Steel-concrete composite beam cast-in-place formwork supporting system and operation method

Abstract

The invention belongs to the technical field of bridge construction, and particularly relates to a steel-concrete composite beam cast-in-place formwork supporting system and an operation method.A steel box chamber is provided with an inverted-trapezoid-shaped cavity used for concrete pouring, and at least two pairs of preformed holes are correspondingly formed in two webs of the inverted-trapezoid-shaped cavity; connecting lines between the circle centers of each pair of preformed holes extend in the horizontal direction and are parallel to each other; the steel-concrete composite beam cast-in-place formwork supporting system comprises a supporting system used for supporting a steel box chamber, and two web plates are arranged on the supporting system; and the double-cantilever adjustable beam comprises a middle supporting adjustable beam and two end cantilever adjustable beams detachably connected to the two ends of the middle supporting adjustable beam respectively, the middle supporting adjustable beam penetrates through each pair of preformed holes, the two end cantilever adjustable beams are used for supporting the supporting system, and the supporting system is installed on the two end cantilever adjustable beams. According to the method, erecting of a formwork supporting frame or welding of a high-altitude overhanging support can be avoided, and the method can be suitable for steel-concrete composite beams within a certain height range and can be repeatedly used.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a cast-in-place formwork support system for a steel-concrete composite beam and an operation method. Background Art

[0002] The concrete bridge deck is cast in place or prefabricated after the steel structure part of the steel-concrete composite beam is hoisted. The steel-concrete composite beam has been increasingly widely used due to its low steel consumption, high rigidity and good fire resistance.

[0003] The cast-in-place part of the concrete slab on the top of the steel-concrete composite beam can be cast by full-bridge support or welded cantilever hanging basket. The former needs to be erected from under the piers of the bridge, which consumes a large amount of supporting materials and is difficult to apply to the construction of high-altitude bridges. The latter requires a large amount of high-altitude welding operations, the welding quality is difficult to guarantee and the high-altitude welding operations are more dangerous. In addition, the welding materials of the hanging basket are usually not reused, resulting in poor safety and economy. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a cast-in-place formwork support system and an operation method for a steel-concrete composite beam, which can improve the safety and economy of casting the steel-concrete composite beam.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention provides a cast-in-place formwork support system for steel-concrete composite beams, which is installed on a bridge pier. A steel box chamber is arranged on the bridge pier. The steel box chamber has an inverted trapezoidal cavity for pouring concrete. Two webs of the inverted trapezoidal cavity are provided with at least two pairs of reserved holes correspondingly. The connecting line between the centers of circles of each pair of the reserved holes extends in the horizontal direction and is parallel to each other; a support system for supporting the steel box chamber, and the two webs are placed on the support system; and a plurality of groups of double cantilever adjustable beams, each group of the double cantilever adjustable beams comprises a middle support adjustable beam and two end cantilever adjustable beams respectively detachably connected to the two ends of the middle support adjustable beam, each of the middle support adjustable beams respectively passes through each pair of the reserved holes, and the two end cantilever adjustable beams are used to support the support system, and the support system is installed on the plurality of groups of the end cantilever adjustable beams.

[0007] Preferably, the middle supporting adjustable beam comprises two middle chords and a plurality of adjustable webs, each of the middle chords respectively passes through each pair of the reserved holes, and the plurality of adjustable webs are slidably connected between the two middle chords to adapt to a preset distance between the two middle chords; each of the end cantilever adjustable beams comprises two upper chords, two lower chords and a plurality of adjustable webs, the distance between the two pairs of upper chords and the lower chords is the same as the distance between the two middle chords, and the plurality of adjustable webs are slidably connected between each pair of upper chords and the lower chords to adapt to a preset distance between the upper chords and the lower chords; the two pairs of upper chords and the lower chords are respectively detachably connected to the four ends of the middle chord in the length direction to form two parallel rod-like structures extending along the surface direction of the pier.

[0008] Preferably, it also includes a connection system; the connection system includes: two upper connection devices, two lower connection devices, four side connection devices, two lifting shafts, two first transverse connection plates and two second transverse connection plates; each of the upper connection devices and each of the lower connection devices are respectively detachably connected to the two upper ends and the two lower ends of the middle chord, the four side connection devices are connected to the upper chord and the lower chord and are correspondingly connected to the upper ends and the lower ends of the middle chord, and the two lifting shafts are respectively rotatably connected between the upper connection devices and the side connection devices and between the lower connection devices and the side connection devices; the two first connection plates are used to transversely connect the two upper chords and their corresponding middle chords, and the two second connection plates are used to transversely connect the two lower chords and their corresponding middle chords.

