CN214530155U

CN214530155U - Prefabricated box girder

Info

Publication number: CN214530155U
Application number: CN202022979049.XU
Authority: CN
Inventors: 朱超凡; 齐增祥; 呼清亮
Original assignee: Beijing Xinjiangfeng Building Materials Co ltd
Current assignee: Beijing Xinjiangfeng Building Materials Co ltd
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-10-29
Anticipated expiration: 2030-12-09

Abstract

The application relates to a precast box girder, including roof, bottom plate and be located first web and the second web between roof and the bottom plate, enclose into a cavity, its characterized in that between roof, bottom plate and first web and the second web: and a plurality of pre-stressing devices are arranged at the top between the first web and the second web and are arranged at intervals along the length direction of the top plate. This application has the intensity that improves the bridge surface, reduces the effect that the case roof beam breaks off.

Description

Prefabricated box girder

Technical Field

The application relates to the field of box girder technology, in particular to a prefabricated box girder.

Background

The box girder is one of bridge construction projects, and the inside is hollow form, divide into single case and many cases. The box girder generally includes a top plate, a bottom plate and web plates at both sides, and the box girder of the reinforced concrete structure is divided into a prefabricated box girder and a cast-in-place box girder. The box girder combined bridge girder erection machine prefabricated in the independent site can be erected after the lower project is completed, the project progress can be accelerated, and the construction period can be saved. The box girder is generally made of concrete, and a bridge for passing a vehicle or the like is located above the box girder.

In view of the above-mentioned related art, the inventor believes that the bridge is often passed by vehicles and the like, and the bridge is used for a long time, so that the phenomenon of cracking and the like of the surface of the bridge is easily caused, thereby causing danger.

SUMMERY OF THE UTILITY MODEL

In order to improve the intensity on bridge surface, reduce the cracked risk of case roof beam emergence, this application provides a prefabricated case roof beam.

The application provides a precast box girder adopts following technical scheme:

a precast box girder comprises a top plate, a bottom plate, a first web and a second web, wherein the first web and the second web are positioned between the top plate and the bottom plate, a cavity is enclosed between the top plate, the bottom plate, the first web and the second web, and the precast box girder is characterized in that: and a plurality of pre-stressing devices are arranged at the top between the first web and the second web and are arranged at intervals along the length direction of the top plate.

Through adopting above-mentioned technical scheme, make the roof of case roof beam produce relative prestressing force through prestressing force device to can effectual improvement roof's life.

Optionally, the prestress device includes a steel strand located between the first web and the second web, one end of the steel strand is connected to the first web, the second web is provided with a tensioning structure, and the tensioning structure pulls one end of the steel strand, which is far away from the first web, so that the steel strand is in a tensioned state.

Through adopting above-mentioned technical scheme, through pulling of taut structure to steel strand wires to make steel strand wires carry out relative pulling to the web of both sides, thereby produce the effect of prestressing force to the roof.

Optionally, taut structure includes the fixing base, the fixing base includes relative first fixed plate and the second fixed plate that sets up from top to bottom and is located the third fixed plate between first fixed plate and the second fixed plate, set up the third through-hole that supplies the steel strand wires to pass on the third fixed plate, the steel strand wires external fixation has the thread bush, the thread bush passes the third through-hole, threaded connection has the lock cover on the thread bush, the lock cover laminating deviates from one side of first web at the third fixed plate.

Through adopting above-mentioned technical scheme, thereby through rotating the lock sleeve with the screw thread cover towards the one side pulling of second web to drive the steel strand wires and remove towards one side of second web, thereby produce relative prestressing force.

Optionally, a plurality of limiting holes communicated with the third through hole are formed in the third fixing plate, limiting blocks are arranged on the threaded sleeve, the limiting blocks are in the same number and one-to-one correspondence with the limiting holes, and the limiting blocks are embedded into the limiting holes.

By adopting the technical scheme, the steel strand cannot rotate through the limiting hole and the limiting block, so that the service life of the steel strand is prolonged, and the possibility of breakage caused by rotation of the steel strand is reduced.

Optionally, the inboard of first web is provided with the supporting seat, one side that the supporting seat deviates from first web is provided with the set casing, one side that the set casing was towards the second web is provided with first through-hole, the steel strand wires certainly first through-hole stretches into in the set casing, thereby be provided with in the set casing with thereby the steel strand wires hold tightly the holder that makes the position line relatively fixed of steel strand wires and set casing.

