CN215943292U - Side span end mould and precast box girder - Google Patents

Abstract

The application discloses side span end mould reaches and prefabricated case roof beam. This side span end mould includes: the inner side of the beam body end head forms a first pouring cavity; the first tensioning assembly is arranged on the first pouring cavity and is integrally formed with the end head of the beam body; the at least three connecting pieces are respectively arranged at the bottom, two sides and the inner side of the end head of the beam body and are used for respectively fixing the side span end die with the bottom die, the side die and the inner die when the side span end die is installed; the installation plate, support and piece have been reduced to at the concrete placement in-process, can avoid appearing the race mould, form the wrong platform, the end concrete surface that also can avoid leaking thick liquid and lead to easily appears phenomenons such as honeycomb pitted skin, bubble, deckle, can also carry out end and main part once only concreting, avoids appearing shrinkage crack, and the end links up not roundly and smoothly with the roof beam body, and linear not smooth, and appearance quality is poor. The application solves the technical problem of poor concrete pouring quality.

Description

Side span end mould and precast box girder

Technical Field

The application relates to the field of bridge molds, in particular to a side span end mold and a prefabricated box girder.

Background

The inventor finds that in the precast beam prefabricating process, the box girder side span end concrete adopts a plurality of templates, and the defects are obvious: the formwork has more mounting plates, more supports and more abutted seams, and the formwork is easy to run in the concrete pouring process to form a staggered platform; the grout leakage is easy to occur due to the untight abutted seams, so that the phenomena of cellular pitted surface, bubbles, edge drop and the like are easy to occur on the concrete surface of the end; shrinkage cracks are easy to occur on the contact surface of the end for twice concrete pouring, the end is not smoothly jointed with the beam body, the linearity is not smooth, and the appearance quality is poor.

Aiming at the problem of poor concrete pouring quality in the related art, an effective solution is not provided at present.

Disclosure of Invention

The main aim at of this application provides a side span end mould and with prefabricated box girder to solve the poor problem of concrete placement quality.

To achieve the above object, according to one aspect of the present application, an edge-spanning end mold is provided.

The edge-spanning end die according to the application comprises: the inner side of the beam body end head forms a first pouring cavity; the first tensioning assembly is arranged on the first pouring cavity and is integrally formed with the end head of the beam body; and at least three connecting pieces are respectively arranged at the bottom, two sides and the inner side of the end head of the beam body and are used for respectively fixing the bottom die, the side die and the inner die when the side span end die is installed.

Furthermore, a second pouring cavity is formed in the outer side of the end head of the beam body, a second tensioning assembly is arranged in the second pouring cavity, and the second tensioning assembly and the end head of the beam body are integrally formed.

Furthermore, the end of the beam body is in an inverted isosceles trapezoid shape.

Further, the first tensioning assembly and the second tensioning assembly each comprise: the first tensioning boxes are positioned at the waist part close to the end head of the beam body, and the second tensioning boxes are positioned at the bottom part close to the end head of the beam body.

Furthermore, the number of the first tensioning boxes is six, and the three integrally-formed first tensioning boxes near the left waist part and the three integrally-formed first tensioning boxes near the right waist part are symmetrically arranged along the central axis of the end head of the beam body; the two second tensioning boxes are symmetrically arranged along the central axis of the end of the beam body.

Further, the first and second stretching boxes include: the box comprises a box body and an anchor backing plate covering the box body; and the anchor backing plate is provided with a grouting hole matched with the corrugated pipe of the prefabricated box girder.

Further, the three first drawing boxes near the left waist portion and the three first drawing boxes near the right waist portion are arranged in a stepped mode.

Furthermore, a shallow groove is formed on the anchor backing plate.

Further, the connector includes: a flange and a bolt which are matched with each other.

In order to achieve the above object, according to another aspect of the present application, there is provided a precast box girder.

The precast box girder according to the present application includes: the edge-spanning end mould of any preceding claim.

