阅读说明：本技术 单箱双室预制节段箱梁施工期防开裂结构及其施工方法 (Anti-cracking structure for single-box double-chamber prefabricated segment box girder in construction period and construction method thereof ) 是由 万志勇 徐德志 梁立农 孙向东 杜磊 官快 黄钦桃 贺科 顾晓宇 于 2021-07-29 设计创作，主要内容包括：本发明涉及一种单箱双室预制节段箱梁施工期防开裂结构单箱双室预制节段箱梁施工期防开裂结构及其施工方法。所述单箱双室预制节段箱梁施工期防开裂结构包括：安装梁体与应力牵引件,所述安装梁体包括桥面梁,所述桥面梁用于拼接形成桥体的桥面,在所述桥面梁的其中一侧设有桥箱体,所述桥箱体上开设有两个以上装配室,在相邻两个所述装配室之间设有中腹板,相邻两个所述装配室远离所述中腹板的一侧分别为第一边腹板与第二边腹板,所述应力牵引件的一端与所述第一边腹板固定配合,所述应力牵引件的另一端穿过所述中腹板并与所述第二边腹板固定配合,所述应力牵引件在所述桥箱体内以预设应力绷紧,且所述应力牵引件在所述桥箱体内形成V形结构。(The invention relates to a single-box double-chamber prefabricated segment box girder construction period anti-cracking structure and a construction method thereof. The structure of preventing ftractureing of single case double-chamber prefabricated segment case roof beam construction period includes: the installation roof beam body draws the piece with stress, the installation roof beam body includes the bridge face roof beam, the bridge face roof beam is used for the concatenation to form the bridge floor of the bridge body one of them one side of bridge face roof beam is equipped with the bridge box, the assembly chamber more than two has been seted up on the bridge box, adjacent two be equipped with well web between the assembly chamber, adjacent two the assembly chamber is kept away from one side of well web is first edge web and second edge web respectively, the stress draw the one end of piece with first edge web fixed fit, the other end that the piece was drawn to stress passes well web and with second edge web fixed fit, the piece is drawn to stress is in tighten with the preset stress in the bridge box, just the piece is drawn to stress form the V-arrangement structure in the bridge box.)

1. The utility model provides a structure of preventing ftractureing during construction of single case double chamber prefabricated segment box girder which characterized in that, the structure of preventing ftractureing during construction of single case double chamber prefabricated segment box girder includes: the installation roof beam body draws the piece with stress, the installation roof beam body includes the bridge face roof beam, the bridge face roof beam is used for the concatenation to form the bridge floor of the bridge body one of them one side of bridge face roof beam is equipped with the bridge box, the assembly chamber more than two has been seted up on the bridge box, adjacent two be equipped with well web between the assembly chamber, adjacent two the assembly chamber is kept away from one side of well web is first edge web and second edge web respectively, the stress draw the one end of piece with first edge web fixed fit, the other end that the piece was drawn to stress passes well web and with second edge web fixed fit, the piece is drawn to stress is in tighten with the preset stress in the bridge box, just the piece is drawn to stress form the V-arrangement structure in the bridge box.

2. The structure of claim 1, further comprising a first anchor fixing member, a second anchor fixing member, and a third anchor fixing member, wherein the first auxiliary connecting member and the second auxiliary connecting member are disposed at the first edge web plate, the second anchor fixing member is disposed at the second edge web plate, the third anchor fixing member is disposed at the bottom of the middle web plate, one end of the stress traction member is connected to the first anchor fixing member through the first auxiliary connecting member, and the other end of the stress traction member passes through the third anchor fixing member and is connected to the second anchor fixing member through the second auxiliary connecting member.

3. The structure of claim 2, wherein the first auxiliary connector comprises a first connection sleeve and a first connector, the first anchor fixing member is mounted at one end of the first edge web plate facing the bridge deck beam, the first edge web plate is provided with a first mounting hole, the first connection sleeve is mounted in the first mounting hole, and the first connection sleeve is fixedly matched with the first anchor fixing member through the first connector.

