An assembled bonded post-tensioned 3D printed concrete column and construction method

Abstract

The present invention discloses a prefabricated bonded post-tensioned 3D printed concrete column and a construction method. During the 3D printing process of the concrete column matrix, ducts are reserved along the height direction. After the concrete is cured to the specified strength, the prestressed tendons are passed through the reserved ducts and tensioned and anchored. The present invention combines the prestressed tendons with the 3D printed concrete column and applies it to the prefabricated process. The construction method is convenient, does not require formwork, saves materials, and has good seismic performance.

Description

Technical Field

[0001] The present invention relates to the field of civil engineering construction, and particularly relates to a prefabricated bonded post-tensioned 3D printed concrete column and a construction method thereof. Background Art

[0002] Prefabricated construction techniques have been widely applied in the field of civil engineering construction due to their advantages such as the ability to mass-produce building components standardized, being unaffected by weather factors, and saving labor costs. With the implementation of the national energy conservation and emission reduction policies, prefabricated buildings will also become the development trend of the construction industry. However, due to the poor seismic performance of prefabricated concrete structures and the need to transport concrete components from the factory to the construction site, the construction cost of prefabricated buildings is high. Summary of the Invention

[0003] Object of the Invention: Aiming at the above existing problems, the present invention provides a prefabricated bonded post-tensioned 3D printed concrete column and a construction method thereof. Compared with traditional prefabricated cast-in-place concrete columns, its construction method is simple, can be printed at the construction site of the building, and saves the transportation cost of components.

[0004] The present invention adopts the following technical solutions: A prefabricated bonded post-tensioned 3D printed concrete column, comprising: a concrete column matrix, a concrete joint area, a precision rolled threaded steel bar, an anchor and a grouting body;

[0005] The concrete column matrix is made by means of layer-by-layer 3D printing. The concrete column matrix includes multiple layers of concrete strips, and the directions of adjacent two layers of concrete strips are perpendicular to each other; a through prestressed tendon duct is reserved inside the concrete column matrix along the height direction, and an anchor groove communicating with the prestressed tendon duct is reserved at the top of the concrete column matrix, and the top and bottom of the concrete column matrix for assembling the bottom layer are both reserved with anchor grooves communicating with the prestressed tendons;

[0006] The concrete joint area connects the upper and lower concrete column matrices. A communicating prestressed tendon duct is reserved in the concrete joint area along the height direction, and an anchor groove communicating with the prestressed tendon duct is reserved at the top of the concrete joint area; the prestressed tendon duct and the anchor groove in the concrete joint area and the prestressed tendon ducts and anchor grooves in the concrete column matrices at its upper and lower ends are located at the same projection position;

[0007] The precision rolled threaded steel bar is fixed in the reserved prestressed tendon duct;

[0008] The anchor includes a precision rolled backing plate and a precision rolled nut, and the precision rolled backing plate and the precision rolled nut are arranged in the reserved anchor groove;

[0009] The grouting material is filled in the prestressed tendon ducts and anchor grooves reserved inside the concrete column matrix and the concrete joint area, so that the deformed threaded steel bars are firmly bonded to the concrete column matrix and the concrete joint area to form a complete cast-in-place body.

[0010] Preferably, the overlapping width between the concrete strips, that is, the overlapping part width between the juxtaposed extrusion sections, is 1 / 4 of the diameter of the printing nozzle.

[0011] Preferably, the anchor in the concrete joint area consists of a deformed nut, a deformed backing plate and a metal connecting sleeve. The deformed nut is located on the upper side of the deformed backing plate and is in close contact with the deformed backing plate, and the metal connecting sleeve is located on the upper side of the deformed nut.

[0012] Preferably, when the anchor is in the anchor groove at the bottom of the bottom-layer concrete column matrix, the deformed nut is located on the lower side of the deformed backing plate.

[0013] Preferably, square longitudinal tendon ducts and square anchor grooves are reserved along the height direction inside the concrete column matrix.

[0014] A construction method for the above-mentioned prefabricated bonded post-tensioned 3D printed concrete column includes the following steps:

[0015] The first step: layer by layer print the concrete column matrix for the bottom layer, reserve a through prestressed tendon duct along the height direction of the concrete column matrix, and reserve anchor grooves communicating with the prestressed tendon duct at the top and bottom of the concrete column matrix.

