CN112523093B - Prestressed lengthening device and method - Google Patents
Prestressed lengthening device and method Download PDFInfo
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- CN112523093B CN112523093B CN202011332672.4A CN202011332672A CN112523093B CN 112523093 B CN112523093 B CN 112523093B CN 202011332672 A CN202011332672 A CN 202011332672A CN 112523093 B CN112523093 B CN 112523093B
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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
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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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
Abstract
The application discloses prestressing force extension device and extension method relates to the technical field of bridge construction, and this extension device sets up the minimum region of hogging moment at continuous beam bridge, and the both sides of extension device are first region, second region respectively, and the extension device includes: a plurality of first prestressed tendons and second prestressed tendons; at least two bridge panels connected in sequence, wherein at least one first prestressed tendon is anchored on one side of each bridge panel, which is far away from the first area, and at least one second prestressed tendon is anchored on one side of each bridge panel, which is far away from the second area; meanwhile, the first prestressed tendon penetrates through the first area and the bridge deck, one end of the first prestressed tendon on the bridge deck is a first tensioning end, and the other end of the first prestressed tendon is a first anchoring end; the second prestressed tendons penetrate through the bridge deck and the second area, one end of each second prestressed tendon on the bridge deck is a second anchoring end, and the other end of each second prestressed tendon is a second tensioning end. This application can be segmented the dispersion and set up anchor point, stretch-draw point, when realizing the purpose to lengthening of prestressing force, still reduced the requirement to the bridge deck plate thickness.
Description
Technical Field
The application relates to the technical field of bridge construction, in particular to a prestress lengthening device and a prestress lengthening method.
Background
The prestressed tendons in the concrete continuous beam constructed step by step are usually tensioned from the first span to the double ends, the other spans to the single ends, the traditional steel truss-concrete combined beam and the traditional steel box-concrete combined beam are only provided with longitudinal prestress in a negative bending moment area, the positive bending moment area is not provided with the longitudinal prestress, and the negative bending moment area provided with the prestress is often provided with a sawtooth block.
Among them, the longer tendons are generally lengthened using an extender. When the longitudinal prestressed tendons arranged in the hogging moment area need to be lengthened and tensioned, a prestressed lengthening device is generally adopted to lengthen the bridge deck meeting the thickness requirement. The installation prestressing force extension ware still need reserve the notch of broad on the longitudinal bridge of decking is to the limit side, and the reinforcing bar of horizontal bridge needs to break off, influences the decking atress, and the sawtooth piece sets up too much and also does not do not benefit to the decking prefabrication, and influences that the structure is pleasing to the eye.
Disclosure of Invention
The embodiment of the application provides a prestress lengthening device and a prestress lengthening method, which can be used for setting anchor points and tensioning points in a segmented and dispersed manner, and can reduce the requirement on the thickness of a bridge deck plate while achieving the purpose of lengthening prestress.
In a first aspect, an embodiment of the present application provides a prestressed lengthening device, where the lengthening device is disposed in a region where a negative bending moment of a continuous beam bridge is minimum, and two sides of the lengthening device are respectively a first region and a second region, including:
a plurality of first tendons;
a plurality of second prestressed tendons;
at least two bridge decks connected in sequence, wherein at least one first prestressed tendon is anchored on one side of each bridge deck, which is far away from the first area, and at least one second prestressed tendon is anchored on one side of each bridge deck, which is far away from the second area;
meanwhile, the first prestressed tendon penetrates through the first area and the bridge deck, one end of the first prestressed tendon on the bridge deck is a first tensioning end, and the other end of the first prestressed tendon on the bridge deck is a first anchoring end;
the second prestressed tendons penetrate through the bridge deck and the second area, one end of each second prestressed tendon on the bridge deck is a second anchoring end, and the other end of each second prestressed tendon is a second tensioning end.
In some embodiments, the number of the bridge deck is 2 to 4.
In some embodiments, at least two of the first tendons are anchored to the deck slab or at least two of the second tendons are anchored to the deck slab.
