Detachable formwork-erecting-free assembly type reinforced concrete roof truss structure

Abstract

The utility model discloses a detachable formwork-free assembly type reinforced concrete roof truss structure which comprises a prefabricated cross beam and a prefabricated zigzag roof truss, oblique beam supporting blocks are arranged at the tops of the two ends of the prefabricated cross beam, the prefabricated zigzag roof truss comprises two oblique beams and oblique beam supporting columns, the tops of the two oblique beams are connected, the oblique beams are distributed in a herringbone shape, and the tops of the oblique beam supporting columns are connected with the oblique beams. The bottoms of the cant beams are connected with the corresponding cant beam supporting blocks respectively, the cant beam supporting columns are supported and fixed to the prefabricated cross beams, the number of the prefabricated cross beams is the same as that of the prefabricated cross beams, roofs are laid between the cant beams of the adjacent prefabricated zigzag roof trusses, multiple rows of prefabricated secondary beams are arranged between the adjacent prefabricated cross beams, and the cant beam supporting columns are fixed to the cant beam supporting columns. Floor plates are arranged between the adjacent prefabricated secondary beams, and the utility model further discloses a connecting mode of the prefabricated cross beams and the prefabricated zigzag roof truss and a connecting mode of the prefabricated cross beams and the prefabricated secondary beams. The utility model can be simply spliced, assembled and constructed on site after being prefabricated in a factory, so that the construction period can be shortened, and the construction cost can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to building technical field, concretely relates to a kind of dismantled exempt from formwork assembly type reinforced concrete roof truss structure. BACKGROUND

[0002] Engineering structure often uses prestressed reinforced concrete roof truss or ordinary cast-in-place reinforced concrete roof truss, as shown in Figure 1 Prestressed reinforced concrete roof truss is often difficult to transport due to large overall size, small and many sub-components (diagonal beams, horizontal rods, web members, etc.), and if precast on site, the construction process is affected by many factors, and the quality of finished products is not easy to guarantee. Full cast-in-place reinforced concrete needs to use full scaffolding high formwork, which is a dangerous project, and the construction period is long, sometimes it needs to be cast in place multiple times, which greatly affects the project schedule. SUMMARY

[0003] The utility model is directed to the above problems existing in the prior art, and provides a kind of dismantled exempt from formwork assembly type reinforced concrete roof truss structure.

[0004] The above-mentioned purpose of the utility model is achieved by the following technical means:

[0005] A kind of dismantled exempt from formwork assembly type reinforced concrete roof truss structure, including precast crossbeam and precast folded roof truss, characterized by, the top of both ends of precast crossbeam is provided with inclined beam support block, precast folded roof truss includes two top connections and is in the shape of an inverted vee distribution inclined beam, precast folded roof truss also includes the inclined beam support column that is connected with inclined beam at top, the bottom of inclined beam is connected with corresponding inclined beam support block respectively, inclined beam support column bottom is supported and fixed on precast crossbeam, precast crossbeam is multiple and is arranged in parallel, the number of precast folded roof truss is same with precast crossbeam, the inclined beam between adjacent precast folded roof truss is paved with roof, the steel bar embedded in the bottom of the end of precast crossbeam and the steel bar embedded in the top support surface of bent column are fixedly connected by steel bar connecting device, and the bottom of the end of precast crossbeam and the top of bent column are filled with slurry layer.

[0006] Multiple rows of precast secondary beams are arranged between the adjacent precast crossbeams, and floor slabs are arranged between the adjacent precast secondary beams.

[0007] The steel bar embedded in the bottom end face of the inclined beam is connected with the steel bar embedded in the support surface of the inclined beam support block by the steel bar connecting device, and the slurry layer is filled between the bottom end face of the inclined beam and the support surface of the inclined beam support block.

[0008] The bottom end face of the inclined beam is a stepped end face, and the support surface of the inclined beam support block is a stepped end face that is adapted to the shape of the bottom end face of the inclined beam.

[0009] The bottom end face of the inclined beam and the supporting face of the inclined beam supporting block are both pre-buried with I-shaped steel connecting pieces, and the pre-buried I-shaped steel connecting pieces between the bottom end face of the inclined beam and the supporting face of the inclined beam supporting block are fixedly connected.

[0010] The bottom end face of the inclined beam and the supporting face of the inclined beam supporting block are both pre-buried with welding pieces, the welding pieces comprise a pre-buried part and a welding part, and the pre-buried part and the welding part are connected; and the welding parts of the pre-buried welding pieces between the bottom end face of the inclined beam and the supporting face of the inclined beam supporting block are welded and connected.

