CN216765538U

CN216765538U - Box girder

Info

Publication number: CN216765538U
Application number: CN202122951194.1U
Authority: CN
Inventors: 潘宁; 李连宝; 苏航
Original assignee: Tengda Construction Group Co Ltd
Current assignee: Tengda Construction Group Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-06-17
Anticipated expiration: 2031-11-29

Abstract

The utility model belongs to the technical field of bridge construction, and discloses a box girder which comprises a bearing seat, a box girder body and a plurality of temperature measuring devices, wherein the bearing seat comprises a base; the box girder body comprises a box girder side plate which is fixedly connected to a bearing surface of the base, the box girder side plate is arranged on the bearing surface in a surrounding mode to form a pouring space, and the box girder side plate is provided with a plurality of mounting through holes along the height direction of the box girder body; the plurality of temperature measuring devices are inserted into the plurality of mounting through holes in a one-to-one correspondence mode, each temperature measuring device comprises a temperature measuring pipe, and the temperature measuring pipes stretch into the pouring space. Through a plurality of temperature measuring devices, at the in-process of carrying out the prefabricated mould, constructor can carry out the observation and the control of real-time temperature variation to each control point according to actual conditions convenient accurately, and this box girder can be at the in-process of carrying out the prefabricated mould, guarantees the stability and the integrality of box girder to carry out convenient accurate control to the change of pouring internal temperature.

Description

Box girder

Technical Field

The utility model relates to the technical field of bridge construction, in particular to a box girder.

Background

The box-section girder bridge has the advantages of light weight, steel saving, large bending and torsional rigidity, quick installation, convenient maintenance, suitability for being made into a continuous girder and concise and attractive appearance. When the span of the bridge is large, the box girder is the best structural form, the torsional rigidity of the closed thin-wall section of the box girder is large, and the box girder is particularly favorable for a curved bridge and a bridge constructed by adopting a cantilever. The top plate and the bottom plate both have larger areas, can effectively resist positive and negative bending moments and meet the reinforcement requirement, and have good dynamic characteristics and small shrinkage deformation values.

The box girder is one of the middle girders in bridge engineering, is hollow inside, has flanges on two sides of the upper part, is similar to a box, and generally consists of a cover plate, a web plate, a bottom plate and a partition plate. Single box, multi-box, etc. The box girder of the reinforced concrete structure is divided into a prefabricated box girder and a cast-in-place box girder. The box girder combined bridge girder erection machine prefabricated in an independent site can be erected after the lower project is completed, the project progress can be accelerated, the construction period can be saved, and the cast-in-place box girder is mainly used for large continuous bridges.

Because of the good overall stress characteristics, box section girder bridges are widely used, wherein post-tensioned prestressed concrete box girder bridges are rapidly developed. The post-tensioning method is a construction method of firstly pouring concrete to form a prefabricated mould, and then tensioning prestressed steel to form a prestressed concrete member after the strength reaches over 75 percent of the design strength. The post-tensioning method adopts two types of concrete, namely bonded prestressed concrete and unbonded prestressed concrete. The former is to cast concrete first, and then stretch the steel bar or the steel bar bundle after the concrete reaches over 75% of the designed strength, and the main stretching procedure is as follows: pipe burying and hole making, concrete pouring, pipe drawing, maintenance and bar penetrating tensioning, anchoring, grouting to prevent steel bars from rusting and anchor head treatment. The force transmission path is to make the concrete obtain pre-stress by means of anchorage to prevent the elastic resilience of reinforcing steel bar, so that the reinforcing steel bar and concrete are integrated into one body, so that it is called prestressed concrete with adhesive. The bonding of prestressed concrete should be reduced because the tensile stress of prestressed reinforcement is reduced by the bonding force, resulting in a reduction in the compressive stress of concrete. The method has simple equipment, does not need a tensioning pedestal, has flexible production and is suitable for the field construction of large-scale components. The main tensioning procedures of the latter are: and (3) coating the prestressed reinforcement with lubricating and anticorrosive materials such as asphalt and the like along the outer surface of the whole length, coating plastic paper or a sleeve, pouring concrete for maintenance, tensioning the reinforcement and anchoring. When in construction, the concrete can be directly poured by putting the reinforcing steel bars into the designed positions as common concrete, and holes for penetrating the reinforcing steel bars and grouting are not required to be reserved, so that the construction procedure is simplified. The effective pre-stress of the unbonded prestressed concrete is increased, the manufacturing cost is reduced, and the method is suitable for the beam body with large span and curved reinforcing bars.