In the embodiment of the application, a first pouring cavity is formed on the inner side of the end head of the beam body in an integrated forming mode; the first tensioning assembly is arranged on the first pouring cavity and is integrally formed with the end head of the beam body; the at least three connecting pieces are respectively arranged at the bottom, two sides and the inner side of the end head of the beam body and are used for respectively fixing the side span end die with the bottom die, the side die and the inner die when the side span end die is installed; the purpose of significantly reducing installation plate, support and piece is reached to realized promoting the technical effect of concrete placement quality, and then solved the poor technical problem of concrete placement quality.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the utility model and do not limit it. In the drawings:

FIG. 1 is one of the schematic structural illustrations of an edge-spanning end mold according to the preferred embodiment of the present application;

FIG. 2 is a second schematic structural view of an edge-spanning end mold according to the preferred embodiment of the present application;

FIG. 3 is a side schematic view of an edge-spanning end die according to an embodiment of the present application.

Reference numerals

1. The end of the beam body; 2. a first casting cavity; 3. a first tensioning assembly; 4. a connecting member; 5. a second casting cavity; 6. a second tensioning assembly; 7. a first draw box; 8. a second tension cassette; 9. a cartridge body; 10. an anchor backing plate; 11. grouting holes; 12. shallow grooves.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, 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 only partial 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.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the utility model and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1-3, the present application relates to an edge-spanning end-die comprising: the inner side of the beam body end 1 forms a first pouring cavity 2; the first tensioning assembly 3 is arranged on the first pouring cavity 2 and is integrally formed with the beam end head 1; and the at least three connecting pieces 4 are respectively arranged at the bottom, two sides and the inner side of the beam body end 1 and are used for respectively fixing the side span end die with the bottom die, the side die and the inner die when the side span end die is installed.

Specifically, the beam body end 1 has the function of being mounted to the end of a prefabricated box beam; the first pouring cavity 2 has the function of enabling cement to form the same shape of a cavity when the cement is poured; the first tensioning assembly 3 has a tensioning function; preferably, the beam body end 1 is in an inverted isosceles trapezoid shape; similarly, the first pouring cavity 2 is also in an inverted isosceles trapezoid shape, and meanwhile, by arranging the first tensioning assembly 3 into the first pouring cavity 2, cement does not enter the position where the first tensioning assembly 3 is arranged when cement is poured; in this way, it is ensured that the desired box girder edge span is formed at the end of the prefabricated box girder after the cement is poured in the first pouring cavity 2. In the embodiment, the beam body end 1 and the first tensioning assembly 3 are integrally formed, and all the components of the beam body end 1 are also integrally formed, so that the number of the module mounting plates and the supports which are spliced into the beam body end 1 can be effectively reduced, the number of splicing seams is also reduced, and in addition, the splicing seams between the beam body end 1 and the first tensioning assembly 3 are also reduced; therefore, in the concrete pouring process, the die running can be effectively avoided, and the slab staggering is formed; the phenomena of honeycomb pitted surface, air bubbles, edge drop and the like on the surface of the concrete caused by leakage of the slurry from the abutted seams can be avoided; meanwhile, when cement is poured, the concrete can be poured together with the main body part of the prefabricated box girder, so that the conditions that the contact surface of the end head for pouring concrete twice is shrunk and cracked, the end head is not smoothly jointed with the girder body, the linearity is not smooth, and the appearance quality is poor are avoided; thereby improving the pouring quality. The connecting piece 4 has the function of fixing the beam body end 1 and the end part of the prefabricated box beam mutually; preferably, the connecting member 4 includes: the flange and the bolt are matched with each other; through the cooperation of flange, bolt, fix the bottom of roof beam body end 1 to the die block that sets up in advance on, fix the both sides of roof beam body end 1 to the side form that sets up in advance on, fix the inboard of roof beam body end 1 on the centre form that sets up in advance to accomplish fixing of roof beam body end 1, be convenient for subsequent cement and pour.

From the above description, it can be seen that the following technical effects are achieved by the present application:

in the embodiment of the application, a first pouring cavity 2 is formed on the inner side of the beam body end head 1 in an integrated forming mode; the first tensioning assembly 3 is arranged on the first pouring cavity 2 and is integrally formed with the beam end head 1; the at least three connecting pieces 4 are respectively arranged at the bottom, two sides and the inner side of the beam body end 1 and are used for being respectively fixed with the bottom die, the side die and the inner die when the side span end die is installed; the purpose of significantly reducing installation plate, support and piece is reached to realized promoting the technical effect of concrete placement quality, and then solved the poor technical problem of concrete placement quality.