[0011] The end part of the prefabricated secondary beam is provided with a lapping table, the top face of the prefabricated cross beam is provided with lapping grooves on both sides, the lapping table of the end part of the prefabricated secondary beam on both sides of the prefabricated cross beam is placed in the corresponding lapping groove, a plurality of end pre-buried reinforcing bars are embedded in the end part of the prefabricated secondary beam, the end pre-buried reinforcing bars are fixed by pre-buried hoop reinforcing bars, the top of each end pre-buried reinforcing bar is exposed from the end top face of the prefabricated secondary beam and fixed with the prefabricated secondary beam reinforcing bar, and a concrete composite layer is laid at the connection position of the end part of the prefabricated secondary beam and the top face of the prefabricated cross beam, and the top of the end pre-buried reinforcing bar exposed from the top face of the prefabricated secondary beam and the prefabricated secondary beam reinforcing bar are both embedded in the concrete composite layer.

[0012] The prefabricated secondary beam is a channel steel beam, side pre-buried steel plates are embedded in the side face of the prefabricated cross beam, the part of the side pre-buried steel plates exposed from the side face of the prefabricated cross beam is connected with the end part of the prefabricated secondary beam, top pre-buried steel plates are arranged on the top face of the prefabricated cross beam, and the top pre-buried steel plates are connected with the pre-buried reinforcing bars on the floor slab.

[0013] The side face of the prefabricated cross beam is provided with pressure bearing protruding parts, two pairs of sides of the floor slab are fixed on the pressure bearing protruding parts on the side faces of adjacent prefabricated cross beams, the joint gap between the plate side of the floor slab arranged on the pressure bearing protruding parts and the side face of the prefabricated cross beam is filled with caulking glue, the joint gap filled with the caulking glue and the prefabricated cross beam and the floor slab around the joint gap filled with the caulking glue are coated with sealing paint, and the contact position between the floor slab and the pressure bearing protruding parts is coated with the sealing paint.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] The present application can effectively solve the problems of unguaranteed construction quality, large overall hoisting difficulty, and difficulty in cast-in-place concrete formwork, shorten the construction period, and reduce the construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a prestressed reinforced concrete roof truss structure schematic view;

[0017] Figure 2 is a side view of the present application;

[0018] Figure 3 is a schematic diagram of the explosion structure of the present application;

[0019] Figure 4 is a schematic diagram of the connection mode one of the inclined beam support block and the corresponding roof truss inclined beam;

[0020] Figure 5 is a schematic diagram of the connection mode two of the inclined beam support block and the corresponding roof truss inclined beam;

[0021] Figure 6 is a schematic diagram of the connection mode three of the inclined beam support block and the corresponding roof truss inclined beam;

[0022] Figure 7 is a schematic diagram of the connection mode four of the inclined beam support block and the corresponding roof truss inclined beam;

[0023] Figure 8 is a schematic diagram of the connection of the prefabricated cross beam and the bent column;

[0024] Figure 9 is a schematic diagram of the connection mode one between the prefabricated cross beam and the prefabricated secondary beam;

[0025] Figure 10 is a schematic diagram of the connection mode two between the prefabricated cross beam and the prefabricated secondary beam;

[0026] Figure 11 is a schematic diagram of the local construction joint treatment structure;

[0027] 1-prefabricated cross beam, 2-prefabricated folded roof truss, 3-bent column, 4-roof, 5-prefabricated secondary beam, 6-floor slab, 7-reinforcement connecting device, 8-mortar layer, 9-concrete connecting layer, 10-concrete superimposed layer, 11-caulking glue, 12-sealing paint, 101-inclined beam support block, 102-lap joint groove, 103-side embedded steel plate, 104-top embedded steel plate, 105-pressure convex part, 201-inclined beam, 202-inclined beam support column, 203-I-shaped steel connecting piece, 204-welding piece, 501-lap joint table, 502-end embedded bar, 503-embedded stirrup, 504-prefabricated secondary beam reinforcing bar. DETAILED DESCRIPTION

[0028] In order to facilitate those skilled in the art to understand and implement the present application, the present application will be further described in detail below in conjunction with examples. It should be understood that the examples described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0029] Example 1:

[0030] AsFigure 2 As shown, a detachable, formwork-free prefabricated reinforced concrete roof truss structure includes a precast beam 1 and a precast folded roof truss 2. The precast beam 1 and the precast folded roof truss 2 can be prefabricated in the factory. The bottom ends of the precast beam 1 are supported on the ground by frame columns 3. The top ends of the precast beam 1 are provided with inclined beam support blocks 101. The inclined beam support blocks 101 are used to support the inclined beams of the precast folded roof truss 2 and play a counter-support function. The precast folded roof truss 2 includes two inclined beams 201 connected at the top and distributed in a V-shape. The precast folded roof truss 2 also includes inclined beam support columns 202 connected at the top to the inclined beams 201. The bottom of the inclined beams 201 is connected to the corresponding inclined beam support blocks 101. The bottom of the inclined beam support columns 202 is fixedly supported on the precast beam 1. With the bottom of the two inclined beams 201 of the prefabricated folded roof truss 2 fixedly connected to the inclined beam support block 101 on the prefabricated crossbeam 1, and the inclined beams 201 supported on the prefabricated crossbeam 1 by the inclined beam support column 202, the prefabricated folded roof truss 2 is stably and reliably installed and fixed on the prefabricated crossbeam 1.

[0031] There are multiple prefabricated beams 1, and the number of prefabricated folded roof trusses 2 is the same as that of prefabricated beams 1. A roof 4 is laid between the inclined beams 201 of adjacent prefabricated folded roof trusses 2. The roof 4 adopts ordinary metal roof or other lightweight roof structure, and multiple prefabricated beams 1 are set in parallel.

[0032] Example 2:

[0033] like Figure 3 As shown, multiple rows of precast secondary beams 5 are arranged between adjacent precast horizontal beams 1. As a preferred option, the precast secondary beams 5 are arranged horizontally and perpendicularly to the precast horizontal beams 1, and floor slabs 6 are arranged between adjacent precast secondary beams 5. A ventilation channel is formed between the roof 4 and the floor slabs 6 to achieve good ventilation. The spacing between the precast secondary beams 5 can be adjusted according to the span of the precast secondary beams and the floor slab load. Prestressed construction using the pre-tensioning method can also be adopted according to the floor slab load and the span of the precast secondary beams. The floor slabs 6 can preferably be steel truss floor slabs or reinforced concrete composite slabs, which can be hoisted on site without formwork and have a certain thickness of cast-in-place layer to ensure the airtightness of the structure.

[0034] Everything else is the same as in Example 1.

[0035] Example 3:

[0036] like Figure 4 As shown, the reinforcing bars embedded at the bottom end face of the inclined beam 201 are fixedly connected to the reinforcing bars embedded at the support surface of the inclined beam support block 101.

[0037] As a preferred solution, the embedded steel bars between the bottom end face of the inclined beam 201 and the embedded steel bars of the support face of the inclined beam support block 101 are connected through a steel bar connecting device 7 (the steel bar connecting device 7 is an existing device, and can adopt the steel bar connecting device disclosed in Patent No. 202022055035.9, which will not be described in detail here).

[0038] The bottom end face of the inclined beam 201 and the support face of the inclined beam support block 101 are filled with a grout layer 8, and in this embodiment, the material of the grout layer 8 is high-strength cement-based grouting material.

[0039] As a preferred solution, the bottom end face of the inclined beam 201 and the support face of the inclined beam support block 101 are parallel and both perpendicular to the central axis of the inclined beam 201.

[0040] The rest is consistent with Embodiment 2.

[0041] Embodiment 4:

[0042] As shown in Figure 5 , the embedded steel bars between the bottom end face of the inclined beam 201 and the embedded steel bars of the support face of the inclined beam support block 101 are fixedly connected.

[0043] As a preferred solution, the embedded steel bars between the bottom end face of the inclined beam 201 and the embedded steel bars of the support face of the inclined beam support block 101 are connected through a steel bar connecting device 7.

[0044] The bottom end face of the inclined beam 201 and the support face of the inclined beam support block 101 are filled with a grout layer 8, and in this embodiment, the material of the grout layer 8 is high-strength cement-based grouting material.

[0045] The bottom end face of the inclined beam 201 is a stepped end face, and the support face of the inclined beam support block 101 is a stepped end face that matches the shape of the bottom end face of the inclined beam 201, so that the inclined beam 201 can bear the downward force perpendicular to the inclined beam 201, thereby increasing the load-bearing capacity of the prefabricated folded roof truss 2.

