Anti-cracking structure and construction method of single-box double-chamber prefabricated segmental box girder during construction

Abstract

The present invention relates to a single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction and a construction method thereof. The single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction includes: an installation beam body and a stress traction member, the installation beam body includes a bridge deck beam, the bridge deck beam is used to splice to form a bridge deck of the bridge body, a bridge box body is provided on one side of the bridge deck beam, the bridge box body is provided with more than two assembly chambers, a middle web is provided between two adjacent assembly chambers, and the sides of two adjacent assembly chambers away from the middle web are respectively a first side web and a second side web, one end of the stress traction member is fixedly matched with the first side web, the other end of the stress traction member passes through the middle web and is fixedly matched with the second side web, the stress traction member is tightened with a preset stress in the bridge box body, and the stress traction member forms a V-shaped structure in the bridge box body.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a single-box double-chamber prefabricated segment box girder construction period anti-cracking structure and a construction method thereof. Background Art

[0002] Most bridges are constructed using prestressed concrete, which means that they need to be cast on site, consuming a lot of manpower and material costs. Therefore, prefabricated segmental bridges appeared when building bridges, that is, the bridge beams are divided into segments according to the length of the bridge, and assembled after prefabrication in factories or workshops. However, the current traditional segmental beams have a large deadweight and the segmental beams mostly adopt a single-box multi-chamber structure (that is, there is a large hollow area in the middle of the beam), which makes it easy for the segmental beams to cause cross-sectional cracking during transportation, lifting or storage. Summary of the invention

[0003] Based on this, it is necessary to provide a single-box double-chamber prefabricated segmental box girder construction period anti-cracking structure and a single-box double-chamber prefabricated segmental box girder construction period anti-cracking structure and a construction method thereof in order to address the problem that segmental beams are prone to cross-section cracking.

[0004] A single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction. The single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction includes: an installation beam body and a stress traction member, the installation beam body includes a bridge deck beam, the bridge deck beam is used to splice to form the bridge deck of the bridge body, a bridge box body is provided on one side of the bridge deck beam, the bridge box body is provided with more than two assembly chambers, a middle web is provided between two adjacent assembly chambers, and the sides of two adjacent assembly chambers away from the middle web are respectively a first side web and a second side web, one end of the stress traction member is fixedly matched with the first side web, the other end of the stress traction member passes through the middle web and is fixedly matched with the second side web, the stress traction member is tightened with a preset stress in the bridge box body, and the stress traction member forms a V-shaped structure in the bridge box body.

[0005] A construction method for a single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction, comprising the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction, and also comprising the following steps: pre-embedding the first anchor fixing part, the second anchor fixing part and the third anchor fixing part on the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction; pouring precast concrete on the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction; installing the stress traction part on the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction with a preset stress; hoisting and storing the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction; hoisting the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction to a preset bridge position for installation and construction; and removing the stress traction part.

[0006] In one embodiment, the segmented box girder mechanism also includes a first anchor fixing, a second anchor fixing, a third anchor fixing, a first auxiliary connecting member and a second auxiliary connecting member, the first anchor fixing member is installed at the first side web, the second anchor fixing member is installed at the second side web, and the third anchor fixing member is installed at the bottom of the middle web, one end of the stress pulling member is connected to the first anchor fixing member through the first auxiliary connecting member, and the other end of the stress pulling member passes through the third anchor fixing member and is connected to the second anchor fixing member through the second auxiliary connecting member.

[0007] 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 one end of the first side web facing the bridge deck beam, the first side web 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.

[0008] In one embodiment, the first adapter includes a first spiral steel bar, 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 steel bar is sleeved on the first connecting seat.

[0009] In one embodiment, the second auxiliary connecting member includes a second connecting sleeve and a second adapter, the second anchor fixing member is installed at one end of the second side web facing the bridge deck beam, a second mounting hole is opened on the second side web, the second connecting sleeve is installed in the second mounting hole, and the second connecting sleeve is fixedly matched with the second anchor fixing member through the second adapter.

[0010] In one embodiment, the first adapter includes a second spiral steel bar, 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 steel bar is sleeved on the second connecting seat.

