Formwork and construction methods for concrete pouring of concrete slab-steel truss composite beams

Abstract

This invention discloses a formwork and construction method for concrete pouring of concrete slab-steel truss composite beams, relating to the field of bridge concrete processing. The upper part of the formwork body is reliably connected to the precast concrete slab via several truss-type tie rods, while the lower part is reliably connected to an inverted π-shaped steel base plate via sliding rails and limiting holes. Several longitudinal and vertical stiffening ribs are arranged on the outer surface of the formwork body. This three-part structure significantly increases the load-bearing capacity and lateral stiffness of the sliding formwork system. The truss-type tie rods, formwork connecting plates, and sliding rails can be flexibly arranged according to construction requirements, and the truss-type tie rods have length adjustment functions, giving the formwork body excellent flexibility. After the sliding formwork system is installed according to the design, concrete can be poured by inserting the limiting blocks. After construction is completed, the expansion bolts and limiting blocks are removed, allowing the formwork body to slide along the sliding rails to the next segment. The entire construction process is simple to operate and extremely efficient.

Description

Technical Field

[0001] This invention belongs to the field of bridge concrete processing technology, and in particular relates to a formwork and construction method for concrete pouring of concrete slab-steel truss composite beams. Background Technology

[0002] In modern bridge construction, concrete slab-steel truss composite beams, as a novel type of composite beam component, possess good overall stability and structural wind resistance. The general construction sequence for concrete slab-steel truss composite beams is as follows: first, the steel truss section is hoisted; then, the corresponding precast bridge deck segments are laid; and finally, the concrete wet joints are poured. Due to the large overall free height of the concrete slab-steel truss composite beam, there are difficulties in formwork erection and low construction efficiency when pouring the concrete wet joints. Existing formwork technology cannot complete the formwork erection on the free side. Therefore, it is necessary to propose an efficient and feasible formwork construction method for concrete pouring of concrete slab-steel truss composite beams. Summary of the Invention

[0003] In view of this, in order to solve the technical problems mentioned in the background art, the present invention proposes a formwork and construction method for concrete pouring of concrete slab-steel truss composite beams.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a formwork for concrete pouring of concrete slab-steel truss composite beam, comprising a formwork body, several longitudinal stiffening ribs, several vertical stiffening ribs, several formwork connecting plates, slide rails, limiting blocks, mounting plates, several transverse tie rods, several diagonal tie rods, an inverted π-shaped steel bottom plate, and a precast bridge deck.

[0005] The top of the template body is welded and fixed with several template connecting plates. The bottom of the template body is longitudinally slidably connected to the top of the slide rail. Several longitudinal stiffening ribs and several vertical stiffening ribs are welded on one side of the template body. The longitudinal stiffening ribs and several vertical stiffening ribs are arranged perpendicularly. An installation plate is installed at the bottom of the inverted π-shaped steel base plate. The bottom of the slide rail is laterally slidably connected to the top of the installation plate. The horizontal tie rod and the diagonal tie rod are both connected to the template connecting plates and the precast bridge panel. One end of the horizontal tie rod and the diagonal tie rod is connected to several template connecting plates, and the other end is connected to the precast bridge panel.

[0006] Furthermore, the template body has several template limiting holes on its side and the slide rail has several slide rail limiting holes on its side. The relative positions of the template body and the slide rail are fixed by several limiting blocks inserted into the template limiting holes and the slide rail limiting holes.

[0007] Furthermore, the slide rail has several slide rail strip-shaped openings, and the mounting plate has several mounting plate strip-shaped openings. The relative positions of the slide rail and the mounting plate are fixed by several fastening screws I installed in the slide rail strip-shaped openings and the mounting plate strip-shaped openings.

[0008] Furthermore, the dimensions and opening positions of the template limiting hole and slide rail limiting hole, the slide rail strip opening and the mounting plate strip opening are respectively matched with each other, so that a through hole can be formed after installation.

[0009] Furthermore, the slide rail is provided with protruding ribs, and the mounting plate is provided with grooves, the protruding ribs and grooves being sized to match each other.

[0010] Furthermore, the connection point between the template body and the template connecting plate is at the junction of the longitudinal stiffening rib and the vertical stiffening rib.