4. The structure of claim 3, wherein the first connecting member comprises a first spiral reinforcement, a first connecting seat and a first fixing member, the first connecting seat is connected with the first anchor fixing member through the first fixing member, the other end of the first connecting seat is connected with the first connecting sleeve, and the first spiral reinforcement is sleeved on the first connecting seat.

5. The structure of claim 2, wherein the second auxiliary connector comprises a second connecting sleeve and a second adapter, the second anchor fixing member is mounted at one end of the second side web plate facing the bridge deck beam, the second side web plate is provided with a second mounting hole, the second connecting sleeve is mounted in the second mounting hole, and the second connecting sleeve is fixedly matched with the second anchor fixing member through the second adapter.

6. The structure of claim 5, wherein the first connecting member comprises a second spiral reinforcement, a second connecting seat and a second fixing member, the second connecting seat is connected to the second anchor fixing member through the second fixing member, the other end of the second connecting seat is connected to the second connecting sleeve, and the second spiral reinforcement is sleeved on the second connecting seat.

7. The structure of claim 2, wherein the third anchor fixing member comprises a third connecting sleeve and a reinforcing rib, a third mounting hole is formed in the bottom of the middle web plate, the third connecting sleeve is sleeved on the middle web plate, the reinforcing rib is sleeved on the outside of the third connecting sleeve, and the stress traction member penetrates through the third connecting sleeve.

8. A construction method of a single-box double-chamber precast segment box girder construction-period anti-cracking structure is characterized by comprising the single-box double-chamber precast segment box girder construction-period anti-cracking structure as claimed in any one of claims 2 to 7, and further comprising the following steps:

pre-burying the first anchor fixing part, the second anchor fixing part and the third anchor fixing part on the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period;

pouring precast concrete to the anti-cracking structure of the single-box double-chamber precast segmental box girder in the construction period;

the stress traction piece is arranged on the anti-cracking structure of the single-box double-chamber prefabricated segment box girder in the construction period by preset stress;

hoisting and storing the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period;

hoisting the anti-cracking structure of the single-box double-chamber prefabricated segment box girder to a preset bridge position for installation and construction in the construction period;

and removing the stress traction piece.

9. The construction method of the anti-cracking structure of the single-box double-chamber precast segmental box girder in the construction period according to claim 8, wherein the stress traction member is installed on the anti-cracking structure of the single-box double-chamber precast segmental box girder in the construction period with a preset stress in the steps of: and removing the first anchor fixing part, pouring anchor sealing materials on the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period, and removing the second anchor fixing part, and pouring anchor sealing materials on the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period.

10. The construction method of the anti-cracking structure in the construction period of the single-box double-chamber precast segmental box girder according to claim 8, wherein the stress of the stress traction piece is adjusted in the step of hoisting the anti-cracking structure in the construction period of the single-box double-chamber precast segmental box girder to a preset bridge site for installation and construction.

Technical Field

The invention relates to the technical field of bridge construction, in particular to a single-box double-chamber prefabricated section box girder construction period anti-cracking structure and a construction method thereof.

Background

Most of bridges are built by adopting prestressed concrete, namely cast-in-place construction needs to be adopted, and a large amount of labor and material cost is consumed. Therefore, when the bridge is built, a prefabricated segmental bridge appears, namely, a beam body of the bridge is divided into segments according to the length of the bridge and is assembled after being prefabricated in a factory or a workshop. However, the self weight of the conventional sectional beam is large, and the sectional beam mostly adopts a single-box multi-chamber structure (that is, a hollow area with a large area exists in the middle of the beam), so that the sectional beam is prone to cracking in the processes of carrying, hoisting or storing the beam.

Disclosure of Invention

On the basis, the problem that the section of the sectional type beam body is easy to crack is necessarily solved, and the anti-cracking structure for the single-box double-chamber prefabricated sectional type box beam in the construction period and the construction method thereof are provided.