[0011] In one embodiment, the third anchor fixing member includes a third connecting sleeve and a reinforcement rib, a third mounting hole is provided at the bottom of the middle web, the third connecting sleeve is sleeved on the middle web, the reinforcement rib is sleeved on the outside of the third connecting sleeve, and the stress pulling member passes through the third connecting sleeve.

[0012] In one of the embodiments, in the step of installing the stress pulling component with preset stress on the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction: removing the first anchor fixing component and pouring the anchor sealing material on the corresponding demolition position of the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction; and removing the second anchor fixing component and pouring the anchor sealing material on the corresponding demolition position of the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction.

[0013] In one of the embodiments, during the step of hoisting the single-box double-chamber prefabricated segmental box girder construction period anti-cracking structure to a preset bridge position for installation and construction, the stress of the stress traction member is adjusted.

[0014] When the above-mentioned single-box double-chamber prefabricated segmental box girder anti-cracking structure is transported during construction, the installation beam body can first be prefabricated in a workshop or factory. At this time, the installed beam body after processing includes a bridge deck beam and a bridge box body installed on the bridge deck beam. The number of bridge boxes locked on an installation beam body and the number of assembly chambers opened in the bridge box body are determined according to the actual installation situation. For example: when the installation beam body adopts a one-box two-chamber structure (that is, a bridge box beam is provided on an installation beam body, and two assembly chambers are opened in the bridge box beam), after the installation beam body is processed, one end of the stress traction member is fixedly matched with the first side web, and the other end of the stress traction member passes through the middle web and is fixedly matched with the second side web. The stress traction member is adjusted to achieve the preset stress, and the stress traction member forms a V-shaped structure in the bridge box body. The anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction is equipped with stress traction parts, so that the force on the web in the installed beam body can be transferred to the first side web and the second side web through the stress traction parts, thereby avoiding cracking of the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction during the processes of hoisting, beam storage, and installation.

[0015] When the construction method of the above-mentioned single-box double-chamber prefabricated segmental box girder anti-cracking structure is used, firstly, the installation positions of the first anchor fixture and the second anchor fixture are determined according to the length of the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction and the positions of the first side web and the second side web, and the third anchor fixture is installed at the bottom of the middle web. Then, precast concrete is poured into the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction to improve the self-strength of the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction. For example: when the pouring strength of precast concrete in the anti-cracking structure of the single-box double-chamber precast segmental box girder during construction reaches more than 75%, the stress traction parts can be installed on the anti-cracking structure of the single-box double-chamber precast segmental box girder during construction, and the stress of the stress traction parts on the anti-cracking structure of the single-box double-chamber precast segmental box girder during construction is adjusted to ensure that the force on the middle web can be transferred to the first side web and the second side web through the stress traction parts, and the anti-cracking structure of the single-box double-chamber precast segmental box girder during construction is hoisted and stored according to the construction needs. After the anti-cracking structure of the single-box double-chamber precast segmental box girder during construction is completed, the stress traction parts will be removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall structural diagram of the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction;

[0017] Figure 2 for Figure 1 A partial enlarged view of part A shown;

[0018] Figure 3 for Figure 1 A partial enlarged view of portion B shown;

[0019] Figure 4 The flowchart is a construction method of a crack prevention structure for a single-box double-chamber prefabricated segmental box girder during the construction period.

