CN112227227A

CN112227227A - Construction method of large-span beam column type support

Info

Publication number: CN112227227A
Application number: CN202011132807.2A
Authority: CN
Inventors: 顾刘东; 黄洪盛; 薛玖强; 邓浩宇; 蒋获伟
Original assignee: China Railway No 8 Engineering Group Co Ltd; First Engineering Co Ltd of China Railway No 8 Engineering Group Co Ltd
Current assignee: China Railway No 8 Engineering Group Co Ltd; First Engineering Co Ltd of China Railway No 8 Engineering Group Co Ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-01-15
Anticipated expiration: 2040-10-21
Also published as: CN112227227B

Abstract

The invention relates to the field of bridge construction, and discloses a construction method of a large-span beam column type support, which comprises the following steps of 1: assembling a bracket, and step 2: assembling unloading equipment, and step 3: column installation, step 4: installing unloading equipment, namely fixing the unloading equipment in the step 2 on the top surfaces of the stand columns in the step 3 one by one through bolts, wherein the driving arms of the unloading equipment are required to be kept on the same straight line; and 5: and (2) mounting a support, wherein the bearing beam is respectively mounted on a driving arm of the unloading device between the two piers, the driving arm drives the supporting platform to move upwards under the action of gravity of the bearing beam and supports the bearing beam, and the support in the step 1 is hoisted on the bearing beam between the two piers. The problems of long time consumption and high cost of the procedures in the cast-in-place construction process of the large-span simply supported beam bridge support are solved through the implementation scheme.

Description

Construction method of large-span beam column type support

Technical Field

The invention relates to the field of bridge construction, in particular to a construction method of a large-span beam column type support.

Background

In the process of bridge construction, after the piers are constructed, a support (also called a bailey frame) for connecting the two piers is required to be built between the two piers, then the bridge main body is constructed, and after the bridge main body is constructed, the support is detached. With the continuous development of bridge construction, in the prior art, the distance between two piers is usually 35 meters or more for a large-span bridge, and in the construction process, more construction difficulties and high construction cost need to be overcome; if in order to ensure that the support between two piers has stable supporting force, at least one supporting platform needs to be built between the two piers so as to support the middle part of the support. But need again wholly demolish supporting platform after bridge main part construction finishes, so not only can prolong whole time limit for a project, still can lead to the waste of manpower, material resources, financial resources, especially to the more complicated area of geological environment (if when the geology is softer, supporting platform's bearing capacity is difficult for satisfying the requirement, and the construction degree of difficulty is great and construction cost is higher when the geology is harder). In addition the setting up of support needs to be used the equipment that unloads, and among the prior art, this equipment need respectively to every equipment connecting tube that unloads when using fill sand or arrange sand in order to the equipment that unloads to the height adjustment of cooperation jack in order to realize the equipment that unloads, still need seal the mouth of filling sand after filling sand in addition and accomplishing. Therefore, the construction process in the whole construction process is more, long in time consumption and high in cost.

Disclosure of Invention

The invention aims to provide a construction method of a large-span beam column type support, and aims to solve the problems that the process in the construction process of a large-span bridge is long in time consumption and high in cost.

In order to achieve the purpose, the invention adopts the following technical scheme: a construction method of a large-span beam column type support comprises the following steps,

step 1: assembling a support, namely welding support columns between two I-shaped cross beams at equal intervals vertically to form independent support parts, welding inclined reinforcing ribs between the support columns and the cross beams, connecting the cross beams of the support parts end to form a support frame, and connecting the grooves of two adjacent cross beams through reinforcing blocks; the end parts of the two adjacent support frames are hinged through a foldable connecting piece;

step 2: preparing unloading equipment, wherein the unloading equipment comprises a cylindrical barrel provided with a concave cavity and a supporting table in sliding fit in the cylindrical barrel, an accommodating cavity for accommodating fillers is arranged in the bottom wall of the cylindrical barrel and is communicated with the concave cavity, and a control piece for controlling the on-off of the accommodating cavity and the concave cavity is arranged on the cylindrical barrel;

and step 3: mounting the stand columns, embedding a plurality of groups of locking mechanisms on the bearing platform, wherein the central lines of the locking mechanisms are on the same straight line, each group of locking mechanisms comprises at least 4L-shaped bolts, welding a flange plate at the bottom of each steel pipe stand column, and connecting the flange plate of each steel pipe stand column with the embedded bolts in a threaded manner;

and 4, step 4: installing the unloading equipment, namely inverting the unloading equipment in the step 2, opening the control piece to enable the filler in the accommodating cavity to enter the concave cavity, closing the control piece and rightly placing the inverted unloading equipment when the filler enters the concave cavity at the required height, enabling the support table to increase the height of the whole unloading equipment under the support of the filler, and bolt-fixing the heightened unloading equipment on the top surfaces of the stand columns in the step 3 one by one;

and 5: and (3) mounting a support, namely placing the bearing beam on the support table of each unloading device in the step (4), and hoisting the support in the step (1) on the bearing beam between two piers.