In the process of a post-tensioned prestressed concrete box girder bridge, the prestressed loss is overlarge due to insufficient estimation of the prestressed loss or irregular operation during construction, so that the problems of box girder cracking, overlarge midspan deflection and the like of the bridge are caused, and the change of the internal temperature of a cast body cannot be conveniently and accurately calculated in the process of prefabricating a mold by using the conventional concrete box girder.

Therefore, a box girder is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a box girder which can ensure the stability and integrity of the box girder in the process of prefabricating a mould and conveniently and accurately monitor the change of the internal temperature of a casting body.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a box girder comprises a bearing seat, a box girder body and a plurality of temperature measuring devices, wherein the bearing seat comprises a base; the box girder body comprises a box girder side plate which is fixedly connected to a bearing surface of the base, the box girder side plate surrounds the bearing surface to form a pouring space, and the box girder side plate is provided with a plurality of mounting through holes along the height direction of the box girder body; the plurality of temperature measuring devices are inserted into the plurality of mounting through holes in a one-to-one correspondence mode, each temperature measuring device comprises a temperature measuring pipe, and the temperature measuring pipes stretch into the pouring space.

Optionally, the box girder further includes a supporting device, the supporting device includes supporting rods, and the supporting rods are respectively connected to the base and the outer side surfaces of the box girder side plates.

Optionally, the supporting device further comprises a first connecting mechanism, a second connecting mechanism, a first fixing mechanism and a second fixing mechanism, the first connecting mechanism and the second connecting mechanism are fixedly connected to the two ends of the supporting rod respectively, the first fixing mechanism is fixedly connected to the outer side surface of the box girder side plate, the second fixing mechanism is fixedly connected to the base, the first connecting mechanism is connected to the first fixing mechanism in a clamping manner, and the second connecting mechanism is connected to the second fixing mechanism in a clamping manner.

Optionally, the supporting device further includes an adjusting mechanism, the supporting rod includes a fixed rod portion and a movable rod portion, which are coaxially disposed, the adjusting mechanism is fixedly connected to the fixed rod portion, the movable rod portion is inserted into the fixed rod portion, and the adjusting mechanism can lock the movable rod portion and the fixed rod portion.

Optionally, the first fixing mechanism includes a first connecting portion and a first fastening portion that are fixedly connected to each other, the first connecting portion is fixedly connected to the box girder side plate, the second fixing mechanism includes a second connecting portion and a second fastening portion that are fixedly connected to each other, the second connecting portion is fixedly connected to the base side portion, and is perpendicular to the direction of the outer side surface of the box girder side plate, the first fastening portion is close to the box girder side plate relative to the second fastening portion, the first connecting mechanism is fastened to the first fastening portion, and the second connecting mechanism is fastened to the second fastening portion.

Optionally, the temperature measuring device further comprises a plugging mechanism, and the plugging mechanism is movably sleeved at the end part of the temperature measuring tube, which is away from the pouring space, and seals the temperature measuring tube.

Optionally, the temperature measuring device further comprises a sealing mechanism, the sealing mechanism comprises a sealing gasket and a sealing sleeve, the sealing gasket and the sealing sleeve are all sleeved on the temperature measuring pipe, the sealing gasket is clamped between the blocking mechanism and the outer side surface of the box girder side plate, and the sealing sleeve is clamped between the temperature measuring pipe and the hole wall of the installation through hole.

