CN108643558A - The type steel bar truss floor support plate and construction method of the detachable end template of welded type - Google Patents

Abstract

The invention discloses an assembled steel bar truss floor bearing plate and a construction method of a welded detachable bottom formwork, including a square bottom formwork, connecting pads and several steel bar trusses with unit triangular sections, the connecting pads are strip-shaped, and the connecting pads There are also two supporting grooves symmetrically arranged on the upper surface, and blind holes are symmetrically opened on the lower surface of both ends of the connecting pad; holes for passing through screws are arranged on the bottom formwork, and the screws are screwed in from the lower surface of the bottom formwork and pass through the holes upwards Screw the connection pad to the bottom formwork; there are at least two sets of steel bar trusses with unit triangular section and arranged in parallel at intervals; The clamping position of the steel bar and the support groove is welded and fixed. The structure is simple, the design is reasonable, the manufacture is convenient, the man-hour is saved, the construction cost is reduced, and the efficiency is improved, and it is stable and reliable during use. It is convenient for workers to remove the bottom formwork after the concrete pouring construction is completed.

Description

Assembled reinforced truss floor deck with welded detachable bottom formwork and construction method

technical field

The invention relates to the field of building components, in particular to an assembled reinforced truss floor bearing plate of a welded detachable bottom formwork and a construction method.

Background technique

Reinforced truss floor deck is a building product in which the reinforced steel bars in the floor are welded into reinforced trusses in the factory, and the reinforced trusses are fixedly connected with the bottom formwork to form the integration of the bottom formwork and the stressed steel bars. During construction, the reinforced truss floor deck is fixed between two load-bearing beams, and concrete is poured directly. The bottom formwork bears the gravity of the concrete, and the steel truss provides unsupported stiffness for the bottom formwork. Compared with the traditional floor slab that supports the concrete through the bottom formwork, the reinforced truss floor slab speeds up the construction progress and enhances the supporting effect.

In order to enable the bottom formwork after pouring to be recycled. In the prior art, the connecting pads of the detachable bottom formwork steel bar truss floor deck are plastic fasteners, and the connection mode with the lower chord steel bar of the steel bar truss is embedded, and the embedded point must be guaranteed to be the lower part of the connection node between the upper chord of the steel bar truss and the web bar. On the lower chord reinforcement, although the connecting fasteners realize the detachable connection between the steel truss and the bottom formwork, there are many factors that affect the connection, for example: the plastic fasteners are not completely buckled in; the plastic fasteners have not reached 100% strength , the prior art assembly process fails to achieve full automation. Because the bottom plate of the existing detachable bottom formwork reinforced truss floor deck is wood formwork, bamboo plywood or engineering plastic plate, so there is still a fire hazard at the construction site.

Contents of the invention

The purpose of the present invention is to provide an assembled reinforced truss floor slab and a construction method of a welded detachable bottom formwork, to solve the problem that the bottom formwork cannot be recycled and reused after the steel truss floor slab is constructed; Not enough, a technical problem with a weak connection.

To achieve the above object, the present invention adopts the following technical solutions:

One aspect of the present invention provides an assembled reinforced truss floor deck of a welded detachable bottom formwork, including a square bottom formwork, connecting pads and several steel bar trusses with a triangular section, the connecting pads are strip-shaped, and the connecting pads There are also two supporting grooves symmetrically arranged on the upper surface of the part, and blind holes are symmetrically opened on the lower surface of both ends of the connecting pad; the bottom formwork is provided with holes for passing through screws, and the screws are screwed in from the lower surface of the bottom formwork and passed out upwards. The hole connects the connection pad with the bottom template threadedly;

There are at least two groups of steel bar trusses with unit triangular section and they are arranged in parallel and at intervals. The steel bar trusses with unit triangular section include one upper chord steel bar, two lower chord steel bars and two web bar bars bent in a triangular wave shape. The web bar bar bars are symmetrically welded on Between the lower chord reinforcement and the upper chord reinforcement;

The two lower chord steel bars of the unit triangular cross-section steel truss are clamped respectively in the two supporting grooves of the connecting pad, and the clamping positions of the lower chord steel bars and the supporting grooves are welded and fixed.