The principle and the advantages of the scheme are as follows:

1. the flexural strength of the large-span support is enhanced, so that a supporting platform does not need to be additionally built in the middle of the support during construction. In the scheme, the reinforcing blocks are arranged in the grooves at the connecting parts among the supporting parts, so that the adjacent beams on the left side and the right side are forced to be kept on the same straight line, and the bending strength is increased to a great extent; secondly, a plurality of parallel support frames are arranged, and inclined reinforcing ribs are arranged between the transverse support parts and the pillars, so that the load on the support is dispersed, and the bearing capacity and the bending strength of the support are enhanced. From the test chart in fig. 11, it can be seen that the maximum vertical deformation of the bracket is 4.71cm, and less than 2800/400 which is 7cm, which meets the requirement.

2. The construction process is reduced:

A) a temporary supporting platform is not required to be built in the middle of the support, and the construction of the platform comprises bearing platform/foundation pile construction, installation and construction of at least 10 steel pipe supports, connection construction among the steel pipe supports and installation of unloading equipment;

B) a temporary supporting platform is not required to be built, so that a platform disassembling process is omitted;

C) the unloading equipment in this scheme is from taking the filler, only needs opening or closing of control piece can accomplish the height control who unloads equipment, and before the installation, only need open the control piece and pour the filler that holds in the chamber into the cavity promptly, has just accomplished the increase of unloading equipment height, also only need open the control piece when follow-up demolishs and make the filler in the cavity return automatically under its action of gravity and flow back and hold the chamber in, just accomplish the high decline of unloading equipment. Compared with the prior art, this scheme need not to reuse extra auxiliary assembly, also need not to constantly repeat the work of filling sand and arranging sand again, only need open or close control and just, anti-placing unload equipment can, easy operation is rapid.

3. The construction period is shortened: every time a supporting platform is built and dismantled, 3 workers need to build a construction period of 1 day each, and according to a section of 6000m long bridge, about 170 temporary supporting platforms need to be built and dismantled, so that the construction period of 170 days of the 3 workers is consumed. Meanwhile, the sand filling and discharging actions of more than 3000 discharging devices need to be completed, and the construction period of about 20 days is consumed by 1 worker. Therefore, after the construction method is adopted, 1 worker can be saved for 18 months in an accumulated way.

4. The construction cost is saved:

A) by adopting the construction method, nearly two hundred temporary supporting platforms (according to the statistics of a construction party, the building material cost of each supporting platform is about 32000 yuan, the equipment cost is about 4000 yuan, the labor cost is about 9000 yuan) do not need to be built and dismantled, and the cost is saved by about seventy-hundred and more ten thousand yuan in total.

B) In addition, the mode that embedded steel bars and flanges in the prior art are replaced by bolts of embedded L-shaped structures is adopted in the scheme, each upright post saves the material cost of the steel bars and the flanges by about 300 yuan, and each bearing platform at least builds 10 upright posts, so that 60 more than ten thousand material costs are saved for a bridge of 6000 meters in length.

5. The installation and the dismantlement of support have been accelerated: when the supports need to be disassembled and transported, the two support frames can be drawn together and folded by pulling the folding part of the connecting piece, so that on one hand, the occupied space is saved, on the other hand, the fastening device of the connecting piece and the support frames does not need to be manually disassembled, the disassembling and assembling period is greatly shortened, and meanwhile, the labor cost is also saved; when the support is required to be installed, only the two support frames need to be stretched outwards, and the operation is convenient and quick.

Preferably, as an improvement, in step 2, one end of the control member is located in the accommodating cavity, the other end of the control member is located outside the cylindrical barrel, and the control member is in threaded connection with the cylindrical barrel. Through the arrangement, when the height of the unloading equipment needs to be adjusted, the communicating part of the accommodating cavity and the cavity can be quickly opened or closed only by screwing the control piece.

