CN210086032U - An ultra-high performance concrete combined permanent formwork - Google Patents

Abstract

The utility model belongs to the technical field of building material, a combined permanent template of ultra high performance concrete is disclosed. The outer side of the permanent template is a plane or a curved surface, and the inner side of the permanent template is provided with ribs; four edges are thickened and provided with grooves and tongues, and the lap joint of the grooves and tongues is a hydrophobic surface; after the tongue-and-groove joint, the outer side of the template forms a seam filling groove with a small outer part and a large inner part. The four sides of the high-performance concrete combined permanent template of the utility model all adopt the tongue-and-groove design, on one hand, the permeation path length of external substances is greatly increased; on the other hand, the tongue-and-groove lapping surface is a hydrophobic surface, and the hydrophobic paste is coated before installation, so that the penetration of external substances can be effectively prevented, and the durability can be effectively improved. The ultra-high performance concrete is used as the joint mixture, and the sizes of the joint filling groove and the bolt hole are small outside and large inside, so that the ultra-high performance concrete joint mixture can be effectively prevented from falling off, and the structural durability is improved.

Description

An ultra-high performance concrete combined permanent formwork

technical field

The utility model belongs to the technical field of building materials, in particular to an ultra-high-performance concrete combined permanent formwork.

Background technique

Formwork engineering has developed along with the development of concrete engineering and has a long history at home and abroad. The permanent formwork, also known as the one-time consumption formwork, means that the formwork will not be removed after the cast-in-place concrete structure is poured. It has the advantages of simplified construction process, easy operation, improved working conditions, no or less use of formwork support, saving of formwork support and disassembly, and accelerated construction progress. At present, the main materials are steel, fiber reinforced plastics, etc. Although the production cost of permanent formwork is higher than that of traditional formwork, considering factors such as the reduction of labor, the reduction of material loss, the shortening of construction period, the enhancement of building durability, the reduction of long-term maintenance costs, energy saving and environmental protection and other factors, the use of new permanent formwork The overall engineering cost of the formwork is lower. Therefore, the permanent template has a good development prospect.

For concrete structures in chloride environments such as the ocean, seawater corrosion-resistant concrete is mainly used to improve their service life. However, in the tidal zone and splash zone where corrosion is particularly severe, due to water scouring and dry-wet cycle, the seawater corrosion-resistant concrete structure will be damaged earlier, affecting the overall life of the structure.

On the other hand, due to the poor availability of high-quality raw materials, especially high-quality admixtures, for seawater-resistant concrete, it is difficult to adopt this technical measure in many projects. There are also many large-volume concrete structures that do not need high chloride ion resistance inside, but if seawater corrosion-resistant concrete is used, all of them need to be used, resulting in waste of materials and higher construction costs.

Considering that the poor structural durability in the marine environment is mainly due to the corrosion of the internal steel bars and the damage of the external concrete, in order to further improve the structural life in the marine environment, it is proposed to use the permanent formwork of ultra-high performance concrete as the outer layer of the structure, and the internal use of ordinary concrete. Reduce the cost and consumption of high-quality raw materials, and make the best use of everything.

Ultra-high-performance concrete is a high-performance cement-based material developed at the end of the 20th century. It was originally reactive powder concrete (RPC) developed in France in 1993. At present, ultra-high-performance concrete is mainly used in the construction of highways and bridges abroad, structural maintenance and reinforcement.

The use of ultra-high-performance concrete to prepare permanent formwork can give full play to the advantages of ultra-high-performance concrete and solve the problem of low durability of seawater-resistant concrete in tidal and splash zones. It is a good use for ultra-high-performance concrete applications. , is also a frontier topic in the world.

As for the permanent formwork of ultra-high performance concrete used as concrete structure, there are only a few conceptual designs and experimental studies, and its form is only a simple plate or integral formwork.

In actual engineering, except for some small-sized columns that can use integral permanent formwork, a large number of bridge piers, piers, retaining walls and other structures are too large to use integral permanent formwork, and combined permanent formwork must be used. However, when the combined permanent formwork is used, it is inevitable that there will be formwork joints. The formwork joints are the weak link of the structural members, and the leakage caused by them is also the main problem affecting the structural durability. How to effectively solve this problem The question is one of the key issues of whether the combined permanent formwork of ultra-high performance concrete can be used. In addition, whether the combined permanent formwork can have a good connection with the internal concrete to avoid voids and cause internal communication channels is also crucial to ensuring the durability of the concrete structure.