Through adopting above-mentioned technical scheme, make the gradual clamp of steel strand wires tight through the centre gripping subassembly to it is more firm to make the fixed of the steel strand wires that are located the stiff end.

Optionally, the clamping member includes a first clamping piece and a second clamping piece, which are disposed opposite to each other, and the first clamping piece and the second clamping piece clamp the steel strand inside the first through hole.

Through adopting above-mentioned technical scheme, make through the relative tight piece of clamp that sets up to produce inward extrusion force to the steel strand wires to make the clamp of steel strand wires tight more firm.

Optionally, one side of the first clamping piece and one side of the second clamping piece, which are away from each other, are respectively provided with an annular ring groove, an elastic piece is arranged inside the ring groove, and the first clamping piece and the second clamping piece are fixed through the elastic piece.

Through adopting above-mentioned technical scheme, press from both sides tight piece through the elastic component with first clamp and the second is pressed from both sides tight piece and is fixed to make first clamp to press from both sides tight piece and the laminating of second clamp on the steel strand.

Optionally, a joint of the first web and the bottom plate is arc-shaped, and a joint of the second web and the bottom plate is arc-shaped.

Through adopting above-mentioned technical scheme, through the curved connection that sets up to make the distribution of stress more even, thereby reduced stress concentration's harm.

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

1. the use time of the top plate can be effectively prolonged through the arranged prestress device, and the cracking condition of the top plate is reduced.

2. Thereby increase prestressing force through rotating the latch fitting for operating personnel is convenient for operate, saves operating personnel's working strength.

3. Make more firm of steel strand wires through fixed knot constructs, be difficult for making the steel strand wires drop.

Drawings

Fig. 1 is a schematic view of the overall structure of a precast box girder in the embodiment of the present application;

fig. 2 is a schematic view of a fixing structure of a precast box girder in an embodiment of the present application;

fig. 3 is an exploded view of a fixed structure of a precast box girder in an embodiment of the present application;

fig. 4 is a schematic view of a tension structure of the precast box girder in the embodiment of the present application;

fig. 5 is a side view of a tensioning structure of a precast box girder in the embodiment of the present application.

Description of reference numerals: 1. a top plate; 11. a flange plate; 12. a web; 121. a first web; 122. a second web; 13. a base plate; 2. a prestressing device; 21. a fixed structure; 211. a supporting seat; 2111. a stationary case; 2112. a first through hole; 212. a clamping piece; 2121. a first clip piece; 2122. a second clip; 2123. an elastic ring; 2124. a second through hole; 2125. a ring groove; 22. a tensioning structure; 221. a fixed seat; 2211. a first fixing plate; 2212. a second fixing plate; 2213. a third fixing plate; 2214. a third through hole; 3. steel strand wires; 31. a threaded sleeve; 32. a lock sleeve; 4. a rotation stopping structure; 41. a limiting ring; 42. a limiting block; 43. and a limiting hole.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses prefabricated box girder. Referring to fig. 1 and 2, the precast box girder includes a top plate 1 horizontally arranged, flange plates 11 are respectively arranged at two ends of the top plate 1, the flange plates 11 are arc-shaped plates and the flange plates 11 and the top plate 1 are of an integral structure, a web 12 relatively inclined towards the inside from top to bottom is arranged at the lower end of the opposite flange plate 11, the web 12 and the flange plates 11 are of an integral structure, the web 12 includes a first web 121 and a second web 122 which are oppositely arranged, a bottom plate 13 parallel to the top plate 1 is arranged at the lower end of the first web 121 and the second web 122 which are oppositely arranged, the bottom plate 13 and the web 12 are of an integral structure, a connecting position between the bottom plate 13 and the web 12 is of an arc-shaped structure, and a cavity is formed between the top plate 1, the flange plates 11, the web 12 and the bottom plate 13.

