A new construction method for steel structure floor deck

Abstract

The present invention relates to a new type of construction method for steel structure floor deck, including: a bottom form, a bottom form recycling type steel truss floor deck clamp structure and a one-time casting molding structure for high-precision cast-in-place floor without leveling; including the steps of: making the steel truss of the floor deck, making the bottom form, and opening holes in the bottom form; assembling the bottom form recycling type steel truss floor deck clamp structure, setting and the one-time casting molding structure for high-precision cast-in-place floor without leveling above the steel truss of the floor deck, casting the floor deck, and recycling the external clamp and the connection hole blocking component. The beneficial effects of the present invention are: the bottom form and the steel bar realize the stable connection between the steel truss and the bottom form through the detachable clamp, and the bottom form can be recycled after the floor deck is cast, thereby reducing the waste of materials; a one-time casting molding structure for high-precision cast-in-place floor without leveling is used to assist in leveling, realize synchronous grouting, and reduce the grouting time.

Description

Technical Field

[0001] The invention belongs to the field of construction engineering, and in particular relates to a novel construction method for a steel structure floor deck. Background Art

[0002] At present, steel structure buildings are becoming more and more common in construction projects. They are light in weight, high in strength and simple to construct. They are widely used in large factories, stadiums, super high-rise buildings and other fields. The construction of floor decking is an important part of steel structure buildings. The construction of floor decking is first carried out by steel truss floor decking, then by bolt welding and steel bar binding, and finally by supporting the bottom formwork and pouring concrete.

[0003] In the prior art, the connection method between the steel truss and the bottom formwork mainly has the following disadvantages: 1) The traditional connection method between the steel truss and the bottom formwork is mainly welding, which is not energy-saving and environmentally friendly; 2) The current common connection method between the steel truss and the bottom formwork is to weld the trough position of the web steel bars of the steel truss to the connecting steel bars. When installing the bottom formwork, the connecting steel bars are passed through the connection holes reserved on the bottom formwork, and then the bottom formwork is fixed with nuts; after the concrete is poured and cured, the nuts are loosened and the bottom formwork is removed. At this time, the connecting steel bars are exposed to the bottom surface of the concrete floor slab. In order to ensure the flatness of the floor slab, the connecting steel bars need to be cut off. Therefore, the subsequent processing of the steel truss floor slab involved in the structure is relatively cumbersome; 3) In some construction methods, after the floor slab is cast and formed, the bottom slab is regarded as a part of the floor slab and is not removed. Although this facilitates construction, it is bound to increase the thickness of the floor slab, the bottom formwork cannot be recycled, and the construction cost is high.

[0004] At the same time, the flatness of the floor decking is crucial to the service life of the building, and the existing technology for handling the flatness of the floor decking has the following shortcomings: 1) The traditional floor concrete pouring controls the flatness by marking horizontal marks on the protruding column steel bars to control the overall level. The horizontal accuracy may not meet the requirements in some parts, and secondary leveling is required; 2) The spacing between the column steel bars is large, and a long scraper is required to level them, which is labor-intensive and has high construction costs; 3) It is difficult to ensure consistent slump during concrete pouring, and the concrete shrinks unevenly. There is no horizontal mark as a reference when finishing, so it is difficult to achieve the effect of no leveling. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a new construction method for a steel structure floor deck.

[0006] The new type of steel structure floor deck construction device used in the new type of steel structure floor deck construction method includes: a bottom mold, a bottom mold recovery type steel truss floor deck clamp structure and a one-time casting molding structure for high-precision cast-in-place ground without leveling;

[0007] The bottom formwork recovery type steel bar truss floor deck clamp structure is scissor-shaped, including an external clamp, an internal clamp, bolts, connectors and connecting steel bar connection holes; the bottom of the external clamp is handle-shaped, and the top is fixedly connected to the internal clamp by the connector, and the two sets of connected external clamps and internal clamps are connected to each other with bolts as the rotation axis, and the bolts are arranged on the two external clamps; the two internal clamps are provided with connecting steel bar connection holes, and the connecting steel bar connection holes extend from the center of the internal clamp to one side of the internal clamp, and the extension directions of the connecting steel bar connection holes on the two internal clamps are opposite;

[0008] The one-time casting structure of the non-leveling high-precision cast-in-place floor includes a middle square non-leveling structure and a guide rail. The middle square non-leveling structure moves along the guide rail. Square standard sections are arranged on both sides of the middle square non-leveling structure. The middle square non-leveling structure and the bottom rear of the square standard section are connected with horizontal baffles through hinges. The installation position of the horizontal baffles is lower than the lower surface of the guide rail.

[0009] The bottom formwork is arranged below the pouring position of the floor decking, and the internal clamp of the bottom formwork recovery steel bar truss floor decking clamp structure extends from below into the top of the bottom formwork and is fixedly connected with the connecting steel bars of the floor decking; the one-time casting forming structure of the high-precision cast-in-place floor that does not require leveling is arranged above the pouring position of the floor decking.