In some embodiments, the number of the first tendons anchored to each deck slab sequentially increases or decreases, and the number of the second tendons sequentially decreases or increases.
In some embodiments, the deck slab comprises:
a main body;
the anchoring groove is formed in the anchoring side of the main body, and the anchoring end of the second prestressed tendon is arranged in the anchoring groove;
and the tensioning notch is formed in the tensioning side of the main body, and the tensioning end of the first prestressed tendon is arranged in the tensioning notch.
In some embodiments, the deck slab further comprises:
and the inverted notch is matched and arranged on the tensioning side of the main body and is butted with the anchoring notch on the adjacent bridge deck.
In a second aspect, an embodiment of the present application further provides a prestressed lengthening method based on the above prestressed lengthening device, including:
step A: sequentially erecting at least two bridge deck plates along the direction from the first area to the second area, and sequentially installing and tensioning at least one first prestressed tendon on each bridge deck plate;
and B: and after all the bridge decks are erected, at least one second prestressed tendon is installed and anchored on each bridge deck.
In some embodiments, in the step a, the step of installing the first tendons on two adjacent bridge decks includes:
erecting a first bridge deck, installing at least one first prestressed tendon on the first bridge deck and the first area, and tensioning all the first prestressed tendons on one side of the first bridge deck, which is far away from the first area;
and erecting a second bridge deck, installing at least one first prestressed tendon on the second bridge deck, the first bridge deck and the first area, and tensioning all the first prestressed tendons on one side, far away from the first area, of the second bridge deck.
In some embodiments, in step a, the method further includes:
and sequentially arranging a first grouting cover at the tensioning end of the first prestressed tendon on each bridge deck.
In some embodiments, after all the bridge decks are erected, the method further comprises:
and (4) synchronously grouting through all the first grouting covers.
The beneficial effect that technical scheme that this application provided brought includes:
(1) the embodiment of the application provides a prestressing force extension device, at the minimum region of hogging moment of continuous bridge, adopt stagger on the decking of difference and set up the stretch-draw point, the anchor point, adopt the form of segmentation dispersion to carry out the stretch-draw to the decking through first prestressing tendons, and erect the back that finishes at the decking, anchor each decking as the anchor end of second prestressing tendons, can reduce the requirement to deck slab thickness, make first prestressing tendons and the cross distribution of second prestressing tendons on all decking connect, the connection reliability between each decking has both been guaranteed, the extension purpose to prestressing force has also been realized.
(2) The prestress lengthening device is characterized in that at least two bridge decks are sequentially erected, prestress tensioning is carried out after one bridge deck is erected, a segmented dispersed tensioning mode is adopted, the connection quality of the bridge decks is good, and the requirement for the thickness of the bridge decks can be reduced.
(3) In this embodiment, after the stretch-draw is accomplished to first prestressing tendons on a decking, set up first mud jacking cover at the stretch-draw end of first prestressing tendons promptly to after all stretch-draw ends have all set up first mud jacking cover, through the synchronous mud jacking of all first mud jacking covers, effectively improve the efficiency of construction, avoided adopting prestressing force to connect long ware inside pressure drop not full and need the loaded down with trivial details drawback of work load that the mud jacking process of repetitious repetition leads to.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a top view of a prestressed lengthening device according to an embodiment of the present disclosure;
FIG. 2 is a top view of another pre-stressed extension apparatus provided in accordance with an embodiment of the present application;
FIG. 3 is an enlarged view at I of FIG. 2 (with the jack removed);
FIG. 4 is an enlarged view taken at J of FIG. 2;
FIG. 5 is an enlarged view taken at K in FIG. 2;
in the figure: 1. a first tendon; 2. a second tendon; 3. a bridge deck; 31. a main body; 32. an anchor notch; 33. stretching the notch; 34. a reversed notch; 41. a first anchor; 42. a second anchor; 43. tensioning a jack; 51. a first grouting cover; 52. and a second grouting cover.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 to 5, an embodiment of the present application provides a prestressed lengthening device, where the lengthening device is disposed in an area where a negative bending moment of a continuous bridge is minimum, and two sides of the lengthening device are a first area and a second area, respectively, and the prestressed lengthening device includes:
a plurality of first tendons 1;
a plurality of second prestressed tendons 2;
at least two bridge decks 3 connected in sequence, wherein at least one first prestressed tendon 1 is anchored on one side of each bridge deck 3, which is far away from the first area, and at least one second prestressed tendon 2 is anchored on one side of each bridge deck 3, which is far away from the second area;
meanwhile, the first prestressed tendon 1 is arranged on the first area and the bridge deck 3 in a penetrating mode, one end, on the bridge deck 3, of the first prestressed tendon 1 is a first tensioning end, and the other end of the first prestressed tendon 1 is a first anchoring end;
the second prestressed tendons 2 penetrate through the bridge deck 3 and the second area, one ends of the second prestressed tendons 2 on the bridge deck 3 are second anchoring ends, and the other ends of the second prestressed tendons are second tensioning ends.