[0009] Preferably, each of the upper connecting devices includes: a first connecting sleeve, a first connecting bolt, a fixed pulley group and a first guide ring, each of the first connecting sleeves is respectively inserted into the two ends of the middle chord rod located above, the bottom surface of the first connecting sleeve is provided with a through first groove for one end of the middle chord rod to slide therein, the top surface of the first connecting sleeve is provided with a plurality of connecting bolt holes, the middle chord rod located above is provided with a plurality of first connecting holes, the plurality of connecting bolt holes and the plurality of first connecting holes are fixed by the first connecting bolts, the fixed pulley group is provided on the top surface of the first connecting sleeve to change the force direction of the end cantilever adjustable beam lifting sling, and the first guide ring is provided on the first connecting sleeve away from the middle chord One side of the rod is used to rotatably connect the lifting shaft; each of the lower connecting devices includes a second connecting sleeve, a second connecting bolt and a second guide ring, each of the second connecting sleeves is respectively inserted into the two ends of the middle chord rod located below, the top surface of the second connecting sleeve is provided with a through second groove for the other end of the middle chord rod to slide therein, the bottom surface of the second connecting sleeve is provided with a plurality of connecting bolt holes, and the middle chord rod located below is correspondingly provided with a plurality of first connecting holes, the plurality of connecting bolt holes and the plurality of first connecting holes are fixed by the second connecting bolts, and the second guide ring is provided on the side of the second connecting sleeve away from the middle chord rod, so as to rotatably connect the lifting shaft; each of the side connecting devices includes a third A connecting sleeve, a fastening assembly and a third connecting bolt, wherein each of the third connecting sleeves is formed with a third groove for the ends of the upper chord rod and the lower chord rod to be inserted into for connecting the middle chord rod, the third connecting sleeve is formed inside, a plurality of bolt holes are correspondingly arranged on the top surface and the bottom surface of the third connecting sleeve, through holes are arranged in the vertical direction at the ends of the upper chord rod and the lower chord rod for connecting the middle chord rod, the bolt holes and the through holes are fixed by the third connecting bolt, the fastening assembly is connected to one end of the third connecting sleeve away from the upper chord rod and the lower chord rod, the fastening assembly includes two fastening plates arranged oppositely and at intervals and a fastening shaft passing through the two fastening plates for detachably connecting the lifting shaft; The lifting shaft includes a connecting plate, a lifting shaft body connected to one side of the connecting plate and a sling connected to one end of the shaft. The lifting shaft body can be rotatably connected to the first guide ring and the second guide ring. The connecting plate is provided with two slot holes in the vertical direction. The slot holes are inserted into the two fastening plates. The two fastening plates drive the upper chord and the lower chord to slide along the slot holes and are fixed by the fastening shaft to adapt to the end cantilever adjustable beams of different heights; the first transverse connecting plate is respectively connected to the first connecting sleeve surface and its corresponding third connecting sleeve surface on both sides, and the second transverse connecting plate is respectively connected to the second connecting sleeve surface and its corresponding third connecting sleeve surface on both sides.

[0010] Preferably, the middle chord includes a first sliding groove arranged along its length direction, and the two ends of the adjustable web slide in the first sliding groove; the upper chord includes a second sliding groove arranged along its length direction, and one end of the adjustable web slides in the second sliding groove; the lower chord includes a third sliding groove arranged along its length direction, and the other end of the adjustable web slides in the third sliding groove.

[0011] Preferably, the fixed pulley group includes a first fixed pulley and a second fixed pulley arranged at an interval, and along the length direction of the middle chord rod, the first fixed pulley is arranged on a side of the second fixed pulley away from the center of the middle chord rod, and along the vertical direction, the first fixed pulley is higher than the second fixed pulley.

[0012] Preferably, each of the adjustable belly bars comprises a telescopic sleeve, two telescopic rods, two connecting sleeves and two articulated ball joints. The two telescopic rods are respectively threadedly connected to the two ends of the telescopic sleeve to adjust the length of the adjustable belly bar. One end of each connecting sleeve is rotatably connected to one end of each telescopic rod away from the telescopic sleeve, and the other end of each connecting sleeve is threadedly connected to each articulated ball joint.

[0013] Preferably, it also includes a plurality of connecting sliding blocks, each of the connecting sliding blocks includes two ball joint holes spaced apart on its surface and a fastening hole located between the two ball joint holes, each of the connecting sliding blocks is respectively slidably connected to the first sliding groove, the second sliding groove and the third sliding groove, and is fixed to the first sliding groove, the second sliding groove and the third sliding groove by a fastening bolt passing through the fastening hole, and the ball joint of the articulated spherical joint is used for rotatably installing the ball joint.

[0014] Preferably, the support system includes multiple supporting main beams, multiple vertical poles, multiple upper supporting beams, cast-in-place slab formwork, working platforms and enclosures, the multiple supporting main beams are erected on multiple groups of end cantilever adjustable beams, the multiple vertical poles are arranged on the multiple main beams in the vertical direction, the multiple upper supporting beams are erected on the multiple vertical poles, the cast-in-place slab formwork is erected on the top of the multiple upper supporting beams, and the working platform and enclosure are arranged at one end of the upper chord away from the middle chord.

[0015] The present invention also provides an operation method of a cast-in-place formwork support system for a steel-concrete composite beam, based on any one of the cast-in-place formwork support systems for a steel-concrete composite beam, comprising the following steps:

[0016] S1. Install the middle support adjustable beam in the inverted trapezoidal cavity of the steel box room, specifically:

[0017] At least two pairs of reserved holes are correspondingly provided on the two webs of the inverted trapezoidal cavity of the steel box room, and the middle chord rods of the plurality of middle supporting adjustable beams are respectively introduced into the plurality of pairs of reserved holes, and the distance between the adjustable web rods between the two middle chord rods is adjusted according to the distance of the reserved holes;

[0018] S2. Assemble the end cantilever adjustable beam on the ground, specifically:

[0019] Adjust the distance between the upper chord and the lower chord and the length of the adjustable belly bar according to the preset distance between the two middle chord bars, and install the adjustable belly bar between each pair of middle chord bars;

[0020] S3, lift the end cantilever adjustable beam and connect it with the middle support adjustable beam, specifically:

[0021] Lift the end cantilever adjustable beam until the upper chord and the lower chord are connected to the middle chord respectively;

[0022] S4. Install the support system, specifically:

[0023] Installing a support system on the center chord of the end cantilever adjustable beam;

[0024] S5. Casting of concrete panels and curing, specifically:

[0025] Tie steel bars, set up formwork, pour concrete and perform maintenance in the inverted trapezoidal cavity of the steel box room and on the support system;

[0026] S6. Dismantle the support system, specifically:

[0027] The support system is removed after the concrete panel reaches demoulding strength;

[0028] S7. Remove the end cantilever adjustable beam and the middle support adjustable beam, specifically:

[0029] The end cantilever adjustable beam is dismantled as a whole and dropped to the ground for recovery, and the adjustable web member and center chord member of the middle supporting adjustable beam are dismantled in turn.

