CN215167014U - Hollow superimposed sheet with steel bar truss - Google Patents

Abstract

The utility model relates to a hollow superimposed sheet with steel bar truss belongs to general building structure field. The composite slab comprises a bottom prefabricated part (1) and an upper laminated layer (2), the prefabricated part is in a long strip shape, two-way configuration of bottom plate reinforcing steel bars (4) is performed in a bottom plate (3) of the prefabricated part, 3 rows or more than 3 rows, 5 rows or more than 5 rows of filling bodies (5) of light materials are arranged on the upper portion of each prefabricated part, reinforcing steel bar trusses (8) are embedded in at least two longitudinal solid ribs, transverse supports (12) are installed in at least 3 transverse solid ribs, the prefabricated parts above 2 or 2 are connected in parallel, reinforcing steel bars (17) on the upper portion of the composite slab are placed on the reinforcing steel bar trusses or the transverse supports, and concrete is poured to form the composite slab. The utility model discloses superimposed sheet dead weight is light, be suitable for the span big, be convenient for transportation and installation, the utility model discloses fine economic nature and suitability have, play the impetus to building technology development.

Description

Hollow superimposed sheet with steel bar truss

(I) technical field

The utility model relates to a hollow superstructure structure of assembled reinforced concrete, especially a hollow superimposed sheet with steel bar truss belongs to general building structure field.

(II) background of the invention

The assembly type building has the characteristics of high factory production degree, high construction speed and low comprehensive cost, and the structural form is widely popularized by the nation at present.

For the assembled floor system with the span of less than 5m, the common laminated slab can solve the problem; however, if the floor with the span of more than 5m, especially the span of more than 7m is adopted, the structure has heavy self weight, poor earthquake-resistant performance and lower comprehensive economic index. For the floor structure, no matter cast-in-place or laminated structure, hollowing is a technical means for solving the problem of large span.

Before 2004, the maximum span of the traditional laminated floor system does not exceed 6m, and then a prestressed bidirectional laminated floor system (CN2642887Y) is proposed by Xuanxiao, Wangxiang and the like. Then, gaoyianyu, wushunhong, etc. proposed "prestressed concrete laminated slab" (CN2706530), "honeycomb hole type ribbed prestressed concrete laminated slab" (CN102995805A) and "a box type prestressed concrete lightweight laminated slab" (CN 203603332U). However, the above techniques exist separately: the prefabricated member has the defects of small width, large self weight or poor connection performance between adjacent prefabricated members, and is only suitable for unidirectional plates.

In 2017, the inventor respectively provides a technology of 'a wide hollow laminated slab' (CN107254930A) and 'a prestressed hollow laminated slab' (CN107313539A), and overcomes the defects that a prefabricated part is small in width, heavy in self weight and not suitable for a bidirectional slab; in 2020, the inventor also proposed "a hollow laminated plate with a drawknot bracket" (CN 112302227A). In tens of tests, i found that CN107254930A and CN107313539A had the following problems: 1. the concrete prefabricated and cast-in-place in the hollow composite slab is only contacted with the solid ribs among the filling bodies, the contact area is small, so that the bonding force among new and old concrete is insufficient, and the bearing capacity of the member is reduced due to split cracks generated on the contact surface along the horizontal direction of the member; 2. because the hollow slab composite slab has larger span than the traditional composite slab, even if the prefabricated member is relatively thicker, the rigidity of the prefabricated member is weaker during hoisting transportation because the proportion of the solid ribs occupying the total area is very small; 3. the strength of the filler in the prefabricated member is low, and the filler is easy to damage when a plurality of prefabricated members are stacked and transported. Although CN112302227A can effectively overcome the above drawbacks, the drawknot stent adopted in CN112302227A still has the following drawbacks: 1. if the anchoring length of the supporting leg is not enough, the safety accident is easily caused when the supporting leg is pulled out during hoisting; 2. the support legs of the drawknot bracket are approximately vertical to the prefabricated members, and the steel bars are easy to bend and lose stability under heavy load (such as stacking and transporting a plurality of prefabricated members); 3. the horizontal rod is connected with the tops of the supporting legs in a welding or binding mode, so that the production efficiency of the drawknot bracket is low.

Under the circumstances, the development of a laminated slab technology for overcoming the defects is an urgent problem to be solved in the current assembled laminated floor system.