[0011] Furthermore, the lateral tie rod and the diagonal tie rod have the same structure. The lateral tie rod includes two tie rod connecting plates, two telescopic rods, and an adjusting screw. The tie rod connecting plate, the telescopic rod, the adjusting screw, the other telescopic rod, and the other tie rod connecting plate are connected in sequence.

[0012] Furthermore, an adjusting screw is threaded between the two telescopic rods, and the adjusting screw has positive and negative thread structures at both ends.

[0013] Furthermore, at least one diagonal tie rod is installed between adjacent lateral tie rods to form a Z-shape.

[0014] A construction method for a sliding formwork for concrete pouring of a concrete slab-steel truss composite beam includes the following steps:

[0015] Step 1: Prefabrication: Weld several template connecting plates to the top of the template body, weld several longitudinal stiffening ribs and several vertical stiffening ribs to one side of the template body, open several template limiting holes on the template body, open several connecting plate bolt holes on several template connecting plates, open several slide rail limiting holes and several slide rail strip-shaped sliding mouths on the slide rail, weld an installation plate to the bottom of the inverted π-shaped steel base plate, open several installation plate strip-shaped sliding mouths on the installation plate, and open bolt holes on the tie rod connecting plates respectively. All of the above work is prefabricated in the factory.

[0016] Step 2: Template Installation: First, apply an unbonded plastic film tightly to the pouring side surface of the template body and evenly apply a release agent. Lay it flat and let it stand for the specified time. Next, slide the slide rail and the mounting plate laterally. Push the slide rail inward and adjust its position so that it is placed at the corresponding design position on the top of the mounting plate. Install several fastening screws I into several slide rail strip openings and several mounting plate strip openings to fix the slide rail and the mounting plate. Then, slide the template body and the slide rail longitudinally. Push the template body to the corresponding design position. Insert several limiting blocks into several template limiting holes and several slide rail limiting holes to fix the template body and the slide rail. Finally, fix one end of several horizontal tie rods and several diagonal tie rods to several template connecting plates with several fastening screws II. Fix the other end of several horizontal tie rods and several diagonal tie rods to the precast bridge deck with several expansion screws to complete the installation of the entire template.

[0017] Step 3: Template disassembly: First, remove the expansion screws used to fix several horizontal tie rods to the precast bridge panel and several diagonal tie rods to the precast bridge panel. Then, remove the limiting blocks used to fix the slide rail to the template body and push the template body to the next installation position. Finally, remove the fastening screws I used to fix the slide rail to the mounting plate and remove the slide rail to the next installation position.

[0018] Compared with the prior art, the beneficial effects of the formwork and construction method for concrete pouring of concrete slab-steel truss composite beams described in this invention are:

[0019] (1) The sliding formwork system proposed in this invention has excellent load-bearing capacity and lateral stiffness. The top of the formwork body is reliably connected to the precast concrete slab through several truss-type connecting rods, and the bottom of the formwork body is reliably connected to the inverted π-shaped steel base plate through sliding rails and limiting holes. Several longitudinal and vertical stiffening ribs are arranged on the outer surface of the formwork body. These three parts of the structure can significantly increase the load-bearing capacity and lateral stiffness of the sliding formwork system and meet the construction requirements.

[0020] (2) The sliding formwork system proposed in this invention has flexible layout and construction methods. Several truss-type connecting rods, formwork connecting plates and expansion bolts can be flexibly arranged according to construction requirements, and the truss-type connecting rods have length adjustment function to realize the flexibility of the upper part of the formwork body; the geometric dimensions and spatial positions of the formwork body, longitudinal stiffening ribs and vertical stiffening ribs can be flexibly designed according to construction requirements to realize the flexibility of the lateral bearing capacity and stiffness design of the formwork body; the mounting plate, slide rail, strip sliding mouth and limiting hole can be flexibly arranged according to construction requirements, so that the layout and construction methods of the lower part of the formwork body are flexible.

[0021] (3) The sliding formwork system proposed in this invention has high construction efficiency. After the sliding formwork system is installed according to the design, concrete can be poured by inserting the limiting blocks. After construction is completed, the expansion screws and limiting blocks are removed, and the formwork body can slide along the slide rail to enter the next segment. The entire construction process is simple to operate and has extremely high construction efficiency.

