among this prevent tip stretch-draw crack device, can adjust the height of steel sheet three through rotatory bolt two, this structure can let the end-capping paragraph reserve the concrete and have the decline space to release compressive stress, the better tip that prevents precast beam appears the crack when stretch-draw.
Drawings
FIG. 1 is a schematic structural view of the present end stretch-crack prevention device;
FIG. 2 is a schematic structural view of a sliding mechanism;
FIG. 3 is a schematic structural view of the elevating mechanism;
fig. 4 is a schematic structural view of the wedge mechanism.
In the figure, 1 track; 2, a first base; 3, a second base; 4, a sliding mechanism; 5, first channel steel; 6, a first bolt; 7, first steel plate; 8, a lifting mechanism; 9, a second steel plate; 10, steel plate III; 11, a second bolt; 12, a second nut; 13, a first nut; 14 wedge block mechanism; 15, a fourth steel plate; 16 steel plate five; 17, a third bolt; 18, a third nut; and 19, channel II steel.
Detailed Description
The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in figures 1 and 2, this prevent tip stretch-draw crack device includes track 1, base 2, base two 3 and glide machanism 4, glide machanism 4 includes channel-section steel 5, and the top of channel-section steel 5 is provided with bolt 6, and the top of bolt 6 can be dismantled and be connected with steel sheet 7, and base 2 sliding connection is on track 1, and steel sheet 7 is located between base 2 and base two 3 and the tip of steel sheet 7 supports respectively and leans on base 2 and base two 3.
Base one 2 is used for placing the roof beam body of precast beam, a 7 steel sheet of glide machanism 4 is located between base one 2 and base two 3, a 7 steel sheet can be dismantled and connect at the top of bolt one 6, before the stretch-draw, dismantle and fall a 7 steel sheet and make and have the interval between base one 2 and the base two 3, during the stretch-draw operation, base one 2 can slide to the direction that is close to base two 3 along track 1, release roof beam piece arch camber tensile stress that produces, avoid the roof beam body to go up tensile stress concentration, prevent that the tip of precast beam from appearing the crack when stretch-draw.
Preferably, the rails 1 are two, the base one 2 has two ends, and the base one 2 is slidably connected to the two rails 1.
As shown in fig. 1 and 3, in the embodiment, a lifting mechanism 8 is arranged on one side of a first base 2, the lifting mechanism 8 comprises a second steel plate 9 and a third steel plate 10, the second steel plate 9 is connected to a rail 1, a second bolt 11 is arranged at the bottom of the third steel plate 10, a second nut 12 is arranged on the second steel plate 9, the second bolt 11 is in threaded connection with the second nut 12, a first nut 13 is in threaded connection with a first bolt 6, and a first steel plate 7 is detachably connected to the first nut 13.
The height of the steel plate III 10 can be adjusted through the rotating bolt II 11, and when the steel plate is stretched, the structure can enable the end-sealing section to reserve concrete and have a descending space so as to release compressive stress and better prevent the end part of the precast beam from cracking when the precast beam is stretched.
As shown in fig. 1 and 4, in this embodiment, the end portion tension crack prevention device further includes a wedge block mechanism 14, the wedge block mechanism 14 includes a fourth steel plate 15 and a fifth steel plate 16, the fourth steel plate 15 is connected to the rail 1, a third bolt 17 is disposed at the bottom of the fifth steel plate 16, a third nut 18 is disposed on the fourth steel plate 15, the third bolt 17 is in threaded connection with the third nut 18, and the fifth steel plate 16 is located between the lifting mechanism 8 and the first base 2.
The first steel plate 7 is flush with the third steel plate 10, the fifth steel plate 16 is located between the first steel plate 7 and the third steel plate 10 and is lower than the first steel plate 7 and the third steel plate 10, the first steel plate 7, the third steel plate 10 and the fifth steel plate 16 form a wedge-shaped groove structure, and the third bolt 17 is rotated to adjust the height of the fifth steel plate 16, so that the depth of the groove structure is adjusted, and the gradient of a wedge block of a beam piece is accurately adjusted.
Preferably, the number of the second bolts 11 is several, the second bolts 11 are divided into two rows, and the second bolts 11 in each row are respectively positioned on two sides of the center line of the third steel plate 10.