[0010] As a preferred embodiment: when the bottom formwork recovery type steel bar truss floor deck clamp structure is closed, the connecting steel bar connection holes on the two internal clamps partially overlap to form a circular through hole, and the diameter of the circular through hole matches the diameter of the connecting steel bar of the floor deck steel bar truss.

[0011] Preferably: both external clamps are provided with fixing components, and when the bottom formwork recovery type steel bar truss floor deck clamp structure is closed, the fixing components on the two external clamps are fixedly connected to each other; the internal clamp is provided with a fixing guide groove at one end away from the external clamp, and there is also an internal clamp fixing component matching the fixing guide groove; when the bottom formwork recovery type steel bar truss floor deck clamp structure is closed, the fixing guide grooves at the top ends of the two internal clamps are fixedly connected by the internal clamp fixing components.

[0012] As a preferred embodiment: a connection hole sealing member is provided between the gap between the bottom formwork recovery type steel bar truss floor decking clamp structure and the bottom formwork.

[0013] As a preferred embodiment: a groove in the front-to-back direction is provided at the bottom of the left and right sides of the middle square leveling-free structure, and the length direction of the groove and the guide rail are the same; a number of leveling bolts are provided in each groove, and the middle square leveling-free structure is supported on the guide rail by the leveling bolts, and a horizontal bubble is provided on the top of the middle square leveling-free structure, and the depth of the groove is greater than the sum of the heights of the leveling bolts and the guide rail.

[0014] As a preferred embodiment: the middle square leveling-free structure and the square standard section are both provided with grouting holes, slurry outlets and annular hooks; an angle sensor is provided on the horizontal baffle; the middle square leveling-free structure and the square standard section are both provided with a hollow structure for storing concrete slurry, the top of the hollow structure is connected to the grouting hole, a propeller is provided on the inner side of the bottom of the hollow structure, and the bottom of the hollow structure is connected to the slurry outlet.

[0015] The novel construction method of the steel structure floor deck comprises the following steps:

[0016] Step 1: Make the steel trusses of the floor deck, fully lay the steel trusses on the steel beams and weld them with bolts, tie the floor deck steel bars and set the connecting steel bars, make the bottom formwork, and drill holes in the bottom formwork;

[0017] Step 2: Assemble the bottom form recycling type steel bar truss floor deck clamp structure, extend the internal clamp part from bottom to top into the opening on the bottom form, use the handle of the external clamp to open one end of the two internal clamps, clamp the connecting steel bars through the connecting steel bar connection holes on the two internal clamps, and then use the handle of the external clamp to close the two internal clamps and fix them; install the connection hole blocking component at the gap between the assembled bottom form recycling type steel bar truss floor deck clamp structure and the opening on the bottom form;

[0018] Step 3: Set a guide rail above the steel truss of the floor deck, install the high-precision cast-in-place floor one-time casting structure without leveling on the guide rail, set the horizontal baffle under the guide rail, and adjust the middle square leveling-free structure to a horizontal level by leveling bolts;

[0019] Step 4: pour the floor deck through the middle square leveling-free structure and the square standard section, detect the levelness of the concrete surface through the horizontal baffle, and pull the middle square leveling-free structure and the square standard section through the circular hook to complete the pouring of the floor deck concrete;

[0020] Step 5: After the floor slab concrete solidifies, remove the connector, separate the external fixture from the internal fixture, and then recycle the external fixture and the connection hole plugging component.

[0021] Preferably, in step 2, after closing the two internal clamps using the handles of the external clamps, the fixing components on the two external clamps are fixedly connected to each other, and the internal clamp fixing components are installed on the fixing guide grooves of the two internal clamps from above the steel truss to fix the ends of the internal clamps.

[0022] The beneficial effects of the present invention are:

[0023] 1) The present invention proposes a bottom formwork recycling type steel bar truss floor deck clamp structure, in which the bottom formwork and the steel bars are stably connected to the bottom formwork through a detachable clamp, and the truss steel bars of the recyclable steel bar truss floor deck are processed in the factory, which retains the advantages of good control of the steel bar spacing and the thickness of the steel bar protective layer of the traditional steel bar truss floor deck. The on-site construction operation is simple and easy, and the bottom formwork and the truss steel bars only need to be connected together through a connecting structure; the bottom formwork can be recycled after the floor deck is cast, thereby reducing material waste.

[0024] 2) This bottom formwork recovery type steel truss floor deck clamp structure has a concrete blocking component at the bottom formwork connection hole to reduce the overflow of concrete during the pouring process and reduce the environmental pollution of construction waste.

[0025] 2) When pouring concrete, a high-precision cast-in-place floor one-time casting structure that does not require leveling is used to assist in leveling. The structure is assembled from a square middle leveling-free structure and square standard sections. The leveling-free structure is equipped with a concrete storage room and a propeller. The concrete is not prone to premature solidification during the construction process. It is directly connected to each component with a grouting pipe to achieve synchronous grouting and reduce grouting time.