[0022] (4) The sliding formwork system proposed in this invention is entirely made of steel and can be reused repeatedly. After construction is completed, the sliding formwork system can be completely dismantled and reused repeatedly; since the truss connection length, the position of the limiting hole, and the position of the strip sliding opening are adjustable, one set of sliding formwork system can serve multiple similar engineering projects, which has the design concept of saving resources and sustainable development. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 This is a front view of the overall structure described in this invention patent;

[0025] Figure 2 This is the right view of the overall structure.

[0026] Figure 3 This is a schematic diagram of the connection structure between the template body and the slide rail;

[0027] Figure 4 This is a schematic diagram of the connection structure between the slide rail and the mounting plate.

[0028] Figure 5 This is a schematic diagram of the mounting plate component.

[0029] Figure 6 This is a schematic diagram of the aforementioned transverse tie rod (diagonal tie rod) component;

[0030] Figure 7 This is a schematic diagram of the longitudinal wet joint of a concrete slab-steel truss composite beam.

[0031] The figure shows: 1-Formwork body; 1a-Formwork limiting hole; 2-Longitudinal stiffening rib; 3-Vertical stiffening rib; 4-Formwork connecting plate; 4a-Connecting plate bolt hole; 5-Slide rail; 5a-Slide rail limiting hole; 5b-Slide rail strip opening; 5c-Protruding rib; 6-Limiting block; 7-Mounting plate; 7a-Mounting plate strip opening; 7b-Groove; 8-Fastening screw I; 9-Horizontal tie rod; 10-Diagonal tie rod; 11-Tie rod connecting plate; 11a-Bolt hole; 12-Telescopic rod; 13-Adjusting screw; 14-Inverted π-shaped steel base plate; 15-Precast bridge deck; 16-Expansion screw; 17-Fastening screw II; 18-Longitudinal wet joint. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0033] See Figure 1-7 This embodiment describes a formwork for concrete pouring of a concrete slab-steel truss composite beam, comprising a formwork body 1, several longitudinal stiffening ribs 2, several vertical stiffening ribs 3, several formwork connecting plates 4, a slide rail 5, a limiting block 6, an mounting plate 7, several fastening screws I 8, several transverse tie rods 9, several diagonal tie rods 10, several expansion screws 16, and several fastening screws II 17. Several formwork connecting plates 4 are welded and fixed to the top of the formwork body 1. The bottom of the formwork body 1 is longitudinally slidably connected to the top of the slide rail 5. Several longitudinal stiffening ribs 2 and several vertical stiffening ribs 3 are welded to one side of the formwork body 1. An mounting plate 7 is installed at the bottom of an inverted π-shaped steel base plate 14. The bottom of the slide rail 5 is transversely slidably connected to the top of the mounting plate 7. One end of several transverse tie rods 9 and several diagonal tie rods 10 are respectively connected to several formwork connecting plates 4 by several fastening screws II 17. The other end of several transverse tie rods 9 and several diagonal tie rods 10 are respectively connected to a precast bridge deck 15 by several expansion screws 16.

[0034] The upper part of the template body 1 is reliably connected to the precast bridge deck 15 through several truss-type tie rods, and the lower part of the template body 1 is reliably connected to the inverted π-shaped steel base plate 14 through the connecting and fixing slide rail 5. Several longitudinal stiffening ribs 2 and vertical stiffening ribs 3 are arranged on the outer surface of the template body 1. These three parts of the structure can significantly increase the load-bearing capacity and lateral stiffness of the sliding template system.

[0035] Several truss-type tie rods, formwork connecting plates 4, slide rails 5, etc. can be flexibly arranged according to construction needs, and the truss-type tie rods (horizontal tie rods 9 and diagonal tie rods 10) have length adjustment functions, and the formwork body 1 has good flexibility.