The embodiment of the application provides a prestressing force extension device, and its theory of operation mainly is:
as shown in fig. 1, the direction from the first area to the second area is a construction direction of the bridge during erection, that is, at least two bridge decks 3 are arranged along a longitudinal bridge direction, and an extension area is arranged between the first area and the second area, in the embodiment of the present application, a first bridge deck 3a and a second bridge deck 3b are sequentially arranged from the first area to the second area, the first tendons 1 are all tensioned and anchored on the corresponding bridge decks 3, the tensioning ends of the first tendons 1 are all far away from the first area, as can be seen from fig. 1, one first tendon 1 is arranged on the first bridge deck 3a, two first tendons 1 are arranged on the second bridge deck 3b, and the anchoring ends of the first tendons 1 are all arranged on the first area;
after the first tendons 1 on the first bridge deck 3a and the second bridge deck 3b are all tensioned, the bridge decks in the second area are continuously erected (in the embodiment of the present application, if there is no particular limitation, the "bridge deck" indicates the bridge deck in the lengthening device), finally, the second tendons 2 are arranged on the second area, the anchoring ends of the second tendons 2 are all arranged on the side of each bridge deck 3 away from the second area, and the second tendons 2 are tensioned on the second area, so that the lengthening of the prestressing force is realized. At this time, the first prestressed tendons 1 and the second prestressed tendons 2 in the lengthening area are in a staggered distribution form on the bridge deck 3, and therefore the purpose of prestressed lengthening is achieved.
The embodiment of the application provides a pair of prestressing force extension device, adopt to stagger on the decking 3 of difference and set up the stretch-draw point, the anchor point, adopt the form of segmentation dispersion to carry out stretch-draw to decking 3 through first prestressing tendons 1, and all erect at decking 3 and finish the back, anchor each decking 3 as the anchor end of second prestressing tendons 2, can reduce the requirement to 3 thickness of decking, make first prestressing tendons 1 and the connection of 2 cross distribution of second prestressing tendons on all decking 3, the connection reliability between each decking 3 has both been guaranteed, the extension purpose to prestressing force has also been realized.
In the embodiment of the application, the first prestressed tendons 1 and the second prestressed tendons are distributed on the bridge decks 3 in a crossed mode, so that lengthening devices are avoided, and the requirement for plate thickness is lowered.
Meanwhile, the first prestressed tendons 1 and the second prestressed tendons 2 are arranged oppositely on the whole, so that the tensile force of all the first prestressed tendons 1 can be dispersed on all the bridge decks 3, and the anchoring force of all the second prestressed tendons 2 can be dispersed on all the bridge decks 3.
