CN110295547B - Construction method of continuous rigid frame bridge prestressed tendon - Google Patents
Construction method of continuous rigid frame bridge prestressed tendon Download PDFInfo
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- CN110295547B CN110295547B CN201910730152.XA CN201910730152A CN110295547B CN 110295547 B CN110295547 B CN 110295547B CN 201910730152 A CN201910730152 A CN 201910730152A CN 110295547 B CN110295547 B CN 110295547B
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- prestressed
- corrugated pipe
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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Abstract
The invention belongs to the technical field of bridge construction, and particularly discloses a construction method of a prestressed tendon of a continuous rigid frame bridge, which comprises the following steps: step A, preparing before penetrating; b, bidirectional prestressed beam penetration: penetrating from two sides of the prestressed corrugated pipe, positioning a retaining ring at the end part of the prestressed corrugated pipe during penetrating, penetrating the head of a steel bundle into the retaining ring, fastening the retaining ring, gradually penetrating the steel bundle into the prestressed corrugated pipe, driving the retaining ring to move to the other end of the prestressed corrugated pipe during movement of the steel bundle, loosening the retaining ring after the single bundle penetrating of the steel bundle is finished, dropping a steel bar in the retaining ring to the inner bottom of the prestressed corrugated pipe, cutting off the steel bundle, and penetrating the single bundle of the steel bundle from the other end of the prestressed corrugated pipe according to the method, and repeating the steps until the penetrating is finished; c, tensioning the prestressed tendons; and D, grouting the pipeline.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a construction method of a prestressed tendon of a continuous rigid frame bridge.
Background
The continuous rigid frame bridge is a structural system commonly used in the construction of large-span bridges, and refers to a continuous beam bridge with a pier body and a main beam fixedly integrated, a multi-span rigid frame bridge with main spans as continuous beams and a multi-span continuous-rigid frame bridge, which all adopt prestressed concrete structures.
The prestressing force technique that the bridge adopted adds the pulling force in the component in advance for it bears the tensile stress to be exerted prestressing force tensile component, and then makes it produce certain deformation, deals with the load that structure itself received, including the load of component self weight, wind load, snow load, earthquake load effect etc..
The existing prestressed tension method usually adopts a post-tensioning method, wherein the post-tensioning method comprises the steps of firstly pouring concrete, reserving the position of a prestressed tendon pore channel, tensioning the prestressed tendon after the strength of the concrete reaches a specified value, and anchoring by using an anchorage device, and the concrete procedures comprise the procedures of prestressed pipeline laying, concrete pouring, prestressed steel bundle penetrating, prestressed steel bundle tensioning, pipeline grouting and the like.
When the existing steel bundle is threaded, after the steel bundle is threaded to reach a certain preset length, a worker holds the abrasive wheel cutting machine to cut off the steel bundle, the head of the steel bundle can contact the inner wall of the prestressed corrugated pipe or other steel bundles in the prestressed corrugated pipe, the resistance is large when the head of the steel bundle is threaded, and the steel bundle is threaded insufficiently and smoothly. In order to increase the smoothness of the steel bundle penetrating, a sleeve head is usually sleeved on the head of the steel bundle to protect the head of the steel bundle, so that the steel bundle can penetrate into the prestressed pipeline more smoothly. Although the resistance of the head of the steel bundle is reduced by performing the head covering treatment on the head of the steel bar, the head of the steel bundle still has large resistance and the steel bundle is not smoothly penetrated. And the head of the steel bundle is sleeved, so that the process of threading is increased, and the cost is increased due to the fact that more sleeves are manufactured.
Disclosure of Invention
The invention aims to provide a construction method of a prestressed tendon of a continuous rigid frame bridge, which aims to solve the problem that the existing prestressed steel beam is not smoothly penetrated due to large head resistance of the steel beam when penetrating.
