CN114603683A - Method for quickly prefabricating concrete segment box girder - Google Patents

Abstract

The invention discloses a method for quickly prefabricating a concrete segment box girder, which comprises the following two steps: the method comprises the following steps: dividing box girder segments in the same prefabrication sequence, wherein any box girder segment prefabrication sequence is divided into two girder segments, wherein the two girder segments comprise N rectangular girder segments and N-1 middle girder segments; step two: prefabricating the segmental box girder, namely prefabricating rectangular girder segments, pouring a middle girder segment between any two adjacent rectangular girder segments, and prefabricating all box girder segments in a sequence. The method is an optimized segment division method and a corresponding segment stub matching prefabricating method, so that the box-type segments in the same prefabricating sequence can be prefabricated and assembled quickly, and the problems of complicated matched beam positioning work and low prefabricating efficiency in the traditional stub matching method during beam segment prefabrication are solved.

Description

Method for quickly prefabricating concrete segment box girder

Technical Field

The invention relates to the field of a segment beam prefabrication and assembly method. More particularly, the invention relates to a method for quickly prefabricating a concrete segment box girder.

Background

The segment beam manufacturing method mostly uses a short line matching method. In a general stub matching method, except that a first section is prefabricated by adopting a fixed end die and a movable end die, other sections all use the fixed end die as a template at one end during prefabrication, a prefabricated front section is adopted as an end die at the other end, after the rear section is manufactured, the front section is lifted away, the rear section becomes an end die of a new section, and the steps are repeated in such a circulating way. The method has extremely high precision requirement on the matching beam, the plane position, the levelness and the verticality need to be adjusted and measured during installation, then the inner die, the bottom die and the side die are connected, a plurality of control points need to be arranged on the top surface and the bottom surface of the end die, and calibration is carried out on the measuring tower.

In the existing stub matching method, except for the first section, other beam sections need to complete matching and checking of the matched beam, the matching precision requirement is high, so the process is long in time consumption, along with the development of science and technology and economy, the prefabrication process of the traditional stub method is difficult to meet the increasingly improved social requirements in the aspects of construction efficiency, energy conservation, environmental protection and the like, and the requirement on a more efficient section prefabrication method is increasingly urgent.

Disclosure of Invention

The invention aims to provide a method for quickly prefabricating a concrete segment box girder, which is an optimized segment division method and a corresponding segment stub matching prefabricating method, so as to realize the quick prefabricating and assembling of box segments in the same prefabricating sequence and solve the problems of complicated matched girder positioning work and low prefabricating efficiency when the girder segments are prefabricated by a traditional stub matching method.

To achieve these objects and other advantages and in accordance with the purpose of the invention, a method for rapidly prefabricating a concrete segment box girder is provided, which includes the steps of:

the method comprises the following steps: dividing box girder segments in the same prefabrication sequence, wherein the box girder segments in the same prefabrication sequence are divided into two girder segments, wherein the two girder segments comprise N rectangular girder segments and N-1 middle girder segments;

step two: prefabricating the segmental box girder, namely prefabricating rectangular girder segments at first, and then pouring a middle girder segment between any two adjacent rectangular girder segments to finish prefabricating all box girder segments in a sequence.

Preferably, in the step one, the prefabrication mode of the rectangular beam section is the same as the manufacturing process of the first section beam section.

Preferably, when the bridge is longitudinally provided with the flat bends, the middle beam section is in a trapezoidal beam section.

Preferably, in the second step, any two adjacent rectangular beam sections are used as end molds to cast the middle beam section in the middle.

Preferably, the rectangular beam section is prefabricated by using a fixed end mould and a movable end mould as end moulds at two ends.

Preferably, the fixed end die and the movable end die are in the form of spline teeth.

Preferably, the specific prefabrication method of the rectangular beam section is as follows:

s1, mounting and checking a fixed end die;

s2, positioning and locking the movable end die;

s3, hoisting a reinforcement cage, tensioning a top screw, and installing a side die and a bottom die;

s4, pouring and maintaining concrete;

and S5, demolding the movable end mold after maintenance is finished, arranging the movable end mold at the same position after the rectangular beam section is lifted to the modification area to perform prefabrication of the next rectangular beam section, and basically, the movable end mold does not need to be repositioned again.