Disclosure of the invention

In the existing assembled type laminated floor system technology, the following exists: 1. the prefabricated part has small span, self weight and rigidity; 2. the width of the prefabricated part is small; 3. the connection performance between adjacent prefabricated parts is poor, and the prefabricated parts are not suitable for bidirectional plates; 4. the hollow prefabricated member and the laminated layer have poor combination performance of new and old concrete, and the filling body is easy to damage; 5. the hoisting performance is poor; 6. the transport performance is poor; 7. low grade problem of production efficiency, an object of the utility model is to provide a hollow superimposed sheet with steel bar truss.

In order to realize the above purpose, on the basis of the prior art and the experiment, the utility model discloses a technical scheme is: a hollow composite slab with steel bar trusses is of a reinforced concrete structure and comprises prefabricated parts at the bottom and a composite layer at the upper part, the prefabricated parts are long-strip-shaped, the width of each prefabricated part is more than or equal to 1800mm and less than or equal to 3500mm, the length of each prefabricated part is more than or equal to 5000mm and less than or equal to 10000mm, the thickness of bottom plate concrete of the prefabricated parts is more than or equal to 40mm and less than or equal to 65mm, bottom plate steel bars are arranged in the bottom plate in a bidirectional mode, filler bodies made of light materials with more than 3 rows or 5 columns or more than 5 columns are arranged at the upper part of each prefabricated part, concrete longitudinal solid ribs or transverse solid ribs are arranged between adjacent filler bodies in the prefabricated parts or at the edges of the filler bodies, the steel bar trusses are embedded in at least two longitudinal solid ribs, each steel bar truss is composed of an upper chord rib, two lower chord ribs and web ribs at two sides, the top height of the steel bar trusses exceeds the top height of the filler bodies, and a transverse support is arranged in at least 3 transverse solid ribs, each transverse support is composed of a transverse rib and at least 3 supporting legs, the transverse rib of each transverse support is positioned at the upper part of the upper chord rib of the steel bar truss, the lower parts of the supporting legs are anchored in concrete of prefabricated parts, 2 or more than 2 prefabricated parts are connected in parallel, bottom plate steel bars between adjacent prefabricated parts are mutually overlapped in a splicing region, extending sections of the bottom plate steel bars of the prefabricated parts except the splicing region are all anchored into a beam or a wall support of a periphery, upper steel bars of the laminated slab are placed on the steel bar truss or the transverse supports, the upper steel bars are bound, laminated concrete is poured, the minimum thickness of the concrete of a laminated layer on the upper part of the filling body is more than or equal to 40mm and less than or equal to 100mm, and the laminated slab is formed. The width of each prefabricated part is more than or equal to 1800mm and less than or equal to 3500mm, so that the number of the prefabricated parts in the floor slab can be reduced, and the proportion of the joint area cost in the total manufacturing cost is reduced. The length of the prefabricated member is more than or equal to 5000mm and less than or equal to 10000mm, so that the laminated slab can be suitable for large span and meet the normal transportation requirement. The upper part of each prefabricated member is provided with 3 rows or more than 3 rows, 5 columns or more than 5 columns of light material filling bodies, and the longitudinal solid ribs and the transverse solid ribs between the adjacent filling bodies or at the edges in each prefabricated member can improve the hollow rate of the prefabricated member and ensure that enough solid ribs participate in structural stress. The filling body can be arranged on the prefabricated member in advance, and can also be embedded after the concrete of the prefabricated member is formed and hardened. The inventor finds in a component experiment that the closer to a splicing region, the more easily horizontal split cracks appear between a prefabricated part and a superposed layer, so that a solid rib near the splicing region belongs to a weak part and special measures are taken to strengthen the tensile joint. The steel bar trusses are embedded in the at least two longitudinal solid ribs, are of spatial three-dimensional structures and have triangular stability horizontally in two directions, so that the rigidity in any direction is very high, and the prefabricated parts are suitable for being stacked up and down for storage and transportation; the upper chord rib of the steel bar truss can increase the rigidity of the prefabricated member, the prefabricated member is not easy to crack during hoisting, the anchoring performance of the web rib in the prefabricated member is good due to the fact that the web rib is connected with the lower chord rib, the hoisting safety is enhanced, and the lower chord rib can be used as a stress rib for two purposes; the steel bar truss can realize automatic flow production and has high production efficiency. The installation of the transverse brackets in at least 3 transverse solid ribs is primarily to increase the transverse rigidity of the prefabricated member, since the vertical forces during production and transport are mainly borne by the steel bar trusses, and the transverse brackets can be designed simply to reduce the production cost by only dispersing the vertical forces. The top height of the steel bar truss exceeds the top height of the filling body, and when the filling body is embedded in advance, the steel bar truss and the transverse support can protect the filling body in the production and transportation processes. In site operation, 2 or more than 2 prefabricated parts are connected in parallel, the steel bars on the upper part of the laminated slab are placed on the steel bar truss or the transverse support and then bound, the steel bar truss and the transverse support play the role of a steel bar stirrup or a vertical bar, and related material cost and manufacturing cost can be saved.