Utility model content

In view of the above shortcomings and deficiencies in the prior art, the purpose of the present utility model is to provide an ultra-high performance concrete combined permanent formwork.

The purpose of this utility model is achieved through the following technical solutions:

An ultra-high-performance concrete combined permanent formwork, the outer side of the permanent formwork is a plane or a curved surface, and the inner side is ribbed; the four sides are thickened, and grooves are arranged, and the lap joint of the grooves is a hydrophobic surface; A caulking groove is formed on the outside of the template after overlapping.

Further, the thickness of the edge of the permanent formwork is 30-80mm, the thickness of the edge and the inter-rib area is not less than 15mm and not greater than the thickness of the rib, the ribs are arranged horizontally, longitudinally or obliquely, and the height of the rib does not exceed the edge. the height of the part.

Further, the inner side of the permanent template and the intercostal area are scattered with gravel or pressed dents, and the projected area of the gravel or the dent accounts for 1% to 50% of the area of the side and the intercostal area. By spreading gravel or pressing dents, a bumped surface can be created on the inside of the permanent form to increase the bond between the permanent form and the post-cast concrete.

Further, the nominal particle size of the crushed stone is 16 to 31.5 mm, the projected area of the crushed stone accounts for 10% to 20% of the area of the edge and the intercostal area, and the crushed stone is partially embedded in the template; the dent is a diameter of It is a circle of 10-30mm, the projected area of the dent accounts for 10%-20% of the area of the edge and the intercostal area, the depth of the dent is 5-10mm, and the thickness of the template at the dent is not less than 10mm.

Further, the grooves of the upper and lower sides of the permanent formwork are set as a corresponding arc-shaped protrusion and groove to form a slot, and its height or depth is 10-30mm; the left and right parts of the permanent formwork The tongue and groove are set as a corresponding rectangular or trapezoidal protrusion and depression, and its length is 20-100mm.

Further, the caulking groove formed on the outside of the template after the tongue and groove overlap is small on the outside and large on the inside, and the width of the outside is 5-15 mm.

Further, the main material of the permanent formwork is stainless steel wire mesh or fiber mesh reinforced ultra-high performance concrete, and the rib and edge materials are stainless steel steel bars, fiber bars, high-strength steel bars or prestressed steel bars reinforced ultra-high performance concrete.

Further, each of the four corners of the permanent formwork is provided with a bolt hole, the bolt hole is designed to be small on the outside and large on the inside, and a circular reinforcing rib is designed on the inner side of the bolt hole position, and is connected to the ribs on both sides through the reinforcing bar. The plate thickness at the hole location is the same as the rib.

Further, pre-embedded nuts are installed on the ribs of the permanent formwork, and the pre-embedded nuts are connected with the steel bars in the ribs to prevent them from coming out. Embedded nuts are used to install shear keys to further increase shear resistance. The length of the shear key should not be less than 5cm, and the shear key should be installed before the template is installed.

The ultra-high performance concrete combined permanent formwork of the present invention has the following advantages and beneficial effects:

(1) The ultra-high performance concrete permanent formwork itself has high strength and good durability, and can effectively protect the internal concrete.

(2) The template adopts ribbed design, which is light in weight, convenient for transportation and installation, can be spliced in all directions, and has good engineering adaptability.

(3) The four sides of the template are designed with tongue and groove. On the one hand, the length of the penetration path of external substances is greatly increased; on the other hand, the lap joint of the tongue and groove is a hydrophobic surface. The penetration of substances can effectively improve the durability.

(4) The use of ultra-high performance concrete as the caulking agent, and the size of the caulking groove and the bolt hole is small on the outside and large on the inside, which can effectively prevent the escape of the ultra-high performance concrete caulking agent and prevent the penetration of external substances such as seawater.

(5) The edge of the formwork and the intercostal area use the method of spreading gravel to form the concavity and convexity of the inner surface, so that the formwork and the internal concrete are closely combined, effectively avoiding the penetration path caused by the emptying of the formwork, and improving the durability of the structure. A certain amount of gravel is embedded on the inner surface of the formwork obtained by this method, and the post-cast concrete wraps the embedded gravel into a whole, which effectively solves the void problem of the internal concrete and the external formwork. Compared with the traditional methods of preparing concave-convex grooves, concave-convex patterns, adding shear nails, etc., no template is required, and the construction is convenient and low in cost.