[0030] The beneficial effects of the present invention are:

[0031] The cast-in-place formwork support system for the steel-concrete composite beam erected by the present invention is installed as a whole on the bridge piers. Compared with the full-frame support casting method, there is no need to start the erection from under the bridge piers, which saves a large amount of support materials and can also be suitable for the construction of bridges with higher heights. Compared with the welding cantilever hanging basket casting method, the present invention adopts a method of opening a preset hole on the inverted trapezoidal cavity and inserting the middle support adjustable beam, and then detachably connecting the end cantilever adjustable beams on both sides of the middle support adjustable beam to build a support system to support the concrete panel that needs to be cast subsequently, avoiding high-altitude welding of the formwork support and reducing the construction impact on the steel box room. The detachable connection method can also remove the double cantilever adjustable beam in the later stage and reuse it, which has good economy and greatly improved safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the installation of the present invention;

[0033] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0034] Figure 3 It is a schematic diagram of the double cantilever adjustable beam structure;

[0035] Figure 4 It is a schematic diagram of the structure of the middle support adjustable beam;

[0036] Figure 5 This is the exploded view of the middle support adjustable beam;

[0037] Figure 6 It is a schematic diagram of the end cantilever adjustable beam structure;

[0038] Figure 7 The exploded diagram of the end cantilever adjustable beam;

[0039] Figure 8 Schematic diagram of the structure of the first transverse connecting plate and the second transverse connecting plate;

[0040] Fig. 9 It is the schematic diagram of the middle chord structure;

[0041] Fig.10 It is a schematic diagram of the structure of the upper chord and the lower chord;

[0042] Fig.11 It is a schematic diagram of the adjustable belly rod structure;

[0043] Fig.12 It is a schematic diagram of the structure of the upper connecting device and the lower connecting device;

[0044] Fig.13 It is a schematic diagram of the lifting shaft structure;

[0045] Fig.14 is a schematic diagram of the structure of the edge connection device;

[0046] Fig.15 Schematic diagram of the structure of the connected sliding block.

[0047] Markings in the figure: 1. Double cantilever adjustable beam;

[0048] 11. Middle support adjustable beam; 111. Middle chord; 112. Adjustable web; 113. Upper connecting device; 114. Lower connecting device; 115. Connecting sliding block; 1111. First sliding groove; 1112. First connecting hole; 1121. Telescopic sleeve; 1122. Telescopic rod; 1123. Connecting sleeve; 1124. Articulated ball joint; 1131. First connecting sleeve; 1132. First fixed pulley; 1133. Second fixed pulley; 1134. First guide ring; 1135. First groove; 1136. First connecting bolt; 1143. Second groove; 1144. Second connecting bolt; 1141. Second connecting sleeve; 1142. Second guide ring; 1151. Ball hinge hole; 1152. Fastening bolt;

[0049] 12. adjustable end cantilever beam; 121. lifting shaft; 122. upper chord; 123. lower chord; 124. side connection device; 1211. connection plate; 1212. lifting shaft; 1213. sling; 1214. slotted hole; 1221. second sliding groove; 1222. second connecting hole; 1231. third sliding groove; 1232. third connecting hole; 1241. third connecting sleeve; 1242. fastening plate; 1243. fastening shaft; 1244. third connecting bolt;

[0050] 13. A first transverse connecting plate;

[0051] 14. Second transverse connecting plate;

[0052] 2. Support system;

[0053] 21. Supporting main beam; 22. Vertical pole; 23. Upper supporting beam; 24. Cast-in-place slab formwork; 25. Working platform and enclosure;

[0054] 3. Steel box room;

[0055] 4. Bridge pier.

[0056] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0058] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0060] like Figure 1-Figure 15 As shown, this embodiment provides a cast-in-place formwork support system 2 for steel-concrete composite beams, comprising: a support system 2 installed on a bridge pier 4, a steel box chamber 3 is provided on the bridge pier 4, the steel box chamber 3 has an inverted trapezoidal cavity for pouring concrete, at least two pairs of reserved holes are correspondingly provided on the two webs of the inverted trapezoidal cavity, and the connecting line between the centers of each pair of reserved holes extends in the horizontal direction and is parallel to each other; a support system 2 for supporting the steel box chamber 3, the two webs are placed on the support system 2; and a plurality of groups of double cantilever adjustable beams 1, each group of double cantilever adjustable beams 1 comprises a middle support adjustable beam 11 and two end cantilever adjustable beams 12 respectively detachably connected to the two ends of the middle support adjustable beam 11, each middle support adjustable beam 11 respectively passes through each pair of reserved holes, and the two end cantilever adjustable beams 12 are used to support the support system 2, and the support system 2 is installed on the plurality of groups of end cantilever adjustable beams 12.

[0061] The cast-in-place formwork support system 2 of the steel-concrete composite beam erected in this embodiment is installed as a whole on the pier 4. Compared with the full-frame support casting method, there is no need to start the erection from under the pier 4 of the bridge, which saves a lot of support materials and can also be suitable for the construction of bridges with higher heights. Compared with the welding cantilever hanging basket casting method, this embodiment adopts a method of opening a preset hole on the inverted trapezoidal cavity and inserting the middle support adjustable beam 11, and then detachably connecting the end cantilever adjustable beams 12 on both sides of the middle support adjustable beam 11 to build the support system 2 to support the concrete panel to be cast subsequently, avoiding high-altitude welding of the formwork support and reducing the construction impact on the steel box chamber 3. The detachable connection method can also remove the double cantilever adjustable beam 1 in the later stage and reuse it, which has good economy and greatly improved safety performance.