[0026] 3) When the angle between the horizontal baffle and each standard section and the middle square leveling-free component reaches 90°, it proves that the floor concrete is level, and the floor concrete is cast in one time to achieve the effect of no leveling, which reduces certain construction steps under the condition of achieving leveling-free floor concrete casting.

[0027] 4) This high-precision cast-in-place floor structure that does not require leveling and can be cast in one go can be assembled by appropriately increasing or decreasing standard sections according to the specific length of the floor, which greatly improves the turnover rate of the leveling-free structure and produces better economic and social benefits when applied in actual construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of the bottom formwork recovery type steel bar truss floor deck clamp structure after installation;

[0029] Figure 2 This is a schematic diagram of the structure of the bottom formwork recovery type steel bar truss floor deck fixture structure after being split into left and right parts;

[0030] Figure 3 A schematic diagram of a bolt gun;

[0031] Figure 4 Schematic diagram of the structure of high-precision cast-in-place floor that is cast in one go to avoid leveling;

[0032] Figure 5 It is a schematic diagram of the coordination of the leveling bolts, the horizontal baffle and the guide rail;

[0033] Figure 6This is a schematic diagram of the middle square leveling-free structure installed on the guide rail.

[0034] Explanation of the reference numerals: bottom mold 1, external clamp 2, internal clamp 3, bolt 4, connector 5, connection hole blocking member 6, fixing member 7, connecting steel bar connection hole 8, fixing guide groove 9, internal clamp fixing member 10, middle square leveling-free structure 2-1, square standard section 2-2, connector 2-3, horizontal baffle 2-8, hinge 2-9, bolt 2-10, annular hook 2-11, angle sensor 2-12, propeller 2-13, horizontal bubble 2-14, leveling bolt 2-15, grouting hole 2-16, slurry outlet 2-17, guide rail 2-18. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0036] Embodiment 1

[0037] As an example, Figures 1 to 6 As shown, a new type of steel structure floor deck construction device used in a new type of steel structure floor deck construction method includes: a bottom mold 1, a bottom mold recovery type steel truss floor deck clamp structure and a one-time casting molding structure for high-precision cast-in-place ground without leveling; an opening is provided on the bottom mold 1 for the bottom mold recovery type steel truss floor deck clamp structure to extend above it and be fixed to the connecting steel bars of the floor deck steel truss.

[0038] like Figure 1 and Figure 2 As shown, the bottom formwork recovery type steel bar truss floor deck clamp structure is scissor-shaped, including an external clamp 2, an internal clamp 3, a bolt 4, a connector 5 and a connecting steel bar connection hole 8; the bottom of the external clamp 2 is handle-shaped, and the top is fixedly connected to the internal clamp 3 by the connector 5, and the two sets of connected external clamps 2 and internal clamps 3 are connected to each other with the bolt 4 as the rotation axis, and the bolt 4 is arranged on the two external clamps 2; the two internal clamps 3 are provided with a connecting steel bar connection hole 8, and the connecting steel bar connection hole 8 extends from the center of the internal clamp 3 to one side of the internal clamp 3, and the extension directions of the connecting steel bar connection holes 8 on the two internal clamps 3 are opposite; when the bottom formwork recovery type steel bar truss floor deck clamp structure is closed, the connecting steel bar connection holes 8 on the two internal clamps 3 partially overlap to form a circular through hole, and the diameter of the circular through hole matches the diameter of the connecting steel bar of the floor deck steel bar truss.

[0039] Both external clamps 2 are provided with fixing components 7. When the bottom mold recovery type steel bar truss floor deck clamp structure is closed, the fixing components 7 on the two external clamps 2 are fixedly connected to each other; the internal clamp 3 is provided with a fixing guide groove 9 at one end away from the external clamp 2, and there is also an internal clamp fixing component 10 matching the fixing guide groove 9; when the bottom mold recovery type steel bar truss floor deck clamp structure is closed, the fixing guide grooves 9 at the top ends of the two internal clamps 3 are fixedly connected by the internal clamp fixing components 10, and the internal clamp fixing components 10 are steel wire ropes fixed to the periphery of the fixing guide grooves 9 to fix the two internal clamps 3 to prevent the steel bar truss from moving when the floor deck is poured.

[0040] like Figures 4 to 6 As shown, the one-time casting structure of the leveling-free high-precision cast-in-place floor includes a middle square leveling-free structure 2-1 and a guide rail 2-18. The middle square leveling-free structure 2-1 moves along the guide rail 2-18. The bottoms of the left and right sides of the middle square leveling-free structure 2-1 are each provided with a groove in the front-to-back direction, and the length direction of the groove and the guide rail 2-18 are the same; two leveling bolts 2-15 are provided in each groove, and the middle square leveling-free structure 2-1 is supported on the guide rail 2-18 by the leveling bolts 2-15. A leveling bubble 2-14 is provided on the top of the middle square leveling-free structure 2-1, and the leveling bolt 2-15 can be adjusted according to the state of the leveling bubble 2-14 to keep the middle square leveling-free structure 2-1 horizontal and reduce the error of the floor level; the depth of the groove is greater than the sum of the heights of the leveling bolts 2-15 and the guide rail 2-18, and the width is also slightly greater than the guide rail 2-18, so that the middle square leveling-free structure 2-1 can move on the guide rail 2-18.