(6) The edge of the formwork and the inter-rib area can also be pressed to increase the unevenness of the inner surface, so that the formwork and the internal concrete are closely combined, effectively avoiding the penetration path caused by the formwork emptying, and improving the structural durability. Compared with the traditional way of pouring concave-convex patterns, the formwork surface for pressing dents does not need a formwork, and the surface of the parts without pressing dents is rough, and when pressing dents, the concrete near the dents will bulge, further increasing the roughness.

Description of drawings

Fig. 1 is the overall structure schematic diagram after the splicing of the ultra-high performance concrete combined permanent formwork of embodiment 1;

Fig. 2 is the inner side structure schematic diagram of the ultra-high performance concrete combined permanent formwork of embodiment 1;

Fig. 3 is the partial enlarged structural schematic diagram in Fig. 2;

Fig. 4 is the outer side structure schematic diagram of the ultra-high performance concrete permanent formwork of embodiment 1;

Fig. 5 is the partial enlarged structural schematic diagram of the left side in Fig. 4;

6 is an enlarged view of the caulking groove formed on the outside of the formwork after the tongue and groove overlap of the upper and lower edges of the ultra-high performance concrete permanent formwork of Example 1;

7 is an enlarged view of the caulking groove formed on the outside of the formwork after the tongue and groove overlap of the left and right edges of the ultra-high performance concrete permanent formwork of Example 1;

Fig. 8 is the structural representation of the inner dent of the ultra-high performance concrete permanent formwork in Example 1;

Fig. 9 is the structural representation of the inner side gravel of the ultra-high performance concrete permanent formwork in Example 2;

FIG. 10 is a schematic diagram of the bolt hole structure reinforcement of the ultra-high performance concrete permanent formwork in Example 2. FIG.

Detailed ways

The present utility model will be described in further detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present utility model are not limited thereto.

Example 1

An ultra-high performance concrete combined permanent formwork of the present embodiment, the schematic diagram of the structure is shown in Figures 1-5. The outer side of the permanent formwork is a plane, the size is 900×600mm, the plane thickness is 15mm, and the plane material is ultra-high performance concrete reinforced with organic fiber mesh; Set three ribs 102, the width of the ribs is 30mm, and the height of the ribs does not exceed the height of the side; The groove and mouth of the lower side are set as a corresponding semicircular protrusion 401 and a groove 402 to form a slot, the height or depth of which is 10 mm. The tongue and groove of the left part and the right part are set as a corresponding rectangular convex 403 and a concave 404, the length of which is 20mm. After the tongue and groove are overlapped, a caulking groove 501 is formed on the outside of the template. The size of the caulking groove 501 is small on the outside and large on the inside, the width of the outer side is 5mm, the width of the inner side is 7mm, and the depth of the caulking groove is 5mm. The rib and edge materials are ultra-high performance concrete reinforced with glass fiber reinforcement, and the thickness of the protective layer is 10mm. Figure 6 shows an enlarged view of the caulking groove formed on the outside of the formwork after the upper and lower edges of the ultra-high performance concrete permanent formwork are overlapped; The diagram is shown in Figure 7.

The inner side of the permanent formwork and the intercostal area are pressed with dents 200 to form a concave-convex surface, the schematic diagram of which is shown in Figure 8, to increase the bond between the permanent formwork and the post-cast concrete. The pressed dent is circular, the diameter of the circle is 10 mm, the projected area of the dent accounts for 10% of the area of the edge and intercostal area of the permanent template, and the depth of the dent is 5 mm.

Three embedded nuts 602 with a diameter of 20mm are further installed on each transverse rib on the inner side of the permanent formwork for installing shear keys to further increase the shear resistance performance. The embedded nut is connected to the fiberglass reinforcement in the internal rib to prevent it from coming out. The length of the shear key is 8cm, and the shear key is installed before the template is installed.

The ultra-high performance concrete of this embodiment has ultra-high strength and ultra-high durability, the compressive strength is 145MPa, and the electricity value is 18C. The ultra-high performance concrete contains PVA organic fibers to enhance crack resistance.

The application of the above-mentioned ultra-high-performance concrete combined permanent formwork in concrete pouring of buildings, the application process is: before the permanent formwork is installed, the water-repellent lap surface is coated with hydrophobic paste, and then the adjacent ultra-high The permanent formwork of high-performance concrete forms the formwork of the building through the form of tongue and groove lap, and then pours concrete in the formwork of the building. Joint compound, finish pouring.