Optionally, the temperature measuring device further comprises a plurality of positioning blocks, and the plurality of positioning blocks are fixedly connected to the temperature measuring pipe along the circumferential direction and located in the pouring space.

Optionally, the temperature measuring device still includes elasticity fastening device, elasticity fastening device includes fixed plate, fixed block, elastic element, the fixed plate link firmly in the temperature tube, the via hole is seted up to the fixed plate, the fixed block link firmly in the case roof beam curb plate, elastic element link firmly in the fixed block, work as the temperature tube inserts during the mounting hole, can with the fixed block with elastic element impresses in the via hole, work as the temperature tube is in when the cartridge put in place in the mounting hole, elastic element stretches out the via hole supports to lean on the fixed plate deviates from one side of case roof beam curb plate.

Optionally, the bearing seat further includes a positioning seat fixedly connected to the bearing surface of the base and four limiting seats, one box girder side plate is clamped between each limiting seat and the positioning seat, and the four box girder side plates surround the positioning seat to form the pouring space.

The utility model has the beneficial effects that:

the box girder provided by the utility model comprises a bearing seat, a box girder body and a plurality of temperature measuring devices along the box girder body. The box girder side plate is fixedly connected with the bearing seat, a pouring space is formed in an enclosing mode, and concrete can be poured into the pouring space to form a prefabricated mold. A plurality of mounting through holes are formed in the box girder side plate, the temperature measuring device can be partially inserted into the pouring space, and the other part of the temperature measuring device is located on the outer side, deviating from the pouring space, of the box girder side plate. Through a plurality of temperature measuring devices, in the process of prefabricating the mould, the constructor can conveniently and accurately observe and monitor the real-time temperature change of each control point according to actual conditions.

Drawings

FIG. 1 is a schematic view of a box girder structure provided by an embodiment of the present invention;

FIG. 2 is a schematic view of a box girder carrier according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the structure of FIG. 1, labeled B;

FIG. 4 is a schematic structural diagram of a part of a box girder temperature measuring device provided by an embodiment of the utility model;

fig. 5 is a schematic diagram of the structure labeled a in fig. 1.

In the figure:

100. a bearing seat; 110. a base; 120. positioning seats; 130. a limiting seat;

200. a box girder body; 210. a box girder side plate; 220. a movable rod; 230. pouring a building body;

300. a temperature measuring device; 310. a temperature measuring tube; 320. a plugging mechanism; 330. a sealing mechanism; 331. a gasket; 332. sealing the sleeve; 340. positioning blocks; 350. an elastic fastening mechanism; 351. a fixing plate; 352. a fixed block; 353. an elastic element; 354. an elastic block;

400. a support device; 410. a support bar; 411. a fixed rod part; 412. a movable rod part; 420. a first connecting mechanism; 430. a second connecting mechanism; 440. a first fixing mechanism; 450. a second fixing mechanism; 460. an adjustment mechanism.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Fig. 1 is a schematic view illustrating a box girder structure provided by an embodiment of the present invention, and fig. 2 is a schematic view illustrating a box girder carriage structure provided by an embodiment of the present invention. Referring to fig. 1, the box girder includes a load-bearing seat 100, a box girder body 200, a plurality of temperature measuring devices 300, and a supporting device 400.

Referring to fig. 2, the carrier 100 includes a base 110, a positioning seat 120 and four position-limiting seats 130. The positioning seat 120 is fixedly connected to the middle position of the bearing surface of the base 110 for positioning the subsequent box girder. The four position-limiting seats 130 are distributed around the positioning seat 120, spaced apart from the positioning seat 120, and fixedly connected to the carrying surface of the base 110.

