Beam-column joint concrete wire mesh intercepting device and method

Abstract

The application discloses a beam-column joint concrete wire mesh intercepting device and method, which comprises metal batten and dense mesh. The metal batten is a group and is arranged in parallel and at intervals. The middle part of the metal batten is provided with a clamping groove for fixing the dense mesh. The clamping groove of the metal batten is correspondingly provided with a dense mesh inserting part formed by folding. The dense mesh inserting part is inserted into the clamping groove of the metal batten to realize fixation, so that the metal batten and the dense mesh are connected, and the whole can be wound or folded along the length direction perpendicular to the metal batten, and can be cut and spliced according to the intercepting area. The intercepting device has greater rigidity than the prior art, and the rigidity can be further increased by increasing the number of tensioning screw rods. The device breaks through the limitation that a steel reinforcement framework needs to be customized according to the beam size and reinforcement, and the flexibility in width makes it possible to cope with the interfaces of all beams smaller than the width under one width specification.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of concrete structure engineering, and particularly relates to a beam-column joint concrete wire mesh intercepting device and method. BACKGROUND

[0002] Concrete structure design needs to consider seismic performance, in order to ensure structural ductility, strong node weak component, strong column weak beam needs to be achieved, so that the wall column concrete strength is generally higher than that of beam-column concrete and the stirrup is encrypted in the node range, in some high-rise buildings, the concrete grade between vertical components (walls, columns) and beams is different by several levels. The designer designs a 45-degree inclined interface of different grade concrete at the wall column joint, but it is difficult to achieve the construction of the interface on site.

[0003] Currently, there are three main methods for intercepting the concrete of vertical components in the construction industry: (1) directly using beam reinforcement framework to bind steel wire mesh; (2) welding steel mesh, and binding steel wire mesh on the mesh; (3) using an inflatable air bag. The steel reinforcement form is inserted into the gap from the pouring surface to intercept the two types of concrete. Among them, method (1) and method (3) can only be used for beams with small cross-sectional height. During the pouring process, the concrete is considered as a liquid, and its pressure increases with the increase of height. In addition to the vibration of the vibrator, it is very easy to break the steel wire mesh and bend the inflatable air bag, causing the high-strength concrete of the vertical component to flow into the beam. Method (2) further strengthens the strength of the steel wire mesh by adding a steel mesh framework based on method (1). However, due to the different sizes and specifications of the designed beams, a large amount of time and labor is required to process and weld the concrete intercepting mesh between each vertical component and the beam. Method (2) has the problems of poor rigidity and difficulty in inserting or extracting the air bag when the upper and lower reinforcement of the beam does not correspond.

[0004] Among the above three methods, method (2) has the worst application effect and a small application range, but the construction speed is fast; methods (1) and (3) achieve good construction effect, but also take a long time and labor. When the project is under time pressure or quality management is loose, it is easy to have problems of not using air bags or steel wire mesh.

[0005] In the current construction market, the construction quality of concrete beam-column joints has become a common quality problem in engineering, and the structural safety hazard is huge. In order to ensure that the joint concrete of the column can reach the elevation, some construction enterprises have to cause a large amount of high-strength concrete to flow into the beam when the vertical concrete is intercepted. Because the pumping concrete itself has a large slump, this diffusion not only increases the engineering cost, but also increases the stiffness of the beam itself, which is not in line with the principle of strong column and weak beam in seismic ductility design, and the hidden danger is huge. More often, construction enterprises or labor units do not pour the vertical component concrete to the design elevation, resulting in insufficient strength of the joint. Because of the design safety redundancy, there is no problem in the normal use state, but once the earthquake occurs, there will be a huge quality hidden danger. This situation often occurs in high-rise frame structures.