Preferably, as an improvement, in step 2, a communicating portion between the accommodating cavity and the cavity is a funnel-shaped communicating hole, one end of the control member located in the accommodating cavity is tapered, and the taper is matched with the communicating hole. Through setting the intercommunicating pore to hopper-shaped, both satisfied the taper fit of control with the intercommunicating pore and reached good encapsulated situation on the one hand, on the other hand, no matter the filler flows into the cavity from holding the chamber or flows into from the cavity and holds the chamber and can both play a water conservancy diversion purpose.

Preferably, as a modification, in step 1, the connecting member includes two connecting plates whose ends are hinged to each other. Through the arrangement, when the transportation needs to be disassembled, the hinged part of the two connecting plates is pulled to rotate upwards, so that the two supporting frames can be mutually drawn together and folded. When the support is required to be installed, the two support frames only need to be stretched outwards or the hinged part of the two connecting plates is pushed downwards.

Preferably, as an improvement, a limit plate for keeping the two connection plates on the same plane is provided on an upper side of one of the connection plates. Therefore, the situation that the connecting piece cannot be kept on the same plane and is unstable due to the fact that the force is applied violently or other external forces are not concerned.

Preferably, as an improvement, a first flange plate is welded at the bottom of the cylindrical barrel in the step 2, and a second flange plate corresponding to the first flange plate is welded at the upper end of the steel pipe column in the step 3. Through the arrangement, the equipment for unloading and the steel pipe stand column are convenient to install and detach.

Preferably, as an improvement, two ends of the reinforcing block are respectively in threaded connection with two adjacent cross beams, the length of the reinforcing block is 5-10cm, and the thickness of the reinforcing block is consistent with the depth of the groove. Through the arrangement, the two ends of the reinforcing block are respectively positioned in the grooves of the left cross beam and the right cross beam, the upper surface of the reinforcing block is abutted against the upper top surfaces of the grooves of the two cross beams, and the lower surface of the reinforcing block is abutted against the lower bottom surfaces of the grooves of the two cross beams, so that the cross beams on the left side and the right side are kept on the same straight line under the action of the reinforcing block even if the connecting part of the two cross beams has a downward deformation trend.

Preferably, as a modification, in step 3, a lumbar brace is bolted between the steel pipe columns. So as to ensure the stability of the whole system of the steel tube upright post.

Preferably, as an improvement, a limiting mechanism is arranged on the supporting platform and the cylindrical barrel, the limiting mechanism comprises a lower flange formed by extending the bottom edge of the supporting platform outwards, and an upper flange corresponding to the lower flange is formed by extending the top of the cylindrical barrel inwards. Through the arrangement, the problem that the two are separated from each other under the action of transitional external force is avoided.

Preferably, as an improvement, the method further comprises the step 6: the support is dismantled, and earlier it is fixed to connect the support through the device that falls, opens the control on the equipment that unloads again, and the filler of filling in the cavity flows back and gets into and hold the chamber, and the brace table loses the support of filler and falls back to cylinder bottom, and after forming the space that falls between support and the equipment that unloads this moment, demolish steel pipe stand, spandrel girder, utilize the jack to transfer the support slowly and transport to next construction section at last.

Drawings

Fig. 1 is a schematic front view of a structure in embodiment 1 of the present invention.

Fig. 2 is a partial front view structural diagram of the stent in example 1.

Fig. 3 is a right side view of the stand in example 1 (a state in which each stand is unfolded).

Fig. 4 is a right side view of the supporting frames in example 1 (a state view after each supporting frame is folded).

FIG. 5 is a longitudinal sectional view of the dropping device in example 1.

FIG. 6 is an enlarged view of the point B in FIG. 5

Fig. 7 is an enlarged schematic view of a portion a in fig. 2 (specifically, a connection portion between two adjacent cross beams).

Fig. 8 is a right longitudinal sectional view of fig. 7.

Fig. 9 is a front view of the drop-off device of example 2.

Fig. 10 is a schematic structural view of the drop-off device in example 2.

Fig. 11 is a force test chart of the stent (used in the summary effect section).

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a support frame 1, a cross beam 2, a reinforcing block 3, a reinforcing rib 4, a support column 5, a connecting piece 6, a left connecting plate 7, a right connecting plate 8, a limiting plate 9, a discharging device 10, a cylindrical drum 11, a supporting table 12, a control piece 13, an accommodating cavity 14, a cavity 15, a communication hole 16, a positioning arm 17, a driving groove 18, a guide groove 19, a connecting pin 20, a bearing beam 21, an upright column 22 and a support 23.