[0062] Please continue to refer to Figure 3-Figure 8 As shown, the middle supporting adjustable beam 11 includes two middle chords 111 and a plurality of adjustable webs 112, each middle chord 111 passes through each pair of reserved holes, and the plurality of adjustable webs 112 are slidably connected between the two middle chords 111 to adapt to the preset distance between the two middle chords 111; each end cantilever adjustable beam 12 includes two upper chords 122, two lower chords 123 and a plurality of adjustable webs 112, the distance between the two pairs of upper chords 122 and lower chords 123 is the same as the distance between the two middle chords 111, and the plurality of adjustable webs 112 are slidably connected between each pair of upper chords 122 and lower chords 123 to adapt to the preset distance between the upper chords 122 and lower chords 123; the two pairs of upper chords 122 and lower chords 123 are detachably connected to the four ends of the middle chord 111 in the length direction, forming two parallel rod-like structures extending along the surface direction of the pier 4. During installation, each center chord rod 111 can pass through the reserved holes relatively arranged on the two opposite webs of the inverted trapezoidal cavity. Therefore, the distance between each pair of upper and lower center chord rods 111 in the vertical direction is preset. The distance varies according to the different positions of the reserved holes of different steel box chambers 3. However, the distance between the center chord rods 111 and the distance between the upper chord rods 122 and the lower chord rods 123 can be changed and fixed by the length of the adjustable web rods 112. Therefore, it can not only be repeatedly dismantled and recycled, but also can be applicable to different steel box chambers 3, and has strong versatility.

[0063] Please continue to refer to Figure 3-Figure 7 As shown, this embodiment also includes a connection system; the connection system includes: two upper connection devices 113, two lower connection devices 114, four side connection devices 124, two lifting shafts 121, two first transverse connection plates 13 and two second transverse connection plates 14; each upper connection device 113 and each lower connection device 114 are respectively detachably connected to the two upper ends and the two lower ends of the middle chord rod 111, the four side connection devices 124 are connected to the upper chord rod 122 and the lower chord rod 123 corresponding to the upper ends and the lower ends of the middle chord rod 111, and the two lifting shafts 121 are respectively rotatably connected between the upper connection device 113 and the side connection device 124 and the lower connection device 114 and the side connection device 124; the two first connection plates are used to transversely connect the two upper chord rods 122 and their corresponding middle chord rods 111, and the two second connection plates are used to transversely connect the two lower chord rods 123 and their corresponding middle chord rods 111. In this embodiment, the middle chord 111, the upper chord 122 and the lower chord 123 constituting the double cantilever adjustable beam 1 are connected by a connection system, and the entire connection system is detachable. Therefore, the double cantilever adjustable beam 1 is detachable and reusable.

[0064] Please continue to refer to Figure 12-14As shown, each upper connecting device 113 includes: a first connecting sleeve 1131, a first connecting bolt 1136, a fixed pulley set and a first guide ring 1134, each first connecting sleeve 1131 is respectively inserted into the two ends of the middle chord rod 111 located above, the bottom surface of the first connecting sleeve 1131 is provided with a through first groove 1135 for one end of the middle chord rod 111 to slide therein, the top surface of the first connecting sleeve 1131 is provided with a plurality of connecting bolt holes, the middle chord rod 111 located above is provided with a plurality of first connecting holes 1112, the plurality of connecting bolt holes and the plurality of first connecting holes 1112 are fixed by the first connecting bolts 1136, and the fixed pulley set 1134 is provided with a plurality of first connecting holes 1112. The pulley block is arranged on the top surface of the first connecting sleeve 1131 to change the force direction of the lifting rope 1213 of the end cantilever adjustable beam 12. The first guide ring 1134 is arranged on the side of the first connecting sleeve 1131 away from the middle chord rod 111 to rotatably connect the lifting shaft 121. Each lower connecting device 114 includes a second connecting sleeve 1141, a second connecting bolt 1144 and a second guide ring 1142. Each second connecting sleeve 1141 is respectively inserted into the two ends of the middle chord rod 111 located below. The top surface of the second connecting sleeve 1141 is provided with a through second groove 1141 for the other end of the middle chord rod 111 to slide therein. 3. A plurality of connecting bolt holes are arranged on the bottom surface of the second connecting sleeve 1141, and a plurality of first connecting holes 1112 are arranged correspondingly on the middle chord rod 111 located below. The plurality of connecting bolt holes and the plurality of first connecting holes 1112 are fixed by second connecting bolts 1144. A second guide ring 1142 is arranged on a side of the second connecting sleeve 1141 away from the middle chord rod 111, and is used to rotatably connect the lifting shaft 121. Each side connecting device 124 includes a third connecting sleeve 1241, a fastening assembly and a third connecting bolt 1244. Each third connecting sleeve 1241 is formed with a third connecting bolt 1244 for connecting the upper chord rod 122 and the lower chord rod 123 to the middle chord rod 111. The third groove of the end of the third connecting sleeve 1241 is formed inside, and a plurality of bolt holes are correspondingly arranged on the top and bottom surfaces of the third connecting sleeve 1241. The ends of the upper chord rod 122 and the lower chord rod 123 are used to connect the middle chord rod 111, and through holes are arranged in the vertical direction. The bolt holes and the through holes are fixed by third connecting bolts 1244. The fastening assembly is connected to the end of the third connecting sleeve 1241 away from the upper chord rod 122 and the lower chord rod 123. The fastening assembly includes two fastening sheets 1242 that are opposite and spaced apart and a fastening shaft 1243 that penetrates the two fastening sheets 1242, which are used to detachably connect the lifting shaft 121;The lifting shaft 121 includes a connecting piece 1211, a lifting shaft 121 body connected to one side of the connecting piece 1211 and a sling 1213 connected to one end of the shaft. The lifting shaft 121 body can be rotatably connected to the first guide ring 1134 and the second guide ring 1142. The connecting piece 1211 is provided with two slot holes 1214 in the vertical direction. The slot holes 1214 are inserted into two fastening pieces 1242. The two fastening pieces 1242 drive the upper chord rod 122 and the lower chord rod 123 to slide along the slot holes 1214 and are fixed by the fastening shaft 1243 to adapt to the end cantilever adjustable beam 12 of different heights; the first transverse connecting plate 13 is connected to the surface of the first connecting sleeve 1131 and the corresponding surface of the third connecting sleeve 1241 on both sides, and the second transverse connecting plate 14 is connected to the surface of the second connecting sleeve 1141 and the corresponding surface of the third connecting sleeve 1241 on both sides. Thus, the upper connecting device 113 and the lower connecting device 114 are fixedly connected to the upper end and the lower end of the middle chord rod 111 respectively, and the first guide ring 1134 and the second guide ring 1142 are set on the side of the two away from the middle chord rod 111. The side connecting device 124 is fixedly connected to the upper chord rod 122 and the lower chord rod 123 for connecting one end of the middle chord rod 111. The side connecting device 124 also slides along the groove hole 1214 of the connecting plate 1211 of the lifting shaft 121 through the fastening plate 1242 set thereon. According to the preset distance between the upper chord rod 122 and the lower chord rod 123, after adjusting to a suitable position, it is fixed by the fastening shaft 1243, and then the lifting shaft 121 body is inserted into the second guide ring 1142 and the first guide ring 113 from bottom to top in sequence under the action of the top sling 1213. 4. After the hoisting is completed, the inner diameter R1 of the second guide ring 1142 and the first guide ring 1134 is larger than the outer diameter R2 of the lifting shaft 121, and 0.95R1<R2<R1, so that the lifting shaft 121 can move along the axial direction of the second guide ring 1142 and the first guide ring 1134, and is constrained in the horizontal direction. After the connection is completed, in order to further fix, the middle chord rod 111 and the upper chord rod 122 and the middle chord rod 111 and the lower chord rod 123 are finally fixed by the first transverse connecting plate 13 and the second transverse connecting plate 14 to prevent the lifting shaft 121 from falling off from the second guide ring 1142 and the first guide ring 1134 after the hoisting due to the outer diameter R2 of the lifting shaft 121 being slightly smaller than the inner diameter R1 of the second guide ring 1142 and the first guide ring 1134. ;