Further, the distance between the two supporting grooves is adapted to the spacing between the two lower chord steel bars of the unit triangular section steel bar truss.

Further, the depth of the supporting groove is adapted to the diameter of the lower chord steel bar.

Further, the steel bar truss with unit triangular section also includes two support horizontal steel bars and two support vertical steel bars, and the support horizontal steel bars are arranged symmetrically at the bottom of both ends of the lower chord steel bar and parallel to the strip-shaped connecting pads; the support The connection nodes between the upper part of the vertical reinforcement of the seat and the upper chord reinforcement and the web reinforcement are welded and fixed, and the lower part of the vertical reinforcement of the support is welded and fixed with the horizontal reinforcement of the support.

Further, the diameter of the horizontal steel bar of the support is smaller than or equal to the height of the strip-shaped connecting pad.

Further, gaskets are also provided between the screws and the bottom template.

Further, the bottom formwork is one of metal board, bamboo plywood, wood plywood and resin plastic board.

Further, the metal plate is a galvanized plate or a galvanized checkered steel plate, the surface of which is flat or provided with protrusions; the holes for penetrating screws are provided on the protrusions.

Further, the convex portion is a bump or a raised line.

Further, at least three connection pads are arranged in parallel at the lower part of the steel bar truss with triangular section.

Further, the connecting pad is made of steel, with a thickness of 15mm-30mm.

Another aspect of the present invention adopts the construction method of the assembled reinforced truss floor deck of the above-mentioned welded detachable bottom formwork, and the specific steps are as follows:

Step 1: Prepare materials in the factory according to construction requirements;

Step 2, cutting the bottom formwork, making unit triangular cross-section steel trusses, making strip-shaped connecting pads and punching holes at both ends of the connecting pads;

Step 3: snap the lower chord steel bars of the unit triangular cross-section steel bar truss into the supporting groove of the connecting pad, and then weld the contact position between the lower chord steel bar and the supporting groove firmly; check the stability of the structure online;

Step 4, according to the length of the steel bar truss with triangular section of the unit, a plurality of connection pads can be arranged at its lower part;

Step 5, connect and fix the connecting pad and the bottom formwork by screws;

Step 6, transport the assembled reinforced truss floor deck products to the construction site, brush the release agent and pour them for use;

Step 7, after the initial setting of the concrete, remove the bottom formwork and recycle it.

The beneficial effects of the present invention are reflected in:

1. The assembled reinforced truss floor deck of welded detachable bottom formwork provided by the present invention has simple structure, reasonable design and convenient manufacture. Screws are screwed in from the lower surface of the bottom formwork and pass through the holes upward to fix the connecting pad and the bottom formwork. At the same time, pads are added between the screws and the bottom formwork to effectively prevent leakage at the opening. And it is convenient for workers to remove the bottom formwork after the concrete pouring construction is completed.

2. The supporting groove with the same interval as the two lower chord steel bars is set on the connecting pad, and the lower chord steel bar and the connecting pad are further fixed by welding, so that the connection method is firm and reliable.

3. The assembled reinforced truss floor deck of the welded detachable bottom formwork provided by the present invention, the unit triangular section steel truss can be arranged according to the actual construction requirements, and the connecting pad can be welded at any position of the lower chord steel, which is flexible and convenient. Multiple triangular cross-section steel trusses have the same length, and there are no other requirements for the beginning of the truss.

4. The assembled steel truss floor deck and construction method of the welded detachable bottom formwork provided by the present invention, the assembled steel truss floor deck is prefabricated in the factory and delivered to the construction site, and the construction process is simple and convenient. The working hours are saved, the construction cost is reduced, and the efficiency is improved. It has high promotion value and can be widely used in the construction process of the assembled reinforced truss floor deck with detachable bottom formwork.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The main objectives and other advantages of the invention will be realized and obtained by the aspects particularly pointed out in the written description and claims.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of the elevation structure of Embodiment 1 of the present invention.

Fig. 2 is a side view of the embodiment of the present invention.

Fig. 3 is a schematic side view of the second embodiment of the present invention.