Preferably, a second pouring cavity 5 is further formed on the outer side of the beam body end head 1, a second tensioning assembly 6 is arranged in the second pouring cavity 5, and the second tensioning assembly 6 and the beam body end head 1 are integrally formed; the second pouring cavity 5 has the function of enabling cement to form the same shape as the cavity when the cement is poured; the second tensioning assembly 6 has a tensioning function; the second pouring cavity 5 is also in an inverted isosceles trapezoid shape, and meanwhile, the second tensioning assembly 6 is arranged in the second pouring cavity 5, so that cement cannot enter the position where the second tensioning assembly 6 is arranged when cement is poured; in this way, it is ensured that the desired box girder edge span is formed at the end of the prefabricated box girder after the cement is poured in the second pouring cavity 5. In the embodiment, the beam body end 1 and the second tensioning assembly 6 are integrally formed, and all the components of the beam body end 1 are also integrally formed, so that the number of the module mounting plates and the supports which are spliced into the beam body end 1 can be effectively reduced, the number of splicing seams is also reduced, and in addition, the splicing seams between the beam body end 1 and the first tensioning assembly 3 are also reduced; therefore, in the concrete pouring process, the die running can be effectively avoided, and the slab staggering is formed; the phenomena of honeycomb pitted surface, air bubbles, edge drop and the like on the surface of the concrete caused by leakage of the slurry from the abutted seams can be avoided; meanwhile, when cement is poured, the concrete can be poured together with the main body part of the prefabricated box girder, so that the situations that the contact surface of the two-time concrete pouring of the end has shrinkage cracks, the end is not smoothly connected with the girder body, the linearity is not smooth, and the appearance quality is poor are avoided.

Preferably, the first tensioning assembly 3 and the second tensioning assembly 6 each comprise: a plurality of first tensioning boxes 7 located near the waist of the beam body end 1, and a plurality of second tensioning boxes 8 located near the bottom of the beam body end 1; according to the position of the corrugated pipe on the prefabricated box girder, a plurality of first tensioning boxes 7 are respectively arranged at the waist positions corresponding to the beam body end 1 of the side span end die, and a second tensioning box 8 is arranged at the corresponding bottom position, so that the purpose of matching the position of the corrugated pipe can be achieved, and tensioning effects at different positions can be realized.

Preferably, the number of the first tensioning boxes 7 is six, and the three integrally-formed first tensioning boxes 7 near the left waist portion and the three integrally-formed first tensioning boxes 7 near the right waist portion are symmetrically arranged along the central axis of the beam body end head 1; the number of the second tensioning boxes 8 is two, and the two second tensioning boxes 8 are symmetrically arranged along the central axis of the beam body end 1. Three first tension boxes 7 positioned at the left waist part and three first tension boxes 7 positioned at the right waist part are arranged according to the positions and the number of the corrugated pipes on the prefabricated box girder, so that the matching of the tension boxes and the corrugated pipes is realized; the three first pulling boxes 7 positioned at the left waist part and the three first pulling boxes 7 positioned at the right waist part are integrally formed, so that the abutted seams among the first pulling boxes 7 are eliminated, and the pouring quality is further improved; in addition, in order to maintain the aesthetic property of the side span of the precast box girder which is finally poured, three first tensioning boxes 7 near the left waist portion and three first tensioning boxes 7 near the right waist portion are symmetrically arranged along the central axis of the girder body end head 1, and two second tensioning boxes 8 are symmetrically arranged along the central axis of the girder body end head 1.

Preferably, the first and second tensioning cassettes 7 and 8 include: the box comprises a box body 9 and an anchor backing plate 10 covering the box body 9; the anchor backing plate 10 is provided with a grouting hole 11 matched with a corrugated pipe of the prefabricated box girder; the corrugated pipe on the prefabricated box girder extends out of the grouting hole 11 of the anchor backing plate 10; before the end forms are closed, the corrugated pipes are threaded out of the anchor backing plate 10 one by one and are threaded in at the same time. The movement of the two sides of the end die needs to be synchronously followed, so that overlarge difference and hard prying of a violent top are prevented, and the corrugated pipe is extruded and deformed.

Preferably, three of the first drawing boxes 7 near the left waist portion and three of the first drawing boxes 7 near the right waist portion are arranged in a stepped manner. Preferably, the anchor pad 10 is formed with a shallow groove 12. The stepped and shallow groove 12 arrangement can strengthen the protection of the anchor sealing port and is beneficial to tensioning and anchor sealing construction.