In order to achieve the purpose, the invention adopts the following technical scheme:
the construction method of the continuous rigid frame bridge prestressed tendon comprises the following steps:
step A, preparation before bundle penetration:
preparing a guide rib, penetrating a retaining ring capable of sliding along the guide rib on the guide rib, wherein the bottom of the retaining ring is provided with an opening capable of being sealed, then penetrating the guide rib into the prestressed corrugated pipe, cutting off the parts of the two ends of the guide rib, which are exposed out of the end face of the prestressed corrugated pipe, welding fasteners at the two ends of the guide rib, reversely folding the fasteners by using a wrench so as to clamp the fasteners at the end part of the corrugated pipe, fixing the guide rib in the prestressed corrugated pipe, and enabling the guide rib to be positioned at the top in the prestressed corrugated pipe;
b, bidirectional prestressed beam penetration:
penetrating from two sides of the prestressed corrugated pipe, positioning a retaining ring at the end part of the prestressed corrugated pipe during penetrating, penetrating the head of a steel bundle into the retaining ring, fastening the retaining ring, gradually penetrating the steel bundle into the prestressed corrugated pipe, driving the retaining ring to move to the other end of the prestressed corrugated pipe during movement of the steel bundle, loosening the retaining ring after the single bundle penetrating of the steel bundle is finished, dropping a steel bar in the retaining ring to the inner bottom of the prestressed corrugated pipe, cutting off the steel bundle, and penetrating the single bundle of the steel bundle from the other end of the prestressed corrugated pipe according to the method, and repeating the steps until the penetrating is finished;
c, tensioning the prestressed tendons;
and D, grouting the pipeline.
The principle of the scheme is as follows:
the guide ribs are fixed in the prestressed corrugated pipe and serve as a sliding track and a supporting mechanism of the retaining ring, when a single bundle is penetrated, the head of the steel bundle penetrates through the retaining ring, and the retaining ring and the head of the steel bundle are fixed together.
This scheme of adoption can reach following technological effect:
1. when the single bundle is threaded, the retaining ring can move along with the steel bundle, so that the head of the steel bundle can be always lifted up by the retaining ring, the head of the steel bundle is prevented from contacting the inner wall of the prestressed corrugated pipe or other steel bundles in the prestressed corrugated pipe in the threading process, and the head of the steel bundle is free of resistance and is threaded more smoothly.
2. The structure guided by the retaining ring is matched with bidirectional threading, so that the threading speed equal to that of unidirectional threading can be achieved.
3. The step of sleeving the head of the steel bundle in the prior art is omitted, and the use of the sleeve is reduced, so that the cost for manufacturing the sleeve is saved.
Further, step A still includes the installation strengthening rib: and fixing a plurality of reinforcing ribs on the inner wall of the prestressed corrugated pipe in the same way as the guide ribs, and uniformly arranging the reinforcing ribs on the inner wall of the prestressed corrugated pipe. The strengthening rib can strengthen the intensity of prestressing force bellows, and prestressing force bellows is difficult to warp.
Furthermore, a plurality of annular grooves are formed in the outer side of the reinforcing rib. When the pipeline is pressed to the thick liquid, the thick liquids can flow in each ring channel of strengthening rib to be full of whole prestressing force corrugated pipe, the thick liquids is filled more evenly.
Further, the retaining ring is a spring buckle. The spring buckle has simple structure and is convenient to open and release.
Further, the inner side of the retaining ring is provided with an anti-slip layer. The anti-slip layer can increase the friction force between the retaining ring and the steel bundle, and the retaining ring and the steel bundle are not easy to slip.
Furthermore, the anti-skid layer is an elastic rubber layer. The elastic rubber layer can increase the friction force on one hand and can also increase the resistance between the elastic rubber layer and the steel beam through the elastic deformation of the elastic rubber layer.
Further, when the length of the steel bundle is within 50m, artificial threading is adopted. The short steel bundles below 50m are usually manually penetrated.
And further, when the length of the steel bundle exceeds 50m, the steel bundle is penetrated by a strand penetrating machine. The long steel bundles with the diameter of more than 50m are usually threaded manually by a thread-threading machine.
Further, the strand penetrating machine is a 5T winch. The 5T winch is compact in structure and convenient to use and transfer, and is an optimal bunching device.
Further, in the step A, when the head of the steel bundle penetrates into the retaining ring, the length of the head of the steel bundle penetrating through the retaining ring is more than 0.8 m. When the head of the steel bundle moves from one end of the prestressed pipeline to the other end of the prestressed corrugated pipe, the head of the steel bundle just can extend out of the end of the prestressed corrugated pipe by at least 0.8m, and the steel bundle penetrating standard is met.
Drawings
FIG. 1 is a side view of a first embodiment of the present invention;
FIG. 2 is a front cross-sectional view of a first embodiment of the present invention;
fig. 3 is a front sectional view of the anchor end in embodiment 3 of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a prestressed corrugated pipe 1, a guide rib 2, a fastener 20, a retaining ring 3, a reinforcing rib 4 and an anchoring end 5.
Example one
The embodiment is suitable for the length of the steel bundle within 50 m.