Be located the inside of cavity, be provided with prestressing device 2 on the relative web 12, prestressing device 2 is including fixing fixed knot structure 21 on first web 121, fixed knot constructs 21 including the supporting seat 211 of bolt fastening on first web 121, supporting seat 211 passes through bolt fixed connection on first web 121, the central point that is located supporting seat 211 puts and is provided with set casing 2111, set casing 2111 is wedge-shaped hollow casing, be integrated into one piece between set casing 2111 and the supporting seat 211, one side that set casing 2111 deviates from first web 121 is vertical plane.

Referring to fig. 1 and 3, a clamping piece 212 is provided inside the fixing case 2111, and the clamping piece 212 has a wedge-shaped structure with respect to the fixing case 2111. The clamping piece 212 includes a first clamping piece 2121 and a second clamping piece 2122 which are oppositely arranged, an annular ring groove 2125 is formed on an outer ring of the clamping piece 212, an elastic ring 2123 is arranged inside the ring groove 2125, the elastic ring 2123 abuts against the inside of the ring groove 2125, and the first clamping piece 2121 and the second clamping piece 2122 are clamped and fixed through the elastic ring 2123.

The steel strand 3 is arranged in the center of the clamping piece 212, and the steel strand 3 is horizontally arranged. The fixing shell 2111 is provided with a first through hole 2112 at a position corresponding to the steel strand 3, and the clamping piece 212 is provided with a second through hole 2124 at a position corresponding to the steel strand 3. The steel strand 3 extends from the second through hole 2124 into the interior of the web 12 and is fixed to the interior of the first web 121.

The diameter of the clamping piece 212 close to one side of the first web plate 121 is larger than that of the first through hole 2112, the diameter of the clamping piece 212 away from one side of the first web plate 121 is smaller than that of the first through hole 2112, so that the clamping piece 212 can extend out of the first through hole 2112, and the fixing shell 2111 and the clamping piece 212 are wedge-shaped, so that when the steel strand 3 moves towards one end away from the first web plate 121, the steel strand 3 drives the clamping piece 212 to move towards one end away from the position of the first web plate 121, so that the clamping force between the clamping piece 212 and the steel strand 3 is increased, and the clamping piece 212 and the steel strand 3 are fixed.

Referring to fig. 1 and 4, a tensioning structure 22 is disposed on the second web 122, the tensioning structure 22 is disposed opposite to the fixing structure 21, the tensioning structure 22 includes a fixing seat 221 fixed on the second web 122, the fixing seat 221 includes a first fixing plate 2211 horizontally disposed, the first fixing plate 2211 is fixedly connected to the second web 122, a second fixing plate 2212 is horizontally disposed below the first fixing plate 2211, the first fixing plate 2211 is disposed opposite to the second fixing plate 2212, the second fixing plate 2212 is fixedly connected to the second web 122, a third fixing plate 2213 is vertically disposed at one end of the first fixing plate 2211 and one end of the second fixing plate 2212 far away from the second web 122, and the third fixing plate 2213, the first fixing plate 2211 and the second fixing plate 2212 are integrally formed.

A third through hole 2214 is formed in the third fixing plate 2213 in a position opposite to the position of the steel strand 3, the steel strand 3 penetrates through the third through hole 2214, a threaded sleeve 31 is sleeved at one end, close to the third fixing plate 2213, of the steel strand 3, and the threaded sleeve 31 is fixedly connected to the steel strand 3. The threaded sleeve 31 is sleeved with a lock sleeve 32 at one side of the third fixing plate 2213 close to the second web 122, the lock sleeve 32 is in threaded connection with the threaded sleeve 31, and one side of the lock sleeve 32 departing from the second web 122 is in rotational connection with the third fixing plate 2213.

Referring to fig. 4 and 5, a rotation stopping structure 4 is disposed on one side of the threaded sleeve 31 departing from the second fixing plate 2212, the rotation stopping structure 4 includes a limiting ring 41 fixed to the steel strand 3, the diameter of the limiting ring 41 is the same as that of the third through hole 2214, so that the limiting ring 41 can extend into the third through hole 2214, four limiting blocks 42 are disposed on the side wall of the limiting ring 41 along the circumferential direction at equal intervals, and the limiting blocks 42 and the limiting ring 41 are of an integral structure. The position, relative to the limiting block 42, of the circumferential direction of the third through hole 2214 is provided with a limiting hole 43, the third fixing plate 2213 is penetrated through the limiting hole 43, the shape and size of the limiting hole 43 are the same as the horizontal direction projection of the limiting block 42 on the third fixing plate 2213, and the limiting hole 43 is communicated with the third through hole 2214, so that the limiting block 42 can extend into the limiting hole 43, and the steel strand 3 is prevented from rotating.