The utility model discloses a longitudinal reinforcement in characterized in that prefab bottom plate reinforcing bar is located the upper portion of horizontal reinforcing bar, and steel bar truss's web reinforcement is the broken line type, and last chord muscle diameter is greater than or equal to 8mm, and lower chord muscle diameter is greater than or equal to longitudinal reinforcement's diameter, and lower chord muscle is located the same deck with longitudinal reinforcement. The longitudinal steel bar is positioned at the upper part of the transverse steel bar, so that the lower chord steel bar and the longitudinal steel bar can be positioned at the same layer, the lower chord steel bar can be used as an anchoring measure of the web bar and can also participate in stress, and when the diameter is larger than or equal to that of the longitudinal steel bar, the lower chord steel bar can directly replace the longitudinal steel bar to reduce the manufacturing cost of the prefabricated member.

The utility model is characterized in that the supporting legs of the transverse support are partially encrypted in the range of two ends. The supporting legs are only partially encrypted within the range of the end head with larger stress, so that the manufacturing cost can be reduced; if the end is positioned in the abutted seam area with larger bending moment, the supporting legs can enhance the bonding between the prefabricated part near the area and the cast-in-place concrete; if the end head is positioned on the side support with larger shearing force, the supporting leg can improve the shearing resistance of the section near the support.

The utility model is characterized in that the drawknot steel bar is pre-buried in the vertical solid rib or the horizontal solid rib of the part of the prefabricated member, and the buried depth and the exposed length of the drawknot steel bar in the concrete of the prefabricated member are all more than or equal to 30 mm. The utility model discloses a technical problem that solve is the splitting phenomenon that hollow prefab and coincide layer concrete produced because of the drawknot power is not enough, this problem can be solved to pre-buried steel bar truss or horizontal stand in solid rib, but the two installation that the cost is higher relatively also shows complicacy slightly, hoist and mount as the prefab, the back has been solved to the protection problem of transportation and obturator, in order to further improve anti splitting ability, pre-buried drawknot steel bar prevents that horizontal shear from destroying just a cheap, it is simple, efficient technical scheme, the steel bar only plays a cotter pin effect, so no matter pre-buried still expose and all needn't be too long as long more than or equal to 30mm just can.

The utility model is characterized in that when the superimposed sheet is two-way board, the post-cast strip width in adjacent prefab piece district is greater than or equal to 100mm and is less than or equal to 300mm, and in the piece district, the horizontal reinforcing bar between the adjacent prefab is bent upwards, and the department of buckling at horizontal reinforcing bar sets up 2 and presses the muscle. The press rib can participate in the bending resistance stress in the short span direction of the bidirectional plate, and can also enhance the anchoring performance of the transverse steel bar in the splicing region.

The utility model is characterized in that the whole or partial longitudinal steel bars of the prefabricated member are high-strength prestressed bars. After the prestressed reinforcing steel is adopted, the using amount of the reinforcing steel can be reduced, the manufacturing cost of the prefabricated member can be reduced, the anti-cracking capacity of the laminated slab in the normal use process can be improved, and the durability of the structure is better.

The utility model is characterized in that the filling body is arranged at the rear, a notch matched with the size and the shape of the filling body is reserved in the process of forming the prefabricated member, and the filling body is embedded into the notch after the prefabricated member is formed. By adopting the technical scheme of embedding the filler, the phenomenon that the filler is damaged in the processes of manufacturing, transporting and hoisting of the prefabricated member can be avoided, and in field construction, pipelines, lamp caps and the like which need to be embedded in the laminated slab can be arranged in the region with the thinnest concrete at the lower part of the filler, so that the workload of cutting and opening the concrete is reduced; when the pipeline and the like conflict with the position of the filling body, corresponding treatment is carried out on the filling body easy to cut and drill, and the pipeline construction can be facilitated.