[0041] The middle square leveling-free structure 2-1 is fixedly connected to the square standard sections 2-2 on both sides by the connecting pieces 2-3, and the number of the square standard sections 2-2 can be increased or decreased according to the width of the cast floor, and all are fixed by the connecting pieces 2-3. The connecting pieces 2-3 are passed through the preset holes of the middle square leveling-free structure 2-1 and fixed on the middle square leveling-free structure 2-1, and then the preset holes of the square standard sections 2-2 are aligned and inserted into the connecting pieces on the middle square leveling-free structure 2-1, so that the middle square leveling-free structure 2-1 and the square standard sections 2-2 are connected to each other to form a complete structure.

[0042] The middle square leveling-free structure 2-1 and the square standard section 2-2 are both connected to a horizontal baffle 2-8 at the bottom rear through hinges 2-9 and bolts 2-10. The hinges 2-9 can be rotated to make the horizontal baffle 2-8 rise and fall according to the surface of the concrete slurry poured below. The horizontal baffle 2-8 is transparent, which is convenient for operators to check whether the concrete is filled. An angle sensor 2-12 is provided on the horizontal baffle 2-8. When the angle sensor 2-12 shows that the angle between the horizontal baffle 2-8 and the middle square leveling-free structure 2-1 and the square standard section 2-2 is 90°, it means that the concrete slurry below the horizontal baffle 2-8 is level.

[0043] The installation position of the horizontal baffle 2-8 is lower than the lower surface of the guide rail 2-18, so that the guide rail 2-18 will not interfere with the pouring of concrete and can be recycled; the middle square leveling-free structure 2-1 and the square standard section 2-2 are both provided with grouting holes 2-16, slurry outlets 2-17 and annular hooks 2-11; the middle square leveling-free structure 2-1 and the square standard section 2-2 are both provided with hollow structures for storing concrete slurry to prevent debris from contaminating the concrete; the top of the hollow structure is connected to the grouting hole 2-16, and a propeller 2-13 is provided at the inner center point of the bottom of the hollow structure, so that the concrete slurry does not solidify prematurely to avoid material waste; the bottom of the hollow structure is connected to the slurry outlet 2-17.

[0044] The annular hook 2-11 is arranged at the center in front of the middle square leveling-free structure 2-1 and the square standard section 2-2. The operator can pass the rope through the annular hook 2-11 to pull the middle square leveling-free structure 2-1 and the square standard section 2-2 to realize the casting of the entire floor deck.

[0045] The bottom form 1 is arranged below the pouring position of the floor slab, and the internal clamp 3 of the bottom form recycling steel bar truss floor slab clamp structure extends from below into the top of the bottom form 1 and is fixedly connected with the connecting steel bar of the floor slab; a connection hole plugging member 6 is arranged between the opening gap of the bottom form recycling steel bar truss floor slab clamp structure and the bottom form 1, and the connection hole plugging member 6 is made of rubber material and is slightly larger than the opening of the bottom form 1 to achieve the plugging and fixation of the concrete. The one-time casting molding structure of the high-precision cast-in-place floor without leveling is arranged above the pouring position of the floor slab.

[0046] Embodiment 2

[0047] As another embodiment, a method for performing a new type of construction of a steel structure floor deck using the new type of construction device for the steel structure floor deck described in the first embodiment includes the following steps:

[0048] Step 1: Make the steel truss of the floor slab. The steel truss formwork is a composite formwork that processes the steel bars in the floor slab into steel trusses in the factory and connects the steel trusses with the bottom form 1 into one. The steel bars form a truss to bear the load during construction; during the construction process, the steel truss floor slab is fully laid on the steel beam and is used as Figure 3 The studs shown are welded firmly and can be used as scaffolding for installers. During construction, the construction load on the steel truss floor deck shall not exceed the load of the floor deck design construction stage. Before the lower steel beam of the corresponding floor deck is fully installed, the corresponding steel truss floor deck construction shall not be carried out. The steel truss is fully laid on the steel beam and welded with studs, the floor deck steel bars are tied and the connecting steel bars are set, the bottom formwork 1 is made, and holes are opened in the bottom formwork 1; the bottom formwork 1 is used to support the wet concrete, so this technology can avoid the work and cost of supporting the formwork.