[0020] 100. Install the beam body, 110. Bridge deck beam, 120. Bridge box, 121. Assembly room, 122. Middle web, 123. First side web, 124. Second side web, 200. Stress pulling member, 300. First anchor fixing member, 400. Second anchor fixing member, 500. Third anchor fixing member, 510. Third connecting sleeve, 520. Reinforcement ribs, 600. First auxiliary connecting member, 610. First connecting sleeve, 620. First adapter, 621. First spiral reinforcement, 622. First connecting seat, 623. First fixing member, 700. Second auxiliary connecting member, 710. Second connecting sleeve, 720. Second adapter. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0027] Combination Figures 1 to 3 As shown, in one embodiment, the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction includes: an installation beam body 100 and a stress traction member 200, the installation beam body 100 includes a bridge deck beam 110, the bridge deck beam 110 is used to splice to form a bridge deck of the bridge body, a bridge box body 120 is provided on one side of the bridge deck beam 110, and more than two assembly chambers 121 are provided on the bridge box body 120, and a middle web plate 122 is provided between two adjacent assembly chambers 121, and two adjacent The side of the assembly chamber 121 away from the middle web 122 includes a first side web 123 and a second side web 124, one end of the stress pulling member 200 is fixedly matched with the first side web 123, and the other end of the stress pulling member 200 passes through the middle web 122 and is fixedly matched with the second side web 124. The stress pulling member 200 is tightened with a preset stress in the bridge box 120, and the stress pulling member 200 forms a V-shaped structure in the bridge box 120.

[0028] When the above-mentioned single-box double-chamber prefabricated segmental box girder anti-cracking structure is transported, the installation beam body 100 can first be prefabricated in a workshop or factory. At this time, the processed installation beam body 100 includes a bridge deck beam 110 and a bridge box body 120 installed on the bridge deck beam 110. The number of bridge boxes 120 locked and set on one installation beam body 100 and the number of assembly chambers 121 in the bridge box body 120 are determined according to the actual installation situation. For example, when the installation beam 100 adopts a one-box two-chamber structure (i.e., a bridge box beam is provided on one installation beam 100, and two assembly chambers 121 are provided in the bridge box beam), after the installation beam 100 is processed, one end of the stress traction member 200 is fixedly matched with the first side web 123, and the other end of the stress traction member 200 passes through the middle web 122 and is fixedly matched with the second side web 124, and the stress traction member 200 is adjusted to reach the preset stress, and at the same time, the stress traction member 200 forms a V-shaped structure in the bridge box 120. The anti-cracking structure during the construction period of the single-box double-chamber prefabricated segmental box beam is provided with a stress traction member 200, so that the force on the middle web 122 of the installation beam 100 can be transferred to the first side web 123 and the second side web 124 through the stress traction member 200, thereby preventing the anti-cracking structure during the construction period of the single-box double-chamber prefabricated segmental box beam from cracking during the hoisting, beam storage, installation, etc.

[0029] Combination Figures 1 to 3As shown, in one embodiment, the segmented box girder mechanism further includes a first anchor fixture 300, a second anchor fixture 400, a third anchor fixture 500, a first auxiliary connector 600 and a second auxiliary connector 700, wherein the first anchor fixture 300 is installed at the first side web 123, the second anchor fixture 400 is installed at the second side web 124, and the third anchor fixture 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 fixture 300 through the first auxiliary connector 600, and the other end of the stress traction member 200 is connected to the second anchor fixture 400 through the third anchor fixture 500 and the second auxiliary connector 700. Specifically, the stress traction member 200 is a steel strand or a steel wire rope. The first anchor fixture 300 and the second anchor fixture 400 can be anchor boxes or anchor hooks. The third anchor fixture 500 can be an anchor box or an anchor pipe. The first auxiliary connector 600 and the second auxiliary connector 700 are connecting sleeves or connecting seats. At this time, the first auxiliary connector 600 can make the connection between the stress traction member 200 and the first anchor fixture 300 more convenient, and the second auxiliary connector 700 can make the connection between the stress traction member 200 and the second anchor fixture 400 more convenient. Further, the third anchor fixture 500 is installed at the bottom of the middle web 122. At this time, in the longitudinal section of the installation beam body 100, the heights of the first anchor fixture 300 and the second anchor fixture 400 are both higher than the third anchor fixture 500, so that after the stress traction member 200 is installed on the installation beam body 100, the stress traction member 200 can form a V-shaped structure.