[0065] Please continue to refer to Figure 9-10As shown, the middle chord 111 includes a first sliding groove 1111 arranged along its length direction, and both ends of the adjustable web member 112 slide in the first sliding groove 1111; the upper chord 122 includes a second sliding groove 1221 arranged along its length direction, and one end of the adjustable web member 112 slides in the second sliding groove 1221; the lower chord 123 includes a third sliding groove 1231 arranged along its length direction, and the other end of the adjustable web member 112 slides in the third sliding groove 1231. The adjustable web member 112 adjusts its length by sliding in the third sliding groove to adapt to the distance between the upper and lower middle chords 111 and the distance between the corresponding upper chord 122 and lower chord 123.

[0066] Please continue to refer to Fig.12 As shown, the fixed pulley block includes a first fixed pulley 1132 and a second fixed pulley 1133 arranged at intervals. Along the length direction of the middle chord rod 111, the first fixed pulley 1132 is arranged on a side of the second fixed pulley 1133 away from the center of the middle chord rod 111. In the vertical direction, the first fixed pulley 1132 is higher than the second fixed pulley 1133. The arrangement of each fixed pulley block facilitates the construction and installation, and changes the lifting force of the sling 1213 from the vertical direction to the horizontal direction, and stably hoists the end cantilever adjustable beam 12 through the sling 1213 in the inverted trapezoidal cavity.

[0067] Please continue to refer to Fig.11 As shown, each adjustable web 112 includes a telescopic sleeve 1121, two telescopic rods 1122, two connecting sleeves 1123 and two articulated ball joints 1124. The two telescopic rods 1122 are respectively threadedly connected to the two ends of the telescopic sleeve 1121 to adjust the length of the adjustable web 112. One end of each connecting sleeve 1123 is rotatably connected to one end of each telescopic rod 1122 away from the telescopic sleeve 1121, and the other end of each connecting sleeve 1123 is threadedly connected to each articulated ball joint 1124. The length of the adjustable web 112 is achieved by rotating two telescopic rods 1122 in and out of the telescopic sleeve 1121. The telescopic rods 1122 at both ends are threadedly connected to the articulated ball joint 1124 through the connecting sleeve 1123, so that the articulated ball joint 1124 can slide in the first sliding groove 1111, the second sliding groove 1221, and the third sliding groove 1231, driving the telescopic rod 1122 to rotate in and out of the telescopic sleeve 1121, so as to adapt to the distance between the upper and lower middle chord rods 111 and the corresponding upper chord rod 122 and lower chord rod 123.

[0068] Please continue to refer to Fig.15As shown, it also includes a plurality of connecting sliding blocks 115, each connecting sliding block 115 includes two ball joint holes 1151 spaced apart on its surface and a fastening hole located between the two ball joint holes 1151, each connecting sliding block 115 is respectively slidably connected in the first sliding groove 1111, the second sliding groove 1221 and the third sliding groove 1231, and is fixed in the first sliding groove 1111, the second sliding groove 1221 and the third sliding groove 1231 by a fastening bolt 1152 passing through the fastening hole, and the ball joint in the ball joint hole 1151 is used for rotatably installing the ball joint of the articulated spherical joint 1124. When the connecting sliding block 115 is installed in the first sliding groove 1111, the second sliding groove 1221 and the third sliding groove 1231 and slides to a suitable position, it is fixed by passing the fastening bolt 1152 through the fastening hole, and then the length of the adjustable web rod 112 is adjusted by rotating the articulated spherical joint 1124 in the ball hinge hole 1151 to adapt to the distance between the upper and lower middle chord rods 111 and the corresponding upper chord rod 122 and lower chord rod 123.