The end mold installation process is as follows:

(1) and (5) cleaning concrete grout on the surface of the end mould and at the position of the sealing rubber strip, and replacing or repairing the damaged sealing rubber strip.

(2) And (4) uniformly brushing a release agent.

(3) The anchor backing plate 10 is installed. When the anchor backing plate 10 is installed, the anchor backing plate 10 is closely attached to a template, the grouting holes 11 of the anchor backing plate 10 are required to be upward, and the anchor backing plates 10 of different models are correspondingly aligned one by one during installation, so that the anchor backing plates cannot be installed wrongly.

(4) And (6) hoisting the end die. When in hoisting, the end mould is horizontal. Before the end forms are closed, the corrugated pipes are threaded out of the anchor backing plate 10 one by one and are threaded in at the same time. The movement of the two sides of the end die needs to be synchronously followed, so that overlarge difference and hard prying of a violent top are prevented, and the corrugated pipe is extruded and deformed.

(5) And after the end die is in place, connecting and fixing the end die with the side die, the bottom die and the inner die.

The end mold dismantling process comprises the following steps:

(1) and after the beam concrete is poured and maintained, the strength of the beam reaches 80% of the designed strength, and then the template can be dismantled. When the mold is removed, the difference between the temperature of the concrete core and the temperature of the concrete surface, the temperature of the concrete surface and the environment is not more than 15 ℃, and the mold is not suitable to be removed when strong wind or the temperature changes rapidly. In cold seasons, the mold should not be removed when the ambient temperature is lower than 0 ℃. In hot and strong wind drying seasons, the mould is disassembled section by section, and the side cover is disassembled simultaneously. The following requirements should be met when the mold is removed.

The template is dismantled in the opposite direction according to the template erecting sequence.

And secondly, the detached parts are strictly forbidden to be thrown, should be lightly taken and lightly placed, cleaned in time, oiled, classified and stacked.

And thirdly, the template is timely trimmed when being damaged or deformed greatly during dismantling, so that the continuous usability of the template is ensured.

(2) End die stripping

Firstly, before the end mold is removed, the inner mold is removed from the mold, and the side mold is removed or removed.

Secondly, when the end die is demoulded, the beam body is prevented from being damaged.

And thirdly, during demoulding, the beam body is prevented from being damaged by pulling hard prying.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. An edge-spanning end die, comprising: the inner side of the beam body end head forms a first pouring cavity; the first tensioning assembly is arranged on the first pouring cavity and is integrally formed with the end head of the beam body; and the at least three connecting pieces are respectively arranged at the bottom, two sides and the inner side of the end head of the beam body and are used for respectively fixing the side span end die with the bottom die, the side die and the inner die when the side span end die is installed.

2. The edge-span end formwork of claim 1, wherein a second casting cavity is further formed outside the beam body end, and a second tensioning assembly is arranged in the second casting cavity and is integrally formed with the beam body end.

3. The edge-spanning end mold of claim 1, wherein said beam body ends are in the shape of an inverted isosceles trapezoid.

4. The edge-spanning end mold of claim 2, wherein the first and second tensioning assemblies each comprise: the first tensioning boxes are positioned at the waist part close to the end head of the beam body, and the second tensioning boxes are positioned at the bottom part close to the end head of the beam body.

5. The edge-spanning end die of claim 4, wherein the first tension box is six, and three integrally formed first tension boxes near the left waist portion and three integrally formed first tension boxes near the right waist portion are symmetrically arranged along the central axis of the beam end; the two second tensioning boxes are symmetrically arranged along the central axis of the end of the beam body.

6. The edge-spanning end die of claim 5, wherein the first and second tensioning cassettes comprise: the box comprises a box body and an anchor backing plate covering the box body; and the anchor backing plate is provided with a grouting hole matched with the corrugated pipe of the prefabricated box girder.

7. The edge-spanning end die of claim 5, wherein three of said first draw boxes adjacent a left waist portion and three of said first draw boxes adjacent a right waist portion are all in a stepped arrangement.

8. The edge-span end die of claim 6, wherein the anchor backing plate is formed with a shallow groove.

9. The edge-spanning end mold of claim 1, wherein said connector comprises: a flange and a bolt which are matched with each other.

10. A precast box girder, comprising: the edge-spanning end mould of any one of claims 1 to 9.

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