Preferably, the specific manufacturing method of the intermediate beam section is as follows:

s1, installing a bottom die in place;

s2, positioning the rectangular beam sections on the two sides as matching beam sections, and installing the side mold in place;

s3, hoisting the steel reinforcement framework, and installing the inner mold in blocks;

s4, pouring and maintaining concrete;

and S5, after the maintenance is finished, moving the newly-poured beam section to a beam storage field, moving the right-end matched rectangular beam section to the left end, adding the next section of matched rectangular beam section to the right end, and repeating the processes until all the middle beam sections are manufactured.

The invention at least comprises the following beneficial effects:

1) the traditional stub matching method needs to use a fixed end die and a matching beam section as end dies at two ends to prefabricate the rest beam sections except for a first section beam section, only half of the middle beam section is similar to the production method of the stub matching method, the remaining half of the rectangular beam section is prefabricated as end dies at two ends through the fixed end die and the movable end die, the used panel of the fixed end die and the panel of the movable end die can both adopt a convex key tooth form, the template production is simpler, and in addition, because the section size of the prefabricated rectangular beam section is basically fixed, the times of accurate positioning of the movable end die are fewer; by combining the advantages, the prefabrication efficiency of the partial beam sections is higher than that of a stub matching method, and the matching beam position adjustment is not needed, so that the overall manufacturing efficiency of the invention is higher than that of the stub matching method.

2) Compared with the traditional stub matching method, the prefabrication method of the middle beam section is improved, a fixed end die is not adopted any more, rectangular beam sections are used as templates at two ends during prefabrication, the rectangular beam section at one end plays a role of fixing the end die, and the rectangular beam section at the other end has the same function as a matched beam in the traditional method, so that the processing and manufacturing of the fixed end die are omitted, and the template cost is saved.

3) Because the middle trapezoidal beam section is prefabricated by taking the rectangular beam section as end molds at two ends, the prefabrication error of the prefabricated rectangular beam section can be corrected through the middle beam section.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic view of the segmentation of the present invention;

FIG. 2 is a schematic diagram of a method for prefabricating the remaining segments in a conventional manner;

FIG. 3 is a schematic diagram of a method for prefabricating a first section of a beam section by a conventional method;

FIG. 4 is a schematic illustration of a method of prefabricating a rectangular beam section according to the present invention;

fig. 5 is a schematic view illustrating a method of prefabricating the intermediate beam section according to the present invention.

Description of reference numerals:

1. rectangular beam section, 2, middle beam section, 3, fixed end mould, 4, movable end mould, 5, side mould, 6, die block, 7, convex key tooth, 8, screw rod, 9 and matching beam section.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Examples

The method for dividing the sections of the section box girder comprises the following steps:

1) segment division mode (as shown in figure 1)

The number 4# rectangular beam section 1, the number 3# middle beam section 2, the number 2# rectangular beam section 1, the number 1# middle beam section 2, the number 0 rectangular beam section 1, the number 1# middle beam section 2, the number 2# rectangular beam section 1, the number 3# middle beam section 2 and the number 4# rectangular beam section 1 are arranged in sequence from left to right in the figure 1, and the arc line in the middle of the center is the center line of the section box beam.

The method improves the dividing mode and the prefabrication sequence of box girder sections in the same prefabrication sequence in the traditional stub matching method, firstly, in all the girder sections divided by one prefabrication sequence, prefabricating a plurality of rectangular girder sections 1 with the same length as that of the first section, then using adjacent rectangular girder sections 1 as end molds to manufacture other intermediate girder sections 2, namely arranging one intermediate girder section 2 between every two adjacent rectangular girder sections 1, when the bridge is longitudinally provided with flat bends, the other girder sections manufactured by using the rectangular girder sections 1 as the end molds are trapezoidal intermediate girder sections 2, and each trapezoidal intermediate girder section 2 is prefabricated by using the rectangular girder sections 1 at two sides as the end molds.

2) Segment box girder prefabrication sequence

The prefabrication sequence firstly needs to prefabricate all rectangular beam sections 1 through the fixed end mould 3 and the movable end mould 4, the used panel of the fixed end mould 3 and the panel of the movable end mould 4 can both adopt a convex key tooth 7 form, the template manufacture is simpler, the section size of the rectangular beam section 1 is basically fixed, only the difference of the prestressed hole positions exists, the prefabrication method is shown in figure 4 and is consistent with the traditional method for prefabricating the first section beam section shown in figure 3, and the concrete prefabrication steps are as follows:

s1, installing and checking the fixed end die 3;

s2, positioning and locking the movable end die 4;

s3, hoisting a reinforcement cage, tensioning a top screw 8, and installing a side die 5 and a bottom die 6;

s4, pouring and maintaining concrete;

and S5, demolding the movable end mold 4 after the maintenance is finished, setting the movable end mold 4 at the same position to perform prefabrication of the next rectangular beam section 1 after the rectangular beam section 1 is lifted to a modification area, and repositioning the movable end mold 4 is not needed.