[0016] The second step: insert deformed threaded steel bars into the concrete column matrix. The length of the deformed threaded steel bars exposed outside the anchor groove at the top of the column shall not be less than the height of the concrete joint area, and the deformed threaded steel bars shall not be exposed outside the anchor groove at the bottom of the column. Use an anchor consisting of a deformed nut and a deformed backing plate to fix the deformed threaded steel bars in the prestressed tendon ducts in the concrete column matrix, carry out tensioning and anchoring on the deformed threaded steel bars, and pour grouting material into the prestressed tendon ducts in the concrete column matrix and the anchor groove at the bottom of the column.

[0017] The third step: prefabricate the concrete joint area for connecting the upper and lower concrete column matrices. The concrete joint area is reserved with a through prestressed tendon duct along the height direction, and an anchor groove communicating with the prestressed tendon duct is reserved at the top of the concrete joint area. The prestressed tendon ducts and anchor grooves in the concrete joint area and the prestressed tendon ducts and anchor grooves in the concrete column matrices at its upper and lower ends are located at the same projection position.

[0018] The fourth step: hoist the prefabricated concrete joint area and butt it with the above-mentioned concrete column matrix after tensioning and anchoring.

[0019] Let the rolled thread ribbed steel bars exposed on the concrete column matrix pass through the prestressed tendon ducts and anchor grooves reserved in the concrete joint area, tension and anchor the above-mentioned rolled thread ribbed steel bars in the anchor grooves within the concrete joint area, trim the length of the rolled thread ribbed steel bars exposed outside the rolled thread nuts to half of the length of the selected metal connecting sleeve and insert them into the metal connecting sleeve, with the bottom of the metal connecting sleeve closely attached to the rolled thread nuts. Insert another section of rolled thread ribbed steel bar into the above-mentioned metal connecting sleeve for lapping, and the length of the above-mentioned other section of rolled thread ribbed steel bar shall not be less than the sum of the heights of the concrete column matrix and the concrete joint area. Grout the prestressed tendon ducts within the concrete joint area and the anchor grooves at the top of the concrete column matrix at its lower end.

[0020] Step 5: Hoist another printed concrete column matrix and dock it with the above-mentioned concrete joint area, so that the rolled thread ribbed steel bars exposed on the concrete joint area pass through the prestressed tendon ducts and anchor grooves reserved in this concrete column matrix

[0021] and tension and anchor the rolled thread ribbed steel bars in the anchor grooves at the top of this concrete column matrix, and grout the prestressed tendon ducts within this concrete column matrix and the anchor grooves at the top of the joint area at its lower end.

[0022] Step 6: Repeat the construction techniques of Step 4 and Step 5 until the building is assembled to the top, and grout the anchor grooves at the top of the top-layer concrete column matrix.

[0023] Preferably, in the second step, the concrete joint area can be cast-in-place prefabricated or 3D printed prefabricated.

[0024] Beneficial effects: The present invention uses prestressed tendons to stiffen the 3D printed concrete column matrix and the joint area between the concrete column matrices, significantly improving the stiffness and seismic performance of the concrete column matrix and ensuring the safety of the building structure. The present invention combines prestressed tendons with 3D printed concrete columns and applies them to the assembly process. The construction method is convenient, without the need for formwork, saves materials, and has good seismic performance. Description of the Drawings

[0025] Figure 1 and 2 are the schematic structural diagrams of an assembled bonded post-tensioned prestressed 3D printed concrete column of the present invention patent. Among them, Figure 1 is the schematic structural diagram for assembling the bottom-layer 3D printed concrete column matrix, Figure 2 is the schematic structural diagram for assembling the second-layer to top-layer 3D printed concrete column matrices.

[0026] Figure 3 is the schematic structural diagram of the concrete column joint area of the present invention.

[0027] Figure 4Schematic diagram of the nut anchor for anchoring the fine - rolled threaded steel bar of the present invention.

[0028] Figure 5 Schematic diagram of the arrangement of the anchor in the anchor groove of the concrete joint area of the present invention.

[0029] Figure 6 Schematic diagram of the structure after the assembly of the concrete column matrix and the joint area of the present invention.