A single-box double-chamber prefabricated segment box girder anti-cracking structure in a construction period. The structure of preventing ftractureing of single case double-chamber prefabricated segment case roof beam construction period includes: the installation roof beam body draws the piece with stress, the installation roof beam body includes the bridge face roof beam, the bridge face roof beam is used for the concatenation to form the bridge floor of the bridge body one of them one side of bridge face roof beam is equipped with the bridge box, the assembly chamber more than two has been seted up on the bridge box, adjacent two be equipped with well web between the assembly chamber, adjacent two the assembly chamber is kept away from one side of well web is first edge web and second edge web respectively, the stress draw the one end of piece with first edge web fixed fit, the other end that the piece was drawn to stress passes well web and with second edge web fixed fit, the piece is drawn to stress is in tighten with the preset stress in the bridge box, just the piece is drawn to stress form the V-arrangement structure in the bridge box.

A construction method of a cracking-proof structure of a single-box double-chamber precast segment box girder in a construction period comprises the cracking-proof structure of the single-box double-chamber precast segment box girder in the construction period, and further comprises the following steps: pre-burying the first anchor fixing part, the second anchor fixing part and the third anchor fixing part on the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period; pouring precast concrete to the anti-cracking structure of the single-box double-chamber precast segmental box girder in the construction period; the stress traction piece is arranged on the anti-cracking structure of the single-box double-chamber prefabricated segment box girder in the construction period by preset stress; hoisting and storing the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period; hoisting the anti-cracking structure of the single-box double-chamber prefabricated segment box girder to a preset bridge position for installation and construction in the construction period; and removing the stress traction piece.

In one embodiment, the sectional box girder mechanism further comprises a first anchor fixing member, a second anchor fixing member, a third anchor fixing member, a first auxiliary connecting member and a second auxiliary connecting member, wherein the first anchor fixing member is arranged at the first side web plate, the second anchor fixing member is arranged at the second side web plate, the third anchor fixing member is arranged at the bottom of the middle web plate, one end of the stress traction member is connected with the first anchor fixing member through the first auxiliary connecting member, and the other end of the stress traction member is connected with the second anchor fixing member through the second auxiliary connecting member.

In one embodiment, the first auxiliary connecting member includes a first connecting sleeve and a first adapter, the first anchor fixing member is installed at an end of the first edge web plate facing the bridge deck beam, the first edge web plate is provided with a first mounting hole, the first connecting sleeve is installed in the first mounting hole, and the first connecting sleeve is fixedly matched with the first anchor fixing member through the first adapter.

In one embodiment, the first connecting member includes a first spiral reinforcement, a first connecting seat and a first fixing member, the first connecting seat is connected to the first anchor fixing member through the first fixing member, the other end of the first connecting seat is connected to the first connecting sleeve, and the first spiral reinforcement is sleeved on the first connecting seat.

In one embodiment, the second auxiliary connecting member includes a second connecting sleeve and a second adapter, the second anchor fixing member is mounted at an end of the second edge web facing the bridge deck beam, the second edge web is provided with a second mounting hole, the second connecting sleeve is mounted in the second mounting hole, and the second connecting sleeve is fixedly matched with the second anchor fixing member through the second adapter.

In one embodiment, the first connecting part comprises a second spiral steel bar, a second connecting seat and a second fixing part, the second connecting seat is connected with the second anchor fixing part through the second fixing part, the other end of the second connecting seat is connected with the second connecting sleeve, and the second spiral steel bar is sleeved on the second connecting seat.

In one embodiment, the third anchor fixing member includes a third connecting sleeve and a reinforcing rib, a third mounting hole is formed in the bottom of the middle web, the third connecting sleeve is sleeved on the middle web, the reinforcing rib is sleeved outside the third connecting sleeve, and the stress traction member penetrates through the third connecting sleeve.

In one embodiment, the step of installing the stress tractors on the anti-cracking structure of the single-box double-chamber precast segment box girder during construction with preset stress comprises the following steps: and removing the first anchor fixing part, pouring anchor sealing materials on the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period, and removing the second anchor fixing part, and pouring anchor sealing materials on the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period.

In one embodiment, in the step of hoisting the anti-cracking structure of the single-box double-chamber prefabricated segment box girder in the construction period to a preset bridge site for installation and construction, the stress of the stress traction piece is adjusted.