Example 1

The embodiment is basically as shown in the attached figures 1-8: a construction method of a large-span beam column type support comprises the following steps,

step 1: assembling the support, as shown in fig. 2, vertically welding a pillar 5 between two cross beams 2 with the cross sections being in an i shape to form an independent support part, welding two reinforcing ribs 4 which are obliquely upward and obliquely downward between the pillar 5 and the cross beam 2, and forming a parallelogram structure by the reinforcing ribs 4 between two adjacent upright columns 22. The cross beams 2 of the plurality of supporting parts are connected end to form the supporting frame 1.

When the supporting parts are assembled, as shown in fig. 7-8, the end surfaces of the left and right adjacent cross beams 2 are abutted, and the reinforcing block 3 with the width consistent with the width of the groove of the cross beam 2 is installed in the groove of the two cross beams 2, namely, the left end of the reinforcing block 3 is welded in the groove of the left cross beam 2, the right end of the reinforcing block 3 is in threaded connection with the groove of the right cross beam 2, the length of the reinforcing block 3 is preferably 5-10cm, and the thickness of the reinforcing block 3 is consistent with the depth of the groove. And finally, respectively installing the cross beams 2 on the upper side and the lower side of the support frame 1 to further reinforce, wherein the positions of the joints between the installed cross beams 2 and the joints of the adjacent support parts are different (non-same vertical surfaces).

As shown in fig. 3 and 4, three support frames 1 are connected to form a group, so that on one hand, the contact area between the support frame 1 and the upright column 22 below the support frame is expanded to enhance the stability of the support frame 1; on the other hand, when the support frame 1 is hoisted, the connection is convenient and the hoisting is rapid. The end parts of two adjacent support frames 1 are connected through a connecting piece 6, the mounting positions of the connecting pieces 6 between every two support frames 1 are different (non-same horizontal plane), namely the connecting pieces 6 between the two support frames 1 on the left side are mounted on the upper sides of the end surfaces of the two support frames 1, and the connecting pieces 6 between the two support frames 1 on the right side are mounted on the lower sides of the end surfaces of the two support frames 1. Connecting piece 6 includes left connecting plate 7 and the right connecting plate 8 of tip articulated each other, left connecting plate 7 articulates on the terminal surface of left side support frame 1, right connecting plate 8 articulates on the terminal surface of right side support frame 1, and integrated into one piece has limiting plate 9 on the extension line of left connecting plate 7 is followed to the last top surface of left connecting plate 7 right-hand member, when consequently each support frame expandes, under limiting plate 9's effect, make left connecting plate 7 and right connecting plate 8 keep on same straight line, in order to reach the purpose of outrigger.

Step 2: the unloading device 10 is prepared, as shown in fig. 5 and 6, the unloading device 10 includes a cylindrical barrel 11 provided with a cavity 15 and a support table 12 slidably fitted in the cylindrical barrel 11, the support table 12 and the cylindrical barrel 11 are provided with a limiting mechanism to avoid the problem that the support table 12 and the cylindrical barrel 11 are separated from each other under the action of external force, specifically, the bottom edge of the support table 12 extends outwards in a circumferential direction to form a lower flange, and the top of the cylindrical barrel 11 extends inwards to form an upper flange corresponding to the lower flange.

The bottom wall of the cylinder 11 is provided with a holding cavity 14 for holding filler, which is sand in this embodiment. The accommodating cavity 14 is communicated with the cavity 15 through a communicating hole 16, the communicating hole 16 is funnel-shaped (namely, the two ends are large and the middle is small), and a control piece 13 for controlling the communication or disconnection of the accommodating cavity 14 and the cavity 15 is connected to the cylindrical barrel 11 in a threaded mode. One end of the control piece 13 is positioned in the accommodating cavity 14, the other end of the control piece is positioned outside the cylindrical barrel 11, so that the screwing operation is convenient, one end of the control piece 13 positioned in the accommodating cavity 14 is conical, and the conical degree of the control piece is matched with the communication hole 16.