[0030] Combination Figure 1 and Figure 2As shown, in one embodiment, specifically, the first auxiliary connecting member 600 includes a first connecting sleeve 610 and a first adapter 620, the first anchor fixing member 300 is installed at one end of the first side web 123 facing the bridge deck beam 110, the first side web 123 is provided with a first mounting hole, the first connecting sleeve 610 is installed in the first mounting hole, and the first connecting sleeve 610 is fixedly matched with the first anchor fixing member 300 through the first adapter 620. The first adapter 620 is an adapter seat or an adapter tube. When the first adapter 620 is fixed to the first anchor fixing member 300, a screw or a protrusion can be added to the first adapter 620, a threaded hole matched with the screw thread can be added to the first anchor fixing member 300, or a protrusion corresponding to the protrusion can be added to the first anchor fixing member 300. The above-mentioned embodiment can effectively improve the connection and fixing effect of the first adapter 620 and the first anchor fixing member 300. Furthermore, by providing the first mounting hole on the first side web 123, the fixing effect of the first connecting 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 in conflict with the hole wall of the first mounting hole, thereby ensuring the installation effect of the first connecting sleeve 610 in the first mounting hole. In addition, when the first connecting sleeve 610 is installed in the first mounting hole, a reinforcing rib 520 can be added to the first connecting sleeve 610 to improve the self strength of the first connecting sleeve 610.

[0031] Combination Figure 1 and Figure 2 As shown, in one embodiment, the first adapter 620 includes a first spiral steel bar 621, a first connecting seat 622 and a first fixing member 623, the first connecting seat 622 is connected to the first anchor fixing member 300 through the first fixing member 623, the other end of the first connecting seat 622 is connected to the first connecting sleeve 610, and the first spiral steel bar 621 is sleeved on the first connecting seat 622. Specifically, the first fixing member 623 can be a screw or a hook. Corresponding threaded holes or slots can be provided on the first anchor fixing member 300 to ensure the fixing effect of the first fixing member 623 and the first anchor fixing member 300. Furthermore, adding the first spiral steel bar 621 to the first connecting seat 622 can effectively improve the self-strength of the first connecting seat 622, and avoid the first connecting seat 622 from breaking or cracking when in use.

[0032] Combination Figure 1As shown, 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 installed at one end of the second side web 124 facing the bridge deck beam 110, the second side web 124 is provided with a second mounting hole, the second connecting sleeve 710 is installed in the second mounting hole, and the second connecting sleeve 710 is fixedly matched with the second anchor fixing member 400 through the second adapter 720. Specifically, the second adapter 720 is an adapter seat or an adapter tube. When the second adapter 720 is fixed to the first anchor fixing member 300, a screw or a protrusion can be added to the second adapter 720, a threaded hole that is matched with the screw thread can be added to the second anchor fixing member 400, or a protrusion that is opposite to the protrusion can be added to the second anchor fixing member 400. The above-mentioned embodiment can effectively improve the connection and fixing effect of the second adapter 720 and the second anchor fixing member 400. Furthermore, by providing the second mounting hole on the second side web 124, the fixing effect of the second connecting 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 in conflict with the hole wall of the second mounting hole, thereby ensuring the installation effect of the second connecting sleeve 710 in the second mounting hole. In addition, when the second connecting sleeve 710 is installed in the second mounting hole, a reinforcing rib 520 can be added to the second connecting sleeve 710 to improve the self strength of the second connecting sleeve 710.

[0033] In one embodiment, the first adapter 620 includes a second spiral steel bar, a second connecting seat and a second fixing member, the second connecting seat is connected to the second anchor fixing member 400 through the second fixing member, the other end of the second connecting seat is connected to the second connecting sleeve 710, and the second spiral steel bar is sleeved on the second connecting seat. Specifically, the second fixing member can be a screw or a hook. Corresponding threaded holes or slots can be opened on the second anchor fixing member 400 to ensure the fixing effect of the second fixing member and the second anchor fixing member 400. Furthermore, adding a second spiral steel bar to the second connecting seat can effectively improve the self-strength of the second connecting seat and avoid the second connecting seat from breaking or cracking when in use.