[0036] The template body 1 and the slide rail 5 are respectively provided with a number of template limiting holes 1a and a number of slide rail limiting holes 5a. The relative positions of the template body 1 and the slide rail 5 are fixed by a number of limiting blocks 6 inserted into the template limiting holes 1a and the slide rail limiting holes 5a. The slide rail 5 and the mounting plate 7 are respectively provided with a number of slide rail strip-shaped sliding openings 5b and a number of mounting plate strip-shaped sliding openings 7a. The relative positions of the slide rail 5 and the mounting plate 7 are fixed by a number of fastening screws I8 installed in the slide rail strip-shaped sliding openings 5b and the mounting plate strip-shaped sliding openings 7a.

[0037] The dimensions and opening positions of the plurality of template limiting holes 1a, the plurality of slide rail limiting holes 5a, the plurality of slide rail strip-shaped sliding openings 5b, and the plurality of mounting plate strip-shaped sliding openings 7a are respectively matched with each other to form through holes after installation. This setting ensures the smooth installation of the plurality of limiting blocks 6 and the plurality of fastening screws I8.

[0038] The plurality of template limiting holes 1a and the plurality of slide rail limiting holes 5a can be provided with no fewer than two holes along the longitudinal length direction as required. This arrangement ensures the connection quality between the template body 1 and the slide rail 5 and prevents the template body from moving during use.

[0039] The lateral sliding connection between the slide rail 5 and the mounting plate 7 consists of a protruding rib 5c and a groove 7b, with the dimensions of the protruding rib 5c and the groove 7b fitting together. This design ensures quick positioning during slide rail installation and restricts longitudinal relative movement between the slide rail 5 and the mounting plate 7.

[0040] The rib 5c is solid in one section near the inner side of the casting, and hollow in the other. This design ensures that the slide rail 5 can support the template body 1 while minimizing material usage.

[0041] The connection point between the template body 1 and the template connecting plate 4 is at the intersection of the longitudinal stiffening rib 2 and the vertical stiffening rib 3. This arrangement strengthens the stress concentration area of ​​the template body and prevents excessive stress concentration or local deformation of the template body.

[0042] The horizontal tie rod 9 and the diagonal tie rod 10 have the same structure. The horizontal tie rod 9 includes two tie rod connecting plates 11, two telescopic rods 12 and an adjusting screw 13. The tie rod connecting plate 11, the telescopic rod 12, the adjusting screw 13, the other telescopic rod 12 and the other tie rod connecting plate 11 are connected in sequence.

[0043] An adjusting screw 13 is threaded between the two telescopic rods 12, and the adjusting screw 13 has positive and negative thread structures at both ends. The movement of the telescopic rods 12 can be controlled by rotating the adjusting screw 13, thereby allowing the lengths of several horizontal tie rods 9 and diagonal tie rods 10 to be adjusted within a certain range.

[0044] At least one diagonal tie rod 10 is provided between adjacent transverse tie rods 9 to form a Z-shape. This arrangement ensures sufficient structural stability of the template body during use.

[0045] The construction method for the sliding formwork used in the on-site casting of concrete slab-steel truss composite beams is as follows:

[0046] Step 1: Prefabrication: Weld several template connecting plates 4 to the top of the template body 1, weld several longitudinal stiffening ribs 2 and several vertical stiffening ribs 3 to one side of the template body 1, open several template limiting holes 1a on the template body 1, open several connecting plate bolt holes 4a on several template connecting plates 4, open several slide rail limiting holes 5a and several slide rail strip-shaped sliding mouths 5b on the slide rail 5, weld the mounting plate 7 to the bottom of the inverted π-shaped steel base plate 14, open several mounting plate strip-shaped sliding mouths 7a on the mounting plate 7, and open bolt holes 11a on the tie rod connecting plate 11 respectively. The above work is prefabricated in the factory.

[0047] Step 2: Template Installation: First, firmly attach the unbonded plastic film to the pouring side surface of the template body 1 and evenly apply a release agent. Lay it flat and let it stand for the specified time. Next, slide the slide rail 5 and the mounting plate 7 laterally. Push the slide rail 5 inward and adjust its position so that it is placed at the corresponding design position on the top of the mounting plate 7. Install several fastening screws I8 into several slide rail strip openings 5b and several mounting plate strip openings 7a to complete the fixing of the slide rail 5 and the mounting plate 7. Then, connect the template body 1 and the slide rail 5 longitudinally. The template body 1 is pushed to the corresponding design position by sliding connection. Several limiting blocks 6 are inserted into several template limiting holes 1a and several slide rail limiting holes 5a to fix the template body 1 to the slide rail 5. Finally, several horizontal tie rods 9 and several diagonal tie rods 10 are fixed to several template connecting plates 4 by several fastening screws II 17. The other ends of several horizontal tie rods 9 and several diagonal tie rods 10 are fixed to the precast bridge panel 15 by several expansion screws 16 to complete the installation of the entire template.