[0049] Step 2, assemble the bottom form recycling type steel bar truss floor deck clamp structure, bolt 4 cooperates with nut to connect and fix the left and right two external clamps 2 together; extend the internal clamp 3 part from bottom to top into the opening on the bottom form 1, use the handle of the external clamp 2 to open one end of the two internal clamps 3, clamp the connecting steel bar through the connecting steel bar connecting hole 8 on the two internal clamps 3, and use the handle of the external clamp 2 to close the two internal clamps 3, fix the fixing members 7 on the two external clamps 2 to each other, and install the internal clamp fixing member 10 on the fixing guide groove 9 of the two internal clamps 3 from above the steel bar truss to fix the ends of the internal clamps 3; so that the reinforced concrete becomes a whole during pouring; install the connection hole blocking member 6 at the gap between the assembled bottom form recycling type steel bar truss floor deck clamp structure and the opening on the bottom form 1;

[0050] Step 3. According to the required height of the floor decking surface, a guide rail 2-18 is set above the steel truss of the floor decking surface, and a high-precision cast-in-place floor one-time casting molding structure without leveling is installed on the guide rail 2-18. The horizontal baffle 2-8 is set below the guide rail 2-18, and the middle square leveling-free structure 2-1 is adjusted to a horizontal level by the leveling bolt 2-15; at the same time, check whether the distance between the leveling baffle and the bottom mold 1 is the required height of the floor decking surface. If there is a deviation, it can be fine-tuned by the leveling bolt 15.

[0051] Step 4: pour the floor deck through the middle square leveling-free structure 2-1 and the square standard section 2-2, detect the levelness of the concrete surface through the horizontal baffle 2-8, and when the concrete fills the rear edge of the horizontal baffle, pull the middle square leveling-free structure 2-1 and the square standard section 2-2 through the annular hook 2-11 to complete the pouring of the floor deck concrete;

[0052] Step 5: After the floor slab concrete solidifies, remove the connector 5, separate the external fixture 2 from the internal fixture 3, and then recycle the external fixture 2 and the connection hole plugging member 6.

[0053] Embodiment 3

[0054] As another embodiment, in step 1 of embodiment 2:

[0055] Specifically: before entering the site, its variety, specification and performance shall meet the design requirements and the provisions of the current national standards. The supplier shall provide a quality certificate and a factory certificate when supplying goods. The on-site acceptance and construction shall be carried out strictly in accordance with the design and the "Code for Acceptance of Steel Structure Construction Quality" GB50205-2001. The variety, specification and size of the bottom formwork 1 entering the site shall be checked, and the product quality certification documents and inspection reports shall be carefully checked.

[0056] The bottom formwork 1 should be packed and brought to the site in layers. Each bundle of bottom formwork 1 should be placed in a nearby yard under the floor where the bundle is to be installed, and protective measures should be taken in time to prevent damage, deformation and oil pollution. At the same time, all supporting components such as the baffles, edge panels, etc. of the bottom formwork 1 of this layer should be brought to the site in advance.

[0057] The bottom form 1 is transported to the site, unloaded and stacked neatly. The steel truss plate should be stacked in a safe area on the ground that is pollution-free, does not hinder traffic, and is not hit by heavy objects. The steel truss plate should be stacked with sleepers to prevent water from soaking the ground, and the sleepers should have a certain inclination to prevent water from accumulating on the top. The stacking should not be too high. After the plates are prepared on the ground, they are hoisted into each construction section respectively. When hoisting, pay close attention to the layout diagram of the steel truss template and the packaging mark to avoid the staggered hoisting and placement positions.

[0058] The steel truss plate has been accurately processed according to the detailed drawing when it is processed in the manufacturing plant. During on-site construction, it is only necessary to lay out the positioning reference line of the bottom formwork 1 during the installation process.

[0059] Lay the bottom formwork 1, tie the bottom reinforcement and some additional reinforcement according to the template plan layout. Where the plane shape changes, the bottom formwork 1 should be cut, and the end support reinforcement should be welded before installation.

[0060] When the steel truss formwork crosses the beam and the foot of the steel truss web is not supported on the beam, the support steel bars should be welded at the beam. The length of the steel truss formwork extending into the beam edge must meet the design requirements.

[0061] After the steel truss formwork is laid, the finished product should be well protected to avoid surface depression; during the construction process, it should be carried out strictly in sequence and quality inspections should be carried out step by step. After the installation is completed, hidden and handover acceptance should be carried out.

[0062] Rebar truss formwork should be cut by plasma or mechanical cutting instead of flame cutting to prevent damage to the galvanized base plate.

[0063] Before laying the bottom form 1, the top surface of the steel beam must be carefully cleared of debris, oil, rain, frost, snow, etc. Pay attention to safety during operation, hang the safety belt on the safety rope, and remove the safety rope after the corresponding safety facilities are removed.

[0064] The steel truss formwork is laid from one end to the other, and the corners are processed last. Connection holes are opened on the bottom form 1, and it is laid in the order of the main structure installation and construction. The bottom form 1 should be installed after the steel column and the supporting steel beam are installed. Align the reference line, install the first plate, and then install other plates in sequence. The connection between the plates is buckled, and the hook connection should be tight. When laying the bottom form 1, ensure that the plane is straight and no concave is allowed. The sealing plate, side form, and side form reinforcement finishing are based on the construction progress requirements.