Above-mentioned single case double-chamber precast segment case roof beam construction period prevents that fracture structure when transporting, at first can carry out prefabricated processing to the installation roof beam body in the workshop or mill, and the installation roof beam body after processing is accomplished this moment includes the bridge face roof beam and installs the bridge box body on the bridge face roof beam. And determining the number of the bridge box bodies locked on one mounting beam body and the number of the assembly chambers in the bridge box bodies according to the actual mounting condition. For example: when the mounting beam body adopts a structure with one box and two chambers (namely, one mounting beam body is provided with one bridge box beam, and two assembly chambers are arranged in the bridge box beam), after the mounting beam body is processed, one end of the stress traction piece is fixedly matched with the first edge web plate, the other end of the stress traction piece penetrates through the middle web plate and is fixedly matched with the second edge web plate, the stress traction piece is adjusted to achieve the preset stress, and meanwhile, the stress traction piece forms a V-shaped structure in the bridge box body. The anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period is provided with the stress traction piece through the additional structure, so that the stress on the web plate in the installed girder body can be transferred to the first side web plate and the second side web plate through the stress traction piece, and the cracking phenomenon of the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period in the processes of hoisting, storing and installing can be avoided.

When the construction method of the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period is used, firstly, the installation positions of the first anchorage fixing piece and the second anchorage fixing piece are determined according to the length of the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period and the positions of the first side web plate and the second side web plate, and the third anchorage fixing piece is installed at the bottom of the middle web plate. And then, pouring precast concrete to the anti-cracking structure of the single-box double-chamber precast segmental box girder in the construction period so as to improve the self strength of the anti-cracking structure of the single-box double-chamber precast segmental box girder in the construction period. For example: when the casting strength of the precast concrete in the anti-cracking structure in the construction period of the single-box double-chamber precast segmental box girder reaches over 75 percent, the stress traction piece can be arranged on the anti-cracking structure in the construction period of the single-box double-chamber precast segmental box girder, the stress on the anti-cracking structure in the construction period of the single-box double-chamber precast segmental box girder is adjusted simultaneously, the stress on the middle web plate is transferred to the first web plate and the second web plate through the stress traction piece, and the anti-cracking structure is hoisted and stored in the construction period of the single-box double-chamber precast segmental box girder according to the building requirement. And after the anti-cracking structure is built in the construction period of the single-box double-chamber prefabricated section box girder, the stress traction piece is dismantled.

Drawings

FIG. 1 is a schematic view of the overall structure of a crack prevention structure of a single-box double-chamber prefabricated segment box girder in the construction period;

FIG. 2 is an enlarged view of a portion A shown in FIG. 1;

FIG. 3 is a partial enlarged view of portion B shown in FIG. 1;

FIG. 4 is a flow chart of a construction method of a crack prevention structure during construction of a single-box double-chamber prefabricated segment box girder.

100. The installation beam body, 110, a bridge deck beam, 120, a bridge box body, 121, an assembly chamber, 122, a middle web plate, 123, a first side web plate, 124, a second side web plate, 200, a stress traction piece, 300, a first anchor fixing piece, 400, a second anchor fixing piece, 500, a third anchor fixing piece, 510, a third connecting sleeve, 520, a reinforcing rib, 600, a first auxiliary connecting piece, 610, a first connecting sleeve, 620, a first connecting piece, 621, a first spiral reinforcing steel bar, 622, a first connecting seat, 623, a first fixing piece, 700, a second auxiliary connecting piece, 710, a second connecting sleeve, 720 and a second connecting piece.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 3, in one embodiment, the single-box double-chamber precast segment box girder construction-period crack prevention structure includes: the mounting beam body 100 and the stress traction member 200 are mounted, the mounting beam body 100 includes a bridge deck beam 110, the bridge deck beam 110 is used for splicing to form a bridge deck of the bridge deck, a bridge box body 120 is arranged on one side of the bridge deck beam 110, more than two assembly chambers 121 are arranged on the bridge box body 120, a middle web 122 is arranged between two adjacent assembly chambers 121, one side of each adjacent assembly chamber 121 far away from the middle web 122 is respectively provided with a first side web 123 and a second side web 124, one end of the stress traction member 200 is fixedly matched with the first side web 123, the other end of the stress traction member 200 penetrates through the middle web 122 and is fixedly matched with the second side web 124, the stress traction member 200 is tightened in the bridge box body 120 by preset stress, and the stress traction member 200 forms a V-shaped structure in the bridge box body 120.