The more the second bolts 11 are, the more stable the support of the third steel plate 10 can be, preferably, the number of the second bolts 11 is four, and every two second bolts 11 are arranged in a row and distributed on two sides of the third steel plate 10.
Preferably, the number of the bolts one 6 is several, the bolts one 6 are divided into two rows, and the bolts one 6 in each row are respectively positioned on two sides of the center line of the steel plate one 7.
The more the bolts 6 are, the more stable the steel plate 7 can be supported, preferably, the bolts 6 are four, and every two bolts 6 are arranged in a row and distributed on two sides of the steel plate 7.
As shown in fig. 1, in this embodiment, the first base 2 includes a third steel plate 10 and a second channel 19, the second channel 19 is fixed to the bottom of the third steel plate 10, and the second channel 19 is two and is disposed opposite to the second channel.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (6)
1. The utility model provides a prevent tip stretch-draw crack device for precast beam, a serial communication port, prevent tip stretch-draw crack device includes track (1), base (2), base two (3) and glide machanism (4), glide machanism (4) include channel-section steel (5), the top of channel-section steel (5) is provided with bolt (6), the top of bolt (6) can be dismantled and be connected with steel sheet (7), base (2) sliding connection be in on track (1), the tip that steel sheet (7) are located between base (2) and base two (3) and steel sheet (7) supports respectively and leans on base (2) and base two (3).
2. An end stretch-crack prevention device for precast beams according to claim 1, characterized in that one side of the first base (2) is provided with a lifting mechanism (8), the lifting mechanism (8) comprises a second steel plate (9) and a third steel plate (10), the second steel plate (9) is connected on the track (1), the bottom of the third steel plate (10) is provided with a second bolt (11), the second steel plate (9) is provided with a second nut (12), the second bolt (11) is in threaded connection with the second nut (12), the first bolt (6) is in threaded connection with a first nut (13), and the first steel plate (7) is detachably connected on the first nut (13).
3. The end stretch-crack prevention device for the precast beam according to claim 2, characterized in that the end stretch-crack prevention device further comprises a wedge block mechanism (14), the wedge block mechanism (14) comprises a steel plate four (15) and a steel plate five (16), the steel plate four (15) is connected on the track (1), a bolt three (17) is arranged at the bottom of the steel plate five (16), a nut three (18) is arranged on the steel plate four (15), the bolt three (17) is in threaded connection with the nut three (18), and the steel plate five (16) is located between the lifting mechanism (8) and the base one (2).
4. An end stretch crack prevention device for precast beams according to claim 2, wherein the second bolts (11) are several, the second bolts (11) are divided into two rows, and the two rows of the second bolts (11) are respectively located at both sides of the center line of the third steel plate (10).
5. An end stretch crack prevention device for precast beams according to claim 1, wherein the bolts one (6) are several, the bolts one (6) are divided into two rows, and the bolts one (6) of each row are respectively located at both sides of the center line of the steel plate one (7).
6. An end stretch crack prevention device for precast beams according to claim 1, wherein the base one (2) comprises a steel plate three (10) and a channel two (19), the channel two (19) is fixed at the bottom of the steel plate three (10), and the channel two (19) is arranged in two and opposite directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120275535.5U CN214871544U (en) | 2021-01-29 | 2021-01-29 | Device for preventing end part from stretching and cracking for precast beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120275535.5U CN214871544U (en) | 2021-01-29 | 2021-01-29 | Device for preventing end part from stretching and cracking for precast beam |
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| CN214871544U true CN214871544U (en) | 2021-11-26 |
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| CN202120275535.5U Active CN214871544U (en) | 2021-01-29 | 2021-01-29 | Device for preventing end part from stretching and cracking for precast beam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351596A (en) * | 2021-12-31 | 2022-04-15 | 江西省交通工程集团有限公司 | Construction method for preventing end head of precast beam from being tensioned and cracked |
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2021
- 2021-01-29 CN CN202120275535.5U patent/CN214871544U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351596A (en) * | 2021-12-31 | 2022-04-15 | 江西省交通工程集团有限公司 | Construction method for preventing end head of precast beam from being tensioned and cracked |
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