[0065] When overlapping, the length of the steel truss floor deck extending into the beam edge must meet the design requirements. The overlapping length in the length direction of the floor deck, that is, the distance between the upper flange edge of the steel beam and the end vertical support steel bar should not be less than the larger value of 5d and 50mm, where d is the diameter of the lower chord steel bar of the steel truss.

[0066] The overlap length between the bottom formwork and the steel beam in the width direction of the formwork should not be less than 30mm to ensure that there is no leakage when pouring concrete. The bottom formwork of the steel truss floor slab adopts the buckle method on the side, and the side of the slab should be equipped with a connecting hook, and the overlap width should not be less than 10mm.

[0067] When there is no supporting angle steel at the end of the column, L50X5 angle steel is welded on the periphery of the column. When there is supporting angle steel, there is no need to weld the peripheral angle steel. The main structure adopts steel truss floor deck. For the floor area that does not meet the maximum unsupported span of the steel truss floor deck during the construction stage, a reliable temporary support must be set in the middle of the floor deck span in the direction perpendicular to the steel truss.

[0068] Studs are set on the upper part of the steel beam and welded through the floor plate. The stud construction process mainly includes marking and positioning, cleaning the welding area, trial welding and welding.

[0069] Marking positioning, tools: steel ruler, marking needle, sample punch, hammer. Operation: Use steel ruler and marking needle to mark the position of welding nails on the component according to the position and spacing required by the design and punch holes at the position of welding nails. Requirements: Meet the requirements of engineering design, and the position tolerance is ±1mm.

[0070] Clean the welding area: Use an angle grinder to clean the coating of the welded part of the component, and use a wire brush to clean the iron filings and residues. Requirements: There must be no paint, other coatings, water, grease, or other stains that affect the quality of the weld on the surface of the welded steel component.

[0071] Test welding: Before formal welding of each specification of welding nails in each project, a test welding must be carried out. The welding nail is bent 30° by hitting it with a hammer or using a sleeve to perform a bending test to check whether it meets the quality requirements. If it does not meet the requirements, the construction process should be modified, the process parameters should be adjusted and tested again until the requirements are met. When using a sleeve for testing, the distance between the lower end of the sleeve and the upper end of the weld should not be less than 1d.

[0072] Welding: Place the welding nail in the clamping device of the welding gun, place the protective ceramic ring of corresponding diameter on the base material, insert the welding nail into the ceramic ring and make it contact with the base material; press the power switch, the welding nail will automatically rise and ignite the arc; the welding current will increase to melt the end of the welding nail and the local surface of the base material; after the set arc burning time is reached, the welding nail will be automatically pressed into the base material; cut off the power supply, the molten metal will solidify, and keep the welding gun still; let the weld cool, and a uniform annular weld excess height will be formed on the surface of the end of the welding nail, then break and remove the ceramic ring, and the welding is completed.

[0073] According to the specific situation, determine the key points and difficulties of control, and formulate corresponding measures. Special attention should be paid to the requirements of earthquake-resistant structures such as steel bar lap and anchorage length, joint position, and straight length of bend hooks.

[0074] The steel bar processing ingredient list is compiled according to each layer such as project location and flow section. The steel bar grade, diameter, cutting length, bending forming size, number of roots, etc. are listed separately. Each type of steel bar should be numbered, and the processing, supply and on-site construction must correspond to the number.

[0075] Since the iron reinforcement under the floor slab arranged perpendicular to the direction of the steel truss formwork is set above the lower chord reinforcement of the steel truss formwork, the thickness of the protective layer has been considered in the design of the steel truss formwork, so there is no need to set up protective layer pads; the iron distribution reinforcement on the floor slab is set on the lower surface of the chord reinforcement in the direction perpendicular to the steel truss formwork, and the thickness of the reinforcement protective layer can be controlled by the method of diagonal pulling lines during the concrete pouring process.

[0076] The construction sequence of additional reinforcement is: set the lower additional reinforcement → set the additional reinforcement at the edge of the hole → set the upper additional reinforcement → set the connecting reinforcement → set the negative bending moment reinforcement of the support.

[0077] The openings on the steel truss floor decking should be approved by the design and the positioning should be done on site; the edge reinforcement of the opening must be set according to the design requirements. When there is a large concentrated load on the edge of the hole or the length of the hole is greater than 1000mm, the edge beam of the hole should be set. When the length of the hole is less than 1000mm, the edge reinforcement of the opening should be set according to the design requirements and set under the steel truss surface reinforcement. The steel bars and steel plates of the steel truss floor decking can only be cut when the floor concrete reaches 75% of the design strength. When cutting, it is advisable to cut from bottom to top to prevent the edge of the bottom mold from separating from the poured concrete. When cutting, it is advisable to use plasma cutting of the galvanized steel plate of the bottom mold, and flame cutting is not allowed.