[0030] Wherein: 1 is the concrete column matrix, 2 is the concrete joint area, 3 is the prestressed tendon duct, 4 is the anchor groove, 5 is the fine - rolled threaded steel bar, 6 is the fine - rolled nut, 7 is the fine - rolled backing plate, and 8 is the metal connecting sleeve. Specific implementation mode

[0031] The technical solution of the entire invention will be described in detail below in conjunction with the drawings and specific implementation modes.

[0032] As Figures 1-6 shown, a prefabricated bonded post - tensioned 3D - printed concrete column includes:

[0033] The concrete column matrix 1, which is made by the layer - by - layer vertical cross 3D printing method. The width of a single concrete strip forming the concrete column matrix 1 is 20 mm, the height is 10 mm, the cross - sectional dimension of the concrete column matrix 1 is 480 mm × 480 mm, and the height is 3000 mm. Four through - hole prestressed tendon ducts 3 are reserved along the height direction inside the concrete column matrix 1, and the cross - sectional dimensions of the prestressed tendon ducts 3 are all 40 mm × 40 mm. The cross - sectional dimensions of the anchor grooves 4 in the concrete column matrix 1 are all 120 mm × 120 mm, and the height is 250 mm.

[0034] The fine - rolled threaded steel bar 5, which is a high - strength prestressed fine - rolled threaded steel bar, with the material of PSB1080, a diameter of 20 mm, and a length of 3800 mm.

[0035] The fine - rolled nut 6, which is an M20 hexagonal fine - rolled nut, with the width across the flats of 32 mm and the height of 45 mm.

[0036] The fine - rolled backing plate 7, with the cross - sectional dimension of 100 mm × 100 mm and the thickness of 10 mm.

[0037] The grouting body, which fills the voids between the fine - rolled threaded steel bar 5 and the prestressed tendon ducts 3 and the anchor grooves 4. The material of the grouting body is Portland cement, and the water - cement ratio is 0.4 - 0.45.

[0038] The construction method of the above - mentioned prefabricated bonded post - tensioned 3D - printed concrete column includes the following steps:

[0039] Step 1: Layer by layer, print the concrete column matrix 1 for the bottom layer in a vertically cross-printed manner. The printed cross-sectional dimension of each layer is 480 mm × 480 mm. Along the height direction of the concrete column matrix 1, prestressed tendon ducts 3 with a cross-sectional dimension of 40 mm × 40 mm are reserved. At the top and bottom of the column, anchor grooves 4 with a size of 120 mm × 120 mm and connected to the prestressed tendon ducts 3 are reserved.

[0040] Step 2: Insert the precision rolled threaded steel bars 5 into the prestressed tendon ducts 3 inside the above-mentioned concrete column matrix 1. The length of the precision rolled threaded steel bars 5 exposed outside the concrete column matrix 1 is 800 mm. In the anchor grooves 4 inside the concrete column matrix 1, fix the above-mentioned precision rolled threaded steel bars 5 using precision rolled nuts 6 and precision rolled backing plates 7. The fixing method is: the precision rolled nut 6 is located on the upper side of the precision rolled backing plate 7 and is in close contact with the precision rolled backing plate 7. Tension and anchor the precision rolled threaded steel bars 5, and grout into the prestressed tendon ducts 3 through the grouting holes reserved on the precision rolled backing plate 7 at the top anchor groove of the column.

[0041] Step 3: Prefabricate the concrete joint domain 2 for connecting two upper and lower concrete column matrices 1. The height of the concrete joint domain 2 is 500 mm. The concrete joint domain 2 is reserved with continuously connected prestressed tendon ducts 3 along the height direction, and an anchor groove 4 connected to the above-mentioned prestressed tendon ducts 3 is reserved at the top of the concrete joint domain 2. The prestressed tendon ducts 3 and anchor grooves 4 inside the concrete joint domain 2 have the same shape and area as those inside the concrete column matrices 1 at its upper and lower ends and are located at the same projection position. It should be noted that the concrete joint domain can be precast in-situ or precast by 3D printing.