Referring to fig. 1, the box girder body 200 includes a box girder top plate, four box girder side plates 210, a movable bar 220, and a casting body 230. When the box girder is installed, the box girder body 200 is aligned to the positioning seat 120, so that a box girder side plate 210 is clamped between each limiting seat 130 and the positioning seat 120, and the box girder side plate 210 is fixed on the base 110. The four box girder side plates 210 enclose a casting space on the bearing surface.

Specifically, four box girder side plates 210 constitute sides of the box girder, and a box girder top plate, which is flexibly detachable, is provided at the top of the box girder and fixed at the top of the box girder by a movable rod 220. The top positions of two relative case roof beam curb plates 210 have linked firmly two go-between respectively, and go-between on the different case roof beam curb plates 210 one-to-one respectively, and the movable rod 220 is two, can insert corresponding two go-between respectively in proper order, and two movable rods 220 that peg graft are parallel to each other, fix the case roof beam roof and enclose the space entry position of pouring of establishing the formation at four case roof beam curb plates 210.

Specifically, after the box girder side plates 210 are fixed with the aid of the positioning seats 120 and the four limiting seats 130, concrete is poured into the pouring space with the opening at the upper end of the box girder as an entrance, after the box girder is filled with the concrete, the box girder top plate is covered and fixed by the movable rods 220, and after the box girder is completely hardened, the pouring body 230 is formed.

Preferably, the box girder side plates 210 are provided with a wear-resistant layer inside, so that the box girder side plates 210 are prevented from being worn when concrete is poured, and the service life of the box girder side plates is prolonged.

More specifically, the number of the movable rods 220 is two, and the two movable rods 220 are a group and respectively penetrate through the connecting rings of the two opposite box girder side plates 210 to form a groined structure. The box girder top plates can be more firmly fixed by the movable rods 220, the reliability of the pouring body 230 in the box girder is guaranteed, and the problems of box girder cracking and the like can be effectively prevented.

Referring to fig. 1, in order to ensure the reliability of the installation of the box girder, the box girder is further provided with support devices 400 around the box girder, each support device 400 corresponds to one box girder side plate 210, and each support device 400 is respectively connected to the side of the base 110 and the outer side surface of the box girder side plate 210, and plays a role in supporting the box girder side plates 210 in a leaning manner.

Specifically, the supporting device 400 includes a supporting rod 410, a first connecting mechanism 420, a second connecting mechanism 430, a first fixing mechanism 440, and a second fixing mechanism 450. The first connecting mechanism 420 and the second connecting mechanism 430 of the supporting rod 410 are respectively fixedly connected to two ends of the supporting rod 410, the first fixing mechanism 440 is fixedly connected to the outer side surface of the corresponding box girder side plate 210, the second fixing mechanism 450 is fixedly connected to the side portion of the base 110 on the same side with the box girder side plate 210, the first connecting mechanism 420 is connected to the first fixing mechanism 440 in a clamping manner, and the second connecting mechanism 430 can be connected to the second fixing mechanism 450 in a clamping manner.

More specifically, the first fixing mechanism 440 is a U-shaped structure, and includes a first connecting portion and a first fastening portion that are fixedly connected to each other, wherein two support rods of the U-shaped structure that are perpendicularly and fixedly connected to the box girder side plate 210 are the first connecting portion, and a rod portion parallel to the box girder side plate 210 and sandwiched between the two support rods is the first fastening portion. The second fixing mechanism 450 is also a U-shaped structure, and includes a second connecting portion and a second fastening portion that are fixedly connected to each other, wherein two support rods of the U-shaped structure that are perpendicularly fixedly connected to the side portion of the base 110 are the second connecting portion, and a rod portion that is parallel to the side portion of the base 110 and is sandwiched between the two support rods is the second fastening portion. The second connecting portion is longer than the first connecting portion.