[0006] In summary, the reasons why the beam-column joint is prone to quality accidents are as follows: 1. The steel wire mesh and air bag have low stiffness and poor interception effect; 2. The steel wire mesh and steel wire mesh reinforcement mesh scheme consumes more labor and time; 3. In the case of poor interception, the cost increases due to the continuous pouring of high-grade concrete into the beam; 4. When the construction period is tight, the lack of labor leads to insufficient investment in beam-column joints. SUMMARY

[0007] The technical problem solved by the present application is to provide a beam-column joint concrete steel wire mesh interception device with large self-stiffness, low cost, quick and simple installation, and strong universality.

[0008] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0009] A beam-column joint concrete steel wire mesh interception device, comprising metal lath and dense mesh.

[0010] The metal lath is a group and is arranged in parallel and at intervals; the middle part of the metal lath is provided with a clamping groove for fixing the dense mesh.

[0011] The dense mesh forms a dense mesh plug-in part by folding at the clamping groove of each metal lath; the dense mesh plug-in part is inserted into the clamping groove of the metal lath to realize fixation, so as to connect the metal lath and the dense mesh, and the whole can be rolled or folded along the vertical direction of the length of the metal lath, and can be cut and spliced according to the interception area.

[0012] It should be noted that the dense mesh can be a whole metal mesh or multiple metal meshes. When the area of a single steel wire mesh is insufficient, the edge parts of two metal meshes can be inserted into the clamping groove of the metal lath to realize splicing.

[0013] Further, the metal strip is folded by a metal plate, and a clamping groove is formed in the middle part; the opening end of the clamping groove is used for inserting the mesh net inserting part, and the closed end of the clamping groove is an arc-shaped bending part with prestress; the metal plates on both sides of the opening end of the clamping groove are bent downward to form a chamfered part.

[0014] It should be noted that the mesh net inserting part can be inserted only on the upper part of the clamping groove, or can be inserted and filled into the inner cavity of the arc-shaped bending part, so as to further improve the connection strength between the mesh net and the metal strip.

[0015] Further, the metal plates on both sides of the opening end of the clamping groove are located in the front section of the chamfered part, and a flange section which is flush with the mesh net is left, the mesh net is supported on the upper surface of the flange section, so that the main strip of the metal strip is more easily guaranteed to be perpendicular to the pouring surface when facing the concrete pressure, and the flange section can also increase the bending stiffness.

[0016] Further, a reinforcing metal rod is longitudinally inserted into the arc-shaped bending part of each metal strip to increase the stiffness of the metal strip.

[0017] Further, a through hole corresponding to each metal strip is provided for the passing of the tensioning screw rod; when the mesh net is unfolded at the intercepting surface, the tensioning screw rod penetrating through each metal strip is used for fixing.

[0018] Further, a connecting piece for connecting the disconnected metal strips is further included.

[0019] Further, a cement-based steel reinforcement pad for intercepting the gap at the bottom or top of the mesh net is further included, and the cement-based steel reinforcement pad includes a cement pad and fibers distributed on both sides of the cement pad to form an intercepting net surface.

[0020] Further, the present application also provides a construction method for intercepting concrete by using the above device, which comprises the following steps:

[0021] (1) according to the size of the beam-column joint intercepting surface, the intercepting net composed of the mesh net and the metal strip is cut to a suitable area, wound to a suitable size, and then put into the steel reinforcement cage, and then unfolded at the intercepting surface, so that the metal strips on both sides are slightly protruding from both sides of the steel reinforcement cage;

[0022] (2) during the unfolding of the intercepting net, if the beam waist reinforcement or hoop reinforcement is encountered, the metal strips on both sides of the corresponding side part need to be cut off, and the mesh net at the position is also cut open; after the intercepting net is unfolded on both sides and passes through the beam waist reinforcement or hoop reinforcement, the cut metal strips are reconnected by the connecting piece, and the cut open part of the mesh net can be stitched by steel wire according to needs;

[0023] (3) Put the tie rod on the plastic sleeve, then pass it through the through hole on the metal rib in sequence, and attach the protective layer pad to both ends of the plastic sleeve (31) to clamp the metal ribs on both sides to the side of the steel cage to prevent the metal ribs from shifting and forming a cold joint in the protective layer.