[0042] Step 4: Hoist the prefabricated concrete joint domain 2 and dock it with the concrete column matrix 1 that has been tensioned, anchored, and grouted. Insert the precision rolled threaded steel bars 5 with a length of 800 mm outside the concrete column matrix 1 into the prestressed tendon ducts 3 and anchor grooves 4 inside the above-mentioned concrete joint domain 2. The length of the prestressed tendons exposed outside the top anchor groove 4 of the above-mentioned concrete joint domain 2 is 300 mm. Use one precision rolled nut 6 and one precision rolled backing plate 7 to fix the precision rolled threaded steel bars 5 in the concrete joint domain 2 inside the anchor groove 4 of the concrete joint domain 2 (the precision rolled nut 6 is located on the upper side of the precision rolled backing plate 7). After fixing, tension and anchor the precision rolled threaded steel bars 5 inside the above-mentioned concrete joint domain 2. Trim the precision rolled threaded steel bars 5 exposed outside the precision rolled nut 6 to 100 mm and insert them into a metal connecting sleeve 8 with a length of 200 mm and an outer diameter of 50 mm. The bottom of the metal connecting sleeve 8 is in close contact with the precision rolled nut 6. Select another four precision rolled threaded steel bars 5 with a length of 3800 mm and insert them into the metal connecting sleeve 8 for lapping. After lapping, grout into the prestressed tendon ducts 3 inside the concrete joint domain 2 and the anchor grooves 4 at the top of the concrete column at its lower end through the grouting holes on the precision rolled backing plate 7.

[0043] Step 5: Hoist another concrete column base body 1 with a height of 3000 mm (this concrete column base body 1 is used for assembling the second standard floor to the top floor, so only anchor grooves 4 are reserved at the top) and dock it with the above-mentioned concrete joint area 2, so that the fine rolled threaded steel bar 5 exposed from the concrete joint area 2 passes through the prestressed tendon duct 3 and the anchor groove 4 reserved in the concrete column base body 1. Fix the fine rolled threaded steel bar 5 in the anchor groove 4 at the top of the concrete column base body 1 by using a fine rolled nut 6 and a fine rolled backing plate 7 (the fine rolled nut 6 is located on the upper side of the fine rolled backing plate 7). After the fixing is completed, tension and anchor the fine rolled threaded steel bar 5, and grout the prestressed tendon duct 3 in the concrete column base body 1 and the anchor groove 4 at the top of the concrete joint area 2 at its lower end.

[0044] Step 6: Repeat the construction techniques of Step 4 and Step 5 until the building is assembled to the top, and grout the anchor groove 4 at the top of the top floor concrete column base body 1.

[0045] It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A prefabricated bonded post-tensioned 3D printed concrete column, characterized in that: Including: Concrete column matrix, concrete joint area, rolled thread steel bars, anchor fittings and grouting material; The concrete column matrix is made by layer-by-layer 3D printing. The concrete column matrix includes multiple layers of concrete strips, and the directions of adjacent two layers of concrete strips are perpendicular to each other. A through prestressed tendon duct is reserved inside the concrete column matrix along the height direction, and an anchor groove communicated with the prestressed tendon duct is reserved at the top of the concrete column matrix for assembling. The bottom layer of the concrete column matrix has anchor grooves communicated with the prestressed tendons reserved at both the top and the bottom; The concrete joint area connects two concrete column matrices above and below. A communicated prestressed tendon duct is reserved in the concrete joint area along the height direction, and an anchor groove communicated with the prestressed tendon duct is reserved at the top of the concrete joint area. The prestressed tendon duct and the anchor groove in the concrete joint area are located at the same projection position as the prestressed tendon duct and the anchor groove in the concrete column matrices at its upper and lower ends; The rolled thread steel bars are fixed in the reserved prestressed tendon ducts; The anchor fittings include rolled thread backing plates and rolled thread nuts, and the rolled thread backing plates and the rolled thread nuts are arranged in the reserved anchor grooves; The grouting material is filled in the prestressed tendon ducts and the anchor grooves reserved inside the concrete column matrix and the concrete joint area, so that the rolled thread steel bars and the concrete column matrix and the concrete joint area are firmly bonded to form a complete cast-in-place body.