When the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period is transported, the mounting girder body 100 can be prefabricated in a workshop or a factory, and the mounting girder body 100 after the prefabricated mounting girder body is machined comprises the bridge deck girder 110 and the bridge box body 120 arranged on the bridge deck girder 110. The number of the bridge boxes 120 locked on one mounting beam body 100 and the number of the assembly chambers 121 in the bridge boxes 120 are determined according to actual mounting conditions. For example: when the installation beam body 100 adopts a structure of one box and two chambers (namely, one installation beam body 100 is provided with one bridge box beam, and two assembly chambers 121 are arranged in the bridge box beam), after the installation beam body 100 is processed, one end of the stress traction piece 200 is fixedly matched with the first side web 123, the other end of the stress traction piece 200 penetrates through the middle web 122 and is fixedly matched with the second side web 124, the stress traction piece 200 is adjusted to achieve preset stress, and meanwhile, the stress traction piece 200 forms a V-shaped structure in the bridge box body 120. The anti-cracking structure of the single-box double-chamber prefabricated section box girder in the construction period is additionally provided with the stress traction piece 200, so that the stress on the web plate 122 in the installation girder body 100 can be transferred to the first side web plate 123 and the second side web plate 124 through the stress traction piece 200, and the cracking phenomenon of the anti-cracking structure of the single-box double-chamber prefabricated section box girder in the processes of hoisting, beam storage, installation and the like can be avoided.

Referring to fig. 1 to 3, in one embodiment, the segmented box girder mechanism further includes a first anchor fixing member 300, a second anchor fixing member 400, a third anchor fixing member 500, a first auxiliary connecting member 600 and a second auxiliary connecting member 700, the first anchor fixing member 300 is installed at the first side web 123, the second anchor fixing member 400 is installed at the second side web 124, the third anchor fixing member 500 is installed at the bottom of the middle web 122, one end of the stress traction member 200 is connected to the first anchor fixing member 300 through the first auxiliary connecting member 600, and the other end of the stress traction member 200 passes through the third anchor fixing member 500 and is connected to the second anchor fixing member 400 through the second auxiliary connecting member 700. Specifically, the stress riser 200 is a steel strand or wire rope. First anchor mount 300 and second anchor mount 400 may be anchor pockets or anchor hooks. Third anchor mount 500 may be an anchor pocket or an anchor tube. The first auxiliary connecting member 600 and the second auxiliary connecting member 700 are connecting sleeves or connecting seats. At this time, the connection of the stress retractor 200 to the first anchor fixture 300 can be facilitated by the first auxiliary connector 600, and the connection of the stress retractor 200 to the second anchor fixture 400 can be facilitated by the second auxiliary connector 700. Further, a third anchor fixing member 500 is installed at the bottom of the middle web 122, and at this time, the heights of the first anchor fixing member 300 and the second anchor fixing member 400 are higher than the third anchor fixing member 500 on the longitudinal section of the installation beam body 100, so that the stress traction member 200 can form a V-shaped structure after the stress traction member 200 is installed on the installation beam body 100.

Referring to fig. 1 and 2, in an embodiment, specifically, the first auxiliary connecting member 600 includes a first connecting sleeve 610 and a first connecting member 620, the first anchor fixing member 300 is installed at an end of the first side web 123 facing the bridge deck beam 110, a first installation hole is opened in the first side web 123, the first connecting sleeve 610 is installed in the first installation hole, and the first connecting sleeve 610 is fixedly engaged with the first anchor fixing member 300 through the first connecting member 620. The first adapter 620 is an adapter or adapter tube. When the first anchor fixing member 300 is fixed to the first adapter 620, a screw or a protrusion may be provided on the first adapter 620, a threaded hole threadedly engaged with the screw may be provided on the first anchor fixing member 300, or a protruding groove opposite to the protrusion may be provided on the first anchor fixing member 300. Such an embodiment may effectively enhance the coupling and securing of first adapter 620 to first anchor mount 300. Further, the first mounting hole is formed in the first side web 123, so that the fixing effect of the first connection sleeve 610 in the first side web 123 can be effectively improved, for example: after the first connecting sleeve 610 is sleeved in the first mounting hole, the side wall of the first connecting sleeve 610 is abutted against the hole wall of the first mounting hole, so that the mounting effect of the first connecting sleeve 610 in the first mounting hole is ensured. In addition, when the first connection sleeve 610 is installed in the first installation hole, a reinforcing rib 520 may be further installed on the first connection sleeve 610 to improve the strength of the first connection sleeve 610.