[0024] (4) The casting mold for the beam is installed. Through holes are opened at the corresponding positions of the tie rods on both sides of the side mold. The two ends of the tie rod pass through the through holes of the side mold, and the tie rod sleeves are installed on the outer ends of the tie rods. The tie rods are reinforced by rotating the tie rod sleeves at both ends.

[0025] (5) Pour concrete into the steel cage.

[0026] Specifically, in step (1), the interception net, composed of dense mesh and metal ribs, is deployed vertically or at an angle within the steel cage, avoiding the stirrups, especially multi-limb stirrups, during deployment. When there are no multi-limb stirrups, the interception net is preferably deployed at a 45-degree angle. When there are multi-limb stirrups, the interception net can be deployed vertically to avoid the stirrups passing through it.

[0027] Specifically, the connector is sleeved at the break point of the metal rib, and the connector is fixed to both ends of the metal rib by welding, riveting or plugging.

[0028] Furthermore, after the concrete has been poured, formed, and the formwork has been removed, the tie rods can be extracted and reused.

[0029] Furthermore, before starting step (1), the type of beam is determined. If there are multiple rows of steel bars at the bottom of the steel cage, cement-based steel bar spacers are placed between the multiple rows of steel bars when the bottom steel bars of the beam are tied. These spacers are used to fill the gaps between the multiple rows of steel bars at the bottom of the beam that are not intercepted. This is used to control the vertical spacing of the bottom steel bars and to solve the problem of concrete interception.

[0030] Furthermore, the present invention also claims protection for the application of the above-mentioned device in intercepting concrete during concrete pouring construction, not limited to concrete pouring beams.

[0031] Beneficial effects:

[0032] (1) Compared with airbags and ordinary steel wire templates without a frame, the interception device of the present invention has greater rigidity than the prior art, and the rigidity can be further increased by increasing the number of tie rods.

[0033] (2) Compared with the steel wire mesh template with added steel reinforcement skeleton, the interception device of the present invention breaks through the limitation that the steel reinforcement skeleton needs to be customized according to the beam size and reinforcement. Its flexibility in width allows it to cope with the interface of all beams smaller than this width within a one-width specification.

[0034] (3) Compared with the steel bar framework steel wire mesh template, the intercepting device of the present application realizes the interception of the concrete in the two-side protection layer area, and this part can also be strengthened by further bending the wire mesh at the edge opening.

[0035] (4) The present application only needs workers to cut and cut the outside mesh net and metal ridge, use the reinforcing member (connecting member) to connect the metal ridge, and wear the tensioning screw rod. The connection of the mesh net and the framework metal ridge is carried out during production, without welding and binding of the steel mesh sheet, the operation is simpler, even in the case of tight construction period, a large amount of labor is not needed.

[0036] (5) The tensioning screw rod in the present application can be turned over and reused. BRIEF DESCRIPTION OF DRAWINGS

[0037] The above and / or other aspects of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the accompanying drawings.

[0038] Figure 1 is a three-dimensional schematic view of the intercepting net composed of the metal ridge strip and the mesh net of the present application.

[0039] Figure 2 is a folded state diagram of the intercepting net composed of the metal ridge strip and the mesh net of the present application.

[0040] Figure 3 is a cross-sectional view of the intercepting net composed of the metal ridge strip and the mesh net of the present application.

[0041] Figure 4 is a connection principle diagram of the metal ridge strip and the mesh net of the present application.

[0042] Figure 5 is a schematic view of the structure on the metal ridge strip with a flange section of the present application.

[0043] Figure 6 is a state diagram of the intercepting net encountering the beam waist during the expansion process.

[0044] Figure 7 is a state diagram of the intercepting net after cutting through the beam waist.

[0045] Figure 8 is a state diagram of the intercepting net after cutting through the connecting member.

[0046] Figure 9 is a state diagram of the metal ridge strip of the present application with a reinforcing metal rod inserted therein.