The utility model is characterized in that when the filling body is placed in advance, the main material is polyphenyl foam or rigid plastic, the periphery of the upper and lower surfaces of the filling body is provided with a chamfer, the middle part of the filling body is provided with a vertical slurry leaking hole, the upper end of the slurry leaking hole is a funnel-shaped with a big end down, and the lower end is an inverted funnel-shaped with a big end down. The peripheries of the upper surface and the lower surface of the filling body are chamfered, so that the phenomena of stress concentration and thickness mutation are eliminated; on the other hand, the concrete on the upper part of the filling body is an arch cover, so that the capability of bearing concentrated load of a floor can be greatly enhanced, and the chamfer angle or chamfer angle on the lower part of the filling body can facilitate the pouring of the concrete. A vertical slurry leakage hole is formed in the middle of the filling body, and the upper funnel of the slurry leakage hole greatly accelerates the speed of concrete flowing into the slurry leakage hole; the lower funnel can ensure that coarse aggregate in the concrete can flow to the lower part of the filling body rapidly and without obstacles, and ensure that the concrete is poured compactly.

After the scheme is adopted, compared with the prior art, the utility model following beneficial effect has:

the utility model discloses at first overcome that traditional solid superimposed sheet is suitable for the shortcoming that the span is little, the prefab dead weight is big, compare with prior art such as CN112302227A, the effect is also very obvious: 1. the problem that horizontal split cracks are easy to occur between the prefabricated part and the laminated layer of the hollow laminated slab is solved; 2. the rigidity of the prefabricated part is increased, so that the transportation and the stacking of the components are facilitated; 3. a plurality of hoisting points are formed on the steel bar truss, so that the prefabricated member can be conveniently hoisted; 4. the existence of the steel bar truss and the transverse support increases the protection strength of the filling body; 5. the steel bar truss and the transverse bracket can be used as erection bars of upper steel bars in later construction, so that related manpower and material resources can be saved; 6. the bending or shearing resistance of the member is enhanced.

The utility model discloses a prefabricated component's dead weight is light, prefabricated and coincide layer concrete associativity is good among hollow superimposed sheet with steel bar truss, is suitable for the span big, applicable in two-way board, be convenient for transportation and installation. The utility model discloses have fine economic nature and suitability, play the promotion effect to the development of building technology.

(IV) description of the drawings

The present invention will be further explained with reference to the accompanying drawings.

FIG. 1 is a plan view of a composite slab of the present invention

FIG. 2 is a schematic view of the vertical section structure of the composite slab of the present invention

FIG. 3 is a plan view of the single prefabricated member in the composite slab of the present invention

FIG. 4 is a cross-sectional view A-A of the preform of FIG. 3

FIG. 5 is a schematic view of a steel truss structure

FIG. 6 is a schematic view of a transverse strut configuration

FIG. 7 is a partial big picture of the joint area of the laminated slab of the present invention

FIG. 8 is a schematic diagram of post-embedding of a filler in a preform

FIG. 9 is a vertical cross-sectional view of the packing

FIG. 10 is a plan view of the packing

In the figure: 1. the prefabricated member comprises a prefabricated member, 2 parts of a laminated layer, 3 parts of a base plate, 4 parts of base plate reinforcing steel bars, 5 parts of a filling body, 6 parts of longitudinal solid ribs, 7 parts of transverse solid ribs, 8 parts of a reinforcing steel bar truss, 9 parts of upper chord reinforcing steel bars, 10 parts of lower chord reinforcing steel bars, 11 parts of web reinforcing steel bars, 12 parts of transverse supports, 13 parts of transverse reinforcing steel bars, 14 parts of supporting legs, 15 parts of splicing areas, 16 parts of supports, 17 parts of upper reinforcing steel bars, 18 parts of longitudinal reinforcing steel bars, 19 parts of transverse reinforcing steel bars, 20 parts of tie reinforcing steel bars, 21 parts of press bars, 22 parts of prestressed reinforcing steel bars, 23 parts of notches, 24 parts of chamfers and 25 parts of slurry leakage holes.