[0048] Step 3: Template disassembly: First, disassemble several expansion screws 16 used to fix several horizontal tie rods 9 to the precast bridge panel 15 and several diagonal tie rods 10 to the precast bridge panel 15. Then, remove several limiting blocks 6 used to fix the slide rail 5 to the template body 1, and push the template body 1 to the next installation position. Finally, disassemble several fastening screws I8 used to fix the slide rail 5 to the mounting plate 7, and remove the slide rail 5 to the next installation position.

[0049] After the sliding template system is installed according to the design, the limiting block 6 can be inserted to pour concrete. After the construction is completed, the expansion screws 16 and the limiting block 6 are removed, and the template body 1 can slide along the slide rail 5 to enter the next section. The whole construction process is simple to operate and has extremely high construction efficiency.

[0050] After construction is completed, the sliding formwork system can be completely dismantled and reused repeatedly. Because the truss connection length, the position of the limiting hole, and the position of the strip sliding opening are adjustable, one set of sliding formwork system can serve multiple similar engineering projects. It has the design concept of saving resources and sustainable development, and has solved the problem of formwork support on the free side of the longitudinal wet joint of concrete slab-steel truss composite beam.

[0051] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A construction method for a formwork for concrete casting of a concrete slab-steel truss composite beam, characterized by, Specifically comprising the following steps: Step 1: prefabrication work: welding a plurality of template connecting plates (4) on the top of the template body (1), welding a plurality of longitudinal stiffening ribs (2) and a plurality of vertical stiffening ribs (3) on one side of the template body (1), opening a plurality of template limiting holes (1a) on the template body (1), opening a plurality of connecting plate bolt holes (4a) on a plurality of template connecting plates (4), opening a plurality of slide rail limiting holes (5a) and a plurality of slide rail strip sliding openings (5b) on the slide rail (5), welding the mounting plate (7) on the bottom of the inverted π-shaped steel bottom plate (14), opening a plurality of mounting plate strip sliding openings (7a) on the mounting plate (7), opening bolt holes (11a) on the pull rod connecting plate (11), and the above work is prefabricated in the factory; Step 2: template installation: first, the template body (1) pouring side surface is closely attached to the non-bonding plastic film and evenly brushed with release agent, laid flat, and placed for a specified period of time, second, the slide rail (5) and the mounting plate (7) are transversely slidably connected, the slide rail (5) is pushed inward and the position is adjusted, so that it is placed on the top of the mounting plate (7) at the corresponding design position, a plurality of fastening screws I (8) are installed in a plurality of slide rail strip sliding openings (5b) and a plurality of mounting plate strip sliding openings (7a), the fixing of the slide rail (5) and the mounting plate (7) is completed, then, the template body (1) and the slide rail (5) are longitudinally slidably connected, the template body (1) is pushed to the corresponding design position, a plurality of limiting blocks (6) are inserted into a plurality of template limiting holes (1a) and a plurality of slide rail limiting holes (5a), the fixing of the template body (1) and the slide rail (5) is completed, finally, the one end of a plurality of transverse pull rods (9), a plurality of inclined pull rods (10) are fixed with a plurality of template connecting plates (4) through a plurality of fastening screws II (17), the other end of a plurality of transverse pull rods (9), a plurality of inclined pull rods (10) are fixed with a prefabricated bridge deck (15) through a plurality of expansion screws (16), the installation of the whole template is completed; Step 3: template disassembly: first, disassemble the expansion screws (16) for fixing the plurality of transverse pull rods (9) and the prefabricated bridge deck (15), the plurality of inclined pull rods (10) and the prefabricated bridge deck (15), then, remove the limiting blocks (6) for fixing the slide rail (5) and the template body (1), push the template body (1) to the next installation position, finally, disassemble the fastening screws I (8) for fixing the slide rail (5) and the mounting plate (7), and remove the slide rail (5) to the next installation position.