[0047] Figure 10 is a state diagram of the intercepting net expanded in the steel reinforcement cage and passing through the tensioning screw rod.

[0048] Figure 11is a structural schematic diagram of a cement-based steel reinforcement cushion.

[0049] Figure 12 is a schematic diagram of installation of a cement-based steel reinforcement cushion.

[0050] Figure 13 is a state diagram of filling of a bottom gap of a barrier net by a cement-based steel reinforcement cushion.

[0051] Figure 14 is a concrete pouring effect diagram using the barrier device of the present application.

[0052] Wherein, each reference sign represents:

[0053] 10-metal lath; 101-slot; 102-arc-shaped bent part; 103-chamfered part; 104-through hole; 105-flange section; 106-strengthening metal rod; 20-mesh net; 201-mesh net insertion part; 30-pull screw; 301-plastic sleeve; 302-protection layer cushion; 40-connector; 50-cement-based steel reinforcement cushion; 501-cement cushion; 502-fiber; 60-beam waist. DETAILED DESCRIPTION

[0054] The present application can be better understood according to the following examples.

[0055] As shown in Figure 1 , the barrier device of the present application comprises metal laths 10 and a mesh net 20, which together constitute a barrier net.

[0056] Wherein, the metal laths 10 are arranged in parallel in groups, and the spacing can be set according to the size of the interception pressure; the metal laths 10 are provided with slots 101 in the middle for fixing the mesh net 20.

[0057] As shown in Figure 3 , the mesh net 20 is a whole continuous mesh net; the mesh net 20 is folded to form mesh net insertion parts 201 at positions corresponding to the slots 101 of each metal lath 10; the mesh net insertion parts 201 are inserted into the slots 101 of the metal laths 10 to be fixed, thereby connecting the metal laths 10 and the mesh net 20, and the whole can be folded along the length direction perpendicular to the metal laths 10 (as shown in Figure 2 ), and can be cut according to the interception area. Of course, when the area of a single metal net is insufficient, the edges of two metal nets can be inserted into the slots 101 of the metal laths 10 to realize splicing.

[0058] The metal bars 10 are designed at equal intervals, and the outermost metal bars are kept a distance from the outer edge of the dense mesh 20, which is slightly greater than the thickness of the steel reinforcement protective layer of the beam, to prevent the concrete outside the steel reinforcement framework from flowing. For example, for a 500mm x 1100mm beam, the width of the beam is 500mm, and the cutting width of the intercepting net is about 600mm, because the dense mesh 200 is a flexible material that can be bent, so that the entire intercepting net can be installed in the 500mm wide beam.

[0059] As shown in Figure 4 , the metal bars 10 are folded in half from a metal plate, and a clamping groove 101 is formed in the middle; the opening end of the clamping groove 101 is used for inserting the dense mesh insertion part 201, and the closed end of the clamping groove 101 is an arc-shaped bending part 102 with prestress; the metal plates on both sides of the opening end of the clamping groove are bent downward to form a chamfered part 103. The dense mesh insertion part can be inserted only in the upper part of the clamping groove, or can be inserted and filled into the inner cavity of the arc-shaped bending part, so as to further improve the connection strength between the dense mesh and the metal bars.

[0060] As shown in Figure 5 , the metal plates on both sides of the opening end of the clamping groove are located in the front section of the chamfered part, leaving a flange section 105 that is flush with the dense mesh, and the dense mesh 20 is supported on the upper surface of the flange section 105, so that it is easier to ensure that the main bars of the metal bars 10 are perpendicular to the pouring surface when facing the pressure of the concrete, and the flange section 105 can also increase the bending stiffness. At the same time, as shown in Figure 9 , a reinforcing metal rod 106 is longitudinally inserted into the arc-shaped bending part of each metal bar 10 to increase the stiffness of the metal bar.