More specifically, the first connecting mechanism 420 and the second connecting mechanism 430 are arc-shaped, and when the first connecting mechanism and the second connecting mechanism are respectively fixedly connected to two ends of the supporting rod 410, arc-shaped openings of the first connecting mechanism and the second connecting mechanism are opposite. The first connecting mechanism 420 is fastened to the first fastening portion, the second connecting mechanism 430 is fastened to the second fastening portion, and the supporting rod 410 is installed between the box girder and the carrier base 100. When the box girder side plate 210 is installed on the base 110, because the length of the second connecting portion is greater than that of the first connecting portion, in the direction perpendicular to the outer side surface of the box girder side plate 210, the first fastening portion is close to the box girder side plate 210 relative to the second fastening portion, and the distance from the upper end of the supporting rod 410 to the box girder side plate 210 is smaller than the distance from the lower end of the supporting rod 410 to the side portion of the base 110, so that a triangular supporting structure is formed, and the box girder is stably supported. Each box girder includes two support rods 410, which are respectively installed at opposite sides of the box girder in the above-described manner, to ensure stability of the box girder.

To achieve height adjustability of the box girder, the support mechanism 400 further includes an adjustment mechanism 460. The supporting rod 410 includes a fixed rod portion 411 and a movable rod portion 412 coaxially disposed, the adjusting mechanism 460 is fixedly connected to an end of the fixed rod portion 411 away from the second connecting mechanism 430, the movable rod portion 412 is inserted into the fixed rod portion 411, and the adjusting mechanism 460 can lock the movable rod portion 412 and the fixed rod portion 411.

Specifically, the adjustment mechanism 460 includes a fixing sleeve and a fastening bolt that is screwed to a side wall of the fixing sleeve, and an end portion that protrudes into the fixing sleeve can abut against the movable rod portion 412. The depth of the movable rod part 412 inserted into the fixed rod part 411 is reasonably adjusted according to the heights of different box girder side plates 210, and after the adjustment is proper, the fastening bolt on the adjusting mechanism 460 is screwed, so that the end part of the fastening bolt abuts against the movable rod part 412, and the locking is realized.

Fig. 3 shows a schematic structural diagram of a structural mark B in fig. 1, fig. 4 shows a schematic structural diagram of a part of a box girder temperature measuring device provided by an embodiment of the utility model, and fig. 5 shows a schematic structural diagram of a structural mark a in fig. 1.

Referring to fig. 1 to 4, a plurality of mounting through holes are respectively formed in the two opposite box girder side plates 210 along the height direction of the box girder body 200, and a plurality of temperature measuring devices 300 can be inserted into the plurality of mounting through holes in a one-to-one correspondence manner. When concrete is poured, the temperature measuring device 300 inserted into the installation through hole can conveniently and accurately monitor the change of the internal temperature of the pouring body 230 at any time. The temperature measuring device 300 comprises a temperature measuring tube 310, a plugging mechanism 320, a sealing mechanism 330, a positioning block 340 and an elastic fastening mechanism 350.

Specifically, one end of the temperature measuring tube 310 is closed, the other end is open, and a temperature measuring space is reserved inside the temperature measuring tube. The plugging mechanism 320 can be spirally connected to the open end of the temperature measuring tube 310 outside the box girder side plate 210 to seal the temperature measuring space, as shown in fig. 3. Before concrete pouring, the temperature measuring tube 310 is inserted into the pouring space from the mounting through hole on the box girder side plate 210, the temperature meter is inserted into the temperature measuring tube 310, and the plugging mechanism 320 is screwed to the opening end of the temperature measuring tube 310.

Specifically, in the concrete pouring process, the temperature meters at different positions indicate different temperatures, so that the constructor can monitor the temperature change of each position of the pouring body 230 at any time through the temperature meters, and in the process of prefabricating the formwork, the real-time temperature change of each control point can be conveniently and accurately observed and monitored according to actual conditions.

The thermometer used in this embodiment can be selected from various temperature measuring devices in the prior art, such as a thermometer, an infrared thermometer, etc., and will not be described herein again.