Fig. 4 is a top view of Embodiment 3 of the present invention.

Reference signs: 11-rebar truss, 12-connecting pad, 13-screw, 14-bottom formwork, 15-supporting groove, 16-convex part, 17-top chord reinforcement, 18-bottom chord reinforcement, 19-web reinforcement , 20-support vertical reinforcement, 21-support horizontal reinforcement.

Detailed ways

The technical solutions of the present invention are described in detail below through the examples, and the following examples are only exemplary, and can only be used to explain and illustrate the technical solutions of the present invention, but cannot be construed as limitations to the technical solutions of the present invention.

Example 1

As shown in Fig. 1 and Fig. 2, one aspect of the present invention provides a kind of structure is simple, the design is reasonable, the fabrication type steel bar truss floor deck of the welded detachable bottom formwork that is convenient to manufacture, comprises square flat bottom formwork 14, connecting The pad 12 and several steel bar trusses 11 with unit triangular section, the connection pad 12 may be a strip-shaped steel block with a thickness of 15mm-30mm. Blind holes are symmetrically opened on the lower surface of both ends of the connecting pad 12, and the screws 13 are screwed in from the lower surface of the bottom formwork 14 and passed through the holes upward to fix the connecting pad 12 and the bottom formwork 14, so that after the concrete pouring construction is completed, workers Carry out bottom formwork 14 removal operations. A gasket is also arranged between the screw 13 and the bottom template 14, which can effectively prevent leakage at the opening. Two support grooves 15 are symmetrically arranged on the upper surface of the connection pad 12 .

The steel bar trusses 11 with unit triangular section can be arranged in parallel at intervals. The steel bar truss 11 with unit triangular section includes an upper chord steel bar 17, two lower chord steel bars 18 and two web bar bars 19 bent in a triangular wave shape. The web bar bars 19 Respectively symmetrically welded between the lower chord reinforcement 18 and the upper chord reinforcement 17. The two lower chord steel bars 18 of the unit triangular cross-section steel truss 11 are clamped respectively in the two supporting grooves 15 of the connecting pad 12, and the clamping positions of the lower chord steel bars 18 and the supporting grooves 15 are welded and fixed, so that the connection method is firm reliable. The distance between the two supporting grooves 15 is adapted to the distance between the two lower chord steel bars 18 of the unit triangular section steel bar truss 11 . The depth of supporting groove 15 is adapted to 18 diameters of lower chord reinforcement.

At least three connection pads 12 are arranged in parallel on the lower part of the steel bar truss 11 with unit triangular section. The number of connecting pads 12 is flexible and can also be adjusted as required. The connecting pads 12 can be arranged in parallel and at intervals, and the intervals can be the same or different.

The steel bar truss 11 with unit triangular section can also include two support horizontal steel bars 21 and two support vertical steel bars 20, the support horizontal steel bars 21 are symmetrically arranged at the lower part of the two ends of the lower chord steel bar 18, and the strip-shaped connecting pads 12 Parallel; the upper part of the vertical reinforcement 20 of the support is welded and fixed with the connection node of the upper chord reinforcement 17 and the web reinforcement 19, and the lower part of the vertical reinforcement 20 of the support is welded and fixed with the horizontal reinforcement 21 of the support. The diameter of the support horizontal reinforcing bar 21 is less than or equal to the height of the elongated connecting pad 12 .

The bottom template 14 can be one of bamboo plywood, wood plywood, resin plastic plywood, self-insulation floor, non-demolition bottom formwork floor, and decorative non-demolition floor. Wherein, the thickness of the bamboo plywood or wood plywood is 15mm-25mm; the thickness of the resin plastic board is 12mm-25mm. Among them, the self-insulation floor slab can be made of materials with thermal insulation function; the non-demolition bottom formwork floor can be a floor slab without plastering on the bottom surface; the decorative non-demolition floor slab is a floor slab with a decorative function.