[0069] Please continue to refer to Figure 2 As shown, the support system 2 includes multiple supporting main beams 21, multiple vertical poles 22, multiple upper supporting beams 23, cast-in-place slab formwork 24, a working platform and a fence. The multiple supporting main beams 21 extend in the horizontal direction and are erected on multiple groups of end cantilever adjustable beams 12. The multiple vertical poles 22 extend in the vertical direction and are arranged on the multiple main beams. The multiple upper supporting beams 23 extend in the horizontal direction and are erected on the multiple vertical poles 22. The cast-in-place slab formwork 24 is erected on the top of the multiple upper supporting beams 23. The working platform and the fence are arranged at one end of the upper chord 122 away from the middle chord 111 to form a concrete pouring platform.

[0070] This embodiment also provides an operation method of a cast-in-place formwork support system 2 for steel-concrete composite beams, based on any of the above cast-in-place formwork support systems 2 for steel-concrete composite beams, comprising the following steps:

[0071] S1. Install the middle support adjustable beam 11 in the inverted trapezoidal cavity of the steel box chamber 3, specifically: open at least two pairs of reserved holes corresponding to the two webs of the inverted trapezoidal cavity of the steel box chamber 3, introduce the middle chord rods 111 of multiple middle support adjustable beams 11 into the multiple pairs of reserved holes respectively, and adjust the distance between the adjustable web rods 112 between the two middle chord rods 111 according to the distance of the reserved holes; more specifically, the middle support adjustable beam 11 can be installed before or after the steel box chamber 3 is hoisted; introduce the components of the middle support adjustable beam 11, the upper connecting device 113, the lower connecting device 114 and the sling 111 into the reserved holes on the top of the steel box chamber 3 or the reserved holes on the end transverse partitions. 213; a connecting sliding block 115 is installed inside the middle chord rod 111, which slides to a suitable position in the first sliding groove 1111 and tightens the fastening bolts 1152 to fix the position of the connecting sliding block 115, and upper connecting devices 113 are respectively installed at both ends of the upper middle chord rod 111, and lower connecting devices 114 are respectively connected to both ends of the lower middle chord rod 111, and then the middle chord rod 111 is inserted into the reserved hole of the steel box chamber 3, and then the length of the adjustable web rod 112 between the middle supporting adjustable beams 11 is adjusted according to the height of the upper and lower reserved holes of the steel box chamber 3, and the adjustable web rod 112 is connected to the connecting sliding block 115 of the pre-installed articulated ball joint 1124.

[0072] S2. Assemble the end cantilever adjustable beam 12 on the ground, specifically: adjust the distance between the upper chord 122 and the lower chord 123 and the length of the adjustable web 112 according to the preset distance between the two middle chords 111, and install the adjustable web 112 between each pair of middle chords 111; more specifically, install the connecting sliding blocks 115 pre-installed with the articulated ball joints 1124 in the upper chord 122 and the lower chord 123, each connecting sliding block 115 slides to a suitable position in the second sliding groove 1221 and the third sliding groove 1231 and is tightened with the fixing bolts 1152, and the adjustable web 112 is installed between each pair of middle chords 111; more specifically, install the connecting sliding blocks 115 pre-installed with the articulated ball joints 1124 in the upper chord 122 and the lower chord 123, and each connecting sliding block 115 slides to a suitable position in the second sliding groove 1221 and the third sliding groove 1231 and is fixed by tightening the fixing bolts 1152, and the adjustable web 112 is installed between each pair of middle chords 111; Adjust the length of the adjustable web 112 to ensure that the height of the end cantilever adjustable beam 12 is consistent with that of the middle support adjustable beam 11, install the adjustable web 112 to the connecting sliding block 115, install the side connecting device 124 at each end of the end cantilever adjustable beam 12 facing the middle support adjustable beam 11, connect the two slotted holes 1214 of the lifting shaft 121 to the side connecting device 124 through the fastening plate 1242 and the fastening shaft 1243, adjust the angle between the lifting shaft 121 and the first transverse connecting plate 13 and the second transverse connecting plate 14 to be vertical, and fix the angle by screwing the fastening shaft 1243.

[0073] S3, lift the end cantilever adjustable beam 12 and connect it with the middle support adjustable beam 11, specifically: lift the end cantilever adjustable beam 12 until the upper chord 122 and the lower chord 123 are respectively connected to the middle chord 111; more specifically, lower one end of the sling 1213 from the inside of the steel box chamber 3 to connect it to the hemispherical top of the lifting shaft 121, pull up the sling 1213 inside the steel box chamber 3 so that the hemispherical top of the lifting shaft 121 contacts the second guide ring 1142 of the lower connecting device 114, pull up the sling 1213, and lift the shaft 121 first The horizontal suspension angle of the end cantilever adjustable beam 12 can be corrected by passing through the second guide ring 1142, and the vertical angle of the end cantilever adjustable beam can be corrected by continuing to pull up the sling 1213 through the first guide ring 1134; after lifting to a suitable height, the first transverse connecting plate 13 and the second transverse connecting plate 14 are respectively installed on the surfaces of the upper connecting device 113 and the lower connecting device 114, and the first transverse connecting plate 13 and the second transverse connecting plate 14 are fixed to the corresponding surface of the side connecting device 124 to fix the end cantilever adjustable beam 12.

[0074] It should be noted that when there are multiple sets of double cantilever adjustable beams 1 arranged at intervals, it is necessary to repeat steps S1 to S3 to continue to erect the middle supporting adjustable beam 11 along the longitudinal direction of the bridge, and to fix and install the end cantilever adjustable beam 12.

[0075] S4, installing the support system 2, specifically: installing the support system 2 on the middle chord 111 of the end cantilever adjustable beam 12; more specifically, the end cantilever adjustable beam 12 provides support for the installation of the support system 2, and the working platform and enclosure, supporting main beam 21, vertical pole 22, upper support beam 23 and cast-in-place formwork are installed in sequence.