Example 2

An ultra-high performance concrete combined permanent formwork of this embodiment, the outer side of the permanent formwork is a plane, the size is 3000×2400mm, the plane thickness is 30mm, and the plane material is ultra-high performance concrete reinforced with stainless steel wire mesh; the inner side is ribbed , the ribs are arranged horizontally and vertically, 2 ribs are arranged vertically, 3 ribs are arranged horizontally, the width of the ribs is 40mm, and the height of the ribs does not exceed the height of the side; the thickness of the four sides is 50mm, and the tongue and groove are set. The lap joint is a hydrophobic surface; the grooves on the upper and lower sides of the permanent formwork are set as a corresponding semi-circular protrusion and groove to form a slot, and its height or depth is 20mm. The tongue and groove of the left part and the right part are set as a corresponding rectangular convex and concave, the length of which is 50mm. After the tongue and groove are overlapped, a caulking groove is formed on the outside of the formwork. The size of the caulking groove is small on the outside and large on the inside, the width of the outer side is 5mm, the width of the inner side is 7mm, and the depth of the caulking groove is 10mm. The rib and edge materials are ultra-high performance concrete reinforced with high-strength steel bars, and the thickness of the steel bar protection layer is 10mm.

The edges and intercostal areas of the permanent formwork are scattered with gravel 300 to form a concave-convex surface, the schematic diagram of which is shown in FIG. ~26.5mm, the projected area of crushed stone accounts for 15% of the area of the edge and intercostal area of the permanent formwork, and vibration is applied to the concrete after spreading the crushed stone, so that the crushed stone is embedded in the concrete.

Three embedded nuts with a diameter of 20mm are further installed on each transverse rib on the inner side of the permanent formwork for installing shear keys to further increase the shear resistance. Pre-embedded nuts are connected to high-strength steel bars in internal ribs to prevent breakout. The length of the shear key is 8cm, and the shear key is installed before the template is installed.

Each of the four corners of the permanent template is provided with a bolt hole 601. The bolt hole is designed to be small on the outside and large on the inside. The position of the bolt hole is 1/6 of the height direction and 1/5 of the width direction. The position of the bolt hole is designed The circular reinforcing rib is connected with the longitudinal and transverse ribs on both sides to form a whole. The thickness of the plate at the position of the bolt hole is consistent with the rib. The schematic diagram of the reinforcement is shown in Figure 10.

The ultra-high performance concrete of this embodiment has ultra-high strength and ultra-high durability, the compressive strength is 155MPa, and the electricity value is 15C. The ultra-high-performance concrete contains stainless steel fibers to enhance crack resistance.

The application of the above-mentioned ultra-high-performance concrete combined permanent formwork in the concrete pouring of buildings, the application process is: before the permanent formwork is installed, the water-repellent paste is applied to the water-repellent lap surface of the groove and mouth, and then the adjacent ultra-high-performance concrete is applied. The high-performance concrete permanent formwork forms the formwork of the building through the form of tongue and groove lap, and then pours concrete in the formwork of the building. After the concrete is poured, the super-high-performance concrete is filled in the joint slot and bolt hole of the permanent formwork. Filler to finish pouring.

Example 3

An ultra-high performance concrete combined permanent formwork of this embodiment, the outer side of the permanent formwork is a plane, the size is 4500×2400mm, the plane thickness is 40mm, the plane material is ultra-high performance concrete reinforced with stainless steel wire mesh; the inner side is ribbed , the ribs are arranged horizontally and vertically, 2 ribs are arranged vertically, 5 ribs are arranged horizontally, the width of the rib is 50mm, and the height of the rib is the same as the height of the side; The lap joint is a hydrophobic surface; the grooves on the upper and lower sides of the permanent formwork are set as a corresponding arc-shaped protrusion and groove to form a slot, and its height or depth is 30mm. The tongue and groove of the left part and the right part are set as a corresponding rectangular convex and concave, the length of which is 100mm. After the tongue and groove are overlapped, a caulking groove is formed on the outside of the formwork. The size of the caulking groove is small on the outside and large on the inside, the width of the outer side is 8mm, the width of the inner side is 10mm, and the depth of the caulking groove is 10mm. The rib and edge materials are ultra-high performance concrete reinforced with prestressed steel bars, and the thickness of the steel bar protection layer is 15mm.

The inner edge of the permanent formwork and the intercostal area are pressed with dents to form a concave-convex surface, so as to increase the bond between the permanent formwork and the post-cast concrete. The pressed dents are circular, the diameter of the circle is 20mm, the projected area of the dents accounts for 20% of the area of the edge and the intercostal area of the permanent template, and the depth of the dents is 10mm.