Therefore, the prestressing force extension device in this application embodiment is along indulging the bridge and to the decking segmentation, staggers the stretch-draw through a plurality of first prestressing tendons 1 gradation, and the anchor is stagger to a plurality of second prestressing tendons 2, has reduced the thickness requirement of decking 3. Therefore, the tension points and the anchor points can be dispersedly arranged in sections, the requirement on the thickness of the bridge deck is lowered, and the connection reliability among a plurality of bridge decks is guaranteed.
In actual construction, the prestressed lengthening device of the embodiment of the application is generally arranged at a position where a hogging moment area of a bridge is small, because the number of the prestressed tendons on a single bridge deck 3 is relatively small based on a form that the first prestressed tendons 1 and the second prestressed tendons are distributed in a crossed manner under the condition that the number of the prestressed channels is not changed, and therefore, the integral prestress is also reduced. When the hogging moment is too large, the smaller tensile force cannot resist the larger hogging moment to cause the phenomenon of inverted arch, so that the prestress lengthening device in the embodiment of the application is required to be arranged at the position with the smaller hogging moment of the bridge.
In the embodiment of the present application, the continuous bridge bending moment is calculated in advance, a region with the minimum negative bending moment is found, and a plurality of bridge decks 3 are arranged in the minimum region, where the minimum region is the position with the small negative bending moment of the bridge, and the minimum region is close to the zero bending moment region.
Further, the number of the bridge deck boards 3 is 2-4. When the number of the bridge deck plates 3 is not less than two, the force can be dispersed and acted on the bridge deck plates 3, and the requirement on the thickness of only one bridge deck plate 3 is reduced; when the number of the bridge deck boards 3 is too large, too many times of tensioning easily causes tensioning waste. In actual construction, 2-4 bridge decks 3 are used for construction anchoring and lengthening in most cases. In the present embodiment, as shown in fig. 2, the number of the bridge deck 3 is three.
Preferably, at least two first tendons 1 are anchored to the bridge deck 3, or at least two second tendons 2 are anchored to the bridge deck 3. When the number of the prestressed tendons on each bridge deck 3 is not less than two, the decomposition of the tensile force and the anchoring force can be realized on one bridge deck 3, and the lengthening of the prestressed force is easier to realize.
Preferably, the number of the first tendons 1 anchored to each deck slab 3 is sequentially increased or decreased, and the number of the second tendons 2 is sequentially decreased or increased. The more the bridge deck plates 3 are penetrated by the prestressed tendons, the more the tensioning force is needed, so the prestressed tendons for tensioning are increased in one direction or decreased in a descending manner, and the increasing and decreasing order is determined according to the erection direction of the bridge deck plates.
As shown in fig. 3 to 5, in particular, the bridge deck 3 includes:
a main body 31;
an anchoring slot 32 opened on an anchoring side of the main body 31, an anchoring end of the second tendon 2 being provided in the anchoring slot 32;
and a tension notch 33 opened at a tension side of the body 31, and a tension end of the first tendon 1 is provided in the tension notch 33.
In the embodiment of the present application, the anchoring notches 32 and the tensioning notches 33 are both formed on the main body 31, so as to facilitate splicing and erection between the plurality of bridge decks 3.
In some embodiments, the bridge deck 3 further comprises:
an inverted notch 34 adapted to open on the tensioned side of the body 31 and to interface with the anchor notch 32 on the adjacent deck 3.
In the embodiment of the present application, the inverted notch 34 is opposite to the anchoring notch 32 to form a larger space for the anchoring end of the tendon to be constructed later, because the anchorage in the anchoring notch 32 is performed after the second tendon 2 is anchored on each deck slab 3, which often requires a larger space. The tensioning end of the first prestressed tendon 1 is arranged on the tensioning notch 33, and when the tensioning is carried out, the next bridge deck 3 is not erected, and in order to further ensure the quality of the bridge deck 3, the inverted notch 34 is not formed.
Specifically, the first tendon 1 is tensioned by a first anchorage 41 in the tensioning slot 33, a tensioning jack 43, and the tensioning jack 43 is removed after tensioning. The second tendon 2 is anchored by a second anchorage 42 in the anchoring slot 32.