And step 3: the method comprises the following steps that (1) stand columns 22 are installed, a plurality of groups of locking mechanisms are pre-embedded on a bearing platform, the central lines of the locking mechanisms of each group are on the same straight line, each group of locking mechanisms comprises 6L-shaped bolts, the 6 bolts enclose a circle, flange plates are welded at the bottom and the top of each steel pipe stand column 22 respectively, and the flange plates at the bottom of each steel pipe stand column 22 are in threaded connection with the pre-embedded bolts of each group;

with bolted connection waist brace between each steel pipe stand 22, the waist brace includes upper and lower two-layer channel-section steel bridging, at pier a week bolted connection staple bolt, is connected the channel-section steel connecting elements between staple bolt and the steel pipe stand 22 to guarantee the stability of the whole system of steel pipe stand 22.

And 4, step 4: installing the unloading equipment 10, screwing the control piece 13 to enable the accommodating cavity 14 to be communicated with the concave cavity 15, inverting the unloading equipment 10 to enable sand in the accommodating cavity 14 to automatically flow into the concave cavity 15, when the sand entering the concave cavity 15 reaches a required height, turning the control piece 13 to close the communication hole 16 and then rightly placing the inverted unloading equipment 10, enabling the support table 12 to increase the height of the whole unloading equipment 10 under the support of the sand, and bolt-fixing the heightened unloading equipment 10 on the top surfaces of the steel pipe columns 22 in the step 3 one by one;

and 5: installing a support 23, namely forming a bearing beam 21 by arc welding at least 3I-shaped steels, transversely placing one bearing beam 21 on the support table 12 of each unloading device 10 in the step 4, welding and fixing, and after the bearing beams of two adjacent piers are respectively installed, hoisting the support 23 in the step 1 on the bearing beams 21 on two sides, thus completing the installation of the support 23.

Step 6: the dismantlement of support 23 is earlier connected fixedly support 23 through the cooperation of falling the shelf device (promptly the center-penetrating jack and screw thread jib, for prior art, and it is no longer repeated here) to play the pulling force effect to support 23 and avoid support 23 to take place longitudinal displacement. The control member 13 of the unloading device 10 is screwed to connect the containing cavity and the cavity, and the filler filled in the cavity 15 flows back into the containing cavity 14, and the support table 12 falls back to the bottom of the cylinder 11 after losing the support of the filler. After a sufficient space is formed between the bracket 23 and the unloading device 10 at the moment, the bearing beam 21, the waist support, the steel pipe upright post 22 and the like are dismantled, and finally the bracket 23 is slowly lowered down by using a jack and is transported to the next construction section.

So compare current equipment 10 sand discharging technique of unloading, need not to connect long pipeline one end through the manual work again and lie in the eminence when the sediment outflow on the equipment of unloading of eminence, the other end is connected at the subaerial pump of installing, and the starting pump carries out the sediment outflow, still need the manual work to climb to the eminence after the sediment outflow finishes and dismantle the pipeline and treat the equipment 10 of unloading of sediment outflow to the next department and connect the installation, on the one hand very big simplification the construction steps, construction efficiency is improved, on the other hand is more important, workman's intensity of labour has been alleviateed to a very big extent, only need twist soon the control 13 can.

Example 2

The difference between this embodiment and embodiment 1 is that, as shown in fig. 9 and 10, in step 2, positioning mechanisms are respectively installed on two corresponding sides of the outer side wall of the cylindrical barrel 11, and each positioning mechanism comprises a positioning arm 17 with two end portions hinged on the outer side wall of the cylindrical barrel 11, and the hinged point is installed at a position higher than the bottom wall of the supporting table 12 when all sand in the accommodating cavity 14 enters the cavity 15, so as to avoid sand overflowing from the guide groove 19.

The two positioning arms 17 are symmetrically arranged along the central line of the cylindrical barrel 11, a horizontal driving groove 18 is formed in the peripheral surface of the supporting table, a connecting pin 20 is welded on the positioning arms 17, and the connecting pin 20 penetrates through the side wall of the outer cylindrical barrel, extends into the driving groove 18 and is in sliding connection with the driving groove 18. The slot shape of the driving slot 18 is T-shaped and the free end of the connecting pin 20 is T-shaped to match the slot shape of the driving slot 18 to avoid separation of the two when they are slip-fitted. Because the cross section of the support platform is circular, the distance between the two sides of the driving groove and the driving arm is larger than the distance between the middle part of the driving groove 18 and the driving arm, and therefore the connecting pin 20 adopts a telescopic structure, and the connecting pin 20 has an extending space in the swinging process of the positioning arm 17.

A guide groove 19 is formed in the side wall of the cylindrical barrel 11 along the movement track of the connecting pin 20, the guide groove is in a splayed shape, and the connecting pin 20 slides in the guide groove 19.