[0046] As a preferred solution, a boss is provided on the bottom end face of the inclined beam 201, and a placement groove is provided on the support face of the inclined beam support block 101, and the boss is inserted into the placement groove. When the inclined beam 201 bears the downward force perpendicular to the inclined beam 201, the load-bearing capacity of the inclined beam 201 is enhanced under the limiting action of the placement groove on the boss.

[0047] The rest is consistent with Embodiment 2.

[0048] Embodiment 5:

[0049] As shown in Figure 6As shown, both the bottom end face of the inclined beam 201 and the support surface of the inclined beam support block 101 have embedded I-beam connectors 203. The bottom end face of the inclined beam 201 and the embedded I-beam connectors 203 of the support surface of the inclined beam support block 101 are fixedly connected. As a preferred embodiment, a connecting piece is provided between the bottom end face of the inclined beam 201 and the embedded I-beam connectors 203 of the support surface of the inclined beam support block 101. The connecting piece is riveted to the embedded I-beam connectors 203 of the bottom end face of the inclined beam 201 and the embedded I-beam connectors 203 of the support surface of the inclined beam support block 101. A concrete connecting layer 9 is filled between the bottom end face of the inclined beam 201 and the support surface of the inclined beam support block 101. The bottom end of the inclined beam 201 and the inclined beam support block 101 are fixedly connected by the I-beam connector 203, and the connection strength between the bottom end of the inclined beam 201 and the inclined beam support block 101 is further increased by filling the concrete connection layer 9.

[0050] As a preferred embodiment, the bottom end face of the inclined beam 201 is parallel to the support surface of the inclined beam support block 101, and both are perpendicular to the central axis of the inclined beam 201.

[0051] Everything else is the same as in Example 2.

[0052] Example 6:

[0053] like Figure 7 As shown, both the bottom end face of the inclined beam 201 and the support surface of the inclined beam support block 101 have embedded weldment 204s. Each weldment 204 includes an embedded portion and a welded portion, which are connected. The welded portion of the weldment 204 embedded in the bottom end face of the inclined beam 201 and the support surface of the inclined beam support block 101 is welded together. As a preferred embodiment, the welded portion is elongated, with its length slightly greater than the length of the bottom end face of the inclined beam 201, to facilitate welding of the portion of the welded portion exposed on the bottom end face of the inclined beam 201. Other aspects are consistent with Embodiment 2.

[0054] Example 7:

[0055] like Figure 8 As shown, the reinforcing bars embedded at the bottom of the end of the precast beam 1 and the reinforcing bars embedded at the top support surface of the frame column 3 are fixedly connected. In a preferred embodiment, the reinforcing bars embedded at the bottom of the end of the precast beam 1 and the reinforcing bars embedded at the top support surface of the frame column 3 are fixedly connected by a reinforcing bar connecting device 7. A grout layer 8 is filled between the bottom of the end of the precast beam 1 and the top of the frame column 3. In this embodiment, the grout layer 8 is made of high-strength cement-based grout; the rest is the same as in embodiment 2.

[0056] Example 8:

[0057] like Figure 9As shown, the precast secondary beam 5 has an overlap platform 501 at its end, and the precast crossbeam 1 has an overlap groove 102 on its side. The overlap platform 501 is placed in the corresponding overlap groove 102. The top surface of the precast crossbeam 1 has overlap grooves 102 on both sides, which are used to connect with the overlap platforms 501 at the ends of the precast secondary beams 5 on both sides. The overlap grooves 102 help to better position the connection between the precast secondary beam 5 and the precast crossbeam 1. Multiple end-embedded reinforcing bars 502 are embedded in the ends of the precast secondary beam 5. The pre-embedded reinforcing bars 502 are fixed in the precast secondary beam 5 by pre-embedded stirrups 503. The top of each pre-embedded reinforcing bar 502 protrudes from the top surface of the precast secondary beam 5 and is fixed to the precast secondary beam reinforcing bar 504. A concrete filling layer 10 is laid at the connection between the end of the precast secondary beam 5 and the top surface of the precast crossbeam 1. The pre-embedded reinforcing bars 502 and the precast secondary beam reinforcing bars 504 that protrude from the top surface of the precast secondary beam 5 are both embedded in the concrete filling layer 10, thereby achieving a stable connection between the ends of the precast crossbeam 1 and the precast secondary beam 5.