Preferably, the positioning block 340 is provided in plurality and is circumferentially fixed to the temperature measuring pipe 310, and when the temperature measuring pipe 310 is inserted into the installation through hole, the positioning block 340 is located in the casting space, as shown in fig. 4. A plurality of grooves are formed on the positioning block 340 along the direction that the temperature measuring tube 310 is inserted into the mounting through hole. After the concrete is poured to the position of the temperature measuring tube 310, the concrete enters the groove on the positioning block 340, and the positioning blocks are wrapped in the concrete in the hardening process of the concrete, so that the temperature measuring tube 310 and the casting body 230 are firmly fixed.

Preferably, the sealing mechanism 330 of the temperature measuring device 300 includes a sealing gasket 331 and a sealing sleeve 332, the sealing gasket 331 and the sealing sleeve 332 are both sleeved on the temperature measuring tube 310, the sealing gasket 331 is interposed between the blocking mechanism 320 and the outer side surface of the box girder side plate 210, and the sealing sleeve 332 is interposed between the temperature measuring tube 310 and the wall of the mounting through hole.

Specifically, referring to fig. 3, the sealing gasket 331 and the sealing sleeve 332 are made of rubber, the sealing gasket 331 can completely seal and block the gap between the mechanism 320 and the box girder side plate 210, and the sealing sleeve 332 can completely seal the gap between the temperature measuring tube 310 and the wall of the installation through hole. In the process of pouring concrete, the sealing mechanism 330 can effectively prevent concrete from flowing out from the installation through-hole position.

Referring to FIG. 5, the temperature measuring device 300 further includes an elastic fastening mechanism 350, and the elastic fastening mechanism 350 includes a fixing plate 351, a fixing block 352, an elastic member 353, and an elastic block 354. The fixing plate 351 is fixedly connected to the temperature measuring tube 310, the size of the fixing plate is larger than the caliber of the temperature measuring tube 310, and the fixing plate can completely cover the entrance of the temperature measuring space. The fixing plate 351 is provided with a through hole, the fixing block 352 penetrates through the through hole and is fixedly connected to the box girder side plate 210, the elastic element 353 is fixedly connected to the fixing block 352, and the elastic block 354 is fixedly connected to the free end of the elastic element 353.

Specifically, when the temperature measuring tube 310 is inserted into the mounting through hole, the fixing block 352 and the elastic element 353 can be pressed into the through hole, and when the temperature measuring tube 310 is inserted into the mounting through hole in place, the elastic block 354 extends out of the through hole and abuts against one side of the fixing plate 351, which is far away from the box girder side plate 210, so that the temperature measuring tube 310 is fixed on the box girder side plate 210.

And particularly, after the temperature measurement is finished, the temperature instrument is taken out, after the casting body 230 is completely hardened, the part of the temperature measuring pipe 310 extending out of the box girder side plate 210 is cut off, concrete is injected into the temperature measuring space in the temperature measuring pipe 310, and after the temperature measuring pipe is completely hardened, the whole prefabrication process is finished.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A box girder, comprising:

a carrier (100), the carrier (100) comprising a base (110);

the box girder comprises a box girder side plate (210), wherein the box girder side plate (210) is fixedly connected to a bearing surface of the base (110), the box girder side plate (210) surrounds the bearing surface to form a pouring space, and the box girder side plate (210) is provided with a plurality of mounting through holes along the height direction of the box girder body (200);

the temperature measuring devices (300) are inserted into the mounting through holes in a one-to-one correspondence mode, each temperature measuring device (300) comprises a temperature measuring pipe (310), and the temperature measuring pipes (310) stretch into the pouring space.

2. The box girder according to claim 1, further comprising a support device (400), wherein the support device (400) comprises a support bar (410), and the support bar (410) is connected to the outer side surfaces of the base (110) and the box girder side plates (210), respectively.