[0034] Combination Figures 1 to 3As shown, in one embodiment, the third anchor fixture 500 includes a third connecting sleeve 510 and a reinforcing rib 520, a third mounting hole is provided at the bottom of the middle web 122, the third connecting sleeve 510 is sleeved on the middle web 122, the reinforcing rib 520 is sleeved outside the third connecting sleeve 510, and the stress traction member 200 passes through the third connecting sleeve 510. Specifically, the angle of the V-shaped structure of the stress traction member 200 on the installation beam body 100 can be determined by determining the opening height of the third mounting hole on the middle web 122. The angle change of the V-shaped structure can achieve more effective stress support for the installation beam body 100. Further, when the third mounting hole is opened, the cavity of the third mounting hole can be an arc cavity. At this time, when the stress traction member 200 penetrates into or out of the third mounting hole, the friction between the stress traction member 200 and the third mounting hole at the corner (or corner) can be effectively reduced. At the same time, after the third connecting sleeve 510 is sleeved in the third mounting hole, the side wall of the third connecting sleeve 510 conflicts with the hole wall of the third mounting hole, thereby ensuring the installation effect of the third connecting sleeve 510 in the third mounting hole.

[0035] Combination Figure 4 As shown, in one embodiment, a construction method of a single-box double-chamber prefabricated segmental box girder construction period anti-cracking structure includes a single-box double-chamber prefabricated segmental box girder construction period anti-cracking structure, and also includes the following steps:

[0036] S100, pre-embedding the first anchor fixture 300, the second anchor fixture 400 and the third anchor fixture 500 on the anti-cracking structure during the construction period of the single-box double-chamber prefabricated segmental box girder;

[0037] S200, pouring precast concrete into the anti-cracking structure during construction of the single-box double-chamber precast segmental box girder;

[0038] S300, installing the stress pulling member 200 on the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction with a preset stress;

[0039] S400, hoisting and storing the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during the construction period;

[0040] S500, hoisting the single-box double-chamber prefabricated segmental box girder construction period anti-cracking structure to a preset bridge position for installation and construction;

[0041] S600, removing the stress pulling member 200.

[0042] When the construction method of the single-box double-chamber prefabricated segmental box girder anti-cracking structure is used, firstly, the installation positions of the first anchor fixture 300 and the second anchor fixture 400 are determined according to the length of the single-box double-chamber prefabricated segmental box girder anti-cracking structure and the positions of the first side web and the second side web, and the third anchor fixture 500 is installed at the bottom of the middle web 122. Then, precast concrete is poured into the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction to improve the self-strength of the single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction. For example: when the pouring strength of precast concrete in the anti-cracking structure during the construction period of the single-box double-chamber precast segmental box girder reaches more than 75%, the stress traction member 200 can be installed on the anti-cracking structure during the construction period of the single-box double-chamber precast segmental box girder, and the stress of the stress traction member 200 on the anti-cracking structure during the construction period of the single-box double-chamber precast segmental box girder is adjusted to ensure that the force on the middle web 122 can be transferred to the first side web 123 and the second side web 124 through the stress traction member 200, and the anti-cracking structure during the construction period of the single-box double-chamber precast segmental box girder is hoisted and stored according to the construction needs. After the anti-cracking structure during the construction period of the single-box double-chamber precast segmental box girder is completed, the stress traction member 200 is removed.

[0043] Combination Figure 4 As shown, in one embodiment, the first anchor fixture 300 is removed and the anchor sealing material is poured on the corresponding removal position of the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction, and the second anchor fixture 400 is removed and the anchor sealing material is poured on the corresponding removal position of the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction. Specifically, the above steps connect and fix the stress traction member 200 by replacing the first anchor fixture 300 with the anchor sealing material, that is, the flatness of the bridge deck beam 110 on the installed beam body 100 is ensured.