Referring to fig. 1 and 2, in one embodiment, the first connector 620 includes a first spiral reinforcement 621, a first connector 622 and a first fastener 623, the first connector 622 is connected to the first anchor fastener 300 through the first fastener 623, the other end of the first connector 622 is connected to the first connecting sleeve 610, and the first spiral reinforcement 621 is sleeved on the first connector 622. Specifically, the first fixing member 623 may be a screw or a hook. Corresponding screw holes or locking grooves may be formed in the first anchor fixing member 300, so that the fixing effect of the first fixing member 623 and the first anchor fixing member 300 is ensured. Further, add on first connecting seat 622 and establish first spiral reinforcement 621 and can effectively improve the self intensity of first connecting seat 622, avoid first connecting seat 622 self condition of fracture or fracture when using.

Referring to fig. 1, in one embodiment, the second auxiliary connecting member 700 includes a second connecting sleeve 710 and a second adapter 720, the second anchor fixing member 400 is mounted on an end of the second side web 124 facing the bridge deck beam 110, a second mounting hole is formed in the second side web 124, the second connecting sleeve 710 is mounted in the second mounting hole, and the second connecting sleeve 710 is fixedly engaged with the second anchor fixing member 400 through the second adapter 720. Specifically, the second adaptor 720 is an adaptor or a transfer tube. When the second adaptor 720 is fixed to the first anchor fixing member 300, a screw or a protrusion may be provided on the second adaptor 720, a threaded hole threadedly engaged with the screw may be provided on the second anchor fixing member 400, or a protrusion groove opposite to the protrusion may be provided on the second anchor fixing member 400. Such an embodiment may effectively improve the coupling and fixing effect of the second adaptor 720 and the second anchor fixing member 400. Further, the second mounting hole is formed in the second side web 124, so that the fixing effect of the second connection sleeve 710 in the second side web 124 can be effectively improved, for example: after the second connecting sleeve 710 is sleeved in the second mounting hole, the side wall of the second connecting sleeve 710 is abutted against the hole wall of the second mounting hole, so that the mounting effect of the second connecting sleeve 710 in the second mounting hole is ensured. In addition, when the second connection bushing 710 is installed in the second installation hole, a reinforcing rib 520 may be further installed on the second connection bushing 710 to improve the strength of the second connection bushing 710.

In one embodiment, the first connector 620 includes a second spiral reinforcement, a second connector seat, and a second connector seat, the second connector seat is connected to the second anchor fixing member 400 through the second connector seat, the other end of the second connector seat is connected to the second connection sleeve 710, and the second spiral reinforcement is sleeved on the second connector seat. In particular, the second fixing member may be a screw or a hook. Corresponding screw holes or clamping grooves may be formed in the second anchor fixing member 400, thereby ensuring the fixing effect of the second fixing member and the second anchor fixing member 400. Further, add on the second connecting seat and establish the self intensity that second spiral reinforcement can effectively improve the second connecting seat, avoid the second connecting seat self fracture or the condition of fracture to appear when using.