[0061] During the deployment of the intercepting net, the metal bars 10 outside the steel wire mesh 20 are moved to the outside of the stirrups and ties of the beam steel reinforcement framework, at which time they are blocked by the beam ties 60, so metal scissors are used to cut a length of the metal bars 10 and the steel wire mesh 20 at the position of the beam ties 60 (as shown in Figure 6 ), and then the metal bars 10 and the steel wire mesh 20 are moved to the outside of the beam ties 60 (as shown in Figure 7 ). Finally, the connecting part is fitted (as shown in Figure 8 ) to restore the stiffness of the cut metal bars 10 to the original complete state. At the same time, the cut part of the dense mesh 20 can be stitched by steel wire as needed to prevent concrete from flowing through the gap. At this time, the metal bars 10 outside have been moved to the outside of the steel reinforcement framework, and the dense mesh 20 outside the metal bars 10 has filled part of the steel reinforcement protective layer. Because the cutting of the intercepting net is greater than the width of the beam, the curved part of the dense mesh 20 can insert the metal bars 10 into the gap between the upper and lower rows of steel bars, and the concrete intercepting effect is better.

[0062] In the present application, the connecting piece 40 is sleeved at the broken part of the metal batten 10, and is fixed with the two ends of the metal batten 10 by welding, riveting or inserting. When riveting is used, the connecting piece 40 can be quickly connected with the end of the metal batten 10 by using a keel clamp. When the inserting method is used, the connecting piece 40 can be provided as a U-shaped clamping plate matched with the metal batten 10, and is inserted on the arc-shaped bent part 102 of the end of the metal batten 10 and clamped.

[0063] As shown in Figure 10 When the concrete is poured, the concrete is regarded as a liquid, and the pressure increases with the increase of the depth, so the higher the beam, the greater the pressure. Therefore, a through hole 104 corresponding to the passing-through of the tensioning screw rod 30 is formed on each metal batten 10; when the dense mesh net 20 is unfolded on the intercepting surface, it is fixed by the tensioning screw rod 30 penetrating through each metal batten 10. According to the pressure of different parts of the formwork, the number and position of the tensioning screw rod 30 are determined. The tensioning screw rod 30 is sleeved with a plastic sleeve 301, is first inserted into the corresponding through hole 104 on the metal batten 10, and a protective layer pad 302 is sleeved on the end of the plastic sleeve 301, the protective layer pad 302 and the steel reinforcement framework clamp the outer metal batten 10 in the middle, prevent it from being deviated, install the beam side formwork, or lower the steel reinforcement framework into the beam formwork, penetrate the tensioning screw rod 30, and install the screw rod sleeve to tighten and reinforce.

[0064] Further, when pouring large-size beams, considering that there are usually multiple rows of steel bars on the upper and lower parts of the beam, although the above-mentioned intercepting net can be inserted into the first row of steel bars of the upper and lower rows to achieve the intercepting effect, it cannot be further inserted into the gap of the steel bars after the second row. Therefore, in order to solve the problem of concrete interception at the lower steel bar part when multiple rows of lower steel bars appear, the cement-based steel bar pad 50 for intercepting the gap at the bottom or top of the dense mesh net 20 is also provided. Figure 11 As shown in

[0065] The cement pad 501 should have a certain strength and should not be lower than the strength of the beam concrete, the thickness of the pad should meet the requirements of the beam steel bar spacing in the specification, and it is not easy to break and break in the construction environment. Therefore, the skeleton is added in the cement base or the strength between the pad aggregates is improved, the linear material such as fiber bundle, steel bar, basalt bar can be put along the direction of the pad to resist cracking, and the material is not limited; the mixing ratio can also be adjusted, the additive agent is added, and the anti-cracking fiber improves the bonding strength of the aggregate.

[0066] The fiber 502 should have a certain bending stiffness, and the material with small bending stiffness can increase the linear density to improve the overall bending stiffness, and the material can be fine iron wire, plastic, composite material, etc. The fiber 502 penetrates the cement pad.