The construction method of the continuous rigid frame bridge prestressed tendon comprises the following steps:
step A, preparation before bundle penetration:
as shown in fig. 1 and 2, a guide rib 2, a plurality of reinforcing ribs 4, and a retaining ring 3 are prepared, and the number of reinforcing ribs 4 is seven in this embodiment. The structure of the buckle 3 is as shown in fig. 1, and includes a sliding ring 31 located at the upper part and a guide ring 32 located at the lower part, the bottom of the guide ring 32 has an opening that can be closed, the guide ring 32 is a spring buckle (similar to the structure of a key ring in the prior art), and an anti-slip layer made of elastic rubber is fixed inside the guide ring 32.
Penetrate the guide rib 2 with the slip ring 31 of buckle 3 earlier, then penetrate the prestressing force bellows 1 with guide rib 2 and strengthening rib 4, expose the part of prestressing force bellows 1 terminal surface with guide rib 2 and strengthening rib 4 both ends and cut off, and at the equal welding fastener 20 in guide rib 2 and strengthening rib 4 both ends, thereby buckle 20 inflection card is at prestressing force bellows 1 tip with the spanner, realize the fixed of guide rib 2 and strengthening rib 4 in prestressing force bellows 1, and make guide rib 2 be located prestressing force bellows 1 roof portion, guide rib 2 and a plurality of strengthening rib 4 distribute along 1 inner wall circumference of prestressing force bellows, guide rib 2 is convenient for the slip of buckle 3, and guide rib 2 and a plurality of strengthening rib 4 can play the effect of reinforcing to prestressing force bellows 1. In order to avoid the displacement of the fasteners 20 at the two ends of the guide rib 2 on the prestressed corrugated pipe 1 when the retaining ring 3 slides on the guide rib 2, the fasteners 20 at the two ends of the guide rib 2 may be welded to the prestressed corrugated pipe 1.
B, bidirectional prestressed beam penetration:
penetrating from two sides of a prestressed corrugated pipe 1, firstly enabling a retaining ring 3 to be located at the end of the prestressed corrugated pipe 1 during penetrating, penetrating the head of a steel bundle into the retaining ring 3, enabling the head of the steel bundle to penetrate through the retaining ring 3 to be longer than 0.8m, fastening the retaining ring 3, then gradually penetrating the steel bundle into the prestressed corrugated pipe 1, driving the retaining ring 3 to move to the other end of the prestressed corrugated pipe 1 during the movement of the steel bundle, loosening the retaining ring 3 after the single bundle penetrating of the steel bundle is completed, enabling a steel bar in the retaining ring 3 to fall to the inner bottom of the prestressed corrugated pipe 1, then cutting off the steel bundle, then performing the single bundle penetrating of the steel bundle from the other end of the prestressed corrugated pipe 1 according to the method, and circulating the above steps until the bundle penetrating is completed;
c, tensioning the prestressed tendons;
and D, grouting the pipeline. In order to facilitate the filling of the slurry in the prestressed corrugated pipe 1 to be more uniform, a plurality of annular grooves can be formed in the outer surface of the reinforcing rib 4, and during the grouting of the pipeline, the slurry can flow in each annular groove of the reinforcing rib, so that the whole prestressed corrugated pipe 1 is filled with the slurry, and the slurry is filled more uniformly.
The principle of the invention is as follows:
the guide ribs 2 are fixed in the prestressed corrugated pipe 1, the guide ribs 2 are used as a sliding track and a supporting mechanism of the retaining ring 3, when a single bundle is threaded, the head of the steel bundle penetrates through the retaining ring 3, the retaining ring 3 is fixed with the head of the steel bundle, therefore, when the steel bundle is threaded, the retaining ring 3 can synchronously move along with the steel bundle, the head of the steel bundle can be always lifted by the retaining ring 3, the steel bundle always moves along the upper part in the prestressed corrugated pipe 1 when the steel bundle is threaded, the head of the steel bundle can not contact with the inner wall of the prestressed corrugated pipe 1 or other steel bundles in the prestressed corrugated pipe 1, the head of the steel bundle has no resistance, and compared with the structure of the head sleeve of the steel bundle adopted when the steel bundle is threaded, the resistance of the head of the steel bundle is greatly reduced, and the steel bundle is threaded more smoothly.