Referring to fig. 1 to 3, in one embodiment, the third anchor fixing member 500 includes a third connecting sleeve 510 and a reinforcing rib 520, the bottom of the central web 122 is provided with a third mounting hole, the third connecting sleeve 510 is sleeved on the central web 122, the reinforcing rib 520 is sleeved outside the third connecting sleeve 510, and the stress-inducing member 200 passes through the third connecting sleeve 510. Specifically, the included angle of the V-shaped structure of the stress splitter 200 on the mounting beam 100 can be determined by determining the opening height of the third mounting hole on the central web 122. More effective stress support of the installation beam body 100 can be achieved through the angle change of the V-shaped structure. Further, when the third mounting hole is formed, the hole cavity of the third mounting hole may be an arc-shaped cavity, and at this time, when the stress pulling member 200 penetrates into or out of the third mounting hole, friction between the stress pulling member 200 and the third mounting hole at a corner (or corner) may be effectively reduced. Meanwhile, after the third connecting sleeve 510 is sleeved in the third mounting hole, the side wall of the third connecting sleeve 510 is abutted against the hole wall of the third mounting hole, so that the mounting effect of the third connecting sleeve 510 in the third mounting hole is ensured.

Referring to fig. 4, in an embodiment, a construction method of a crack prevention structure during construction of a single-box double-chamber precast segmental box girder includes the crack prevention structure during construction of the single-box double-chamber precast segmental box girder, and further includes the following steps:

s100, pre-burying the first anchor fixing piece 300, the second anchor fixing piece 400 and the third anchor fixing piece 500 on a crack prevention structure in the construction period of the single-box double-chamber prefabricated section box girder;

s200, pouring precast concrete to the anti-cracking structure of the single-box double-chamber precast segmental box girder in the construction period;

s300, installing the stress traction piece 200 on a crack prevention structure of the single-box double-chamber prefabricated segment box girder in the construction period by preset stress;

s400, hoisting and storing the anti-cracking structure of the single-box double-chamber prefabricated segment box girder in the construction period;

s500, hoisting the anti-cracking structure of the single-box double-chamber prefabricated segment box girder in the construction period to a preset bridge position for installation and construction;

s600, disassembling the stress traction piece 200.

When the construction method of the anti-cracking structure in the construction period of the single-box double-chamber prefabricated section box girder is used, firstly, the installation positions of the first anchor fixing piece 300 and the second anchor fixing piece 400 are determined according to the length of the anti-cracking structure in the construction period of the single-box double-chamber prefabricated section box girder and the positions of the first side web plate and the second side web plate, and the third anchor fixing piece 500 is installed at the bottom of the middle web plate 122. And then, pouring precast concrete to the anti-cracking structure of the single-box double-chamber precast segmental box girder in the construction period so as to improve the self strength of the anti-cracking structure of the single-box double-chamber precast segmental box girder in the construction period. For example: when the casting strength of the precast concrete in the anti-cracking structure in the construction period of the single-box double-chamber precast segmental box girder reaches over 75 percent, the stress traction piece 200 can be arranged on the anti-cracking structure in the construction period of the single-box double-chamber precast segmental box girder, and the stress on the anti-cracking structure in the construction period of the single-box double-chamber precast segmental box girder is adjusted by the stress traction piece 200, so that the stress on the middle web plate 122 can be transferred to the first side web plate 123 and the second side web plate 124 through the stress traction piece 200, and the anti-cracking structure can be hoisted and stored in the construction period of the single-box double-chamber precast segmental box girder according to the construction requirement. And after the anti-cracking structure is built in the construction period of the single-box double-chamber prefabricated section box girder, the stress traction piece 200 is dismantled.

Referring to fig. 4, in one embodiment, the first anchor mount 300 is removed and an anchor sealing material is poured on the crack prevention structure corresponding to the removed portion of the single-box dual-chamber precast segment box girder during construction, and the second anchor mount 400 is removed and an anchor sealing material is poured on the crack prevention structure corresponding to the removed portion of the single-box dual-chamber precast segment box girder during construction. Specifically, the stress traction member 200 is connected and fixed by the anchor sealing material instead of the first anchor fixing member 300, that is, the flatness of the bridge deck beam 110 on the installation beam body 100 is ensured.

In one embodiment, the stress of the stress riser 200 is adjusted, as shown in fig. 4. Specifically, according to different building requirements, the acting force born by the sectional box girder mechanism during moving can be changed. Therefore, in order to ensure that the stress traction piece 200 can be effectively fixed to the sectional box girder mechanism under different working conditions, the stress of the stress traction piece 200 can be tensioned and adjusted according to the actual stress condition of the sectional box girder.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.