In step 5, the girder and the unloading apparatus 10 do not need to be welded, and the girder 21 is simply placed transversely in the two positioning arms 17 on each support table 12 in step 4.

In actual operation, because the end of the positioning arm 17 is hinged to the cylindrical barrel 11, and the driving slot 18 on the supporting platform 12 is horizontally arranged along the peripheral wall of the supporting platform, in step 4, the supporting platform 12 moves upwards to drive the free ends of the two positioning arms 17 to fold inwards, so as to form a positioning space for positioning the load-bearing beam 21, and in step 5, the load-bearing beam is placed in the positioning space on each supporting platform 12, so that the two positioning arms 17 position the load-bearing beam, and the load-bearing beam is prevented from lateral displacement. When the disassembly is needed, the disassembly of the load-bearing beam 21 can be automatically completed through the operation of step 6, that is, during the process of dropping back the support platform 12, the connecting pin 20 gradually moves along the two sides of the driving slot 18, so as to drive the two positioning arms 17 to open outwards to separate from the positioning of the load-bearing beam 21.

After implementing this scheme, will need not again the manual work and carry out a large amount of weldment work to thousands of equipment 10 that unloads, also need not to tear open the welding to it when dismantling again, consequently saved a large amount of manpower and materials financial resources on the one hand, on the other hand, because the damage to spare part among welding and the tear-off welding process is very big, consequently this scheme has greatly protected construction equipment, and market prospect is great to the construction field.

The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. A construction method of a large-span beam column type support is characterized in that: comprises the following steps of (a) carrying out,

and 4, step 4: installing the unloading equipment, opening the control piece to pour the filler in the accommodating cavity into the cavity, closing the control piece when the filler enters the cavity at the required height, increasing the height of the whole unloading equipment by the support of the filler by the support table, and bolt-fixing the heightened unloading equipment on the top surfaces of the stand columns in the step 3 one by one;

2. The construction method of the large-span beam-column type bracket according to claim 1, characterized in that: in the step 2, one end of the control part is positioned in the containing cavity, the other end of the control part is positioned outside the cylindrical barrel, and the control part is in threaded connection with the cylindrical barrel.

3. The construction method of the large-span beam-column type bracket according to claim 2, characterized in that: in the step 2, the communicating part of the accommodating cavity and the concave cavity is a funnel-shaped communicating hole, one end of the control piece, which is positioned in the accommodating cavity, is conical, and the conical degree is matched with the communicating hole.

4. The construction method of the large-span beam-column type bracket according to claim 3, characterized in that: in step 1, the connecting piece comprises two connecting plates with mutually hinged ends.

5. The construction method of the large-span beam-column type bracket according to claim 4, characterized in that: and a limiting plate for keeping the two connecting plates on the same plane is arranged on the upper side of one connecting plate.

6. The construction method of the large-span beam-column type bracket according to claim 5, characterized in that: and (3) welding a first flange plate at the bottom of the cylindrical barrel in the step (2), and welding a second flange plate corresponding to the first flange plate at the upper end of the steel pipe upright in the step (3).

7. The construction method of the large-span beam-column type bracket according to claim 6, characterized in that: two ends of the reinforcing block are respectively in threaded connection with the two adjacent cross beams, the length of the reinforcing block is 5-10cm, and the thickness of the reinforcing block is consistent with the depth of the groove.

8. The construction method of a long-span beam-column type bracket according to claim 7, characterized in that: and step 3, connecting waist supports among the steel pipe columns through bolts.

9. The construction method of a long-span beam-column type bracket according to any one of claims 8, characterized in that: the supporting table and the cylindrical drum are provided with limiting mechanisms, the limiting mechanisms comprise lower flanges formed by outwards extending the bottom edges of the supporting table, and the top of the cylindrical drum inwards extends to form upper flanges corresponding to the lower flanges.

10. The construction method of a long-span beam column type bracket according to claims 1 to 9, characterized in that: further comprising the step 6: the support is dismantled, and earlier it is fixed to connect the support through the device that falls, opens the control on the equipment that unloads this moment, and the filler of packing in the cavity flows back and gets into and hold the chamber, and the brace table loses the support of filler and falls back to cylinder bottom, forms the space that falls after the support this moment between support and the equipment that unloads, demolishs steel pipe stand, spandrel girder, utilizes the jack to transfer the support slowly and transports to next construction section at last.