[0067] Firstly, the lower row of steel bars is installed, the cement-based steel bar cushion 50 is placed on the lower row of steel bars with the fibers 502 vertically perpendicular to the horizontal plane, and then the upper row of steel bars is installed. At this time, part of the fibers 502 is bent, but most of the fibers can successfully pass through the gap between the steel bars and play a role in blocking the coarse aggregate in the concrete during concrete pouring, as shown in Figure 12 .

[0068] The cement-based steel bar cushion 50 is placed during the installation of the lower steel bars in the process of beam steel bar binding, and the intercepting net composed of the metal batten 10 and the dense mesh 20 is installed after the beam framework is basically bound. After the installation of the two is completed, as shown in Figure 13 .

[0069] The construction method for concrete interception using the above device includes the following steps:

[0070] (1) Determine the type of the beam. If there are multiple rows of steel bars at the bottom of the steel cage, place the cement-based steel bar cushion 50 between the multiple rows of steel bars during the binding of the beam bottom steel bars to fill the unintercepted gap between the multiple rows of steel bars at the bottom of the beam. On the one hand, it is used to control the vertical spacing of the bottom steel bars, and on the other hand, it is used to solve the problem of concrete interception.

[0071] (2) According to the size of the beam-column joint interception surface, cut the intercepting net composed of the dense mesh 20 and the metal batten 10 to a suitable area, and then wrap it to a suitable size and place it in the steel cage. Then, unfold the intercepting net at the interception surface while avoiding the stirrups, so that the metal battens 10 on both sides slightly protrude from both sides of the steel cage; the intercepting net composed of the dense mesh 20 and the metal batten 10 is unfolded in the steel cage.

[0072] (3) During the unfolding of the intercepting net, if the beam waist steel bars or stirrups are encountered, the metal battens 10 on both sides of the corresponding part need to be cut off, and the dense mesh 20 at that part also needs to be cut open; after the intercepting net is unfolded on both sides and passes through the beam waist steel bars or stirrups at that part, the cut metal battens 10 are reconnected through the connecting piece 40, and the cut part of the dense mesh 20 is sewn together according to the need through steel wire binding;

[0073] (4) The tensioning screw 30 is sleeved with a plastic sleeve 301, then the through holes 104 on the metal battens 10 are sequentially penetrated, and the protective layer cushion 302 is sleeved on both ends of the plastic sleeve 31 to clamp the metal battens 10 on both sides on the side of the steel cage;

[0074] (5) Install the pouring mold of the beam. The side molds on both sides are provided with through holes at the positions corresponding to the tensioning screws 30; the two ends of the tensioning screw 30 penetrate through the through holes of the side molds, and a screw sleeve is installed on the outer end of the tensioning screw 30, and the beam is reinforced by rotating the screw sleeves at both ends;

[0075] (6) Pour concrete into the steel cage. The initial pouring height shall not exceed 250mm from the bottom elevation of the beam. Use a vibrator to vibrate near the dense mesh 20 and the cement-based steel reinforcement spacer 50 to ensure that the coarse aggregate of the concrete forms an effective accumulation near the two. Then, pour in layers to avoid pouring too high at one time, which would cause the concrete pressure to be too high and break through the interception range of the cement-based steel reinforcement spacer 50, resulting in a large amount of high-grade concrete flowing into the beam.

[0076] (7) After the concrete is poured and the formwork is removed, the tie rod 30 will be pulled out and reused.

[0077] When the interception net composed of dense mesh 20 and metal ribs 10 is used alone, the yield rate can reach 90%-93%. After adding cement-based steel reinforcement blocks 50 for interception, the yield rate can be further improved to 96%-97%. Figure 14 The image shown is an illustration of the concrete pouring effect achieved using a single interception net consisting of a dense mesh net 20 and metal ribs 10.

[0078] This invention provides a concept and method for intercepting concrete wire mesh of different grades at beam-column joints. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technologies.