The construction method of the assembled reinforced truss floor deck using a welded detachable bottom formwork is as follows:

Step 1: Prepare materials in the factory according to construction requirements;

Step 2, cutting the bottom template 14, making the unit triangular cross-section steel bar truss 11, making a strip-shaped connecting pad 12 and punching holes at the two ends of the connecting pad 12;

Step 3: snap the lower chord steel bars 18 of the unit triangular cross-section steel bar truss 11 into the support groove 15 of the connection pad 12, and then weld the contact position of the lower chord steel bars 18 and the support groove 15 firmly; check the stability of the structure online;

Step 4, according to the length of the steel bar truss 11 with unit triangular section, a plurality of connection pads 12 can be arranged at its lower part;

Step 5, connecting and fixing the connection pad 12 and the bottom template 14 with screws 13;

Step 6, transport the 11th-floor bearing plate products of the unit triangular cross-section reinforced truss to the construction site, brush the release agent and pour it for use;

Step 7, after the initial setting of the concrete, the bottom template 14 is removed and recycled.

After pouring the concrete, under the action of concrete gravity, although there is a reverse movement trend between the two lower chord steel bars 18, and two outward thrusts with the same magnitude and opposite directions are formed, but for each connecting pad 12 That is to say, two thrusts of the same magnitude and opposite directions acting on it at the same time cancel each other out. Therefore, these two thrusts will not be transmitted to the bottom template 14 through the connection pad 12 to cause tensile deformation of the bottom template 14, which will affect the supporting effect, and will not cause the screws 13 connecting the bottom template 14 and the connection pad 12 to bear The shearing force will cause difficulties for subsequent disassembly, and there will be no hidden dangers in the connection between the screw 13 and the connection pad 12 due to the material strength of the connection pad 12 .

In step 2, the steel bar trusses 11 with unit triangular section can be arranged according to actual construction requirements, and the connecting pads 12 can be welded at any position of the lower chord steel bars 18, which is flexible and convenient. Multiple unit triangular cross-section steel bar trusses 11 have the same length, and there is no other requirement for the beginning end of the trusses.

Example 2

As shown in Figure 3, the assembled reinforced truss floor deck of the welded detachable bottom formwork and its construction method are the same as in Embodiment 1, the difference is that when the bottom formwork 14 is a galvanized plate or a galvanized checkered steel plate or the like For the metal plate, the thickness of galvanized plate or galvanized checkered steel plate is 0.5mm-2mm. The convex portion 16 may be pre-pressed on the metal plate, and the hole for passing through the screw 13 is provided on the convex portion 16 . The convex portion 16 may be a bump or a raised line.

The benefits of pressing out the concave blocks or concave strips on the metal plate in advance are: 1. The metal bottom formwork 14 can be reused after recovery, which is convenient for workers to apply putty on the metal bottom formwork 14 later; 2. With concave blocks or concave strips After the metal plate is recycled, it can be reused after being coated with putty, which can be better used with reinforced concrete, increasing the contact area, thereby increasing the amount of concrete filled, and has the effect of rust prevention.

Example 3

As shown in Figure 4, the assembled reinforced truss floor deck of the welded detachable bottom formwork and its construction method are the same as in Embodiment 1, the difference is that the lower surfaces of the two ends of the connecting pad 12 are symmetrically provided with penetration screws 13 The screw 13 is screwed in by the lower surface of the bottom template 14 and passes through the hole to connect the pad 12 with the bottom template 14. The upper surface of the pad 12 can be further fixed with a nut.

The assembled reinforced truss floor deck of the welded detachable bottom formwork and the construction method provided by the present invention, the 11th floor deck of the assembled reinforced truss is prefabricated in the factory and delivered to the construction site, and the construction process is simple and convenient. It saves man-hours of man-hours, reduces construction costs and improves efficiency. It has high promotional value.

The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any changes or substitutions conceived by those skilled in the art within the technical scope disclosed in the present invention will be accepted. Should be covered within the protection scope of the present invention.