The prestressing device 2 is arranged in a plurality at equal intervals along the horizontal direction of the inner side of the web 12, so that a correspondingly uniform prestressing can be applied to the opposite inner side of the web 12.

The implementation principle of a precast box girder of the embodiment of this application does: an operator rotates the lock sleeve 32 to drive the steel strand 3 to move towards one side close to the second web 122, the fixing structure 21 located at one end of the first web 121 passes through the wedge-shaped clamping piece 212 and the wedge-shaped fixing shell 2111, when the steel strand 3 moves towards one side away from the first web 121, the steel strand 3 drives the clamping piece 212 to move towards one side away from the first web 121, so that the clamping piece 212 and the fixing shell 2111 are clamped, and the steel strand 3 is fixed on one side of the fixing structure 21. So that the tensile force to which the steel strand 3 is subjected is gradually increased, thereby increasing the prestress inside the top plate 1.

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 precast box girder comprising a top plate (1), a bottom plate (13), and a first web (121) and a second web (122) between the top plate (1) and the bottom plate (13), a cavity being enclosed between the top plate (1), the bottom plate (13), and the first web (121) and the second web (122), characterized in that: a plurality of pre-stressing devices (2) are arranged at the top between the first web (121) and the second web (122), and the pre-stressing devices (2) are arranged at intervals along the length direction of the top plate (1).

2. The precast box girder of claim 1, wherein: the prestress device (2) comprises a steel strand (3) located between a first web plate (121) and a second web plate (122), one end of the steel strand (3) is connected with the first web plate (121), a tensioning structure is arranged on the second web plate (122), and one end, far away from the first web plate (121), of the steel strand (3) is pulled by the tensioning structure (22), so that the steel strand (3) is in a straightening state.

3. The precast box girder of claim 2, wherein: taut structure (22) includes fixing base (221), fixing base (221) include relative first fixed plate (2211) and second fixed plate (2212) that set up from top to bottom and be located third fixed plate (2213) between first fixed plate (2211) and second fixed plate (2212), set up third through-hole (2214) that supply steel strand wires (3) to pass on third fixed plate (2213), steel strand wires (3) external fixation has thread bush (31), thread bush (31) pass third through-hole (2214), threaded connection has lock sleeve (32) on thread bush (31), one side that deviates from first web (121) at third fixed plate (2213) is laminated in lock sleeve (32).

4. The precast box girder of claim 2, wherein: the inboard of first web (121) is provided with supporting seat (211), one side that supporting seat (211) deviates from first web (121) is provided with stationary housing (2111), stationary housing (2111) is provided with first through-hole (2112) towards one side of second web (122), thereby steel strand wires (3) certainly first through-hole (2112) stretch into in stationary housing (2111), thereby be provided with in stationary housing (2111) with thereby steel strand wires (3) are held tightly and are made the clamping piece of the position line relatively fixed of steel strand wires (3) and stationary housing (2111).

5. The precast box girder of claim 3, wherein: the third fixing plate (2213) is provided with a plurality of limiting holes (43) communicated with the third through holes (2214), the thread sleeve (31) is provided with limiting blocks (42), the limiting blocks (42) are in the same number and are in one-to-one correspondence with the limiting holes (43), and the limiting blocks (42) are embedded into the limiting holes (43).

6. The precast box girder of claim 4, wherein: the clamping piece comprises a first clamping piece (212) and a second clamping piece (212) which are arranged oppositely, and the first clamping piece (212) and the second clamping piece (212) clamp the steel strand (3) in the first through hole (2112).

7. The precast box girder of claim 6, wherein: the sides of the first clamping piece (212) and the second clamping piece (212) which are opposite to each other are respectively provided with an annular ring groove (2125), an elastic piece is arranged inside the ring groove (2125), and the first clamping piece (2121) and the second clamping piece (2122) are fixed through the elastic piece.

8. The precast box girder of claim 1, wherein: the joint of the first web (121) and the bottom plate (13) is arc-shaped, and the joint of the second web (122) and the bottom plate (13) is arc-shaped.