After the first prestressed tendon 1 is tensioned, the tensioning jack 43 is removed, and a first grouting cover 51 is installed on the tensioning notch 33; after the second prestressed tendons 2 are anchored and tensioned, the second grouting cover 52 is installed on the anchoring notch 32.
On the other hand, an embodiment of the present application further provides a prestress lengthening method of the prestress lengthening device, including:
step A: sequentially erecting at least two bridge decks 3 along the first area to the second area, and sequentially installing and tensioning at least one first prestressed tendon 1 on each bridge deck 3;
and B: after all the bridge decks 3 are erected, at least one second prestressed tendon 2 is installed and anchored on each bridge deck 3.
The prestress lengthening method includes the steps that at least two bridge decks 3 are sequentially erected, first prestress ribs 1 on each bridge deck 3 are sequentially tensioned, a segmented tensioning mode is adopted, connection quality of the bridge decks is good, and requirements for thickness of the bridge decks can be reduced.
In the step a, the step of installing the first tendons on two adjacent bridge decks 3 includes:
erecting a first bridge deck 3, installing at least one first prestressed tendon 1 on the first bridge deck 3 and the first area, and tensioning all the first prestressed tendons 1 on one side, far away from the first area, of the first bridge deck 3;
erecting a second bridge deck 3, installing at least one first prestressed tendon 1 on the second bridge deck 3, the first bridge deck 3 and the first area, and tensioning all the first prestressed tendons 1 on one side, far away from the first area, of the second bridge deck 3.
In this embodiment, the steps of erecting and tensioning a plurality of bridge decks 3 are the same, taking the construction of three bridge decks 3 in a prestressed lengthening device as an example, the three bridge decks 3 are marked as a first bridge deck 3a, a second bridge deck 3b and a third bridge deck 3c, each bridge deck is pre-provided with a prestressed duct according to actual requirements, firstly, the first bridge deck 3a is erected, a first prestressed tendon 1 is arranged on the first bridge deck 3a in a penetrating manner and tensioned manner, after the tensioning is completed, a tensioning jack is removed and the first prestressed tendon 1 is anchored, and the tensioned end of the first prestressed tendon 1 is in a first area; similarly, a second bridge deck 3b and a third bridge deck 3c are erected in sequence and the first prestressed tendons 1 on the second bridge deck are tensioned; after the bridge deck 3 in the extension area is erected, the bridge deck on the second area is erected backwards continuously, finally, the second prestressed tendons 2 penetrate through the bridge deck on the second area and the bridge deck on the extension area, the second prestressed tendons 2 are anchored in the anchoring notches 32 in the bridge deck in each extension area, and the second prestressed tendons 2 are tensioned on the bridge deck on the second area, so that the extension of the prestressed force is realized.
In the step a, the method further includes:
and a first grouting cover 51 is sequentially arranged on the tensioning end of the first prestressed tendon 1 on each bridge deck 3.
Furthermore, when all the bridge decks 3 are erected, the method further comprises:
the grouting is synchronized by all the first grouting caps 51.
And after the second prestressed tendon 2 is tensioned on the second area, a second grouting cover is arranged at the tensioning end of the second prestressed tendon 2. And after all the second grouting covers are installed, synchronous grouting is carried out on the corresponding prestressed duct through all the second grouting covers at one time.
Specifically, a first grouting cover 51 is arranged at both the tensioning end and the anchoring end of the first prestressed tendon 1; and second grouting covers 52 are arranged at the tensioning end and the anchoring end of the second prestressed tendon 2 to realize circulating grouting and ensure grouting quality.