Claims (10)

1. Assembled steel truss floor deck with welded detachable bottom formwork, characterized in that it includes square bottom formwork (14), connection pads (12) and several unit triangular section steel trusses (11), the connection The pad (12) is in the shape of a long strip, and the upper surface of the connecting pad (12) is symmetrically provided with two supporting grooves (15), and the lower surface of both ends of the connecting pad (12) is symmetrically provided with blind holes; the bottom formwork ( 14) There are holes for passing through the screws (13), and the screws (13) are screwed in from the lower surface of the bottom template (14) and pass through the holes upwards to thread the connection pad (12) and the bottom template (14); There are at least two sets of steel bar trusses (11) with unit triangular section arranged in parallel and at intervals. The steel bar trusses (11) with unit triangular section include one upper chord steel bar (17), two lower chord steel bars (18) and two triangular wavy curved webs. Rod reinforcement (19), the web reinforcement (19) is respectively symmetrically welded between the lower chord reinforcement (18) and the upper chord reinforcement (17); The two lower chord steel bars (18) of the unit triangular cross-section steel truss (11) are clamped respectively in the two supporting grooves (15) of the connecting pad (12), and the lower chord steel bars (18) and the supporting grooves (15) ) The clamping position is welded and fixed. 2. The assembled steel truss floor deck of welded detachable bottom formwork according to claim 1, characterized in that the distance between the two support grooves (15) is the same as the distance between the unit triangular section steel truss (11) The spacing of two lower chord reinforcing bars (18) is suitable. 3. The fabricated reinforced truss floor deck of a welded detachable bottom formwork according to claim 1, characterized in that the depth of the support groove (15) is adapted to the diameter of the lower chord steel bar (18). 4. The fabricated reinforced truss floor deck of a welded detachable bottom formwork according to claim 1, characterized in that the unit triangular cross-section reinforced truss (11) also includes two support horizontal reinforcements (21) and two The vertical steel bar (20) of the support, the horizontal steel bar (21) of the support is symmetrically arranged at the lower part of both ends of the lower chord steel bar (18), parallel to the strip-shaped connecting pad (12); the vertical steel bar of the support (20 ) upper part and the connection node of the upper chord reinforcement (17) and the web reinforcement (19) are welded and fixed, and the lower part of the support vertical reinforcement (20) is welded and fixed with the support horizontal reinforcement (21). 5. The assembled reinforced truss floor deck of a welded detachable bottom formwork according to claim 4, characterized in that the diameter of the support horizontal reinforcement (21) is less than or equal to the diameter of the strip-shaped connecting pad (12). high. 6. The assembled reinforced truss floor deck of a welded detachable bottom formwork according to claim 1, characterized in that there is a gasket between the screw (13) and the bottom formwork (14). 7. The fabricated reinforced truss floor deck of a welded detachable bottom formwork according to claim 1, characterized in that the bottom formwork (14) is a metal plate, a bamboo plywood, a wood plywood, or a resin plastic plywood One of. 8. The fabricated reinforced truss floor deck of welded detachable bottom formwork according to claim 7, characterized in that the metal plate is a galvanized plate or a galvanized checkered steel plate, and its surface is flat or provided with convex parts (16 ); the holes for passing through the screws (13) are provided on the protrusions (16). 9. The assembled reinforced truss floor deck of a welded detachable bottom formwork according to claim 8, characterized in that, the convex part (16) is a convex block or a convex line. 10. The construction method of the assembled reinforced truss floor deck of the welded detachable bottom formwork according to any one of claims 1-9, wherein the specific steps of the construction method are as follows: Step 1: Prepare materials in the factory according to construction requirements; Step 2, cutting the bottom formwork (14), making unit triangular cross-section steel trusses (11), making strip-shaped connecting pads (12) and punching holes at both ends of the connecting pads (12); Step 3, snap the lower chord steel bars (18) of the unit triangular cross-section steel bar truss (11) into the supporting groove (15) of the connection pad (12), and then insert the lower chord steel bar (18) and the supporting groove (15) The contact position is firmly welded; the stability of the structure is detected online; Step 4, according to the length of the steel bar truss (11) with unit triangular section, a plurality of connection pads (12) can be arranged at its lower part; Step 5, connect and fix the connecting pad (12) and the bottom template (14) through screws (13); Step 6, transport the assembled steel truss (11) floor bearing plate products to the construction site, brush the release agent and pour it for use; Step seven, after the initial setting of the concrete, the bottom template (14) is removed and recovered.