[0076] S5, pouring concrete panels and curing, specifically: tying steel bars, setting up formwork, pouring concrete and curing in the inverted trapezoidal cavity of the steel box chamber 3 and on the cast-in-place formwork 34 of the support system 2.

[0077] S6, dismantling the support system 2, specifically: after the concrete panel reaches the demoulding strength, dismantling the support system 2 in the reverse order of the installation sequence in S4.

[0078] S7. Dismantle the end cantilever adjustable beam 12 and the middle support adjustable beam 11, specifically: dismantle the end cantilever adjustable beam 12 as a whole and lower it to the ground for recovery, and dismantle the adjustable web 112 and the middle chord 111 of the middle support adjustable beam 11 in sequence; more specifically, dismantle the first transverse connecting plate 13 and the second transverse connecting plate 14, control the sling 1213 to slowly lower the end cantilever adjustable beam 12 to the ground for recovery, first dismantle the adjustable web 112 of the middle support adjustable beam 11, and then dismantle the two middle chords 111, and then complete the dismantling of the middle support adjustable beam 11.

[0079] Therefore, this embodiment is not limited by the height of the bridge erection during the pouring of the concrete panel of the steel-concrete composite beam. The casting of box beams of different heights can be achieved by adjusting the length of the adjustable web. The double-cantilever adjustable beam supported by the cast-in-place formwork of the steel-concrete composite beam can be recycled, saving materials and having good economy. It avoids high-altitude welding of the formwork support and reduces the construction impact on the steel box room.

[0080] The above examples of the present invention are described in detail, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A cast-in-place formwork support system for steel-concrete composite beams, characterized in that: Installed on a bridge pier, the bridge pier is provided with a steel box chamber, the steel box chamber has an inverted trapezoidal cavity for pouring concrete, two webs of the inverted trapezoidal cavity are provided with at least two pairs of reserved holes, and the connecting line between the centers of each pair of the reserved holes extends in the horizontal direction and is parallel to each other; The cast-in-place formwork support system for steel-concrete composite beams comprises: a support system for supporting the steel box chamber, the two webs being placed on the support system; and A plurality of groups of double cantilever adjustable beams, each group of the double cantilever adjustable beams comprises a middle support adjustable beam and two end cantilever adjustable beams detachably connected to the two ends of the middle support adjustable beam, each of the middle support adjustable beams passes through each pair of the reserved holes, the two end cantilever adjustable beams are used to support the support system, and the support system is installed on the plurality of groups of the end cantilever adjustable beams.

2. A cast-in-place formwork support system for steel-concrete composite beams as claimed in claim 1, characterized in that: The middle support adjustable beam comprises two middle chord rods and a plurality of adjustable web rods, each of the middle chord rods respectively passes through each pair of the reserved holes, and the plurality of adjustable web rods are slidably connected between the two middle chord rods to adapt to a preset distance between the two middle chord rods; Each of the end cantilever adjustable beams comprises two upper chords, two lower chords and a plurality of adjustable web members, the distance between the two pairs of the upper chords and the lower chords being the same as the distance between the two middle chords, and the plurality of adjustable web members being slidably connected between each pair of the upper chords and the lower chords to adapt to a preset distance between the upper chords and the lower chords; The two pairs of upper chords and lower chords are detachably connected to the four ends of the middle chord in the length direction, respectively, to form two parallel rod-like structures extending along the surface direction of the pier.

3. A cast-in-place formwork support system for steel-concrete composite beams as claimed in claim 2, characterized in that: Also includes connection system; The connection system comprises: two upper connection devices, two lower connection devices, four side connection devices, two lifting shafts, two first transverse connection plates and two second transverse connection plates; Each of the upper connecting devices and each of the lower connecting devices are detachably connected to the two upper ends and the two lower ends of the middle chord rod, the four side connecting devices are connected to the upper chord rod and the lower chord rod and are correspondingly connected to the upper ends and the lower ends of the middle chord rod, and the two lifting shafts are rotatably connected between the upper connecting device and the side connecting device and between the lower connecting device and the side connecting device; The two first connecting plates are used to transversely connect the two upper chords and the corresponding middle chords, and the two second connecting plates are used to transversely connect the two lower chords and the corresponding middle chords.