(V) detailed description of the preferred embodiments

The utility model discloses a realize according to following mode:

in the embodiment shown in fig. 1-7, the hollow composite slab with the steel bar trusses is a reinforced concrete structure and comprises prefabricated members (1) at the bottom and a laminated layer (2) at the upper part, the prefabricated members are strip-shaped, the width of each prefabricated member is more than or equal to 1800mm and less than or equal to 3500mm, the length of each prefabricated member is more than or equal to 5000mm and less than or equal to 10000mm, the concrete thickness of a bottom plate (3) of the prefabricated member is more than or equal to 40mm and less than or equal to 65mm, bottom plate steel bars (4) are arranged in the bottom plate in a bidirectional mode, more than 3 rows or 3 rows, 5 columns or more than 5 columns of filling bodies (5) made of light materials are arranged at the upper part of each prefabricated member, concrete longitudinal solid ribs (6) or transverse solid ribs (7) are arranged between adjacent filling bodies in the prefabricated member or at the edges of the filling bodies, the steel bar trusses (8) are embedded in at least two longitudinal solid ribs, each steel bar truss is composed of an upper chord rib (9), two lower chord ribs (10) and web ribs (11) at two sides, the top height of the steel bar truss exceeds the top height of the filling body, transverse supports (12) are installed in at least 3 transverse solid ribs, each transverse support is composed of a transverse rib (13) and at least 3 supporting legs (14), the transverse ribs of each transverse support are located on the upper portions of upper chord ribs of the steel bar truss, the lower portions of the supporting legs are anchored in concrete of prefabricated parts, 2 or more than 2 prefabricated parts are connected in parallel, bottom plate steel bars between adjacent prefabricated parts are mutually overlapped in a splicing region (15), extending sections of the bottom plate steel bars of the prefabricated parts except the splicing region are all anchored into a beam or a wall support (16) of a periphery, upper steel bars (17) of the laminated slab are placed on the steel bar truss or the transverse supports, upper steel bars are bound, laminated concrete is poured, the minimum thickness of the concrete of a laminated layer on the upper portion of the filling body is larger than or equal to 40mm and smaller than or equal to 100mm, and the laminated slab is formed.

In the embodiment shown in fig. 1, 3-5 and 7, the longitudinal steel bars (18) in the prefabricated bottom plate steel bars (4) are positioned at the upper parts of the transverse steel bars (19), the web bars (11) of the steel bar truss are of a broken line type, the diameter of the upper chord bars (9) is more than or equal to 8mm, the diameter of the lower chord bars (10) is more than or equal to that of the longitudinal steel bars, and the lower chord bars and the longitudinal steel bars are positioned at the same layer.

In the embodiment shown in fig. 1, 3 and 6, the legs (14) of the transverse support (12) are partially encrypted in the region of the two ends.

In the embodiment shown in fig. 3 and 4, the tie bars (20) are embedded in part of the longitudinal solid ribs (6) or the transverse solid ribs (7) of the prefabricated member (1), and the embedded depth and the exposed length of the tie bars in the concrete of the prefabricated member are both more than or equal to 30 mm.

In the embodiment shown in fig. 1 and 7, when the laminated slab is a bidirectional slab, the width of a post-cast strip in a splicing region (15) of adjacent prefabricated components (1) is more than or equal to 100mm and less than or equal to 300mm, in the splicing region, transverse steel bars (19) between the adjacent prefabricated components bend upwards, and 2 press bars (21) are arranged at the bending positions of the transverse steel bars.

In the embodiment shown in fig. 3 and 4, all or part of the longitudinal reinforcements (18) of the prefabricated member (1) are high-strength prestressed reinforcements (22).

In the embodiments shown in fig. 1-4, 7 and 8, the filling body (5) is arranged at the rear, a notch (23) which is matched with the size and the shape of the filling body is reserved on the filling body (5) in the forming process of the prefabricated member (1), and the filling body is inserted into the notch after the prefabricated member is formed.

In the embodiment shown in fig. 1, 3, 4, 7-10, when the filling body (5) is pre-arranged, the main material is polyphenyl foam or rigid plastic, the peripheries of the upper surface and the lower surface of the filling body are provided with chamfers (24), the middle part of the filling body is provided with a vertical slurry leaking hole (25), the upper end of the slurry leaking hole is funnel-shaped with a large upper part and a small lower part, and the lower end of the slurry leaking hole is inverted funnel-shaped with a small upper part and a large lower part.