In this embodiment, after the grouting covers on the tensioning end of the first prestressed tendon 1 and the tensioning end of the second prestressed tendon are respectively and completely installed, grouting is synchronously performed respectively, so that the construction efficiency is effectively improved, and the defect that the workload is complicated due to the fact that the internal pressure drop of the prestressed lengthening device is not full easily and the grouting process needs to be repeated for many times is avoided.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. 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 application. Thus, the present application 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 (10)
1. The utility model provides a prestressing force extension device, this extension device sets up the minimum region of hogging moment at continuous beam bridge, and the both sides of extension device are first region, second region respectively, its characterized in that includes:
a plurality of first tendons (1);
a plurality of second prestressed tendons (2);
at least two bridge panels (3) connected in sequence, wherein at least one first prestressed tendon (1) is anchored on one side of each bridge panel (3) far away from the first area, and at least one second prestressed tendon (2) is anchored on one side of each bridge panel (3) far away from the second area;
meanwhile, the first prestressed tendon (1) penetrates through the first area and the bridge deck (3), one end of the first prestressed tendon (1) on the bridge deck (3) is a first tensioning end, and the other end of the first prestressed tendon (1) is a first anchoring end;
the second prestressed tendons (2) penetrate through the bridge deck (3) and the second area, one ends of the second prestressed tendons (2) on the bridge deck (3) are second anchoring ends, and the other ends of the second prestressed tendons are second tensioning ends.
2. A prestressed lengthening device according to claim 1, wherein said bridge deck (3) is present in a number of 2 to 4.
3. A prestressed elongation arrangement as claimed in claim 1, characterized in that at least two of said first tendons (1) are anchored to said deck slab (3) or at least two of said second tendons (2) are anchored to said deck slab (3).
4. A prestressed lengthening device according to claim 1, characterised in that the number of first tendons (1) anchored to each deck slab (3) increases or decreases in succession and the number of second tendons (2) decreases or increases in succession.
5. A prestressed lengthening device according to claim 1, characterized in that said bridge deck (3) comprises:
a main body (31);
an anchoring slot (32) opened on an anchoring side of the main body (31), an anchoring end of the second tendon (2) being provided in the anchoring slot (32);
and the tensioning notch (33) is formed in the tensioning side of the main body (31), and the tensioning end of the first prestressed tendon (1) is arranged in the tensioning notch (33).
6. A prestressed lengthening device according to claim 5, characterized in that said bridge deck (3) further comprises:
an inverted notch (34) adapted to open on the tensioned side of the body (31) and to interface with an anchor notch (32) on an adjacent bridge deck (3).
7. A prestress elongation method based on the prestress elongation device of any one of claims 1 to 6, comprising:
step A: sequentially erecting at least two bridge deck boards (3) along the direction from the first area to the second area, and sequentially installing and tensioning at least one first prestressed tendon (1) on each bridge deck board (3);
and B: after all the bridge decks (3) are erected, at least one second prestressed tendon (2) is installed and anchored on each bridge deck (3).
8. A prestressed lengthening method according to claim 7, wherein in said step A, the step of installing the first tendons of two adjacent bridge decks (3) comprises:
erecting a first bridge deck (3), installing at least one first prestressed tendon (1) on the first bridge deck (3) and the first area, and tensioning all the first prestressed tendons (1) on one side, far away from the first area, of the first bridge deck (3);
erecting a second bridge deck (3), installing at least one first prestressed tendon (1) on the second bridge deck (3), the first bridge deck (3) and the first area, and tensioning all the first prestressed tendons (1) on one side, far away from the first area, of the second bridge deck (3).
9. The pre-stress elongation method of claim 8, wherein in the step a, further comprising:
and a first grouting cover (51) is arranged at the tensioning end of the first prestressed tendon (1) on each bridge deck (3) in sequence.
10. A prestressed lengthening method according to claim 9, characterized in that, when all the bridge decks (3) are erected, it further comprises:
and synchronously grouting by all the first grouting covers (51).
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| CN202011332672.4A CN112523093B (en) | 2020-11-24 | 2020-11-24 | Prestressed lengthening device and method |
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| CN202011332672.4A CN112523093B (en) | 2020-11-24 | 2020-11-24 | Prestressed lengthening device and method |
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