After the rectangular beam sections 1 are prefabricated, the positions of all the rectangular beam sections 1 are determined in a mode that one rectangular beam section 1 is arranged at intervals in all the beam sections divided by one span beam, and the positions of the rest trapezoidal middle beam sections 2 are determined according to the positions.

Then, the adjacent rectangular beam sections 1 are used as end molds at two ends, and the middle beam section 2 is prefabricated, the method is similar to a stub matching method, as shown in fig. 2, wherein one rectangular beam section 1 plays a role of fixing an end mold 3 in the stub matching method, the other rectangular beam section 1 plays a role of matching a beam section 9, the manufacturing method is shown in fig. 5, and the specific manufacturing steps are as follows:

s1, installing the bottom die 6 in place;

s2, positioning the matched beam section 9, and installing the side mold 5 in place;

s3, hoisting the steel reinforcement framework, and installing the inner mold in blocks;

s4, pouring and maintaining concrete;

and S5, after maintenance is completed, moving the newly-poured beam section to a beam storage field, moving the right-end matched rectangular beam section to the left end through a bottom die 6 trolley, adding the next section of matched rectangular beam section 1 to the right end, and repeating the processes.

The conventional stub method is illustrated in fig. 2. Compared with the method of the present invention, the conventional stub method requires installation and verification of the fixed end die 3 before the step of S1; in the step S5, after the concrete pouring is completed, the matched beam section 9 is moved to a beam storage yard, a newly poured beam section is moved to the original matched beam position as a matched beam of the next prefabricated section, and the process is repeated, but the fixed end mold 3 is required to be installed in the conventional method. Compared with the traditional stub matching method, the improved stub matching method omits the fixed end die 3, and can save the model cost of the end die.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (8)

1. A method for quickly prefabricating a concrete segment box girder is characterized by comprising the following two steps:

the method comprises the following steps: dividing box girder segments in the same prefabrication sequence, and dividing the box girder segments in the same prefabrication sequence into two girder segments, wherein the two girder segments comprise N rectangular girder segments and N-1 middle girder segments;

step two: prefabricating the segmental box girder, namely prefabricating rectangular girder segments, pouring a middle girder segment between any two adjacent rectangular girder segments, and prefabricating all box girder segments in a sequence.

2. A method for quickly prefabricating a concrete segment box girder according to claim 1, wherein in the first step, the rectangular girder segment is prefabricated in the same way as the first-segment girder segment.

3. A method for rapid prefabrication of a concrete section box girder according to claim 2, wherein when the bridge is provided with a flat bend in the longitudinal direction, the intermediate girder section is in the form of a trapezoidal girder section.

4. The method for rapidly prefabricating the concrete section box girder according to claim 1, wherein in the second step, any two rectangular girder sections are used as end molds to pour the middle girder section in the middle.

5. A method for rapidly prefabricating a concrete section box girder according to claim 1, wherein the rectangular girder section is prefabricated using a fixed end form and a movable end form as end forms of both ends.

6. A method of rapid prefabrication of a concrete section box beam according to claim 5, wherein the fixed end form and the movable end form are both in the form of splined teeth.

7. A method for quickly prefabricating the concrete section box girder according to claim 5, wherein the concrete prefabrication method of the rectangular girder section is as follows:

s1, mounting and checking a fixed end die;

s2, positioning and locking the movable end die;

s3, hoisting a reinforcement cage, tensioning a top screw, and installing a side die and a bottom die;

s4, pouring and maintaining concrete;

and S5, demolding the movable end mold after maintenance is finished, arranging the movable end mold at the same position after the rectangular beam section is lifted to the modification area to perform prefabrication of the next rectangular beam section, and not needing to reposition the movable end mold.

8. A method for rapidly prefabricating a concrete section box girder according to claim 1, wherein the concrete method for manufacturing the intermediate girder section is as follows:

s1, installing a bottom die in place;

s2, positioning the rectangular beam sections on the two sides as matching beam sections, and installing the side mold in place;

s3, hoisting the steel reinforcement framework, and installing the inner mold in blocks;

s4, pouring and maintaining concrete;

and S5, after the maintenance is finished, moving the newly-poured beam section to a beam storage field, moving the right-end matched rectangular beam section to the left end, adding the next section of matched rectangular beam section to the right end, and repeating the processes until all the middle beam sections are manufactured.

Images