4. A cast-in-place formwork support system for steel-concrete composite beams as claimed in claim 3, characterized in that: Each of the upper connecting devices comprises: a first connecting sleeve, a first connecting bolt, a fixed pulley group and a first guide ring, each of the first connecting sleeves is respectively inserted into the two ends of the middle chord rod located at the top, the bottom surface of the first connecting sleeve is provided with a through first groove for one end of the middle chord rod to slide therein, the top surface of the first connecting sleeve is provided with a plurality of connecting bolt holes, the middle chord rod located at the top is provided with a plurality of first connecting holes, the plurality of connecting bolt holes and the plurality of first connecting holes are fixed by the first connecting bolts, the fixed pulley group is provided on the top surface of the first connecting sleeve to change the force direction of the end cantilever adjustable beam lifting sling, the first guide ring is provided on the side of the first connecting sleeve away from the middle chord rod to be rotatably connected to the lifting shaft; Each of the lower connecting devices comprises a second connecting sleeve, a second connecting bolt and a second guide ring, each of the second connecting sleeves is respectively inserted into the two ends of the middle chord rod located below, the top surface of the second connecting sleeve is provided with a through second groove for the other end of the middle chord rod to slide therein, the bottom surface of the second connecting sleeve is provided with a plurality of connecting bolt holes, the middle chord rod located below is correspondingly provided with a plurality of first connecting holes, the plurality of connecting bolt holes and the plurality of first connecting holes are fixed by the second connecting bolts, and the second guide ring is provided on the side of the second connecting sleeve away from the middle chord rod, so as to be rotatably connected to the lifting shaft; Each of the side connection devices includes a third connection sleeve, a fastening assembly and a third connection bolt. A third groove is formed in each of the third connection sleeves for the ends of the upper chord rod and the lower chord rod to be inserted into for connecting the middle chord rod. The third connection sleeve is formed inside, and a plurality of bolt holes are correspondingly arranged on the top and bottom surfaces of the third connection sleeve. Through holes are arranged in the vertical direction on the ends of the upper chord rod and the lower chord rod for connecting the middle chord rod. The bolt holes and the through holes are fixed by the third connection bolts. The fastening assembly is connected to one end of the third connection sleeve away from the upper chord rod and the lower chord rod. The fastening assembly includes two fastening plates that are opposite and spaced apart and a fastening shaft that passes through the two fastening plates for detachably connecting the lifting shaft. The lifting shaft comprises a connecting piece, a lifting shaft body connected to one side of the connecting piece, and a sling connected to one end of the shaft lifting, the lifting shaft body is rotatably connected to the first guide ring and the second guide ring, the connecting piece is provided with two slot holes along the vertical direction, the slot holes are inserted into the two fastening pieces, the two fastening pieces drive the upper chord rod and the lower chord rod to slide along the slot holes, and are fixed by the fastening shaft, so as to adapt to the end cantilever adjustable beams of different heights; The first transverse connecting plate has two sides respectively connected to the first connecting sleeve surface and its corresponding third connecting sleeve surface, and the second transverse connecting plate has two sides respectively connected to the second connecting sleeve surface and its corresponding third connecting sleeve surface.

5. A cast-in-place formwork support system for steel-concrete composite beams as claimed in claim 4, characterized in that: The middle chord includes a first sliding groove arranged along the length direction thereof, and the two ends of the adjustable web slide in the first sliding groove; The upper chord includes a second sliding groove arranged along the length direction thereof, and one end of the adjustable web slides in the second sliding groove; The lower chord comprises a third sliding groove arranged along the length direction thereof, and the other end of the adjustable web member slides in the third sliding groove.

6. A cast-in-place formwork support system for steel-concrete composite beams as claimed in claim 4, characterized in that: The fixed pulley assembly comprises a first fixed pulley and a second fixed pulley arranged at an interval. Along the length direction of the middle chord rod, the first fixed pulley is arranged on a side of the second fixed pulley away from the center of the middle chord rod. Along the vertical direction, the first fixed pulley is higher than the second fixed pulley.

7. A cast-in-place formwork support system for steel-concrete composite beams as claimed in claim 4, characterized in that: Each of the adjustable belly bars comprises a telescopic sleeve, two telescopic rods, two connecting sleeves and two articulated ball joints. The two telescopic rods are respectively threadedly connected to the two ends of the telescopic sleeve to adjust the length of the adjustable belly bar. One end of each connecting sleeve is rotatably connected to the end of each telescopic rod away from the telescopic sleeve, and the other end of each connecting sleeve is threadedly connected to each articulated ball joint.

8. A cast-in-place formwork support system for steel-concrete composite beams as claimed in claim 7, characterized in that: It also includes multiple connecting sliding blocks, each of which includes two ball joint holes spaced apart on its surface and a fastening hole located between the two ball joint holes, each of which is slidably connected to the first sliding groove, the second sliding groove and the third sliding groove, and is fixed to the first sliding groove, the second sliding groove and the third sliding groove by a fastening bolt passing through the fastening hole, and the ball joint of the articulated spherical joint is used for rotatably installing the ball joint.

9. A cast-in-place formwork support system for steel-concrete composite beams as claimed in claim 2, characterized in that: The support system includes multiple supporting main beams, multiple vertical poles, multiple upper supporting beams, cast-in-place slab formwork, working platforms and enclosures. The multiple supporting main beams are erected on multiple groups of end cantilever adjustable beams. The multiple vertical poles are arranged on the multiple main beams in the vertical direction. The multiple upper supporting beams are erected on the multiple vertical poles. The cast-in-place slab formwork is erected on the top of the multiple upper supporting beams. The working platform and enclosure are arranged on one end of the upper chord away from the middle chord.

10. An operating method of a cast-in-place formwork support system for a steel-concrete composite beam, based on the cast-in-place formwork support system for a steel-concrete composite beam according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Install the middle support adjustable beam in the inverted trapezoidal cavity of the steel box room, specifically: At least two pairs of reserved holes are correspondingly provided on the two webs of the inverted trapezoidal cavity of the steel box room, and the middle chord rods of the plurality of middle supporting adjustable beams are respectively introduced into the plurality of pairs of reserved holes, and the distance between the adjustable web rods between the two middle chord rods is adjusted according to the distance of the reserved holes; S2. Assemble the end cantilever adjustable beam on the ground, specifically: Adjust the distance between the upper chord and the lower chord and the length of the adjustable belly bar according to the preset distance between the two middle chord bars, and install the adjustable belly bar between each pair of middle chord bars; S3, lift the end cantilever adjustable beam and connect it with the middle support adjustable beam, specifically: Lift the end cantilever adjustable beam until the upper chord and the lower chord are connected to the middle chord respectively; S4. Install the support system, specifically: Installing a support system on the center chord of the end cantilever adjustable beam; S5. Casting of concrete panels and curing, specifically: Tie steel bars, set up formwork, pour concrete and perform maintenance in the inverted trapezoidal cavity of the steel box room and on the support system; S6. Dismantle the support system, specifically: The support system is removed after the concrete panel reaches demoulding strength; S7. Remove the end cantilever adjustable beam and the middle support adjustable beam, specifically: The end cantilever adjustable beam is dismantled as a whole and dropped to the ground for recovery, and the adjustable web member and center chord member of the middle supporting adjustable beam are dismantled in turn.

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