2. A form for use in the construction method for the concreting of a concrete slab-steel truss composite beam according to claim 1, characterized in that: It comprises a template body (1), a plurality of longitudinal stiffening ribs (2), a plurality of vertical stiffening ribs (3), a plurality of template connecting plates (4), a slide rail (5), a limiting block (6), a mounting plate (7), a plurality of transverse pull rods (9), a plurality of inclined pull rods (10), an inverted π-shaped steel bottom plate (14) and a prefabricated bridge deck (15). The top of the template body (1) is welded with several template connecting plates (4), the bottom of the template body (1) is longitudinally slidably connected with the top of the slide rail (5), several longitudinal stiffening ribs (2) and several vertical stiffening ribs (3) are welded on one side of the template body (1), the several longitudinal stiffening ribs (2) and the several vertical stiffening ribs (3) are vertically arranged, the bottom of the inverted π-shaped steel bottom plate (14) is provided with a mounting plate (7), the bottom of the slide rail (5) is transversely slidably connected with the top of the mounting plate (7), the transverse pull rod (9) and the inclined pull rod (10) are connected with the template connecting plate (4) and the prefabricated bridge deck (15), one end of the transverse pull rod (9) and the inclined pull rod (10) is connected with the several template connecting plates (4), and the other end is connected with the prefabricated bridge deck (15).

3. The form for concrete casting of a concrete slab-steel truss composite beam according to the construction method of claim 2, characterized by: The side of the template body (1) is provided with several template limiting holes (1a), the side of the slide rail (5) is provided with several slide rail limiting holes (5a), and the relative positions of the template body (1) and the slide rail (5) are fixed by inserting the limiting clamping blocks (6) in the several template limiting holes (1a) and the several slide rail limiting holes (5a).

4. The form for concrete casting of a concrete slab-steel truss composite beam according to the construction method of claim 3, characterized by: The slide rail (5) is provided with several slide rail strip sliding openings (5b), and the mounting plate (7) is provided with several mounting plate strip sliding openings (7a), and the relative positions of the slide rail (5) and the mounting plate (7) are fixed by the fastening screws I (8) installed in the several slide rail strip sliding openings (5b) and the several mounting plate strip sliding openings (7a).

5. The form for concrete casting of concrete slab-steel truss composite beams according to the construction method of claim 4, characterized in that: The sizes and hole positions of the template limiting hole (1a), the slide rail limiting hole (5a), the slide rail strip sliding opening (5b) and the mounting plate strip sliding opening (7a) are matched with each other, and a through hole can be formed after installation.

6. The form for concrete casting of concrete slab-steel truss composite beams according to the construction method of claim 4, characterized in that: The slide rail (5) is provided with a convex rib (5c), and the mounting plate (7) is provided with a groove (7b), and the sizes of the convex rib (5c) and the groove (7b) are matched with each other.

7. The form for concrete placement for concrete slab-steel truss composite beam according to claim 2, wherein: The connection position of the template body (1) and the template connecting plate (4) is the intersection of the longitudinal stiffening rib (2) and the vertical stiffening rib (3).

8. The form for concrete placement for concrete slab-steel truss composite beam according to the construction method of claim 2, characterized in that: The transverse pull rod (9) and the inclined pull rod (10) are the same in structure, the transverse pull rod (9) comprises two pull rod connecting plates (11), two telescopic rods (12) and an adjusting screw rod (13), and the pull rod connecting plate (11), the telescopic rod (12), the adjusting screw rod (13), the other telescopic rod (12) and the other pull rod connecting plate (11) are sequentially connected.

9. The form for concrete placement for concrete slab-steel truss composite beam according to the construction method of claim 6, characterized in that: The adjusting screw rod (13) is threadedly connected between the two telescopic rods (12), and the adjusting screw rod (13) is provided with positive and negative tooth structures at both ends.

10. The form for concrete placement for concrete slab-steel truss composite beam according to the construction method of claim 2, characterized in that: At least one inclined pull rod (10) is arranged between adjacent transverse pull rods (9), forming a Z shape.

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