2. The prefabricated bonded post-tensioned 3D printed concrete column according to claim 1, wherein: The overlapping width between the concrete strips, that is, the overlapping part width between the juxtaposed extrusion sections, is 1 / 4 of the diameter of the printing nozzle.

3. The prefabricated bonded post-tensioned 3D printed concrete column according to claim 1, wherein: The anchor fittings in the concrete joint area are composed of one rolled thread nut, one rolled thread backing plate and one metal connecting sleeve. The rolled thread nut is located on the upper side of the rolled thread backing plate and is in close contact with the rolled thread backing plate, and the metal connecting sleeve is located on the upper side of the rolled thread nut.

4. The prefabricated bonded post-tensioned 3D printed concrete column according to claim 1, characterized in that: When the anchor fittings are located in the anchor groove at the bottom of the bottom-layer concrete column matrix, the rolled thread nut is located on the lower side of the rolled thread backing plate.

5. A prefabricated bonded post-tensioned 3D printed concrete column according to claim 1, characterized in that: A through square longitudinal bar duct and a square anchor groove are reserved inside the concrete column matrix along the height direction.

6. The construction method of an assembled bonded post-tensioned prestressed 3D printed concrete column according to claim 1, 2, 3, 4 or 5, characterized in that: Including the following steps: The first step: Layer-by-layer print the concrete column matrix for assembling the bottom layer, reserve a through prestressed tendon duct along the height direction of the concrete column matrix, and reserve anchor grooves communicated with the prestressed tendon duct at the top and the bottom of the concrete column matrix; The second step: Insert rolled thread steel bars into the concrete column matrix. The length of the rolled thread steel bars exposed outside the anchor groove at the top of the column shall not be less than the height of the concrete joint area, and the rolled thread steel bars shall not be exposed outside the anchor groove at the bottom of the column. Use the anchor fittings composed of rolled thread nuts and rolled thread backing plates to fix the rolled thread steel bars in the prestressed tendon ducts in the concrete column matrix, carry out tensioning and anchoring on the rolled thread steel bars, and pour grouting material into the prestressed tendon ducts in the concrete column matrix and the anchor groove at the bottom of the column; The third step: Prefabricate the concrete joint area for connecting two concrete column matrices above and below. A communicated prestressed tendon duct is reserved in the concrete joint area along the height direction, and an anchor groove communicated with the prestressed tendon duct is reserved at the top of the concrete joint area. The prestressed tendon duct and the anchor groove in the concrete joint area are located at the same projection position as the prestressed tendon duct and the anchor groove in the concrete column matrices at its upper and lower ends; Step 4: Hoist and connect the prefabricated concrete joint area to the concrete column matrix after the above-mentioned tensioning and anchoring are completed, so that the rolled thread steel bars exposed from the concrete column matrix pass through the prestressed tendon ducts and anchor grooves reserved in the concrete joint area. Tension and anchor the rolled thread steel bars in the anchor grooves within the concrete joint area. Trim the length of the rolled thread steel bars exposed outside the rolled thread nuts to half of the length of the selected metal connecting sleeve and insert them into the metal connecting sleeve. The bottom of the metal connecting sleeve is closely attached to the rolled thread nuts; insert another section of rolled thread steel bar into the above-mentioned metal connecting sleeve for lapping. The length of the other section of rolled thread steel bar shall not be less than the sum of the heights of the concrete column matrix and the concrete joint area; grout the prestressed tendon ducts within the concrete joint area and the anchor grooves at the top of the concrete column matrix at its lower end. Step 5: Hoist another printed concrete column matrix and connect it to the above-mentioned concrete joint area, so that the rolled thread steel bars exposed from the concrete joint area pass through the prestressed tendon ducts and anchor grooves reserved in the concrete column matrix. Tension and anchor the rolled thread steel bars in the anchor grooves at the top of the concrete column matrix, and grout the prestressed tendon ducts within the concrete column matrix and the anchor grooves at the top of the joint area at its lower end. Step 6: Repeat the construction processes of Step 4 and Step 5 until the building is assembled to the top, and grout the anchor grooves at the top of the top-layer concrete column matrix.

7. The construction method of an assembled bonded post-tensioned 3D printed concrete column according to claim 6, characterized in that: In the second step, the concrete joint area is cast-in-place prefabricated or 3D printed prefabricated.

Images