Claims (8)

1. A hollow composite slab with steel bar trusses is of a reinforced concrete structure and comprises prefabricated parts (1) at the bottom and a composite layer (2) at the upper part, and is characterized in that the prefabricated parts are long-strip-shaped, the width of each prefabricated part is more than or equal to 1800mm and less than or equal to 3500mm, the length of each prefabricated part is more than or equal to 5000mm and less than or equal to 10000mm, the concrete thickness of a bottom plate (3) of the prefabricated part is more than or equal to 40mm and less than or equal to 65mm, bottom plate steel bars (4) are arranged in the bottom plate in a bidirectional mode, more than 3 lines or 3 lines, more than 5 lines or more than 5 lines of light material filling bodies (5) are arranged at the upper part of each prefabricated part, concrete longitudinal solid ribs (6) or transverse solid ribs (7) are arranged between adjacent filling bodies in the prefabricated parts or at the edges of the filling bodies, steel bar trusses (8) are embedded in at least two longitudinal solid ribs, each steel bar truss is composed of an upper chord rib (9), two lower chord ribs (10) and web ribs (11) at two sides, the top height of the steel bar truss exceeds the top height of the filling body, transverse supports (12) are installed in at least 3 transverse solid ribs, each transverse support is composed of a transverse rib (13) and at least 3 supporting legs (14), the transverse ribs of each transverse support are located on the upper portions of upper chord ribs of the steel bar truss, the lower portions of the supporting legs are anchored in concrete of prefabricated parts, 2 or more than 2 prefabricated parts are connected in parallel, bottom plate steel bars between adjacent prefabricated parts are mutually overlapped in a splicing region (15), extending sections of the bottom plate steel bars of the prefabricated parts except the splicing region are all anchored into a beam or a wall support (16) of a periphery, upper steel bars (17) of the laminated slab are placed on the steel bar truss or the transverse supports, upper steel bars are bound, laminated concrete is poured, the minimum thickness of the concrete of a laminated layer on the upper portion of the filling body is larger than or equal to 40mm and smaller than or equal to 100mm, and the laminated slab is formed.

2. The hollow composite slab with the steel bar truss as claimed in claim 1, wherein the longitudinal steel bars (18) in the bottom plate steel bars (4) of the prefabricated member are positioned at the upper parts of the transverse steel bars (19), the web bars (11) of the steel bar truss are of a broken line type, the diameter of the upper chord bars (9) is more than or equal to 8mm, the diameter of the lower chord bars (10) is more than or equal to the diameter of the longitudinal steel bars, and the lower chord bars and the longitudinal steel bars are positioned at the same layer.

3. A hollow composite slab with steel bar trusses as claimed in claim 1, wherein the legs (14) of the transversal support (12) are partially encrypted in the area of both ends.

4. A hollow composite slab with a steel bar truss as claimed in claim 1, wherein the tie bars (20) are embedded in part of the longitudinal solid ribs (6) or the transverse solid ribs (7) of the prefabricated member (1), and the embedded depth and the exposed length of the tie bars in the concrete of the prefabricated member are both more than or equal to 30 mm.

5. The hollow composite slab with the steel bar truss as claimed in claim 1, wherein when the composite slab is a bidirectional slab, the width of a post-cast strip of a splicing region (15) of adjacent prefabricated members (1) is greater than or equal to 100mm and less than or equal to 300mm, in the splicing region, transverse steel bars (19) between the adjacent prefabricated members bend upwards, and 2 press bars (21) are arranged at the bending positions of the transverse steel bars.

6. A hollow composite slab with steel bar trusses according to claim 1, wherein all or a part of the longitudinal steel bars (18) of the prefabricated member (1) are high-strength prestressed bars (22).

7. The hollow composite slab with the steel bar truss as claimed in claim 1, wherein the filling body (5) is arranged at the rear, a notch (23) matched with the filling body in size and shape is reserved on the filling body (5) in the forming process of the prefabricated member (1), and the filling body is embedded into the notch after the prefabricated member is formed.

8. The hollow composite slab with the steel bar truss as claimed in claim 1, wherein the filler (5) is pre-installed, the main material of the filler is polyphenyl foam or rigid plastic, the peripheries of the upper and lower surfaces of the filler are provided with chamfers (24), the middle part of the filler is provided with a vertical grout leakage hole (25), the upper end of the grout leakage hole is funnel-shaped with a large upper part and a small lower part, and the lower end of the grout leakage hole is inverted funnel-shaped with a small upper part and a large lower part.

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