[0058] As a preferred embodiment, the precast secondary beam reinforcing ribs 504 are connected above the top surface of the ends of the precast secondary beams 5 located on both sides of the precast beam 1. This achieves a more stable connection between the ends of the precast beam 1 and the precast secondary beams 5 on both sides.

[0059] Everything else is the same as in Example 2.

[0060] As another implementation method, based on the spacing of the prefabricated folded roof trusses 2, the prefabricated secondary beams 5 are eliminated, and there is no need to set up the prefabricated secondary beams 5. The floor slabs 6 are directly erected on the adjacent prefabricated crossbeams 1.

[0061] Example 9:

[0062] like Figure 10 As shown, a side-embedded steel plate 103 is embedded on the side of the precast beam 1, and the precast secondary beam 5 is an I-beam. The portion of the side-embedded steel plate 103 exposed on the side of the precast beam 1 is riveted or welded to the end of the precast secondary beam 5. This achieves a fixed connection between the precast beam 1 and the precast secondary beam.

[0063] The top surface of the precast beam 1 is provided with a top embedded steel plate 104, and the top embedded steel plate 104 is welded to the embedded steel bars on the floor slab 6, thereby realizing the connection between the precast beam 1 and the floor slab 6.

[0064] Everything else is the same as in Example 2.

[0065] As another implementation method, based on the spacing of the prefabricated folded roof trusses 2, the prefabricated secondary beams 5 are eliminated, and there is no need to set up the prefabricated secondary beams 5. The floor slabs 6 are directly erected on the adjacent prefabricated crossbeams 1.

[0066] Example 10:

[0067] like Figure 11As shown, the side of the prefabricated cross beam 1 is provided with a pressure bearing protrusion 105, and two pairs of sides of the floor slab 6 are respectively fixed on the pressure bearing protrusions 105 on the sides of the adjacent prefabricated cross beams 1. In the scheme of the embodiment, according to the distance between the prefabricated folded roof trusses 2, the prefabricated secondary beams 5 are cancelled, and the prefabricated secondary beams 5 are not needed to be arranged, and only the pressure bearing protrusions 105 on the sides of the prefabricated cross beams 1 are used to install and fix the floor slab 6.

[0068] As a preferred scheme, the beam plate gap between the plate side of the floor slab 6 arranged on the pressure bearing protrusion 105 and the side of the prefabricated cross beam 1 is filled with the caulking glue 11. In the embodiment, the material of the caulking glue 11 is silicone sealant, the beam plate gap filled with the caulking glue 11 and the prefabricated cross beam 1 and the floor slab 6 around the beam plate gap filled with the caulking glue 11 are coated with the sealing paint 12, and the contact between the floor slab 6 and the pressure bearing protrusion 105 is coated with the sealing paint 12. In the embodiment, the material of the sealing paint 12 is polysulfide sealing paint. The caulking glue 11 plays a certain deformation buffering role, and the sealing paint 12 plays a sealing role of the joint.

[0069] It should be noted that the embodiments described in the utility model are only examples of the spirit of the utility model. The skilled in the art to which the utility model belongs can make various modifications or supplements to the described embodiments or use similar ways to replace, but will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

Claims

1. A kind of dismantled free support module assembly type reinforced concrete roof structure, including prefabricated beam (1) and prefabricated folded roof (2), it is characterized in that, The top of both ends of the prefabricated cross beam (1) is provided with a diagonal beam support block (101), the prefabricated folded roof truss (2) comprises two diagonal beams (201) which are connected at the top and in a herringbone distribution, the prefabricated folded roof truss (2) further comprises a diagonal beam support column (202) which is connected at the top with the diagonal beam (201), the bottom of the diagonal beam (201) is connected with the corresponding diagonal beam support block (101) respectively, the bottom of the diagonal beam support column (202) is supported and fixed on the prefabricated cross beam (1), the prefabricated cross beam (1) is multiple and arranged in parallel, the number of the prefabricated folded roof truss (2) is the same as that of the prefabricated cross beam (1), the roof (4) is laid between the diagonal beams (201) of adjacent prefabricated folded roof trusses (2), the steel bars embedded in the bottom of the end of the prefabricated cross beam (1) and the steel bars embedded in the top support surface of the bent column (3) are fixedly connected through the steel bar connecting device (7), and the slurry layer (8) is filled between the bottom of the end of the prefabricated cross beam (1) and the top of the bent column (3).