[0078] In step 4:

[0079] Concrete pouring process: cleaning construction joints → concrete pumping and pouring → concrete leveling → concrete curing.

[0080] Before pouring concrete, a construction inspection shall be carried out, and the installation of the steel truss floor deck and other works shall be completed and accepted; the debris on the floor deck must be removed, including the porcelain rings on the bolts, dust, grease, etc. Including:

[0081] Whether the dimensions of the steel truss floor decking meet the requirements; whether the models of the steel truss floor decking in each construction area are consistent with the drawings; whether the lap length of the steel truss floor decking on the beam along the length and width of the board at the laying starting point and the disconnection point meets the requirements; whether the vertical reinforcement of the board end support, the galvanized bottom template edge and the side template are firmly welded to the steel beam; the board edge and special-shaped or cut positions should ensure that there is no leakage; whether the column side support angle steel setting meets the design requirements; whether the reserved hole position is within the allowable deviation range; whether the temporary support is set in place according to the design requirements; check whether the side pull-joint hooks of the steel truss floor decking are tightly connected. During the construction process, strictly follow the sequence and conduct quality inspections step by step. After the installation is completed, conduct concealed and handover acceptance.

[0082] When the design requires temporary support during the construction phase, temporary support should be set up at the corresponding position according to the design requirements. When temporary support is set up, the support can be removed only when the concrete strength reaches 75% of the design strength for floors less than 5 meters, and the support can be removed only when the concrete strength reaches the design strength for floors greater than 5 meters. Temporary support shall not use isolated point support, and strip horizontal support such as wood and steel plates shall be set up. The width of the contact surface between the strip horizontal support and the floor slab shall not be less than 100㎜.

[0083] When setting up temporary supports, for floor slabs with a span of less than 8 meters, the temporary supports shall not be removed before the concrete strength of the floor slab reaches 75% of the design strength; for floor slabs with a span of more than 8 meters, the supports may be removed only after the concrete strength reaches 100% of the design strength; for cantilevered parts, temporary supports shall not be removed until the concrete reaches 100% of the design strength.

[0084] When pouring concrete, the steel truss floor deck shall not be impacted. When pouring concrete, it is advisable to pour it in the position facing the steel beam or temporary support. The pouring range or temporary accumulation caused by pouring concrete shall not exceed the steel truss floor deck within 1 / 6 of the span of the steel beam or temporary support on the left and right sides, and it shall be quickly spread out to the surroundings to avoid excessive accumulation; it is strictly forbidden to pour concrete in the span of the steel truss floor deck. The pumping concrete pipe support should be supported on the steel beam.

[0085] No other load shall be added to the floor until the concrete strength reaches 75% of the design strength.

[0086] When it is necessary to leave a construction joint, use an air compressor to clean up the debris in the formwork before pouring concrete. And check whether the concrete protective layer pad is well padded. The floor slab construction joint is left within the middle one-third of the span; Construction joint treatment measures: All construction joints are separated by multi-layer boards. Before pouring concrete in the next flow section, the construction joint is treated. Before treatment, a through line is drawn on the edge of the concrete, and a toothless saw is used to cut to ensure that the construction joint is straight. When cutting, the cutting depth is strictly controlled to prevent touching the steel bars. After the floating slurry layer of the construction joint is removed, the concrete is watered and moistened. The construction joint treatment must be handled after the concrete strength reaches 1.2Mp.

Claims

1. A steel structure floor deck construction device, characterized in that: include: Bottom formwork (1), bottom formwork recovery type steel bar truss floor deck fixture structure and one-time casting molding structure of high-precision cast-in-place floor without leveling; The bottom formwork recovery type steel bar truss floor deck clamp structure is scissor-shaped, comprising an external clamp (2), an internal clamp (3), a bolt (4), a connecting piece (5) and a connecting steel bar connection hole (8); the bottom of the external clamp (2) is in the shape of a handle, and the top is fixedly connected to the internal clamp (3) through the connecting piece (5), and the two sets of connected external clamps (2) and internal clamps (3) are mutually connected with the bolt (4) as the rotation axis, and the bolt (4) is arranged on the two external clamps (2); the two internal clamps (3) are both provided with a connecting steel bar connection hole (8), and the connecting steel bar connection hole (8) extends from the center of the internal clamp (3) to one side of the internal clamp (3), and the extension directions of the connecting steel bar connection holes (8) on the two internal clamps (3) are opposite; The one-time casting structure of the high-precision cast-in-place floor without leveling comprises a middle square-shaped leveling-free structure (2-1) and a guide rail (2-18). The middle square-shaped leveling-free structure (2-1) moves along the guide rail (2-18). Square standard sections (2-2) are arranged on both sides of the middle square-shaped leveling-free structure (2-1). The bottom rear of the middle square-shaped leveling-free structure (2-1) and the square standard section (2-2) are connected with a horizontal baffle (2-8) through a hinge (2-9). The installation position of the horizontal baffle (2-8) is lower than the lower surface of the guide rail (2-18). The bottom form (1) is arranged below the pouring position of the floor deck, and the internal clamp (3) of the bottom form recycling steel bar truss floor deck clamp structure extends from the bottom into the top of the bottom form (1) and is fixedly connected with the connecting steel bars of the floor deck; the one-time casting forming structure of the high-precision cast-in-place floor without leveling is arranged above the pouring position of the floor deck.