Four embedded nuts with a diameter of 20mm are further installed on each transverse rib on the inner side of the permanent formwork for installing shear keys to further increase the shear resistance. The embedded nut is connected to the prestressed steel bar in the rib to prevent it from coming out. The length of the shear key is 8cm, and the shear key is installed before the template is installed.

Each of the four corners of the permanent formwork is provided with a bolt hole. The bolt hole is designed to be small on the outside and large on the inside. The position of the bolt hole is 1/6 of the height direction and 1/5 of the width direction. The bolt hole position is designed to be round. It is connected with the longitudinal and transverse ribs on both sides to form a whole through the reinforcement, and the thickness of the plate at the position of the bolt hole is the same as that of the rib.

The ultra-high-performance concrete combined permanent formwork of this embodiment has ultra-high strength and ultra-high durability, the compressive strength is 165MPa, the electricity value is 12C, and the stainless steel fiber is contained to enhance crack resistance.

The application of the above-mentioned ultra-high performance concrete combined permanent formwork in the concrete pouring of buildings, the application process is: before the permanent formwork is installed, the water-repellent paste is applied to the water-repellent lap joint, and then the adjacent ultra-high The permanent formwork of high-performance concrete forms the formwork of the building through the form of tongue and groove lap, and then pours concrete in the formwork of the building. Joint compound, finish pouring.

The above-mentioned embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited by the above-mentioned embodiments, and any other changes, modifications, and substitutions made without departing from the spirit and principle of the present utility model , combination and simplification, all should be equivalent replacement methods, which are all included in the protection scope of the present invention.

Claims (9)

1. an ultra-high performance concrete combined permanent formwork, it is characterized in that: the outer side of the described permanent formwork is a plane or a curved surface, and the inner side is ribbed; Hydrophobic surface; fill grooves are formed on the outside of the formwork after the tongue and groove are overlapped. 2. A kind of ultra-high performance concrete combined permanent formwork according to claim 1, characterized in that: the thickness of the edge of the permanent formwork is 30-80mm, and the thickness of the edge and the intercostal area is not less than 15mm and not less than 15mm. Greater than the thickness of the rib, the ribs are arranged laterally, longitudinally or obliquely, and the height of the rib does not exceed the height of the edge. 3. A kind of ultra-high performance concrete combined permanent formwork according to claim 1 is characterized in that: the inner side of the permanent formwork and the intercostal area are scattered with gravel or pressed dents, and the The projected area accounts for 1% to 50% of the area of the edge and intercostal regions. 4. A kind of ultra-high performance concrete combined permanent formwork according to claim 3, it is characterized in that: the nominal particle diameter of described crushed stone is 16～31.5mm, and the projected area of crushed stone occupies edge part and intercostal area 10%~20% of the area, the gravel is partially embedded in the template; the dent is a circle with a diameter of 10~30mm, and the projected area of the dent accounts for 10%~20% of the area of the edge and intercostal area. The depth is 5~10mm, and the thickness of the template at the dent is not less than 10mm. 5. An ultra-high performance concrete combined permanent formwork according to claim 1, characterized in that: the tongue and groove of the upper edge and the lower edge of the permanent formwork are set as a corresponding arc-shaped protrusion and groove, forming a The height or depth of the card slot is 10~30mm; the grooves on the left and right sides of the permanent formwork are set as a corresponding rectangular or trapezoidal protrusion and depression, and the length is 20~100mm. 6 . The ultra-high performance concrete combined permanent formwork according to claim 1 , wherein the caulking grooves formed on the outside of the formwork after the tongue and groove overlap are small on the outside and large on the inside, and the width on the outside is 5-15 mm. 7 . 7. A kind of ultra-high performance concrete combined permanent formwork according to claim 1, it is characterized in that: described permanent formwork main body material is the ultra-high performance concrete reinforced by stainless steel wire mesh or fiber mesh, and rib and edge material are Ultra-high performance concrete reinforced with stainless steel rebar, fiber rebar, high-strength rebar or prestressed rebar. 8. An ultra-high performance concrete combined permanent formwork according to claim 2, characterized in that: each of the four corners of the permanent formwork is provided with a bolt hole, and the bolt hole is designed to be small on the outside and large on the inside. A circular reinforcing rib is designed on the inner side of the position, and is connected with the ribs on both sides to form a whole. The thickness of the plate at the position of the bolt hole is the same as that of the rib. 9 . The combined permanent formwork of ultra-high performance concrete according to claim 7 , wherein embedded nuts are installed on the ribs of the permanent formwork, and the embedded nuts are connected to the steel bars in the ribs. 10 .

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