3. The box beam of claim 2, wherein the supporting device (400) further comprises a first connecting mechanism (420), a second connecting mechanism (430), a first fixing mechanism (440) and a second fixing mechanism (450), the first connecting mechanism (420) and the second connecting mechanism (430) are respectively fixedly connected to two ends of the supporting rod (410), the first fixing mechanism (440) is fixedly connected to the outer side surface of the box beam side plate (210), the second fixing mechanism (450) is fixedly connected to the base (110), the first connecting mechanism (420) is clamped to the first fixing mechanism (440), and the second connecting mechanism (430) is capable of being clamped to the second fixing mechanism (450).

4. The box girder according to claim 3, wherein the supporting device (400) further comprises an adjusting mechanism (460), the supporting rod (410) comprises a fixed rod part (411) and a movable rod part (412) which are coaxially arranged, the adjusting mechanism (460) is fixedly connected to the fixed rod part (411), the movable rod part (412) is inserted into the fixed rod part (411), and the adjusting mechanism (460) can lock the movable rod part (412) and the fixed rod part (411).

5. The box beam of claim 3, wherein the first securing mechanism (440) comprises a first connecting portion and a first fastening portion that are fixedly connected to each other, the first connecting portion is fixedly connected to the box beam side plate (210), the second securing mechanism (450) comprises a second connecting portion and a second fastening portion that are fixedly connected to each other, the second connecting portion is fixedly connected to the base (110) side portion, the first fastening portion is close to the box beam side plate (210) relative to the second fastening portion in a direction perpendicular to the outer side surface of the box beam side plate (210), the first connecting mechanism (420) is fastened to the first fastening portion, and the second connecting mechanism (430) is fastened to the second fastening portion.

6. The box girder according to claim 1, wherein the temperature measuring device (300) further comprises a plugging mechanism (320), and the plugging mechanism (320) is movably sleeved on the end of the temperature measuring pipe (310) away from the pouring space to seal the temperature measuring pipe (310).

7. The box girder according to claim 6, wherein the temperature measuring device (300) further comprises a sealing mechanism (330), the sealing mechanism (330) comprises a sealing gasket (331) and a sealing sleeve (332), the sealing gasket (331) and the sealing sleeve (332) are sleeved on the temperature measuring pipe (310), the sealing gasket (331) is clamped between the blocking mechanism (320) and the outer side surface of the box girder side plate (210), and the sealing sleeve (332) is clamped between the temperature measuring pipe (310) and the wall of the installation through hole.

8. The box girder according to claim 1, wherein the temperature measuring device (300) further comprises a plurality of positioning blocks (340), and the plurality of positioning blocks (340) are circumferentially fixedly connected to the temperature measuring pipe (310) and located in the casting space.

9. Box girder according to claim 1, characterised in that the temperature measuring device (300) further comprises an elastic fastening mechanism (350), the elastic fastening mechanism (350) comprises a fixing plate (351), a fixing block (352) and an elastic element (353), the fixing plate (351) is fixedly connected with the temperature measuring tube (310), a through hole is formed in the fixing plate (351), the fixed block (352) is fixedly connected with the box girder side plate (210), the elastic element (353) is fixedly connected with the fixed block (352), when the temperature measuring tube (310) is inserted into the mounting through hole, the fixing block (352) and the elastic element (353) can be pressed into the through hole, when the temperature measuring pipe (310) is inserted in the mounting through hole in place, the elastic element (353) extends out of the through hole and abuts against one side, away from the box girder side plate (210), of the fixing plate (351).

10. The box girder according to any one of claims 1 to 9, wherein the load bearing base (100) further comprises a positioning base (120) and four limiting bases (130) fixedly connected to the bearing surface of the base (110), one box girder side plate (210) is sandwiched between each limiting base (130) and the positioning base (120), and the four box girder side plates (210) surround the positioning base (120) to form the casting space.