Claims

1. A beam column joint concrete wire mesh intercepting device, characterized in that, The metal batten (10) and the dense mesh (20) are included. The metal batten (10) is a group, which is arranged in parallel and spaced. The dense mesh (20) is folded to form a dense mesh plug-in part (201) corresponding to the clamping groove (101) of each metal batten (10). The dense mesh (20) is a whole metal mesh or multiple metal meshes. The metal batten (10) is folded by a metal plate, and a clamping groove (101) is formed in the middle. The opening end of the clamping groove (101) is used for inserting the dense mesh plug-in part (201), and the closed end of the clamping groove (101) is an arc-shaped bending part (102) with prestress. The metal plate on both sides of the opening end of the clamping groove (101) is bent downward to form a chamfered part (103).

2. The beam column joint concrete wire mesh intercepting device according to claim 1, wherein, The metal plate on both sides of the opening end of the clamping groove (101) is located in the front section of the chamfered part (103), and a flange section (105) is left flat with the dense mesh (20).

3. The beam column joint concrete wire mesh intercepting device of claim 1, wherein, A reinforcing metal rod (106) is longitudinally inserted into the arc-shaped bending part (102).

4. The beam column joint concrete wire mesh intercepting device of claim 1, wherein, A through hole (104) is formed in each metal batten (10) for passing through the tensioning screw (30).

5. A method of constructing a concrete barrier using the apparatus of claim 1, characterised in that, A connecting piece (40) is further included for connecting the disconnected metal batten (10). A cement-based steel reinforcement pad (50) is further included for intercepting the gap at the bottom or top of the dense mesh (20). The following steps are included: (1) According to the size of the beam-column joint intercepting surface, the intercepting net composed of the dense mesh (20) and the metal batten (10) is cut and wrapped and then placed in the steel reinforcement cage, and then expanded at the intercepting surface, so that the metal battens (10) on both sides slightly protrude from both sides of the steel reinforcement cage; (2) During the expansion of the intercepting net, if the beam waist reinforcement or hoop reinforcement is encountered, the metal battens (10) on both sides of the corresponding edge part need to be cut off, and the dense mesh (20) at this position needs to be cut open; after the intercepting net is expanded on both sides and passes through the beam waist reinforcement or hoop reinforcement, the cut metal batten (10) is reconnected by the connecting piece (40), and the cut open part of the dense mesh (20) is stitched by steel wire according to needs; (3) The tensioning screw (30) is sleeved with a plastic sleeve (301), then sequentially penetrates the through hole (104) on the metal batten (10), and the protective layer pad (302) is sleeved at both ends of the plastic sleeve (301), so as to clamp the metal battens (10) on both sides on the side edge of the steel reinforcement cage. (4) The pouring mold of the beam is provided with through holes at the positions corresponding to the positions of the opposite pulling screw rods (30) on the two side molds; the two ends of the opposite pulling screw rods (30) pass through the through holes of the side molds, and screw rod sleeves are installed at the outer end portions of the opposite pulling screw rods (30); the screw rod sleeves at the two ends are rotated to reinforce the opposite pulling screw rods (30); (5) The concrete is poured into the reinforcement cage.

6. The construction method according to claim 5, characterized in that In step (1), the intercepting net composed of the dense mesh (20) and the metal batten (10) is unfolded vertically or obliquely in the reinforcement cage, and the unfolding avoids the stirrups.

7. The construction method according to claim 5, characterized in that, In step (2), the connecting piece (40) is sleeved at the broken position of the metal batten (10), and the connecting piece (40) is fixed with the two ends of the metal batten (10) by welding, riveting or inserting.

8. The construction method according to claim 5, characterized in that, After the concrete is poured and shaped and the mold is removed, the opposite pulling screw rods (30) are pulled out and reused.

9. The construction method according to claim 5, characterized in that, Before step (1) starts, if there are multiple rows of steel bars at the bottom of the reinforcement cage, cement-based steel bar cushion blocks (50) are placed between the multiple rows of steel bars when the beam bottom bars are bound, so as to fill the unintercepted gaps between the multiple rows of steel bars at the bottom of the beam.

Images