[0044] Combination Figure 4 As shown, in one embodiment, the stress of the stress traction member 200 is adjusted. Specifically, according to different construction requirements, the force borne by the segmental box girder mechanism during movement will change. Therefore, in order to ensure that the stress traction member 200 can effectively fix the segmental box girder mechanism under different working conditions, the stress of the stress traction member 200 can be tensioned and adjusted according to the actual stress condition of the segmental box girder.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction, characterized in that: The anti-cracking structure during the construction period of the single-box double-chamber prefabricated segmental box girder includes: an installation beam body and a stress pulling member, the installation beam body includes a bridge deck beam, the bridge deck beam is used to splice to form the bridge deck of the bridge body, a bridge box body is provided on one side of the bridge deck beam, and more than two assembly chambers are provided on the bridge box body, a middle web is provided between two adjacent assembly chambers, and the sides of two adjacent assembly chambers away from the middle web are respectively a first side web and a second side web, one end of the stress pulling member is fixedly matched with the first side web, the other end of the stress pulling member passes through the middle web and is fixedly matched with the second side web, the stress pulling member is tightened with a preset stress in the bridge box body, and the stress pulling member forms a V-shaped structure in the bridge box body; The single-box double-chamber prefabricated segment box girder construction period anti-cracking structure also includes a first anchor fixing, a second anchor fixing, a third anchor fixing, a first auxiliary connecting member and a second auxiliary connecting member. The first anchor fixing member is installed at the first side web, the second anchor fixing member is installed at the second side web, and the third anchor fixing member is installed at the bottom of the middle web. One end of the stress pulling member is connected to the first anchor fixing member through the first auxiliary connecting member, and the other end of the stress pulling member passes through the third anchor fixing member and is connected to the second anchor fixing member through the second auxiliary connecting member; the third anchor fixing member includes a third connecting sleeve and a reinforcement rib. A third mounting hole is provided at the bottom of the middle web, and the hole cavity of the third mounting hole is an arc-shaped cavity. The third connecting sleeve is sleeved on the middle web, and the reinforcement rib is sleeved on the outside of the third connecting sleeve, and the stress pulling member passes through the third connecting sleeve.

2. The single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction according to claim 1 is characterized in that: The first auxiliary connecting member includes a first connecting sleeve and a first adapter. The first anchor fixing member is installed at one end of the first side web facing the bridge deck beam. A first mounting hole is opened on the first side web. The first connecting sleeve is installed in the first mounting hole. The first connecting sleeve is fixedly matched with the first anchor fixing member through the first adapter.

3. The anti-cracking structure during construction of a single-box double-chamber prefabricated segmental box girder according to claim 2 is characterized in that: The first adapter includes a first spiral steel bar, 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. The first spiral steel bar is sleeved on the first connecting seat.

4. The single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction according to claim 1 is characterized in that: The second auxiliary connecting member includes a second connecting sleeve and a second adapter. The second anchor fixing member is installed at one end of the second side web facing the bridge deck beam. A second mounting hole is opened on the second side web. The second connecting sleeve is installed in the second mounting hole. The second connecting sleeve is fixedly matched with the second anchor fixing member through the second adapter.

5. The single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction according to claim 4 is characterized in that: The second adapter includes a second spiral steel bar, 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. The second spiral steel bar is sleeved on the second connecting seat.

6. A construction method for a single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction, characterized in that: The single-box double-chamber prefabricated segmental box girder anti-cracking structure during construction period according to any one of claims 2 to 5 further comprises the following steps: Pre-embedding the first anchor fixture, the second anchor fixture and the third anchor fixture on the anti-cracking structure during construction of the single-box double-chamber prefabricated segmental box girder; pouring precast concrete into the anti-cracking structure during construction of the single-box double-chamber precast segmental box girder; The stress pulling member is installed on the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction with a preset stress; Hoisting and storing the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during the construction period; The single-box double-chamber prefabricated segmental box girder construction period anti-cracking structure is hoisted to the preset bridge position for installation and construction; The stress pulling member is removed.

7. The construction method of the single-box double-chamber prefabricated segmental box girder construction period crack prevention structure according to claim 6, characterized in that: In the step of installing the stress traction part with preset stress on the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction: removing the first anchor fixing part and pouring the anchor sealing material on the corresponding demolition part of the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction; and removing the second anchor fixing part and pouring the anchor sealing material on the corresponding demolition part of the anti-cracking structure of the single-box double-chamber prefabricated segmental box girder during construction.

8. The construction method of the single-box double-chamber prefabricated segmental box girder construction period crack prevention structure according to claim 6, characterized in that: In the step of hoisting the single-box double-chamber prefabricated segmental box girder construction period anti-cracking structure to a preset bridge position for installation and construction, the stress of the stress traction member is adjusted.

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