2. The dismountable free-standing formwork assembled type reinforced concrete roof truss structure according to claim 1, characterized in that, A plurality of prefabricated secondary beams (5) are arranged between adjacent prefabricated cross beams (1), and a floor slab (6) is arranged between adjacent prefabricated secondary beams (5).

3. The dismountable free-standing formwork assembled type reinforced concrete roof truss structure according to claim 2, characterized in that, The steel bars embedded in the bottom end face of the diagonal beam (201) and the steel bars embedded in the support surface of the diagonal beam support block (101) are connected through the steel bar connecting device (7), and the slurry layer (8) is filled between the bottom end face of the diagonal beam (201) and the support surface of the diagonal beam support block (101).

4. The dismountable free-standing formwork assembled type reinforced concrete roof truss structure according to claim 3, characterized in that, The bottom end face of the diagonal beam (201) is a stepped end face, and the support surface of the diagonal beam support block (101) is a stepped end face which is matched with the shape of the bottom end face of the diagonal beam (201).

5. The dismountable free-standing formwork assembled type reinforced concrete roof truss structure according to claim 2, characterized in that, The bottom end face of the diagonal beam (201) and the support surface of the diagonal beam support block (101) are both pre-buried with I-beam connecting pieces (203), the pre-buried I-beam connecting pieces (203) between the bottom end face of the diagonal beam (201) and the support surface of the diagonal beam support block (101) are fixedly connected, and the concrete connecting layer (9) is filled between the bottom end face of the diagonal beam (201) and the support surface of the diagonal beam support block (101).

6. The dismountable free-standing formwork assembled type reinforced concrete roof truss structure according to claim 2, characterized in that, The bottom end face of the diagonal beam (201) and the support surface of the diagonal beam support block (101) are both pre-buried with welding pieces (204), the welding piece (204) comprises a pre-buried part and a welding part, the pre-buried part and the welding part are connected, and the welding parts of the pre-buried welding pieces (204) between the bottom end face of the diagonal beam (201) and the support surface of the diagonal beam support block (101) are welded and connected.

7. The dismountable free-standing formwork assembled type reinforced concrete roof truss structure according to claim 2, characterized in that, The end of the prefabricated secondary beam (5) is provided with a lap platform (501), the top surface of the prefabricated cross beam (1) is provided with a lap groove (102) on both sides, the lap platform (501) of the end of the prefabricated secondary beam (5) on both sides of the prefabricated cross beam (1) is placed in the corresponding lap groove (102), a plurality of end embedded bars (502) are embedded in the end of the prefabricated secondary beam (5), each end embedded bar (502) is fixed by an embedded stirrup (503), the top of each end embedded bar (502) is exposed from the top surface of the end of the prefabricated secondary beam (5) and is fixed with a prefabricated secondary beam reinforcing bar (504), a concrete filling layer (10) is arranged at the connection between the end of the prefabricated secondary beam (5) and the top surface of the prefabricated cross beam (1), and the top of the end embedded bar (502) exposed from the top surface of the prefabricated secondary beam (5) and the prefabricated secondary beam reinforcing bar (504) are embedded in the concrete filling layer (10).

8. The dismountable free-standing formwork assembled type reinforced concrete roof truss structure according to claim 2, characterized in that, The prefabricated secondary beam (5) is a H-shaped steel beam, a side embedded steel plate (103) is embedded in the side surface of the prefabricated cross beam (1), the part of the side embedded steel plate (103) exposed from the side surface of the prefabricated cross beam (1) is connected with the end of the prefabricated secondary beam (5), and a top embedded steel plate (104) is arranged on the top surface of the prefabricated cross beam (1) and connected with the embedded steel bars on the floor slab (6).

9. The dismountable free-standing formwork assembled type reinforced concrete roof truss structure according to claim 1, characterized in that, The side surface of the prefabricated cross beam (1) is provided with a pressure bearing protruding part (105), two pairs of sides of the floor slab (6) are respectively fixed on the pressure bearing protruding parts (105) on the side surfaces of adjacent prefabricated cross beams (1), the beam plate gap between the plate side of the floor slab (6) arranged on the pressure bearing protruding part (105) and the side surface of the prefabricated cross beam (1) is filled with caulking glue (11), the beam plate gap filled with the caulking glue (11) and the prefabricated cross beam (1) and the floor slab (6) around the beam plate gap filled with the caulking glue (11) are coated with sealing paint (12), and the contact between the floor slab (6) and the pressure bearing protruding part (105) is coated with the sealing paint (12).

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