2. The steel structure floor deck construction device according to claim 1 is characterized in that: When the bottom formwork recovery type steel bar truss floor deck clamp structure is closed, the connecting steel bar connection holes (8) on the two internal clamps (3) partially overlap to form a circular through hole, the diameter of which matches the diameter of the connecting steel bar of the floor deck steel bar truss.

3. The steel structure floor deck construction device according to claim 1 is characterized in that: Both external clamps (2) are provided with a fixing member (7); when the bottom mold recovery type steel truss floor deck clamp structure is closed, the fixing members (7) on the two external clamps (2) are fixedly connected to each other; an end of the internal clamp (3) away from the external clamp (2) is provided with a fixing guide groove (9), and there is also an internal clamp fixing member (10) matching the fixing guide groove (9); when the bottom mold recovery type steel truss floor deck clamp structure is closed, the fixing guide grooves (9) at the top ends of the two internal clamps (3) are fixedly connected via the internal clamp fixing member (10).

4. The steel structure floor deck construction device according to claim 1, characterized in that: A connection hole blocking component (6) is provided between the gap between the bottom formwork recovery type steel bar truss floor deck clamp structure and the bottom formwork (1).

5. The steel structure floor deck construction device according to claim 1 is characterized in that: A groove in the front-to-back direction is respectively arranged at the bottom of the left and right sides of the middle square leveling-free structure (2-1), and the length direction of the groove is the same as that of the guide rail (2-18); a plurality of leveling bolts (2-15) are arranged in each groove, and the middle square leveling-free structure (2-1) is supported on the guide rail (2-18) by the leveling bolts (2-15); a level bubble (2-14) is arranged at the top of the middle square leveling-free structure (2-1), and the depth of the groove is greater than the sum of the heights of the leveling bolts (2-15) and the guide rail (2-18).

6. The steel structure floor deck construction device according to claim 1, characterized in that: The middle square leveling-free structure (2-1) and the square standard section (2-2) are both provided with grouting holes (2-16), grouting outlets (2-17) and annular hooks (2-11); an angle sensor (2-12) is provided on the horizontal baffle (2-8); a hollow structure for storing concrete slurry is provided inside the middle square leveling-free structure (2-1) and the square standard section (2-2); the top of the hollow structure is connected to the grouting hole (2-16), the inner side of the bottom of the hollow structure is provided with a propeller (2-13), and the bottom of the hollow structure is connected to the grouting outlet (2-17).

7. The construction method of the steel structure floor deck construction device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Make a steel truss for the floor deck, fully lay the steel truss on the steel beam and weld it with bolts, tie the floor deck steel bars and set connecting steel bars, make a bottom mold (1), and drill holes in the bottom mold (1); Step 2: assemble the bottom formwork recovery type steel bar truss floor deck clamp structure, extend the internal clamp (3) part from bottom to top into the opening on the bottom formwork (1), use the handle of the external clamp (2) to open one end of the two internal clamps (3), clamp the connecting steel bars through the connecting steel bar connection holes (8) on the two internal clamps (3), and then use the handle of the external clamp (2) to close the two internal clamps (3) and fix them; install the connection hole blocking component (6) at the gap between the assembled bottom formwork recovery type steel bar truss floor deck clamp structure and the opening on the bottom formwork (1); Step 3: a guide rail (2-18) is arranged above the steel truss of the floor deck, a high-precision cast-in-place floor one-time casting structure without leveling is installed on the guide rail (2-18), a horizontal baffle (2-8) is arranged below the guide rail (2-18), and the middle square leveling-free structure (2-1) is adjusted to a horizontal level by means of a leveling bolt (2-15); Step 4: pouring the floor deck through the middle square leveling-free structure (2-1) and the square standard section (2-2), detecting the levelness of the concrete surface through the horizontal baffle (2-8), and pulling the middle square leveling-free structure (2-1) and the square standard section (2-2) through the annular hook (2-11) to complete the pouring of the floor deck concrete; Step 5: After the floor slab concrete solidifies, remove the connecting piece (5), separate the external clamp (2) from the internal clamp (3), and then recycle the external clamp (2) and the connecting hole plugging component (6).

8. The construction method of the steel structure floor deck construction device according to claim 7, characterized in that: In step 2, after the two internal clamps (3) are closed using the handle of the external clamp (2), the fixing members (7) on the two external clamps (2) are fixedly connected to each other, and the internal clamp fixing member (10) is installed on the fixing guide grooves (9) of the two internal clamps (3) from above the steel bar truss to fix the ends of the internal clamps (3).

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