Compared with the existing one-way beam penetrating technology, the two-way beam penetrating technology has the advantages that:
1. according to the invention, the snap ring 3 is fixed with the head of the steel bundle, so that the snap ring 3 can synchronously move along with the steel bundle when the steel bundle is threaded, the snap ring 3 can always lift the head of the steel bundle, the steel bundle is threaded and always moves along the upper part in the prestressed corrugated pipe 1, and the head of the steel bundle cannot contact the inner wall of the prestressed corrugated pipe 1 or other steel bundles in the prestressed corrugated pipe 1, so that the head of the steel bundle has no resistance.
2. The structure guided by the retaining ring 3 is matched with bidirectional beam penetration, so that the beam penetration speed equal to that of unidirectional beam penetration can be achieved.
3. The step of sleeving the head of the steel bundle in the prior art is omitted, and the use of the sleeve is reduced, so that the cost for manufacturing the sleeve is saved.
Example two
The difference between this embodiment and the first embodiment is: in the embodiment, the manual threading is not adopted, but the 5T winch is adopted for threading. The embodiment is suitable for the steel bundle with the length of more than 50 m.
EXAMPLE III
The present embodiment is different from the first and second embodiments in that: and (3) installing an anchoring end 5 of the steel bundle between the step (B) and the step (C), wherein in the installation process, the anchoring end 5 is aligned to the end part of the prestressed corrugated pipe 1, then the fastener 2 at the end part of each reinforcing rib 4 is buckled on the anchoring end 5 by a spanner, and then the fastener 2 and the anchoring end 5 are fixed together by a fastening bolt, so that the connection strength between the prestressed corrugated pipe 1 and the anchoring end 5 can be enhanced.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. The construction method of the continuous rigid frame bridge prestressed tendon is characterized by comprising the following steps:
step A, preparation before bundle penetration:
preparing a guide rib, penetrating a retaining ring capable of sliding along the guide rib on the guide rib, wherein the bottom of the retaining ring is provided with an opening capable of being sealed, then penetrating the guide rib into the prestressed corrugated pipe, cutting off the parts of the two ends of the guide rib, which are exposed out of the end face of the prestressed corrugated pipe, welding fasteners at the two ends of the guide rib, reversely folding the fasteners by using a wrench so as to clamp the fasteners at the end part of the corrugated pipe, fixing the guide rib in the prestressed corrugated pipe, and enabling the guide rib to be positioned at the top in the prestressed corrugated pipe;
still including the installation strengthening rib: fixing a plurality of reinforcing ribs on the inner wall of the prestressed corrugated pipe in the same way as the guide ribs, and enabling the reinforcing ribs to be uniformly arranged on the inner wall of the prestressed corrugated pipe; a plurality of annular grooves are formed in the outer side of the reinforcing rib;
b, bidirectional prestressed beam penetration:
penetrating from two sides of the prestressed corrugated pipe, positioning a retaining ring at the end part of the prestressed corrugated pipe during penetrating, penetrating the head of a steel bundle into the retaining ring, fastening the retaining ring, gradually penetrating the steel bundle into the prestressed corrugated pipe, driving the retaining ring to move to the other end of the prestressed corrugated pipe during movement of the steel bundle, loosening the retaining ring after the single bundle penetrating of the steel bundle is finished, dropping a steel bar in the retaining ring to the inner bottom of the prestressed corrugated pipe, cutting off the steel bundle, and penetrating the single bundle of the steel bundle from the other end of the prestressed corrugated pipe according to the method, and repeating the steps until the penetrating is finished;
c, tensioning the prestressed tendons;
and D, grouting the pipeline.
2. The continuous rigid frame bridge prestressed tendon construction method of claim 1, characterized in that: the retaining ring is a spring buckle.
3. The continuous rigid frame bridge prestressed tendon construction method of claim 2, characterized in that: the inner side of the retaining ring is provided with an anti-slip layer.
4. The continuous rigid frame bridge prestressed tendon construction method of claim 3, wherein: the anti-slip layer is an elastic rubber layer.
5. The continuous rigid frame bridge prestressed tendon construction method of claim 1, characterized in that: when the length of the steel bundle is within 50m, artificial bundle penetration is adopted.
6. The continuous rigid frame bridge prestressed tendon construction method of claim 1, characterized in that: and when the length of the steel bundle exceeds 50m, the steel bundle is penetrated by a strand penetrating machine.
7. The continuous rigid frame bridge prestressed tendon construction method of claim 6, wherein: the strand pulling machine is a 5T winch.
8. The continuous rigid frame bridge prestressed tendon construction method of claim 1, characterized in that: in the step A, when the head of the steel bundle penetrates into the retaining ring, the length of the head of the steel bundle penetrating through the retaining ring is more than 0.8 m.
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